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\ No newline at end of file diff --git a/vendor/serde/Cargo.toml b/vendor/serde/Cargo.toml new file mode 100644 index 000000000..9893bb79d --- /dev/null +++ b/vendor/serde/Cargo.toml @@ -0,0 +1,64 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +rust-version = "1.13" +name = "serde" +version = "1.0.140" +authors = [ + "Erick Tryzelaar <erick.tryzelaar@gmail.com>", + "David Tolnay <dtolnay@gmail.com>", +] +build = "build.rs" +include = [ + "build.rs", + "src/**/*.rs", + "crates-io.md", + "README.md", + "LICENSE-APACHE", + "LICENSE-MIT", +] +description = "A generic serialization/deserialization framework" +homepage = "https://serde.rs" +documentation = "https://docs.serde.rs/serde/" +readme = "crates-io.md" +keywords = [ + "serde", + "serialization", + "no_std", +] +categories = ["encoding"] +license = "MIT OR Apache-2.0" +repository = "https://github.com/serde-rs/serde" + +[package.metadata.playground] +features = [ + "derive", + "rc", +] + +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] + +[dependencies.serde_derive] +version = "=1.0.140" +optional = true + +[dev-dependencies.serde_derive] +version = "1.0" + +[features] +alloc = [] +default = ["std"] +derive = ["serde_derive"] +rc = [] +std = [] +unstable = [] diff --git a/vendor/serde/LICENSE-APACHE b/vendor/serde/LICENSE-APACHE new file mode 100644 index 000000000..16fe87b06 --- /dev/null +++ b/vendor/serde/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/vendor/serde/README.md b/vendor/serde/README.md new file mode 100644 index 000000000..79409a3fc --- /dev/null +++ b/vendor/serde/README.md @@ -0,0 +1,114 @@ +# Serde   [![Build Status]][actions] [![Latest Version]][crates.io] [![serde: rustc 1.13+]][Rust 1.13] [![serde_derive: rustc 1.31+]][Rust 1.31] + +[Build Status]: https://img.shields.io/github/workflow/status/serde-rs/serde/CI/master +[actions]: https://github.com/serde-rs/serde/actions?query=branch%3Amaster +[Latest Version]: https://img.shields.io/crates/v/serde.svg +[crates.io]: https://crates.io/crates/serde +[serde: rustc 1.13+]: https://img.shields.io/badge/serde-rustc_1.13+-lightgray.svg +[serde_derive: rustc 1.31+]: https://img.shields.io/badge/serde_derive-rustc_1.31+-lightgray.svg +[Rust 1.13]: https://blog.rust-lang.org/2016/11/10/Rust-1.13.html +[Rust 1.31]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html + +**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.** + +--- + +You may be looking for: + +- [An overview of Serde](https://serde.rs/) +- [Data formats supported by Serde](https://serde.rs/#data-formats) +- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html) +- [Examples](https://serde.rs/examples.html) +- [API documentation](https://docs.serde.rs/serde/) +- [Release notes](https://github.com/serde-rs/serde/releases) + +## Serde in action + +<details> +<summary> +Click to show Cargo.toml. +<a href="https://play.rust-lang.org/?edition=2018&gist=72755f28f99afc95e01d63174b28c1f5" target="_blank">Run this code in the playground.</a> +</summary> + +```toml +[dependencies] + +# The core APIs, including the Serialize and Deserialize traits. Always +# required when using Serde. The "derive" feature is only required when +# using #[derive(Serialize, Deserialize)] to make Serde work with structs +# and enums defined in your crate. +serde = { version = "1.0", features = ["derive"] } + +# Each data format lives in its own crate; the sample code below uses JSON +# but you may be using a different one. +serde_json = "1.0" +``` + +</details> +<p></p> + +```rust +use serde::{Serialize, Deserialize}; + +#[derive(Serialize, Deserialize, Debug)] +struct Point { + x: i32, + y: i32, +} + +fn main() { + let point = Point { x: 1, y: 2 }; + + // Convert the Point to a JSON string. + let serialized = serde_json::to_string(&point).unwrap(); + + // Prints serialized = {"x":1,"y":2} + println!("serialized = {}", serialized); + + // Convert the JSON string back to a Point. + let deserialized: Point = serde_json::from_str(&serialized).unwrap(); + + // Prints deserialized = Point { x: 1, y: 2 } + println!("deserialized = {:?}", deserialized); +} +``` + +## Getting help + +Serde is one of the most widely used Rust libraries so any place that Rustaceans +congregate will be able to help you out. For chat, consider trying the +[#rust-questions] or [#rust-beginners] channels of the unofficial community +Discord (invite: <https://discord.gg/rust-lang-community>), the [#rust-usage] or +[#beginners] channels of the official Rust Project Discord (invite: +<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For +asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the +[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust +[Discourse forum][discourse]. It's acceptable to file a support issue in this +repo but they tend not to get as many eyes as any of the above and may get +closed without a response after some time. + +[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513 +[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281 +[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848 +[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612 +[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general +[stackoverflow]: https://stackoverflow.com/questions/tagged/rust +[/r/rust]: https://www.reddit.com/r/rust +[discourse]: https://users.rust-lang.org + +<br> + +#### License + +<sup> +Licensed under either of <a href="LICENSE-APACHE">Apache License, Version +2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option. +</sup> + +<br> + +<sub> +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in Serde by you, as defined in the Apache-2.0 license, shall be +dual licensed as above, without any additional terms or conditions. +</sub> diff --git a/vendor/serde/build.rs b/vendor/serde/build.rs new file mode 100644 index 000000000..a1103b520 --- /dev/null +++ b/vendor/serde/build.rs @@ -0,0 +1,140 @@ +use std::env; +use std::process::Command; +use std::str::{self, FromStr}; + +// The rustc-cfg strings below are *not* public API. Please let us know by +// opening a GitHub issue if your build environment requires some way to enable +// these cfgs other than by executing our build script. +fn main() { + let minor = match rustc_minor_version() { + Some(minor) => minor, + None => return, + }; + + let target = env::var("TARGET").unwrap(); + let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten"; + + // std::collections::Bound was stabilized in Rust 1.17 + // but it was moved to core::ops later in Rust 1.26: + // https://doc.rust-lang.org/core/ops/enum.Bound.html + if minor < 26 { + println!("cargo:rustc-cfg=no_ops_bound"); + if minor < 17 { + println!("cargo:rustc-cfg=no_collections_bound"); + } + } + + // core::cmp::Reverse stabilized in Rust 1.19: + // https://doc.rust-lang.org/stable/core/cmp/struct.Reverse.html + if minor < 19 { + println!("cargo:rustc-cfg=no_core_reverse"); + } + + // CString::into_boxed_c_str and PathBuf::into_boxed_path stabilized in Rust 1.20: + // https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str + // https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.into_boxed_path + if minor < 20 { + println!("cargo:rustc-cfg=no_de_boxed_c_str"); + println!("cargo:rustc-cfg=no_de_boxed_path"); + } + + // From<Box<T>> for Rc<T> / Arc<T> stabilized in Rust 1.21: + // https://doc.rust-lang.org/std/rc/struct.Rc.html#impl-From<Box<T>> + // https://doc.rust-lang.org/std/sync/struct.Arc.html#impl-From<Box<T>> + if minor < 21 { + println!("cargo:rustc-cfg=no_de_rc_dst"); + } + + // Duration available in core since Rust 1.25: + // https://blog.rust-lang.org/2018/03/29/Rust-1.25.html#library-stabilizations + if minor < 25 { + println!("cargo:rustc-cfg=no_core_duration"); + } + + // 128-bit integers stabilized in Rust 1.26: + // https://blog.rust-lang.org/2018/05/10/Rust-1.26.html + // + // Disabled on Emscripten targets before Rust 1.40 since + // Emscripten did not support 128-bit integers until Rust 1.40 + // (https://github.com/rust-lang/rust/pull/65251) + if minor < 26 || emscripten && minor < 40 { + println!("cargo:rustc-cfg=no_integer128"); + } + + // Inclusive ranges methods stabilized in Rust 1.27: + // https://github.com/rust-lang/rust/pull/50758 + // Also Iterator::try_for_each: + // https://blog.rust-lang.org/2018/06/21/Rust-1.27.html#library-stabilizations + if minor < 27 { + println!("cargo:rustc-cfg=no_range_inclusive"); + println!("cargo:rustc-cfg=no_iterator_try_fold"); + } + + // Non-zero integers stabilized in Rust 1.28: + // https://blog.rust-lang.org/2018/08/02/Rust-1.28.html#library-stabilizations + if minor < 28 { + println!("cargo:rustc-cfg=no_num_nonzero"); + } + + // Current minimum supported version of serde_derive crate is Rust 1.31. + if minor < 31 { + println!("cargo:rustc-cfg=no_serde_derive"); + } + + // TryFrom, Atomic types, non-zero signed integers, and SystemTime::checked_add + // stabilized in Rust 1.34: + // https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#tryfrom-and-tryinto + // https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#library-stabilizations + if minor < 34 { + println!("cargo:rustc-cfg=no_core_try_from"); + println!("cargo:rustc-cfg=no_num_nonzero_signed"); + println!("cargo:rustc-cfg=no_systemtime_checked_add"); + } + + // Whitelist of archs that support std::sync::atomic module. Ideally we + // would use #[cfg(target_has_atomic = "...")] but it is not stable yet. + // Instead this is based on rustc's compiler/rustc_target/src/spec/*.rs. + let has_atomic64 = target.starts_with("x86_64") + || target.starts_with("i686") + || target.starts_with("aarch64") + || target.starts_with("powerpc64") + || target.starts_with("sparc64") + || target.starts_with("mips64el") + || target.starts_with("riscv64"); + let has_atomic32 = has_atomic64 || emscripten; + if minor < 34 || !has_atomic64 { + println!("cargo:rustc-cfg=no_std_atomic64"); + } + if minor < 34 || !has_atomic32 { + println!("cargo:rustc-cfg=no_std_atomic"); + } +} + +fn rustc_minor_version() -> Option<u32> { + let rustc = match env::var_os("RUSTC") { + Some(rustc) => rustc, + None => return None, + }; + + let output = match Command::new(rustc).arg("--version").output() { + Ok(output) => output, + Err(_) => return None, + }; + + let version = match str::from_utf8(&output.stdout) { + Ok(version) => version, + Err(_) => return None, + }; + + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + + let next = match pieces.next() { + Some(next) => next, + None => return None, + }; + + u32::from_str(next).ok() +} diff --git a/vendor/serde/crates-io.md b/vendor/serde/crates-io.md new file mode 100644 index 000000000..b57bc5fd0 --- /dev/null +++ b/vendor/serde/crates-io.md @@ -0,0 +1,65 @@ +<!-- Serde readme rendered on crates.io --> + +**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.** + +--- + +You may be looking for: + +- [An overview of Serde](https://serde.rs/) +- [Data formats supported by Serde](https://serde.rs/#data-formats) +- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html) +- [Examples](https://serde.rs/examples.html) +- [API documentation](https://docs.serde.rs/serde/) +- [Release notes](https://github.com/serde-rs/serde/releases) + +## Serde in action + +```rust +use serde::{Serialize, Deserialize}; + +#[derive(Serialize, Deserialize, Debug)] +struct Point { + x: i32, + y: i32, +} + +fn main() { + let point = Point { x: 1, y: 2 }; + + // Convert the Point to a JSON string. + let serialized = serde_json::to_string(&point).unwrap(); + + // Prints serialized = {"x":1,"y":2} + println!("serialized = {}", serialized); + + // Convert the JSON string back to a Point. + let deserialized: Point = serde_json::from_str(&serialized).unwrap(); + + // Prints deserialized = Point { x: 1, y: 2 } + println!("deserialized = {:?}", deserialized); +} +``` + +## Getting help + +Serde is one of the most widely used Rust libraries so any place that Rustaceans +congregate will be able to help you out. For chat, consider trying the +[#rust-questions] or [#rust-beginners] channels of the unofficial community +Discord (invite: <https://discord.gg/rust-lang-community>, the [#rust-usage] or +[#beginners] channels of the official Rust Project Discord (invite: +<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For +asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the +[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust +[Discourse forum][discourse]. It's acceptable to file a support issue in this +repo but they tend not to get as many eyes as any of the above and may get +closed without a response after some time. + +[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513 +[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281 +[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848 +[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612 +[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general +[stackoverflow]: https://stackoverflow.com/questions/tagged/rust +[/r/rust]: https://www.reddit.com/r/rust +[discourse]: https://users.rust-lang.org diff --git a/vendor/serde/src/de/format.rs b/vendor/serde/src/de/format.rs new file mode 100644 index 000000000..58ec0968d --- /dev/null +++ b/vendor/serde/src/de/format.rs @@ -0,0 +1,30 @@ +use lib::fmt::{self, Write}; +use lib::str; + +pub struct Buf<'a> { + bytes: &'a mut [u8], + offset: usize, +} + +impl<'a> Buf<'a> { + pub fn new(bytes: &'a mut [u8]) -> Self { + Buf { bytes, offset: 0 } + } + + pub fn as_str(&self) -> &str { + let slice = &self.bytes[..self.offset]; + unsafe { str::from_utf8_unchecked(slice) } + } +} + +impl<'a> Write for Buf<'a> { + fn write_str(&mut self, s: &str) -> fmt::Result { + if self.offset + s.len() > self.bytes.len() { + Err(fmt::Error) + } else { + self.bytes[self.offset..self.offset + s.len()].copy_from_slice(s.as_bytes()); + self.offset += s.len(); + Ok(()) + } + } +} diff --git a/vendor/serde/src/de/ignored_any.rs b/vendor/serde/src/de/ignored_any.rs new file mode 100644 index 000000000..1d50f5ec3 --- /dev/null +++ b/vendor/serde/src/de/ignored_any.rs @@ -0,0 +1,243 @@ +use lib::*; + +use de::{ + Deserialize, Deserializer, EnumAccess, Error, MapAccess, SeqAccess, VariantAccess, Visitor, +}; + +/// An efficient way of discarding data from a deserializer. +/// +/// Think of this like `serde_json::Value` in that it can be deserialized from +/// any type, except that it does not store any information about the data that +/// gets deserialized. +/// +/// ```edition2018 +/// use std::fmt; +/// use std::marker::PhantomData; +/// +/// use serde::de::{ +/// self, Deserialize, DeserializeSeed, Deserializer, IgnoredAny, SeqAccess, Visitor, +/// }; +/// +/// /// A seed that can be used to deserialize only the `n`th element of a sequence +/// /// while efficiently discarding elements of any type before or after index `n`. +/// /// +/// /// For example to deserialize only the element at index 3: +/// /// +/// /// ``` +/// /// NthElement::new(3).deserialize(deserializer) +/// /// ``` +/// pub struct NthElement<T> { +/// n: usize, +/// marker: PhantomData<T>, +/// } +/// +/// impl<T> NthElement<T> { +/// pub fn new(n: usize) -> Self { +/// NthElement { +/// n: n, +/// marker: PhantomData, +/// } +/// } +/// } +/// +/// impl<'de, T> Visitor<'de> for NthElement<T> +/// where +/// T: Deserialize<'de>, +/// { +/// type Value = T; +/// +/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +/// write!( +/// formatter, +/// "a sequence in which we care about element {}", +/// self.n +/// ) +/// } +/// +/// fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> +/// where +/// A: SeqAccess<'de>, +/// { +/// // Skip over the first `n` elements. +/// for i in 0..self.n { +/// // It is an error if the sequence ends before we get to element `n`. +/// if seq.next_element::<IgnoredAny>()?.is_none() { +/// return Err(de::Error::invalid_length(i, &self)); +/// } +/// } +/// +/// // Deserialize the one we care about. +/// let nth = match seq.next_element()? { +/// Some(nth) => nth, +/// None => { +/// return Err(de::Error::invalid_length(self.n, &self)); +/// } +/// }; +/// +/// // Skip over any remaining elements in the sequence after `n`. +/// while let Some(IgnoredAny) = seq.next_element()? { +/// // ignore +/// } +/// +/// Ok(nth) +/// } +/// } +/// +/// impl<'de, T> DeserializeSeed<'de> for NthElement<T> +/// where +/// T: Deserialize<'de>, +/// { +/// type Value = T; +/// +/// fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> +/// where +/// D: Deserializer<'de>, +/// { +/// deserializer.deserialize_seq(self) +/// } +/// } +/// +/// # fn example<'de, D>(deserializer: D) -> Result<(), D::Error> +/// # where +/// # D: Deserializer<'de>, +/// # { +/// // Deserialize only the sequence element at index 3 from this deserializer. +/// // The element at index 3 is required to be a string. Elements before and +/// // after index 3 are allowed to be of any type. +/// let s: String = NthElement::new(3).deserialize(deserializer)?; +/// # Ok(()) +/// # } +/// ``` +#[derive(Copy, Clone, Debug, Default)] +pub struct IgnoredAny; + +impl<'de> Visitor<'de> for IgnoredAny { + type Value = IgnoredAny; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("anything at all") + } + + #[inline] + fn visit_bool<E>(self, x: bool) -> Result<Self::Value, E> { + let _ = x; + Ok(IgnoredAny) + } + + #[inline] + fn visit_i64<E>(self, x: i64) -> Result<Self::Value, E> { + let _ = x; + Ok(IgnoredAny) + } + + serde_if_integer128! { + #[inline] + fn visit_i128<E>(self, x: i128) -> Result<Self::Value, E> { + let _ = x; + Ok(IgnoredAny) + } + } + + #[inline] + fn visit_u64<E>(self, x: u64) -> Result<Self::Value, E> { + let _ = x; + Ok(IgnoredAny) + } + + serde_if_integer128! { + #[inline] + fn visit_u128<E>(self, x: u128) -> Result<Self::Value, E> { + let _ = x; + Ok(IgnoredAny) + } + } + + #[inline] + fn visit_f64<E>(self, x: f64) -> Result<Self::Value, E> { + let _ = x; + Ok(IgnoredAny) + } + + #[inline] + fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> + where + E: Error, + { + let _ = s; + Ok(IgnoredAny) + } + + #[inline] + fn visit_none<E>(self) -> Result<Self::Value, E> { + Ok(IgnoredAny) + } + + #[inline] + fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + IgnoredAny::deserialize(deserializer) + } + + #[inline] + fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + IgnoredAny::deserialize(deserializer) + } + + #[inline] + fn visit_unit<E>(self) -> Result<Self::Value, E> { + Ok(IgnoredAny) + } + + #[inline] + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + while let Some(IgnoredAny) = try!(seq.next_element()) { + // Gobble + } + Ok(IgnoredAny) + } + + #[inline] + fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + while let Some((IgnoredAny, IgnoredAny)) = try!(map.next_entry()) { + // Gobble + } + Ok(IgnoredAny) + } + + #[inline] + fn visit_bytes<E>(self, bytes: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + let _ = bytes; + Ok(IgnoredAny) + } + + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + data.variant::<IgnoredAny>()?.1.newtype_variant() + } +} + +impl<'de> Deserialize<'de> for IgnoredAny { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<IgnoredAny, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_ignored_any(IgnoredAny) + } +} diff --git a/vendor/serde/src/de/impls.rs b/vendor/serde/src/de/impls.rs new file mode 100644 index 000000000..c2a56b4fc --- /dev/null +++ b/vendor/serde/src/de/impls.rs @@ -0,0 +1,2725 @@ +use lib::*; + +use de::{ + Deserialize, Deserializer, EnumAccess, Error, SeqAccess, Unexpected, VariantAccess, Visitor, +}; + +#[cfg(any(feature = "std", feature = "alloc", not(no_core_duration)))] +use de::MapAccess; + +use seed::InPlaceSeed; + +#[cfg(any(feature = "std", feature = "alloc"))] +use __private::size_hint; + +//////////////////////////////////////////////////////////////////////////////// + +struct UnitVisitor; + +impl<'de> Visitor<'de> for UnitVisitor { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("unit") + } + + fn visit_unit<E>(self) -> Result<Self::Value, E> + where + E: Error, + { + Ok(()) + } +} + +impl<'de> Deserialize<'de> for () { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_unit(UnitVisitor) + } +} + +#[cfg(feature = "unstable")] +impl<'de> Deserialize<'de> for ! { + fn deserialize<D>(_deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + Err(Error::custom("cannot deserialize `!`")) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +struct BoolVisitor; + +impl<'de> Visitor<'de> for BoolVisitor { + type Value = bool; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a boolean") + } + + fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v) + } +} + +impl<'de> Deserialize<'de> for bool { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_bool(BoolVisitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! impl_deserialize_num { + ($primitive:ident, $nonzero:ident $(cfg($($cfg:tt)*))*, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => { + impl_deserialize_num!($primitive, $deserialize $($method!($($val : $visit)*);)*); + + #[cfg(all(not(no_num_nonzero), $($($cfg)*)*))] + impl<'de> Deserialize<'de> for num::$nonzero { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct NonZeroVisitor; + + impl<'de> Visitor<'de> for NonZeroVisitor { + type Value = num::$nonzero; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(concat!("a nonzero ", stringify!($primitive))) + } + + $($($method!(nonzero $primitive $val : $visit);)*)* + } + + deserializer.$deserialize(NonZeroVisitor) + } + } + }; + + ($primitive:ident, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => { + impl<'de> Deserialize<'de> for $primitive { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct PrimitiveVisitor; + + impl<'de> Visitor<'de> for PrimitiveVisitor { + type Value = $primitive; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(stringify!($primitive)) + } + + $($($method!($val : $visit);)*)* + } + + deserializer.$deserialize(PrimitiveVisitor) + } + } + }; +} + +macro_rules! num_self { + ($ty:ident : $visit:ident) => { + #[inline] + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v) + } + }; + + (nonzero $primitive:ident $ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if let Some(nonzero) = Self::Value::new(v) { + Ok(nonzero) + } else { + Err(Error::invalid_value(Unexpected::Unsigned(0), &self)) + } + } + }; +} + +macro_rules! num_as_self { + ($ty:ident : $visit:ident) => { + #[inline] + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v as Self::Value) + } + }; + + (nonzero $primitive:ident $ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if let Some(nonzero) = Self::Value::new(v as $primitive) { + Ok(nonzero) + } else { + Err(Error::invalid_value(Unexpected::Unsigned(0), &self)) + } + } + }; +} + +macro_rules! int_to_int { + ($ty:ident : $visit:ident) => { + #[inline] + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if Self::Value::min_value() as i64 <= v as i64 + && v as i64 <= Self::Value::max_value() as i64 + { + Ok(v as Self::Value) + } else { + Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) + } + } + }; + + (nonzero $primitive:ident $ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if $primitive::min_value() as i64 <= v as i64 + && v as i64 <= $primitive::max_value() as i64 + { + if let Some(nonzero) = Self::Value::new(v as $primitive) { + return Ok(nonzero); + } + } + Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) + } + }; +} + +macro_rules! int_to_uint { + ($ty:ident : $visit:ident) => { + #[inline] + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if 0 <= v && v as u64 <= Self::Value::max_value() as u64 { + Ok(v as Self::Value) + } else { + Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) + } + } + }; + + (nonzero $primitive:ident $ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if 0 < v && v as u64 <= $primitive::max_value() as u64 { + if let Some(nonzero) = Self::Value::new(v as $primitive) { + return Ok(nonzero); + } + } + Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) + } + }; +} + +macro_rules! uint_to_self { + ($ty:ident : $visit:ident) => { + #[inline] + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if v as u64 <= Self::Value::max_value() as u64 { + Ok(v as Self::Value) + } else { + Err(Error::invalid_value(Unexpected::Unsigned(v as u64), &self)) + } + } + }; + + (nonzero $primitive:ident $ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if v as u64 <= $primitive::max_value() as u64 { + if let Some(nonzero) = Self::Value::new(v as $primitive) { + return Ok(nonzero); + } + } + Err(Error::invalid_value(Unexpected::Unsigned(v as u64), &self)) + } + }; +} + +impl_deserialize_num! { + i8, NonZeroI8 cfg(not(no_num_nonzero_signed)), deserialize_i8 + num_self!(i8:visit_i8); + int_to_int!(i16:visit_i16 i32:visit_i32 i64:visit_i64); + uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + i16, NonZeroI16 cfg(not(no_num_nonzero_signed)), deserialize_i16 + num_self!(i16:visit_i16); + num_as_self!(i8:visit_i8); + int_to_int!(i32:visit_i32 i64:visit_i64); + uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + i32, NonZeroI32 cfg(not(no_num_nonzero_signed)), deserialize_i32 + num_self!(i32:visit_i32); + num_as_self!(i8:visit_i8 i16:visit_i16); + int_to_int!(i64:visit_i64); + uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + i64, NonZeroI64 cfg(not(no_num_nonzero_signed)), deserialize_i64 + num_self!(i64:visit_i64); + num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32); + uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + isize, NonZeroIsize cfg(not(no_num_nonzero_signed)), deserialize_i64 + num_as_self!(i8:visit_i8 i16:visit_i16); + int_to_int!(i32:visit_i32 i64:visit_i64); + uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + u8, NonZeroU8, deserialize_u8 + num_self!(u8:visit_u8); + int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + uint_to_self!(u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + u16, NonZeroU16, deserialize_u16 + num_self!(u16:visit_u16); + num_as_self!(u8:visit_u8); + int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + uint_to_self!(u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + u32, NonZeroU32, deserialize_u32 + num_self!(u32:visit_u32); + num_as_self!(u8:visit_u8 u16:visit_u16); + int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + uint_to_self!(u64:visit_u64); +} + +impl_deserialize_num! { + u64, NonZeroU64, deserialize_u64 + num_self!(u64:visit_u64); + num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32); + int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); +} + +impl_deserialize_num! { + usize, NonZeroUsize, deserialize_u64 + num_as_self!(u8:visit_u8 u16:visit_u16); + int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + uint_to_self!(u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + f32, deserialize_f32 + num_self!(f32:visit_f32); + num_as_self!(f64:visit_f64); + num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +impl_deserialize_num! { + f64, deserialize_f64 + num_self!(f64:visit_f64); + num_as_self!(f32:visit_f32); + num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); +} + +serde_if_integer128! { + macro_rules! num_128 { + ($ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if v as i128 >= Self::Value::min_value() as i128 + && v as u128 <= Self::Value::max_value() as u128 + { + Ok(v as Self::Value) + } else { + Err(Error::invalid_value( + Unexpected::Other(stringify!($ty)), + &self, + )) + } + } + }; + + (nonzero $primitive:ident $ty:ident : $visit:ident) => { + fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> + where + E: Error, + { + if v as i128 >= $primitive::min_value() as i128 + && v as u128 <= $primitive::max_value() as u128 + { + if let Some(nonzero) = Self::Value::new(v as $primitive) { + Ok(nonzero) + } else { + Err(Error::invalid_value(Unexpected::Unsigned(0), &self)) + } + } else { + Err(Error::invalid_value( + Unexpected::Other(stringify!($ty)), + &self, + )) + } + } + }; + } + + impl_deserialize_num! { + i128, NonZeroI128 cfg(not(no_num_nonzero_signed)), deserialize_i128 + num_self!(i128:visit_i128); + num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); + num_128!(u128:visit_u128); + } + + impl_deserialize_num! { + u128, NonZeroU128, deserialize_u128 + num_self!(u128:visit_u128); + num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); + int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); + num_128!(i128:visit_i128); + } +} + +//////////////////////////////////////////////////////////////////////////////// + +struct CharVisitor; + +impl<'de> Visitor<'de> for CharVisitor { + type Value = char; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a character") + } + + #[inline] + fn visit_char<E>(self, v: char) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v) + } + + #[inline] + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + let mut iter = v.chars(); + match (iter.next(), iter.next()) { + (Some(c), None) => Ok(c), + _ => Err(Error::invalid_value(Unexpected::Str(v), &self)), + } + } +} + +impl<'de> Deserialize<'de> for char { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_char(CharVisitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +struct StringVisitor; +#[cfg(any(feature = "std", feature = "alloc"))] +struct StringInPlaceVisitor<'a>(&'a mut String); + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de> Visitor<'de> for StringVisitor { + type Value = String; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a string") + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v.to_owned()) + } + + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v) + } + + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match str::from_utf8(v) { + Ok(s) => Ok(s.to_owned()), + Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)), + } + } + + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + match String::from_utf8(v) { + Ok(s) => Ok(s), + Err(e) => Err(Error::invalid_value( + Unexpected::Bytes(&e.into_bytes()), + &self, + )), + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de> Visitor<'de> for StringInPlaceVisitor<'a> { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a string") + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + self.0.clear(); + self.0.push_str(v); + Ok(()) + } + + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + *self.0 = v; + Ok(()) + } + + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match str::from_utf8(v) { + Ok(s) => { + self.0.clear(); + self.0.push_str(s); + Ok(()) + } + Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)), + } + } + + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + match String::from_utf8(v) { + Ok(s) => { + *self.0 = s; + Ok(()) + } + Err(e) => Err(Error::invalid_value( + Unexpected::Bytes(&e.into_bytes()), + &self, + )), + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de> Deserialize<'de> for String { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_string(StringVisitor) + } + + fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_string(StringInPlaceVisitor(place)) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +struct StrVisitor; + +impl<'a> Visitor<'a> for StrVisitor { + type Value = &'a str; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a borrowed string") + } + + fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v) // so easy + } + + fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> + where + E: Error, + { + str::from_utf8(v).map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self)) + } +} + +impl<'de: 'a, 'a> Deserialize<'de> for &'a str { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_str(StrVisitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +struct BytesVisitor; + +impl<'a> Visitor<'a> for BytesVisitor { + type Value = &'a [u8]; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a borrowed byte array") + } + + fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v) + } + + fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v.as_bytes()) + } +} + +impl<'de: 'a, 'a> Deserialize<'de> for &'a [u8] { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_bytes(BytesVisitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +struct CStringVisitor; + +#[cfg(feature = "std")] +impl<'de> Visitor<'de> for CStringVisitor { + type Value = CString; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("byte array") + } + + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let len = size_hint::cautious(seq.size_hint()); + let mut values = Vec::with_capacity(len); + + while let Some(value) = try!(seq.next_element()) { + values.push(value); + } + + CString::new(values).map_err(Error::custom) + } + + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + CString::new(v).map_err(Error::custom) + } + + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + CString::new(v).map_err(Error::custom) + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + CString::new(v).map_err(Error::custom) + } + + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + CString::new(v).map_err(Error::custom) + } +} + +#[cfg(feature = "std")] +impl<'de> Deserialize<'de> for CString { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_byte_buf(CStringVisitor) + } +} + +macro_rules! forwarded_impl { + ( + $(#[doc = $doc:tt])* + ( $($id: ident),* ), $ty: ty, $func: expr + ) => { + $(#[doc = $doc])* + impl<'de $(, $id : Deserialize<'de>,)*> Deserialize<'de> for $ty { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + Deserialize::deserialize(deserializer).map($func) + } + } + } +} + +#[cfg(all(feature = "std", not(no_de_boxed_c_str)))] +forwarded_impl!((), Box<CStr>, CString::into_boxed_c_str); + +#[cfg(not(no_core_reverse))] +forwarded_impl!((T), Reverse<T>, Reverse); + +//////////////////////////////////////////////////////////////////////////////// + +struct OptionVisitor<T> { + marker: PhantomData<T>, +} + +impl<'de, T> Visitor<'de> for OptionVisitor<T> +where + T: Deserialize<'de>, +{ + type Value = Option<T>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("option") + } + + #[inline] + fn visit_unit<E>(self) -> Result<Self::Value, E> + where + E: Error, + { + Ok(None) + } + + #[inline] + fn visit_none<E>(self) -> Result<Self::Value, E> + where + E: Error, + { + Ok(None) + } + + #[inline] + fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + T::deserialize(deserializer).map(Some) + } + + fn __private_visit_untagged_option<D>(self, deserializer: D) -> Result<Self::Value, ()> + where + D: Deserializer<'de>, + { + Ok(T::deserialize(deserializer).ok()) + } +} + +impl<'de, T> Deserialize<'de> for Option<T> +where + T: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_option(OptionVisitor { + marker: PhantomData, + }) + } + + // The Some variant's repr is opaque, so we can't play cute tricks with its + // tag to have deserialize_in_place build the content in place unconditionally. + // + // FIXME: investigate whether branching on the old value being Some to + // deserialize_in_place the value is profitable (probably data-dependent?) +} + +//////////////////////////////////////////////////////////////////////////////// + +struct PhantomDataVisitor<T: ?Sized> { + marker: PhantomData<T>, +} + +impl<'de, T: ?Sized> Visitor<'de> for PhantomDataVisitor<T> { + type Value = PhantomData<T>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("unit") + } + + #[inline] + fn visit_unit<E>(self) -> Result<Self::Value, E> + where + E: Error, + { + Ok(PhantomData) + } +} + +impl<'de, T: ?Sized> Deserialize<'de> for PhantomData<T> { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + let visitor = PhantomDataVisitor { + marker: PhantomData, + }; + deserializer.deserialize_unit_struct("PhantomData", visitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +macro_rules! seq_impl { + ( + $ty:ident < T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)* >, + $access:ident, + $clear:expr, + $with_capacity:expr, + $reserve:expr, + $insert:expr + ) => { + impl<'de, T $(, $typaram)*> Deserialize<'de> for $ty<T $(, $typaram)*> + where + T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*, + $($typaram: $bound1 $(+ $bound2)*,)* + { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct SeqVisitor<T $(, $typaram)*> { + marker: PhantomData<$ty<T $(, $typaram)*>>, + } + + impl<'de, T $(, $typaram)*> Visitor<'de> for SeqVisitor<T $(, $typaram)*> + where + T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*, + $($typaram: $bound1 $(+ $bound2)*,)* + { + type Value = $ty<T $(, $typaram)*>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a sequence") + } + + #[inline] + fn visit_seq<A>(self, mut $access: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let mut values = $with_capacity; + + while let Some(value) = try!($access.next_element()) { + $insert(&mut values, value); + } + + Ok(values) + } + } + + let visitor = SeqVisitor { marker: PhantomData }; + deserializer.deserialize_seq(visitor) + } + + fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> + where + D: Deserializer<'de>, + { + struct SeqInPlaceVisitor<'a, T: 'a $(, $typaram: 'a)*>(&'a mut $ty<T $(, $typaram)*>); + + impl<'a, 'de, T $(, $typaram)*> Visitor<'de> for SeqInPlaceVisitor<'a, T $(, $typaram)*> + where + T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*, + $($typaram: $bound1 $(+ $bound2)*,)* + { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a sequence") + } + + #[inline] + fn visit_seq<A>(mut self, mut $access: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + $clear(&mut self.0); + $reserve(&mut self.0, size_hint::cautious($access.size_hint())); + + // FIXME: try to overwrite old values here? (Vec, VecDeque, LinkedList) + while let Some(value) = try!($access.next_element()) { + $insert(&mut self.0, value); + } + + Ok(()) + } + } + + deserializer.deserialize_seq(SeqInPlaceVisitor(place)) + } + } + } +} + +// Dummy impl of reserve +#[cfg(any(feature = "std", feature = "alloc"))] +fn nop_reserve<T>(_seq: T, _n: usize) {} + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!( + BinaryHeap<T: Ord>, + seq, + BinaryHeap::clear, + BinaryHeap::with_capacity(size_hint::cautious(seq.size_hint())), + BinaryHeap::reserve, + BinaryHeap::push +); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!( + BTreeSet<T: Eq + Ord>, + seq, + BTreeSet::clear, + BTreeSet::new(), + nop_reserve, + BTreeSet::insert +); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!( + LinkedList<T>, + seq, + LinkedList::clear, + LinkedList::new(), + nop_reserve, + LinkedList::push_back +); + +#[cfg(feature = "std")] +seq_impl!( + HashSet<T: Eq + Hash, S: BuildHasher + Default>, + seq, + HashSet::clear, + HashSet::with_capacity_and_hasher(size_hint::cautious(seq.size_hint()), S::default()), + HashSet::reserve, + HashSet::insert); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!( + VecDeque<T>, + seq, + VecDeque::clear, + VecDeque::with_capacity(size_hint::cautious(seq.size_hint())), + VecDeque::reserve, + VecDeque::push_back +); + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, T> Deserialize<'de> for Vec<T> +where + T: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct VecVisitor<T> { + marker: PhantomData<T>, + } + + impl<'de, T> Visitor<'de> for VecVisitor<T> + where + T: Deserialize<'de>, + { + type Value = Vec<T>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a sequence") + } + + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let mut values = Vec::with_capacity(size_hint::cautious(seq.size_hint())); + + while let Some(value) = try!(seq.next_element()) { + values.push(value); + } + + Ok(values) + } + } + + let visitor = VecVisitor { + marker: PhantomData, + }; + deserializer.deserialize_seq(visitor) + } + + fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> + where + D: Deserializer<'de>, + { + struct VecInPlaceVisitor<'a, T: 'a>(&'a mut Vec<T>); + + impl<'a, 'de, T> Visitor<'de> for VecInPlaceVisitor<'a, T> + where + T: Deserialize<'de>, + { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a sequence") + } + + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let hint = size_hint::cautious(seq.size_hint()); + if let Some(additional) = hint.checked_sub(self.0.len()) { + self.0.reserve(additional); + } + + for i in 0..self.0.len() { + let next = { + let next_place = InPlaceSeed(&mut self.0[i]); + try!(seq.next_element_seed(next_place)) + }; + if next.is_none() { + self.0.truncate(i); + return Ok(()); + } + } + + while let Some(value) = try!(seq.next_element()) { + self.0.push(value); + } + + Ok(()) + } + } + + deserializer.deserialize_seq(VecInPlaceVisitor(place)) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +struct ArrayVisitor<A> { + marker: PhantomData<A>, +} +struct ArrayInPlaceVisitor<'a, A: 'a>(&'a mut A); + +impl<A> ArrayVisitor<A> { + fn new() -> Self { + ArrayVisitor { + marker: PhantomData, + } + } +} + +impl<'de, T> Visitor<'de> for ArrayVisitor<[T; 0]> { + type Value = [T; 0]; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("an empty array") + } + + #[inline] + fn visit_seq<A>(self, _: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + Ok([]) + } +} + +// Does not require T: Deserialize<'de>. +impl<'de, T> Deserialize<'de> for [T; 0] { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_tuple(0, ArrayVisitor::<[T; 0]>::new()) + } +} + +macro_rules! array_impls { + ($($len:expr => ($($n:tt)+))+) => { + $( + impl<'de, T> Visitor<'de> for ArrayVisitor<[T; $len]> + where + T: Deserialize<'de>, + { + type Value = [T; $len]; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(concat!("an array of length ", $len)) + } + + #[inline] + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + Ok([$( + match try!(seq.next_element()) { + Some(val) => val, + None => return Err(Error::invalid_length($n, &self)), + } + ),+]) + } + } + + impl<'a, 'de, T> Visitor<'de> for ArrayInPlaceVisitor<'a, [T; $len]> + where + T: Deserialize<'de>, + { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(concat!("an array of length ", $len)) + } + + #[inline] + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let mut fail_idx = None; + for (idx, dest) in self.0[..].iter_mut().enumerate() { + if try!(seq.next_element_seed(InPlaceSeed(dest))).is_none() { + fail_idx = Some(idx); + break; + } + } + if let Some(idx) = fail_idx { + return Err(Error::invalid_length(idx, &self)); + } + Ok(()) + } + } + + impl<'de, T> Deserialize<'de> for [T; $len] + where + T: Deserialize<'de>, + { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_tuple($len, ArrayVisitor::<[T; $len]>::new()) + } + + fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_tuple($len, ArrayInPlaceVisitor(place)) + } + } + )+ + } +} + +array_impls! { + 1 => (0) + 2 => (0 1) + 3 => (0 1 2) + 4 => (0 1 2 3) + 5 => (0 1 2 3 4) + 6 => (0 1 2 3 4 5) + 7 => (0 1 2 3 4 5 6) + 8 => (0 1 2 3 4 5 6 7) + 9 => (0 1 2 3 4 5 6 7 8) + 10 => (0 1 2 3 4 5 6 7 8 9) + 11 => (0 1 2 3 4 5 6 7 8 9 10) + 12 => (0 1 2 3 4 5 6 7 8 9 10 11) + 13 => (0 1 2 3 4 5 6 7 8 9 10 11 12) + 14 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13) + 15 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14) + 16 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15) + 17 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16) + 18 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17) + 19 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18) + 20 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19) + 21 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20) + 22 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21) + 23 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22) + 24 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23) + 25 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24) + 26 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25) + 27 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26) + 28 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27) + 29 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28) + 30 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29) + 31 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30) + 32 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31) +} + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! tuple_impls { + ($($len:tt => ($($n:tt $name:ident)+))+) => { + $( + impl<'de, $($name: Deserialize<'de>),+> Deserialize<'de> for ($($name,)+) { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct TupleVisitor<$($name,)+> { + marker: PhantomData<($($name,)+)>, + } + + impl<'de, $($name: Deserialize<'de>),+> Visitor<'de> for TupleVisitor<$($name,)+> { + type Value = ($($name,)+); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(concat!("a tuple of size ", $len)) + } + + #[inline] + #[allow(non_snake_case)] + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + $( + let $name = match try!(seq.next_element()) { + Some(value) => value, + None => return Err(Error::invalid_length($n, &self)), + }; + )+ + + Ok(($($name,)+)) + } + } + + deserializer.deserialize_tuple($len, TupleVisitor { marker: PhantomData }) + } + + #[inline] + fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> + where + D: Deserializer<'de>, + { + struct TupleInPlaceVisitor<'a, $($name: 'a,)+>(&'a mut ($($name,)+)); + + impl<'a, 'de, $($name: Deserialize<'de>),+> Visitor<'de> for TupleInPlaceVisitor<'a, $($name,)+> { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(concat!("a tuple of size ", $len)) + } + + #[inline] + #[allow(non_snake_case)] + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + $( + if try!(seq.next_element_seed(InPlaceSeed(&mut (self.0).$n))).is_none() { + return Err(Error::invalid_length($n, &self)); + } + )+ + + Ok(()) + } + } + + deserializer.deserialize_tuple($len, TupleInPlaceVisitor(place)) + } + } + )+ + } +} + +tuple_impls! { + 1 => (0 T0) + 2 => (0 T0 1 T1) + 3 => (0 T0 1 T1 2 T2) + 4 => (0 T0 1 T1 2 T2 3 T3) + 5 => (0 T0 1 T1 2 T2 3 T3 4 T4) + 6 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5) + 7 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6) + 8 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7) + 9 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8) + 10 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9) + 11 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10) + 12 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11) + 13 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12) + 14 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13) + 15 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14) + 16 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14 15 T15) +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +macro_rules! map_impl { + ( + $ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)* >, + $access:ident, + $with_capacity:expr + ) => { + impl<'de, K, V $(, $typaram)*> Deserialize<'de> for $ty<K, V $(, $typaram)*> + where + K: Deserialize<'de> $(+ $kbound1 $(+ $kbound2)*)*, + V: Deserialize<'de>, + $($typaram: $bound1 $(+ $bound2)*),* + { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct MapVisitor<K, V $(, $typaram)*> { + marker: PhantomData<$ty<K, V $(, $typaram)*>>, + } + + impl<'de, K, V $(, $typaram)*> Visitor<'de> for MapVisitor<K, V $(, $typaram)*> + where + K: Deserialize<'de> $(+ $kbound1 $(+ $kbound2)*)*, + V: Deserialize<'de>, + $($typaram: $bound1 $(+ $bound2)*),* + { + type Value = $ty<K, V $(, $typaram)*>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a map") + } + + #[inline] + fn visit_map<A>(self, mut $access: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + let mut values = $with_capacity; + + while let Some((key, value)) = try!($access.next_entry()) { + values.insert(key, value); + } + + Ok(values) + } + } + + let visitor = MapVisitor { marker: PhantomData }; + deserializer.deserialize_map(visitor) + } + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +map_impl!( + BTreeMap<K: Ord, V>, + map, + BTreeMap::new()); + +#[cfg(feature = "std")] +map_impl!( + HashMap<K: Eq + Hash, V, S: BuildHasher + Default>, + map, + HashMap::with_capacity_and_hasher(size_hint::cautious(map.size_hint()), S::default())); + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +macro_rules! parse_ip_impl { + ($expecting:tt $ty:ty; $size:tt) => { + impl<'de> Deserialize<'de> for $ty { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + if deserializer.is_human_readable() { + deserializer.deserialize_str(FromStrVisitor::new($expecting)) + } else { + <[u8; $size]>::deserialize(deserializer).map(<$ty>::from) + } + } + } + }; +} + +#[cfg(feature = "std")] +macro_rules! variant_identifier { + ( + $name_kind: ident ( $($variant: ident; $bytes: expr; $index: expr),* ) + $expecting_message: expr, + $variants_name: ident + ) => { + enum $name_kind { + $( $variant ),* + } + + static $variants_name: &'static [&'static str] = &[ $( stringify!($variant) ),*]; + + impl<'de> Deserialize<'de> for $name_kind { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct KindVisitor; + + impl<'de> Visitor<'de> for KindVisitor { + type Value = $name_kind; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str($expecting_message) + } + + fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> + where + E: Error, + { + match value { + $( + $index => Ok($name_kind :: $variant), + )* + _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self),), + } + } + + fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> + where + E: Error, + { + match value { + $( + stringify!($variant) => Ok($name_kind :: $variant), + )* + _ => Err(Error::unknown_variant(value, $variants_name)), + } + } + + fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match value { + $( + $bytes => Ok($name_kind :: $variant), + )* + _ => { + match str::from_utf8(value) { + Ok(value) => Err(Error::unknown_variant(value, $variants_name)), + Err(_) => Err(Error::invalid_value(Unexpected::Bytes(value), &self)), + } + } + } + } + } + + deserializer.deserialize_identifier(KindVisitor) + } + } + } +} + +#[cfg(feature = "std")] +macro_rules! deserialize_enum { + ( + $name: ident $name_kind: ident ( $($variant: ident; $bytes: expr; $index: expr),* ) + $expecting_message: expr, + $deserializer: expr + ) => { + variant_identifier!{ + $name_kind ( $($variant; $bytes; $index),* ) + $expecting_message, + VARIANTS + } + + struct EnumVisitor; + impl<'de> Visitor<'de> for EnumVisitor { + type Value = $name; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(concat!("a ", stringify!($name))) + } + + + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + match try!(data.variant()) { + $( + ($name_kind :: $variant, v) => v.newtype_variant().map($name :: $variant), + )* + } + } + } + $deserializer.deserialize_enum(stringify!($name), VARIANTS, EnumVisitor) + } +} + +#[cfg(feature = "std")] +impl<'de> Deserialize<'de> for net::IpAddr { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + if deserializer.is_human_readable() { + deserializer.deserialize_str(FromStrVisitor::new("IP address")) + } else { + use lib::net::IpAddr; + deserialize_enum! { + IpAddr IpAddrKind (V4; b"V4"; 0, V6; b"V6"; 1) + "`V4` or `V6`", + deserializer + } + } + } +} + +#[cfg(feature = "std")] +parse_ip_impl!("IPv4 address" net::Ipv4Addr; 4); + +#[cfg(feature = "std")] +parse_ip_impl!("IPv6 address" net::Ipv6Addr; 16); + +#[cfg(feature = "std")] +macro_rules! parse_socket_impl { + ($expecting:tt $ty:ty, $new:expr) => { + impl<'de> Deserialize<'de> for $ty { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + if deserializer.is_human_readable() { + deserializer.deserialize_str(FromStrVisitor::new($expecting)) + } else { + <(_, u16)>::deserialize(deserializer).map(|(ip, port)| $new(ip, port)) + } + } + } + }; +} + +#[cfg(feature = "std")] +impl<'de> Deserialize<'de> for net::SocketAddr { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + if deserializer.is_human_readable() { + deserializer.deserialize_str(FromStrVisitor::new("socket address")) + } else { + use lib::net::SocketAddr; + deserialize_enum! { + SocketAddr SocketAddrKind (V4; b"V4"; 0, V6; b"V6"; 1) + "`V4` or `V6`", + deserializer + } + } + } +} + +#[cfg(feature = "std")] +parse_socket_impl!("IPv4 socket address" net::SocketAddrV4, net::SocketAddrV4::new); + +#[cfg(feature = "std")] +parse_socket_impl!("IPv6 socket address" net::SocketAddrV6, |ip, port| net::SocketAddrV6::new( + ip, port, 0, 0 +)); + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +struct PathVisitor; + +#[cfg(feature = "std")] +impl<'a> Visitor<'a> for PathVisitor { + type Value = &'a Path; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a borrowed path") + } + + fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(v.as_ref()) + } + + fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> + where + E: Error, + { + str::from_utf8(v) + .map(AsRef::as_ref) + .map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self)) + } +} + +#[cfg(feature = "std")] +impl<'de: 'a, 'a> Deserialize<'de> for &'a Path { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_str(PathVisitor) + } +} + +#[cfg(feature = "std")] +struct PathBufVisitor; + +#[cfg(feature = "std")] +impl<'de> Visitor<'de> for PathBufVisitor { + type Value = PathBuf; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("path string") + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(From::from(v)) + } + + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + Ok(From::from(v)) + } + + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + str::from_utf8(v) + .map(From::from) + .map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self)) + } + + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + String::from_utf8(v) + .map(From::from) + .map_err(|e| Error::invalid_value(Unexpected::Bytes(&e.into_bytes()), &self)) + } +} + +#[cfg(feature = "std")] +impl<'de> Deserialize<'de> for PathBuf { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_string(PathBufVisitor) + } +} + +#[cfg(all(feature = "std", not(no_de_boxed_path)))] +forwarded_impl!((), Box<Path>, PathBuf::into_boxed_path); + +//////////////////////////////////////////////////////////////////////////////// + +// If this were outside of the serde crate, it would just use: +// +// #[derive(Deserialize)] +// #[serde(variant_identifier)] +#[cfg(all(feature = "std", any(unix, windows)))] +variant_identifier! { + OsStringKind (Unix; b"Unix"; 0, Windows; b"Windows"; 1) + "`Unix` or `Windows`", + OSSTR_VARIANTS +} + +#[cfg(all(feature = "std", any(unix, windows)))] +struct OsStringVisitor; + +#[cfg(all(feature = "std", any(unix, windows)))] +impl<'de> Visitor<'de> for OsStringVisitor { + type Value = OsString; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("os string") + } + + #[cfg(unix)] + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + use std::os::unix::ffi::OsStringExt; + + match try!(data.variant()) { + (OsStringKind::Unix, v) => v.newtype_variant().map(OsString::from_vec), + (OsStringKind::Windows, _) => Err(Error::custom( + "cannot deserialize Windows OS string on Unix", + )), + } + } + + #[cfg(windows)] + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + use std::os::windows::ffi::OsStringExt; + + match try!(data.variant()) { + (OsStringKind::Windows, v) => v + .newtype_variant::<Vec<u16>>() + .map(|vec| OsString::from_wide(&vec)), + (OsStringKind::Unix, _) => Err(Error::custom( + "cannot deserialize Unix OS string on Windows", + )), + } + } +} + +#[cfg(all(feature = "std", any(unix, windows)))] +impl<'de> Deserialize<'de> for OsString { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_enum("OsString", OSSTR_VARIANTS, OsStringVisitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +forwarded_impl!((T), Box<T>, Box::new); + +#[cfg(any(feature = "std", feature = "alloc"))] +forwarded_impl!((T), Box<[T]>, Vec::into_boxed_slice); + +#[cfg(any(feature = "std", feature = "alloc"))] +forwarded_impl!((), Box<str>, String::into_boxed_str); + +#[cfg(all(no_de_rc_dst, feature = "rc", any(feature = "std", feature = "alloc")))] +forwarded_impl! { + /// This impl requires the [`"rc"`] Cargo feature of Serde. + /// + /// Deserializing a data structure containing `Arc` will not attempt to + /// deduplicate `Arc` references to the same data. Every deserialized `Arc` + /// will end up with a strong count of 1. + /// + /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc + (T), Arc<T>, Arc::new +} + +#[cfg(all(no_de_rc_dst, feature = "rc", any(feature = "std", feature = "alloc")))] +forwarded_impl! { + /// This impl requires the [`"rc"`] Cargo feature of Serde. + /// + /// Deserializing a data structure containing `Rc` will not attempt to + /// deduplicate `Rc` references to the same data. Every deserialized `Rc` + /// will end up with a strong count of 1. + /// + /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc + (T), Rc<T>, Rc::new +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T> +where + T: ToOwned, + T::Owned: Deserialize<'de>, +{ + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + T::Owned::deserialize(deserializer).map(Cow::Owned) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// This impl requires the [`"rc"`] Cargo feature of Serde. The resulting +/// `Weak<T>` has a reference count of 0 and cannot be upgraded. +/// +/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc +#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] +impl<'de, T: ?Sized> Deserialize<'de> for RcWeak<T> +where + T: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + try!(Option::<T>::deserialize(deserializer)); + Ok(RcWeak::new()) + } +} + +/// This impl requires the [`"rc"`] Cargo feature of Serde. The resulting +/// `Weak<T>` has a reference count of 0 and cannot be upgraded. +/// +/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc +#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] +impl<'de, T: ?Sized> Deserialize<'de> for ArcWeak<T> +where + T: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + try!(Option::<T>::deserialize(deserializer)); + Ok(ArcWeak::new()) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(all( + not(no_de_rc_dst), + feature = "rc", + any(feature = "std", feature = "alloc") +))] +macro_rules! box_forwarded_impl { + ( + $(#[doc = $doc:tt])* + $t:ident + ) => { + $(#[doc = $doc])* + impl<'de, T: ?Sized> Deserialize<'de> for $t<T> + where + Box<T>: Deserialize<'de>, + { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + Box::deserialize(deserializer).map(Into::into) + } + } + }; +} + +#[cfg(all( + not(no_de_rc_dst), + feature = "rc", + any(feature = "std", feature = "alloc") +))] +box_forwarded_impl! { + /// This impl requires the [`"rc"`] Cargo feature of Serde. + /// + /// Deserializing a data structure containing `Rc` will not attempt to + /// deduplicate `Rc` references to the same data. Every deserialized `Rc` + /// will end up with a strong count of 1. + /// + /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc + Rc +} + +#[cfg(all( + not(no_de_rc_dst), + feature = "rc", + any(feature = "std", feature = "alloc") +))] +box_forwarded_impl! { + /// This impl requires the [`"rc"`] Cargo feature of Serde. + /// + /// Deserializing a data structure containing `Arc` will not attempt to + /// deduplicate `Arc` references to the same data. Every deserialized `Arc` + /// will end up with a strong count of 1. + /// + /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc + Arc +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<'de, T> Deserialize<'de> for Cell<T> +where + T: Deserialize<'de> + Copy, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + T::deserialize(deserializer).map(Cell::new) + } +} + +forwarded_impl!((T), RefCell<T>, RefCell::new); + +#[cfg(feature = "std")] +forwarded_impl!((T), Mutex<T>, Mutex::new); + +#[cfg(feature = "std")] +forwarded_impl!((T), RwLock<T>, RwLock::new); + +//////////////////////////////////////////////////////////////////////////////// + +// This is a cleaned-up version of the impl generated by: +// +// #[derive(Deserialize)] +// #[serde(deny_unknown_fields)] +// struct Duration { +// secs: u64, +// nanos: u32, +// } +#[cfg(any(feature = "std", not(no_core_duration)))] +impl<'de> Deserialize<'de> for Duration { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + // If this were outside of the serde crate, it would just use: + // + // #[derive(Deserialize)] + // #[serde(field_identifier, rename_all = "lowercase")] + enum Field { + Secs, + Nanos, + } + + impl<'de> Deserialize<'de> for Field { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> Visitor<'de> for FieldVisitor { + type Value = Field; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("`secs` or `nanos`") + } + + fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> + where + E: Error, + { + match value { + "secs" => Ok(Field::Secs), + "nanos" => Ok(Field::Nanos), + _ => Err(Error::unknown_field(value, FIELDS)), + } + } + + fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match value { + b"secs" => Ok(Field::Secs), + b"nanos" => Ok(Field::Nanos), + _ => { + let value = ::__private::from_utf8_lossy(value); + Err(Error::unknown_field(&*value, FIELDS)) + } + } + } + } + + deserializer.deserialize_identifier(FieldVisitor) + } + } + + fn check_overflow<E>(secs: u64, nanos: u32) -> Result<(), E> + where + E: Error, + { + static NANOS_PER_SEC: u32 = 1_000_000_000; + match secs.checked_add((nanos / NANOS_PER_SEC) as u64) { + Some(_) => Ok(()), + None => Err(E::custom("overflow deserializing Duration")), + } + } + + struct DurationVisitor; + + impl<'de> Visitor<'de> for DurationVisitor { + type Value = Duration; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("struct Duration") + } + + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let secs: u64 = match try!(seq.next_element()) { + Some(value) => value, + None => { + return Err(Error::invalid_length(0, &self)); + } + }; + let nanos: u32 = match try!(seq.next_element()) { + Some(value) => value, + None => { + return Err(Error::invalid_length(1, &self)); + } + }; + try!(check_overflow(secs, nanos)); + Ok(Duration::new(secs, nanos)) + } + + fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + let mut secs: Option<u64> = None; + let mut nanos: Option<u32> = None; + while let Some(key) = try!(map.next_key()) { + match key { + Field::Secs => { + if secs.is_some() { + return Err(<A::Error as Error>::duplicate_field("secs")); + } + secs = Some(try!(map.next_value())); + } + Field::Nanos => { + if nanos.is_some() { + return Err(<A::Error as Error>::duplicate_field("nanos")); + } + nanos = Some(try!(map.next_value())); + } + } + } + let secs = match secs { + Some(secs) => secs, + None => return Err(<A::Error as Error>::missing_field("secs")), + }; + let nanos = match nanos { + Some(nanos) => nanos, + None => return Err(<A::Error as Error>::missing_field("nanos")), + }; + try!(check_overflow(secs, nanos)); + Ok(Duration::new(secs, nanos)) + } + } + + const FIELDS: &'static [&'static str] = &["secs", "nanos"]; + deserializer.deserialize_struct("Duration", FIELDS, DurationVisitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +impl<'de> Deserialize<'de> for SystemTime { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + // Reuse duration + enum Field { + Secs, + Nanos, + } + + impl<'de> Deserialize<'de> for Field { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> Visitor<'de> for FieldVisitor { + type Value = Field; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("`secs_since_epoch` or `nanos_since_epoch`") + } + + fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> + where + E: Error, + { + match value { + "secs_since_epoch" => Ok(Field::Secs), + "nanos_since_epoch" => Ok(Field::Nanos), + _ => Err(Error::unknown_field(value, FIELDS)), + } + } + + fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match value { + b"secs_since_epoch" => Ok(Field::Secs), + b"nanos_since_epoch" => Ok(Field::Nanos), + _ => { + let value = String::from_utf8_lossy(value); + Err(Error::unknown_field(&value, FIELDS)) + } + } + } + } + + deserializer.deserialize_identifier(FieldVisitor) + } + } + + fn check_overflow<E>(secs: u64, nanos: u32) -> Result<(), E> + where + E: Error, + { + static NANOS_PER_SEC: u32 = 1_000_000_000; + match secs.checked_add((nanos / NANOS_PER_SEC) as u64) { + Some(_) => Ok(()), + None => Err(E::custom("overflow deserializing SystemTime epoch offset")), + } + } + + struct DurationVisitor; + + impl<'de> Visitor<'de> for DurationVisitor { + type Value = Duration; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("struct SystemTime") + } + + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let secs: u64 = match try!(seq.next_element()) { + Some(value) => value, + None => { + return Err(Error::invalid_length(0, &self)); + } + }; + let nanos: u32 = match try!(seq.next_element()) { + Some(value) => value, + None => { + return Err(Error::invalid_length(1, &self)); + } + }; + try!(check_overflow(secs, nanos)); + Ok(Duration::new(secs, nanos)) + } + + fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + let mut secs: Option<u64> = None; + let mut nanos: Option<u32> = None; + while let Some(key) = try!(map.next_key()) { + match key { + Field::Secs => { + if secs.is_some() { + return Err(<A::Error as Error>::duplicate_field( + "secs_since_epoch", + )); + } + secs = Some(try!(map.next_value())); + } + Field::Nanos => { + if nanos.is_some() { + return Err(<A::Error as Error>::duplicate_field( + "nanos_since_epoch", + )); + } + nanos = Some(try!(map.next_value())); + } + } + } + let secs = match secs { + Some(secs) => secs, + None => return Err(<A::Error as Error>::missing_field("secs_since_epoch")), + }; + let nanos = match nanos { + Some(nanos) => nanos, + None => return Err(<A::Error as Error>::missing_field("nanos_since_epoch")), + }; + try!(check_overflow(secs, nanos)); + Ok(Duration::new(secs, nanos)) + } + } + + const FIELDS: &'static [&'static str] = &["secs_since_epoch", "nanos_since_epoch"]; + let duration = try!(deserializer.deserialize_struct("SystemTime", FIELDS, DurationVisitor)); + #[cfg(not(no_systemtime_checked_add))] + let ret = UNIX_EPOCH + .checked_add(duration) + .ok_or_else(|| D::Error::custom("overflow deserializing SystemTime")); + #[cfg(no_systemtime_checked_add)] + let ret = Ok(UNIX_EPOCH + duration); + ret + } +} + +//////////////////////////////////////////////////////////////////////////////// + +// Similar to: +// +// #[derive(Deserialize)] +// #[serde(deny_unknown_fields)] +// struct Range { +// start: u64, +// end: u32, +// } +impl<'de, Idx> Deserialize<'de> for Range<Idx> +where + Idx: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + let (start, end) = deserializer.deserialize_struct( + "Range", + range::FIELDS, + range::RangeVisitor { + expecting: "struct Range", + phantom: PhantomData, + }, + )?; + Ok(start..end) + } +} + +#[cfg(not(no_range_inclusive))] +impl<'de, Idx> Deserialize<'de> for RangeInclusive<Idx> +where + Idx: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + let (start, end) = deserializer.deserialize_struct( + "RangeInclusive", + range::FIELDS, + range::RangeVisitor { + expecting: "struct RangeInclusive", + phantom: PhantomData, + }, + )?; + Ok(RangeInclusive::new(start, end)) + } +} + +mod range { + use lib::*; + + use de::{Deserialize, Deserializer, Error, MapAccess, SeqAccess, Visitor}; + + pub const FIELDS: &'static [&'static str] = &["start", "end"]; + + // If this were outside of the serde crate, it would just use: + // + // #[derive(Deserialize)] + // #[serde(field_identifier, rename_all = "lowercase")] + enum Field { + Start, + End, + } + + impl<'de> Deserialize<'de> for Field { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> Visitor<'de> for FieldVisitor { + type Value = Field; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("`start` or `end`") + } + + fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> + where + E: Error, + { + match value { + "start" => Ok(Field::Start), + "end" => Ok(Field::End), + _ => Err(Error::unknown_field(value, FIELDS)), + } + } + + fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match value { + b"start" => Ok(Field::Start), + b"end" => Ok(Field::End), + _ => { + let value = ::__private::from_utf8_lossy(value); + Err(Error::unknown_field(&*value, FIELDS)) + } + } + } + } + + deserializer.deserialize_identifier(FieldVisitor) + } + } + + pub struct RangeVisitor<Idx> { + pub expecting: &'static str, + pub phantom: PhantomData<Idx>, + } + + impl<'de, Idx> Visitor<'de> for RangeVisitor<Idx> + where + Idx: Deserialize<'de>, + { + type Value = (Idx, Idx); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(self.expecting) + } + + fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let start: Idx = match try!(seq.next_element()) { + Some(value) => value, + None => { + return Err(Error::invalid_length(0, &self)); + } + }; + let end: Idx = match try!(seq.next_element()) { + Some(value) => value, + None => { + return Err(Error::invalid_length(1, &self)); + } + }; + Ok((start, end)) + } + + fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + let mut start: Option<Idx> = None; + let mut end: Option<Idx> = None; + while let Some(key) = try!(map.next_key()) { + match key { + Field::Start => { + if start.is_some() { + return Err(<A::Error as Error>::duplicate_field("start")); + } + start = Some(try!(map.next_value())); + } + Field::End => { + if end.is_some() { + return Err(<A::Error as Error>::duplicate_field("end")); + } + end = Some(try!(map.next_value())); + } + } + } + let start = match start { + Some(start) => start, + None => return Err(<A::Error as Error>::missing_field("start")), + }; + let end = match end { + Some(end) => end, + None => return Err(<A::Error as Error>::missing_field("end")), + }; + Ok((start, end)) + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(not(no_ops_bound), all(feature = "std", not(no_collections_bound))))] +impl<'de, T> Deserialize<'de> for Bound<T> +where + T: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + enum Field { + Unbounded, + Included, + Excluded, + } + + impl<'de> Deserialize<'de> for Field { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> Visitor<'de> for FieldVisitor { + type Value = Field; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("`Unbounded`, `Included` or `Excluded`") + } + + fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> + where + E: Error, + { + match value { + 0 => Ok(Field::Unbounded), + 1 => Ok(Field::Included), + 2 => Ok(Field::Excluded), + _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self)), + } + } + + fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> + where + E: Error, + { + match value { + "Unbounded" => Ok(Field::Unbounded), + "Included" => Ok(Field::Included), + "Excluded" => Ok(Field::Excluded), + _ => Err(Error::unknown_variant(value, VARIANTS)), + } + } + + fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match value { + b"Unbounded" => Ok(Field::Unbounded), + b"Included" => Ok(Field::Included), + b"Excluded" => Ok(Field::Excluded), + _ => match str::from_utf8(value) { + Ok(value) => Err(Error::unknown_variant(value, VARIANTS)), + Err(_) => { + Err(Error::invalid_value(Unexpected::Bytes(value), &self)) + } + }, + } + } + } + + deserializer.deserialize_identifier(FieldVisitor) + } + } + + struct BoundVisitor<T>(PhantomData<Bound<T>>); + + impl<'de, T> Visitor<'de> for BoundVisitor<T> + where + T: Deserialize<'de>, + { + type Value = Bound<T>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("enum Bound") + } + + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + match try!(data.variant()) { + (Field::Unbounded, v) => v.unit_variant().map(|()| Bound::Unbounded), + (Field::Included, v) => v.newtype_variant().map(Bound::Included), + (Field::Excluded, v) => v.newtype_variant().map(Bound::Excluded), + } + } + } + + const VARIANTS: &'static [&'static str] = &["Unbounded", "Included", "Excluded"]; + + deserializer.deserialize_enum("Bound", VARIANTS, BoundVisitor(PhantomData)) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<'de, T, E> Deserialize<'de> for Result<T, E> +where + T: Deserialize<'de>, + E: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + // If this were outside of the serde crate, it would just use: + // + // #[derive(Deserialize)] + // #[serde(variant_identifier)] + enum Field { + Ok, + Err, + } + + impl<'de> Deserialize<'de> for Field { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> Visitor<'de> for FieldVisitor { + type Value = Field; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("`Ok` or `Err`") + } + + fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> + where + E: Error, + { + match value { + 0 => Ok(Field::Ok), + 1 => Ok(Field::Err), + _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self)), + } + } + + fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> + where + E: Error, + { + match value { + "Ok" => Ok(Field::Ok), + "Err" => Ok(Field::Err), + _ => Err(Error::unknown_variant(value, VARIANTS)), + } + } + + fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match value { + b"Ok" => Ok(Field::Ok), + b"Err" => Ok(Field::Err), + _ => match str::from_utf8(value) { + Ok(value) => Err(Error::unknown_variant(value, VARIANTS)), + Err(_) => { + Err(Error::invalid_value(Unexpected::Bytes(value), &self)) + } + }, + } + } + } + + deserializer.deserialize_identifier(FieldVisitor) + } + } + + struct ResultVisitor<T, E>(PhantomData<Result<T, E>>); + + impl<'de, T, E> Visitor<'de> for ResultVisitor<T, E> + where + T: Deserialize<'de>, + E: Deserialize<'de>, + { + type Value = Result<T, E>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("enum Result") + } + + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + match try!(data.variant()) { + (Field::Ok, v) => v.newtype_variant().map(Ok), + (Field::Err, v) => v.newtype_variant().map(Err), + } + } + } + + const VARIANTS: &'static [&'static str] = &["Ok", "Err"]; + + deserializer.deserialize_enum("Result", VARIANTS, ResultVisitor(PhantomData)) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<'de, T> Deserialize<'de> for Wrapping<T> +where + T: Deserialize<'de>, +{ + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + Deserialize::deserialize(deserializer).map(Wrapping) + } +} + +#[cfg(all(feature = "std", not(no_std_atomic)))] +macro_rules! atomic_impl { + ($($ty:ident)*) => { + $( + impl<'de> Deserialize<'de> for $ty { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + Deserialize::deserialize(deserializer).map(Self::new) + } + } + )* + }; +} + +#[cfg(all(feature = "std", not(no_std_atomic)))] +atomic_impl! { + AtomicBool + AtomicI8 AtomicI16 AtomicI32 AtomicIsize + AtomicU8 AtomicU16 AtomicU32 AtomicUsize +} + +#[cfg(all(feature = "std", not(no_std_atomic64)))] +atomic_impl! { + AtomicI64 AtomicU64 +} + +#[cfg(feature = "std")] +struct FromStrVisitor<T> { + expecting: &'static str, + ty: PhantomData<T>, +} + +#[cfg(feature = "std")] +impl<T> FromStrVisitor<T> { + fn new(expecting: &'static str) -> Self { + FromStrVisitor { + expecting: expecting, + ty: PhantomData, + } + } +} + +#[cfg(feature = "std")] +impl<'de, T> Visitor<'de> for FromStrVisitor<T> +where + T: str::FromStr, + T::Err: fmt::Display, +{ + type Value = T; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(self.expecting) + } + + fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> + where + E: Error, + { + s.parse().map_err(Error::custom) + } +} diff --git a/vendor/serde/src/de/mod.rs b/vendor/serde/src/de/mod.rs new file mode 100644 index 000000000..6100815f7 --- /dev/null +++ b/vendor/serde/src/de/mod.rs @@ -0,0 +1,2300 @@ +//! Generic data structure deserialization framework. +//! +//! The two most important traits in this module are [`Deserialize`] and +//! [`Deserializer`]. +//! +//! - **A type that implements `Deserialize` is a data structure** that can be +//! deserialized from any data format supported by Serde, and conversely +//! - **A type that implements `Deserializer` is a data format** that can +//! deserialize any data structure supported by Serde. +//! +//! # The Deserialize trait +//! +//! Serde provides [`Deserialize`] implementations for many Rust primitive and +//! standard library types. The complete list is below. All of these can be +//! deserialized using Serde out of the box. +//! +//! Additionally, Serde provides a procedural macro called [`serde_derive`] to +//! automatically generate [`Deserialize`] implementations for structs and enums +//! in your program. See the [derive section of the manual] for how to use this. +//! +//! In rare cases it may be necessary to implement [`Deserialize`] manually for +//! some type in your program. See the [Implementing `Deserialize`] section of +//! the manual for more about this. +//! +//! Third-party crates may provide [`Deserialize`] implementations for types +//! that they expose. For example the [`linked-hash-map`] crate provides a +//! [`LinkedHashMap<K, V>`] type that is deserializable by Serde because the +//! crate provides an implementation of [`Deserialize`] for it. +//! +//! # The Deserializer trait +//! +//! [`Deserializer`] implementations are provided by third-party crates, for +//! example [`serde_json`], [`serde_yaml`] and [`bincode`]. +//! +//! A partial list of well-maintained formats is given on the [Serde +//! website][data formats]. +//! +//! # Implementations of Deserialize provided by Serde +//! +//! This is a slightly different set of types than what is supported for +//! serialization. Some types can be serialized by Serde but not deserialized. +//! One example is `OsStr`. +//! +//! - **Primitive types**: +//! - bool +//! - i8, i16, i32, i64, i128, isize +//! - u8, u16, u32, u64, u128, usize +//! - f32, f64 +//! - char +//! - **Compound types**: +//! - \[T; 0\] through \[T; 32\] +//! - tuples up to size 16 +//! - **Common standard library types**: +//! - String +//! - Option\<T\> +//! - Result\<T, E\> +//! - PhantomData\<T\> +//! - **Wrapper types**: +//! - Box\<T\> +//! - Box\<\[T\]\> +//! - Box\<str\> +//! - Cow\<'a, T\> +//! - Cell\<T\> +//! - RefCell\<T\> +//! - Mutex\<T\> +//! - RwLock\<T\> +//! - Rc\<T\> *(if* features = ["rc"] *is enabled)* +//! - Arc\<T\> *(if* features = ["rc"] *is enabled)* +//! - **Collection types**: +//! - BTreeMap\<K, V\> +//! - BTreeSet\<T\> +//! - BinaryHeap\<T\> +//! - HashMap\<K, V, H\> +//! - HashSet\<T, H\> +//! - LinkedList\<T\> +//! - VecDeque\<T\> +//! - Vec\<T\> +//! - **Zero-copy types**: +//! - &str +//! - &\[u8\] +//! - **FFI types**: +//! - CString +//! - Box\<CStr\> +//! - OsString +//! - **Miscellaneous standard library types**: +//! - Duration +//! - SystemTime +//! - Path +//! - PathBuf +//! - Range\<T\> +//! - RangeInclusive\<T\> +//! - Bound\<T\> +//! - num::NonZero* +//! - `!` *(unstable)* +//! - **Net types**: +//! - IpAddr +//! - Ipv4Addr +//! - Ipv6Addr +//! - SocketAddr +//! - SocketAddrV4 +//! - SocketAddrV6 +//! +//! [Implementing `Deserialize`]: https://serde.rs/impl-deserialize.html +//! [`Deserialize`]: ../trait.Deserialize.html +//! [`Deserializer`]: ../trait.Deserializer.html +//! [`LinkedHashMap<K, V>`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html +//! [`bincode`]: https://github.com/bincode-org/bincode +//! [`linked-hash-map`]: https://crates.io/crates/linked-hash-map +//! [`serde_derive`]: https://crates.io/crates/serde_derive +//! [`serde_json`]: https://github.com/serde-rs/json +//! [`serde_yaml`]: https://github.com/dtolnay/serde-yaml +//! [derive section of the manual]: https://serde.rs/derive.html +//! [data formats]: https://serde.rs/#data-formats + +use lib::*; + +//////////////////////////////////////////////////////////////////////////////// + +pub mod value; + +#[cfg(not(no_integer128))] +mod format; +mod ignored_any; +mod impls; +mod utf8; + +pub use self::ignored_any::IgnoredAny; + +#[cfg(feature = "std")] +#[doc(no_inline)] +pub use std::error::Error as StdError; +#[cfg(not(feature = "std"))] +#[doc(no_inline)] +pub use std_error::Error as StdError; + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! declare_error_trait { + (Error: Sized $(+ $($supertrait:ident)::+)*) => { + /// The `Error` trait allows `Deserialize` implementations to create descriptive + /// error messages belonging to the `Deserializer` against which they are + /// currently running. + /// + /// Every `Deserializer` declares an `Error` type that encompasses both + /// general-purpose deserialization errors as well as errors specific to the + /// particular deserialization format. For example the `Error` type of + /// `serde_json` can represent errors like an invalid JSON escape sequence or an + /// unterminated string literal, in addition to the error cases that are part of + /// this trait. + /// + /// Most deserializers should only need to provide the `Error::custom` method + /// and inherit the default behavior for the other methods. + /// + /// # Example implementation + /// + /// The [example data format] presented on the website shows an error + /// type appropriate for a basic JSON data format. + /// + /// [example data format]: https://serde.rs/data-format.html + pub trait Error: Sized $(+ $($supertrait)::+)* { + /// Raised when there is general error when deserializing a type. + /// + /// The message should not be capitalized and should not end with a period. + /// + /// ```edition2018 + /// # use std::str::FromStr; + /// # + /// # struct IpAddr; + /// # + /// # impl FromStr for IpAddr { + /// # type Err = String; + /// # + /// # fn from_str(_: &str) -> Result<Self, String> { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use serde::de::{self, Deserialize, Deserializer}; + /// + /// impl<'de> Deserialize<'de> for IpAddr { + /// fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + /// where + /// D: Deserializer<'de>, + /// { + /// let s = String::deserialize(deserializer)?; + /// s.parse().map_err(de::Error::custom) + /// } + /// } + /// ``` + fn custom<T>(msg: T) -> Self + where + T: Display; + + /// Raised when a `Deserialize` receives a type different from what it was + /// expecting. + /// + /// The `unexp` argument provides information about what type was received. + /// This is the type that was present in the input file or other source data + /// of the Deserializer. + /// + /// The `exp` argument provides information about what type was being + /// expected. This is the type that is written in the program. + /// + /// For example if we try to deserialize a String out of a JSON file + /// containing an integer, the unexpected type is the integer and the + /// expected type is the string. + #[cold] + fn invalid_type(unexp: Unexpected, exp: &Expected) -> Self { + Error::custom(format_args!("invalid type: {}, expected {}", unexp, exp)) + } + + /// Raised when a `Deserialize` receives a value of the right type but that + /// is wrong for some other reason. + /// + /// The `unexp` argument provides information about what value was received. + /// This is the value that was present in the input file or other source + /// data of the Deserializer. + /// + /// The `exp` argument provides information about what value was being + /// expected. This is the type that is written in the program. + /// + /// For example if we try to deserialize a String out of some binary data + /// that is not valid UTF-8, the unexpected value is the bytes and the + /// expected value is a string. + #[cold] + fn invalid_value(unexp: Unexpected, exp: &Expected) -> Self { + Error::custom(format_args!("invalid value: {}, expected {}", unexp, exp)) + } + + /// Raised when deserializing a sequence or map and the input data contains + /// too many or too few elements. + /// + /// The `len` argument is the number of elements encountered. The sequence + /// or map may have expected more arguments or fewer arguments. + /// + /// The `exp` argument provides information about what data was being + /// expected. For example `exp` might say that a tuple of size 6 was + /// expected. + #[cold] + fn invalid_length(len: usize, exp: &Expected) -> Self { + Error::custom(format_args!("invalid length {}, expected {}", len, exp)) + } + + /// Raised when a `Deserialize` enum type received a variant with an + /// unrecognized name. + #[cold] + fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self { + if expected.is_empty() { + Error::custom(format_args!( + "unknown variant `{}`, there are no variants", + variant + )) + } else { + Error::custom(format_args!( + "unknown variant `{}`, expected {}", + variant, + OneOf { names: expected } + )) + } + } + + /// Raised when a `Deserialize` struct type received a field with an + /// unrecognized name. + #[cold] + fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self { + if expected.is_empty() { + Error::custom(format_args!( + "unknown field `{}`, there are no fields", + field + )) + } else { + Error::custom(format_args!( + "unknown field `{}`, expected {}", + field, + OneOf { names: expected } + )) + } + } + + /// Raised when a `Deserialize` struct type expected to receive a required + /// field with a particular name but that field was not present in the + /// input. + #[cold] + fn missing_field(field: &'static str) -> Self { + Error::custom(format_args!("missing field `{}`", field)) + } + + /// Raised when a `Deserialize` struct type received more than one of the + /// same field. + #[cold] + fn duplicate_field(field: &'static str) -> Self { + Error::custom(format_args!("duplicate field `{}`", field)) + } + } + } +} + +#[cfg(feature = "std")] +declare_error_trait!(Error: Sized + StdError); + +#[cfg(not(feature = "std"))] +declare_error_trait!(Error: Sized + Debug + Display); + +/// `Unexpected` represents an unexpected invocation of any one of the `Visitor` +/// trait methods. +/// +/// This is used as an argument to the `invalid_type`, `invalid_value`, and +/// `invalid_length` methods of the `Error` trait to build error messages. +/// +/// ```edition2018 +/// # use std::fmt; +/// # +/// # use serde::de::{self, Unexpected, Visitor}; +/// # +/// # struct Example; +/// # +/// # impl<'de> Visitor<'de> for Example { +/// # type Value = (); +/// # +/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +/// # write!(formatter, "definitely not a boolean") +/// # } +/// # +/// fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> +/// where +/// E: de::Error, +/// { +/// Err(de::Error::invalid_type(Unexpected::Bool(v), &self)) +/// } +/// # } +/// ``` +#[derive(Copy, Clone, PartialEq, Debug)] +pub enum Unexpected<'a> { + /// The input contained a boolean value that was not expected. + Bool(bool), + + /// The input contained an unsigned integer `u8`, `u16`, `u32` or `u64` that + /// was not expected. + Unsigned(u64), + + /// The input contained a signed integer `i8`, `i16`, `i32` or `i64` that + /// was not expected. + Signed(i64), + + /// The input contained a floating point `f32` or `f64` that was not + /// expected. + Float(f64), + + /// The input contained a `char` that was not expected. + Char(char), + + /// The input contained a `&str` or `String` that was not expected. + Str(&'a str), + + /// The input contained a `&[u8]` or `Vec<u8>` that was not expected. + Bytes(&'a [u8]), + + /// The input contained a unit `()` that was not expected. + Unit, + + /// The input contained an `Option<T>` that was not expected. + Option, + + /// The input contained a newtype struct that was not expected. + NewtypeStruct, + + /// The input contained a sequence that was not expected. + Seq, + + /// The input contained a map that was not expected. + Map, + + /// The input contained an enum that was not expected. + Enum, + + /// The input contained a unit variant that was not expected. + UnitVariant, + + /// The input contained a newtype variant that was not expected. + NewtypeVariant, + + /// The input contained a tuple variant that was not expected. + TupleVariant, + + /// The input contained a struct variant that was not expected. + StructVariant, + + /// A message stating what uncategorized thing the input contained that was + /// not expected. + /// + /// The message should be a noun or noun phrase, not capitalized and without + /// a period. An example message is "unoriginal superhero". + Other(&'a str), +} + +impl<'a> fmt::Display for Unexpected<'a> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + use self::Unexpected::*; + match *self { + Bool(b) => write!(formatter, "boolean `{}`", b), + Unsigned(i) => write!(formatter, "integer `{}`", i), + Signed(i) => write!(formatter, "integer `{}`", i), + Float(f) => write!(formatter, "floating point `{}`", f), + Char(c) => write!(formatter, "character `{}`", c), + Str(s) => write!(formatter, "string {:?}", s), + Bytes(_) => write!(formatter, "byte array"), + Unit => write!(formatter, "unit value"), + Option => write!(formatter, "Option value"), + NewtypeStruct => write!(formatter, "newtype struct"), + Seq => write!(formatter, "sequence"), + Map => write!(formatter, "map"), + Enum => write!(formatter, "enum"), + UnitVariant => write!(formatter, "unit variant"), + NewtypeVariant => write!(formatter, "newtype variant"), + TupleVariant => write!(formatter, "tuple variant"), + StructVariant => write!(formatter, "struct variant"), + Other(other) => formatter.write_str(other), + } + } +} + +/// `Expected` represents an explanation of what data a `Visitor` was expecting +/// to receive. +/// +/// This is used as an argument to the `invalid_type`, `invalid_value`, and +/// `invalid_length` methods of the `Error` trait to build error messages. The +/// message should be a noun or noun phrase that completes the sentence "This +/// Visitor expects to receive ...", for example the message could be "an +/// integer between 0 and 64". The message should not be capitalized and should +/// not end with a period. +/// +/// Within the context of a `Visitor` implementation, the `Visitor` itself +/// (`&self`) is an implementation of this trait. +/// +/// ```edition2018 +/// # use std::fmt; +/// # +/// # use serde::de::{self, Unexpected, Visitor}; +/// # +/// # struct Example; +/// # +/// # impl<'de> Visitor<'de> for Example { +/// # type Value = (); +/// # +/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +/// # write!(formatter, "definitely not a boolean") +/// # } +/// # +/// fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> +/// where +/// E: de::Error, +/// { +/// Err(de::Error::invalid_type(Unexpected::Bool(v), &self)) +/// } +/// # } +/// ``` +/// +/// Outside of a `Visitor`, `&"..."` can be used. +/// +/// ```edition2018 +/// # use serde::de::{self, Unexpected}; +/// # +/// # fn example<E>() -> Result<(), E> +/// # where +/// # E: de::Error, +/// # { +/// # let v = true; +/// return Err(de::Error::invalid_type(Unexpected::Bool(v), &"a negative integer")); +/// # } +/// ``` +pub trait Expected { + /// Format an explanation of what data was being expected. Same signature as + /// the `Display` and `Debug` traits. + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result; +} + +impl<'de, T> Expected for T +where + T: Visitor<'de>, +{ + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + self.expecting(formatter) + } +} + +impl<'a> Expected for &'a str { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(self) + } +} + +impl<'a> Display for Expected + 'a { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + Expected::fmt(self, formatter) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A **data structure** that can be deserialized from any data format supported +/// by Serde. +/// +/// Serde provides `Deserialize` implementations for many Rust primitive and +/// standard library types. The complete list is [here][de]. All of these can +/// be deserialized using Serde out of the box. +/// +/// Additionally, Serde provides a procedural macro called `serde_derive` to +/// automatically generate `Deserialize` implementations for structs and enums +/// in your program. See the [derive section of the manual][derive] for how to +/// use this. +/// +/// In rare cases it may be necessary to implement `Deserialize` manually for +/// some type in your program. See the [Implementing +/// `Deserialize`][impl-deserialize] section of the manual for more about this. +/// +/// Third-party crates may provide `Deserialize` implementations for types that +/// they expose. For example the `linked-hash-map` crate provides a +/// `LinkedHashMap<K, V>` type that is deserializable by Serde because the crate +/// provides an implementation of `Deserialize` for it. +/// +/// [de]: https://docs.serde.rs/serde/de/index.html +/// [derive]: https://serde.rs/derive.html +/// [impl-deserialize]: https://serde.rs/impl-deserialize.html +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed by `Self` when deserialized. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +pub trait Deserialize<'de>: Sized { + /// Deserialize this value from the given Serde deserializer. + /// + /// See the [Implementing `Deserialize`][impl-deserialize] section of the + /// manual for more information about how to implement this method. + /// + /// [impl-deserialize]: https://serde.rs/impl-deserialize.html + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>; + + /// Deserializes a value into `self` from the given Deserializer. + /// + /// The purpose of this method is to allow the deserializer to reuse + /// resources and avoid copies. As such, if this method returns an error, + /// `self` will be in an indeterminate state where some parts of the struct + /// have been overwritten. Although whatever state that is will be + /// memory-safe. + /// + /// This is generally useful when repeatedly deserializing values that + /// are processed one at a time, where the value of `self` doesn't matter + /// when the next deserialization occurs. + /// + /// If you manually implement this, your recursive deserializations should + /// use `deserialize_in_place`. + /// + /// This method is stable and an official public API, but hidden from the + /// documentation because it is almost never what newbies are looking for. + /// Showing it in rustdoc would cause it to be featured more prominently + /// than it deserves. + #[doc(hidden)] + fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> + where + D: Deserializer<'de>, + { + // Default implementation just delegates to `deserialize` impl. + *place = Deserialize::deserialize(deserializer)?; + Ok(()) + } +} + +/// A data structure that can be deserialized without borrowing any data from +/// the deserializer. +/// +/// This is primarily useful for trait bounds on functions. For example a +/// `from_str` function may be able to deserialize a data structure that borrows +/// from the input string, but a `from_reader` function may only deserialize +/// owned data. +/// +/// ```edition2018 +/// # use serde::de::{Deserialize, DeserializeOwned}; +/// # use std::io::{Read, Result}; +/// # +/// # trait Ignore { +/// fn from_str<'a, T>(s: &'a str) -> Result<T> +/// where +/// T: Deserialize<'a>; +/// +/// fn from_reader<R, T>(rdr: R) -> Result<T> +/// where +/// R: Read, +/// T: DeserializeOwned; +/// # } +/// ``` +/// +/// # Lifetime +/// +/// The relationship between `Deserialize` and `DeserializeOwned` in trait +/// bounds is explained in more detail on the page [Understanding deserializer +/// lifetimes]. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +pub trait DeserializeOwned: for<'de> Deserialize<'de> {} +impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {} + +/// `DeserializeSeed` is the stateful form of the `Deserialize` trait. If you +/// ever find yourself looking for a way to pass data into a `Deserialize` impl, +/// this trait is the way to do it. +/// +/// As one example of stateful deserialization consider deserializing a JSON +/// array into an existing buffer. Using the `Deserialize` trait we could +/// deserialize a JSON array into a `Vec<T>` but it would be a freshly allocated +/// `Vec<T>`; there is no way for `Deserialize` to reuse a previously allocated +/// buffer. Using `DeserializeSeed` instead makes this possible as in the +/// example code below. +/// +/// The canonical API for stateless deserialization looks like this: +/// +/// ```edition2018 +/// # use serde::Deserialize; +/// # +/// # enum Error {} +/// # +/// fn func<'de, T: Deserialize<'de>>() -> Result<T, Error> +/// # { +/// # unimplemented!() +/// # } +/// ``` +/// +/// Adjusting an API like this to support stateful deserialization is a matter +/// of accepting a seed as input: +/// +/// ```edition2018 +/// # use serde::de::DeserializeSeed; +/// # +/// # enum Error {} +/// # +/// fn func_seed<'de, T: DeserializeSeed<'de>>(seed: T) -> Result<T::Value, Error> +/// # { +/// # let _ = seed; +/// # unimplemented!() +/// # } +/// ``` +/// +/// In practice the majority of deserialization is stateless. An API expecting a +/// seed can be appeased by passing `std::marker::PhantomData` as a seed in the +/// case of stateless deserialization. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed by `Self::Value` when deserialized. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example +/// +/// Suppose we have JSON that looks like `[[1, 2], [3, 4, 5], [6]]` and we need +/// to deserialize it into a flat representation like `vec![1, 2, 3, 4, 5, 6]`. +/// Allocating a brand new `Vec<T>` for each subarray would be slow. Instead we +/// would like to allocate a single `Vec<T>` and then deserialize each subarray +/// into it. This requires stateful deserialization using the `DeserializeSeed` +/// trait. +/// +/// ```edition2018 +/// use std::fmt; +/// use std::marker::PhantomData; +/// +/// use serde::de::{Deserialize, DeserializeSeed, Deserializer, SeqAccess, Visitor}; +/// +/// // A DeserializeSeed implementation that uses stateful deserialization to +/// // append array elements onto the end of an existing vector. The preexisting +/// // state ("seed") in this case is the Vec<T>. The `deserialize` method of +/// // `ExtendVec` will be traversing the inner arrays of the JSON input and +/// // appending each integer into the existing Vec. +/// struct ExtendVec<'a, T: 'a>(&'a mut Vec<T>); +/// +/// impl<'de, 'a, T> DeserializeSeed<'de> for ExtendVec<'a, T> +/// where +/// T: Deserialize<'de>, +/// { +/// // The return type of the `deserialize` method. This implementation +/// // appends onto an existing vector but does not create any new data +/// // structure, so the return type is (). +/// type Value = (); +/// +/// fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> +/// where +/// D: Deserializer<'de>, +/// { +/// // Visitor implementation that will walk an inner array of the JSON +/// // input. +/// struct ExtendVecVisitor<'a, T: 'a>(&'a mut Vec<T>); +/// +/// impl<'de, 'a, T> Visitor<'de> for ExtendVecVisitor<'a, T> +/// where +/// T: Deserialize<'de>, +/// { +/// type Value = (); +/// +/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +/// write!(formatter, "an array of integers") +/// } +/// +/// fn visit_seq<A>(self, mut seq: A) -> Result<(), A::Error> +/// where +/// A: SeqAccess<'de>, +/// { +/// // Decrease the number of reallocations if there are many elements +/// if let Some(size_hint) = seq.size_hint() { +/// self.0.reserve(size_hint); +/// } +/// +/// // Visit each element in the inner array and push it onto +/// // the existing vector. +/// while let Some(elem) = seq.next_element()? { +/// self.0.push(elem); +/// } +/// Ok(()) +/// } +/// } +/// +/// deserializer.deserialize_seq(ExtendVecVisitor(self.0)) +/// } +/// } +/// +/// // Visitor implementation that will walk the outer array of the JSON input. +/// struct FlattenedVecVisitor<T>(PhantomData<T>); +/// +/// impl<'de, T> Visitor<'de> for FlattenedVecVisitor<T> +/// where +/// T: Deserialize<'de>, +/// { +/// // This Visitor constructs a single Vec<T> to hold the flattened +/// // contents of the inner arrays. +/// type Value = Vec<T>; +/// +/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +/// write!(formatter, "an array of arrays") +/// } +/// +/// fn visit_seq<A>(self, mut seq: A) -> Result<Vec<T>, A::Error> +/// where +/// A: SeqAccess<'de>, +/// { +/// // Create a single Vec to hold the flattened contents. +/// let mut vec = Vec::new(); +/// +/// // Each iteration through this loop is one inner array. +/// while let Some(()) = seq.next_element_seed(ExtendVec(&mut vec))? { +/// // Nothing to do; inner array has been appended into `vec`. +/// } +/// +/// // Return the finished vec. +/// Ok(vec) +/// } +/// } +/// +/// # fn example<'de, D>(deserializer: D) -> Result<(), D::Error> +/// # where +/// # D: Deserializer<'de>, +/// # { +/// let visitor = FlattenedVecVisitor(PhantomData); +/// let flattened: Vec<u64> = deserializer.deserialize_seq(visitor)?; +/// # Ok(()) +/// # } +/// ``` +pub trait DeserializeSeed<'de>: Sized { + /// The type produced by using this seed. + type Value; + + /// Equivalent to the more common `Deserialize::deserialize` method, except + /// with some initial piece of data (the seed) passed in. + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>; +} + +impl<'de, T> DeserializeSeed<'de> for PhantomData<T> +where + T: Deserialize<'de>, +{ + type Value = T; + + #[inline] + fn deserialize<D>(self, deserializer: D) -> Result<T, D::Error> + where + D: Deserializer<'de>, + { + T::deserialize(deserializer) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A **data format** that can deserialize any data structure supported by +/// Serde. +/// +/// The role of this trait is to define the deserialization half of the [Serde +/// data model], which is a way to categorize every Rust data type into one of +/// 29 possible types. Each method of the `Deserializer` trait corresponds to one +/// of the types of the data model. +/// +/// Implementations of `Deserialize` map themselves into this data model by +/// passing to the `Deserializer` a `Visitor` implementation that can receive +/// these various types. +/// +/// The types that make up the Serde data model are: +/// +/// - **14 primitive types** +/// - bool +/// - i8, i16, i32, i64, i128 +/// - u8, u16, u32, u64, u128 +/// - f32, f64 +/// - char +/// - **string** +/// - UTF-8 bytes with a length and no null terminator. +/// - When serializing, all strings are handled equally. When deserializing, +/// there are three flavors of strings: transient, owned, and borrowed. +/// - **byte array** - \[u8\] +/// - Similar to strings, during deserialization byte arrays can be +/// transient, owned, or borrowed. +/// - **option** +/// - Either none or some value. +/// - **unit** +/// - The type of `()` in Rust. It represents an anonymous value containing +/// no data. +/// - **unit_struct** +/// - For example `struct Unit` or `PhantomData<T>`. It represents a named +/// value containing no data. +/// - **unit_variant** +/// - For example the `E::A` and `E::B` in `enum E { A, B }`. +/// - **newtype_struct** +/// - For example `struct Millimeters(u8)`. +/// - **newtype_variant** +/// - For example the `E::N` in `enum E { N(u8) }`. +/// - **seq** +/// - A variably sized heterogeneous sequence of values, for example `Vec<T>` +/// or `HashSet<T>`. When serializing, the length may or may not be known +/// before iterating through all the data. When deserializing, the length +/// is determined by looking at the serialized data. +/// - **tuple** +/// - A statically sized heterogeneous sequence of values for which the +/// length will be known at deserialization time without looking at the +/// serialized data, for example `(u8,)` or `(String, u64, Vec<T>)` or +/// `[u64; 10]`. +/// - **tuple_struct** +/// - A named tuple, for example `struct Rgb(u8, u8, u8)`. +/// - **tuple_variant** +/// - For example the `E::T` in `enum E { T(u8, u8) }`. +/// - **map** +/// - A heterogeneous key-value pairing, for example `BTreeMap<K, V>`. +/// - **struct** +/// - A heterogeneous key-value pairing in which the keys are strings and +/// will be known at deserialization time without looking at the serialized +/// data, for example `struct S { r: u8, g: u8, b: u8 }`. +/// - **struct_variant** +/// - For example the `E::S` in `enum E { S { r: u8, g: u8, b: u8 } }`. +/// +/// The `Deserializer` trait supports two entry point styles which enables +/// different kinds of deserialization. +/// +/// 1. The `deserialize` method. Self-describing data formats like JSON are able +/// to look at the serialized data and tell what it represents. For example +/// the JSON deserializer may see an opening curly brace (`{`) and know that +/// it is seeing a map. If the data format supports +/// `Deserializer::deserialize_any`, it will drive the Visitor using whatever +/// type it sees in the input. JSON uses this approach when deserializing +/// `serde_json::Value` which is an enum that can represent any JSON +/// document. Without knowing what is in a JSON document, we can deserialize +/// it to `serde_json::Value` by going through +/// `Deserializer::deserialize_any`. +/// +/// 2. The various `deserialize_*` methods. Non-self-describing formats like +/// Bincode need to be told what is in the input in order to deserialize it. +/// The `deserialize_*` methods are hints to the deserializer for how to +/// interpret the next piece of input. Non-self-describing formats are not +/// able to deserialize something like `serde_json::Value` which relies on +/// `Deserializer::deserialize_any`. +/// +/// When implementing `Deserialize`, you should avoid relying on +/// `Deserializer::deserialize_any` unless you need to be told by the +/// Deserializer what type is in the input. Know that relying on +/// `Deserializer::deserialize_any` means your data type will be able to +/// deserialize from self-describing formats only, ruling out Bincode and many +/// others. +/// +/// [Serde data model]: https://serde.rs/data-model.html +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed from the input when deserializing. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example implementation +/// +/// The [example data format] presented on the website contains example code for +/// a basic JSON `Deserializer`. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait Deserializer<'de>: Sized { + /// The error type that can be returned if some error occurs during + /// deserialization. + type Error: Error; + + /// Require the `Deserializer` to figure out how to drive the visitor based + /// on what data type is in the input. + /// + /// When implementing `Deserialize`, you should avoid relying on + /// `Deserializer::deserialize_any` unless you need to be told by the + /// Deserializer what type is in the input. Know that relying on + /// `Deserializer::deserialize_any` means your data type will be able to + /// deserialize from self-describing formats only, ruling out Bincode and + /// many others. + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a `bool` value. + fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting an `i8` value. + fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting an `i16` value. + fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting an `i32` value. + fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting an `i64` value. + fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + serde_if_integer128! { + /// Hint that the `Deserialize` type is expecting an `i128` value. + /// + /// This method is available only on Rust compiler versions >=1.26. The + /// default behavior unconditionally returns an error. + fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de> + { + let _ = visitor; + Err(Error::custom("i128 is not supported")) + } + } + + /// Hint that the `Deserialize` type is expecting a `u8` value. + fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a `u16` value. + fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a `u32` value. + fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a `u64` value. + fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + serde_if_integer128! { + /// Hint that the `Deserialize` type is expecting an `u128` value. + /// + /// This method is available only on Rust compiler versions >=1.26. The + /// default behavior unconditionally returns an error. + fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de> + { + let _ = visitor; + Err(Error::custom("u128 is not supported")) + } + } + + /// Hint that the `Deserialize` type is expecting a `f32` value. + fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a `f64` value. + fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a `char` value. + fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a string value and does + /// not benefit from taking ownership of buffered data owned by the + /// `Deserializer`. + /// + /// If the `Visitor` would benefit from taking ownership of `String` data, + /// indicate this to the `Deserializer` by using `deserialize_string` + /// instead. + fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a string value and would + /// benefit from taking ownership of buffered data owned by the + /// `Deserializer`. + /// + /// If the `Visitor` would not benefit from taking ownership of `String` + /// data, indicate that to the `Deserializer` by using `deserialize_str` + /// instead. + fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a byte array and does not + /// benefit from taking ownership of buffered data owned by the + /// `Deserializer`. + /// + /// If the `Visitor` would benefit from taking ownership of `Vec<u8>` data, + /// indicate this to the `Deserializer` by using `deserialize_byte_buf` + /// instead. + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a byte array and would + /// benefit from taking ownership of buffered data owned by the + /// `Deserializer`. + /// + /// If the `Visitor` would not benefit from taking ownership of `Vec<u8>` + /// data, indicate that to the `Deserializer` by using `deserialize_bytes` + /// instead. + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting an optional value. + /// + /// This allows deserializers that encode an optional value as a nullable + /// value to convert the null value into `None` and a regular value into + /// `Some(value)`. + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a unit value. + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a unit struct with a + /// particular name. + fn deserialize_unit_struct<V>( + self, + name: &'static str, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a newtype struct with a + /// particular name. + fn deserialize_newtype_struct<V>( + self, + name: &'static str, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a sequence of values. + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a sequence of values and + /// knows how many values there are without looking at the serialized data. + fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a tuple struct with a + /// particular name and number of fields. + fn deserialize_tuple_struct<V>( + self, + name: &'static str, + len: usize, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a map of key-value pairs. + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting a struct with a particular + /// name and fields. + fn deserialize_struct<V>( + self, + name: &'static str, + fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting an enum value with a + /// particular name and possible variants. + fn deserialize_enum<V>( + self, + name: &'static str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type is expecting the name of a struct + /// field or the discriminant of an enum variant. + fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Hint that the `Deserialize` type needs to deserialize a value whose type + /// doesn't matter because it is ignored. + /// + /// Deserializers for non-self-describing formats may not support this mode. + fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Determine whether `Deserialize` implementations should expect to + /// deserialize their human-readable form. + /// + /// Some types have a human-readable form that may be somewhat expensive to + /// construct, as well as a binary form that is compact and efficient. + /// Generally text-based formats like JSON and YAML will prefer to use the + /// human-readable one and binary formats like Bincode will prefer the + /// compact one. + /// + /// ```edition2018 + /// # use std::ops::Add; + /// # use std::str::FromStr; + /// # + /// # struct Timestamp; + /// # + /// # impl Timestamp { + /// # const EPOCH: Timestamp = Timestamp; + /// # } + /// # + /// # impl FromStr for Timestamp { + /// # type Err = String; + /// # fn from_str(_: &str) -> Result<Self, Self::Err> { + /// # unimplemented!() + /// # } + /// # } + /// # + /// # struct Duration; + /// # + /// # impl Duration { + /// # fn seconds(_: u64) -> Self { unimplemented!() } + /// # } + /// # + /// # impl Add<Duration> for Timestamp { + /// # type Output = Timestamp; + /// # fn add(self, _: Duration) -> Self::Output { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use serde::de::{self, Deserialize, Deserializer}; + /// + /// impl<'de> Deserialize<'de> for Timestamp { + /// fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + /// where + /// D: Deserializer<'de>, + /// { + /// if deserializer.is_human_readable() { + /// // Deserialize from a human-readable string like "2015-05-15T17:01:00Z". + /// let s = String::deserialize(deserializer)?; + /// Timestamp::from_str(&s).map_err(de::Error::custom) + /// } else { + /// // Deserialize from a compact binary representation, seconds since + /// // the Unix epoch. + /// let n = u64::deserialize(deserializer)?; + /// Ok(Timestamp::EPOCH + Duration::seconds(n)) + /// } + /// } + /// } + /// ``` + /// + /// The default implementation of this method returns `true`. Data formats + /// may override this to `false` to request a compact form for types that + /// support one. Note that modifying this method to change a format from + /// human-readable to compact or vice versa should be regarded as a breaking + /// change, as a value serialized in human-readable mode is not required to + /// deserialize from the same data in compact mode. + #[inline] + fn is_human_readable(&self) -> bool { + true + } + + // Not public API. + #[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))] + #[doc(hidden)] + fn __deserialize_content<V>( + self, + _: ::actually_private::T, + visitor: V, + ) -> Result<::private::de::Content<'de>, Self::Error> + where + V: Visitor<'de, Value = ::private::de::Content<'de>>, + { + self.deserialize_any(visitor) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// This trait represents a visitor that walks through a deserializer. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the requirement for lifetime of data +/// that may be borrowed by `Self::Value`. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example +/// +/// ```edition2018 +/// # use std::fmt; +/// # +/// # use serde::de::{self, Unexpected, Visitor}; +/// # +/// /// A visitor that deserializes a long string - a string containing at least +/// /// some minimum number of bytes. +/// struct LongString { +/// min: usize, +/// } +/// +/// impl<'de> Visitor<'de> for LongString { +/// type Value = String; +/// +/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { +/// write!(formatter, "a string containing at least {} bytes", self.min) +/// } +/// +/// fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> +/// where +/// E: de::Error, +/// { +/// if s.len() >= self.min { +/// Ok(s.to_owned()) +/// } else { +/// Err(de::Error::invalid_value(Unexpected::Str(s), &self)) +/// } +/// } +/// } +/// ``` +pub trait Visitor<'de>: Sized { + /// The value produced by this visitor. + type Value; + + /// Format a message stating what data this Visitor expects to receive. + /// + /// This is used in error messages. The message should complete the sentence + /// "This Visitor expects to receive ...", for example the message could be + /// "an integer between 0 and 64". The message should not be capitalized and + /// should not end with a period. + /// + /// ```edition2018 + /// # use std::fmt; + /// # + /// # struct S { + /// # max: usize, + /// # } + /// # + /// # impl<'de> serde::de::Visitor<'de> for S { + /// # type Value = (); + /// # + /// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + /// write!(formatter, "an integer between 0 and {}", self.max) + /// } + /// # } + /// ``` + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result; + + /// The input contains a boolean. + /// + /// The default implementation fails with a type error. + fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Bool(v), &self)) + } + + /// The input contains an `i8`. + /// + /// The default implementation forwards to [`visit_i64`]. + /// + /// [`visit_i64`]: #method.visit_i64 + fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_i64(v as i64) + } + + /// The input contains an `i16`. + /// + /// The default implementation forwards to [`visit_i64`]. + /// + /// [`visit_i64`]: #method.visit_i64 + fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_i64(v as i64) + } + + /// The input contains an `i32`. + /// + /// The default implementation forwards to [`visit_i64`]. + /// + /// [`visit_i64`]: #method.visit_i64 + fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_i64(v as i64) + } + + /// The input contains an `i64`. + /// + /// The default implementation fails with a type error. + fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Signed(v), &self)) + } + + serde_if_integer128! { + /// The input contains a `i128`. + /// + /// This method is available only on Rust compiler versions >=1.26. The + /// default implementation fails with a type error. + fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E> + where + E: Error, + { + let mut buf = [0u8; 58]; + let mut writer = format::Buf::new(&mut buf); + fmt::Write::write_fmt(&mut writer, format_args!("integer `{}` as i128", v)).unwrap(); + Err(Error::invalid_type(Unexpected::Other(writer.as_str()), &self)) + } + } + + /// The input contains a `u8`. + /// + /// The default implementation forwards to [`visit_u64`]. + /// + /// [`visit_u64`]: #method.visit_u64 + fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_u64(v as u64) + } + + /// The input contains a `u16`. + /// + /// The default implementation forwards to [`visit_u64`]. + /// + /// [`visit_u64`]: #method.visit_u64 + fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_u64(v as u64) + } + + /// The input contains a `u32`. + /// + /// The default implementation forwards to [`visit_u64`]. + /// + /// [`visit_u64`]: #method.visit_u64 + fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_u64(v as u64) + } + + /// The input contains a `u64`. + /// + /// The default implementation fails with a type error. + fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Unsigned(v), &self)) + } + + serde_if_integer128! { + /// The input contains a `u128`. + /// + /// This method is available only on Rust compiler versions >=1.26. The + /// default implementation fails with a type error. + fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E> + where + E: Error, + { + let mut buf = [0u8; 57]; + let mut writer = format::Buf::new(&mut buf); + fmt::Write::write_fmt(&mut writer, format_args!("integer `{}` as u128", v)).unwrap(); + Err(Error::invalid_type(Unexpected::Other(writer.as_str()), &self)) + } + } + + /// The input contains an `f32`. + /// + /// The default implementation forwards to [`visit_f64`]. + /// + /// [`visit_f64`]: #method.visit_f64 + fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_f64(v as f64) + } + + /// The input contains an `f64`. + /// + /// The default implementation fails with a type error. + fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Float(v), &self)) + } + + /// The input contains a `char`. + /// + /// The default implementation forwards to [`visit_str`] as a one-character + /// string. + /// + /// [`visit_str`]: #method.visit_str + #[inline] + fn visit_char<E>(self, v: char) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_str(utf8::encode(v).as_str()) + } + + /// The input contains a string. The lifetime of the string is ephemeral and + /// it may be destroyed after this method returns. + /// + /// This method allows the `Deserializer` to avoid a copy by retaining + /// ownership of any buffered data. `Deserialize` implementations that do + /// not benefit from taking ownership of `String` data should indicate that + /// to the deserializer by using `Deserializer::deserialize_str` rather than + /// `Deserializer::deserialize_string`. + /// + /// It is never correct to implement `visit_string` without implementing + /// `visit_str`. Implement neither, both, or just `visit_str`. + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Str(v), &self)) + } + + /// The input contains a string that lives at least as long as the + /// `Deserializer`. + /// + /// This enables zero-copy deserialization of strings in some formats. For + /// example JSON input containing the JSON string `"borrowed"` can be + /// deserialized with zero copying into a `&'a str` as long as the input + /// data outlives `'a`. + /// + /// The default implementation forwards to `visit_str`. + #[inline] + fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_str(v) + } + + /// The input contains a string and ownership of the string is being given + /// to the `Visitor`. + /// + /// This method allows the `Visitor` to avoid a copy by taking ownership of + /// a string created by the `Deserializer`. `Deserialize` implementations + /// that benefit from taking ownership of `String` data should indicate that + /// to the deserializer by using `Deserializer::deserialize_string` rather + /// than `Deserializer::deserialize_str`, although not every deserializer + /// will honor such a request. + /// + /// It is never correct to implement `visit_string` without implementing + /// `visit_str`. Implement neither, both, or just `visit_str`. + /// + /// The default implementation forwards to `visit_str` and then drops the + /// `String`. + #[inline] + #[cfg(any(feature = "std", feature = "alloc"))] + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_str(&v) + } + + /// The input contains a byte array. The lifetime of the byte array is + /// ephemeral and it may be destroyed after this method returns. + /// + /// This method allows the `Deserializer` to avoid a copy by retaining + /// ownership of any buffered data. `Deserialize` implementations that do + /// not benefit from taking ownership of `Vec<u8>` data should indicate that + /// to the deserializer by using `Deserializer::deserialize_bytes` rather + /// than `Deserializer::deserialize_byte_buf`. + /// + /// It is never correct to implement `visit_byte_buf` without implementing + /// `visit_bytes`. Implement neither, both, or just `visit_bytes`. + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + let _ = v; + Err(Error::invalid_type(Unexpected::Bytes(v), &self)) + } + + /// The input contains a byte array that lives at least as long as the + /// `Deserializer`. + /// + /// This enables zero-copy deserialization of bytes in some formats. For + /// example Bincode data containing bytes can be deserialized with zero + /// copying into a `&'a [u8]` as long as the input data outlives `'a`. + /// + /// The default implementation forwards to `visit_bytes`. + #[inline] + fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_bytes(v) + } + + /// The input contains a byte array and ownership of the byte array is being + /// given to the `Visitor`. + /// + /// This method allows the `Visitor` to avoid a copy by taking ownership of + /// a byte buffer created by the `Deserializer`. `Deserialize` + /// implementations that benefit from taking ownership of `Vec<u8>` data + /// should indicate that to the deserializer by using + /// `Deserializer::deserialize_byte_buf` rather than + /// `Deserializer::deserialize_bytes`, although not every deserializer will + /// honor such a request. + /// + /// It is never correct to implement `visit_byte_buf` without implementing + /// `visit_bytes`. Implement neither, both, or just `visit_bytes`. + /// + /// The default implementation forwards to `visit_bytes` and then drops the + /// `Vec<u8>`. + #[cfg(any(feature = "std", feature = "alloc"))] + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + self.visit_bytes(&v) + } + + /// The input contains an optional that is absent. + /// + /// The default implementation fails with a type error. + fn visit_none<E>(self) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Option, &self)) + } + + /// The input contains an optional that is present. + /// + /// The default implementation fails with a type error. + fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + let _ = deserializer; + Err(Error::invalid_type(Unexpected::Option, &self)) + } + + /// The input contains a unit `()`. + /// + /// The default implementation fails with a type error. + fn visit_unit<E>(self) -> Result<Self::Value, E> + where + E: Error, + { + Err(Error::invalid_type(Unexpected::Unit, &self)) + } + + /// The input contains a newtype struct. + /// + /// The content of the newtype struct may be read from the given + /// `Deserializer`. + /// + /// The default implementation fails with a type error. + fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + let _ = deserializer; + Err(Error::invalid_type(Unexpected::NewtypeStruct, &self)) + } + + /// The input contains a sequence of elements. + /// + /// The default implementation fails with a type error. + fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error> + where + A: SeqAccess<'de>, + { + let _ = seq; + Err(Error::invalid_type(Unexpected::Seq, &self)) + } + + /// The input contains a key-value map. + /// + /// The default implementation fails with a type error. + fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + let _ = map; + Err(Error::invalid_type(Unexpected::Map, &self)) + } + + /// The input contains an enum. + /// + /// The default implementation fails with a type error. + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + let _ = data; + Err(Error::invalid_type(Unexpected::Enum, &self)) + } + + // Used when deserializing a flattened Option field. Not public API. + #[doc(hidden)] + fn __private_visit_untagged_option<D>(self, _: D) -> Result<Self::Value, ()> + where + D: Deserializer<'de>, + { + Err(()) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// Provides a `Visitor` access to each element of a sequence in the input. +/// +/// This is a trait that a `Deserializer` passes to a `Visitor` implementation, +/// which deserializes each item in a sequence. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed by deserialized sequence elements. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SeqAccess` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SeqAccess<'de> { + /// The error type that can be returned if some error occurs during + /// deserialization. + type Error: Error; + + /// This returns `Ok(Some(value))` for the next value in the sequence, or + /// `Ok(None)` if there are no more remaining items. + /// + /// `Deserialize` implementations should typically use + /// `SeqAccess::next_element` instead. + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: DeserializeSeed<'de>; + + /// This returns `Ok(Some(value))` for the next value in the sequence, or + /// `Ok(None)` if there are no more remaining items. + /// + /// This method exists as a convenience for `Deserialize` implementations. + /// `SeqAccess` implementations should not override the default behavior. + #[inline] + fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error> + where + T: Deserialize<'de>, + { + self.next_element_seed(PhantomData) + } + + /// Returns the number of elements remaining in the sequence, if known. + #[inline] + fn size_hint(&self) -> Option<usize> { + None + } +} + +impl<'de, 'a, A: ?Sized> SeqAccess<'de> for &'a mut A +where + A: SeqAccess<'de>, +{ + type Error = A::Error; + + #[inline] + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: DeserializeSeed<'de>, + { + (**self).next_element_seed(seed) + } + + #[inline] + fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error> + where + T: Deserialize<'de>, + { + (**self).next_element() + } + + #[inline] + fn size_hint(&self) -> Option<usize> { + (**self).size_hint() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// Provides a `Visitor` access to each entry of a map in the input. +/// +/// This is a trait that a `Deserializer` passes to a `Visitor` implementation. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed by deserialized map entries. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `MapAccess` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait MapAccess<'de> { + /// The error type that can be returned if some error occurs during + /// deserialization. + type Error: Error; + + /// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)` + /// if there are no more remaining entries. + /// + /// `Deserialize` implementations should typically use + /// `MapAccess::next_key` or `MapAccess::next_entry` instead. + fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Self::Error> + where + K: DeserializeSeed<'de>; + + /// This returns a `Ok(value)` for the next value in the map. + /// + /// `Deserialize` implementations should typically use + /// `MapAccess::next_value` instead. + /// + /// # Panics + /// + /// Calling `next_value_seed` before `next_key_seed` is incorrect and is + /// allowed to panic or return bogus results. + fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error> + where + V: DeserializeSeed<'de>; + + /// This returns `Ok(Some((key, value)))` for the next (key-value) pair in + /// the map, or `Ok(None)` if there are no more remaining items. + /// + /// `MapAccess` implementations should override the default behavior if a + /// more efficient implementation is possible. + /// + /// `Deserialize` implementations should typically use + /// `MapAccess::next_entry` instead. + #[inline] + fn next_entry_seed<K, V>( + &mut self, + kseed: K, + vseed: V, + ) -> Result<Option<(K::Value, V::Value)>, Self::Error> + where + K: DeserializeSeed<'de>, + V: DeserializeSeed<'de>, + { + match try!(self.next_key_seed(kseed)) { + Some(key) => { + let value = try!(self.next_value_seed(vseed)); + Ok(Some((key, value))) + } + None => Ok(None), + } + } + + /// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)` + /// if there are no more remaining entries. + /// + /// This method exists as a convenience for `Deserialize` implementations. + /// `MapAccess` implementations should not override the default behavior. + #[inline] + fn next_key<K>(&mut self) -> Result<Option<K>, Self::Error> + where + K: Deserialize<'de>, + { + self.next_key_seed(PhantomData) + } + + /// This returns a `Ok(value)` for the next value in the map. + /// + /// This method exists as a convenience for `Deserialize` implementations. + /// `MapAccess` implementations should not override the default behavior. + /// + /// # Panics + /// + /// Calling `next_value` before `next_key` is incorrect and is allowed to + /// panic or return bogus results. + #[inline] + fn next_value<V>(&mut self) -> Result<V, Self::Error> + where + V: Deserialize<'de>, + { + self.next_value_seed(PhantomData) + } + + /// This returns `Ok(Some((key, value)))` for the next (key-value) pair in + /// the map, or `Ok(None)` if there are no more remaining items. + /// + /// This method exists as a convenience for `Deserialize` implementations. + /// `MapAccess` implementations should not override the default behavior. + #[inline] + fn next_entry<K, V>(&mut self) -> Result<Option<(K, V)>, Self::Error> + where + K: Deserialize<'de>, + V: Deserialize<'de>, + { + self.next_entry_seed(PhantomData, PhantomData) + } + + /// Returns the number of entries remaining in the map, if known. + #[inline] + fn size_hint(&self) -> Option<usize> { + None + } +} + +impl<'de, 'a, A: ?Sized> MapAccess<'de> for &'a mut A +where + A: MapAccess<'de>, +{ + type Error = A::Error; + + #[inline] + fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Self::Error> + where + K: DeserializeSeed<'de>, + { + (**self).next_key_seed(seed) + } + + #[inline] + fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error> + where + V: DeserializeSeed<'de>, + { + (**self).next_value_seed(seed) + } + + #[inline] + fn next_entry_seed<K, V>( + &mut self, + kseed: K, + vseed: V, + ) -> Result<Option<(K::Value, V::Value)>, Self::Error> + where + K: DeserializeSeed<'de>, + V: DeserializeSeed<'de>, + { + (**self).next_entry_seed(kseed, vseed) + } + + #[inline] + fn next_entry<K, V>(&mut self) -> Result<Option<(K, V)>, Self::Error> + where + K: Deserialize<'de>, + V: Deserialize<'de>, + { + (**self).next_entry() + } + + #[inline] + fn next_key<K>(&mut self) -> Result<Option<K>, Self::Error> + where + K: Deserialize<'de>, + { + (**self).next_key() + } + + #[inline] + fn next_value<V>(&mut self) -> Result<V, Self::Error> + where + V: Deserialize<'de>, + { + (**self).next_value() + } + + #[inline] + fn size_hint(&self) -> Option<usize> { + (**self).size_hint() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// Provides a `Visitor` access to the data of an enum in the input. +/// +/// `EnumAccess` is created by the `Deserializer` and passed to the +/// `Visitor` in order to identify which variant of an enum to deserialize. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed by the deserialized enum variant. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `EnumAccess` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait EnumAccess<'de>: Sized { + /// The error type that can be returned if some error occurs during + /// deserialization. + type Error: Error; + /// The `Visitor` that will be used to deserialize the content of the enum + /// variant. + type Variant: VariantAccess<'de, Error = Self::Error>; + + /// `variant` is called to identify which variant to deserialize. + /// + /// `Deserialize` implementations should typically use `EnumAccess::variant` + /// instead. + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error> + where + V: DeserializeSeed<'de>; + + /// `variant` is called to identify which variant to deserialize. + /// + /// This method exists as a convenience for `Deserialize` implementations. + /// `EnumAccess` implementations should not override the default behavior. + #[inline] + fn variant<V>(self) -> Result<(V, Self::Variant), Self::Error> + where + V: Deserialize<'de>, + { + self.variant_seed(PhantomData) + } +} + +/// `VariantAccess` is a visitor that is created by the `Deserializer` and +/// passed to the `Deserialize` to deserialize the content of a particular enum +/// variant. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed by the deserialized enum variant. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `VariantAccess` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait VariantAccess<'de>: Sized { + /// The error type that can be returned if some error occurs during + /// deserialization. Must match the error type of our `EnumAccess`. + type Error: Error; + + /// Called when deserializing a variant with no values. + /// + /// If the data contains a different type of variant, the following + /// `invalid_type` error should be constructed: + /// + /// ```edition2018 + /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; + /// # + /// # struct X; + /// # + /// # impl<'de> VariantAccess<'de> for X { + /// # type Error = value::Error; + /// # + /// fn unit_variant(self) -> Result<(), Self::Error> { + /// // What the data actually contained; suppose it is a tuple variant. + /// let unexp = Unexpected::TupleVariant; + /// Err(de::Error::invalid_type(unexp, &"unit variant")) + /// } + /// # + /// # fn newtype_variant_seed<T>(self, _: T) -> Result<T::Value, Self::Error> + /// # where + /// # T: DeserializeSeed<'de>, + /// # { unimplemented!() } + /// # + /// # fn tuple_variant<V>(self, _: usize, _: V) -> Result<V::Value, Self::Error> + /// # where + /// # V: Visitor<'de>, + /// # { unimplemented!() } + /// # + /// # fn struct_variant<V>(self, _: &[&str], _: V) -> Result<V::Value, Self::Error> + /// # where + /// # V: Visitor<'de>, + /// # { unimplemented!() } + /// # } + /// ``` + fn unit_variant(self) -> Result<(), Self::Error>; + + /// Called when deserializing a variant with a single value. + /// + /// `Deserialize` implementations should typically use + /// `VariantAccess::newtype_variant` instead. + /// + /// If the data contains a different type of variant, the following + /// `invalid_type` error should be constructed: + /// + /// ```edition2018 + /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; + /// # + /// # struct X; + /// # + /// # impl<'de> VariantAccess<'de> for X { + /// # type Error = value::Error; + /// # + /// # fn unit_variant(self) -> Result<(), Self::Error> { + /// # unimplemented!() + /// # } + /// # + /// fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error> + /// where + /// T: DeserializeSeed<'de>, + /// { + /// // What the data actually contained; suppose it is a unit variant. + /// let unexp = Unexpected::UnitVariant; + /// Err(de::Error::invalid_type(unexp, &"newtype variant")) + /// } + /// # + /// # fn tuple_variant<V>(self, _: usize, _: V) -> Result<V::Value, Self::Error> + /// # where + /// # V: Visitor<'de>, + /// # { unimplemented!() } + /// # + /// # fn struct_variant<V>(self, _: &[&str], _: V) -> Result<V::Value, Self::Error> + /// # where + /// # V: Visitor<'de>, + /// # { unimplemented!() } + /// # } + /// ``` + fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Self::Error> + where + T: DeserializeSeed<'de>; + + /// Called when deserializing a variant with a single value. + /// + /// This method exists as a convenience for `Deserialize` implementations. + /// `VariantAccess` implementations should not override the default + /// behavior. + #[inline] + fn newtype_variant<T>(self) -> Result<T, Self::Error> + where + T: Deserialize<'de>, + { + self.newtype_variant_seed(PhantomData) + } + + /// Called when deserializing a tuple-like variant. + /// + /// The `len` is the number of fields expected in the tuple variant. + /// + /// If the data contains a different type of variant, the following + /// `invalid_type` error should be constructed: + /// + /// ```edition2018 + /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; + /// # + /// # struct X; + /// # + /// # impl<'de> VariantAccess<'de> for X { + /// # type Error = value::Error; + /// # + /// # fn unit_variant(self) -> Result<(), Self::Error> { + /// # unimplemented!() + /// # } + /// # + /// # fn newtype_variant_seed<T>(self, _: T) -> Result<T::Value, Self::Error> + /// # where + /// # T: DeserializeSeed<'de>, + /// # { unimplemented!() } + /// # + /// fn tuple_variant<V>( + /// self, + /// _len: usize, + /// _visitor: V, + /// ) -> Result<V::Value, Self::Error> + /// where + /// V: Visitor<'de>, + /// { + /// // What the data actually contained; suppose it is a unit variant. + /// let unexp = Unexpected::UnitVariant; + /// Err(de::Error::invalid_type(unexp, &"tuple variant")) + /// } + /// # + /// # fn struct_variant<V>(self, _: &[&str], _: V) -> Result<V::Value, Self::Error> + /// # where + /// # V: Visitor<'de>, + /// # { unimplemented!() } + /// # } + /// ``` + fn tuple_variant<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; + + /// Called when deserializing a struct-like variant. + /// + /// The `fields` are the names of the fields of the struct variant. + /// + /// If the data contains a different type of variant, the following + /// `invalid_type` error should be constructed: + /// + /// ```edition2018 + /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; + /// # + /// # struct X; + /// # + /// # impl<'de> VariantAccess<'de> for X { + /// # type Error = value::Error; + /// # + /// # fn unit_variant(self) -> Result<(), Self::Error> { + /// # unimplemented!() + /// # } + /// # + /// # fn newtype_variant_seed<T>(self, _: T) -> Result<T::Value, Self::Error> + /// # where + /// # T: DeserializeSeed<'de>, + /// # { unimplemented!() } + /// # + /// # fn tuple_variant<V>(self, _: usize, _: V) -> Result<V::Value, Self::Error> + /// # where + /// # V: Visitor<'de>, + /// # { unimplemented!() } + /// # + /// fn struct_variant<V>( + /// self, + /// _fields: &'static [&'static str], + /// _visitor: V, + /// ) -> Result<V::Value, Self::Error> + /// where + /// V: Visitor<'de>, + /// { + /// // What the data actually contained; suppose it is a unit variant. + /// let unexp = Unexpected::UnitVariant; + /// Err(de::Error::invalid_type(unexp, &"struct variant")) + /// } + /// # } + /// ``` + fn struct_variant<V>( + self, + fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>; +} + +//////////////////////////////////////////////////////////////////////////////// + +/// Converts an existing value into a `Deserializer` from which other values can +/// be deserialized. +/// +/// # Lifetime +/// +/// The `'de` lifetime of this trait is the lifetime of data that may be +/// borrowed from the resulting `Deserializer`. See the page [Understanding +/// deserializer lifetimes] for a more detailed explanation of these lifetimes. +/// +/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html +/// +/// # Example +/// +/// ```edition2018 +/// use std::str::FromStr; +/// use serde::Deserialize; +/// use serde::de::{value, IntoDeserializer}; +/// +/// #[derive(Deserialize)] +/// enum Setting { +/// On, +/// Off, +/// } +/// +/// impl FromStr for Setting { +/// type Err = value::Error; +/// +/// fn from_str(s: &str) -> Result<Self, Self::Err> { +/// Self::deserialize(s.into_deserializer()) +/// } +/// } +/// ``` +pub trait IntoDeserializer<'de, E: Error = value::Error> { + /// The type of the deserializer being converted into. + type Deserializer: Deserializer<'de, Error = E>; + + /// Convert this value into a deserializer. + fn into_deserializer(self) -> Self::Deserializer; +} + +//////////////////////////////////////////////////////////////////////////////// + +/// Used in error messages. +/// +/// - expected `a` +/// - expected `a` or `b` +/// - expected one of `a`, `b`, `c` +/// +/// The slice of names must not be empty. +struct OneOf { + names: &'static [&'static str], +} + +impl Display for OneOf { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + match self.names.len() { + 0 => panic!(), // special case elsewhere + 1 => write!(formatter, "`{}`", self.names[0]), + 2 => write!(formatter, "`{}` or `{}`", self.names[0], self.names[1]), + _ => { + try!(write!(formatter, "one of ")); + for (i, alt) in self.names.iter().enumerate() { + if i > 0 { + try!(write!(formatter, ", ")); + } + try!(write!(formatter, "`{}`", alt)); + } + Ok(()) + } + } + } +} diff --git a/vendor/serde/src/de/seed.rs b/vendor/serde/src/de/seed.rs new file mode 100644 index 000000000..13b7ea461 --- /dev/null +++ b/vendor/serde/src/de/seed.rs @@ -0,0 +1,19 @@ +use de::{Deserialize, DeserializeSeed, Deserializer}; + +/// A DeserializeSeed helper for implementing deserialize_in_place Visitors. +/// +/// Wraps a mutable reference and calls deserialize_in_place on it. +pub struct InPlaceSeed<'a, T: 'a>(pub &'a mut T); + +impl<'a, 'de, T> DeserializeSeed<'de> for InPlaceSeed<'a, T> +where + T: Deserialize<'de>, +{ + type Value = (); + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + T::deserialize_in_place(deserializer, self.0) + } +} diff --git a/vendor/serde/src/de/utf8.rs b/vendor/serde/src/de/utf8.rs new file mode 100644 index 000000000..576fd03cf --- /dev/null +++ b/vendor/serde/src/de/utf8.rs @@ -0,0 +1,46 @@ +use lib::*; + +const TAG_CONT: u8 = 0b1000_0000; +const TAG_TWO_B: u8 = 0b1100_0000; +const TAG_THREE_B: u8 = 0b1110_0000; +const TAG_FOUR_B: u8 = 0b1111_0000; +const MAX_ONE_B: u32 = 0x80; +const MAX_TWO_B: u32 = 0x800; +const MAX_THREE_B: u32 = 0x10000; + +#[inline] +pub fn encode(c: char) -> Encode { + let code = c as u32; + let mut buf = [0; 4]; + let pos = if code < MAX_ONE_B { + buf[3] = code as u8; + 3 + } else if code < MAX_TWO_B { + buf[2] = (code >> 6 & 0x1F) as u8 | TAG_TWO_B; + buf[3] = (code & 0x3F) as u8 | TAG_CONT; + 2 + } else if code < MAX_THREE_B { + buf[1] = (code >> 12 & 0x0F) as u8 | TAG_THREE_B; + buf[2] = (code >> 6 & 0x3F) as u8 | TAG_CONT; + buf[3] = (code & 0x3F) as u8 | TAG_CONT; + 1 + } else { + buf[0] = (code >> 18 & 0x07) as u8 | TAG_FOUR_B; + buf[1] = (code >> 12 & 0x3F) as u8 | TAG_CONT; + buf[2] = (code >> 6 & 0x3F) as u8 | TAG_CONT; + buf[3] = (code & 0x3F) as u8 | TAG_CONT; + 0 + }; + Encode { buf: buf, pos: pos } +} + +pub struct Encode { + buf: [u8; 4], + pos: usize, +} + +impl Encode { + pub fn as_str(&self) -> &str { + str::from_utf8(&self.buf[self.pos..]).unwrap() + } +} diff --git a/vendor/serde/src/de/value.rs b/vendor/serde/src/de/value.rs new file mode 100644 index 000000000..e7afdd8d1 --- /dev/null +++ b/vendor/serde/src/de/value.rs @@ -0,0 +1,1679 @@ +//! Building blocks for deserializing basic values using the `IntoDeserializer` +//! trait. +//! +//! ```edition2018 +//! use std::str::FromStr; +//! use serde::Deserialize; +//! use serde::de::{value, IntoDeserializer}; +//! +//! #[derive(Deserialize)] +//! enum Setting { +//! On, +//! Off, +//! } +//! +//! impl FromStr for Setting { +//! type Err = value::Error; +//! +//! fn from_str(s: &str) -> Result<Self, Self::Err> { +//! Self::deserialize(s.into_deserializer()) +//! } +//! } +//! ``` + +use lib::*; + +use self::private::{First, Second}; +use __private::size_hint; +use de::{self, Deserializer, Expected, IntoDeserializer, SeqAccess, Visitor}; +use ser; + +//////////////////////////////////////////////////////////////////////////////// + +// For structs that contain a PhantomData. We do not want the trait +// bound `E: Clone` inferred by derive(Clone). +macro_rules! impl_copy_clone { + ($ty:ident $(<$lifetime:tt>)*) => { + impl<$($lifetime,)* E> Copy for $ty<$($lifetime,)* E> {} + + impl<$($lifetime,)* E> Clone for $ty<$($lifetime,)* E> { + fn clone(&self) -> Self { + *self + } + } + }; +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A minimal representation of all possible errors that can occur using the +/// `IntoDeserializer` trait. +#[derive(Clone, PartialEq)] +pub struct Error { + err: ErrorImpl, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +type ErrorImpl = Box<str>; +#[cfg(not(any(feature = "std", feature = "alloc")))] +type ErrorImpl = (); + +impl de::Error for Error { + #[cfg(any(feature = "std", feature = "alloc"))] + #[cold] + fn custom<T>(msg: T) -> Self + where + T: Display, + { + Error { + err: msg.to_string().into_boxed_str(), + } + } + + #[cfg(not(any(feature = "std", feature = "alloc")))] + #[cold] + fn custom<T>(msg: T) -> Self + where + T: Display, + { + let _ = msg; + Error { err: () } + } +} + +impl ser::Error for Error { + #[cold] + fn custom<T>(msg: T) -> Self + where + T: Display, + { + de::Error::custom(msg) + } +} + +impl Display for Error { + #[cfg(any(feature = "std", feature = "alloc"))] + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(&self.err) + } + + #[cfg(not(any(feature = "std", feature = "alloc")))] + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("Serde deserialization error") + } +} + +impl Debug for Error { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + let mut debug = formatter.debug_tuple("Error"); + #[cfg(any(feature = "std", feature = "alloc"))] + debug.field(&self.err); + debug.finish() + } +} + +#[cfg(feature = "std")] +impl error::Error for Error { + fn description(&self) -> &str { + &self.err + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<'de, E> IntoDeserializer<'de, E> for () +where + E: de::Error, +{ + type Deserializer = UnitDeserializer<E>; + + fn into_deserializer(self) -> UnitDeserializer<E> { + UnitDeserializer::new() + } +} + +/// A deserializer holding a `()`. +pub struct UnitDeserializer<E> { + marker: PhantomData<E>, +} + +impl_copy_clone!(UnitDeserializer); + +impl<E> UnitDeserializer<E> { + #[allow(missing_docs)] + pub fn new() -> Self { + UnitDeserializer { + marker: PhantomData, + } + } +} + +impl<'de, E> de::Deserializer<'de> for UnitDeserializer<E> +where + E: de::Error, +{ + type Error = E; + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf unit unit_struct newtype_struct seq tuple tuple_struct + map struct enum identifier ignored_any + } + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_unit() + } + + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_none() + } +} + +impl<E> Debug for UnitDeserializer<E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.debug_struct("UnitDeserializer").finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer that cannot be instantiated. +#[cfg(feature = "unstable")] +pub struct NeverDeserializer<E> { + never: !, + marker: PhantomData<E>, +} + +#[cfg(feature = "unstable")] +impl<'de, E> IntoDeserializer<'de, E> for ! +where + E: de::Error, +{ + type Deserializer = NeverDeserializer<E>; + + fn into_deserializer(self) -> Self::Deserializer { + self + } +} + +#[cfg(feature = "unstable")] +impl<'de, E> de::Deserializer<'de> for NeverDeserializer<E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + self.never + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! primitive_deserializer { + ($ty:ty, $doc:tt, $name:ident, $method:ident $($cast:tt)*) => { + #[doc = "A deserializer holding"] + #[doc = $doc] + pub struct $name<E> { + value: $ty, + marker: PhantomData<E> + } + + impl_copy_clone!($name); + + impl<'de, E> IntoDeserializer<'de, E> for $ty + where + E: de::Error, + { + type Deserializer = $name<E>; + + fn into_deserializer(self) -> $name<E> { + $name::new(self) + } + } + + impl<E> $name<E> { + #[allow(missing_docs)] + pub fn new(value: $ty) -> Self { + $name { + value: value, + marker: PhantomData, + } + } + } + + impl<'de, E> de::Deserializer<'de> for $name<E> + where + E: de::Error, + { + type Error = E; + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str + string bytes byte_buf option unit unit_struct newtype_struct seq + tuple tuple_struct map struct enum identifier ignored_any + } + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.$method(self.value $($cast)*) + } + } + + impl<E> Debug for $name<E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct(stringify!($name)) + .field("value", &self.value) + .finish() + } + } + } +} + +primitive_deserializer!(bool, "a `bool`.", BoolDeserializer, visit_bool); +primitive_deserializer!(i8, "an `i8`.", I8Deserializer, visit_i8); +primitive_deserializer!(i16, "an `i16`.", I16Deserializer, visit_i16); +primitive_deserializer!(i32, "an `i32`.", I32Deserializer, visit_i32); +primitive_deserializer!(i64, "an `i64`.", I64Deserializer, visit_i64); +primitive_deserializer!(isize, "an `isize`.", IsizeDeserializer, visit_i64 as i64); +primitive_deserializer!(u8, "a `u8`.", U8Deserializer, visit_u8); +primitive_deserializer!(u16, "a `u16`.", U16Deserializer, visit_u16); +primitive_deserializer!(u64, "a `u64`.", U64Deserializer, visit_u64); +primitive_deserializer!(usize, "a `usize`.", UsizeDeserializer, visit_u64 as u64); +primitive_deserializer!(f32, "an `f32`.", F32Deserializer, visit_f32); +primitive_deserializer!(f64, "an `f64`.", F64Deserializer, visit_f64); +primitive_deserializer!(char, "a `char`.", CharDeserializer, visit_char); + +serde_if_integer128! { + primitive_deserializer!(i128, "an `i128`.", I128Deserializer, visit_i128); + primitive_deserializer!(u128, "a `u128`.", U128Deserializer, visit_u128); +} + +/// A deserializer holding a `u32`. +pub struct U32Deserializer<E> { + value: u32, + marker: PhantomData<E>, +} + +impl_copy_clone!(U32Deserializer); + +impl<'de, E> IntoDeserializer<'de, E> for u32 +where + E: de::Error, +{ + type Deserializer = U32Deserializer<E>; + + fn into_deserializer(self) -> U32Deserializer<E> { + U32Deserializer::new(self) + } +} + +impl<E> U32Deserializer<E> { + #[allow(missing_docs)] + pub fn new(value: u32) -> Self { + U32Deserializer { + value: value, + marker: PhantomData, + } + } +} + +impl<'de, E> de::Deserializer<'de> for U32Deserializer<E> +where + E: de::Error, +{ + type Error = E; + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_u32(self.value) + } + + fn deserialize_enum<V>( + self, + name: &str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let _ = name; + let _ = variants; + visitor.visit_enum(self) + } +} + +impl<'de, E> de::EnumAccess<'de> for U32Deserializer<E> +where + E: de::Error, +{ + type Error = E; + type Variant = private::UnitOnly<E>; + + fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> + where + T: de::DeserializeSeed<'de>, + { + seed.deserialize(self).map(private::unit_only) + } +} + +impl<E> Debug for U32Deserializer<E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("U32Deserializer") + .field("value", &self.value) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `&str`. +pub struct StrDeserializer<'a, E> { + value: &'a str, + marker: PhantomData<E>, +} + +impl_copy_clone!(StrDeserializer<'de>); + +impl<'de, 'a, E> IntoDeserializer<'de, E> for &'a str +where + E: de::Error, +{ + type Deserializer = StrDeserializer<'a, E>; + + fn into_deserializer(self) -> StrDeserializer<'a, E> { + StrDeserializer::new(self) + } +} + +impl<'a, E> StrDeserializer<'a, E> { + #[allow(missing_docs)] + pub fn new(value: &'a str) -> Self { + StrDeserializer { + value: value, + marker: PhantomData, + } + } +} + +impl<'de, 'a, E> de::Deserializer<'de> for StrDeserializer<'a, E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_str(self.value) + } + + fn deserialize_enum<V>( + self, + name: &str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let _ = name; + let _ = variants; + visitor.visit_enum(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +impl<'de, 'a, E> de::EnumAccess<'de> for StrDeserializer<'a, E> +where + E: de::Error, +{ + type Error = E; + type Variant = private::UnitOnly<E>; + + fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> + where + T: de::DeserializeSeed<'de>, + { + seed.deserialize(self).map(private::unit_only) + } +} + +impl<'a, E> Debug for StrDeserializer<'a, E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("StrDeserializer") + .field("value", &self.value) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `&str` with a lifetime tied to another +/// deserializer. +pub struct BorrowedStrDeserializer<'de, E> { + value: &'de str, + marker: PhantomData<E>, +} + +impl_copy_clone!(BorrowedStrDeserializer<'de>); + +impl<'de, E> BorrowedStrDeserializer<'de, E> { + /// Create a new borrowed deserializer from the given string. + pub fn new(value: &'de str) -> BorrowedStrDeserializer<'de, E> { + BorrowedStrDeserializer { + value: value, + marker: PhantomData, + } + } +} + +impl<'de, E> de::Deserializer<'de> for BorrowedStrDeserializer<'de, E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_borrowed_str(self.value) + } + + fn deserialize_enum<V>( + self, + name: &str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let _ = name; + let _ = variants; + visitor.visit_enum(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +impl<'de, E> de::EnumAccess<'de> for BorrowedStrDeserializer<'de, E> +where + E: de::Error, +{ + type Error = E; + type Variant = private::UnitOnly<E>; + + fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> + where + T: de::DeserializeSeed<'de>, + { + seed.deserialize(self).map(private::unit_only) + } +} + +impl<'de, E> Debug for BorrowedStrDeserializer<'de, E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("BorrowedStrDeserializer") + .field("value", &self.value) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `String`. +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct StringDeserializer<E> { + value: String, + marker: PhantomData<E>, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<E> Clone for StringDeserializer<E> { + fn clone(&self) -> Self { + StringDeserializer { + value: self.value.clone(), + marker: PhantomData, + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, E> IntoDeserializer<'de, E> for String +where + E: de::Error, +{ + type Deserializer = StringDeserializer<E>; + + fn into_deserializer(self) -> StringDeserializer<E> { + StringDeserializer::new(self) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<E> StringDeserializer<E> { + #[allow(missing_docs)] + pub fn new(value: String) -> Self { + StringDeserializer { + value: value, + marker: PhantomData, + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, E> de::Deserializer<'de> for StringDeserializer<E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_string(self.value) + } + + fn deserialize_enum<V>( + self, + name: &str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let _ = name; + let _ = variants; + visitor.visit_enum(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, E> de::EnumAccess<'de> for StringDeserializer<E> +where + E: de::Error, +{ + type Error = E; + type Variant = private::UnitOnly<E>; + + fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> + where + T: de::DeserializeSeed<'de>, + { + seed.deserialize(self).map(private::unit_only) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<E> Debug for StringDeserializer<E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("StringDeserializer") + .field("value", &self.value) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `Cow<str>`. +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct CowStrDeserializer<'a, E> { + value: Cow<'a, str>, + marker: PhantomData<E>, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, E> Clone for CowStrDeserializer<'a, E> { + fn clone(&self) -> Self { + CowStrDeserializer { + value: self.value.clone(), + marker: PhantomData, + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str> +where + E: de::Error, +{ + type Deserializer = CowStrDeserializer<'a, E>; + + fn into_deserializer(self) -> CowStrDeserializer<'a, E> { + CowStrDeserializer::new(self) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, E> CowStrDeserializer<'a, E> { + #[allow(missing_docs)] + pub fn new(value: Cow<'a, str>) -> Self { + CowStrDeserializer { + value: value, + marker: PhantomData, + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, 'a, E> de::Deserializer<'de> for CowStrDeserializer<'a, E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + match self.value { + Cow::Borrowed(string) => visitor.visit_str(string), + Cow::Owned(string) => visitor.visit_string(string), + } + } + + fn deserialize_enum<V>( + self, + name: &str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let _ = name; + let _ = variants; + visitor.visit_enum(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, 'a, E> de::EnumAccess<'de> for CowStrDeserializer<'a, E> +where + E: de::Error, +{ + type Error = E; + type Variant = private::UnitOnly<E>; + + fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> + where + T: de::DeserializeSeed<'de>, + { + seed.deserialize(self).map(private::unit_only) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, E> Debug for CowStrDeserializer<'a, E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("CowStrDeserializer") + .field("value", &self.value) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `&[u8]`. Always calls [`Visitor::visit_bytes`]. +pub struct BytesDeserializer<'a, E> { + value: &'a [u8], + marker: PhantomData<E>, +} + +impl<'a, E> BytesDeserializer<'a, E> { + /// Create a new deserializer from the given bytes. + pub fn new(value: &'a [u8]) -> Self { + BytesDeserializer { + value: value, + marker: PhantomData, + } + } +} + +impl_copy_clone!(BytesDeserializer<'a>); + +impl<'de, 'a, E> IntoDeserializer<'de, E> for &'a [u8] +where + E: de::Error, +{ + type Deserializer = BytesDeserializer<'a, E>; + + fn into_deserializer(self) -> BytesDeserializer<'a, E> { + BytesDeserializer::new(self) + } +} + +impl<'de, 'a, E> Deserializer<'de> for BytesDeserializer<'a, E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_bytes(self.value) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +impl<'a, E> Debug for BytesDeserializer<'a, E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("BytesDeserializer") + .field("value", &self.value) + .finish() + } +} + +/// A deserializer holding a `&[u8]` with a lifetime tied to another +/// deserializer. Always calls [`Visitor::visit_borrowed_bytes`]. +pub struct BorrowedBytesDeserializer<'de, E> { + value: &'de [u8], + marker: PhantomData<E>, +} + +impl<'de, E> BorrowedBytesDeserializer<'de, E> { + /// Create a new borrowed deserializer from the given borrowed bytes. + pub fn new(value: &'de [u8]) -> Self { + BorrowedBytesDeserializer { + value: value, + marker: PhantomData, + } + } +} + +impl_copy_clone!(BorrowedBytesDeserializer<'de>); + +impl<'de, E> Deserializer<'de> for BorrowedBytesDeserializer<'de, E> +where + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_borrowed_bytes(self.value) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +impl<'de, E> Debug for BorrowedBytesDeserializer<'de, E> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("BorrowedBytesDeserializer") + .field("value", &self.value) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer that iterates over a sequence. +#[derive(Clone)] +pub struct SeqDeserializer<I, E> { + iter: iter::Fuse<I>, + count: usize, + marker: PhantomData<E>, +} + +impl<I, E> SeqDeserializer<I, E> +where + I: Iterator, +{ + /// Construct a new `SeqDeserializer<I, E>`. + pub fn new(iter: I) -> Self { + SeqDeserializer { + iter: iter.fuse(), + count: 0, + marker: PhantomData, + } + } +} + +impl<I, E> SeqDeserializer<I, E> +where + I: Iterator, + E: de::Error, +{ + /// Check for remaining elements after passing a `SeqDeserializer` to + /// `Visitor::visit_seq`. + pub fn end(self) -> Result<(), E> { + let remaining = self.iter.count(); + if remaining == 0 { + Ok(()) + } else { + // First argument is the number of elements in the data, second + // argument is the number of elements expected by the Deserialize. + Err(de::Error::invalid_length( + self.count + remaining, + &ExpectedInSeq(self.count), + )) + } + } +} + +impl<'de, I, T, E> de::Deserializer<'de> for SeqDeserializer<I, E> +where + I: Iterator<Item = T>, + T: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let v = try!(visitor.visit_seq(&mut self)); + try!(self.end()); + Ok(v) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +impl<'de, I, T, E> de::SeqAccess<'de> for SeqDeserializer<I, E> +where + I: Iterator<Item = T>, + T: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + fn next_element_seed<V>(&mut self, seed: V) -> Result<Option<V::Value>, Self::Error> + where + V: de::DeserializeSeed<'de>, + { + match self.iter.next() { + Some(value) => { + self.count += 1; + seed.deserialize(value.into_deserializer()).map(Some) + } + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } +} + +struct ExpectedInSeq(usize); + +impl Expected for ExpectedInSeq { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + if self.0 == 1 { + write!(formatter, "1 element in sequence") + } else { + write!(formatter, "{} elements in sequence", self.0) + } + } +} + +impl<I, E> Debug for SeqDeserializer<I, E> +where + I: Debug, +{ + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("SeqDeserializer") + .field("iter", &self.iter) + .field("count", &self.count) + .finish() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, T, E> IntoDeserializer<'de, E> for Vec<T> +where + T: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>; + + fn into_deserializer(self) -> Self::Deserializer { + SeqDeserializer::new(self.into_iter()) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, T, E> IntoDeserializer<'de, E> for BTreeSet<T> +where + T: IntoDeserializer<'de, E> + Eq + Ord, + E: de::Error, +{ + type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>; + + fn into_deserializer(self) -> Self::Deserializer { + SeqDeserializer::new(self.into_iter()) + } +} + +#[cfg(feature = "std")] +impl<'de, T, S, E> IntoDeserializer<'de, E> for HashSet<T, S> +where + T: IntoDeserializer<'de, E> + Eq + Hash, + S: BuildHasher, + E: de::Error, +{ + type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>; + + fn into_deserializer(self) -> Self::Deserializer { + SeqDeserializer::new(self.into_iter()) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `SeqAccess`. +#[derive(Clone, Debug)] +pub struct SeqAccessDeserializer<A> { + seq: A, +} + +impl<A> SeqAccessDeserializer<A> { + /// Construct a new `SeqAccessDeserializer<A>`. + pub fn new(seq: A) -> Self { + SeqAccessDeserializer { seq: seq } + } +} + +impl<'de, A> de::Deserializer<'de> for SeqAccessDeserializer<A> +where + A: de::SeqAccess<'de>, +{ + type Error = A::Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_seq(self.seq) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer that iterates over a map. +pub struct MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, +{ + iter: iter::Fuse<I>, + value: Option<Second<I::Item>>, + count: usize, + lifetime: PhantomData<&'de ()>, + error: PhantomData<E>, +} + +impl<'de, I, E> MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, +{ + /// Construct a new `MapDeserializer<I, E>`. + pub fn new(iter: I) -> Self { + MapDeserializer { + iter: iter.fuse(), + value: None, + count: 0, + lifetime: PhantomData, + error: PhantomData, + } + } +} + +impl<'de, I, E> MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, + E: de::Error, +{ + /// Check for remaining elements after passing a `MapDeserializer` to + /// `Visitor::visit_map`. + pub fn end(self) -> Result<(), E> { + let remaining = self.iter.count(); + if remaining == 0 { + Ok(()) + } else { + // First argument is the number of elements in the data, second + // argument is the number of elements expected by the Deserialize. + Err(de::Error::invalid_length( + self.count + remaining, + &ExpectedInMap(self.count), + )) + } + } +} + +impl<'de, I, E> MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, +{ + fn next_pair(&mut self) -> Option<(First<I::Item>, Second<I::Item>)> { + match self.iter.next() { + Some(kv) => { + self.count += 1; + Some(private::Pair::split(kv)) + } + None => None, + } + } +} + +impl<'de, I, E> de::Deserializer<'de> for MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, + First<I::Item>: IntoDeserializer<'de, E>, + Second<I::Item>: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let value = try!(visitor.visit_map(&mut self)); + try!(self.end()); + Ok(value) + } + + fn deserialize_seq<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let value = try!(visitor.visit_seq(&mut self)); + try!(self.end()); + Ok(value) + } + + fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let _ = len; + self.deserialize_seq(visitor) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct tuple_struct map + struct enum identifier ignored_any + } +} + +impl<'de, I, E> de::MapAccess<'de> for MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, + First<I::Item>: IntoDeserializer<'de, E>, + Second<I::Item>: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.next_pair() { + Some((key, value)) => { + self.value = Some(value); + seed.deserialize(key.into_deserializer()).map(Some) + } + None => Ok(None), + } + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + let value = self.value.take(); + // Panic because this indicates a bug in the program rather than an + // expected failure. + let value = value.expect("MapAccess::next_value called before next_key"); + seed.deserialize(value.into_deserializer()) + } + + fn next_entry_seed<TK, TV>( + &mut self, + kseed: TK, + vseed: TV, + ) -> Result<Option<(TK::Value, TV::Value)>, Self::Error> + where + TK: de::DeserializeSeed<'de>, + TV: de::DeserializeSeed<'de>, + { + match self.next_pair() { + Some((key, value)) => { + let key = try!(kseed.deserialize(key.into_deserializer())); + let value = try!(vseed.deserialize(value.into_deserializer())); + Ok(Some((key, value))) + } + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } +} + +impl<'de, I, E> de::SeqAccess<'de> for MapDeserializer<'de, I, E> +where + I: Iterator, + I::Item: private::Pair, + First<I::Item>: IntoDeserializer<'de, E>, + Second<I::Item>: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.next_pair() { + Some((k, v)) => { + let de = PairDeserializer(k, v, PhantomData); + seed.deserialize(de).map(Some) + } + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } +} + +// Cannot #[derive(Clone)] because of the bound `Second<I::Item>: Clone`. +impl<'de, I, E> Clone for MapDeserializer<'de, I, E> +where + I: Iterator + Clone, + I::Item: private::Pair, + Second<I::Item>: Clone, +{ + fn clone(&self) -> Self { + MapDeserializer { + iter: self.iter.clone(), + value: self.value.clone(), + count: self.count, + lifetime: self.lifetime, + error: self.error, + } + } +} + +impl<'de, I, E> Debug for MapDeserializer<'de, I, E> +where + I: Iterator + Debug, + I::Item: private::Pair, + Second<I::Item>: Debug, +{ + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_struct("MapDeserializer") + .field("iter", &self.iter) + .field("value", &self.value) + .field("count", &self.count) + .finish() + } +} + +// Used in the `impl SeqAccess for MapDeserializer` to visit the map as a +// sequence of pairs. +struct PairDeserializer<A, B, E>(A, B, PhantomData<E>); + +impl<'de, A, B, E> de::Deserializer<'de> for PairDeserializer<A, B, E> +where + A: IntoDeserializer<'de, E>, + B: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct tuple_struct map + struct enum identifier ignored_any + } + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let mut pair_visitor = PairVisitor(Some(self.0), Some(self.1), PhantomData); + let pair = try!(visitor.visit_seq(&mut pair_visitor)); + if pair_visitor.1.is_none() { + Ok(pair) + } else { + let remaining = pair_visitor.size_hint().unwrap(); + // First argument is the number of elements in the data, second + // argument is the number of elements expected by the Deserialize. + Err(de::Error::invalid_length(2, &ExpectedInSeq(2 - remaining))) + } + } + + fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + if len == 2 { + self.deserialize_seq(visitor) + } else { + // First argument is the number of elements in the data, second + // argument is the number of elements expected by the Deserialize. + Err(de::Error::invalid_length(2, &ExpectedInSeq(len))) + } + } +} + +struct PairVisitor<A, B, E>(Option<A>, Option<B>, PhantomData<E>); + +impl<'de, A, B, E> de::SeqAccess<'de> for PairVisitor<A, B, E> +where + A: IntoDeserializer<'de, E>, + B: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Error = E; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + if let Some(k) = self.0.take() { + seed.deserialize(k.into_deserializer()).map(Some) + } else if let Some(v) = self.1.take() { + seed.deserialize(v.into_deserializer()).map(Some) + } else { + Ok(None) + } + } + + fn size_hint(&self) -> Option<usize> { + if self.0.is_some() { + Some(2) + } else if self.1.is_some() { + Some(1) + } else { + Some(0) + } + } +} + +struct ExpectedInMap(usize); + +impl Expected for ExpectedInMap { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + if self.0 == 1 { + write!(formatter, "1 element in map") + } else { + write!(formatter, "{} elements in map", self.0) + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'de, K, V, E> IntoDeserializer<'de, E> for BTreeMap<K, V> +where + K: IntoDeserializer<'de, E> + Eq + Ord, + V: IntoDeserializer<'de, E>, + E: de::Error, +{ + type Deserializer = MapDeserializer<'de, <Self as IntoIterator>::IntoIter, E>; + + fn into_deserializer(self) -> Self::Deserializer { + MapDeserializer::new(self.into_iter()) + } +} + +#[cfg(feature = "std")] +impl<'de, K, V, S, E> IntoDeserializer<'de, E> for HashMap<K, V, S> +where + K: IntoDeserializer<'de, E> + Eq + Hash, + V: IntoDeserializer<'de, E>, + S: BuildHasher, + E: de::Error, +{ + type Deserializer = MapDeserializer<'de, <Self as IntoIterator>::IntoIter, E>; + + fn into_deserializer(self) -> Self::Deserializer { + MapDeserializer::new(self.into_iter()) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A deserializer holding a `MapAccess`. +#[derive(Clone, Debug)] +pub struct MapAccessDeserializer<A> { + map: A, +} + +impl<A> MapAccessDeserializer<A> { + /// Construct a new `MapAccessDeserializer<A>`. + pub fn new(map: A) -> Self { + MapAccessDeserializer { map: map } + } +} + +impl<'de, A> de::Deserializer<'de> for MapAccessDeserializer<A> +where + A: de::MapAccess<'de>, +{ + type Error = A::Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_map(self.map) + } + + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_enum(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +impl<'de, A> de::EnumAccess<'de> for MapAccessDeserializer<A> +where + A: de::MapAccess<'de>, +{ + type Error = A::Error; + type Variant = private::MapAsEnum<A>; + + fn variant_seed<T>(mut self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.map.next_key_seed(seed)? { + Some(key) => Ok((key, private::map_as_enum(self.map))), + None => Err(de::Error::invalid_type(de::Unexpected::Map, &"enum")), + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +mod private { + use lib::*; + + use de::{self, DeserializeSeed, Deserializer, MapAccess, Unexpected, VariantAccess, Visitor}; + + pub struct UnitOnly<E> { + marker: PhantomData<E>, + } + + pub fn unit_only<T, E>(t: T) -> (T, UnitOnly<E>) { + ( + t, + UnitOnly { + marker: PhantomData, + }, + ) + } + + impl<'de, E> de::VariantAccess<'de> for UnitOnly<E> + where + E: de::Error, + { + type Error = E; + + fn unit_variant(self) -> Result<(), Self::Error> { + Ok(()) + } + + fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"newtype variant", + )) + } + + fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"tuple variant", + )) + } + + fn struct_variant<V>( + self, + _fields: &'static [&'static str], + _visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"struct variant", + )) + } + } + + pub struct MapAsEnum<A> { + map: A, + } + + pub fn map_as_enum<A>(map: A) -> MapAsEnum<A> { + MapAsEnum { map: map } + } + + impl<'de, A> VariantAccess<'de> for MapAsEnum<A> + where + A: MapAccess<'de>, + { + type Error = A::Error; + + fn unit_variant(mut self) -> Result<(), Self::Error> { + self.map.next_value() + } + + fn newtype_variant_seed<T>(mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: DeserializeSeed<'de>, + { + self.map.next_value_seed(seed) + } + + fn tuple_variant<V>(mut self, len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.map.next_value_seed(SeedTupleVariant { + len: len, + visitor: visitor, + }) + } + + fn struct_variant<V>( + mut self, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.map + .next_value_seed(SeedStructVariant { visitor: visitor }) + } + } + + struct SeedTupleVariant<V> { + len: usize, + visitor: V, + } + + impl<'de, V> DeserializeSeed<'de> for SeedTupleVariant<V> + where + V: Visitor<'de>, + { + type Value = V::Value; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_tuple(self.len, self.visitor) + } + } + + struct SeedStructVariant<V> { + visitor: V, + } + + impl<'de, V> DeserializeSeed<'de> for SeedStructVariant<V> + where + V: Visitor<'de>, + { + type Value = V::Value; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_map(self.visitor) + } + } + + /// Avoid having to restate the generic types on `MapDeserializer`. The + /// `Iterator::Item` contains enough information to figure out K and V. + pub trait Pair { + type First; + type Second; + fn split(self) -> (Self::First, Self::Second); + } + + impl<A, B> Pair for (A, B) { + type First = A; + type Second = B; + fn split(self) -> (A, B) { + self + } + } + + pub type First<T> = <T as Pair>::First; + pub type Second<T> = <T as Pair>::Second; +} diff --git a/vendor/serde/src/integer128.rs b/vendor/serde/src/integer128.rs new file mode 100644 index 000000000..904c2a233 --- /dev/null +++ b/vendor/serde/src/integer128.rs @@ -0,0 +1,82 @@ +/// Conditional compilation depending on whether Serde is built with support for +/// 128-bit integers. +/// +/// Data formats that wish to support Rust compiler versions older than 1.26 +/// (or targets that lack 128-bit integers) may place the i128 / u128 methods +/// of their Serializer and Deserializer behind this macro. +/// +/// Data formats that require a minimum Rust compiler version of at least 1.26, +/// or do not target platforms that lack 128-bit integers, do not need to +/// bother with this macro and may assume support for 128-bit integers. +/// +/// ```edition2018 +/// # use serde::__private::doc::Error; +/// # +/// # struct MySerializer; +/// # +/// use serde::{serde_if_integer128, Serializer}; +/// +/// impl Serializer for MySerializer { +/// type Ok = (); +/// type Error = Error; +/// +/// fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> { +/// /* ... */ +/// # unimplemented!() +/// } +/// +/// /* ... */ +/// +/// serde_if_integer128! { +/// fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> { +/// /* ... */ +/// # unimplemented!() +/// } +/// +/// fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> { +/// /* ... */ +/// # unimplemented!() +/// } +/// } +/// # +/// # serde::__serialize_unimplemented! { +/// # bool i8 i16 i32 u8 u16 u32 u64 f32 f64 char str bytes none some +/// # unit unit_struct unit_variant newtype_struct newtype_variant seq +/// # tuple tuple_struct tuple_variant map struct struct_variant +/// # } +/// } +/// ``` +/// +/// When Serde is built with support for 128-bit integers, this macro expands +/// transparently into just the input tokens. +/// +/// ```edition2018 +/// macro_rules! serde_if_integer128 { +/// ($($tt:tt)*) => { +/// $($tt)* +/// }; +/// } +/// ``` +/// +/// When built without support for 128-bit integers, this macro expands to +/// nothing. +/// +/// ```edition2018 +/// macro_rules! serde_if_integer128 { +/// ($($tt:tt)*) => {}; +/// } +/// ``` +#[cfg(not(no_integer128))] +#[macro_export] +macro_rules! serde_if_integer128 { + ($($tt:tt)*) => { + $($tt)* + }; +} + +#[cfg(no_integer128)] +#[macro_export] +#[doc(hidden)] +macro_rules! serde_if_integer128 { + ($($tt:tt)*) => {}; +} diff --git a/vendor/serde/src/lib.rs b/vendor/serde/src/lib.rs new file mode 100644 index 000000000..f1a17513c --- /dev/null +++ b/vendor/serde/src/lib.rs @@ -0,0 +1,303 @@ +//! # Serde +//! +//! Serde is a framework for ***ser***ializing and ***de***serializing Rust data +//! structures efficiently and generically. +//! +//! The Serde ecosystem consists of data structures that know how to serialize +//! and deserialize themselves along with data formats that know how to +//! serialize and deserialize other things. Serde provides the layer by which +//! these two groups interact with each other, allowing any supported data +//! structure to be serialized and deserialized using any supported data format. +//! +//! See the Serde website <https://serde.rs/> for additional documentation and +//! usage examples. +//! +//! ## Design +//! +//! Where many other languages rely on runtime reflection for serializing data, +//! Serde is instead built on Rust's powerful trait system. A data structure +//! that knows how to serialize and deserialize itself is one that implements +//! Serde's `Serialize` and `Deserialize` traits (or uses Serde's derive +//! attribute to automatically generate implementations at compile time). This +//! avoids any overhead of reflection or runtime type information. In fact in +//! many situations the interaction between data structure and data format can +//! be completely optimized away by the Rust compiler, leaving Serde +//! serialization to perform the same speed as a handwritten serializer for the +//! specific selection of data structure and data format. +//! +//! ## Data formats +//! +//! The following is a partial list of data formats that have been implemented +//! for Serde by the community. +//! +//! - [JSON], the ubiquitous JavaScript Object Notation used by many HTTP APIs. +//! - [Bincode], a compact binary format +//! used for IPC within the Servo rendering engine. +//! - [CBOR], a Concise Binary Object Representation designed for small message +//! size without the need for version negotiation. +//! - [YAML], a self-proclaimed human-friendly configuration language that ain't +//! markup language. +//! - [MessagePack], an efficient binary format that resembles a compact JSON. +//! - [TOML], a minimal configuration format used by [Cargo]. +//! - [Pickle], a format common in the Python world. +//! - [RON], a Rusty Object Notation. +//! - [BSON], the data storage and network transfer format used by MongoDB. +//! - [Avro], a binary format used within Apache Hadoop, with support for schema +//! definition. +//! - [JSON5], a superset of JSON including some productions from ES5. +//! - [Postcard], a no\_std and embedded-systems friendly compact binary format. +//! - [URL] query strings, in the x-www-form-urlencoded format. +//! - [Envy], a way to deserialize environment variables into Rust structs. +//! *(deserialization only)* +//! - [Envy Store], a way to deserialize [AWS Parameter Store] parameters into +//! Rust structs. *(deserialization only)* +//! - [S-expressions], the textual representation of code and data used by the +//! Lisp language family. +//! - [D-Bus]'s binary wire format. +//! - [FlexBuffers], the schemaless cousin of Google's FlatBuffers zero-copy serialization format. +//! - [DynamoDB Items], the format used by [rusoto_dynamodb] to transfer data to +//! and from DynamoDB. +//! +//! [JSON]: https://github.com/serde-rs/json +//! [Bincode]: https://github.com/bincode-org/bincode +//! [CBOR]: https://github.com/enarx/ciborium +//! [YAML]: https://github.com/dtolnay/serde-yaml +//! [MessagePack]: https://github.com/3Hren/msgpack-rust +//! [TOML]: https://github.com/alexcrichton/toml-rs +//! [Pickle]: https://github.com/birkenfeld/serde-pickle +//! [RON]: https://github.com/ron-rs/ron +//! [BSON]: https://github.com/mongodb/bson-rust +//! [Avro]: https://github.com/flavray/avro-rs +//! [JSON5]: https://github.com/callum-oakley/json5-rs +//! [Postcard]: https://github.com/jamesmunns/postcard +//! [URL]: https://docs.rs/serde_qs +//! [Envy]: https://github.com/softprops/envy +//! [Envy Store]: https://github.com/softprops/envy-store +//! [Cargo]: https://doc.rust-lang.org/cargo/reference/manifest.html +//! [AWS Parameter Store]: https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-parameter-store.html +//! [S-expressions]: https://github.com/rotty/lexpr-rs +//! [D-Bus]: https://docs.rs/zvariant +//! [FlexBuffers]: https://github.com/google/flatbuffers/tree/master/rust/flexbuffers +//! [DynamoDB Items]: https://docs.rs/serde_dynamo +//! [rusoto_dynamodb]: https://docs.rs/rusoto_dynamodb + +//////////////////////////////////////////////////////////////////////////////// + +// Serde types in rustdoc of other crates get linked to here. +#![doc(html_root_url = "https://docs.rs/serde/1.0.140")] +// Support using Serde without the standard library! +#![cfg_attr(not(feature = "std"), no_std)] +// Unstable functionality only if the user asks for it. For tracking and +// discussion of these features please refer to this issue: +// +// https://github.com/serde-rs/serde/issues/812 +#![cfg_attr(feature = "unstable", feature(never_type))] +#![allow(unknown_lints, bare_trait_objects, deprecated)] +#![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))] +// Ignored clippy and clippy_pedantic lints +#![cfg_attr( + feature = "cargo-clippy", + allow( + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704 + unnested_or_patterns, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/7768 + semicolon_if_nothing_returned, + // not available in our oldest supported compiler + empty_enum, + type_repetition_in_bounds, // https://github.com/rust-lang/rust-clippy/issues/8772 + // integer and float ser/de requires these sorts of casts + cast_possible_truncation, + cast_possible_wrap, + cast_sign_loss, + // things are often more readable this way + cast_lossless, + module_name_repetitions, + option_if_let_else, + single_match_else, + type_complexity, + use_self, + zero_prefixed_literal, + // correctly used + derive_partial_eq_without_eq, + enum_glob_use, + explicit_auto_deref, + let_underscore_drop, + map_err_ignore, + new_without_default, + result_unit_err, + wildcard_imports, + // not practical + needless_pass_by_value, + similar_names, + too_many_lines, + // preference + doc_markdown, + unseparated_literal_suffix, + // false positive + needless_doctest_main, + // noisy + missing_errors_doc, + must_use_candidate, + ) +)] +// Rustc lints. +#![deny(missing_docs, unused_imports)] + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "alloc")] +extern crate alloc; + +/// A facade around all the types we need from the `std`, `core`, and `alloc` +/// crates. This avoids elaborate import wrangling having to happen in every +/// module. +mod lib { + mod core { + #[cfg(not(feature = "std"))] + pub use core::*; + #[cfg(feature = "std")] + pub use std::*; + } + + pub use self::core::{cmp, iter, mem, num, ptr, slice, str}; + pub use self::core::{f32, f64}; + pub use self::core::{i16, i32, i64, i8, isize}; + pub use self::core::{u16, u32, u64, u8, usize}; + + pub use self::core::cell::{Cell, RefCell}; + pub use self::core::clone::{self, Clone}; + pub use self::core::convert::{self, From, Into}; + pub use self::core::default::{self, Default}; + pub use self::core::fmt::{self, Debug, Display}; + pub use self::core::marker::{self, PhantomData}; + pub use self::core::num::Wrapping; + pub use self::core::ops::Range; + pub use self::core::option::{self, Option}; + pub use self::core::result::{self, Result}; + + #[cfg(all(feature = "alloc", not(feature = "std")))] + pub use alloc::borrow::{Cow, ToOwned}; + #[cfg(feature = "std")] + pub use std::borrow::{Cow, ToOwned}; + + #[cfg(all(feature = "alloc", not(feature = "std")))] + pub use alloc::string::{String, ToString}; + #[cfg(feature = "std")] + pub use std::string::{String, ToString}; + + #[cfg(all(feature = "alloc", not(feature = "std")))] + pub use alloc::vec::Vec; + #[cfg(feature = "std")] + pub use std::vec::Vec; + + #[cfg(all(feature = "alloc", not(feature = "std")))] + pub use alloc::boxed::Box; + #[cfg(feature = "std")] + pub use std::boxed::Box; + + #[cfg(all(feature = "rc", feature = "alloc", not(feature = "std")))] + pub use alloc::rc::{Rc, Weak as RcWeak}; + #[cfg(all(feature = "rc", feature = "std"))] + pub use std::rc::{Rc, Weak as RcWeak}; + + #[cfg(all(feature = "rc", feature = "alloc", not(feature = "std")))] + pub use alloc::sync::{Arc, Weak as ArcWeak}; + #[cfg(all(feature = "rc", feature = "std"))] + pub use std::sync::{Arc, Weak as ArcWeak}; + + #[cfg(all(feature = "alloc", not(feature = "std")))] + pub use alloc::collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque}; + #[cfg(feature = "std")] + pub use std::collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque}; + + #[cfg(feature = "std")] + pub use std::{error, net}; + + #[cfg(feature = "std")] + pub use std::collections::{HashMap, HashSet}; + #[cfg(feature = "std")] + pub use std::ffi::{CStr, CString, OsStr, OsString}; + #[cfg(feature = "std")] + pub use std::hash::{BuildHasher, Hash}; + #[cfg(feature = "std")] + pub use std::io::Write; + #[cfg(feature = "std")] + pub use std::path::{Path, PathBuf}; + #[cfg(feature = "std")] + pub use std::sync::{Mutex, RwLock}; + #[cfg(feature = "std")] + pub use std::time::{SystemTime, UNIX_EPOCH}; + + #[cfg(all(feature = "std", not(no_collections_bound), no_ops_bound))] + pub use std::collections::Bound; + + #[cfg(not(no_core_reverse))] + pub use self::core::cmp::Reverse; + + #[cfg(not(no_ops_bound))] + pub use self::core::ops::Bound; + + #[cfg(not(no_range_inclusive))] + pub use self::core::ops::RangeInclusive; + + #[cfg(all(feature = "std", not(no_std_atomic)))] + pub use std::sync::atomic::{ + AtomicBool, AtomicI16, AtomicI32, AtomicI8, AtomicIsize, AtomicU16, AtomicU32, AtomicU8, + AtomicUsize, Ordering, + }; + #[cfg(all(feature = "std", not(no_std_atomic64)))] + pub use std::sync::atomic::{AtomicI64, AtomicU64}; + + #[cfg(any(feature = "std", not(no_core_duration)))] + pub use self::core::time::Duration; +} + +//////////////////////////////////////////////////////////////////////////////// + +#[macro_use] +mod macros; + +#[macro_use] +mod integer128; + +pub mod de; +pub mod ser; + +#[doc(inline)] +pub use de::{Deserialize, Deserializer}; +#[doc(inline)] +pub use ser::{Serialize, Serializer}; + +// Used by generated code and doc tests. Not public API. +#[doc(hidden)] +#[path = "private/mod.rs"] +pub mod __private; + +#[allow(unused_imports)] +use self::__private as export; +#[allow(unused_imports)] +use self::__private as private; + +#[path = "de/seed.rs"] +mod seed; + +#[cfg(not(feature = "std"))] +mod std_error; + +// Re-export #[derive(Serialize, Deserialize)]. +// +// The reason re-exporting is not enabled by default is that disabling it would +// be annoying for crates that provide handwritten impls or data formats. They +// would need to disable default features and then explicitly re-enable std. +#[cfg(feature = "serde_derive")] +#[allow(unused_imports)] +#[macro_use] +extern crate serde_derive; +#[cfg(feature = "serde_derive")] +#[doc(hidden)] +pub use serde_derive::*; + +#[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))] +mod actually_private { + pub struct T; +} diff --git a/vendor/serde/src/macros.rs b/vendor/serde/src/macros.rs new file mode 100644 index 000000000..6502a23a7 --- /dev/null +++ b/vendor/serde/src/macros.rs @@ -0,0 +1,236 @@ +// Super explicit first paragraph because this shows up at the top level and +// trips up people who are just looking for basic Serialize / Deserialize +// documentation. +// +/// Helper macro when implementing the `Deserializer` part of a new data format +/// for Serde. +/// +/// Some [`Deserializer`] implementations for self-describing formats do not +/// care what hint the [`Visitor`] gives them, they just want to blindly call +/// the [`Visitor`] method corresponding to the data they can tell is in the +/// input. This requires repetitive implementations of all the [`Deserializer`] +/// trait methods. +/// +/// ```edition2018 +/// # use serde::forward_to_deserialize_any; +/// # use serde::de::{value, Deserializer, Visitor}; +/// # +/// # struct MyDeserializer; +/// # +/// # impl<'de> Deserializer<'de> for MyDeserializer { +/// # type Error = value::Error; +/// # +/// # fn deserialize_any<V>(self, _: V) -> Result<V::Value, Self::Error> +/// # where +/// # V: Visitor<'de>, +/// # { +/// # unimplemented!() +/// # } +/// # +/// #[inline] +/// fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error> +/// where +/// V: Visitor<'de>, +/// { +/// self.deserialize_any(visitor) +/// } +/// # +/// # forward_to_deserialize_any! { +/// # i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string +/// # bytes byte_buf option unit unit_struct newtype_struct seq tuple +/// # tuple_struct map struct enum identifier ignored_any +/// # } +/// # } +/// ``` +/// +/// The `forward_to_deserialize_any!` macro implements these simple forwarding +/// methods so that they forward directly to [`Deserializer::deserialize_any`]. +/// You can choose which methods to forward. +/// +/// ```edition2018 +/// # use serde::forward_to_deserialize_any; +/// # use serde::de::{value, Deserializer, Visitor}; +/// # +/// # struct MyDeserializer; +/// # +/// impl<'de> Deserializer<'de> for MyDeserializer { +/// # type Error = value::Error; +/// # +/// fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> +/// where +/// V: Visitor<'de>, +/// { +/// /* ... */ +/// # let _ = visitor; +/// # unimplemented!() +/// } +/// +/// forward_to_deserialize_any! { +/// bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string +/// bytes byte_buf option unit unit_struct newtype_struct seq tuple +/// tuple_struct map struct enum identifier ignored_any +/// } +/// } +/// ``` +/// +/// The macro assumes the convention that your `Deserializer` lifetime parameter +/// is called `'de` and that the `Visitor` type parameters on each method are +/// called `V`. A different type parameter and a different lifetime can be +/// specified explicitly if necessary. +/// +/// ```edition2018 +/// # use std::marker::PhantomData; +/// # +/// # use serde::forward_to_deserialize_any; +/// # use serde::de::{value, Deserializer, Visitor}; +/// # +/// # struct MyDeserializer<V>(PhantomData<V>); +/// # +/// # impl<'q, V> Deserializer<'q> for MyDeserializer<V> { +/// # type Error = value::Error; +/// # +/// # fn deserialize_any<W>(self, visitor: W) -> Result<W::Value, Self::Error> +/// # where +/// # W: Visitor<'q>, +/// # { +/// # unimplemented!() +/// # } +/// # +/// forward_to_deserialize_any! { +/// <W: Visitor<'q>> +/// bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string +/// bytes byte_buf option unit unit_struct newtype_struct seq tuple +/// tuple_struct map struct enum identifier ignored_any +/// } +/// # } +/// ``` +/// +/// [`Deserializer`]: trait.Deserializer.html +/// [`Visitor`]: de/trait.Visitor.html +/// [`Deserializer::deserialize_any`]: trait.Deserializer.html#tymethod.deserialize_any +#[macro_export(local_inner_macros)] +macro_rules! forward_to_deserialize_any { + (<$visitor:ident: Visitor<$lifetime:tt>> $($func:ident)*) => { + $(forward_to_deserialize_any_helper!{$func<$lifetime, $visitor>})* + }; + // This case must be after the previous one. + ($($func:ident)*) => { + $(forward_to_deserialize_any_helper!{$func<'de, V>})* + }; +} + +#[doc(hidden)] +#[macro_export] +macro_rules! forward_to_deserialize_any_method { + ($func:ident<$l:tt, $v:ident>($($arg:ident : $ty:ty),*)) => { + #[inline] + fn $func<$v>(self, $($arg: $ty,)* visitor: $v) -> $crate::__private::Result<$v::Value, Self::Error> + where + $v: $crate::de::Visitor<$l>, + { + $( + let _ = $arg; + )* + self.deserialize_any(visitor) + } + }; +} + +#[doc(hidden)] +#[macro_export(local_inner_macros)] +macro_rules! forward_to_deserialize_any_helper { + (bool<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_bool<$l, $v>()} + }; + (i8<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_i8<$l, $v>()} + }; + (i16<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_i16<$l, $v>()} + }; + (i32<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_i32<$l, $v>()} + }; + (i64<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_i64<$l, $v>()} + }; + (i128<$l:tt, $v:ident>) => { + serde_if_integer128! { + forward_to_deserialize_any_method!{deserialize_i128<$l, $v>()} + } + }; + (u8<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_u8<$l, $v>()} + }; + (u16<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_u16<$l, $v>()} + }; + (u32<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_u32<$l, $v>()} + }; + (u64<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_u64<$l, $v>()} + }; + (u128<$l:tt, $v:ident>) => { + serde_if_integer128! { + forward_to_deserialize_any_method!{deserialize_u128<$l, $v>()} + } + }; + (f32<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_f32<$l, $v>()} + }; + (f64<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_f64<$l, $v>()} + }; + (char<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_char<$l, $v>()} + }; + (str<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_str<$l, $v>()} + }; + (string<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_string<$l, $v>()} + }; + (bytes<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_bytes<$l, $v>()} + }; + (byte_buf<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_byte_buf<$l, $v>()} + }; + (option<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_option<$l, $v>()} + }; + (unit<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_unit<$l, $v>()} + }; + (unit_struct<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_unit_struct<$l, $v>(name: &'static str)} + }; + (newtype_struct<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_newtype_struct<$l, $v>(name: &'static str)} + }; + (seq<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_seq<$l, $v>()} + }; + (tuple<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_tuple<$l, $v>(len: usize)} + }; + (tuple_struct<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_tuple_struct<$l, $v>(name: &'static str, len: usize)} + }; + (map<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_map<$l, $v>()} + }; + (struct<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_struct<$l, $v>(name: &'static str, fields: &'static [&'static str])} + }; + (enum<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_enum<$l, $v>(name: &'static str, variants: &'static [&'static str])} + }; + (identifier<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_identifier<$l, $v>()} + }; + (ignored_any<$l:tt, $v:ident>) => { + forward_to_deserialize_any_method!{deserialize_ignored_any<$l, $v>()} + }; +} diff --git a/vendor/serde/src/private/de.rs b/vendor/serde/src/private/de.rs new file mode 100644 index 000000000..f0697d64f --- /dev/null +++ b/vendor/serde/src/private/de.rs @@ -0,0 +1,2984 @@ +use lib::*; + +use de::value::{BorrowedBytesDeserializer, BytesDeserializer}; +use de::{Deserialize, Deserializer, Error, IntoDeserializer, Visitor}; + +#[cfg(any(feature = "std", feature = "alloc"))] +use de::{DeserializeSeed, MapAccess, Unexpected}; + +#[cfg(any(feature = "std", feature = "alloc"))] +pub use self::content::{ + Content, ContentDeserializer, ContentRefDeserializer, EnumDeserializer, + InternallyTaggedUnitVisitor, TagContentOtherField, TagContentOtherFieldVisitor, + TagOrContentField, TagOrContentFieldVisitor, TaggedContentVisitor, UntaggedUnitVisitor, +}; + +pub use seed::InPlaceSeed; + +/// If the missing field is of type `Option<T>` then treat is as `None`, +/// otherwise it is an error. +pub fn missing_field<'de, V, E>(field: &'static str) -> Result<V, E> +where + V: Deserialize<'de>, + E: Error, +{ + struct MissingFieldDeserializer<E>(&'static str, PhantomData<E>); + + impl<'de, E> Deserializer<'de> for MissingFieldDeserializer<E> + where + E: Error, + { + type Error = E; + + fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + Err(Error::missing_field(self.0)) + } + + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + visitor.visit_none() + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } + } + + let deserializer = MissingFieldDeserializer(field, PhantomData); + Deserialize::deserialize(deserializer) +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub fn borrow_cow_str<'de: 'a, 'a, D, R>(deserializer: D) -> Result<R, D::Error> +where + D: Deserializer<'de>, + R: From<Cow<'a, str>>, +{ + struct CowStrVisitor; + + impl<'a> Visitor<'a> for CowStrVisitor { + type Value = Cow<'a, str>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a string") + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Owned(v.to_owned())) + } + + fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Borrowed(v)) + } + + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Owned(v)) + } + + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + match str::from_utf8(v) { + Ok(s) => Ok(Cow::Owned(s.to_owned())), + Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)), + } + } + + fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> + where + E: Error, + { + match str::from_utf8(v) { + Ok(s) => Ok(Cow::Borrowed(s)), + Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)), + } + } + + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + match String::from_utf8(v) { + Ok(s) => Ok(Cow::Owned(s)), + Err(e) => Err(Error::invalid_value( + Unexpected::Bytes(&e.into_bytes()), + &self, + )), + } + } + } + + deserializer.deserialize_str(CowStrVisitor).map(From::from) +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub fn borrow_cow_bytes<'de: 'a, 'a, D, R>(deserializer: D) -> Result<R, D::Error> +where + D: Deserializer<'de>, + R: From<Cow<'a, [u8]>>, +{ + struct CowBytesVisitor; + + impl<'a> Visitor<'a> for CowBytesVisitor { + type Value = Cow<'a, [u8]>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a byte array") + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Owned(v.as_bytes().to_vec())) + } + + fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Borrowed(v.as_bytes())) + } + + fn visit_string<E>(self, v: String) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Owned(v.into_bytes())) + } + + fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Owned(v.to_vec())) + } + + fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Borrowed(v)) + } + + fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> + where + E: Error, + { + Ok(Cow::Owned(v)) + } + } + + deserializer + .deserialize_bytes(CowBytesVisitor) + .map(From::from) +} + +#[cfg(any(feature = "std", feature = "alloc"))] +mod content { + // This module is private and nothing here should be used outside of + // generated code. + // + // We will iterate on the implementation for a few releases and only have to + // worry about backward compatibility for the `untagged` and `tag` attributes + // rather than for this entire mechanism. + // + // This issue is tracking making some of this stuff public: + // https://github.com/serde-rs/serde/issues/741 + + use lib::*; + + use __private::size_hint; + use actually_private; + use de::{ + self, Deserialize, DeserializeSeed, Deserializer, EnumAccess, Expected, IgnoredAny, + MapAccess, SeqAccess, Unexpected, Visitor, + }; + + /// Used from generated code to buffer the contents of the Deserializer when + /// deserializing untagged enums and internally tagged enums. + /// + /// Not public API. Use serde-value instead. + #[derive(Debug, Clone)] + pub enum Content<'de> { + Bool(bool), + + U8(u8), + U16(u16), + U32(u32), + U64(u64), + + I8(i8), + I16(i16), + I32(i32), + I64(i64), + + F32(f32), + F64(f64), + + Char(char), + String(String), + Str(&'de str), + ByteBuf(Vec<u8>), + Bytes(&'de [u8]), + + None, + Some(Box<Content<'de>>), + + Unit, + Newtype(Box<Content<'de>>), + Seq(Vec<Content<'de>>), + Map(Vec<(Content<'de>, Content<'de>)>), + } + + impl<'de> Content<'de> { + pub fn as_str(&self) -> Option<&str> { + match *self { + Content::Str(x) => Some(x), + Content::String(ref x) => Some(x), + Content::Bytes(x) => str::from_utf8(x).ok(), + Content::ByteBuf(ref x) => str::from_utf8(x).ok(), + _ => None, + } + } + + #[cold] + fn unexpected(&self) -> Unexpected { + match *self { + Content::Bool(b) => Unexpected::Bool(b), + Content::U8(n) => Unexpected::Unsigned(n as u64), + Content::U16(n) => Unexpected::Unsigned(n as u64), + Content::U32(n) => Unexpected::Unsigned(n as u64), + Content::U64(n) => Unexpected::Unsigned(n), + Content::I8(n) => Unexpected::Signed(n as i64), + Content::I16(n) => Unexpected::Signed(n as i64), + Content::I32(n) => Unexpected::Signed(n as i64), + Content::I64(n) => Unexpected::Signed(n), + Content::F32(f) => Unexpected::Float(f as f64), + Content::F64(f) => Unexpected::Float(f), + Content::Char(c) => Unexpected::Char(c), + Content::String(ref s) => Unexpected::Str(s), + Content::Str(s) => Unexpected::Str(s), + Content::ByteBuf(ref b) => Unexpected::Bytes(b), + Content::Bytes(b) => Unexpected::Bytes(b), + Content::None | Content::Some(_) => Unexpected::Option, + Content::Unit => Unexpected::Unit, + Content::Newtype(_) => Unexpected::NewtypeStruct, + Content::Seq(_) => Unexpected::Seq, + Content::Map(_) => Unexpected::Map, + } + } + } + + impl<'de> Deserialize<'de> for Content<'de> { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + // Untagged and internally tagged enums are only supported in + // self-describing formats. + let visitor = ContentVisitor { value: PhantomData }; + deserializer.__deserialize_content(actually_private::T, visitor) + } + } + + struct ContentVisitor<'de> { + value: PhantomData<Content<'de>>, + } + + impl<'de> ContentVisitor<'de> { + fn new() -> Self { + ContentVisitor { value: PhantomData } + } + } + + impl<'de> Visitor<'de> for ContentVisitor<'de> { + type Value = Content<'de>; + + fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.write_str("any value") + } + + fn visit_bool<F>(self, value: bool) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::Bool(value)) + } + + fn visit_i8<F>(self, value: i8) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::I8(value)) + } + + fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::I16(value)) + } + + fn visit_i32<F>(self, value: i32) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::I32(value)) + } + + fn visit_i64<F>(self, value: i64) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::I64(value)) + } + + fn visit_u8<F>(self, value: u8) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::U8(value)) + } + + fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::U16(value)) + } + + fn visit_u32<F>(self, value: u32) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::U32(value)) + } + + fn visit_u64<F>(self, value: u64) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::U64(value)) + } + + fn visit_f32<F>(self, value: f32) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::F32(value)) + } + + fn visit_f64<F>(self, value: f64) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::F64(value)) + } + + fn visit_char<F>(self, value: char) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::Char(value)) + } + + fn visit_str<F>(self, value: &str) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::String(value.into())) + } + + fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::Str(value)) + } + + fn visit_string<F>(self, value: String) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::String(value)) + } + + fn visit_bytes<F>(self, value: &[u8]) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::ByteBuf(value.into())) + } + + fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::Bytes(value)) + } + + fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::ByteBuf(value)) + } + + fn visit_unit<F>(self) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::Unit) + } + + fn visit_none<F>(self) -> Result<Self::Value, F> + where + F: de::Error, + { + Ok(Content::None) + } + + fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + Deserialize::deserialize(deserializer).map(|v| Content::Some(Box::new(v))) + } + + fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + Deserialize::deserialize(deserializer).map(|v| Content::Newtype(Box::new(v))) + } + + fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> + where + V: SeqAccess<'de>, + { + let mut vec = Vec::with_capacity(size_hint::cautious(visitor.size_hint())); + while let Some(e) = try!(visitor.next_element()) { + vec.push(e); + } + Ok(Content::Seq(vec)) + } + + fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> + where + V: MapAccess<'de>, + { + let mut vec = Vec::with_capacity(size_hint::cautious(visitor.size_hint())); + while let Some(kv) = try!(visitor.next_entry()) { + vec.push(kv); + } + Ok(Content::Map(vec)) + } + + fn visit_enum<V>(self, _visitor: V) -> Result<Self::Value, V::Error> + where + V: EnumAccess<'de>, + { + Err(de::Error::custom( + "untagged and internally tagged enums do not support enum input", + )) + } + } + + /// This is the type of the map keys in an internally tagged enum. + /// + /// Not public API. + pub enum TagOrContent<'de> { + Tag, + Content(Content<'de>), + } + + struct TagOrContentVisitor<'de> { + name: &'static str, + value: PhantomData<TagOrContent<'de>>, + } + + impl<'de> TagOrContentVisitor<'de> { + fn new(name: &'static str) -> Self { + TagOrContentVisitor { + name: name, + value: PhantomData, + } + } + } + + impl<'de> DeserializeSeed<'de> for TagOrContentVisitor<'de> { + type Value = TagOrContent<'de>; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + // Internally tagged enums are only supported in self-describing + // formats. + deserializer.deserialize_any(self) + } + } + + impl<'de> Visitor<'de> for TagOrContentVisitor<'de> { + type Value = TagOrContent<'de>; + + fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + write!(fmt, "a type tag `{}` or any other value", self.name) + } + + fn visit_bool<F>(self, value: bool) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_bool(value) + .map(TagOrContent::Content) + } + + fn visit_i8<F>(self, value: i8) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_i8(value) + .map(TagOrContent::Content) + } + + fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_i16(value) + .map(TagOrContent::Content) + } + + fn visit_i32<F>(self, value: i32) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_i32(value) + .map(TagOrContent::Content) + } + + fn visit_i64<F>(self, value: i64) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_i64(value) + .map(TagOrContent::Content) + } + + fn visit_u8<F>(self, value: u8) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_u8(value) + .map(TagOrContent::Content) + } + + fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_u16(value) + .map(TagOrContent::Content) + } + + fn visit_u32<F>(self, value: u32) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_u32(value) + .map(TagOrContent::Content) + } + + fn visit_u64<F>(self, value: u64) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_u64(value) + .map(TagOrContent::Content) + } + + fn visit_f32<F>(self, value: f32) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_f32(value) + .map(TagOrContent::Content) + } + + fn visit_f64<F>(self, value: f64) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_f64(value) + .map(TagOrContent::Content) + } + + fn visit_char<F>(self, value: char) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_char(value) + .map(TagOrContent::Content) + } + + fn visit_str<F>(self, value: &str) -> Result<Self::Value, F> + where + F: de::Error, + { + if value == self.name { + Ok(TagOrContent::Tag) + } else { + ContentVisitor::new() + .visit_str(value) + .map(TagOrContent::Content) + } + } + + fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F> + where + F: de::Error, + { + if value == self.name { + Ok(TagOrContent::Tag) + } else { + ContentVisitor::new() + .visit_borrowed_str(value) + .map(TagOrContent::Content) + } + } + + fn visit_string<F>(self, value: String) -> Result<Self::Value, F> + where + F: de::Error, + { + if value == self.name { + Ok(TagOrContent::Tag) + } else { + ContentVisitor::new() + .visit_string(value) + .map(TagOrContent::Content) + } + } + + fn visit_bytes<F>(self, value: &[u8]) -> Result<Self::Value, F> + where + F: de::Error, + { + if value == self.name.as_bytes() { + Ok(TagOrContent::Tag) + } else { + ContentVisitor::new() + .visit_bytes(value) + .map(TagOrContent::Content) + } + } + + fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F> + where + F: de::Error, + { + if value == self.name.as_bytes() { + Ok(TagOrContent::Tag) + } else { + ContentVisitor::new() + .visit_borrowed_bytes(value) + .map(TagOrContent::Content) + } + } + + fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F> + where + F: de::Error, + { + if value == self.name.as_bytes() { + Ok(TagOrContent::Tag) + } else { + ContentVisitor::new() + .visit_byte_buf(value) + .map(TagOrContent::Content) + } + } + + fn visit_unit<F>(self) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_unit() + .map(TagOrContent::Content) + } + + fn visit_none<F>(self) -> Result<Self::Value, F> + where + F: de::Error, + { + ContentVisitor::new() + .visit_none() + .map(TagOrContent::Content) + } + + fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + ContentVisitor::new() + .visit_some(deserializer) + .map(TagOrContent::Content) + } + + fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + ContentVisitor::new() + .visit_newtype_struct(deserializer) + .map(TagOrContent::Content) + } + + fn visit_seq<V>(self, visitor: V) -> Result<Self::Value, V::Error> + where + V: SeqAccess<'de>, + { + ContentVisitor::new() + .visit_seq(visitor) + .map(TagOrContent::Content) + } + + fn visit_map<V>(self, visitor: V) -> Result<Self::Value, V::Error> + where + V: MapAccess<'de>, + { + ContentVisitor::new() + .visit_map(visitor) + .map(TagOrContent::Content) + } + + fn visit_enum<V>(self, visitor: V) -> Result<Self::Value, V::Error> + where + V: EnumAccess<'de>, + { + ContentVisitor::new() + .visit_enum(visitor) + .map(TagOrContent::Content) + } + } + + /// Used by generated code to deserialize an internally tagged enum. + /// + /// Not public API. + pub struct TaggedContent<'de, T> { + pub tag: T, + pub content: Content<'de>, + } + + /// Not public API. + pub struct TaggedContentVisitor<'de, T> { + tag_name: &'static str, + expecting: &'static str, + value: PhantomData<TaggedContent<'de, T>>, + } + + impl<'de, T> TaggedContentVisitor<'de, T> { + /// Visitor for the content of an internally tagged enum with the given + /// tag name. + pub fn new(name: &'static str, expecting: &'static str) -> Self { + TaggedContentVisitor { + tag_name: name, + expecting: expecting, + value: PhantomData, + } + } + } + + impl<'de, T> DeserializeSeed<'de> for TaggedContentVisitor<'de, T> + where + T: Deserialize<'de>, + { + type Value = TaggedContent<'de, T>; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + // Internally tagged enums are only supported in self-describing + // formats. + deserializer.deserialize_any(self) + } + } + + impl<'de, T> Visitor<'de> for TaggedContentVisitor<'de, T> + where + T: Deserialize<'de>, + { + type Value = TaggedContent<'de, T>; + + fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result { + fmt.write_str(self.expecting) + } + + fn visit_seq<S>(self, mut seq: S) -> Result<Self::Value, S::Error> + where + S: SeqAccess<'de>, + { + let tag = match try!(seq.next_element()) { + Some(tag) => tag, + None => { + return Err(de::Error::missing_field(self.tag_name)); + } + }; + let rest = de::value::SeqAccessDeserializer::new(seq); + Ok(TaggedContent { + tag: tag, + content: try!(Content::deserialize(rest)), + }) + } + + fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error> + where + M: MapAccess<'de>, + { + let mut tag = None; + let mut vec = Vec::with_capacity(size_hint::cautious(map.size_hint())); + while let Some(k) = try!(map.next_key_seed(TagOrContentVisitor::new(self.tag_name))) { + match k { + TagOrContent::Tag => { + if tag.is_some() { + return Err(de::Error::duplicate_field(self.tag_name)); + } + tag = Some(try!(map.next_value())); + } + TagOrContent::Content(k) => { + let v = try!(map.next_value()); + vec.push((k, v)); + } + } + } + match tag { + None => Err(de::Error::missing_field(self.tag_name)), + Some(tag) => Ok(TaggedContent { + tag: tag, + content: Content::Map(vec), + }), + } + } + } + + /// Used by generated code to deserialize an adjacently tagged enum. + /// + /// Not public API. + pub enum TagOrContentField { + Tag, + Content, + } + + /// Not public API. + pub struct TagOrContentFieldVisitor { + pub tag: &'static str, + pub content: &'static str, + } + + impl<'de> DeserializeSeed<'de> for TagOrContentFieldVisitor { + type Value = TagOrContentField; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_str(self) + } + } + + impl<'de> Visitor<'de> for TagOrContentFieldVisitor { + type Value = TagOrContentField; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!(formatter, "{:?} or {:?}", self.tag, self.content) + } + + fn visit_str<E>(self, field: &str) -> Result<Self::Value, E> + where + E: de::Error, + { + if field == self.tag { + Ok(TagOrContentField::Tag) + } else if field == self.content { + Ok(TagOrContentField::Content) + } else { + Err(de::Error::invalid_value(Unexpected::Str(field), &self)) + } + } + } + + /// Used by generated code to deserialize an adjacently tagged enum when + /// ignoring unrelated fields is allowed. + /// + /// Not public API. + pub enum TagContentOtherField { + Tag, + Content, + Other, + } + + /// Not public API. + pub struct TagContentOtherFieldVisitor { + pub tag: &'static str, + pub content: &'static str, + } + + impl<'de> DeserializeSeed<'de> for TagContentOtherFieldVisitor { + type Value = TagContentOtherField; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_str(self) + } + } + + impl<'de> Visitor<'de> for TagContentOtherFieldVisitor { + type Value = TagContentOtherField; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!( + formatter, + "{:?}, {:?}, or other ignored fields", + self.tag, self.content + ) + } + + fn visit_str<E>(self, field: &str) -> Result<Self::Value, E> + where + E: de::Error, + { + if field == self.tag { + Ok(TagContentOtherField::Tag) + } else if field == self.content { + Ok(TagContentOtherField::Content) + } else { + Ok(TagContentOtherField::Other) + } + } + } + + /// Not public API + pub struct ContentDeserializer<'de, E> { + content: Content<'de>, + err: PhantomData<E>, + } + + impl<'de, E> ContentDeserializer<'de, E> + where + E: de::Error, + { + #[cold] + fn invalid_type(self, exp: &Expected) -> E { + de::Error::invalid_type(self.content.unexpected(), exp) + } + + fn deserialize_integer<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match self.content { + Content::U8(v) => visitor.visit_u8(v), + Content::U16(v) => visitor.visit_u16(v), + Content::U32(v) => visitor.visit_u32(v), + Content::U64(v) => visitor.visit_u64(v), + Content::I8(v) => visitor.visit_i8(v), + Content::I16(v) => visitor.visit_i16(v), + Content::I32(v) => visitor.visit_i32(v), + Content::I64(v) => visitor.visit_i64(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_float<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match self.content { + Content::F32(v) => visitor.visit_f32(v), + Content::F64(v) => visitor.visit_f64(v), + Content::U8(v) => visitor.visit_u8(v), + Content::U16(v) => visitor.visit_u16(v), + Content::U32(v) => visitor.visit_u32(v), + Content::U64(v) => visitor.visit_u64(v), + Content::I8(v) => visitor.visit_i8(v), + Content::I16(v) => visitor.visit_i16(v), + Content::I32(v) => visitor.visit_i32(v), + Content::I64(v) => visitor.visit_i64(v), + _ => Err(self.invalid_type(&visitor)), + } + } + } + + fn visit_content_seq<'de, V, E>(content: Vec<Content<'de>>, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + E: de::Error, + { + let seq = content.into_iter().map(ContentDeserializer::new); + let mut seq_visitor = de::value::SeqDeserializer::new(seq); + let value = try!(visitor.visit_seq(&mut seq_visitor)); + try!(seq_visitor.end()); + Ok(value) + } + + fn visit_content_map<'de, V, E>( + content: Vec<(Content<'de>, Content<'de>)>, + visitor: V, + ) -> Result<V::Value, E> + where + V: Visitor<'de>, + E: de::Error, + { + let map = content + .into_iter() + .map(|(k, v)| (ContentDeserializer::new(k), ContentDeserializer::new(v))); + let mut map_visitor = de::value::MapDeserializer::new(map); + let value = try!(visitor.visit_map(&mut map_visitor)); + try!(map_visitor.end()); + Ok(value) + } + + /// Used when deserializing an internally tagged enum because the content + /// will be used exactly once. + impl<'de, E> Deserializer<'de> for ContentDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Bool(v) => visitor.visit_bool(v), + Content::U8(v) => visitor.visit_u8(v), + Content::U16(v) => visitor.visit_u16(v), + Content::U32(v) => visitor.visit_u32(v), + Content::U64(v) => visitor.visit_u64(v), + Content::I8(v) => visitor.visit_i8(v), + Content::I16(v) => visitor.visit_i16(v), + Content::I32(v) => visitor.visit_i32(v), + Content::I64(v) => visitor.visit_i64(v), + Content::F32(v) => visitor.visit_f32(v), + Content::F64(v) => visitor.visit_f64(v), + Content::Char(v) => visitor.visit_char(v), + Content::String(v) => visitor.visit_string(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(v) => visitor.visit_byte_buf(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + Content::Unit => visitor.visit_unit(), + Content::None => visitor.visit_none(), + Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)), + Content::Newtype(v) => visitor.visit_newtype_struct(ContentDeserializer::new(*v)), + Content::Seq(v) => visit_content_seq(v, visitor), + Content::Map(v) => visit_content_map(v, visitor), + } + } + + fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Bool(v) => visitor.visit_bool(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_float(visitor) + } + + fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_float(visitor) + } + + fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Char(v) => visitor.visit_char(v), + Content::String(v) => visitor.visit_string(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_string(visitor) + } + + fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::String(v) => visitor.visit_string(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(v) => visitor.visit_byte_buf(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_byte_buf(visitor) + } + + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::String(v) => visitor.visit_string(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(v) => visitor.visit_byte_buf(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + Content::Seq(v) => visit_content_seq(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::None => visitor.visit_none(), + Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)), + Content::Unit => visitor.visit_unit(), + _ => visitor.visit_some(self), + } + } + + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Unit => visitor.visit_unit(), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_unit_struct<V>( + self, + _name: &'static str, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + // As a special case, allow deserializing untagged newtype + // variant containing unit struct. + // + // #[derive(Deserialize)] + // struct Info; + // + // #[derive(Deserialize)] + // #[serde(tag = "topic")] + // enum Message { + // Info(Info), + // } + // + // We want {"topic":"Info"} to deserialize even though + // ordinarily unit structs do not deserialize from empty map/seq. + Content::Map(ref v) if v.is_empty() => visitor.visit_unit(), + Content::Seq(ref v) if v.is_empty() => visitor.visit_unit(), + _ => self.deserialize_any(visitor), + } + } + + fn deserialize_newtype_struct<V>( + self, + _name: &str, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Newtype(v) => visitor.visit_newtype_struct(ContentDeserializer::new(*v)), + _ => visitor.visit_newtype_struct(self), + } + } + + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Seq(v) => visit_content_seq(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_tuple_struct<V>( + self, + _name: &'static str, + _len: usize, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Map(v) => visit_content_map(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_struct<V>( + self, + _name: &'static str, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::Seq(v) => visit_content_seq(v, visitor), + Content::Map(v) => visit_content_map(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + let (variant, value) = match self.content { + Content::Map(value) => { + let mut iter = value.into_iter(); + let (variant, value) = match iter.next() { + Some(v) => v, + None => { + return Err(de::Error::invalid_value( + de::Unexpected::Map, + &"map with a single key", + )); + } + }; + // enums are encoded in json as maps with a single key:value pair + if iter.next().is_some() { + return Err(de::Error::invalid_value( + de::Unexpected::Map, + &"map with a single key", + )); + } + (variant, Some(value)) + } + s @ Content::String(_) | s @ Content::Str(_) => (s, None), + other => { + return Err(de::Error::invalid_type( + other.unexpected(), + &"string or map", + )); + } + }; + + visitor.visit_enum(EnumDeserializer::new(variant, value)) + } + + fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match self.content { + Content::String(v) => visitor.visit_string(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(v) => visitor.visit_byte_buf(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + Content::U8(v) => visitor.visit_u8(v), + Content::U64(v) => visitor.visit_u64(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + drop(self); + visitor.visit_unit() + } + + fn __deserialize_content<V>( + self, + _: actually_private::T, + visitor: V, + ) -> Result<Content<'de>, Self::Error> + where + V: Visitor<'de, Value = Content<'de>>, + { + let _ = visitor; + Ok(self.content) + } + } + + impl<'de, E> ContentDeserializer<'de, E> { + /// private API, don't use + pub fn new(content: Content<'de>) -> Self { + ContentDeserializer { + content: content, + err: PhantomData, + } + } + } + + pub struct EnumDeserializer<'de, E> + where + E: de::Error, + { + variant: Content<'de>, + value: Option<Content<'de>>, + err: PhantomData<E>, + } + + impl<'de, E> EnumDeserializer<'de, E> + where + E: de::Error, + { + pub fn new(variant: Content<'de>, value: Option<Content<'de>>) -> EnumDeserializer<'de, E> { + EnumDeserializer { + variant: variant, + value: value, + err: PhantomData, + } + } + } + + impl<'de, E> de::EnumAccess<'de> for EnumDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + type Variant = VariantDeserializer<'de, Self::Error>; + + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), E> + where + V: de::DeserializeSeed<'de>, + { + let visitor = VariantDeserializer { + value: self.value, + err: PhantomData, + }; + seed.deserialize(ContentDeserializer::new(self.variant)) + .map(|v| (v, visitor)) + } + } + + pub struct VariantDeserializer<'de, E> + where + E: de::Error, + { + value: Option<Content<'de>>, + err: PhantomData<E>, + } + + impl<'de, E> de::VariantAccess<'de> for VariantDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + + fn unit_variant(self) -> Result<(), E> { + match self.value { + Some(value) => de::Deserialize::deserialize(ContentDeserializer::new(value)), + None => Ok(()), + } + } + + fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, E> + where + T: de::DeserializeSeed<'de>, + { + match self.value { + Some(value) => seed.deserialize(ContentDeserializer::new(value)), + None => Err(de::Error::invalid_type( + de::Unexpected::UnitVariant, + &"newtype variant", + )), + } + } + + fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + match self.value { + Some(Content::Seq(v)) => { + de::Deserializer::deserialize_any(SeqDeserializer::new(v), visitor) + } + Some(other) => Err(de::Error::invalid_type( + other.unexpected(), + &"tuple variant", + )), + None => Err(de::Error::invalid_type( + de::Unexpected::UnitVariant, + &"tuple variant", + )), + } + } + + fn struct_variant<V>( + self, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + match self.value { + Some(Content::Map(v)) => { + de::Deserializer::deserialize_any(MapDeserializer::new(v), visitor) + } + Some(Content::Seq(v)) => { + de::Deserializer::deserialize_any(SeqDeserializer::new(v), visitor) + } + Some(other) => Err(de::Error::invalid_type( + other.unexpected(), + &"struct variant", + )), + None => Err(de::Error::invalid_type( + de::Unexpected::UnitVariant, + &"struct variant", + )), + } + } + } + + struct SeqDeserializer<'de, E> + where + E: de::Error, + { + iter: <Vec<Content<'de>> as IntoIterator>::IntoIter, + err: PhantomData<E>, + } + + impl<'de, E> SeqDeserializer<'de, E> + where + E: de::Error, + { + fn new(vec: Vec<Content<'de>>) -> Self { + SeqDeserializer { + iter: vec.into_iter(), + err: PhantomData, + } + } + } + + impl<'de, E> de::Deserializer<'de> for SeqDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + + #[inline] + fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let len = self.iter.len(); + if len == 0 { + visitor.visit_unit() + } else { + let ret = try!(visitor.visit_seq(&mut self)); + let remaining = self.iter.len(); + if remaining == 0 { + Ok(ret) + } else { + Err(de::Error::invalid_length(len, &"fewer elements in array")) + } + } + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } + } + + impl<'de, E> de::SeqAccess<'de> for SeqDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.iter.next() { + Some(value) => seed.deserialize(ContentDeserializer::new(value)).map(Some), + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } + } + + struct MapDeserializer<'de, E> + where + E: de::Error, + { + iter: <Vec<(Content<'de>, Content<'de>)> as IntoIterator>::IntoIter, + value: Option<Content<'de>>, + err: PhantomData<E>, + } + + impl<'de, E> MapDeserializer<'de, E> + where + E: de::Error, + { + fn new(map: Vec<(Content<'de>, Content<'de>)>) -> Self { + MapDeserializer { + iter: map.into_iter(), + value: None, + err: PhantomData, + } + } + } + + impl<'de, E> de::MapAccess<'de> for MapDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.iter.next() { + Some((key, value)) => { + self.value = Some(value); + seed.deserialize(ContentDeserializer::new(key)).map(Some) + } + None => Ok(None), + } + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.value.take() { + Some(value) => seed.deserialize(ContentDeserializer::new(value)), + None => Err(de::Error::custom("value is missing")), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } + } + + impl<'de, E> de::Deserializer<'de> for MapDeserializer<'de, E> + where + E: de::Error, + { + type Error = E; + + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_map(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } + } + + /// Not public API. + pub struct ContentRefDeserializer<'a, 'de: 'a, E> { + content: &'a Content<'de>, + err: PhantomData<E>, + } + + impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + #[cold] + fn invalid_type(self, exp: &Expected) -> E { + de::Error::invalid_type(self.content.unexpected(), exp) + } + + fn deserialize_integer<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match *self.content { + Content::U8(v) => visitor.visit_u8(v), + Content::U16(v) => visitor.visit_u16(v), + Content::U32(v) => visitor.visit_u32(v), + Content::U64(v) => visitor.visit_u64(v), + Content::I8(v) => visitor.visit_i8(v), + Content::I16(v) => visitor.visit_i16(v), + Content::I32(v) => visitor.visit_i32(v), + Content::I64(v) => visitor.visit_i64(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_float<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match *self.content { + Content::F32(v) => visitor.visit_f32(v), + Content::F64(v) => visitor.visit_f64(v), + Content::U8(v) => visitor.visit_u8(v), + Content::U16(v) => visitor.visit_u16(v), + Content::U32(v) => visitor.visit_u32(v), + Content::U64(v) => visitor.visit_u64(v), + Content::I8(v) => visitor.visit_i8(v), + Content::I16(v) => visitor.visit_i16(v), + Content::I32(v) => visitor.visit_i32(v), + Content::I64(v) => visitor.visit_i64(v), + _ => Err(self.invalid_type(&visitor)), + } + } + } + + fn visit_content_seq_ref<'a, 'de, V, E>( + content: &'a [Content<'de>], + visitor: V, + ) -> Result<V::Value, E> + where + V: Visitor<'de>, + E: de::Error, + { + let seq = content.iter().map(ContentRefDeserializer::new); + let mut seq_visitor = de::value::SeqDeserializer::new(seq); + let value = try!(visitor.visit_seq(&mut seq_visitor)); + try!(seq_visitor.end()); + Ok(value) + } + + fn visit_content_map_ref<'a, 'de, V, E>( + content: &'a [(Content<'de>, Content<'de>)], + visitor: V, + ) -> Result<V::Value, E> + where + V: Visitor<'de>, + E: de::Error, + { + let map = content.iter().map(|&(ref k, ref v)| { + ( + ContentRefDeserializer::new(k), + ContentRefDeserializer::new(v), + ) + }); + let mut map_visitor = de::value::MapDeserializer::new(map); + let value = try!(visitor.visit_map(&mut map_visitor)); + try!(map_visitor.end()); + Ok(value) + } + + /// Used when deserializing an untagged enum because the content may need + /// to be used more than once. + impl<'de, 'a, E> Deserializer<'de> for ContentRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match *self.content { + Content::Bool(v) => visitor.visit_bool(v), + Content::U8(v) => visitor.visit_u8(v), + Content::U16(v) => visitor.visit_u16(v), + Content::U32(v) => visitor.visit_u32(v), + Content::U64(v) => visitor.visit_u64(v), + Content::I8(v) => visitor.visit_i8(v), + Content::I16(v) => visitor.visit_i16(v), + Content::I32(v) => visitor.visit_i32(v), + Content::I64(v) => visitor.visit_i64(v), + Content::F32(v) => visitor.visit_f32(v), + Content::F64(v) => visitor.visit_f64(v), + Content::Char(v) => visitor.visit_char(v), + Content::String(ref v) => visitor.visit_str(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(ref v) => visitor.visit_bytes(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + Content::Unit => visitor.visit_unit(), + Content::None => visitor.visit_none(), + Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)), + Content::Newtype(ref v) => { + visitor.visit_newtype_struct(ContentRefDeserializer::new(v)) + } + Content::Seq(ref v) => visit_content_seq_ref(v, visitor), + Content::Map(ref v) => visit_content_map_ref(v, visitor), + } + } + + fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::Bool(v) => visitor.visit_bool(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_integer(visitor) + } + + fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_float(visitor) + } + + fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_float(visitor) + } + + fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::Char(v) => visitor.visit_char(v), + Content::String(ref v) => visitor.visit_str(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::String(ref v) => visitor.visit_str(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(ref v) => visitor.visit_bytes(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_str(visitor) + } + + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::String(ref v) => visitor.visit_str(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(ref v) => visitor.visit_bytes(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + Content::Seq(ref v) => visit_content_seq_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_bytes(visitor) + } + + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match *self.content { + Content::None => visitor.visit_none(), + Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)), + Content::Unit => visitor.visit_unit(), + _ => visitor.visit_some(self), + } + } + + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::Unit => visitor.visit_unit(), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_unit_struct<V>( + self, + _name: &'static str, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_unit(visitor) + } + + fn deserialize_newtype_struct<V>(self, _name: &str, visitor: V) -> Result<V::Value, E> + where + V: Visitor<'de>, + { + match *self.content { + Content::Newtype(ref v) => { + visitor.visit_newtype_struct(ContentRefDeserializer::new(v)) + } + _ => visitor.visit_newtype_struct(self), + } + } + + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::Seq(ref v) => visit_content_seq_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_tuple_struct<V>( + self, + _name: &'static str, + _len: usize, + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::Map(ref v) => visit_content_map_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_struct<V>( + self, + _name: &'static str, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::Seq(ref v) => visit_content_seq_ref(v, visitor), + Content::Map(ref v) => visit_content_map_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + let (variant, value) = match *self.content { + Content::Map(ref value) => { + let mut iter = value.iter(); + let &(ref variant, ref value) = match iter.next() { + Some(v) => v, + None => { + return Err(de::Error::invalid_value( + de::Unexpected::Map, + &"map with a single key", + )); + } + }; + // enums are encoded in json as maps with a single key:value pair + if iter.next().is_some() { + return Err(de::Error::invalid_value( + de::Unexpected::Map, + &"map with a single key", + )); + } + (variant, Some(value)) + } + ref s @ Content::String(_) | ref s @ Content::Str(_) => (s, None), + ref other => { + return Err(de::Error::invalid_type( + other.unexpected(), + &"string or map", + )); + } + }; + + visitor.visit_enum(EnumRefDeserializer { + variant: variant, + value: value, + err: PhantomData, + }) + } + + fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match *self.content { + Content::String(ref v) => visitor.visit_str(v), + Content::Str(v) => visitor.visit_borrowed_str(v), + Content::ByteBuf(ref v) => visitor.visit_bytes(v), + Content::Bytes(v) => visitor.visit_borrowed_bytes(v), + Content::U8(v) => visitor.visit_u8(v), + Content::U64(v) => visitor.visit_u64(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_unit() + } + + fn __deserialize_content<V>( + self, + _: actually_private::T, + visitor: V, + ) -> Result<Content<'de>, Self::Error> + where + V: Visitor<'de, Value = Content<'de>>, + { + let _ = visitor; + Ok(self.content.clone()) + } + } + + impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E> { + /// private API, don't use + pub fn new(content: &'a Content<'de>) -> Self { + ContentRefDeserializer { + content: content, + err: PhantomData, + } + } + } + + struct EnumRefDeserializer<'a, 'de: 'a, E> + where + E: de::Error, + { + variant: &'a Content<'de>, + value: Option<&'a Content<'de>>, + err: PhantomData<E>, + } + + impl<'de, 'a, E> de::EnumAccess<'de> for EnumRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + type Variant = VariantRefDeserializer<'a, 'de, Self::Error>; + + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error> + where + V: de::DeserializeSeed<'de>, + { + let visitor = VariantRefDeserializer { + value: self.value, + err: PhantomData, + }; + seed.deserialize(ContentRefDeserializer::new(self.variant)) + .map(|v| (v, visitor)) + } + } + + struct VariantRefDeserializer<'a, 'de: 'a, E> + where + E: de::Error, + { + value: Option<&'a Content<'de>>, + err: PhantomData<E>, + } + + impl<'de, 'a, E> de::VariantAccess<'de> for VariantRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + + fn unit_variant(self) -> Result<(), E> { + match self.value { + Some(value) => de::Deserialize::deserialize(ContentRefDeserializer::new(value)), + None => Ok(()), + } + } + + fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, E> + where + T: de::DeserializeSeed<'de>, + { + match self.value { + Some(value) => seed.deserialize(ContentRefDeserializer::new(value)), + None => Err(de::Error::invalid_type( + de::Unexpected::UnitVariant, + &"newtype variant", + )), + } + } + + fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + match self.value { + Some(&Content::Seq(ref v)) => { + de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor) + } + Some(other) => Err(de::Error::invalid_type( + other.unexpected(), + &"tuple variant", + )), + None => Err(de::Error::invalid_type( + de::Unexpected::UnitVariant, + &"tuple variant", + )), + } + } + + fn struct_variant<V>( + self, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + match self.value { + Some(&Content::Map(ref v)) => { + de::Deserializer::deserialize_any(MapRefDeserializer::new(v), visitor) + } + Some(&Content::Seq(ref v)) => { + de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor) + } + Some(other) => Err(de::Error::invalid_type( + other.unexpected(), + &"struct variant", + )), + None => Err(de::Error::invalid_type( + de::Unexpected::UnitVariant, + &"struct variant", + )), + } + } + } + + struct SeqRefDeserializer<'a, 'de: 'a, E> + where + E: de::Error, + { + iter: <&'a [Content<'de>] as IntoIterator>::IntoIter, + err: PhantomData<E>, + } + + impl<'a, 'de, E> SeqRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + fn new(slice: &'a [Content<'de>]) -> Self { + SeqRefDeserializer { + iter: slice.iter(), + err: PhantomData, + } + } + } + + impl<'de, 'a, E> de::Deserializer<'de> for SeqRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + + #[inline] + fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + let len = self.iter.len(); + if len == 0 { + visitor.visit_unit() + } else { + let ret = try!(visitor.visit_seq(&mut self)); + let remaining = self.iter.len(); + if remaining == 0 { + Ok(ret) + } else { + Err(de::Error::invalid_length(len, &"fewer elements in array")) + } + } + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } + } + + impl<'de, 'a, E> de::SeqAccess<'de> for SeqRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.iter.next() { + Some(value) => seed + .deserialize(ContentRefDeserializer::new(value)) + .map(Some), + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } + } + + struct MapRefDeserializer<'a, 'de: 'a, E> + where + E: de::Error, + { + iter: <&'a [(Content<'de>, Content<'de>)] as IntoIterator>::IntoIter, + value: Option<&'a Content<'de>>, + err: PhantomData<E>, + } + + impl<'a, 'de, E> MapRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + fn new(map: &'a [(Content<'de>, Content<'de>)]) -> Self { + MapRefDeserializer { + iter: map.iter(), + value: None, + err: PhantomData, + } + } + } + + impl<'de, 'a, E> de::MapAccess<'de> for MapRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.iter.next() { + Some(&(ref key, ref value)) => { + self.value = Some(value); + seed.deserialize(ContentRefDeserializer::new(key)).map(Some) + } + None => Ok(None), + } + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: de::DeserializeSeed<'de>, + { + match self.value.take() { + Some(value) => seed.deserialize(ContentRefDeserializer::new(value)), + None => Err(de::Error::custom("value is missing")), + } + } + + fn size_hint(&self) -> Option<usize> { + size_hint::from_bounds(&self.iter) + } + } + + impl<'de, 'a, E> de::Deserializer<'de> for MapRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Error = E; + + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: de::Visitor<'de>, + { + visitor.visit_map(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } + } + + impl<'de, E> de::IntoDeserializer<'de, E> for ContentDeserializer<'de, E> + where + E: de::Error, + { + type Deserializer = Self; + + fn into_deserializer(self) -> Self { + self + } + } + + impl<'de, 'a, E> de::IntoDeserializer<'de, E> for ContentRefDeserializer<'a, 'de, E> + where + E: de::Error, + { + type Deserializer = Self; + + fn into_deserializer(self) -> Self { + self + } + } + + /// Visitor for deserializing an internally tagged unit variant. + /// + /// Not public API. + pub struct InternallyTaggedUnitVisitor<'a> { + type_name: &'a str, + variant_name: &'a str, + } + + impl<'a> InternallyTaggedUnitVisitor<'a> { + /// Not public API. + pub fn new(type_name: &'a str, variant_name: &'a str) -> Self { + InternallyTaggedUnitVisitor { + type_name: type_name, + variant_name: variant_name, + } + } + } + + impl<'de, 'a> Visitor<'de> for InternallyTaggedUnitVisitor<'a> { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!( + formatter, + "unit variant {}::{}", + self.type_name, self.variant_name + ) + } + + fn visit_seq<S>(self, _: S) -> Result<(), S::Error> + where + S: SeqAccess<'de>, + { + Ok(()) + } + + fn visit_map<M>(self, mut access: M) -> Result<(), M::Error> + where + M: MapAccess<'de>, + { + while try!(access.next_entry::<IgnoredAny, IgnoredAny>()).is_some() {} + Ok(()) + } + } + + /// Visitor for deserializing an untagged unit variant. + /// + /// Not public API. + pub struct UntaggedUnitVisitor<'a> { + type_name: &'a str, + variant_name: &'a str, + } + + impl<'a> UntaggedUnitVisitor<'a> { + /// Not public API. + pub fn new(type_name: &'a str, variant_name: &'a str) -> Self { + UntaggedUnitVisitor { + type_name: type_name, + variant_name: variant_name, + } + } + } + + impl<'de, 'a> Visitor<'de> for UntaggedUnitVisitor<'a> { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!( + formatter, + "unit variant {}::{}", + self.type_name, self.variant_name + ) + } + + fn visit_unit<E>(self) -> Result<(), E> + where + E: de::Error, + { + Ok(()) + } + + fn visit_none<E>(self) -> Result<(), E> + where + E: de::Error, + { + Ok(()) + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +// Like `IntoDeserializer` but also implemented for `&[u8]`. This is used for +// the newtype fallthrough case of `field_identifier`. +// +// #[derive(Deserialize)] +// #[serde(field_identifier)] +// enum F { +// A, +// B, +// Other(String), // deserialized using IdentifierDeserializer +// } +pub trait IdentifierDeserializer<'de, E: Error> { + type Deserializer: Deserializer<'de, Error = E>; + + fn from(self) -> Self::Deserializer; +} + +pub struct Borrowed<'de, T: 'de + ?Sized>(pub &'de T); + +impl<'de, E> IdentifierDeserializer<'de, E> for u64 +where + E: Error, +{ + type Deserializer = <u64 as IntoDeserializer<'de, E>>::Deserializer; + + fn from(self) -> Self::Deserializer { + self.into_deserializer() + } +} + +pub struct StrDeserializer<'a, E> { + value: &'a str, + marker: PhantomData<E>, +} + +impl<'de, 'a, E> Deserializer<'de> for StrDeserializer<'a, E> +where + E: Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_str(self.value) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +pub struct BorrowedStrDeserializer<'de, E> { + value: &'de str, + marker: PhantomData<E>, +} + +impl<'de, E> Deserializer<'de> for BorrowedStrDeserializer<'de, E> +where + E: Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_borrowed_str(self.value) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct enum identifier ignored_any + } +} + +impl<'a, E> IdentifierDeserializer<'a, E> for &'a str +where + E: Error, +{ + type Deserializer = StrDeserializer<'a, E>; + + fn from(self) -> Self::Deserializer { + StrDeserializer { + value: self, + marker: PhantomData, + } + } +} + +impl<'de, E> IdentifierDeserializer<'de, E> for Borrowed<'de, str> +where + E: Error, +{ + type Deserializer = BorrowedStrDeserializer<'de, E>; + + fn from(self) -> Self::Deserializer { + BorrowedStrDeserializer { + value: self.0, + marker: PhantomData, + } + } +} + +impl<'a, E> IdentifierDeserializer<'a, E> for &'a [u8] +where + E: Error, +{ + type Deserializer = BytesDeserializer<'a, E>; + + fn from(self) -> Self::Deserializer { + BytesDeserializer::new(self) + } +} + +impl<'de, E> IdentifierDeserializer<'de, E> for Borrowed<'de, [u8]> +where + E: Error, +{ + type Deserializer = BorrowedBytesDeserializer<'de, E>; + + fn from(self) -> Self::Deserializer { + BorrowedBytesDeserializer::new(self.0) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatMapDeserializer<'a, 'de: 'a, E>( + pub &'a mut Vec<Option<(Content<'de>, Content<'de>)>>, + pub PhantomData<E>, +); + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> FlatMapDeserializer<'a, 'de, E> +where + E: Error, +{ + fn deserialize_other<V>() -> Result<V, E> { + Err(Error::custom("can only flatten structs and maps")) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +macro_rules! forward_to_deserialize_other { + ($($func:ident ( $($arg:ty),* ))*) => { + $( + fn $func<V>(self, $(_: $arg,)* _visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + Self::deserialize_other() + } + )* + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> Deserializer<'de> for FlatMapDeserializer<'a, 'de, E> +where + E: Error, +{ + type Error = E; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_map(FlatInternallyTaggedAccess { + iter: self.0.iter_mut(), + pending: None, + _marker: PhantomData, + }) + } + + fn deserialize_enum<V>( + self, + name: &'static str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + for item in self.0.iter_mut() { + // items in the vector are nulled out when used. So we can only use + // an item if it's still filled in and if the field is one we care + // about. + let use_item = match *item { + None => false, + Some((ref c, _)) => c.as_str().map_or(false, |x| variants.contains(&x)), + }; + + if use_item { + let (key, value) = item.take().unwrap(); + return visitor.visit_enum(EnumDeserializer::new(key, Some(value))); + } + } + + Err(Error::custom(format_args!( + "no variant of enum {} found in flattened data", + name + ))) + } + + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_map(FlatMapAccess::new(self.0.iter())) + } + + fn deserialize_struct<V>( + self, + _: &'static str, + fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_map(FlatStructAccess::new(self.0.iter_mut(), fields)) + } + + fn deserialize_newtype_struct<V>(self, _name: &str, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_newtype_struct(self) + } + + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + match visitor.__private_visit_untagged_option(self) { + Ok(value) => Ok(value), + Err(()) => Self::deserialize_other(), + } + } + + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error> + where + V: Visitor<'de>, + { + visitor.visit_unit() + } + + forward_to_deserialize_other! { + deserialize_bool() + deserialize_i8() + deserialize_i16() + deserialize_i32() + deserialize_i64() + deserialize_u8() + deserialize_u16() + deserialize_u32() + deserialize_u64() + deserialize_f32() + deserialize_f64() + deserialize_char() + deserialize_str() + deserialize_string() + deserialize_bytes() + deserialize_byte_buf() + deserialize_unit_struct(&'static str) + deserialize_seq() + deserialize_tuple(usize) + deserialize_tuple_struct(&'static str, usize) + deserialize_identifier() + deserialize_ignored_any() + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatMapAccess<'a, 'de: 'a, E> { + iter: slice::Iter<'a, Option<(Content<'de>, Content<'de>)>>, + pending_content: Option<&'a Content<'de>>, + _marker: PhantomData<E>, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> FlatMapAccess<'a, 'de, E> { + fn new( + iter: slice::Iter<'a, Option<(Content<'de>, Content<'de>)>>, + ) -> FlatMapAccess<'a, 'de, E> { + FlatMapAccess { + iter: iter, + pending_content: None, + _marker: PhantomData, + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> MapAccess<'de> for FlatMapAccess<'a, 'de, E> +where + E: Error, +{ + type Error = E; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: DeserializeSeed<'de>, + { + for item in &mut self.iter { + // Items in the vector are nulled out when used by a struct. + if let Some((ref key, ref content)) = *item { + self.pending_content = Some(content); + return seed.deserialize(ContentRefDeserializer::new(key)).map(Some); + } + } + Ok(None) + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: DeserializeSeed<'de>, + { + match self.pending_content.take() { + Some(value) => seed.deserialize(ContentRefDeserializer::new(value)), + None => Err(Error::custom("value is missing")), + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatStructAccess<'a, 'de: 'a, E> { + iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>, + pending_content: Option<Content<'de>>, + fields: &'static [&'static str], + _marker: PhantomData<E>, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> FlatStructAccess<'a, 'de, E> { + fn new( + iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>, + fields: &'static [&'static str], + ) -> FlatStructAccess<'a, 'de, E> { + FlatStructAccess { + iter: iter, + pending_content: None, + fields: fields, + _marker: PhantomData, + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> MapAccess<'de> for FlatStructAccess<'a, 'de, E> +where + E: Error, +{ + type Error = E; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: DeserializeSeed<'de>, + { + while let Some(item) = self.iter.next() { + // items in the vector are nulled out when used. So we can only use + // an item if it's still filled in and if the field is one we care + // about. In case we do not know which fields we want, we take them all. + let use_item = match *item { + None => false, + Some((ref c, _)) => c.as_str().map_or(false, |key| self.fields.contains(&key)), + }; + + if use_item { + let (key, content) = item.take().unwrap(); + self.pending_content = Some(content); + return seed.deserialize(ContentDeserializer::new(key)).map(Some); + } + } + Ok(None) + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: DeserializeSeed<'de>, + { + match self.pending_content.take() { + Some(value) => seed.deserialize(ContentDeserializer::new(value)), + None => Err(Error::custom("value is missing")), + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatInternallyTaggedAccess<'a, 'de: 'a, E> { + iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>, + pending: Option<&'a Content<'de>>, + _marker: PhantomData<E>, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, 'de, E> MapAccess<'de> for FlatInternallyTaggedAccess<'a, 'de, E> +where + E: Error, +{ + type Error = E; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> + where + T: DeserializeSeed<'de>, + { + for item in &mut self.iter { + if let Some((ref key, ref content)) = *item { + // Do not take(), instead borrow this entry. The internally tagged + // enum does its own buffering so we can't tell whether this entry + // is going to be consumed. Borrowing here leaves the entry + // available for later flattened fields. + self.pending = Some(content); + return seed.deserialize(ContentRefDeserializer::new(key)).map(Some); + } + } + Ok(None) + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> + where + T: DeserializeSeed<'de>, + { + match self.pending.take() { + Some(value) => seed.deserialize(ContentRefDeserializer::new(value)), + None => panic!("value is missing"), + } + } +} diff --git a/vendor/serde/src/private/doc.rs b/vendor/serde/src/private/doc.rs new file mode 100644 index 000000000..f597af844 --- /dev/null +++ b/vendor/serde/src/private/doc.rs @@ -0,0 +1,159 @@ +// Used only by Serde doc tests. Not public API. + +use lib::*; + +use ser; + +#[doc(hidden)] +#[derive(Debug)] +pub struct Error; + +impl ser::Error for Error { + fn custom<T>(_: T) -> Self + where + T: Display, + { + unimplemented!() + } +} + +#[cfg(feature = "std")] +impl error::Error for Error { + fn description(&self) -> &str { + unimplemented!() + } +} + +impl Display for Error { + fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result { + unimplemented!() + } +} + +#[doc(hidden)] +#[macro_export] +macro_rules! __private_serialize { + () => { + trait Serialize { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: $crate::Serializer; + } + }; +} + +#[doc(hidden)] +#[macro_export(local_inner_macros)] +macro_rules! __serialize_unimplemented { + ($($func:ident)*) => { + $( + __serialize_unimplemented_helper!($func); + )* + }; +} + +#[doc(hidden)] +#[macro_export] +macro_rules! __serialize_unimplemented_method { + ($func:ident $(<$t:ident>)* ($($arg:ty),*) -> $ret:ident) => { + fn $func $(<$t: ?Sized + $crate::Serialize>)* (self $(, _: $arg)*) -> $crate::__private::Result<Self::$ret, Self::Error> { + unimplemented!() + } + }; +} + +#[doc(hidden)] +#[macro_export(local_inner_macros)] +macro_rules! __serialize_unimplemented_helper { + (bool) => { + __serialize_unimplemented_method!(serialize_bool(bool) -> Ok); + }; + (i8) => { + __serialize_unimplemented_method!(serialize_i8(i8) -> Ok); + }; + (i16) => { + __serialize_unimplemented_method!(serialize_i16(i16) -> Ok); + }; + (i32) => { + __serialize_unimplemented_method!(serialize_i32(i32) -> Ok); + }; + (i64) => { + __serialize_unimplemented_method!(serialize_i64(i64) -> Ok); + }; + (u8) => { + __serialize_unimplemented_method!(serialize_u8(u8) -> Ok); + }; + (u16) => { + __serialize_unimplemented_method!(serialize_u16(u16) -> Ok); + }; + (u32) => { + __serialize_unimplemented_method!(serialize_u32(u32) -> Ok); + }; + (u64) => { + __serialize_unimplemented_method!(serialize_u64(u64) -> Ok); + }; + (f32) => { + __serialize_unimplemented_method!(serialize_f32(f32) -> Ok); + }; + (f64) => { + __serialize_unimplemented_method!(serialize_f64(f64) -> Ok); + }; + (char) => { + __serialize_unimplemented_method!(serialize_char(char) -> Ok); + }; + (str) => { + __serialize_unimplemented_method!(serialize_str(&str) -> Ok); + }; + (bytes) => { + __serialize_unimplemented_method!(serialize_bytes(&[u8]) -> Ok); + }; + (none) => { + __serialize_unimplemented_method!(serialize_none() -> Ok); + }; + (some) => { + __serialize_unimplemented_method!(serialize_some<T>(&T) -> Ok); + }; + (unit) => { + __serialize_unimplemented_method!(serialize_unit() -> Ok); + }; + (unit_struct) => { + __serialize_unimplemented_method!(serialize_unit_struct(&str) -> Ok); + }; + (unit_variant) => { + __serialize_unimplemented_method!(serialize_unit_variant(&str, u32, &str) -> Ok); + }; + (newtype_struct) => { + __serialize_unimplemented_method!(serialize_newtype_struct<T>(&str, &T) -> Ok); + }; + (newtype_variant) => { + __serialize_unimplemented_method!(serialize_newtype_variant<T>(&str, u32, &str, &T) -> Ok); + }; + (seq) => { + type SerializeSeq = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_seq(Option<usize>) -> SerializeSeq); + }; + (tuple) => { + type SerializeTuple = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_tuple(usize) -> SerializeTuple); + }; + (tuple_struct) => { + type SerializeTupleStruct = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_tuple_struct(&str, usize) -> SerializeTupleStruct); + }; + (tuple_variant) => { + type SerializeTupleVariant = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_tuple_variant(&str, u32, &str, usize) -> SerializeTupleVariant); + }; + (map) => { + type SerializeMap = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_map(Option<usize>) -> SerializeMap); + }; + (struct) => { + type SerializeStruct = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_struct(&str, usize) -> SerializeStruct); + }; + (struct_variant) => { + type SerializeStructVariant = $crate::ser::Impossible<Self::Ok, Self::Error>; + __serialize_unimplemented_method!(serialize_struct_variant(&str, u32, &str, usize) -> SerializeStructVariant); + }; +} diff --git a/vendor/serde/src/private/mod.rs b/vendor/serde/src/private/mod.rs new file mode 100644 index 000000000..e89690236 --- /dev/null +++ b/vendor/serde/src/private/mod.rs @@ -0,0 +1,50 @@ +#[cfg(not(no_serde_derive))] +pub mod de; +#[cfg(not(no_serde_derive))] +pub mod ser; + +pub mod size_hint; + +// FIXME: #[cfg(doctest)] once https://github.com/rust-lang/rust/issues/67295 is fixed. +pub mod doc; + +pub use lib::clone::Clone; +pub use lib::convert::{From, Into}; +pub use lib::default::Default; +pub use lib::fmt::{self, Formatter}; +pub use lib::marker::PhantomData; +pub use lib::option::Option::{self, None, Some}; +pub use lib::ptr; +pub use lib::result::Result::{self, Err, Ok}; + +pub use self::string::from_utf8_lossy; + +#[cfg(any(feature = "alloc", feature = "std"))] +pub use lib::{ToString, Vec}; + +#[cfg(not(no_core_try_from))] +pub use lib::convert::TryFrom; + +mod string { + use lib::*; + + #[cfg(any(feature = "std", feature = "alloc"))] + pub fn from_utf8_lossy(bytes: &[u8]) -> Cow<str> { + String::from_utf8_lossy(bytes) + } + + // The generated code calls this like: + // + // let value = &_serde::__private::from_utf8_lossy(bytes); + // Err(_serde::de::Error::unknown_variant(value, VARIANTS)) + // + // so it is okay for the return type to be different from the std case as long + // as the above works. + #[cfg(not(any(feature = "std", feature = "alloc")))] + pub fn from_utf8_lossy(bytes: &[u8]) -> &str { + // Three unicode replacement characters if it fails. They look like a + // white-on-black question mark. The user will recognize it as invalid + // UTF-8. + str::from_utf8(bytes).unwrap_or("\u{fffd}\u{fffd}\u{fffd}") + } +} diff --git a/vendor/serde/src/private/ser.rs b/vendor/serde/src/private/ser.rs new file mode 100644 index 000000000..6ee999389 --- /dev/null +++ b/vendor/serde/src/private/ser.rs @@ -0,0 +1,1310 @@ +use lib::*; + +use ser::{self, Impossible, Serialize, SerializeMap, SerializeStruct, Serializer}; + +#[cfg(any(feature = "std", feature = "alloc"))] +use self::content::{ + Content, ContentSerializer, SerializeStructVariantAsMapValue, SerializeTupleVariantAsMapValue, +}; + +/// Used to check that serde(getter) attributes return the expected type. +/// Not public API. +pub fn constrain<T: ?Sized>(t: &T) -> &T { + t +} + +/// Not public API. +pub fn serialize_tagged_newtype<S, T>( + serializer: S, + type_ident: &'static str, + variant_ident: &'static str, + tag: &'static str, + variant_name: &'static str, + value: &T, +) -> Result<S::Ok, S::Error> +where + S: Serializer, + T: Serialize, +{ + value.serialize(TaggedSerializer { + type_ident: type_ident, + variant_ident: variant_ident, + tag: tag, + variant_name: variant_name, + delegate: serializer, + }) +} + +struct TaggedSerializer<S> { + type_ident: &'static str, + variant_ident: &'static str, + tag: &'static str, + variant_name: &'static str, + delegate: S, +} + +enum Unsupported { + Boolean, + Integer, + Float, + Char, + String, + ByteArray, + Optional, + Unit, + #[cfg(any(feature = "std", feature = "alloc"))] + UnitStruct, + Sequence, + Tuple, + TupleStruct, + Enum, +} + +impl Display for Unsupported { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + match *self { + Unsupported::Boolean => formatter.write_str("a boolean"), + Unsupported::Integer => formatter.write_str("an integer"), + Unsupported::Float => formatter.write_str("a float"), + Unsupported::Char => formatter.write_str("a char"), + Unsupported::String => formatter.write_str("a string"), + Unsupported::ByteArray => formatter.write_str("a byte array"), + Unsupported::Optional => formatter.write_str("an optional"), + Unsupported::Unit => formatter.write_str("unit"), + #[cfg(any(feature = "std", feature = "alloc"))] + Unsupported::UnitStruct => formatter.write_str("unit struct"), + Unsupported::Sequence => formatter.write_str("a sequence"), + Unsupported::Tuple => formatter.write_str("a tuple"), + Unsupported::TupleStruct => formatter.write_str("a tuple struct"), + Unsupported::Enum => formatter.write_str("an enum"), + } + } +} + +impl<S> TaggedSerializer<S> +where + S: Serializer, +{ + fn bad_type(self, what: Unsupported) -> S::Error { + ser::Error::custom(format_args!( + "cannot serialize tagged newtype variant {}::{} containing {}", + self.type_ident, self.variant_ident, what + )) + } +} + +impl<S> Serializer for TaggedSerializer<S> +where + S: Serializer, +{ + type Ok = S::Ok; + type Error = S::Error; + + type SerializeSeq = Impossible<S::Ok, S::Error>; + type SerializeTuple = Impossible<S::Ok, S::Error>; + type SerializeTupleStruct = Impossible<S::Ok, S::Error>; + type SerializeMap = S::SerializeMap; + type SerializeStruct = S::SerializeStruct; + + #[cfg(not(any(feature = "std", feature = "alloc")))] + type SerializeTupleVariant = Impossible<S::Ok, S::Error>; + #[cfg(any(feature = "std", feature = "alloc"))] + type SerializeTupleVariant = SerializeTupleVariantAsMapValue<S::SerializeMap>; + + #[cfg(not(any(feature = "std", feature = "alloc")))] + type SerializeStructVariant = Impossible<S::Ok, S::Error>; + #[cfg(any(feature = "std", feature = "alloc"))] + type SerializeStructVariant = SerializeStructVariantAsMapValue<S::SerializeMap>; + + fn serialize_bool(self, _: bool) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Boolean)) + } + + fn serialize_i8(self, _: i8) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_i16(self, _: i16) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_i32(self, _: i32) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_i64(self, _: i64) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_u8(self, _: u8) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_u16(self, _: u16) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_u32(self, _: u32) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_u64(self, _: u64) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Integer)) + } + + fn serialize_f32(self, _: f32) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Float)) + } + + fn serialize_f64(self, _: f64) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Float)) + } + + fn serialize_char(self, _: char) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Char)) + } + + fn serialize_str(self, _: &str) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::String)) + } + + fn serialize_bytes(self, _: &[u8]) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::ByteArray)) + } + + fn serialize_none(self) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Optional)) + } + + fn serialize_some<T: ?Sized>(self, _: &T) -> Result<Self::Ok, Self::Error> + where + T: Serialize, + { + Err(self.bad_type(Unsupported::Optional)) + } + + fn serialize_unit(self) -> Result<Self::Ok, Self::Error> { + Err(self.bad_type(Unsupported::Unit)) + } + + fn serialize_unit_struct(self, _: &'static str) -> Result<Self::Ok, Self::Error> { + let mut map = try!(self.delegate.serialize_map(Some(1))); + try!(map.serialize_entry(self.tag, self.variant_name)); + map.end() + } + + fn serialize_unit_variant( + self, + _: &'static str, + _: u32, + inner_variant: &'static str, + ) -> Result<Self::Ok, Self::Error> { + let mut map = try!(self.delegate.serialize_map(Some(2))); + try!(map.serialize_entry(self.tag, self.variant_name)); + try!(map.serialize_entry(inner_variant, &())); + map.end() + } + + fn serialize_newtype_struct<T: ?Sized>( + self, + _: &'static str, + value: &T, + ) -> Result<Self::Ok, Self::Error> + where + T: Serialize, + { + value.serialize(self) + } + + fn serialize_newtype_variant<T: ?Sized>( + self, + _: &'static str, + _: u32, + inner_variant: &'static str, + inner_value: &T, + ) -> Result<Self::Ok, Self::Error> + where + T: Serialize, + { + let mut map = try!(self.delegate.serialize_map(Some(2))); + try!(map.serialize_entry(self.tag, self.variant_name)); + try!(map.serialize_entry(inner_variant, inner_value)); + map.end() + } + + fn serialize_seq(self, _: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> { + Err(self.bad_type(Unsupported::Sequence)) + } + + fn serialize_tuple(self, _: usize) -> Result<Self::SerializeTuple, Self::Error> { + Err(self.bad_type(Unsupported::Tuple)) + } + + fn serialize_tuple_struct( + self, + _: &'static str, + _: usize, + ) -> Result<Self::SerializeTupleStruct, Self::Error> { + Err(self.bad_type(Unsupported::TupleStruct)) + } + + #[cfg(not(any(feature = "std", feature = "alloc")))] + fn serialize_tuple_variant( + self, + _: &'static str, + _: u32, + _: &'static str, + _: usize, + ) -> Result<Self::SerializeTupleVariant, Self::Error> { + // Lack of push-based serialization means we need to buffer the content + // of the tuple variant, so it requires std. + Err(self.bad_type(Unsupported::Enum)) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + fn serialize_tuple_variant( + self, + _: &'static str, + _: u32, + inner_variant: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleVariant, Self::Error> { + let mut map = try!(self.delegate.serialize_map(Some(2))); + try!(map.serialize_entry(self.tag, self.variant_name)); + try!(map.serialize_key(inner_variant)); + Ok(SerializeTupleVariantAsMapValue::new( + map, + inner_variant, + len, + )) + } + + fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> { + let mut map = try!(self.delegate.serialize_map(len.map(|len| len + 1))); + try!(map.serialize_entry(self.tag, self.variant_name)); + Ok(map) + } + + fn serialize_struct( + self, + name: &'static str, + len: usize, + ) -> Result<Self::SerializeStruct, Self::Error> { + let mut state = try!(self.delegate.serialize_struct(name, len + 1)); + try!(state.serialize_field(self.tag, self.variant_name)); + Ok(state) + } + + #[cfg(not(any(feature = "std", feature = "alloc")))] + fn serialize_struct_variant( + self, + _: &'static str, + _: u32, + _: &'static str, + _: usize, + ) -> Result<Self::SerializeStructVariant, Self::Error> { + // Lack of push-based serialization means we need to buffer the content + // of the struct variant, so it requires std. + Err(self.bad_type(Unsupported::Enum)) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + fn serialize_struct_variant( + self, + _: &'static str, + _: u32, + inner_variant: &'static str, + len: usize, + ) -> Result<Self::SerializeStructVariant, Self::Error> { + let mut map = try!(self.delegate.serialize_map(Some(2))); + try!(map.serialize_entry(self.tag, self.variant_name)); + try!(map.serialize_key(inner_variant)); + Ok(SerializeStructVariantAsMapValue::new( + map, + inner_variant, + len, + )) + } + + #[cfg(not(any(feature = "std", feature = "alloc")))] + fn collect_str<T: ?Sized>(self, _: &T) -> Result<Self::Ok, Self::Error> + where + T: Display, + { + Err(self.bad_type(Unsupported::String)) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +mod content { + use lib::*; + + use ser::{self, Serialize, Serializer}; + + pub struct SerializeTupleVariantAsMapValue<M> { + map: M, + name: &'static str, + fields: Vec<Content>, + } + + impl<M> SerializeTupleVariantAsMapValue<M> { + pub fn new(map: M, name: &'static str, len: usize) -> Self { + SerializeTupleVariantAsMapValue { + map: map, + name: name, + fields: Vec::with_capacity(len), + } + } + } + + impl<M> ser::SerializeTupleVariant for SerializeTupleVariantAsMapValue<M> + where + M: ser::SerializeMap, + { + type Ok = M::Ok; + type Error = M::Error; + + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), M::Error> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<M::Error>::new())); + self.fields.push(value); + Ok(()) + } + + fn end(mut self) -> Result<M::Ok, M::Error> { + try!(self + .map + .serialize_value(&Content::TupleStruct(self.name, self.fields))); + self.map.end() + } + } + + pub struct SerializeStructVariantAsMapValue<M> { + map: M, + name: &'static str, + fields: Vec<(&'static str, Content)>, + } + + impl<M> SerializeStructVariantAsMapValue<M> { + pub fn new(map: M, name: &'static str, len: usize) -> Self { + SerializeStructVariantAsMapValue { + map: map, + name: name, + fields: Vec::with_capacity(len), + } + } + } + + impl<M> ser::SerializeStructVariant for SerializeStructVariantAsMapValue<M> + where + M: ser::SerializeMap, + { + type Ok = M::Ok; + type Error = M::Error; + + fn serialize_field<T: ?Sized>( + &mut self, + key: &'static str, + value: &T, + ) -> Result<(), M::Error> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<M::Error>::new())); + self.fields.push((key, value)); + Ok(()) + } + + fn end(mut self) -> Result<M::Ok, M::Error> { + try!(self + .map + .serialize_value(&Content::Struct(self.name, self.fields))); + self.map.end() + } + } + + pub enum Content { + Bool(bool), + + U8(u8), + U16(u16), + U32(u32), + U64(u64), + + I8(i8), + I16(i16), + I32(i32), + I64(i64), + + F32(f32), + F64(f64), + + Char(char), + String(String), + Bytes(Vec<u8>), + + None, + Some(Box<Content>), + + Unit, + UnitStruct(&'static str), + UnitVariant(&'static str, u32, &'static str), + NewtypeStruct(&'static str, Box<Content>), + NewtypeVariant(&'static str, u32, &'static str, Box<Content>), + + Seq(Vec<Content>), + Tuple(Vec<Content>), + TupleStruct(&'static str, Vec<Content>), + TupleVariant(&'static str, u32, &'static str, Vec<Content>), + Map(Vec<(Content, Content)>), + Struct(&'static str, Vec<(&'static str, Content)>), + StructVariant( + &'static str, + u32, + &'static str, + Vec<(&'static str, Content)>, + ), + } + + impl Serialize for Content { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match *self { + Content::Bool(b) => serializer.serialize_bool(b), + Content::U8(u) => serializer.serialize_u8(u), + Content::U16(u) => serializer.serialize_u16(u), + Content::U32(u) => serializer.serialize_u32(u), + Content::U64(u) => serializer.serialize_u64(u), + Content::I8(i) => serializer.serialize_i8(i), + Content::I16(i) => serializer.serialize_i16(i), + Content::I32(i) => serializer.serialize_i32(i), + Content::I64(i) => serializer.serialize_i64(i), + Content::F32(f) => serializer.serialize_f32(f), + Content::F64(f) => serializer.serialize_f64(f), + Content::Char(c) => serializer.serialize_char(c), + Content::String(ref s) => serializer.serialize_str(s), + Content::Bytes(ref b) => serializer.serialize_bytes(b), + Content::None => serializer.serialize_none(), + Content::Some(ref c) => serializer.serialize_some(&**c), + Content::Unit => serializer.serialize_unit(), + Content::UnitStruct(n) => serializer.serialize_unit_struct(n), + Content::UnitVariant(n, i, v) => serializer.serialize_unit_variant(n, i, v), + Content::NewtypeStruct(n, ref c) => serializer.serialize_newtype_struct(n, &**c), + Content::NewtypeVariant(n, i, v, ref c) => { + serializer.serialize_newtype_variant(n, i, v, &**c) + } + Content::Seq(ref elements) => elements.serialize(serializer), + Content::Tuple(ref elements) => { + use ser::SerializeTuple; + let mut tuple = try!(serializer.serialize_tuple(elements.len())); + for e in elements { + try!(tuple.serialize_element(e)); + } + tuple.end() + } + Content::TupleStruct(n, ref fields) => { + use ser::SerializeTupleStruct; + let mut ts = try!(serializer.serialize_tuple_struct(n, fields.len())); + for f in fields { + try!(ts.serialize_field(f)); + } + ts.end() + } + Content::TupleVariant(n, i, v, ref fields) => { + use ser::SerializeTupleVariant; + let mut tv = try!(serializer.serialize_tuple_variant(n, i, v, fields.len())); + for f in fields { + try!(tv.serialize_field(f)); + } + tv.end() + } + Content::Map(ref entries) => { + use ser::SerializeMap; + let mut map = try!(serializer.serialize_map(Some(entries.len()))); + for &(ref k, ref v) in entries { + try!(map.serialize_entry(k, v)); + } + map.end() + } + Content::Struct(n, ref fields) => { + use ser::SerializeStruct; + let mut s = try!(serializer.serialize_struct(n, fields.len())); + for &(k, ref v) in fields { + try!(s.serialize_field(k, v)); + } + s.end() + } + Content::StructVariant(n, i, v, ref fields) => { + use ser::SerializeStructVariant; + let mut sv = try!(serializer.serialize_struct_variant(n, i, v, fields.len())); + for &(k, ref v) in fields { + try!(sv.serialize_field(k, v)); + } + sv.end() + } + } + } + } + + pub struct ContentSerializer<E> { + error: PhantomData<E>, + } + + impl<E> ContentSerializer<E> { + pub fn new() -> Self { + ContentSerializer { error: PhantomData } + } + } + + impl<E> Serializer for ContentSerializer<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + type SerializeSeq = SerializeSeq<E>; + type SerializeTuple = SerializeTuple<E>; + type SerializeTupleStruct = SerializeTupleStruct<E>; + type SerializeTupleVariant = SerializeTupleVariant<E>; + type SerializeMap = SerializeMap<E>; + type SerializeStruct = SerializeStruct<E>; + type SerializeStructVariant = SerializeStructVariant<E>; + + fn serialize_bool(self, v: bool) -> Result<Content, E> { + Ok(Content::Bool(v)) + } + + fn serialize_i8(self, v: i8) -> Result<Content, E> { + Ok(Content::I8(v)) + } + + fn serialize_i16(self, v: i16) -> Result<Content, E> { + Ok(Content::I16(v)) + } + + fn serialize_i32(self, v: i32) -> Result<Content, E> { + Ok(Content::I32(v)) + } + + fn serialize_i64(self, v: i64) -> Result<Content, E> { + Ok(Content::I64(v)) + } + + fn serialize_u8(self, v: u8) -> Result<Content, E> { + Ok(Content::U8(v)) + } + + fn serialize_u16(self, v: u16) -> Result<Content, E> { + Ok(Content::U16(v)) + } + + fn serialize_u32(self, v: u32) -> Result<Content, E> { + Ok(Content::U32(v)) + } + + fn serialize_u64(self, v: u64) -> Result<Content, E> { + Ok(Content::U64(v)) + } + + fn serialize_f32(self, v: f32) -> Result<Content, E> { + Ok(Content::F32(v)) + } + + fn serialize_f64(self, v: f64) -> Result<Content, E> { + Ok(Content::F64(v)) + } + + fn serialize_char(self, v: char) -> Result<Content, E> { + Ok(Content::Char(v)) + } + + fn serialize_str(self, value: &str) -> Result<Content, E> { + Ok(Content::String(value.to_owned())) + } + + fn serialize_bytes(self, value: &[u8]) -> Result<Content, E> { + Ok(Content::Bytes(value.to_owned())) + } + + fn serialize_none(self) -> Result<Content, E> { + Ok(Content::None) + } + + fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Content, E> + where + T: Serialize, + { + Ok(Content::Some(Box::new(try!(value.serialize(self))))) + } + + fn serialize_unit(self) -> Result<Content, E> { + Ok(Content::Unit) + } + + fn serialize_unit_struct(self, name: &'static str) -> Result<Content, E> { + Ok(Content::UnitStruct(name)) + } + + fn serialize_unit_variant( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + ) -> Result<Content, E> { + Ok(Content::UnitVariant(name, variant_index, variant)) + } + + fn serialize_newtype_struct<T: ?Sized>( + self, + name: &'static str, + value: &T, + ) -> Result<Content, E> + where + T: Serialize, + { + Ok(Content::NewtypeStruct( + name, + Box::new(try!(value.serialize(self))), + )) + } + + fn serialize_newtype_variant<T: ?Sized>( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + value: &T, + ) -> Result<Content, E> + where + T: Serialize, + { + Ok(Content::NewtypeVariant( + name, + variant_index, + variant, + Box::new(try!(value.serialize(self))), + )) + } + + fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, E> { + Ok(SerializeSeq { + elements: Vec::with_capacity(len.unwrap_or(0)), + error: PhantomData, + }) + } + + fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, E> { + Ok(SerializeTuple { + elements: Vec::with_capacity(len), + error: PhantomData, + }) + } + + fn serialize_tuple_struct( + self, + name: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleStruct, E> { + Ok(SerializeTupleStruct { + name: name, + fields: Vec::with_capacity(len), + error: PhantomData, + }) + } + + fn serialize_tuple_variant( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleVariant, E> { + Ok(SerializeTupleVariant { + name: name, + variant_index: variant_index, + variant: variant, + fields: Vec::with_capacity(len), + error: PhantomData, + }) + } + + fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, E> { + Ok(SerializeMap { + entries: Vec::with_capacity(len.unwrap_or(0)), + key: None, + error: PhantomData, + }) + } + + fn serialize_struct( + self, + name: &'static str, + len: usize, + ) -> Result<Self::SerializeStruct, E> { + Ok(SerializeStruct { + name: name, + fields: Vec::with_capacity(len), + error: PhantomData, + }) + } + + fn serialize_struct_variant( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeStructVariant, E> { + Ok(SerializeStructVariant { + name: name, + variant_index: variant_index, + variant: variant, + fields: Vec::with_capacity(len), + error: PhantomData, + }) + } + } + + pub struct SerializeSeq<E> { + elements: Vec<Content>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeSeq for SerializeSeq<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), E> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.elements.push(value); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::Seq(self.elements)) + } + } + + pub struct SerializeTuple<E> { + elements: Vec<Content>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeTuple for SerializeTuple<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), E> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.elements.push(value); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::Tuple(self.elements)) + } + } + + pub struct SerializeTupleStruct<E> { + name: &'static str, + fields: Vec<Content>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeTupleStruct for SerializeTupleStruct<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), E> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.fields.push(value); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::TupleStruct(self.name, self.fields)) + } + } + + pub struct SerializeTupleVariant<E> { + name: &'static str, + variant_index: u32, + variant: &'static str, + fields: Vec<Content>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeTupleVariant for SerializeTupleVariant<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), E> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.fields.push(value); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::TupleVariant( + self.name, + self.variant_index, + self.variant, + self.fields, + )) + } + } + + pub struct SerializeMap<E> { + entries: Vec<(Content, Content)>, + key: Option<Content>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeMap for SerializeMap<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), E> + where + T: Serialize, + { + let key = try!(key.serialize(ContentSerializer::<E>::new())); + self.key = Some(key); + Ok(()) + } + + fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), E> + where + T: Serialize, + { + let key = self + .key + .take() + .expect("serialize_value called before serialize_key"); + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.entries.push((key, value)); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::Map(self.entries)) + } + + fn serialize_entry<K: ?Sized, V: ?Sized>(&mut self, key: &K, value: &V) -> Result<(), E> + where + K: Serialize, + V: Serialize, + { + let key = try!(key.serialize(ContentSerializer::<E>::new())); + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.entries.push((key, value)); + Ok(()) + } + } + + pub struct SerializeStruct<E> { + name: &'static str, + fields: Vec<(&'static str, Content)>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeStruct for SerializeStruct<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), E> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.fields.push((key, value)); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::Struct(self.name, self.fields)) + } + } + + pub struct SerializeStructVariant<E> { + name: &'static str, + variant_index: u32, + variant: &'static str, + fields: Vec<(&'static str, Content)>, + error: PhantomData<E>, + } + + impl<E> ser::SerializeStructVariant for SerializeStructVariant<E> + where + E: ser::Error, + { + type Ok = Content; + type Error = E; + + fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), E> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<E>::new())); + self.fields.push((key, value)); + Ok(()) + } + + fn end(self) -> Result<Content, E> { + Ok(Content::StructVariant( + self.name, + self.variant_index, + self.variant, + self.fields, + )) + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatMapSerializer<'a, M: 'a>(pub &'a mut M); + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, M> FlatMapSerializer<'a, M> +where + M: SerializeMap + 'a, +{ + fn bad_type(what: Unsupported) -> M::Error { + ser::Error::custom(format_args!( + "can only flatten structs and maps (got {})", + what + )) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, M> Serializer for FlatMapSerializer<'a, M> +where + M: SerializeMap + 'a, +{ + type Ok = (); + type Error = M::Error; + + type SerializeSeq = Impossible<Self::Ok, M::Error>; + type SerializeTuple = Impossible<Self::Ok, M::Error>; + type SerializeTupleStruct = Impossible<Self::Ok, M::Error>; + type SerializeMap = FlatMapSerializeMap<'a, M>; + type SerializeStruct = FlatMapSerializeStruct<'a, M>; + type SerializeTupleVariant = Impossible<Self::Ok, M::Error>; + type SerializeStructVariant = FlatMapSerializeStructVariantAsMapValue<'a, M>; + + fn serialize_bool(self, _: bool) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Boolean)) + } + + fn serialize_i8(self, _: i8) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_i16(self, _: i16) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_i32(self, _: i32) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_i64(self, _: i64) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_u8(self, _: u8) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_u16(self, _: u16) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_u32(self, _: u32) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_u64(self, _: u64) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Integer)) + } + + fn serialize_f32(self, _: f32) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Float)) + } + + fn serialize_f64(self, _: f64) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Float)) + } + + fn serialize_char(self, _: char) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Char)) + } + + fn serialize_str(self, _: &str) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::String)) + } + + fn serialize_bytes(self, _: &[u8]) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::ByteArray)) + } + + fn serialize_none(self) -> Result<Self::Ok, Self::Error> { + Ok(()) + } + + fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error> + where + T: Serialize, + { + value.serialize(self) + } + + fn serialize_unit(self) -> Result<Self::Ok, Self::Error> { + Ok(()) + } + + fn serialize_unit_struct(self, _: &'static str) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::UnitStruct)) + } + + fn serialize_unit_variant( + self, + _: &'static str, + _: u32, + _: &'static str, + ) -> Result<Self::Ok, Self::Error> { + Err(Self::bad_type(Unsupported::Enum)) + } + + fn serialize_newtype_struct<T: ?Sized>( + self, + _: &'static str, + value: &T, + ) -> Result<Self::Ok, Self::Error> + where + T: Serialize, + { + value.serialize(self) + } + + fn serialize_newtype_variant<T: ?Sized>( + self, + _: &'static str, + _: u32, + variant: &'static str, + value: &T, + ) -> Result<Self::Ok, Self::Error> + where + T: Serialize, + { + try!(self.0.serialize_key(variant)); + self.0.serialize_value(value) + } + + fn serialize_seq(self, _: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> { + Err(Self::bad_type(Unsupported::Sequence)) + } + + fn serialize_tuple(self, _: usize) -> Result<Self::SerializeTuple, Self::Error> { + Err(Self::bad_type(Unsupported::Tuple)) + } + + fn serialize_tuple_struct( + self, + _: &'static str, + _: usize, + ) -> Result<Self::SerializeTupleStruct, Self::Error> { + Err(Self::bad_type(Unsupported::TupleStruct)) + } + + fn serialize_tuple_variant( + self, + _: &'static str, + _: u32, + _: &'static str, + _: usize, + ) -> Result<Self::SerializeTupleVariant, Self::Error> { + Err(Self::bad_type(Unsupported::Enum)) + } + + fn serialize_map(self, _: Option<usize>) -> Result<Self::SerializeMap, Self::Error> { + Ok(FlatMapSerializeMap(self.0)) + } + + fn serialize_struct( + self, + _: &'static str, + _: usize, + ) -> Result<Self::SerializeStruct, Self::Error> { + Ok(FlatMapSerializeStruct(self.0)) + } + + fn serialize_struct_variant( + self, + _: &'static str, + _: u32, + inner_variant: &'static str, + _: usize, + ) -> Result<Self::SerializeStructVariant, Self::Error> { + try!(self.0.serialize_key(inner_variant)); + Ok(FlatMapSerializeStructVariantAsMapValue::new( + self.0, + inner_variant, + )) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatMapSerializeMap<'a, M: 'a>(&'a mut M); + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, M> ser::SerializeMap for FlatMapSerializeMap<'a, M> +where + M: SerializeMap + 'a, +{ + type Ok = (); + type Error = M::Error; + + fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error> + where + T: Serialize, + { + self.0.serialize_key(key) + } + + fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> + where + T: Serialize, + { + self.0.serialize_value(value) + } + + fn serialize_entry<K: ?Sized, V: ?Sized>( + &mut self, + key: &K, + value: &V, + ) -> Result<(), Self::Error> + where + K: Serialize, + V: Serialize, + { + self.0.serialize_entry(key, value) + } + + fn end(self) -> Result<(), Self::Error> { + Ok(()) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatMapSerializeStruct<'a, M: 'a>(&'a mut M); + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, M> ser::SerializeStruct for FlatMapSerializeStruct<'a, M> +where + M: SerializeMap + 'a, +{ + type Ok = (); + type Error = M::Error; + + fn serialize_field<T: ?Sized>( + &mut self, + key: &'static str, + value: &T, + ) -> Result<(), Self::Error> + where + T: Serialize, + { + self.0.serialize_entry(key, value) + } + + fn end(self) -> Result<(), Self::Error> { + Ok(()) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +pub struct FlatMapSerializeStructVariantAsMapValue<'a, M: 'a> { + map: &'a mut M, + name: &'static str, + fields: Vec<(&'static str, Content)>, +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, M> FlatMapSerializeStructVariantAsMapValue<'a, M> +where + M: SerializeMap + 'a, +{ + fn new(map: &'a mut M, name: &'static str) -> FlatMapSerializeStructVariantAsMapValue<'a, M> { + FlatMapSerializeStructVariantAsMapValue { + map: map, + name: name, + fields: Vec::new(), + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl<'a, M> ser::SerializeStructVariant for FlatMapSerializeStructVariantAsMapValue<'a, M> +where + M: SerializeMap + 'a, +{ + type Ok = (); + type Error = M::Error; + + fn serialize_field<T: ?Sized>( + &mut self, + key: &'static str, + value: &T, + ) -> Result<(), Self::Error> + where + T: Serialize, + { + let value = try!(value.serialize(ContentSerializer::<M::Error>::new())); + self.fields.push((key, value)); + Ok(()) + } + + fn end(self) -> Result<(), Self::Error> { + try!(self + .map + .serialize_value(&Content::Struct(self.name, self.fields))); + Ok(()) + } +} diff --git a/vendor/serde/src/private/size_hint.rs b/vendor/serde/src/private/size_hint.rs new file mode 100644 index 000000000..ca71e616b --- /dev/null +++ b/vendor/serde/src/private/size_hint.rs @@ -0,0 +1,21 @@ +use lib::*; + +pub fn from_bounds<I>(iter: &I) -> Option<usize> +where + I: Iterator, +{ + helper(iter.size_hint()) +} + +#[cfg(any(feature = "std", feature = "alloc"))] +#[inline] +pub fn cautious(hint: Option<usize>) -> usize { + cmp::min(hint.unwrap_or(0), 4096) +} + +fn helper(bounds: (usize, Option<usize>)) -> Option<usize> { + match bounds { + (lower, Some(upper)) if lower == upper => Some(upper), + _ => None, + } +} diff --git a/vendor/serde/src/ser/fmt.rs b/vendor/serde/src/ser/fmt.rs new file mode 100644 index 000000000..e7e09a1bf --- /dev/null +++ b/vendor/serde/src/ser/fmt.rs @@ -0,0 +1,174 @@ +use lib::*; +use ser::{Error, Impossible, Serialize, Serializer}; + +impl Error for fmt::Error { + fn custom<T: Display>(_msg: T) -> Self { + fmt::Error + } +} + +macro_rules! fmt_primitives { + ($($f:ident: $t:ty,)*) => { + $( + fn $f(self, v: $t) -> fmt::Result { + Display::fmt(&v, self) + } + )* + }; +} + +/// ```edition2018 +/// use serde::Serialize; +/// use std::fmt::{self, Display}; +/// +/// #[derive(Serialize)] +/// #[serde(rename_all = "kebab-case")] +/// pub enum MessageType { +/// StartRequest, +/// EndRequest, +/// } +/// +/// impl Display for MessageType { +/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { +/// self.serialize(f) +/// } +/// } +/// ``` +impl<'a, 'b> Serializer for &'a mut fmt::Formatter<'b> { + type Ok = (); + type Error = fmt::Error; + type SerializeSeq = Impossible<(), fmt::Error>; + type SerializeTuple = Impossible<(), fmt::Error>; + type SerializeTupleStruct = Impossible<(), fmt::Error>; + type SerializeTupleVariant = Impossible<(), fmt::Error>; + type SerializeMap = Impossible<(), fmt::Error>; + type SerializeStruct = Impossible<(), fmt::Error>; + type SerializeStructVariant = Impossible<(), fmt::Error>; + + fmt_primitives! { + serialize_bool: bool, + serialize_i8: i8, + serialize_i16: i16, + serialize_i32: i32, + serialize_i64: i64, + serialize_u8: u8, + serialize_u16: u16, + serialize_u32: u32, + serialize_u64: u64, + serialize_f32: f32, + serialize_f64: f64, + serialize_char: char, + serialize_str: &str, + serialize_unit_struct: &'static str, + } + + serde_if_integer128! { + fmt_primitives! { + serialize_i128: i128, + serialize_u128: u128, + } + } + + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + ) -> fmt::Result { + Display::fmt(variant, self) + } + + fn serialize_newtype_struct<T: ?Sized>(self, _name: &'static str, value: &T) -> fmt::Result + where + T: Serialize, + { + Serialize::serialize(value, self) + } + + fn serialize_bytes(self, _v: &[u8]) -> fmt::Result { + Err(fmt::Error) + } + + fn serialize_none(self) -> fmt::Result { + Err(fmt::Error) + } + + fn serialize_some<T: ?Sized>(self, _value: &T) -> fmt::Result + where + T: Serialize, + { + Err(fmt::Error) + } + + fn serialize_unit(self) -> fmt::Result { + Err(fmt::Error) + } + + fn serialize_newtype_variant<T: ?Sized>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> fmt::Result + where + T: Serialize, + { + Err(fmt::Error) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, fmt::Error> { + Err(fmt::Error) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, fmt::Error> { + Err(fmt::Error) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct, fmt::Error> { + Err(fmt::Error) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant, fmt::Error> { + Err(fmt::Error) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, fmt::Error> { + Err(fmt::Error) + } + + fn serialize_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeStruct, fmt::Error> { + Err(fmt::Error) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant, fmt::Error> { + Err(fmt::Error) + } + + fn collect_str<T: ?Sized>(self, value: &T) -> fmt::Result + where + T: Display, + { + Display::fmt(value, self) + } +} diff --git a/vendor/serde/src/ser/impls.rs b/vendor/serde/src/ser/impls.rs new file mode 100644 index 000000000..7219f51b7 --- /dev/null +++ b/vendor/serde/src/ser/impls.rs @@ -0,0 +1,936 @@ +use lib::*; + +use ser::{Error, Serialize, SerializeTuple, Serializer}; + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! primitive_impl { + ($ty:ident, $method:ident $($cast:tt)*) => { + impl Serialize for $ty { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.$method(*self $($cast)*) + } + } + } +} + +primitive_impl!(bool, serialize_bool); +primitive_impl!(isize, serialize_i64 as i64); +primitive_impl!(i8, serialize_i8); +primitive_impl!(i16, serialize_i16); +primitive_impl!(i32, serialize_i32); +primitive_impl!(i64, serialize_i64); +primitive_impl!(usize, serialize_u64 as u64); +primitive_impl!(u8, serialize_u8); +primitive_impl!(u16, serialize_u16); +primitive_impl!(u32, serialize_u32); +primitive_impl!(u64, serialize_u64); +primitive_impl!(f32, serialize_f32); +primitive_impl!(f64, serialize_f64); +primitive_impl!(char, serialize_char); + +serde_if_integer128! { + primitive_impl!(i128, serialize_i128); + primitive_impl!(u128, serialize_u128); +} + +//////////////////////////////////////////////////////////////////////////////// + +impl Serialize for str { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_str(self) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl Serialize for String { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_str(self) + } +} + +impl<'a> Serialize for fmt::Arguments<'a> { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.collect_str(self) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +impl Serialize for CStr { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_bytes(self.to_bytes()) + } +} + +#[cfg(feature = "std")] +impl Serialize for CString { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_bytes(self.to_bytes()) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<T> Serialize for Option<T> +where + T: Serialize, +{ + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match *self { + Some(ref value) => serializer.serialize_some(value), + None => serializer.serialize_none(), + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<T: ?Sized> Serialize for PhantomData<T> { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_unit_struct("PhantomData") + } +} + +//////////////////////////////////////////////////////////////////////////////// + +// Does not require T: Serialize. +impl<T> Serialize for [T; 0] { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + try!(serializer.serialize_tuple(0)).end() + } +} + +macro_rules! array_impls { + ($($len:tt)+) => { + $( + impl<T> Serialize for [T; $len] + where + T: Serialize, + { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + let mut seq = try!(serializer.serialize_tuple($len)); + for e in self { + try!(seq.serialize_element(e)); + } + seq.end() + } + } + )+ + } +} + +array_impls! { + 01 02 03 04 05 06 07 08 09 10 + 11 12 13 14 15 16 17 18 19 20 + 21 22 23 24 25 26 27 28 29 30 + 31 32 +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<T> Serialize for [T] +where + T: Serialize, +{ + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.collect_seq(self) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +macro_rules! seq_impl { + ($ty:ident < T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound:ident)* >) => { + impl<T $(, $typaram)*> Serialize for $ty<T $(, $typaram)*> + where + T: Serialize $(+ $tbound1 $(+ $tbound2)*)*, + $($typaram: $bound,)* + { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.collect_seq(self) + } + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!(BinaryHeap<T: Ord>); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!(BTreeSet<T: Ord>); + +#[cfg(feature = "std")] +seq_impl!(HashSet<T: Eq + Hash, H: BuildHasher>); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!(LinkedList<T>); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!(Vec<T>); + +#[cfg(any(feature = "std", feature = "alloc"))] +seq_impl!(VecDeque<T>); + +//////////////////////////////////////////////////////////////////////////////// + +impl<Idx> Serialize for Range<Idx> +where + Idx: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use super::SerializeStruct; + let mut state = try!(serializer.serialize_struct("Range", 2)); + try!(state.serialize_field("start", &self.start)); + try!(state.serialize_field("end", &self.end)); + state.end() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(not(no_range_inclusive))] +impl<Idx> Serialize for RangeInclusive<Idx> +where + Idx: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use super::SerializeStruct; + let mut state = try!(serializer.serialize_struct("RangeInclusive", 2)); + try!(state.serialize_field("start", &self.start())); + try!(state.serialize_field("end", &self.end())); + state.end() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(not(no_ops_bound), all(feature = "std", not(no_collections_bound))))] +impl<T> Serialize for Bound<T> +where + T: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match *self { + Bound::Unbounded => serializer.serialize_unit_variant("Bound", 0, "Unbounded"), + Bound::Included(ref value) => { + serializer.serialize_newtype_variant("Bound", 1, "Included", value) + } + Bound::Excluded(ref value) => { + serializer.serialize_newtype_variant("Bound", 2, "Excluded", value) + } + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl Serialize for () { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_unit() + } +} + +#[cfg(feature = "unstable")] +impl Serialize for ! { + fn serialize<S>(&self, _serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + *self + } +} + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! tuple_impls { + ($($len:expr => ($($n:tt $name:ident)+))+) => { + $( + impl<$($name),+> Serialize for ($($name,)+) + where + $($name: Serialize,)+ + { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + let mut tuple = try!(serializer.serialize_tuple($len)); + $( + try!(tuple.serialize_element(&self.$n)); + )+ + tuple.end() + } + } + )+ + } +} + +tuple_impls! { + 1 => (0 T0) + 2 => (0 T0 1 T1) + 3 => (0 T0 1 T1 2 T2) + 4 => (0 T0 1 T1 2 T2 3 T3) + 5 => (0 T0 1 T1 2 T2 3 T3 4 T4) + 6 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5) + 7 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6) + 8 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7) + 9 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8) + 10 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9) + 11 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10) + 12 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11) + 13 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12) + 14 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13) + 15 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14) + 16 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14 15 T15) +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", feature = "alloc"))] +macro_rules! map_impl { + ($ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound:ident)* >) => { + impl<K, V $(, $typaram)*> Serialize for $ty<K, V $(, $typaram)*> + where + K: Serialize $(+ $kbound1 $(+ $kbound2)*)*, + V: Serialize, + $($typaram: $bound,)* + { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.collect_map(self) + } + } + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +map_impl!(BTreeMap<K: Ord, V>); + +#[cfg(feature = "std")] +map_impl!(HashMap<K: Eq + Hash, V, H: BuildHasher>); + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! deref_impl { + ( + $(#[doc = $doc:tt])* + <$($desc:tt)+ + ) => { + $(#[doc = $doc])* + impl <$($desc)+ { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + (**self).serialize(serializer) + } + } + }; +} + +deref_impl!(<'a, T: ?Sized> Serialize for &'a T where T: Serialize); +deref_impl!(<'a, T: ?Sized> Serialize for &'a mut T where T: Serialize); + +#[cfg(any(feature = "std", feature = "alloc"))] +deref_impl!(<T: ?Sized> Serialize for Box<T> where T: Serialize); + +#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] +deref_impl! { + /// This impl requires the [`"rc"`] Cargo feature of Serde. + /// + /// Serializing a data structure containing `Rc` will serialize a copy of + /// the contents of the `Rc` each time the `Rc` is referenced within the + /// data structure. Serialization will not attempt to deduplicate these + /// repeated data. + /// + /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc + <T: ?Sized> Serialize for Rc<T> where T: Serialize +} + +#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] +deref_impl! { + /// This impl requires the [`"rc"`] Cargo feature of Serde. + /// + /// Serializing a data structure containing `Arc` will serialize a copy of + /// the contents of the `Arc` each time the `Arc` is referenced within the + /// data structure. Serialization will not attempt to deduplicate these + /// repeated data. + /// + /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc + <T: ?Sized> Serialize for Arc<T> where T: Serialize +} + +#[cfg(any(feature = "std", feature = "alloc"))] +deref_impl!(<'a, T: ?Sized> Serialize for Cow<'a, T> where T: Serialize + ToOwned); + +//////////////////////////////////////////////////////////////////////////////// + +/// This impl requires the [`"rc"`] Cargo feature of Serde. +/// +/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc +#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] +impl<T: ?Sized> Serialize for RcWeak<T> +where + T: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.upgrade().serialize(serializer) + } +} + +/// This impl requires the [`"rc"`] Cargo feature of Serde. +/// +/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc +#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] +impl<T: ?Sized> Serialize for ArcWeak<T> +where + T: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.upgrade().serialize(serializer) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! nonzero_integers { + ( $( $T: ident, )+ ) => { + $( + #[cfg(not(no_num_nonzero))] + impl Serialize for num::$T { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.get().serialize(serializer) + } + } + )+ + } +} + +nonzero_integers! { + NonZeroU8, + NonZeroU16, + NonZeroU32, + NonZeroU64, + NonZeroUsize, +} + +#[cfg(not(no_num_nonzero_signed))] +nonzero_integers! { + NonZeroI8, + NonZeroI16, + NonZeroI32, + NonZeroI64, + NonZeroIsize, +} + +// Currently 128-bit integers do not work on Emscripten targets so we need an +// additional `#[cfg]` +serde_if_integer128! { + nonzero_integers! { + NonZeroU128, + } + + #[cfg(not(no_num_nonzero_signed))] + nonzero_integers! { + NonZeroI128, + } +} + +impl<T> Serialize for Cell<T> +where + T: Serialize + Copy, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.get().serialize(serializer) + } +} + +impl<T> Serialize for RefCell<T> +where + T: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match self.try_borrow() { + Ok(value) => value.serialize(serializer), + Err(_) => Err(S::Error::custom("already mutably borrowed")), + } + } +} + +#[cfg(feature = "std")] +impl<T> Serialize for Mutex<T> +where + T: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match self.lock() { + Ok(locked) => locked.serialize(serializer), + Err(_) => Err(S::Error::custom("lock poison error while serializing")), + } + } +} + +#[cfg(feature = "std")] +impl<T> Serialize for RwLock<T> +where + T: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match self.read() { + Ok(locked) => locked.serialize(serializer), + Err(_) => Err(S::Error::custom("lock poison error while serializing")), + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<T, E> Serialize for Result<T, E> +where + T: Serialize, + E: Serialize, +{ + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match *self { + Result::Ok(ref value) => serializer.serialize_newtype_variant("Result", 0, "Ok", value), + Result::Err(ref value) => { + serializer.serialize_newtype_variant("Result", 1, "Err", value) + } + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(any(feature = "std", not(no_core_duration)))] +impl Serialize for Duration { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use super::SerializeStruct; + let mut state = try!(serializer.serialize_struct("Duration", 2)); + try!(state.serialize_field("secs", &self.as_secs())); + try!(state.serialize_field("nanos", &self.subsec_nanos())); + state.end() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +impl Serialize for SystemTime { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use super::SerializeStruct; + let duration_since_epoch = self + .duration_since(UNIX_EPOCH) + .map_err(|_| S::Error::custom("SystemTime must be later than UNIX_EPOCH"))?; + let mut state = try!(serializer.serialize_struct("SystemTime", 2)); + try!(state.serialize_field("secs_since_epoch", &duration_since_epoch.as_secs())); + try!(state.serialize_field("nanos_since_epoch", &duration_since_epoch.subsec_nanos())); + state.end() + } +} + +//////////////////////////////////////////////////////////////////////////////// + +/// Serialize a value that implements `Display` as a string, when that string is +/// statically known to never have more than a constant `MAX_LEN` bytes. +/// +/// Panics if the `Display` impl tries to write more than `MAX_LEN` bytes. +#[cfg(feature = "std")] +macro_rules! serialize_display_bounded_length { + ($value:expr, $max:expr, $serializer:expr) => {{ + let mut buffer = [0u8; $max]; + let remaining_len = { + let mut remaining = &mut buffer[..]; + write!(remaining, "{}", $value).unwrap(); + remaining.len() + }; + let written_len = buffer.len() - remaining_len; + let written = &buffer[..written_len]; + + // write! only provides fmt::Formatter to Display implementations, which + // has methods write_str and write_char but no method to write arbitrary + // bytes. Therefore `written` must be valid UTF-8. + let written_str = str::from_utf8(written).expect("must be valid UTF-8"); + $serializer.serialize_str(written_str) + }}; +} + +#[cfg(feature = "std")] +impl Serialize for net::IpAddr { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + if serializer.is_human_readable() { + match *self { + net::IpAddr::V4(ref a) => a.serialize(serializer), + net::IpAddr::V6(ref a) => a.serialize(serializer), + } + } else { + match *self { + net::IpAddr::V4(ref a) => { + serializer.serialize_newtype_variant("IpAddr", 0, "V4", a) + } + net::IpAddr::V6(ref a) => { + serializer.serialize_newtype_variant("IpAddr", 1, "V6", a) + } + } + } + } +} + +#[cfg(feature = "std")] +const DEC_DIGITS_LUT: &'static [u8] = b"\ + 0001020304050607080910111213141516171819\ + 2021222324252627282930313233343536373839\ + 4041424344454647484950515253545556575859\ + 6061626364656667686970717273747576777879\ + 8081828384858687888990919293949596979899"; + +#[cfg(feature = "std")] +#[inline] +fn format_u8(mut n: u8, out: &mut [u8]) -> usize { + if n >= 100 { + let d1 = ((n % 100) << 1) as usize; + n /= 100; + out[0] = b'0' + n; + out[1] = DEC_DIGITS_LUT[d1]; + out[2] = DEC_DIGITS_LUT[d1 + 1]; + 3 + } else if n >= 10 { + let d1 = (n << 1) as usize; + out[0] = DEC_DIGITS_LUT[d1]; + out[1] = DEC_DIGITS_LUT[d1 + 1]; + 2 + } else { + out[0] = b'0' + n; + 1 + } +} + +#[cfg(feature = "std")] +#[test] +fn test_format_u8() { + let mut i = 0u8; + + loop { + let mut buf = [0u8; 3]; + let written = format_u8(i, &mut buf); + assert_eq!(i.to_string().as_bytes(), &buf[..written]); + + match i.checked_add(1) { + Some(next) => i = next, + None => break, + } + } +} + +#[cfg(feature = "std")] +impl Serialize for net::Ipv4Addr { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + if serializer.is_human_readable() { + const MAX_LEN: usize = 15; + debug_assert_eq!(MAX_LEN, "101.102.103.104".len()); + let mut buf = [b'.'; MAX_LEN]; + let mut written = format_u8(self.octets()[0], &mut buf); + for oct in &self.octets()[1..] { + // Skip over delimiters that we initialized buf with + written += format_u8(*oct, &mut buf[written + 1..]) + 1; + } + // We've only written ASCII bytes to the buffer, so it is valid UTF-8 + serializer.serialize_str(unsafe { str::from_utf8_unchecked(&buf[..written]) }) + } else { + self.octets().serialize(serializer) + } + } +} + +#[cfg(feature = "std")] +impl Serialize for net::Ipv6Addr { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + if serializer.is_human_readable() { + const MAX_LEN: usize = 39; + debug_assert_eq!(MAX_LEN, "1001:1002:1003:1004:1005:1006:1007:1008".len()); + serialize_display_bounded_length!(self, MAX_LEN, serializer) + } else { + self.octets().serialize(serializer) + } + } +} + +#[cfg(feature = "std")] +impl Serialize for net::SocketAddr { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + if serializer.is_human_readable() { + match *self { + net::SocketAddr::V4(ref addr) => addr.serialize(serializer), + net::SocketAddr::V6(ref addr) => addr.serialize(serializer), + } + } else { + match *self { + net::SocketAddr::V4(ref addr) => { + serializer.serialize_newtype_variant("SocketAddr", 0, "V4", addr) + } + net::SocketAddr::V6(ref addr) => { + serializer.serialize_newtype_variant("SocketAddr", 1, "V6", addr) + } + } + } + } +} + +#[cfg(feature = "std")] +impl Serialize for net::SocketAddrV4 { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + if serializer.is_human_readable() { + const MAX_LEN: usize = 21; + debug_assert_eq!(MAX_LEN, "101.102.103.104:65000".len()); + serialize_display_bounded_length!(self, MAX_LEN, serializer) + } else { + (self.ip(), self.port()).serialize(serializer) + } + } +} + +#[cfg(feature = "std")] +impl Serialize for net::SocketAddrV6 { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + if serializer.is_human_readable() { + const MAX_LEN: usize = 58; + debug_assert_eq!( + MAX_LEN, + "[1001:1002:1003:1004:1005:1006:1007:1008%4294967295]:65000".len() + ); + serialize_display_bounded_length!(self, MAX_LEN, serializer) + } else { + (self.ip(), self.port()).serialize(serializer) + } + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +impl Serialize for Path { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match self.to_str() { + Some(s) => s.serialize(serializer), + None => Err(Error::custom("path contains invalid UTF-8 characters")), + } + } +} + +#[cfg(feature = "std")] +impl Serialize for PathBuf { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.as_path().serialize(serializer) + } +} + +#[cfg(all(feature = "std", any(unix, windows)))] +impl Serialize for OsStr { + #[cfg(unix)] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use std::os::unix::ffi::OsStrExt; + serializer.serialize_newtype_variant("OsString", 0, "Unix", self.as_bytes()) + } + + #[cfg(windows)] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use std::os::windows::ffi::OsStrExt; + let val = self.encode_wide().collect::<Vec<_>>(); + serializer.serialize_newtype_variant("OsString", 1, "Windows", &val) + } +} + +#[cfg(all(feature = "std", any(unix, windows)))] +impl Serialize for OsString { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.as_os_str().serialize(serializer) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +impl<T> Serialize for Wrapping<T> +where + T: Serialize, +{ + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.0.serialize(serializer) + } +} + +#[cfg(not(no_core_reverse))] +impl<T> Serialize for Reverse<T> +where + T: Serialize, +{ + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + self.0.serialize(serializer) + } +} + +//////////////////////////////////////////////////////////////////////////////// + +#[cfg(all(feature = "std", not(no_std_atomic)))] +macro_rules! atomic_impl { + ($($ty:ident)*) => { + $( + impl Serialize for $ty { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + // Matches the atomic ordering used in libcore for the Debug impl + self.load(Ordering::SeqCst).serialize(serializer) + } + } + )* + } +} + +#[cfg(all(feature = "std", not(no_std_atomic)))] +atomic_impl! { + AtomicBool + AtomicI8 AtomicI16 AtomicI32 AtomicIsize + AtomicU8 AtomicU16 AtomicU32 AtomicUsize +} + +#[cfg(all(feature = "std", not(no_std_atomic64)))] +atomic_impl! { + AtomicI64 AtomicU64 +} diff --git a/vendor/serde/src/ser/impossible.rs b/vendor/serde/src/ser/impossible.rs new file mode 100644 index 000000000..e8df9ca7a --- /dev/null +++ b/vendor/serde/src/ser/impossible.rs @@ -0,0 +1,216 @@ +//! This module contains `Impossible` serializer and its implementations. + +use lib::*; + +use ser::{ + self, Serialize, SerializeMap, SerializeSeq, SerializeStruct, SerializeStructVariant, + SerializeTuple, SerializeTupleStruct, SerializeTupleVariant, +}; + +/// Helper type for implementing a `Serializer` that does not support +/// serializing one of the compound types. +/// +/// This type cannot be instantiated, but implements every one of the traits +/// corresponding to the [`Serializer`] compound types: [`SerializeSeq`], +/// [`SerializeTuple`], [`SerializeTupleStruct`], [`SerializeTupleVariant`], +/// [`SerializeMap`], [`SerializeStruct`], and [`SerializeStructVariant`]. +/// +/// ```edition2018 +/// # use serde::ser::{Serializer, Impossible}; +/// # use serde::__private::doc::Error; +/// # +/// # struct MySerializer; +/// # +/// impl Serializer for MySerializer { +/// type Ok = (); +/// type Error = Error; +/// +/// type SerializeSeq = Impossible<(), Error>; +/// /* other associated types */ +/// +/// /// This data format does not support serializing sequences. +/// fn serialize_seq(self, +/// len: Option<usize>) +/// -> Result<Self::SerializeSeq, Error> { +/// // Given Impossible cannot be instantiated, the only +/// // thing we can do here is to return an error. +/// # stringify! { +/// Err(...) +/// # }; +/// # unimplemented!() +/// } +/// +/// /* other Serializer methods */ +/// # serde::__serialize_unimplemented! { +/// # bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char str bytes none some +/// # unit unit_struct unit_variant newtype_struct newtype_variant +/// # tuple tuple_struct tuple_variant map struct struct_variant +/// # } +/// } +/// ``` +/// +/// [`Serializer`]: trait.Serializer.html +/// [`SerializeSeq`]: trait.SerializeSeq.html +/// [`SerializeTuple`]: trait.SerializeTuple.html +/// [`SerializeTupleStruct`]: trait.SerializeTupleStruct.html +/// [`SerializeTupleVariant`]: trait.SerializeTupleVariant.html +/// [`SerializeMap`]: trait.SerializeMap.html +/// [`SerializeStruct`]: trait.SerializeStruct.html +/// [`SerializeStructVariant`]: trait.SerializeStructVariant.html +pub struct Impossible<Ok, Error> { + void: Void, + ok: PhantomData<Ok>, + error: PhantomData<Error>, +} + +enum Void {} + +impl<Ok, Error> SerializeSeq for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} + +impl<Ok, Error> SerializeTuple for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} + +impl<Ok, Error> SerializeTupleStruct for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} + +impl<Ok, Error> SerializeTupleVariant for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} + +impl<Ok, Error> SerializeMap for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = key; + match self.void {} + } + + fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} + +impl<Ok, Error> SerializeStruct for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = key; + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} + +impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error> +where + Error: ser::Error, +{ + type Ok = Ok; + type Error = Error; + + fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), Error> + where + T: Serialize, + { + let _ = key; + let _ = value; + match self.void {} + } + + fn end(self) -> Result<Ok, Error> { + match self.void {} + } +} diff --git a/vendor/serde/src/ser/mod.rs b/vendor/serde/src/ser/mod.rs new file mode 100644 index 000000000..eb226ae96 --- /dev/null +++ b/vendor/serde/src/ser/mod.rs @@ -0,0 +1,1986 @@ +//! Generic data structure serialization framework. +//! +//! The two most important traits in this module are [`Serialize`] and +//! [`Serializer`]. +//! +//! - **A type that implements `Serialize` is a data structure** that can be +//! serialized to any data format supported by Serde, and conversely +//! - **A type that implements `Serializer` is a data format** that can +//! serialize any data structure supported by Serde. +//! +//! # The Serialize trait +//! +//! Serde provides [`Serialize`] implementations for many Rust primitive and +//! standard library types. The complete list is below. All of these can be +//! serialized using Serde out of the box. +//! +//! Additionally, Serde provides a procedural macro called [`serde_derive`] to +//! automatically generate [`Serialize`] implementations for structs and enums +//! in your program. See the [derive section of the manual] for how to use this. +//! +//! In rare cases it may be necessary to implement [`Serialize`] manually for +//! some type in your program. See the [Implementing `Serialize`] section of the +//! manual for more about this. +//! +//! Third-party crates may provide [`Serialize`] implementations for types that +//! they expose. For example the [`linked-hash-map`] crate provides a +//! [`LinkedHashMap<K, V>`] type that is serializable by Serde because the crate +//! provides an implementation of [`Serialize`] for it. +//! +//! # The Serializer trait +//! +//! [`Serializer`] implementations are provided by third-party crates, for +//! example [`serde_json`], [`serde_yaml`] and [`bincode`]. +//! +//! A partial list of well-maintained formats is given on the [Serde +//! website][data formats]. +//! +//! # Implementations of Serialize provided by Serde +//! +//! - **Primitive types**: +//! - bool +//! - i8, i16, i32, i64, i128, isize +//! - u8, u16, u32, u64, u128, usize +//! - f32, f64 +//! - char +//! - str +//! - &T and &mut T +//! - **Compound types**: +//! - \[T\] +//! - \[T; 0\] through \[T; 32\] +//! - tuples up to size 16 +//! - **Common standard library types**: +//! - String +//! - Option\<T\> +//! - Result\<T, E\> +//! - PhantomData\<T\> +//! - **Wrapper types**: +//! - Box\<T\> +//! - Cow\<'a, T\> +//! - Cell\<T\> +//! - RefCell\<T\> +//! - Mutex\<T\> +//! - RwLock\<T\> +//! - Rc\<T\> *(if* features = ["rc"] *is enabled)* +//! - Arc\<T\> *(if* features = ["rc"] *is enabled)* +//! - **Collection types**: +//! - BTreeMap\<K, V\> +//! - BTreeSet\<T\> +//! - BinaryHeap\<T\> +//! - HashMap\<K, V, H\> +//! - HashSet\<T, H\> +//! - LinkedList\<T\> +//! - VecDeque\<T\> +//! - Vec\<T\> +//! - **FFI types**: +//! - CStr +//! - CString +//! - OsStr +//! - OsString +//! - **Miscellaneous standard library types**: +//! - Duration +//! - SystemTime +//! - Path +//! - PathBuf +//! - Range\<T\> +//! - RangeInclusive\<T\> +//! - Bound\<T\> +//! - num::NonZero* +//! - `!` *(unstable)* +//! - **Net types**: +//! - IpAddr +//! - Ipv4Addr +//! - Ipv6Addr +//! - SocketAddr +//! - SocketAddrV4 +//! - SocketAddrV6 +//! +//! [Implementing `Serialize`]: https://serde.rs/impl-serialize.html +//! [`LinkedHashMap<K, V>`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html +//! [`Serialize`]: ../trait.Serialize.html +//! [`Serializer`]: ../trait.Serializer.html +//! [`bincode`]: https://github.com/bincode-org/bincode +//! [`linked-hash-map`]: https://crates.io/crates/linked-hash-map +//! [`serde_derive`]: https://crates.io/crates/serde_derive +//! [`serde_json`]: https://github.com/serde-rs/json +//! [`serde_yaml`]: https://github.com/dtolnay/serde-yaml +//! [derive section of the manual]: https://serde.rs/derive.html +//! [data formats]: https://serde.rs/#data-formats + +use lib::*; + +mod fmt; +mod impls; +mod impossible; + +pub use self::impossible::Impossible; + +#[cfg(feature = "std")] +#[doc(no_inline)] +pub use std::error::Error as StdError; +#[cfg(not(feature = "std"))] +#[doc(no_inline)] +pub use std_error::Error as StdError; + +//////////////////////////////////////////////////////////////////////////////// + +macro_rules! declare_error_trait { + (Error: Sized $(+ $($supertrait:ident)::+)*) => { + /// Trait used by `Serialize` implementations to generically construct + /// errors belonging to the `Serializer` against which they are + /// currently running. + /// + /// # Example implementation + /// + /// The [example data format] presented on the website shows an error + /// type appropriate for a basic JSON data format. + /// + /// [example data format]: https://serde.rs/data-format.html + pub trait Error: Sized $(+ $($supertrait)::+)* { + /// Used when a [`Serialize`] implementation encounters any error + /// while serializing a type. + /// + /// The message should not be capitalized and should not end with a + /// period. + /// + /// For example, a filesystem [`Path`] may refuse to serialize + /// itself if it contains invalid UTF-8 data. + /// + /// ```edition2018 + /// # struct Path; + /// # + /// # impl Path { + /// # fn to_str(&self) -> Option<&str> { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use serde::ser::{self, Serialize, Serializer}; + /// + /// impl Serialize for Path { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match self.to_str() { + /// Some(s) => serializer.serialize_str(s), + /// None => Err(ser::Error::custom("path contains invalid UTF-8 characters")), + /// } + /// } + /// } + /// ``` + /// + /// [`Path`]: https://doc.rust-lang.org/std/path/struct.Path.html + /// [`Serialize`]: ../trait.Serialize.html + fn custom<T>(msg: T) -> Self + where + T: Display; + } + } +} + +#[cfg(feature = "std")] +declare_error_trait!(Error: Sized + StdError); + +#[cfg(not(feature = "std"))] +declare_error_trait!(Error: Sized + Debug + Display); + +//////////////////////////////////////////////////////////////////////////////// + +/// A **data structure** that can be serialized into any data format supported +/// by Serde. +/// +/// Serde provides `Serialize` implementations for many Rust primitive and +/// standard library types. The complete list is [here][ser]. All of these can +/// be serialized using Serde out of the box. +/// +/// Additionally, Serde provides a procedural macro called [`serde_derive`] to +/// automatically generate `Serialize` implementations for structs and enums in +/// your program. See the [derive section of the manual] for how to use this. +/// +/// In rare cases it may be necessary to implement `Serialize` manually for some +/// type in your program. See the [Implementing `Serialize`] section of the +/// manual for more about this. +/// +/// Third-party crates may provide `Serialize` implementations for types that +/// they expose. For example the [`linked-hash-map`] crate provides a +/// [`LinkedHashMap<K, V>`] type that is serializable by Serde because the crate +/// provides an implementation of `Serialize` for it. +/// +/// [Implementing `Serialize`]: https://serde.rs/impl-serialize.html +/// [`LinkedHashMap<K, V>`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html +/// [`linked-hash-map`]: https://crates.io/crates/linked-hash-map +/// [`serde_derive`]: https://crates.io/crates/serde_derive +/// [derive section of the manual]: https://serde.rs/derive.html +/// [ser]: https://docs.serde.rs/serde/ser/index.html +pub trait Serialize { + /// Serialize this value into the given Serde serializer. + /// + /// See the [Implementing `Serialize`] section of the manual for more + /// information about how to implement this method. + /// + /// ```edition2018 + /// use serde::ser::{Serialize, SerializeStruct, Serializer}; + /// + /// struct Person { + /// name: String, + /// age: u8, + /// phones: Vec<String>, + /// } + /// + /// // This is what #[derive(Serialize)] would generate. + /// impl Serialize for Person { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut s = serializer.serialize_struct("Person", 3)?; + /// s.serialize_field("name", &self.name)?; + /// s.serialize_field("age", &self.age)?; + /// s.serialize_field("phones", &self.phones)?; + /// s.end() + /// } + /// } + /// ``` + /// + /// [Implementing `Serialize`]: https://serde.rs/impl-serialize.html + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer; +} + +//////////////////////////////////////////////////////////////////////////////// + +/// A **data format** that can serialize any data structure supported by Serde. +/// +/// The role of this trait is to define the serialization half of the [Serde +/// data model], which is a way to categorize every Rust data structure into one +/// of 29 possible types. Each method of the `Serializer` trait corresponds to +/// one of the types of the data model. +/// +/// Implementations of `Serialize` map themselves into this data model by +/// invoking exactly one of the `Serializer` methods. +/// +/// The types that make up the Serde data model are: +/// +/// - **14 primitive types** +/// - bool +/// - i8, i16, i32, i64, i128 +/// - u8, u16, u32, u64, u128 +/// - f32, f64 +/// - char +/// - **string** +/// - UTF-8 bytes with a length and no null terminator. +/// - When serializing, all strings are handled equally. When deserializing, +/// there are three flavors of strings: transient, owned, and borrowed. +/// - **byte array** - \[u8\] +/// - Similar to strings, during deserialization byte arrays can be +/// transient, owned, or borrowed. +/// - **option** +/// - Either none or some value. +/// - **unit** +/// - The type of `()` in Rust. It represents an anonymous value containing +/// no data. +/// - **unit_struct** +/// - For example `struct Unit` or `PhantomData<T>`. It represents a named +/// value containing no data. +/// - **unit_variant** +/// - For example the `E::A` and `E::B` in `enum E { A, B }`. +/// - **newtype_struct** +/// - For example `struct Millimeters(u8)`. +/// - **newtype_variant** +/// - For example the `E::N` in `enum E { N(u8) }`. +/// - **seq** +/// - A variably sized heterogeneous sequence of values, for example +/// `Vec<T>` or `HashSet<T>`. When serializing, the length may or may not +/// be known before iterating through all the data. When deserializing, +/// the length is determined by looking at the serialized data. +/// - **tuple** +/// - A statically sized heterogeneous sequence of values for which the +/// length will be known at deserialization time without looking at the +/// serialized data, for example `(u8,)` or `(String, u64, Vec<T>)` or +/// `[u64; 10]`. +/// - **tuple_struct** +/// - A named tuple, for example `struct Rgb(u8, u8, u8)`. +/// - **tuple_variant** +/// - For example the `E::T` in `enum E { T(u8, u8) }`. +/// - **map** +/// - A heterogeneous key-value pairing, for example `BTreeMap<K, V>`. +/// - **struct** +/// - A heterogeneous key-value pairing in which the keys are strings and +/// will be known at deserialization time without looking at the +/// serialized data, for example `struct S { r: u8, g: u8, b: u8 }`. +/// - **struct_variant** +/// - For example the `E::S` in `enum E { S { r: u8, g: u8, b: u8 } }`. +/// +/// Many Serde serializers produce text or binary data as output, for example +/// JSON or Bincode. This is not a requirement of the `Serializer` trait, and +/// there are serializers that do not produce text or binary output. One example +/// is the `serde_json::value::Serializer` (distinct from the main `serde_json` +/// serializer) that produces a `serde_json::Value` data structure in memory as +/// output. +/// +/// [Serde data model]: https://serde.rs/data-model.html +/// +/// # Example implementation +/// +/// The [example data format] presented on the website contains example code for +/// a basic JSON `Serializer`. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait Serializer: Sized { + /// The output type produced by this `Serializer` during successful + /// serialization. Most serializers that produce text or binary output + /// should set `Ok = ()` and serialize into an [`io::Write`] or buffer + /// contained within the `Serializer` instance. Serializers that build + /// in-memory data structures may be simplified by using `Ok` to propagate + /// the data structure around. + /// + /// [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html + type Ok; + + /// The error type when some error occurs during serialization. + type Error: Error; + + /// Type returned from [`serialize_seq`] for serializing the content of the + /// sequence. + /// + /// [`serialize_seq`]: #tymethod.serialize_seq + type SerializeSeq: SerializeSeq<Ok = Self::Ok, Error = Self::Error>; + + /// Type returned from [`serialize_tuple`] for serializing the content of + /// the tuple. + /// + /// [`serialize_tuple`]: #tymethod.serialize_tuple + type SerializeTuple: SerializeTuple<Ok = Self::Ok, Error = Self::Error>; + + /// Type returned from [`serialize_tuple_struct`] for serializing the + /// content of the tuple struct. + /// + /// [`serialize_tuple_struct`]: #tymethod.serialize_tuple_struct + type SerializeTupleStruct: SerializeTupleStruct<Ok = Self::Ok, Error = Self::Error>; + + /// Type returned from [`serialize_tuple_variant`] for serializing the + /// content of the tuple variant. + /// + /// [`serialize_tuple_variant`]: #tymethod.serialize_tuple_variant + type SerializeTupleVariant: SerializeTupleVariant<Ok = Self::Ok, Error = Self::Error>; + + /// Type returned from [`serialize_map`] for serializing the content of the + /// map. + /// + /// [`serialize_map`]: #tymethod.serialize_map + type SerializeMap: SerializeMap<Ok = Self::Ok, Error = Self::Error>; + + /// Type returned from [`serialize_struct`] for serializing the content of + /// the struct. + /// + /// [`serialize_struct`]: #tymethod.serialize_struct + type SerializeStruct: SerializeStruct<Ok = Self::Ok, Error = Self::Error>; + + /// Type returned from [`serialize_struct_variant`] for serializing the + /// content of the struct variant. + /// + /// [`serialize_struct_variant`]: #tymethod.serialize_struct_variant + type SerializeStructVariant: SerializeStructVariant<Ok = Self::Ok, Error = Self::Error>; + + /// Serialize a `bool` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for bool { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_bool(*self) + /// } + /// } + /// ``` + fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error>; + + /// Serialize an `i8` value. + /// + /// If the format does not differentiate between `i8` and `i64`, a + /// reasonable implementation would be to cast the value to `i64` and + /// forward to `serialize_i64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for i8 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_i8(*self) + /// } + /// } + /// ``` + fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error>; + + /// Serialize an `i16` value. + /// + /// If the format does not differentiate between `i16` and `i64`, a + /// reasonable implementation would be to cast the value to `i64` and + /// forward to `serialize_i64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for i16 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_i16(*self) + /// } + /// } + /// ``` + fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error>; + + /// Serialize an `i32` value. + /// + /// If the format does not differentiate between `i32` and `i64`, a + /// reasonable implementation would be to cast the value to `i64` and + /// forward to `serialize_i64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for i32 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_i32(*self) + /// } + /// } + /// ``` + fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error>; + + /// Serialize an `i64` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for i64 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_i64(*self) + /// } + /// } + /// ``` + fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error>; + + serde_if_integer128! { + /// Serialize an `i128` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for i128 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_i128(*self) + /// } + /// } + /// ``` + /// + /// This method is available only on Rust compiler versions >=1.26. The + /// default behavior unconditionally returns an error. + fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> { + let _ = v; + Err(Error::custom("i128 is not supported")) + } + } + + /// Serialize a `u8` value. + /// + /// If the format does not differentiate between `u8` and `u64`, a + /// reasonable implementation would be to cast the value to `u64` and + /// forward to `serialize_u64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for u8 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_u8(*self) + /// } + /// } + /// ``` + fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error>; + + /// Serialize a `u16` value. + /// + /// If the format does not differentiate between `u16` and `u64`, a + /// reasonable implementation would be to cast the value to `u64` and + /// forward to `serialize_u64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for u16 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_u16(*self) + /// } + /// } + /// ``` + fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error>; + + /// Serialize a `u32` value. + /// + /// If the format does not differentiate between `u32` and `u64`, a + /// reasonable implementation would be to cast the value to `u64` and + /// forward to `serialize_u64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for u32 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_u32(*self) + /// } + /// } + /// ``` + fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error>; + + /// Serialize a `u64` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for u64 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_u64(*self) + /// } + /// } + /// ``` + fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error>; + + serde_if_integer128! { + /// Serialize a `u128` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for u128 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_u128(*self) + /// } + /// } + /// ``` + /// + /// This method is available only on Rust compiler versions >=1.26. The + /// default behavior unconditionally returns an error. + fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> { + let _ = v; + Err(Error::custom("u128 is not supported")) + } + } + + /// Serialize an `f32` value. + /// + /// If the format does not differentiate between `f32` and `f64`, a + /// reasonable implementation would be to cast the value to `f64` and + /// forward to `serialize_f64`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for f32 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_f32(*self) + /// } + /// } + /// ``` + fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error>; + + /// Serialize an `f64` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for f64 { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_f64(*self) + /// } + /// } + /// ``` + fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error>; + + /// Serialize a character. + /// + /// If the format does not support characters, it is reasonable to serialize + /// it as a single element `str` or a `u32`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for char { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_char(*self) + /// } + /// } + /// ``` + fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error>; + + /// Serialize a `&str`. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for str { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_str(self) + /// } + /// } + /// ``` + fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error>; + + /// Serialize a chunk of raw byte data. + /// + /// Enables serializers to serialize byte slices more compactly or more + /// efficiently than other types of slices. If no efficient implementation + /// is available, a reasonable implementation would be to forward to + /// `serialize_seq`. If forwarded, the implementation looks usually just + /// like this: + /// + /// ```edition2018 + /// # use serde::ser::{Serializer, SerializeSeq}; + /// # use serde::__private::doc::Error; + /// # + /// # struct MySerializer; + /// # + /// # impl Serializer for MySerializer { + /// # type Ok = (); + /// # type Error = Error; + /// # + /// fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> { + /// let mut seq = self.serialize_seq(Some(v.len()))?; + /// for b in v { + /// seq.serialize_element(b)?; + /// } + /// seq.end() + /// } + /// # + /// # serde::__serialize_unimplemented! { + /// # bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char str none some + /// # unit unit_struct unit_variant newtype_struct newtype_variant + /// # seq tuple tuple_struct tuple_variant map struct struct_variant + /// # } + /// # } + /// ``` + fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error>; + + /// Serialize a [`None`] value. + /// + /// ```edition2018 + /// # use serde::{Serialize, Serializer}; + /// # + /// # enum Option<T> { + /// # Some(T), + /// # None, + /// # } + /// # + /// # use self::Option::{Some, None}; + /// # + /// impl<T> Serialize for Option<T> + /// where + /// T: Serialize, + /// { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match *self { + /// Some(ref value) => serializer.serialize_some(value), + /// None => serializer.serialize_none(), + /// } + /// } + /// } + /// # + /// # fn main() {} + /// ``` + /// + /// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None + fn serialize_none(self) -> Result<Self::Ok, Self::Error>; + + /// Serialize a [`Some(T)`] value. + /// + /// ```edition2018 + /// # use serde::{Serialize, Serializer}; + /// # + /// # enum Option<T> { + /// # Some(T), + /// # None, + /// # } + /// # + /// # use self::Option::{Some, None}; + /// # + /// impl<T> Serialize for Option<T> + /// where + /// T: Serialize, + /// { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match *self { + /// Some(ref value) => serializer.serialize_some(value), + /// None => serializer.serialize_none(), + /// } + /// } + /// } + /// # + /// # fn main() {} + /// ``` + /// + /// [`Some(T)`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.Some + fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error> + where + T: Serialize; + + /// Serialize a `()` value. + /// + /// ```edition2018 + /// # use serde::Serializer; + /// # + /// # serde::__private_serialize!(); + /// # + /// impl Serialize for () { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_unit() + /// } + /// } + /// ``` + fn serialize_unit(self) -> Result<Self::Ok, Self::Error>; + + /// Serialize a unit struct like `struct Unit` or `PhantomData<T>`. + /// + /// A reasonable implementation would be to forward to `serialize_unit`. + /// + /// ```edition2018 + /// use serde::{Serialize, Serializer}; + /// + /// struct Nothing; + /// + /// impl Serialize for Nothing { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_unit_struct("Nothing") + /// } + /// } + /// ``` + fn serialize_unit_struct(self, name: &'static str) -> Result<Self::Ok, Self::Error>; + + /// Serialize a unit variant like `E::A` in `enum E { A, B }`. + /// + /// The `name` is the name of the enum, the `variant_index` is the index of + /// this variant within the enum, and the `variant` is the name of the + /// variant. + /// + /// ```edition2018 + /// use serde::{Serialize, Serializer}; + /// + /// enum E { + /// A, + /// B, + /// } + /// + /// impl Serialize for E { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match *self { + /// E::A => serializer.serialize_unit_variant("E", 0, "A"), + /// E::B => serializer.serialize_unit_variant("E", 1, "B"), + /// } + /// } + /// } + /// ``` + fn serialize_unit_variant( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + ) -> Result<Self::Ok, Self::Error>; + + /// Serialize a newtype struct like `struct Millimeters(u8)`. + /// + /// Serializers are encouraged to treat newtype structs as insignificant + /// wrappers around the data they contain. A reasonable implementation would + /// be to forward to `value.serialize(self)`. + /// + /// ```edition2018 + /// use serde::{Serialize, Serializer}; + /// + /// struct Millimeters(u8); + /// + /// impl Serialize for Millimeters { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.serialize_newtype_struct("Millimeters", &self.0) + /// } + /// } + /// ``` + fn serialize_newtype_struct<T: ?Sized>( + self, + name: &'static str, + value: &T, + ) -> Result<Self::Ok, Self::Error> + where + T: Serialize; + + /// Serialize a newtype variant like `E::N` in `enum E { N(u8) }`. + /// + /// The `name` is the name of the enum, the `variant_index` is the index of + /// this variant within the enum, and the `variant` is the name of the + /// variant. The `value` is the data contained within this newtype variant. + /// + /// ```edition2018 + /// use serde::{Serialize, Serializer}; + /// + /// enum E { + /// M(String), + /// N(u8), + /// } + /// + /// impl Serialize for E { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match *self { + /// E::M(ref s) => serializer.serialize_newtype_variant("E", 0, "M", s), + /// E::N(n) => serializer.serialize_newtype_variant("E", 1, "N", &n), + /// } + /// } + /// } + /// ``` + fn serialize_newtype_variant<T: ?Sized>( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + value: &T, + ) -> Result<Self::Ok, Self::Error> + where + T: Serialize; + + /// Begin to serialize a variably sized sequence. This call must be + /// followed by zero or more calls to `serialize_element`, then a call to + /// `end`. + /// + /// The argument is the number of elements in the sequence, which may or may + /// not be computable before the sequence is iterated. Some serializers only + /// support sequences whose length is known up front. + /// + /// ```edition2018 + /// # use std::marker::PhantomData; + /// # + /// # struct Vec<T>(PhantomData<T>); + /// # + /// # impl<T> Vec<T> { + /// # fn len(&self) -> usize { + /// # unimplemented!() + /// # } + /// # } + /// # + /// # impl<'a, T> IntoIterator for &'a Vec<T> { + /// # type Item = &'a T; + /// # type IntoIter = Box<Iterator<Item = &'a T>>; + /// # + /// # fn into_iter(self) -> Self::IntoIter { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use serde::ser::{Serialize, Serializer, SerializeSeq}; + /// + /// impl<T> Serialize for Vec<T> + /// where + /// T: Serialize, + /// { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut seq = serializer.serialize_seq(Some(self.len()))?; + /// for element in self { + /// seq.serialize_element(element)?; + /// } + /// seq.end() + /// } + /// } + /// ``` + fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error>; + + /// Begin to serialize a statically sized sequence whose length will be + /// known at deserialization time without looking at the serialized data. + /// This call must be followed by zero or more calls to `serialize_element`, + /// then a call to `end`. + /// + /// ```edition2018 + /// use serde::ser::{Serialize, Serializer, SerializeTuple}; + /// + /// # mod fool { + /// # trait Serialize {} + /// impl<A, B, C> Serialize for (A, B, C) + /// # {} + /// # } + /// # + /// # struct Tuple3<A, B, C>(A, B, C); + /// # + /// # impl<A, B, C> Serialize for Tuple3<A, B, C> + /// where + /// A: Serialize, + /// B: Serialize, + /// C: Serialize, + /// { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut tup = serializer.serialize_tuple(3)?; + /// tup.serialize_element(&self.0)?; + /// tup.serialize_element(&self.1)?; + /// tup.serialize_element(&self.2)?; + /// tup.end() + /// } + /// } + /// ``` + /// + /// ```edition2018 + /// use serde::ser::{Serialize, SerializeTuple, Serializer}; + /// + /// const VRAM_SIZE: usize = 386; + /// struct Vram([u16; VRAM_SIZE]); + /// + /// impl Serialize for Vram { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut seq = serializer.serialize_tuple(VRAM_SIZE)?; + /// for element in &self.0[..] { + /// seq.serialize_element(element)?; + /// } + /// seq.end() + /// } + /// } + /// ``` + fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, Self::Error>; + + /// Begin to serialize a tuple struct like `struct Rgb(u8, u8, u8)`. This + /// call must be followed by zero or more calls to `serialize_field`, then a + /// call to `end`. + /// + /// The `name` is the name of the tuple struct and the `len` is the number + /// of data fields that will be serialized. + /// + /// ```edition2018 + /// use serde::ser::{Serialize, SerializeTupleStruct, Serializer}; + /// + /// struct Rgb(u8, u8, u8); + /// + /// impl Serialize for Rgb { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut ts = serializer.serialize_tuple_struct("Rgb", 3)?; + /// ts.serialize_field(&self.0)?; + /// ts.serialize_field(&self.1)?; + /// ts.serialize_field(&self.2)?; + /// ts.end() + /// } + /// } + /// ``` + fn serialize_tuple_struct( + self, + name: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleStruct, Self::Error>; + + /// Begin to serialize a tuple variant like `E::T` in `enum E { T(u8, u8) + /// }`. This call must be followed by zero or more calls to + /// `serialize_field`, then a call to `end`. + /// + /// The `name` is the name of the enum, the `variant_index` is the index of + /// this variant within the enum, the `variant` is the name of the variant, + /// and the `len` is the number of data fields that will be serialized. + /// + /// ```edition2018 + /// use serde::ser::{Serialize, SerializeTupleVariant, Serializer}; + /// + /// enum E { + /// T(u8, u8), + /// U(String, u32, u32), + /// } + /// + /// impl Serialize for E { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match *self { + /// E::T(ref a, ref b) => { + /// let mut tv = serializer.serialize_tuple_variant("E", 0, "T", 2)?; + /// tv.serialize_field(a)?; + /// tv.serialize_field(b)?; + /// tv.end() + /// } + /// E::U(ref a, ref b, ref c) => { + /// let mut tv = serializer.serialize_tuple_variant("E", 1, "U", 3)?; + /// tv.serialize_field(a)?; + /// tv.serialize_field(b)?; + /// tv.serialize_field(c)?; + /// tv.end() + /// } + /// } + /// } + /// } + /// ``` + fn serialize_tuple_variant( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleVariant, Self::Error>; + + /// Begin to serialize a map. This call must be followed by zero or more + /// calls to `serialize_key` and `serialize_value`, then a call to `end`. + /// + /// The argument is the number of elements in the map, which may or may not + /// be computable before the map is iterated. Some serializers only support + /// maps whose length is known up front. + /// + /// ```edition2018 + /// # use std::marker::PhantomData; + /// # + /// # struct HashMap<K, V>(PhantomData<K>, PhantomData<V>); + /// # + /// # impl<K, V> HashMap<K, V> { + /// # fn len(&self) -> usize { + /// # unimplemented!() + /// # } + /// # } + /// # + /// # impl<'a, K, V> IntoIterator for &'a HashMap<K, V> { + /// # type Item = (&'a K, &'a V); + /// # type IntoIter = Box<Iterator<Item = (&'a K, &'a V)>>; + /// # + /// # fn into_iter(self) -> Self::IntoIter { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use serde::ser::{Serialize, Serializer, SerializeMap}; + /// + /// impl<K, V> Serialize for HashMap<K, V> + /// where + /// K: Serialize, + /// V: Serialize, + /// { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut map = serializer.serialize_map(Some(self.len()))?; + /// for (k, v) in self { + /// map.serialize_entry(k, v)?; + /// } + /// map.end() + /// } + /// } + /// ``` + fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error>; + + /// Begin to serialize a struct like `struct Rgb { r: u8, g: u8, b: u8 }`. + /// This call must be followed by zero or more calls to `serialize_field`, + /// then a call to `end`. + /// + /// The `name` is the name of the struct and the `len` is the number of + /// data fields that will be serialized. + /// + /// ```edition2018 + /// use serde::ser::{Serialize, SerializeStruct, Serializer}; + /// + /// struct Rgb { + /// r: u8, + /// g: u8, + /// b: u8, + /// } + /// + /// impl Serialize for Rgb { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// let mut rgb = serializer.serialize_struct("Rgb", 3)?; + /// rgb.serialize_field("r", &self.r)?; + /// rgb.serialize_field("g", &self.g)?; + /// rgb.serialize_field("b", &self.b)?; + /// rgb.end() + /// } + /// } + /// ``` + fn serialize_struct( + self, + name: &'static str, + len: usize, + ) -> Result<Self::SerializeStruct, Self::Error>; + + /// Begin to serialize a struct variant like `E::S` in `enum E { S { r: u8, + /// g: u8, b: u8 } }`. This call must be followed by zero or more calls to + /// `serialize_field`, then a call to `end`. + /// + /// The `name` is the name of the enum, the `variant_index` is the index of + /// this variant within the enum, the `variant` is the name of the variant, + /// and the `len` is the number of data fields that will be serialized. + /// + /// ```edition2018 + /// use serde::ser::{Serialize, SerializeStructVariant, Serializer}; + /// + /// enum E { + /// S { r: u8, g: u8, b: u8 }, + /// } + /// + /// impl Serialize for E { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// match *self { + /// E::S { + /// ref r, + /// ref g, + /// ref b, + /// } => { + /// let mut sv = serializer.serialize_struct_variant("E", 0, "S", 3)?; + /// sv.serialize_field("r", r)?; + /// sv.serialize_field("g", g)?; + /// sv.serialize_field("b", b)?; + /// sv.end() + /// } + /// } + /// } + /// } + /// ``` + fn serialize_struct_variant( + self, + name: &'static str, + variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeStructVariant, Self::Error>; + + /// Collect an iterator as a sequence. + /// + /// The default implementation serializes each item yielded by the iterator + /// using [`serialize_seq`]. Implementors should not need to override this + /// method. + /// + /// ```edition2018 + /// use serde::{Serialize, Serializer}; + /// + /// struct SecretlyOneHigher { + /// data: Vec<i32>, + /// } + /// + /// impl Serialize for SecretlyOneHigher { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.collect_seq(self.data.iter().map(|x| x + 1)) + /// } + /// } + /// ``` + /// + /// [`serialize_seq`]: #tymethod.serialize_seq + fn collect_seq<I>(self, iter: I) -> Result<Self::Ok, Self::Error> + where + I: IntoIterator, + <I as IntoIterator>::Item: Serialize, + { + let iter = iter.into_iter(); + let mut serializer = try!(self.serialize_seq(iterator_len_hint(&iter))); + + #[cfg(not(no_iterator_try_fold))] + { + let mut iter = iter; + try!(iter.try_for_each(|item| serializer.serialize_element(&item))); + } + + #[cfg(no_iterator_try_fold)] + { + for item in iter { + try!(serializer.serialize_element(&item)); + } + } + + serializer.end() + } + + /// Collect an iterator as a map. + /// + /// The default implementation serializes each pair yielded by the iterator + /// using [`serialize_map`]. Implementors should not need to override this + /// method. + /// + /// ```edition2018 + /// use serde::{Serialize, Serializer}; + /// use std::collections::BTreeSet; + /// + /// struct MapToUnit { + /// keys: BTreeSet<i32>, + /// } + /// + /// // Serializes as a map in which the values are all unit. + /// impl Serialize for MapToUnit { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.collect_map(self.keys.iter().map(|k| (k, ()))) + /// } + /// } + /// ``` + /// + /// [`serialize_map`]: #tymethod.serialize_map + fn collect_map<K, V, I>(self, iter: I) -> Result<Self::Ok, Self::Error> + where + K: Serialize, + V: Serialize, + I: IntoIterator<Item = (K, V)>, + { + let iter = iter.into_iter(); + let mut serializer = try!(self.serialize_map(iterator_len_hint(&iter))); + + #[cfg(not(no_iterator_try_fold))] + { + let mut iter = iter; + try!(iter.try_for_each(|(key, value)| serializer.serialize_entry(&key, &value))); + } + + #[cfg(no_iterator_try_fold)] + { + for (key, value) in iter { + try!(serializer.serialize_entry(&key, &value)); + } + } + + serializer.end() + } + + /// Serialize a string produced by an implementation of `Display`. + /// + /// The default implementation builds a heap-allocated [`String`] and + /// delegates to [`serialize_str`]. Serializers are encouraged to provide a + /// more efficient implementation if possible. + /// + /// ```edition2018 + /// # struct DateTime; + /// # + /// # impl DateTime { + /// # fn naive_local(&self) -> () { () } + /// # fn offset(&self) -> () { () } + /// # } + /// # + /// use serde::{Serialize, Serializer}; + /// + /// impl Serialize for DateTime { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.collect_str(&format_args!("{:?}{:?}", + /// self.naive_local(), + /// self.offset())) + /// } + /// } + /// ``` + /// + /// [`String`]: https://doc.rust-lang.org/std/string/struct.String.html + /// [`serialize_str`]: #tymethod.serialize_str + #[cfg(any(feature = "std", feature = "alloc"))] + fn collect_str<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error> + where + T: Display, + { + self.serialize_str(&value.to_string()) + } + + /// Serialize a string produced by an implementation of `Display`. + /// + /// Serializers that use `no_std` are required to provide an implementation + /// of this method. If no more sensible behavior is possible, the + /// implementation is expected to return an error. + /// + /// ```edition2018 + /// # struct DateTime; + /// # + /// # impl DateTime { + /// # fn naive_local(&self) -> () { () } + /// # fn offset(&self) -> () { () } + /// # } + /// # + /// use serde::{Serialize, Serializer}; + /// + /// impl Serialize for DateTime { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// serializer.collect_str(&format_args!("{:?}{:?}", + /// self.naive_local(), + /// self.offset())) + /// } + /// } + /// ``` + #[cfg(not(any(feature = "std", feature = "alloc")))] + fn collect_str<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error> + where + T: Display; + + /// Determine whether `Serialize` implementations should serialize in + /// human-readable form. + /// + /// Some types have a human-readable form that may be somewhat expensive to + /// construct, as well as a binary form that is compact and efficient. + /// Generally text-based formats like JSON and YAML will prefer to use the + /// human-readable one and binary formats like Bincode will prefer the + /// compact one. + /// + /// ```edition2018 + /// # use std::fmt::{self, Display}; + /// # + /// # struct Timestamp; + /// # + /// # impl Timestamp { + /// # fn seconds_since_epoch(&self) -> u64 { unimplemented!() } + /// # } + /// # + /// # impl Display for Timestamp { + /// # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + /// # unimplemented!() + /// # } + /// # } + /// # + /// use serde::{Serialize, Serializer}; + /// + /// impl Serialize for Timestamp { + /// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + /// where + /// S: Serializer, + /// { + /// if serializer.is_human_readable() { + /// // Serialize to a human-readable string "2015-05-15T17:01:00Z". + /// self.to_string().serialize(serializer) + /// } else { + /// // Serialize to a compact binary representation. + /// self.seconds_since_epoch().serialize(serializer) + /// } + /// } + /// } + /// ``` + /// + /// The default implementation of this method returns `true`. Data formats + /// may override this to `false` to request a compact form for types that + /// support one. Note that modifying this method to change a format from + /// human-readable to compact or vice versa should be regarded as a breaking + /// change, as a value serialized in human-readable mode is not required to + /// deserialize from the same data in compact mode. + #[inline] + fn is_human_readable(&self) -> bool { + true + } +} + +/// Returned from `Serializer::serialize_seq`. +/// +/// # Example use +/// +/// ```edition2018 +/// # use std::marker::PhantomData; +/// # +/// # struct Vec<T>(PhantomData<T>); +/// # +/// # impl<T> Vec<T> { +/// # fn len(&self) -> usize { +/// # unimplemented!() +/// # } +/// # } +/// # +/// # impl<'a, T> IntoIterator for &'a Vec<T> { +/// # type Item = &'a T; +/// # type IntoIter = Box<Iterator<Item = &'a T>>; +/// # fn into_iter(self) -> Self::IntoIter { +/// # unimplemented!() +/// # } +/// # } +/// # +/// use serde::ser::{Serialize, Serializer, SerializeSeq}; +/// +/// impl<T> Serialize for Vec<T> +/// where +/// T: Serialize, +/// { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// let mut seq = serializer.serialize_seq(Some(self.len()))?; +/// for element in self { +/// seq.serialize_element(element)?; +/// } +/// seq.end() +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeSeq` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeSeq { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a sequence element. + fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> + where + T: Serialize; + + /// Finish serializing a sequence. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +/// Returned from `Serializer::serialize_tuple`. +/// +/// # Example use +/// +/// ```edition2018 +/// use serde::ser::{Serialize, Serializer, SerializeTuple}; +/// +/// # mod fool { +/// # trait Serialize {} +/// impl<A, B, C> Serialize for (A, B, C) +/// # {} +/// # } +/// # +/// # struct Tuple3<A, B, C>(A, B, C); +/// # +/// # impl<A, B, C> Serialize for Tuple3<A, B, C> +/// where +/// A: Serialize, +/// B: Serialize, +/// C: Serialize, +/// { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// let mut tup = serializer.serialize_tuple(3)?; +/// tup.serialize_element(&self.0)?; +/// tup.serialize_element(&self.1)?; +/// tup.serialize_element(&self.2)?; +/// tup.end() +/// } +/// } +/// ``` +/// +/// ```edition2018 +/// # use std::marker::PhantomData; +/// # +/// # struct Array<T>(PhantomData<T>); +/// # +/// # impl<T> Array<T> { +/// # fn len(&self) -> usize { +/// # unimplemented!() +/// # } +/// # } +/// # +/// # impl<'a, T> IntoIterator for &'a Array<T> { +/// # type Item = &'a T; +/// # type IntoIter = Box<Iterator<Item = &'a T>>; +/// # fn into_iter(self) -> Self::IntoIter { +/// # unimplemented!() +/// # } +/// # } +/// # +/// use serde::ser::{Serialize, Serializer, SerializeTuple}; +/// +/// # mod fool { +/// # trait Serialize {} +/// impl<T> Serialize for [T; 16] +/// # {} +/// # } +/// # +/// # impl<T> Serialize for Array<T> +/// where +/// T: Serialize, +/// { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// let mut seq = serializer.serialize_tuple(16)?; +/// for element in self { +/// seq.serialize_element(element)?; +/// } +/// seq.end() +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeTuple` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeTuple { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a tuple element. + fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> + where + T: Serialize; + + /// Finish serializing a tuple. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +/// Returned from `Serializer::serialize_tuple_struct`. +/// +/// # Example use +/// +/// ```edition2018 +/// use serde::ser::{Serialize, SerializeTupleStruct, Serializer}; +/// +/// struct Rgb(u8, u8, u8); +/// +/// impl Serialize for Rgb { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// let mut ts = serializer.serialize_tuple_struct("Rgb", 3)?; +/// ts.serialize_field(&self.0)?; +/// ts.serialize_field(&self.1)?; +/// ts.serialize_field(&self.2)?; +/// ts.end() +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeTupleStruct` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeTupleStruct { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a tuple struct field. + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> + where + T: Serialize; + + /// Finish serializing a tuple struct. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +/// Returned from `Serializer::serialize_tuple_variant`. +/// +/// # Example use +/// +/// ```edition2018 +/// use serde::ser::{Serialize, SerializeTupleVariant, Serializer}; +/// +/// enum E { +/// T(u8, u8), +/// U(String, u32, u32), +/// } +/// +/// impl Serialize for E { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// match *self { +/// E::T(ref a, ref b) => { +/// let mut tv = serializer.serialize_tuple_variant("E", 0, "T", 2)?; +/// tv.serialize_field(a)?; +/// tv.serialize_field(b)?; +/// tv.end() +/// } +/// E::U(ref a, ref b, ref c) => { +/// let mut tv = serializer.serialize_tuple_variant("E", 1, "U", 3)?; +/// tv.serialize_field(a)?; +/// tv.serialize_field(b)?; +/// tv.serialize_field(c)?; +/// tv.end() +/// } +/// } +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeTupleVariant` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeTupleVariant { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a tuple variant field. + fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> + where + T: Serialize; + + /// Finish serializing a tuple variant. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +/// Returned from `Serializer::serialize_map`. +/// +/// # Example use +/// +/// ```edition2018 +/// # use std::marker::PhantomData; +/// # +/// # struct HashMap<K, V>(PhantomData<K>, PhantomData<V>); +/// # +/// # impl<K, V> HashMap<K, V> { +/// # fn len(&self) -> usize { +/// # unimplemented!() +/// # } +/// # } +/// # +/// # impl<'a, K, V> IntoIterator for &'a HashMap<K, V> { +/// # type Item = (&'a K, &'a V); +/// # type IntoIter = Box<Iterator<Item = (&'a K, &'a V)>>; +/// # +/// # fn into_iter(self) -> Self::IntoIter { +/// # unimplemented!() +/// # } +/// # } +/// # +/// use serde::ser::{Serialize, Serializer, SerializeMap}; +/// +/// impl<K, V> Serialize for HashMap<K, V> +/// where +/// K: Serialize, +/// V: Serialize, +/// { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// let mut map = serializer.serialize_map(Some(self.len()))?; +/// for (k, v) in self { +/// map.serialize_entry(k, v)?; +/// } +/// map.end() +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeMap` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeMap { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a map key. + /// + /// If possible, `Serialize` implementations are encouraged to use + /// `serialize_entry` instead as it may be implemented more efficiently in + /// some formats compared to a pair of calls to `serialize_key` and + /// `serialize_value`. + fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error> + where + T: Serialize; + + /// Serialize a map value. + /// + /// # Panics + /// + /// Calling `serialize_value` before `serialize_key` is incorrect and is + /// allowed to panic or produce bogus results. + fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> + where + T: Serialize; + + /// Serialize a map entry consisting of a key and a value. + /// + /// Some [`Serialize`] types are not able to hold a key and value in memory + /// at the same time so `SerializeMap` implementations are required to + /// support [`serialize_key`] and [`serialize_value`] individually. The + /// `serialize_entry` method allows serializers to optimize for the case + /// where key and value are both available. [`Serialize`] implementations + /// are encouraged to use `serialize_entry` if possible. + /// + /// The default implementation delegates to [`serialize_key`] and + /// [`serialize_value`]. This is appropriate for serializers that do not + /// care about performance or are not able to optimize `serialize_entry` any + /// better than this. + /// + /// [`Serialize`]: ../trait.Serialize.html + /// [`serialize_key`]: #tymethod.serialize_key + /// [`serialize_value`]: #tymethod.serialize_value + fn serialize_entry<K: ?Sized, V: ?Sized>( + &mut self, + key: &K, + value: &V, + ) -> Result<(), Self::Error> + where + K: Serialize, + V: Serialize, + { + try!(self.serialize_key(key)); + self.serialize_value(value) + } + + /// Finish serializing a map. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +/// Returned from `Serializer::serialize_struct`. +/// +/// # Example use +/// +/// ```edition2018 +/// use serde::ser::{Serialize, SerializeStruct, Serializer}; +/// +/// struct Rgb { +/// r: u8, +/// g: u8, +/// b: u8, +/// } +/// +/// impl Serialize for Rgb { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// let mut rgb = serializer.serialize_struct("Rgb", 3)?; +/// rgb.serialize_field("r", &self.r)?; +/// rgb.serialize_field("g", &self.g)?; +/// rgb.serialize_field("b", &self.b)?; +/// rgb.end() +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeStruct` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeStruct { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a struct field. + fn serialize_field<T: ?Sized>( + &mut self, + key: &'static str, + value: &T, + ) -> Result<(), Self::Error> + where + T: Serialize; + + /// Indicate that a struct field has been skipped. + #[inline] + fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error> { + let _ = key; + Ok(()) + } + + /// Finish serializing a struct. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +/// Returned from `Serializer::serialize_struct_variant`. +/// +/// # Example use +/// +/// ```edition2018 +/// use serde::ser::{Serialize, SerializeStructVariant, Serializer}; +/// +/// enum E { +/// S { r: u8, g: u8, b: u8 }, +/// } +/// +/// impl Serialize for E { +/// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> +/// where +/// S: Serializer, +/// { +/// match *self { +/// E::S { +/// ref r, +/// ref g, +/// ref b, +/// } => { +/// let mut sv = serializer.serialize_struct_variant("E", 0, "S", 3)?; +/// sv.serialize_field("r", r)?; +/// sv.serialize_field("g", g)?; +/// sv.serialize_field("b", b)?; +/// sv.end() +/// } +/// } +/// } +/// } +/// ``` +/// +/// # Example implementation +/// +/// The [example data format] presented on the website demonstrates an +/// implementation of `SerializeStructVariant` for a basic JSON data format. +/// +/// [example data format]: https://serde.rs/data-format.html +pub trait SerializeStructVariant { + /// Must match the `Ok` type of our `Serializer`. + type Ok; + + /// Must match the `Error` type of our `Serializer`. + type Error: Error; + + /// Serialize a struct variant field. + fn serialize_field<T: ?Sized>( + &mut self, + key: &'static str, + value: &T, + ) -> Result<(), Self::Error> + where + T: Serialize; + + /// Indicate that a struct variant field has been skipped. + #[inline] + fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error> { + let _ = key; + Ok(()) + } + + /// Finish serializing a struct variant. + fn end(self) -> Result<Self::Ok, Self::Error>; +} + +fn iterator_len_hint<I>(iter: &I) -> Option<usize> +where + I: Iterator, +{ + match iter.size_hint() { + (lo, Some(hi)) if lo == hi => Some(lo), + _ => None, + } +} diff --git a/vendor/serde/src/std_error.rs b/vendor/serde/src/std_error.rs new file mode 100644 index 000000000..1055e0ffb --- /dev/null +++ b/vendor/serde/src/std_error.rs @@ -0,0 +1,48 @@ +use lib::{Debug, Display}; + +/// Either a re-export of std::error::Error or a new identical trait, depending +/// on whether Serde's "std" feature is enabled. +/// +/// Serde's error traits [`serde::ser::Error`] and [`serde::de::Error`] require +/// [`std::error::Error`] as a supertrait, but only when Serde is built with +/// "std" enabled. Data formats that don't care about no\_std support should +/// generally provide their error types with a `std::error::Error` impl +/// directly: +/// +/// ```edition2018 +/// #[derive(Debug)] +/// struct MySerError {...} +/// +/// impl serde::ser::Error for MySerError {...} +/// +/// impl std::fmt::Display for MySerError {...} +/// +/// // We don't support no_std! +/// impl std::error::Error for MySerError {} +/// ``` +/// +/// Data formats that *do* support no\_std may either have a "std" feature of +/// their own: +/// +/// ```toml +/// [features] +/// std = ["serde/std"] +/// ``` +/// +/// ```edition2018 +/// #[cfg(feature = "std")] +/// impl std::error::Error for MySerError {} +/// ``` +/// +/// ... or else provide the std Error impl unconditionally via Serde's +/// re-export: +/// +/// ```edition2018 +/// impl serde::ser::StdError for MySerError {} +/// ``` +pub trait Error: Debug + Display { + /// The underlying cause of this error, if any. + fn source(&self) -> Option<&(Error + 'static)> { + None + } +} diff --git a/vendor/serde_derive/.cargo-checksum.json b/vendor/serde_derive/.cargo-checksum.json new file mode 100644 index 000000000..548b4dd75 --- /dev/null +++ b/vendor/serde_derive/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"1b02082e05fb23a3d9291d91a1097beef2bddb443575716c4ab0e4d0159b5038","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"7049b88cb7366be0c8e593f3ffffa313803a5b382f35686c542b4a0da3b291f3","build.rs":"c01db20e19c31505b26b9e9a5aff1c5327a7501fc88917f372a9e718edcb50ab","crates-io.md":"5c42406936cf9af6d4cd7fe0ac730c609e82fd3f15a54549518c72d0ded70c29","src/bound.rs":"268b4995a5d0a129dcbd6e32ef11f587bd271df3f6c4f7230ed54bc99f5ce871","src/de.rs":"c5a41016ce15f8176a2d7a8445ba06d2eb8de0863c1fea0dab51c395dd7dccff","src/dummy.rs":"cb154465020973be8ab6079ab8574df46f38fbe028a5561cd6b1a8bfa1a35478","src/fragment.rs":"5548ba65a53d90a296f60c1328a7a7fb040db467f59c2f5210b2fb320457145d","src/internals/ast.rs":"b019865eef92c1ddbb9029423ac22179f132dc655a51c09fb2a42f4aaef172fd","src/internals/attr.rs":"778074380c4e353b77e03aff9edf15fda9e15a0e7ec25cdfc51d79a26636ddef","src/internals/case.rs":"9492f0c5142d7b7e8cd39c86d13a855e5ce4489425adb2b96aed89e1b7851ac0","src/internals/check.rs":"11ea94257d2a2ee2276938a6beb4ae11b74c39225c1e342e6df1e7d2b2924496","src/internals/ctxt.rs":"6fa544ae52914498a62a395818ebdc1b36ac2fb5903c60afb741a864ad559f1c","src/internals/mod.rs":"f32138ff19d57eb00f88ba11f6b015efab2102657804f71ebbf386a3698dad91","src/internals/receiver.rs":"cd125ba4a3dd6250ed4737555c58627bffd630a536cd7223068eed7c10a170d8","src/internals/respan.rs":"899753859c58ce5f532a3ec4584796a52f13ed5a0533191e48c953ba5c1b52ff","src/internals/symbol.rs":"3c9ce461773b7df3bb64d82aa5a0d93052c3bb0e60209db6c0b5c10ee9cfc9cf","src/lib.rs":"230ca4a6867faad035a07bed24dfcaee73dc0ab061e5c78094d97e01bb571efa","src/pretend.rs":"4aa53bf6c1350fbcfc8c4997f720cde61a8eb3aab73bb8c101b0f0a74901892b","src/ser.rs":"0d99c841f6c7bc9751ab225fe42d1f8b7fe56e36903efcb4ff10bf6e35c390ba","src/try.rs":"b171b0088c23ebf4bfa07ba457881b41ac5e547d55dd16f737ea988d34badf61"},"package":"6f2122636b9fe3b81f1cb25099fcf2d3f542cdb1d45940d56c713158884a05da"}
\ No newline at end of file diff --git a/vendor/serde_derive/Cargo.toml b/vendor/serde_derive/Cargo.toml new file mode 100644 index 000000000..08789fc4b --- /dev/null +++ b/vendor/serde_derive/Cargo.toml @@ -0,0 +1,61 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +rust-version = "1.31" +name = "serde_derive" +version = "1.0.140" +authors = [ + "Erick Tryzelaar <erick.tryzelaar@gmail.com>", + "David Tolnay <dtolnay@gmail.com>", +] +include = [ + "build.rs", + "src/**/*.rs", + "crates-io.md", + "README.md", + "LICENSE-APACHE", + "LICENSE-MIT", +] +description = "Macros 1.1 implementation of #[derive(Serialize, Deserialize)]" +homepage = "https://serde.rs" +documentation = "https://serde.rs/derive.html" +readme = "crates-io.md" +keywords = [ + "serde", + "serialization", + "no_std", +] +license = "MIT OR Apache-2.0" +repository = "https://github.com/serde-rs/serde" + +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] + +[lib] +name = "serde_derive" +proc-macro = true + +[dependencies.proc-macro2] +version = "1.0" + +[dependencies.quote] +version = "1.0" + +[dependencies.syn] +version = "1.0.90" + +[dev-dependencies.serde] +version = "1.0" + +[features] +default = [] +deserialize_in_place = [] diff --git a/vendor/serde_derive/LICENSE-APACHE b/vendor/serde_derive/LICENSE-APACHE new file mode 100644 index 000000000..16fe87b06 --- /dev/null +++ b/vendor/serde_derive/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/vendor/serde_derive/README.md b/vendor/serde_derive/README.md new file mode 100644 index 000000000..79409a3fc --- /dev/null +++ b/vendor/serde_derive/README.md @@ -0,0 +1,114 @@ +# Serde   [![Build Status]][actions] [![Latest Version]][crates.io] [![serde: rustc 1.13+]][Rust 1.13] [![serde_derive: rustc 1.31+]][Rust 1.31] + +[Build Status]: https://img.shields.io/github/workflow/status/serde-rs/serde/CI/master +[actions]: https://github.com/serde-rs/serde/actions?query=branch%3Amaster +[Latest Version]: https://img.shields.io/crates/v/serde.svg +[crates.io]: https://crates.io/crates/serde +[serde: rustc 1.13+]: https://img.shields.io/badge/serde-rustc_1.13+-lightgray.svg +[serde_derive: rustc 1.31+]: https://img.shields.io/badge/serde_derive-rustc_1.31+-lightgray.svg +[Rust 1.13]: https://blog.rust-lang.org/2016/11/10/Rust-1.13.html +[Rust 1.31]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html + +**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.** + +--- + +You may be looking for: + +- [An overview of Serde](https://serde.rs/) +- [Data formats supported by Serde](https://serde.rs/#data-formats) +- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html) +- [Examples](https://serde.rs/examples.html) +- [API documentation](https://docs.serde.rs/serde/) +- [Release notes](https://github.com/serde-rs/serde/releases) + +## Serde in action + +<details> +<summary> +Click to show Cargo.toml. +<a href="https://play.rust-lang.org/?edition=2018&gist=72755f28f99afc95e01d63174b28c1f5" target="_blank">Run this code in the playground.</a> +</summary> + +```toml +[dependencies] + +# The core APIs, including the Serialize and Deserialize traits. Always +# required when using Serde. The "derive" feature is only required when +# using #[derive(Serialize, Deserialize)] to make Serde work with structs +# and enums defined in your crate. +serde = { version = "1.0", features = ["derive"] } + +# Each data format lives in its own crate; the sample code below uses JSON +# but you may be using a different one. +serde_json = "1.0" +``` + +</details> +<p></p> + +```rust +use serde::{Serialize, Deserialize}; + +#[derive(Serialize, Deserialize, Debug)] +struct Point { + x: i32, + y: i32, +} + +fn main() { + let point = Point { x: 1, y: 2 }; + + // Convert the Point to a JSON string. + let serialized = serde_json::to_string(&point).unwrap(); + + // Prints serialized = {"x":1,"y":2} + println!("serialized = {}", serialized); + + // Convert the JSON string back to a Point. + let deserialized: Point = serde_json::from_str(&serialized).unwrap(); + + // Prints deserialized = Point { x: 1, y: 2 } + println!("deserialized = {:?}", deserialized); +} +``` + +## Getting help + +Serde is one of the most widely used Rust libraries so any place that Rustaceans +congregate will be able to help you out. For chat, consider trying the +[#rust-questions] or [#rust-beginners] channels of the unofficial community +Discord (invite: <https://discord.gg/rust-lang-community>), the [#rust-usage] or +[#beginners] channels of the official Rust Project Discord (invite: +<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For +asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the +[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust +[Discourse forum][discourse]. It's acceptable to file a support issue in this +repo but they tend not to get as many eyes as any of the above and may get +closed without a response after some time. + +[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513 +[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281 +[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848 +[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612 +[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general +[stackoverflow]: https://stackoverflow.com/questions/tagged/rust +[/r/rust]: https://www.reddit.com/r/rust +[discourse]: https://users.rust-lang.org + +<br> + +#### License + +<sup> +Licensed under either of <a href="LICENSE-APACHE">Apache License, Version +2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option. +</sup> + +<br> + +<sub> +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in Serde by you, as defined in the Apache-2.0 license, shall be +dual licensed as above, without any additional terms or conditions. +</sub> diff --git a/vendor/serde_derive/build.rs b/vendor/serde_derive/build.rs new file mode 100644 index 000000000..2aece0469 --- /dev/null +++ b/vendor/serde_derive/build.rs @@ -0,0 +1,36 @@ +use std::env; +use std::process::Command; +use std::str; + +// The rustc-cfg strings below are *not* public API. Please let us know by +// opening a GitHub issue if your build environment requires some way to enable +// these cfgs other than by executing our build script. +fn main() { + let minor = match rustc_minor_version() { + Some(minor) => minor, + None => return, + }; + + // Underscore const names stabilized in Rust 1.37: + // https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html#using-unnamed-const-items-for-macros + if minor < 37 { + println!("cargo:rustc-cfg=no_underscore_consts"); + } + + // The ptr::addr_of! macro stabilized in Rust 1.51: + // https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#stabilized-apis + if minor < 51 { + println!("cargo:rustc-cfg=no_ptr_addr_of"); + } +} + +fn rustc_minor_version() -> Option<u32> { + let rustc = env::var_os("RUSTC")?; + let output = Command::new(rustc).arg("--version").output().ok()?; + let version = str::from_utf8(&output.stdout).ok()?; + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + pieces.next()?.parse().ok() +} diff --git a/vendor/serde_derive/crates-io.md b/vendor/serde_derive/crates-io.md new file mode 100644 index 000000000..b57bc5fd0 --- /dev/null +++ b/vendor/serde_derive/crates-io.md @@ -0,0 +1,65 @@ +<!-- Serde readme rendered on crates.io --> + +**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.** + +--- + +You may be looking for: + +- [An overview of Serde](https://serde.rs/) +- [Data formats supported by Serde](https://serde.rs/#data-formats) +- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html) +- [Examples](https://serde.rs/examples.html) +- [API documentation](https://docs.serde.rs/serde/) +- [Release notes](https://github.com/serde-rs/serde/releases) + +## Serde in action + +```rust +use serde::{Serialize, Deserialize}; + +#[derive(Serialize, Deserialize, Debug)] +struct Point { + x: i32, + y: i32, +} + +fn main() { + let point = Point { x: 1, y: 2 }; + + // Convert the Point to a JSON string. + let serialized = serde_json::to_string(&point).unwrap(); + + // Prints serialized = {"x":1,"y":2} + println!("serialized = {}", serialized); + + // Convert the JSON string back to a Point. + let deserialized: Point = serde_json::from_str(&serialized).unwrap(); + + // Prints deserialized = Point { x: 1, y: 2 } + println!("deserialized = {:?}", deserialized); +} +``` + +## Getting help + +Serde is one of the most widely used Rust libraries so any place that Rustaceans +congregate will be able to help you out. For chat, consider trying the +[#rust-questions] or [#rust-beginners] channels of the unofficial community +Discord (invite: <https://discord.gg/rust-lang-community>, the [#rust-usage] or +[#beginners] channels of the official Rust Project Discord (invite: +<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For +asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the +[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust +[Discourse forum][discourse]. It's acceptable to file a support issue in this +repo but they tend not to get as many eyes as any of the above and may get +closed without a response after some time. + +[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513 +[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281 +[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848 +[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612 +[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general +[stackoverflow]: https://stackoverflow.com/questions/tagged/rust +[/r/rust]: https://www.reddit.com/r/rust +[discourse]: https://users.rust-lang.org diff --git a/vendor/serde_derive/src/bound.rs b/vendor/serde_derive/src/bound.rs new file mode 100644 index 000000000..74c95069c --- /dev/null +++ b/vendor/serde_derive/src/bound.rs @@ -0,0 +1,406 @@ +use std::collections::HashSet; + +use syn; +use syn::punctuated::{Pair, Punctuated}; + +use internals::ast::{Container, Data}; +use internals::{attr, ungroup}; + +use proc_macro2::Span; + +// Remove the default from every type parameter because in the generated impls +// they look like associated types: "error: associated type bindings are not +// allowed here". +pub fn without_defaults(generics: &syn::Generics) -> syn::Generics { + syn::Generics { + params: generics + .params + .iter() + .map(|param| match param { + syn::GenericParam::Type(param) => syn::GenericParam::Type(syn::TypeParam { + eq_token: None, + default: None, + ..param.clone() + }), + _ => param.clone(), + }) + .collect(), + ..generics.clone() + } +} + +pub fn with_where_predicates( + generics: &syn::Generics, + predicates: &[syn::WherePredicate], +) -> syn::Generics { + let mut generics = generics.clone(); + generics + .make_where_clause() + .predicates + .extend(predicates.iter().cloned()); + generics +} + +pub fn with_where_predicates_from_fields( + cont: &Container, + generics: &syn::Generics, + from_field: fn(&attr::Field) -> Option<&[syn::WherePredicate]>, +) -> syn::Generics { + let predicates = cont + .data + .all_fields() + .filter_map(|field| from_field(&field.attrs)) + .flat_map(<[syn::WherePredicate]>::to_vec); + + let mut generics = generics.clone(); + generics.make_where_clause().predicates.extend(predicates); + generics +} + +pub fn with_where_predicates_from_variants( + cont: &Container, + generics: &syn::Generics, + from_variant: fn(&attr::Variant) -> Option<&[syn::WherePredicate]>, +) -> syn::Generics { + let variants = match &cont.data { + Data::Enum(variants) => variants, + Data::Struct(_, _) => { + return generics.clone(); + } + }; + + let predicates = variants + .iter() + .filter_map(|variant| from_variant(&variant.attrs)) + .flat_map(<[syn::WherePredicate]>::to_vec); + + let mut generics = generics.clone(); + generics.make_where_clause().predicates.extend(predicates); + generics +} + +// Puts the given bound on any generic type parameters that are used in fields +// for which filter returns true. +// +// For example, the following struct needs the bound `A: Serialize, B: +// Serialize`. +// +// struct S<'b, A, B: 'b, C> { +// a: A, +// b: Option<&'b B> +// #[serde(skip_serializing)] +// c: C, +// } +pub fn with_bound( + cont: &Container, + generics: &syn::Generics, + filter: fn(&attr::Field, Option<&attr::Variant>) -> bool, + bound: &syn::Path, +) -> syn::Generics { + struct FindTyParams<'ast> { + // Set of all generic type parameters on the current struct (A, B, C in + // the example). Initialized up front. + all_type_params: HashSet<syn::Ident>, + + // Set of generic type parameters used in fields for which filter + // returns true (A and B in the example). Filled in as the visitor sees + // them. + relevant_type_params: HashSet<syn::Ident>, + + // Fields whose type is an associated type of one of the generic type + // parameters. + associated_type_usage: Vec<&'ast syn::TypePath>, + } + + impl<'ast> FindTyParams<'ast> { + fn visit_field(&mut self, field: &'ast syn::Field) { + if let syn::Type::Path(ty) = ungroup(&field.ty) { + if let Some(Pair::Punctuated(t, _)) = ty.path.segments.pairs().next() { + if self.all_type_params.contains(&t.ident) { + self.associated_type_usage.push(ty); + } + } + } + self.visit_type(&field.ty); + } + + fn visit_path(&mut self, path: &'ast syn::Path) { + if let Some(seg) = path.segments.last() { + if seg.ident == "PhantomData" { + // Hardcoded exception, because PhantomData<T> implements + // Serialize and Deserialize whether or not T implements it. + return; + } + } + if path.leading_colon.is_none() && path.segments.len() == 1 { + let id = &path.segments[0].ident; + if self.all_type_params.contains(id) { + self.relevant_type_params.insert(id.clone()); + } + } + for segment in &path.segments { + self.visit_path_segment(segment); + } + } + + // Everything below is simply traversing the syntax tree. + + fn visit_type(&mut self, ty: &'ast syn::Type) { + match ty { + syn::Type::Array(ty) => self.visit_type(&ty.elem), + syn::Type::BareFn(ty) => { + for arg in &ty.inputs { + self.visit_type(&arg.ty); + } + self.visit_return_type(&ty.output); + } + syn::Type::Group(ty) => self.visit_type(&ty.elem), + syn::Type::ImplTrait(ty) => { + for bound in &ty.bounds { + self.visit_type_param_bound(bound); + } + } + syn::Type::Macro(ty) => self.visit_macro(&ty.mac), + syn::Type::Paren(ty) => self.visit_type(&ty.elem), + syn::Type::Path(ty) => { + if let Some(qself) = &ty.qself { + self.visit_type(&qself.ty); + } + self.visit_path(&ty.path); + } + syn::Type::Ptr(ty) => self.visit_type(&ty.elem), + syn::Type::Reference(ty) => self.visit_type(&ty.elem), + syn::Type::Slice(ty) => self.visit_type(&ty.elem), + syn::Type::TraitObject(ty) => { + for bound in &ty.bounds { + self.visit_type_param_bound(bound); + } + } + syn::Type::Tuple(ty) => { + for elem in &ty.elems { + self.visit_type(elem); + } + } + + syn::Type::Infer(_) | syn::Type::Never(_) | syn::Type::Verbatim(_) => {} + + #[cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + _ => {} + } + } + + fn visit_path_segment(&mut self, segment: &'ast syn::PathSegment) { + self.visit_path_arguments(&segment.arguments); + } + + fn visit_path_arguments(&mut self, arguments: &'ast syn::PathArguments) { + match arguments { + syn::PathArguments::None => {} + syn::PathArguments::AngleBracketed(arguments) => { + for arg in &arguments.args { + match arg { + syn::GenericArgument::Type(arg) => self.visit_type(arg), + syn::GenericArgument::Binding(arg) => self.visit_type(&arg.ty), + syn::GenericArgument::Lifetime(_) + | syn::GenericArgument::Constraint(_) + | syn::GenericArgument::Const(_) => {} + } + } + } + syn::PathArguments::Parenthesized(arguments) => { + for argument in &arguments.inputs { + self.visit_type(argument); + } + self.visit_return_type(&arguments.output); + } + } + } + + fn visit_return_type(&mut self, return_type: &'ast syn::ReturnType) { + match return_type { + syn::ReturnType::Default => {} + syn::ReturnType::Type(_, output) => self.visit_type(output), + } + } + + fn visit_type_param_bound(&mut self, bound: &'ast syn::TypeParamBound) { + match bound { + syn::TypeParamBound::Trait(bound) => self.visit_path(&bound.path), + syn::TypeParamBound::Lifetime(_) => {} + } + } + + // Type parameter should not be considered used by a macro path. + // + // struct TypeMacro<T> { + // mac: T!(), + // marker: PhantomData<T>, + // } + fn visit_macro(&mut self, _mac: &'ast syn::Macro) {} + } + + let all_type_params = generics + .type_params() + .map(|param| param.ident.clone()) + .collect(); + + let mut visitor = FindTyParams { + all_type_params, + relevant_type_params: HashSet::new(), + associated_type_usage: Vec::new(), + }; + match &cont.data { + Data::Enum(variants) => { + for variant in variants.iter() { + let relevant_fields = variant + .fields + .iter() + .filter(|field| filter(&field.attrs, Some(&variant.attrs))); + for field in relevant_fields { + visitor.visit_field(field.original); + } + } + } + Data::Struct(_, fields) => { + for field in fields.iter().filter(|field| filter(&field.attrs, None)) { + visitor.visit_field(field.original); + } + } + } + + let relevant_type_params = visitor.relevant_type_params; + let associated_type_usage = visitor.associated_type_usage; + let new_predicates = generics + .type_params() + .map(|param| param.ident.clone()) + .filter(|id| relevant_type_params.contains(id)) + .map(|id| syn::TypePath { + qself: None, + path: id.into(), + }) + .chain(associated_type_usage.into_iter().cloned()) + .map(|bounded_ty| { + syn::WherePredicate::Type(syn::PredicateType { + lifetimes: None, + // the type parameter that is being bounded e.g. T + bounded_ty: syn::Type::Path(bounded_ty), + colon_token: <Token![:]>::default(), + // the bound e.g. Serialize + bounds: vec![syn::TypeParamBound::Trait(syn::TraitBound { + paren_token: None, + modifier: syn::TraitBoundModifier::None, + lifetimes: None, + path: bound.clone(), + })] + .into_iter() + .collect(), + }) + }); + + let mut generics = generics.clone(); + generics + .make_where_clause() + .predicates + .extend(new_predicates); + generics +} + +pub fn with_self_bound( + cont: &Container, + generics: &syn::Generics, + bound: &syn::Path, +) -> syn::Generics { + let mut generics = generics.clone(); + generics + .make_where_clause() + .predicates + .push(syn::WherePredicate::Type(syn::PredicateType { + lifetimes: None, + // the type that is being bounded e.g. MyStruct<'a, T> + bounded_ty: type_of_item(cont), + colon_token: <Token![:]>::default(), + // the bound e.g. Default + bounds: vec![syn::TypeParamBound::Trait(syn::TraitBound { + paren_token: None, + modifier: syn::TraitBoundModifier::None, + lifetimes: None, + path: bound.clone(), + })] + .into_iter() + .collect(), + })); + generics +} + +pub fn with_lifetime_bound(generics: &syn::Generics, lifetime: &str) -> syn::Generics { + let bound = syn::Lifetime::new(lifetime, Span::call_site()); + let def = syn::LifetimeDef { + attrs: Vec::new(), + lifetime: bound.clone(), + colon_token: None, + bounds: Punctuated::new(), + }; + + let params = Some(syn::GenericParam::Lifetime(def)) + .into_iter() + .chain(generics.params.iter().cloned().map(|mut param| { + match &mut param { + syn::GenericParam::Lifetime(param) => { + param.bounds.push(bound.clone()); + } + syn::GenericParam::Type(param) => { + param + .bounds + .push(syn::TypeParamBound::Lifetime(bound.clone())); + } + syn::GenericParam::Const(_) => {} + } + param + })) + .collect(); + + syn::Generics { + params, + ..generics.clone() + } +} + +fn type_of_item(cont: &Container) -> syn::Type { + syn::Type::Path(syn::TypePath { + qself: None, + path: syn::Path { + leading_colon: None, + segments: vec![syn::PathSegment { + ident: cont.ident.clone(), + arguments: syn::PathArguments::AngleBracketed( + syn::AngleBracketedGenericArguments { + colon2_token: None, + lt_token: <Token![<]>::default(), + args: cont + .generics + .params + .iter() + .map(|param| match param { + syn::GenericParam::Type(param) => { + syn::GenericArgument::Type(syn::Type::Path(syn::TypePath { + qself: None, + path: param.ident.clone().into(), + })) + } + syn::GenericParam::Lifetime(param) => { + syn::GenericArgument::Lifetime(param.lifetime.clone()) + } + syn::GenericParam::Const(_) => { + panic!("Serde does not support const generics yet"); + } + }) + .collect(), + gt_token: <Token![>]>::default(), + }, + ), + }] + .into_iter() + .collect(), + }, + }) +} diff --git a/vendor/serde_derive/src/de.rs b/vendor/serde_derive/src/de.rs new file mode 100644 index 000000000..ff7bc42f4 --- /dev/null +++ b/vendor/serde_derive/src/de.rs @@ -0,0 +1,3132 @@ +use proc_macro2::{Literal, Span, TokenStream}; +use quote::ToTokens; +use syn::punctuated::Punctuated; +use syn::spanned::Spanned; +use syn::{self, Ident, Index, Member}; + +use bound; +use dummy; +use fragment::{Expr, Fragment, Match, Stmts}; +use internals::ast::{Container, Data, Field, Style, Variant}; +use internals::{attr, replace_receiver, ungroup, Ctxt, Derive}; +use pretend; + +use std::collections::BTreeSet; +use std::ptr; + +pub fn expand_derive_deserialize( + input: &mut syn::DeriveInput, +) -> Result<TokenStream, Vec<syn::Error>> { + replace_receiver(input); + + let ctxt = Ctxt::new(); + let cont = match Container::from_ast(&ctxt, input, Derive::Deserialize) { + Some(cont) => cont, + None => return Err(ctxt.check().unwrap_err()), + }; + precondition(&ctxt, &cont); + ctxt.check()?; + + let ident = &cont.ident; + let params = Parameters::new(&cont); + let (de_impl_generics, _, ty_generics, where_clause) = split_with_de_lifetime(¶ms); + let body = Stmts(deserialize_body(&cont, ¶ms)); + let delife = params.borrowed.de_lifetime(); + let serde = cont.attrs.serde_path(); + + let impl_block = if let Some(remote) = cont.attrs.remote() { + let vis = &input.vis; + let used = pretend::pretend_used(&cont, params.is_packed); + quote! { + impl #de_impl_generics #ident #ty_generics #where_clause { + #vis fn deserialize<__D>(__deserializer: __D) -> #serde::__private::Result<#remote #ty_generics, __D::Error> + where + __D: #serde::Deserializer<#delife>, + { + #used + #body + } + } + } + } else { + let fn_deserialize_in_place = deserialize_in_place_body(&cont, ¶ms); + + quote! { + #[automatically_derived] + impl #de_impl_generics #serde::Deserialize<#delife> for #ident #ty_generics #where_clause { + fn deserialize<__D>(__deserializer: __D) -> #serde::__private::Result<Self, __D::Error> + where + __D: #serde::Deserializer<#delife>, + { + #body + } + + #fn_deserialize_in_place + } + } + }; + + Ok(dummy::wrap_in_const( + cont.attrs.custom_serde_path(), + "DESERIALIZE", + ident, + impl_block, + )) +} + +fn precondition(cx: &Ctxt, cont: &Container) { + precondition_sized(cx, cont); + precondition_no_de_lifetime(cx, cont); +} + +fn precondition_sized(cx: &Ctxt, cont: &Container) { + if let Data::Struct(_, fields) = &cont.data { + if let Some(last) = fields.last() { + if let syn::Type::Slice(_) = ungroup(last.ty) { + cx.error_spanned_by( + cont.original, + "cannot deserialize a dynamically sized struct", + ); + } + } + } +} + +fn precondition_no_de_lifetime(cx: &Ctxt, cont: &Container) { + if let BorrowedLifetimes::Borrowed(_) = borrowed_lifetimes(cont) { + for param in cont.generics.lifetimes() { + if param.lifetime.to_string() == "'de" { + cx.error_spanned_by( + ¶m.lifetime, + "cannot deserialize when there is a lifetime parameter called 'de", + ); + return; + } + } + } +} + +struct Parameters { + /// Name of the type the `derive` is on. + local: syn::Ident, + + /// Path to the type the impl is for. Either a single `Ident` for local + /// types or `some::remote::Ident` for remote types. Does not include + /// generic parameters. + this: syn::Path, + + /// Generics including any explicit and inferred bounds for the impl. + generics: syn::Generics, + + /// Lifetimes borrowed from the deserializer. These will become bounds on + /// the `'de` lifetime of the deserializer. + borrowed: BorrowedLifetimes, + + /// At least one field has a serde(getter) attribute, implying that the + /// remote type has a private field. + has_getter: bool, + + /// Type has a repr(packed) attribute. + is_packed: bool, +} + +impl Parameters { + fn new(cont: &Container) -> Self { + let local = cont.ident.clone(); + let this = match cont.attrs.remote() { + Some(remote) => remote.clone(), + None => cont.ident.clone().into(), + }; + let borrowed = borrowed_lifetimes(cont); + let generics = build_generics(cont, &borrowed); + let has_getter = cont.data.has_getter(); + let is_packed = cont.attrs.is_packed(); + + Parameters { + local, + this, + generics, + borrowed, + has_getter, + is_packed, + } + } + + /// Type name to use in error messages and `&'static str` arguments to + /// various Deserializer methods. + fn type_name(&self) -> String { + self.this.segments.last().unwrap().ident.to_string() + } +} + +// All the generics in the input, plus a bound `T: Deserialize` for each generic +// field type that will be deserialized by us, plus a bound `T: Default` for +// each generic field type that will be set to a default value. +fn build_generics(cont: &Container, borrowed: &BorrowedLifetimes) -> syn::Generics { + let generics = bound::without_defaults(cont.generics); + + let generics = bound::with_where_predicates_from_fields(cont, &generics, attr::Field::de_bound); + + let generics = + bound::with_where_predicates_from_variants(cont, &generics, attr::Variant::de_bound); + + match cont.attrs.de_bound() { + Some(predicates) => bound::with_where_predicates(&generics, predicates), + None => { + let generics = match *cont.attrs.default() { + attr::Default::Default => bound::with_self_bound( + cont, + &generics, + &parse_quote!(_serde::__private::Default), + ), + attr::Default::None | attr::Default::Path(_) => generics, + }; + + let delife = borrowed.de_lifetime(); + let generics = bound::with_bound( + cont, + &generics, + needs_deserialize_bound, + &parse_quote!(_serde::Deserialize<#delife>), + ); + + bound::with_bound( + cont, + &generics, + requires_default, + &parse_quote!(_serde::__private::Default), + ) + } + } +} + +// Fields with a `skip_deserializing` or `deserialize_with` attribute, or which +// belong to a variant with a `skip_deserializing` or `deserialize_with` +// attribute, are not deserialized by us so we do not generate a bound. Fields +// with a `bound` attribute specify their own bound so we do not generate one. +// All other fields may need a `T: Deserialize` bound where T is the type of the +// field. +fn needs_deserialize_bound(field: &attr::Field, variant: Option<&attr::Variant>) -> bool { + !field.skip_deserializing() + && field.deserialize_with().is_none() + && field.de_bound().is_none() + && variant.map_or(true, |variant| { + !variant.skip_deserializing() + && variant.deserialize_with().is_none() + && variant.de_bound().is_none() + }) +} + +// Fields with a `default` attribute (not `default=...`), and fields with a +// `skip_deserializing` attribute that do not also have `default=...`. +fn requires_default(field: &attr::Field, _variant: Option<&attr::Variant>) -> bool { + if let attr::Default::Default = *field.default() { + true + } else { + false + } +} + +enum BorrowedLifetimes { + Borrowed(BTreeSet<syn::Lifetime>), + Static, +} + +impl BorrowedLifetimes { + fn de_lifetime(&self) -> syn::Lifetime { + match *self { + BorrowedLifetimes::Borrowed(_) => syn::Lifetime::new("'de", Span::call_site()), + BorrowedLifetimes::Static => syn::Lifetime::new("'static", Span::call_site()), + } + } + + fn de_lifetime_def(&self) -> Option<syn::LifetimeDef> { + match self { + BorrowedLifetimes::Borrowed(bounds) => Some(syn::LifetimeDef { + attrs: Vec::new(), + lifetime: syn::Lifetime::new("'de", Span::call_site()), + colon_token: None, + bounds: bounds.iter().cloned().collect(), + }), + BorrowedLifetimes::Static => None, + } + } +} + +// The union of lifetimes borrowed by each field of the container. +// +// These turn into bounds on the `'de` lifetime of the Deserialize impl. If +// lifetimes `'a` and `'b` are borrowed but `'c` is not, the impl is: +// +// impl<'de: 'a + 'b, 'a, 'b, 'c> Deserialize<'de> for S<'a, 'b, 'c> +// +// If any borrowed lifetime is `'static`, then `'de: 'static` would be redundant +// and we use plain `'static` instead of `'de`. +fn borrowed_lifetimes(cont: &Container) -> BorrowedLifetimes { + let mut lifetimes = BTreeSet::new(); + for field in cont.data.all_fields() { + if !field.attrs.skip_deserializing() { + lifetimes.extend(field.attrs.borrowed_lifetimes().iter().cloned()); + } + } + if lifetimes.iter().any(|b| b.to_string() == "'static") { + BorrowedLifetimes::Static + } else { + BorrowedLifetimes::Borrowed(lifetimes) + } +} + +fn deserialize_body(cont: &Container, params: &Parameters) -> Fragment { + if cont.attrs.transparent() { + deserialize_transparent(cont, params) + } else if let Some(type_from) = cont.attrs.type_from() { + deserialize_from(type_from) + } else if let Some(type_try_from) = cont.attrs.type_try_from() { + deserialize_try_from(type_try_from) + } else if let attr::Identifier::No = cont.attrs.identifier() { + match &cont.data { + Data::Enum(variants) => deserialize_enum(params, variants, &cont.attrs), + Data::Struct(Style::Struct, fields) => { + deserialize_struct(None, params, fields, &cont.attrs, None, &Untagged::No) + } + Data::Struct(Style::Tuple, fields) | Data::Struct(Style::Newtype, fields) => { + deserialize_tuple(None, params, fields, &cont.attrs, None) + } + Data::Struct(Style::Unit, _) => deserialize_unit_struct(params, &cont.attrs), + } + } else { + match &cont.data { + Data::Enum(variants) => deserialize_custom_identifier(params, variants, &cont.attrs), + Data::Struct(_, _) => unreachable!("checked in serde_derive_internals"), + } + } +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_in_place_body(cont: &Container, params: &Parameters) -> Option<Stmts> { + // Only remote derives have getters, and we do not generate + // deserialize_in_place for remote derives. + assert!(!params.has_getter); + + if cont.attrs.transparent() + || cont.attrs.type_from().is_some() + || cont.attrs.type_try_from().is_some() + || cont.attrs.identifier().is_some() + || cont + .data + .all_fields() + .all(|f| f.attrs.deserialize_with().is_some()) + { + return None; + } + + let code = match &cont.data { + Data::Struct(Style::Struct, fields) => { + deserialize_struct_in_place(None, params, fields, &cont.attrs, None)? + } + Data::Struct(Style::Tuple, fields) | Data::Struct(Style::Newtype, fields) => { + deserialize_tuple_in_place(None, params, fields, &cont.attrs, None) + } + Data::Enum(_) | Data::Struct(Style::Unit, _) => { + return None; + } + }; + + let delife = params.borrowed.de_lifetime(); + let stmts = Stmts(code); + + let fn_deserialize_in_place = quote_block! { + fn deserialize_in_place<__D>(__deserializer: __D, __place: &mut Self) -> _serde::__private::Result<(), __D::Error> + where + __D: _serde::Deserializer<#delife>, + { + #stmts + } + }; + + Some(Stmts(fn_deserialize_in_place)) +} + +#[cfg(not(feature = "deserialize_in_place"))] +fn deserialize_in_place_body(_cont: &Container, _params: &Parameters) -> Option<Stmts> { + None +} + +fn deserialize_transparent(cont: &Container, params: &Parameters) -> Fragment { + let fields = match &cont.data { + Data::Struct(_, fields) => fields, + Data::Enum(_) => unreachable!(), + }; + + let this = ¶ms.this; + let transparent_field = fields.iter().find(|f| f.attrs.transparent()).unwrap(); + + let path = match transparent_field.attrs.deserialize_with() { + Some(path) => quote!(#path), + None => { + let span = transparent_field.original.span(); + quote_spanned!(span=> _serde::Deserialize::deserialize) + } + }; + + let assign = fields.iter().map(|field| { + let member = &field.member; + if ptr::eq(field, transparent_field) { + quote!(#member: __transparent) + } else { + let value = match field.attrs.default() { + attr::Default::Default => quote!(_serde::__private::Default::default()), + attr::Default::Path(path) => quote!(#path()), + attr::Default::None => quote!(_serde::__private::PhantomData), + }; + quote!(#member: #value) + } + }); + + quote_block! { + _serde::__private::Result::map( + #path(__deserializer), + |__transparent| #this { #(#assign),* }) + } +} + +fn deserialize_from(type_from: &syn::Type) -> Fragment { + quote_block! { + _serde::__private::Result::map( + <#type_from as _serde::Deserialize>::deserialize(__deserializer), + _serde::__private::From::from) + } +} + +fn deserialize_try_from(type_try_from: &syn::Type) -> Fragment { + quote_block! { + _serde::__private::Result::and_then( + <#type_try_from as _serde::Deserialize>::deserialize(__deserializer), + |v| _serde::__private::TryFrom::try_from(v).map_err(_serde::de::Error::custom)) + } +} + +fn deserialize_unit_struct(params: &Parameters, cattrs: &attr::Container) -> Fragment { + let this = ¶ms.this; + let type_name = cattrs.name().deserialize_name(); + + let expecting = format!("unit struct {}", params.type_name()); + let expecting = cattrs.expecting().unwrap_or(&expecting); + + quote_block! { + struct __Visitor; + + impl<'de> _serde::de::Visitor<'de> for __Visitor { + type Value = #this; + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + #[inline] + fn visit_unit<__E>(self) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(#this) + } + } + + _serde::Deserializer::deserialize_unit_struct(__deserializer, #type_name, __Visitor) + } +} + +fn deserialize_tuple( + variant_ident: Option<&syn::Ident>, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, + deserializer: Option<TokenStream>, +) -> Fragment { + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + assert!(!cattrs.has_flatten()); + + // If there are getters (implying private fields), construct the local type + // and use an `Into` conversion to get the remote type. If there are no + // getters then construct the target type directly. + let construct = if params.has_getter { + let local = ¶ms.local; + quote!(#local) + } else { + quote!(#this) + }; + + let is_enum = variant_ident.is_some(); + let type_path = match variant_ident { + Some(variant_ident) => quote!(#construct::#variant_ident), + None => construct, + }; + let expecting = match variant_ident { + Some(variant_ident) => format!("tuple variant {}::{}", params.type_name(), variant_ident), + None => format!("tuple struct {}", params.type_name()), + }; + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let nfields = fields.len(); + + let visit_newtype_struct = if !is_enum && nfields == 1 { + Some(deserialize_newtype_struct(&type_path, params, &fields[0])) + } else { + None + }; + + let visit_seq = Stmts(deserialize_seq( + &type_path, params, fields, false, cattrs, expecting, + )); + + let visitor_expr = quote! { + __Visitor { + marker: _serde::__private::PhantomData::<#this #ty_generics>, + lifetime: _serde::__private::PhantomData, + } + }; + let dispatch = if let Some(deserializer) = deserializer { + quote!(_serde::Deserializer::deserialize_tuple(#deserializer, #nfields, #visitor_expr)) + } else if is_enum { + quote!(_serde::de::VariantAccess::tuple_variant(__variant, #nfields, #visitor_expr)) + } else if nfields == 1 { + let type_name = cattrs.name().deserialize_name(); + quote!(_serde::Deserializer::deserialize_newtype_struct(__deserializer, #type_name, #visitor_expr)) + } else { + let type_name = cattrs.name().deserialize_name(); + quote!(_serde::Deserializer::deserialize_tuple_struct(__deserializer, #type_name, #nfields, #visitor_expr)) + }; + + let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing()); + let visitor_var = if all_skipped { + quote!(_) + } else { + quote!(mut __seq) + }; + + quote_block! { + struct __Visitor #de_impl_generics #where_clause { + marker: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + #visit_newtype_struct + + #[inline] + fn visit_seq<__A>(self, #visitor_var: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::SeqAccess<#delife>, + { + #visit_seq + } + } + + #dispatch + } +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_tuple_in_place( + variant_ident: Option<syn::Ident>, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, + deserializer: Option<TokenStream>, +) -> Fragment { + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + assert!(!cattrs.has_flatten()); + + let is_enum = variant_ident.is_some(); + let expecting = match variant_ident { + Some(variant_ident) => format!("tuple variant {}::{}", params.type_name(), variant_ident), + None => format!("tuple struct {}", params.type_name()), + }; + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let nfields = fields.len(); + + let visit_newtype_struct = if !is_enum && nfields == 1 { + Some(deserialize_newtype_struct_in_place(params, &fields[0])) + } else { + None + }; + + let visit_seq = Stmts(deserialize_seq_in_place(params, fields, cattrs, expecting)); + + let visitor_expr = quote! { + __Visitor { + place: __place, + lifetime: _serde::__private::PhantomData, + } + }; + + let dispatch = if let Some(deserializer) = deserializer { + quote!(_serde::Deserializer::deserialize_tuple(#deserializer, #nfields, #visitor_expr)) + } else if is_enum { + quote!(_serde::de::VariantAccess::tuple_variant(__variant, #nfields, #visitor_expr)) + } else if nfields == 1 { + let type_name = cattrs.name().deserialize_name(); + quote!(_serde::Deserializer::deserialize_newtype_struct(__deserializer, #type_name, #visitor_expr)) + } else { + let type_name = cattrs.name().deserialize_name(); + quote!(_serde::Deserializer::deserialize_tuple_struct(__deserializer, #type_name, #nfields, #visitor_expr)) + }; + + let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing()); + let visitor_var = if all_skipped { + quote!(_) + } else { + quote!(mut __seq) + }; + + let in_place_impl_generics = de_impl_generics.in_place(); + let in_place_ty_generics = de_ty_generics.in_place(); + let place_life = place_lifetime(); + + quote_block! { + struct __Visitor #in_place_impl_generics #where_clause { + place: &#place_life mut #this #ty_generics, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #in_place_impl_generics _serde::de::Visitor<#delife> for __Visitor #in_place_ty_generics #where_clause { + type Value = (); + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + #visit_newtype_struct + + #[inline] + fn visit_seq<__A>(self, #visitor_var: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::SeqAccess<#delife>, + { + #visit_seq + } + } + + #dispatch + } +} + +fn deserialize_seq( + type_path: &TokenStream, + params: &Parameters, + fields: &[Field], + is_struct: bool, + cattrs: &attr::Container, + expecting: &str, +) -> Fragment { + let vars = (0..fields.len()).map(field_i as fn(_) -> _); + + let deserialized_count = fields + .iter() + .filter(|field| !field.attrs.skip_deserializing()) + .count(); + let expecting = if deserialized_count == 1 { + format!("{} with 1 element", expecting) + } else { + format!("{} with {} elements", expecting, deserialized_count) + }; + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let mut index_in_seq = 0_usize; + let let_values = vars.clone().zip(fields).map(|(var, field)| { + if field.attrs.skip_deserializing() { + let default = Expr(expr_is_missing(field, cattrs)); + quote! { + let #var = #default; + } + } else { + let visit = match field.attrs.deserialize_with() { + None => { + let field_ty = field.ty; + let span = field.original.span(); + let func = + quote_spanned!(span=> _serde::de::SeqAccess::next_element::<#field_ty>); + quote!(try!(#func(&mut __seq))) + } + Some(path) => { + let (wrapper, wrapper_ty) = wrap_deserialize_field_with(params, field.ty, path); + quote!({ + #wrapper + _serde::__private::Option::map( + try!(_serde::de::SeqAccess::next_element::<#wrapper_ty>(&mut __seq)), + |__wrap| __wrap.value) + }) + } + }; + let value_if_none = match field.attrs.default() { + attr::Default::Default => quote!(_serde::__private::Default::default()), + attr::Default::Path(path) => quote!(#path()), + attr::Default::None => quote!( + return _serde::__private::Err(_serde::de::Error::invalid_length(#index_in_seq, &#expecting)); + ), + }; + let assign = quote! { + let #var = match #visit { + _serde::__private::Some(__value) => __value, + _serde::__private::None => { + #value_if_none + } + }; + }; + index_in_seq += 1; + assign + } + }); + + let mut result = if is_struct { + let names = fields.iter().map(|f| &f.member); + quote! { + #type_path { #( #names: #vars ),* } + } + } else { + quote! { + #type_path ( #(#vars),* ) + } + }; + + if params.has_getter { + let this = ¶ms.this; + result = quote! { + _serde::__private::Into::<#this>::into(#result) + }; + } + + let let_default = match cattrs.default() { + attr::Default::Default => Some(quote!( + let __default: Self::Value = _serde::__private::Default::default(); + )), + attr::Default::Path(path) => Some(quote!( + let __default: Self::Value = #path(); + )), + attr::Default::None => { + // We don't need the default value, to prevent an unused variable warning + // we'll leave the line empty. + None + } + }; + + quote_block! { + #let_default + #(#let_values)* + _serde::__private::Ok(#result) + } +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_seq_in_place( + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, + expecting: &str, +) -> Fragment { + let deserialized_count = fields + .iter() + .filter(|field| !field.attrs.skip_deserializing()) + .count(); + let expecting = if deserialized_count == 1 { + format!("{} with 1 element", expecting) + } else { + format!("{} with {} elements", expecting, deserialized_count) + }; + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let mut index_in_seq = 0usize; + let write_values = fields.iter().map(|field| { + let member = &field.member; + + if field.attrs.skip_deserializing() { + let default = Expr(expr_is_missing(field, cattrs)); + quote! { + self.place.#member = #default; + } + } else { + let value_if_none = match field.attrs.default() { + attr::Default::Default => quote!( + self.place.#member = _serde::__private::Default::default(); + ), + attr::Default::Path(path) => quote!( + self.place.#member = #path(); + ), + attr::Default::None => quote!( + return _serde::__private::Err(_serde::de::Error::invalid_length(#index_in_seq, &#expecting)); + ), + }; + let write = match field.attrs.deserialize_with() { + None => { + quote! { + if let _serde::__private::None = try!(_serde::de::SeqAccess::next_element_seed(&mut __seq, + _serde::__private::de::InPlaceSeed(&mut self.place.#member))) + { + #value_if_none + } + } + } + Some(path) => { + let (wrapper, wrapper_ty) = wrap_deserialize_field_with(params, field.ty, path); + quote!({ + #wrapper + match try!(_serde::de::SeqAccess::next_element::<#wrapper_ty>(&mut __seq)) { + _serde::__private::Some(__wrap) => { + self.place.#member = __wrap.value; + } + _serde::__private::None => { + #value_if_none + } + } + }) + } + }; + index_in_seq += 1; + write + } + }); + + let this = ¶ms.this; + let (_, ty_generics, _) = params.generics.split_for_impl(); + let let_default = match cattrs.default() { + attr::Default::Default => Some(quote!( + let __default: #this #ty_generics = _serde::__private::Default::default(); + )), + attr::Default::Path(path) => Some(quote!( + let __default: #this #ty_generics = #path(); + )), + attr::Default::None => { + // We don't need the default value, to prevent an unused variable warning + // we'll leave the line empty. + None + } + }; + + quote_block! { + #let_default + #(#write_values)* + _serde::__private::Ok(()) + } +} + +fn deserialize_newtype_struct( + type_path: &TokenStream, + params: &Parameters, + field: &Field, +) -> TokenStream { + let delife = params.borrowed.de_lifetime(); + let field_ty = field.ty; + + let value = match field.attrs.deserialize_with() { + None => { + let span = field.original.span(); + let func = quote_spanned!(span=> <#field_ty as _serde::Deserialize>::deserialize); + quote! { + try!(#func(__e)) + } + } + Some(path) => { + quote! { + try!(#path(__e)) + } + } + }; + + let mut result = quote!(#type_path(__field0)); + if params.has_getter { + let this = ¶ms.this; + result = quote! { + _serde::__private::Into::<#this>::into(#result) + }; + } + + quote! { + #[inline] + fn visit_newtype_struct<__E>(self, __e: __E) -> _serde::__private::Result<Self::Value, __E::Error> + where + __E: _serde::Deserializer<#delife>, + { + let __field0: #field_ty = #value; + _serde::__private::Ok(#result) + } + } +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_newtype_struct_in_place(params: &Parameters, field: &Field) -> TokenStream { + // We do not generate deserialize_in_place if every field has a + // deserialize_with. + assert!(field.attrs.deserialize_with().is_none()); + + let delife = params.borrowed.de_lifetime(); + + quote! { + #[inline] + fn visit_newtype_struct<__E>(self, __e: __E) -> _serde::__private::Result<Self::Value, __E::Error> + where + __E: _serde::Deserializer<#delife>, + { + _serde::Deserialize::deserialize_in_place(__e, &mut self.place.0) + } + } +} + +enum Untagged { + Yes, + No, +} + +fn deserialize_struct( + variant_ident: Option<&syn::Ident>, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, + deserializer: Option<TokenStream>, + untagged: &Untagged, +) -> Fragment { + let is_enum = variant_ident.is_some(); + + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + // If there are getters (implying private fields), construct the local type + // and use an `Into` conversion to get the remote type. If there are no + // getters then construct the target type directly. + let construct = if params.has_getter { + let local = ¶ms.local; + quote!(#local) + } else { + quote!(#this) + }; + + let type_path = match variant_ident { + Some(variant_ident) => quote!(#construct::#variant_ident), + None => construct, + }; + let expecting = match variant_ident { + Some(variant_ident) => format!("struct variant {}::{}", params.type_name(), variant_ident), + None => format!("struct {}", params.type_name()), + }; + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let visit_seq = Stmts(deserialize_seq( + &type_path, params, fields, true, cattrs, expecting, + )); + + let (field_visitor, fields_stmt, visit_map) = if cattrs.has_flatten() { + deserialize_struct_as_map_visitor(&type_path, params, fields, cattrs) + } else { + deserialize_struct_as_struct_visitor(&type_path, params, fields, cattrs) + }; + let field_visitor = Stmts(field_visitor); + let fields_stmt = fields_stmt.map(Stmts); + let visit_map = Stmts(visit_map); + + let visitor_expr = quote! { + __Visitor { + marker: _serde::__private::PhantomData::<#this #ty_generics>, + lifetime: _serde::__private::PhantomData, + } + }; + let dispatch = if let Some(deserializer) = deserializer { + quote! { + _serde::Deserializer::deserialize_any(#deserializer, #visitor_expr) + } + } else if is_enum && cattrs.has_flatten() { + quote! { + _serde::de::VariantAccess::newtype_variant_seed(__variant, #visitor_expr) + } + } else if is_enum { + quote! { + _serde::de::VariantAccess::struct_variant(__variant, FIELDS, #visitor_expr) + } + } else if cattrs.has_flatten() { + quote! { + _serde::Deserializer::deserialize_map(__deserializer, #visitor_expr) + } + } else { + let type_name = cattrs.name().deserialize_name(); + quote! { + _serde::Deserializer::deserialize_struct(__deserializer, #type_name, FIELDS, #visitor_expr) + } + }; + + let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing()); + let visitor_var = if all_skipped { + quote!(_) + } else { + quote!(mut __seq) + }; + + // untagged struct variants do not get a visit_seq method. The same applies to + // structs that only have a map representation. + let visit_seq = match *untagged { + Untagged::No if !cattrs.has_flatten() => Some(quote! { + #[inline] + fn visit_seq<__A>(self, #visitor_var: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::SeqAccess<#delife>, + { + #visit_seq + } + }), + _ => None, + }; + + let visitor_seed = if is_enum && cattrs.has_flatten() { + Some(quote! { + impl #de_impl_generics _serde::de::DeserializeSeed<#delife> for __Visitor #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + fn deserialize<__D>(self, __deserializer: __D) -> _serde::__private::Result<Self::Value, __D::Error> + where + __D: _serde::Deserializer<'de>, + { + _serde::Deserializer::deserialize_map(__deserializer, self) + } + } + }) + } else { + None + }; + + quote_block! { + #field_visitor + + struct __Visitor #de_impl_generics #where_clause { + marker: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + #visit_seq + + #[inline] + fn visit_map<__A>(self, mut __map: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::MapAccess<#delife>, + { + #visit_map + } + } + + #visitor_seed + + #fields_stmt + + #dispatch + } +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_struct_in_place( + variant_ident: Option<syn::Ident>, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, + deserializer: Option<TokenStream>, +) -> Option<Fragment> { + let is_enum = variant_ident.is_some(); + + // for now we do not support in_place deserialization for structs that + // are represented as map. + if cattrs.has_flatten() { + return None; + } + + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + let expecting = match variant_ident { + Some(variant_ident) => format!("struct variant {}::{}", params.type_name(), variant_ident), + None => format!("struct {}", params.type_name()), + }; + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let visit_seq = Stmts(deserialize_seq_in_place(params, fields, cattrs, expecting)); + + let (field_visitor, fields_stmt, visit_map) = + deserialize_struct_as_struct_in_place_visitor(params, fields, cattrs); + + let field_visitor = Stmts(field_visitor); + let fields_stmt = Stmts(fields_stmt); + let visit_map = Stmts(visit_map); + + let visitor_expr = quote! { + __Visitor { + place: __place, + lifetime: _serde::__private::PhantomData, + } + }; + let dispatch = if let Some(deserializer) = deserializer { + quote! { + _serde::Deserializer::deserialize_any(#deserializer, #visitor_expr) + } + } else if is_enum { + quote! { + _serde::de::VariantAccess::struct_variant(__variant, FIELDS, #visitor_expr) + } + } else { + let type_name = cattrs.name().deserialize_name(); + quote! { + _serde::Deserializer::deserialize_struct(__deserializer, #type_name, FIELDS, #visitor_expr) + } + }; + + let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing()); + let visitor_var = if all_skipped { + quote!(_) + } else { + quote!(mut __seq) + }; + + let visit_seq = quote! { + #[inline] + fn visit_seq<__A>(self, #visitor_var: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::SeqAccess<#delife>, + { + #visit_seq + } + }; + + let in_place_impl_generics = de_impl_generics.in_place(); + let in_place_ty_generics = de_ty_generics.in_place(); + let place_life = place_lifetime(); + + Some(quote_block! { + #field_visitor + + struct __Visitor #in_place_impl_generics #where_clause { + place: &#place_life mut #this #ty_generics, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #in_place_impl_generics _serde::de::Visitor<#delife> for __Visitor #in_place_ty_generics #where_clause { + type Value = (); + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + #visit_seq + + #[inline] + fn visit_map<__A>(self, mut __map: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::MapAccess<#delife>, + { + #visit_map + } + } + + #fields_stmt + + #dispatch + }) +} + +fn deserialize_enum( + params: &Parameters, + variants: &[Variant], + cattrs: &attr::Container, +) -> Fragment { + match cattrs.tag() { + attr::TagType::External => deserialize_externally_tagged_enum(params, variants, cattrs), + attr::TagType::Internal { tag } => { + deserialize_internally_tagged_enum(params, variants, cattrs, tag) + } + attr::TagType::Adjacent { tag, content } => { + deserialize_adjacently_tagged_enum(params, variants, cattrs, tag, content) + } + attr::TagType::None => deserialize_untagged_enum(params, variants, cattrs), + } +} + +fn prepare_enum_variant_enum( + variants: &[Variant], + cattrs: &attr::Container, +) -> (TokenStream, Stmts) { + let mut deserialized_variants = variants + .iter() + .enumerate() + .filter(|&(_, variant)| !variant.attrs.skip_deserializing()); + + let variant_names_idents: Vec<_> = deserialized_variants + .clone() + .map(|(i, variant)| { + ( + variant.attrs.name().deserialize_name(), + field_i(i), + variant.attrs.aliases(), + ) + }) + .collect(); + + let other_idx = deserialized_variants.position(|(_, variant)| variant.attrs.other()); + + let variants_stmt = { + let variant_names = variant_names_idents.iter().map(|(name, _, _)| name); + quote! { + const VARIANTS: &'static [&'static str] = &[ #(#variant_names),* ]; + } + }; + + let variant_visitor = Stmts(deserialize_generated_identifier( + &variant_names_idents, + cattrs, + true, + other_idx, + )); + + (variants_stmt, variant_visitor) +} + +fn deserialize_externally_tagged_enum( + params: &Parameters, + variants: &[Variant], + cattrs: &attr::Container, +) -> Fragment { + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + let type_name = cattrs.name().deserialize_name(); + let expecting = format!("enum {}", params.type_name()); + let expecting = cattrs.expecting().unwrap_or(&expecting); + + let (variants_stmt, variant_visitor) = prepare_enum_variant_enum(variants, cattrs); + + // Match arms to extract a variant from a string + let variant_arms = variants + .iter() + .enumerate() + .filter(|&(_, variant)| !variant.attrs.skip_deserializing()) + .map(|(i, variant)| { + let variant_name = field_i(i); + + let block = Match(deserialize_externally_tagged_variant( + params, variant, cattrs, + )); + + quote! { + (__Field::#variant_name, __variant) => #block + } + }); + + let all_skipped = variants + .iter() + .all(|variant| variant.attrs.skip_deserializing()); + let match_variant = if all_skipped { + // This is an empty enum like `enum Impossible {}` or an enum in which + // all variants have `#[serde(skip_deserializing)]`. + quote! { + // FIXME: Once we drop support for Rust 1.15: + // let _serde::__private::Err(__err) = _serde::de::EnumAccess::variant::<__Field>(__data); + // _serde::__private::Err(__err) + _serde::__private::Result::map( + _serde::de::EnumAccess::variant::<__Field>(__data), + |(__impossible, _)| match __impossible {}) + } + } else { + quote! { + match try!(_serde::de::EnumAccess::variant(__data)) { + #(#variant_arms)* + } + } + }; + + quote_block! { + #variant_visitor + + struct __Visitor #de_impl_generics #where_clause { + marker: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + fn visit_enum<__A>(self, __data: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::EnumAccess<#delife>, + { + #match_variant + } + } + + #variants_stmt + + _serde::Deserializer::deserialize_enum( + __deserializer, + #type_name, + VARIANTS, + __Visitor { + marker: _serde::__private::PhantomData::<#this #ty_generics>, + lifetime: _serde::__private::PhantomData, + }, + ) + } +} + +fn deserialize_internally_tagged_enum( + params: &Parameters, + variants: &[Variant], + cattrs: &attr::Container, + tag: &str, +) -> Fragment { + let (variants_stmt, variant_visitor) = prepare_enum_variant_enum(variants, cattrs); + + // Match arms to extract a variant from a string + let variant_arms = variants + .iter() + .enumerate() + .filter(|&(_, variant)| !variant.attrs.skip_deserializing()) + .map(|(i, variant)| { + let variant_name = field_i(i); + + let block = Match(deserialize_internally_tagged_variant( + params, + variant, + cattrs, + quote! { + _serde::__private::de::ContentDeserializer::<__D::Error>::new(__tagged.content) + }, + )); + + quote! { + __Field::#variant_name => #block + } + }); + + let expecting = format!("internally tagged enum {}", params.type_name()); + let expecting = cattrs.expecting().unwrap_or(&expecting); + + quote_block! { + #variant_visitor + + #variants_stmt + + let __tagged = try!(_serde::Deserializer::deserialize_any( + __deserializer, + _serde::__private::de::TaggedContentVisitor::<__Field>::new(#tag, #expecting))); + + match __tagged.tag { + #(#variant_arms)* + } + } +} + +fn deserialize_adjacently_tagged_enum( + params: &Parameters, + variants: &[Variant], + cattrs: &attr::Container, + tag: &str, + content: &str, +) -> Fragment { + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + let (variants_stmt, variant_visitor) = prepare_enum_variant_enum(variants, cattrs); + + let variant_arms: &Vec<_> = &variants + .iter() + .enumerate() + .filter(|&(_, variant)| !variant.attrs.skip_deserializing()) + .map(|(i, variant)| { + let variant_index = field_i(i); + + let block = Match(deserialize_untagged_variant( + params, + variant, + cattrs, + quote!(__deserializer), + )); + + quote! { + __Field::#variant_index => #block + } + }) + .collect(); + + let expecting = format!("adjacently tagged enum {}", params.type_name()); + let expecting = cattrs.expecting().unwrap_or(&expecting); + let type_name = cattrs.name().deserialize_name(); + let deny_unknown_fields = cattrs.deny_unknown_fields(); + + // If unknown fields are allowed, we pick the visitor that can step over + // those. Otherwise we pick the visitor that fails on unknown keys. + let field_visitor_ty = if deny_unknown_fields { + quote! { _serde::__private::de::TagOrContentFieldVisitor } + } else { + quote! { _serde::__private::de::TagContentOtherFieldVisitor } + }; + + let tag_or_content = quote! { + #field_visitor_ty { + tag: #tag, + content: #content, + } + }; + + let mut missing_content = quote! { + _serde::__private::Err(<__A::Error as _serde::de::Error>::missing_field(#content)) + }; + let mut missing_content_fallthrough = quote!(); + let missing_content_arms = variants + .iter() + .enumerate() + .filter(|&(_, variant)| !variant.attrs.skip_deserializing()) + .filter_map(|(i, variant)| { + let variant_index = field_i(i); + let variant_ident = &variant.ident; + + let arm = match variant.style { + Style::Unit => quote! { + _serde::__private::Ok(#this::#variant_ident) + }, + Style::Newtype if variant.attrs.deserialize_with().is_none() => { + let span = variant.original.span(); + let func = quote_spanned!(span=> _serde::__private::de::missing_field); + quote! { + #func(#content).map(#this::#variant_ident) + } + } + _ => { + missing_content_fallthrough = quote!(_ => #missing_content); + return None; + } + }; + Some(quote! { + __Field::#variant_index => #arm, + }) + }) + .collect::<Vec<_>>(); + if !missing_content_arms.is_empty() { + missing_content = quote! { + match __field { + #(#missing_content_arms)* + #missing_content_fallthrough + } + }; + } + + // Advance the map by one key, returning early in case of error. + let next_key = quote! { + try!(_serde::de::MapAccess::next_key_seed(&mut __map, #tag_or_content)) + }; + + // When allowing unknown fields, we want to transparently step through keys + // we don't care about until we find `tag`, `content`, or run out of keys. + let next_relevant_key = if deny_unknown_fields { + next_key + } else { + quote!({ + let mut __rk : _serde::__private::Option<_serde::__private::de::TagOrContentField> = _serde::__private::None; + while let _serde::__private::Some(__k) = #next_key { + match __k { + _serde::__private::de::TagContentOtherField::Other => { + let _ = try!(_serde::de::MapAccess::next_value::<_serde::de::IgnoredAny>(&mut __map)); + continue; + }, + _serde::__private::de::TagContentOtherField::Tag => { + __rk = _serde::__private::Some(_serde::__private::de::TagOrContentField::Tag); + break; + } + _serde::__private::de::TagContentOtherField::Content => { + __rk = _serde::__private::Some(_serde::__private::de::TagOrContentField::Content); + break; + } + } + } + + __rk + }) + }; + + // Step through remaining keys, looking for duplicates of previously-seen + // keys. When unknown fields are denied, any key that isn't a duplicate will + // at this point immediately produce an error. + let visit_remaining_keys = quote! { + match #next_relevant_key { + _serde::__private::Some(_serde::__private::de::TagOrContentField::Tag) => { + _serde::__private::Err(<__A::Error as _serde::de::Error>::duplicate_field(#tag)) + } + _serde::__private::Some(_serde::__private::de::TagOrContentField::Content) => { + _serde::__private::Err(<__A::Error as _serde::de::Error>::duplicate_field(#content)) + } + _serde::__private::None => _serde::__private::Ok(__ret), + } + }; + + let finish_content_then_tag = if variant_arms.is_empty() { + quote! { + match try!(_serde::de::MapAccess::next_value::<__Field>(&mut __map)) {} + } + } else { + quote! { + let __ret = try!(match try!(_serde::de::MapAccess::next_value(&mut __map)) { + // Deserialize the buffered content now that we know the variant. + #(#variant_arms)* + }); + // Visit remaining keys, looking for duplicates. + #visit_remaining_keys + } + }; + + quote_block! { + #variant_visitor + + #variants_stmt + + struct __Seed #de_impl_generics #where_clause { + field: __Field, + marker: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::de::DeserializeSeed<#delife> for __Seed #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + fn deserialize<__D>(self, __deserializer: __D) -> _serde::__private::Result<Self::Value, __D::Error> + where + __D: _serde::Deserializer<#delife>, + { + match self.field { + #(#variant_arms)* + } + } + } + + struct __Visitor #de_impl_generics #where_clause { + marker: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + fn visit_map<__A>(self, mut __map: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::MapAccess<#delife>, + { + // Visit the first relevant key. + match #next_relevant_key { + // First key is the tag. + _serde::__private::Some(_serde::__private::de::TagOrContentField::Tag) => { + // Parse the tag. + let __field = try!(_serde::de::MapAccess::next_value(&mut __map)); + // Visit the second key. + match #next_relevant_key { + // Second key is a duplicate of the tag. + _serde::__private::Some(_serde::__private::de::TagOrContentField::Tag) => { + _serde::__private::Err(<__A::Error as _serde::de::Error>::duplicate_field(#tag)) + } + // Second key is the content. + _serde::__private::Some(_serde::__private::de::TagOrContentField::Content) => { + let __ret = try!(_serde::de::MapAccess::next_value_seed(&mut __map, + __Seed { + field: __field, + marker: _serde::__private::PhantomData, + lifetime: _serde::__private::PhantomData, + })); + // Visit remaining keys, looking for duplicates. + #visit_remaining_keys + } + // There is no second key; might be okay if the we have a unit variant. + _serde::__private::None => #missing_content + } + } + // First key is the content. + _serde::__private::Some(_serde::__private::de::TagOrContentField::Content) => { + // Buffer up the content. + let __content = try!(_serde::de::MapAccess::next_value::<_serde::__private::de::Content>(&mut __map)); + // Visit the second key. + match #next_relevant_key { + // Second key is the tag. + _serde::__private::Some(_serde::__private::de::TagOrContentField::Tag) => { + let __deserializer = _serde::__private::de::ContentDeserializer::<__A::Error>::new(__content); + #finish_content_then_tag + } + // Second key is a duplicate of the content. + _serde::__private::Some(_serde::__private::de::TagOrContentField::Content) => { + _serde::__private::Err(<__A::Error as _serde::de::Error>::duplicate_field(#content)) + } + // There is no second key. + _serde::__private::None => { + _serde::__private::Err(<__A::Error as _serde::de::Error>::missing_field(#tag)) + } + } + } + // There is no first key. + _serde::__private::None => { + _serde::__private::Err(<__A::Error as _serde::de::Error>::missing_field(#tag)) + } + } + } + + fn visit_seq<__A>(self, mut __seq: __A) -> _serde::__private::Result<Self::Value, __A::Error> + where + __A: _serde::de::SeqAccess<#delife>, + { + // Visit the first element - the tag. + match try!(_serde::de::SeqAccess::next_element(&mut __seq)) { + _serde::__private::Some(__field) => { + // Visit the second element - the content. + match try!(_serde::de::SeqAccess::next_element_seed( + &mut __seq, + __Seed { + field: __field, + marker: _serde::__private::PhantomData, + lifetime: _serde::__private::PhantomData, + }, + )) { + _serde::__private::Some(__ret) => _serde::__private::Ok(__ret), + // There is no second element. + _serde::__private::None => { + _serde::__private::Err(_serde::de::Error::invalid_length(1, &self)) + } + } + } + // There is no first element. + _serde::__private::None => { + _serde::__private::Err(_serde::de::Error::invalid_length(0, &self)) + } + } + } + } + + const FIELDS: &'static [&'static str] = &[#tag, #content]; + _serde::Deserializer::deserialize_struct( + __deserializer, + #type_name, + FIELDS, + __Visitor { + marker: _serde::__private::PhantomData::<#this #ty_generics>, + lifetime: _serde::__private::PhantomData, + }, + ) + } +} + +fn deserialize_untagged_enum( + params: &Parameters, + variants: &[Variant], + cattrs: &attr::Container, +) -> Fragment { + let attempts = variants + .iter() + .filter(|variant| !variant.attrs.skip_deserializing()) + .map(|variant| { + Expr(deserialize_untagged_variant( + params, + variant, + cattrs, + quote!( + _serde::__private::de::ContentRefDeserializer::<__D::Error>::new(&__content) + ), + )) + }); + + // TODO this message could be better by saving the errors from the failed + // attempts. The heuristic used by TOML was to count the number of fields + // processed before an error, and use the error that happened after the + // largest number of fields. I'm not sure I like that. Maybe it would be + // better to save all the errors and combine them into one message that + // explains why none of the variants matched. + let fallthrough_msg = format!( + "data did not match any variant of untagged enum {}", + params.type_name() + ); + let fallthrough_msg = cattrs.expecting().unwrap_or(&fallthrough_msg); + + quote_block! { + let __content = try!(<_serde::__private::de::Content as _serde::Deserialize>::deserialize(__deserializer)); + + #( + if let _serde::__private::Ok(__ok) = #attempts { + return _serde::__private::Ok(__ok); + } + )* + + _serde::__private::Err(_serde::de::Error::custom(#fallthrough_msg)) + } +} + +fn deserialize_externally_tagged_variant( + params: &Parameters, + variant: &Variant, + cattrs: &attr::Container, +) -> Fragment { + if let Some(path) = variant.attrs.deserialize_with() { + let (wrapper, wrapper_ty, unwrap_fn) = wrap_deserialize_variant_with(params, variant, path); + return quote_block! { + #wrapper + _serde::__private::Result::map( + _serde::de::VariantAccess::newtype_variant::<#wrapper_ty>(__variant), #unwrap_fn) + }; + } + + let variant_ident = &variant.ident; + + match variant.style { + Style::Unit => { + let this = ¶ms.this; + quote_block! { + try!(_serde::de::VariantAccess::unit_variant(__variant)); + _serde::__private::Ok(#this::#variant_ident) + } + } + Style::Newtype => deserialize_externally_tagged_newtype_variant( + variant_ident, + params, + &variant.fields[0], + cattrs, + ), + Style::Tuple => { + deserialize_tuple(Some(variant_ident), params, &variant.fields, cattrs, None) + } + Style::Struct => deserialize_struct( + Some(variant_ident), + params, + &variant.fields, + cattrs, + None, + &Untagged::No, + ), + } +} + +// Generates significant part of the visit_seq and visit_map bodies of visitors +// for the variants of internally tagged enum. +fn deserialize_internally_tagged_variant( + params: &Parameters, + variant: &Variant, + cattrs: &attr::Container, + deserializer: TokenStream, +) -> Fragment { + if variant.attrs.deserialize_with().is_some() { + return deserialize_untagged_variant(params, variant, cattrs, deserializer); + } + + let variant_ident = &variant.ident; + + match effective_style(variant) { + Style::Unit => { + let this = ¶ms.this; + let type_name = params.type_name(); + let variant_name = variant.ident.to_string(); + let default = variant.fields.get(0).map(|field| { + let default = Expr(expr_is_missing(field, cattrs)); + quote!((#default)) + }); + quote_block! { + try!(_serde::Deserializer::deserialize_any(#deserializer, _serde::__private::de::InternallyTaggedUnitVisitor::new(#type_name, #variant_name))); + _serde::__private::Ok(#this::#variant_ident #default) + } + } + Style::Newtype => deserialize_untagged_newtype_variant( + variant_ident, + params, + &variant.fields[0], + &deserializer, + ), + Style::Struct => deserialize_struct( + Some(variant_ident), + params, + &variant.fields, + cattrs, + Some(deserializer), + &Untagged::No, + ), + Style::Tuple => unreachable!("checked in serde_derive_internals"), + } +} + +fn deserialize_untagged_variant( + params: &Parameters, + variant: &Variant, + cattrs: &attr::Container, + deserializer: TokenStream, +) -> Fragment { + if let Some(path) = variant.attrs.deserialize_with() { + let unwrap_fn = unwrap_to_variant_closure(params, variant, false); + return quote_block! { + _serde::__private::Result::map(#path(#deserializer), #unwrap_fn) + }; + } + + let variant_ident = &variant.ident; + + match effective_style(variant) { + Style::Unit => { + let this = ¶ms.this; + let type_name = params.type_name(); + let variant_name = variant.ident.to_string(); + let default = variant.fields.get(0).map(|field| { + let default = Expr(expr_is_missing(field, cattrs)); + quote!((#default)) + }); + quote_expr! { + match _serde::Deserializer::deserialize_any( + #deserializer, + _serde::__private::de::UntaggedUnitVisitor::new(#type_name, #variant_name) + ) { + _serde::__private::Ok(()) => _serde::__private::Ok(#this::#variant_ident #default), + _serde::__private::Err(__err) => _serde::__private::Err(__err), + } + } + } + Style::Newtype => deserialize_untagged_newtype_variant( + variant_ident, + params, + &variant.fields[0], + &deserializer, + ), + Style::Tuple => deserialize_tuple( + Some(variant_ident), + params, + &variant.fields, + cattrs, + Some(deserializer), + ), + Style::Struct => deserialize_struct( + Some(variant_ident), + params, + &variant.fields, + cattrs, + Some(deserializer), + &Untagged::Yes, + ), + } +} + +fn deserialize_externally_tagged_newtype_variant( + variant_ident: &syn::Ident, + params: &Parameters, + field: &Field, + cattrs: &attr::Container, +) -> Fragment { + let this = ¶ms.this; + + if field.attrs.skip_deserializing() { + let this = ¶ms.this; + let default = Expr(expr_is_missing(field, cattrs)); + return quote_block! { + try!(_serde::de::VariantAccess::unit_variant(__variant)); + _serde::__private::Ok(#this::#variant_ident(#default)) + }; + } + + match field.attrs.deserialize_with() { + None => { + let field_ty = field.ty; + let span = field.original.span(); + let func = + quote_spanned!(span=> _serde::de::VariantAccess::newtype_variant::<#field_ty>); + quote_expr! { + _serde::__private::Result::map(#func(__variant), #this::#variant_ident) + } + } + Some(path) => { + let (wrapper, wrapper_ty) = wrap_deserialize_field_with(params, field.ty, path); + quote_block! { + #wrapper + _serde::__private::Result::map( + _serde::de::VariantAccess::newtype_variant::<#wrapper_ty>(__variant), + |__wrapper| #this::#variant_ident(__wrapper.value)) + } + } + } +} + +fn deserialize_untagged_newtype_variant( + variant_ident: &syn::Ident, + params: &Parameters, + field: &Field, + deserializer: &TokenStream, +) -> Fragment { + let this = ¶ms.this; + let field_ty = field.ty; + match field.attrs.deserialize_with() { + None => { + let span = field.original.span(); + let func = quote_spanned!(span=> <#field_ty as _serde::Deserialize>::deserialize); + quote_expr! { + _serde::__private::Result::map(#func(#deserializer), #this::#variant_ident) + } + } + Some(path) => { + quote_block! { + let __value: _serde::__private::Result<#field_ty, _> = #path(#deserializer); + _serde::__private::Result::map(__value, #this::#variant_ident) + } + } + } +} + +fn deserialize_generated_identifier( + fields: &[(String, Ident, Vec<String>)], + cattrs: &attr::Container, + is_variant: bool, + other_idx: Option<usize>, +) -> Fragment { + let this = quote!(__Field); + let field_idents: &Vec<_> = &fields.iter().map(|(_, ident, _)| ident).collect(); + + let (ignore_variant, fallthrough) = if !is_variant && cattrs.has_flatten() { + let ignore_variant = quote!(__other(_serde::__private::de::Content<'de>),); + let fallthrough = quote!(_serde::__private::Ok(__Field::__other(__value))); + (Some(ignore_variant), Some(fallthrough)) + } else if let Some(other_idx) = other_idx { + let ignore_variant = fields[other_idx].1.clone(); + let fallthrough = quote!(_serde::__private::Ok(__Field::#ignore_variant)); + (None, Some(fallthrough)) + } else if is_variant || cattrs.deny_unknown_fields() { + (None, None) + } else { + let ignore_variant = quote!(__ignore,); + let fallthrough = quote!(_serde::__private::Ok(__Field::__ignore)); + (Some(ignore_variant), Some(fallthrough)) + }; + + let visitor_impl = Stmts(deserialize_identifier( + &this, + fields, + is_variant, + fallthrough, + None, + !is_variant && cattrs.has_flatten(), + None, + )); + + let lifetime = if !is_variant && cattrs.has_flatten() { + Some(quote!(<'de>)) + } else { + None + }; + + quote_block! { + #[allow(non_camel_case_types)] + enum __Field #lifetime { + #(#field_idents,)* + #ignore_variant + } + + struct __FieldVisitor; + + impl<'de> _serde::de::Visitor<'de> for __FieldVisitor { + type Value = __Field #lifetime; + + #visitor_impl + } + + impl<'de> _serde::Deserialize<'de> for __Field #lifetime { + #[inline] + fn deserialize<__D>(__deserializer: __D) -> _serde::__private::Result<Self, __D::Error> + where + __D: _serde::Deserializer<'de>, + { + _serde::Deserializer::deserialize_identifier(__deserializer, __FieldVisitor) + } + } + } +} + +// Generates `Deserialize::deserialize` body for an enum with +// `serde(field_identifier)` or `serde(variant_identifier)` attribute. +fn deserialize_custom_identifier( + params: &Parameters, + variants: &[Variant], + cattrs: &attr::Container, +) -> Fragment { + let is_variant = match cattrs.identifier() { + attr::Identifier::Variant => true, + attr::Identifier::Field => false, + attr::Identifier::No => unreachable!(), + }; + + let this = ¶ms.this; + let this = quote!(#this); + + let (ordinary, fallthrough, fallthrough_borrowed) = if let Some(last) = variants.last() { + let last_ident = &last.ident; + if last.attrs.other() { + // Process `serde(other)` attribute. It would always be found on the + // last variant (checked in `check_identifier`), so all preceding + // are ordinary variants. + let ordinary = &variants[..variants.len() - 1]; + let fallthrough = quote!(_serde::__private::Ok(#this::#last_ident)); + (ordinary, Some(fallthrough), None) + } else if let Style::Newtype = last.style { + let ordinary = &variants[..variants.len() - 1]; + let fallthrough = |value| { + quote! { + _serde::__private::Result::map( + _serde::Deserialize::deserialize( + _serde::__private::de::IdentifierDeserializer::from(#value) + ), + #this::#last_ident) + } + }; + ( + ordinary, + Some(fallthrough(quote!(__value))), + Some(fallthrough(quote!(_serde::__private::de::Borrowed( + __value + )))), + ) + } else { + (variants, None, None) + } + } else { + (variants, None, None) + }; + + let names_idents: Vec<_> = ordinary + .iter() + .map(|variant| { + ( + variant.attrs.name().deserialize_name(), + variant.ident.clone(), + variant.attrs.aliases(), + ) + }) + .collect(); + + let names = names_idents.iter().map(|(name, _, _)| name); + + let names_const = if fallthrough.is_some() { + None + } else if is_variant { + let variants = quote! { + const VARIANTS: &'static [&'static str] = &[ #(#names),* ]; + }; + Some(variants) + } else { + let fields = quote! { + const FIELDS: &'static [&'static str] = &[ #(#names),* ]; + }; + Some(fields) + }; + + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + let visitor_impl = Stmts(deserialize_identifier( + &this, + &names_idents, + is_variant, + fallthrough, + fallthrough_borrowed, + false, + cattrs.expecting(), + )); + + quote_block! { + #names_const + + struct __FieldVisitor #de_impl_generics #where_clause { + marker: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::de::Visitor<#delife> for __FieldVisitor #de_ty_generics #where_clause { + type Value = #this #ty_generics; + + #visitor_impl + } + + let __visitor = __FieldVisitor { + marker: _serde::__private::PhantomData::<#this #ty_generics>, + lifetime: _serde::__private::PhantomData, + }; + _serde::Deserializer::deserialize_identifier(__deserializer, __visitor) + } +} + +fn deserialize_identifier( + this: &TokenStream, + fields: &[(String, Ident, Vec<String>)], + is_variant: bool, + fallthrough: Option<TokenStream>, + fallthrough_borrowed: Option<TokenStream>, + collect_other_fields: bool, + expecting: Option<&str>, +) -> Fragment { + let mut flat_fields = Vec::new(); + for (_, ident, aliases) in fields { + flat_fields.extend(aliases.iter().map(|alias| (alias, ident))); + } + + let field_strs: &Vec<_> = &flat_fields.iter().map(|(name, _)| name).collect(); + let field_bytes: &Vec<_> = &flat_fields + .iter() + .map(|(name, _)| Literal::byte_string(name.as_bytes())) + .collect(); + + let constructors: &Vec<_> = &flat_fields + .iter() + .map(|(_, ident)| quote!(#this::#ident)) + .collect(); + let main_constructors: &Vec<_> = &fields + .iter() + .map(|(_, ident, _)| quote!(#this::#ident)) + .collect(); + + let expecting = expecting.unwrap_or(if is_variant { + "variant identifier" + } else { + "field identifier" + }); + + let index_expecting = if is_variant { "variant" } else { "field" }; + + let bytes_to_str = if fallthrough.is_some() || collect_other_fields { + None + } else { + Some(quote! { + let __value = &_serde::__private::from_utf8_lossy(__value); + }) + }; + + let ( + value_as_str_content, + value_as_borrowed_str_content, + value_as_bytes_content, + value_as_borrowed_bytes_content, + ) = if collect_other_fields { + ( + Some(quote! { + let __value = _serde::__private::de::Content::String(_serde::__private::ToString::to_string(__value)); + }), + Some(quote! { + let __value = _serde::__private::de::Content::Str(__value); + }), + Some(quote! { + let __value = _serde::__private::de::Content::ByteBuf(__value.to_vec()); + }), + Some(quote! { + let __value = _serde::__private::de::Content::Bytes(__value); + }), + ) + } else { + (None, None, None, None) + }; + + let fallthrough_arm_tokens; + let fallthrough_arm = if let Some(fallthrough) = &fallthrough { + fallthrough + } else if is_variant { + fallthrough_arm_tokens = quote! { + _serde::__private::Err(_serde::de::Error::unknown_variant(__value, VARIANTS)) + }; + &fallthrough_arm_tokens + } else { + fallthrough_arm_tokens = quote! { + _serde::__private::Err(_serde::de::Error::unknown_field(__value, FIELDS)) + }; + &fallthrough_arm_tokens + }; + + let u64_fallthrough_arm_tokens; + let u64_fallthrough_arm = if let Some(fallthrough) = &fallthrough { + fallthrough + } else { + let fallthrough_msg = format!("{} index 0 <= i < {}", index_expecting, fields.len()); + u64_fallthrough_arm_tokens = quote! { + _serde::__private::Err(_serde::de::Error::invalid_value( + _serde::de::Unexpected::Unsigned(__value), + &#fallthrough_msg, + )) + }; + &u64_fallthrough_arm_tokens + }; + + let variant_indices = 0_u64..; + let visit_other = if collect_other_fields { + quote! { + fn visit_bool<__E>(self, __value: bool) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::Bool(__value))) + } + + fn visit_i8<__E>(self, __value: i8) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::I8(__value))) + } + + fn visit_i16<__E>(self, __value: i16) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::I16(__value))) + } + + fn visit_i32<__E>(self, __value: i32) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::I32(__value))) + } + + fn visit_i64<__E>(self, __value: i64) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::I64(__value))) + } + + fn visit_u8<__E>(self, __value: u8) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::U8(__value))) + } + + fn visit_u16<__E>(self, __value: u16) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::U16(__value))) + } + + fn visit_u32<__E>(self, __value: u32) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::U32(__value))) + } + + fn visit_u64<__E>(self, __value: u64) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::U64(__value))) + } + + fn visit_f32<__E>(self, __value: f32) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::F32(__value))) + } + + fn visit_f64<__E>(self, __value: f64) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::F64(__value))) + } + + fn visit_char<__E>(self, __value: char) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::Char(__value))) + } + + fn visit_unit<__E>(self) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + _serde::__private::Ok(__Field::__other(_serde::__private::de::Content::Unit)) + } + } + } else { + quote! { + fn visit_u64<__E>(self, __value: u64) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + match __value { + #( + #variant_indices => _serde::__private::Ok(#main_constructors), + )* + _ => #u64_fallthrough_arm, + } + } + } + }; + + let visit_borrowed = if fallthrough_borrowed.is_some() || collect_other_fields { + let fallthrough_borrowed_arm = fallthrough_borrowed.as_ref().unwrap_or(fallthrough_arm); + Some(quote! { + fn visit_borrowed_str<__E>(self, __value: &'de str) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + match __value { + #( + #field_strs => _serde::__private::Ok(#constructors), + )* + _ => { + #value_as_borrowed_str_content + #fallthrough_borrowed_arm + } + } + } + + fn visit_borrowed_bytes<__E>(self, __value: &'de [u8]) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + match __value { + #( + #field_bytes => _serde::__private::Ok(#constructors), + )* + _ => { + #bytes_to_str + #value_as_borrowed_bytes_content + #fallthrough_borrowed_arm + } + } + } + }) + } else { + None + }; + + quote_block! { + fn expecting(&self, __formatter: &mut _serde::__private::Formatter) -> _serde::__private::fmt::Result { + _serde::__private::Formatter::write_str(__formatter, #expecting) + } + + #visit_other + + fn visit_str<__E>(self, __value: &str) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + match __value { + #( + #field_strs => _serde::__private::Ok(#constructors), + )* + _ => { + #value_as_str_content + #fallthrough_arm + } + } + } + + fn visit_bytes<__E>(self, __value: &[u8]) -> _serde::__private::Result<Self::Value, __E> + where + __E: _serde::de::Error, + { + match __value { + #( + #field_bytes => _serde::__private::Ok(#constructors), + )* + _ => { + #bytes_to_str + #value_as_bytes_content + #fallthrough_arm + } + } + } + + #visit_borrowed + } +} + +fn deserialize_struct_as_struct_visitor( + struct_path: &TokenStream, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> (Fragment, Option<Fragment>, Fragment) { + assert!(!cattrs.has_flatten()); + + let field_names_idents: Vec<_> = fields + .iter() + .enumerate() + .filter(|&(_, field)| !field.attrs.skip_deserializing()) + .map(|(i, field)| { + ( + field.attrs.name().deserialize_name(), + field_i(i), + field.attrs.aliases(), + ) + }) + .collect(); + + let fields_stmt = { + let field_names = field_names_idents.iter().map(|(name, _, _)| name); + quote_block! { + const FIELDS: &'static [&'static str] = &[ #(#field_names),* ]; + } + }; + + let field_visitor = deserialize_generated_identifier(&field_names_idents, cattrs, false, None); + + let visit_map = deserialize_map(struct_path, params, fields, cattrs); + + (field_visitor, Some(fields_stmt), visit_map) +} + +fn deserialize_struct_as_map_visitor( + struct_path: &TokenStream, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> (Fragment, Option<Fragment>, Fragment) { + let field_names_idents: Vec<_> = fields + .iter() + .enumerate() + .filter(|&(_, field)| !field.attrs.skip_deserializing() && !field.attrs.flatten()) + .map(|(i, field)| { + ( + field.attrs.name().deserialize_name(), + field_i(i), + field.attrs.aliases(), + ) + }) + .collect(); + + let field_visitor = deserialize_generated_identifier(&field_names_idents, cattrs, false, None); + + let visit_map = deserialize_map(struct_path, params, fields, cattrs); + + (field_visitor, None, visit_map) +} + +fn deserialize_map( + struct_path: &TokenStream, + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> Fragment { + // Create the field names for the fields. + let fields_names: Vec<_> = fields + .iter() + .enumerate() + .map(|(i, field)| (field, field_i(i))) + .collect(); + + // Declare each field that will be deserialized. + let let_values = fields_names + .iter() + .filter(|&&(field, _)| !field.attrs.skip_deserializing() && !field.attrs.flatten()) + .map(|(field, name)| { + let field_ty = field.ty; + quote! { + let mut #name: _serde::__private::Option<#field_ty> = _serde::__private::None; + } + }); + + // Collect contents for flatten fields into a buffer + let let_collect = if cattrs.has_flatten() { + Some(quote! { + let mut __collect = _serde::__private::Vec::<_serde::__private::Option<( + _serde::__private::de::Content, + _serde::__private::de::Content + )>>::new(); + }) + } else { + None + }; + + // Match arms to extract a value for a field. + let value_arms = fields_names + .iter() + .filter(|&&(field, _)| !field.attrs.skip_deserializing() && !field.attrs.flatten()) + .map(|(field, name)| { + let deser_name = field.attrs.name().deserialize_name(); + + let visit = match field.attrs.deserialize_with() { + None => { + let field_ty = field.ty; + let span = field.original.span(); + let func = + quote_spanned!(span=> _serde::de::MapAccess::next_value::<#field_ty>); + quote! { + try!(#func(&mut __map)) + } + } + Some(path) => { + let (wrapper, wrapper_ty) = wrap_deserialize_field_with(params, field.ty, path); + quote!({ + #wrapper + match _serde::de::MapAccess::next_value::<#wrapper_ty>(&mut __map) { + _serde::__private::Ok(__wrapper) => __wrapper.value, + _serde::__private::Err(__err) => { + return _serde::__private::Err(__err); + } + } + }) + } + }; + quote! { + __Field::#name => { + if _serde::__private::Option::is_some(&#name) { + return _serde::__private::Err(<__A::Error as _serde::de::Error>::duplicate_field(#deser_name)); + } + #name = _serde::__private::Some(#visit); + } + } + }); + + // Visit ignored values to consume them + let ignored_arm = if cattrs.has_flatten() { + Some(quote! { + __Field::__other(__name) => { + __collect.push(_serde::__private::Some(( + __name, + try!(_serde::de::MapAccess::next_value(&mut __map))))); + } + }) + } else if cattrs.deny_unknown_fields() { + None + } else { + Some(quote! { + _ => { let _ = try!(_serde::de::MapAccess::next_value::<_serde::de::IgnoredAny>(&mut __map)); } + }) + }; + + let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing()); + let match_keys = if cattrs.deny_unknown_fields() && all_skipped { + quote! { + // FIXME: Once we drop support for Rust 1.15: + // let _serde::__private::None::<__Field> = try!(_serde::de::MapAccess::next_key(&mut __map)); + _serde::__private::Option::map( + try!(_serde::de::MapAccess::next_key::<__Field>(&mut __map)), + |__impossible| match __impossible {}); + } + } else { + quote! { + while let _serde::__private::Some(__key) = try!(_serde::de::MapAccess::next_key::<__Field>(&mut __map)) { + match __key { + #(#value_arms)* + #ignored_arm + } + } + } + }; + + let extract_values = fields_names + .iter() + .filter(|&&(field, _)| !field.attrs.skip_deserializing() && !field.attrs.flatten()) + .map(|(field, name)| { + let missing_expr = Match(expr_is_missing(field, cattrs)); + + quote! { + let #name = match #name { + _serde::__private::Some(#name) => #name, + _serde::__private::None => #missing_expr + }; + } + }); + + let extract_collected = fields_names + .iter() + .filter(|&&(field, _)| field.attrs.flatten() && !field.attrs.skip_deserializing()) + .map(|(field, name)| { + let field_ty = field.ty; + let func = match field.attrs.deserialize_with() { + None => { + let span = field.original.span(); + quote_spanned!(span=> _serde::de::Deserialize::deserialize) + } + Some(path) => quote!(#path), + }; + quote! { + let #name: #field_ty = try!(#func( + _serde::__private::de::FlatMapDeserializer( + &mut __collect, + _serde::__private::PhantomData))); + } + }); + + let collected_deny_unknown_fields = if cattrs.has_flatten() && cattrs.deny_unknown_fields() { + Some(quote! { + if let _serde::__private::Some(_serde::__private::Some((__key, _))) = + __collect.into_iter().filter(_serde::__private::Option::is_some).next() + { + if let _serde::__private::Some(__key) = __key.as_str() { + return _serde::__private::Err( + _serde::de::Error::custom(format_args!("unknown field `{}`", &__key))); + } else { + return _serde::__private::Err( + _serde::de::Error::custom(format_args!("unexpected map key"))); + } + } + }) + } else { + None + }; + + let result = fields_names.iter().map(|(field, name)| { + let member = &field.member; + if field.attrs.skip_deserializing() { + let value = Expr(expr_is_missing(field, cattrs)); + quote!(#member: #value) + } else { + quote!(#member: #name) + } + }); + + let let_default = match cattrs.default() { + attr::Default::Default => Some(quote!( + let __default: Self::Value = _serde::__private::Default::default(); + )), + attr::Default::Path(path) => Some(quote!( + let __default: Self::Value = #path(); + )), + attr::Default::None => { + // We don't need the default value, to prevent an unused variable warning + // we'll leave the line empty. + None + } + }; + + let mut result = quote!(#struct_path { #(#result),* }); + if params.has_getter { + let this = ¶ms.this; + result = quote! { + _serde::__private::Into::<#this>::into(#result) + }; + } + + quote_block! { + #(#let_values)* + + #let_collect + + #match_keys + + #let_default + + #(#extract_values)* + + #(#extract_collected)* + + #collected_deny_unknown_fields + + _serde::__private::Ok(#result) + } +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_struct_as_struct_in_place_visitor( + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> (Fragment, Fragment, Fragment) { + assert!(!cattrs.has_flatten()); + + let field_names_idents: Vec<_> = fields + .iter() + .enumerate() + .filter(|&(_, field)| !field.attrs.skip_deserializing()) + .map(|(i, field)| { + ( + field.attrs.name().deserialize_name(), + field_i(i), + field.attrs.aliases(), + ) + }) + .collect(); + + let fields_stmt = { + let field_names = field_names_idents.iter().map(|(name, _, _)| name); + quote_block! { + const FIELDS: &'static [&'static str] = &[ #(#field_names),* ]; + } + }; + + let field_visitor = deserialize_generated_identifier(&field_names_idents, cattrs, false, None); + + let visit_map = deserialize_map_in_place(params, fields, cattrs); + + (field_visitor, fields_stmt, visit_map) +} + +#[cfg(feature = "deserialize_in_place")] +fn deserialize_map_in_place( + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> Fragment { + assert!(!cattrs.has_flatten()); + + // Create the field names for the fields. + let fields_names: Vec<_> = fields + .iter() + .enumerate() + .map(|(i, field)| (field, field_i(i))) + .collect(); + + // For deserialize_in_place, declare booleans for each field that will be + // deserialized. + let let_flags = fields_names + .iter() + .filter(|&&(field, _)| !field.attrs.skip_deserializing()) + .map(|(_, name)| { + quote! { + let mut #name: bool = false; + } + }); + + // Match arms to extract a value for a field. + let value_arms_from = fields_names + .iter() + .filter(|&&(field, _)| !field.attrs.skip_deserializing()) + .map(|(field, name)| { + let deser_name = field.attrs.name().deserialize_name(); + let member = &field.member; + + let visit = match field.attrs.deserialize_with() { + None => { + quote! { + try!(_serde::de::MapAccess::next_value_seed(&mut __map, _serde::__private::de::InPlaceSeed(&mut self.place.#member))) + } + } + Some(path) => { + let (wrapper, wrapper_ty) = wrap_deserialize_field_with(params, field.ty, path); + quote!({ + #wrapper + self.place.#member = match _serde::de::MapAccess::next_value::<#wrapper_ty>(&mut __map) { + _serde::__private::Ok(__wrapper) => __wrapper.value, + _serde::__private::Err(__err) => { + return _serde::__private::Err(__err); + } + }; + }) + } + }; + quote! { + __Field::#name => { + if #name { + return _serde::__private::Err(<__A::Error as _serde::de::Error>::duplicate_field(#deser_name)); + } + #visit; + #name = true; + } + } + }); + + // Visit ignored values to consume them + let ignored_arm = if cattrs.deny_unknown_fields() { + None + } else { + Some(quote! { + _ => { let _ = try!(_serde::de::MapAccess::next_value::<_serde::de::IgnoredAny>(&mut __map)); } + }) + }; + + let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing()); + + let match_keys = if cattrs.deny_unknown_fields() && all_skipped { + quote! { + // FIXME: Once we drop support for Rust 1.15: + // let _serde::__private::None::<__Field> = try!(_serde::de::MapAccess::next_key(&mut __map)); + _serde::__private::Option::map( + try!(_serde::de::MapAccess::next_key::<__Field>(&mut __map)), + |__impossible| match __impossible {}); + } + } else { + quote! { + while let _serde::__private::Some(__key) = try!(_serde::de::MapAccess::next_key::<__Field>(&mut __map)) { + match __key { + #(#value_arms_from)* + #ignored_arm + } + } + } + }; + + let check_flags = fields_names + .iter() + .filter(|&&(field, _)| !field.attrs.skip_deserializing()) + .map(|(field, name)| { + let missing_expr = expr_is_missing(field, cattrs); + // If missing_expr unconditionally returns an error, don't try + // to assign its value to self.place. + if field.attrs.default().is_none() + && cattrs.default().is_none() + && field.attrs.deserialize_with().is_some() + { + let missing_expr = Stmts(missing_expr); + quote! { + if !#name { + #missing_expr; + } + } + } else { + let member = &field.member; + let missing_expr = Expr(missing_expr); + quote! { + if !#name { + self.place.#member = #missing_expr; + }; + } + } + }); + + let this = ¶ms.this; + let (_, _, ty_generics, _) = split_with_de_lifetime(params); + + let let_default = match cattrs.default() { + attr::Default::Default => Some(quote!( + let __default: #this #ty_generics = _serde::__private::Default::default(); + )), + attr::Default::Path(path) => Some(quote!( + let __default: #this #ty_generics = #path(); + )), + attr::Default::None => { + // We don't need the default value, to prevent an unused variable warning + // we'll leave the line empty. + None + } + }; + + quote_block! { + #(#let_flags)* + + #match_keys + + #let_default + + #(#check_flags)* + + _serde::__private::Ok(()) + } +} + +fn field_i(i: usize) -> Ident { + Ident::new(&format!("__field{}", i), Span::call_site()) +} + +/// This function wraps the expression in `#[serde(deserialize_with = "...")]` +/// in a trait to prevent it from accessing the internal `Deserialize` state. +fn wrap_deserialize_with( + params: &Parameters, + value_ty: &TokenStream, + deserialize_with: &syn::ExprPath, +) -> (TokenStream, TokenStream) { + let this = ¶ms.this; + let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = + split_with_de_lifetime(params); + let delife = params.borrowed.de_lifetime(); + + let wrapper = quote! { + struct __DeserializeWith #de_impl_generics #where_clause { + value: #value_ty, + phantom: _serde::__private::PhantomData<#this #ty_generics>, + lifetime: _serde::__private::PhantomData<&#delife ()>, + } + + impl #de_impl_generics _serde::Deserialize<#delife> for __DeserializeWith #de_ty_generics #where_clause { + fn deserialize<__D>(__deserializer: __D) -> _serde::__private::Result<Self, __D::Error> + where + __D: _serde::Deserializer<#delife>, + { + _serde::__private::Ok(__DeserializeWith { + value: try!(#deserialize_with(__deserializer)), + phantom: _serde::__private::PhantomData, + lifetime: _serde::__private::PhantomData, + }) + } + } + }; + + let wrapper_ty = quote!(__DeserializeWith #de_ty_generics); + + (wrapper, wrapper_ty) +} + +fn wrap_deserialize_field_with( + params: &Parameters, + field_ty: &syn::Type, + deserialize_with: &syn::ExprPath, +) -> (TokenStream, TokenStream) { + wrap_deserialize_with(params, "e!(#field_ty), deserialize_with) +} + +fn wrap_deserialize_variant_with( + params: &Parameters, + variant: &Variant, + deserialize_with: &syn::ExprPath, +) -> (TokenStream, TokenStream, TokenStream) { + let field_tys = variant.fields.iter().map(|field| field.ty); + let (wrapper, wrapper_ty) = + wrap_deserialize_with(params, "e!((#(#field_tys),*)), deserialize_with); + + let unwrap_fn = unwrap_to_variant_closure(params, variant, true); + + (wrapper, wrapper_ty, unwrap_fn) +} + +// Generates closure that converts single input parameter to the final value. +fn unwrap_to_variant_closure( + params: &Parameters, + variant: &Variant, + with_wrapper: bool, +) -> TokenStream { + let this = ¶ms.this; + let variant_ident = &variant.ident; + + let (arg, wrapper) = if with_wrapper { + (quote! { __wrap }, quote! { __wrap.value }) + } else { + let field_tys = variant.fields.iter().map(|field| field.ty); + (quote! { __wrap: (#(#field_tys),*) }, quote! { __wrap }) + }; + + let field_access = (0..variant.fields.len()).map(|n| { + Member::Unnamed(Index { + index: n as u32, + span: Span::call_site(), + }) + }); + + match variant.style { + Style::Struct if variant.fields.len() == 1 => { + let member = &variant.fields[0].member; + quote! { + |#arg| #this::#variant_ident { #member: #wrapper } + } + } + Style::Struct => { + let members = variant.fields.iter().map(|field| &field.member); + quote! { + |#arg| #this::#variant_ident { #(#members: #wrapper.#field_access),* } + } + } + Style::Tuple => quote! { + |#arg| #this::#variant_ident(#(#wrapper.#field_access),*) + }, + Style::Newtype => quote! { + |#arg| #this::#variant_ident(#wrapper) + }, + Style::Unit => quote! { + |#arg| #this::#variant_ident + }, + } +} + +fn expr_is_missing(field: &Field, cattrs: &attr::Container) -> Fragment { + match field.attrs.default() { + attr::Default::Default => { + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::__private::Default::default); + return quote_expr!(#func()); + } + attr::Default::Path(path) => { + return quote_expr!(#path()); + } + attr::Default::None => { /* below */ } + } + + match *cattrs.default() { + attr::Default::Default | attr::Default::Path(_) => { + let member = &field.member; + return quote_expr!(__default.#member); + } + attr::Default::None => { /* below */ } + } + + let name = field.attrs.name().deserialize_name(); + match field.attrs.deserialize_with() { + None => { + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::__private::de::missing_field); + quote_expr! { + try!(#func(#name)) + } + } + Some(_) => { + quote_expr! { + return _serde::__private::Err(<__A::Error as _serde::de::Error>::missing_field(#name)) + } + } + } +} + +fn effective_style(variant: &Variant) -> Style { + match variant.style { + Style::Newtype if variant.fields[0].attrs.skip_deserializing() => Style::Unit, + other => other, + } +} + +struct DeImplGenerics<'a>(&'a Parameters); +#[cfg(feature = "deserialize_in_place")] +struct InPlaceImplGenerics<'a>(&'a Parameters); + +impl<'a> ToTokens for DeImplGenerics<'a> { + fn to_tokens(&self, tokens: &mut TokenStream) { + let mut generics = self.0.generics.clone(); + if let Some(de_lifetime) = self.0.borrowed.de_lifetime_def() { + generics.params = Some(syn::GenericParam::Lifetime(de_lifetime)) + .into_iter() + .chain(generics.params) + .collect(); + } + let (impl_generics, _, _) = generics.split_for_impl(); + impl_generics.to_tokens(tokens); + } +} + +#[cfg(feature = "deserialize_in_place")] +impl<'a> ToTokens for InPlaceImplGenerics<'a> { + fn to_tokens(&self, tokens: &mut TokenStream) { + let place_lifetime = place_lifetime(); + let mut generics = self.0.generics.clone(); + + // Add lifetime for `&'place mut Self, and `'a: 'place` + for param in &mut generics.params { + match param { + syn::GenericParam::Lifetime(param) => { + param.bounds.push(place_lifetime.lifetime.clone()); + } + syn::GenericParam::Type(param) => { + param.bounds.push(syn::TypeParamBound::Lifetime( + place_lifetime.lifetime.clone(), + )); + } + syn::GenericParam::Const(_) => {} + } + } + generics.params = Some(syn::GenericParam::Lifetime(place_lifetime)) + .into_iter() + .chain(generics.params) + .collect(); + if let Some(de_lifetime) = self.0.borrowed.de_lifetime_def() { + generics.params = Some(syn::GenericParam::Lifetime(de_lifetime)) + .into_iter() + .chain(generics.params) + .collect(); + } + let (impl_generics, _, _) = generics.split_for_impl(); + impl_generics.to_tokens(tokens); + } +} + +#[cfg(feature = "deserialize_in_place")] +impl<'a> DeImplGenerics<'a> { + fn in_place(self) -> InPlaceImplGenerics<'a> { + InPlaceImplGenerics(self.0) + } +} + +struct DeTypeGenerics<'a>(&'a Parameters); +#[cfg(feature = "deserialize_in_place")] +struct InPlaceTypeGenerics<'a>(&'a Parameters); + +impl<'a> ToTokens for DeTypeGenerics<'a> { + fn to_tokens(&self, tokens: &mut TokenStream) { + let mut generics = self.0.generics.clone(); + if self.0.borrowed.de_lifetime_def().is_some() { + let def = syn::LifetimeDef { + attrs: Vec::new(), + lifetime: syn::Lifetime::new("'de", Span::call_site()), + colon_token: None, + bounds: Punctuated::new(), + }; + generics.params = Some(syn::GenericParam::Lifetime(def)) + .into_iter() + .chain(generics.params) + .collect(); + } + let (_, ty_generics, _) = generics.split_for_impl(); + ty_generics.to_tokens(tokens); + } +} + +#[cfg(feature = "deserialize_in_place")] +impl<'a> ToTokens for InPlaceTypeGenerics<'a> { + fn to_tokens(&self, tokens: &mut TokenStream) { + let mut generics = self.0.generics.clone(); + generics.params = Some(syn::GenericParam::Lifetime(place_lifetime())) + .into_iter() + .chain(generics.params) + .collect(); + + if self.0.borrowed.de_lifetime_def().is_some() { + let def = syn::LifetimeDef { + attrs: Vec::new(), + lifetime: syn::Lifetime::new("'de", Span::call_site()), + colon_token: None, + bounds: Punctuated::new(), + }; + generics.params = Some(syn::GenericParam::Lifetime(def)) + .into_iter() + .chain(generics.params) + .collect(); + } + let (_, ty_generics, _) = generics.split_for_impl(); + ty_generics.to_tokens(tokens); + } +} + +#[cfg(feature = "deserialize_in_place")] +impl<'a> DeTypeGenerics<'a> { + fn in_place(self) -> InPlaceTypeGenerics<'a> { + InPlaceTypeGenerics(self.0) + } +} + +#[cfg(feature = "deserialize_in_place")] +fn place_lifetime() -> syn::LifetimeDef { + syn::LifetimeDef { + attrs: Vec::new(), + lifetime: syn::Lifetime::new("'place", Span::call_site()), + colon_token: None, + bounds: Punctuated::new(), + } +} + +fn split_with_de_lifetime( + params: &Parameters, +) -> ( + DeImplGenerics, + DeTypeGenerics, + syn::TypeGenerics, + Option<&syn::WhereClause>, +) { + let de_impl_generics = DeImplGenerics(params); + let de_ty_generics = DeTypeGenerics(params); + let (_, ty_generics, where_clause) = params.generics.split_for_impl(); + (de_impl_generics, de_ty_generics, ty_generics, where_clause) +} diff --git a/vendor/serde_derive/src/dummy.rs b/vendor/serde_derive/src/dummy.rs new file mode 100644 index 000000000..a02bd3762 --- /dev/null +++ b/vendor/serde_derive/src/dummy.rs @@ -0,0 +1,48 @@ +use proc_macro2::{Ident, TokenStream}; +use quote::format_ident; + +use syn; +use try; + +pub fn wrap_in_const( + serde_path: Option<&syn::Path>, + trait_: &str, + ty: &Ident, + code: TokenStream, +) -> TokenStream { + let try_replacement = try::replacement(); + + let dummy_const = if cfg!(no_underscore_consts) { + format_ident!("_IMPL_{}_FOR_{}", trait_, unraw(ty)) + } else { + format_ident!("_") + }; + + let use_serde = match serde_path { + Some(path) => quote! { + use #path as _serde; + }, + None => quote! { + #[allow(unused_extern_crates, clippy::useless_attribute)] + extern crate serde as _serde; + }, + }; + + quote! { + #[doc(hidden)] + #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)] + const #dummy_const: () = { + #use_serde + #try_replacement + #code + }; + } +} + +#[allow(deprecated)] +fn unraw(ident: &Ident) -> String { + // str::trim_start_matches was added in 1.30, trim_left_matches deprecated + // in 1.33. We currently support rustc back to 1.15 so we need to continue + // to use the deprecated one. + ident.to_string().trim_left_matches("r#").to_owned() +} diff --git a/vendor/serde_derive/src/fragment.rs b/vendor/serde_derive/src/fragment.rs new file mode 100644 index 000000000..324504aa4 --- /dev/null +++ b/vendor/serde_derive/src/fragment.rs @@ -0,0 +1,74 @@ +use proc_macro2::TokenStream; +use quote::ToTokens; +use syn::token; + +pub enum Fragment { + /// Tokens that can be used as an expression. + Expr(TokenStream), + /// Tokens that can be used inside a block. The surrounding curly braces are + /// not part of these tokens. + Block(TokenStream), +} + +macro_rules! quote_expr { + ($($tt:tt)*) => { + $crate::fragment::Fragment::Expr(quote!($($tt)*)) + } +} + +macro_rules! quote_block { + ($($tt:tt)*) => { + $crate::fragment::Fragment::Block(quote!($($tt)*)) + } +} + +/// Interpolate a fragment in place of an expression. This involves surrounding +/// Block fragments in curly braces. +pub struct Expr(pub Fragment); +impl ToTokens for Expr { + fn to_tokens(&self, out: &mut TokenStream) { + match &self.0 { + Fragment::Expr(expr) => expr.to_tokens(out), + Fragment::Block(block) => { + token::Brace::default().surround(out, |out| block.to_tokens(out)); + } + } + } +} + +/// Interpolate a fragment as the statements of a block. +pub struct Stmts(pub Fragment); +impl ToTokens for Stmts { + fn to_tokens(&self, out: &mut TokenStream) { + match &self.0 { + Fragment::Expr(expr) => expr.to_tokens(out), + Fragment::Block(block) => block.to_tokens(out), + } + } +} + +/// Interpolate a fragment as the value part of a `match` expression. This +/// involves putting a comma after expressions and curly braces around blocks. +pub struct Match(pub Fragment); +impl ToTokens for Match { + fn to_tokens(&self, out: &mut TokenStream) { + match &self.0 { + Fragment::Expr(expr) => { + expr.to_tokens(out); + <Token![,]>::default().to_tokens(out); + } + Fragment::Block(block) => { + token::Brace::default().surround(out, |out| block.to_tokens(out)); + } + } + } +} + +impl AsRef<TokenStream> for Fragment { + fn as_ref(&self) -> &TokenStream { + match self { + Fragment::Expr(expr) => expr, + Fragment::Block(block) => block, + } + } +} diff --git a/vendor/serde_derive/src/internals/ast.rs b/vendor/serde_derive/src/internals/ast.rs new file mode 100644 index 000000000..2a6950b2a --- /dev/null +++ b/vendor/serde_derive/src/internals/ast.rs @@ -0,0 +1,202 @@ +//! A Serde ast, parsed from the Syn ast and ready to generate Rust code. + +use internals::attr; +use internals::check; +use internals::{Ctxt, Derive}; +use syn; +use syn::punctuated::Punctuated; + +/// A source data structure annotated with `#[derive(Serialize)]` and/or `#[derive(Deserialize)]`, +/// parsed into an internal representation. +pub struct Container<'a> { + /// The struct or enum name (without generics). + pub ident: syn::Ident, + /// Attributes on the structure, parsed for Serde. + pub attrs: attr::Container, + /// The contents of the struct or enum. + pub data: Data<'a>, + /// Any generics on the struct or enum. + pub generics: &'a syn::Generics, + /// Original input. + pub original: &'a syn::DeriveInput, +} + +/// The fields of a struct or enum. +/// +/// Analogous to `syn::Data`. +pub enum Data<'a> { + Enum(Vec<Variant<'a>>), + Struct(Style, Vec<Field<'a>>), +} + +/// A variant of an enum. +pub struct Variant<'a> { + pub ident: syn::Ident, + pub attrs: attr::Variant, + pub style: Style, + pub fields: Vec<Field<'a>>, + pub original: &'a syn::Variant, +} + +/// A field of a struct. +pub struct Field<'a> { + pub member: syn::Member, + pub attrs: attr::Field, + pub ty: &'a syn::Type, + pub original: &'a syn::Field, +} + +#[derive(Copy, Clone)] +pub enum Style { + /// Named fields. + Struct, + /// Many unnamed fields. + Tuple, + /// One unnamed field. + Newtype, + /// No fields. + Unit, +} + +impl<'a> Container<'a> { + /// Convert the raw Syn ast into a parsed container object, collecting errors in `cx`. + pub fn from_ast( + cx: &Ctxt, + item: &'a syn::DeriveInput, + derive: Derive, + ) -> Option<Container<'a>> { + let mut attrs = attr::Container::from_ast(cx, item); + + let mut data = match &item.data { + syn::Data::Enum(data) => Data::Enum(enum_from_ast(cx, &data.variants, attrs.default())), + syn::Data::Struct(data) => { + let (style, fields) = struct_from_ast(cx, &data.fields, None, attrs.default()); + Data::Struct(style, fields) + } + syn::Data::Union(_) => { + cx.error_spanned_by(item, "Serde does not support derive for unions"); + return None; + } + }; + + let mut has_flatten = false; + match &mut data { + Data::Enum(variants) => { + for variant in variants { + variant.attrs.rename_by_rules(attrs.rename_all_rules()); + for field in &mut variant.fields { + if field.attrs.flatten() { + has_flatten = true; + } + field + .attrs + .rename_by_rules(variant.attrs.rename_all_rules()); + } + } + } + Data::Struct(_, fields) => { + for field in fields { + if field.attrs.flatten() { + has_flatten = true; + } + field.attrs.rename_by_rules(attrs.rename_all_rules()); + } + } + } + + if has_flatten { + attrs.mark_has_flatten(); + } + + let mut item = Container { + ident: item.ident.clone(), + attrs, + data, + generics: &item.generics, + original: item, + }; + check::check(cx, &mut item, derive); + Some(item) + } +} + +impl<'a> Data<'a> { + pub fn all_fields(&'a self) -> Box<Iterator<Item = &'a Field<'a>> + 'a> { + match self { + Data::Enum(variants) => { + Box::new(variants.iter().flat_map(|variant| variant.fields.iter())) + } + Data::Struct(_, fields) => Box::new(fields.iter()), + } + } + + pub fn has_getter(&self) -> bool { + self.all_fields().any(|f| f.attrs.getter().is_some()) + } +} + +fn enum_from_ast<'a>( + cx: &Ctxt, + variants: &'a Punctuated<syn::Variant, Token![,]>, + container_default: &attr::Default, +) -> Vec<Variant<'a>> { + variants + .iter() + .map(|variant| { + let attrs = attr::Variant::from_ast(cx, variant); + let (style, fields) = + struct_from_ast(cx, &variant.fields, Some(&attrs), container_default); + Variant { + ident: variant.ident.clone(), + attrs, + style, + fields, + original: variant, + } + }) + .collect() +} + +fn struct_from_ast<'a>( + cx: &Ctxt, + fields: &'a syn::Fields, + attrs: Option<&attr::Variant>, + container_default: &attr::Default, +) -> (Style, Vec<Field<'a>>) { + match fields { + syn::Fields::Named(fields) => ( + Style::Struct, + fields_from_ast(cx, &fields.named, attrs, container_default), + ), + syn::Fields::Unnamed(fields) if fields.unnamed.len() == 1 => ( + Style::Newtype, + fields_from_ast(cx, &fields.unnamed, attrs, container_default), + ), + syn::Fields::Unnamed(fields) => ( + Style::Tuple, + fields_from_ast(cx, &fields.unnamed, attrs, container_default), + ), + syn::Fields::Unit => (Style::Unit, Vec::new()), + } +} + +fn fields_from_ast<'a>( + cx: &Ctxt, + fields: &'a Punctuated<syn::Field, Token![,]>, + attrs: Option<&attr::Variant>, + container_default: &attr::Default, +) -> Vec<Field<'a>> { + fields + .iter() + .enumerate() + .map(|(i, field)| Field { + member: match &field.ident { + Some(ident) => syn::Member::Named(ident.clone()), + None => syn::Member::Unnamed(i.into()), + }, + attrs: attr::Field::from_ast(cx, i, field, attrs, container_default), + ty: &field.ty, + original: field, + }) + .collect() +} diff --git a/vendor/serde_derive/src/internals/attr.rs b/vendor/serde_derive/src/internals/attr.rs new file mode 100644 index 000000000..dc532484d --- /dev/null +++ b/vendor/serde_derive/src/internals/attr.rs @@ -0,0 +1,1952 @@ +use internals::respan::respan; +use internals::symbol::*; +use internals::{ungroup, Ctxt}; +use proc_macro2::{Spacing, Span, TokenStream, TokenTree}; +use quote::ToTokens; +use std::borrow::Cow; +use std::collections::BTreeSet; +use syn; +use syn::parse::{self, Parse, ParseStream}; +use syn::punctuated::Punctuated; +use syn::Ident; +use syn::Meta::{List, NameValue, Path}; +use syn::NestedMeta::{Lit, Meta}; + +// This module handles parsing of `#[serde(...)]` attributes. The entrypoints +// are `attr::Container::from_ast`, `attr::Variant::from_ast`, and +// `attr::Field::from_ast`. Each returns an instance of the corresponding +// struct. Note that none of them return a Result. Unrecognized, malformed, or +// duplicated attributes result in a span_err but otherwise are ignored. The +// user will see errors simultaneously for all bad attributes in the crate +// rather than just the first. + +pub use internals::case::RenameRule; + +struct Attr<'c, T> { + cx: &'c Ctxt, + name: Symbol, + tokens: TokenStream, + value: Option<T>, +} + +impl<'c, T> Attr<'c, T> { + fn none(cx: &'c Ctxt, name: Symbol) -> Self { + Attr { + cx, + name, + tokens: TokenStream::new(), + value: None, + } + } + + fn set<A: ToTokens>(&mut self, obj: A, value: T) { + let tokens = obj.into_token_stream(); + + if self.value.is_some() { + self.cx + .error_spanned_by(tokens, format!("duplicate serde attribute `{}`", self.name)); + } else { + self.tokens = tokens; + self.value = Some(value); + } + } + + fn set_opt<A: ToTokens>(&mut self, obj: A, value: Option<T>) { + if let Some(value) = value { + self.set(obj, value); + } + } + + fn set_if_none(&mut self, value: T) { + if self.value.is_none() { + self.value = Some(value); + } + } + + fn get(self) -> Option<T> { + self.value + } + + fn get_with_tokens(self) -> Option<(TokenStream, T)> { + match self.value { + Some(v) => Some((self.tokens, v)), + None => None, + } + } +} + +struct BoolAttr<'c>(Attr<'c, ()>); + +impl<'c> BoolAttr<'c> { + fn none(cx: &'c Ctxt, name: Symbol) -> Self { + BoolAttr(Attr::none(cx, name)) + } + + fn set_true<A: ToTokens>(&mut self, obj: A) { + self.0.set(obj, ()); + } + + fn get(&self) -> bool { + self.0.value.is_some() + } +} + +struct VecAttr<'c, T> { + cx: &'c Ctxt, + name: Symbol, + first_dup_tokens: TokenStream, + values: Vec<T>, +} + +impl<'c, T> VecAttr<'c, T> { + fn none(cx: &'c Ctxt, name: Symbol) -> Self { + VecAttr { + cx, + name, + first_dup_tokens: TokenStream::new(), + values: Vec::new(), + } + } + + fn insert<A: ToTokens>(&mut self, obj: A, value: T) { + if self.values.len() == 1 { + self.first_dup_tokens = obj.into_token_stream(); + } + self.values.push(value); + } + + fn at_most_one(mut self) -> Result<Option<T>, ()> { + if self.values.len() > 1 { + let dup_token = self.first_dup_tokens; + self.cx.error_spanned_by( + dup_token, + format!("duplicate serde attribute `{}`", self.name), + ); + Err(()) + } else { + Ok(self.values.pop()) + } + } + + fn get(self) -> Vec<T> { + self.values + } +} + +pub struct Name { + serialize: String, + serialize_renamed: bool, + deserialize: String, + deserialize_renamed: bool, + deserialize_aliases: Vec<String>, +} + +#[allow(deprecated)] +fn unraw(ident: &Ident) -> String { + // str::trim_start_matches was added in 1.30, trim_left_matches deprecated + // in 1.33. We currently support rustc back to 1.15 so we need to continue + // to use the deprecated one. + ident.to_string().trim_left_matches("r#").to_owned() +} + +impl Name { + fn from_attrs( + source_name: String, + ser_name: Attr<String>, + de_name: Attr<String>, + de_aliases: Option<VecAttr<String>>, + ) -> Name { + let deserialize_aliases = match de_aliases { + Some(de_aliases) => { + let mut alias_list = BTreeSet::new(); + for alias_name in de_aliases.get() { + alias_list.insert(alias_name); + } + alias_list.into_iter().collect() + } + None => Vec::new(), + }; + + let ser_name = ser_name.get(); + let ser_renamed = ser_name.is_some(); + let de_name = de_name.get(); + let de_renamed = de_name.is_some(); + Name { + serialize: ser_name.unwrap_or_else(|| source_name.clone()), + serialize_renamed: ser_renamed, + deserialize: de_name.unwrap_or(source_name), + deserialize_renamed: de_renamed, + deserialize_aliases, + } + } + + /// Return the container name for the container when serializing. + pub fn serialize_name(&self) -> String { + self.serialize.clone() + } + + /// Return the container name for the container when deserializing. + pub fn deserialize_name(&self) -> String { + self.deserialize.clone() + } + + fn deserialize_aliases(&self) -> Vec<String> { + let mut aliases = self.deserialize_aliases.clone(); + let main_name = self.deserialize_name(); + if !aliases.contains(&main_name) { + aliases.push(main_name); + } + aliases + } +} + +pub struct RenameAllRules { + serialize: RenameRule, + deserialize: RenameRule, +} + +/// Represents struct or enum attribute information. +pub struct Container { + name: Name, + transparent: bool, + deny_unknown_fields: bool, + default: Default, + rename_all_rules: RenameAllRules, + ser_bound: Option<Vec<syn::WherePredicate>>, + de_bound: Option<Vec<syn::WherePredicate>>, + tag: TagType, + type_from: Option<syn::Type>, + type_try_from: Option<syn::Type>, + type_into: Option<syn::Type>, + remote: Option<syn::Path>, + identifier: Identifier, + has_flatten: bool, + serde_path: Option<syn::Path>, + is_packed: bool, + /// Error message generated when type can't be deserialized + expecting: Option<String>, +} + +/// Styles of representing an enum. +pub enum TagType { + /// The default. + /// + /// ```json + /// {"variant1": {"key1": "value1", "key2": "value2"}} + /// ``` + External, + + /// `#[serde(tag = "type")]` + /// + /// ```json + /// {"type": "variant1", "key1": "value1", "key2": "value2"} + /// ``` + Internal { tag: String }, + + /// `#[serde(tag = "t", content = "c")]` + /// + /// ```json + /// {"t": "variant1", "c": {"key1": "value1", "key2": "value2"}} + /// ``` + Adjacent { tag: String, content: String }, + + /// `#[serde(untagged)]` + /// + /// ```json + /// {"key1": "value1", "key2": "value2"} + /// ``` + None, +} + +/// Whether this enum represents the fields of a struct or the variants of an +/// enum. +#[derive(Copy, Clone)] +pub enum Identifier { + /// It does not. + No, + + /// This enum represents the fields of a struct. All of the variants must be + /// unit variants, except possibly one which is annotated with + /// `#[serde(other)]` and is a newtype variant. + Field, + + /// This enum represents the variants of an enum. All of the variants must + /// be unit variants. + Variant, +} + +impl Identifier { + #[cfg(feature = "deserialize_in_place")] + pub fn is_some(self) -> bool { + match self { + Identifier::No => false, + Identifier::Field | Identifier::Variant => true, + } + } +} + +impl Container { + /// Extract out the `#[serde(...)]` attributes from an item. + pub fn from_ast(cx: &Ctxt, item: &syn::DeriveInput) -> Self { + let mut ser_name = Attr::none(cx, RENAME); + let mut de_name = Attr::none(cx, RENAME); + let mut transparent = BoolAttr::none(cx, TRANSPARENT); + let mut deny_unknown_fields = BoolAttr::none(cx, DENY_UNKNOWN_FIELDS); + let mut default = Attr::none(cx, DEFAULT); + let mut rename_all_ser_rule = Attr::none(cx, RENAME_ALL); + let mut rename_all_de_rule = Attr::none(cx, RENAME_ALL); + let mut ser_bound = Attr::none(cx, BOUND); + let mut de_bound = Attr::none(cx, BOUND); + let mut untagged = BoolAttr::none(cx, UNTAGGED); + let mut internal_tag = Attr::none(cx, TAG); + let mut content = Attr::none(cx, CONTENT); + let mut type_from = Attr::none(cx, FROM); + let mut type_try_from = Attr::none(cx, TRY_FROM); + let mut type_into = Attr::none(cx, INTO); + let mut remote = Attr::none(cx, REMOTE); + let mut field_identifier = BoolAttr::none(cx, FIELD_IDENTIFIER); + let mut variant_identifier = BoolAttr::none(cx, VARIANT_IDENTIFIER); + let mut serde_path = Attr::none(cx, CRATE); + let mut expecting = Attr::none(cx, EXPECTING); + + for meta_item in item + .attrs + .iter() + .flat_map(|attr| get_serde_meta_items(cx, attr)) + .flatten() + { + match &meta_item { + // Parse `#[serde(rename = "foo")]` + Meta(NameValue(m)) if m.path == RENAME => { + if let Ok(s) = get_lit_str(cx, RENAME, &m.lit) { + ser_name.set(&m.path, s.value()); + de_name.set(&m.path, s.value()); + } + } + + // Parse `#[serde(rename(serialize = "foo", deserialize = "bar"))]` + Meta(List(m)) if m.path == RENAME => { + if let Ok((ser, de)) = get_renames(cx, &m.nested) { + ser_name.set_opt(&m.path, ser.map(syn::LitStr::value)); + de_name.set_opt(&m.path, de.map(syn::LitStr::value)); + } + } + + // Parse `#[serde(rename_all = "foo")]` + Meta(NameValue(m)) if m.path == RENAME_ALL => { + if let Ok(s) = get_lit_str(cx, RENAME_ALL, &m.lit) { + match RenameRule::from_str(&s.value()) { + Ok(rename_rule) => { + rename_all_ser_rule.set(&m.path, rename_rule); + rename_all_de_rule.set(&m.path, rename_rule); + } + Err(err) => cx.error_spanned_by(s, err), + } + } + } + + // Parse `#[serde(rename_all(serialize = "foo", deserialize = "bar"))]` + Meta(List(m)) if m.path == RENAME_ALL => { + if let Ok((ser, de)) = get_renames(cx, &m.nested) { + if let Some(ser) = ser { + match RenameRule::from_str(&ser.value()) { + Ok(rename_rule) => rename_all_ser_rule.set(&m.path, rename_rule), + Err(err) => cx.error_spanned_by(ser, err), + } + } + if let Some(de) = de { + match RenameRule::from_str(&de.value()) { + Ok(rename_rule) => rename_all_de_rule.set(&m.path, rename_rule), + Err(err) => cx.error_spanned_by(de, err), + } + } + } + } + + // Parse `#[serde(transparent)]` + Meta(Path(word)) if word == TRANSPARENT => { + transparent.set_true(word); + } + + // Parse `#[serde(deny_unknown_fields)]` + Meta(Path(word)) if word == DENY_UNKNOWN_FIELDS => { + deny_unknown_fields.set_true(word); + } + + // Parse `#[serde(default)]` + Meta(Path(word)) if word == DEFAULT => match &item.data { + syn::Data::Struct(syn::DataStruct { fields, .. }) => match fields { + syn::Fields::Named(_) => { + default.set(word, Default::Default); + } + syn::Fields::Unnamed(_) | syn::Fields::Unit => cx.error_spanned_by( + fields, + "#[serde(default)] can only be used on structs with named fields", + ), + }, + syn::Data::Enum(syn::DataEnum { enum_token, .. }) => cx.error_spanned_by( + enum_token, + "#[serde(default)] can only be used on structs with named fields", + ), + syn::Data::Union(syn::DataUnion { union_token, .. }) => cx.error_spanned_by( + union_token, + "#[serde(default)] can only be used on structs with named fields", + ), + }, + + // Parse `#[serde(default = "...")]` + Meta(NameValue(m)) if m.path == DEFAULT => { + if let Ok(path) = parse_lit_into_expr_path(cx, DEFAULT, &m.lit) { + match &item.data { + syn::Data::Struct(syn::DataStruct { fields, .. }) => { + match fields { + syn::Fields::Named(_) => { + default.set(&m.path, Default::Path(path)); + } + syn::Fields::Unnamed(_) | syn::Fields::Unit => cx + .error_spanned_by( + fields, + "#[serde(default = \"...\")] can only be used on structs with named fields", + ), + } + } + syn::Data::Enum(syn::DataEnum { enum_token, .. }) => cx + .error_spanned_by( + enum_token, + "#[serde(default = \"...\")] can only be used on structs with named fields", + ), + syn::Data::Union(syn::DataUnion { + union_token, .. + }) => cx.error_spanned_by( + union_token, + "#[serde(default = \"...\")] can only be used on structs with named fields", + ), + } + } + } + + // Parse `#[serde(bound = "T: SomeBound")]` + Meta(NameValue(m)) if m.path == BOUND => { + if let Ok(where_predicates) = parse_lit_into_where(cx, BOUND, BOUND, &m.lit) { + ser_bound.set(&m.path, where_predicates.clone()); + de_bound.set(&m.path, where_predicates); + } + } + + // Parse `#[serde(bound(serialize = "...", deserialize = "..."))]` + Meta(List(m)) if m.path == BOUND => { + if let Ok((ser, de)) = get_where_predicates(cx, &m.nested) { + ser_bound.set_opt(&m.path, ser); + de_bound.set_opt(&m.path, de); + } + } + + // Parse `#[serde(untagged)]` + Meta(Path(word)) if word == UNTAGGED => match item.data { + syn::Data::Enum(_) => { + untagged.set_true(word); + } + syn::Data::Struct(syn::DataStruct { struct_token, .. }) => { + cx.error_spanned_by( + struct_token, + "#[serde(untagged)] can only be used on enums", + ); + } + syn::Data::Union(syn::DataUnion { union_token, .. }) => { + cx.error_spanned_by( + union_token, + "#[serde(untagged)] can only be used on enums", + ); + } + }, + + // Parse `#[serde(tag = "type")]` + Meta(NameValue(m)) if m.path == TAG => { + if let Ok(s) = get_lit_str(cx, TAG, &m.lit) { + match &item.data { + syn::Data::Enum(_) => { + internal_tag.set(&m.path, s.value()); + } + syn::Data::Struct(syn::DataStruct { fields, .. }) => match fields { + syn::Fields::Named(_) => { + internal_tag.set(&m.path, s.value()); + } + syn::Fields::Unnamed(_) | syn::Fields::Unit => { + cx.error_spanned_by( + fields, + "#[serde(tag = \"...\")] can only be used on enums and structs with named fields", + ); + } + }, + syn::Data::Union(syn::DataUnion { union_token, .. }) => { + cx.error_spanned_by( + union_token, + "#[serde(tag = \"...\")] can only be used on enums and structs with named fields", + ); + } + } + } + } + + // Parse `#[serde(content = "c")]` + Meta(NameValue(m)) if m.path == CONTENT => { + if let Ok(s) = get_lit_str(cx, CONTENT, &m.lit) { + match &item.data { + syn::Data::Enum(_) => { + content.set(&m.path, s.value()); + } + syn::Data::Struct(syn::DataStruct { struct_token, .. }) => { + cx.error_spanned_by( + struct_token, + "#[serde(content = \"...\")] can only be used on enums", + ); + } + syn::Data::Union(syn::DataUnion { union_token, .. }) => { + cx.error_spanned_by( + union_token, + "#[serde(content = \"...\")] can only be used on enums", + ); + } + } + } + } + + // Parse `#[serde(from = "Type")] + Meta(NameValue(m)) if m.path == FROM => { + if let Ok(from_ty) = parse_lit_into_ty(cx, FROM, &m.lit) { + type_from.set_opt(&m.path, Some(from_ty)); + } + } + + // Parse `#[serde(try_from = "Type")] + Meta(NameValue(m)) if m.path == TRY_FROM => { + if let Ok(try_from_ty) = parse_lit_into_ty(cx, TRY_FROM, &m.lit) { + type_try_from.set_opt(&m.path, Some(try_from_ty)); + } + } + + // Parse `#[serde(into = "Type")] + Meta(NameValue(m)) if m.path == INTO => { + if let Ok(into_ty) = parse_lit_into_ty(cx, INTO, &m.lit) { + type_into.set_opt(&m.path, Some(into_ty)); + } + } + + // Parse `#[serde(remote = "...")]` + Meta(NameValue(m)) if m.path == REMOTE => { + if let Ok(path) = parse_lit_into_path(cx, REMOTE, &m.lit) { + if is_primitive_path(&path, "Self") { + remote.set(&m.path, item.ident.clone().into()); + } else { + remote.set(&m.path, path); + } + } + } + + // Parse `#[serde(field_identifier)]` + Meta(Path(word)) if word == FIELD_IDENTIFIER => { + field_identifier.set_true(word); + } + + // Parse `#[serde(variant_identifier)]` + Meta(Path(word)) if word == VARIANT_IDENTIFIER => { + variant_identifier.set_true(word); + } + + // Parse `#[serde(crate = "foo")]` + Meta(NameValue(m)) if m.path == CRATE => { + if let Ok(path) = parse_lit_into_path(cx, CRATE, &m.lit) { + serde_path.set(&m.path, path); + } + } + + // Parse `#[serde(expecting = "a message")]` + Meta(NameValue(m)) if m.path == EXPECTING => { + if let Ok(s) = get_lit_str(cx, EXPECTING, &m.lit) { + expecting.set(&m.path, s.value()); + } + } + + Meta(meta_item) => { + let path = meta_item + .path() + .into_token_stream() + .to_string() + .replace(' ', ""); + cx.error_spanned_by( + meta_item.path(), + format!("unknown serde container attribute `{}`", path), + ); + } + + Lit(lit) => { + cx.error_spanned_by(lit, "unexpected literal in serde container attribute"); + } + } + } + + let mut is_packed = false; + for attr in &item.attrs { + if attr.path.is_ident("repr") { + let _ = attr.parse_args_with(|input: ParseStream| { + while let Some(token) = input.parse()? { + if let TokenTree::Ident(ident) = token { + is_packed |= ident == "packed"; + } + } + Ok(()) + }); + } + } + + Container { + name: Name::from_attrs(unraw(&item.ident), ser_name, de_name, None), + transparent: transparent.get(), + deny_unknown_fields: deny_unknown_fields.get(), + default: default.get().unwrap_or(Default::None), + rename_all_rules: RenameAllRules { + serialize: rename_all_ser_rule.get().unwrap_or(RenameRule::None), + deserialize: rename_all_de_rule.get().unwrap_or(RenameRule::None), + }, + ser_bound: ser_bound.get(), + de_bound: de_bound.get(), + tag: decide_tag(cx, item, untagged, internal_tag, content), + type_from: type_from.get(), + type_try_from: type_try_from.get(), + type_into: type_into.get(), + remote: remote.get(), + identifier: decide_identifier(cx, item, field_identifier, variant_identifier), + has_flatten: false, + serde_path: serde_path.get(), + is_packed, + expecting: expecting.get(), + } + } + + pub fn name(&self) -> &Name { + &self.name + } + + pub fn rename_all_rules(&self) -> &RenameAllRules { + &self.rename_all_rules + } + + pub fn transparent(&self) -> bool { + self.transparent + } + + pub fn deny_unknown_fields(&self) -> bool { + self.deny_unknown_fields + } + + pub fn default(&self) -> &Default { + &self.default + } + + pub fn ser_bound(&self) -> Option<&[syn::WherePredicate]> { + self.ser_bound.as_ref().map(|vec| &vec[..]) + } + + pub fn de_bound(&self) -> Option<&[syn::WherePredicate]> { + self.de_bound.as_ref().map(|vec| &vec[..]) + } + + pub fn tag(&self) -> &TagType { + &self.tag + } + + pub fn type_from(&self) -> Option<&syn::Type> { + self.type_from.as_ref() + } + + pub fn type_try_from(&self) -> Option<&syn::Type> { + self.type_try_from.as_ref() + } + + pub fn type_into(&self) -> Option<&syn::Type> { + self.type_into.as_ref() + } + + pub fn remote(&self) -> Option<&syn::Path> { + self.remote.as_ref() + } + + pub fn is_packed(&self) -> bool { + self.is_packed + } + + pub fn identifier(&self) -> Identifier { + self.identifier + } + + pub fn has_flatten(&self) -> bool { + self.has_flatten + } + + pub fn mark_has_flatten(&mut self) { + self.has_flatten = true; + } + + pub fn custom_serde_path(&self) -> Option<&syn::Path> { + self.serde_path.as_ref() + } + + pub fn serde_path(&self) -> Cow<syn::Path> { + self.custom_serde_path() + .map_or_else(|| Cow::Owned(parse_quote!(_serde)), Cow::Borrowed) + } + + /// Error message generated when type can't be deserialized. + /// If `None`, default message will be used + pub fn expecting(&self) -> Option<&str> { + self.expecting.as_ref().map(String::as_ref) + } +} + +fn decide_tag( + cx: &Ctxt, + item: &syn::DeriveInput, + untagged: BoolAttr, + internal_tag: Attr<String>, + content: Attr<String>, +) -> TagType { + match ( + untagged.0.get_with_tokens(), + internal_tag.get_with_tokens(), + content.get_with_tokens(), + ) { + (None, None, None) => TagType::External, + (Some(_), None, None) => TagType::None, + (None, Some((_, tag)), None) => { + // Check that there are no tuple variants. + if let syn::Data::Enum(data) = &item.data { + for variant in &data.variants { + match &variant.fields { + syn::Fields::Named(_) | syn::Fields::Unit => {} + syn::Fields::Unnamed(fields) => { + if fields.unnamed.len() != 1 { + cx.error_spanned_by( + variant, + "#[serde(tag = \"...\")] cannot be used with tuple variants", + ); + break; + } + } + } + } + } + TagType::Internal { tag } + } + (Some((untagged_tokens, _)), Some((tag_tokens, _)), None) => { + cx.error_spanned_by( + untagged_tokens, + "enum cannot be both untagged and internally tagged", + ); + cx.error_spanned_by( + tag_tokens, + "enum cannot be both untagged and internally tagged", + ); + TagType::External // doesn't matter, will error + } + (None, None, Some((content_tokens, _))) => { + cx.error_spanned_by( + content_tokens, + "#[serde(tag = \"...\", content = \"...\")] must be used together", + ); + TagType::External + } + (Some((untagged_tokens, _)), None, Some((content_tokens, _))) => { + cx.error_spanned_by( + untagged_tokens, + "untagged enum cannot have #[serde(content = \"...\")]", + ); + cx.error_spanned_by( + content_tokens, + "untagged enum cannot have #[serde(content = \"...\")]", + ); + TagType::External + } + (None, Some((_, tag)), Some((_, content))) => TagType::Adjacent { tag, content }, + (Some((untagged_tokens, _)), Some((tag_tokens, _)), Some((content_tokens, _))) => { + cx.error_spanned_by( + untagged_tokens, + "untagged enum cannot have #[serde(tag = \"...\", content = \"...\")]", + ); + cx.error_spanned_by( + tag_tokens, + "untagged enum cannot have #[serde(tag = \"...\", content = \"...\")]", + ); + cx.error_spanned_by( + content_tokens, + "untagged enum cannot have #[serde(tag = \"...\", content = \"...\")]", + ); + TagType::External + } + } +} + +fn decide_identifier( + cx: &Ctxt, + item: &syn::DeriveInput, + field_identifier: BoolAttr, + variant_identifier: BoolAttr, +) -> Identifier { + match ( + &item.data, + field_identifier.0.get_with_tokens(), + variant_identifier.0.get_with_tokens(), + ) { + (_, None, None) => Identifier::No, + (_, Some((field_identifier_tokens, _)), Some((variant_identifier_tokens, _))) => { + cx.error_spanned_by( + field_identifier_tokens, + "#[serde(field_identifier)] and #[serde(variant_identifier)] cannot both be set", + ); + cx.error_spanned_by( + variant_identifier_tokens, + "#[serde(field_identifier)] and #[serde(variant_identifier)] cannot both be set", + ); + Identifier::No + } + (syn::Data::Enum(_), Some(_), None) => Identifier::Field, + (syn::Data::Enum(_), None, Some(_)) => Identifier::Variant, + (syn::Data::Struct(syn::DataStruct { struct_token, .. }), Some(_), None) => { + cx.error_spanned_by( + struct_token, + "#[serde(field_identifier)] can only be used on an enum", + ); + Identifier::No + } + (syn::Data::Union(syn::DataUnion { union_token, .. }), Some(_), None) => { + cx.error_spanned_by( + union_token, + "#[serde(field_identifier)] can only be used on an enum", + ); + Identifier::No + } + (syn::Data::Struct(syn::DataStruct { struct_token, .. }), None, Some(_)) => { + cx.error_spanned_by( + struct_token, + "#[serde(variant_identifier)] can only be used on an enum", + ); + Identifier::No + } + (syn::Data::Union(syn::DataUnion { union_token, .. }), None, Some(_)) => { + cx.error_spanned_by( + union_token, + "#[serde(variant_identifier)] can only be used on an enum", + ); + Identifier::No + } + } +} + +/// Represents variant attribute information +pub struct Variant { + name: Name, + rename_all_rules: RenameAllRules, + ser_bound: Option<Vec<syn::WherePredicate>>, + de_bound: Option<Vec<syn::WherePredicate>>, + skip_deserializing: bool, + skip_serializing: bool, + other: bool, + serialize_with: Option<syn::ExprPath>, + deserialize_with: Option<syn::ExprPath>, + borrow: Option<syn::Meta>, +} + +impl Variant { + pub fn from_ast(cx: &Ctxt, variant: &syn::Variant) -> Self { + let mut ser_name = Attr::none(cx, RENAME); + let mut de_name = Attr::none(cx, RENAME); + let mut de_aliases = VecAttr::none(cx, RENAME); + let mut skip_deserializing = BoolAttr::none(cx, SKIP_DESERIALIZING); + let mut skip_serializing = BoolAttr::none(cx, SKIP_SERIALIZING); + let mut rename_all_ser_rule = Attr::none(cx, RENAME_ALL); + let mut rename_all_de_rule = Attr::none(cx, RENAME_ALL); + let mut ser_bound = Attr::none(cx, BOUND); + let mut de_bound = Attr::none(cx, BOUND); + let mut other = BoolAttr::none(cx, OTHER); + let mut serialize_with = Attr::none(cx, SERIALIZE_WITH); + let mut deserialize_with = Attr::none(cx, DESERIALIZE_WITH); + let mut borrow = Attr::none(cx, BORROW); + + for meta_item in variant + .attrs + .iter() + .flat_map(|attr| get_serde_meta_items(cx, attr)) + .flatten() + { + match &meta_item { + // Parse `#[serde(rename = "foo")]` + Meta(NameValue(m)) if m.path == RENAME => { + if let Ok(s) = get_lit_str(cx, RENAME, &m.lit) { + ser_name.set(&m.path, s.value()); + de_name.set_if_none(s.value()); + de_aliases.insert(&m.path, s.value()); + } + } + + // Parse `#[serde(rename(serialize = "foo", deserialize = "bar"))]` + Meta(List(m)) if m.path == RENAME => { + if let Ok((ser, de)) = get_multiple_renames(cx, &m.nested) { + ser_name.set_opt(&m.path, ser.map(syn::LitStr::value)); + for de_value in de { + de_name.set_if_none(de_value.value()); + de_aliases.insert(&m.path, de_value.value()); + } + } + } + + // Parse `#[serde(alias = "foo")]` + Meta(NameValue(m)) if m.path == ALIAS => { + if let Ok(s) = get_lit_str(cx, ALIAS, &m.lit) { + de_aliases.insert(&m.path, s.value()); + } + } + + // Parse `#[serde(rename_all = "foo")]` + Meta(NameValue(m)) if m.path == RENAME_ALL => { + if let Ok(s) = get_lit_str(cx, RENAME_ALL, &m.lit) { + match RenameRule::from_str(&s.value()) { + Ok(rename_rule) => { + rename_all_ser_rule.set(&m.path, rename_rule); + rename_all_de_rule.set(&m.path, rename_rule); + } + Err(err) => cx.error_spanned_by(s, err), + } + } + } + + // Parse `#[serde(rename_all(serialize = "foo", deserialize = "bar"))]` + Meta(List(m)) if m.path == RENAME_ALL => { + if let Ok((ser, de)) = get_renames(cx, &m.nested) { + if let Some(ser) = ser { + match RenameRule::from_str(&ser.value()) { + Ok(rename_rule) => rename_all_ser_rule.set(&m.path, rename_rule), + Err(err) => cx.error_spanned_by(ser, err), + } + } + if let Some(de) = de { + match RenameRule::from_str(&de.value()) { + Ok(rename_rule) => rename_all_de_rule.set(&m.path, rename_rule), + Err(err) => cx.error_spanned_by(de, err), + } + } + } + } + + // Parse `#[serde(skip)]` + Meta(Path(word)) if word == SKIP => { + skip_serializing.set_true(word); + skip_deserializing.set_true(word); + } + + // Parse `#[serde(skip_deserializing)]` + Meta(Path(word)) if word == SKIP_DESERIALIZING => { + skip_deserializing.set_true(word); + } + + // Parse `#[serde(skip_serializing)]` + Meta(Path(word)) if word == SKIP_SERIALIZING => { + skip_serializing.set_true(word); + } + + // Parse `#[serde(other)]` + Meta(Path(word)) if word == OTHER => { + other.set_true(word); + } + + // Parse `#[serde(bound = "T: SomeBound")]` + Meta(NameValue(m)) if m.path == BOUND => { + if let Ok(where_predicates) = parse_lit_into_where(cx, BOUND, BOUND, &m.lit) { + ser_bound.set(&m.path, where_predicates.clone()); + de_bound.set(&m.path, where_predicates); + } + } + + // Parse `#[serde(bound(serialize = "...", deserialize = "..."))]` + Meta(List(m)) if m.path == BOUND => { + if let Ok((ser, de)) = get_where_predicates(cx, &m.nested) { + ser_bound.set_opt(&m.path, ser); + de_bound.set_opt(&m.path, de); + } + } + + // Parse `#[serde(with = "...")]` + Meta(NameValue(m)) if m.path == WITH => { + if let Ok(path) = parse_lit_into_expr_path(cx, WITH, &m.lit) { + let mut ser_path = path.clone(); + ser_path + .path + .segments + .push(Ident::new("serialize", Span::call_site()).into()); + serialize_with.set(&m.path, ser_path); + let mut de_path = path; + de_path + .path + .segments + .push(Ident::new("deserialize", Span::call_site()).into()); + deserialize_with.set(&m.path, de_path); + } + } + + // Parse `#[serde(serialize_with = "...")]` + Meta(NameValue(m)) if m.path == SERIALIZE_WITH => { + if let Ok(path) = parse_lit_into_expr_path(cx, SERIALIZE_WITH, &m.lit) { + serialize_with.set(&m.path, path); + } + } + + // Parse `#[serde(deserialize_with = "...")]` + Meta(NameValue(m)) if m.path == DESERIALIZE_WITH => { + if let Ok(path) = parse_lit_into_expr_path(cx, DESERIALIZE_WITH, &m.lit) { + deserialize_with.set(&m.path, path); + } + } + + // Defer `#[serde(borrow)]` and `#[serde(borrow = "'a + 'b")]` + Meta(m) if m.path() == BORROW => match &variant.fields { + syn::Fields::Unnamed(fields) if fields.unnamed.len() == 1 => { + borrow.set(m.path(), m.clone()); + } + _ => { + cx.error_spanned_by( + variant, + "#[serde(borrow)] may only be used on newtype variants", + ); + } + }, + + Meta(meta_item) => { + let path = meta_item + .path() + .into_token_stream() + .to_string() + .replace(' ', ""); + cx.error_spanned_by( + meta_item.path(), + format!("unknown serde variant attribute `{}`", path), + ); + } + + Lit(lit) => { + cx.error_spanned_by(lit, "unexpected literal in serde variant attribute"); + } + } + } + + Variant { + name: Name::from_attrs(unraw(&variant.ident), ser_name, de_name, Some(de_aliases)), + rename_all_rules: RenameAllRules { + serialize: rename_all_ser_rule.get().unwrap_or(RenameRule::None), + deserialize: rename_all_de_rule.get().unwrap_or(RenameRule::None), + }, + ser_bound: ser_bound.get(), + de_bound: de_bound.get(), + skip_deserializing: skip_deserializing.get(), + skip_serializing: skip_serializing.get(), + other: other.get(), + serialize_with: serialize_with.get(), + deserialize_with: deserialize_with.get(), + borrow: borrow.get(), + } + } + + pub fn name(&self) -> &Name { + &self.name + } + + pub fn aliases(&self) -> Vec<String> { + self.name.deserialize_aliases() + } + + pub fn rename_by_rules(&mut self, rules: &RenameAllRules) { + if !self.name.serialize_renamed { + self.name.serialize = rules.serialize.apply_to_variant(&self.name.serialize); + } + if !self.name.deserialize_renamed { + self.name.deserialize = rules.deserialize.apply_to_variant(&self.name.deserialize); + } + } + + pub fn rename_all_rules(&self) -> &RenameAllRules { + &self.rename_all_rules + } + + pub fn ser_bound(&self) -> Option<&[syn::WherePredicate]> { + self.ser_bound.as_ref().map(|vec| &vec[..]) + } + + pub fn de_bound(&self) -> Option<&[syn::WherePredicate]> { + self.de_bound.as_ref().map(|vec| &vec[..]) + } + + pub fn skip_deserializing(&self) -> bool { + self.skip_deserializing + } + + pub fn skip_serializing(&self) -> bool { + self.skip_serializing + } + + pub fn other(&self) -> bool { + self.other + } + + pub fn serialize_with(&self) -> Option<&syn::ExprPath> { + self.serialize_with.as_ref() + } + + pub fn deserialize_with(&self) -> Option<&syn::ExprPath> { + self.deserialize_with.as_ref() + } +} + +/// Represents field attribute information +pub struct Field { + name: Name, + skip_serializing: bool, + skip_deserializing: bool, + skip_serializing_if: Option<syn::ExprPath>, + default: Default, + serialize_with: Option<syn::ExprPath>, + deserialize_with: Option<syn::ExprPath>, + ser_bound: Option<Vec<syn::WherePredicate>>, + de_bound: Option<Vec<syn::WherePredicate>>, + borrowed_lifetimes: BTreeSet<syn::Lifetime>, + getter: Option<syn::ExprPath>, + flatten: bool, + transparent: bool, +} + +/// Represents the default to use for a field when deserializing. +pub enum Default { + /// Field must always be specified because it does not have a default. + None, + /// The default is given by `std::default::Default::default()`. + Default, + /// The default is given by this function. + Path(syn::ExprPath), +} + +impl Default { + pub fn is_none(&self) -> bool { + match self { + Default::None => true, + Default::Default | Default::Path(_) => false, + } + } +} + +impl Field { + /// Extract out the `#[serde(...)]` attributes from a struct field. + pub fn from_ast( + cx: &Ctxt, + index: usize, + field: &syn::Field, + attrs: Option<&Variant>, + container_default: &Default, + ) -> Self { + let mut ser_name = Attr::none(cx, RENAME); + let mut de_name = Attr::none(cx, RENAME); + let mut de_aliases = VecAttr::none(cx, RENAME); + let mut skip_serializing = BoolAttr::none(cx, SKIP_SERIALIZING); + let mut skip_deserializing = BoolAttr::none(cx, SKIP_DESERIALIZING); + let mut skip_serializing_if = Attr::none(cx, SKIP_SERIALIZING_IF); + let mut default = Attr::none(cx, DEFAULT); + let mut serialize_with = Attr::none(cx, SERIALIZE_WITH); + let mut deserialize_with = Attr::none(cx, DESERIALIZE_WITH); + let mut ser_bound = Attr::none(cx, BOUND); + let mut de_bound = Attr::none(cx, BOUND); + let mut borrowed_lifetimes = Attr::none(cx, BORROW); + let mut getter = Attr::none(cx, GETTER); + let mut flatten = BoolAttr::none(cx, FLATTEN); + + let ident = match &field.ident { + Some(ident) => unraw(ident), + None => index.to_string(), + }; + + let variant_borrow = attrs + .and_then(|variant| variant.borrow.as_ref()) + .map(|borrow| Meta(borrow.clone())); + + for meta_item in field + .attrs + .iter() + .flat_map(|attr| get_serde_meta_items(cx, attr)) + .flatten() + .chain(variant_borrow) + { + match &meta_item { + // Parse `#[serde(rename = "foo")]` + Meta(NameValue(m)) if m.path == RENAME => { + if let Ok(s) = get_lit_str(cx, RENAME, &m.lit) { + ser_name.set(&m.path, s.value()); + de_name.set_if_none(s.value()); + de_aliases.insert(&m.path, s.value()); + } + } + + // Parse `#[serde(rename(serialize = "foo", deserialize = "bar"))]` + Meta(List(m)) if m.path == RENAME => { + if let Ok((ser, de)) = get_multiple_renames(cx, &m.nested) { + ser_name.set_opt(&m.path, ser.map(syn::LitStr::value)); + for de_value in de { + de_name.set_if_none(de_value.value()); + de_aliases.insert(&m.path, de_value.value()); + } + } + } + + // Parse `#[serde(alias = "foo")]` + Meta(NameValue(m)) if m.path == ALIAS => { + if let Ok(s) = get_lit_str(cx, ALIAS, &m.lit) { + de_aliases.insert(&m.path, s.value()); + } + } + + // Parse `#[serde(default)]` + Meta(Path(word)) if word == DEFAULT => { + default.set(word, Default::Default); + } + + // Parse `#[serde(default = "...")]` + Meta(NameValue(m)) if m.path == DEFAULT => { + if let Ok(path) = parse_lit_into_expr_path(cx, DEFAULT, &m.lit) { + default.set(&m.path, Default::Path(path)); + } + } + + // Parse `#[serde(skip_serializing)]` + Meta(Path(word)) if word == SKIP_SERIALIZING => { + skip_serializing.set_true(word); + } + + // Parse `#[serde(skip_deserializing)]` + Meta(Path(word)) if word == SKIP_DESERIALIZING => { + skip_deserializing.set_true(word); + } + + // Parse `#[serde(skip)]` + Meta(Path(word)) if word == SKIP => { + skip_serializing.set_true(word); + skip_deserializing.set_true(word); + } + + // Parse `#[serde(skip_serializing_if = "...")]` + Meta(NameValue(m)) if m.path == SKIP_SERIALIZING_IF => { + if let Ok(path) = parse_lit_into_expr_path(cx, SKIP_SERIALIZING_IF, &m.lit) { + skip_serializing_if.set(&m.path, path); + } + } + + // Parse `#[serde(serialize_with = "...")]` + Meta(NameValue(m)) if m.path == SERIALIZE_WITH => { + if let Ok(path) = parse_lit_into_expr_path(cx, SERIALIZE_WITH, &m.lit) { + serialize_with.set(&m.path, path); + } + } + + // Parse `#[serde(deserialize_with = "...")]` + Meta(NameValue(m)) if m.path == DESERIALIZE_WITH => { + if let Ok(path) = parse_lit_into_expr_path(cx, DESERIALIZE_WITH, &m.lit) { + deserialize_with.set(&m.path, path); + } + } + + // Parse `#[serde(with = "...")]` + Meta(NameValue(m)) if m.path == WITH => { + if let Ok(path) = parse_lit_into_expr_path(cx, WITH, &m.lit) { + let mut ser_path = path.clone(); + ser_path + .path + .segments + .push(Ident::new("serialize", Span::call_site()).into()); + serialize_with.set(&m.path, ser_path); + let mut de_path = path; + de_path + .path + .segments + .push(Ident::new("deserialize", Span::call_site()).into()); + deserialize_with.set(&m.path, de_path); + } + } + + // Parse `#[serde(bound = "T: SomeBound")]` + Meta(NameValue(m)) if m.path == BOUND => { + if let Ok(where_predicates) = parse_lit_into_where(cx, BOUND, BOUND, &m.lit) { + ser_bound.set(&m.path, where_predicates.clone()); + de_bound.set(&m.path, where_predicates); + } + } + + // Parse `#[serde(bound(serialize = "...", deserialize = "..."))]` + Meta(List(m)) if m.path == BOUND => { + if let Ok((ser, de)) = get_where_predicates(cx, &m.nested) { + ser_bound.set_opt(&m.path, ser); + de_bound.set_opt(&m.path, de); + } + } + + // Parse `#[serde(borrow)]` + Meta(Path(word)) if word == BORROW => { + if let Ok(borrowable) = borrowable_lifetimes(cx, &ident, field) { + borrowed_lifetimes.set(word, borrowable); + } + } + + // Parse `#[serde(borrow = "'a + 'b")]` + Meta(NameValue(m)) if m.path == BORROW => { + if let Ok(lifetimes) = parse_lit_into_lifetimes(cx, BORROW, &m.lit) { + if let Ok(borrowable) = borrowable_lifetimes(cx, &ident, field) { + for lifetime in &lifetimes { + if !borrowable.contains(lifetime) { + cx.error_spanned_by( + field, + format!( + "field `{}` does not have lifetime {}", + ident, lifetime + ), + ); + } + } + borrowed_lifetimes.set(&m.path, lifetimes); + } + } + } + + // Parse `#[serde(getter = "...")]` + Meta(NameValue(m)) if m.path == GETTER => { + if let Ok(path) = parse_lit_into_expr_path(cx, GETTER, &m.lit) { + getter.set(&m.path, path); + } + } + + // Parse `#[serde(flatten)]` + Meta(Path(word)) if word == FLATTEN => { + flatten.set_true(word); + } + + Meta(meta_item) => { + let path = meta_item + .path() + .into_token_stream() + .to_string() + .replace(' ', ""); + cx.error_spanned_by( + meta_item.path(), + format!("unknown serde field attribute `{}`", path), + ); + } + + Lit(lit) => { + cx.error_spanned_by(lit, "unexpected literal in serde field attribute"); + } + } + } + + // Is skip_deserializing, initialize the field to Default::default() unless a + // different default is specified by `#[serde(default = "...")]` on + // ourselves or our container (e.g. the struct we are in). + if let Default::None = *container_default { + if skip_deserializing.0.value.is_some() { + default.set_if_none(Default::Default); + } + } + + let mut borrowed_lifetimes = borrowed_lifetimes.get().unwrap_or_default(); + if !borrowed_lifetimes.is_empty() { + // Cow<str> and Cow<[u8]> never borrow by default: + // + // impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T> + // + // A #[serde(borrow)] attribute enables borrowing that corresponds + // roughly to these impls: + // + // impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, str> + // impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, [u8]> + if is_cow(&field.ty, is_str) { + let mut path = syn::Path { + leading_colon: None, + segments: Punctuated::new(), + }; + let span = Span::call_site(); + path.segments.push(Ident::new("_serde", span).into()); + path.segments.push(Ident::new("__private", span).into()); + path.segments.push(Ident::new("de", span).into()); + path.segments + .push(Ident::new("borrow_cow_str", span).into()); + let expr = syn::ExprPath { + attrs: Vec::new(), + qself: None, + path, + }; + deserialize_with.set_if_none(expr); + } else if is_cow(&field.ty, is_slice_u8) { + let mut path = syn::Path { + leading_colon: None, + segments: Punctuated::new(), + }; + let span = Span::call_site(); + path.segments.push(Ident::new("_serde", span).into()); + path.segments.push(Ident::new("__private", span).into()); + path.segments.push(Ident::new("de", span).into()); + path.segments + .push(Ident::new("borrow_cow_bytes", span).into()); + let expr = syn::ExprPath { + attrs: Vec::new(), + qself: None, + path, + }; + deserialize_with.set_if_none(expr); + } + } else if is_implicitly_borrowed(&field.ty) { + // Types &str and &[u8] are always implicitly borrowed. No need for + // a #[serde(borrow)]. + collect_lifetimes(&field.ty, &mut borrowed_lifetimes); + } + + Field { + name: Name::from_attrs(ident, ser_name, de_name, Some(de_aliases)), + skip_serializing: skip_serializing.get(), + skip_deserializing: skip_deserializing.get(), + skip_serializing_if: skip_serializing_if.get(), + default: default.get().unwrap_or(Default::None), + serialize_with: serialize_with.get(), + deserialize_with: deserialize_with.get(), + ser_bound: ser_bound.get(), + de_bound: de_bound.get(), + borrowed_lifetimes, + getter: getter.get(), + flatten: flatten.get(), + transparent: false, + } + } + + pub fn name(&self) -> &Name { + &self.name + } + + pub fn aliases(&self) -> Vec<String> { + self.name.deserialize_aliases() + } + + pub fn rename_by_rules(&mut self, rules: &RenameAllRules) { + if !self.name.serialize_renamed { + self.name.serialize = rules.serialize.apply_to_field(&self.name.serialize); + } + if !self.name.deserialize_renamed { + self.name.deserialize = rules.deserialize.apply_to_field(&self.name.deserialize); + } + } + + pub fn skip_serializing(&self) -> bool { + self.skip_serializing + } + + pub fn skip_deserializing(&self) -> bool { + self.skip_deserializing + } + + pub fn skip_serializing_if(&self) -> Option<&syn::ExprPath> { + self.skip_serializing_if.as_ref() + } + + pub fn default(&self) -> &Default { + &self.default + } + + pub fn serialize_with(&self) -> Option<&syn::ExprPath> { + self.serialize_with.as_ref() + } + + pub fn deserialize_with(&self) -> Option<&syn::ExprPath> { + self.deserialize_with.as_ref() + } + + pub fn ser_bound(&self) -> Option<&[syn::WherePredicate]> { + self.ser_bound.as_ref().map(|vec| &vec[..]) + } + + pub fn de_bound(&self) -> Option<&[syn::WherePredicate]> { + self.de_bound.as_ref().map(|vec| &vec[..]) + } + + pub fn borrowed_lifetimes(&self) -> &BTreeSet<syn::Lifetime> { + &self.borrowed_lifetimes + } + + pub fn getter(&self) -> Option<&syn::ExprPath> { + self.getter.as_ref() + } + + pub fn flatten(&self) -> bool { + self.flatten + } + + pub fn transparent(&self) -> bool { + self.transparent + } + + pub fn mark_transparent(&mut self) { + self.transparent = true; + } +} + +type SerAndDe<T> = (Option<T>, Option<T>); + +fn get_ser_and_de<'a, 'b, T, F>( + cx: &'b Ctxt, + attr_name: Symbol, + metas: &'a Punctuated<syn::NestedMeta, Token![,]>, + f: F, +) -> Result<(VecAttr<'b, T>, VecAttr<'b, T>), ()> +where + T: 'a, + F: Fn(&Ctxt, Symbol, Symbol, &'a syn::Lit) -> Result<T, ()>, +{ + let mut ser_meta = VecAttr::none(cx, attr_name); + let mut de_meta = VecAttr::none(cx, attr_name); + + for meta in metas { + match meta { + Meta(NameValue(meta)) if meta.path == SERIALIZE => { + if let Ok(v) = f(cx, attr_name, SERIALIZE, &meta.lit) { + ser_meta.insert(&meta.path, v); + } + } + + Meta(NameValue(meta)) if meta.path == DESERIALIZE => { + if let Ok(v) = f(cx, attr_name, DESERIALIZE, &meta.lit) { + de_meta.insert(&meta.path, v); + } + } + + _ => { + cx.error_spanned_by( + meta, + format!( + "malformed {0} attribute, expected `{0}(serialize = ..., deserialize = ...)`", + attr_name + ), + ); + return Err(()); + } + } + } + + Ok((ser_meta, de_meta)) +} + +fn get_renames<'a>( + cx: &Ctxt, + items: &'a Punctuated<syn::NestedMeta, Token![,]>, +) -> Result<SerAndDe<&'a syn::LitStr>, ()> { + let (ser, de) = get_ser_and_de(cx, RENAME, items, get_lit_str2)?; + Ok((ser.at_most_one()?, de.at_most_one()?)) +} + +fn get_multiple_renames<'a>( + cx: &Ctxt, + items: &'a Punctuated<syn::NestedMeta, Token![,]>, +) -> Result<(Option<&'a syn::LitStr>, Vec<&'a syn::LitStr>), ()> { + let (ser, de) = get_ser_and_de(cx, RENAME, items, get_lit_str2)?; + Ok((ser.at_most_one()?, de.get())) +} + +fn get_where_predicates( + cx: &Ctxt, + items: &Punctuated<syn::NestedMeta, Token![,]>, +) -> Result<SerAndDe<Vec<syn::WherePredicate>>, ()> { + let (ser, de) = get_ser_and_de(cx, BOUND, items, parse_lit_into_where)?; + Ok((ser.at_most_one()?, de.at_most_one()?)) +} + +pub fn get_serde_meta_items(cx: &Ctxt, attr: &syn::Attribute) -> Result<Vec<syn::NestedMeta>, ()> { + if attr.path != SERDE { + return Ok(Vec::new()); + } + + match attr.parse_meta() { + Ok(List(meta)) => Ok(meta.nested.into_iter().collect()), + Ok(other) => { + cx.error_spanned_by(other, "expected #[serde(...)]"); + Err(()) + } + Err(err) => { + cx.syn_error(err); + Err(()) + } + } +} + +fn get_lit_str<'a>(cx: &Ctxt, attr_name: Symbol, lit: &'a syn::Lit) -> Result<&'a syn::LitStr, ()> { + get_lit_str2(cx, attr_name, attr_name, lit) +} + +fn get_lit_str2<'a>( + cx: &Ctxt, + attr_name: Symbol, + meta_item_name: Symbol, + lit: &'a syn::Lit, +) -> Result<&'a syn::LitStr, ()> { + if let syn::Lit::Str(lit) = lit { + Ok(lit) + } else { + cx.error_spanned_by( + lit, + format!( + "expected serde {} attribute to be a string: `{} = \"...\"`", + attr_name, meta_item_name + ), + ); + Err(()) + } +} + +fn parse_lit_into_path(cx: &Ctxt, attr_name: Symbol, lit: &syn::Lit) -> Result<syn::Path, ()> { + let string = get_lit_str(cx, attr_name, lit)?; + parse_lit_str(string).map_err(|_| { + cx.error_spanned_by(lit, format!("failed to parse path: {:?}", string.value())); + }) +} + +fn parse_lit_into_expr_path( + cx: &Ctxt, + attr_name: Symbol, + lit: &syn::Lit, +) -> Result<syn::ExprPath, ()> { + let string = get_lit_str(cx, attr_name, lit)?; + parse_lit_str(string).map_err(|_| { + cx.error_spanned_by(lit, format!("failed to parse path: {:?}", string.value())); + }) +} + +fn parse_lit_into_where( + cx: &Ctxt, + attr_name: Symbol, + meta_item_name: Symbol, + lit: &syn::Lit, +) -> Result<Vec<syn::WherePredicate>, ()> { + let string = get_lit_str2(cx, attr_name, meta_item_name, lit)?; + if string.value().is_empty() { + return Ok(Vec::new()); + } + + let where_string = syn::LitStr::new(&format!("where {}", string.value()), string.span()); + + parse_lit_str::<syn::WhereClause>(&where_string) + .map(|wh| wh.predicates.into_iter().collect()) + .map_err(|err| cx.error_spanned_by(lit, err)) +} + +fn parse_lit_into_ty(cx: &Ctxt, attr_name: Symbol, lit: &syn::Lit) -> Result<syn::Type, ()> { + let string = get_lit_str(cx, attr_name, lit)?; + + parse_lit_str(string).map_err(|_| { + cx.error_spanned_by( + lit, + format!("failed to parse type: {} = {:?}", attr_name, string.value()), + ); + }) +} + +// Parses a string literal like "'a + 'b + 'c" containing a nonempty list of +// lifetimes separated by `+`. +fn parse_lit_into_lifetimes( + cx: &Ctxt, + attr_name: Symbol, + lit: &syn::Lit, +) -> Result<BTreeSet<syn::Lifetime>, ()> { + let string = get_lit_str(cx, attr_name, lit)?; + if string.value().is_empty() { + cx.error_spanned_by(lit, "at least one lifetime must be borrowed"); + return Err(()); + } + + struct BorrowedLifetimes(Punctuated<syn::Lifetime, Token![+]>); + + impl Parse for BorrowedLifetimes { + fn parse(input: ParseStream) -> parse::Result<Self> { + Punctuated::parse_separated_nonempty(input).map(BorrowedLifetimes) + } + } + + if let Ok(BorrowedLifetimes(lifetimes)) = parse_lit_str(string) { + let mut set = BTreeSet::new(); + for lifetime in lifetimes { + if !set.insert(lifetime.clone()) { + cx.error_spanned_by(lit, format!("duplicate borrowed lifetime `{}`", lifetime)); + } + } + return Ok(set); + } + + cx.error_spanned_by( + lit, + format!("failed to parse borrowed lifetimes: {:?}", string.value()), + ); + Err(()) +} + +fn is_implicitly_borrowed(ty: &syn::Type) -> bool { + is_implicitly_borrowed_reference(ty) || is_option(ty, is_implicitly_borrowed_reference) +} + +fn is_implicitly_borrowed_reference(ty: &syn::Type) -> bool { + is_reference(ty, is_str) || is_reference(ty, is_slice_u8) +} + +// Whether the type looks like it might be `std::borrow::Cow<T>` where elem="T". +// This can have false negatives and false positives. +// +// False negative: +// +// use std::borrow::Cow as Pig; +// +// #[derive(Deserialize)] +// struct S<'a> { +// #[serde(borrow)] +// pig: Pig<'a, str>, +// } +// +// False positive: +// +// type str = [i16]; +// +// #[derive(Deserialize)] +// struct S<'a> { +// #[serde(borrow)] +// cow: Cow<'a, str>, +// } +fn is_cow(ty: &syn::Type, elem: fn(&syn::Type) -> bool) -> bool { + let path = match ungroup(ty) { + syn::Type::Path(ty) => &ty.path, + _ => { + return false; + } + }; + let seg = match path.segments.last() { + Some(seg) => seg, + None => { + return false; + } + }; + let args = match &seg.arguments { + syn::PathArguments::AngleBracketed(bracketed) => &bracketed.args, + _ => { + return false; + } + }; + seg.ident == "Cow" + && args.len() == 2 + && match (&args[0], &args[1]) { + (syn::GenericArgument::Lifetime(_), syn::GenericArgument::Type(arg)) => elem(arg), + _ => false, + } +} + +fn is_option(ty: &syn::Type, elem: fn(&syn::Type) -> bool) -> bool { + let path = match ungroup(ty) { + syn::Type::Path(ty) => &ty.path, + _ => { + return false; + } + }; + let seg = match path.segments.last() { + Some(seg) => seg, + None => { + return false; + } + }; + let args = match &seg.arguments { + syn::PathArguments::AngleBracketed(bracketed) => &bracketed.args, + _ => { + return false; + } + }; + seg.ident == "Option" + && args.len() == 1 + && match &args[0] { + syn::GenericArgument::Type(arg) => elem(arg), + _ => false, + } +} + +// Whether the type looks like it might be `&T` where elem="T". This can have +// false negatives and false positives. +// +// False negative: +// +// type Yarn = str; +// +// #[derive(Deserialize)] +// struct S<'a> { +// r: &'a Yarn, +// } +// +// False positive: +// +// type str = [i16]; +// +// #[derive(Deserialize)] +// struct S<'a> { +// r: &'a str, +// } +fn is_reference(ty: &syn::Type, elem: fn(&syn::Type) -> bool) -> bool { + match ungroup(ty) { + syn::Type::Reference(ty) => ty.mutability.is_none() && elem(&ty.elem), + _ => false, + } +} + +fn is_str(ty: &syn::Type) -> bool { + is_primitive_type(ty, "str") +} + +fn is_slice_u8(ty: &syn::Type) -> bool { + match ungroup(ty) { + syn::Type::Slice(ty) => is_primitive_type(&ty.elem, "u8"), + _ => false, + } +} + +fn is_primitive_type(ty: &syn::Type, primitive: &str) -> bool { + match ungroup(ty) { + syn::Type::Path(ty) => ty.qself.is_none() && is_primitive_path(&ty.path, primitive), + _ => false, + } +} + +fn is_primitive_path(path: &syn::Path, primitive: &str) -> bool { + path.leading_colon.is_none() + && path.segments.len() == 1 + && path.segments[0].ident == primitive + && path.segments[0].arguments.is_empty() +} + +// All lifetimes that this type could borrow from a Deserializer. +// +// For example a type `S<'a, 'b>` could borrow `'a` and `'b`. On the other hand +// a type `for<'a> fn(&'a str)` could not borrow `'a` from the Deserializer. +// +// This is used when there is an explicit or implicit `#[serde(borrow)]` +// attribute on the field so there must be at least one borrowable lifetime. +fn borrowable_lifetimes( + cx: &Ctxt, + name: &str, + field: &syn::Field, +) -> Result<BTreeSet<syn::Lifetime>, ()> { + let mut lifetimes = BTreeSet::new(); + collect_lifetimes(&field.ty, &mut lifetimes); + if lifetimes.is_empty() { + cx.error_spanned_by( + field, + format!("field `{}` has no lifetimes to borrow", name), + ); + Err(()) + } else { + Ok(lifetimes) + } +} + +fn collect_lifetimes(ty: &syn::Type, out: &mut BTreeSet<syn::Lifetime>) { + match ty { + syn::Type::Slice(ty) => { + collect_lifetimes(&ty.elem, out); + } + syn::Type::Array(ty) => { + collect_lifetimes(&ty.elem, out); + } + syn::Type::Ptr(ty) => { + collect_lifetimes(&ty.elem, out); + } + syn::Type::Reference(ty) => { + out.extend(ty.lifetime.iter().cloned()); + collect_lifetimes(&ty.elem, out); + } + syn::Type::Tuple(ty) => { + for elem in &ty.elems { + collect_lifetimes(elem, out); + } + } + syn::Type::Path(ty) => { + if let Some(qself) = &ty.qself { + collect_lifetimes(&qself.ty, out); + } + for seg in &ty.path.segments { + if let syn::PathArguments::AngleBracketed(bracketed) = &seg.arguments { + for arg in &bracketed.args { + match arg { + syn::GenericArgument::Lifetime(lifetime) => { + out.insert(lifetime.clone()); + } + syn::GenericArgument::Type(ty) => { + collect_lifetimes(ty, out); + } + syn::GenericArgument::Binding(binding) => { + collect_lifetimes(&binding.ty, out); + } + syn::GenericArgument::Constraint(_) + | syn::GenericArgument::Const(_) => {} + } + } + } + } + } + syn::Type::Paren(ty) => { + collect_lifetimes(&ty.elem, out); + } + syn::Type::Group(ty) => { + collect_lifetimes(&ty.elem, out); + } + syn::Type::Macro(ty) => { + collect_lifetimes_from_tokens(ty.mac.tokens.clone(), out); + } + syn::Type::BareFn(_) + | syn::Type::Never(_) + | syn::Type::TraitObject(_) + | syn::Type::ImplTrait(_) + | syn::Type::Infer(_) + | syn::Type::Verbatim(_) => {} + + #[cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + _ => {} + } +} + +fn collect_lifetimes_from_tokens(tokens: TokenStream, out: &mut BTreeSet<syn::Lifetime>) { + let mut iter = tokens.into_iter(); + while let Some(tt) = iter.next() { + match &tt { + TokenTree::Punct(op) if op.as_char() == '\'' && op.spacing() == Spacing::Joint => { + if let Some(TokenTree::Ident(ident)) = iter.next() { + out.insert(syn::Lifetime { + apostrophe: op.span(), + ident, + }); + } + } + TokenTree::Group(group) => { + let tokens = group.stream(); + collect_lifetimes_from_tokens(tokens, out); + } + _ => {} + } + } +} + +fn parse_lit_str<T>(s: &syn::LitStr) -> parse::Result<T> +where + T: Parse, +{ + let tokens = spanned_tokens(s)?; + syn::parse2(tokens) +} + +fn spanned_tokens(s: &syn::LitStr) -> parse::Result<TokenStream> { + let stream = syn::parse_str(&s.value())?; + Ok(respan(stream, s.span())) +} diff --git a/vendor/serde_derive/src/internals/case.rs b/vendor/serde_derive/src/internals/case.rs new file mode 100644 index 000000000..554505160 --- /dev/null +++ b/vendor/serde_derive/src/internals/case.rs @@ -0,0 +1,197 @@ +//! Code to convert the Rust-styled field/variant (e.g. `my_field`, `MyType`) to the +//! case of the source (e.g. `my-field`, `MY_FIELD`). + +// See https://users.rust-lang.org/t/psa-dealing-with-warning-unused-import-std-ascii-asciiext-in-today-s-nightly/13726 +#[allow(deprecated, unused_imports)] +use std::ascii::AsciiExt; + +use std::fmt::{self, Debug, Display}; + +use self::RenameRule::*; + +/// The different possible ways to change case of fields in a struct, or variants in an enum. +#[derive(Copy, Clone, PartialEq)] +pub enum RenameRule { + /// Don't apply a default rename rule. + None, + /// Rename direct children to "lowercase" style. + LowerCase, + /// Rename direct children to "UPPERCASE" style. + UpperCase, + /// Rename direct children to "PascalCase" style, as typically used for + /// enum variants. + PascalCase, + /// Rename direct children to "camelCase" style. + CamelCase, + /// Rename direct children to "snake_case" style, as commonly used for + /// fields. + SnakeCase, + /// Rename direct children to "SCREAMING_SNAKE_CASE" style, as commonly + /// used for constants. + ScreamingSnakeCase, + /// Rename direct children to "kebab-case" style. + KebabCase, + /// Rename direct children to "SCREAMING-KEBAB-CASE" style. + ScreamingKebabCase, +} + +static RENAME_RULES: &[(&str, RenameRule)] = &[ + ("lowercase", LowerCase), + ("UPPERCASE", UpperCase), + ("PascalCase", PascalCase), + ("camelCase", CamelCase), + ("snake_case", SnakeCase), + ("SCREAMING_SNAKE_CASE", ScreamingSnakeCase), + ("kebab-case", KebabCase), + ("SCREAMING-KEBAB-CASE", ScreamingKebabCase), +]; + +impl RenameRule { + pub fn from_str(rename_all_str: &str) -> Result<Self, ParseError> { + for (name, rule) in RENAME_RULES { + if rename_all_str == *name { + return Ok(*rule); + } + } + Err(ParseError { + unknown: rename_all_str, + }) + } + + /// Apply a renaming rule to an enum variant, returning the version expected in the source. + pub fn apply_to_variant(&self, variant: &str) -> String { + match *self { + None | PascalCase => variant.to_owned(), + LowerCase => variant.to_ascii_lowercase(), + UpperCase => variant.to_ascii_uppercase(), + CamelCase => variant[..1].to_ascii_lowercase() + &variant[1..], + SnakeCase => { + let mut snake = String::new(); + for (i, ch) in variant.char_indices() { + if i > 0 && ch.is_uppercase() { + snake.push('_'); + } + snake.push(ch.to_ascii_lowercase()); + } + snake + } + ScreamingSnakeCase => SnakeCase.apply_to_variant(variant).to_ascii_uppercase(), + KebabCase => SnakeCase.apply_to_variant(variant).replace('_', "-"), + ScreamingKebabCase => ScreamingSnakeCase + .apply_to_variant(variant) + .replace('_', "-"), + } + } + + /// Apply a renaming rule to a struct field, returning the version expected in the source. + pub fn apply_to_field(&self, field: &str) -> String { + match *self { + None | LowerCase | SnakeCase => field.to_owned(), + UpperCase => field.to_ascii_uppercase(), + PascalCase => { + let mut pascal = String::new(); + let mut capitalize = true; + for ch in field.chars() { + if ch == '_' { + capitalize = true; + } else if capitalize { + pascal.push(ch.to_ascii_uppercase()); + capitalize = false; + } else { + pascal.push(ch); + } + } + pascal + } + CamelCase => { + let pascal = PascalCase.apply_to_field(field); + pascal[..1].to_ascii_lowercase() + &pascal[1..] + } + ScreamingSnakeCase => field.to_ascii_uppercase(), + KebabCase => field.replace('_', "-"), + ScreamingKebabCase => ScreamingSnakeCase.apply_to_field(field).replace('_', "-"), + } + } +} + +pub struct ParseError<'a> { + unknown: &'a str, +} + +impl<'a> Display for ParseError<'a> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.write_str("unknown rename rule `rename_all = ")?; + Debug::fmt(self.unknown, f)?; + f.write_str("`, expected one of ")?; + for (i, (name, _rule)) in RENAME_RULES.iter().enumerate() { + if i > 0 { + f.write_str(", ")?; + } + Debug::fmt(name, f)?; + } + Ok(()) + } +} + +#[test] +fn rename_variants() { + for &(original, lower, upper, camel, snake, screaming, kebab, screaming_kebab) in &[ + ( + "Outcome", "outcome", "OUTCOME", "outcome", "outcome", "OUTCOME", "outcome", "OUTCOME", + ), + ( + "VeryTasty", + "verytasty", + "VERYTASTY", + "veryTasty", + "very_tasty", + "VERY_TASTY", + "very-tasty", + "VERY-TASTY", + ), + ("A", "a", "A", "a", "a", "A", "a", "A"), + ("Z42", "z42", "Z42", "z42", "z42", "Z42", "z42", "Z42"), + ] { + assert_eq!(None.apply_to_variant(original), original); + assert_eq!(LowerCase.apply_to_variant(original), lower); + assert_eq!(UpperCase.apply_to_variant(original), upper); + assert_eq!(PascalCase.apply_to_variant(original), original); + assert_eq!(CamelCase.apply_to_variant(original), camel); + assert_eq!(SnakeCase.apply_to_variant(original), snake); + assert_eq!(ScreamingSnakeCase.apply_to_variant(original), screaming); + assert_eq!(KebabCase.apply_to_variant(original), kebab); + assert_eq!( + ScreamingKebabCase.apply_to_variant(original), + screaming_kebab + ); + } +} + +#[test] +fn rename_fields() { + for &(original, upper, pascal, camel, screaming, kebab, screaming_kebab) in &[ + ( + "outcome", "OUTCOME", "Outcome", "outcome", "OUTCOME", "outcome", "OUTCOME", + ), + ( + "very_tasty", + "VERY_TASTY", + "VeryTasty", + "veryTasty", + "VERY_TASTY", + "very-tasty", + "VERY-TASTY", + ), + ("a", "A", "A", "a", "A", "a", "A"), + ("z42", "Z42", "Z42", "z42", "Z42", "z42", "Z42"), + ] { + assert_eq!(None.apply_to_field(original), original); + assert_eq!(UpperCase.apply_to_field(original), upper); + assert_eq!(PascalCase.apply_to_field(original), pascal); + assert_eq!(CamelCase.apply_to_field(original), camel); + assert_eq!(SnakeCase.apply_to_field(original), original); + assert_eq!(ScreamingSnakeCase.apply_to_field(original), screaming); + assert_eq!(KebabCase.apply_to_field(original), kebab); + assert_eq!(ScreamingKebabCase.apply_to_field(original), screaming_kebab); + } +} diff --git a/vendor/serde_derive/src/internals/check.rs b/vendor/serde_derive/src/internals/check.rs new file mode 100644 index 000000000..0e2484a79 --- /dev/null +++ b/vendor/serde_derive/src/internals/check.rs @@ -0,0 +1,420 @@ +use internals::ast::{Container, Data, Field, Style}; +use internals::attr::{Identifier, TagType}; +use internals::{ungroup, Ctxt, Derive}; +use syn::{Member, Type}; + +/// Cross-cutting checks that require looking at more than a single attrs +/// object. Simpler checks should happen when parsing and building the attrs. +pub fn check(cx: &Ctxt, cont: &mut Container, derive: Derive) { + check_getter(cx, cont); + check_flatten(cx, cont); + check_identifier(cx, cont); + check_variant_skip_attrs(cx, cont); + check_internal_tag_field_name_conflict(cx, cont); + check_adjacent_tag_conflict(cx, cont); + check_transparent(cx, cont, derive); + check_from_and_try_from(cx, cont); +} + +/// Getters are only allowed inside structs (not enums) with the `remote` +/// attribute. +fn check_getter(cx: &Ctxt, cont: &Container) { + match cont.data { + Data::Enum(_) => { + if cont.data.has_getter() { + cx.error_spanned_by( + cont.original, + "#[serde(getter = \"...\")] is not allowed in an enum", + ); + } + } + Data::Struct(_, _) => { + if cont.data.has_getter() && cont.attrs.remote().is_none() { + cx.error_spanned_by( + cont.original, + "#[serde(getter = \"...\")] can only be used in structs that have #[serde(remote = \"...\")]", + ); + } + } + } +} + +/// Flattening has some restrictions we can test. +fn check_flatten(cx: &Ctxt, cont: &Container) { + match &cont.data { + Data::Enum(variants) => { + for variant in variants { + for field in &variant.fields { + check_flatten_field(cx, variant.style, field); + } + } + } + Data::Struct(style, fields) => { + for field in fields { + check_flatten_field(cx, *style, field); + } + } + } +} + +fn check_flatten_field(cx: &Ctxt, style: Style, field: &Field) { + if !field.attrs.flatten() { + return; + } + match style { + Style::Tuple => { + cx.error_spanned_by( + field.original, + "#[serde(flatten)] cannot be used on tuple structs", + ); + } + Style::Newtype => { + cx.error_spanned_by( + field.original, + "#[serde(flatten)] cannot be used on newtype structs", + ); + } + _ => {} + } +} + +/// The `other` attribute must be used at most once and it must be the last +/// variant of an enum. +/// +/// Inside a `variant_identifier` all variants must be unit variants. Inside a +/// `field_identifier` all but possibly one variant must be unit variants. The +/// last variant may be a newtype variant which is an implicit "other" case. +fn check_identifier(cx: &Ctxt, cont: &Container) { + let variants = match &cont.data { + Data::Enum(variants) => variants, + Data::Struct(_, _) => { + return; + } + }; + + for (i, variant) in variants.iter().enumerate() { + match ( + variant.style, + cont.attrs.identifier(), + variant.attrs.other(), + cont.attrs.tag(), + ) { + // The `other` attribute may not be used in a variant_identifier. + (_, Identifier::Variant, true, _) => { + cx.error_spanned_by( + variant.original, + "#[serde(other)] may not be used on a variant identifier", + ); + } + + // Variant with `other` attribute cannot appear in untagged enum + (_, Identifier::No, true, &TagType::None) => { + cx.error_spanned_by( + variant.original, + "#[serde(other)] cannot appear on untagged enum", + ); + } + + // Variant with `other` attribute must be the last one. + (Style::Unit, Identifier::Field, true, _) | (Style::Unit, Identifier::No, true, _) => { + if i < variants.len() - 1 { + cx.error_spanned_by( + variant.original, + "#[serde(other)] must be on the last variant", + ); + } + } + + // Variant with `other` attribute must be a unit variant. + (_, Identifier::Field, true, _) | (_, Identifier::No, true, _) => { + cx.error_spanned_by( + variant.original, + "#[serde(other)] must be on a unit variant", + ); + } + + // Any sort of variant is allowed if this is not an identifier. + (_, Identifier::No, false, _) => {} + + // Unit variant without `other` attribute is always fine. + (Style::Unit, _, false, _) => {} + + // The last field is allowed to be a newtype catch-all. + (Style::Newtype, Identifier::Field, false, _) => { + if i < variants.len() - 1 { + cx.error_spanned_by( + variant.original, + format!("`{}` must be the last variant", variant.ident), + ); + } + } + + (_, Identifier::Field, false, _) => { + cx.error_spanned_by( + variant.original, + "#[serde(field_identifier)] may only contain unit variants", + ); + } + + (_, Identifier::Variant, false, _) => { + cx.error_spanned_by( + variant.original, + "#[serde(variant_identifier)] may only contain unit variants", + ); + } + } + } +} + +/// Skip-(de)serializing attributes are not allowed on variants marked +/// (de)serialize_with. +fn check_variant_skip_attrs(cx: &Ctxt, cont: &Container) { + let variants = match &cont.data { + Data::Enum(variants) => variants, + Data::Struct(_, _) => { + return; + } + }; + + for variant in variants.iter() { + if variant.attrs.serialize_with().is_some() { + if variant.attrs.skip_serializing() { + cx.error_spanned_by( + variant.original, + format!( + "variant `{}` cannot have both #[serde(serialize_with)] and #[serde(skip_serializing)]", + variant.ident + ), + ); + } + + for field in &variant.fields { + let member = member_message(&field.member); + + if field.attrs.skip_serializing() { + cx.error_spanned_by( + variant.original, + format!( + "variant `{}` cannot have both #[serde(serialize_with)] and a field {} marked with #[serde(skip_serializing)]", + variant.ident, member + ), + ); + } + + if field.attrs.skip_serializing_if().is_some() { + cx.error_spanned_by( + variant.original, + format!( + "variant `{}` cannot have both #[serde(serialize_with)] and a field {} marked with #[serde(skip_serializing_if)]", + variant.ident, member + ), + ); + } + } + } + + if variant.attrs.deserialize_with().is_some() { + if variant.attrs.skip_deserializing() { + cx.error_spanned_by( + variant.original, + format!( + "variant `{}` cannot have both #[serde(deserialize_with)] and #[serde(skip_deserializing)]", + variant.ident + ), + ); + } + + for field in &variant.fields { + if field.attrs.skip_deserializing() { + let member = member_message(&field.member); + + cx.error_spanned_by( + variant.original, + format!( + "variant `{}` cannot have both #[serde(deserialize_with)] and a field {} marked with #[serde(skip_deserializing)]", + variant.ident, member + ), + ); + } + } + } + } +} + +/// The tag of an internally-tagged struct variant must not be +/// the same as either one of its fields, as this would result in +/// duplicate keys in the serialized output and/or ambiguity in +/// the to-be-deserialized input. +fn check_internal_tag_field_name_conflict(cx: &Ctxt, cont: &Container) { + let variants = match &cont.data { + Data::Enum(variants) => variants, + Data::Struct(_, _) => return, + }; + + let tag = match cont.attrs.tag() { + TagType::Internal { tag } => tag.as_str(), + TagType::External | TagType::Adjacent { .. } | TagType::None => return, + }; + + let diagnose_conflict = || { + cx.error_spanned_by( + cont.original, + format!("variant field name `{}` conflicts with internal tag", tag), + ); + }; + + for variant in variants { + match variant.style { + Style::Struct => { + for field in &variant.fields { + let check_ser = !field.attrs.skip_serializing(); + let check_de = !field.attrs.skip_deserializing(); + let name = field.attrs.name(); + let ser_name = name.serialize_name(); + + if check_ser && ser_name == tag { + diagnose_conflict(); + return; + } + + for de_name in field.attrs.aliases() { + if check_de && de_name == tag { + diagnose_conflict(); + return; + } + } + } + } + Style::Unit | Style::Newtype | Style::Tuple => {} + } + } +} + +/// In the case of adjacently-tagged enums, the type and the +/// contents tag must differ, for the same reason. +fn check_adjacent_tag_conflict(cx: &Ctxt, cont: &Container) { + let (type_tag, content_tag) = match cont.attrs.tag() { + TagType::Adjacent { tag, content } => (tag, content), + TagType::Internal { .. } | TagType::External | TagType::None => return, + }; + + if type_tag == content_tag { + cx.error_spanned_by( + cont.original, + format!( + "enum tags `{}` for type and content conflict with each other", + type_tag + ), + ); + } +} + +/// Enums and unit structs cannot be transparent. +fn check_transparent(cx: &Ctxt, cont: &mut Container, derive: Derive) { + if !cont.attrs.transparent() { + return; + } + + if cont.attrs.type_from().is_some() { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] is not allowed with #[serde(from = \"...\")]", + ); + } + + if cont.attrs.type_try_from().is_some() { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] is not allowed with #[serde(try_from = \"...\")]", + ); + } + + if cont.attrs.type_into().is_some() { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] is not allowed with #[serde(into = \"...\")]", + ); + } + + let fields = match &mut cont.data { + Data::Enum(_) => { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] is not allowed on an enum", + ); + return; + } + Data::Struct(Style::Unit, _) => { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] is not allowed on a unit struct", + ); + return; + } + Data::Struct(_, fields) => fields, + }; + + let mut transparent_field = None; + + for field in fields { + if allow_transparent(field, derive) { + if transparent_field.is_some() { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] requires struct to have at most one transparent field", + ); + return; + } + transparent_field = Some(field); + } + } + + match transparent_field { + Some(transparent_field) => transparent_field.attrs.mark_transparent(), + None => match derive { + Derive::Serialize => { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] requires at least one field that is not skipped", + ); + } + Derive::Deserialize => { + cx.error_spanned_by( + cont.original, + "#[serde(transparent)] requires at least one field that is neither skipped nor has a default", + ); + } + }, + } +} + +fn member_message(member: &Member) -> String { + match member { + Member::Named(ident) => format!("`{}`", ident), + Member::Unnamed(i) => format!("#{}", i.index), + } +} + +fn allow_transparent(field: &Field, derive: Derive) -> bool { + if let Type::Path(ty) = ungroup(field.ty) { + if let Some(seg) = ty.path.segments.last() { + if seg.ident == "PhantomData" { + return false; + } + } + } + + match derive { + Derive::Serialize => !field.attrs.skip_serializing(), + Derive::Deserialize => !field.attrs.skip_deserializing() && field.attrs.default().is_none(), + } +} + +fn check_from_and_try_from(cx: &Ctxt, cont: &mut Container) { + if cont.attrs.type_from().is_some() && cont.attrs.type_try_from().is_some() { + cx.error_spanned_by( + cont.original, + "#[serde(from = \"...\")] and #[serde(try_from = \"...\")] conflict with each other", + ); + } +} diff --git a/vendor/serde_derive/src/internals/ctxt.rs b/vendor/serde_derive/src/internals/ctxt.rs new file mode 100644 index 000000000..d692c2a44 --- /dev/null +++ b/vendor/serde_derive/src/internals/ctxt.rs @@ -0,0 +1,62 @@ +use quote::ToTokens; +use std::cell::RefCell; +use std::fmt::Display; +use std::thread; +use syn; + +/// A type to collect errors together and format them. +/// +/// Dropping this object will cause a panic. It must be consumed using `check`. +/// +/// References can be shared since this type uses run-time exclusive mut checking. +#[derive(Default)] +pub struct Ctxt { + // The contents will be set to `None` during checking. This is so that checking can be + // enforced. + errors: RefCell<Option<Vec<syn::Error>>>, +} + +impl Ctxt { + /// Create a new context object. + /// + /// This object contains no errors, but will still trigger a panic if it is not `check`ed. + pub fn new() -> Self { + Ctxt { + errors: RefCell::new(Some(Vec::new())), + } + } + + /// Add an error to the context object with a tokenenizable object. + /// + /// The object is used for spanning in error messages. + pub fn error_spanned_by<A: ToTokens, T: Display>(&self, obj: A, msg: T) { + self.errors + .borrow_mut() + .as_mut() + .unwrap() + // Curb monomorphization from generating too many identical methods. + .push(syn::Error::new_spanned(obj.into_token_stream(), msg)); + } + + /// Add one of Syn's parse errors. + pub fn syn_error(&self, err: syn::Error) { + self.errors.borrow_mut().as_mut().unwrap().push(err); + } + + /// Consume this object, producing a formatted error string if there are errors. + pub fn check(self) -> Result<(), Vec<syn::Error>> { + let errors = self.errors.borrow_mut().take().unwrap(); + match errors.len() { + 0 => Ok(()), + _ => Err(errors), + } + } +} + +impl Drop for Ctxt { + fn drop(&mut self) { + if !thread::panicking() && self.errors.borrow().is_some() { + panic!("forgot to check for errors"); + } + } +} diff --git a/vendor/serde_derive/src/internals/mod.rs b/vendor/serde_derive/src/internals/mod.rs new file mode 100644 index 000000000..5e9f416c4 --- /dev/null +++ b/vendor/serde_derive/src/internals/mod.rs @@ -0,0 +1,28 @@ +pub mod ast; +pub mod attr; + +mod ctxt; +pub use self::ctxt::Ctxt; + +mod receiver; +pub use self::receiver::replace_receiver; + +mod case; +mod check; +mod respan; +mod symbol; + +use syn::Type; + +#[derive(Copy, Clone)] +pub enum Derive { + Serialize, + Deserialize, +} + +pub fn ungroup(mut ty: &Type) -> &Type { + while let Type::Group(group) = ty { + ty = &group.elem; + } + ty +} diff --git a/vendor/serde_derive/src/internals/receiver.rs b/vendor/serde_derive/src/internals/receiver.rs new file mode 100644 index 000000000..b08c67096 --- /dev/null +++ b/vendor/serde_derive/src/internals/receiver.rs @@ -0,0 +1,285 @@ +use internals::respan::respan; +use proc_macro2::Span; +use quote::ToTokens; +use std::mem; +use syn::punctuated::Punctuated; +use syn::{ + parse_quote, Data, DeriveInput, Expr, ExprPath, GenericArgument, GenericParam, Generics, Macro, + Path, PathArguments, QSelf, ReturnType, Type, TypeParamBound, TypePath, WherePredicate, +}; + +pub fn replace_receiver(input: &mut DeriveInput) { + let self_ty = { + let ident = &input.ident; + let ty_generics = input.generics.split_for_impl().1; + parse_quote!(#ident #ty_generics) + }; + let mut visitor = ReplaceReceiver(&self_ty); + visitor.visit_generics_mut(&mut input.generics); + visitor.visit_data_mut(&mut input.data); +} + +struct ReplaceReceiver<'a>(&'a TypePath); + +impl ReplaceReceiver<'_> { + fn self_ty(&self, span: Span) -> TypePath { + let tokens = self.0.to_token_stream(); + let respanned = respan(tokens, span); + syn::parse2(respanned).unwrap() + } + + fn self_to_qself(&self, qself: &mut Option<QSelf>, path: &mut Path) { + if path.leading_colon.is_some() || path.segments[0].ident != "Self" { + return; + } + + if path.segments.len() == 1 { + self.self_to_expr_path(path); + return; + } + + let span = path.segments[0].ident.span(); + *qself = Some(QSelf { + lt_token: Token![<](span), + ty: Box::new(Type::Path(self.self_ty(span))), + position: 0, + as_token: None, + gt_token: Token![>](span), + }); + + path.leading_colon = Some(**path.segments.pairs().next().unwrap().punct().unwrap()); + + let segments = mem::replace(&mut path.segments, Punctuated::new()); + path.segments = segments.into_pairs().skip(1).collect(); + } + + fn self_to_expr_path(&self, path: &mut Path) { + let self_ty = self.self_ty(path.segments[0].ident.span()); + let variant = mem::replace(path, self_ty.path); + for segment in &mut path.segments { + if let PathArguments::AngleBracketed(bracketed) = &mut segment.arguments { + if bracketed.colon2_token.is_none() && !bracketed.args.is_empty() { + bracketed.colon2_token = Some(<Token![::]>::default()); + } + } + } + if variant.segments.len() > 1 { + path.segments.push_punct(<Token![::]>::default()); + path.segments.extend(variant.segments.into_pairs().skip(1)); + } + } +} + +impl ReplaceReceiver<'_> { + // `Self` -> `Receiver` + fn visit_type_mut(&mut self, ty: &mut Type) { + let span = if let Type::Path(node) = ty { + if node.qself.is_none() && node.path.is_ident("Self") { + node.path.segments[0].ident.span() + } else { + self.visit_type_path_mut(node); + return; + } + } else { + self.visit_type_mut_impl(ty); + return; + }; + *ty = self.self_ty(span).into(); + } + + // `Self::Assoc` -> `<Receiver>::Assoc` + fn visit_type_path_mut(&mut self, ty: &mut TypePath) { + if ty.qself.is_none() { + self.self_to_qself(&mut ty.qself, &mut ty.path); + } + self.visit_type_path_mut_impl(ty); + } + + // `Self::method` -> `<Receiver>::method` + fn visit_expr_path_mut(&mut self, expr: &mut ExprPath) { + if expr.qself.is_none() { + self.self_to_qself(&mut expr.qself, &mut expr.path); + } + self.visit_expr_path_mut_impl(expr); + } + + // Everything below is simply traversing the syntax tree. + + fn visit_type_mut_impl(&mut self, ty: &mut Type) { + match ty { + Type::Array(ty) => { + self.visit_type_mut(&mut ty.elem); + self.visit_expr_mut(&mut ty.len); + } + Type::BareFn(ty) => { + for arg in &mut ty.inputs { + self.visit_type_mut(&mut arg.ty); + } + self.visit_return_type_mut(&mut ty.output); + } + Type::Group(ty) => self.visit_type_mut(&mut ty.elem), + Type::ImplTrait(ty) => { + for bound in &mut ty.bounds { + self.visit_type_param_bound_mut(bound); + } + } + Type::Macro(ty) => self.visit_macro_mut(&mut ty.mac), + Type::Paren(ty) => self.visit_type_mut(&mut ty.elem), + Type::Path(ty) => { + if let Some(qself) = &mut ty.qself { + self.visit_type_mut(&mut qself.ty); + } + self.visit_path_mut(&mut ty.path); + } + Type::Ptr(ty) => self.visit_type_mut(&mut ty.elem), + Type::Reference(ty) => self.visit_type_mut(&mut ty.elem), + Type::Slice(ty) => self.visit_type_mut(&mut ty.elem), + Type::TraitObject(ty) => { + for bound in &mut ty.bounds { + self.visit_type_param_bound_mut(bound); + } + } + Type::Tuple(ty) => { + for elem in &mut ty.elems { + self.visit_type_mut(elem); + } + } + + Type::Infer(_) | Type::Never(_) | Type::Verbatim(_) => {} + + #[cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + _ => {} + } + } + + fn visit_type_path_mut_impl(&mut self, ty: &mut TypePath) { + if let Some(qself) = &mut ty.qself { + self.visit_type_mut(&mut qself.ty); + } + self.visit_path_mut(&mut ty.path); + } + + fn visit_expr_path_mut_impl(&mut self, expr: &mut ExprPath) { + if let Some(qself) = &mut expr.qself { + self.visit_type_mut(&mut qself.ty); + } + self.visit_path_mut(&mut expr.path); + } + + fn visit_path_mut(&mut self, path: &mut Path) { + for segment in &mut path.segments { + self.visit_path_arguments_mut(&mut segment.arguments); + } + } + + fn visit_path_arguments_mut(&mut self, arguments: &mut PathArguments) { + match arguments { + PathArguments::None => {} + PathArguments::AngleBracketed(arguments) => { + for arg in &mut arguments.args { + match arg { + GenericArgument::Type(arg) => self.visit_type_mut(arg), + GenericArgument::Binding(arg) => self.visit_type_mut(&mut arg.ty), + GenericArgument::Lifetime(_) + | GenericArgument::Constraint(_) + | GenericArgument::Const(_) => {} + } + } + } + PathArguments::Parenthesized(arguments) => { + for argument in &mut arguments.inputs { + self.visit_type_mut(argument); + } + self.visit_return_type_mut(&mut arguments.output); + } + } + } + + fn visit_return_type_mut(&mut self, return_type: &mut ReturnType) { + match return_type { + ReturnType::Default => {} + ReturnType::Type(_, output) => self.visit_type_mut(output), + } + } + + fn visit_type_param_bound_mut(&mut self, bound: &mut TypeParamBound) { + match bound { + TypeParamBound::Trait(bound) => self.visit_path_mut(&mut bound.path), + TypeParamBound::Lifetime(_) => {} + } + } + + fn visit_generics_mut(&mut self, generics: &mut Generics) { + for param in &mut generics.params { + match param { + GenericParam::Type(param) => { + for bound in &mut param.bounds { + self.visit_type_param_bound_mut(bound); + } + } + GenericParam::Lifetime(_) | GenericParam::Const(_) => {} + } + } + if let Some(where_clause) = &mut generics.where_clause { + for predicate in &mut where_clause.predicates { + match predicate { + WherePredicate::Type(predicate) => { + self.visit_type_mut(&mut predicate.bounded_ty); + for bound in &mut predicate.bounds { + self.visit_type_param_bound_mut(bound); + } + } + WherePredicate::Lifetime(_) | WherePredicate::Eq(_) => {} + } + } + } + } + + fn visit_data_mut(&mut self, data: &mut Data) { + match data { + Data::Struct(data) => { + for field in &mut data.fields { + self.visit_type_mut(&mut field.ty); + } + } + Data::Enum(data) => { + for variant in &mut data.variants { + for field in &mut variant.fields { + self.visit_type_mut(&mut field.ty); + } + } + } + Data::Union(_) => {} + } + } + + fn visit_expr_mut(&mut self, expr: &mut Expr) { + match expr { + Expr::Binary(expr) => { + self.visit_expr_mut(&mut expr.left); + self.visit_expr_mut(&mut expr.right); + } + Expr::Call(expr) => { + self.visit_expr_mut(&mut expr.func); + for arg in &mut expr.args { + self.visit_expr_mut(arg); + } + } + Expr::Cast(expr) => { + self.visit_expr_mut(&mut expr.expr); + self.visit_type_mut(&mut expr.ty); + } + Expr::Field(expr) => self.visit_expr_mut(&mut expr.base), + Expr::Index(expr) => { + self.visit_expr_mut(&mut expr.expr); + self.visit_expr_mut(&mut expr.index); + } + Expr::Paren(expr) => self.visit_expr_mut(&mut expr.expr), + Expr::Path(expr) => self.visit_expr_path_mut(expr), + Expr::Unary(expr) => self.visit_expr_mut(&mut expr.expr), + _ => {} + } + } + + fn visit_macro_mut(&mut self, _mac: &mut Macro) {} +} diff --git a/vendor/serde_derive/src/internals/respan.rs b/vendor/serde_derive/src/internals/respan.rs new file mode 100644 index 000000000..dcec7017b --- /dev/null +++ b/vendor/serde_derive/src/internals/respan.rs @@ -0,0 +1,16 @@ +use proc_macro2::{Group, Span, TokenStream, TokenTree}; + +pub(crate) fn respan(stream: TokenStream, span: Span) -> TokenStream { + stream + .into_iter() + .map(|token| respan_token(token, span)) + .collect() +} + +fn respan_token(mut token: TokenTree, span: Span) -> TokenTree { + if let TokenTree::Group(g) = &mut token { + *g = Group::new(g.delimiter(), respan(g.stream(), span)); + } + token.set_span(span); + token +} diff --git a/vendor/serde_derive/src/internals/symbol.rs b/vendor/serde_derive/src/internals/symbol.rs new file mode 100644 index 000000000..1fedd2754 --- /dev/null +++ b/vendor/serde_derive/src/internals/symbol.rs @@ -0,0 +1,68 @@ +use std::fmt::{self, Display}; +use syn::{Ident, Path}; + +#[derive(Copy, Clone)] +pub struct Symbol(&'static str); + +pub const ALIAS: Symbol = Symbol("alias"); +pub const BORROW: Symbol = Symbol("borrow"); +pub const BOUND: Symbol = Symbol("bound"); +pub const CONTENT: Symbol = Symbol("content"); +pub const CRATE: Symbol = Symbol("crate"); +pub const DEFAULT: Symbol = Symbol("default"); +pub const DENY_UNKNOWN_FIELDS: Symbol = Symbol("deny_unknown_fields"); +pub const DESERIALIZE: Symbol = Symbol("deserialize"); +pub const DESERIALIZE_WITH: Symbol = Symbol("deserialize_with"); +pub const FIELD_IDENTIFIER: Symbol = Symbol("field_identifier"); +pub const FLATTEN: Symbol = Symbol("flatten"); +pub const FROM: Symbol = Symbol("from"); +pub const GETTER: Symbol = Symbol("getter"); +pub const INTO: Symbol = Symbol("into"); +pub const OTHER: Symbol = Symbol("other"); +pub const REMOTE: Symbol = Symbol("remote"); +pub const RENAME: Symbol = Symbol("rename"); +pub const RENAME_ALL: Symbol = Symbol("rename_all"); +pub const SERDE: Symbol = Symbol("serde"); +pub const SERIALIZE: Symbol = Symbol("serialize"); +pub const SERIALIZE_WITH: Symbol = Symbol("serialize_with"); +pub const SKIP: Symbol = Symbol("skip"); +pub const SKIP_DESERIALIZING: Symbol = Symbol("skip_deserializing"); +pub const SKIP_SERIALIZING: Symbol = Symbol("skip_serializing"); +pub const SKIP_SERIALIZING_IF: Symbol = Symbol("skip_serializing_if"); +pub const TAG: Symbol = Symbol("tag"); +pub const TRANSPARENT: Symbol = Symbol("transparent"); +pub const TRY_FROM: Symbol = Symbol("try_from"); +pub const UNTAGGED: Symbol = Symbol("untagged"); +pub const VARIANT_IDENTIFIER: Symbol = Symbol("variant_identifier"); +pub const WITH: Symbol = Symbol("with"); +pub const EXPECTING: Symbol = Symbol("expecting"); + +impl PartialEq<Symbol> for Ident { + fn eq(&self, word: &Symbol) -> bool { + self == word.0 + } +} + +impl<'a> PartialEq<Symbol> for &'a Ident { + fn eq(&self, word: &Symbol) -> bool { + *self == word.0 + } +} + +impl PartialEq<Symbol> for Path { + fn eq(&self, word: &Symbol) -> bool { + self.is_ident(word.0) + } +} + +impl<'a> PartialEq<Symbol> for &'a Path { + fn eq(&self, word: &Symbol) -> bool { + self.is_ident(word.0) + } +} + +impl Display for Symbol { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str(self.0) + } +} diff --git a/vendor/serde_derive/src/lib.rs b/vendor/serde_derive/src/lib.rs new file mode 100644 index 000000000..d82e92560 --- /dev/null +++ b/vendor/serde_derive/src/lib.rs @@ -0,0 +1,109 @@ +//! This crate provides Serde's two derive macros. +//! +//! ```edition2018 +//! # use serde_derive::{Serialize, Deserialize}; +//! # +//! #[derive(Serialize, Deserialize)] +//! # struct S; +//! # +//! # fn main() {} +//! ``` +//! +//! Please refer to [https://serde.rs/derive.html] for how to set this up. +//! +//! [https://serde.rs/derive.html]: https://serde.rs/derive.html + +#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.140")] +#![allow(unknown_lints, bare_trait_objects)] +// Ignored clippy lints +#![allow( + // clippy false positive: https://github.com/rust-lang/rust-clippy/issues/7054 + clippy::branches_sharing_code, + clippy::cognitive_complexity, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/7575 + clippy::collapsible_match, + clippy::derive_partial_eq_without_eq, + clippy::enum_variant_names, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/6797 + clippy::manual_map, + clippy::match_like_matches_macro, + clippy::needless_pass_by_value, + clippy::too_many_arguments, + clippy::trivially_copy_pass_by_ref, + clippy::used_underscore_binding, + clippy::wildcard_in_or_patterns, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704 + clippy::unnested_or_patterns, +)] +// Ignored clippy_pedantic lints +#![allow( + clippy::cast_possible_truncation, + clippy::checked_conversions, + clippy::doc_markdown, + clippy::enum_glob_use, + clippy::indexing_slicing, + clippy::items_after_statements, + clippy::let_underscore_drop, + clippy::manual_assert, + clippy::map_err_ignore, + clippy::match_same_arms, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/6984 + clippy::match_wildcard_for_single_variants, + clippy::module_name_repetitions, + clippy::must_use_candidate, + clippy::option_if_let_else, + clippy::similar_names, + clippy::single_match_else, + clippy::struct_excessive_bools, + clippy::too_many_lines, + clippy::unseparated_literal_suffix, + clippy::unused_self, + clippy::use_self, + clippy::wildcard_imports +)] +#![cfg_attr(all(test, exhaustive), feature(non_exhaustive_omitted_patterns_lint))] + +#[macro_use] +extern crate quote; +#[macro_use] +extern crate syn; + +extern crate proc_macro; +extern crate proc_macro2; + +mod internals; + +use proc_macro::TokenStream; +use syn::DeriveInput; + +#[macro_use] +mod bound; +#[macro_use] +mod fragment; + +mod de; +mod dummy; +mod pretend; +mod ser; +mod try; + +#[proc_macro_derive(Serialize, attributes(serde))] +pub fn derive_serialize(input: TokenStream) -> TokenStream { + let mut input = parse_macro_input!(input as DeriveInput); + ser::expand_derive_serialize(&mut input) + .unwrap_or_else(to_compile_errors) + .into() +} + +#[proc_macro_derive(Deserialize, attributes(serde))] +pub fn derive_deserialize(input: TokenStream) -> TokenStream { + let mut input = parse_macro_input!(input as DeriveInput); + de::expand_derive_deserialize(&mut input) + .unwrap_or_else(to_compile_errors) + .into() +} + +fn to_compile_errors(errors: Vec<syn::Error>) -> proc_macro2::TokenStream { + let compile_errors = errors.iter().map(syn::Error::to_compile_error); + quote!(#(#compile_errors)*) +} diff --git a/vendor/serde_derive/src/pretend.rs b/vendor/serde_derive/src/pretend.rs new file mode 100644 index 000000000..d7b953d63 --- /dev/null +++ b/vendor/serde_derive/src/pretend.rs @@ -0,0 +1,201 @@ +use proc_macro2::TokenStream; +use quote::format_ident; + +use internals::ast::{Container, Data, Field, Style, Variant}; + +// Suppress dead_code warnings that would otherwise appear when using a remote +// derive. Other than this pretend code, a struct annotated with remote derive +// never has its fields referenced and an enum annotated with remote derive +// never has its variants constructed. +// +// warning: field is never used: `i` +// --> src/main.rs:4:20 +// | +// 4 | struct StructDef { i: i32 } +// | ^^^^^^ +// +// warning: variant is never constructed: `V` +// --> src/main.rs:8:16 +// | +// 8 | enum EnumDef { V } +// | ^ +// +pub fn pretend_used(cont: &Container, is_packed: bool) -> TokenStream { + let pretend_fields = pretend_fields_used(cont, is_packed); + let pretend_variants = pretend_variants_used(cont); + + quote! { + #pretend_fields + #pretend_variants + } +} + +// For structs with named fields, expands to: +// +// match None::<&T> { +// Some(T { a: __v0, b: __v1 }) => {} +// _ => {} +// } +// +// For packed structs on sufficiently new rustc, expands to: +// +// match None::<&T> { +// Some(__v @ T { a: _, b: _ }) => { +// let _ = addr_of!(__v.a); +// let _ = addr_of!(__v.b); +// } +// _ => {} +// } +// +// For packed structs on older rustc, we assume Sized and !Drop, and expand to: +// +// match None::<T> { +// Some(T { a: __v0, b: __v1 }) => {} +// _ => {} +// } +// +// For enums, expands to the following but only including struct variants: +// +// match None::<&T> { +// Some(T::A { a: __v0 }) => {} +// Some(T::B { b: __v0 }) => {} +// _ => {} +// } +// +fn pretend_fields_used(cont: &Container, is_packed: bool) -> TokenStream { + match &cont.data { + Data::Enum(variants) => pretend_fields_used_enum(cont, variants), + Data::Struct(Style::Struct, fields) => { + if is_packed { + pretend_fields_used_struct_packed(cont, fields) + } else { + pretend_fields_used_struct(cont, fields) + } + } + Data::Struct(_, _) => quote!(), + } +} + +fn pretend_fields_used_struct(cont: &Container, fields: &[Field]) -> TokenStream { + let type_ident = &cont.ident; + let (_, ty_generics, _) = cont.generics.split_for_impl(); + + let members = fields.iter().map(|field| &field.member); + let placeholders = (0usize..).map(|i| format_ident!("__v{}", i)); + + quote! { + match _serde::__private::None::<&#type_ident #ty_generics> { + _serde::__private::Some(#type_ident { #(#members: #placeholders),* }) => {} + _ => {} + } + } +} + +fn pretend_fields_used_struct_packed(cont: &Container, fields: &[Field]) -> TokenStream { + let type_ident = &cont.ident; + let (_, ty_generics, _) = cont.generics.split_for_impl(); + + let members = fields.iter().map(|field| &field.member).collect::<Vec<_>>(); + + #[cfg(not(no_ptr_addr_of))] + { + quote! { + match _serde::__private::None::<&#type_ident #ty_generics> { + _serde::__private::Some(__v @ #type_ident { #(#members: _),* }) => { + #( + let _ = _serde::__private::ptr::addr_of!(__v.#members); + )* + } + _ => {} + } + } + } + + #[cfg(no_ptr_addr_of)] + { + let placeholders = (0usize..).map(|i| format_ident!("__v{}", i)); + + quote! { + match _serde::__private::None::<#type_ident #ty_generics> { + _serde::__private::Some(#type_ident { #(#members: #placeholders),* }) => {} + _ => {} + } + } + } +} + +fn pretend_fields_used_enum(cont: &Container, variants: &[Variant]) -> TokenStream { + let type_ident = &cont.ident; + let (_, ty_generics, _) = cont.generics.split_for_impl(); + + let patterns = variants + .iter() + .filter_map(|variant| match variant.style { + Style::Struct => { + let variant_ident = &variant.ident; + let members = variant.fields.iter().map(|field| &field.member); + let placeholders = (0usize..).map(|i| format_ident!("__v{}", i)); + Some(quote!(#type_ident::#variant_ident { #(#members: #placeholders),* })) + } + _ => None, + }) + .collect::<Vec<_>>(); + + quote! { + match _serde::__private::None::<&#type_ident #ty_generics> { + #( + _serde::__private::Some(#patterns) => {} + )* + _ => {} + } + } +} + +// Expands to one of these per enum variant: +// +// match None { +// Some((__v0, __v1,)) => { +// let _ = E::V { a: __v0, b: __v1 }; +// } +// _ => {} +// } +// +fn pretend_variants_used(cont: &Container) -> TokenStream { + let variants = match &cont.data { + Data::Enum(variants) => variants, + Data::Struct(_, _) => { + return quote!(); + } + }; + + let type_ident = &cont.ident; + let (_, ty_generics, _) = cont.generics.split_for_impl(); + let turbofish = ty_generics.as_turbofish(); + + let cases = variants.iter().map(|variant| { + let variant_ident = &variant.ident; + let placeholders = &(0..variant.fields.len()) + .map(|i| format_ident!("__v{}", i)) + .collect::<Vec<_>>(); + + let pat = match variant.style { + Style::Struct => { + let members = variant.fields.iter().map(|field| &field.member); + quote!({ #(#members: #placeholders),* }) + } + Style::Tuple | Style::Newtype => quote!(( #(#placeholders),* )), + Style::Unit => quote!(), + }; + + quote! { + match _serde::__private::None { + _serde::__private::Some((#(#placeholders,)*)) => { + let _ = #type_ident::#variant_ident #turbofish #pat; + } + _ => {} + } + } + }); + + quote!(#(#cases)*) +} diff --git a/vendor/serde_derive/src/ser.rs b/vendor/serde_derive/src/ser.rs new file mode 100644 index 000000000..529a20d79 --- /dev/null +++ b/vendor/serde_derive/src/ser.rs @@ -0,0 +1,1338 @@ +use proc_macro2::{Span, TokenStream}; +use syn::spanned::Spanned; +use syn::{self, Ident, Index, Member}; + +use bound; +use dummy; +use fragment::{Fragment, Match, Stmts}; +use internals::ast::{Container, Data, Field, Style, Variant}; +use internals::{attr, replace_receiver, Ctxt, Derive}; +use pretend; + +pub fn expand_derive_serialize( + input: &mut syn::DeriveInput, +) -> Result<TokenStream, Vec<syn::Error>> { + replace_receiver(input); + + let ctxt = Ctxt::new(); + let cont = match Container::from_ast(&ctxt, input, Derive::Serialize) { + Some(cont) => cont, + None => return Err(ctxt.check().unwrap_err()), + }; + precondition(&ctxt, &cont); + ctxt.check()?; + + let ident = &cont.ident; + let params = Parameters::new(&cont); + let (impl_generics, ty_generics, where_clause) = params.generics.split_for_impl(); + let body = Stmts(serialize_body(&cont, ¶ms)); + let serde = cont.attrs.serde_path(); + + let impl_block = if let Some(remote) = cont.attrs.remote() { + let vis = &input.vis; + let used = pretend::pretend_used(&cont, params.is_packed); + quote! { + impl #impl_generics #ident #ty_generics #where_clause { + #vis fn serialize<__S>(__self: &#remote #ty_generics, __serializer: __S) -> #serde::__private::Result<__S::Ok, __S::Error> + where + __S: #serde::Serializer, + { + #used + #body + } + } + } + } else { + quote! { + #[automatically_derived] + impl #impl_generics #serde::Serialize for #ident #ty_generics #where_clause { + fn serialize<__S>(&self, __serializer: __S) -> #serde::__private::Result<__S::Ok, __S::Error> + where + __S: #serde::Serializer, + { + #body + } + } + } + }; + + Ok(dummy::wrap_in_const( + cont.attrs.custom_serde_path(), + "SERIALIZE", + ident, + impl_block, + )) +} + +fn precondition(cx: &Ctxt, cont: &Container) { + match cont.attrs.identifier() { + attr::Identifier::No => {} + attr::Identifier::Field => { + cx.error_spanned_by(cont.original, "field identifiers cannot be serialized"); + } + attr::Identifier::Variant => { + cx.error_spanned_by(cont.original, "variant identifiers cannot be serialized"); + } + } +} + +struct Parameters { + /// Variable holding the value being serialized. Either `self` for local + /// types or `__self` for remote types. + self_var: Ident, + + /// Path to the type the impl is for. Either a single `Ident` for local + /// types or `some::remote::Ident` for remote types. Does not include + /// generic parameters. + this: syn::Path, + + /// Generics including any explicit and inferred bounds for the impl. + generics: syn::Generics, + + /// Type has a `serde(remote = "...")` attribute. + is_remote: bool, + + /// Type has a repr(packed) attribute. + is_packed: bool, +} + +impl Parameters { + fn new(cont: &Container) -> Self { + let is_remote = cont.attrs.remote().is_some(); + let self_var = if is_remote { + Ident::new("__self", Span::call_site()) + } else { + Ident::new("self", Span::call_site()) + }; + + let this = match cont.attrs.remote() { + Some(remote) => remote.clone(), + None => cont.ident.clone().into(), + }; + + let is_packed = cont.attrs.is_packed(); + + let generics = build_generics(cont); + + Parameters { + self_var, + this, + generics, + is_remote, + is_packed, + } + } + + /// Type name to use in error messages and `&'static str` arguments to + /// various Serializer methods. + fn type_name(&self) -> String { + self.this.segments.last().unwrap().ident.to_string() + } +} + +// All the generics in the input, plus a bound `T: Serialize` for each generic +// field type that will be serialized by us. +fn build_generics(cont: &Container) -> syn::Generics { + let generics = bound::without_defaults(cont.generics); + + let generics = + bound::with_where_predicates_from_fields(cont, &generics, attr::Field::ser_bound); + + let generics = + bound::with_where_predicates_from_variants(cont, &generics, attr::Variant::ser_bound); + + match cont.attrs.ser_bound() { + Some(predicates) => bound::with_where_predicates(&generics, predicates), + None => bound::with_bound( + cont, + &generics, + needs_serialize_bound, + &parse_quote!(_serde::Serialize), + ), + } +} + +// Fields with a `skip_serializing` or `serialize_with` attribute, or which +// belong to a variant with a 'skip_serializing` or `serialize_with` attribute, +// are not serialized by us so we do not generate a bound. Fields with a `bound` +// attribute specify their own bound so we do not generate one. All other fields +// may need a `T: Serialize` bound where T is the type of the field. +fn needs_serialize_bound(field: &attr::Field, variant: Option<&attr::Variant>) -> bool { + !field.skip_serializing() + && field.serialize_with().is_none() + && field.ser_bound().is_none() + && variant.map_or(true, |variant| { + !variant.skip_serializing() + && variant.serialize_with().is_none() + && variant.ser_bound().is_none() + }) +} + +fn serialize_body(cont: &Container, params: &Parameters) -> Fragment { + if cont.attrs.transparent() { + serialize_transparent(cont, params) + } else if let Some(type_into) = cont.attrs.type_into() { + serialize_into(params, type_into) + } else { + match &cont.data { + Data::Enum(variants) => serialize_enum(params, variants, &cont.attrs), + Data::Struct(Style::Struct, fields) => serialize_struct(params, fields, &cont.attrs), + Data::Struct(Style::Tuple, fields) => { + serialize_tuple_struct(params, fields, &cont.attrs) + } + Data::Struct(Style::Newtype, fields) => { + serialize_newtype_struct(params, &fields[0], &cont.attrs) + } + Data::Struct(Style::Unit, _) => serialize_unit_struct(&cont.attrs), + } + } +} + +fn serialize_transparent(cont: &Container, params: &Parameters) -> Fragment { + let fields = match &cont.data { + Data::Struct(_, fields) => fields, + Data::Enum(_) => unreachable!(), + }; + + let self_var = ¶ms.self_var; + let transparent_field = fields.iter().find(|f| f.attrs.transparent()).unwrap(); + let member = &transparent_field.member; + + let path = match transparent_field.attrs.serialize_with() { + Some(path) => quote!(#path), + None => { + let span = transparent_field.original.span(); + quote_spanned!(span=> _serde::Serialize::serialize) + } + }; + + quote_block! { + #path(&#self_var.#member, __serializer) + } +} + +fn serialize_into(params: &Parameters, type_into: &syn::Type) -> Fragment { + let self_var = ¶ms.self_var; + quote_block! { + _serde::Serialize::serialize( + &_serde::__private::Into::<#type_into>::into(_serde::__private::Clone::clone(#self_var)), + __serializer) + } +} + +fn serialize_unit_struct(cattrs: &attr::Container) -> Fragment { + let type_name = cattrs.name().serialize_name(); + + quote_expr! { + _serde::Serializer::serialize_unit_struct(__serializer, #type_name) + } +} + +fn serialize_newtype_struct( + params: &Parameters, + field: &Field, + cattrs: &attr::Container, +) -> Fragment { + let type_name = cattrs.name().serialize_name(); + + let mut field_expr = get_member( + params, + field, + &Member::Unnamed(Index { + index: 0, + span: Span::call_site(), + }), + ); + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::Serializer::serialize_newtype_struct); + quote_expr! { + #func(__serializer, #type_name, #field_expr) + } +} + +fn serialize_tuple_struct( + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> Fragment { + let serialize_stmts = + serialize_tuple_struct_visitor(fields, params, false, &TupleTrait::SerializeTupleStruct); + + let type_name = cattrs.name().serialize_name(); + + let mut serialized_fields = fields + .iter() + .enumerate() + .filter(|(_, field)| !field.attrs.skip_serializing()) + .peekable(); + + let let_mut = mut_if(serialized_fields.peek().is_some()); + + let len = serialized_fields + .map(|(i, field)| match field.attrs.skip_serializing_if() { + None => quote!(1), + Some(path) => { + let index = syn::Index { + index: i as u32, + span: Span::call_site(), + }; + let field_expr = get_member(params, field, &Member::Unnamed(index)); + quote!(if #path(#field_expr) { 0 } else { 1 }) + } + }) + .fold(quote!(0), |sum, expr| quote!(#sum + #expr)); + + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_tuple_struct(__serializer, #type_name, #len)); + #(#serialize_stmts)* + _serde::ser::SerializeTupleStruct::end(__serde_state) + } +} + +fn serialize_struct(params: &Parameters, fields: &[Field], cattrs: &attr::Container) -> Fragment { + assert!(fields.len() as u64 <= u64::from(u32::max_value())); + + if cattrs.has_flatten() { + serialize_struct_as_map(params, fields, cattrs) + } else { + serialize_struct_as_struct(params, fields, cattrs) + } +} + +fn serialize_struct_tag_field(cattrs: &attr::Container, struct_trait: &StructTrait) -> TokenStream { + match cattrs.tag() { + attr::TagType::Internal { tag } => { + let type_name = cattrs.name().serialize_name(); + let func = struct_trait.serialize_field(Span::call_site()); + quote! { + try!(#func(&mut __serde_state, #tag, #type_name)); + } + } + _ => quote! {}, + } +} + +fn serialize_struct_as_struct( + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> Fragment { + let serialize_fields = + serialize_struct_visitor(fields, params, false, &StructTrait::SerializeStruct); + + let type_name = cattrs.name().serialize_name(); + + let tag_field = serialize_struct_tag_field(cattrs, &StructTrait::SerializeStruct); + let tag_field_exists = !tag_field.is_empty(); + + let mut serialized_fields = fields + .iter() + .filter(|&field| !field.attrs.skip_serializing()) + .peekable(); + + let let_mut = mut_if(serialized_fields.peek().is_some() || tag_field_exists); + + let len = serialized_fields + .map(|field| match field.attrs.skip_serializing_if() { + None => quote!(1), + Some(path) => { + let field_expr = get_member(params, field, &field.member); + quote!(if #path(#field_expr) { 0 } else { 1 }) + } + }) + .fold( + quote!(#tag_field_exists as usize), + |sum, expr| quote!(#sum + #expr), + ); + + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_struct(__serializer, #type_name, #len)); + #tag_field + #(#serialize_fields)* + _serde::ser::SerializeStruct::end(__serde_state) + } +} + +fn serialize_struct_as_map( + params: &Parameters, + fields: &[Field], + cattrs: &attr::Container, +) -> Fragment { + let serialize_fields = + serialize_struct_visitor(fields, params, false, &StructTrait::SerializeMap); + + let tag_field = serialize_struct_tag_field(cattrs, &StructTrait::SerializeMap); + let tag_field_exists = !tag_field.is_empty(); + + let mut serialized_fields = fields + .iter() + .filter(|&field| !field.attrs.skip_serializing()) + .peekable(); + + let let_mut = mut_if(serialized_fields.peek().is_some() || tag_field_exists); + + let len = if cattrs.has_flatten() { + quote!(_serde::__private::None) + } else { + let len = serialized_fields + .map(|field| match field.attrs.skip_serializing_if() { + None => quote!(1), + Some(path) => { + let field_expr = get_member(params, field, &field.member); + quote!(if #path(#field_expr) { 0 } else { 1 }) + } + }) + .fold( + quote!(#tag_field_exists as usize), + |sum, expr| quote!(#sum + #expr), + ); + quote!(_serde::__private::Some(#len)) + }; + + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_map(__serializer, #len)); + #tag_field + #(#serialize_fields)* + _serde::ser::SerializeMap::end(__serde_state) + } +} + +fn serialize_enum(params: &Parameters, variants: &[Variant], cattrs: &attr::Container) -> Fragment { + assert!(variants.len() as u64 <= u64::from(u32::max_value())); + + let self_var = ¶ms.self_var; + + let arms: Vec<_> = variants + .iter() + .enumerate() + .map(|(variant_index, variant)| { + serialize_variant(params, variant, variant_index as u32, cattrs) + }) + .collect(); + + quote_expr! { + match *#self_var { + #(#arms)* + } + } +} + +fn serialize_variant( + params: &Parameters, + variant: &Variant, + variant_index: u32, + cattrs: &attr::Container, +) -> TokenStream { + let this = ¶ms.this; + let variant_ident = &variant.ident; + + if variant.attrs.skip_serializing() { + let skipped_msg = format!( + "the enum variant {}::{} cannot be serialized", + params.type_name(), + variant_ident + ); + let skipped_err = quote! { + _serde::__private::Err(_serde::ser::Error::custom(#skipped_msg)) + }; + let fields_pat = match variant.style { + Style::Unit => quote!(), + Style::Newtype | Style::Tuple => quote!((..)), + Style::Struct => quote!({ .. }), + }; + quote! { + #this::#variant_ident #fields_pat => #skipped_err, + } + } else { + // variant wasn't skipped + let case = match variant.style { + Style::Unit => { + quote! { + #this::#variant_ident + } + } + Style::Newtype => { + quote! { + #this::#variant_ident(ref __field0) + } + } + Style::Tuple => { + let field_names = (0..variant.fields.len()) + .map(|i| Ident::new(&format!("__field{}", i), Span::call_site())); + quote! { + #this::#variant_ident(#(ref #field_names),*) + } + } + Style::Struct => { + let members = variant.fields.iter().map(|f| &f.member); + quote! { + #this::#variant_ident { #(ref #members),* } + } + } + }; + + let body = Match(match cattrs.tag() { + attr::TagType::External => { + serialize_externally_tagged_variant(params, variant, variant_index, cattrs) + } + attr::TagType::Internal { tag } => { + serialize_internally_tagged_variant(params, variant, cattrs, tag) + } + attr::TagType::Adjacent { tag, content } => { + serialize_adjacently_tagged_variant(params, variant, cattrs, tag, content) + } + attr::TagType::None => serialize_untagged_variant(params, variant, cattrs), + }); + + quote! { + #case => #body + } + } +} + +fn serialize_externally_tagged_variant( + params: &Parameters, + variant: &Variant, + variant_index: u32, + cattrs: &attr::Container, +) -> Fragment { + let type_name = cattrs.name().serialize_name(); + let variant_name = variant.attrs.name().serialize_name(); + + if let Some(path) = variant.attrs.serialize_with() { + let ser = wrap_serialize_variant_with(params, path, variant); + return quote_expr! { + _serde::Serializer::serialize_newtype_variant( + __serializer, + #type_name, + #variant_index, + #variant_name, + #ser, + ) + }; + } + + match effective_style(variant) { + Style::Unit => { + quote_expr! { + _serde::Serializer::serialize_unit_variant( + __serializer, + #type_name, + #variant_index, + #variant_name, + ) + } + } + Style::Newtype => { + let field = &variant.fields[0]; + let mut field_expr = quote!(__field0); + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::Serializer::serialize_newtype_variant); + quote_expr! { + #func( + __serializer, + #type_name, + #variant_index, + #variant_name, + #field_expr, + ) + } + } + Style::Tuple => serialize_tuple_variant( + TupleVariant::ExternallyTagged { + type_name, + variant_index, + variant_name, + }, + params, + &variant.fields, + ), + Style::Struct => serialize_struct_variant( + StructVariant::ExternallyTagged { + variant_index, + variant_name, + }, + params, + &variant.fields, + &type_name, + ), + } +} + +fn serialize_internally_tagged_variant( + params: &Parameters, + variant: &Variant, + cattrs: &attr::Container, + tag: &str, +) -> Fragment { + let type_name = cattrs.name().serialize_name(); + let variant_name = variant.attrs.name().serialize_name(); + + let enum_ident_str = params.type_name(); + let variant_ident_str = variant.ident.to_string(); + + if let Some(path) = variant.attrs.serialize_with() { + let ser = wrap_serialize_variant_with(params, path, variant); + return quote_expr! { + _serde::__private::ser::serialize_tagged_newtype( + __serializer, + #enum_ident_str, + #variant_ident_str, + #tag, + #variant_name, + #ser, + ) + }; + } + + match effective_style(variant) { + Style::Unit => { + quote_block! { + let mut __struct = try!(_serde::Serializer::serialize_struct( + __serializer, #type_name, 1)); + try!(_serde::ser::SerializeStruct::serialize_field( + &mut __struct, #tag, #variant_name)); + _serde::ser::SerializeStruct::end(__struct) + } + } + Style::Newtype => { + let field = &variant.fields[0]; + let mut field_expr = quote!(__field0); + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::__private::ser::serialize_tagged_newtype); + quote_expr! { + #func( + __serializer, + #enum_ident_str, + #variant_ident_str, + #tag, + #variant_name, + #field_expr, + ) + } + } + Style::Struct => serialize_struct_variant( + StructVariant::InternallyTagged { tag, variant_name }, + params, + &variant.fields, + &type_name, + ), + Style::Tuple => unreachable!("checked in serde_derive_internals"), + } +} + +fn serialize_adjacently_tagged_variant( + params: &Parameters, + variant: &Variant, + cattrs: &attr::Container, + tag: &str, + content: &str, +) -> Fragment { + let this = ¶ms.this; + let type_name = cattrs.name().serialize_name(); + let variant_name = variant.attrs.name().serialize_name(); + + let inner = Stmts(if let Some(path) = variant.attrs.serialize_with() { + let ser = wrap_serialize_variant_with(params, path, variant); + quote_expr! { + _serde::Serialize::serialize(#ser, __serializer) + } + } else { + match effective_style(variant) { + Style::Unit => { + return quote_block! { + let mut __struct = try!(_serde::Serializer::serialize_struct( + __serializer, #type_name, 1)); + try!(_serde::ser::SerializeStruct::serialize_field( + &mut __struct, #tag, #variant_name)); + _serde::ser::SerializeStruct::end(__struct) + }; + } + Style::Newtype => { + let field = &variant.fields[0]; + let mut field_expr = quote!(__field0); + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::ser::SerializeStruct::serialize_field); + return quote_block! { + let mut __struct = try!(_serde::Serializer::serialize_struct( + __serializer, #type_name, 2)); + try!(_serde::ser::SerializeStruct::serialize_field( + &mut __struct, #tag, #variant_name)); + try!(#func( + &mut __struct, #content, #field_expr)); + _serde::ser::SerializeStruct::end(__struct) + }; + } + Style::Tuple => { + serialize_tuple_variant(TupleVariant::Untagged, params, &variant.fields) + } + Style::Struct => serialize_struct_variant( + StructVariant::Untagged, + params, + &variant.fields, + &variant_name, + ), + } + }); + + let fields_ty = variant.fields.iter().map(|f| &f.ty); + let fields_ident: &Vec<_> = &match variant.style { + Style::Unit => { + if variant.attrs.serialize_with().is_some() { + vec![] + } else { + unreachable!() + } + } + Style::Newtype => vec![Member::Named(Ident::new("__field0", Span::call_site()))], + Style::Tuple => (0..variant.fields.len()) + .map(|i| Member::Named(Ident::new(&format!("__field{}", i), Span::call_site()))) + .collect(), + Style::Struct => variant.fields.iter().map(|f| f.member.clone()).collect(), + }; + + let (_, ty_generics, where_clause) = params.generics.split_for_impl(); + + let wrapper_generics = if fields_ident.is_empty() { + params.generics.clone() + } else { + bound::with_lifetime_bound(¶ms.generics, "'__a") + }; + let (wrapper_impl_generics, wrapper_ty_generics, _) = wrapper_generics.split_for_impl(); + + quote_block! { + struct __AdjacentlyTagged #wrapper_generics #where_clause { + data: (#(&'__a #fields_ty,)*), + phantom: _serde::__private::PhantomData<#this #ty_generics>, + } + + impl #wrapper_impl_generics _serde::Serialize for __AdjacentlyTagged #wrapper_ty_generics #where_clause { + fn serialize<__S>(&self, __serializer: __S) -> _serde::__private::Result<__S::Ok, __S::Error> + where + __S: _serde::Serializer, + { + // Elements that have skip_serializing will be unused. + #[allow(unused_variables)] + let (#(#fields_ident,)*) = self.data; + #inner + } + } + + let mut __struct = try!(_serde::Serializer::serialize_struct( + __serializer, #type_name, 2)); + try!(_serde::ser::SerializeStruct::serialize_field( + &mut __struct, #tag, #variant_name)); + try!(_serde::ser::SerializeStruct::serialize_field( + &mut __struct, #content, &__AdjacentlyTagged { + data: (#(#fields_ident,)*), + phantom: _serde::__private::PhantomData::<#this #ty_generics>, + })); + _serde::ser::SerializeStruct::end(__struct) + } +} + +fn serialize_untagged_variant( + params: &Parameters, + variant: &Variant, + cattrs: &attr::Container, +) -> Fragment { + if let Some(path) = variant.attrs.serialize_with() { + let ser = wrap_serialize_variant_with(params, path, variant); + return quote_expr! { + _serde::Serialize::serialize(#ser, __serializer) + }; + } + + match effective_style(variant) { + Style::Unit => { + quote_expr! { + _serde::Serializer::serialize_unit(__serializer) + } + } + Style::Newtype => { + let field = &variant.fields[0]; + let mut field_expr = quote!(__field0); + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let func = quote_spanned!(span=> _serde::Serialize::serialize); + quote_expr! { + #func(#field_expr, __serializer) + } + } + Style::Tuple => serialize_tuple_variant(TupleVariant::Untagged, params, &variant.fields), + Style::Struct => { + let type_name = cattrs.name().serialize_name(); + serialize_struct_variant(StructVariant::Untagged, params, &variant.fields, &type_name) + } + } +} + +enum TupleVariant { + ExternallyTagged { + type_name: String, + variant_index: u32, + variant_name: String, + }, + Untagged, +} + +fn serialize_tuple_variant( + context: TupleVariant, + params: &Parameters, + fields: &[Field], +) -> Fragment { + let tuple_trait = match context { + TupleVariant::ExternallyTagged { .. } => TupleTrait::SerializeTupleVariant, + TupleVariant::Untagged => TupleTrait::SerializeTuple, + }; + + let serialize_stmts = serialize_tuple_struct_visitor(fields, params, true, &tuple_trait); + + let mut serialized_fields = fields + .iter() + .enumerate() + .filter(|(_, field)| !field.attrs.skip_serializing()) + .peekable(); + + let let_mut = mut_if(serialized_fields.peek().is_some()); + + let len = serialized_fields + .map(|(i, field)| match field.attrs.skip_serializing_if() { + None => quote!(1), + Some(path) => { + let field_expr = Ident::new(&format!("__field{}", i), Span::call_site()); + quote!(if #path(#field_expr) { 0 } else { 1 }) + } + }) + .fold(quote!(0), |sum, expr| quote!(#sum + #expr)); + + match context { + TupleVariant::ExternallyTagged { + type_name, + variant_index, + variant_name, + } => { + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_tuple_variant( + __serializer, + #type_name, + #variant_index, + #variant_name, + #len)); + #(#serialize_stmts)* + _serde::ser::SerializeTupleVariant::end(__serde_state) + } + } + TupleVariant::Untagged => { + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_tuple( + __serializer, + #len)); + #(#serialize_stmts)* + _serde::ser::SerializeTuple::end(__serde_state) + } + } + } +} + +enum StructVariant<'a> { + ExternallyTagged { + variant_index: u32, + variant_name: String, + }, + InternallyTagged { + tag: &'a str, + variant_name: String, + }, + Untagged, +} + +fn serialize_struct_variant<'a>( + context: StructVariant<'a>, + params: &Parameters, + fields: &[Field], + name: &str, +) -> Fragment { + if fields.iter().any(|field| field.attrs.flatten()) { + return serialize_struct_variant_with_flatten(context, params, fields, name); + } + + let struct_trait = match context { + StructVariant::ExternallyTagged { .. } => StructTrait::SerializeStructVariant, + StructVariant::InternallyTagged { .. } | StructVariant::Untagged => { + StructTrait::SerializeStruct + } + }; + + let serialize_fields = serialize_struct_visitor(fields, params, true, &struct_trait); + + let mut serialized_fields = fields + .iter() + .filter(|&field| !field.attrs.skip_serializing()) + .peekable(); + + let let_mut = mut_if(serialized_fields.peek().is_some()); + + let len = serialized_fields + .map(|field| { + let member = &field.member; + + match field.attrs.skip_serializing_if() { + Some(path) => quote!(if #path(#member) { 0 } else { 1 }), + None => quote!(1), + } + }) + .fold(quote!(0), |sum, expr| quote!(#sum + #expr)); + + match context { + StructVariant::ExternallyTagged { + variant_index, + variant_name, + } => { + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_struct_variant( + __serializer, + #name, + #variant_index, + #variant_name, + #len, + )); + #(#serialize_fields)* + _serde::ser::SerializeStructVariant::end(__serde_state) + } + } + StructVariant::InternallyTagged { tag, variant_name } => { + quote_block! { + let mut __serde_state = try!(_serde::Serializer::serialize_struct( + __serializer, + #name, + #len + 1, + )); + try!(_serde::ser::SerializeStruct::serialize_field( + &mut __serde_state, + #tag, + #variant_name, + )); + #(#serialize_fields)* + _serde::ser::SerializeStruct::end(__serde_state) + } + } + StructVariant::Untagged => { + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_struct( + __serializer, + #name, + #len, + )); + #(#serialize_fields)* + _serde::ser::SerializeStruct::end(__serde_state) + } + } + } +} + +fn serialize_struct_variant_with_flatten<'a>( + context: StructVariant<'a>, + params: &Parameters, + fields: &[Field], + name: &str, +) -> Fragment { + let struct_trait = StructTrait::SerializeMap; + let serialize_fields = serialize_struct_visitor(fields, params, true, &struct_trait); + + let mut serialized_fields = fields + .iter() + .filter(|&field| !field.attrs.skip_serializing()) + .peekable(); + + let let_mut = mut_if(serialized_fields.peek().is_some()); + + match context { + StructVariant::ExternallyTagged { + variant_index, + variant_name, + } => { + let this = ¶ms.this; + let fields_ty = fields.iter().map(|f| &f.ty); + let members = &fields.iter().map(|f| &f.member).collect::<Vec<_>>(); + + let (_, ty_generics, where_clause) = params.generics.split_for_impl(); + let wrapper_generics = bound::with_lifetime_bound(¶ms.generics, "'__a"); + let (wrapper_impl_generics, wrapper_ty_generics, _) = wrapper_generics.split_for_impl(); + + quote_block! { + struct __EnumFlatten #wrapper_generics #where_clause { + data: (#(&'__a #fields_ty,)*), + phantom: _serde::__private::PhantomData<#this #ty_generics>, + } + + impl #wrapper_impl_generics _serde::Serialize for __EnumFlatten #wrapper_ty_generics #where_clause { + fn serialize<__S>(&self, __serializer: __S) -> _serde::__private::Result<__S::Ok, __S::Error> + where + __S: _serde::Serializer, + { + let (#(#members,)*) = self.data; + let #let_mut __serde_state = try!(_serde::Serializer::serialize_map( + __serializer, + _serde::__private::None)); + #(#serialize_fields)* + _serde::ser::SerializeMap::end(__serde_state) + } + } + + _serde::Serializer::serialize_newtype_variant( + __serializer, + #name, + #variant_index, + #variant_name, + &__EnumFlatten { + data: (#(#members,)*), + phantom: _serde::__private::PhantomData::<#this #ty_generics>, + }) + } + } + StructVariant::InternallyTagged { tag, variant_name } => { + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_map( + __serializer, + _serde::__private::None)); + try!(_serde::ser::SerializeMap::serialize_entry( + &mut __serde_state, + #tag, + #variant_name, + )); + #(#serialize_fields)* + _serde::ser::SerializeMap::end(__serde_state) + } + } + StructVariant::Untagged => { + quote_block! { + let #let_mut __serde_state = try!(_serde::Serializer::serialize_map( + __serializer, + _serde::__private::None)); + #(#serialize_fields)* + _serde::ser::SerializeMap::end(__serde_state) + } + } + } +} + +fn serialize_tuple_struct_visitor( + fields: &[Field], + params: &Parameters, + is_enum: bool, + tuple_trait: &TupleTrait, +) -> Vec<TokenStream> { + fields + .iter() + .enumerate() + .filter(|(_, field)| !field.attrs.skip_serializing()) + .map(|(i, field)| { + let mut field_expr = if is_enum { + let id = Ident::new(&format!("__field{}", i), Span::call_site()); + quote!(#id) + } else { + get_member( + params, + field, + &Member::Unnamed(Index { + index: i as u32, + span: Span::call_site(), + }), + ) + }; + + let skip = field + .attrs + .skip_serializing_if() + .map(|path| quote!(#path(#field_expr))); + + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let func = tuple_trait.serialize_element(span); + let ser = quote! { + try!(#func(&mut __serde_state, #field_expr)); + }; + + match skip { + None => ser, + Some(skip) => quote!(if !#skip { #ser }), + } + }) + .collect() +} + +fn serialize_struct_visitor( + fields: &[Field], + params: &Parameters, + is_enum: bool, + struct_trait: &StructTrait, +) -> Vec<TokenStream> { + fields + .iter() + .filter(|&field| !field.attrs.skip_serializing()) + .map(|field| { + let member = &field.member; + + let mut field_expr = if is_enum { + quote!(#member) + } else { + get_member(params, field, member) + }; + + let key_expr = field.attrs.name().serialize_name(); + + let skip = field + .attrs + .skip_serializing_if() + .map(|path| quote!(#path(#field_expr))); + + if let Some(path) = field.attrs.serialize_with() { + field_expr = wrap_serialize_field_with(params, field.ty, path, &field_expr); + } + + let span = field.original.span(); + let ser = if field.attrs.flatten() { + let func = quote_spanned!(span=> _serde::Serialize::serialize); + quote! { + try!(#func(&#field_expr, _serde::__private::ser::FlatMapSerializer(&mut __serde_state))); + } + } else { + let func = struct_trait.serialize_field(span); + quote! { + try!(#func(&mut __serde_state, #key_expr, #field_expr)); + } + }; + + match skip { + None => ser, + Some(skip) => { + if let Some(skip_func) = struct_trait.skip_field(span) { + quote! { + if !#skip { + #ser + } else { + try!(#skip_func(&mut __serde_state, #key_expr)); + } + } + } else { + quote! { + if !#skip { + #ser + } + } + } + } + } + }) + .collect() +} + +fn wrap_serialize_field_with( + params: &Parameters, + field_ty: &syn::Type, + serialize_with: &syn::ExprPath, + field_expr: &TokenStream, +) -> TokenStream { + wrap_serialize_with(params, serialize_with, &[field_ty], &[quote!(#field_expr)]) +} + +fn wrap_serialize_variant_with( + params: &Parameters, + serialize_with: &syn::ExprPath, + variant: &Variant, +) -> TokenStream { + let field_tys: Vec<_> = variant.fields.iter().map(|field| field.ty).collect(); + let field_exprs: Vec<_> = variant + .fields + .iter() + .map(|field| { + let id = match &field.member { + Member::Named(ident) => ident.clone(), + Member::Unnamed(member) => { + Ident::new(&format!("__field{}", member.index), Span::call_site()) + } + }; + quote!(#id) + }) + .collect(); + wrap_serialize_with( + params, + serialize_with, + field_tys.as_slice(), + field_exprs.as_slice(), + ) +} + +fn wrap_serialize_with( + params: &Parameters, + serialize_with: &syn::ExprPath, + field_tys: &[&syn::Type], + field_exprs: &[TokenStream], +) -> TokenStream { + let this = ¶ms.this; + let (_, ty_generics, where_clause) = params.generics.split_for_impl(); + + let wrapper_generics = if field_exprs.is_empty() { + params.generics.clone() + } else { + bound::with_lifetime_bound(¶ms.generics, "'__a") + }; + let (wrapper_impl_generics, wrapper_ty_generics, _) = wrapper_generics.split_for_impl(); + + let field_access = (0..field_exprs.len()).map(|n| { + Member::Unnamed(Index { + index: n as u32, + span: Span::call_site(), + }) + }); + + quote!({ + struct __SerializeWith #wrapper_impl_generics #where_clause { + values: (#(&'__a #field_tys, )*), + phantom: _serde::__private::PhantomData<#this #ty_generics>, + } + + impl #wrapper_impl_generics _serde::Serialize for __SerializeWith #wrapper_ty_generics #where_clause { + fn serialize<__S>(&self, __s: __S) -> _serde::__private::Result<__S::Ok, __S::Error> + where + __S: _serde::Serializer, + { + #serialize_with(#(self.values.#field_access, )* __s) + } + } + + &__SerializeWith { + values: (#(#field_exprs, )*), + phantom: _serde::__private::PhantomData::<#this #ty_generics>, + } + }) +} + +// Serialization of an empty struct results in code like: +// +// let mut __serde_state = try!(serializer.serialize_struct("S", 0)); +// _serde::ser::SerializeStruct::end(__serde_state) +// +// where we want to omit the `mut` to avoid a warning. +fn mut_if(is_mut: bool) -> Option<TokenStream> { + if is_mut { + Some(quote!(mut)) + } else { + None + } +} + +fn get_member(params: &Parameters, field: &Field, member: &Member) -> TokenStream { + let self_var = ¶ms.self_var; + match (params.is_remote, field.attrs.getter()) { + (false, None) => { + if params.is_packed { + quote!(&{#self_var.#member}) + } else { + quote!(&#self_var.#member) + } + } + (true, None) => { + let inner = if params.is_packed { + quote!(&{#self_var.#member}) + } else { + quote!(&#self_var.#member) + }; + let ty = field.ty; + quote!(_serde::__private::ser::constrain::<#ty>(#inner)) + } + (true, Some(getter)) => { + let ty = field.ty; + quote!(_serde::__private::ser::constrain::<#ty>(&#getter(#self_var))) + } + (false, Some(_)) => { + unreachable!("getter is only allowed for remote impls"); + } + } +} + +fn effective_style(variant: &Variant) -> Style { + match variant.style { + Style::Newtype if variant.fields[0].attrs.skip_serializing() => Style::Unit, + other => other, + } +} + +enum StructTrait { + SerializeMap, + SerializeStruct, + SerializeStructVariant, +} + +impl StructTrait { + fn serialize_field(&self, span: Span) -> TokenStream { + match *self { + StructTrait::SerializeMap => { + quote_spanned!(span=> _serde::ser::SerializeMap::serialize_entry) + } + StructTrait::SerializeStruct => { + quote_spanned!(span=> _serde::ser::SerializeStruct::serialize_field) + } + StructTrait::SerializeStructVariant => { + quote_spanned!(span=> _serde::ser::SerializeStructVariant::serialize_field) + } + } + } + + fn skip_field(&self, span: Span) -> Option<TokenStream> { + match *self { + StructTrait::SerializeMap => None, + StructTrait::SerializeStruct => { + Some(quote_spanned!(span=> _serde::ser::SerializeStruct::skip_field)) + } + StructTrait::SerializeStructVariant => { + Some(quote_spanned!(span=> _serde::ser::SerializeStructVariant::skip_field)) + } + } + } +} + +enum TupleTrait { + SerializeTuple, + SerializeTupleStruct, + SerializeTupleVariant, +} + +impl TupleTrait { + fn serialize_element(&self, span: Span) -> TokenStream { + match *self { + TupleTrait::SerializeTuple => { + quote_spanned!(span=> _serde::ser::SerializeTuple::serialize_element) + } + TupleTrait::SerializeTupleStruct => { + quote_spanned!(span=> _serde::ser::SerializeTupleStruct::serialize_field) + } + TupleTrait::SerializeTupleVariant => { + quote_spanned!(span=> _serde::ser::SerializeTupleVariant::serialize_field) + } + } + } +} diff --git a/vendor/serde_derive/src/try.rs b/vendor/serde_derive/src/try.rs new file mode 100644 index 000000000..48cceebaa --- /dev/null +++ b/vendor/serde_derive/src/try.rs @@ -0,0 +1,24 @@ +use proc_macro2::{Punct, Spacing, TokenStream}; + +// None of our generated code requires the `From::from` error conversion +// performed by the standard library's `try!` macro. With this simplified macro +// we see a significant improvement in type checking and borrow checking time of +// the generated code and a slight improvement in binary size. +pub fn replacement() -> TokenStream { + // Cannot pass `$expr` to `quote!` prior to Rust 1.17.0 so interpolate it. + let dollar = Punct::new('$', Spacing::Alone); + + quote! { + #[allow(unused_macros)] + macro_rules! try { + (#dollar __expr:expr) => { + match #dollar __expr { + _serde::__private::Ok(__val) => __val, + _serde::__private::Err(__err) => { + return _serde::__private::Err(__err); + } + } + } + } + } +} diff --git a/vendor/serde_json/.cargo-checksum.json b/vendor/serde_json/.cargo-checksum.json new file mode 100644 index 000000000..5415825f1 --- /dev/null +++ b/vendor/serde_json/.cargo-checksum.json @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/vendor/serde_json/CONTRIBUTING.md b/vendor/serde_json/CONTRIBUTING.md new file mode 100644 index 000000000..26e15783a --- /dev/null +++ b/vendor/serde_json/CONTRIBUTING.md @@ -0,0 +1,46 @@ +# Contributing to Serde + +Serde welcomes contribution from everyone in the form of suggestions, bug +reports, pull requests, and feedback. This document gives some guidance if you +are thinking of helping us. + +## Submitting bug reports and feature requests + +Serde development is spread across lots of repositories. In general, prefer to +open issues against the main [serde-rs/serde] repository unless the topic is +clearly specific to JSON. + +[serde-rs/serde]: https://github.com/serde-rs/serde + +When reporting a bug or asking for help, please include enough details so that +the people helping you can reproduce the behavior you are seeing. For some tips +on how to approach this, read about how to produce a [Minimal, Complete, and +Verifiable example]. + +[Minimal, Complete, and Verifiable example]: https://stackoverflow.com/help/mcve + +When making a feature request, please make it clear what problem you intend to +solve with the feature, any ideas for how Serde could support solving that +problem, any possible alternatives, and any disadvantages. + +## Running the test suite + +We encourage you to check that the test suite passes locally before submitting a +pull request with your changes. If anything does not pass, typically it will be +easier to iterate and fix it locally than waiting for the CI servers to run +tests for you. + +The test suite requires a nightly compiler. + +```sh +# Run the full test suite, including doc test and compile-tests +cargo test +``` + +## Conduct + +In all Serde-related forums, we follow the [Rust Code of Conduct]. For +escalation or moderation issues please contact Erick (erick.tryzelaar@gmail.com) +instead of the Rust moderation team. + +[Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct diff --git a/vendor/serde_json/Cargo.toml b/vendor/serde_json/Cargo.toml new file mode 100644 index 000000000..0fb0d05d8 --- /dev/null +++ b/vendor/serde_json/Cargo.toml @@ -0,0 +1,99 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +rust-version = "1.36" +name = "serde_json" +version = "1.0.82" +authors = [ + "Erick Tryzelaar <erick.tryzelaar@gmail.com>", + "David Tolnay <dtolnay@gmail.com>", +] +description = "A JSON serialization file format" +documentation = "https://docs.serde.rs/serde_json/" +readme = "README.md" +keywords = [ + "json", + "serde", + "serialization", +] +categories = ["encoding"] +license = "MIT OR Apache-2.0" +repository = "https://github.com/serde-rs/json" + +[package.metadata.docs.rs] +features = [ + "raw_value", + "unbounded_depth", +] +targets = ["x86_64-unknown-linux-gnu"] +rustdoc-args = [ + "--cfg", + "docsrs", +] + +[package.metadata.playground] +features = ["raw_value"] + +[dependencies.indexmap] +version = "1.5.2" +features = ["std"] +optional = true + +[dependencies.itoa] +version = "1.0" + +[dependencies.ryu] +version = "1.0" + +[dependencies.serde] +version = "1.0.100" +default-features = false + +[dev-dependencies.automod] +version = "1.0" + +[dev-dependencies.ref-cast] +version = "1.0" + +[dev-dependencies.rustversion] +version = "1.0" + +[dev-dependencies.serde] +version = "1.0.100" +features = ["derive"] + +[dev-dependencies.serde_bytes] +version = "0.11" + +[dev-dependencies.serde_derive] +version = "1.0" + +[dev-dependencies.serde_stacker] +version = "0.1" + +[dev-dependencies.trybuild] +version = "1.0.49" +features = ["diff"] + +[features] +alloc = ["serde/alloc"] +arbitrary_precision = [] +default = ["std"] +float_roundtrip = [] +preserve_order = [ + "indexmap", + "std", +] +raw_value = [] +std = ["serde/std"] +unbounded_depth = [] diff --git a/vendor/serde_json/LICENSE-APACHE b/vendor/serde_json/LICENSE-APACHE new file mode 100644 index 000000000..16fe87b06 --- /dev/null +++ b/vendor/serde_json/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/vendor/serde_json/README.md b/vendor/serde_json/README.md new file mode 100644 index 000000000..df58a47e4 --- /dev/null +++ b/vendor/serde_json/README.md @@ -0,0 +1,390 @@ +# Serde JSON   [![Build Status]][travis] [![Latest Version]][crates.io] [![Rustc Version 1.36+]][rustc] + +[Build Status]: https://img.shields.io/github/workflow/status/serde-rs/json/CI/master +[travis]: https://github.com/serde-rs/json/actions?query=branch%3Amaster +[Latest Version]: https://img.shields.io/crates/v/serde_json.svg +[crates.io]: https://crates.io/crates/serde\_json +[Rustc Version 1.36+]: https://img.shields.io/badge/rustc-1.36+-lightgray.svg +[rustc]: https://blog.rust-lang.org/2019/07/04/Rust-1.36.0.html + +**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.** + +--- + +```toml +[dependencies] +serde_json = "1.0" +``` + +You may be looking for: + +- [JSON API documentation](https://docs.serde.rs/serde_json/) +- [Serde API documentation](https://docs.serde.rs/serde/) +- [Detailed documentation about Serde](https://serde.rs/) +- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html) +- [Release notes](https://github.com/serde-rs/json/releases) + +JSON is a ubiquitous open-standard format that uses human-readable text to +transmit data objects consisting of key-value pairs. + +```json +{ + "name": "John Doe", + "age": 43, + "address": { + "street": "10 Downing Street", + "city": "London" + }, + "phones": [ + "+44 1234567", + "+44 2345678" + ] +} +``` + +There are three common ways that you might find yourself needing to work with +JSON data in Rust. + + - **As text data.** An unprocessed string of JSON data that you receive on an + HTTP endpoint, read from a file, or prepare to send to a remote server. + - **As an untyped or loosely typed representation.** Maybe you want to check + that some JSON data is valid before passing it on, but without knowing the + structure of what it contains. Or you want to do very basic manipulations + like insert a key in a particular spot. + - **As a strongly typed Rust data structure.** When you expect all or most of + your data to conform to a particular structure and want to get real work done + without JSON's loosey-goosey nature tripping you up. + +Serde JSON provides efficient, flexible, safe ways of converting data between +each of these representations. + +## Operating on untyped JSON values + +Any valid JSON data can be manipulated in the following recursive enum +representation. This data structure is [`serde_json::Value`][value]. + +```rust +enum Value { + Null, + Bool(bool), + Number(Number), + String(String), + Array(Vec<Value>), + Object(Map<String, Value>), +} +``` + +A string of JSON data can be parsed into a `serde_json::Value` by the +[`serde_json::from_str`][from_str] function. There is also +[`from_slice`][from_slice] for parsing from a byte slice &[u8] and +[`from_reader`][from_reader] for parsing from any `io::Read` like a File or a +TCP stream. + +<div align="right"> +<a href="https://play.rust-lang.org/?edition=2018&gist=d69d8e3156d4bb81c4461b60b772ab72" target="_blank"> +<img align="center" width="85" src="https://raw.githubusercontent.com/serde-rs/serde-rs.github.io/master/img/runtab.png"> +</a> +</div> + +```rust +use serde_json::{Result, Value}; + +fn untyped_example() -> Result<()> { + // Some JSON input data as a &str. Maybe this comes from the user. + let data = r#" + { + "name": "John Doe", + "age": 43, + "phones": [ + "+44 1234567", + "+44 2345678" + ] + }"#; + + // Parse the string of data into serde_json::Value. + let v: Value = serde_json::from_str(data)?; + + // Access parts of the data by indexing with square brackets. + println!("Please call {} at the number {}", v["name"], v["phones"][0]); + + Ok(()) +} +``` + +The result of square bracket indexing like `v["name"]` is a borrow of the data +at that index, so the type is `&Value`. A JSON map can be indexed with string +keys, while a JSON array can be indexed with integer keys. If the type of the +data is not right for the type with which it is being indexed, or if a map does +not contain the key being indexed, or if the index into a vector is out of +bounds, the returned element is `Value::Null`. + +When a `Value` is printed, it is printed as a JSON string. So in the code above, +the output looks like `Please call "John Doe" at the number "+44 1234567"`. The +quotation marks appear because `v["name"]` is a `&Value` containing a JSON +string and its JSON representation is `"John Doe"`. Printing as a plain string +without quotation marks involves converting from a JSON string to a Rust string +with [`as_str()`] or avoiding the use of `Value` as described in the following +section. + +[`as_str()`]: https://docs.serde.rs/serde_json/enum.Value.html#method.as_str + +The `Value` representation is sufficient for very basic tasks but can be tedious +to work with for anything more significant. Error handling is verbose to +implement correctly, for example imagine trying to detect the presence of +unrecognized fields in the input data. The compiler is powerless to help you +when you make a mistake, for example imagine typoing `v["name"]` as `v["nmae"]` +in one of the dozens of places it is used in your code. + +## Parsing JSON as strongly typed data structures + +Serde provides a powerful way of mapping JSON data into Rust data structures +largely automatically. + +<div align="right"> +<a href="https://play.rust-lang.org/?edition=2018&gist=15cfab66d38ff8a15a9cf1d8d897ac68" target="_blank"> +<img align="center" width="85" src="https://raw.githubusercontent.com/serde-rs/serde-rs.github.io/master/img/runtab.png"> +</a> +</div> + +```rust +use serde::{Deserialize, Serialize}; +use serde_json::Result; + +#[derive(Serialize, Deserialize)] +struct Person { + name: String, + age: u8, + phones: Vec<String>, +} + +fn typed_example() -> Result<()> { + // Some JSON input data as a &str. Maybe this comes from the user. + let data = r#" + { + "name": "John Doe", + "age": 43, + "phones": [ + "+44 1234567", + "+44 2345678" + ] + }"#; + + // Parse the string of data into a Person object. This is exactly the + // same function as the one that produced serde_json::Value above, but + // now we are asking it for a Person as output. + let p: Person = serde_json::from_str(data)?; + + // Do things just like with any other Rust data structure. + println!("Please call {} at the number {}", p.name, p.phones[0]); + + Ok(()) +} +``` + +This is the same `serde_json::from_str` function as before, but this time we +assign the return value to a variable of type `Person` so Serde will +automatically interpret the input data as a `Person` and produce informative +error messages if the layout does not conform to what a `Person` is expected to +look like. + +Any type that implements Serde's `Deserialize` trait can be deserialized this +way. This includes built-in Rust standard library types like `Vec<T>` and +`HashMap<K, V>`, as well as any structs or enums annotated with +`#[derive(Deserialize)]`. + +Once we have `p` of type `Person`, our IDE and the Rust compiler can help us use +it correctly like they do for any other Rust code. The IDE can autocomplete +field names to prevent typos, which was impossible in the `serde_json::Value` +representation. And the Rust compiler can check that when we write +`p.phones[0]`, then `p.phones` is guaranteed to be a `Vec<String>` so indexing +into it makes sense and produces a `String`. + +The necessary setup for using Serde's derive macros is explained on the *[Using +derive]* page of the Serde site. + +[Using derive]: https://serde.rs/derive.html + +## Constructing JSON values + +Serde JSON provides a [`json!` macro][macro] to build `serde_json::Value` +objects with very natural JSON syntax. + +<div align="right"> +<a href="https://play.rust-lang.org/?edition=2018&gist=6ccafad431d72b62e77cc34c8e879b24" target="_blank"> +<img align="center" width="85" src="https://raw.githubusercontent.com/serde-rs/serde-rs.github.io/master/img/runtab.png"> +</a> +</div> + +```rust +use serde_json::json; + +fn main() { + // The type of `john` is `serde_json::Value` + let john = json!({ + "name": "John Doe", + "age": 43, + "phones": [ + "+44 1234567", + "+44 2345678" + ] + }); + + println!("first phone number: {}", john["phones"][0]); + + // Convert to a string of JSON and print it out + println!("{}", john.to_string()); +} +``` + +The `Value::to_string()` function converts a `serde_json::Value` into a `String` +of JSON text. + +One neat thing about the `json!` macro is that variables and expressions can be +interpolated directly into the JSON value as you are building it. Serde will +check at compile time that the value you are interpolating is able to be +represented as JSON. + +<div align="right"> +<a href="https://play.rust-lang.org/?edition=2018&gist=f9101a6e61dfc9e02c6a67f315ed24f2" target="_blank"> +<img align="center" width="85" src="https://raw.githubusercontent.com/serde-rs/serde-rs.github.io/master/img/runtab.png"> +</a> +</div> + +```rust +let full_name = "John Doe"; +let age_last_year = 42; + +// The type of `john` is `serde_json::Value` +let john = json!({ + "name": full_name, + "age": age_last_year + 1, + "phones": [ + format!("+44 {}", random_phone()) + ] +}); +``` + +This is amazingly convenient, but we have the problem we had before with +`Value`: the IDE and Rust compiler cannot help us if we get it wrong. Serde JSON +provides a better way of serializing strongly-typed data structures into JSON +text. + +## Creating JSON by serializing data structures + +A data structure can be converted to a JSON string by +[`serde_json::to_string`][to_string]. There is also +[`serde_json::to_vec`][to_vec] which serializes to a `Vec<u8>` and +[`serde_json::to_writer`][to_writer] which serializes to any `io::Write` +such as a File or a TCP stream. + +<div align="right"> +<a href="https://play.rust-lang.org/?edition=2018&gist=3472242a08ed2ff88a944f2a2283b0ee" target="_blank"> +<img align="center" width="85" src="https://raw.githubusercontent.com/serde-rs/serde-rs.github.io/master/img/runtab.png"> +</a> +</div> + +```rust +use serde::{Deserialize, Serialize}; +use serde_json::Result; + +#[derive(Serialize, Deserialize)] +struct Address { + street: String, + city: String, +} + +fn print_an_address() -> Result<()> { + // Some data structure. + let address = Address { + street: "10 Downing Street".to_owned(), + city: "London".to_owned(), + }; + + // Serialize it to a JSON string. + let j = serde_json::to_string(&address)?; + + // Print, write to a file, or send to an HTTP server. + println!("{}", j); + + Ok(()) +} +``` + +Any type that implements Serde's `Serialize` trait can be serialized this way. +This includes built-in Rust standard library types like `Vec<T>` and `HashMap<K, +V>`, as well as any structs or enums annotated with `#[derive(Serialize)]`. + +## Performance + +It is fast. You should expect in the ballpark of 500 to 1000 megabytes per +second deserialization and 600 to 900 megabytes per second serialization, +depending on the characteristics of your data. This is competitive with the +fastest C and C++ JSON libraries or even 30% faster for many use cases. +Benchmarks live in the [serde-rs/json-benchmark] repo. + +[serde-rs/json-benchmark]: https://github.com/serde-rs/json-benchmark + +## Getting help + +Serde is one of the most widely used Rust libraries, so any place that +Rustaceans congregate will be able to help you out. For chat, consider trying +the [#rust-questions] or [#rust-beginners] channels of the unofficial community +Discord (invite: <https://discord.gg/rust-lang-community>), the [#rust-usage] or +[#beginners] channels of the official Rust Project Discord (invite: +<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For +asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the +[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust +[Discourse forum][discourse]. It's acceptable to file a support issue in this +repo, but they tend not to get as many eyes as any of the above and may get +closed without a response after some time. + +[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513 +[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281 +[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848 +[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612 +[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general +[stackoverflow]: https://stackoverflow.com/questions/tagged/rust +[/r/rust]: https://www.reddit.com/r/rust +[discourse]: https://users.rust-lang.org + +## No-std support + +As long as there is a memory allocator, it is possible to use serde_json without +the rest of the Rust standard library. This is supported on Rust 1.36+. Disable +the default "std" feature and enable the "alloc" feature: + +```toml +[dependencies] +serde_json = { version = "1.0", default-features = false, features = ["alloc"] } +``` + +For JSON support in Serde without a memory allocator, please see the +[`serde-json-core`] crate. + +[`serde-json-core`]: https://github.com/rust-embedded-community/serde-json-core + +[value]: https://docs.serde.rs/serde_json/value/enum.Value.html +[from_str]: https://docs.serde.rs/serde_json/de/fn.from_str.html +[from_slice]: https://docs.serde.rs/serde_json/de/fn.from_slice.html +[from_reader]: https://docs.serde.rs/serde_json/de/fn.from_reader.html +[to_string]: https://docs.serde.rs/serde_json/ser/fn.to_string.html +[to_vec]: https://docs.serde.rs/serde_json/ser/fn.to_vec.html +[to_writer]: https://docs.serde.rs/serde_json/ser/fn.to_writer.html +[macro]: https://docs.serde.rs/serde_json/macro.json.html + +<br> + +#### License + +<sup> +Licensed under either of <a href="LICENSE-APACHE">Apache License, Version +2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option. +</sup> + +<br> + +<sub> +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in this crate by you, as defined in the Apache-2.0 license, shall +be dual licensed as above, without any additional terms or conditions. +</sub> diff --git a/vendor/serde_json/build.rs b/vendor/serde_json/build.rs new file mode 100644 index 000000000..e9ec7d56a --- /dev/null +++ b/vendor/serde_json/build.rs @@ -0,0 +1,52 @@ +use std::env; +use std::process::Command; +use std::str::{self, FromStr}; + +fn main() { + // Decide ideal limb width for arithmetic in the float parser. Refer to + // src/lexical/math.rs for where this has an effect. + let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap(); + match target_arch.as_str() { + "aarch64" | "mips64" | "powerpc64" | "x86_64" => { + println!("cargo:rustc-cfg=limb_width_64"); + } + _ => { + println!("cargo:rustc-cfg=limb_width_32"); + } + } + + let minor = match rustc_minor_version() { + Some(minor) => minor, + None => return, + }; + + // BTreeMap::get_key_value + // https://blog.rust-lang.org/2019/12/19/Rust-1.40.0.html#additions-to-the-standard-library + if minor < 40 { + println!("cargo:rustc-cfg=no_btreemap_get_key_value"); + } + + // BTreeMap::remove_entry + // https://blog.rust-lang.org/2020/07/16/Rust-1.45.0.html#library-changes + if minor < 45 { + println!("cargo:rustc-cfg=no_btreemap_remove_entry"); + } + + // BTreeMap::retain + // https://blog.rust-lang.org/2021/06/17/Rust-1.53.0.html#stabilized-apis + if minor < 53 { + println!("cargo:rustc-cfg=no_btreemap_retain"); + } +} + +fn rustc_minor_version() -> Option<u32> { + let rustc = env::var_os("RUSTC")?; + let output = Command::new(rustc).arg("--version").output().ok()?; + let version = str::from_utf8(&output.stdout).ok()?; + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + let next = pieces.next()?; + u32::from_str(next).ok() +} diff --git a/vendor/serde_json/src/de.rs b/vendor/serde_json/src/de.rs new file mode 100644 index 000000000..ffd0d48c2 --- /dev/null +++ b/vendor/serde_json/src/de.rs @@ -0,0 +1,2614 @@ +//! Deserialize JSON data to a Rust data structure. + +use crate::error::{Error, ErrorCode, Result}; +#[cfg(feature = "float_roundtrip")] +use crate::lexical; +use crate::number::Number; +use crate::read::{self, Fused, Reference}; +use alloc::string::String; +use alloc::vec::Vec; +#[cfg(feature = "float_roundtrip")] +use core::iter; +use core::iter::FusedIterator; +use core::marker::PhantomData; +use core::result; +use core::str::FromStr; +use serde::de::{self, Expected, Unexpected}; +use serde::{forward_to_deserialize_any, serde_if_integer128}; + +#[cfg(feature = "arbitrary_precision")] +use crate::number::NumberDeserializer; + +pub use crate::read::{Read, SliceRead, StrRead}; + +#[cfg(feature = "std")] +pub use crate::read::IoRead; + +////////////////////////////////////////////////////////////////////////////// + +/// A structure that deserializes JSON into Rust values. +pub struct Deserializer<R> { + read: R, + scratch: Vec<u8>, + remaining_depth: u8, + #[cfg(feature = "float_roundtrip")] + single_precision: bool, + #[cfg(feature = "unbounded_depth")] + disable_recursion_limit: bool, +} + +impl<'de, R> Deserializer<R> +where + R: read::Read<'de>, +{ + /// Create a JSON deserializer from one of the possible serde_json input + /// sources. + /// + /// Typically it is more convenient to use one of these methods instead: + /// + /// - Deserializer::from_str + /// - Deserializer::from_slice + /// - Deserializer::from_reader + pub fn new(read: R) -> Self { + Deserializer { + read, + scratch: Vec::new(), + remaining_depth: 128, + #[cfg(feature = "float_roundtrip")] + single_precision: false, + #[cfg(feature = "unbounded_depth")] + disable_recursion_limit: false, + } + } +} + +#[cfg(feature = "std")] +impl<R> Deserializer<read::IoRead<R>> +where + R: crate::io::Read, +{ + /// Creates a JSON deserializer from an `io::Read`. + /// + /// Reader-based deserializers do not support deserializing borrowed types + /// like `&str`, since the `std::io::Read` trait has no non-copying methods + /// -- everything it does involves copying bytes out of the data source. + pub fn from_reader(reader: R) -> Self { + Deserializer::new(read::IoRead::new(reader)) + } +} + +impl<'a> Deserializer<read::SliceRead<'a>> { + /// Creates a JSON deserializer from a `&[u8]`. + pub fn from_slice(bytes: &'a [u8]) -> Self { + Deserializer::new(read::SliceRead::new(bytes)) + } +} + +impl<'a> Deserializer<read::StrRead<'a>> { + /// Creates a JSON deserializer from a `&str`. + pub fn from_str(s: &'a str) -> Self { + Deserializer::new(read::StrRead::new(s)) + } +} + +macro_rules! overflow { + ($a:ident * 10 + $b:ident, $c:expr) => { + match $c { + c => $a >= c / 10 && ($a > c / 10 || $b > c % 10), + } + }; +} + +pub(crate) enum ParserNumber { + F64(f64), + U64(u64), + I64(i64), + #[cfg(feature = "arbitrary_precision")] + String(String), +} + +impl ParserNumber { + fn visit<'de, V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + match self { + ParserNumber::F64(x) => visitor.visit_f64(x), + ParserNumber::U64(x) => visitor.visit_u64(x), + ParserNumber::I64(x) => visitor.visit_i64(x), + #[cfg(feature = "arbitrary_precision")] + ParserNumber::String(x) => visitor.visit_map(NumberDeserializer { number: x.into() }), + } + } + + fn invalid_type(self, exp: &dyn Expected) -> Error { + match self { + ParserNumber::F64(x) => de::Error::invalid_type(Unexpected::Float(x), exp), + ParserNumber::U64(x) => de::Error::invalid_type(Unexpected::Unsigned(x), exp), + ParserNumber::I64(x) => de::Error::invalid_type(Unexpected::Signed(x), exp), + #[cfg(feature = "arbitrary_precision")] + ParserNumber::String(_) => de::Error::invalid_type(Unexpected::Other("number"), exp), + } + } +} + +impl<'de, R: Read<'de>> Deserializer<R> { + /// The `Deserializer::end` method should be called after a value has been fully deserialized. + /// This allows the `Deserializer` to validate that the input stream is at the end or that it + /// only has trailing whitespace. + pub fn end(&mut self) -> Result<()> { + match tri!(self.parse_whitespace()) { + Some(_) => Err(self.peek_error(ErrorCode::TrailingCharacters)), + None => Ok(()), + } + } + + /// Turn a JSON deserializer into an iterator over values of type T. + pub fn into_iter<T>(self) -> StreamDeserializer<'de, R, T> + where + T: de::Deserialize<'de>, + { + // This cannot be an implementation of std::iter::IntoIterator because + // we need the caller to choose what T is. + let offset = self.read.byte_offset(); + StreamDeserializer { + de: self, + offset, + failed: false, + output: PhantomData, + lifetime: PhantomData, + } + } + + /// Parse arbitrarily deep JSON structures without any consideration for + /// overflowing the stack. + /// + /// You will want to provide some other way to protect against stack + /// overflows, such as by wrapping your Deserializer in the dynamically + /// growing stack adapter provided by the serde_stacker crate. Additionally + /// you will need to be careful around other recursive operations on the + /// parsed result which may overflow the stack after deserialization has + /// completed, including, but not limited to, Display and Debug and Drop + /// impls. + /// + /// *This method is only available if serde_json is built with the + /// `"unbounded_depth"` feature.* + /// + /// # Examples + /// + /// ``` + /// use serde::Deserialize; + /// use serde_json::Value; + /// + /// fn main() { + /// let mut json = String::new(); + /// for _ in 0..10000 { + /// json = format!("[{}]", json); + /// } + /// + /// let mut deserializer = serde_json::Deserializer::from_str(&json); + /// deserializer.disable_recursion_limit(); + /// let deserializer = serde_stacker::Deserializer::new(&mut deserializer); + /// let value = Value::deserialize(deserializer).unwrap(); + /// + /// carefully_drop_nested_arrays(value); + /// } + /// + /// fn carefully_drop_nested_arrays(value: Value) { + /// let mut stack = vec![value]; + /// while let Some(value) = stack.pop() { + /// if let Value::Array(array) = value { + /// stack.extend(array); + /// } + /// } + /// } + /// ``` + #[cfg(feature = "unbounded_depth")] + #[cfg_attr(docsrs, doc(cfg(feature = "unbounded_depth")))] + pub fn disable_recursion_limit(&mut self) { + self.disable_recursion_limit = true; + } + + fn peek(&mut self) -> Result<Option<u8>> { + self.read.peek() + } + + fn peek_or_null(&mut self) -> Result<u8> { + Ok(tri!(self.peek()).unwrap_or(b'\x00')) + } + + fn eat_char(&mut self) { + self.read.discard(); + } + + fn next_char(&mut self) -> Result<Option<u8>> { + self.read.next() + } + + fn next_char_or_null(&mut self) -> Result<u8> { + Ok(tri!(self.next_char()).unwrap_or(b'\x00')) + } + + /// Error caused by a byte from next_char(). + #[cold] + fn error(&self, reason: ErrorCode) -> Error { + let position = self.read.position(); + Error::syntax(reason, position.line, position.column) + } + + /// Error caused by a byte from peek(). + #[cold] + fn peek_error(&self, reason: ErrorCode) -> Error { + let position = self.read.peek_position(); + Error::syntax(reason, position.line, position.column) + } + + /// Returns the first non-whitespace byte without consuming it, or `None` if + /// EOF is encountered. + fn parse_whitespace(&mut self) -> Result<Option<u8>> { + loop { + match tri!(self.peek()) { + Some(b' ') | Some(b'\n') | Some(b'\t') | Some(b'\r') => { + self.eat_char(); + } + other => { + return Ok(other); + } + } + } + } + + #[cold] + fn peek_invalid_type(&mut self, exp: &dyn Expected) -> Error { + let err = match self.peek_or_null().unwrap_or(b'\x00') { + b'n' => { + self.eat_char(); + if let Err(err) = self.parse_ident(b"ull") { + return err; + } + de::Error::invalid_type(Unexpected::Unit, exp) + } + b't' => { + self.eat_char(); + if let Err(err) = self.parse_ident(b"rue") { + return err; + } + de::Error::invalid_type(Unexpected::Bool(true), exp) + } + b'f' => { + self.eat_char(); + if let Err(err) = self.parse_ident(b"alse") { + return err; + } + de::Error::invalid_type(Unexpected::Bool(false), exp) + } + b'-' => { + self.eat_char(); + match self.parse_any_number(false) { + Ok(n) => n.invalid_type(exp), + Err(err) => return err, + } + } + b'0'..=b'9' => match self.parse_any_number(true) { + Ok(n) => n.invalid_type(exp), + Err(err) => return err, + }, + b'"' => { + self.eat_char(); + self.scratch.clear(); + match self.read.parse_str(&mut self.scratch) { + Ok(s) => de::Error::invalid_type(Unexpected::Str(&s), exp), + Err(err) => return err, + } + } + b'[' => de::Error::invalid_type(Unexpected::Seq, exp), + b'{' => de::Error::invalid_type(Unexpected::Map, exp), + _ => self.peek_error(ErrorCode::ExpectedSomeValue), + }; + + self.fix_position(err) + } + + fn deserialize_number<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'-' => { + self.eat_char(); + tri!(self.parse_integer(false)).visit(visitor) + } + b'0'..=b'9' => tri!(self.parse_integer(true)).visit(visitor), + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + serde_if_integer128! { + fn scan_integer128(&mut self, buf: &mut String) -> Result<()> { + match tri!(self.next_char_or_null()) { + b'0' => { + buf.push('0'); + // There can be only one leading '0'. + match tri!(self.peek_or_null()) { + b'0'..=b'9' => { + Err(self.peek_error(ErrorCode::InvalidNumber)) + } + _ => Ok(()), + } + } + c @ b'1'..=b'9' => { + buf.push(c as char); + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + buf.push(c as char); + } + Ok(()) + } + _ => { + Err(self.error(ErrorCode::InvalidNumber)) + } + } + } + } + + #[cold] + fn fix_position(&self, err: Error) -> Error { + err.fix_position(move |code| self.error(code)) + } + + fn parse_ident(&mut self, ident: &[u8]) -> Result<()> { + for expected in ident { + match tri!(self.next_char()) { + None => { + return Err(self.error(ErrorCode::EofWhileParsingValue)); + } + Some(next) => { + if next != *expected { + return Err(self.error(ErrorCode::ExpectedSomeIdent)); + } + } + } + } + + Ok(()) + } + + fn parse_integer(&mut self, positive: bool) -> Result<ParserNumber> { + let next = match tri!(self.next_char()) { + Some(b) => b, + None => { + return Err(self.error(ErrorCode::EofWhileParsingValue)); + } + }; + + match next { + b'0' => { + // There can be only one leading '0'. + match tri!(self.peek_or_null()) { + b'0'..=b'9' => Err(self.peek_error(ErrorCode::InvalidNumber)), + _ => self.parse_number(positive, 0), + } + } + c @ b'1'..=b'9' => { + let mut significand = (c - b'0') as u64; + + loop { + match tri!(self.peek_or_null()) { + c @ b'0'..=b'9' => { + let digit = (c - b'0') as u64; + + // We need to be careful with overflow. If we can, + // try to keep the number as a `u64` until we grow + // too large. At that point, switch to parsing the + // value as a `f64`. + if overflow!(significand * 10 + digit, u64::max_value()) { + return Ok(ParserNumber::F64(tri!( + self.parse_long_integer(positive, significand), + ))); + } + + self.eat_char(); + significand = significand * 10 + digit; + } + _ => { + return self.parse_number(positive, significand); + } + } + } + } + _ => Err(self.error(ErrorCode::InvalidNumber)), + } + } + + fn parse_number(&mut self, positive: bool, significand: u64) -> Result<ParserNumber> { + Ok(match tri!(self.peek_or_null()) { + b'.' => ParserNumber::F64(tri!(self.parse_decimal(positive, significand, 0))), + b'e' | b'E' => ParserNumber::F64(tri!(self.parse_exponent(positive, significand, 0))), + _ => { + if positive { + ParserNumber::U64(significand) + } else { + let neg = (significand as i64).wrapping_neg(); + + // Convert into a float if we underflow, or on `-0`. + if neg >= 0 { + ParserNumber::F64(-(significand as f64)) + } else { + ParserNumber::I64(neg) + } + } + } + }) + } + + fn parse_decimal( + &mut self, + positive: bool, + mut significand: u64, + mut exponent: i32, + ) -> Result<f64> { + self.eat_char(); + + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + let digit = (c - b'0') as u64; + + if overflow!(significand * 10 + digit, u64::max_value()) { + return self.parse_decimal_overflow(positive, significand, exponent); + } + + self.eat_char(); + significand = significand * 10 + digit; + exponent -= 1; + } + + // Error if there is not at least one digit after the decimal point. + if exponent == 0 { + match tri!(self.peek()) { + Some(_) => return Err(self.peek_error(ErrorCode::InvalidNumber)), + None => return Err(self.peek_error(ErrorCode::EofWhileParsingValue)), + } + } + + match tri!(self.peek_or_null()) { + b'e' | b'E' => self.parse_exponent(positive, significand, exponent), + _ => self.f64_from_parts(positive, significand, exponent), + } + } + + fn parse_exponent( + &mut self, + positive: bool, + significand: u64, + starting_exp: i32, + ) -> Result<f64> { + self.eat_char(); + + let positive_exp = match tri!(self.peek_or_null()) { + b'+' => { + self.eat_char(); + true + } + b'-' => { + self.eat_char(); + false + } + _ => true, + }; + + let next = match tri!(self.next_char()) { + Some(b) => b, + None => { + return Err(self.error(ErrorCode::EofWhileParsingValue)); + } + }; + + // Make sure a digit follows the exponent place. + let mut exp = match next { + c @ b'0'..=b'9' => (c - b'0') as i32, + _ => { + return Err(self.error(ErrorCode::InvalidNumber)); + } + }; + + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + let digit = (c - b'0') as i32; + + if overflow!(exp * 10 + digit, i32::max_value()) { + let zero_significand = significand == 0; + return self.parse_exponent_overflow(positive, zero_significand, positive_exp); + } + + exp = exp * 10 + digit; + } + + let final_exp = if positive_exp { + starting_exp.saturating_add(exp) + } else { + starting_exp.saturating_sub(exp) + }; + + self.f64_from_parts(positive, significand, final_exp) + } + + #[cfg(feature = "float_roundtrip")] + fn f64_from_parts(&mut self, positive: bool, significand: u64, exponent: i32) -> Result<f64> { + let f = if self.single_precision { + lexical::parse_concise_float::<f32>(significand, exponent) as f64 + } else { + lexical::parse_concise_float::<f64>(significand, exponent) + }; + + if f.is_infinite() { + Err(self.error(ErrorCode::NumberOutOfRange)) + } else { + Ok(if positive { f } else { -f }) + } + } + + #[cfg(not(feature = "float_roundtrip"))] + fn f64_from_parts( + &mut self, + positive: bool, + significand: u64, + mut exponent: i32, + ) -> Result<f64> { + let mut f = significand as f64; + loop { + match POW10.get(exponent.wrapping_abs() as usize) { + Some(&pow) => { + if exponent >= 0 { + f *= pow; + if f.is_infinite() { + return Err(self.error(ErrorCode::NumberOutOfRange)); + } + } else { + f /= pow; + } + break; + } + None => { + if f == 0.0 { + break; + } + if exponent >= 0 { + return Err(self.error(ErrorCode::NumberOutOfRange)); + } + f /= 1e308; + exponent += 308; + } + } + } + Ok(if positive { f } else { -f }) + } + + #[cfg(feature = "float_roundtrip")] + #[cold] + #[inline(never)] + fn parse_long_integer(&mut self, positive: bool, partial_significand: u64) -> Result<f64> { + // To deserialize floats we'll first push the integer and fraction + // parts, both as byte strings, into the scratch buffer and then feed + // both slices to lexical's parser. For example if the input is + // `12.34e5` we'll push b"1234" into scratch and then pass b"12" and + // b"34" to lexical. `integer_end` will be used to track where to split + // the scratch buffer. + // + // Note that lexical expects the integer part to contain *no* leading + // zeroes and the fraction part to contain *no* trailing zeroes. The + // first requirement is already handled by the integer parsing logic. + // The second requirement will be enforced just before passing the + // slices to lexical in f64_long_from_parts. + self.scratch.clear(); + self.scratch + .extend_from_slice(itoa::Buffer::new().format(partial_significand).as_bytes()); + + loop { + match tri!(self.peek_or_null()) { + c @ b'0'..=b'9' => { + self.scratch.push(c); + self.eat_char(); + } + b'.' => { + self.eat_char(); + return self.parse_long_decimal(positive, self.scratch.len()); + } + b'e' | b'E' => { + return self.parse_long_exponent(positive, self.scratch.len()); + } + _ => { + return self.f64_long_from_parts(positive, self.scratch.len(), 0); + } + } + } + } + + #[cfg(not(feature = "float_roundtrip"))] + #[cold] + #[inline(never)] + fn parse_long_integer(&mut self, positive: bool, significand: u64) -> Result<f64> { + let mut exponent = 0; + loop { + match tri!(self.peek_or_null()) { + b'0'..=b'9' => { + self.eat_char(); + // This could overflow... if your integer is gigabytes long. + // Ignore that possibility. + exponent += 1; + } + b'.' => { + return self.parse_decimal(positive, significand, exponent); + } + b'e' | b'E' => { + return self.parse_exponent(positive, significand, exponent); + } + _ => { + return self.f64_from_parts(positive, significand, exponent); + } + } + } + } + + #[cfg(feature = "float_roundtrip")] + #[cold] + fn parse_long_decimal(&mut self, positive: bool, integer_end: usize) -> Result<f64> { + let mut at_least_one_digit = integer_end < self.scratch.len(); + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + self.scratch.push(c); + self.eat_char(); + at_least_one_digit = true; + } + + if !at_least_one_digit { + match tri!(self.peek()) { + Some(_) => return Err(self.peek_error(ErrorCode::InvalidNumber)), + None => return Err(self.peek_error(ErrorCode::EofWhileParsingValue)), + } + } + + match tri!(self.peek_or_null()) { + b'e' | b'E' => self.parse_long_exponent(positive, integer_end), + _ => self.f64_long_from_parts(positive, integer_end, 0), + } + } + + #[cfg(feature = "float_roundtrip")] + fn parse_long_exponent(&mut self, positive: bool, integer_end: usize) -> Result<f64> { + self.eat_char(); + + let positive_exp = match tri!(self.peek_or_null()) { + b'+' => { + self.eat_char(); + true + } + b'-' => { + self.eat_char(); + false + } + _ => true, + }; + + let next = match tri!(self.next_char()) { + Some(b) => b, + None => { + return Err(self.error(ErrorCode::EofWhileParsingValue)); + } + }; + + // Make sure a digit follows the exponent place. + let mut exp = match next { + c @ b'0'..=b'9' => (c - b'0') as i32, + _ => { + return Err(self.error(ErrorCode::InvalidNumber)); + } + }; + + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + let digit = (c - b'0') as i32; + + if overflow!(exp * 10 + digit, i32::max_value()) { + let zero_significand = self.scratch.iter().all(|&digit| digit == b'0'); + return self.parse_exponent_overflow(positive, zero_significand, positive_exp); + } + + exp = exp * 10 + digit; + } + + let final_exp = if positive_exp { exp } else { -exp }; + + self.f64_long_from_parts(positive, integer_end, final_exp) + } + + // This cold code should not be inlined into the middle of the hot + // decimal-parsing loop above. + #[cfg(feature = "float_roundtrip")] + #[cold] + #[inline(never)] + fn parse_decimal_overflow( + &mut self, + positive: bool, + significand: u64, + exponent: i32, + ) -> Result<f64> { + let mut buffer = itoa::Buffer::new(); + let significand = buffer.format(significand); + let fraction_digits = -exponent as usize; + self.scratch.clear(); + if let Some(zeros) = fraction_digits.checked_sub(significand.len() + 1) { + self.scratch.extend(iter::repeat(b'0').take(zeros + 1)); + } + self.scratch.extend_from_slice(significand.as_bytes()); + let integer_end = self.scratch.len() - fraction_digits; + self.parse_long_decimal(positive, integer_end) + } + + #[cfg(not(feature = "float_roundtrip"))] + #[cold] + #[inline(never)] + fn parse_decimal_overflow( + &mut self, + positive: bool, + significand: u64, + exponent: i32, + ) -> Result<f64> { + // The next multiply/add would overflow, so just ignore all further + // digits. + while let b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + } + + match tri!(self.peek_or_null()) { + b'e' | b'E' => self.parse_exponent(positive, significand, exponent), + _ => self.f64_from_parts(positive, significand, exponent), + } + } + + // This cold code should not be inlined into the middle of the hot + // exponent-parsing loop above. + #[cold] + #[inline(never)] + fn parse_exponent_overflow( + &mut self, + positive: bool, + zero_significand: bool, + positive_exp: bool, + ) -> Result<f64> { + // Error instead of +/- infinity. + if !zero_significand && positive_exp { + return Err(self.error(ErrorCode::NumberOutOfRange)); + } + + while let b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + } + Ok(if positive { 0.0 } else { -0.0 }) + } + + #[cfg(feature = "float_roundtrip")] + fn f64_long_from_parts( + &mut self, + positive: bool, + integer_end: usize, + exponent: i32, + ) -> Result<f64> { + let integer = &self.scratch[..integer_end]; + let fraction = &self.scratch[integer_end..]; + + let f = if self.single_precision { + lexical::parse_truncated_float::<f32>(integer, fraction, exponent) as f64 + } else { + lexical::parse_truncated_float::<f64>(integer, fraction, exponent) + }; + + if f.is_infinite() { + Err(self.error(ErrorCode::NumberOutOfRange)) + } else { + Ok(if positive { f } else { -f }) + } + } + + fn parse_any_signed_number(&mut self) -> Result<ParserNumber> { + let peek = match tri!(self.peek()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'-' => { + self.eat_char(); + self.parse_any_number(false) + } + b'0'..=b'9' => self.parse_any_number(true), + _ => Err(self.peek_error(ErrorCode::InvalidNumber)), + }; + + let value = match tri!(self.peek()) { + Some(_) => Err(self.peek_error(ErrorCode::InvalidNumber)), + None => value, + }; + + match value { + Ok(value) => Ok(value), + // The de::Error impl creates errors with unknown line and column. + // Fill in the position here by looking at the current index in the + // input. There is no way to tell whether this should call `error` + // or `peek_error` so pick the one that seems correct more often. + // Worst case, the position is off by one character. + Err(err) => Err(self.fix_position(err)), + } + } + + #[cfg(not(feature = "arbitrary_precision"))] + fn parse_any_number(&mut self, positive: bool) -> Result<ParserNumber> { + self.parse_integer(positive) + } + + #[cfg(feature = "arbitrary_precision")] + fn parse_any_number(&mut self, positive: bool) -> Result<ParserNumber> { + let mut buf = String::with_capacity(16); + if !positive { + buf.push('-'); + } + self.scan_integer(&mut buf)?; + if positive { + if let Ok(unsigned) = buf.parse() { + return Ok(ParserNumber::U64(unsigned)); + } + } else { + if let Ok(signed) = buf.parse() { + return Ok(ParserNumber::I64(signed)); + } + } + Ok(ParserNumber::String(buf)) + } + + #[cfg(feature = "arbitrary_precision")] + fn scan_or_eof(&mut self, buf: &mut String) -> Result<u8> { + match tri!(self.next_char()) { + Some(b) => { + buf.push(b as char); + Ok(b) + } + None => Err(self.error(ErrorCode::EofWhileParsingValue)), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn scan_integer(&mut self, buf: &mut String) -> Result<()> { + match tri!(self.scan_or_eof(buf)) { + b'0' => { + // There can be only one leading '0'. + match tri!(self.peek_or_null()) { + b'0'..=b'9' => Err(self.peek_error(ErrorCode::InvalidNumber)), + _ => self.scan_number(buf), + } + } + b'1'..=b'9' => loop { + match tri!(self.peek_or_null()) { + c @ b'0'..=b'9' => { + self.eat_char(); + buf.push(c as char); + } + _ => { + return self.scan_number(buf); + } + } + }, + _ => Err(self.error(ErrorCode::InvalidNumber)), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn scan_number(&mut self, buf: &mut String) -> Result<()> { + match tri!(self.peek_or_null()) { + b'.' => self.scan_decimal(buf), + e @ b'e' | e @ b'E' => self.scan_exponent(e as char, buf), + _ => Ok(()), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn scan_decimal(&mut self, buf: &mut String) -> Result<()> { + self.eat_char(); + buf.push('.'); + + let mut at_least_one_digit = false; + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + buf.push(c as char); + at_least_one_digit = true; + } + + if !at_least_one_digit { + match tri!(self.peek()) { + Some(_) => return Err(self.peek_error(ErrorCode::InvalidNumber)), + None => return Err(self.peek_error(ErrorCode::EofWhileParsingValue)), + } + } + + match tri!(self.peek_or_null()) { + e @ b'e' | e @ b'E' => self.scan_exponent(e as char, buf), + _ => Ok(()), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn scan_exponent(&mut self, e: char, buf: &mut String) -> Result<()> { + self.eat_char(); + buf.push(e); + + match tri!(self.peek_or_null()) { + b'+' => { + self.eat_char(); + buf.push('+'); + } + b'-' => { + self.eat_char(); + buf.push('-'); + } + _ => {} + } + + // Make sure a digit follows the exponent place. + match tri!(self.scan_or_eof(buf)) { + b'0'..=b'9' => {} + _ => { + return Err(self.error(ErrorCode::InvalidNumber)); + } + } + + while let c @ b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + buf.push(c as char); + } + + Ok(()) + } + + fn parse_object_colon(&mut self) -> Result<()> { + match tri!(self.parse_whitespace()) { + Some(b':') => { + self.eat_char(); + Ok(()) + } + Some(_) => Err(self.peek_error(ErrorCode::ExpectedColon)), + None => Err(self.peek_error(ErrorCode::EofWhileParsingObject)), + } + } + + fn end_seq(&mut self) -> Result<()> { + match tri!(self.parse_whitespace()) { + Some(b']') => { + self.eat_char(); + Ok(()) + } + Some(b',') => { + self.eat_char(); + match self.parse_whitespace() { + Ok(Some(b']')) => Err(self.peek_error(ErrorCode::TrailingComma)), + _ => Err(self.peek_error(ErrorCode::TrailingCharacters)), + } + } + Some(_) => Err(self.peek_error(ErrorCode::TrailingCharacters)), + None => Err(self.peek_error(ErrorCode::EofWhileParsingList)), + } + } + + fn end_map(&mut self) -> Result<()> { + match tri!(self.parse_whitespace()) { + Some(b'}') => { + self.eat_char(); + Ok(()) + } + Some(b',') => Err(self.peek_error(ErrorCode::TrailingComma)), + Some(_) => Err(self.peek_error(ErrorCode::TrailingCharacters)), + None => Err(self.peek_error(ErrorCode::EofWhileParsingObject)), + } + } + + fn ignore_value(&mut self) -> Result<()> { + self.scratch.clear(); + let mut enclosing = None; + + loop { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let frame = match peek { + b'n' => { + self.eat_char(); + tri!(self.parse_ident(b"ull")); + None + } + b't' => { + self.eat_char(); + tri!(self.parse_ident(b"rue")); + None + } + b'f' => { + self.eat_char(); + tri!(self.parse_ident(b"alse")); + None + } + b'-' => { + self.eat_char(); + tri!(self.ignore_integer()); + None + } + b'0'..=b'9' => { + tri!(self.ignore_integer()); + None + } + b'"' => { + self.eat_char(); + tri!(self.read.ignore_str()); + None + } + frame @ b'[' | frame @ b'{' => { + self.scratch.extend(enclosing.take()); + self.eat_char(); + Some(frame) + } + _ => return Err(self.peek_error(ErrorCode::ExpectedSomeValue)), + }; + + let (mut accept_comma, mut frame) = match frame { + Some(frame) => (false, frame), + None => match enclosing.take() { + Some(frame) => (true, frame), + None => match self.scratch.pop() { + Some(frame) => (true, frame), + None => return Ok(()), + }, + }, + }; + + loop { + match tri!(self.parse_whitespace()) { + Some(b',') if accept_comma => { + self.eat_char(); + break; + } + Some(b']') if frame == b'[' => {} + Some(b'}') if frame == b'{' => {} + Some(_) => { + if accept_comma { + return Err(self.peek_error(match frame { + b'[' => ErrorCode::ExpectedListCommaOrEnd, + b'{' => ErrorCode::ExpectedObjectCommaOrEnd, + _ => unreachable!(), + })); + } else { + break; + } + } + None => { + return Err(self.peek_error(match frame { + b'[' => ErrorCode::EofWhileParsingList, + b'{' => ErrorCode::EofWhileParsingObject, + _ => unreachable!(), + })); + } + } + + self.eat_char(); + frame = match self.scratch.pop() { + Some(frame) => frame, + None => return Ok(()), + }; + accept_comma = true; + } + + if frame == b'{' { + match tri!(self.parse_whitespace()) { + Some(b'"') => self.eat_char(), + Some(_) => return Err(self.peek_error(ErrorCode::KeyMustBeAString)), + None => return Err(self.peek_error(ErrorCode::EofWhileParsingObject)), + } + tri!(self.read.ignore_str()); + match tri!(self.parse_whitespace()) { + Some(b':') => self.eat_char(), + Some(_) => return Err(self.peek_error(ErrorCode::ExpectedColon)), + None => return Err(self.peek_error(ErrorCode::EofWhileParsingObject)), + } + } + + enclosing = Some(frame); + } + } + + fn ignore_integer(&mut self) -> Result<()> { + match tri!(self.next_char_or_null()) { + b'0' => { + // There can be only one leading '0'. + if let b'0'..=b'9' = tri!(self.peek_or_null()) { + return Err(self.peek_error(ErrorCode::InvalidNumber)); + } + } + b'1'..=b'9' => { + while let b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + } + } + _ => { + return Err(self.error(ErrorCode::InvalidNumber)); + } + } + + match tri!(self.peek_or_null()) { + b'.' => self.ignore_decimal(), + b'e' | b'E' => self.ignore_exponent(), + _ => Ok(()), + } + } + + fn ignore_decimal(&mut self) -> Result<()> { + self.eat_char(); + + let mut at_least_one_digit = false; + while let b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + at_least_one_digit = true; + } + + if !at_least_one_digit { + return Err(self.peek_error(ErrorCode::InvalidNumber)); + } + + match tri!(self.peek_or_null()) { + b'e' | b'E' => self.ignore_exponent(), + _ => Ok(()), + } + } + + fn ignore_exponent(&mut self) -> Result<()> { + self.eat_char(); + + match tri!(self.peek_or_null()) { + b'+' | b'-' => self.eat_char(), + _ => {} + } + + // Make sure a digit follows the exponent place. + match tri!(self.next_char_or_null()) { + b'0'..=b'9' => {} + _ => { + return Err(self.error(ErrorCode::InvalidNumber)); + } + } + + while let b'0'..=b'9' = tri!(self.peek_or_null()) { + self.eat_char(); + } + + Ok(()) + } + + #[cfg(feature = "raw_value")] + fn deserialize_raw_value<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.parse_whitespace()?; + self.read.begin_raw_buffering(); + self.ignore_value()?; + self.read.end_raw_buffering(visitor) + } +} + +impl FromStr for Number { + type Err = Error; + + fn from_str(s: &str) -> result::Result<Self, Self::Err> { + Deserializer::from_str(s) + .parse_any_signed_number() + .map(Into::into) + } +} + +#[cfg(not(feature = "float_roundtrip"))] +static POW10: [f64; 309] = [ + 1e000, 1e001, 1e002, 1e003, 1e004, 1e005, 1e006, 1e007, 1e008, 1e009, // + 1e010, 1e011, 1e012, 1e013, 1e014, 1e015, 1e016, 1e017, 1e018, 1e019, // + 1e020, 1e021, 1e022, 1e023, 1e024, 1e025, 1e026, 1e027, 1e028, 1e029, // + 1e030, 1e031, 1e032, 1e033, 1e034, 1e035, 1e036, 1e037, 1e038, 1e039, // + 1e040, 1e041, 1e042, 1e043, 1e044, 1e045, 1e046, 1e047, 1e048, 1e049, // + 1e050, 1e051, 1e052, 1e053, 1e054, 1e055, 1e056, 1e057, 1e058, 1e059, // + 1e060, 1e061, 1e062, 1e063, 1e064, 1e065, 1e066, 1e067, 1e068, 1e069, // + 1e070, 1e071, 1e072, 1e073, 1e074, 1e075, 1e076, 1e077, 1e078, 1e079, // + 1e080, 1e081, 1e082, 1e083, 1e084, 1e085, 1e086, 1e087, 1e088, 1e089, // + 1e090, 1e091, 1e092, 1e093, 1e094, 1e095, 1e096, 1e097, 1e098, 1e099, // + 1e100, 1e101, 1e102, 1e103, 1e104, 1e105, 1e106, 1e107, 1e108, 1e109, // + 1e110, 1e111, 1e112, 1e113, 1e114, 1e115, 1e116, 1e117, 1e118, 1e119, // + 1e120, 1e121, 1e122, 1e123, 1e124, 1e125, 1e126, 1e127, 1e128, 1e129, // + 1e130, 1e131, 1e132, 1e133, 1e134, 1e135, 1e136, 1e137, 1e138, 1e139, // + 1e140, 1e141, 1e142, 1e143, 1e144, 1e145, 1e146, 1e147, 1e148, 1e149, // + 1e150, 1e151, 1e152, 1e153, 1e154, 1e155, 1e156, 1e157, 1e158, 1e159, // + 1e160, 1e161, 1e162, 1e163, 1e164, 1e165, 1e166, 1e167, 1e168, 1e169, // + 1e170, 1e171, 1e172, 1e173, 1e174, 1e175, 1e176, 1e177, 1e178, 1e179, // + 1e180, 1e181, 1e182, 1e183, 1e184, 1e185, 1e186, 1e187, 1e188, 1e189, // + 1e190, 1e191, 1e192, 1e193, 1e194, 1e195, 1e196, 1e197, 1e198, 1e199, // + 1e200, 1e201, 1e202, 1e203, 1e204, 1e205, 1e206, 1e207, 1e208, 1e209, // + 1e210, 1e211, 1e212, 1e213, 1e214, 1e215, 1e216, 1e217, 1e218, 1e219, // + 1e220, 1e221, 1e222, 1e223, 1e224, 1e225, 1e226, 1e227, 1e228, 1e229, // + 1e230, 1e231, 1e232, 1e233, 1e234, 1e235, 1e236, 1e237, 1e238, 1e239, // + 1e240, 1e241, 1e242, 1e243, 1e244, 1e245, 1e246, 1e247, 1e248, 1e249, // + 1e250, 1e251, 1e252, 1e253, 1e254, 1e255, 1e256, 1e257, 1e258, 1e259, // + 1e260, 1e261, 1e262, 1e263, 1e264, 1e265, 1e266, 1e267, 1e268, 1e269, // + 1e270, 1e271, 1e272, 1e273, 1e274, 1e275, 1e276, 1e277, 1e278, 1e279, // + 1e280, 1e281, 1e282, 1e283, 1e284, 1e285, 1e286, 1e287, 1e288, 1e289, // + 1e290, 1e291, 1e292, 1e293, 1e294, 1e295, 1e296, 1e297, 1e298, 1e299, // + 1e300, 1e301, 1e302, 1e303, 1e304, 1e305, 1e306, 1e307, 1e308, +]; + +macro_rules! deserialize_number { + ($method:ident) => { + fn $method<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_number(visitor) + } + }; +} + +#[cfg(not(feature = "unbounded_depth"))] +macro_rules! if_checking_recursion_limit { + ($($body:tt)*) => { + $($body)* + }; +} + +#[cfg(feature = "unbounded_depth")] +macro_rules! if_checking_recursion_limit { + ($this:ident $($body:tt)*) => { + if !$this.disable_recursion_limit { + $this $($body)* + } + }; +} + +macro_rules! check_recursion { + ($this:ident $($body:tt)*) => { + if_checking_recursion_limit! { + $this.remaining_depth -= 1; + if $this.remaining_depth == 0 { + return Err($this.peek_error(ErrorCode::RecursionLimitExceeded)); + } + } + + $this $($body)* + + if_checking_recursion_limit! { + $this.remaining_depth += 1; + } + }; +} + +impl<'de, 'a, R: Read<'de>> de::Deserializer<'de> for &'a mut Deserializer<R> { + type Error = Error; + + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'n' => { + self.eat_char(); + tri!(self.parse_ident(b"ull")); + visitor.visit_unit() + } + b't' => { + self.eat_char(); + tri!(self.parse_ident(b"rue")); + visitor.visit_bool(true) + } + b'f' => { + self.eat_char(); + tri!(self.parse_ident(b"alse")); + visitor.visit_bool(false) + } + b'-' => { + self.eat_char(); + tri!(self.parse_any_number(false)).visit(visitor) + } + b'0'..=b'9' => tri!(self.parse_any_number(true)).visit(visitor), + b'"' => { + self.eat_char(); + self.scratch.clear(); + match tri!(self.read.parse_str(&mut self.scratch)) { + Reference::Borrowed(s) => visitor.visit_borrowed_str(s), + Reference::Copied(s) => visitor.visit_str(s), + } + } + b'[' => { + check_recursion! { + self.eat_char(); + let ret = visitor.visit_seq(SeqAccess::new(self)); + } + + match (ret, self.end_seq()) { + (Ok(ret), Ok(())) => Ok(ret), + (Err(err), _) | (_, Err(err)) => Err(err), + } + } + b'{' => { + check_recursion! { + self.eat_char(); + let ret = visitor.visit_map(MapAccess::new(self)); + } + + match (ret, self.end_map()) { + (Ok(ret), Ok(())) => Ok(ret), + (Err(err), _) | (_, Err(err)) => Err(err), + } + } + _ => Err(self.peek_error(ErrorCode::ExpectedSomeValue)), + }; + + match value { + Ok(value) => Ok(value), + // The de::Error impl creates errors with unknown line and column. + // Fill in the position here by looking at the current index in the + // input. There is no way to tell whether this should call `error` + // or `peek_error` so pick the one that seems correct more often. + // Worst case, the position is off by one character. + Err(err) => Err(self.fix_position(err)), + } + } + + fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b't' => { + self.eat_char(); + tri!(self.parse_ident(b"rue")); + visitor.visit_bool(true) + } + b'f' => { + self.eat_char(); + tri!(self.parse_ident(b"alse")); + visitor.visit_bool(false) + } + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + deserialize_number!(deserialize_i8); + deserialize_number!(deserialize_i16); + deserialize_number!(deserialize_i32); + deserialize_number!(deserialize_i64); + deserialize_number!(deserialize_u8); + deserialize_number!(deserialize_u16); + deserialize_number!(deserialize_u32); + deserialize_number!(deserialize_u64); + #[cfg(not(feature = "float_roundtrip"))] + deserialize_number!(deserialize_f32); + deserialize_number!(deserialize_f64); + + #[cfg(feature = "float_roundtrip")] + fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.single_precision = true; + let val = self.deserialize_number(visitor); + self.single_precision = false; + val + } + + serde_if_integer128! { + fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let mut buf = String::new(); + + match tri!(self.parse_whitespace()) { + Some(b'-') => { + self.eat_char(); + buf.push('-'); + } + Some(_) => {} + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + tri!(self.scan_integer128(&mut buf)); + + let value = match buf.parse() { + Ok(int) => visitor.visit_i128(int), + Err(_) => { + return Err(self.error(ErrorCode::NumberOutOfRange)); + } + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + match tri!(self.parse_whitespace()) { + Some(b'-') => { + return Err(self.peek_error(ErrorCode::NumberOutOfRange)); + } + Some(_) => {} + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + } + + let mut buf = String::new(); + tri!(self.scan_integer128(&mut buf)); + + let value = match buf.parse() { + Ok(int) => visitor.visit_u128(int), + Err(_) => { + return Err(self.error(ErrorCode::NumberOutOfRange)); + } + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + } + + fn deserialize_char<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_str(visitor) + } + + fn deserialize_str<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'"' => { + self.eat_char(); + self.scratch.clear(); + match tri!(self.read.parse_str(&mut self.scratch)) { + Reference::Borrowed(s) => visitor.visit_borrowed_str(s), + Reference::Copied(s) => visitor.visit_str(s), + } + } + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + fn deserialize_string<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_str(visitor) + } + + /// Parses a JSON string as bytes. Note that this function does not check + /// whether the bytes represent a valid UTF-8 string. + /// + /// The relevant part of the JSON specification is Section 8.2 of [RFC + /// 7159]: + /// + /// > When all the strings represented in a JSON text are composed entirely + /// > of Unicode characters (however escaped), then that JSON text is + /// > interoperable in the sense that all software implementations that + /// > parse it will agree on the contents of names and of string values in + /// > objects and arrays. + /// > + /// > However, the ABNF in this specification allows member names and string + /// > values to contain bit sequences that cannot encode Unicode characters; + /// > for example, "\uDEAD" (a single unpaired UTF-16 surrogate). Instances + /// > of this have been observed, for example, when a library truncates a + /// > UTF-16 string without checking whether the truncation split a + /// > surrogate pair. The behavior of software that receives JSON texts + /// > containing such values is unpredictable; for example, implementations + /// > might return different values for the length of a string value or even + /// > suffer fatal runtime exceptions. + /// + /// [RFC 7159]: https://tools.ietf.org/html/rfc7159 + /// + /// The behavior of serde_json is specified to fail on non-UTF-8 strings + /// when deserializing into Rust UTF-8 string types such as String, and + /// succeed with non-UTF-8 bytes when deserializing using this method. + /// + /// Escape sequences are processed as usual, and for `\uXXXX` escapes it is + /// still checked if the hex number represents a valid Unicode code point. + /// + /// # Examples + /// + /// You can use this to parse JSON strings containing invalid UTF-8 bytes, + /// or unpaired surrogates. + /// + /// ``` + /// use serde_bytes::ByteBuf; + /// + /// fn look_at_bytes() -> Result<(), serde_json::Error> { + /// let json_data = b"\"some bytes: \xe5\x00\xe5\""; + /// let bytes: ByteBuf = serde_json::from_slice(json_data)?; + /// + /// assert_eq!(b'\xe5', bytes[12]); + /// assert_eq!(b'\0', bytes[13]); + /// assert_eq!(b'\xe5', bytes[14]); + /// + /// Ok(()) + /// } + /// # + /// # look_at_bytes().unwrap(); + /// ``` + /// + /// Backslash escape sequences like `\n` are still interpreted and required + /// to be valid. `\u` escape sequences are required to represent a valid + /// Unicode code point or lone surrogate. + /// + /// ``` + /// use serde_bytes::ByteBuf; + /// + /// fn look_at_bytes() -> Result<(), serde_json::Error> { + /// let json_data = b"\"lone surrogate: \\uD801\""; + /// let bytes: ByteBuf = serde_json::from_slice(json_data)?; + /// let expected = b"lone surrogate: \xED\xA0\x81"; + /// assert_eq!(expected, bytes.as_slice()); + /// Ok(()) + /// } + /// # + /// # look_at_bytes(); + /// ``` + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'"' => { + self.eat_char(); + self.scratch.clear(); + match tri!(self.read.parse_str_raw(&mut self.scratch)) { + Reference::Borrowed(b) => visitor.visit_borrowed_bytes(b), + Reference::Copied(b) => visitor.visit_bytes(b), + } + } + b'[' => self.deserialize_seq(visitor), + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + #[inline] + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_bytes(visitor) + } + + /// Parses a `null` as a None, and any other values as a `Some(...)`. + #[inline] + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + match tri!(self.parse_whitespace()) { + Some(b'n') => { + self.eat_char(); + tri!(self.parse_ident(b"ull")); + visitor.visit_none() + } + _ => visitor.visit_some(self), + } + } + + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'n' => { + self.eat_char(); + tri!(self.parse_ident(b"ull")); + visitor.visit_unit() + } + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + fn deserialize_unit_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_unit(visitor) + } + + /// Parses a newtype struct as the underlying value. + #[inline] + fn deserialize_newtype_struct<V>(self, name: &str, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + #[cfg(feature = "raw_value")] + { + if name == crate::raw::TOKEN { + return self.deserialize_raw_value(visitor); + } + } + + let _ = name; + visitor.visit_newtype_struct(self) + } + + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'[' => { + check_recursion! { + self.eat_char(); + let ret = visitor.visit_seq(SeqAccess::new(self)); + } + + match (ret, self.end_seq()) { + (Ok(ret), Ok(())) => Ok(ret), + (Err(err), _) | (_, Err(err)) => Err(err), + } + } + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_tuple_struct<V>( + self, + _name: &'static str, + _len: usize, + visitor: V, + ) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'{' => { + check_recursion! { + self.eat_char(); + let ret = visitor.visit_map(MapAccess::new(self)); + } + + match (ret, self.end_map()) { + (Ok(ret), Ok(())) => Ok(ret), + (Err(err), _) | (_, Err(err)) => Err(err), + } + } + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + fn deserialize_struct<V>( + self, + _name: &'static str, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + let peek = match tri!(self.parse_whitespace()) { + Some(b) => b, + None => { + return Err(self.peek_error(ErrorCode::EofWhileParsingValue)); + } + }; + + let value = match peek { + b'[' => { + check_recursion! { + self.eat_char(); + let ret = visitor.visit_seq(SeqAccess::new(self)); + } + + match (ret, self.end_seq()) { + (Ok(ret), Ok(())) => Ok(ret), + (Err(err), _) | (_, Err(err)) => Err(err), + } + } + b'{' => { + check_recursion! { + self.eat_char(); + let ret = visitor.visit_map(MapAccess::new(self)); + } + + match (ret, self.end_map()) { + (Ok(ret), Ok(())) => Ok(ret), + (Err(err), _) | (_, Err(err)) => Err(err), + } + } + _ => Err(self.peek_invalid_type(&visitor)), + }; + + match value { + Ok(value) => Ok(value), + Err(err) => Err(self.fix_position(err)), + } + } + + /// Parses an enum as an object like `{"$KEY":$VALUE}`, where $VALUE is either a straight + /// value, a `[..]`, or a `{..}`. + #[inline] + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + match tri!(self.parse_whitespace()) { + Some(b'{') => { + check_recursion! { + self.eat_char(); + let value = tri!(visitor.visit_enum(VariantAccess::new(self))); + } + + match tri!(self.parse_whitespace()) { + Some(b'}') => { + self.eat_char(); + Ok(value) + } + Some(_) => Err(self.error(ErrorCode::ExpectedSomeValue)), + None => Err(self.error(ErrorCode::EofWhileParsingObject)), + } + } + Some(b'"') => visitor.visit_enum(UnitVariantAccess::new(self)), + Some(_) => Err(self.peek_error(ErrorCode::ExpectedSomeValue)), + None => Err(self.peek_error(ErrorCode::EofWhileParsingValue)), + } + } + + fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.deserialize_str(visitor) + } + + fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + tri!(self.ignore_value()); + visitor.visit_unit() + } +} + +struct SeqAccess<'a, R: 'a> { + de: &'a mut Deserializer<R>, + first: bool, +} + +impl<'a, R: 'a> SeqAccess<'a, R> { + fn new(de: &'a mut Deserializer<R>) -> Self { + SeqAccess { de, first: true } + } +} + +impl<'de, 'a, R: Read<'de> + 'a> de::SeqAccess<'de> for SeqAccess<'a, R> { + type Error = Error; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>> + where + T: de::DeserializeSeed<'de>, + { + let peek = match tri!(self.de.parse_whitespace()) { + Some(b']') => { + return Ok(None); + } + Some(b',') if !self.first => { + self.de.eat_char(); + tri!(self.de.parse_whitespace()) + } + Some(b) => { + if self.first { + self.first = false; + Some(b) + } else { + return Err(self.de.peek_error(ErrorCode::ExpectedListCommaOrEnd)); + } + } + None => { + return Err(self.de.peek_error(ErrorCode::EofWhileParsingList)); + } + }; + + match peek { + Some(b']') => Err(self.de.peek_error(ErrorCode::TrailingComma)), + Some(_) => Ok(Some(tri!(seed.deserialize(&mut *self.de)))), + None => Err(self.de.peek_error(ErrorCode::EofWhileParsingValue)), + } + } +} + +struct MapAccess<'a, R: 'a> { + de: &'a mut Deserializer<R>, + first: bool, +} + +impl<'a, R: 'a> MapAccess<'a, R> { + fn new(de: &'a mut Deserializer<R>) -> Self { + MapAccess { de, first: true } + } +} + +impl<'de, 'a, R: Read<'de> + 'a> de::MapAccess<'de> for MapAccess<'a, R> { + type Error = Error; + + fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>> + where + K: de::DeserializeSeed<'de>, + { + let peek = match tri!(self.de.parse_whitespace()) { + Some(b'}') => { + return Ok(None); + } + Some(b',') if !self.first => { + self.de.eat_char(); + tri!(self.de.parse_whitespace()) + } + Some(b) => { + if self.first { + self.first = false; + Some(b) + } else { + return Err(self.de.peek_error(ErrorCode::ExpectedObjectCommaOrEnd)); + } + } + None => { + return Err(self.de.peek_error(ErrorCode::EofWhileParsingObject)); + } + }; + + match peek { + Some(b'"') => seed.deserialize(MapKey { de: &mut *self.de }).map(Some), + Some(b'}') => Err(self.de.peek_error(ErrorCode::TrailingComma)), + Some(_) => Err(self.de.peek_error(ErrorCode::KeyMustBeAString)), + None => Err(self.de.peek_error(ErrorCode::EofWhileParsingValue)), + } + } + + fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value> + where + V: de::DeserializeSeed<'de>, + { + tri!(self.de.parse_object_colon()); + + seed.deserialize(&mut *self.de) + } +} + +struct VariantAccess<'a, R: 'a> { + de: &'a mut Deserializer<R>, +} + +impl<'a, R: 'a> VariantAccess<'a, R> { + fn new(de: &'a mut Deserializer<R>) -> Self { + VariantAccess { de } + } +} + +impl<'de, 'a, R: Read<'de> + 'a> de::EnumAccess<'de> for VariantAccess<'a, R> { + type Error = Error; + type Variant = Self; + + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self)> + where + V: de::DeserializeSeed<'de>, + { + let val = tri!(seed.deserialize(&mut *self.de)); + tri!(self.de.parse_object_colon()); + Ok((val, self)) + } +} + +impl<'de, 'a, R: Read<'de> + 'a> de::VariantAccess<'de> for VariantAccess<'a, R> { + type Error = Error; + + fn unit_variant(self) -> Result<()> { + de::Deserialize::deserialize(self.de) + } + + fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value> + where + T: de::DeserializeSeed<'de>, + { + seed.deserialize(self.de) + } + + fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + de::Deserializer::deserialize_seq(self.de, visitor) + } + + fn struct_variant<V>(self, fields: &'static [&'static str], visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + de::Deserializer::deserialize_struct(self.de, "", fields, visitor) + } +} + +struct UnitVariantAccess<'a, R: 'a> { + de: &'a mut Deserializer<R>, +} + +impl<'a, R: 'a> UnitVariantAccess<'a, R> { + fn new(de: &'a mut Deserializer<R>) -> Self { + UnitVariantAccess { de } + } +} + +impl<'de, 'a, R: Read<'de> + 'a> de::EnumAccess<'de> for UnitVariantAccess<'a, R> { + type Error = Error; + type Variant = Self; + + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self)> + where + V: de::DeserializeSeed<'de>, + { + let variant = tri!(seed.deserialize(&mut *self.de)); + Ok((variant, self)) + } +} + +impl<'de, 'a, R: Read<'de> + 'a> de::VariantAccess<'de> for UnitVariantAccess<'a, R> { + type Error = Error; + + fn unit_variant(self) -> Result<()> { + Ok(()) + } + + fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value> + where + T: de::DeserializeSeed<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"newtype variant", + )) + } + + fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"tuple variant", + )) + } + + fn struct_variant<V>(self, _fields: &'static [&'static str], _visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"struct variant", + )) + } +} + +/// Only deserialize from this after peeking a '"' byte! Otherwise it may +/// deserialize invalid JSON successfully. +struct MapKey<'a, R: 'a> { + de: &'a mut Deserializer<R>, +} + +macro_rules! deserialize_integer_key { + ($method:ident => $visit:ident) => { + fn $method<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.de.eat_char(); + self.de.scratch.clear(); + let string = tri!(self.de.read.parse_str(&mut self.de.scratch)); + match (string.parse(), string) { + (Ok(integer), _) => visitor.$visit(integer), + (Err(_), Reference::Borrowed(s)) => visitor.visit_borrowed_str(s), + (Err(_), Reference::Copied(s)) => visitor.visit_str(s), + } + } + }; +} + +impl<'de, 'a, R> de::Deserializer<'de> for MapKey<'a, R> +where + R: Read<'de>, +{ + type Error = Error; + + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.de.eat_char(); + self.de.scratch.clear(); + match tri!(self.de.read.parse_str(&mut self.de.scratch)) { + Reference::Borrowed(s) => visitor.visit_borrowed_str(s), + Reference::Copied(s) => visitor.visit_str(s), + } + } + + deserialize_integer_key!(deserialize_i8 => visit_i8); + deserialize_integer_key!(deserialize_i16 => visit_i16); + deserialize_integer_key!(deserialize_i32 => visit_i32); + deserialize_integer_key!(deserialize_i64 => visit_i64); + deserialize_integer_key!(deserialize_u8 => visit_u8); + deserialize_integer_key!(deserialize_u16 => visit_u16); + deserialize_integer_key!(deserialize_u32 => visit_u32); + deserialize_integer_key!(deserialize_u64 => visit_u64); + + serde_if_integer128! { + deserialize_integer_key!(deserialize_i128 => visit_i128); + deserialize_integer_key!(deserialize_u128 => visit_u128); + } + + #[inline] + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + // Map keys cannot be null. + visitor.visit_some(self) + } + + #[inline] + fn deserialize_newtype_struct<V>(self, name: &'static str, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + #[cfg(feature = "raw_value")] + { + if name == crate::raw::TOKEN { + return self.de.deserialize_raw_value(visitor); + } + } + + let _ = name; + visitor.visit_newtype_struct(self) + } + + #[inline] + fn deserialize_enum<V>( + self, + name: &'static str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.de.deserialize_enum(name, variants, visitor) + } + + #[inline] + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.de.deserialize_bytes(visitor) + } + + #[inline] + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value> + where + V: de::Visitor<'de>, + { + self.de.deserialize_bytes(visitor) + } + + forward_to_deserialize_any! { + bool f32 f64 char str string unit unit_struct seq tuple tuple_struct map + struct identifier ignored_any + } +} + +////////////////////////////////////////////////////////////////////////////// + +/// Iterator that deserializes a stream into multiple JSON values. +/// +/// A stream deserializer can be created from any JSON deserializer using the +/// `Deserializer::into_iter` method. +/// +/// The data can consist of any JSON value. Values need to be a self-delineating value e.g. +/// arrays, objects, or strings, or be followed by whitespace or a self-delineating value. +/// +/// ``` +/// use serde_json::{Deserializer, Value}; +/// +/// fn main() { +/// let data = "{\"k\": 3}1\"cool\"\"stuff\" 3{} [0, 1, 2]"; +/// +/// let stream = Deserializer::from_str(data).into_iter::<Value>(); +/// +/// for value in stream { +/// println!("{}", value.unwrap()); +/// } +/// } +/// ``` +pub struct StreamDeserializer<'de, R, T> { + de: Deserializer<R>, + offset: usize, + failed: bool, + output: PhantomData<T>, + lifetime: PhantomData<&'de ()>, +} + +impl<'de, R, T> StreamDeserializer<'de, R, T> +where + R: read::Read<'de>, + T: de::Deserialize<'de>, +{ + /// Create a JSON stream deserializer from one of the possible serde_json + /// input sources. + /// + /// Typically it is more convenient to use one of these methods instead: + /// + /// - Deserializer::from_str(...).into_iter() + /// - Deserializer::from_slice(...).into_iter() + /// - Deserializer::from_reader(...).into_iter() + pub fn new(read: R) -> Self { + let offset = read.byte_offset(); + StreamDeserializer { + de: Deserializer::new(read), + offset, + failed: false, + output: PhantomData, + lifetime: PhantomData, + } + } + + /// Returns the number of bytes so far deserialized into a successful `T`. + /// + /// If a stream deserializer returns an EOF error, new data can be joined to + /// `old_data[stream.byte_offset()..]` to try again. + /// + /// ``` + /// let data = b"[0] [1] ["; + /// + /// let de = serde_json::Deserializer::from_slice(data); + /// let mut stream = de.into_iter::<Vec<i32>>(); + /// assert_eq!(0, stream.byte_offset()); + /// + /// println!("{:?}", stream.next()); // [0] + /// assert_eq!(3, stream.byte_offset()); + /// + /// println!("{:?}", stream.next()); // [1] + /// assert_eq!(7, stream.byte_offset()); + /// + /// println!("{:?}", stream.next()); // error + /// assert_eq!(8, stream.byte_offset()); + /// + /// // If err.is_eof(), can join the remaining data to new data and continue. + /// let remaining = &data[stream.byte_offset()..]; + /// ``` + /// + /// *Note:* In the future this method may be changed to return the number of + /// bytes so far deserialized into a successful T *or* syntactically valid + /// JSON skipped over due to a type error. See [serde-rs/json#70] for an + /// example illustrating this. + /// + /// [serde-rs/json#70]: https://github.com/serde-rs/json/issues/70 + pub fn byte_offset(&self) -> usize { + self.offset + } + + fn peek_end_of_value(&mut self) -> Result<()> { + match tri!(self.de.peek()) { + Some(b' ') | Some(b'\n') | Some(b'\t') | Some(b'\r') | Some(b'"') | Some(b'[') + | Some(b']') | Some(b'{') | Some(b'}') | Some(b',') | Some(b':') | None => Ok(()), + Some(_) => { + let position = self.de.read.peek_position(); + Err(Error::syntax( + ErrorCode::TrailingCharacters, + position.line, + position.column, + )) + } + } + } +} + +impl<'de, R, T> Iterator for StreamDeserializer<'de, R, T> +where + R: Read<'de>, + T: de::Deserialize<'de>, +{ + type Item = Result<T>; + + fn next(&mut self) -> Option<Result<T>> { + if R::should_early_return_if_failed && self.failed { + return None; + } + + // skip whitespaces, if any + // this helps with trailing whitespaces, since whitespaces between + // values are handled for us. + match self.de.parse_whitespace() { + Ok(None) => { + self.offset = self.de.read.byte_offset(); + None + } + Ok(Some(b)) => { + // If the value does not have a clear way to show the end of the value + // (like numbers, null, true etc.) we have to look for whitespace or + // the beginning of a self-delineated value. + let self_delineated_value = match b { + b'[' | b'"' | b'{' => true, + _ => false, + }; + self.offset = self.de.read.byte_offset(); + let result = de::Deserialize::deserialize(&mut self.de); + + Some(match result { + Ok(value) => { + self.offset = self.de.read.byte_offset(); + if self_delineated_value { + Ok(value) + } else { + self.peek_end_of_value().map(|_| value) + } + } + Err(e) => { + self.de.read.set_failed(&mut self.failed); + Err(e) + } + }) + } + Err(e) => { + self.de.read.set_failed(&mut self.failed); + Some(Err(e)) + } + } + } +} + +impl<'de, R, T> FusedIterator for StreamDeserializer<'de, R, T> +where + R: Read<'de> + Fused, + T: de::Deserialize<'de>, +{ +} + +////////////////////////////////////////////////////////////////////////////// + +fn from_trait<'de, R, T>(read: R) -> Result<T> +where + R: Read<'de>, + T: de::Deserialize<'de>, +{ + let mut de = Deserializer::new(read); + let value = tri!(de::Deserialize::deserialize(&mut de)); + + // Make sure the whole stream has been consumed. + tri!(de.end()); + Ok(value) +} + +/// Deserialize an instance of type `T` from an IO stream of JSON. +/// +/// The content of the IO stream is deserialized directly from the stream +/// without being buffered in memory by serde_json. +/// +/// When reading from a source against which short reads are not efficient, such +/// as a [`File`], you will want to apply your own buffering because serde_json +/// will not buffer the input. See [`std::io::BufReader`]. +/// +/// It is expected that the input stream ends after the deserialized object. +/// If the stream does not end, such as in the case of a persistent socket connection, +/// this function will not return. It is possible instead to deserialize from a prefix of an input +/// stream without looking for EOF by managing your own [`Deserializer`]. +/// +/// Note that counter to intuition, this function is usually slower than +/// reading a file completely into memory and then applying [`from_str`] +/// or [`from_slice`] on it. See [issue #160]. +/// +/// [`File`]: https://doc.rust-lang.org/std/fs/struct.File.html +/// [`std::io::BufReader`]: https://doc.rust-lang.org/std/io/struct.BufReader.html +/// [`from_str`]: ./fn.from_str.html +/// [`from_slice`]: ./fn.from_slice.html +/// [issue #160]: https://github.com/serde-rs/json/issues/160 +/// +/// # Example +/// +/// Reading the contents of a file. +/// +/// ``` +/// use serde::Deserialize; +/// +/// use std::error::Error; +/// use std::fs::File; +/// use std::io::BufReader; +/// use std::path::Path; +/// +/// #[derive(Deserialize, Debug)] +/// struct User { +/// fingerprint: String, +/// location: String, +/// } +/// +/// fn read_user_from_file<P: AsRef<Path>>(path: P) -> Result<User, Box<dyn Error>> { +/// // Open the file in read-only mode with buffer. +/// let file = File::open(path)?; +/// let reader = BufReader::new(file); +/// +/// // Read the JSON contents of the file as an instance of `User`. +/// let u = serde_json::from_reader(reader)?; +/// +/// // Return the `User`. +/// Ok(u) +/// } +/// +/// fn main() { +/// # } +/// # fn fake_main() { +/// let u = read_user_from_file("test.json").unwrap(); +/// println!("{:#?}", u); +/// } +/// ``` +/// +/// Reading from a persistent socket connection. +/// +/// ``` +/// use serde::Deserialize; +/// +/// use std::error::Error; +/// use std::net::{TcpListener, TcpStream}; +/// +/// #[derive(Deserialize, Debug)] +/// struct User { +/// fingerprint: String, +/// location: String, +/// } +/// +/// fn read_user_from_stream(tcp_stream: TcpStream) -> Result<User, Box<dyn Error>> { +/// let mut de = serde_json::Deserializer::from_reader(tcp_stream); +/// let u = User::deserialize(&mut de)?; +/// +/// Ok(u) +/// } +/// +/// fn main() { +/// # } +/// # fn fake_main() { +/// let listener = TcpListener::bind("127.0.0.1:4000").unwrap(); +/// +/// for stream in listener.incoming() { +/// println!("{:#?}", read_user_from_stream(stream.unwrap())); +/// } +/// } +/// ``` +/// +/// # Errors +/// +/// This conversion can fail if the structure of the input does not match the +/// structure expected by `T`, for example if `T` is a struct type but the input +/// contains something other than a JSON map. It can also fail if the structure +/// is correct but `T`'s implementation of `Deserialize` decides that something +/// is wrong with the data, for example required struct fields are missing from +/// the JSON map or some number is too big to fit in the expected primitive +/// type. +#[cfg(feature = "std")] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub fn from_reader<R, T>(rdr: R) -> Result<T> +where + R: crate::io::Read, + T: de::DeserializeOwned, +{ + from_trait(read::IoRead::new(rdr)) +} + +/// Deserialize an instance of type `T` from bytes of JSON text. +/// +/// # Example +/// +/// ``` +/// use serde::Deserialize; +/// +/// #[derive(Deserialize, Debug)] +/// struct User { +/// fingerprint: String, +/// location: String, +/// } +/// +/// fn main() { +/// // The type of `j` is `&[u8]` +/// let j = b" +/// { +/// \"fingerprint\": \"0xF9BA143B95FF6D82\", +/// \"location\": \"Menlo Park, CA\" +/// }"; +/// +/// let u: User = serde_json::from_slice(j).unwrap(); +/// println!("{:#?}", u); +/// } +/// ``` +/// +/// # Errors +/// +/// This conversion can fail if the structure of the input does not match the +/// structure expected by `T`, for example if `T` is a struct type but the input +/// contains something other than a JSON map. It can also fail if the structure +/// is correct but `T`'s implementation of `Deserialize` decides that something +/// is wrong with the data, for example required struct fields are missing from +/// the JSON map or some number is too big to fit in the expected primitive +/// type. +pub fn from_slice<'a, T>(v: &'a [u8]) -> Result<T> +where + T: de::Deserialize<'a>, +{ + from_trait(read::SliceRead::new(v)) +} + +/// Deserialize an instance of type `T` from a string of JSON text. +/// +/// # Example +/// +/// ``` +/// use serde::Deserialize; +/// +/// #[derive(Deserialize, Debug)] +/// struct User { +/// fingerprint: String, +/// location: String, +/// } +/// +/// fn main() { +/// // The type of `j` is `&str` +/// let j = " +/// { +/// \"fingerprint\": \"0xF9BA143B95FF6D82\", +/// \"location\": \"Menlo Park, CA\" +/// }"; +/// +/// let u: User = serde_json::from_str(j).unwrap(); +/// println!("{:#?}", u); +/// } +/// ``` +/// +/// # Errors +/// +/// This conversion can fail if the structure of the input does not match the +/// structure expected by `T`, for example if `T` is a struct type but the input +/// contains something other than a JSON map. It can also fail if the structure +/// is correct but `T`'s implementation of `Deserialize` decides that something +/// is wrong with the data, for example required struct fields are missing from +/// the JSON map or some number is too big to fit in the expected primitive +/// type. +pub fn from_str<'a, T>(s: &'a str) -> Result<T> +where + T: de::Deserialize<'a>, +{ + from_trait(read::StrRead::new(s)) +} diff --git a/vendor/serde_json/src/error.rs b/vendor/serde_json/src/error.rs new file mode 100644 index 000000000..1875ef08b --- /dev/null +++ b/vendor/serde_json/src/error.rs @@ -0,0 +1,445 @@ +//! When serializing or deserializing JSON goes wrong. + +use crate::io; +use alloc::boxed::Box; +use alloc::string::{String, ToString}; +use core::fmt::{self, Debug, Display}; +use core::result; +use core::str::FromStr; +use serde::{de, ser}; +#[cfg(feature = "std")] +use std::error; + +/// This type represents all possible errors that can occur when serializing or +/// deserializing JSON data. +pub struct Error { + /// This `Box` allows us to keep the size of `Error` as small as possible. A + /// larger `Error` type was substantially slower due to all the functions + /// that pass around `Result<T, Error>`. + err: Box<ErrorImpl>, +} + +/// Alias for a `Result` with the error type `serde_json::Error`. +pub type Result<T> = result::Result<T, Error>; + +impl Error { + /// One-based line number at which the error was detected. + /// + /// Characters in the first line of the input (before the first newline + /// character) are in line 1. + pub fn line(&self) -> usize { + self.err.line + } + + /// One-based column number at which the error was detected. + /// + /// The first character in the input and any characters immediately + /// following a newline character are in column 1. + /// + /// Note that errors may occur in column 0, for example if a read from an IO + /// stream fails immediately following a previously read newline character. + pub fn column(&self) -> usize { + self.err.column + } + + /// Categorizes the cause of this error. + /// + /// - `Category::Io` - failure to read or write bytes on an IO stream + /// - `Category::Syntax` - input that is not syntactically valid JSON + /// - `Category::Data` - input data that is semantically incorrect + /// - `Category::Eof` - unexpected end of the input data + pub fn classify(&self) -> Category { + match self.err.code { + ErrorCode::Message(_) => Category::Data, + ErrorCode::Io(_) => Category::Io, + ErrorCode::EofWhileParsingList + | ErrorCode::EofWhileParsingObject + | ErrorCode::EofWhileParsingString + | ErrorCode::EofWhileParsingValue => Category::Eof, + ErrorCode::ExpectedColon + | ErrorCode::ExpectedListCommaOrEnd + | ErrorCode::ExpectedObjectCommaOrEnd + | ErrorCode::ExpectedSomeIdent + | ErrorCode::ExpectedSomeValue + | ErrorCode::InvalidEscape + | ErrorCode::InvalidNumber + | ErrorCode::NumberOutOfRange + | ErrorCode::InvalidUnicodeCodePoint + | ErrorCode::ControlCharacterWhileParsingString + | ErrorCode::KeyMustBeAString + | ErrorCode::LoneLeadingSurrogateInHexEscape + | ErrorCode::TrailingComma + | ErrorCode::TrailingCharacters + | ErrorCode::UnexpectedEndOfHexEscape + | ErrorCode::RecursionLimitExceeded => Category::Syntax, + } + } + + /// Returns true if this error was caused by a failure to read or write + /// bytes on an IO stream. + pub fn is_io(&self) -> bool { + self.classify() == Category::Io + } + + /// Returns true if this error was caused by input that was not + /// syntactically valid JSON. + pub fn is_syntax(&self) -> bool { + self.classify() == Category::Syntax + } + + /// Returns true if this error was caused by input data that was + /// semantically incorrect. + /// + /// For example, JSON containing a number is semantically incorrect when the + /// type being deserialized into holds a String. + pub fn is_data(&self) -> bool { + self.classify() == Category::Data + } + + /// Returns true if this error was caused by prematurely reaching the end of + /// the input data. + /// + /// Callers that process streaming input may be interested in retrying the + /// deserialization once more data is available. + pub fn is_eof(&self) -> bool { + self.classify() == Category::Eof + } +} + +/// Categorizes the cause of a `serde_json::Error`. +#[derive(Copy, Clone, PartialEq, Eq, Debug)] +pub enum Category { + /// The error was caused by a failure to read or write bytes on an IO + /// stream. + Io, + + /// The error was caused by input that was not syntactically valid JSON. + Syntax, + + /// The error was caused by input data that was semantically incorrect. + /// + /// For example, JSON containing a number is semantically incorrect when the + /// type being deserialized into holds a String. + Data, + + /// The error was caused by prematurely reaching the end of the input data. + /// + /// Callers that process streaming input may be interested in retrying the + /// deserialization once more data is available. + Eof, +} + +#[cfg(feature = "std")] +#[allow(clippy::fallible_impl_from)] +impl From<Error> for io::Error { + /// Convert a `serde_json::Error` into an `io::Error`. + /// + /// JSON syntax and data errors are turned into `InvalidData` IO errors. + /// EOF errors are turned into `UnexpectedEof` IO errors. + /// + /// ``` + /// use std::io; + /// + /// enum MyError { + /// Io(io::Error), + /// Json(serde_json::Error), + /// } + /// + /// impl From<serde_json::Error> for MyError { + /// fn from(err: serde_json::Error) -> MyError { + /// use serde_json::error::Category; + /// match err.classify() { + /// Category::Io => { + /// MyError::Io(err.into()) + /// } + /// Category::Syntax | Category::Data | Category::Eof => { + /// MyError::Json(err) + /// } + /// } + /// } + /// } + /// ``` + fn from(j: Error) -> Self { + if let ErrorCode::Io(err) = j.err.code { + err + } else { + match j.classify() { + Category::Io => unreachable!(), + Category::Syntax | Category::Data => io::Error::new(io::ErrorKind::InvalidData, j), + Category::Eof => io::Error::new(io::ErrorKind::UnexpectedEof, j), + } + } + } +} + +struct ErrorImpl { + code: ErrorCode, + line: usize, + column: usize, +} + +pub(crate) enum ErrorCode { + /// Catchall for syntax error messages + Message(Box<str>), + + /// Some IO error occurred while serializing or deserializing. + Io(io::Error), + + /// EOF while parsing a list. + EofWhileParsingList, + + /// EOF while parsing an object. + EofWhileParsingObject, + + /// EOF while parsing a string. + EofWhileParsingString, + + /// EOF while parsing a JSON value. + EofWhileParsingValue, + + /// Expected this character to be a `':'`. + ExpectedColon, + + /// Expected this character to be either a `','` or a `']'`. + ExpectedListCommaOrEnd, + + /// Expected this character to be either a `','` or a `'}'`. + ExpectedObjectCommaOrEnd, + + /// Expected to parse either a `true`, `false`, or a `null`. + ExpectedSomeIdent, + + /// Expected this character to start a JSON value. + ExpectedSomeValue, + + /// Invalid hex escape code. + InvalidEscape, + + /// Invalid number. + InvalidNumber, + + /// Number is bigger than the maximum value of its type. + NumberOutOfRange, + + /// Invalid unicode code point. + InvalidUnicodeCodePoint, + + /// Control character found while parsing a string. + ControlCharacterWhileParsingString, + + /// Object key is not a string. + KeyMustBeAString, + + /// Lone leading surrogate in hex escape. + LoneLeadingSurrogateInHexEscape, + + /// JSON has a comma after the last value in an array or map. + TrailingComma, + + /// JSON has non-whitespace trailing characters after the value. + TrailingCharacters, + + /// Unexpected end of hex escape. + UnexpectedEndOfHexEscape, + + /// Encountered nesting of JSON maps and arrays more than 128 layers deep. + RecursionLimitExceeded, +} + +impl Error { + #[cold] + pub(crate) fn syntax(code: ErrorCode, line: usize, column: usize) -> Self { + Error { + err: Box::new(ErrorImpl { code, line, column }), + } + } + + // Not public API. Should be pub(crate). + // + // Update `eager_json` crate when this function changes. + #[doc(hidden)] + #[cold] + pub fn io(error: io::Error) -> Self { + Error { + err: Box::new(ErrorImpl { + code: ErrorCode::Io(error), + line: 0, + column: 0, + }), + } + } + + #[cold] + pub(crate) fn fix_position<F>(self, f: F) -> Self + where + F: FnOnce(ErrorCode) -> Error, + { + if self.err.line == 0 { + f(self.err.code) + } else { + self + } + } +} + +impl Display for ErrorCode { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + match self { + ErrorCode::Message(msg) => f.write_str(msg), + ErrorCode::Io(err) => Display::fmt(err, f), + ErrorCode::EofWhileParsingList => f.write_str("EOF while parsing a list"), + ErrorCode::EofWhileParsingObject => f.write_str("EOF while parsing an object"), + ErrorCode::EofWhileParsingString => f.write_str("EOF while parsing a string"), + ErrorCode::EofWhileParsingValue => f.write_str("EOF while parsing a value"), + ErrorCode::ExpectedColon => f.write_str("expected `:`"), + ErrorCode::ExpectedListCommaOrEnd => f.write_str("expected `,` or `]`"), + ErrorCode::ExpectedObjectCommaOrEnd => f.write_str("expected `,` or `}`"), + ErrorCode::ExpectedSomeIdent => f.write_str("expected ident"), + ErrorCode::ExpectedSomeValue => f.write_str("expected value"), + ErrorCode::InvalidEscape => f.write_str("invalid escape"), + ErrorCode::InvalidNumber => f.write_str("invalid number"), + ErrorCode::NumberOutOfRange => f.write_str("number out of range"), + ErrorCode::InvalidUnicodeCodePoint => f.write_str("invalid unicode code point"), + ErrorCode::ControlCharacterWhileParsingString => { + f.write_str("control character (\\u0000-\\u001F) found while parsing a string") + } + ErrorCode::KeyMustBeAString => f.write_str("key must be a string"), + ErrorCode::LoneLeadingSurrogateInHexEscape => { + f.write_str("lone leading surrogate in hex escape") + } + ErrorCode::TrailingComma => f.write_str("trailing comma"), + ErrorCode::TrailingCharacters => f.write_str("trailing characters"), + ErrorCode::UnexpectedEndOfHexEscape => f.write_str("unexpected end of hex escape"), + ErrorCode::RecursionLimitExceeded => f.write_str("recursion limit exceeded"), + } + } +} + +impl serde::de::StdError for Error { + #[cfg(feature = "std")] + fn source(&self) -> Option<&(dyn error::Error + 'static)> { + match &self.err.code { + ErrorCode::Io(err) => Some(err), + _ => None, + } + } +} + +impl Display for Error { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&*self.err, f) + } +} + +impl Display for ErrorImpl { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + if self.line == 0 { + Display::fmt(&self.code, f) + } else { + write!( + f, + "{} at line {} column {}", + self.code, self.line, self.column + ) + } + } +} + +// Remove two layers of verbosity from the debug representation. Humans often +// end up seeing this representation because it is what unwrap() shows. +impl Debug for Error { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + write!( + f, + "Error({:?}, line: {}, column: {})", + self.err.code.to_string(), + self.err.line, + self.err.column + ) + } +} + +impl de::Error for Error { + #[cold] + fn custom<T: Display>(msg: T) -> Error { + make_error(msg.to_string()) + } + + #[cold] + fn invalid_type(unexp: de::Unexpected, exp: &dyn de::Expected) -> Self { + if let de::Unexpected::Unit = unexp { + Error::custom(format_args!("invalid type: null, expected {}", exp)) + } else { + Error::custom(format_args!("invalid type: {}, expected {}", unexp, exp)) + } + } +} + +impl ser::Error for Error { + #[cold] + fn custom<T: Display>(msg: T) -> Error { + make_error(msg.to_string()) + } +} + +// Parse our own error message that looks like "{} at line {} column {}" to work +// around erased-serde round-tripping the error through de::Error::custom. +fn make_error(mut msg: String) -> Error { + let (line, column) = parse_line_col(&mut msg).unwrap_or((0, 0)); + Error { + err: Box::new(ErrorImpl { + code: ErrorCode::Message(msg.into_boxed_str()), + line, + column, + }), + } +} + +fn parse_line_col(msg: &mut String) -> Option<(usize, usize)> { + let start_of_suffix = match msg.rfind(" at line ") { + Some(index) => index, + None => return None, + }; + + // Find start and end of line number. + let start_of_line = start_of_suffix + " at line ".len(); + let mut end_of_line = start_of_line; + while starts_with_digit(&msg[end_of_line..]) { + end_of_line += 1; + } + + if !msg[end_of_line..].starts_with(" column ") { + return None; + } + + // Find start and end of column number. + let start_of_column = end_of_line + " column ".len(); + let mut end_of_column = start_of_column; + while starts_with_digit(&msg[end_of_column..]) { + end_of_column += 1; + } + + if end_of_column < msg.len() { + return None; + } + + // Parse numbers. + let line = match usize::from_str(&msg[start_of_line..end_of_line]) { + Ok(line) => line, + Err(_) => return None, + }; + let column = match usize::from_str(&msg[start_of_column..end_of_column]) { + Ok(column) => column, + Err(_) => return None, + }; + + msg.truncate(start_of_suffix); + Some((line, column)) +} + +fn starts_with_digit(slice: &str) -> bool { + match slice.as_bytes().first() { + None => false, + Some(&byte) => byte >= b'0' && byte <= b'9', + } +} diff --git a/vendor/serde_json/src/features_check/error.rs b/vendor/serde_json/src/features_check/error.rs new file mode 100644 index 000000000..22e58235c --- /dev/null +++ b/vendor/serde_json/src/features_check/error.rs @@ -0,0 +1 @@ +"serde_json requires that either `std` (default) or `alloc` feature is enabled" diff --git a/vendor/serde_json/src/features_check/mod.rs b/vendor/serde_json/src/features_check/mod.rs new file mode 100644 index 000000000..d12032cef --- /dev/null +++ b/vendor/serde_json/src/features_check/mod.rs @@ -0,0 +1,13 @@ +//! Shows a user-friendly compiler error on incompatible selected features. + +#[allow(unused_macros)] +macro_rules! hide_from_rustfmt { + ($mod:item) => { + $mod + }; +} + +#[cfg(not(any(feature = "std", feature = "alloc")))] +hide_from_rustfmt! { + mod error; +} diff --git a/vendor/serde_json/src/io/core.rs b/vendor/serde_json/src/io/core.rs new file mode 100644 index 000000000..465ab8b24 --- /dev/null +++ b/vendor/serde_json/src/io/core.rs @@ -0,0 +1,79 @@ +//! Reimplements core logic and types from `std::io` in an `alloc`-friendly +//! fashion. + +use alloc::vec::Vec; +use core::fmt::{self, Display}; +use core::result; + +pub enum ErrorKind { + Other, +} + +// IO errors can never occur in no-std mode. All our no-std IO implementations +// are infallible. +pub struct Error; + +impl Display for Error { + fn fmt(&self, _formatter: &mut fmt::Formatter<'_>) -> fmt::Result { + unreachable!() + } +} + +impl Error { + pub(crate) fn new(_kind: ErrorKind, _error: &'static str) -> Error { + Error + } +} + +pub type Result<T> = result::Result<T, Error>; + +pub trait Write { + fn write(&mut self, buf: &[u8]) -> Result<usize>; + + fn write_all(&mut self, buf: &[u8]) -> Result<()> { + // All our Write impls in no_std mode always write the whole buffer in + // one call infallibly. + let result = self.write(buf); + debug_assert!(result.is_ok()); + debug_assert_eq!(result.unwrap_or(0), buf.len()); + Ok(()) + } + + fn flush(&mut self) -> Result<()>; +} + +impl<W: Write> Write for &mut W { + #[inline] + fn write(&mut self, buf: &[u8]) -> Result<usize> { + (*self).write(buf) + } + + #[inline] + fn write_all(&mut self, buf: &[u8]) -> Result<()> { + (*self).write_all(buf) + } + + #[inline] + fn flush(&mut self) -> Result<()> { + (*self).flush() + } +} + +impl Write for Vec<u8> { + #[inline] + fn write(&mut self, buf: &[u8]) -> Result<usize> { + self.extend_from_slice(buf); + Ok(buf.len()) + } + + #[inline] + fn write_all(&mut self, buf: &[u8]) -> Result<()> { + self.extend_from_slice(buf); + Ok(()) + } + + #[inline] + fn flush(&mut self) -> Result<()> { + Ok(()) + } +} diff --git a/vendor/serde_json/src/io/mod.rs b/vendor/serde_json/src/io/mod.rs new file mode 100644 index 000000000..9dee4a068 --- /dev/null +++ b/vendor/serde_json/src/io/mod.rs @@ -0,0 +1,20 @@ +//! A tiny, `no_std`-friendly facade around `std::io`. +//! Reexports types from `std` when available; otherwise reimplements and +//! provides some of the core logic. +//! +//! The main reason that `std::io` hasn't found itself reexported as part of +//! the `core` crate is the `std::io::{Read, Write}` traits' reliance on +//! `std::io::Error`, which may contain internally a heap-allocated `Box<Error>` +//! and/or now relying on OS-specific `std::backtrace::Backtrace`. + +pub use self::imp::{Error, ErrorKind, Result, Write}; + +#[cfg(not(feature = "std"))] +#[path = "core.rs"] +mod imp; + +#[cfg(feature = "std")] +use std::io as imp; + +#[cfg(feature = "std")] +pub use std::io::{Bytes, Read}; diff --git a/vendor/serde_json/src/iter.rs b/vendor/serde_json/src/iter.rs new file mode 100644 index 000000000..9792916dc --- /dev/null +++ b/vendor/serde_json/src/iter.rs @@ -0,0 +1,70 @@ +use crate::io; + +pub struct LineColIterator<I> { + iter: I, + + /// Index of the current line. Characters in the first line of the input + /// (before the first newline character) are in line 1. + line: usize, + + /// Index of the current column. The first character in the input and any + /// characters immediately following a newline character are in column 1. + /// The column is 0 immediately after a newline character has been read. + col: usize, + + /// Byte offset of the start of the current line. This is the sum of lengths + /// of all previous lines. Keeping track of things this way allows efficient + /// computation of the current line, column, and byte offset while only + /// updating one of the counters in `next()` in the common case. + start_of_line: usize, +} + +impl<I> LineColIterator<I> +where + I: Iterator<Item = io::Result<u8>>, +{ + pub fn new(iter: I) -> LineColIterator<I> { + LineColIterator { + iter, + line: 1, + col: 0, + start_of_line: 0, + } + } + + pub fn line(&self) -> usize { + self.line + } + + pub fn col(&self) -> usize { + self.col + } + + pub fn byte_offset(&self) -> usize { + self.start_of_line + self.col + } +} + +impl<I> Iterator for LineColIterator<I> +where + I: Iterator<Item = io::Result<u8>>, +{ + type Item = io::Result<u8>; + + fn next(&mut self) -> Option<io::Result<u8>> { + match self.iter.next() { + None => None, + Some(Ok(b'\n')) => { + self.start_of_line += self.col + 1; + self.line += 1; + self.col = 0; + Some(Ok(b'\n')) + } + Some(Ok(c)) => { + self.col += 1; + Some(Ok(c)) + } + Some(Err(e)) => Some(Err(e)), + } + } +} diff --git a/vendor/serde_json/src/lexical/algorithm.rs b/vendor/serde_json/src/lexical/algorithm.rs new file mode 100644 index 000000000..a2cbf18af --- /dev/null +++ b/vendor/serde_json/src/lexical/algorithm.rs @@ -0,0 +1,193 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Algorithms to efficiently convert strings to floats. + +use super::bhcomp::*; +use super::cached::*; +use super::errors::*; +use super::float::ExtendedFloat; +use super::num::*; +use super::small_powers::*; + +// FAST +// ---- + +/// Convert mantissa to exact value for a non-base2 power. +/// +/// Returns the resulting float and if the value can be represented exactly. +pub(crate) fn fast_path<F>(mantissa: u64, exponent: i32) -> Option<F> +where + F: Float, +{ + // `mantissa >> (F::MANTISSA_SIZE+1) != 0` effectively checks if the + // value has a no bits above the hidden bit, which is what we want. + let (min_exp, max_exp) = F::exponent_limit(); + let shift_exp = F::mantissa_limit(); + let mantissa_size = F::MANTISSA_SIZE + 1; + if mantissa == 0 { + Some(F::ZERO) + } else if mantissa >> mantissa_size != 0 { + // Would require truncation of the mantissa. + None + } else if exponent == 0 { + // 0 exponent, same as value, exact representation. + let float = F::as_cast(mantissa); + Some(float) + } else if exponent >= min_exp && exponent <= max_exp { + // Value can be exactly represented, return the value. + // Do not use powi, since powi can incrementally introduce + // error. + let float = F::as_cast(mantissa); + Some(float.pow10(exponent)) + } else if exponent >= 0 && exponent <= max_exp + shift_exp { + // Check to see if we have a disguised fast-path, where the + // number of digits in the mantissa is very small, but and + // so digits can be shifted from the exponent to the mantissa. + // https://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/ + let small_powers = POW10_64; + let shift = exponent - max_exp; + let power = small_powers[shift as usize]; + + // Compute the product of the power, if it overflows, + // prematurely return early, otherwise, if we didn't overshoot, + // we can get an exact value. + let value = mantissa.checked_mul(power)?; + if value >> mantissa_size != 0 { + None + } else { + // Use powi, since it's correct, and faster on + // the fast-path. + let float = F::as_cast(value); + Some(float.pow10(max_exp)) + } + } else { + // Cannot be exactly represented, exponent too small or too big, + // would require truncation. + None + } +} + +// MODERATE +// -------- + +/// Multiply the floating-point by the exponent. +/// +/// Multiply by pre-calculated powers of the base, modify the extended- +/// float, and return if new value and if the value can be represented +/// accurately. +fn multiply_exponent_extended<F>(fp: &mut ExtendedFloat, exponent: i32, truncated: bool) -> bool +where + F: Float, +{ + let powers = ExtendedFloat::get_powers(); + let exponent = exponent.saturating_add(powers.bias); + let small_index = exponent % powers.step; + let large_index = exponent / powers.step; + if exponent < 0 { + // Guaranteed underflow (assign 0). + fp.mant = 0; + true + } else if large_index as usize >= powers.large.len() { + // Overflow (assign infinity) + fp.mant = 1 << 63; + fp.exp = 0x7FF; + true + } else { + // Within the valid exponent range, multiply by the large and small + // exponents and return the resulting value. + + // Track errors to as a factor of unit in last-precision. + let mut errors: u32 = 0; + if truncated { + errors += u64::error_halfscale(); + } + + // Multiply by the small power. + // Check if we can directly multiply by an integer, if not, + // use extended-precision multiplication. + match fp + .mant + .overflowing_mul(powers.get_small_int(small_index as usize)) + { + // Overflow, multiplication unsuccessful, go slow path. + (_, true) => { + fp.normalize(); + fp.imul(&powers.get_small(small_index as usize)); + errors += u64::error_halfscale(); + } + // No overflow, multiplication successful. + (mant, false) => { + fp.mant = mant; + fp.normalize(); + } + } + + // Multiply by the large power + fp.imul(&powers.get_large(large_index as usize)); + if errors > 0 { + errors += 1; + } + errors += u64::error_halfscale(); + + // Normalize the floating point (and the errors). + let shift = fp.normalize(); + errors <<= shift; + + u64::error_is_accurate::<F>(errors, fp) + } +} + +/// Create a precise native float using an intermediate extended-precision float. +/// +/// Return the float approximation and if the value can be accurately +/// represented with mantissa bits of precision. +#[inline] +pub(crate) fn moderate_path<F>( + mantissa: u64, + exponent: i32, + truncated: bool, +) -> (ExtendedFloat, bool) +where + F: Float, +{ + let mut fp = ExtendedFloat { + mant: mantissa, + exp: 0, + }; + let valid = multiply_exponent_extended::<F>(&mut fp, exponent, truncated); + (fp, valid) +} + +// FALLBACK +// -------- + +/// Fallback path when the fast path does not work. +/// +/// Uses the moderate path, if applicable, otherwise, uses the slow path +/// as required. +pub(crate) fn fallback_path<F>( + integer: &[u8], + fraction: &[u8], + mantissa: u64, + exponent: i32, + mantissa_exponent: i32, + truncated: bool, +) -> F +where + F: Float, +{ + // Moderate path (use an extended 80-bit representation). + let (fp, valid) = moderate_path::<F>(mantissa, mantissa_exponent, truncated); + if valid { + return fp.into_float::<F>(); + } + + // Slow path, fast path didn't work. + let b = fp.into_downward_float::<F>(); + if b.is_special() { + // We have a non-finite number, we get to leave early. + b + } else { + bhcomp(b, integer, fraction, exponent) + } +} diff --git a/vendor/serde_json/src/lexical/bhcomp.rs b/vendor/serde_json/src/lexical/bhcomp.rs new file mode 100644 index 000000000..1f2a7bbde --- /dev/null +++ b/vendor/serde_json/src/lexical/bhcomp.rs @@ -0,0 +1,218 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Compare the mantissa to the halfway representation of the float. +//! +//! Compares the actual significant digits of the mantissa to the +//! theoretical digits from `b+h`, scaled into the proper range. + +use super::bignum::*; +use super::digit::*; +use super::exponent::*; +use super::float::*; +use super::math::*; +use super::num::*; +use super::rounding::*; +use core::{cmp, mem}; + +// MANTISSA + +/// Parse the full mantissa into a big integer. +/// +/// Max digits is the maximum number of digits plus one. +fn parse_mantissa<F>(integer: &[u8], fraction: &[u8]) -> Bigint +where + F: Float, +{ + // Main loop + let small_powers = POW10_LIMB; + let step = small_powers.len() - 2; + let max_digits = F::MAX_DIGITS - 1; + let mut counter = 0; + let mut value: Limb = 0; + let mut i: usize = 0; + let mut result = Bigint::default(); + + // Iteratively process all the data in the mantissa. + for &digit in integer.iter().chain(fraction) { + // We've parsed the max digits using small values, add to bignum + if counter == step { + result.imul_small(small_powers[counter]); + result.iadd_small(value); + counter = 0; + value = 0; + } + + value *= 10; + value += as_limb(to_digit(digit).unwrap()); + + i += 1; + counter += 1; + if i == max_digits { + break; + } + } + + // We will always have a remainder, as long as we entered the loop + // once, or counter % step is 0. + if counter != 0 { + result.imul_small(small_powers[counter]); + result.iadd_small(value); + } + + // If we have any remaining digits after the last value, we need + // to add a 1 after the rest of the array, it doesn't matter where, + // just move it up. This is good for the worst-possible float + // representation. We also need to return an index. + // Since we already trimmed trailing zeros, we know there has + // to be a non-zero digit if there are any left. + if i < integer.len() + fraction.len() { + result.imul_small(10); + result.iadd_small(1); + } + + result +} + +// FLOAT OPS + +/// Calculate `b` from a a representation of `b` as a float. +#[inline] +pub(super) fn b_extended<F: Float>(f: F) -> ExtendedFloat { + ExtendedFloat::from_float(f) +} + +/// Calculate `b+h` from a a representation of `b` as a float. +#[inline] +pub(super) fn bh_extended<F: Float>(f: F) -> ExtendedFloat { + // None of these can overflow. + let b = b_extended(f); + ExtendedFloat { + mant: (b.mant << 1) + 1, + exp: b.exp - 1, + } +} + +// ROUNDING + +/// Custom round-nearest, tie-event algorithm for bhcomp. +#[inline] +fn round_nearest_tie_even(fp: &mut ExtendedFloat, shift: i32, is_truncated: bool) { + let (mut is_above, mut is_halfway) = round_nearest(fp, shift); + if is_halfway && is_truncated { + is_above = true; + is_halfway = false; + } + tie_even(fp, is_above, is_halfway); +} + +// BHCOMP + +/// Calculate the mantissa for a big integer with a positive exponent. +fn large_atof<F>(mantissa: Bigint, exponent: i32) -> F +where + F: Float, +{ + let bits = mem::size_of::<u64>() * 8; + + // Simple, we just need to multiply by the power of the radix. + // Now, we can calculate the mantissa and the exponent from this. + // The binary exponent is the binary exponent for the mantissa + // shifted to the hidden bit. + let mut bigmant = mantissa; + bigmant.imul_pow10(exponent as u32); + + // Get the exact representation of the float from the big integer. + let (mant, is_truncated) = bigmant.hi64(); + let exp = bigmant.bit_length() as i32 - bits as i32; + let mut fp = ExtendedFloat { mant, exp }; + fp.round_to_native::<F, _>(|fp, shift| round_nearest_tie_even(fp, shift, is_truncated)); + into_float(fp) +} + +/// Calculate the mantissa for a big integer with a negative exponent. +/// +/// This invokes the comparison with `b+h`. +fn small_atof<F>(mantissa: Bigint, exponent: i32, f: F) -> F +where + F: Float, +{ + // Get the significant digits and radix exponent for the real digits. + let mut real_digits = mantissa; + let real_exp = exponent; + debug_assert!(real_exp < 0); + + // Get the significant digits and the binary exponent for `b+h`. + let theor = bh_extended(f); + let mut theor_digits = Bigint::from_u64(theor.mant); + let theor_exp = theor.exp; + + // We need to scale the real digits and `b+h` digits to be the same + // order. We currently have `real_exp`, in `radix`, that needs to be + // shifted to `theor_digits` (since it is negative), and `theor_exp` + // to either `theor_digits` or `real_digits` as a power of 2 (since it + // may be positive or negative). Try to remove as many powers of 2 + // as possible. All values are relative to `theor_digits`, that is, + // reflect the power you need to multiply `theor_digits` by. + + // Can remove a power-of-two, since the radix is 10. + // Both are on opposite-sides of equation, can factor out a + // power of two. + // + // Example: 10^-10, 2^-10 -> ( 0, 10, 0) + // Example: 10^-10, 2^-15 -> (-5, 10, 0) + // Example: 10^-10, 2^-5 -> ( 5, 10, 0) + // Example: 10^-10, 2^5 -> (15, 10, 0) + let binary_exp = theor_exp - real_exp; + let halfradix_exp = -real_exp; + let radix_exp = 0; + + // Carry out our multiplication. + if halfradix_exp != 0 { + theor_digits.imul_pow5(halfradix_exp as u32); + } + if radix_exp != 0 { + theor_digits.imul_pow10(radix_exp as u32); + } + if binary_exp > 0 { + theor_digits.imul_pow2(binary_exp as u32); + } else if binary_exp < 0 { + real_digits.imul_pow2(-binary_exp as u32); + } + + // Compare real digits to theoretical digits and round the float. + match real_digits.compare(&theor_digits) { + cmp::Ordering::Greater => f.next_positive(), + cmp::Ordering::Less => f, + cmp::Ordering::Equal => f.round_positive_even(), + } +} + +/// Calculate the exact value of the float. +/// +/// Note: fraction must not have trailing zeros. +pub(crate) fn bhcomp<F>(b: F, integer: &[u8], mut fraction: &[u8], exponent: i32) -> F +where + F: Float, +{ + // Calculate the number of integer digits and use that to determine + // where the significant digits start in the fraction. + let integer_digits = integer.len(); + let fraction_digits = fraction.len(); + let digits_start = if integer_digits == 0 { + let start = fraction.iter().take_while(|&x| *x == b'0').count(); + fraction = &fraction[start..]; + start + } else { + 0 + }; + let sci_exp = scientific_exponent(exponent, integer_digits, digits_start); + let count = F::MAX_DIGITS.min(integer_digits + fraction_digits - digits_start); + let scaled_exponent = sci_exp + 1 - count as i32; + + let mantissa = parse_mantissa::<F>(integer, fraction); + if scaled_exponent >= 0 { + large_atof(mantissa, scaled_exponent) + } else { + small_atof(mantissa, scaled_exponent, b) + } +} diff --git a/vendor/serde_json/src/lexical/bignum.rs b/vendor/serde_json/src/lexical/bignum.rs new file mode 100644 index 000000000..f9551f534 --- /dev/null +++ b/vendor/serde_json/src/lexical/bignum.rs @@ -0,0 +1,33 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Big integer type definition. + +use super::math::*; +use alloc::vec::Vec; + +/// Storage for a big integer type. +#[derive(Clone, PartialEq, Eq)] +pub(crate) struct Bigint { + /// Internal storage for the Bigint, in little-endian order. + pub(crate) data: Vec<Limb>, +} + +impl Default for Bigint { + fn default() -> Self { + Bigint { + data: Vec::with_capacity(20), + } + } +} + +impl Math for Bigint { + #[inline] + fn data(&self) -> &Vec<Limb> { + &self.data + } + + #[inline] + fn data_mut(&mut self) -> &mut Vec<Limb> { + &mut self.data + } +} diff --git a/vendor/serde_json/src/lexical/cached.rs b/vendor/serde_json/src/lexical/cached.rs new file mode 100644 index 000000000..ef5a9fe54 --- /dev/null +++ b/vendor/serde_json/src/lexical/cached.rs @@ -0,0 +1,82 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Cached powers trait for extended-precision floats. + +use super::cached_float80; +use super::float::ExtendedFloat; + +// POWERS + +/// Precalculated powers that uses two-separate arrays for memory-efficiency. +#[doc(hidden)] +pub(crate) struct ExtendedFloatArray { + // Pre-calculated mantissa for the powers. + pub mant: &'static [u64], + // Pre-calculated binary exponents for the powers. + pub exp: &'static [i32], +} + +/// Allow indexing of values without bounds checking +impl ExtendedFloatArray { + #[inline] + pub fn get_extended_float(&self, index: usize) -> ExtendedFloat { + let mant = self.mant[index]; + let exp = self.exp[index]; + ExtendedFloat { mant, exp } + } + + #[inline] + pub fn len(&self) -> usize { + self.mant.len() + } +} + +// MODERATE PATH POWERS + +/// Precalculated powers of base N for the moderate path. +#[doc(hidden)] +pub(crate) struct ModeratePathPowers { + // Pre-calculated small powers. + pub small: ExtendedFloatArray, + // Pre-calculated large powers. + pub large: ExtendedFloatArray, + /// Pre-calculated small powers as 64-bit integers + pub small_int: &'static [u64], + // Step between large powers and number of small powers. + pub step: i32, + // Exponent bias for the large powers. + pub bias: i32, +} + +/// Allow indexing of values without bounds checking +impl ModeratePathPowers { + #[inline] + pub fn get_small(&self, index: usize) -> ExtendedFloat { + self.small.get_extended_float(index) + } + + #[inline] + pub fn get_large(&self, index: usize) -> ExtendedFloat { + self.large.get_extended_float(index) + } + + #[inline] + pub fn get_small_int(&self, index: usize) -> u64 { + self.small_int[index] + } +} + +// CACHED EXTENDED POWERS + +/// Cached powers as a trait for a floating-point type. +pub(crate) trait ModeratePathCache { + /// Get cached powers. + fn get_powers() -> &'static ModeratePathPowers; +} + +impl ModeratePathCache for ExtendedFloat { + #[inline] + fn get_powers() -> &'static ModeratePathPowers { + cached_float80::get_powers() + } +} diff --git a/vendor/serde_json/src/lexical/cached_float80.rs b/vendor/serde_json/src/lexical/cached_float80.rs new file mode 100644 index 000000000..9beda3ddb --- /dev/null +++ b/vendor/serde_json/src/lexical/cached_float80.rs @@ -0,0 +1,206 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Cached exponents for basen values with 80-bit extended floats. +//! +//! Exact versions of base**n as an extended-precision float, with both +//! large and small powers. Use the large powers to minimize the amount +//! of compounded error. +//! +//! These values were calculated using Python, using the arbitrary-precision +//! integer to calculate exact extended-representation of each value. +//! These values are all normalized. + +use super::cached::{ExtendedFloatArray, ModeratePathPowers}; + +// LOW-LEVEL +// --------- + +// BASE10 + +const BASE10_SMALL_MANTISSA: [u64; 10] = [ + 9223372036854775808, // 10^0 + 11529215046068469760, // 10^1 + 14411518807585587200, // 10^2 + 18014398509481984000, // 10^3 + 11258999068426240000, // 10^4 + 14073748835532800000, // 10^5 + 17592186044416000000, // 10^6 + 10995116277760000000, // 10^7 + 13743895347200000000, // 10^8 + 17179869184000000000, // 10^9 +]; +const BASE10_SMALL_EXPONENT: [i32; 10] = [ + -63, // 10^0 + -60, // 10^1 + -57, // 10^2 + -54, // 10^3 + -50, // 10^4 + -47, // 10^5 + -44, // 10^6 + -40, // 10^7 + -37, // 10^8 + -34, // 10^9 +]; +const BASE10_LARGE_MANTISSA: [u64; 66] = [ + 11555125961253852697, // 10^-350 + 13451937075301367670, // 10^-340 + 15660115838168849784, // 10^-330 + 18230774251475056848, // 10^-320 + 10611707258198326947, // 10^-310 + 12353653155963782858, // 10^-300 + 14381545078898527261, // 10^-290 + 16742321987285426889, // 10^-280 + 9745314011399999080, // 10^-270 + 11345038669416679861, // 10^-260 + 13207363278391631158, // 10^-250 + 15375394465392026070, // 10^-240 + 17899314949046850752, // 10^-230 + 10418772551374772303, // 10^-220 + 12129047596099288555, // 10^-210 + 14120069793541087484, // 10^-200 + 16437924692338667210, // 10^-190 + 9568131466127621947, // 10^-180 + 11138771039116687545, // 10^-170 + 12967236152753102995, // 10^-160 + 15095849699286165408, // 10^-150 + 17573882009934360870, // 10^-140 + 10229345649675443343, // 10^-130 + 11908525658859223294, // 10^-120 + 13863348470604074297, // 10^-110 + 16139061738043178685, // 10^-100 + 9394170331095332911, // 10^-90 + 10936253623915059621, // 10^-80 + 12731474852090538039, // 10^-70 + 14821387422376473014, // 10^-60 + 17254365866976409468, // 10^-50 + 10043362776618689222, // 10^-40 + 11692013098647223345, // 10^-30 + 13611294676837538538, // 10^-20 + 15845632502852867518, // 10^-10 + 9223372036854775808, // 10^0 + 10737418240000000000, // 10^10 + 12500000000000000000, // 10^20 + 14551915228366851806, // 10^30 + 16940658945086006781, // 10^40 + 9860761315262647567, // 10^50 + 11479437019748901445, // 10^60 + 13363823550460978230, // 10^70 + 15557538194652854267, // 10^80 + 18111358157653424735, // 10^90 + 10542197943230523224, // 10^100 + 12272733663244316382, // 10^110 + 14287342391028437277, // 10^120 + 16632655625031838749, // 10^130 + 9681479787123295682, // 10^140 + 11270725851789228247, // 10^150 + 13120851772591970218, // 10^160 + 15274681817498023410, // 10^170 + 17782069995880619867, // 10^180 + 10350527006597618960, // 10^190 + 12049599325514420588, // 10^200 + 14027579833653779454, // 10^210 + 16330252207878254650, // 10^220 + 9505457831475799117, // 10^230 + 11065809325636130661, // 10^240 + 12882297539194266616, // 10^250 + 14996968138956309548, // 10^260 + 17458768723248864463, // 10^270 + 10162340898095201970, // 10^280 + 11830521861667747109, // 10^290 + 13772540099066387756, // 10^300 +]; +const BASE10_LARGE_EXPONENT: [i32; 66] = [ + -1226, // 10^-350 + -1193, // 10^-340 + -1160, // 10^-330 + -1127, // 10^-320 + -1093, // 10^-310 + -1060, // 10^-300 + -1027, // 10^-290 + -994, // 10^-280 + -960, // 10^-270 + -927, // 10^-260 + -894, // 10^-250 + -861, // 10^-240 + -828, // 10^-230 + -794, // 10^-220 + -761, // 10^-210 + -728, // 10^-200 + -695, // 10^-190 + -661, // 10^-180 + -628, // 10^-170 + -595, // 10^-160 + -562, // 10^-150 + -529, // 10^-140 + -495, // 10^-130 + -462, // 10^-120 + -429, // 10^-110 + -396, // 10^-100 + -362, // 10^-90 + -329, // 10^-80 + -296, // 10^-70 + -263, // 10^-60 + -230, // 10^-50 + -196, // 10^-40 + -163, // 10^-30 + -130, // 10^-20 + -97, // 10^-10 + -63, // 10^0 + -30, // 10^10 + 3, // 10^20 + 36, // 10^30 + 69, // 10^40 + 103, // 10^50 + 136, // 10^60 + 169, // 10^70 + 202, // 10^80 + 235, // 10^90 + 269, // 10^100 + 302, // 10^110 + 335, // 10^120 + 368, // 10^130 + 402, // 10^140 + 435, // 10^150 + 468, // 10^160 + 501, // 10^170 + 534, // 10^180 + 568, // 10^190 + 601, // 10^200 + 634, // 10^210 + 667, // 10^220 + 701, // 10^230 + 734, // 10^240 + 767, // 10^250 + 800, // 10^260 + 833, // 10^270 + 867, // 10^280 + 900, // 10^290 + 933, // 10^300 +]; +const BASE10_SMALL_INT_POWERS: [u64; 10] = [ + 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, +]; +const BASE10_STEP: i32 = 10; +const BASE10_BIAS: i32 = 350; + +// HIGH LEVEL +// ---------- + +const BASE10_POWERS: ModeratePathPowers = ModeratePathPowers { + small: ExtendedFloatArray { + mant: &BASE10_SMALL_MANTISSA, + exp: &BASE10_SMALL_EXPONENT, + }, + large: ExtendedFloatArray { + mant: &BASE10_LARGE_MANTISSA, + exp: &BASE10_LARGE_EXPONENT, + }, + small_int: &BASE10_SMALL_INT_POWERS, + step: BASE10_STEP, + bias: BASE10_BIAS, +}; + +/// Get powers from base. +pub(crate) fn get_powers() -> &'static ModeratePathPowers { + &BASE10_POWERS +} diff --git a/vendor/serde_json/src/lexical/digit.rs b/vendor/serde_json/src/lexical/digit.rs new file mode 100644 index 000000000..882aa9eef --- /dev/null +++ b/vendor/serde_json/src/lexical/digit.rs @@ -0,0 +1,15 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Helpers to convert and add digits from characters. + +// Convert u8 to digit. +#[inline] +pub(crate) fn to_digit(c: u8) -> Option<u32> { + (c as char).to_digit(10) +} + +// Add digit to mantissa. +#[inline] +pub(crate) fn add_digit(value: u64, digit: u32) -> Option<u64> { + value.checked_mul(10)?.checked_add(digit as u64) +} diff --git a/vendor/serde_json/src/lexical/errors.rs b/vendor/serde_json/src/lexical/errors.rs new file mode 100644 index 000000000..cad4bd3d5 --- /dev/null +++ b/vendor/serde_json/src/lexical/errors.rs @@ -0,0 +1,133 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Estimate the error in an 80-bit approximation of a float. +//! +//! This estimates the error in a floating-point representation. +//! +//! This implementation is loosely based off the Golang implementation, +//! found here: +//! https://golang.org/src/strconv/atof.go + +use super::float::*; +use super::num::*; +use super::rounding::*; + +pub(crate) trait FloatErrors { + /// Get the full error scale. + fn error_scale() -> u32; + /// Get the half error scale. + fn error_halfscale() -> u32; + /// Determine if the number of errors is tolerable for float precision. + fn error_is_accurate<F: Float>(count: u32, fp: &ExtendedFloat) -> bool; +} + +/// Check if the error is accurate with a round-nearest rounding scheme. +#[inline] +fn nearest_error_is_accurate(errors: u64, fp: &ExtendedFloat, extrabits: u64) -> bool { + // Round-to-nearest, need to use the halfway point. + if extrabits == 65 { + // Underflow, we have a shift larger than the mantissa. + // Representation is valid **only** if the value is close enough + // overflow to the next bit within errors. If it overflows, + // the representation is **not** valid. + !fp.mant.overflowing_add(errors).1 + } else { + let mask: u64 = lower_n_mask(extrabits); + let extra: u64 = fp.mant & mask; + + // Round-to-nearest, need to check if we're close to halfway. + // IE, b10100 | 100000, where `|` signifies the truncation point. + let halfway: u64 = lower_n_halfway(extrabits); + let cmp1 = halfway.wrapping_sub(errors) < extra; + let cmp2 = extra < halfway.wrapping_add(errors); + + // If both comparisons are true, we have significant rounding error, + // and the value cannot be exactly represented. Otherwise, the + // representation is valid. + !(cmp1 && cmp2) + } +} + +impl FloatErrors for u64 { + #[inline] + fn error_scale() -> u32 { + 8 + } + + #[inline] + fn error_halfscale() -> u32 { + u64::error_scale() / 2 + } + + #[inline] + fn error_is_accurate<F: Float>(count: u32, fp: &ExtendedFloat) -> bool { + // Determine if extended-precision float is a good approximation. + // If the error has affected too many units, the float will be + // inaccurate, or if the representation is too close to halfway + // that any operations could affect this halfway representation. + // See the documentation for dtoa for more information. + let bias = -(F::EXPONENT_BIAS - F::MANTISSA_SIZE); + let denormal_exp = bias - 63; + // This is always a valid u32, since (denormal_exp - fp.exp) + // will always be positive and the significand size is {23, 52}. + let extrabits = if fp.exp <= denormal_exp { + 64 - F::MANTISSA_SIZE + denormal_exp - fp.exp + } else { + 63 - F::MANTISSA_SIZE + }; + + // Our logic is as follows: we want to determine if the actual + // mantissa and the errors during calculation differ significantly + // from the rounding point. The rounding point for round-nearest + // is the halfway point, IE, this when the truncated bits start + // with b1000..., while the rounding point for the round-toward + // is when the truncated bits are equal to 0. + // To do so, we can check whether the rounding point +/- the error + // are >/< the actual lower n bits. + // + // For whether we need to use signed or unsigned types for this + // analysis, see this example, using u8 rather than u64 to simplify + // things. + // + // # Comparisons + // cmp1 = (halfway - errors) < extra + // cmp1 = extra < (halfway + errors) + // + // # Large Extrabits, Low Errors + // + // extrabits = 8 + // halfway = 0b10000000 + // extra = 0b10000010 + // errors = 0b00000100 + // halfway - errors = 0b01111100 + // halfway + errors = 0b10000100 + // + // Unsigned: + // halfway - errors = 124 + // halfway + errors = 132 + // extra = 130 + // cmp1 = true + // cmp2 = true + // Signed: + // halfway - errors = 124 + // halfway + errors = -124 + // extra = -126 + // cmp1 = false + // cmp2 = true + // + // # Conclusion + // + // Since errors will always be small, and since we want to detect + // if the representation is accurate, we need to use an **unsigned** + // type for comparisons. + + let extrabits = extrabits as u64; + let errors = count as u64; + if extrabits > 65 { + // Underflow, we have a literal 0. + return true; + } + + nearest_error_is_accurate(errors, fp, extrabits) + } +} diff --git a/vendor/serde_json/src/lexical/exponent.rs b/vendor/serde_json/src/lexical/exponent.rs new file mode 100644 index 000000000..6fc51977e --- /dev/null +++ b/vendor/serde_json/src/lexical/exponent.rs @@ -0,0 +1,50 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Utilities to calculate exponents. + +/// Convert usize into i32 without overflow. +/// +/// This is needed to ensure when adjusting the exponent relative to +/// the mantissa we do not overflow for comically-long exponents. +#[inline] +fn into_i32(value: usize) -> i32 { + if value > i32::max_value() as usize { + i32::max_value() + } else { + value as i32 + } +} + +// EXPONENT CALCULATION + +// Calculate the scientific notation exponent without overflow. +// +// For example, 0.1 would be -1, and 10 would be 1 in base 10. +#[inline] +pub(crate) fn scientific_exponent( + exponent: i32, + integer_digits: usize, + fraction_start: usize, +) -> i32 { + if integer_digits == 0 { + let fraction_start = into_i32(fraction_start); + exponent.saturating_sub(fraction_start).saturating_sub(1) + } else { + let integer_shift = into_i32(integer_digits - 1); + exponent.saturating_add(integer_shift) + } +} + +// Calculate the mantissa exponent without overflow. +// +// Remove the number of digits that contributed to the mantissa past +// the dot, and add the number of truncated digits from the mantissa, +// to calculate the scaling factor for the mantissa from a raw exponent. +#[inline] +pub(crate) fn mantissa_exponent(exponent: i32, fraction_digits: usize, truncated: usize) -> i32 { + if fraction_digits > truncated { + exponent.saturating_sub(into_i32(fraction_digits - truncated)) + } else { + exponent.saturating_add(into_i32(truncated - fraction_digits)) + } +} diff --git a/vendor/serde_json/src/lexical/float.rs b/vendor/serde_json/src/lexical/float.rs new file mode 100644 index 000000000..2d434a29c --- /dev/null +++ b/vendor/serde_json/src/lexical/float.rs @@ -0,0 +1,183 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +// FLOAT TYPE + +use super::num::*; +use super::rounding::*; +use super::shift::*; + +/// Extended precision floating-point type. +/// +/// Private implementation, exposed only for testing purposes. +#[doc(hidden)] +#[derive(Clone, Copy, Debug, PartialEq, Eq)] +pub(crate) struct ExtendedFloat { + /// Mantissa for the extended-precision float. + pub mant: u64, + /// Binary exponent for the extended-precision float. + pub exp: i32, +} + +impl ExtendedFloat { + // PROPERTIES + + // OPERATIONS + + /// Multiply two normalized extended-precision floats, as if by `a*b`. + /// + /// The precision is maximal when the numbers are normalized, however, + /// decent precision will occur as long as both values have high bits + /// set. The result is not normalized. + /// + /// Algorithm: + /// 1. Non-signed multiplication of mantissas (requires 2x as many bits as input). + /// 2. Normalization of the result (not done here). + /// 3. Addition of exponents. + pub(crate) fn mul(&self, b: &ExtendedFloat) -> ExtendedFloat { + // Logic check, values must be decently normalized prior to multiplication. + debug_assert!((self.mant & u64::HIMASK != 0) && (b.mant & u64::HIMASK != 0)); + + // Extract high-and-low masks. + let ah = self.mant >> u64::HALF; + let al = self.mant & u64::LOMASK; + let bh = b.mant >> u64::HALF; + let bl = b.mant & u64::LOMASK; + + // Get our products + let ah_bl = ah * bl; + let al_bh = al * bh; + let al_bl = al * bl; + let ah_bh = ah * bh; + + let mut tmp = (ah_bl & u64::LOMASK) + (al_bh & u64::LOMASK) + (al_bl >> u64::HALF); + // round up + tmp += 1 << (u64::HALF - 1); + + ExtendedFloat { + mant: ah_bh + (ah_bl >> u64::HALF) + (al_bh >> u64::HALF) + (tmp >> u64::HALF), + exp: self.exp + b.exp + u64::FULL, + } + } + + /// Multiply in-place, as if by `a*b`. + /// + /// The result is not normalized. + #[inline] + pub(crate) fn imul(&mut self, b: &ExtendedFloat) { + *self = self.mul(b); + } + + // NORMALIZE + + /// Normalize float-point number. + /// + /// Shift the mantissa so the number of leading zeros is 0, or the value + /// itself is 0. + /// + /// Get the number of bytes shifted. + #[inline] + pub(crate) fn normalize(&mut self) -> u32 { + // Note: + // Using the cltz intrinsic via leading_zeros is way faster (~10x) + // than shifting 1-bit at a time, via while loop, and also way + // faster (~2x) than an unrolled loop that checks at 32, 16, 4, + // 2, and 1 bit. + // + // Using a modulus of pow2 (which will get optimized to a bitwise + // and with 0x3F or faster) is slightly slower than an if/then, + // however, removing the if/then will likely optimize more branched + // code as it removes conditional logic. + + // Calculate the number of leading zeros, and then zero-out + // any overflowing bits, to avoid shl overflow when self.mant == 0. + let shift = if self.mant == 0 { + 0 + } else { + self.mant.leading_zeros() + }; + shl(self, shift as i32); + shift + } + + // ROUND + + /// Lossy round float-point number to native mantissa boundaries. + #[inline] + pub(crate) fn round_to_native<F, Algorithm>(&mut self, algorithm: Algorithm) + where + F: Float, + Algorithm: FnOnce(&mut ExtendedFloat, i32), + { + round_to_native::<F, _>(self, algorithm); + } + + // FROM + + /// Create extended float from native float. + #[inline] + pub fn from_float<F: Float>(f: F) -> ExtendedFloat { + from_float(f) + } + + // INTO + + /// Convert into default-rounded, lower-precision native float. + #[inline] + pub(crate) fn into_float<F: Float>(mut self) -> F { + self.round_to_native::<F, _>(round_nearest_tie_even); + into_float(self) + } + + /// Convert into downward-rounded, lower-precision native float. + #[inline] + pub(crate) fn into_downward_float<F: Float>(mut self) -> F { + self.round_to_native::<F, _>(round_downward); + into_float(self) + } +} + +// FROM FLOAT + +// Import ExtendedFloat from native float. +#[inline] +pub(crate) fn from_float<F>(f: F) -> ExtendedFloat +where + F: Float, +{ + ExtendedFloat { + mant: u64::as_cast(f.mantissa()), + exp: f.exponent(), + } +} + +// INTO FLOAT + +// Export extended-precision float to native float. +// +// The extended-precision float must be in native float representation, +// with overflow/underflow appropriately handled. +#[inline] +pub(crate) fn into_float<F>(fp: ExtendedFloat) -> F +where + F: Float, +{ + // Export floating-point number. + if fp.mant == 0 || fp.exp < F::DENORMAL_EXPONENT { + // sub-denormal, underflow + F::ZERO + } else if fp.exp >= F::MAX_EXPONENT { + // overflow + F::from_bits(F::INFINITY_BITS) + } else { + // calculate the exp and fraction bits, and return a float from bits. + let exp: u64; + if (fp.exp == F::DENORMAL_EXPONENT) && (fp.mant & F::HIDDEN_BIT_MASK.as_u64()) == 0 { + exp = 0; + } else { + exp = (fp.exp + F::EXPONENT_BIAS) as u64; + } + let exp = exp << F::MANTISSA_SIZE; + let mant = fp.mant & F::MANTISSA_MASK.as_u64(); + F::from_bits(F::Unsigned::as_cast(mant | exp)) + } +} diff --git a/vendor/serde_json/src/lexical/large_powers.rs b/vendor/serde_json/src/lexical/large_powers.rs new file mode 100644 index 000000000..c63ce1cf2 --- /dev/null +++ b/vendor/serde_json/src/lexical/large_powers.rs @@ -0,0 +1,9 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Precalculated large powers for limbs. + +#[cfg(limb_width_32)] +pub(crate) use super::large_powers32::*; + +#[cfg(limb_width_64)] +pub(crate) use super::large_powers64::*; diff --git a/vendor/serde_json/src/lexical/large_powers32.rs b/vendor/serde_json/src/lexical/large_powers32.rs new file mode 100644 index 000000000..799119726 --- /dev/null +++ b/vendor/serde_json/src/lexical/large_powers32.rs @@ -0,0 +1,183 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Precalculated large powers for 32-bit limbs. + +/// Large powers (&[u32]) for base5 operations. +const POW5_1: [u32; 1] = [5]; +const POW5_2: [u32; 1] = [25]; +const POW5_3: [u32; 1] = [625]; +const POW5_4: [u32; 1] = [390625]; +const POW5_5: [u32; 2] = [2264035265, 35]; +const POW5_6: [u32; 3] = [2242703233, 762134875, 1262]; +const POW5_7: [u32; 5] = [3211403009, 1849224548, 3668416493, 3913284084, 1593091]; +const POW5_8: [u32; 10] = [ + 781532673, 64985353, 253049085, 594863151, 3553621484, 3288652808, 3167596762, 2788392729, + 3911132675, 590, +]; +const POW5_9: [u32; 19] = [ + 2553183233, 3201533787, 3638140786, 303378311, 1809731782, 3477761648, 3583367183, 649228654, + 2915460784, 487929380, 1011012442, 1677677582, 3428152256, 1710878487, 1438394610, 2161952759, + 4100910556, 1608314830, 349175, +]; +const POW5_10: [u32; 38] = [ + 4234999809, 2012377703, 2408924892, 1570150255, 3090844311, 3273530073, 1187251475, 2498123591, + 3364452033, 1148564857, 687371067, 2854068671, 1883165473, 505794538, 2988060450, 3159489326, + 2531348317, 3215191468, 849106862, 3892080979, 3288073877, 2242451748, 4183778142, 2995818208, + 2477501924, 325481258, 2487842652, 1774082830, 1933815724, 2962865281, 1168579910, 2724829000, + 2360374019, 2315984659, 2360052375, 3251779801, 1664357844, 28, +]; +const POW5_11: [u32; 75] = [ + 689565697, 4116392818, 1853628763, 516071302, 2568769159, 365238920, 336250165, 1283268122, + 3425490969, 248595470, 2305176814, 2111925499, 507770399, 2681111421, 589114268, 591287751, + 1708941527, 4098957707, 475844916, 3378731398, 2452339615, 2817037361, 2678008327, 1656645978, + 2383430340, 73103988, 448667107, 2329420453, 3124020241, 3625235717, 3208634035, 2412059158, + 2981664444, 4117622508, 838560765, 3069470027, 270153238, 1802868219, 3692709886, 2161737865, + 2159912357, 2585798786, 837488486, 4237238160, 2540319504, 3798629246, 3748148874, 1021550776, + 2386715342, 1973637538, 1823520457, 1146713475, 833971519, 3277251466, 905620390, 26278816, + 2680483154, 2294040859, 373297482, 5996609, 4109575006, 512575049, 917036550, 1942311753, + 2816916778, 3248920332, 1192784020, 3537586671, 2456567643, 2925660628, 759380297, 888447942, + 3559939476, 3654687237, 805, +]; +const POW5_12: [u32; 149] = [ + 322166785, 3809044581, 2994556223, 1239584207, 3962455841, 4001882964, 3053876612, 915114683, + 2783289745, 785739093, 4253185907, 3931164994, 1370983858, 2553556126, 3360742076, 2255410929, + 422849554, 2457422215, 3539495362, 1720790602, 1908931983, 1470596141, 592794347, 4219465164, + 4085652704, 941661409, 2534650953, 885063988, 2355909854, 2812815516, 767256131, 3821757683, + 2155151105, 3817418473, 281116564, 2834395026, 2821201622, 2524625843, 1511330880, 2572352493, + 330571332, 2951088579, 2730271766, 4044456479, 4212286644, 2444937588, 3603420843, 2387148597, + 1142537539, 3299235429, 1751012624, 861228086, 2873722519, 230498814, 1023297821, 2553128038, + 3421129895, 2651917435, 2042981258, 1606787143, 2228751918, 447345732, 1930371132, 1784132011, + 3612538790, 2275925090, 2487567871, 1080427616, 2009179183, 3383506781, 3899054063, 1950782960, + 2168622213, 2717674390, 3616636027, 2079341593, 1530129217, 1461057425, 2406264415, 3674671357, + 2972036238, 2019354295, 1455849819, 1866918619, 1324269294, 424891864, 2722422332, 2641594816, + 1400249021, 3482963993, 3734946379, 225889849, 1891545473, 777383150, 3589824633, 4117601611, + 4220028667, 334453379, 1083130821, 1060342180, 4208163139, 1489826908, 4163762246, 1096580926, + 689301528, 2336054516, 1782865703, 4175148410, 3398369392, 2329412588, 3001580596, 59740741, + 3202189932, 3351895776, 246185302, 718535188, 3772647488, 4151666556, 4055698133, 2461934110, + 2281316281, 3466396836, 3536023465, 1064267812, 2955456354, 2423805422, 3627960790, 1325057500, + 3876919979, 2009959531, 175455101, 184092852, 2358785571, 3842977831, 2485266289, 487121622, + 4159252710, 4075707558, 459389244, 300652075, 2521346588, 3458976673, 888631636, 2076098096, + 3844514585, 2363697580, 3729421522, 3051115477, 649395, +]; +const POW5_13: [u32; 298] = [ + 711442433, 3564261005, 2399042279, 4170849936, 4010295575, 1423987028, 330414929, 1349249065, + 4213813618, 3852031822, 4040843590, 2154565331, 3094013374, 1159028371, 3227065538, 2115927092, + 2085102554, 488590542, 2609619432, 3602898805, 3812736528, 3269439096, 23816114, 253984538, + 1035905997, 2942969204, 3400787671, 338562688, 1637191975, 740509713, 2264962817, 3410753922, + 4162231428, 2282041228, 1759373012, 3155367777, 4278913285, 1420532801, 1981002276, 438054990, + 1006507643, 1142697287, 1332538012, 2029019521, 3949305784, 818392641, 2491288846, 2716584663, + 3648886102, 556814413, 444795339, 4071412999, 1066321706, 4253169466, 2510832316, 672091442, + 4083256000, 2165985028, 1841538484, 3549854235, 364431512, 3707648143, 1162785440, 2268641545, + 281340310, 735693841, 848809228, 1700785200, 2919703985, 4094234344, 58530286, 965505005, + 1000010347, 3381961808, 3040089923, 1973852082, 2890971585, 1019960210, 4292895237, 2821887841, + 3756675650, 3951282907, 3885870583, 1008791145, 503998487, 1881258362, 1949332730, 392996726, + 2012973814, 3970014187, 2461725150, 2942547730, 3728066699, 2766901132, 3778532841, 1085564064, + 2278673896, 1116879805, 3448726271, 774279411, 157211670, 1506320155, 531168605, 1362654525, + 956967721, 2148871960, 769186085, 4186232894, 2055679604, 3248365487, 3981268013, 3975787984, + 2489510517, 3309046495, 212771124, 933418041, 3371839114, 562115198, 1853601831, 757336096, + 1354633440, 1486083256, 2872126393, 522920738, 1141587749, 3210903262, 1926940553, 3054024853, + 2021162538, 2262742000, 1877899947, 3147002868, 669840763, 4158174590, 4238502559, 1023731922, + 3386840011, 829588074, 3449720188, 2835142880, 2999162007, 813056473, 482949569, 638108879, + 3067201471, 1026714238, 4004452838, 2383667807, 3999477803, 771648919, 630660440, 3827121348, + 176185980, 2878191002, 2666149832, 3909811063, 2429163983, 2665690412, 907266128, 4269332098, + 2022665808, 1527122180, 3072053668, 1072477492, 3006022924, 549664855, 2800340954, 37352654, + 1212772743, 2711280533, 3029527946, 2511120040, 1305308377, 3474662224, 4226330922, 442988428, + 954940108, 3274548099, 4212288177, 2688499880, 3982226758, 3922609956, 1279948029, 1939943640, + 3650489901, 2733364929, 2494263275, 1864579964, 1225941120, 2390465139, 1267503249, 3533240729, + 904410805, 2842550015, 2517736241, 1796069820, 3335274381, 673539835, 1924694759, 3598098235, + 2792633405, 16535707, 3703535497, 3592841791, 2929082877, 1317622811, 294990855, 1396706563, + 2383271770, 3853857605, 277813677, 277580220, 1101318484, 3761974115, 1132150143, 2544692622, + 3419825776, 743770306, 1695464553, 1548693232, 2421159615, 2575672031, 2678971806, 1591267897, + 626546738, 3823443129, 267710932, 1455435162, 2353985540, 3248523795, 335348168, 3872552561, + 2814522612, 2634118860, 3503767026, 1301019273, 1414467789, 722985138, 3070909565, 4253482569, + 3744939841, 558142907, 2229819389, 13833173, 77003966, 2763671364, 3905603970, 2931990126, + 2280419384, 1879090457, 2934846267, 4284933164, 2331863845, 62191163, 3178861020, 1522063815, + 785672270, 1215568492, 2936443917, 802972489, 2956820173, 3916732783, 2893572089, 1391232801, + 3168640330, 2396859648, 894950918, 1103583736, 961991865, 2807302642, 305977505, 3054505899, + 1048256994, 781017659, 2459278754, 3164823415, 537658277, 905753687, 464963300, 4149131560, + 1029507924, 2278300961, 1231291503, 414073408, 3630740085, 2345841814, 475358196, 3258243317, + 4167625072, 4178911231, 2927355042, 655438830, 3138378018, 623200562, 2785714112, 273403236, + 807993669, 98, +]; +const POW5_14: [u32; 595] = [ + 1691320321, 2671006246, 1682531301, 2072858707, 1240508969, 3108358191, 1125119096, 2470144952, + 1610099978, 1690632660, 1941696884, 2663506355, 1006364675, 3909158537, 4147711374, 1072663936, + 4078768933, 745751659, 4123687570, 471458681, 655028926, 4113407388, 3945524552, 985625313, + 1254424514, 2127508744, 570530434, 945388122, 3194649404, 2589065070, 2731705399, 202030749, + 2090780394, 3348662271, 1481754777, 1130635472, 4025144705, 1924486271, 2578567861, 125491448, + 1558036315, 994248173, 3817216711, 763950077, 1030439870, 959586474, 3845661701, 483795093, + 1637944470, 2275463649, 3398804829, 1758016486, 2665513698, 2004912571, 1094885097, 4223064276, + 3307819021, 651121777, 1757003305, 3603542336, 129917786, 2215974994, 3042386306, 2205352757, + 3944939700, 3710987569, 97967515, 1217242524, 930630949, 3660328512, 1787663098, 1784141600, + 2500542892, 4034561586, 3444961378, 785043562, 3869499367, 885623728, 2625011087, 3053789617, + 1965731793, 3900511934, 2648823592, 3851062028, 3321968688, 799195417, 1011847510, 1369129160, + 1348009103, 2876796955, 2915408967, 3305284948, 263399535, 1715990604, 2645821294, 1587844552, + 2624912049, 3035631499, 2306636348, 3499275462, 675152704, 854794152, 4004972748, 1739996642, + 1333476491, 4012621867, 3658792931, 3297985728, 2864481726, 3066357406, 785287846, 1671499798, + 433044045, 1919608025, 264833858, 3999983367, 1116778570, 1301982149, 4213901070, 4081649357, + 536169226, 1389008649, 188923873, 373495152, 2551132278, 1800758715, 3951840330, 2632334454, + 3118778225, 1034046547, 1862428410, 3037609062, 1994608505, 29051798, 2571685694, 264151332, + 2260643090, 2717535964, 3508441116, 3283713017, 1903365635, 923575694, 1219598101, 2288281570, + 3676533911, 1014136356, 555142354, 2389170030, 4185108175, 884862419, 836141292, 2957159173, + 1997444768, 4233903127, 2876184692, 3089125070, 1480848293, 1097600237, 299700527, 2507669891, + 2982628312, 2114881043, 2529576251, 2812279824, 2987750993, 4241938954, 2204775591, 1037094060, + 829315638, 1231047149, 52608178, 3735136637, 3455232602, 962039123, 488286513, 50685385, + 3516451821, 843975207, 1572355722, 675489076, 2428445672, 1555117248, 3708476086, 10375249, + 4172112346, 2117510871, 2227658327, 3187664554, 3050656558, 328034318, 3179601324, 1247769761, + 3439263953, 1431538938, 2962525068, 1213366289, 3813013550, 2651093719, 1860661503, 3933716208, + 264320617, 789980519, 2257856172, 102000748, 977269860, 1113845122, 3008928583, 1461738106, + 557786285, 2926560363, 1038106190, 3643478847, 828004507, 457818698, 1933056971, 373408056, + 2076808229, 3160935130, 2781854874, 2519636100, 177606000, 4237103862, 3977834316, 1621936232, + 2599050516, 319893558, 3343370366, 765044144, 976657331, 7026264, 294277429, 3829376742, + 3029627280, 2705178718, 3614653880, 230519152, 3288033233, 293525479, 3805751881, 3227511198, + 2520308544, 3648103003, 1111086184, 437622105, 2232033852, 3239146386, 584244184, 1450926016, + 2462430443, 3226534010, 298582169, 4214576928, 1762099469, 964985185, 1585788148, 1641127666, + 787006566, 2315956284, 3258232694, 2275058964, 2541003317, 1508235863, 2613339827, 4080647514, + 1152057965, 3149266279, 731345410, 914737650, 65395712, 1884566942, 1379520432, 2611027720, + 4163073378, 2619704967, 2746552541, 1388822415, 3005141199, 843440249, 4288674003, 3136174279, + 4051522914, 4144149433, 3427566947, 3419023197, 3758479825, 3893877676, 96899594, 1657725776, + 253618880, 434129337, 1499045748, 2996992534, 4036042074, 2110713869, 906222950, 928326225, + 2541827893, 1604330202, 226792470, 4022228930, 815850898, 1466012310, 3377712199, 292769859, + 2822055597, 3225701344, 3052947004, 385831222, 705324593, 4030158636, 3540280538, 2982120874, + 2136414455, 255762046, 3852783591, 3262064164, 2358991588, 3756586117, 4143612643, 3326743817, + 2897365738, 807711264, 3719310016, 3721264861, 3627337076, 944539331, 3640975513, 3712525681, + 1162911839, 2008243316, 2179489649, 2867584109, 261861553, 3570253908, 2062868357, 2220328623, + 3857004679, 3744109002, 4138041873, 1451860932, 2364975637, 2802161722, 2680106834, 753401584, + 1223182946, 1245401957, 4163377735, 3565815922, 2216942838, 4036140094, 71979081, 3924559643, + 400477238, 551750683, 1174153235, 859969898, 1185921017, 1711399735, 812991545, 4051735761, + 3549118738, 1631653329, 3631835958, 3648867800, 1206500363, 2155893137, 361030362, 3454286017, + 2505909489, 1083595169, 453595313, 1510564703, 1706163902, 1632924345, 1381875722, 1661526119, + 1082778324, 3571910052, 1140625929, 851544870, 1145546234, 2938573139, 907528924, 1304752338, + 1764668294, 1788942063, 1700368828, 104979467, 1413911959, 3327497828, 1956384744, 1272712474, + 2815637534, 3307809377, 1320574940, 1111968962, 4073107827, 434096622, 169451929, 3201183459, + 3331028877, 2852366972, 3369830128, 2924794558, 3106537952, 3739481231, 1612955817, 4138608722, + 2721281595, 2755775390, 843505117, 982234295, 1157276611, 814674632, 4246504726, 3532006708, + 992340967, 1647538031, 204696133, 193866982, 3899126129, 300851698, 1379496684, 1759463683, + 1354782756, 1374637239, 3410883240, 1073406229, 3038431791, 1053909855, 3607043270, 173719711, + 3733903830, 171820911, 1573050589, 932781534, 4183534770, 2158849555, 372245998, 3573073830, + 841339264, 2759200520, 1610547277, 2603293319, 3890906486, 1557138278, 3964109906, 677238797, + 537994297, 1124184993, 4287078344, 4207654540, 2943022776, 2977947524, 3255359985, 4098397558, + 2274666217, 2915862060, 243524940, 2467726756, 2869020032, 507521339, 3403121914, 522051455, + 1803903108, 3471254194, 473535371, 1948602036, 3352095732, 3116527002, 1795743673, 775867940, + 2551469548, 3757442064, 3162525227, 3765412747, 3040105484, 1927625810, 48214767, 2997207130, + 1342349989, 2536583992, 1501320191, 3592287317, 887432730, 967585477, 3334212779, 948663609, + 1064513472, 15386372, 2465931737, 3230242590, 3036652803, 2063155087, 1927500726, 2821790499, + 2187774383, 501520074, 3688568496, 3606711121, 2576459247, 3176542345, 378322447, 156541411, + 1400607301, 1406179107, 677848877, 2253753529, 193196070, 4207435024, 4166396241, 509467541, + 2906024136, 1221753746, 3375413222, 431327897, 2749265123, 2848827671, 3412997614, 2051920238, + 1283516885, 1300498239, 1957256104, 2634010560, 3531900395, 360276850, 1461184973, 2012063967, + 2873572430, 2914608609, 4289554777, 1539331673, 1859532928, 4213441063, 538215691, 3512720863, + 4258743698, 3040408445, 982396546, 343095663, 4138069496, 1021581857, 214185242, 1968079460, + 2864275059, 3347192726, 4096783459, 3259169450, 3707808869, 142485006, 399610869, 230556456, + 2219467721, 4191227798, 2242548189, 3136366572, 179755707, 3464881829, 452317775, 3887426070, + 3446430233, 1473370015, 1576807208, 3964523248, 419325089, 2373067114, 1596072055, 1928415752, + 3635452689, 1005598891, 3335462724, 3290848636, 3669078247, 1178176812, 2110774376, 3068593619, + 1253036518, 908857731, 3631223047, 4138506423, 2903592318, 3596915748, 3289036113, 3721512676, + 2704409359, 3386016968, 3676268074, 2185259502, 1096257611, 3360076717, 3548676554, 170167319, + 3360064287, 3899940843, 9640, +]; + +pub(crate) const POW5: [&'static [u32]; 14] = [ + &POW5_1, &POW5_2, &POW5_3, &POW5_4, &POW5_5, &POW5_6, &POW5_7, &POW5_8, &POW5_9, &POW5_10, + &POW5_11, &POW5_12, &POW5_13, &POW5_14, +]; diff --git a/vendor/serde_json/src/lexical/large_powers64.rs b/vendor/serde_json/src/lexical/large_powers64.rs new file mode 100644 index 000000000..ee3656108 --- /dev/null +++ b/vendor/serde_json/src/lexical/large_powers64.rs @@ -0,0 +1,625 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Precalculated large powers for 64-bit limbs. + +/// Large powers (&[u64]) for base5 operations. +const POW5_1: [u64; 1] = [5]; +const POW5_2: [u64; 1] = [25]; +const POW5_3: [u64; 1] = [625]; +const POW5_4: [u64; 1] = [390625]; +const POW5_5: [u64; 1] = [152587890625]; +const POW5_6: [u64; 2] = [3273344365508751233, 1262]; +const POW5_7: [u64; 3] = [7942358959831785217, 16807427164405733357, 1593091]; +const POW5_8: [u64; 5] = [ + 279109966635548161, + 2554917779393558781, + 14124656261812188652, + 11976055582626787546, + 2537941837315, +]; +const POW5_9: [u64; 10] = [ + 13750482914757213185, + 1302999927698857842, + 14936872543252795590, + 2788415840139466767, + 2095640732773017264, + 7205570348933370714, + 7348167152523113408, + 9285516396840364274, + 6907659600622710236, + 349175, +]; +const POW5_10: [u64; 19] = [ + 8643096425819600897, + 6743743997439985372, + 14059704609098336919, + 10729359125898331411, + 4933048501514368705, + 12258131603170554683, + 2172371001088594721, + 13569903330219142946, + 13809142207969578845, + 16716360519037769646, + 9631256923806107285, + 12866941232305103710, + 1397931361048440292, + 7619627737732970332, + 12725409486282665900, + 11703051443360963910, + 9947078370803086083, + 13966287901448440471, + 121923442132, +]; +const POW5_11: [u64; 38] = [ + 17679772531488845825, + 2216509366347768155, + 1568689219195129479, + 5511594616325588277, + 1067709417009240089, + 9070650952098657518, + 11515285870634858015, + 2539561553659505564, + 17604889300961091799, + 14511540856854204724, + 12099083339557485471, + 7115240299237943815, + 313979240050606788, + 10004784664717172195, + 15570268847930131473, + 10359715202835930803, + 17685054012115162812, + 13183273382855797757, + 7743260039872919062, + 9284593436392572926, + 11105921222066415013, + 18198799323400703846, + 16314988383739458320, + 4387527177871570570, + 8476708682254672590, + 4925096874831034057, + 14075687868072027455, + 112866656203221926, + 9852830467773230418, + 25755239915196746, + 2201493076310172510, + 8342165458688466438, + 13954006576066379050, + 15193819059903295636, + 12565616718911389531, + 3815854855847885129, + 15696762163583540628, + 805, +]; +const POW5_12: [u64; 75] = [ + 16359721904723189761, + 5323973632697650495, + 17187956456762001185, + 3930387638628283780, + 3374723710406992273, + 16884225088663222131, + 10967440051041439154, + 9686916182456720060, + 10554548046311730194, + 7390739362393647554, + 6316162333127736719, + 18122464886584070891, + 4044404959645932768, + 3801320885861987401, + 12080950653257274590, + 16414324262488991299, + 16395687498836410113, + 12173633940896186260, + 10843185433142632150, + 11048169832730399808, + 12674828934734683716, + 17370808310130582550, + 10500926985433408692, + 10252725158410704555, + 14170108270502067523, + 3698946465517688080, + 989984870770509463, + 10965601426733943069, + 11389898658438335655, + 6901098232861256586, + 1921335291173932590, + 7662788640922083388, + 9775023833308395430, + 4640401278902814207, + 14532050972198413359, + 8378549018693130223, + 11672322628395371653, + 8930704142764178555, + 6275193859483102017, + 15782593304269205087, + 8673060659034172558, + 8018354414354334043, + 1824896661540749038, + 11345563346725559868, + 14959216444480821949, + 970189517688324683, + 3338835207603007873, + 17684964260791738489, + 1436466329061721851, + 4554134986752476101, + 6398757850768963907, + 4709779218751158342, + 10033277748582410264, + 17932125878679265063, + 10004750887749091440, + 256584531835386932, + 14396282740722731628, + 3086085133731396950, + 17831272085689600064, + 10573926491412564693, + 14888061047859191737, + 4570995450261499817, + 10410165022312935266, + 5691078631447480790, + 8632710455805418155, + 790672778942823293, + 16505464105756800547, + 2092171438149740401, + 17505030673829275878, + 1291290830058928444, + 14856191690683232796, + 8916773426496500052, + 10152003807578858265, + 13104441193763861714, + 649395, +]; +const POW5_13: [u64; 149] = [ + 15308384451594534913, + 17913664074042735335, + 6115977719198531863, + 5794980608663993169, + 16544350702855106930, + 9253787637781258566, + 4977988951675168190, + 9087837664087448770, + 2098480401110016986, + 15474332540882100712, + 14042133997396540944, + 1090855284423485362, + 12639956485351058381, + 1454115676006639319, + 3180465001342538023, + 14649076551958697729, + 9801292446545910916, + 13552201410826594004, + 6101141927469189381, + 1881431857880609316, + 4907847477899433595, + 8714572486973123228, + 3514969632331374520, + 11667642286891470094, + 2391499697425323350, + 17486585679659076043, + 18267223761882105642, + 2886610765822313148, + 9302834862968900288, + 15246507846733637044, + 15924227519624562840, + 9743741243284697760, + 3159780987244964246, + 7304816812369628428, + 17584602612559717809, + 4146812420657846766, + 14525415362681041515, + 8477630142371600195, + 4380695748062263745, + 12119915994367943173, + 16970630866565485122, + 4332724980155264503, + 8079943140620527639, + 1687908087554405626, + 17051081099834002166, + 12638146269730763230, + 11883749876933445771, + 4662462156371383785, + 4796962238316531176, + 3325504751659868927, + 6469595803187862550, + 5852556621152583005, + 9229334792448387881, + 17979733373938620709, + 13951623534175792756, + 17075879371091039277, + 14212246479457938037, + 4008999959804158260, + 2414266395366403722, + 3252733766253918247, + 6382678985007829216, + 2245927470982310841, + 13790724502051307301, + 13116936866733148041, + 9718402891306794538, + 13516274400356104875, + 17859223875778049403, + 4396895129099725471, + 3563053650368467915, + 12176845952536972668, + 3492050964335269015, + 2740656767075170753, + 4409704077614761919, + 10237775279597492710, + 3314206875098230827, + 16437361028114095448, + 12361736225407656572, + 16792510651790145480, + 11449053143229929935, + 18336641737580333136, + 6558939822118891088, + 4606255756908155300, + 2360792578991605004, + 160428430149144538, + 11644861220729221511, + 10785178451159739786, + 14923560618031934681, + 1902620814992781610, + 14064076995338910412, + 11547019064112212657, + 16847481479966225734, + 8331994491163145469, + 11739712981738851885, + 8008309968651120619, + 10266969595459035264, + 15175153381217702033, + 12208659352573720245, + 7714061140750342961, + 2892831567213510541, + 15453714249045017319, + 71020323573871677, + 15431137995750602633, + 5659146884637671933, + 5998809010488554503, + 16552192379299157850, + 1192197967194298797, + 16157555793424861524, + 10929371590994640255, + 3194469143425738352, + 6651586784672005225, + 11062427140788057791, + 6834443579468668318, + 16421563197797455922, + 6251046422506172884, + 13952303462156793860, + 16632486601871393224, + 11313454360291325172, + 5587835232504462834, + 3105197524618514637, + 18268568531031972989, + 2397205535804309313, + 59413027864729597, + 11869878125348715710, + 12592801707270523266, + 8070632061321113656, + 18403647807860650811, + 267109013517069093, + 6537214311028855260, + 5220826919973709902, + 3448740582779163661, + 16822239213112884941, + 5975299384311048185, + 10294433804430712138, + 4739856055412448774, + 12057273038326387897, + 13119002941950056609, + 3354445304051737058, + 13592813067499314594, + 3890182464434078629, + 17820384357466425060, + 9785228118969879380, + 1778431746734556271, + 10075313876350055029, + 13994048489400919028, + 17948287074199726448, + 2815088342305858722, + 2676626035777198370, + 1174257960026283968, + 421714788677, +]; +const POW5_14: [u64; 298] = [ + 11471884475673051137, + 8902860357476377573, + 13350296775839230505, + 10609191786344608888, + 7261211985859587338, + 11439672689354862964, + 16789708072300570627, + 4607056528866348430, + 3202978990421512997, + 2024899620433984146, + 17666950207239811774, + 4233228489390288200, + 9137580478688460738, + 4060411066587388546, + 11119949806060600124, + 867715462473090103, + 14382394941384869610, + 4856042377419278489, + 8265605599571137921, + 538981667666252469, + 4270263388700786523, + 3281140600308898503, + 4121392524544394174, + 2077884106245940229, + 9773041957329767574, + 7550623316597646685, + 8611033926449791714, + 18137922955420802793, + 2796546741236224013, + 15477096484628446761, + 9517540128113714010, + 9471917970500821378, + 15938570248662483124, + 5228016831978462619, + 15720991252586974501, + 7662829825220776698, + 17328310068068434348, + 3371736428170309730, + 3803724952191098855, + 13115926536504376719, + 16752571196153442257, + 16540185467776259880, + 3432518182450051120, + 5880364967211798870, + 12355748840305392783, + 14196090758536469575, + 7370123524686686319, + 6819740424617592686, + 13037938013537368753, + 15029273671291927100, + 3671312928327205696, + 7473228676544792780, + 17234079691312938123, + 14164740848093544419, + 13169904779481875902, + 7179036968465894054, + 8244653688947194445, + 17179797746073799490, + 5591970751047577674, + 17530550506268329742, + 5965746721852312330, + 1604149463243472865, + 7734199791463116918, + 11305790396015856714, + 4441196105025505137, + 13046431581185664762, + 124776524294606713, + 1134521334706523966, + 11671728093344476434, + 14103440020972933148, + 3966727403013869059, + 9828094508409132821, + 4355682486381147287, + 10261407143988481234, + 3800455155249557199, + 12700901937937547500, + 18184475466894579360, + 13267691151779895412, + 4714157123477697445, + 10770360171308585263, + 9083344917597998040, + 12078649873810212155, + 18218989082046199377, + 4454285072780637351, + 5287307245618354742, + 16042289702059031730, + 4131926574212754010, + 217692071448455473, + 3624845916216282093, + 2901203491797614218, + 6679177724033967080, + 44561358851332790, + 9094639944041587162, + 13690915012276084311, + 1408896670826320686, + 5359130319612337580, + 6148412925099835601, + 5211368532286409612, + 11386360825549027374, + 16895182466965795071, + 3392940493846427241, + 438089879085393580, + 4783928372776399972, + 6278117363595909959, + 12569481049412674733, + 15648622492570893902, + 1966316336235305115, + 1603775390515993547, + 13576113010204316709, + 10821754650102840474, + 18198222517222903152, + 6966163076615302988, + 1373932372410129684, + 3285839581819684990, + 30177575069719475, + 16447047871247307061, + 11618654126674833808, + 990072222556306872, + 1260682336135768017, + 13862055046689532489, + 15668483092844698432, + 1879572630092764264, + 13912027797058626108, + 6231679788219816920, + 13857858054844167403, + 18101470072534728857, + 4144579812461609229, + 7048589655616599284, + 9946956499532694630, + 9771303850109874038, + 6477823708780339765, + 17526247621747041971, + 13525995675852669549, + 3928768291901239810, + 8094153383078124544, + 11214278667728965552, + 11251547162596832610, + 5964946855123292381, + 3622548288590237903, + 13469765967150053587, + 17798986288523466082, + 14684592818807932259, + 16724077276802963921, + 7119877993753121290, + 1864571304902781632, + 12871984921385213812, + 9065447042604670298, + 3987130777300360550, + 6890545752116901685, + 17275341711601865750, + 6296474927799264658, + 1257436973037243463, + 13854281781965301421, + 1657132483318662716, + 17309399540017292849, + 12808111630089217242, + 1098489625264462071, + 14010458905686364135, + 16134414519481621220, + 14288255900328821475, + 3469093466388187882, + 15982710881468295872, + 4056765540058056052, + 15945176389096104089, + 8625339365793505375, + 12316179968863788913, + 15334123773538054321, + 9536238824220581765, + 16080825720106203271, + 6235695225418121745, + 12035192956458019349, + 3235835166714703698, + 5348960676912581218, + 15315062772709464647, + 17335089708021308662, + 16855855317958414409, + 2369751139431140406, + 3693542588628609043, + 7350405893393987577, + 17402072586341663801, + 7007897690013647122, + 15671767872059304758, + 9259490518292347915, + 14836045474406130394, + 4654005815464502513, + 6487825998330548401, + 7013356660323385022, + 7136200343936679946, + 15341236858676437716, + 3657357368867197449, + 12621075530054608378, + 5603868621997066972, + 7683447656788439942, + 450883379216880060, + 14291494350184945047, + 5466258454997635048, + 14206933098432772126, + 4775870327277641692, + 1864430798867181939, + 13748978265070608793, + 12250822864261576589, + 12561896977498605296, + 16060949594257359328, + 17775189113543311529, + 11835965177892927035, + 4218664174878121437, + 3499000902478111683, + 15169853304359126294, + 7076121963053575143, + 832652347668916805, + 1292148207755194737, + 7556838978364207852, + 5904021986723518500, + 4610244652288570024, + 4526508363195533871, + 746120481022614726, + 737965197247830486, + 4006266184415762653, + 9272188239892688050, + 15346235246415709678, + 11850675997347533184, + 11181059668610842701, + 6687857983250662774, + 2908718488661492818, + 4828337780126983225, + 18071738646453002184, + 12790187227727197880, + 17602483480871623153, + 12523532189621855977, + 10598805712727696716, + 2179787555896149376, + 2242193929457337594, + 14908923241136742532, + 8369182018012550027, + 13385381554043022324, + 3332327430110633913, + 16138090784046208492, + 16172324607469047339, + 8279089815915615244, + 12872906602736235247, + 10894545290539475621, + 15428756545851905023, + 4155747980686992922, + 4074479178894544043, + 66083965608603584, + 13873786284662268377, + 8861183628277687555, + 12119497911296021430, + 2154012318305274287, + 15490706314503067312, + 13643145488710608367, + 672340241093017103, + 6039493278284091973, + 9679797700977436461, + 18070795828318171174, + 2188146431134935377, + 5247392385741514952, + 1852539214842869734, + 12235621681634112739, + 8812930319623534062, + 5585597406294108629, + 11312989214475901864, + 1547377291787797995, + 8641748937186208205, + 12518148659168623694, + 6611379197521520985, + 18096591571068008576, + 15087021227100112139, + 13058454842015958418, + 1473584652966833794, + 4387660670140018168, + 8452836916843525402, + 14376083294443363955, + 13998026203969090659, + 611968444648172645, + 990232438801273845, + 18001186324715561929, + 13470591857250177501, + 14881554140239420091, + 16696367836720124495, + 6328076032778459673, + 17027497695968504616, + 10192245646262428833, + 8282482589527318647, + 4319014353374321425, + 14134087271041670980, + 5060230880114618599, + 13179509240430058600, + 3903514232614801894, + 17774749744702165255, + 15448635507030969726, + 15983775238358480209, + 14542832143965487887, + 9385618098039514666, + 14431419612662304843, + 730863073501675978, + 16750118380379734815, + 9640, +]; + +pub(crate) const POW5: [&[u64]; 14] = [ + &POW5_1, &POW5_2, &POW5_3, &POW5_4, &POW5_5, &POW5_6, &POW5_7, &POW5_8, &POW5_9, &POW5_10, + &POW5_11, &POW5_12, &POW5_13, &POW5_14, +]; diff --git a/vendor/serde_json/src/lexical/math.rs b/vendor/serde_json/src/lexical/math.rs new file mode 100644 index 000000000..37cc1d24a --- /dev/null +++ b/vendor/serde_json/src/lexical/math.rs @@ -0,0 +1,886 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Building-blocks for arbitrary-precision math. +//! +//! These algorithms assume little-endian order for the large integer +//! buffers, so for a `vec![0, 1, 2, 3]`, `3` is the most significant limb, +//! and `0` is the least significant limb. + +use super::large_powers; +use super::num::*; +use super::small_powers::*; +use alloc::vec::Vec; +use core::{cmp, iter, mem}; + +// ALIASES +// ------- + +// Type for a single limb of the big integer. +// +// A limb is analogous to a digit in base10, except, it stores 32-bit +// or 64-bit numbers instead. +// +// This should be all-known 64-bit platforms supported by Rust. +// https://forge.rust-lang.org/platform-support.html +// +// Platforms where native 128-bit multiplication is explicitly supported: +// - x86_64 (Supported via `MUL`). +// - mips64 (Supported via `DMULTU`, which `HI` and `LO` can be read-from). +// +// Platforms where native 64-bit multiplication is supported and +// you can extract hi-lo for 64-bit multiplications. +// aarch64 (Requires `UMULH` and `MUL` to capture high and low bits). +// powerpc64 (Requires `MULHDU` and `MULLD` to capture high and low bits). +// +// Platforms where native 128-bit multiplication is not supported, +// requiring software emulation. +// sparc64 (`UMUL` only supported double-word arguments). + +// 32-BIT LIMB +#[cfg(limb_width_32)] +pub type Limb = u32; + +#[cfg(limb_width_32)] +pub const POW5_LIMB: &[Limb] = &POW5_32; + +#[cfg(limb_width_32)] +pub const POW10_LIMB: &[Limb] = &POW10_32; + +#[cfg(limb_width_32)] +type Wide = u64; + +// 64-BIT LIMB +#[cfg(limb_width_64)] +pub type Limb = u64; + +#[cfg(limb_width_64)] +pub const POW5_LIMB: &[Limb] = &POW5_64; + +#[cfg(limb_width_64)] +pub const POW10_LIMB: &[Limb] = &POW10_64; + +#[cfg(limb_width_64)] +type Wide = u128; + +/// Cast to limb type. +#[inline] +pub(crate) fn as_limb<T: Integer>(t: T) -> Limb { + Limb::as_cast(t) +} + +/// Cast to wide type. +#[inline] +fn as_wide<T: Integer>(t: T) -> Wide { + Wide::as_cast(t) +} + +// SPLIT +// ----- + +/// Split u64 into limbs, in little-endian order. +#[inline] +#[cfg(limb_width_32)] +fn split_u64(x: u64) -> [Limb; 2] { + [as_limb(x), as_limb(x >> 32)] +} + +/// Split u64 into limbs, in little-endian order. +#[inline] +#[cfg(limb_width_64)] +fn split_u64(x: u64) -> [Limb; 1] { + [as_limb(x)] +} + +// HI64 +// ---- + +// NONZERO + +/// Check if any of the remaining bits are non-zero. +#[inline] +pub fn nonzero<T: Integer>(x: &[T], rindex: usize) -> bool { + let len = x.len(); + let slc = &x[..len - rindex]; + slc.iter().rev().any(|&x| x != T::ZERO) +} + +/// Shift 64-bit integer to high 64-bits. +#[inline] +fn u64_to_hi64_1(r0: u64) -> (u64, bool) { + debug_assert!(r0 != 0); + let ls = r0.leading_zeros(); + (r0 << ls, false) +} + +/// Shift 2 64-bit integers to high 64-bits. +#[inline] +fn u64_to_hi64_2(r0: u64, r1: u64) -> (u64, bool) { + debug_assert!(r0 != 0); + let ls = r0.leading_zeros(); + let rs = 64 - ls; + let v = match ls { + 0 => r0, + _ => (r0 << ls) | (r1 >> rs), + }; + let n = r1 << ls != 0; + (v, n) +} + +/// Trait to export the high 64-bits from a little-endian slice. +trait Hi64<T>: AsRef<[T]> { + /// Get the hi64 bits from a 1-limb slice. + fn hi64_1(&self) -> (u64, bool); + + /// Get the hi64 bits from a 2-limb slice. + fn hi64_2(&self) -> (u64, bool); + + /// Get the hi64 bits from a 3-limb slice. + fn hi64_3(&self) -> (u64, bool); + + /// High-level exporter to extract the high 64 bits from a little-endian slice. + #[inline] + fn hi64(&self) -> (u64, bool) { + match self.as_ref().len() { + 0 => (0, false), + 1 => self.hi64_1(), + 2 => self.hi64_2(), + _ => self.hi64_3(), + } + } +} + +impl Hi64<u32> for [u32] { + #[inline] + fn hi64_1(&self) -> (u64, bool) { + debug_assert!(self.len() == 1); + let r0 = self[0] as u64; + u64_to_hi64_1(r0) + } + + #[inline] + fn hi64_2(&self) -> (u64, bool) { + debug_assert!(self.len() == 2); + let r0 = (self[1] as u64) << 32; + let r1 = self[0] as u64; + u64_to_hi64_1(r0 | r1) + } + + #[inline] + fn hi64_3(&self) -> (u64, bool) { + debug_assert!(self.len() >= 3); + let r0 = self[self.len() - 1] as u64; + let r1 = (self[self.len() - 2] as u64) << 32; + let r2 = self[self.len() - 3] as u64; + let (v, n) = u64_to_hi64_2(r0, r1 | r2); + (v, n || nonzero(self, 3)) + } +} + +impl Hi64<u64> for [u64] { + #[inline] + fn hi64_1(&self) -> (u64, bool) { + debug_assert!(self.len() == 1); + let r0 = self[0]; + u64_to_hi64_1(r0) + } + + #[inline] + fn hi64_2(&self) -> (u64, bool) { + debug_assert!(self.len() >= 2); + let r0 = self[self.len() - 1]; + let r1 = self[self.len() - 2]; + let (v, n) = u64_to_hi64_2(r0, r1); + (v, n || nonzero(self, 2)) + } + + #[inline] + fn hi64_3(&self) -> (u64, bool) { + self.hi64_2() + } +} + +// SCALAR +// ------ + +// Scalar-to-scalar operations, for building-blocks for arbitrary-precision +// operations. + +mod scalar { + use super::*; + + // ADDITION + + /// Add two small integers and return the resulting value and if overflow happens. + #[inline] + pub fn add(x: Limb, y: Limb) -> (Limb, bool) { + x.overflowing_add(y) + } + + /// AddAssign two small integers and return if overflow happens. + #[inline] + pub fn iadd(x: &mut Limb, y: Limb) -> bool { + let t = add(*x, y); + *x = t.0; + t.1 + } + + // SUBTRACTION + + /// Subtract two small integers and return the resulting value and if overflow happens. + #[inline] + pub fn sub(x: Limb, y: Limb) -> (Limb, bool) { + x.overflowing_sub(y) + } + + /// SubAssign two small integers and return if overflow happens. + #[inline] + pub fn isub(x: &mut Limb, y: Limb) -> bool { + let t = sub(*x, y); + *x = t.0; + t.1 + } + + // MULTIPLICATION + + /// Multiply two small integers (with carry) (and return the overflow contribution). + /// + /// Returns the (low, high) components. + #[inline] + pub fn mul(x: Limb, y: Limb, carry: Limb) -> (Limb, Limb) { + // Cannot overflow, as long as wide is 2x as wide. This is because + // the following is always true: + // `Wide::max_value() - (Narrow::max_value() * Narrow::max_value()) >= Narrow::max_value()` + let z: Wide = as_wide(x) * as_wide(y) + as_wide(carry); + let bits = mem::size_of::<Limb>() * 8; + (as_limb(z), as_limb(z >> bits)) + } + + /// Multiply two small integers (with carry) (and return if overflow happens). + #[inline] + pub fn imul(x: &mut Limb, y: Limb, carry: Limb) -> Limb { + let t = mul(*x, y, carry); + *x = t.0; + t.1 + } +} // scalar + +// SMALL +// ----- + +// Large-to-small operations, to modify a big integer from a native scalar. + +mod small { + use super::*; + + // MULTIPLICATIION + + /// ADDITION + + /// Implied AddAssign implementation for adding a small integer to bigint. + /// + /// Allows us to choose a start-index in x to store, to allow incrementing + /// from a non-zero start. + #[inline] + pub fn iadd_impl(x: &mut Vec<Limb>, y: Limb, xstart: usize) { + if x.len() <= xstart { + x.push(y); + } else { + // Initial add + let mut carry = scalar::iadd(&mut x[xstart], y); + + // Increment until overflow stops occurring. + let mut size = xstart + 1; + while carry && size < x.len() { + carry = scalar::iadd(&mut x[size], 1); + size += 1; + } + + // If we overflowed the buffer entirely, need to add 1 to the end + // of the buffer. + if carry { + x.push(1); + } + } + } + + /// AddAssign small integer to bigint. + #[inline] + pub fn iadd(x: &mut Vec<Limb>, y: Limb) { + iadd_impl(x, y, 0); + } + + // SUBTRACTION + + /// SubAssign small integer to bigint. + /// Does not do overflowing subtraction. + #[inline] + pub fn isub_impl(x: &mut Vec<Limb>, y: Limb, xstart: usize) { + debug_assert!(x.len() > xstart && (x[xstart] >= y || x.len() > xstart + 1)); + + // Initial subtraction + let mut carry = scalar::isub(&mut x[xstart], y); + + // Increment until overflow stops occurring. + let mut size = xstart + 1; + while carry && size < x.len() { + carry = scalar::isub(&mut x[size], 1); + size += 1; + } + normalize(x); + } + + // MULTIPLICATION + + /// MulAssign small integer to bigint. + #[inline] + pub fn imul(x: &mut Vec<Limb>, y: Limb) { + // Multiply iteratively over all elements, adding the carry each time. + let mut carry: Limb = 0; + for xi in x.iter_mut() { + carry = scalar::imul(xi, y, carry); + } + + // Overflow of value, add to end. + if carry != 0 { + x.push(carry); + } + } + + /// Mul small integer to bigint. + #[inline] + pub fn mul(x: &[Limb], y: Limb) -> Vec<Limb> { + let mut z = Vec::<Limb>::default(); + z.extend_from_slice(x); + imul(&mut z, y); + z + } + + /// MulAssign by a power. + /// + /// Theoretically... + /// + /// Use an exponentiation by squaring method, since it reduces the time + /// complexity of the multiplication to ~`O(log(n))` for the squaring, + /// and `O(n*m)` for the result. Since `m` is typically a lower-order + /// factor, this significantly reduces the number of multiplications + /// we need to do. Iteratively multiplying by small powers follows + /// the nth triangular number series, which scales as `O(p^2)`, but + /// where `p` is `n+m`. In short, it scales very poorly. + /// + /// Practically.... + /// + /// Exponentiation by Squaring: + /// running 2 tests + /// test bigcomp_f32_lexical ... bench: 1,018 ns/iter (+/- 78) + /// test bigcomp_f64_lexical ... bench: 3,639 ns/iter (+/- 1,007) + /// + /// Exponentiation by Iterative Small Powers: + /// running 2 tests + /// test bigcomp_f32_lexical ... bench: 518 ns/iter (+/- 31) + /// test bigcomp_f64_lexical ... bench: 583 ns/iter (+/- 47) + /// + /// Exponentiation by Iterative Large Powers (of 2): + /// running 2 tests + /// test bigcomp_f32_lexical ... bench: 671 ns/iter (+/- 31) + /// test bigcomp_f64_lexical ... bench: 1,394 ns/iter (+/- 47) + /// + /// Even using worst-case scenarios, exponentiation by squaring is + /// significantly slower for our workloads. Just multiply by small powers, + /// in simple cases, and use precalculated large powers in other cases. + pub fn imul_pow5(x: &mut Vec<Limb>, n: u32) { + use super::large::KARATSUBA_CUTOFF; + + let small_powers = POW5_LIMB; + let large_powers = large_powers::POW5; + + if n == 0 { + // No exponent, just return. + // The 0-index of the large powers is `2^0`, which is 1, so we want + // to make sure we don't take that path with a literal 0. + return; + } + + // We want to use the asymptotically faster algorithm if we're going + // to be using Karabatsu multiplication sometime during the result, + // otherwise, just use exponentiation by squaring. + let bit_length = 32 - n.leading_zeros() as usize; + debug_assert!(bit_length != 0 && bit_length <= large_powers.len()); + if x.len() + large_powers[bit_length - 1].len() < 2 * KARATSUBA_CUTOFF { + // We can use iterative small powers to make this faster for the + // easy cases. + + // Multiply by the largest small power until n < step. + let step = small_powers.len() - 1; + let power = small_powers[step]; + let mut n = n as usize; + while n >= step { + imul(x, power); + n -= step; + } + + // Multiply by the remainder. + imul(x, small_powers[n]); + } else { + // In theory, this code should be asymptotically a lot faster, + // in practice, our small::imul seems to be the limiting step, + // and large imul is slow as well. + + // Multiply by higher order powers. + let mut idx: usize = 0; + let mut bit: usize = 1; + let mut n = n as usize; + while n != 0 { + if n & bit != 0 { + debug_assert!(idx < large_powers.len()); + large::imul(x, large_powers[idx]); + n ^= bit; + } + idx += 1; + bit <<= 1; + } + } + } + + // BIT LENGTH + + /// Get number of leading zero bits in the storage. + #[inline] + pub fn leading_zeros(x: &[Limb]) -> usize { + x.last().map_or(0, |x| x.leading_zeros() as usize) + } + + /// Calculate the bit-length of the big-integer. + #[inline] + pub fn bit_length(x: &[Limb]) -> usize { + let bits = mem::size_of::<Limb>() * 8; + // Avoid overflowing, calculate via total number of bits + // minus leading zero bits. + let nlz = leading_zeros(x); + bits.checked_mul(x.len()) + .map_or_else(usize::max_value, |v| v - nlz) + } + + // SHL + + /// Shift-left bits inside a buffer. + /// + /// Assumes `n < Limb::BITS`, IE, internally shifting bits. + #[inline] + pub fn ishl_bits(x: &mut Vec<Limb>, n: usize) { + // Need to shift by the number of `bits % Limb::BITS)`. + let bits = mem::size_of::<Limb>() * 8; + debug_assert!(n < bits); + if n == 0 { + return; + } + + // Internally, for each item, we shift left by n, and add the previous + // right shifted limb-bits. + // For example, we transform (for u8) shifted left 2, to: + // b10100100 b01000010 + // b10 b10010001 b00001000 + let rshift = bits - n; + let lshift = n; + let mut prev: Limb = 0; + for xi in x.iter_mut() { + let tmp = *xi; + *xi <<= lshift; + *xi |= prev >> rshift; + prev = tmp; + } + + // Always push the carry, even if it creates a non-normal result. + let carry = prev >> rshift; + if carry != 0 { + x.push(carry); + } + } + + /// Shift-left `n` digits inside a buffer. + /// + /// Assumes `n` is not 0. + #[inline] + pub fn ishl_limbs(x: &mut Vec<Limb>, n: usize) { + debug_assert!(n != 0); + if !x.is_empty() { + x.reserve(n); + x.splice(..0, iter::repeat(0).take(n)); + } + } + + /// Shift-left buffer by n bits. + #[inline] + pub fn ishl(x: &mut Vec<Limb>, n: usize) { + let bits = mem::size_of::<Limb>() * 8; + // Need to pad with zeros for the number of `bits / Limb::BITS`, + // and shift-left with carry for `bits % Limb::BITS`. + let rem = n % bits; + let div = n / bits; + ishl_bits(x, rem); + if div != 0 { + ishl_limbs(x, div); + } + } + + // NORMALIZE + + /// Normalize the container by popping any leading zeros. + #[inline] + pub fn normalize(x: &mut Vec<Limb>) { + // Remove leading zero if we cause underflow. Since we're dividing + // by a small power, we have at max 1 int removed. + while x.last() == Some(&0) { + x.pop(); + } + } +} // small + +// LARGE +// ----- + +// Large-to-large operations, to modify a big integer from a native scalar. + +mod large { + use super::*; + + // RELATIVE OPERATORS + + /// Compare `x` to `y`, in little-endian order. + #[inline] + pub fn compare(x: &[Limb], y: &[Limb]) -> cmp::Ordering { + if x.len() > y.len() { + cmp::Ordering::Greater + } else if x.len() < y.len() { + cmp::Ordering::Less + } else { + let iter = x.iter().rev().zip(y.iter().rev()); + for (&xi, &yi) in iter { + if xi > yi { + return cmp::Ordering::Greater; + } else if xi < yi { + return cmp::Ordering::Less; + } + } + // Equal case. + cmp::Ordering::Equal + } + } + + /// Check if x is less than y. + #[inline] + pub fn less(x: &[Limb], y: &[Limb]) -> bool { + compare(x, y) == cmp::Ordering::Less + } + + /// Check if x is greater than or equal to y. + #[inline] + pub fn greater_equal(x: &[Limb], y: &[Limb]) -> bool { + !less(x, y) + } + + // ADDITION + + /// Implied AddAssign implementation for bigints. + /// + /// Allows us to choose a start-index in x to store, so we can avoid + /// padding the buffer with zeros when not needed, optimized for vectors. + pub fn iadd_impl(x: &mut Vec<Limb>, y: &[Limb], xstart: usize) { + // The effective x buffer is from `xstart..x.len()`, so we need to treat + // that as the current range. If the effective y buffer is longer, need + // to resize to that, + the start index. + if y.len() > x.len() - xstart { + x.resize(y.len() + xstart, 0); + } + + // Iteratively add elements from y to x. + let mut carry = false; + for (xi, yi) in x[xstart..].iter_mut().zip(y.iter()) { + // Only one op of the two can overflow, since we added at max + // Limb::max_value() + Limb::max_value(). Add the previous carry, + // and store the current carry for the next. + let mut tmp = scalar::iadd(xi, *yi); + if carry { + tmp |= scalar::iadd(xi, 1); + } + carry = tmp; + } + + // Overflow from the previous bit. + if carry { + small::iadd_impl(x, 1, y.len() + xstart); + } + } + + /// AddAssign bigint to bigint. + #[inline] + pub fn iadd(x: &mut Vec<Limb>, y: &[Limb]) { + iadd_impl(x, y, 0); + } + + /// Add bigint to bigint. + #[inline] + pub fn add(x: &[Limb], y: &[Limb]) -> Vec<Limb> { + let mut z = Vec::<Limb>::default(); + z.extend_from_slice(x); + iadd(&mut z, y); + z + } + + // SUBTRACTION + + /// SubAssign bigint to bigint. + pub fn isub(x: &mut Vec<Limb>, y: &[Limb]) { + // Basic underflow checks. + debug_assert!(greater_equal(x, y)); + + // Iteratively add elements from y to x. + let mut carry = false; + for (xi, yi) in x.iter_mut().zip(y.iter()) { + // Only one op of the two can overflow, since we added at max + // Limb::max_value() + Limb::max_value(). Add the previous carry, + // and store the current carry for the next. + let mut tmp = scalar::isub(xi, *yi); + if carry { + tmp |= scalar::isub(xi, 1); + } + carry = tmp; + } + + if carry { + small::isub_impl(x, 1, y.len()); + } else { + small::normalize(x); + } + } + + // MULTIPLICATION + + /// Number of digits to bottom-out to asymptotically slow algorithms. + /// + /// Karatsuba tends to out-perform long-multiplication at ~320-640 bits, + /// so we go halfway, while Newton division tends to out-perform + /// Algorithm D at ~1024 bits. We can toggle this for optimal performance. + pub const KARATSUBA_CUTOFF: usize = 32; + + /// Grade-school multiplication algorithm. + /// + /// Slow, naive algorithm, using limb-bit bases and just shifting left for + /// each iteration. This could be optimized with numerous other algorithms, + /// but it's extremely simple, and works in O(n*m) time, which is fine + /// by me. Each iteration, of which there are `m` iterations, requires + /// `n` multiplications, and `n` additions, or grade-school multiplication. + fn long_mul(x: &[Limb], y: &[Limb]) -> Vec<Limb> { + // Using the immutable value, multiply by all the scalars in y, using + // the algorithm defined above. Use a single buffer to avoid + // frequent reallocations. Handle the first case to avoid a redundant + // addition, since we know y.len() >= 1. + let mut z: Vec<Limb> = small::mul(x, y[0]); + z.resize(x.len() + y.len(), 0); + + // Handle the iterative cases. + for (i, &yi) in y[1..].iter().enumerate() { + let zi: Vec<Limb> = small::mul(x, yi); + iadd_impl(&mut z, &zi, i + 1); + } + + small::normalize(&mut z); + + z + } + + /// Split two buffers into halfway, into (lo, hi). + #[inline] + pub fn karatsuba_split(z: &[Limb], m: usize) -> (&[Limb], &[Limb]) { + (&z[..m], &z[m..]) + } + + /// Karatsuba multiplication algorithm with roughly equal input sizes. + /// + /// Assumes `y.len() >= x.len()`. + fn karatsuba_mul(x: &[Limb], y: &[Limb]) -> Vec<Limb> { + if y.len() <= KARATSUBA_CUTOFF { + // Bottom-out to long division for small cases. + long_mul(x, y) + } else if x.len() < y.len() / 2 { + karatsuba_uneven_mul(x, y) + } else { + // Do our 3 multiplications. + let m = y.len() / 2; + let (xl, xh) = karatsuba_split(x, m); + let (yl, yh) = karatsuba_split(y, m); + let sumx = add(xl, xh); + let sumy = add(yl, yh); + let z0 = karatsuba_mul(xl, yl); + let mut z1 = karatsuba_mul(&sumx, &sumy); + let z2 = karatsuba_mul(xh, yh); + // Properly scale z1, which is `z1 - z2 - zo`. + isub(&mut z1, &z2); + isub(&mut z1, &z0); + + // Create our result, which is equal to, in little-endian order: + // [z0, z1 - z2 - z0, z2] + // z1 must be shifted m digits (2^(32m)) over. + // z2 must be shifted 2*m digits (2^(64m)) over. + let len = z0.len().max(m + z1.len()).max(2 * m + z2.len()); + let mut result = z0; + result.reserve_exact(len - result.len()); + iadd_impl(&mut result, &z1, m); + iadd_impl(&mut result, &z2, 2 * m); + + result + } + } + + /// Karatsuba multiplication algorithm where y is substantially larger than x. + /// + /// Assumes `y.len() >= x.len()`. + fn karatsuba_uneven_mul(x: &[Limb], mut y: &[Limb]) -> Vec<Limb> { + let mut result = Vec::<Limb>::default(); + result.resize(x.len() + y.len(), 0); + + // This effectively is like grade-school multiplication between + // two numbers, except we're using splits on `y`, and the intermediate + // step is a Karatsuba multiplication. + let mut start = 0; + while !y.is_empty() { + let m = x.len().min(y.len()); + let (yl, yh) = karatsuba_split(y, m); + let prod = karatsuba_mul(x, yl); + iadd_impl(&mut result, &prod, start); + y = yh; + start += m; + } + small::normalize(&mut result); + + result + } + + /// Forwarder to the proper Karatsuba algorithm. + #[inline] + fn karatsuba_mul_fwd(x: &[Limb], y: &[Limb]) -> Vec<Limb> { + if x.len() < y.len() { + karatsuba_mul(x, y) + } else { + karatsuba_mul(y, x) + } + } + + /// MulAssign bigint to bigint. + #[inline] + pub fn imul(x: &mut Vec<Limb>, y: &[Limb]) { + if y.len() == 1 { + small::imul(x, y[0]); + } else { + // We're not really in a condition where using Karatsuba + // multiplication makes sense, so we're just going to use long + // division. ~20% speedup compared to: + // *x = karatsuba_mul_fwd(x, y); + *x = karatsuba_mul_fwd(x, y); + } + } +} // large + +// TRAITS +// ------ + +/// Traits for shared operations for big integers. +/// +/// None of these are implemented using normal traits, since these +/// are very expensive operations, and we want to deliberately +/// and explicitly use these functions. +pub(crate) trait Math: Clone + Sized + Default { + // DATA + + /// Get access to the underlying data + fn data(&self) -> &Vec<Limb>; + + /// Get access to the underlying data + fn data_mut(&mut self) -> &mut Vec<Limb>; + + // RELATIVE OPERATIONS + + /// Compare self to y. + #[inline] + fn compare(&self, y: &Self) -> cmp::Ordering { + large::compare(self.data(), y.data()) + } + + // PROPERTIES + + /// Get the high 64-bits from the bigint and if there are remaining bits. + #[inline] + fn hi64(&self) -> (u64, bool) { + self.data().as_slice().hi64() + } + + /// Calculate the bit-length of the big-integer. + /// Returns usize::max_value() if the value overflows, + /// IE, if `self.data().len() > usize::max_value() / 8`. + #[inline] + fn bit_length(&self) -> usize { + small::bit_length(self.data()) + } + + // INTEGER CONVERSIONS + + /// Create new big integer from u64. + #[inline] + fn from_u64(x: u64) -> Self { + let mut v = Self::default(); + let slc = split_u64(x); + v.data_mut().extend_from_slice(&slc); + v.normalize(); + v + } + + // NORMALIZE + + /// Normalize the integer, so any leading zero values are removed. + #[inline] + fn normalize(&mut self) { + small::normalize(self.data_mut()); + } + + // ADDITION + + /// AddAssign small integer. + #[inline] + fn iadd_small(&mut self, y: Limb) { + small::iadd(self.data_mut(), y); + } + + // MULTIPLICATION + + /// MulAssign small integer. + #[inline] + fn imul_small(&mut self, y: Limb) { + small::imul(self.data_mut(), y); + } + + /// Multiply by a power of 2. + #[inline] + fn imul_pow2(&mut self, n: u32) { + self.ishl(n as usize); + } + + /// Multiply by a power of 5. + #[inline] + fn imul_pow5(&mut self, n: u32) { + small::imul_pow5(self.data_mut(), n); + } + + /// MulAssign by a power of 10. + #[inline] + fn imul_pow10(&mut self, n: u32) { + self.imul_pow5(n); + self.imul_pow2(n); + } + + // SHIFTS + + /// Shift-left the entire buffer n bits. + #[inline] + fn ishl(&mut self, n: usize) { + small::ishl(self.data_mut(), n); + } +} diff --git a/vendor/serde_json/src/lexical/mod.rs b/vendor/serde_json/src/lexical/mod.rs new file mode 100644 index 000000000..b1a45e218 --- /dev/null +++ b/vendor/serde_json/src/lexical/mod.rs @@ -0,0 +1,38 @@ +// The code in this module is derived from the `lexical` crate by @Alexhuszagh +// which the author condensed into this minimal subset for use in serde_json. +// For the serde_json use case we care more about reliably round tripping all +// possible floating point values than about parsing any arbitrarily long string +// of digits with perfect accuracy, as the latter would take a high cost in +// compile time and performance. +// +// Dual licensed as MIT and Apache 2.0 just like the rest of serde_json, but +// copyright Alexander Huszagh. + +//! Fast, minimal float-parsing algorithm. + +// MODULES +pub(crate) mod algorithm; +mod bhcomp; +mod bignum; +mod cached; +mod cached_float80; +mod digit; +mod errors; +pub(crate) mod exponent; +pub(crate) mod float; +mod large_powers; +pub(crate) mod math; +pub(crate) mod num; +pub(crate) mod parse; +pub(crate) mod rounding; +mod shift; +mod small_powers; + +#[cfg(limb_width_32)] +mod large_powers32; + +#[cfg(limb_width_64)] +mod large_powers64; + +// API +pub use self::parse::{parse_concise_float, parse_truncated_float}; diff --git a/vendor/serde_json/src/lexical/num.rs b/vendor/serde_json/src/lexical/num.rs new file mode 100644 index 000000000..e47e00341 --- /dev/null +++ b/vendor/serde_json/src/lexical/num.rs @@ -0,0 +1,440 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Utilities for Rust numbers. + +use core::ops; + +/// Precalculated values of radix**i for i in range [0, arr.len()-1]. +/// Each value can be **exactly** represented as that type. +const F32_POW10: [f32; 11] = [ + 1.0, + 10.0, + 100.0, + 1000.0, + 10000.0, + 100000.0, + 1000000.0, + 10000000.0, + 100000000.0, + 1000000000.0, + 10000000000.0, +]; + +/// Precalculated values of radix**i for i in range [0, arr.len()-1]. +/// Each value can be **exactly** represented as that type. +const F64_POW10: [f64; 23] = [ + 1.0, + 10.0, + 100.0, + 1000.0, + 10000.0, + 100000.0, + 1000000.0, + 10000000.0, + 100000000.0, + 1000000000.0, + 10000000000.0, + 100000000000.0, + 1000000000000.0, + 10000000000000.0, + 100000000000000.0, + 1000000000000000.0, + 10000000000000000.0, + 100000000000000000.0, + 1000000000000000000.0, + 10000000000000000000.0, + 100000000000000000000.0, + 1000000000000000000000.0, + 10000000000000000000000.0, +]; + +/// Type that can be converted to primitive with `as`. +pub trait AsPrimitive: Sized + Copy + PartialOrd { + fn as_u32(self) -> u32; + fn as_u64(self) -> u64; + fn as_u128(self) -> u128; + fn as_usize(self) -> usize; + fn as_f32(self) -> f32; + fn as_f64(self) -> f64; +} + +macro_rules! as_primitive_impl { + ($($ty:ident)*) => { + $( + impl AsPrimitive for $ty { + #[inline] + fn as_u32(self) -> u32 { + self as u32 + } + + #[inline] + fn as_u64(self) -> u64 { + self as u64 + } + + #[inline] + fn as_u128(self) -> u128 { + self as u128 + } + + #[inline] + fn as_usize(self) -> usize { + self as usize + } + + #[inline] + fn as_f32(self) -> f32 { + self as f32 + } + + #[inline] + fn as_f64(self) -> f64 { + self as f64 + } + } + )* + }; +} + +as_primitive_impl! { u32 u64 u128 usize f32 f64 } + +/// An interface for casting between machine scalars. +pub trait AsCast: AsPrimitive { + /// Creates a number from another value that can be converted into + /// a primitive via the `AsPrimitive` trait. + fn as_cast<N: AsPrimitive>(n: N) -> Self; +} + +macro_rules! as_cast_impl { + ($ty:ident, $method:ident) => { + impl AsCast for $ty { + #[inline] + fn as_cast<N: AsPrimitive>(n: N) -> Self { + n.$method() + } + } + }; +} + +as_cast_impl!(u32, as_u32); +as_cast_impl!(u64, as_u64); +as_cast_impl!(u128, as_u128); +as_cast_impl!(usize, as_usize); +as_cast_impl!(f32, as_f32); +as_cast_impl!(f64, as_f64); + +/// Numerical type trait. +pub trait Number: AsCast + ops::Add<Output = Self> {} + +macro_rules! number_impl { + ($($ty:ident)*) => { + $( + impl Number for $ty {} + )* + }; +} + +number_impl! { u32 u64 u128 usize f32 f64 } + +/// Defines a trait that supports integral operations. +pub trait Integer: Number + ops::BitAnd<Output = Self> + ops::Shr<i32, Output = Self> { + const ZERO: Self; +} + +macro_rules! integer_impl { + ($($ty:tt)*) => { + $( + impl Integer for $ty { + const ZERO: Self = 0; + } + )* + }; +} + +integer_impl! { u32 u64 u128 usize } + +/// Type trait for the mantissa type. +pub trait Mantissa: Integer { + /// Mask to extract the high bits from the integer. + const HIMASK: Self; + /// Mask to extract the low bits from the integer. + const LOMASK: Self; + /// Full size of the integer, in bits. + const FULL: i32; + /// Half size of the integer, in bits. + const HALF: i32 = Self::FULL / 2; +} + +impl Mantissa for u64 { + const HIMASK: u64 = 0xFFFFFFFF00000000; + const LOMASK: u64 = 0x00000000FFFFFFFF; + const FULL: i32 = 64; +} + +/// Get exact exponent limit for radix. +pub trait Float: Number { + /// Unsigned type of the same size. + type Unsigned: Integer; + + /// Literal zero. + const ZERO: Self; + /// Maximum number of digits that can contribute in the mantissa. + /// + /// We can exactly represent a float in radix `b` from radix 2 if + /// `b` is divisible by 2. This function calculates the exact number of + /// digits required to exactly represent that float. + /// + /// According to the "Handbook of Floating Point Arithmetic", + /// for IEEE754, with emin being the min exponent, p2 being the + /// precision, and b being the radix, the number of digits follows as: + /// + /// `−emin + p2 + ⌊(emin + 1) log(2, b) − log(1 − 2^(−p2), b)⌋` + /// + /// For f32, this follows as: + /// emin = -126 + /// p2 = 24 + /// + /// For f64, this follows as: + /// emin = -1022 + /// p2 = 53 + /// + /// In Python: + /// `-emin + p2 + math.floor((emin+1)*math.log(2, b) - math.log(1-2**(-p2), b))` + /// + /// This was used to calculate the maximum number of digits for [2, 36]. + const MAX_DIGITS: usize; + + // MASKS + + /// Bitmask for the sign bit. + const SIGN_MASK: Self::Unsigned; + /// Bitmask for the exponent, including the hidden bit. + const EXPONENT_MASK: Self::Unsigned; + /// Bitmask for the hidden bit in exponent, which is an implicit 1 in the fraction. + const HIDDEN_BIT_MASK: Self::Unsigned; + /// Bitmask for the mantissa (fraction), excluding the hidden bit. + const MANTISSA_MASK: Self::Unsigned; + + // PROPERTIES + + /// Positive infinity as bits. + const INFINITY_BITS: Self::Unsigned; + /// Positive infinity as bits. + const NEGATIVE_INFINITY_BITS: Self::Unsigned; + /// Size of the significand (mantissa) without hidden bit. + const MANTISSA_SIZE: i32; + /// Bias of the exponet + const EXPONENT_BIAS: i32; + /// Exponent portion of a denormal float. + const DENORMAL_EXPONENT: i32; + /// Maximum exponent value in float. + const MAX_EXPONENT: i32; + + // ROUNDING + + /// Default number of bits to shift (or 64 - mantissa size - 1). + const DEFAULT_SHIFT: i32; + /// Mask to determine if a full-carry occurred (1 in bit above hidden bit). + const CARRY_MASK: u64; + + /// Get min and max exponent limits (exact) from radix. + fn exponent_limit() -> (i32, i32); + + /// Get the number of digits that can be shifted from exponent to mantissa. + fn mantissa_limit() -> i32; + + // Re-exported methods from std. + fn pow10(self, n: i32) -> Self; + fn from_bits(u: Self::Unsigned) -> Self; + fn to_bits(self) -> Self::Unsigned; + fn is_sign_positive(self) -> bool; + fn is_sign_negative(self) -> bool; + + /// Returns true if the float is a denormal. + #[inline] + fn is_denormal(self) -> bool { + self.to_bits() & Self::EXPONENT_MASK == Self::Unsigned::ZERO + } + + /// Returns true if the float is a NaN or Infinite. + #[inline] + fn is_special(self) -> bool { + self.to_bits() & Self::EXPONENT_MASK == Self::EXPONENT_MASK + } + + /// Returns true if the float is infinite. + #[inline] + fn is_inf(self) -> bool { + self.is_special() && (self.to_bits() & Self::MANTISSA_MASK) == Self::Unsigned::ZERO + } + + /// Get exponent component from the float. + #[inline] + fn exponent(self) -> i32 { + if self.is_denormal() { + return Self::DENORMAL_EXPONENT; + } + + let bits = self.to_bits(); + let biased_e = ((bits & Self::EXPONENT_MASK) >> Self::MANTISSA_SIZE).as_u32(); + biased_e as i32 - Self::EXPONENT_BIAS + } + + /// Get mantissa (significand) component from float. + #[inline] + fn mantissa(self) -> Self::Unsigned { + let bits = self.to_bits(); + let s = bits & Self::MANTISSA_MASK; + if !self.is_denormal() { + s + Self::HIDDEN_BIT_MASK + } else { + s + } + } + + /// Get next greater float for a positive float. + /// Value must be >= 0.0 and < INFINITY. + #[inline] + fn next_positive(self) -> Self { + debug_assert!(self.is_sign_positive() && !self.is_inf()); + Self::from_bits(self.to_bits() + Self::Unsigned::as_cast(1u32)) + } + + /// Round a positive number to even. + #[inline] + fn round_positive_even(self) -> Self { + if self.mantissa() & Self::Unsigned::as_cast(1u32) == Self::Unsigned::as_cast(1u32) { + self.next_positive() + } else { + self + } + } +} + +impl Float for f32 { + type Unsigned = u32; + + const ZERO: f32 = 0.0; + const MAX_DIGITS: usize = 114; + const SIGN_MASK: u32 = 0x80000000; + const EXPONENT_MASK: u32 = 0x7F800000; + const HIDDEN_BIT_MASK: u32 = 0x00800000; + const MANTISSA_MASK: u32 = 0x007FFFFF; + const INFINITY_BITS: u32 = 0x7F800000; + const NEGATIVE_INFINITY_BITS: u32 = Self::INFINITY_BITS | Self::SIGN_MASK; + const MANTISSA_SIZE: i32 = 23; + const EXPONENT_BIAS: i32 = 127 + Self::MANTISSA_SIZE; + const DENORMAL_EXPONENT: i32 = 1 - Self::EXPONENT_BIAS; + const MAX_EXPONENT: i32 = 0xFF - Self::EXPONENT_BIAS; + const DEFAULT_SHIFT: i32 = u64::FULL - f32::MANTISSA_SIZE - 1; + const CARRY_MASK: u64 = 0x1000000; + + #[inline] + fn exponent_limit() -> (i32, i32) { + (-10, 10) + } + + #[inline] + fn mantissa_limit() -> i32 { + 7 + } + + #[inline] + fn pow10(self, n: i32) -> f32 { + // Check the exponent is within bounds in debug builds. + debug_assert!({ + let (min, max) = Self::exponent_limit(); + n >= min && n <= max + }); + + if n > 0 { + self * F32_POW10[n as usize] + } else { + self / F32_POW10[-n as usize] + } + } + + #[inline] + fn from_bits(u: u32) -> f32 { + f32::from_bits(u) + } + + #[inline] + fn to_bits(self) -> u32 { + f32::to_bits(self) + } + + #[inline] + fn is_sign_positive(self) -> bool { + f32::is_sign_positive(self) + } + + #[inline] + fn is_sign_negative(self) -> bool { + f32::is_sign_negative(self) + } +} + +impl Float for f64 { + type Unsigned = u64; + + const ZERO: f64 = 0.0; + const MAX_DIGITS: usize = 769; + const SIGN_MASK: u64 = 0x8000000000000000; + const EXPONENT_MASK: u64 = 0x7FF0000000000000; + const HIDDEN_BIT_MASK: u64 = 0x0010000000000000; + const MANTISSA_MASK: u64 = 0x000FFFFFFFFFFFFF; + const INFINITY_BITS: u64 = 0x7FF0000000000000; + const NEGATIVE_INFINITY_BITS: u64 = Self::INFINITY_BITS | Self::SIGN_MASK; + const MANTISSA_SIZE: i32 = 52; + const EXPONENT_BIAS: i32 = 1023 + Self::MANTISSA_SIZE; + const DENORMAL_EXPONENT: i32 = 1 - Self::EXPONENT_BIAS; + const MAX_EXPONENT: i32 = 0x7FF - Self::EXPONENT_BIAS; + const DEFAULT_SHIFT: i32 = u64::FULL - f64::MANTISSA_SIZE - 1; + const CARRY_MASK: u64 = 0x20000000000000; + + #[inline] + fn exponent_limit() -> (i32, i32) { + (-22, 22) + } + + #[inline] + fn mantissa_limit() -> i32 { + 15 + } + + #[inline] + fn pow10(self, n: i32) -> f64 { + // Check the exponent is within bounds in debug builds. + debug_assert!({ + let (min, max) = Self::exponent_limit(); + n >= min && n <= max + }); + + if n > 0 { + self * F64_POW10[n as usize] + } else { + self / F64_POW10[-n as usize] + } + } + + #[inline] + fn from_bits(u: u64) -> f64 { + f64::from_bits(u) + } + + #[inline] + fn to_bits(self) -> u64 { + f64::to_bits(self) + } + + #[inline] + fn is_sign_positive(self) -> bool { + f64::is_sign_positive(self) + } + + #[inline] + fn is_sign_negative(self) -> bool { + f64::is_sign_negative(self) + } +} diff --git a/vendor/serde_json/src/lexical/parse.rs b/vendor/serde_json/src/lexical/parse.rs new file mode 100644 index 000000000..e3d7f1e87 --- /dev/null +++ b/vendor/serde_json/src/lexical/parse.rs @@ -0,0 +1,83 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use super::algorithm::*; +use super::bhcomp::*; +use super::digit::*; +use super::exponent::*; +use super::num::*; + +// PARSERS +// ------- + +/// Parse float for which the entire integer and fraction parts fit into a 64 +/// bit mantissa. +pub fn parse_concise_float<F>(mantissa: u64, mant_exp: i32) -> F +where + F: Float, +{ + if let Some(float) = fast_path(mantissa, mant_exp) { + return float; + } + + // Moderate path (use an extended 80-bit representation). + let truncated = false; + let (fp, valid) = moderate_path::<F>(mantissa, mant_exp, truncated); + if valid { + return fp.into_float::<F>(); + } + + let b = fp.into_downward_float::<F>(); + if b.is_special() { + // We have a non-finite number, we get to leave early. + return b; + } + + // Slow path, fast path didn't work. + let mut buffer = itoa::Buffer::new(); + let integer = buffer.format(mantissa).as_bytes(); + let fraction = &[]; + bhcomp(b, integer, fraction, mant_exp) +} + +/// Parse float from extracted float components. +/// +/// * `integer` - Slice containing the integer digits. +/// * `fraction` - Slice containing the fraction digits. +/// * `exponent` - Parsed, 32-bit exponent. +/// +/// Precondition: The integer must not have leading zeros. +pub fn parse_truncated_float<F>(integer: &[u8], mut fraction: &[u8], exponent: i32) -> F +where + F: Float, +{ + // Trim trailing zeroes from the fraction part. + while fraction.last() == Some(&b'0') { + fraction = &fraction[..fraction.len() - 1]; + } + + // Calculate the number of truncated digits. + let mut truncated = 0; + let mut mantissa: u64 = 0; + let mut iter = integer.iter().chain(fraction); + for &c in &mut iter { + mantissa = match add_digit(mantissa, to_digit(c).unwrap()) { + Some(v) => v, + None => { + truncated = 1 + iter.count(); + break; + } + }; + } + + let mant_exp = mantissa_exponent(exponent, fraction.len(), truncated); + let is_truncated = true; + + fallback_path( + integer, + fraction, + mantissa, + exponent, + mant_exp, + is_truncated, + ) +} diff --git a/vendor/serde_json/src/lexical/rounding.rs b/vendor/serde_json/src/lexical/rounding.rs new file mode 100644 index 000000000..6ec1292aa --- /dev/null +++ b/vendor/serde_json/src/lexical/rounding.rs @@ -0,0 +1,231 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Defines rounding schemes for floating-point numbers. + +use super::float::ExtendedFloat; +use super::num::*; +use super::shift::*; +use core::mem; + +// MASKS + +/// Calculate a scalar factor of 2 above the halfway point. +#[inline] +pub(crate) fn nth_bit(n: u64) -> u64 { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!(n < bits, "nth_bit() overflow in shl."); + + 1 << n +} + +/// Generate a bitwise mask for the lower `n` bits. +#[inline] +pub(crate) fn lower_n_mask(n: u64) -> u64 { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!(n <= bits, "lower_n_mask() overflow in shl."); + + if n == bits { + u64::max_value() + } else { + (1 << n) - 1 + } +} + +/// Calculate the halfway point for the lower `n` bits. +#[inline] +pub(crate) fn lower_n_halfway(n: u64) -> u64 { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!(n <= bits, "lower_n_halfway() overflow in shl."); + + if n == 0 { + 0 + } else { + nth_bit(n - 1) + } +} + +/// Calculate a bitwise mask with `n` 1 bits starting at the `bit` position. +#[inline] +pub(crate) fn internal_n_mask(bit: u64, n: u64) -> u64 { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!(bit <= bits, "internal_n_halfway() overflow in shl."); + debug_assert!(n <= bits, "internal_n_halfway() overflow in shl."); + debug_assert!(bit >= n, "internal_n_halfway() overflow in sub."); + + lower_n_mask(bit) ^ lower_n_mask(bit - n) +} + +// NEAREST ROUNDING + +// Shift right N-bytes and round to the nearest. +// +// Return if we are above halfway and if we are halfway. +#[inline] +pub(crate) fn round_nearest(fp: &mut ExtendedFloat, shift: i32) -> (bool, bool) { + // Extract the truncated bits using mask. + // Calculate if the value of the truncated bits are either above + // the mid-way point, or equal to it. + // + // For example, for 4 truncated bytes, the mask would be b1111 + // and the midway point would be b1000. + let mask: u64 = lower_n_mask(shift as u64); + let halfway: u64 = lower_n_halfway(shift as u64); + + let truncated_bits = fp.mant & mask; + let is_above = truncated_bits > halfway; + let is_halfway = truncated_bits == halfway; + + // Bit shift so the leading bit is in the hidden bit. + overflowing_shr(fp, shift); + + (is_above, is_halfway) +} + +// Tie rounded floating point to event. +#[inline] +pub(crate) fn tie_even(fp: &mut ExtendedFloat, is_above: bool, is_halfway: bool) { + // Extract the last bit after shifting (and determine if it is odd). + let is_odd = fp.mant & 1 == 1; + + // Calculate if we need to roundup. + // We need to roundup if we are above halfway, or if we are odd + // and at half-way (need to tie-to-even). + if is_above || (is_odd && is_halfway) { + fp.mant += 1; + } +} + +// Shift right N-bytes and round nearest, tie-to-even. +// +// Floating-point arithmetic uses round to nearest, ties to even, +// which rounds to the nearest value, if the value is halfway in between, +// round to an even value. +#[inline] +pub(crate) fn round_nearest_tie_even(fp: &mut ExtendedFloat, shift: i32) { + let (is_above, is_halfway) = round_nearest(fp, shift); + tie_even(fp, is_above, is_halfway); +} + +// DIRECTED ROUNDING + +// Shift right N-bytes and round towards a direction. +// +// Return if we have any truncated bytes. +#[inline] +fn round_toward(fp: &mut ExtendedFloat, shift: i32) -> bool { + let mask: u64 = lower_n_mask(shift as u64); + let truncated_bits = fp.mant & mask; + + // Bit shift so the leading bit is in the hidden bit. + overflowing_shr(fp, shift); + + truncated_bits != 0 +} + +// Round down. +#[inline] +fn downard(_: &mut ExtendedFloat, _: bool) {} + +// Shift right N-bytes and round toward zero. +// +// Floating-point arithmetic defines round toward zero, which rounds +// towards positive zero. +#[inline] +pub(crate) fn round_downward(fp: &mut ExtendedFloat, shift: i32) { + // Bit shift so the leading bit is in the hidden bit. + // No rounding schemes, so we just ignore everything else. + let is_truncated = round_toward(fp, shift); + downard(fp, is_truncated); +} + +// ROUND TO FLOAT + +// Shift the ExtendedFloat fraction to the fraction bits in a native float. +// +// Floating-point arithmetic uses round to nearest, ties to even, +// which rounds to the nearest value, if the value is halfway in between, +// round to an even value. +#[inline] +pub(crate) fn round_to_float<F, Algorithm>(fp: &mut ExtendedFloat, algorithm: Algorithm) +where + F: Float, + Algorithm: FnOnce(&mut ExtendedFloat, i32), +{ + // Calculate the difference to allow a single calculation + // rather than a loop, to minimize the number of ops required. + // This does underflow detection. + let final_exp = fp.exp + F::DEFAULT_SHIFT; + if final_exp < F::DENORMAL_EXPONENT { + // We would end up with a denormal exponent, try to round to more + // digits. Only shift right if we can avoid zeroing out the value, + // which requires the exponent diff to be < M::BITS. The value + // is already normalized, so we shouldn't have any issue zeroing + // out the value. + let diff = F::DENORMAL_EXPONENT - fp.exp; + if diff <= u64::FULL { + // We can avoid underflow, can get a valid representation. + algorithm(fp, diff); + } else { + // Certain underflow, assign literal 0s. + fp.mant = 0; + fp.exp = 0; + } + } else { + algorithm(fp, F::DEFAULT_SHIFT); + } + + if fp.mant & F::CARRY_MASK == F::CARRY_MASK { + // Roundup carried over to 1 past the hidden bit. + shr(fp, 1); + } +} + +// AVOID OVERFLOW/UNDERFLOW + +// Avoid overflow for large values, shift left as needed. +// +// Shift until a 1-bit is in the hidden bit, if the mantissa is not 0. +#[inline] +pub(crate) fn avoid_overflow<F>(fp: &mut ExtendedFloat) +where + F: Float, +{ + // Calculate the difference to allow a single calculation + // rather than a loop, minimizing the number of ops required. + if fp.exp >= F::MAX_EXPONENT { + let diff = fp.exp - F::MAX_EXPONENT; + if diff <= F::MANTISSA_SIZE { + // Our overflow mask needs to start at the hidden bit, or at + // `F::MANTISSA_SIZE+1`, and needs to have `diff+1` bits set, + // to see if our value overflows. + let bit = (F::MANTISSA_SIZE + 1) as u64; + let n = (diff + 1) as u64; + let mask = internal_n_mask(bit, n); + if (fp.mant & mask) == 0 { + // If we have no 1-bit in the hidden-bit position, + // which is index 0, we need to shift 1. + let shift = diff + 1; + shl(fp, shift); + } + } + } +} + +// ROUND TO NATIVE + +// Round an extended-precision float to a native float representation. +#[inline] +pub(crate) fn round_to_native<F, Algorithm>(fp: &mut ExtendedFloat, algorithm: Algorithm) +where + F: Float, + Algorithm: FnOnce(&mut ExtendedFloat, i32), +{ + // Shift all the way left, to ensure a consistent representation. + // The following right-shifts do not work for a non-normalized number. + fp.normalize(); + + // Round so the fraction is in a native mantissa representation, + // and avoid overflow/underflow. + round_to_float::<F, _>(fp, algorithm); + avoid_overflow::<F>(fp); +} diff --git a/vendor/serde_json/src/lexical/shift.rs b/vendor/serde_json/src/lexical/shift.rs new file mode 100644 index 000000000..a0bae01e0 --- /dev/null +++ b/vendor/serde_json/src/lexical/shift.rs @@ -0,0 +1,46 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Bit-shift helpers. + +use super::float::ExtendedFloat; +use core::mem; + +// Shift extended-precision float right `shift` bytes. +#[inline] +pub(crate) fn shr(fp: &mut ExtendedFloat, shift: i32) { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!((shift as u64) < bits, "shr() overflow in shift right."); + + fp.mant >>= shift; + fp.exp += shift; +} + +// Shift extended-precision float right `shift` bytes. +// +// Accepts when the shift is the same as the type size, and +// sets the value to 0. +#[inline] +pub(crate) fn overflowing_shr(fp: &mut ExtendedFloat, shift: i32) { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!( + (shift as u64) <= bits, + "overflowing_shr() overflow in shift right." + ); + + fp.mant = if shift as u64 == bits { + 0 + } else { + fp.mant >> shift + }; + fp.exp += shift; +} + +// Shift extended-precision float left `shift` bytes. +#[inline] +pub(crate) fn shl(fp: &mut ExtendedFloat, shift: i32) { + let bits: u64 = mem::size_of::<u64>() as u64 * 8; + debug_assert!((shift as u64) < bits, "shl() overflow in shift left."); + + fp.mant <<= shift; + fp.exp -= shift; +} diff --git a/vendor/serde_json/src/lexical/small_powers.rs b/vendor/serde_json/src/lexical/small_powers.rs new file mode 100644 index 000000000..219d82611 --- /dev/null +++ b/vendor/serde_json/src/lexical/small_powers.rs @@ -0,0 +1,70 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +//! Pre-computed small powers. + +// 32 BIT +#[cfg(limb_width_32)] +pub(crate) const POW5_32: [u32; 14] = [ + 1, 5, 25, 125, 625, 3125, 15625, 78125, 390625, 1953125, 9765625, 48828125, 244140625, + 1220703125, +]; + +#[cfg(limb_width_32)] +pub(crate) const POW10_32: [u32; 10] = [ + 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, +]; + +// 64 BIT +#[cfg(limb_width_64)] +pub(crate) const POW5_64: [u64; 28] = [ + 1, + 5, + 25, + 125, + 625, + 3125, + 15625, + 78125, + 390625, + 1953125, + 9765625, + 48828125, + 244140625, + 1220703125, + 6103515625, + 30517578125, + 152587890625, + 762939453125, + 3814697265625, + 19073486328125, + 95367431640625, + 476837158203125, + 2384185791015625, + 11920928955078125, + 59604644775390625, + 298023223876953125, + 1490116119384765625, + 7450580596923828125, +]; +pub(crate) const POW10_64: [u64; 20] = [ + 1, + 10, + 100, + 1000, + 10000, + 100000, + 1000000, + 10000000, + 100000000, + 1000000000, + 10000000000, + 100000000000, + 1000000000000, + 10000000000000, + 100000000000000, + 1000000000000000, + 10000000000000000, + 100000000000000000, + 1000000000000000000, + 10000000000000000000, +]; diff --git a/vendor/serde_json/src/lib.rs b/vendor/serde_json/src/lib.rs new file mode 100644 index 000000000..736ab8472 --- /dev/null +++ b/vendor/serde_json/src/lib.rs @@ -0,0 +1,420 @@ +//! # Serde JSON +//! +//! JSON is a ubiquitous open-standard format that uses human-readable text to +//! transmit data objects consisting of key-value pairs. +//! +//! ```json +//! { +//! "name": "John Doe", +//! "age": 43, +//! "address": { +//! "street": "10 Downing Street", +//! "city": "London" +//! }, +//! "phones": [ +//! "+44 1234567", +//! "+44 2345678" +//! ] +//! } +//! ``` +//! +//! There are three common ways that you might find yourself needing to work +//! with JSON data in Rust. +//! +//! - **As text data.** An unprocessed string of JSON data that you receive on +//! an HTTP endpoint, read from a file, or prepare to send to a remote +//! server. +//! - **As an untyped or loosely typed representation.** Maybe you want to +//! check that some JSON data is valid before passing it on, but without +//! knowing the structure of what it contains. Or you want to do very basic +//! manipulations like insert a key in a particular spot. +//! - **As a strongly typed Rust data structure.** When you expect all or most +//! of your data to conform to a particular structure and want to get real +//! work done without JSON's loosey-goosey nature tripping you up. +//! +//! Serde JSON provides efficient, flexible, safe ways of converting data +//! between each of these representations. +//! +//! # Operating on untyped JSON values +//! +//! Any valid JSON data can be manipulated in the following recursive enum +//! representation. This data structure is [`serde_json::Value`][value]. +//! +//! ``` +//! # use serde_json::{Number, Map}; +//! # +//! # #[allow(dead_code)] +//! enum Value { +//! Null, +//! Bool(bool), +//! Number(Number), +//! String(String), +//! Array(Vec<Value>), +//! Object(Map<String, Value>), +//! } +//! ``` +//! +//! A string of JSON data can be parsed into a `serde_json::Value` by the +//! [`serde_json::from_str`][from_str] function. There is also +//! [`from_slice`][from_slice] for parsing from a byte slice &[u8] and +//! [`from_reader`][from_reader] for parsing from any `io::Read` like a File or +//! a TCP stream. +//! +//! ``` +//! use serde_json::{Result, Value}; +//! +//! fn untyped_example() -> Result<()> { +//! // Some JSON input data as a &str. Maybe this comes from the user. +//! let data = r#" +//! { +//! "name": "John Doe", +//! "age": 43, +//! "phones": [ +//! "+44 1234567", +//! "+44 2345678" +//! ] +//! }"#; +//! +//! // Parse the string of data into serde_json::Value. +//! let v: Value = serde_json::from_str(data)?; +//! +//! // Access parts of the data by indexing with square brackets. +//! println!("Please call {} at the number {}", v["name"], v["phones"][0]); +//! +//! Ok(()) +//! } +//! # +//! # fn main() { +//! # untyped_example().unwrap(); +//! # } +//! ``` +//! +//! The result of square bracket indexing like `v["name"]` is a borrow of the +//! data at that index, so the type is `&Value`. A JSON map can be indexed with +//! string keys, while a JSON array can be indexed with integer keys. If the +//! type of the data is not right for the type with which it is being indexed, +//! or if a map does not contain the key being indexed, or if the index into a +//! vector is out of bounds, the returned element is `Value::Null`. +//! +//! When a `Value` is printed, it is printed as a JSON string. So in the code +//! above, the output looks like `Please call "John Doe" at the number "+44 +//! 1234567"`. The quotation marks appear because `v["name"]` is a `&Value` +//! containing a JSON string and its JSON representation is `"John Doe"`. +//! Printing as a plain string without quotation marks involves converting from +//! a JSON string to a Rust string with [`as_str()`] or avoiding the use of +//! `Value` as described in the following section. +//! +//! [`as_str()`]: https://docs.serde.rs/serde_json/enum.Value.html#method.as_str +//! +//! The `Value` representation is sufficient for very basic tasks but can be +//! tedious to work with for anything more significant. Error handling is +//! verbose to implement correctly, for example imagine trying to detect the +//! presence of unrecognized fields in the input data. The compiler is powerless +//! to help you when you make a mistake, for example imagine typoing `v["name"]` +//! as `v["nmae"]` in one of the dozens of places it is used in your code. +//! +//! # Parsing JSON as strongly typed data structures +//! +//! Serde provides a powerful way of mapping JSON data into Rust data structures +//! largely automatically. +//! +//! ``` +//! use serde::{Deserialize, Serialize}; +//! use serde_json::Result; +//! +//! #[derive(Serialize, Deserialize)] +//! struct Person { +//! name: String, +//! age: u8, +//! phones: Vec<String>, +//! } +//! +//! fn typed_example() -> Result<()> { +//! // Some JSON input data as a &str. Maybe this comes from the user. +//! let data = r#" +//! { +//! "name": "John Doe", +//! "age": 43, +//! "phones": [ +//! "+44 1234567", +//! "+44 2345678" +//! ] +//! }"#; +//! +//! // Parse the string of data into a Person object. This is exactly the +//! // same function as the one that produced serde_json::Value above, but +//! // now we are asking it for a Person as output. +//! let p: Person = serde_json::from_str(data)?; +//! +//! // Do things just like with any other Rust data structure. +//! println!("Please call {} at the number {}", p.name, p.phones[0]); +//! +//! Ok(()) +//! } +//! # +//! # fn main() { +//! # typed_example().unwrap(); +//! # } +//! ``` +//! +//! This is the same `serde_json::from_str` function as before, but this time we +//! assign the return value to a variable of type `Person` so Serde will +//! automatically interpret the input data as a `Person` and produce informative +//! error messages if the layout does not conform to what a `Person` is expected +//! to look like. +//! +//! Any type that implements Serde's `Deserialize` trait can be deserialized +//! this way. This includes built-in Rust standard library types like `Vec<T>` +//! and `HashMap<K, V>`, as well as any structs or enums annotated with +//! `#[derive(Deserialize)]`. +//! +//! Once we have `p` of type `Person`, our IDE and the Rust compiler can help us +//! use it correctly like they do for any other Rust code. The IDE can +//! autocomplete field names to prevent typos, which was impossible in the +//! `serde_json::Value` representation. And the Rust compiler can check that +//! when we write `p.phones[0]`, then `p.phones` is guaranteed to be a +//! `Vec<String>` so indexing into it makes sense and produces a `String`. +//! +//! # Constructing JSON values +//! +//! Serde JSON provides a [`json!` macro][macro] to build `serde_json::Value` +//! objects with very natural JSON syntax. +//! +//! ``` +//! use serde_json::json; +//! +//! fn main() { +//! // The type of `john` is `serde_json::Value` +//! let john = json!({ +//! "name": "John Doe", +//! "age": 43, +//! "phones": [ +//! "+44 1234567", +//! "+44 2345678" +//! ] +//! }); +//! +//! println!("first phone number: {}", john["phones"][0]); +//! +//! // Convert to a string of JSON and print it out +//! println!("{}", john.to_string()); +//! } +//! ``` +//! +//! The `Value::to_string()` function converts a `serde_json::Value` into a +//! `String` of JSON text. +//! +//! One neat thing about the `json!` macro is that variables and expressions can +//! be interpolated directly into the JSON value as you are building it. Serde +//! will check at compile time that the value you are interpolating is able to +//! be represented as JSON. +//! +//! ``` +//! # use serde_json::json; +//! # +//! # fn random_phone() -> u16 { 0 } +//! # +//! let full_name = "John Doe"; +//! let age_last_year = 42; +//! +//! // The type of `john` is `serde_json::Value` +//! let john = json!({ +//! "name": full_name, +//! "age": age_last_year + 1, +//! "phones": [ +//! format!("+44 {}", random_phone()) +//! ] +//! }); +//! ``` +//! +//! This is amazingly convenient, but we have the problem we had before with +//! `Value`: the IDE and Rust compiler cannot help us if we get it wrong. Serde +//! JSON provides a better way of serializing strongly-typed data structures +//! into JSON text. +//! +//! # Creating JSON by serializing data structures +//! +//! A data structure can be converted to a JSON string by +//! [`serde_json::to_string`][to_string]. There is also +//! [`serde_json::to_vec`][to_vec] which serializes to a `Vec<u8>` and +//! [`serde_json::to_writer`][to_writer] which serializes to any `io::Write` +//! such as a File or a TCP stream. +//! +//! ``` +//! use serde::{Deserialize, Serialize}; +//! use serde_json::Result; +//! +//! #[derive(Serialize, Deserialize)] +//! struct Address { +//! street: String, +//! city: String, +//! } +//! +//! fn print_an_address() -> Result<()> { +//! // Some data structure. +//! let address = Address { +//! street: "10 Downing Street".to_owned(), +//! city: "London".to_owned(), +//! }; +//! +//! // Serialize it to a JSON string. +//! let j = serde_json::to_string(&address)?; +//! +//! // Print, write to a file, or send to an HTTP server. +//! println!("{}", j); +//! +//! Ok(()) +//! } +//! # +//! # fn main() { +//! # print_an_address().unwrap(); +//! # } +//! ``` +//! +//! Any type that implements Serde's `Serialize` trait can be serialized this +//! way. This includes built-in Rust standard library types like `Vec<T>` and +//! `HashMap<K, V>`, as well as any structs or enums annotated with +//! `#[derive(Serialize)]`. +//! +//! # No-std support +//! +//! As long as there is a memory allocator, it is possible to use serde_json +//! without the rest of the Rust standard library. This is supported on Rust +//! 1.36+. Disable the default "std" feature and enable the "alloc" feature: +//! +//! ```toml +//! [dependencies] +//! serde_json = { version = "1.0", default-features = false, features = ["alloc"] } +//! ``` +//! +//! For JSON support in Serde without a memory allocator, please see the +//! [`serde-json-core`] crate. +//! +//! [value]: https://docs.serde.rs/serde_json/value/enum.Value.html +//! [from_str]: https://docs.serde.rs/serde_json/de/fn.from_str.html +//! [from_slice]: https://docs.serde.rs/serde_json/de/fn.from_slice.html +//! [from_reader]: https://docs.serde.rs/serde_json/de/fn.from_reader.html +//! [to_string]: https://docs.serde.rs/serde_json/ser/fn.to_string.html +//! [to_vec]: https://docs.serde.rs/serde_json/ser/fn.to_vec.html +//! [to_writer]: https://docs.serde.rs/serde_json/ser/fn.to_writer.html +//! [macro]: https://docs.serde.rs/serde_json/macro.json.html +//! [`serde-json-core`]: https://github.com/rust-embedded-community/serde-json-core + +#![doc(html_root_url = "https://docs.rs/serde_json/1.0.82")] +// Ignored clippy lints +#![allow( + clippy::collapsible_else_if, + clippy::comparison_chain, + clippy::deprecated_cfg_attr, + clippy::doc_markdown, + clippy::excessive_precision, + clippy::float_cmp, + clippy::manual_range_contains, + clippy::match_like_matches_macro, + clippy::match_single_binding, + clippy::needless_doctest_main, + clippy::needless_late_init, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/8366 + clippy::ptr_arg, + clippy::return_self_not_must_use, + clippy::transmute_ptr_to_ptr, + clippy::unnecessary_wraps, + // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704 + clippy::unnested_or_patterns, +)] +// Ignored clippy_pedantic lints +#![allow( + // buggy + clippy::iter_not_returning_iterator, // https://github.com/rust-lang/rust-clippy/issues/8285 + // Deserializer::from_str, into_iter + clippy::should_implement_trait, + // integer and float ser/de requires these sorts of casts + clippy::cast_possible_truncation, + clippy::cast_possible_wrap, + clippy::cast_precision_loss, + clippy::cast_sign_loss, + // correctly used + clippy::enum_glob_use, + clippy::if_not_else, + clippy::integer_division, + clippy::map_err_ignore, + clippy::match_same_arms, + clippy::similar_names, + clippy::unused_self, + clippy::wildcard_imports, + // things are often more readable this way + clippy::cast_lossless, + clippy::module_name_repetitions, + clippy::redundant_else, + clippy::shadow_unrelated, + clippy::single_match_else, + clippy::too_many_lines, + clippy::unreadable_literal, + clippy::unseparated_literal_suffix, + clippy::use_self, + clippy::zero_prefixed_literal, + // we support older compilers + clippy::checked_conversions, + clippy::mem_replace_with_default, + // noisy + clippy::missing_errors_doc, + clippy::must_use_candidate, +)] +#![allow(non_upper_case_globals)] +#![deny(missing_docs)] +#![cfg_attr(not(feature = "std"), no_std)] +#![cfg_attr(docsrs, feature(doc_cfg))] + +extern crate alloc; + +#[cfg(feature = "std")] +#[doc(inline)] +pub use crate::de::from_reader; +#[doc(inline)] +pub use crate::de::{from_slice, from_str, Deserializer, StreamDeserializer}; +#[doc(inline)] +pub use crate::error::{Error, Result}; +#[doc(inline)] +pub use crate::ser::{to_string, to_string_pretty, to_vec, to_vec_pretty}; +#[cfg(feature = "std")] +#[doc(inline)] +pub use crate::ser::{to_writer, to_writer_pretty, Serializer}; +#[doc(inline)] +pub use crate::value::{from_value, to_value, Map, Number, Value}; + +// We only use our own error type; no need for From conversions provided by the +// standard library's try! macro. This reduces lines of LLVM IR by 4%. +macro_rules! tri { + ($e:expr $(,)?) => { + match $e { + core::result::Result::Ok(val) => val, + core::result::Result::Err(err) => return core::result::Result::Err(err), + } + }; +} + +#[macro_use] +mod macros; + +pub mod de; +pub mod error; +pub mod map; +#[cfg(feature = "std")] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub mod ser; +#[cfg(not(feature = "std"))] +mod ser; +pub mod value; + +mod features_check; + +mod io; +#[cfg(feature = "std")] +mod iter; +#[cfg(feature = "float_roundtrip")] +mod lexical; +mod number; +mod read; + +#[cfg(feature = "raw_value")] +mod raw; diff --git a/vendor/serde_json/src/macros.rs b/vendor/serde_json/src/macros.rs new file mode 100644 index 000000000..5287998b4 --- /dev/null +++ b/vendor/serde_json/src/macros.rs @@ -0,0 +1,303 @@ +/// Construct a `serde_json::Value` from a JSON literal. +/// +/// ``` +/// # use serde_json::json; +/// # +/// let value = json!({ +/// "code": 200, +/// "success": true, +/// "payload": { +/// "features": [ +/// "serde", +/// "json" +/// ] +/// } +/// }); +/// ``` +/// +/// Variables or expressions can be interpolated into the JSON literal. Any type +/// interpolated into an array element or object value must implement Serde's +/// `Serialize` trait, while any type interpolated into a object key must +/// implement `Into<String>`. If the `Serialize` implementation of the +/// interpolated type decides to fail, or if the interpolated type contains a +/// map with non-string keys, the `json!` macro will panic. +/// +/// ``` +/// # use serde_json::json; +/// # +/// let code = 200; +/// let features = vec!["serde", "json"]; +/// +/// let value = json!({ +/// "code": code, +/// "success": code == 200, +/// "payload": { +/// features[0]: features[1] +/// } +/// }); +/// ``` +/// +/// Trailing commas are allowed inside both arrays and objects. +/// +/// ``` +/// # use serde_json::json; +/// # +/// let value = json!([ +/// "notice", +/// "the", +/// "trailing", +/// "comma -->", +/// ]); +/// ``` +#[macro_export(local_inner_macros)] +macro_rules! json { + // Hide distracting implementation details from the generated rustdoc. + ($($json:tt)+) => { + json_internal!($($json)+) + }; +} + +// Rocket relies on this because they export their own `json!` with a different +// doc comment than ours, and various Rust bugs prevent them from calling our +// `json!` from their `json!` so they call `json_internal!` directly. Check with +// @SergioBenitez before making breaking changes to this macro. +// +// Changes are fine as long as `json_internal!` does not call any new helper +// macros and can still be invoked as `json_internal!($($json)+)`. +#[macro_export(local_inner_macros)] +#[doc(hidden)] +macro_rules! json_internal { + ////////////////////////////////////////////////////////////////////////// + // TT muncher for parsing the inside of an array [...]. Produces a vec![...] + // of the elements. + // + // Must be invoked as: json_internal!(@array [] $($tt)*) + ////////////////////////////////////////////////////////////////////////// + + // Done with trailing comma. + (@array [$($elems:expr,)*]) => { + json_internal_vec![$($elems,)*] + }; + + // Done without trailing comma. + (@array [$($elems:expr),*]) => { + json_internal_vec![$($elems),*] + }; + + // Next element is `null`. + (@array [$($elems:expr,)*] null $($rest:tt)*) => { + json_internal!(@array [$($elems,)* json_internal!(null)] $($rest)*) + }; + + // Next element is `true`. + (@array [$($elems:expr,)*] true $($rest:tt)*) => { + json_internal!(@array [$($elems,)* json_internal!(true)] $($rest)*) + }; + + // Next element is `false`. + (@array [$($elems:expr,)*] false $($rest:tt)*) => { + json_internal!(@array [$($elems,)* json_internal!(false)] $($rest)*) + }; + + // Next element is an array. + (@array [$($elems:expr,)*] [$($array:tt)*] $($rest:tt)*) => { + json_internal!(@array [$($elems,)* json_internal!([$($array)*])] $($rest)*) + }; + + // Next element is a map. + (@array [$($elems:expr,)*] {$($map:tt)*} $($rest:tt)*) => { + json_internal!(@array [$($elems,)* json_internal!({$($map)*})] $($rest)*) + }; + + // Next element is an expression followed by comma. + (@array [$($elems:expr,)*] $next:expr, $($rest:tt)*) => { + json_internal!(@array [$($elems,)* json_internal!($next),] $($rest)*) + }; + + // Last element is an expression with no trailing comma. + (@array [$($elems:expr,)*] $last:expr) => { + json_internal!(@array [$($elems,)* json_internal!($last)]) + }; + + // Comma after the most recent element. + (@array [$($elems:expr),*] , $($rest:tt)*) => { + json_internal!(@array [$($elems,)*] $($rest)*) + }; + + // Unexpected token after most recent element. + (@array [$($elems:expr),*] $unexpected:tt $($rest:tt)*) => { + json_unexpected!($unexpected) + }; + + ////////////////////////////////////////////////////////////////////////// + // TT muncher for parsing the inside of an object {...}. Each entry is + // inserted into the given map variable. + // + // Must be invoked as: json_internal!(@object $map () ($($tt)*) ($($tt)*)) + // + // We require two copies of the input tokens so that we can match on one + // copy and trigger errors on the other copy. + ////////////////////////////////////////////////////////////////////////// + + // Done. + (@object $object:ident () () ()) => {}; + + // Insert the current entry followed by trailing comma. + (@object $object:ident [$($key:tt)+] ($value:expr) , $($rest:tt)*) => { + let _ = $object.insert(($($key)+).into(), $value); + json_internal!(@object $object () ($($rest)*) ($($rest)*)); + }; + + // Current entry followed by unexpected token. + (@object $object:ident [$($key:tt)+] ($value:expr) $unexpected:tt $($rest:tt)*) => { + json_unexpected!($unexpected); + }; + + // Insert the last entry without trailing comma. + (@object $object:ident [$($key:tt)+] ($value:expr)) => { + let _ = $object.insert(($($key)+).into(), $value); + }; + + // Next value is `null`. + (@object $object:ident ($($key:tt)+) (: null $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!(null)) $($rest)*); + }; + + // Next value is `true`. + (@object $object:ident ($($key:tt)+) (: true $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!(true)) $($rest)*); + }; + + // Next value is `false`. + (@object $object:ident ($($key:tt)+) (: false $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!(false)) $($rest)*); + }; + + // Next value is an array. + (@object $object:ident ($($key:tt)+) (: [$($array:tt)*] $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!([$($array)*])) $($rest)*); + }; + + // Next value is a map. + (@object $object:ident ($($key:tt)+) (: {$($map:tt)*} $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!({$($map)*})) $($rest)*); + }; + + // Next value is an expression followed by comma. + (@object $object:ident ($($key:tt)+) (: $value:expr , $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!($value)) , $($rest)*); + }; + + // Last value is an expression with no trailing comma. + (@object $object:ident ($($key:tt)+) (: $value:expr) $copy:tt) => { + json_internal!(@object $object [$($key)+] (json_internal!($value))); + }; + + // Missing value for last entry. Trigger a reasonable error message. + (@object $object:ident ($($key:tt)+) (:) $copy:tt) => { + // "unexpected end of macro invocation" + json_internal!(); + }; + + // Missing colon and value for last entry. Trigger a reasonable error + // message. + (@object $object:ident ($($key:tt)+) () $copy:tt) => { + // "unexpected end of macro invocation" + json_internal!(); + }; + + // Misplaced colon. Trigger a reasonable error message. + (@object $object:ident () (: $($rest:tt)*) ($colon:tt $($copy:tt)*)) => { + // Takes no arguments so "no rules expected the token `:`". + json_unexpected!($colon); + }; + + // Found a comma inside a key. Trigger a reasonable error message. + (@object $object:ident ($($key:tt)*) (, $($rest:tt)*) ($comma:tt $($copy:tt)*)) => { + // Takes no arguments so "no rules expected the token `,`". + json_unexpected!($comma); + }; + + // Key is fully parenthesized. This avoids clippy double_parens false + // positives because the parenthesization may be necessary here. + (@object $object:ident () (($key:expr) : $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object ($key) (: $($rest)*) (: $($rest)*)); + }; + + // Refuse to absorb colon token into key expression. + (@object $object:ident ($($key:tt)*) (: $($unexpected:tt)+) $copy:tt) => { + json_expect_expr_comma!($($unexpected)+); + }; + + // Munch a token into the current key. + (@object $object:ident ($($key:tt)*) ($tt:tt $($rest:tt)*) $copy:tt) => { + json_internal!(@object $object ($($key)* $tt) ($($rest)*) ($($rest)*)); + }; + + ////////////////////////////////////////////////////////////////////////// + // The main implementation. + // + // Must be invoked as: json_internal!($($json)+) + ////////////////////////////////////////////////////////////////////////// + + (null) => { + $crate::Value::Null + }; + + (true) => { + $crate::Value::Bool(true) + }; + + (false) => { + $crate::Value::Bool(false) + }; + + ([]) => { + $crate::Value::Array(json_internal_vec![]) + }; + + ([ $($tt:tt)+ ]) => { + $crate::Value::Array(json_internal!(@array [] $($tt)+)) + }; + + ({}) => { + $crate::Value::Object($crate::Map::new()) + }; + + ({ $($tt:tt)+ }) => { + $crate::Value::Object({ + let mut object = $crate::Map::new(); + json_internal!(@object object () ($($tt)+) ($($tt)+)); + object + }) + }; + + // Any Serialize type: numbers, strings, struct literals, variables etc. + // Must be below every other rule. + ($other:expr) => { + $crate::to_value(&$other).unwrap() + }; +} + +// The json_internal macro above cannot invoke vec directly because it uses +// local_inner_macros. A vec invocation there would resolve to $crate::vec. +// Instead invoke vec here outside of local_inner_macros. +#[macro_export] +#[doc(hidden)] +macro_rules! json_internal_vec { + ($($content:tt)*) => { + vec![$($content)*] + }; +} + +#[macro_export] +#[doc(hidden)] +macro_rules! json_unexpected { + () => {}; +} + +#[macro_export] +#[doc(hidden)] +macro_rules! json_expect_expr_comma { + ($e:expr , $($tt:tt)*) => {}; +} diff --git a/vendor/serde_json/src/map.rs b/vendor/serde_json/src/map.rs new file mode 100644 index 000000000..87cf54566 --- /dev/null +++ b/vendor/serde_json/src/map.rs @@ -0,0 +1,936 @@ +//! A map of String to serde_json::Value. +//! +//! By default the map is backed by a [`BTreeMap`]. Enable the `preserve_order` +//! feature of serde_json to use [`IndexMap`] instead. +//! +//! [`BTreeMap`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html +//! [`IndexMap`]: https://docs.rs/indexmap/*/indexmap/map/struct.IndexMap.html + +use crate::value::Value; +use alloc::string::String; +use core::borrow::Borrow; +use core::fmt::{self, Debug}; +use core::hash::Hash; +use core::iter::{FromIterator, FusedIterator}; +#[cfg(feature = "preserve_order")] +use core::mem; +use core::ops; +use serde::de; + +#[cfg(not(feature = "preserve_order"))] +use alloc::collections::{btree_map, BTreeMap}; +#[cfg(feature = "preserve_order")] +use indexmap::{self, IndexMap}; + +/// Represents a JSON key/value type. +pub struct Map<K, V> { + map: MapImpl<K, V>, +} + +#[cfg(not(feature = "preserve_order"))] +type MapImpl<K, V> = BTreeMap<K, V>; +#[cfg(feature = "preserve_order")] +type MapImpl<K, V> = IndexMap<K, V>; + +impl Map<String, Value> { + /// Makes a new empty Map. + #[inline] + pub fn new() -> Self { + Map { + map: MapImpl::new(), + } + } + + /// Makes a new empty Map with the given initial capacity. + #[inline] + pub fn with_capacity(capacity: usize) -> Self { + Map { + #[cfg(not(feature = "preserve_order"))] + map: { + // does not support with_capacity + let _ = capacity; + BTreeMap::new() + }, + #[cfg(feature = "preserve_order")] + map: IndexMap::with_capacity(capacity), + } + } + + /// Clears the map, removing all values. + #[inline] + pub fn clear(&mut self) { + self.map.clear(); + } + + /// Returns a reference to the value corresponding to the key. + /// + /// The key may be any borrowed form of the map's key type, but the ordering + /// on the borrowed form *must* match the ordering on the key type. + #[inline] + pub fn get<Q>(&self, key: &Q) -> Option<&Value> + where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, + { + self.map.get(key) + } + + /// Returns true if the map contains a value for the specified key. + /// + /// The key may be any borrowed form of the map's key type, but the ordering + /// on the borrowed form *must* match the ordering on the key type. + #[inline] + pub fn contains_key<Q>(&self, key: &Q) -> bool + where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, + { + self.map.contains_key(key) + } + + /// Returns a mutable reference to the value corresponding to the key. + /// + /// The key may be any borrowed form of the map's key type, but the ordering + /// on the borrowed form *must* match the ordering on the key type. + #[inline] + pub fn get_mut<Q>(&mut self, key: &Q) -> Option<&mut Value> + where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, + { + self.map.get_mut(key) + } + + /// Returns the key-value pair matching the given key. + /// + /// The key may be any borrowed form of the map's key type, but the ordering + /// on the borrowed form *must* match the ordering on the key type. + #[inline] + #[cfg(any(feature = "preserve_order", not(no_btreemap_get_key_value)))] + pub fn get_key_value<Q>(&self, key: &Q) -> Option<(&String, &Value)> + where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, + { + self.map.get_key_value(key) + } + + /// Inserts a key-value pair into the map. + /// + /// If the map did not have this key present, `None` is returned. + /// + /// If the map did have this key present, the value is updated, and the old + /// value is returned. + #[inline] + pub fn insert(&mut self, k: String, v: Value) -> Option<Value> { + self.map.insert(k, v) + } + + /// Removes a key from the map, returning the value at the key if the key + /// was previously in the map. + /// + /// The key may be any borrowed form of the map's key type, but the ordering + /// on the borrowed form *must* match the ordering on the key type. + #[inline] + pub fn remove<Q>(&mut self, key: &Q) -> Option<Value> + where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, + { + #[cfg(feature = "preserve_order")] + return self.map.swap_remove(key); + #[cfg(not(feature = "preserve_order"))] + return self.map.remove(key); + } + + /// Removes a key from the map, returning the stored key and value if the + /// key was previously in the map. + /// + /// The key may be any borrowed form of the map's key type, but the ordering + /// on the borrowed form *must* match the ordering on the key type. + pub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(String, Value)> + where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, + { + #[cfg(any(feature = "preserve_order", not(no_btreemap_remove_entry)))] + return self.map.remove_entry(key); + #[cfg(all( + not(feature = "preserve_order"), + no_btreemap_remove_entry, + not(no_btreemap_get_key_value), + ))] + { + let (key, _value) = self.map.get_key_value(key)?; + let key = key.clone(); + let value = self.map.remove::<String>(&key)?; + Some((key, value)) + } + #[cfg(all( + not(feature = "preserve_order"), + no_btreemap_remove_entry, + no_btreemap_get_key_value, + ))] + { + use core::ops::{Bound, RangeBounds}; + + struct Key<'a, Q: ?Sized>(&'a Q); + + impl<'a, Q: ?Sized> RangeBounds<Q> for Key<'a, Q> { + fn start_bound(&self) -> Bound<&Q> { + Bound::Included(self.0) + } + fn end_bound(&self) -> Bound<&Q> { + Bound::Included(self.0) + } + } + + let mut range = self.map.range(Key(key)); + let (key, _value) = range.next()?; + let key = key.clone(); + let value = self.map.remove::<String>(&key)?; + Some((key, value)) + } + } + + /// Moves all elements from other into self, leaving other empty. + #[inline] + pub fn append(&mut self, other: &mut Self) { + #[cfg(feature = "preserve_order")] + for (k, v) in mem::replace(&mut other.map, MapImpl::default()) { + self.map.insert(k, v); + } + #[cfg(not(feature = "preserve_order"))] + self.map.append(&mut other.map); + } + + /// Gets the given key's corresponding entry in the map for in-place + /// manipulation. + pub fn entry<S>(&mut self, key: S) -> Entry + where + S: Into<String>, + { + #[cfg(not(feature = "preserve_order"))] + use alloc::collections::btree_map::Entry as EntryImpl; + #[cfg(feature = "preserve_order")] + use indexmap::map::Entry as EntryImpl; + + match self.map.entry(key.into()) { + EntryImpl::Vacant(vacant) => Entry::Vacant(VacantEntry { vacant }), + EntryImpl::Occupied(occupied) => Entry::Occupied(OccupiedEntry { occupied }), + } + } + + /// Returns the number of elements in the map. + #[inline] + pub fn len(&self) -> usize { + self.map.len() + } + + /// Returns true if the map contains no elements. + #[inline] + pub fn is_empty(&self) -> bool { + self.map.is_empty() + } + + /// Gets an iterator over the entries of the map. + #[inline] + pub fn iter(&self) -> Iter { + Iter { + iter: self.map.iter(), + } + } + + /// Gets a mutable iterator over the entries of the map. + #[inline] + pub fn iter_mut(&mut self) -> IterMut { + IterMut { + iter: self.map.iter_mut(), + } + } + + /// Gets an iterator over the keys of the map. + #[inline] + pub fn keys(&self) -> Keys { + Keys { + iter: self.map.keys(), + } + } + + /// Gets an iterator over the values of the map. + #[inline] + pub fn values(&self) -> Values { + Values { + iter: self.map.values(), + } + } + + /// Gets an iterator over mutable values of the map. + #[inline] + pub fn values_mut(&mut self) -> ValuesMut { + ValuesMut { + iter: self.map.values_mut(), + } + } + + /// Retains only the elements specified by the predicate. + /// + /// In other words, remove all pairs `(k, v)` such that `f(&k, &mut v)` + /// returns `false`. + #[cfg(not(no_btreemap_retain))] + #[inline] + pub fn retain<F>(&mut self, f: F) + where + F: FnMut(&String, &mut Value) -> bool, + { + self.map.retain(f); + } +} + +#[allow(clippy::derivable_impls)] // clippy bug: https://github.com/rust-lang/rust-clippy/issues/7655 +impl Default for Map<String, Value> { + #[inline] + fn default() -> Self { + Map { + map: MapImpl::new(), + } + } +} + +impl Clone for Map<String, Value> { + #[inline] + fn clone(&self) -> Self { + Map { + map: self.map.clone(), + } + } +} + +impl PartialEq for Map<String, Value> { + #[inline] + fn eq(&self, other: &Self) -> bool { + self.map.eq(&other.map) + } +} + +impl Eq for Map<String, Value> {} + +/// Access an element of this map. Panics if the given key is not present in the +/// map. +/// +/// ``` +/// # use serde_json::Value; +/// # +/// # let val = &Value::String("".to_owned()); +/// # let _ = +/// match val { +/// Value::String(s) => Some(s.as_str()), +/// Value::Array(arr) => arr[0].as_str(), +/// Value::Object(map) => map["type"].as_str(), +/// _ => None, +/// } +/// # ; +/// ``` +impl<'a, Q> ops::Index<&'a Q> for Map<String, Value> +where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, +{ + type Output = Value; + + fn index(&self, index: &Q) -> &Value { + self.map.index(index) + } +} + +/// Mutably access an element of this map. Panics if the given key is not +/// present in the map. +/// +/// ``` +/// # use serde_json::json; +/// # +/// # let mut map = serde_json::Map::new(); +/// # map.insert("key".to_owned(), serde_json::Value::Null); +/// # +/// map["key"] = json!("value"); +/// ``` +impl<'a, Q> ops::IndexMut<&'a Q> for Map<String, Value> +where + String: Borrow<Q>, + Q: ?Sized + Ord + Eq + Hash, +{ + fn index_mut(&mut self, index: &Q) -> &mut Value { + self.map.get_mut(index).expect("no entry found for key") + } +} + +impl Debug for Map<String, Value> { + #[inline] + fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> { + self.map.fmt(formatter) + } +} + +#[cfg(any(feature = "std", feature = "alloc"))] +impl serde::ser::Serialize for Map<String, Value> { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: serde::ser::Serializer, + { + use serde::ser::SerializeMap; + let mut map = tri!(serializer.serialize_map(Some(self.len()))); + for (k, v) in self { + tri!(map.serialize_entry(k, v)); + } + map.end() + } +} + +impl<'de> de::Deserialize<'de> for Map<String, Value> { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: de::Deserializer<'de>, + { + struct Visitor; + + impl<'de> de::Visitor<'de> for Visitor { + type Value = Map<String, Value>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a map") + } + + #[inline] + fn visit_unit<E>(self) -> Result<Self::Value, E> + where + E: de::Error, + { + Ok(Map::new()) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + #[inline] + fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> + where + V: de::MapAccess<'de>, + { + let mut values = Map::new(); + + while let Some((key, value)) = tri!(visitor.next_entry()) { + values.insert(key, value); + } + + Ok(values) + } + } + + deserializer.deserialize_map(Visitor) + } +} + +impl FromIterator<(String, Value)> for Map<String, Value> { + fn from_iter<T>(iter: T) -> Self + where + T: IntoIterator<Item = (String, Value)>, + { + Map { + map: FromIterator::from_iter(iter), + } + } +} + +impl Extend<(String, Value)> for Map<String, Value> { + fn extend<T>(&mut self, iter: T) + where + T: IntoIterator<Item = (String, Value)>, + { + self.map.extend(iter); + } +} + +macro_rules! delegate_iterator { + (($name:ident $($generics:tt)*) => $item:ty) => { + impl $($generics)* Iterator for $name $($generics)* { + type Item = $item; + #[inline] + fn next(&mut self) -> Option<Self::Item> { + self.iter.next() + } + #[inline] + fn size_hint(&self) -> (usize, Option<usize>) { + self.iter.size_hint() + } + } + + impl $($generics)* DoubleEndedIterator for $name $($generics)* { + #[inline] + fn next_back(&mut self) -> Option<Self::Item> { + self.iter.next_back() + } + } + + impl $($generics)* ExactSizeIterator for $name $($generics)* { + #[inline] + fn len(&self) -> usize { + self.iter.len() + } + } + + impl $($generics)* FusedIterator for $name $($generics)* {} + } +} + +////////////////////////////////////////////////////////////////////////////// + +/// A view into a single entry in a map, which may either be vacant or occupied. +/// This enum is constructed from the [`entry`] method on [`Map`]. +/// +/// [`entry`]: struct.Map.html#method.entry +/// [`Map`]: struct.Map.html +pub enum Entry<'a> { + /// A vacant Entry. + Vacant(VacantEntry<'a>), + /// An occupied Entry. + Occupied(OccupiedEntry<'a>), +} + +/// A vacant Entry. It is part of the [`Entry`] enum. +/// +/// [`Entry`]: enum.Entry.html +pub struct VacantEntry<'a> { + vacant: VacantEntryImpl<'a>, +} + +/// An occupied Entry. It is part of the [`Entry`] enum. +/// +/// [`Entry`]: enum.Entry.html +pub struct OccupiedEntry<'a> { + occupied: OccupiedEntryImpl<'a>, +} + +#[cfg(not(feature = "preserve_order"))] +type VacantEntryImpl<'a> = btree_map::VacantEntry<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type VacantEntryImpl<'a> = indexmap::map::VacantEntry<'a, String, Value>; + +#[cfg(not(feature = "preserve_order"))] +type OccupiedEntryImpl<'a> = btree_map::OccupiedEntry<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type OccupiedEntryImpl<'a> = indexmap::map::OccupiedEntry<'a, String, Value>; + +impl<'a> Entry<'a> { + /// Returns a reference to this entry's key. + /// + /// # Examples + /// + /// ``` + /// let mut map = serde_json::Map::new(); + /// assert_eq!(map.entry("serde").key(), &"serde"); + /// ``` + pub fn key(&self) -> &String { + match self { + Entry::Vacant(e) => e.key(), + Entry::Occupied(e) => e.key(), + } + } + + /// Ensures a value is in the entry by inserting the default if empty, and + /// returns a mutable reference to the value in the entry. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut map = serde_json::Map::new(); + /// map.entry("serde").or_insert(json!(12)); + /// + /// assert_eq!(map["serde"], 12); + /// ``` + pub fn or_insert(self, default: Value) -> &'a mut Value { + match self { + Entry::Vacant(entry) => entry.insert(default), + Entry::Occupied(entry) => entry.into_mut(), + } + } + + /// Ensures a value is in the entry by inserting the result of the default + /// function if empty, and returns a mutable reference to the value in the + /// entry. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut map = serde_json::Map::new(); + /// map.entry("serde").or_insert_with(|| json!("hoho")); + /// + /// assert_eq!(map["serde"], "hoho".to_owned()); + /// ``` + pub fn or_insert_with<F>(self, default: F) -> &'a mut Value + where + F: FnOnce() -> Value, + { + match self { + Entry::Vacant(entry) => entry.insert(default()), + Entry::Occupied(entry) => entry.into_mut(), + } + } + + /// Provides in-place mutable access to an occupied entry before any + /// potential inserts into the map. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut map = serde_json::Map::new(); + /// map.entry("serde") + /// .and_modify(|e| *e = json!("rust")) + /// .or_insert(json!("cpp")); + /// + /// assert_eq!(map["serde"], "cpp"); + /// + /// map.entry("serde") + /// .and_modify(|e| *e = json!("rust")) + /// .or_insert(json!("cpp")); + /// + /// assert_eq!(map["serde"], "rust"); + /// ``` + pub fn and_modify<F>(self, f: F) -> Self + where + F: FnOnce(&mut Value), + { + match self { + Entry::Occupied(mut entry) => { + f(entry.get_mut()); + Entry::Occupied(entry) + } + Entry::Vacant(entry) => Entry::Vacant(entry), + } + } +} + +impl<'a> VacantEntry<'a> { + /// Gets a reference to the key that would be used when inserting a value + /// through the VacantEntry. + /// + /// # Examples + /// + /// ``` + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// + /// match map.entry("serde") { + /// Entry::Vacant(vacant) => { + /// assert_eq!(vacant.key(), &"serde"); + /// } + /// Entry::Occupied(_) => unimplemented!(), + /// } + /// ``` + #[inline] + pub fn key(&self) -> &String { + self.vacant.key() + } + + /// Sets the value of the entry with the VacantEntry's key, and returns a + /// mutable reference to it. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// + /// match map.entry("serde") { + /// Entry::Vacant(vacant) => { + /// vacant.insert(json!("hoho")); + /// } + /// Entry::Occupied(_) => unimplemented!(), + /// } + /// ``` + #[inline] + pub fn insert(self, value: Value) -> &'a mut Value { + self.vacant.insert(value) + } +} + +impl<'a> OccupiedEntry<'a> { + /// Gets a reference to the key in the entry. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// map.insert("serde".to_owned(), json!(12)); + /// + /// match map.entry("serde") { + /// Entry::Occupied(occupied) => { + /// assert_eq!(occupied.key(), &"serde"); + /// } + /// Entry::Vacant(_) => unimplemented!(), + /// } + /// ``` + #[inline] + pub fn key(&self) -> &String { + self.occupied.key() + } + + /// Gets a reference to the value in the entry. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// map.insert("serde".to_owned(), json!(12)); + /// + /// match map.entry("serde") { + /// Entry::Occupied(occupied) => { + /// assert_eq!(occupied.get(), 12); + /// } + /// Entry::Vacant(_) => unimplemented!(), + /// } + /// ``` + #[inline] + pub fn get(&self) -> &Value { + self.occupied.get() + } + + /// Gets a mutable reference to the value in the entry. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// map.insert("serde".to_owned(), json!([1, 2, 3])); + /// + /// match map.entry("serde") { + /// Entry::Occupied(mut occupied) => { + /// occupied.get_mut().as_array_mut().unwrap().push(json!(4)); + /// } + /// Entry::Vacant(_) => unimplemented!(), + /// } + /// + /// assert_eq!(map["serde"].as_array().unwrap().len(), 4); + /// ``` + #[inline] + pub fn get_mut(&mut self) -> &mut Value { + self.occupied.get_mut() + } + + /// Converts the entry into a mutable reference to its value. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// map.insert("serde".to_owned(), json!([1, 2, 3])); + /// + /// match map.entry("serde") { + /// Entry::Occupied(mut occupied) => { + /// occupied.into_mut().as_array_mut().unwrap().push(json!(4)); + /// } + /// Entry::Vacant(_) => unimplemented!(), + /// } + /// + /// assert_eq!(map["serde"].as_array().unwrap().len(), 4); + /// ``` + #[inline] + pub fn into_mut(self) -> &'a mut Value { + self.occupied.into_mut() + } + + /// Sets the value of the entry with the `OccupiedEntry`'s key, and returns + /// the entry's old value. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// map.insert("serde".to_owned(), json!(12)); + /// + /// match map.entry("serde") { + /// Entry::Occupied(mut occupied) => { + /// assert_eq!(occupied.insert(json!(13)), 12); + /// assert_eq!(occupied.get(), 13); + /// } + /// Entry::Vacant(_) => unimplemented!(), + /// } + /// ``` + #[inline] + pub fn insert(&mut self, value: Value) -> Value { + self.occupied.insert(value) + } + + /// Takes the value of the entry out of the map, and returns it. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// use serde_json::map::Entry; + /// + /// let mut map = serde_json::Map::new(); + /// map.insert("serde".to_owned(), json!(12)); + /// + /// match map.entry("serde") { + /// Entry::Occupied(occupied) => { + /// assert_eq!(occupied.remove(), 12); + /// } + /// Entry::Vacant(_) => unimplemented!(), + /// } + /// ``` + #[inline] + pub fn remove(self) -> Value { + #[cfg(feature = "preserve_order")] + return self.occupied.swap_remove(); + #[cfg(not(feature = "preserve_order"))] + return self.occupied.remove(); + } +} + +////////////////////////////////////////////////////////////////////////////// + +impl<'a> IntoIterator for &'a Map<String, Value> { + type Item = (&'a String, &'a Value); + type IntoIter = Iter<'a>; + #[inline] + fn into_iter(self) -> Self::IntoIter { + Iter { + iter: self.map.iter(), + } + } +} + +/// An iterator over a serde_json::Map's entries. +pub struct Iter<'a> { + iter: IterImpl<'a>, +} + +#[cfg(not(feature = "preserve_order"))] +type IterImpl<'a> = btree_map::Iter<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type IterImpl<'a> = indexmap::map::Iter<'a, String, Value>; + +delegate_iterator!((Iter<'a>) => (&'a String, &'a Value)); + +////////////////////////////////////////////////////////////////////////////// + +impl<'a> IntoIterator for &'a mut Map<String, Value> { + type Item = (&'a String, &'a mut Value); + type IntoIter = IterMut<'a>; + #[inline] + fn into_iter(self) -> Self::IntoIter { + IterMut { + iter: self.map.iter_mut(), + } + } +} + +/// A mutable iterator over a serde_json::Map's entries. +pub struct IterMut<'a> { + iter: IterMutImpl<'a>, +} + +#[cfg(not(feature = "preserve_order"))] +type IterMutImpl<'a> = btree_map::IterMut<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type IterMutImpl<'a> = indexmap::map::IterMut<'a, String, Value>; + +delegate_iterator!((IterMut<'a>) => (&'a String, &'a mut Value)); + +////////////////////////////////////////////////////////////////////////////// + +impl IntoIterator for Map<String, Value> { + type Item = (String, Value); + type IntoIter = IntoIter; + #[inline] + fn into_iter(self) -> Self::IntoIter { + IntoIter { + iter: self.map.into_iter(), + } + } +} + +/// An owning iterator over a serde_json::Map's entries. +pub struct IntoIter { + iter: IntoIterImpl, +} + +#[cfg(not(feature = "preserve_order"))] +type IntoIterImpl = btree_map::IntoIter<String, Value>; +#[cfg(feature = "preserve_order")] +type IntoIterImpl = indexmap::map::IntoIter<String, Value>; + +delegate_iterator!((IntoIter) => (String, Value)); + +////////////////////////////////////////////////////////////////////////////// + +/// An iterator over a serde_json::Map's keys. +pub struct Keys<'a> { + iter: KeysImpl<'a>, +} + +#[cfg(not(feature = "preserve_order"))] +type KeysImpl<'a> = btree_map::Keys<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type KeysImpl<'a> = indexmap::map::Keys<'a, String, Value>; + +delegate_iterator!((Keys<'a>) => &'a String); + +////////////////////////////////////////////////////////////////////////////// + +/// An iterator over a serde_json::Map's values. +pub struct Values<'a> { + iter: ValuesImpl<'a>, +} + +#[cfg(not(feature = "preserve_order"))] +type ValuesImpl<'a> = btree_map::Values<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type ValuesImpl<'a> = indexmap::map::Values<'a, String, Value>; + +delegate_iterator!((Values<'a>) => &'a Value); + +////////////////////////////////////////////////////////////////////////////// + +/// A mutable iterator over a serde_json::Map's values. +pub struct ValuesMut<'a> { + iter: ValuesMutImpl<'a>, +} + +#[cfg(not(feature = "preserve_order"))] +type ValuesMutImpl<'a> = btree_map::ValuesMut<'a, String, Value>; +#[cfg(feature = "preserve_order")] +type ValuesMutImpl<'a> = indexmap::map::ValuesMut<'a, String, Value>; + +delegate_iterator!((ValuesMut<'a>) => &'a mut Value); diff --git a/vendor/serde_json/src/number.rs b/vendor/serde_json/src/number.rs new file mode 100644 index 000000000..b965271fd --- /dev/null +++ b/vendor/serde_json/src/number.rs @@ -0,0 +1,782 @@ +use crate::de::ParserNumber; +use crate::error::Error; +use core::fmt::{self, Debug, Display}; +#[cfg(not(feature = "arbitrary_precision"))] +use core::hash::{Hash, Hasher}; +use serde::de::{self, Unexpected, Visitor}; +use serde::{ + forward_to_deserialize_any, serde_if_integer128, Deserialize, Deserializer, Serialize, + Serializer, +}; + +#[cfg(feature = "arbitrary_precision")] +use crate::error::ErrorCode; +#[cfg(feature = "arbitrary_precision")] +use serde::de::{IntoDeserializer, MapAccess}; + +#[cfg(feature = "arbitrary_precision")] +pub(crate) const TOKEN: &str = "$serde_json::private::Number"; + +/// Represents a JSON number, whether integer or floating point. +#[derive(Clone, PartialEq, Eq, Hash)] +pub struct Number { + n: N, +} + +#[cfg(not(feature = "arbitrary_precision"))] +#[derive(Copy, Clone)] +enum N { + PosInt(u64), + /// Always less than zero. + NegInt(i64), + /// Always finite. + Float(f64), +} + +#[cfg(not(feature = "arbitrary_precision"))] +impl PartialEq for N { + fn eq(&self, other: &Self) -> bool { + match (self, other) { + (N::PosInt(a), N::PosInt(b)) => a == b, + (N::NegInt(a), N::NegInt(b)) => a == b, + (N::Float(a), N::Float(b)) => a == b, + _ => false, + } + } +} + +// Implementing Eq is fine since any float values are always finite. +#[cfg(not(feature = "arbitrary_precision"))] +impl Eq for N {} + +#[cfg(not(feature = "arbitrary_precision"))] +impl Hash for N { + fn hash<H: Hasher>(&self, h: &mut H) { + match *self { + N::PosInt(i) => i.hash(h), + N::NegInt(i) => i.hash(h), + N::Float(f) => { + if f == 0.0f64 { + // There are 2 zero representations, +0 and -0, which + // compare equal but have different bits. We use the +0 hash + // for both so that hash(+0) == hash(-0). + 0.0f64.to_bits().hash(h); + } else { + f.to_bits().hash(h); + } + } + } + } +} + +#[cfg(feature = "arbitrary_precision")] +type N = String; + +impl Number { + /// Returns true if the `Number` is an integer between `i64::MIN` and + /// `i64::MAX`. + /// + /// For any Number on which `is_i64` returns true, `as_i64` is guaranteed to + /// return the integer value. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let big = i64::max_value() as u64 + 10; + /// let v = json!({ "a": 64, "b": big, "c": 256.0 }); + /// + /// assert!(v["a"].is_i64()); + /// + /// // Greater than i64::MAX. + /// assert!(!v["b"].is_i64()); + /// + /// // Numbers with a decimal point are not considered integers. + /// assert!(!v["c"].is_i64()); + /// ``` + #[inline] + pub fn is_i64(&self) -> bool { + #[cfg(not(feature = "arbitrary_precision"))] + match self.n { + N::PosInt(v) => v <= i64::max_value() as u64, + N::NegInt(_) => true, + N::Float(_) => false, + } + #[cfg(feature = "arbitrary_precision")] + self.as_i64().is_some() + } + + /// Returns true if the `Number` is an integer between zero and `u64::MAX`. + /// + /// For any Number on which `is_u64` returns true, `as_u64` is guaranteed to + /// return the integer value. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 64, "b": -64, "c": 256.0 }); + /// + /// assert!(v["a"].is_u64()); + /// + /// // Negative integer. + /// assert!(!v["b"].is_u64()); + /// + /// // Numbers with a decimal point are not considered integers. + /// assert!(!v["c"].is_u64()); + /// ``` + #[inline] + pub fn is_u64(&self) -> bool { + #[cfg(not(feature = "arbitrary_precision"))] + match self.n { + N::PosInt(_) => true, + N::NegInt(_) | N::Float(_) => false, + } + #[cfg(feature = "arbitrary_precision")] + self.as_u64().is_some() + } + + /// Returns true if the `Number` can be represented by f64. + /// + /// For any Number on which `is_f64` returns true, `as_f64` is guaranteed to + /// return the floating point value. + /// + /// Currently this function returns true if and only if both `is_i64` and + /// `is_u64` return false but this is not a guarantee in the future. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 256.0, "b": 64, "c": -64 }); + /// + /// assert!(v["a"].is_f64()); + /// + /// // Integers. + /// assert!(!v["b"].is_f64()); + /// assert!(!v["c"].is_f64()); + /// ``` + #[inline] + pub fn is_f64(&self) -> bool { + #[cfg(not(feature = "arbitrary_precision"))] + match self.n { + N::Float(_) => true, + N::PosInt(_) | N::NegInt(_) => false, + } + #[cfg(feature = "arbitrary_precision")] + { + for c in self.n.chars() { + if c == '.' || c == 'e' || c == 'E' { + return self.n.parse::<f64>().ok().map_or(false, f64::is_finite); + } + } + false + } + } + + /// If the `Number` is an integer, represent it as i64 if possible. Returns + /// None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let big = i64::max_value() as u64 + 10; + /// let v = json!({ "a": 64, "b": big, "c": 256.0 }); + /// + /// assert_eq!(v["a"].as_i64(), Some(64)); + /// assert_eq!(v["b"].as_i64(), None); + /// assert_eq!(v["c"].as_i64(), None); + /// ``` + #[inline] + pub fn as_i64(&self) -> Option<i64> { + #[cfg(not(feature = "arbitrary_precision"))] + match self.n { + N::PosInt(n) => { + if n <= i64::max_value() as u64 { + Some(n as i64) + } else { + None + } + } + N::NegInt(n) => Some(n), + N::Float(_) => None, + } + #[cfg(feature = "arbitrary_precision")] + self.n.parse().ok() + } + + /// If the `Number` is an integer, represent it as u64 if possible. Returns + /// None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 64, "b": -64, "c": 256.0 }); + /// + /// assert_eq!(v["a"].as_u64(), Some(64)); + /// assert_eq!(v["b"].as_u64(), None); + /// assert_eq!(v["c"].as_u64(), None); + /// ``` + #[inline] + pub fn as_u64(&self) -> Option<u64> { + #[cfg(not(feature = "arbitrary_precision"))] + match self.n { + N::PosInt(n) => Some(n), + N::NegInt(_) | N::Float(_) => None, + } + #[cfg(feature = "arbitrary_precision")] + self.n.parse().ok() + } + + /// Represents the number as f64 if possible. Returns None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 256.0, "b": 64, "c": -64 }); + /// + /// assert_eq!(v["a"].as_f64(), Some(256.0)); + /// assert_eq!(v["b"].as_f64(), Some(64.0)); + /// assert_eq!(v["c"].as_f64(), Some(-64.0)); + /// ``` + #[inline] + pub fn as_f64(&self) -> Option<f64> { + #[cfg(not(feature = "arbitrary_precision"))] + match self.n { + N::PosInt(n) => Some(n as f64), + N::NegInt(n) => Some(n as f64), + N::Float(n) => Some(n), + } + #[cfg(feature = "arbitrary_precision")] + self.n.parse::<f64>().ok().filter(|float| float.is_finite()) + } + + /// Converts a finite `f64` to a `Number`. Infinite or NaN values are not JSON + /// numbers. + /// + /// ``` + /// # use std::f64; + /// # + /// # use serde_json::Number; + /// # + /// assert!(Number::from_f64(256.0).is_some()); + /// + /// assert!(Number::from_f64(f64::NAN).is_none()); + /// ``` + #[inline] + pub fn from_f64(f: f64) -> Option<Number> { + if f.is_finite() { + let n = { + #[cfg(not(feature = "arbitrary_precision"))] + { + N::Float(f) + } + #[cfg(feature = "arbitrary_precision")] + { + ryu::Buffer::new().format_finite(f).to_owned() + } + }; + Some(Number { n }) + } else { + None + } + } + + #[cfg(feature = "arbitrary_precision")] + /// Not public API. Only tests use this. + #[doc(hidden)] + #[inline] + pub fn from_string_unchecked(n: String) -> Self { + Number { n } + } +} + +impl Display for Number { + #[cfg(not(feature = "arbitrary_precision"))] + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + match self.n { + N::PosInt(u) => Display::fmt(&u, formatter), + N::NegInt(i) => Display::fmt(&i, formatter), + N::Float(f) => Display::fmt(&f, formatter), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + Display::fmt(&self.n, formatter) + } +} + +impl Debug for Number { + #[cfg(not(feature = "arbitrary_precision"))] + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + let mut debug = formatter.debug_tuple("Number"); + match self.n { + N::PosInt(i) => { + debug.field(&i); + } + N::NegInt(i) => { + debug.field(&i); + } + N::Float(f) => { + debug.field(&f); + } + } + debug.finish() + } + + #[cfg(feature = "arbitrary_precision")] + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_tuple("Number") + .field(&format_args!("{}", self.n)) + .finish() + } +} + +impl Serialize for Number { + #[cfg(not(feature = "arbitrary_precision"))] + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + match self.n { + N::PosInt(u) => serializer.serialize_u64(u), + N::NegInt(i) => serializer.serialize_i64(i), + N::Float(f) => serializer.serialize_f64(f), + } + } + + #[cfg(feature = "arbitrary_precision")] + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + use serde::ser::SerializeStruct; + + let mut s = serializer.serialize_struct(TOKEN, 1)?; + s.serialize_field(TOKEN, &self.n)?; + s.end() + } +} + +impl<'de> Deserialize<'de> for Number { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Number, D::Error> + where + D: Deserializer<'de>, + { + struct NumberVisitor; + + impl<'de> Visitor<'de> for NumberVisitor { + type Value = Number; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a JSON number") + } + + #[inline] + fn visit_i64<E>(self, value: i64) -> Result<Number, E> { + Ok(value.into()) + } + + #[inline] + fn visit_u64<E>(self, value: u64) -> Result<Number, E> { + Ok(value.into()) + } + + #[inline] + fn visit_f64<E>(self, value: f64) -> Result<Number, E> + where + E: de::Error, + { + Number::from_f64(value).ok_or_else(|| de::Error::custom("not a JSON number")) + } + + #[cfg(feature = "arbitrary_precision")] + #[inline] + fn visit_map<V>(self, mut visitor: V) -> Result<Number, V::Error> + where + V: de::MapAccess<'de>, + { + let value = visitor.next_key::<NumberKey>()?; + if value.is_none() { + return Err(de::Error::invalid_type(Unexpected::Map, &self)); + } + let v: NumberFromString = visitor.next_value()?; + Ok(v.value) + } + } + + deserializer.deserialize_any(NumberVisitor) + } +} + +#[cfg(feature = "arbitrary_precision")] +struct NumberKey; + +#[cfg(feature = "arbitrary_precision")] +impl<'de> de::Deserialize<'de> for NumberKey { + fn deserialize<D>(deserializer: D) -> Result<NumberKey, D::Error> + where + D: de::Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> de::Visitor<'de> for FieldVisitor { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a valid number field") + } + + fn visit_str<E>(self, s: &str) -> Result<(), E> + where + E: de::Error, + { + if s == TOKEN { + Ok(()) + } else { + Err(de::Error::custom("expected field with custom name")) + } + } + } + + deserializer.deserialize_identifier(FieldVisitor)?; + Ok(NumberKey) + } +} + +#[cfg(feature = "arbitrary_precision")] +pub struct NumberFromString { + pub value: Number, +} + +#[cfg(feature = "arbitrary_precision")] +impl<'de> de::Deserialize<'de> for NumberFromString { + fn deserialize<D>(deserializer: D) -> Result<NumberFromString, D::Error> + where + D: de::Deserializer<'de>, + { + struct Visitor; + + impl<'de> de::Visitor<'de> for Visitor { + type Value = NumberFromString; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("string containing a number") + } + + fn visit_str<E>(self, s: &str) -> Result<NumberFromString, E> + where + E: de::Error, + { + let n = tri!(s.parse().map_err(de::Error::custom)); + Ok(NumberFromString { value: n }) + } + } + + deserializer.deserialize_str(Visitor) + } +} + +#[cfg(feature = "arbitrary_precision")] +fn invalid_number() -> Error { + Error::syntax(ErrorCode::InvalidNumber, 0, 0) +} + +macro_rules! deserialize_any { + (@expand [$($num_string:tt)*]) => { + #[cfg(not(feature = "arbitrary_precision"))] + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self.n { + N::PosInt(u) => visitor.visit_u64(u), + N::NegInt(i) => visitor.visit_i64(i), + N::Float(f) => visitor.visit_f64(f), + } + } + + #[cfg(feature = "arbitrary_precision")] + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where V: Visitor<'de> + { + if let Some(u) = self.as_u64() { + return visitor.visit_u64(u); + } else if let Some(i) = self.as_i64() { + return visitor.visit_i64(i); + } else if let Some(f) = self.as_f64() { + if ryu::Buffer::new().format_finite(f) == self.n || f.to_string() == self.n { + return visitor.visit_f64(f); + } + } + + visitor.visit_map(NumberDeserializer { + number: Some(self.$($num_string)*), + }) + } + }; + + (owned) => { + deserialize_any!(@expand [n]); + }; + + (ref) => { + deserialize_any!(@expand [n.clone()]); + }; +} + +macro_rules! deserialize_number { + ($deserialize:ident => $visit:ident) => { + #[cfg(not(feature = "arbitrary_precision"))] + fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_any(visitor) + } + + #[cfg(feature = "arbitrary_precision")] + fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + visitor.$visit(self.n.parse().map_err(|_| invalid_number())?) + } + }; +} + +impl<'de> Deserializer<'de> for Number { + type Error = Error; + + deserialize_any!(owned); + + deserialize_number!(deserialize_i8 => visit_i8); + deserialize_number!(deserialize_i16 => visit_i16); + deserialize_number!(deserialize_i32 => visit_i32); + deserialize_number!(deserialize_i64 => visit_i64); + deserialize_number!(deserialize_u8 => visit_u8); + deserialize_number!(deserialize_u16 => visit_u16); + deserialize_number!(deserialize_u32 => visit_u32); + deserialize_number!(deserialize_u64 => visit_u64); + deserialize_number!(deserialize_f32 => visit_f32); + deserialize_number!(deserialize_f64 => visit_f64); + + serde_if_integer128! { + deserialize_number!(deserialize_i128 => visit_i128); + deserialize_number!(deserialize_u128 => visit_u128); + } + + forward_to_deserialize_any! { + bool char str string bytes byte_buf option unit unit_struct + newtype_struct seq tuple tuple_struct map struct enum identifier + ignored_any + } +} + +impl<'de, 'a> Deserializer<'de> for &'a Number { + type Error = Error; + + deserialize_any!(ref); + + deserialize_number!(deserialize_i8 => visit_i8); + deserialize_number!(deserialize_i16 => visit_i16); + deserialize_number!(deserialize_i32 => visit_i32); + deserialize_number!(deserialize_i64 => visit_i64); + deserialize_number!(deserialize_u8 => visit_u8); + deserialize_number!(deserialize_u16 => visit_u16); + deserialize_number!(deserialize_u32 => visit_u32); + deserialize_number!(deserialize_u64 => visit_u64); + deserialize_number!(deserialize_f32 => visit_f32); + deserialize_number!(deserialize_f64 => visit_f64); + + serde_if_integer128! { + deserialize_number!(deserialize_i128 => visit_i128); + deserialize_number!(deserialize_u128 => visit_u128); + } + + forward_to_deserialize_any! { + bool char str string bytes byte_buf option unit unit_struct + newtype_struct seq tuple tuple_struct map struct enum identifier + ignored_any + } +} + +#[cfg(feature = "arbitrary_precision")] +pub(crate) struct NumberDeserializer { + pub number: Option<String>, +} + +#[cfg(feature = "arbitrary_precision")] +impl<'de> MapAccess<'de> for NumberDeserializer { + type Error = Error; + + fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error> + where + K: de::DeserializeSeed<'de>, + { + if self.number.is_none() { + return Ok(None); + } + seed.deserialize(NumberFieldDeserializer).map(Some) + } + + fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error> + where + V: de::DeserializeSeed<'de>, + { + seed.deserialize(self.number.take().unwrap().into_deserializer()) + } +} + +#[cfg(feature = "arbitrary_precision")] +struct NumberFieldDeserializer; + +#[cfg(feature = "arbitrary_precision")] +impl<'de> Deserializer<'de> for NumberFieldDeserializer { + type Error = Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + visitor.visit_borrowed_str(TOKEN) + } + + forward_to_deserialize_any! { + bool u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 f32 f64 char str string seq + bytes byte_buf map struct option unit newtype_struct ignored_any + unit_struct tuple_struct tuple enum identifier + } +} + +impl From<ParserNumber> for Number { + fn from(value: ParserNumber) -> Self { + let n = match value { + ParserNumber::F64(f) => { + #[cfg(not(feature = "arbitrary_precision"))] + { + N::Float(f) + } + #[cfg(feature = "arbitrary_precision")] + { + f.to_string() + } + } + ParserNumber::U64(u) => { + #[cfg(not(feature = "arbitrary_precision"))] + { + N::PosInt(u) + } + #[cfg(feature = "arbitrary_precision")] + { + u.to_string() + } + } + ParserNumber::I64(i) => { + #[cfg(not(feature = "arbitrary_precision"))] + { + N::NegInt(i) + } + #[cfg(feature = "arbitrary_precision")] + { + i.to_string() + } + } + #[cfg(feature = "arbitrary_precision")] + ParserNumber::String(s) => s, + }; + Number { n } + } +} + +macro_rules! impl_from_unsigned { + ( + $($ty:ty),* + ) => { + $( + impl From<$ty> for Number { + #[inline] + fn from(u: $ty) -> Self { + let n = { + #[cfg(not(feature = "arbitrary_precision"))] + { N::PosInt(u as u64) } + #[cfg(feature = "arbitrary_precision")] + { + itoa::Buffer::new().format(u).to_owned() + } + }; + Number { n } + } + } + )* + }; +} + +macro_rules! impl_from_signed { + ( + $($ty:ty),* + ) => { + $( + impl From<$ty> for Number { + #[inline] + fn from(i: $ty) -> Self { + let n = { + #[cfg(not(feature = "arbitrary_precision"))] + { + if i < 0 { + N::NegInt(i as i64) + } else { + N::PosInt(i as u64) + } + } + #[cfg(feature = "arbitrary_precision")] + { + itoa::Buffer::new().format(i).to_owned() + } + }; + Number { n } + } + } + )* + }; +} + +impl_from_unsigned!(u8, u16, u32, u64, usize); +impl_from_signed!(i8, i16, i32, i64, isize); + +#[cfg(feature = "arbitrary_precision")] +serde_if_integer128! { + impl From<i128> for Number { + fn from(i: i128) -> Self { + Number { n: i.to_string() } + } + } + + impl From<u128> for Number { + fn from(u: u128) -> Self { + Number { n: u.to_string() } + } + } +} + +impl Number { + #[cfg(not(feature = "arbitrary_precision"))] + #[cold] + pub(crate) fn unexpected(&self) -> Unexpected { + match self.n { + N::PosInt(u) => Unexpected::Unsigned(u), + N::NegInt(i) => Unexpected::Signed(i), + N::Float(f) => Unexpected::Float(f), + } + } + + #[cfg(feature = "arbitrary_precision")] + #[cold] + pub(crate) fn unexpected(&self) -> Unexpected { + Unexpected::Other("number") + } +} diff --git a/vendor/serde_json/src/raw.rs b/vendor/serde_json/src/raw.rs new file mode 100644 index 000000000..c8377ac82 --- /dev/null +++ b/vendor/serde_json/src/raw.rs @@ -0,0 +1,531 @@ +use crate::error::Error; +use alloc::borrow::ToOwned; +use alloc::boxed::Box; +use alloc::string::String; +use core::fmt::{self, Debug, Display}; +use core::mem; +use serde::de::value::BorrowedStrDeserializer; +use serde::de::{ + self, Deserialize, DeserializeSeed, Deserializer, IntoDeserializer, MapAccess, Unexpected, + Visitor, +}; +use serde::forward_to_deserialize_any; +use serde::ser::{Serialize, SerializeStruct, Serializer}; + +/// Reference to a range of bytes encompassing a single valid JSON value in the +/// input data. +/// +/// A `RawValue` can be used to defer parsing parts of a payload until later, +/// or to avoid parsing it at all in the case that part of the payload just +/// needs to be transferred verbatim into a different output object. +/// +/// When serializing, a value of this type will retain its original formatting +/// and will not be minified or pretty-printed. +/// +/// # Note +/// +/// `RawValue` is only available if serde\_json is built with the `"raw_value"` +/// feature. +/// +/// ```toml +/// [dependencies] +/// serde_json = { version = "1.0", features = ["raw_value"] } +/// ``` +/// +/// # Example +/// +/// ``` +/// use serde::{Deserialize, Serialize}; +/// use serde_json::{Result, value::RawValue}; +/// +/// #[derive(Deserialize)] +/// struct Input<'a> { +/// code: u32, +/// #[serde(borrow)] +/// payload: &'a RawValue, +/// } +/// +/// #[derive(Serialize)] +/// struct Output<'a> { +/// info: (u32, &'a RawValue), +/// } +/// +/// // Efficiently rearrange JSON input containing separate "code" and "payload" +/// // keys into a single "info" key holding an array of code and payload. +/// // +/// // This could be done equivalently using serde_json::Value as the type for +/// // payload, but &RawValue will perform better because it does not require +/// // memory allocation. The correct range of bytes is borrowed from the input +/// // data and pasted verbatim into the output. +/// fn rearrange(input: &str) -> Result<String> { +/// let input: Input = serde_json::from_str(input)?; +/// +/// let output = Output { +/// info: (input.code, input.payload), +/// }; +/// +/// serde_json::to_string(&output) +/// } +/// +/// fn main() -> Result<()> { +/// let out = rearrange(r#" {"code": 200, "payload": {}} "#)?; +/// +/// assert_eq!(out, r#"{"info":[200,{}]}"#); +/// +/// Ok(()) +/// } +/// ``` +/// +/// # Ownership +/// +/// The typical usage of `RawValue` will be in the borrowed form: +/// +/// ``` +/// # use serde::Deserialize; +/// # use serde_json::value::RawValue; +/// # +/// #[derive(Deserialize)] +/// struct SomeStruct<'a> { +/// #[serde(borrow)] +/// raw_value: &'a RawValue, +/// } +/// ``` +/// +/// The borrowed form is suitable when deserializing through +/// [`serde_json::from_str`] and [`serde_json::from_slice`] which support +/// borrowing from the input data without memory allocation. +/// +/// When deserializing through [`serde_json::from_reader`] you will need to use +/// the boxed form of `RawValue` instead. This is almost as efficient but +/// involves buffering the raw value from the I/O stream into memory. +/// +/// [`serde_json::from_str`]: ../fn.from_str.html +/// [`serde_json::from_slice`]: ../fn.from_slice.html +/// [`serde_json::from_reader`]: ../fn.from_reader.html +/// +/// ``` +/// # use serde::Deserialize; +/// # use serde_json::value::RawValue; +/// # +/// #[derive(Deserialize)] +/// struct SomeStruct { +/// raw_value: Box<RawValue>, +/// } +/// ``` +#[repr(C)] +#[cfg_attr(docsrs, doc(cfg(feature = "raw_value")))] +pub struct RawValue { + json: str, +} + +impl RawValue { + fn from_borrowed(json: &str) -> &Self { + unsafe { mem::transmute::<&str, &RawValue>(json) } + } + + fn from_owned(json: Box<str>) -> Box<Self> { + unsafe { mem::transmute::<Box<str>, Box<RawValue>>(json) } + } + + fn into_owned(raw_value: Box<Self>) -> Box<str> { + unsafe { mem::transmute::<Box<RawValue>, Box<str>>(raw_value) } + } +} + +impl Clone for Box<RawValue> { + fn clone(&self) -> Self { + (**self).to_owned() + } +} + +impl ToOwned for RawValue { + type Owned = Box<RawValue>; + + fn to_owned(&self) -> Self::Owned { + RawValue::from_owned(self.json.to_owned().into_boxed_str()) + } +} + +impl Default for Box<RawValue> { + fn default() -> Self { + RawValue::from_borrowed("null").to_owned() + } +} + +impl Debug for RawValue { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter + .debug_tuple("RawValue") + .field(&format_args!("{}", &self.json)) + .finish() + } +} + +impl Display for RawValue { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.write_str(&self.json) + } +} + +impl RawValue { + /// Convert an owned `String` of JSON data to an owned `RawValue`. + /// + /// This function is equivalent to `serde_json::from_str::<Box<RawValue>>` + /// except that we avoid an allocation and memcpy if both of the following + /// are true: + /// + /// - the input has no leading or trailing whitespace, and + /// - the input has capacity equal to its length. + pub fn from_string(json: String) -> Result<Box<Self>, Error> { + { + let borrowed = crate::from_str::<&Self>(&json)?; + if borrowed.json.len() < json.len() { + return Ok(borrowed.to_owned()); + } + } + Ok(Self::from_owned(json.into_boxed_str())) + } + + /// Access the JSON text underlying a raw value. + /// + /// # Example + /// + /// ``` + /// use serde::Deserialize; + /// use serde_json::{Result, value::RawValue}; + /// + /// #[derive(Deserialize)] + /// struct Response<'a> { + /// code: u32, + /// #[serde(borrow)] + /// payload: &'a RawValue, + /// } + /// + /// fn process(input: &str) -> Result<()> { + /// let response: Response = serde_json::from_str(input)?; + /// + /// let payload = response.payload.get(); + /// if payload.starts_with('{') { + /// // handle a payload which is a JSON map + /// } else { + /// // handle any other type + /// } + /// + /// Ok(()) + /// } + /// + /// fn main() -> Result<()> { + /// process(r#" {"code": 200, "payload": {}} "#)?; + /// Ok(()) + /// } + /// ``` + pub fn get(&self) -> &str { + &self.json + } +} + +impl From<Box<RawValue>> for Box<str> { + fn from(raw_value: Box<RawValue>) -> Self { + RawValue::into_owned(raw_value) + } +} + +/// Convert a `T` into a boxed `RawValue`. +/// +/// # Example +/// +/// ``` +/// // Upstream crate +/// # #[derive(Serialize)] +/// pub struct Thing { +/// foo: String, +/// bar: Option<String>, +/// extra_data: Box<RawValue>, +/// } +/// +/// // Local crate +/// use serde::Serialize; +/// use serde_json::value::{to_raw_value, RawValue}; +/// +/// #[derive(Serialize)] +/// struct MyExtraData { +/// a: u32, +/// b: u32, +/// } +/// +/// let my_thing = Thing { +/// foo: "FooVal".into(), +/// bar: None, +/// extra_data: to_raw_value(&MyExtraData { a: 1, b: 2 }).unwrap(), +/// }; +/// # assert_eq!( +/// # serde_json::to_value(my_thing).unwrap(), +/// # serde_json::json!({ +/// # "foo": "FooVal", +/// # "bar": null, +/// # "extra_data": { "a": 1, "b": 2 } +/// # }) +/// # ); +/// ``` +/// +/// # Errors +/// +/// This conversion can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +/// +/// ``` +/// use std::collections::BTreeMap; +/// +/// // The keys in this map are vectors, not strings. +/// let mut map = BTreeMap::new(); +/// map.insert(vec![32, 64], "x86"); +/// +/// println!("{}", serde_json::value::to_raw_value(&map).unwrap_err()); +/// ``` +#[cfg_attr(docsrs, doc(cfg(feature = "raw_value")))] +pub fn to_raw_value<T>(value: &T) -> Result<Box<RawValue>, Error> +where + T: ?Sized + Serialize, +{ + let json_string = crate::to_string(value)?; + Ok(RawValue::from_owned(json_string.into_boxed_str())) +} + +pub const TOKEN: &str = "$serde_json::private::RawValue"; + +impl Serialize for RawValue { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + let mut s = serializer.serialize_struct(TOKEN, 1)?; + s.serialize_field(TOKEN, &self.json)?; + s.end() + } +} + +impl<'de: 'a, 'a> Deserialize<'de> for &'a RawValue { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct ReferenceVisitor; + + impl<'de> Visitor<'de> for ReferenceVisitor { + type Value = &'de RawValue; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!(formatter, "any valid JSON value") + } + + fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> + where + V: MapAccess<'de>, + { + let value = visitor.next_key::<RawKey>()?; + if value.is_none() { + return Err(de::Error::invalid_type(Unexpected::Map, &self)); + } + visitor.next_value_seed(ReferenceFromString) + } + } + + deserializer.deserialize_newtype_struct(TOKEN, ReferenceVisitor) + } +} + +impl<'de> Deserialize<'de> for Box<RawValue> { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct BoxedVisitor; + + impl<'de> Visitor<'de> for BoxedVisitor { + type Value = Box<RawValue>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!(formatter, "any valid JSON value") + } + + fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> + where + V: MapAccess<'de>, + { + let value = visitor.next_key::<RawKey>()?; + if value.is_none() { + return Err(de::Error::invalid_type(Unexpected::Map, &self)); + } + visitor.next_value_seed(BoxedFromString) + } + } + + deserializer.deserialize_newtype_struct(TOKEN, BoxedVisitor) + } +} + +struct RawKey; + +impl<'de> Deserialize<'de> for RawKey { + fn deserialize<D>(deserializer: D) -> Result<RawKey, D::Error> + where + D: Deserializer<'de>, + { + struct FieldVisitor; + + impl<'de> Visitor<'de> for FieldVisitor { + type Value = (); + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("raw value") + } + + fn visit_str<E>(self, s: &str) -> Result<(), E> + where + E: de::Error, + { + if s == TOKEN { + Ok(()) + } else { + Err(de::Error::custom("unexpected raw value")) + } + } + } + + deserializer.deserialize_identifier(FieldVisitor)?; + Ok(RawKey) + } +} + +pub struct ReferenceFromString; + +impl<'de> DeserializeSeed<'de> for ReferenceFromString { + type Value = &'de RawValue; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_str(self) + } +} + +impl<'de> Visitor<'de> for ReferenceFromString { + type Value = &'de RawValue; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("raw value") + } + + fn visit_borrowed_str<E>(self, s: &'de str) -> Result<Self::Value, E> + where + E: de::Error, + { + Ok(RawValue::from_borrowed(s)) + } +} + +pub struct BoxedFromString; + +impl<'de> DeserializeSeed<'de> for BoxedFromString { + type Value = Box<RawValue>; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: Deserializer<'de>, + { + deserializer.deserialize_str(self) + } +} + +impl<'de> Visitor<'de> for BoxedFromString { + type Value = Box<RawValue>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("raw value") + } + + fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> + where + E: de::Error, + { + Ok(RawValue::from_owned(s.to_owned().into_boxed_str())) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + fn visit_string<E>(self, s: String) -> Result<Self::Value, E> + where + E: de::Error, + { + Ok(RawValue::from_owned(s.into_boxed_str())) + } +} + +struct RawKeyDeserializer; + +impl<'de> Deserializer<'de> for RawKeyDeserializer { + type Error = Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + visitor.visit_borrowed_str(TOKEN) + } + + forward_to_deserialize_any! { + bool u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 f32 f64 char str string seq + bytes byte_buf map struct option unit newtype_struct ignored_any + unit_struct tuple_struct tuple enum identifier + } +} + +pub struct OwnedRawDeserializer { + pub raw_value: Option<String>, +} + +impl<'de> MapAccess<'de> for OwnedRawDeserializer { + type Error = Error; + + fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error> + where + K: de::DeserializeSeed<'de>, + { + if self.raw_value.is_none() { + return Ok(None); + } + seed.deserialize(RawKeyDeserializer).map(Some) + } + + fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error> + where + V: de::DeserializeSeed<'de>, + { + seed.deserialize(self.raw_value.take().unwrap().into_deserializer()) + } +} + +pub struct BorrowedRawDeserializer<'de> { + pub raw_value: Option<&'de str>, +} + +impl<'de> MapAccess<'de> for BorrowedRawDeserializer<'de> { + type Error = Error; + + fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error> + where + K: de::DeserializeSeed<'de>, + { + if self.raw_value.is_none() { + return Ok(None); + } + seed.deserialize(RawKeyDeserializer).map(Some) + } + + fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error> + where + V: de::DeserializeSeed<'de>, + { + seed.deserialize(BorrowedStrDeserializer::new(self.raw_value.take().unwrap())) + } +} diff --git a/vendor/serde_json/src/read.rs b/vendor/serde_json/src/read.rs new file mode 100644 index 000000000..fc3a3ca74 --- /dev/null +++ b/vendor/serde_json/src/read.rs @@ -0,0 +1,1004 @@ +use crate::error::{Error, ErrorCode, Result}; +use alloc::vec::Vec; +use core::char; +use core::cmp; +use core::ops::Deref; +use core::str; + +#[cfg(feature = "std")] +use crate::io; +#[cfg(feature = "std")] +use crate::iter::LineColIterator; + +#[cfg(feature = "raw_value")] +use crate::raw::BorrowedRawDeserializer; +#[cfg(all(feature = "raw_value", feature = "std"))] +use crate::raw::OwnedRawDeserializer; +#[cfg(feature = "raw_value")] +use serde::de::Visitor; + +/// Trait used by the deserializer for iterating over input. This is manually +/// "specialized" for iterating over &[u8]. Once feature(specialization) is +/// stable we can use actual specialization. +/// +/// This trait is sealed and cannot be implemented for types outside of +/// `serde_json`. +pub trait Read<'de>: private::Sealed { + #[doc(hidden)] + fn next(&mut self) -> Result<Option<u8>>; + #[doc(hidden)] + fn peek(&mut self) -> Result<Option<u8>>; + + /// Only valid after a call to peek(). Discards the peeked byte. + #[doc(hidden)] + fn discard(&mut self); + + /// Position of the most recent call to next(). + /// + /// The most recent call was probably next() and not peek(), but this method + /// should try to return a sensible result if the most recent call was + /// actually peek() because we don't always know. + /// + /// Only called in case of an error, so performance is not important. + #[doc(hidden)] + fn position(&self) -> Position; + + /// Position of the most recent call to peek(). + /// + /// The most recent call was probably peek() and not next(), but this method + /// should try to return a sensible result if the most recent call was + /// actually next() because we don't always know. + /// + /// Only called in case of an error, so performance is not important. + #[doc(hidden)] + fn peek_position(&self) -> Position; + + /// Offset from the beginning of the input to the next byte that would be + /// returned by next() or peek(). + #[doc(hidden)] + fn byte_offset(&self) -> usize; + + /// Assumes the previous byte was a quotation mark. Parses a JSON-escaped + /// string until the next quotation mark using the given scratch space if + /// necessary. The scratch space is initially empty. + #[doc(hidden)] + fn parse_str<'s>(&'s mut self, scratch: &'s mut Vec<u8>) -> Result<Reference<'de, 's, str>>; + + /// Assumes the previous byte was a quotation mark. Parses a JSON-escaped + /// string until the next quotation mark using the given scratch space if + /// necessary. The scratch space is initially empty. + /// + /// This function returns the raw bytes in the string with escape sequences + /// expanded but without performing unicode validation. + #[doc(hidden)] + fn parse_str_raw<'s>( + &'s mut self, + scratch: &'s mut Vec<u8>, + ) -> Result<Reference<'de, 's, [u8]>>; + + /// Assumes the previous byte was a quotation mark. Parses a JSON-escaped + /// string until the next quotation mark but discards the data. + #[doc(hidden)] + fn ignore_str(&mut self) -> Result<()>; + + /// Assumes the previous byte was a hex escape sequnce ('\u') in a string. + /// Parses next hexadecimal sequence. + #[doc(hidden)] + fn decode_hex_escape(&mut self) -> Result<u16>; + + /// Switch raw buffering mode on. + /// + /// This is used when deserializing `RawValue`. + #[cfg(feature = "raw_value")] + #[doc(hidden)] + fn begin_raw_buffering(&mut self); + + /// Switch raw buffering mode off and provides the raw buffered data to the + /// given visitor. + #[cfg(feature = "raw_value")] + #[doc(hidden)] + fn end_raw_buffering<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: Visitor<'de>; + + /// Whether StreamDeserializer::next needs to check the failed flag. True + /// for IoRead, false for StrRead and SliceRead which can track failure by + /// truncating their input slice to avoid the extra check on every next + /// call. + #[doc(hidden)] + const should_early_return_if_failed: bool; + + /// Mark a persistent failure of StreamDeserializer, either by setting the + /// flag or by truncating the input data. + #[doc(hidden)] + fn set_failed(&mut self, failed: &mut bool); +} + +pub struct Position { + pub line: usize, + pub column: usize, +} + +pub enum Reference<'b, 'c, T> +where + T: ?Sized + 'static, +{ + Borrowed(&'b T), + Copied(&'c T), +} + +impl<'b, 'c, T> Deref for Reference<'b, 'c, T> +where + T: ?Sized + 'static, +{ + type Target = T; + + fn deref(&self) -> &Self::Target { + match *self { + Reference::Borrowed(b) => b, + Reference::Copied(c) => c, + } + } +} + +/// JSON input source that reads from a std::io input stream. +#[cfg(feature = "std")] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub struct IoRead<R> +where + R: io::Read, +{ + iter: LineColIterator<io::Bytes<R>>, + /// Temporary storage of peeked byte. + ch: Option<u8>, + #[cfg(feature = "raw_value")] + raw_buffer: Option<Vec<u8>>, +} + +/// JSON input source that reads from a slice of bytes. +// +// This is more efficient than other iterators because peek() can be read-only +// and we can compute line/col position only if an error happens. +pub struct SliceRead<'a> { + slice: &'a [u8], + /// Index of the *next* byte that will be returned by next() or peek(). + index: usize, + #[cfg(feature = "raw_value")] + raw_buffering_start_index: usize, +} + +/// JSON input source that reads from a UTF-8 string. +// +// Able to elide UTF-8 checks by assuming that the input is valid UTF-8. +pub struct StrRead<'a> { + delegate: SliceRead<'a>, + #[cfg(feature = "raw_value")] + data: &'a str, +} + +// Prevent users from implementing the Read trait. +mod private { + pub trait Sealed {} +} + +////////////////////////////////////////////////////////////////////////////// + +#[cfg(feature = "std")] +impl<R> IoRead<R> +where + R: io::Read, +{ + /// Create a JSON input source to read from a std::io input stream. + pub fn new(reader: R) -> Self { + IoRead { + iter: LineColIterator::new(reader.bytes()), + ch: None, + #[cfg(feature = "raw_value")] + raw_buffer: None, + } + } +} + +#[cfg(feature = "std")] +impl<R> private::Sealed for IoRead<R> where R: io::Read {} + +#[cfg(feature = "std")] +impl<R> IoRead<R> +where + R: io::Read, +{ + fn parse_str_bytes<'s, T, F>( + &'s mut self, + scratch: &'s mut Vec<u8>, + validate: bool, + result: F, + ) -> Result<T> + where + T: 's, + F: FnOnce(&'s Self, &'s [u8]) -> Result<T>, + { + loop { + let ch = tri!(next_or_eof(self)); + if !ESCAPE[ch as usize] { + scratch.push(ch); + continue; + } + match ch { + b'"' => { + return result(self, scratch); + } + b'\\' => { + tri!(parse_escape(self, validate, scratch)); + } + _ => { + if validate { + return error(self, ErrorCode::ControlCharacterWhileParsingString); + } + scratch.push(ch); + } + } + } + } +} + +#[cfg(feature = "std")] +impl<'de, R> Read<'de> for IoRead<R> +where + R: io::Read, +{ + #[inline] + fn next(&mut self) -> Result<Option<u8>> { + match self.ch.take() { + Some(ch) => { + #[cfg(feature = "raw_value")] + { + if let Some(buf) = &mut self.raw_buffer { + buf.push(ch); + } + } + Ok(Some(ch)) + } + None => match self.iter.next() { + Some(Err(err)) => Err(Error::io(err)), + Some(Ok(ch)) => { + #[cfg(feature = "raw_value")] + { + if let Some(buf) = &mut self.raw_buffer { + buf.push(ch); + } + } + Ok(Some(ch)) + } + None => Ok(None), + }, + } + } + + #[inline] + fn peek(&mut self) -> Result<Option<u8>> { + match self.ch { + Some(ch) => Ok(Some(ch)), + None => match self.iter.next() { + Some(Err(err)) => Err(Error::io(err)), + Some(Ok(ch)) => { + self.ch = Some(ch); + Ok(self.ch) + } + None => Ok(None), + }, + } + } + + #[cfg(not(feature = "raw_value"))] + #[inline] + fn discard(&mut self) { + self.ch = None; + } + + #[cfg(feature = "raw_value")] + fn discard(&mut self) { + if let Some(ch) = self.ch.take() { + if let Some(buf) = &mut self.raw_buffer { + buf.push(ch); + } + } + } + + fn position(&self) -> Position { + Position { + line: self.iter.line(), + column: self.iter.col(), + } + } + + fn peek_position(&self) -> Position { + // The LineColIterator updates its position during peek() so it has the + // right one here. + self.position() + } + + fn byte_offset(&self) -> usize { + match self.ch { + Some(_) => self.iter.byte_offset() - 1, + None => self.iter.byte_offset(), + } + } + + fn parse_str<'s>(&'s mut self, scratch: &'s mut Vec<u8>) -> Result<Reference<'de, 's, str>> { + self.parse_str_bytes(scratch, true, as_str) + .map(Reference::Copied) + } + + fn parse_str_raw<'s>( + &'s mut self, + scratch: &'s mut Vec<u8>, + ) -> Result<Reference<'de, 's, [u8]>> { + self.parse_str_bytes(scratch, false, |_, bytes| Ok(bytes)) + .map(Reference::Copied) + } + + fn ignore_str(&mut self) -> Result<()> { + loop { + let ch = tri!(next_or_eof(self)); + if !ESCAPE[ch as usize] { + continue; + } + match ch { + b'"' => { + return Ok(()); + } + b'\\' => { + tri!(ignore_escape(self)); + } + _ => { + return error(self, ErrorCode::ControlCharacterWhileParsingString); + } + } + } + } + + fn decode_hex_escape(&mut self) -> Result<u16> { + let mut n = 0; + for _ in 0..4 { + match decode_hex_val(tri!(next_or_eof(self))) { + None => return error(self, ErrorCode::InvalidEscape), + Some(val) => { + n = (n << 4) + val; + } + } + } + Ok(n) + } + + #[cfg(feature = "raw_value")] + fn begin_raw_buffering(&mut self) { + self.raw_buffer = Some(Vec::new()); + } + + #[cfg(feature = "raw_value")] + fn end_raw_buffering<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: Visitor<'de>, + { + let raw = self.raw_buffer.take().unwrap(); + let raw = match String::from_utf8(raw) { + Ok(raw) => raw, + Err(_) => return error(self, ErrorCode::InvalidUnicodeCodePoint), + }; + visitor.visit_map(OwnedRawDeserializer { + raw_value: Some(raw), + }) + } + + const should_early_return_if_failed: bool = true; + + #[inline] + #[cold] + fn set_failed(&mut self, failed: &mut bool) { + *failed = true; + } +} + +////////////////////////////////////////////////////////////////////////////// + +impl<'a> SliceRead<'a> { + /// Create a JSON input source to read from a slice of bytes. + pub fn new(slice: &'a [u8]) -> Self { + SliceRead { + slice, + index: 0, + #[cfg(feature = "raw_value")] + raw_buffering_start_index: 0, + } + } + + fn position_of_index(&self, i: usize) -> Position { + let mut position = Position { line: 1, column: 0 }; + for ch in &self.slice[..i] { + match *ch { + b'\n' => { + position.line += 1; + position.column = 0; + } + _ => { + position.column += 1; + } + } + } + position + } + + /// The big optimization here over IoRead is that if the string contains no + /// backslash escape sequences, the returned &str is a slice of the raw JSON + /// data so we avoid copying into the scratch space. + fn parse_str_bytes<'s, T, F>( + &'s mut self, + scratch: &'s mut Vec<u8>, + validate: bool, + result: F, + ) -> Result<Reference<'a, 's, T>> + where + T: ?Sized + 's, + F: for<'f> FnOnce(&'s Self, &'f [u8]) -> Result<&'f T>, + { + // Index of the first byte not yet copied into the scratch space. + let mut start = self.index; + + loop { + while self.index < self.slice.len() && !ESCAPE[self.slice[self.index] as usize] { + self.index += 1; + } + if self.index == self.slice.len() { + return error(self, ErrorCode::EofWhileParsingString); + } + match self.slice[self.index] { + b'"' => { + if scratch.is_empty() { + // Fast path: return a slice of the raw JSON without any + // copying. + let borrowed = &self.slice[start..self.index]; + self.index += 1; + return result(self, borrowed).map(Reference::Borrowed); + } else { + scratch.extend_from_slice(&self.slice[start..self.index]); + self.index += 1; + return result(self, scratch).map(Reference::Copied); + } + } + b'\\' => { + scratch.extend_from_slice(&self.slice[start..self.index]); + self.index += 1; + tri!(parse_escape(self, validate, scratch)); + start = self.index; + } + _ => { + self.index += 1; + if validate { + return error(self, ErrorCode::ControlCharacterWhileParsingString); + } + } + } + } + } +} + +impl<'a> private::Sealed for SliceRead<'a> {} + +impl<'a> Read<'a> for SliceRead<'a> { + #[inline] + fn next(&mut self) -> Result<Option<u8>> { + // `Ok(self.slice.get(self.index).map(|ch| { self.index += 1; *ch }))` + // is about 10% slower. + Ok(if self.index < self.slice.len() { + let ch = self.slice[self.index]; + self.index += 1; + Some(ch) + } else { + None + }) + } + + #[inline] + fn peek(&mut self) -> Result<Option<u8>> { + // `Ok(self.slice.get(self.index).map(|ch| *ch))` is about 10% slower + // for some reason. + Ok(if self.index < self.slice.len() { + Some(self.slice[self.index]) + } else { + None + }) + } + + #[inline] + fn discard(&mut self) { + self.index += 1; + } + + fn position(&self) -> Position { + self.position_of_index(self.index) + } + + fn peek_position(&self) -> Position { + // Cap it at slice.len() just in case the most recent call was next() + // and it returned the last byte. + self.position_of_index(cmp::min(self.slice.len(), self.index + 1)) + } + + fn byte_offset(&self) -> usize { + self.index + } + + fn parse_str<'s>(&'s mut self, scratch: &'s mut Vec<u8>) -> Result<Reference<'a, 's, str>> { + self.parse_str_bytes(scratch, true, as_str) + } + + fn parse_str_raw<'s>( + &'s mut self, + scratch: &'s mut Vec<u8>, + ) -> Result<Reference<'a, 's, [u8]>> { + self.parse_str_bytes(scratch, false, |_, bytes| Ok(bytes)) + } + + fn ignore_str(&mut self) -> Result<()> { + loop { + while self.index < self.slice.len() && !ESCAPE[self.slice[self.index] as usize] { + self.index += 1; + } + if self.index == self.slice.len() { + return error(self, ErrorCode::EofWhileParsingString); + } + match self.slice[self.index] { + b'"' => { + self.index += 1; + return Ok(()); + } + b'\\' => { + self.index += 1; + tri!(ignore_escape(self)); + } + _ => { + return error(self, ErrorCode::ControlCharacterWhileParsingString); + } + } + } + } + + fn decode_hex_escape(&mut self) -> Result<u16> { + if self.index + 4 > self.slice.len() { + self.index = self.slice.len(); + return error(self, ErrorCode::EofWhileParsingString); + } + + let mut n = 0; + for _ in 0..4 { + let ch = decode_hex_val(self.slice[self.index]); + self.index += 1; + match ch { + None => return error(self, ErrorCode::InvalidEscape), + Some(val) => { + n = (n << 4) + val; + } + } + } + Ok(n) + } + + #[cfg(feature = "raw_value")] + fn begin_raw_buffering(&mut self) { + self.raw_buffering_start_index = self.index; + } + + #[cfg(feature = "raw_value")] + fn end_raw_buffering<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: Visitor<'a>, + { + let raw = &self.slice[self.raw_buffering_start_index..self.index]; + let raw = match str::from_utf8(raw) { + Ok(raw) => raw, + Err(_) => return error(self, ErrorCode::InvalidUnicodeCodePoint), + }; + visitor.visit_map(BorrowedRawDeserializer { + raw_value: Some(raw), + }) + } + + const should_early_return_if_failed: bool = false; + + #[inline] + #[cold] + fn set_failed(&mut self, _failed: &mut bool) { + self.slice = &self.slice[..self.index]; + } +} + +////////////////////////////////////////////////////////////////////////////// + +impl<'a> StrRead<'a> { + /// Create a JSON input source to read from a UTF-8 string. + pub fn new(s: &'a str) -> Self { + StrRead { + delegate: SliceRead::new(s.as_bytes()), + #[cfg(feature = "raw_value")] + data: s, + } + } +} + +impl<'a> private::Sealed for StrRead<'a> {} + +impl<'a> Read<'a> for StrRead<'a> { + #[inline] + fn next(&mut self) -> Result<Option<u8>> { + self.delegate.next() + } + + #[inline] + fn peek(&mut self) -> Result<Option<u8>> { + self.delegate.peek() + } + + #[inline] + fn discard(&mut self) { + self.delegate.discard(); + } + + fn position(&self) -> Position { + self.delegate.position() + } + + fn peek_position(&self) -> Position { + self.delegate.peek_position() + } + + fn byte_offset(&self) -> usize { + self.delegate.byte_offset() + } + + fn parse_str<'s>(&'s mut self, scratch: &'s mut Vec<u8>) -> Result<Reference<'a, 's, str>> { + self.delegate.parse_str_bytes(scratch, true, |_, bytes| { + // The deserialization input came in as &str with a UTF-8 guarantee, + // and the \u-escapes are checked along the way, so don't need to + // check here. + Ok(unsafe { str::from_utf8_unchecked(bytes) }) + }) + } + + fn parse_str_raw<'s>( + &'s mut self, + scratch: &'s mut Vec<u8>, + ) -> Result<Reference<'a, 's, [u8]>> { + self.delegate.parse_str_raw(scratch) + } + + fn ignore_str(&mut self) -> Result<()> { + self.delegate.ignore_str() + } + + fn decode_hex_escape(&mut self) -> Result<u16> { + self.delegate.decode_hex_escape() + } + + #[cfg(feature = "raw_value")] + fn begin_raw_buffering(&mut self) { + self.delegate.begin_raw_buffering(); + } + + #[cfg(feature = "raw_value")] + fn end_raw_buffering<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: Visitor<'a>, + { + let raw = &self.data[self.delegate.raw_buffering_start_index..self.delegate.index]; + visitor.visit_map(BorrowedRawDeserializer { + raw_value: Some(raw), + }) + } + + const should_early_return_if_failed: bool = false; + + #[inline] + #[cold] + fn set_failed(&mut self, failed: &mut bool) { + self.delegate.set_failed(failed); + } +} + +////////////////////////////////////////////////////////////////////////////// + +impl<'a, 'de, R> private::Sealed for &'a mut R where R: Read<'de> {} + +impl<'a, 'de, R> Read<'de> for &'a mut R +where + R: Read<'de>, +{ + fn next(&mut self) -> Result<Option<u8>> { + R::next(self) + } + + fn peek(&mut self) -> Result<Option<u8>> { + R::peek(self) + } + + fn discard(&mut self) { + R::discard(self); + } + + fn position(&self) -> Position { + R::position(self) + } + + fn peek_position(&self) -> Position { + R::peek_position(self) + } + + fn byte_offset(&self) -> usize { + R::byte_offset(self) + } + + fn parse_str<'s>(&'s mut self, scratch: &'s mut Vec<u8>) -> Result<Reference<'de, 's, str>> { + R::parse_str(self, scratch) + } + + fn parse_str_raw<'s>( + &'s mut self, + scratch: &'s mut Vec<u8>, + ) -> Result<Reference<'de, 's, [u8]>> { + R::parse_str_raw(self, scratch) + } + + fn ignore_str(&mut self) -> Result<()> { + R::ignore_str(self) + } + + fn decode_hex_escape(&mut self) -> Result<u16> { + R::decode_hex_escape(self) + } + + #[cfg(feature = "raw_value")] + fn begin_raw_buffering(&mut self) { + R::begin_raw_buffering(self); + } + + #[cfg(feature = "raw_value")] + fn end_raw_buffering<V>(&mut self, visitor: V) -> Result<V::Value> + where + V: Visitor<'de>, + { + R::end_raw_buffering(self, visitor) + } + + const should_early_return_if_failed: bool = R::should_early_return_if_failed; + + fn set_failed(&mut self, failed: &mut bool) { + R::set_failed(self, failed); + } +} + +////////////////////////////////////////////////////////////////////////////// + +/// Marker for whether StreamDeserializer can implement FusedIterator. +pub trait Fused: private::Sealed {} +impl<'a> Fused for SliceRead<'a> {} +impl<'a> Fused for StrRead<'a> {} + +// Lookup table of bytes that must be escaped. A value of true at index i means +// that byte i requires an escape sequence in the input. +static ESCAPE: [bool; 256] = { + const CT: bool = true; // control character \x00..=\x1F + const QU: bool = true; // quote \x22 + const BS: bool = true; // backslash \x5C + const __: bool = false; // allow unescaped + [ + // 1 2 3 4 5 6 7 8 9 A B C D E F + CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, // 0 + CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, CT, // 1 + __, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4 + __, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F + ] +}; + +fn next_or_eof<'de, R>(read: &mut R) -> Result<u8> +where + R: ?Sized + Read<'de>, +{ + match tri!(read.next()) { + Some(b) => Ok(b), + None => error(read, ErrorCode::EofWhileParsingString), + } +} + +fn peek_or_eof<'de, R>(read: &mut R) -> Result<u8> +where + R: ?Sized + Read<'de>, +{ + match tri!(read.peek()) { + Some(b) => Ok(b), + None => error(read, ErrorCode::EofWhileParsingString), + } +} + +fn error<'de, R, T>(read: &R, reason: ErrorCode) -> Result<T> +where + R: ?Sized + Read<'de>, +{ + let position = read.position(); + Err(Error::syntax(reason, position.line, position.column)) +} + +fn as_str<'de, 's, R: Read<'de>>(read: &R, slice: &'s [u8]) -> Result<&'s str> { + str::from_utf8(slice).or_else(|_| error(read, ErrorCode::InvalidUnicodeCodePoint)) +} + +/// Parses a JSON escape sequence and appends it into the scratch space. Assumes +/// the previous byte read was a backslash. +fn parse_escape<'de, R: Read<'de>>( + read: &mut R, + validate: bool, + scratch: &mut Vec<u8>, +) -> Result<()> { + let ch = tri!(next_or_eof(read)); + + match ch { + b'"' => scratch.push(b'"'), + b'\\' => scratch.push(b'\\'), + b'/' => scratch.push(b'/'), + b'b' => scratch.push(b'\x08'), + b'f' => scratch.push(b'\x0c'), + b'n' => scratch.push(b'\n'), + b'r' => scratch.push(b'\r'), + b't' => scratch.push(b'\t'), + b'u' => { + fn encode_surrogate(scratch: &mut Vec<u8>, n: u16) { + scratch.extend_from_slice(&[ + (n >> 12 & 0b0000_1111) as u8 | 0b1110_0000, + (n >> 6 & 0b0011_1111) as u8 | 0b1000_0000, + (n & 0b0011_1111) as u8 | 0b1000_0000, + ]); + } + + let c = match tri!(read.decode_hex_escape()) { + n @ 0xDC00..=0xDFFF => { + return if validate { + error(read, ErrorCode::LoneLeadingSurrogateInHexEscape) + } else { + encode_surrogate(scratch, n); + Ok(()) + }; + } + + // Non-BMP characters are encoded as a sequence of two hex + // escapes, representing UTF-16 surrogates. If deserializing a + // utf-8 string the surrogates are required to be paired, + // whereas deserializing a byte string accepts lone surrogates. + n1 @ 0xD800..=0xDBFF => { + if tri!(peek_or_eof(read)) == b'\\' { + read.discard(); + } else { + return if validate { + read.discard(); + error(read, ErrorCode::UnexpectedEndOfHexEscape) + } else { + encode_surrogate(scratch, n1); + Ok(()) + }; + } + + if tri!(peek_or_eof(read)) == b'u' { + read.discard(); + } else { + return if validate { + read.discard(); + error(read, ErrorCode::UnexpectedEndOfHexEscape) + } else { + encode_surrogate(scratch, n1); + // The \ prior to this byte started an escape sequence, + // so we need to parse that now. This recursive call + // does not blow the stack on malicious input because + // the escape is not \u, so it will be handled by one + // of the easy nonrecursive cases. + parse_escape(read, validate, scratch) + }; + } + + let n2 = tri!(read.decode_hex_escape()); + + if n2 < 0xDC00 || n2 > 0xDFFF { + return error(read, ErrorCode::LoneLeadingSurrogateInHexEscape); + } + + let n = (((n1 - 0xD800) as u32) << 10 | (n2 - 0xDC00) as u32) + 0x1_0000; + + match char::from_u32(n) { + Some(c) => c, + None => { + return error(read, ErrorCode::InvalidUnicodeCodePoint); + } + } + } + + // Every u16 outside of the surrogate ranges above is guaranteed + // to be a legal char. + n => char::from_u32(n as u32).unwrap(), + }; + + scratch.extend_from_slice(c.encode_utf8(&mut [0_u8; 4]).as_bytes()); + } + _ => { + return error(read, ErrorCode::InvalidEscape); + } + } + + Ok(()) +} + +/// Parses a JSON escape sequence and discards the value. Assumes the previous +/// byte read was a backslash. +fn ignore_escape<'de, R>(read: &mut R) -> Result<()> +where + R: ?Sized + Read<'de>, +{ + let ch = tri!(next_or_eof(read)); + + match ch { + b'"' | b'\\' | b'/' | b'b' | b'f' | b'n' | b'r' | b't' => {} + b'u' => { + // At this point we don't care if the codepoint is valid. We just + // want to consume it. We don't actually know what is valid or not + // at this point, because that depends on if this string will + // ultimately be parsed into a string or a byte buffer in the "real" + // parse. + + tri!(read.decode_hex_escape()); + } + _ => { + return error(read, ErrorCode::InvalidEscape); + } + } + + Ok(()) +} + +static HEX: [u8; 256] = { + const __: u8 = 255; // not a hex digit + [ + // 1 2 3 4 5 6 7 8 9 A B C D E F + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 1 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2 + 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, __, __, __, __, __, __, // 3 + __, 10, 11, 12, 13, 14, 15, __, __, __, __, __, __, __, __, __, // 4 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 5 + __, 10, 11, 12, 13, 14, 15, __, __, __, __, __, __, __, __, __, // 6 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F + ] +}; + +fn decode_hex_val(val: u8) -> Option<u16> { + let n = HEX[val as usize] as u16; + if n == 255 { + None + } else { + Some(n) + } +} diff --git a/vendor/serde_json/src/ser.rs b/vendor/serde_json/src/ser.rs new file mode 100644 index 000000000..64cb00e1a --- /dev/null +++ b/vendor/serde_json/src/ser.rs @@ -0,0 +1,2257 @@ +//! Serialize a Rust data structure into JSON data. + +use crate::error::{Error, ErrorCode, Result}; +use crate::io; +use alloc::string::{String, ToString}; +use alloc::vec::Vec; +use core::fmt::{self, Display}; +use core::num::FpCategory; +use serde::ser::{self, Impossible, Serialize}; +use serde::serde_if_integer128; + +/// A structure for serializing Rust values into JSON. +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub struct Serializer<W, F = CompactFormatter> { + writer: W, + formatter: F, +} + +impl<W> Serializer<W> +where + W: io::Write, +{ + /// Creates a new JSON serializer. + #[inline] + pub fn new(writer: W) -> Self { + Serializer::with_formatter(writer, CompactFormatter) + } +} + +impl<'a, W> Serializer<W, PrettyFormatter<'a>> +where + W: io::Write, +{ + /// Creates a new JSON pretty print serializer. + #[inline] + pub fn pretty(writer: W) -> Self { + Serializer::with_formatter(writer, PrettyFormatter::new()) + } +} + +impl<W, F> Serializer<W, F> +where + W: io::Write, + F: Formatter, +{ + /// Creates a new JSON visitor whose output will be written to the writer + /// specified. + #[inline] + pub fn with_formatter(writer: W, formatter: F) -> Self { + Serializer { writer, formatter } + } + + /// Unwrap the `Writer` from the `Serializer`. + #[inline] + pub fn into_inner(self) -> W { + self.writer + } +} + +impl<'a, W, F> ser::Serializer for &'a mut Serializer<W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + type SerializeSeq = Compound<'a, W, F>; + type SerializeTuple = Compound<'a, W, F>; + type SerializeTupleStruct = Compound<'a, W, F>; + type SerializeTupleVariant = Compound<'a, W, F>; + type SerializeMap = Compound<'a, W, F>; + type SerializeStruct = Compound<'a, W, F>; + type SerializeStructVariant = Compound<'a, W, F>; + + #[inline] + fn serialize_bool(self, value: bool) -> Result<()> { + tri!(self + .formatter + .write_bool(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_i8(self, value: i8) -> Result<()> { + tri!(self + .formatter + .write_i8(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_i16(self, value: i16) -> Result<()> { + tri!(self + .formatter + .write_i16(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_i32(self, value: i32) -> Result<()> { + tri!(self + .formatter + .write_i32(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_i64(self, value: i64) -> Result<()> { + tri!(self + .formatter + .write_i64(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + serde_if_integer128! { + fn serialize_i128(self, value: i128) -> Result<()> { + self.formatter + .write_number_str(&mut self.writer, &value.to_string()) + .map_err(Error::io) + } + } + + #[inline] + fn serialize_u8(self, value: u8) -> Result<()> { + tri!(self + .formatter + .write_u8(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_u16(self, value: u16) -> Result<()> { + tri!(self + .formatter + .write_u16(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_u32(self, value: u32) -> Result<()> { + tri!(self + .formatter + .write_u32(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_u64(self, value: u64) -> Result<()> { + tri!(self + .formatter + .write_u64(&mut self.writer, value) + .map_err(Error::io)); + Ok(()) + } + + serde_if_integer128! { + fn serialize_u128(self, value: u128) -> Result<()> { + self.formatter + .write_number_str(&mut self.writer, &value.to_string()) + .map_err(Error::io) + } + } + + #[inline] + fn serialize_f32(self, value: f32) -> Result<()> { + match value.classify() { + FpCategory::Nan | FpCategory::Infinite => { + tri!(self + .formatter + .write_null(&mut self.writer) + .map_err(Error::io)); + } + _ => { + tri!(self + .formatter + .write_f32(&mut self.writer, value) + .map_err(Error::io)); + } + } + Ok(()) + } + + #[inline] + fn serialize_f64(self, value: f64) -> Result<()> { + match value.classify() { + FpCategory::Nan | FpCategory::Infinite => { + tri!(self + .formatter + .write_null(&mut self.writer) + .map_err(Error::io)); + } + _ => { + tri!(self + .formatter + .write_f64(&mut self.writer, value) + .map_err(Error::io)); + } + } + Ok(()) + } + + #[inline] + fn serialize_char(self, value: char) -> Result<()> { + // A char encoded as UTF-8 takes 4 bytes at most. + let mut buf = [0; 4]; + self.serialize_str(value.encode_utf8(&mut buf)) + } + + #[inline] + fn serialize_str(self, value: &str) -> Result<()> { + tri!(format_escaped_str(&mut self.writer, &mut self.formatter, value).map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_bytes(self, value: &[u8]) -> Result<()> { + use serde::ser::SerializeSeq; + let mut seq = tri!(self.serialize_seq(Some(value.len()))); + for byte in value { + tri!(seq.serialize_element(byte)); + } + seq.end() + } + + #[inline] + fn serialize_unit(self) -> Result<()> { + tri!(self + .formatter + .write_null(&mut self.writer) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_unit_struct(self, _name: &'static str) -> Result<()> { + self.serialize_unit() + } + + #[inline] + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + ) -> Result<()> { + self.serialize_str(variant) + } + + /// Serialize newtypes without an object wrapper. + #[inline] + fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + value.serialize(self) + } + + #[inline] + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + value: &T, + ) -> Result<()> + where + T: ?Sized + Serialize, + { + tri!(self + .formatter + .begin_object(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .begin_object_key(&mut self.writer, true) + .map_err(Error::io)); + tri!(self.serialize_str(variant)); + tri!(self + .formatter + .end_object_key(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .begin_object_value(&mut self.writer) + .map_err(Error::io)); + tri!(value.serialize(&mut *self)); + tri!(self + .formatter + .end_object_value(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .end_object(&mut self.writer) + .map_err(Error::io)); + Ok(()) + } + + #[inline] + fn serialize_none(self) -> Result<()> { + self.serialize_unit() + } + + #[inline] + fn serialize_some<T>(self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + value.serialize(self) + } + + #[inline] + fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> { + tri!(self + .formatter + .begin_array(&mut self.writer) + .map_err(Error::io)); + if len == Some(0) { + tri!(self + .formatter + .end_array(&mut self.writer) + .map_err(Error::io)); + Ok(Compound::Map { + ser: self, + state: State::Empty, + }) + } else { + Ok(Compound::Map { + ser: self, + state: State::First, + }) + } + } + + #[inline] + fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> { + self.serialize_seq(Some(len)) + } + + #[inline] + fn serialize_tuple_struct( + self, + _name: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleStruct> { + self.serialize_seq(Some(len)) + } + + #[inline] + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleVariant> { + tri!(self + .formatter + .begin_object(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .begin_object_key(&mut self.writer, true) + .map_err(Error::io)); + tri!(self.serialize_str(variant)); + tri!(self + .formatter + .end_object_key(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .begin_object_value(&mut self.writer) + .map_err(Error::io)); + self.serialize_seq(Some(len)) + } + + #[inline] + fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap> { + tri!(self + .formatter + .begin_object(&mut self.writer) + .map_err(Error::io)); + if len == Some(0) { + tri!(self + .formatter + .end_object(&mut self.writer) + .map_err(Error::io)); + Ok(Compound::Map { + ser: self, + state: State::Empty, + }) + } else { + Ok(Compound::Map { + ser: self, + state: State::First, + }) + } + } + + #[inline] + fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct> { + match name { + #[cfg(feature = "arbitrary_precision")] + crate::number::TOKEN => Ok(Compound::Number { ser: self }), + #[cfg(feature = "raw_value")] + crate::raw::TOKEN => Ok(Compound::RawValue { ser: self }), + _ => self.serialize_map(Some(len)), + } + } + + #[inline] + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeStructVariant> { + tri!(self + .formatter + .begin_object(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .begin_object_key(&mut self.writer, true) + .map_err(Error::io)); + tri!(self.serialize_str(variant)); + tri!(self + .formatter + .end_object_key(&mut self.writer) + .map_err(Error::io)); + tri!(self + .formatter + .begin_object_value(&mut self.writer) + .map_err(Error::io)); + self.serialize_map(Some(len)) + } + + fn collect_str<T>(self, value: &T) -> Result<()> + where + T: ?Sized + Display, + { + use self::fmt::Write; + + struct Adapter<'ser, W: 'ser, F: 'ser> { + writer: &'ser mut W, + formatter: &'ser mut F, + error: Option<io::Error>, + } + + impl<'ser, W, F> Write for Adapter<'ser, W, F> + where + W: io::Write, + F: Formatter, + { + fn write_str(&mut self, s: &str) -> fmt::Result { + debug_assert!(self.error.is_none()); + match format_escaped_str_contents(self.writer, self.formatter, s) { + Ok(()) => Ok(()), + Err(err) => { + self.error = Some(err); + Err(fmt::Error) + } + } + } + } + + tri!(self + .formatter + .begin_string(&mut self.writer) + .map_err(Error::io)); + { + let mut adapter = Adapter { + writer: &mut self.writer, + formatter: &mut self.formatter, + error: None, + }; + match write!(adapter, "{}", value) { + Ok(()) => debug_assert!(adapter.error.is_none()), + Err(fmt::Error) => { + return Err(Error::io(adapter.error.expect("there should be an error"))); + } + } + } + tri!(self + .formatter + .end_string(&mut self.writer) + .map_err(Error::io)); + Ok(()) + } +} + +// Not public API. Should be pub(crate). +#[doc(hidden)] +#[derive(Eq, PartialEq)] +pub enum State { + Empty, + First, + Rest, +} + +// Not public API. Should be pub(crate). +#[doc(hidden)] +pub enum Compound<'a, W: 'a, F: 'a> { + Map { + ser: &'a mut Serializer<W, F>, + state: State, + }, + #[cfg(feature = "arbitrary_precision")] + Number { ser: &'a mut Serializer<W, F> }, + #[cfg(feature = "raw_value")] + RawValue { ser: &'a mut Serializer<W, F> }, +} + +impl<'a, W, F> ser::SerializeSeq for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_element<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + Compound::Map { ser, state } => { + tri!(ser + .formatter + .begin_array_value(&mut ser.writer, *state == State::First) + .map_err(Error::io)); + *state = State::Rest; + tri!(value.serialize(&mut **ser)); + tri!(ser + .formatter + .end_array_value(&mut ser.writer) + .map_err(Error::io)); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } + + #[inline] + fn end(self) -> Result<()> { + match self { + Compound::Map { ser, state } => { + match state { + State::Empty => {} + _ => tri!(ser.formatter.end_array(&mut ser.writer).map_err(Error::io)), + } + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } +} + +impl<'a, W, F> ser::SerializeTuple for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_element<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + ser::SerializeSeq::serialize_element(self, value) + } + + #[inline] + fn end(self) -> Result<()> { + ser::SerializeSeq::end(self) + } +} + +impl<'a, W, F> ser::SerializeTupleStruct for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_field<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + ser::SerializeSeq::serialize_element(self, value) + } + + #[inline] + fn end(self) -> Result<()> { + ser::SerializeSeq::end(self) + } +} + +impl<'a, W, F> ser::SerializeTupleVariant for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_field<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + ser::SerializeSeq::serialize_element(self, value) + } + + #[inline] + fn end(self) -> Result<()> { + match self { + Compound::Map { ser, state } => { + match state { + State::Empty => {} + _ => tri!(ser.formatter.end_array(&mut ser.writer).map_err(Error::io)), + } + tri!(ser + .formatter + .end_object_value(&mut ser.writer) + .map_err(Error::io)); + tri!(ser.formatter.end_object(&mut ser.writer).map_err(Error::io)); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } +} + +impl<'a, W, F> ser::SerializeMap for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_key<T>(&mut self, key: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + Compound::Map { ser, state } => { + tri!(ser + .formatter + .begin_object_key(&mut ser.writer, *state == State::First) + .map_err(Error::io)); + *state = State::Rest; + + tri!(key.serialize(MapKeySerializer { ser: *ser })); + + tri!(ser + .formatter + .end_object_key(&mut ser.writer) + .map_err(Error::io)); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } + + #[inline] + fn serialize_value<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + Compound::Map { ser, .. } => { + tri!(ser + .formatter + .begin_object_value(&mut ser.writer) + .map_err(Error::io)); + tri!(value.serialize(&mut **ser)); + tri!(ser + .formatter + .end_object_value(&mut ser.writer) + .map_err(Error::io)); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } + + #[inline] + fn end(self) -> Result<()> { + match self { + Compound::Map { ser, state } => { + match state { + State::Empty => {} + _ => tri!(ser.formatter.end_object(&mut ser.writer).map_err(Error::io)), + } + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } +} + +impl<'a, W, F> ser::SerializeStruct for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + Compound::Map { .. } => ser::SerializeMap::serialize_entry(self, key, value), + #[cfg(feature = "arbitrary_precision")] + Compound::Number { ser, .. } => { + if key == crate::number::TOKEN { + tri!(value.serialize(NumberStrEmitter(ser))); + Ok(()) + } else { + Err(invalid_number()) + } + } + #[cfg(feature = "raw_value")] + Compound::RawValue { ser, .. } => { + if key == crate::raw::TOKEN { + tri!(value.serialize(RawValueStrEmitter(ser))); + Ok(()) + } else { + Err(invalid_raw_value()) + } + } + } + } + + #[inline] + fn end(self) -> Result<()> { + match self { + Compound::Map { .. } => ser::SerializeMap::end(self), + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => Ok(()), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => Ok(()), + } + } +} + +impl<'a, W, F> ser::SerializeStructVariant for Compound<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match *self { + Compound::Map { .. } => ser::SerializeStruct::serialize_field(self, key, value), + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } + + #[inline] + fn end(self) -> Result<()> { + match self { + Compound::Map { ser, state } => { + match state { + State::Empty => {} + _ => tri!(ser.formatter.end_object(&mut ser.writer).map_err(Error::io)), + } + tri!(ser + .formatter + .end_object_value(&mut ser.writer) + .map_err(Error::io)); + tri!(ser.formatter.end_object(&mut ser.writer).map_err(Error::io)); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + Compound::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + Compound::RawValue { .. } => unreachable!(), + } + } +} + +struct MapKeySerializer<'a, W: 'a, F: 'a> { + ser: &'a mut Serializer<W, F>, +} + +#[cfg(feature = "arbitrary_precision")] +fn invalid_number() -> Error { + Error::syntax(ErrorCode::InvalidNumber, 0, 0) +} + +#[cfg(feature = "raw_value")] +fn invalid_raw_value() -> Error { + Error::syntax(ErrorCode::ExpectedSomeValue, 0, 0) +} + +fn key_must_be_a_string() -> Error { + Error::syntax(ErrorCode::KeyMustBeAString, 0, 0) +} + +impl<'a, W, F> ser::Serializer for MapKeySerializer<'a, W, F> +where + W: io::Write, + F: Formatter, +{ + type Ok = (); + type Error = Error; + + #[inline] + fn serialize_str(self, value: &str) -> Result<()> { + self.ser.serialize_str(value) + } + + #[inline] + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + ) -> Result<()> { + self.ser.serialize_str(variant) + } + + #[inline] + fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + value.serialize(self) + } + + type SerializeSeq = Impossible<(), Error>; + type SerializeTuple = Impossible<(), Error>; + type SerializeTupleStruct = Impossible<(), Error>; + type SerializeTupleVariant = Impossible<(), Error>; + type SerializeMap = Impossible<(), Error>; + type SerializeStruct = Impossible<(), Error>; + type SerializeStructVariant = Impossible<(), Error>; + + fn serialize_bool(self, _value: bool) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_i8(self, value: i8) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_i8(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + fn serialize_i16(self, value: i16) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_i16(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + fn serialize_i32(self, value: i32) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_i32(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + fn serialize_i64(self, value: i64) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_i64(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + serde_if_integer128! { + fn serialize_i128(self, value: i128) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_number_str(&mut self.ser.writer, &value.to_string()) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + } + + fn serialize_u8(self, value: u8) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_u8(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + fn serialize_u16(self, value: u16) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_u16(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + fn serialize_u32(self, value: u32) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_u32(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + fn serialize_u64(self, value: u64) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_u64(&mut self.ser.writer, value) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + + serde_if_integer128! { + fn serialize_u128(self, value: u128) -> Result<()> { + tri!(self + .ser + .formatter + .begin_string(&mut self.ser.writer) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .write_number_str(&mut self.ser.writer, &value.to_string()) + .map_err(Error::io)); + tri!(self + .ser + .formatter + .end_string(&mut self.ser.writer) + .map_err(Error::io)); + Ok(()) + } + } + + fn serialize_f32(self, _value: f32) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_f64(self, _value: f64) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_char(self, value: char) -> Result<()> { + self.ser.serialize_str(&value.to_string()) + } + + fn serialize_bytes(self, _value: &[u8]) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_unit(self) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_unit_struct(self, _name: &'static str) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(key_must_be_a_string()) + } + + fn serialize_none(self) -> Result<()> { + Err(key_must_be_a_string()) + } + + fn serialize_some<T>(self, _value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(key_must_be_a_string()) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { + Err(key_must_be_a_string()) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { + Err(key_must_be_a_string()) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct> { + Err(key_must_be_a_string()) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Err(key_must_be_a_string()) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Err(key_must_be_a_string()) + } + + fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { + Err(key_must_be_a_string()) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Err(key_must_be_a_string()) + } + + fn collect_str<T>(self, value: &T) -> Result<()> + where + T: ?Sized + Display, + { + self.ser.collect_str(value) + } +} + +#[cfg(feature = "arbitrary_precision")] +struct NumberStrEmitter<'a, W: 'a + io::Write, F: 'a + Formatter>(&'a mut Serializer<W, F>); + +#[cfg(feature = "arbitrary_precision")] +impl<'a, W: io::Write, F: Formatter> ser::Serializer for NumberStrEmitter<'a, W, F> { + type Ok = (); + type Error = Error; + + type SerializeSeq = Impossible<(), Error>; + type SerializeTuple = Impossible<(), Error>; + type SerializeTupleStruct = Impossible<(), Error>; + type SerializeTupleVariant = Impossible<(), Error>; + type SerializeMap = Impossible<(), Error>; + type SerializeStruct = Impossible<(), Error>; + type SerializeStructVariant = Impossible<(), Error>; + + fn serialize_bool(self, _v: bool) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_i8(self, _v: i8) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_i16(self, _v: i16) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_i32(self, _v: i32) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_i64(self, _v: i64) -> Result<()> { + Err(invalid_number()) + } + + serde_if_integer128! { + fn serialize_i128(self, _v: i128) -> Result<()> { + Err(invalid_number()) + } + } + + fn serialize_u8(self, _v: u8) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_u16(self, _v: u16) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_u32(self, _v: u32) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_u64(self, _v: u64) -> Result<()> { + Err(invalid_number()) + } + + serde_if_integer128! { + fn serialize_u128(self, _v: u128) -> Result<()> { + Err(invalid_number()) + } + } + + fn serialize_f32(self, _v: f32) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_f64(self, _v: f64) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_char(self, _v: char) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_str(self, value: &str) -> Result<()> { + let NumberStrEmitter(serializer) = self; + serializer + .formatter + .write_number_str(&mut serializer.writer, value) + .map_err(Error::io) + } + + fn serialize_bytes(self, _value: &[u8]) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_none(self) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_some<T>(self, _value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(invalid_number()) + } + + fn serialize_unit(self) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_unit_struct(self, _name: &'static str) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + ) -> Result<()> { + Err(invalid_number()) + } + + fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(invalid_number()) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(invalid_number()) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { + Err(invalid_number()) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { + Err(invalid_number()) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct> { + Err(invalid_number()) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Err(invalid_number()) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Err(invalid_number()) + } + + fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { + Err(invalid_number()) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Err(invalid_number()) + } +} + +#[cfg(feature = "raw_value")] +struct RawValueStrEmitter<'a, W: 'a + io::Write, F: 'a + Formatter>(&'a mut Serializer<W, F>); + +#[cfg(feature = "raw_value")] +impl<'a, W: io::Write, F: Formatter> ser::Serializer for RawValueStrEmitter<'a, W, F> { + type Ok = (); + type Error = Error; + + type SerializeSeq = Impossible<(), Error>; + type SerializeTuple = Impossible<(), Error>; + type SerializeTupleStruct = Impossible<(), Error>; + type SerializeTupleVariant = Impossible<(), Error>; + type SerializeMap = Impossible<(), Error>; + type SerializeStruct = Impossible<(), Error>; + type SerializeStructVariant = Impossible<(), Error>; + + fn serialize_bool(self, _v: bool) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_i8(self, _v: i8) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_i16(self, _v: i16) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_i32(self, _v: i32) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_i64(self, _v: i64) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + serde_if_integer128! { + fn serialize_i128(self, _v: i128) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + } + + fn serialize_u8(self, _v: u8) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_u16(self, _v: u16) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_u32(self, _v: u32) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_u64(self, _v: u64) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + serde_if_integer128! { + fn serialize_u128(self, _v: u128) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + } + + fn serialize_f32(self, _v: f32) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_f64(self, _v: f64) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_char(self, _v: char) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_str(self, value: &str) -> Result<()> { + let RawValueStrEmitter(serializer) = self; + serializer + .formatter + .write_raw_fragment(&mut serializer.writer, value) + .map_err(Error::io) + } + + fn serialize_bytes(self, _value: &[u8]) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_none(self) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_some<T>(self, _value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_unit(self) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_unit_struct(self, _name: &'static str) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + ) -> Result<()> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> Result<()> + where + T: ?Sized + Serialize, + { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { + Err(ser::Error::custom("expected RawValue")) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Err(ser::Error::custom("expected RawValue")) + } + + fn collect_str<T>(self, value: &T) -> Result<Self::Ok> + where + T: ?Sized + Display, + { + self.serialize_str(&value.to_string()) + } +} + +/// Represents a character escape code in a type-safe manner. +pub enum CharEscape { + /// An escaped quote `"` + Quote, + /// An escaped reverse solidus `\` + ReverseSolidus, + /// An escaped solidus `/` + Solidus, + /// An escaped backspace character (usually escaped as `\b`) + Backspace, + /// An escaped form feed character (usually escaped as `\f`) + FormFeed, + /// An escaped line feed character (usually escaped as `\n`) + LineFeed, + /// An escaped carriage return character (usually escaped as `\r`) + CarriageReturn, + /// An escaped tab character (usually escaped as `\t`) + Tab, + /// An escaped ASCII plane control character (usually escaped as + /// `\u00XX` where `XX` are two hex characters) + AsciiControl(u8), +} + +impl CharEscape { + #[inline] + fn from_escape_table(escape: u8, byte: u8) -> CharEscape { + match escape { + self::BB => CharEscape::Backspace, + self::TT => CharEscape::Tab, + self::NN => CharEscape::LineFeed, + self::FF => CharEscape::FormFeed, + self::RR => CharEscape::CarriageReturn, + self::QU => CharEscape::Quote, + self::BS => CharEscape::ReverseSolidus, + self::UU => CharEscape::AsciiControl(byte), + _ => unreachable!(), + } + } +} + +/// This trait abstracts away serializing the JSON control characters, which allows the user to +/// optionally pretty print the JSON output. +pub trait Formatter { + /// Writes a `null` value to the specified writer. + #[inline] + fn write_null<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"null") + } + + /// Writes a `true` or `false` value to the specified writer. + #[inline] + fn write_bool<W>(&mut self, writer: &mut W, value: bool) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let s = if value { + b"true" as &[u8] + } else { + b"false" as &[u8] + }; + writer.write_all(s) + } + + /// Writes an integer value like `-123` to the specified writer. + #[inline] + fn write_i8<W>(&mut self, writer: &mut W, value: i8) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `-123` to the specified writer. + #[inline] + fn write_i16<W>(&mut self, writer: &mut W, value: i16) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `-123` to the specified writer. + #[inline] + fn write_i32<W>(&mut self, writer: &mut W, value: i32) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `-123` to the specified writer. + #[inline] + fn write_i64<W>(&mut self, writer: &mut W, value: i64) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `123` to the specified writer. + #[inline] + fn write_u8<W>(&mut self, writer: &mut W, value: u8) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `123` to the specified writer. + #[inline] + fn write_u16<W>(&mut self, writer: &mut W, value: u16) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `123` to the specified writer. + #[inline] + fn write_u32<W>(&mut self, writer: &mut W, value: u32) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes an integer value like `123` to the specified writer. + #[inline] + fn write_u64<W>(&mut self, writer: &mut W, value: u64) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format(value); + writer.write_all(s.as_bytes()) + } + + /// Writes a floating point value like `-31.26e+12` to the specified writer. + #[inline] + fn write_f32<W>(&mut self, writer: &mut W, value: f32) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = ryu::Buffer::new(); + let s = buffer.format_finite(value); + writer.write_all(s.as_bytes()) + } + + /// Writes a floating point value like `-31.26e+12` to the specified writer. + #[inline] + fn write_f64<W>(&mut self, writer: &mut W, value: f64) -> io::Result<()> + where + W: ?Sized + io::Write, + { + let mut buffer = ryu::Buffer::new(); + let s = buffer.format_finite(value); + writer.write_all(s.as_bytes()) + } + + /// Writes a number that has already been rendered to a string. + #[inline] + fn write_number_str<W>(&mut self, writer: &mut W, value: &str) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(value.as_bytes()) + } + + /// Called before each series of `write_string_fragment` and + /// `write_char_escape`. Writes a `"` to the specified writer. + #[inline] + fn begin_string<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"\"") + } + + /// Called after each series of `write_string_fragment` and + /// `write_char_escape`. Writes a `"` to the specified writer. + #[inline] + fn end_string<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"\"") + } + + /// Writes a string fragment that doesn't need any escaping to the + /// specified writer. + #[inline] + fn write_string_fragment<W>(&mut self, writer: &mut W, fragment: &str) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(fragment.as_bytes()) + } + + /// Writes a character escape code to the specified writer. + #[inline] + fn write_char_escape<W>(&mut self, writer: &mut W, char_escape: CharEscape) -> io::Result<()> + where + W: ?Sized + io::Write, + { + use self::CharEscape::*; + + let s = match char_escape { + Quote => b"\\\"", + ReverseSolidus => b"\\\\", + Solidus => b"\\/", + Backspace => b"\\b", + FormFeed => b"\\f", + LineFeed => b"\\n", + CarriageReturn => b"\\r", + Tab => b"\\t", + AsciiControl(byte) => { + static HEX_DIGITS: [u8; 16] = *b"0123456789abcdef"; + let bytes = &[ + b'\\', + b'u', + b'0', + b'0', + HEX_DIGITS[(byte >> 4) as usize], + HEX_DIGITS[(byte & 0xF) as usize], + ]; + return writer.write_all(bytes); + } + }; + + writer.write_all(s) + } + + /// Called before every array. Writes a `[` to the specified + /// writer. + #[inline] + fn begin_array<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"[") + } + + /// Called after every array. Writes a `]` to the specified + /// writer. + #[inline] + fn end_array<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"]") + } + + /// Called before every array value. Writes a `,` if needed to + /// the specified writer. + #[inline] + fn begin_array_value<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()> + where + W: ?Sized + io::Write, + { + if first { + Ok(()) + } else { + writer.write_all(b",") + } + } + + /// Called after every array value. + #[inline] + fn end_array_value<W>(&mut self, _writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + Ok(()) + } + + /// Called before every object. Writes a `{` to the specified + /// writer. + #[inline] + fn begin_object<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"{") + } + + /// Called after every object. Writes a `}` to the specified + /// writer. + #[inline] + fn end_object<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b"}") + } + + /// Called before every object key. + #[inline] + fn begin_object_key<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()> + where + W: ?Sized + io::Write, + { + if first { + Ok(()) + } else { + writer.write_all(b",") + } + } + + /// Called after every object key. A `:` should be written to the + /// specified writer by either this method or + /// `begin_object_value`. + #[inline] + fn end_object_key<W>(&mut self, _writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + Ok(()) + } + + /// Called before every object value. A `:` should be written to + /// the specified writer by either this method or + /// `end_object_key`. + #[inline] + fn begin_object_value<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b":") + } + + /// Called after every object value. + #[inline] + fn end_object_value<W>(&mut self, _writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + Ok(()) + } + + /// Writes a raw JSON fragment that doesn't need any escaping to the + /// specified writer. + #[inline] + fn write_raw_fragment<W>(&mut self, writer: &mut W, fragment: &str) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(fragment.as_bytes()) + } +} + +/// This structure compacts a JSON value with no extra whitespace. +#[derive(Clone, Debug)] +pub struct CompactFormatter; + +impl Formatter for CompactFormatter {} + +/// This structure pretty prints a JSON value to make it human readable. +#[derive(Clone, Debug)] +pub struct PrettyFormatter<'a> { + current_indent: usize, + has_value: bool, + indent: &'a [u8], +} + +impl<'a> PrettyFormatter<'a> { + /// Construct a pretty printer formatter that defaults to using two spaces for indentation. + pub fn new() -> Self { + PrettyFormatter::with_indent(b" ") + } + + /// Construct a pretty printer formatter that uses the `indent` string for indentation. + pub fn with_indent(indent: &'a [u8]) -> Self { + PrettyFormatter { + current_indent: 0, + has_value: false, + indent, + } + } +} + +impl<'a> Default for PrettyFormatter<'a> { + fn default() -> Self { + PrettyFormatter::new() + } +} + +impl<'a> Formatter for PrettyFormatter<'a> { + #[inline] + fn begin_array<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + self.current_indent += 1; + self.has_value = false; + writer.write_all(b"[") + } + + #[inline] + fn end_array<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + self.current_indent -= 1; + + if self.has_value { + tri!(writer.write_all(b"\n")); + tri!(indent(writer, self.current_indent, self.indent)); + } + + writer.write_all(b"]") + } + + #[inline] + fn begin_array_value<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()> + where + W: ?Sized + io::Write, + { + if first { + tri!(writer.write_all(b"\n")); + } else { + tri!(writer.write_all(b",\n")); + } + tri!(indent(writer, self.current_indent, self.indent)); + Ok(()) + } + + #[inline] + fn end_array_value<W>(&mut self, _writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + self.has_value = true; + Ok(()) + } + + #[inline] + fn begin_object<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + self.current_indent += 1; + self.has_value = false; + writer.write_all(b"{") + } + + #[inline] + fn end_object<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + self.current_indent -= 1; + + if self.has_value { + tri!(writer.write_all(b"\n")); + tri!(indent(writer, self.current_indent, self.indent)); + } + + writer.write_all(b"}") + } + + #[inline] + fn begin_object_key<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()> + where + W: ?Sized + io::Write, + { + if first { + tri!(writer.write_all(b"\n")); + } else { + tri!(writer.write_all(b",\n")); + } + indent(writer, self.current_indent, self.indent) + } + + #[inline] + fn begin_object_value<W>(&mut self, writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + writer.write_all(b": ") + } + + #[inline] + fn end_object_value<W>(&mut self, _writer: &mut W) -> io::Result<()> + where + W: ?Sized + io::Write, + { + self.has_value = true; + Ok(()) + } +} + +fn format_escaped_str<W, F>(writer: &mut W, formatter: &mut F, value: &str) -> io::Result<()> +where + W: ?Sized + io::Write, + F: ?Sized + Formatter, +{ + tri!(formatter.begin_string(writer)); + tri!(format_escaped_str_contents(writer, formatter, value)); + tri!(formatter.end_string(writer)); + Ok(()) +} + +fn format_escaped_str_contents<W, F>( + writer: &mut W, + formatter: &mut F, + value: &str, +) -> io::Result<()> +where + W: ?Sized + io::Write, + F: ?Sized + Formatter, +{ + let bytes = value.as_bytes(); + + let mut start = 0; + + for (i, &byte) in bytes.iter().enumerate() { + let escape = ESCAPE[byte as usize]; + if escape == 0 { + continue; + } + + if start < i { + tri!(formatter.write_string_fragment(writer, &value[start..i])); + } + + let char_escape = CharEscape::from_escape_table(escape, byte); + tri!(formatter.write_char_escape(writer, char_escape)); + + start = i + 1; + } + + if start != bytes.len() { + tri!(formatter.write_string_fragment(writer, &value[start..])); + } + + Ok(()) +} + +const BB: u8 = b'b'; // \x08 +const TT: u8 = b't'; // \x09 +const NN: u8 = b'n'; // \x0A +const FF: u8 = b'f'; // \x0C +const RR: u8 = b'r'; // \x0D +const QU: u8 = b'"'; // \x22 +const BS: u8 = b'\\'; // \x5C +const UU: u8 = b'u'; // \x00...\x1F except the ones above +const __: u8 = 0; + +// Lookup table of escape sequences. A value of b'x' at index i means that byte +// i is escaped as "\x" in JSON. A value of 0 means that byte i is not escaped. +static ESCAPE: [u8; 256] = [ + // 1 2 3 4 5 6 7 8 9 A B C D E F + UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0 + UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1 + __, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4 + __, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9 + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E + __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F +]; + +/// Serialize the given data structure as JSON into the IO stream. +/// +/// # Errors +/// +/// Serialization can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +#[inline] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub fn to_writer<W, T>(writer: W, value: &T) -> Result<()> +where + W: io::Write, + T: ?Sized + Serialize, +{ + let mut ser = Serializer::new(writer); + tri!(value.serialize(&mut ser)); + Ok(()) +} + +/// Serialize the given data structure as pretty-printed JSON into the IO +/// stream. +/// +/// # Errors +/// +/// Serialization can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +#[inline] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +pub fn to_writer_pretty<W, T>(writer: W, value: &T) -> Result<()> +where + W: io::Write, + T: ?Sized + Serialize, +{ + let mut ser = Serializer::pretty(writer); + tri!(value.serialize(&mut ser)); + Ok(()) +} + +/// Serialize the given data structure as a JSON byte vector. +/// +/// # Errors +/// +/// Serialization can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +#[inline] +pub fn to_vec<T>(value: &T) -> Result<Vec<u8>> +where + T: ?Sized + Serialize, +{ + let mut writer = Vec::with_capacity(128); + tri!(to_writer(&mut writer, value)); + Ok(writer) +} + +/// Serialize the given data structure as a pretty-printed JSON byte vector. +/// +/// # Errors +/// +/// Serialization can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +#[inline] +pub fn to_vec_pretty<T>(value: &T) -> Result<Vec<u8>> +where + T: ?Sized + Serialize, +{ + let mut writer = Vec::with_capacity(128); + tri!(to_writer_pretty(&mut writer, value)); + Ok(writer) +} + +/// Serialize the given data structure as a String of JSON. +/// +/// # Errors +/// +/// Serialization can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +#[inline] +pub fn to_string<T>(value: &T) -> Result<String> +where + T: ?Sized + Serialize, +{ + let vec = tri!(to_vec(value)); + let string = unsafe { + // We do not emit invalid UTF-8. + String::from_utf8_unchecked(vec) + }; + Ok(string) +} + +/// Serialize the given data structure as a pretty-printed String of JSON. +/// +/// # Errors +/// +/// Serialization can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +#[inline] +pub fn to_string_pretty<T>(value: &T) -> Result<String> +where + T: ?Sized + Serialize, +{ + let vec = tri!(to_vec_pretty(value)); + let string = unsafe { + // We do not emit invalid UTF-8. + String::from_utf8_unchecked(vec) + }; + Ok(string) +} + +fn indent<W>(wr: &mut W, n: usize, s: &[u8]) -> io::Result<()> +where + W: ?Sized + io::Write, +{ + for _ in 0..n { + tri!(wr.write_all(s)); + } + + Ok(()) +} diff --git a/vendor/serde_json/src/value/de.rs b/vendor/serde_json/src/value/de.rs new file mode 100644 index 000000000..cc1d38565 --- /dev/null +++ b/vendor/serde_json/src/value/de.rs @@ -0,0 +1,1386 @@ +use crate::error::Error; +use crate::map::Map; +use crate::number::Number; +use crate::value::Value; +use alloc::borrow::{Cow, ToOwned}; +use alloc::string::String; +#[cfg(feature = "raw_value")] +use alloc::string::ToString; +use alloc::vec::{self, Vec}; +use core::fmt; +use core::slice; +use core::str::FromStr; +use serde::de::{ + self, Deserialize, DeserializeSeed, EnumAccess, Expected, IntoDeserializer, MapAccess, + SeqAccess, Unexpected, VariantAccess, Visitor, +}; +use serde::{forward_to_deserialize_any, serde_if_integer128}; + +#[cfg(feature = "arbitrary_precision")] +use crate::number::NumberFromString; + +impl<'de> Deserialize<'de> for Value { + #[inline] + fn deserialize<D>(deserializer: D) -> Result<Value, D::Error> + where + D: serde::Deserializer<'de>, + { + struct ValueVisitor; + + impl<'de> Visitor<'de> for ValueVisitor { + type Value = Value; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("any valid JSON value") + } + + #[inline] + fn visit_bool<E>(self, value: bool) -> Result<Value, E> { + Ok(Value::Bool(value)) + } + + #[inline] + fn visit_i64<E>(self, value: i64) -> Result<Value, E> { + Ok(Value::Number(value.into())) + } + + #[inline] + fn visit_u64<E>(self, value: u64) -> Result<Value, E> { + Ok(Value::Number(value.into())) + } + + #[inline] + fn visit_f64<E>(self, value: f64) -> Result<Value, E> { + Ok(Number::from_f64(value).map_or(Value::Null, Value::Number)) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + #[inline] + fn visit_str<E>(self, value: &str) -> Result<Value, E> + where + E: serde::de::Error, + { + self.visit_string(String::from(value)) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + #[inline] + fn visit_string<E>(self, value: String) -> Result<Value, E> { + Ok(Value::String(value)) + } + + #[inline] + fn visit_none<E>(self) -> Result<Value, E> { + Ok(Value::Null) + } + + #[inline] + fn visit_some<D>(self, deserializer: D) -> Result<Value, D::Error> + where + D: serde::Deserializer<'de>, + { + Deserialize::deserialize(deserializer) + } + + #[inline] + fn visit_unit<E>(self) -> Result<Value, E> { + Ok(Value::Null) + } + + #[inline] + fn visit_seq<V>(self, mut visitor: V) -> Result<Value, V::Error> + where + V: SeqAccess<'de>, + { + let mut vec = Vec::new(); + + while let Some(elem) = tri!(visitor.next_element()) { + vec.push(elem); + } + + Ok(Value::Array(vec)) + } + + #[cfg(any(feature = "std", feature = "alloc"))] + fn visit_map<V>(self, mut visitor: V) -> Result<Value, V::Error> + where + V: MapAccess<'de>, + { + match visitor.next_key_seed(KeyClassifier)? { + #[cfg(feature = "arbitrary_precision")] + Some(KeyClass::Number) => { + let number: NumberFromString = visitor.next_value()?; + Ok(Value::Number(number.value)) + } + #[cfg(feature = "raw_value")] + Some(KeyClass::RawValue) => { + let value = visitor.next_value_seed(crate::raw::BoxedFromString)?; + crate::from_str(value.get()).map_err(de::Error::custom) + } + Some(KeyClass::Map(first_key)) => { + let mut values = Map::new(); + + values.insert(first_key, tri!(visitor.next_value())); + while let Some((key, value)) = tri!(visitor.next_entry()) { + values.insert(key, value); + } + + Ok(Value::Object(values)) + } + None => Ok(Value::Object(Map::new())), + } + } + } + + deserializer.deserialize_any(ValueVisitor) + } +} + +impl FromStr for Value { + type Err = Error; + fn from_str(s: &str) -> Result<Value, Error> { + super::super::de::from_str(s) + } +} + +macro_rules! deserialize_number { + ($method:ident) => { + #[cfg(not(feature = "arbitrary_precision"))] + fn $method<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Number(n) => n.deserialize_any(visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn $method<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Number(n) => n.$method(visitor), + _ => self.deserialize_any(visitor), + } + } + }; +} + +fn visit_array<'de, V>(array: Vec<Value>, visitor: V) -> Result<V::Value, Error> +where + V: Visitor<'de>, +{ + let len = array.len(); + let mut deserializer = SeqDeserializer::new(array); + let seq = tri!(visitor.visit_seq(&mut deserializer)); + let remaining = deserializer.iter.len(); + if remaining == 0 { + Ok(seq) + } else { + Err(serde::de::Error::invalid_length( + len, + &"fewer elements in array", + )) + } +} + +fn visit_object<'de, V>(object: Map<String, Value>, visitor: V) -> Result<V::Value, Error> +where + V: Visitor<'de>, +{ + let len = object.len(); + let mut deserializer = MapDeserializer::new(object); + let map = tri!(visitor.visit_map(&mut deserializer)); + let remaining = deserializer.iter.len(); + if remaining == 0 { + Ok(map) + } else { + Err(serde::de::Error::invalid_length( + len, + &"fewer elements in map", + )) + } +} + +impl<'de> serde::Deserializer<'de> for Value { + type Error = Error; + + #[inline] + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Null => visitor.visit_unit(), + Value::Bool(v) => visitor.visit_bool(v), + Value::Number(n) => n.deserialize_any(visitor), + #[cfg(any(feature = "std", feature = "alloc"))] + Value::String(v) => visitor.visit_string(v), + Value::Array(v) => visit_array(v, visitor), + Value::Object(v) => visit_object(v, visitor), + } + } + + deserialize_number!(deserialize_i8); + deserialize_number!(deserialize_i16); + deserialize_number!(deserialize_i32); + deserialize_number!(deserialize_i64); + deserialize_number!(deserialize_u8); + deserialize_number!(deserialize_u16); + deserialize_number!(deserialize_u32); + deserialize_number!(deserialize_u64); + deserialize_number!(deserialize_f32); + deserialize_number!(deserialize_f64); + + serde_if_integer128! { + deserialize_number!(deserialize_i128); + deserialize_number!(deserialize_u128); + } + + #[inline] + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Null => visitor.visit_none(), + _ => visitor.visit_some(self), + } + } + + #[inline] + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + let (variant, value) = match self { + Value::Object(value) => { + let mut iter = value.into_iter(); + let (variant, value) = match iter.next() { + Some(v) => v, + None => { + return Err(serde::de::Error::invalid_value( + Unexpected::Map, + &"map with a single key", + )); + } + }; + // enums are encoded in json as maps with a single key:value pair + if iter.next().is_some() { + return Err(serde::de::Error::invalid_value( + Unexpected::Map, + &"map with a single key", + )); + } + (variant, Some(value)) + } + Value::String(variant) => (variant, None), + other => { + return Err(serde::de::Error::invalid_type( + other.unexpected(), + &"string or map", + )); + } + }; + + visitor.visit_enum(EnumDeserializer { variant, value }) + } + + #[inline] + fn deserialize_newtype_struct<V>( + self, + name: &'static str, + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + #[cfg(feature = "raw_value")] + { + if name == crate::raw::TOKEN { + return visitor.visit_map(crate::raw::OwnedRawDeserializer { + raw_value: Some(self.to_string()), + }); + } + } + + let _ = name; + visitor.visit_newtype_struct(self) + } + + fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Bool(v) => visitor.visit_bool(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_string(visitor) + } + + fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_string(visitor) + } + + fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + #[cfg(any(feature = "std", feature = "alloc"))] + Value::String(v) => visitor.visit_string(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_byte_buf(visitor) + } + + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + #[cfg(any(feature = "std", feature = "alloc"))] + Value::String(v) => visitor.visit_string(v), + Value::Array(v) => visit_array(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Null => visitor.visit_unit(), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_unit_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_unit(visitor) + } + + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Array(v) => visit_array(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_tuple_struct<V>( + self, + _name: &'static str, + _len: usize, + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Object(v) => visit_object(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_struct<V>( + self, + _name: &'static str, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Array(v) => visit_array(v, visitor), + Value::Object(v) => visit_object(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_string(visitor) + } + + fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + drop(self); + visitor.visit_unit() + } +} + +struct EnumDeserializer { + variant: String, + value: Option<Value>, +} + +impl<'de> EnumAccess<'de> for EnumDeserializer { + type Error = Error; + type Variant = VariantDeserializer; + + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, VariantDeserializer), Error> + where + V: DeserializeSeed<'de>, + { + let variant = self.variant.into_deserializer(); + let visitor = VariantDeserializer { value: self.value }; + seed.deserialize(variant).map(|v| (v, visitor)) + } +} + +impl<'de> IntoDeserializer<'de, Error> for Value { + type Deserializer = Self; + + fn into_deserializer(self) -> Self::Deserializer { + self + } +} + +struct VariantDeserializer { + value: Option<Value>, +} + +impl<'de> VariantAccess<'de> for VariantDeserializer { + type Error = Error; + + fn unit_variant(self) -> Result<(), Error> { + match self.value { + Some(value) => Deserialize::deserialize(value), + None => Ok(()), + } + } + + fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Error> + where + T: DeserializeSeed<'de>, + { + match self.value { + Some(value) => seed.deserialize(value), + None => Err(serde::de::Error::invalid_type( + Unexpected::UnitVariant, + &"newtype variant", + )), + } + } + + fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self.value { + Some(Value::Array(v)) => { + if v.is_empty() { + visitor.visit_unit() + } else { + visit_array(v, visitor) + } + } + Some(other) => Err(serde::de::Error::invalid_type( + other.unexpected(), + &"tuple variant", + )), + None => Err(serde::de::Error::invalid_type( + Unexpected::UnitVariant, + &"tuple variant", + )), + } + } + + fn struct_variant<V>( + self, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self.value { + Some(Value::Object(v)) => visit_object(v, visitor), + Some(other) => Err(serde::de::Error::invalid_type( + other.unexpected(), + &"struct variant", + )), + None => Err(serde::de::Error::invalid_type( + Unexpected::UnitVariant, + &"struct variant", + )), + } + } +} + +struct SeqDeserializer { + iter: vec::IntoIter<Value>, +} + +impl SeqDeserializer { + fn new(vec: Vec<Value>) -> Self { + SeqDeserializer { + iter: vec.into_iter(), + } + } +} + +impl<'de> SeqAccess<'de> for SeqDeserializer { + type Error = Error; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error> + where + T: DeserializeSeed<'de>, + { + match self.iter.next() { + Some(value) => seed.deserialize(value).map(Some), + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + match self.iter.size_hint() { + (lower, Some(upper)) if lower == upper => Some(upper), + _ => None, + } + } +} + +struct MapDeserializer { + iter: <Map<String, Value> as IntoIterator>::IntoIter, + value: Option<Value>, +} + +impl MapDeserializer { + fn new(map: Map<String, Value>) -> Self { + MapDeserializer { + iter: map.into_iter(), + value: None, + } + } +} + +impl<'de> MapAccess<'de> for MapDeserializer { + type Error = Error; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error> + where + T: DeserializeSeed<'de>, + { + match self.iter.next() { + Some((key, value)) => { + self.value = Some(value); + let key_de = MapKeyDeserializer { + key: Cow::Owned(key), + }; + seed.deserialize(key_de).map(Some) + } + None => Ok(None), + } + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Error> + where + T: DeserializeSeed<'de>, + { + match self.value.take() { + Some(value) => seed.deserialize(value), + None => Err(serde::de::Error::custom("value is missing")), + } + } + + fn size_hint(&self) -> Option<usize> { + match self.iter.size_hint() { + (lower, Some(upper)) if lower == upper => Some(upper), + _ => None, + } + } +} + +macro_rules! deserialize_value_ref_number { + ($method:ident) => { + #[cfg(not(feature = "arbitrary_precision"))] + fn $method<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Number(n) => n.deserialize_any(visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + #[cfg(feature = "arbitrary_precision")] + fn $method<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Number(n) => n.$method(visitor), + _ => self.deserialize_any(visitor), + } + } + }; +} + +fn visit_array_ref<'de, V>(array: &'de [Value], visitor: V) -> Result<V::Value, Error> +where + V: Visitor<'de>, +{ + let len = array.len(); + let mut deserializer = SeqRefDeserializer::new(array); + let seq = tri!(visitor.visit_seq(&mut deserializer)); + let remaining = deserializer.iter.len(); + if remaining == 0 { + Ok(seq) + } else { + Err(serde::de::Error::invalid_length( + len, + &"fewer elements in array", + )) + } +} + +fn visit_object_ref<'de, V>(object: &'de Map<String, Value>, visitor: V) -> Result<V::Value, Error> +where + V: Visitor<'de>, +{ + let len = object.len(); + let mut deserializer = MapRefDeserializer::new(object); + let map = tri!(visitor.visit_map(&mut deserializer)); + let remaining = deserializer.iter.len(); + if remaining == 0 { + Ok(map) + } else { + Err(serde::de::Error::invalid_length( + len, + &"fewer elements in map", + )) + } +} + +impl<'de> serde::Deserializer<'de> for &'de Value { + type Error = Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Null => visitor.visit_unit(), + Value::Bool(v) => visitor.visit_bool(*v), + Value::Number(n) => n.deserialize_any(visitor), + Value::String(v) => visitor.visit_borrowed_str(v), + Value::Array(v) => visit_array_ref(v, visitor), + Value::Object(v) => visit_object_ref(v, visitor), + } + } + + deserialize_value_ref_number!(deserialize_i8); + deserialize_value_ref_number!(deserialize_i16); + deserialize_value_ref_number!(deserialize_i32); + deserialize_value_ref_number!(deserialize_i64); + deserialize_value_ref_number!(deserialize_u8); + deserialize_value_ref_number!(deserialize_u16); + deserialize_value_ref_number!(deserialize_u32); + deserialize_value_ref_number!(deserialize_u64); + deserialize_value_ref_number!(deserialize_f32); + deserialize_value_ref_number!(deserialize_f64); + + serde_if_integer128! { + deserialize_number!(deserialize_i128); + deserialize_number!(deserialize_u128); + } + + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match *self { + Value::Null => visitor.visit_none(), + _ => visitor.visit_some(self), + } + } + + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + let (variant, value) = match self { + Value::Object(value) => { + let mut iter = value.into_iter(); + let (variant, value) = match iter.next() { + Some(v) => v, + None => { + return Err(serde::de::Error::invalid_value( + Unexpected::Map, + &"map with a single key", + )); + } + }; + // enums are encoded in json as maps with a single key:value pair + if iter.next().is_some() { + return Err(serde::de::Error::invalid_value( + Unexpected::Map, + &"map with a single key", + )); + } + (variant, Some(value)) + } + Value::String(variant) => (variant, None), + other => { + return Err(serde::de::Error::invalid_type( + other.unexpected(), + &"string or map", + )); + } + }; + + visitor.visit_enum(EnumRefDeserializer { variant, value }) + } + + #[inline] + fn deserialize_newtype_struct<V>( + self, + name: &'static str, + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + #[cfg(feature = "raw_value")] + { + if name == crate::raw::TOKEN { + return visitor.visit_map(crate::raw::OwnedRawDeserializer { + raw_value: Some(self.to_string()), + }); + } + } + + let _ = name; + visitor.visit_newtype_struct(self) + } + + fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match *self { + Value::Bool(v) => visitor.visit_bool(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_str(visitor) + } + + fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::String(v) => visitor.visit_borrowed_str(v), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_str(visitor) + } + + fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::String(v) => visitor.visit_borrowed_str(v), + Value::Array(v) => visit_array_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_bytes(visitor) + } + + fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match *self { + Value::Null => visitor.visit_unit(), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_unit_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_unit(visitor) + } + + fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Array(v) => visit_array_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_tuple_struct<V>( + self, + _name: &'static str, + _len: usize, + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_seq(visitor) + } + + fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Object(v) => visit_object_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_struct<V>( + self, + _name: &'static str, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self { + Value::Array(v) => visit_array_ref(v, visitor), + Value::Object(v) => visit_object_ref(v, visitor), + _ => Err(self.invalid_type(&visitor)), + } + } + + fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.deserialize_str(visitor) + } + + fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + visitor.visit_unit() + } +} + +struct EnumRefDeserializer<'de> { + variant: &'de str, + value: Option<&'de Value>, +} + +impl<'de> EnumAccess<'de> for EnumRefDeserializer<'de> { + type Error = Error; + type Variant = VariantRefDeserializer<'de>; + + fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Error> + where + V: DeserializeSeed<'de>, + { + let variant = self.variant.into_deserializer(); + let visitor = VariantRefDeserializer { value: self.value }; + seed.deserialize(variant).map(|v| (v, visitor)) + } +} + +struct VariantRefDeserializer<'de> { + value: Option<&'de Value>, +} + +impl<'de> VariantAccess<'de> for VariantRefDeserializer<'de> { + type Error = Error; + + fn unit_variant(self) -> Result<(), Error> { + match self.value { + Some(value) => Deserialize::deserialize(value), + None => Ok(()), + } + } + + fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Error> + where + T: DeserializeSeed<'de>, + { + match self.value { + Some(value) => seed.deserialize(value), + None => Err(serde::de::Error::invalid_type( + Unexpected::UnitVariant, + &"newtype variant", + )), + } + } + + fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self.value { + Some(&Value::Array(ref v)) => { + if v.is_empty() { + visitor.visit_unit() + } else { + visit_array_ref(v, visitor) + } + } + Some(other) => Err(serde::de::Error::invalid_type( + other.unexpected(), + &"tuple variant", + )), + None => Err(serde::de::Error::invalid_type( + Unexpected::UnitVariant, + &"tuple variant", + )), + } + } + + fn struct_variant<V>( + self, + _fields: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match self.value { + Some(&Value::Object(ref v)) => visit_object_ref(v, visitor), + Some(other) => Err(serde::de::Error::invalid_type( + other.unexpected(), + &"struct variant", + )), + None => Err(serde::de::Error::invalid_type( + Unexpected::UnitVariant, + &"struct variant", + )), + } + } +} + +struct SeqRefDeserializer<'de> { + iter: slice::Iter<'de, Value>, +} + +impl<'de> SeqRefDeserializer<'de> { + fn new(slice: &'de [Value]) -> Self { + SeqRefDeserializer { iter: slice.iter() } + } +} + +impl<'de> SeqAccess<'de> for SeqRefDeserializer<'de> { + type Error = Error; + + fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error> + where + T: DeserializeSeed<'de>, + { + match self.iter.next() { + Some(value) => seed.deserialize(value).map(Some), + None => Ok(None), + } + } + + fn size_hint(&self) -> Option<usize> { + match self.iter.size_hint() { + (lower, Some(upper)) if lower == upper => Some(upper), + _ => None, + } + } +} + +struct MapRefDeserializer<'de> { + iter: <&'de Map<String, Value> as IntoIterator>::IntoIter, + value: Option<&'de Value>, +} + +impl<'de> MapRefDeserializer<'de> { + fn new(map: &'de Map<String, Value>) -> Self { + MapRefDeserializer { + iter: map.into_iter(), + value: None, + } + } +} + +impl<'de> MapAccess<'de> for MapRefDeserializer<'de> { + type Error = Error; + + fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error> + where + T: DeserializeSeed<'de>, + { + match self.iter.next() { + Some((key, value)) => { + self.value = Some(value); + let key_de = MapKeyDeserializer { + key: Cow::Borrowed(&**key), + }; + seed.deserialize(key_de).map(Some) + } + None => Ok(None), + } + } + + fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Error> + where + T: DeserializeSeed<'de>, + { + match self.value.take() { + Some(value) => seed.deserialize(value), + None => Err(serde::de::Error::custom("value is missing")), + } + } + + fn size_hint(&self) -> Option<usize> { + match self.iter.size_hint() { + (lower, Some(upper)) if lower == upper => Some(upper), + _ => None, + } + } +} + +struct MapKeyDeserializer<'de> { + key: Cow<'de, str>, +} + +macro_rules! deserialize_integer_key { + ($method:ident => $visit:ident) => { + fn $method<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + match (self.key.parse(), self.key) { + (Ok(integer), _) => visitor.$visit(integer), + (Err(_), Cow::Borrowed(s)) => visitor.visit_borrowed_str(s), + #[cfg(any(feature = "std", feature = "alloc"))] + (Err(_), Cow::Owned(s)) => visitor.visit_string(s), + } + } + }; +} + +impl<'de> serde::Deserializer<'de> for MapKeyDeserializer<'de> { + type Error = Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + BorrowedCowStrDeserializer::new(self.key).deserialize_any(visitor) + } + + deserialize_integer_key!(deserialize_i8 => visit_i8); + deserialize_integer_key!(deserialize_i16 => visit_i16); + deserialize_integer_key!(deserialize_i32 => visit_i32); + deserialize_integer_key!(deserialize_i64 => visit_i64); + deserialize_integer_key!(deserialize_u8 => visit_u8); + deserialize_integer_key!(deserialize_u16 => visit_u16); + deserialize_integer_key!(deserialize_u32 => visit_u32); + deserialize_integer_key!(deserialize_u64 => visit_u64); + + serde_if_integer128! { + deserialize_integer_key!(deserialize_i128 => visit_i128); + deserialize_integer_key!(deserialize_u128 => visit_u128); + } + + #[inline] + fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + // Map keys cannot be null. + visitor.visit_some(self) + } + + #[inline] + fn deserialize_newtype_struct<V>( + self, + _name: &'static str, + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + visitor.visit_newtype_struct(self) + } + + fn deserialize_enum<V>( + self, + name: &'static str, + variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: Visitor<'de>, + { + self.key + .into_deserializer() + .deserialize_enum(name, variants, visitor) + } + + forward_to_deserialize_any! { + bool f32 f64 char str string bytes byte_buf unit unit_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +struct KeyClassifier; + +enum KeyClass { + Map(String), + #[cfg(feature = "arbitrary_precision")] + Number, + #[cfg(feature = "raw_value")] + RawValue, +} + +impl<'de> DeserializeSeed<'de> for KeyClassifier { + type Value = KeyClass; + + fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> + where + D: serde::Deserializer<'de>, + { + deserializer.deserialize_str(self) + } +} + +impl<'de> Visitor<'de> for KeyClassifier { + type Value = KeyClass; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("a string key") + } + + fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> + where + E: de::Error, + { + match s { + #[cfg(feature = "arbitrary_precision")] + crate::number::TOKEN => Ok(KeyClass::Number), + #[cfg(feature = "raw_value")] + crate::raw::TOKEN => Ok(KeyClass::RawValue), + _ => Ok(KeyClass::Map(s.to_owned())), + } + } + + #[cfg(any(feature = "std", feature = "alloc"))] + fn visit_string<E>(self, s: String) -> Result<Self::Value, E> + where + E: de::Error, + { + match s.as_str() { + #[cfg(feature = "arbitrary_precision")] + crate::number::TOKEN => Ok(KeyClass::Number), + #[cfg(feature = "raw_value")] + crate::raw::TOKEN => Ok(KeyClass::RawValue), + _ => Ok(KeyClass::Map(s)), + } + } +} + +impl Value { + #[cold] + fn invalid_type<E>(&self, exp: &dyn Expected) -> E + where + E: serde::de::Error, + { + serde::de::Error::invalid_type(self.unexpected(), exp) + } + + #[cold] + fn unexpected(&self) -> Unexpected { + match self { + Value::Null => Unexpected::Unit, + Value::Bool(b) => Unexpected::Bool(*b), + Value::Number(n) => n.unexpected(), + Value::String(s) => Unexpected::Str(s), + Value::Array(_) => Unexpected::Seq, + Value::Object(_) => Unexpected::Map, + } + } +} + +struct BorrowedCowStrDeserializer<'de> { + value: Cow<'de, str>, +} + +impl<'de> BorrowedCowStrDeserializer<'de> { + fn new(value: Cow<'de, str>) -> Self { + BorrowedCowStrDeserializer { value } + } +} + +impl<'de> de::Deserializer<'de> for BorrowedCowStrDeserializer<'de> { + type Error = Error; + + fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + match self.value { + Cow::Borrowed(string) => visitor.visit_borrowed_str(string), + #[cfg(any(feature = "std", feature = "alloc"))] + Cow::Owned(string) => visitor.visit_string(string), + } + } + + fn deserialize_enum<V>( + self, + _name: &str, + _variants: &'static [&'static str], + visitor: V, + ) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + visitor.visit_enum(self) + } + + forward_to_deserialize_any! { + bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string + bytes byte_buf option unit unit_struct newtype_struct seq tuple + tuple_struct map struct identifier ignored_any + } +} + +impl<'de> de::EnumAccess<'de> for BorrowedCowStrDeserializer<'de> { + type Error = Error; + type Variant = UnitOnly; + + fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Error> + where + T: de::DeserializeSeed<'de>, + { + let value = seed.deserialize(self)?; + Ok((value, UnitOnly)) + } +} + +struct UnitOnly; + +impl<'de> de::VariantAccess<'de> for UnitOnly { + type Error = Error; + + fn unit_variant(self) -> Result<(), Error> { + Ok(()) + } + + fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Error> + where + T: de::DeserializeSeed<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"newtype variant", + )) + } + + fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"tuple variant", + )) + } + + fn struct_variant<V>( + self, + _fields: &'static [&'static str], + _visitor: V, + ) -> Result<V::Value, Error> + where + V: de::Visitor<'de>, + { + Err(de::Error::invalid_type( + Unexpected::UnitVariant, + &"struct variant", + )) + } +} diff --git a/vendor/serde_json/src/value/from.rs b/vendor/serde_json/src/value/from.rs new file mode 100644 index 000000000..858a6e48a --- /dev/null +++ b/vendor/serde_json/src/value/from.rs @@ -0,0 +1,282 @@ +use super::Value; +use crate::map::Map; +use crate::number::Number; +use alloc::borrow::Cow; +use alloc::string::{String, ToString}; +use alloc::vec::Vec; +use core::iter::FromIterator; + +#[cfg(feature = "arbitrary_precision")] +use serde::serde_if_integer128; + +macro_rules! from_integer { + ($($ty:ident)*) => { + $( + impl From<$ty> for Value { + fn from(n: $ty) -> Self { + Value::Number(n.into()) + } + } + )* + }; +} + +from_integer! { + i8 i16 i32 i64 isize + u8 u16 u32 u64 usize +} + +#[cfg(feature = "arbitrary_precision")] +serde_if_integer128! { + from_integer! { + i128 u128 + } +} + +impl From<f32> for Value { + /// Convert 32-bit floating point number to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let f: f32 = 13.37; + /// let x: Value = f.into(); + /// ``` + fn from(f: f32) -> Self { + From::from(f as f64) + } +} + +impl From<f64> for Value { + /// Convert 64-bit floating point number to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let f: f64 = 13.37; + /// let x: Value = f.into(); + /// ``` + fn from(f: f64) -> Self { + Number::from_f64(f).map_or(Value::Null, Value::Number) + } +} + +impl From<bool> for Value { + /// Convert boolean to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let b = false; + /// let x: Value = b.into(); + /// ``` + fn from(f: bool) -> Self { + Value::Bool(f) + } +} + +impl From<String> for Value { + /// Convert `String` to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let s: String = "lorem".to_string(); + /// let x: Value = s.into(); + /// ``` + fn from(f: String) -> Self { + Value::String(f) + } +} + +impl<'a> From<&'a str> for Value { + /// Convert string slice to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let s: &str = "lorem"; + /// let x: Value = s.into(); + /// ``` + fn from(f: &str) -> Self { + Value::String(f.to_string()) + } +} + +impl<'a> From<Cow<'a, str>> for Value { + /// Convert copy-on-write string to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// use std::borrow::Cow; + /// + /// let s: Cow<str> = Cow::Borrowed("lorem"); + /// let x: Value = s.into(); + /// ``` + /// + /// ``` + /// use serde_json::Value; + /// use std::borrow::Cow; + /// + /// let s: Cow<str> = Cow::Owned("lorem".to_string()); + /// let x: Value = s.into(); + /// ``` + fn from(f: Cow<'a, str>) -> Self { + Value::String(f.into_owned()) + } +} + +impl From<Number> for Value { + /// Convert `Number` to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::{Number, Value}; + /// + /// let n = Number::from(7); + /// let x: Value = n.into(); + /// ``` + fn from(f: Number) -> Self { + Value::Number(f) + } +} + +impl From<Map<String, Value>> for Value { + /// Convert map (with string keys) to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::{Map, Value}; + /// + /// let mut m = Map::new(); + /// m.insert("Lorem".to_string(), "ipsum".into()); + /// let x: Value = m.into(); + /// ``` + fn from(f: Map<String, Value>) -> Self { + Value::Object(f) + } +} + +impl<T: Into<Value>> From<Vec<T>> for Value { + /// Convert a `Vec` to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let v = vec!["lorem", "ipsum", "dolor"]; + /// let x: Value = v.into(); + /// ``` + fn from(f: Vec<T>) -> Self { + Value::Array(f.into_iter().map(Into::into).collect()) + } +} + +impl<'a, T: Clone + Into<Value>> From<&'a [T]> for Value { + /// Convert a slice to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let v: &[&str] = &["lorem", "ipsum", "dolor"]; + /// let x: Value = v.into(); + /// ``` + fn from(f: &'a [T]) -> Self { + Value::Array(f.iter().cloned().map(Into::into).collect()) + } +} + +impl<T: Into<Value>> FromIterator<T> for Value { + /// Convert an iteratable type to a `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let v = std::iter::repeat(42).take(5); + /// let x: Value = v.collect(); + /// ``` + /// + /// ``` + /// use serde_json::Value; + /// + /// let v: Vec<_> = vec!["lorem", "ipsum", "dolor"]; + /// let x: Value = v.into_iter().collect(); + /// ``` + /// + /// ``` + /// use std::iter::FromIterator; + /// use serde_json::Value; + /// + /// let x: Value = Value::from_iter(vec!["lorem", "ipsum", "dolor"]); + /// ``` + fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self { + Value::Array(iter.into_iter().map(Into::into).collect()) + } +} + +impl<K: Into<String>, V: Into<Value>> FromIterator<(K, V)> for Value { + /// Convert an iteratable type to a `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let v: Vec<_> = vec![("lorem", 40), ("ipsum", 2)]; + /// let x: Value = v.into_iter().collect(); + /// ``` + fn from_iter<I: IntoIterator<Item = (K, V)>>(iter: I) -> Self { + Value::Object( + iter.into_iter() + .map(|(k, v)| (k.into(), v.into())) + .collect(), + ) + } +} + +impl From<()> for Value { + /// Convert `()` to `Value` + /// + /// # Examples + /// + /// ``` + /// use serde_json::Value; + /// + /// let u = (); + /// let x: Value = u.into(); + /// ``` + fn from((): ()) -> Self { + Value::Null + } +} + +impl<T> From<Option<T>> for Value +where + T: Into<Value>, +{ + fn from(opt: Option<T>) -> Self { + match opt { + None => Value::Null, + Some(value) => Into::into(value), + } + } +} diff --git a/vendor/serde_json/src/value/index.rs b/vendor/serde_json/src/value/index.rs new file mode 100644 index 000000000..c74042b75 --- /dev/null +++ b/vendor/serde_json/src/value/index.rs @@ -0,0 +1,258 @@ +use super::Value; +use crate::map::Map; +use alloc::borrow::ToOwned; +use alloc::string::String; +use core::fmt::{self, Display}; +use core::ops; + +/// A type that can be used to index into a `serde_json::Value`. +/// +/// The [`get`] and [`get_mut`] methods of `Value` accept any type that +/// implements `Index`, as does the [square-bracket indexing operator]. This +/// trait is implemented for strings which are used as the index into a JSON +/// map, and for `usize` which is used as the index into a JSON array. +/// +/// [`get`]: ../enum.Value.html#method.get +/// [`get_mut`]: ../enum.Value.html#method.get_mut +/// [square-bracket indexing operator]: ../enum.Value.html#impl-Index%3CI%3E +/// +/// This trait is sealed and cannot be implemented for types outside of +/// `serde_json`. +/// +/// # Examples +/// +/// ``` +/// # use serde_json::json; +/// # +/// let data = json!({ "inner": [1, 2, 3] }); +/// +/// // Data is a JSON map so it can be indexed with a string. +/// let inner = &data["inner"]; +/// +/// // Inner is a JSON array so it can be indexed with an integer. +/// let first = &inner[0]; +/// +/// assert_eq!(first, 1); +/// ``` +pub trait Index: private::Sealed { + /// Return None if the key is not already in the array or object. + #[doc(hidden)] + fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value>; + + /// Return None if the key is not already in the array or object. + #[doc(hidden)] + fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value>; + + /// Panic if array index out of bounds. If key is not already in the object, + /// insert it with a value of null. Panic if Value is a type that cannot be + /// indexed into, except if Value is null then it can be treated as an empty + /// object. + #[doc(hidden)] + fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value; +} + +impl Index for usize { + fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> { + match v { + Value::Array(vec) => vec.get(*self), + _ => None, + } + } + fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> { + match v { + Value::Array(vec) => vec.get_mut(*self), + _ => None, + } + } + fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value { + match v { + Value::Array(vec) => { + let len = vec.len(); + vec.get_mut(*self).unwrap_or_else(|| { + panic!( + "cannot access index {} of JSON array of length {}", + self, len + ) + }) + } + _ => panic!("cannot access index {} of JSON {}", self, Type(v)), + } + } +} + +impl Index for str { + fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> { + match v { + Value::Object(map) => map.get(self), + _ => None, + } + } + fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> { + match v { + Value::Object(map) => map.get_mut(self), + _ => None, + } + } + fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value { + if let Value::Null = v { + *v = Value::Object(Map::new()); + } + match v { + Value::Object(map) => map.entry(self.to_owned()).or_insert(Value::Null), + _ => panic!("cannot access key {:?} in JSON {}", self, Type(v)), + } + } +} + +impl Index for String { + fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> { + self[..].index_into(v) + } + fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> { + self[..].index_into_mut(v) + } + fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value { + self[..].index_or_insert(v) + } +} + +impl<'a, T> Index for &'a T +where + T: ?Sized + Index, +{ + fn index_into<'v>(&self, v: &'v Value) -> Option<&'v Value> { + (**self).index_into(v) + } + fn index_into_mut<'v>(&self, v: &'v mut Value) -> Option<&'v mut Value> { + (**self).index_into_mut(v) + } + fn index_or_insert<'v>(&self, v: &'v mut Value) -> &'v mut Value { + (**self).index_or_insert(v) + } +} + +// Prevent users from implementing the Index trait. +mod private { + pub trait Sealed {} + impl Sealed for usize {} + impl Sealed for str {} + impl Sealed for alloc::string::String {} + impl<'a, T> Sealed for &'a T where T: ?Sized + Sealed {} +} + +/// Used in panic messages. +struct Type<'a>(&'a Value); + +impl<'a> Display for Type<'a> { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + match *self.0 { + Value::Null => formatter.write_str("null"), + Value::Bool(_) => formatter.write_str("boolean"), + Value::Number(_) => formatter.write_str("number"), + Value::String(_) => formatter.write_str("string"), + Value::Array(_) => formatter.write_str("array"), + Value::Object(_) => formatter.write_str("object"), + } + } +} + +// The usual semantics of Index is to panic on invalid indexing. +// +// That said, the usual semantics are for things like Vec and BTreeMap which +// have different use cases than Value. If you are working with a Vec, you know +// that you are working with a Vec and you can get the len of the Vec and make +// sure your indices are within bounds. The Value use cases are more +// loosey-goosey. You got some JSON from an endpoint and you want to pull values +// out of it. Outside of this Index impl, you already have the option of using +// value.as_array() and working with the Vec directly, or matching on +// Value::Array and getting the Vec directly. The Index impl means you can skip +// that and index directly into the thing using a concise syntax. You don't have +// to check the type, you don't have to check the len, it is all about what you +// expect the Value to look like. +// +// Basically the use cases that would be well served by panicking here are +// better served by using one of the other approaches: get and get_mut, +// as_array, or match. The value of this impl is that it adds a way of working +// with Value that is not well served by the existing approaches: concise and +// careless and sometimes that is exactly what you want. +impl<I> ops::Index<I> for Value +where + I: Index, +{ + type Output = Value; + + /// Index into a `serde_json::Value` using the syntax `value[0]` or + /// `value["k"]`. + /// + /// Returns `Value::Null` if the type of `self` does not match the type of + /// the index, for example if the index is a string and `self` is an array + /// or a number. Also returns `Value::Null` if the given key does not exist + /// in the map or the given index is not within the bounds of the array. + /// + /// For retrieving deeply nested values, you should have a look at the + /// `Value::pointer` method. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// let data = json!({ + /// "x": { + /// "y": ["z", "zz"] + /// } + /// }); + /// + /// assert_eq!(data["x"]["y"], json!(["z", "zz"])); + /// assert_eq!(data["x"]["y"][0], json!("z")); + /// + /// assert_eq!(data["a"], json!(null)); // returns null for undefined values + /// assert_eq!(data["a"]["b"], json!(null)); // does not panic + /// ``` + fn index(&self, index: I) -> &Value { + static NULL: Value = Value::Null; + index.index_into(self).unwrap_or(&NULL) + } +} + +impl<I> ops::IndexMut<I> for Value +where + I: Index, +{ + /// Write into a `serde_json::Value` using the syntax `value[0] = ...` or + /// `value["k"] = ...`. + /// + /// If the index is a number, the value must be an array of length bigger + /// than the index. Indexing into a value that is not an array or an array + /// that is too small will panic. + /// + /// If the index is a string, the value must be an object or null which is + /// treated like an empty object. If the key is not already present in the + /// object, it will be inserted with a value of null. Indexing into a value + /// that is neither an object nor null will panic. + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut data = json!({ "x": 0 }); + /// + /// // replace an existing key + /// data["x"] = json!(1); + /// + /// // insert a new key + /// data["y"] = json!([false, false, false]); + /// + /// // replace an array value + /// data["y"][0] = json!(true); + /// + /// // inserted a deeply nested key + /// data["a"]["b"]["c"]["d"] = json!(true); + /// + /// println!("{}", data); + /// ``` + fn index_mut(&mut self, index: I) -> &mut Value { + index.index_or_insert(self) + } +} diff --git a/vendor/serde_json/src/value/mod.rs b/vendor/serde_json/src/value/mod.rs new file mode 100644 index 000000000..4793e93ec --- /dev/null +++ b/vendor/serde_json/src/value/mod.rs @@ -0,0 +1,989 @@ +//! The Value enum, a loosely typed way of representing any valid JSON value. +//! +//! # Constructing JSON +//! +//! Serde JSON provides a [`json!` macro][macro] to build `serde_json::Value` +//! objects with very natural JSON syntax. +//! +//! ``` +//! use serde_json::json; +//! +//! fn main() { +//! // The type of `john` is `serde_json::Value` +//! let john = json!({ +//! "name": "John Doe", +//! "age": 43, +//! "phones": [ +//! "+44 1234567", +//! "+44 2345678" +//! ] +//! }); +//! +//! println!("first phone number: {}", john["phones"][0]); +//! +//! // Convert to a string of JSON and print it out +//! println!("{}", john.to_string()); +//! } +//! ``` +//! +//! The `Value::to_string()` function converts a `serde_json::Value` into a +//! `String` of JSON text. +//! +//! One neat thing about the `json!` macro is that variables and expressions can +//! be interpolated directly into the JSON value as you are building it. Serde +//! will check at compile time that the value you are interpolating is able to +//! be represented as JSON. +//! +//! ``` +//! # use serde_json::json; +//! # +//! # fn random_phone() -> u16 { 0 } +//! # +//! let full_name = "John Doe"; +//! let age_last_year = 42; +//! +//! // The type of `john` is `serde_json::Value` +//! let john = json!({ +//! "name": full_name, +//! "age": age_last_year + 1, +//! "phones": [ +//! format!("+44 {}", random_phone()) +//! ] +//! }); +//! ``` +//! +//! A string of JSON data can be parsed into a `serde_json::Value` by the +//! [`serde_json::from_str`][from_str] function. There is also +//! [`from_slice`][from_slice] for parsing from a byte slice `&[u8]` and +//! [`from_reader`][from_reader] for parsing from any `io::Read` like a File or +//! a TCP stream. +//! +//! ``` +//! use serde_json::{json, Value, Error}; +//! +//! fn untyped_example() -> Result<(), Error> { +//! // Some JSON input data as a &str. Maybe this comes from the user. +//! let data = r#" +//! { +//! "name": "John Doe", +//! "age": 43, +//! "phones": [ +//! "+44 1234567", +//! "+44 2345678" +//! ] +//! }"#; +//! +//! // Parse the string of data into serde_json::Value. +//! let v: Value = serde_json::from_str(data)?; +//! +//! // Access parts of the data by indexing with square brackets. +//! println!("Please call {} at the number {}", v["name"], v["phones"][0]); +//! +//! Ok(()) +//! } +//! # +//! # untyped_example().unwrap(); +//! ``` +//! +//! [macro]: https://docs.serde.rs/serde_json/macro.json.html +//! [from_str]: https://docs.serde.rs/serde_json/de/fn.from_str.html +//! [from_slice]: https://docs.serde.rs/serde_json/de/fn.from_slice.html +//! [from_reader]: https://docs.serde.rs/serde_json/de/fn.from_reader.html + +use crate::error::Error; +use crate::io; +use alloc::string::String; +use alloc::vec::Vec; +use core::fmt::{self, Debug, Display}; +use core::mem; +use core::str; +use serde::de::DeserializeOwned; +use serde::ser::Serialize; + +pub use self::index::Index; +pub use self::ser::Serializer; +pub use crate::map::Map; +pub use crate::number::Number; + +#[cfg(feature = "raw_value")] +pub use crate::raw::{to_raw_value, RawValue}; + +/// Represents any valid JSON value. +/// +/// See the [`serde_json::value` module documentation](self) for usage examples. +#[derive(Clone, Eq, PartialEq)] +pub enum Value { + /// Represents a JSON null value. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!(null); + /// ``` + Null, + + /// Represents a JSON boolean. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!(true); + /// ``` + Bool(bool), + + /// Represents a JSON number, whether integer or floating point. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!(12.5); + /// ``` + Number(Number), + + /// Represents a JSON string. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!("a string"); + /// ``` + String(String), + + /// Represents a JSON array. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!(["an", "array"]); + /// ``` + Array(Vec<Value>), + + /// Represents a JSON object. + /// + /// By default the map is backed by a BTreeMap. Enable the `preserve_order` + /// feature of serde_json to use IndexMap instead, which preserves + /// entries in the order they are inserted into the map. In particular, this + /// allows JSON data to be deserialized into a Value and serialized to a + /// string while retaining the order of map keys in the input. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "an": "object" }); + /// ``` + Object(Map<String, Value>), +} + +impl Debug for Value { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + match self { + Value::Null => formatter.debug_tuple("Null").finish(), + Value::Bool(v) => formatter.debug_tuple("Bool").field(v).finish(), + Value::Number(v) => Debug::fmt(v, formatter), + Value::String(v) => formatter.debug_tuple("String").field(v).finish(), + Value::Array(v) => { + formatter.write_str("Array(")?; + Debug::fmt(v, formatter)?; + formatter.write_str(")") + } + Value::Object(v) => { + formatter.write_str("Object(")?; + Debug::fmt(v, formatter)?; + formatter.write_str(")") + } + } + } +} + +impl Display for Value { + /// Display a JSON value as a string. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let json = json!({ "city": "London", "street": "10 Downing Street" }); + /// + /// // Compact format: + /// // + /// // {"city":"London","street":"10 Downing Street"} + /// let compact = format!("{}", json); + /// assert_eq!(compact, + /// "{\"city\":\"London\",\"street\":\"10 Downing Street\"}"); + /// + /// // Pretty format: + /// // + /// // { + /// // "city": "London", + /// // "street": "10 Downing Street" + /// // } + /// let pretty = format!("{:#}", json); + /// assert_eq!(pretty, + /// "{\n \"city\": \"London\",\n \"street\": \"10 Downing Street\"\n}"); + /// ``` + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + struct WriterFormatter<'a, 'b: 'a> { + inner: &'a mut fmt::Formatter<'b>, + } + + impl<'a, 'b> io::Write for WriterFormatter<'a, 'b> { + fn write(&mut self, buf: &[u8]) -> io::Result<usize> { + // Safety: the serializer below only emits valid utf8 when using + // the default formatter. + let s = unsafe { str::from_utf8_unchecked(buf) }; + tri!(self.inner.write_str(s).map_err(io_error)); + Ok(buf.len()) + } + + fn flush(&mut self) -> io::Result<()> { + Ok(()) + } + } + + fn io_error(_: fmt::Error) -> io::Error { + // Error value does not matter because Display impl just maps it + // back to fmt::Error. + io::Error::new(io::ErrorKind::Other, "fmt error") + } + + let alternate = f.alternate(); + let mut wr = WriterFormatter { inner: f }; + if alternate { + // {:#} + super::ser::to_writer_pretty(&mut wr, self).map_err(|_| fmt::Error) + } else { + // {} + super::ser::to_writer(&mut wr, self).map_err(|_| fmt::Error) + } + } +} + +fn parse_index(s: &str) -> Option<usize> { + if s.starts_with('+') || (s.starts_with('0') && s.len() != 1) { + return None; + } + s.parse().ok() +} + +impl Value { + /// Index into a JSON array or map. A string index can be used to access a + /// value in a map, and a usize index can be used to access an element of an + /// array. + /// + /// Returns `None` if the type of `self` does not match the type of the + /// index, for example if the index is a string and `self` is an array or a + /// number. Also returns `None` if the given key does not exist in the map + /// or the given index is not within the bounds of the array. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let object = json!({ "A": 65, "B": 66, "C": 67 }); + /// assert_eq!(*object.get("A").unwrap(), json!(65)); + /// + /// let array = json!([ "A", "B", "C" ]); + /// assert_eq!(*array.get(2).unwrap(), json!("C")); + /// + /// assert_eq!(array.get("A"), None); + /// ``` + /// + /// Square brackets can also be used to index into a value in a more concise + /// way. This returns `Value::Null` in cases where `get` would have returned + /// `None`. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let object = json!({ + /// "A": ["a", "á", "à"], + /// "B": ["b", "b́"], + /// "C": ["c", "ć", "ć̣", "ḉ"], + /// }); + /// assert_eq!(object["B"][0], json!("b")); + /// + /// assert_eq!(object["D"], json!(null)); + /// assert_eq!(object[0]["x"]["y"]["z"], json!(null)); + /// ``` + pub fn get<I: Index>(&self, index: I) -> Option<&Value> { + index.index_into(self) + } + + /// Mutably index into a JSON array or map. A string index can be used to + /// access a value in a map, and a usize index can be used to access an + /// element of an array. + /// + /// Returns `None` if the type of `self` does not match the type of the + /// index, for example if the index is a string and `self` is an array or a + /// number. Also returns `None` if the given key does not exist in the map + /// or the given index is not within the bounds of the array. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut object = json!({ "A": 65, "B": 66, "C": 67 }); + /// *object.get_mut("A").unwrap() = json!(69); + /// + /// let mut array = json!([ "A", "B", "C" ]); + /// *array.get_mut(2).unwrap() = json!("D"); + /// ``` + pub fn get_mut<I: Index>(&mut self, index: I) -> Option<&mut Value> { + index.index_into_mut(self) + } + + /// Returns true if the `Value` is an Object. Returns false otherwise. + /// + /// For any Value on which `is_object` returns true, `as_object` and + /// `as_object_mut` are guaranteed to return the map representation of the + /// object. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let obj = json!({ "a": { "nested": true }, "b": ["an", "array"] }); + /// + /// assert!(obj.is_object()); + /// assert!(obj["a"].is_object()); + /// + /// // array, not an object + /// assert!(!obj["b"].is_object()); + /// ``` + pub fn is_object(&self) -> bool { + self.as_object().is_some() + } + + /// If the `Value` is an Object, returns the associated Map. Returns None + /// otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": { "nested": true }, "b": ["an", "array"] }); + /// + /// // The length of `{"nested": true}` is 1 entry. + /// assert_eq!(v["a"].as_object().unwrap().len(), 1); + /// + /// // The array `["an", "array"]` is not an object. + /// assert_eq!(v["b"].as_object(), None); + /// ``` + pub fn as_object(&self) -> Option<&Map<String, Value>> { + match self { + Value::Object(map) => Some(map), + _ => None, + } + } + + /// If the `Value` is an Object, returns the associated mutable Map. + /// Returns None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut v = json!({ "a": { "nested": true } }); + /// + /// v["a"].as_object_mut().unwrap().clear(); + /// assert_eq!(v, json!({ "a": {} })); + /// ``` + pub fn as_object_mut(&mut self) -> Option<&mut Map<String, Value>> { + match self { + Value::Object(map) => Some(map), + _ => None, + } + } + + /// Returns true if the `Value` is an Array. Returns false otherwise. + /// + /// For any Value on which `is_array` returns true, `as_array` and + /// `as_array_mut` are guaranteed to return the vector representing the + /// array. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let obj = json!({ "a": ["an", "array"], "b": { "an": "object" } }); + /// + /// assert!(obj["a"].is_array()); + /// + /// // an object, not an array + /// assert!(!obj["b"].is_array()); + /// ``` + pub fn is_array(&self) -> bool { + self.as_array().is_some() + } + + /// If the `Value` is an Array, returns the associated vector. Returns None + /// otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": ["an", "array"], "b": { "an": "object" } }); + /// + /// // The length of `["an", "array"]` is 2 elements. + /// assert_eq!(v["a"].as_array().unwrap().len(), 2); + /// + /// // The object `{"an": "object"}` is not an array. + /// assert_eq!(v["b"].as_array(), None); + /// ``` + pub fn as_array(&self) -> Option<&Vec<Value>> { + match self { + Value::Array(array) => Some(array), + _ => None, + } + } + + /// If the `Value` is an Array, returns the associated mutable vector. + /// Returns None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut v = json!({ "a": ["an", "array"] }); + /// + /// v["a"].as_array_mut().unwrap().clear(); + /// assert_eq!(v, json!({ "a": [] })); + /// ``` + pub fn as_array_mut(&mut self) -> Option<&mut Vec<Value>> { + match self { + Value::Array(list) => Some(list), + _ => None, + } + } + + /// Returns true if the `Value` is a String. Returns false otherwise. + /// + /// For any Value on which `is_string` returns true, `as_str` is guaranteed + /// to return the string slice. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": "some string", "b": false }); + /// + /// assert!(v["a"].is_string()); + /// + /// // The boolean `false` is not a string. + /// assert!(!v["b"].is_string()); + /// ``` + pub fn is_string(&self) -> bool { + self.as_str().is_some() + } + + /// If the `Value` is a String, returns the associated str. Returns None + /// otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": "some string", "b": false }); + /// + /// assert_eq!(v["a"].as_str(), Some("some string")); + /// + /// // The boolean `false` is not a string. + /// assert_eq!(v["b"].as_str(), None); + /// + /// // JSON values are printed in JSON representation, so strings are in quotes. + /// // + /// // The value is: "some string" + /// println!("The value is: {}", v["a"]); + /// + /// // Rust strings are printed without quotes. + /// // + /// // The value is: some string + /// println!("The value is: {}", v["a"].as_str().unwrap()); + /// ``` + pub fn as_str(&self) -> Option<&str> { + match self { + Value::String(s) => Some(s), + _ => None, + } + } + + /// Returns true if the `Value` is a Number. Returns false otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 1, "b": "2" }); + /// + /// assert!(v["a"].is_number()); + /// + /// // The string `"2"` is a string, not a number. + /// assert!(!v["b"].is_number()); + /// ``` + pub fn is_number(&self) -> bool { + match *self { + Value::Number(_) => true, + _ => false, + } + } + + /// Returns true if the `Value` is an integer between `i64::MIN` and + /// `i64::MAX`. + /// + /// For any Value on which `is_i64` returns true, `as_i64` is guaranteed to + /// return the integer value. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let big = i64::max_value() as u64 + 10; + /// let v = json!({ "a": 64, "b": big, "c": 256.0 }); + /// + /// assert!(v["a"].is_i64()); + /// + /// // Greater than i64::MAX. + /// assert!(!v["b"].is_i64()); + /// + /// // Numbers with a decimal point are not considered integers. + /// assert!(!v["c"].is_i64()); + /// ``` + pub fn is_i64(&self) -> bool { + match self { + Value::Number(n) => n.is_i64(), + _ => false, + } + } + + /// Returns true if the `Value` is an integer between zero and `u64::MAX`. + /// + /// For any Value on which `is_u64` returns true, `as_u64` is guaranteed to + /// return the integer value. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 64, "b": -64, "c": 256.0 }); + /// + /// assert!(v["a"].is_u64()); + /// + /// // Negative integer. + /// assert!(!v["b"].is_u64()); + /// + /// // Numbers with a decimal point are not considered integers. + /// assert!(!v["c"].is_u64()); + /// ``` + pub fn is_u64(&self) -> bool { + match self { + Value::Number(n) => n.is_u64(), + _ => false, + } + } + + /// Returns true if the `Value` is a number that can be represented by f64. + /// + /// For any Value on which `is_f64` returns true, `as_f64` is guaranteed to + /// return the floating point value. + /// + /// Currently this function returns true if and only if both `is_i64` and + /// `is_u64` return false but this is not a guarantee in the future. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 256.0, "b": 64, "c": -64 }); + /// + /// assert!(v["a"].is_f64()); + /// + /// // Integers. + /// assert!(!v["b"].is_f64()); + /// assert!(!v["c"].is_f64()); + /// ``` + pub fn is_f64(&self) -> bool { + match self { + Value::Number(n) => n.is_f64(), + _ => false, + } + } + + /// If the `Value` is an integer, represent it as i64 if possible. Returns + /// None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let big = i64::max_value() as u64 + 10; + /// let v = json!({ "a": 64, "b": big, "c": 256.0 }); + /// + /// assert_eq!(v["a"].as_i64(), Some(64)); + /// assert_eq!(v["b"].as_i64(), None); + /// assert_eq!(v["c"].as_i64(), None); + /// ``` + pub fn as_i64(&self) -> Option<i64> { + match self { + Value::Number(n) => n.as_i64(), + _ => None, + } + } + + /// If the `Value` is an integer, represent it as u64 if possible. Returns + /// None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 64, "b": -64, "c": 256.0 }); + /// + /// assert_eq!(v["a"].as_u64(), Some(64)); + /// assert_eq!(v["b"].as_u64(), None); + /// assert_eq!(v["c"].as_u64(), None); + /// ``` + pub fn as_u64(&self) -> Option<u64> { + match self { + Value::Number(n) => n.as_u64(), + _ => None, + } + } + + /// If the `Value` is a number, represent it as f64 if possible. Returns + /// None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": 256.0, "b": 64, "c": -64 }); + /// + /// assert_eq!(v["a"].as_f64(), Some(256.0)); + /// assert_eq!(v["b"].as_f64(), Some(64.0)); + /// assert_eq!(v["c"].as_f64(), Some(-64.0)); + /// ``` + pub fn as_f64(&self) -> Option<f64> { + match self { + Value::Number(n) => n.as_f64(), + _ => None, + } + } + + /// Returns true if the `Value` is a Boolean. Returns false otherwise. + /// + /// For any Value on which `is_boolean` returns true, `as_bool` is + /// guaranteed to return the boolean value. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": false, "b": "false" }); + /// + /// assert!(v["a"].is_boolean()); + /// + /// // The string `"false"` is a string, not a boolean. + /// assert!(!v["b"].is_boolean()); + /// ``` + pub fn is_boolean(&self) -> bool { + self.as_bool().is_some() + } + + /// If the `Value` is a Boolean, returns the associated bool. Returns None + /// otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": false, "b": "false" }); + /// + /// assert_eq!(v["a"].as_bool(), Some(false)); + /// + /// // The string `"false"` is a string, not a boolean. + /// assert_eq!(v["b"].as_bool(), None); + /// ``` + pub fn as_bool(&self) -> Option<bool> { + match *self { + Value::Bool(b) => Some(b), + _ => None, + } + } + + /// Returns true if the `Value` is a Null. Returns false otherwise. + /// + /// For any Value on which `is_null` returns true, `as_null` is guaranteed + /// to return `Some(())`. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": null, "b": false }); + /// + /// assert!(v["a"].is_null()); + /// + /// // The boolean `false` is not null. + /// assert!(!v["b"].is_null()); + /// ``` + pub fn is_null(&self) -> bool { + self.as_null().is_some() + } + + /// If the `Value` is a Null, returns (). Returns None otherwise. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let v = json!({ "a": null, "b": false }); + /// + /// assert_eq!(v["a"].as_null(), Some(())); + /// + /// // The boolean `false` is not null. + /// assert_eq!(v["b"].as_null(), None); + /// ``` + pub fn as_null(&self) -> Option<()> { + match *self { + Value::Null => Some(()), + _ => None, + } + } + + /// Looks up a value by a JSON Pointer. + /// + /// JSON Pointer defines a string syntax for identifying a specific value + /// within a JavaScript Object Notation (JSON) document. + /// + /// A Pointer is a Unicode string with the reference tokens separated by `/`. + /// Inside tokens `/` is replaced by `~1` and `~` is replaced by `~0`. The + /// addressed value is returned and if there is no such value `None` is + /// returned. + /// + /// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901). + /// + /// # Examples + /// + /// ``` + /// # use serde_json::json; + /// # + /// let data = json!({ + /// "x": { + /// "y": ["z", "zz"] + /// } + /// }); + /// + /// assert_eq!(data.pointer("/x/y/1").unwrap(), &json!("zz")); + /// assert_eq!(data.pointer("/a/b/c"), None); + /// ``` + pub fn pointer(&self, pointer: &str) -> Option<&Value> { + if pointer.is_empty() { + return Some(self); + } + if !pointer.starts_with('/') { + return None; + } + pointer + .split('/') + .skip(1) + .map(|x| x.replace("~1", "/").replace("~0", "~")) + .try_fold(self, |target, token| match target { + Value::Object(map) => map.get(&token), + Value::Array(list) => parse_index(&token).and_then(|x| list.get(x)), + _ => None, + }) + } + + /// Looks up a value by a JSON Pointer and returns a mutable reference to + /// that value. + /// + /// JSON Pointer defines a string syntax for identifying a specific value + /// within a JavaScript Object Notation (JSON) document. + /// + /// A Pointer is a Unicode string with the reference tokens separated by `/`. + /// Inside tokens `/` is replaced by `~1` and `~` is replaced by `~0`. The + /// addressed value is returned and if there is no such value `None` is + /// returned. + /// + /// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901). + /// + /// # Example of Use + /// + /// ``` + /// use serde_json::Value; + /// + /// fn main() { + /// let s = r#"{"x": 1.0, "y": 2.0}"#; + /// let mut value: Value = serde_json::from_str(s).unwrap(); + /// + /// // Check value using read-only pointer + /// assert_eq!(value.pointer("/x"), Some(&1.0.into())); + /// // Change value with direct assignment + /// *value.pointer_mut("/x").unwrap() = 1.5.into(); + /// // Check that new value was written + /// assert_eq!(value.pointer("/x"), Some(&1.5.into())); + /// // Or change the value only if it exists + /// value.pointer_mut("/x").map(|v| *v = 1.5.into()); + /// + /// // "Steal" ownership of a value. Can replace with any valid Value. + /// let old_x = value.pointer_mut("/x").map(Value::take).unwrap(); + /// assert_eq!(old_x, 1.5); + /// assert_eq!(value.pointer("/x").unwrap(), &Value::Null); + /// } + /// ``` + pub fn pointer_mut(&mut self, pointer: &str) -> Option<&mut Value> { + if pointer.is_empty() { + return Some(self); + } + if !pointer.starts_with('/') { + return None; + } + pointer + .split('/') + .skip(1) + .map(|x| x.replace("~1", "/").replace("~0", "~")) + .try_fold(self, |target, token| match target { + Value::Object(map) => map.get_mut(&token), + Value::Array(list) => parse_index(&token).and_then(move |x| list.get_mut(x)), + _ => None, + }) + } + + /// Takes the value out of the `Value`, leaving a `Null` in its place. + /// + /// ``` + /// # use serde_json::json; + /// # + /// let mut v = json!({ "x": "y" }); + /// assert_eq!(v["x"].take(), json!("y")); + /// assert_eq!(v, json!({ "x": null })); + /// ``` + pub fn take(&mut self) -> Value { + mem::replace(self, Value::Null) + } +} + +/// The default value is `Value::Null`. +/// +/// This is useful for handling omitted `Value` fields when deserializing. +/// +/// # Examples +/// +/// ``` +/// # use serde::Deserialize; +/// use serde_json::Value; +/// +/// #[derive(Deserialize)] +/// struct Settings { +/// level: i32, +/// #[serde(default)] +/// extras: Value, +/// } +/// +/// # fn try_main() -> Result<(), serde_json::Error> { +/// let data = r#" { "level": 42 } "#; +/// let s: Settings = serde_json::from_str(data)?; +/// +/// assert_eq!(s.level, 42); +/// assert_eq!(s.extras, Value::Null); +/// # +/// # Ok(()) +/// # } +/// # +/// # try_main().unwrap() +/// ``` +impl Default for Value { + fn default() -> Value { + Value::Null + } +} + +mod de; +mod from; +mod index; +mod partial_eq; +mod ser; + +/// Convert a `T` into `serde_json::Value` which is an enum that can represent +/// any valid JSON data. +/// +/// # Example +/// +/// ``` +/// use serde::Serialize; +/// use serde_json::json; +/// +/// use std::error::Error; +/// +/// #[derive(Serialize)] +/// struct User { +/// fingerprint: String, +/// location: String, +/// } +/// +/// fn compare_json_values() -> Result<(), Box<Error>> { +/// let u = User { +/// fingerprint: "0xF9BA143B95FF6D82".to_owned(), +/// location: "Menlo Park, CA".to_owned(), +/// }; +/// +/// // The type of `expected` is `serde_json::Value` +/// let expected = json!({ +/// "fingerprint": "0xF9BA143B95FF6D82", +/// "location": "Menlo Park, CA", +/// }); +/// +/// let v = serde_json::to_value(u).unwrap(); +/// assert_eq!(v, expected); +/// +/// Ok(()) +/// } +/// # +/// # compare_json_values().unwrap(); +/// ``` +/// +/// # Errors +/// +/// This conversion can fail if `T`'s implementation of `Serialize` decides to +/// fail, or if `T` contains a map with non-string keys. +/// +/// ``` +/// use std::collections::BTreeMap; +/// +/// fn main() { +/// // The keys in this map are vectors, not strings. +/// let mut map = BTreeMap::new(); +/// map.insert(vec![32, 64], "x86"); +/// +/// println!("{}", serde_json::to_value(map).unwrap_err()); +/// } +/// ``` +// Taking by value is more friendly to iterator adapters, option and result +// consumers, etc. See https://github.com/serde-rs/json/pull/149. +pub fn to_value<T>(value: T) -> Result<Value, Error> +where + T: Serialize, +{ + value.serialize(Serializer) +} + +/// Interpret a `serde_json::Value` as an instance of type `T`. +/// +/// # Example +/// +/// ``` +/// use serde::Deserialize; +/// use serde_json::json; +/// +/// #[derive(Deserialize, Debug)] +/// struct User { +/// fingerprint: String, +/// location: String, +/// } +/// +/// fn main() { +/// // The type of `j` is `serde_json::Value` +/// let j = json!({ +/// "fingerprint": "0xF9BA143B95FF6D82", +/// "location": "Menlo Park, CA" +/// }); +/// +/// let u: User = serde_json::from_value(j).unwrap(); +/// println!("{:#?}", u); +/// } +/// ``` +/// +/// # Errors +/// +/// This conversion can fail if the structure of the Value does not match the +/// structure expected by `T`, for example if `T` is a struct type but the Value +/// contains something other than a JSON map. It can also fail if the structure +/// is correct but `T`'s implementation of `Deserialize` decides that something +/// is wrong with the data, for example required struct fields are missing from +/// the JSON map or some number is too big to fit in the expected primitive +/// type. +pub fn from_value<T>(value: Value) -> Result<T, Error> +where + T: DeserializeOwned, +{ + T::deserialize(value) +} diff --git a/vendor/serde_json/src/value/partial_eq.rs b/vendor/serde_json/src/value/partial_eq.rs new file mode 100644 index 000000000..b4ef84c4f --- /dev/null +++ b/vendor/serde_json/src/value/partial_eq.rs @@ -0,0 +1,95 @@ +use super::Value; +use alloc::string::String; + +fn eq_i64(value: &Value, other: i64) -> bool { + value.as_i64().map_or(false, |i| i == other) +} + +fn eq_u64(value: &Value, other: u64) -> bool { + value.as_u64().map_or(false, |i| i == other) +} + +fn eq_f64(value: &Value, other: f64) -> bool { + value.as_f64().map_or(false, |i| i == other) +} + +fn eq_bool(value: &Value, other: bool) -> bool { + value.as_bool().map_or(false, |i| i == other) +} + +fn eq_str(value: &Value, other: &str) -> bool { + value.as_str().map_or(false, |i| i == other) +} + +impl PartialEq<str> for Value { + fn eq(&self, other: &str) -> bool { + eq_str(self, other) + } +} + +impl<'a> PartialEq<&'a str> for Value { + fn eq(&self, other: &&str) -> bool { + eq_str(self, *other) + } +} + +impl PartialEq<Value> for str { + fn eq(&self, other: &Value) -> bool { + eq_str(other, self) + } +} + +impl<'a> PartialEq<Value> for &'a str { + fn eq(&self, other: &Value) -> bool { + eq_str(other, *self) + } +} + +impl PartialEq<String> for Value { + fn eq(&self, other: &String) -> bool { + eq_str(self, other.as_str()) + } +} + +impl PartialEq<Value> for String { + fn eq(&self, other: &Value) -> bool { + eq_str(other, self.as_str()) + } +} + +macro_rules! partialeq_numeric { + ($($eq:ident [$($ty:ty)*])*) => { + $($( + impl PartialEq<$ty> for Value { + fn eq(&self, other: &$ty) -> bool { + $eq(self, *other as _) + } + } + + impl PartialEq<Value> for $ty { + fn eq(&self, other: &Value) -> bool { + $eq(other, *self as _) + } + } + + impl<'a> PartialEq<$ty> for &'a Value { + fn eq(&self, other: &$ty) -> bool { + $eq(*self, *other as _) + } + } + + impl<'a> PartialEq<$ty> for &'a mut Value { + fn eq(&self, other: &$ty) -> bool { + $eq(*self, *other as _) + } + } + )*)* + } +} + +partialeq_numeric! { + eq_i64[i8 i16 i32 i64 isize] + eq_u64[u8 u16 u32 u64 usize] + eq_f64[f32 f64] + eq_bool[bool] +} diff --git a/vendor/serde_json/src/value/ser.rs b/vendor/serde_json/src/value/ser.rs new file mode 100644 index 000000000..c142dacbf --- /dev/null +++ b/vendor/serde_json/src/value/ser.rs @@ -0,0 +1,1025 @@ +use crate::error::{Error, ErrorCode, Result}; +use crate::map::Map; +use crate::number::Number; +use crate::value::{to_value, Value}; +use alloc::borrow::ToOwned; +use alloc::string::{String, ToString}; +use alloc::vec::Vec; +use core::fmt::Display; +use core::result; +use serde::ser::{Impossible, Serialize}; + +#[cfg(feature = "arbitrary_precision")] +use serde::serde_if_integer128; + +impl Serialize for Value { + #[inline] + fn serialize<S>(&self, serializer: S) -> result::Result<S::Ok, S::Error> + where + S: ::serde::Serializer, + { + match self { + Value::Null => serializer.serialize_unit(), + Value::Bool(b) => serializer.serialize_bool(*b), + Value::Number(n) => n.serialize(serializer), + Value::String(s) => serializer.serialize_str(s), + Value::Array(v) => v.serialize(serializer), + #[cfg(any(feature = "std", feature = "alloc"))] + Value::Object(m) => { + use serde::ser::SerializeMap; + let mut map = tri!(serializer.serialize_map(Some(m.len()))); + for (k, v) in m { + tri!(map.serialize_entry(k, v)); + } + map.end() + } + } + } +} + +/// Serializer whose output is a `Value`. +/// +/// This is the serializer that backs [`serde_json::to_value`][crate::to_value]. +/// Unlike the main serde_json serializer which goes from some serializable +/// value of type `T` to JSON text, this one goes from `T` to +/// `serde_json::Value`. +/// +/// The `to_value` function is implementable as: +/// +/// ``` +/// use serde::Serialize; +/// use serde_json::{Error, Value}; +/// +/// pub fn to_value<T>(input: T) -> Result<Value, Error> +/// where +/// T: Serialize, +/// { +/// input.serialize(serde_json::value::Serializer) +/// } +/// ``` +pub struct Serializer; + +impl serde::Serializer for Serializer { + type Ok = Value; + type Error = Error; + + type SerializeSeq = SerializeVec; + type SerializeTuple = SerializeVec; + type SerializeTupleStruct = SerializeVec; + type SerializeTupleVariant = SerializeTupleVariant; + type SerializeMap = SerializeMap; + type SerializeStruct = SerializeMap; + type SerializeStructVariant = SerializeStructVariant; + + #[inline] + fn serialize_bool(self, value: bool) -> Result<Value> { + Ok(Value::Bool(value)) + } + + #[inline] + fn serialize_i8(self, value: i8) -> Result<Value> { + self.serialize_i64(value as i64) + } + + #[inline] + fn serialize_i16(self, value: i16) -> Result<Value> { + self.serialize_i64(value as i64) + } + + #[inline] + fn serialize_i32(self, value: i32) -> Result<Value> { + self.serialize_i64(value as i64) + } + + fn serialize_i64(self, value: i64) -> Result<Value> { + Ok(Value::Number(value.into())) + } + + #[cfg(feature = "arbitrary_precision")] + serde_if_integer128! { + fn serialize_i128(self, value: i128) -> Result<Value> { + Ok(Value::Number(value.into())) + } + } + + #[inline] + fn serialize_u8(self, value: u8) -> Result<Value> { + self.serialize_u64(value as u64) + } + + #[inline] + fn serialize_u16(self, value: u16) -> Result<Value> { + self.serialize_u64(value as u64) + } + + #[inline] + fn serialize_u32(self, value: u32) -> Result<Value> { + self.serialize_u64(value as u64) + } + + #[inline] + fn serialize_u64(self, value: u64) -> Result<Value> { + Ok(Value::Number(value.into())) + } + + #[cfg(feature = "arbitrary_precision")] + serde_if_integer128! { + fn serialize_u128(self, value: u128) -> Result<Value> { + Ok(Value::Number(value.into())) + } + } + + #[inline] + fn serialize_f32(self, value: f32) -> Result<Value> { + self.serialize_f64(value as f64) + } + + #[inline] + fn serialize_f64(self, value: f64) -> Result<Value> { + Ok(Number::from_f64(value).map_or(Value::Null, Value::Number)) + } + + #[inline] + fn serialize_char(self, value: char) -> Result<Value> { + let mut s = String::new(); + s.push(value); + Ok(Value::String(s)) + } + + #[inline] + fn serialize_str(self, value: &str) -> Result<Value> { + Ok(Value::String(value.to_owned())) + } + + fn serialize_bytes(self, value: &[u8]) -> Result<Value> { + let vec = value.iter().map(|&b| Value::Number(b.into())).collect(); + Ok(Value::Array(vec)) + } + + #[inline] + fn serialize_unit(self) -> Result<Value> { + Ok(Value::Null) + } + + #[inline] + fn serialize_unit_struct(self, _name: &'static str) -> Result<Value> { + self.serialize_unit() + } + + #[inline] + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + ) -> Result<Value> { + self.serialize_str(variant) + } + + #[inline] + fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<Value> + where + T: ?Sized + Serialize, + { + value.serialize(self) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + value: &T, + ) -> Result<Value> + where + T: ?Sized + Serialize, + { + let mut values = Map::new(); + values.insert(String::from(variant), tri!(to_value(&value))); + Ok(Value::Object(values)) + } + + #[inline] + fn serialize_none(self) -> Result<Value> { + self.serialize_unit() + } + + #[inline] + fn serialize_some<T>(self, value: &T) -> Result<Value> + where + T: ?Sized + Serialize, + { + value.serialize(self) + } + + fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> { + Ok(SerializeVec { + vec: Vec::with_capacity(len.unwrap_or(0)), + }) + } + + fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> { + self.serialize_seq(Some(len)) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleStruct> { + self.serialize_seq(Some(len)) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Ok(SerializeTupleVariant { + name: String::from(variant), + vec: Vec::with_capacity(len), + }) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Ok(SerializeMap::Map { + map: Map::new(), + next_key: None, + }) + } + + fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct> { + match name { + #[cfg(feature = "arbitrary_precision")] + crate::number::TOKEN => Ok(SerializeMap::Number { out_value: None }), + #[cfg(feature = "raw_value")] + crate::raw::TOKEN => Ok(SerializeMap::RawValue { out_value: None }), + _ => self.serialize_map(Some(len)), + } + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Ok(SerializeStructVariant { + name: String::from(variant), + map: Map::new(), + }) + } + + fn collect_str<T>(self, value: &T) -> Result<Value> + where + T: ?Sized + Display, + { + Ok(Value::String(value.to_string())) + } +} + +pub struct SerializeVec { + vec: Vec<Value>, +} + +pub struct SerializeTupleVariant { + name: String, + vec: Vec<Value>, +} + +pub enum SerializeMap { + Map { + map: Map<String, Value>, + next_key: Option<String>, + }, + #[cfg(feature = "arbitrary_precision")] + Number { out_value: Option<Value> }, + #[cfg(feature = "raw_value")] + RawValue { out_value: Option<Value> }, +} + +pub struct SerializeStructVariant { + name: String, + map: Map<String, Value>, +} + +impl serde::ser::SerializeSeq for SerializeVec { + type Ok = Value; + type Error = Error; + + fn serialize_element<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + self.vec.push(tri!(to_value(&value))); + Ok(()) + } + + fn end(self) -> Result<Value> { + Ok(Value::Array(self.vec)) + } +} + +impl serde::ser::SerializeTuple for SerializeVec { + type Ok = Value; + type Error = Error; + + fn serialize_element<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + serde::ser::SerializeSeq::serialize_element(self, value) + } + + fn end(self) -> Result<Value> { + serde::ser::SerializeSeq::end(self) + } +} + +impl serde::ser::SerializeTupleStruct for SerializeVec { + type Ok = Value; + type Error = Error; + + fn serialize_field<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + serde::ser::SerializeSeq::serialize_element(self, value) + } + + fn end(self) -> Result<Value> { + serde::ser::SerializeSeq::end(self) + } +} + +impl serde::ser::SerializeTupleVariant for SerializeTupleVariant { + type Ok = Value; + type Error = Error; + + fn serialize_field<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + self.vec.push(tri!(to_value(&value))); + Ok(()) + } + + fn end(self) -> Result<Value> { + let mut object = Map::new(); + + object.insert(self.name, Value::Array(self.vec)); + + Ok(Value::Object(object)) + } +} + +impl serde::ser::SerializeMap for SerializeMap { + type Ok = Value; + type Error = Error; + + fn serialize_key<T>(&mut self, key: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + SerializeMap::Map { next_key, .. } => { + *next_key = Some(tri!(key.serialize(MapKeySerializer))); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + SerializeMap::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + SerializeMap::RawValue { .. } => unreachable!(), + } + } + + fn serialize_value<T>(&mut self, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + SerializeMap::Map { map, next_key } => { + let key = next_key.take(); + // Panic because this indicates a bug in the program rather than an + // expected failure. + let key = key.expect("serialize_value called before serialize_key"); + map.insert(key, tri!(to_value(&value))); + Ok(()) + } + #[cfg(feature = "arbitrary_precision")] + SerializeMap::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + SerializeMap::RawValue { .. } => unreachable!(), + } + } + + fn end(self) -> Result<Value> { + match self { + SerializeMap::Map { map, .. } => Ok(Value::Object(map)), + #[cfg(feature = "arbitrary_precision")] + SerializeMap::Number { .. } => unreachable!(), + #[cfg(feature = "raw_value")] + SerializeMap::RawValue { .. } => unreachable!(), + } + } +} + +struct MapKeySerializer; + +fn key_must_be_a_string() -> Error { + Error::syntax(ErrorCode::KeyMustBeAString, 0, 0) +} + +impl serde::Serializer for MapKeySerializer { + type Ok = String; + type Error = Error; + + type SerializeSeq = Impossible<String, Error>; + type SerializeTuple = Impossible<String, Error>; + type SerializeTupleStruct = Impossible<String, Error>; + type SerializeTupleVariant = Impossible<String, Error>; + type SerializeMap = Impossible<String, Error>; + type SerializeStruct = Impossible<String, Error>; + type SerializeStructVariant = Impossible<String, Error>; + + #[inline] + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + variant: &'static str, + ) -> Result<String> { + Ok(variant.to_owned()) + } + + #[inline] + fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<String> + where + T: ?Sized + Serialize, + { + value.serialize(self) + } + + fn serialize_bool(self, _value: bool) -> Result<String> { + Err(key_must_be_a_string()) + } + + fn serialize_i8(self, value: i8) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_i16(self, value: i16) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_i32(self, value: i32) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_i64(self, value: i64) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_u8(self, value: u8) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_u16(self, value: u16) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_u32(self, value: u32) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_u64(self, value: u64) -> Result<String> { + Ok(value.to_string()) + } + + fn serialize_f32(self, _value: f32) -> Result<String> { + Err(key_must_be_a_string()) + } + + fn serialize_f64(self, _value: f64) -> Result<String> { + Err(key_must_be_a_string()) + } + + #[inline] + fn serialize_char(self, value: char) -> Result<String> { + Ok({ + let mut s = String::new(); + s.push(value); + s + }) + } + + #[inline] + fn serialize_str(self, value: &str) -> Result<String> { + Ok(value.to_owned()) + } + + fn serialize_bytes(self, _value: &[u8]) -> Result<String> { + Err(key_must_be_a_string()) + } + + fn serialize_unit(self) -> Result<String> { + Err(key_must_be_a_string()) + } + + fn serialize_unit_struct(self, _name: &'static str) -> Result<String> { + Err(key_must_be_a_string()) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> Result<String> + where + T: ?Sized + Serialize, + { + Err(key_must_be_a_string()) + } + + fn serialize_none(self) -> Result<String> { + Err(key_must_be_a_string()) + } + + fn serialize_some<T>(self, _value: &T) -> Result<String> + where + T: ?Sized + Serialize, + { + Err(key_must_be_a_string()) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { + Err(key_must_be_a_string()) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { + Err(key_must_be_a_string()) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct> { + Err(key_must_be_a_string()) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Err(key_must_be_a_string()) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Err(key_must_be_a_string()) + } + + fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { + Err(key_must_be_a_string()) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Err(key_must_be_a_string()) + } + + fn collect_str<T>(self, value: &T) -> Result<String> + where + T: ?Sized + Display, + { + Ok(value.to_string()) + } +} + +impl serde::ser::SerializeStruct for SerializeMap { + type Ok = Value; + type Error = Error; + + fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + match self { + SerializeMap::Map { .. } => serde::ser::SerializeMap::serialize_entry(self, key, value), + #[cfg(feature = "arbitrary_precision")] + SerializeMap::Number { out_value } => { + if key == crate::number::TOKEN { + *out_value = Some(value.serialize(NumberValueEmitter)?); + Ok(()) + } else { + Err(invalid_number()) + } + } + #[cfg(feature = "raw_value")] + SerializeMap::RawValue { out_value } => { + if key == crate::raw::TOKEN { + *out_value = Some(value.serialize(RawValueEmitter)?); + Ok(()) + } else { + Err(invalid_raw_value()) + } + } + } + } + + fn end(self) -> Result<Value> { + match self { + SerializeMap::Map { .. } => serde::ser::SerializeMap::end(self), + #[cfg(feature = "arbitrary_precision")] + SerializeMap::Number { out_value, .. } => { + Ok(out_value.expect("number value was not emitted")) + } + #[cfg(feature = "raw_value")] + SerializeMap::RawValue { out_value, .. } => { + Ok(out_value.expect("raw value was not emitted")) + } + } + } +} + +impl serde::ser::SerializeStructVariant for SerializeStructVariant { + type Ok = Value; + type Error = Error; + + fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()> + where + T: ?Sized + Serialize, + { + self.map.insert(String::from(key), tri!(to_value(&value))); + Ok(()) + } + + fn end(self) -> Result<Value> { + let mut object = Map::new(); + + object.insert(self.name, Value::Object(self.map)); + + Ok(Value::Object(object)) + } +} + +#[cfg(feature = "arbitrary_precision")] +struct NumberValueEmitter; + +#[cfg(feature = "arbitrary_precision")] +fn invalid_number() -> Error { + Error::syntax(ErrorCode::InvalidNumber, 0, 0) +} + +#[cfg(feature = "arbitrary_precision")] +impl serde::ser::Serializer for NumberValueEmitter { + type Ok = Value; + type Error = Error; + + type SerializeSeq = Impossible<Value, Error>; + type SerializeTuple = Impossible<Value, Error>; + type SerializeTupleStruct = Impossible<Value, Error>; + type SerializeTupleVariant = Impossible<Value, Error>; + type SerializeMap = Impossible<Value, Error>; + type SerializeStruct = Impossible<Value, Error>; + type SerializeStructVariant = Impossible<Value, Error>; + + fn serialize_bool(self, _v: bool) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_i8(self, _v: i8) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_i16(self, _v: i16) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_i32(self, _v: i32) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_i64(self, _v: i64) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_u8(self, _v: u8) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_u16(self, _v: u16) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_u32(self, _v: u32) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_u64(self, _v: u64) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_f32(self, _v: f32) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_f64(self, _v: f64) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_char(self, _v: char) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_str(self, value: &str) -> Result<Value> { + let n = tri!(value.to_owned().parse()); + Ok(Value::Number(n)) + } + + fn serialize_bytes(self, _value: &[u8]) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_none(self) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_some<T>(self, _value: &T) -> Result<Value> + where + T: ?Sized + Serialize, + { + Err(invalid_number()) + } + + fn serialize_unit(self) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_unit_struct(self, _name: &'static str) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + ) -> Result<Value> { + Err(invalid_number()) + } + + fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<Value> + where + T: ?Sized + Serialize, + { + Err(invalid_number()) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> Result<Value> + where + T: ?Sized + Serialize, + { + Err(invalid_number()) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { + Err(invalid_number()) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { + Err(invalid_number()) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct> { + Err(invalid_number()) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Err(invalid_number()) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Err(invalid_number()) + } + + fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { + Err(invalid_number()) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Err(invalid_number()) + } +} + +#[cfg(feature = "raw_value")] +struct RawValueEmitter; + +#[cfg(feature = "raw_value")] +fn invalid_raw_value() -> Error { + Error::syntax(ErrorCode::ExpectedSomeValue, 0, 0) +} + +#[cfg(feature = "raw_value")] +impl serde::ser::Serializer for RawValueEmitter { + type Ok = Value; + type Error = Error; + + type SerializeSeq = Impossible<Value, Error>; + type SerializeTuple = Impossible<Value, Error>; + type SerializeTupleStruct = Impossible<Value, Error>; + type SerializeTupleVariant = Impossible<Value, Error>; + type SerializeMap = Impossible<Value, Error>; + type SerializeStruct = Impossible<Value, Error>; + type SerializeStructVariant = Impossible<Value, Error>; + + fn serialize_bool(self, _v: bool) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_i8(self, _v: i8) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_i16(self, _v: i16) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_i32(self, _v: i32) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_i64(self, _v: i64) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_u8(self, _v: u8) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_u16(self, _v: u16) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_u32(self, _v: u32) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_u64(self, _v: u64) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_f32(self, _v: f32) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_f64(self, _v: f64) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_char(self, _v: char) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_str(self, value: &str) -> Result<Value> { + crate::from_str(value) + } + + fn serialize_bytes(self, _value: &[u8]) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_none(self) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_some<T>(self, _value: &T) -> Result<Value> + where + T: ?Sized + Serialize, + { + Err(invalid_raw_value()) + } + + fn serialize_unit(self) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_unit_struct(self, _name: &'static str) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_unit_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + ) -> Result<Value> { + Err(invalid_raw_value()) + } + + fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<Value> + where + T: ?Sized + Serialize, + { + Err(invalid_raw_value()) + } + + fn serialize_newtype_variant<T>( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _value: &T, + ) -> Result<Value> + where + T: ?Sized + Serialize, + { + Err(invalid_raw_value()) + } + + fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { + Err(invalid_raw_value()) + } + + fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { + Err(invalid_raw_value()) + } + + fn serialize_tuple_struct( + self, + _name: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleStruct> { + Err(invalid_raw_value()) + } + + fn serialize_tuple_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeTupleVariant> { + Err(invalid_raw_value()) + } + + fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { + Err(invalid_raw_value()) + } + + fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { + Err(invalid_raw_value()) + } + + fn serialize_struct_variant( + self, + _name: &'static str, + _variant_index: u32, + _variant: &'static str, + _len: usize, + ) -> Result<Self::SerializeStructVariant> { + Err(invalid_raw_value()) + } + + fn collect_str<T>(self, value: &T) -> Result<Self::Ok> + where + T: ?Sized + Display, + { + self.serialize_str(&value.to_string()) + } +} diff --git a/vendor/serde_json/tests/compiletest.rs b/vendor/serde_json/tests/compiletest.rs new file mode 100644 index 000000000..7974a6249 --- /dev/null +++ b/vendor/serde_json/tests/compiletest.rs @@ -0,0 +1,7 @@ +#[rustversion::attr(not(nightly), ignore)] +#[cfg_attr(miri, ignore)] +#[test] +fn ui() { + let t = trybuild::TestCases::new(); + t.compile_fail("tests/ui/*.rs"); +} diff --git a/vendor/serde_json/tests/debug.rs b/vendor/serde_json/tests/debug.rs new file mode 100644 index 000000000..d2d8448be --- /dev/null +++ b/vendor/serde_json/tests/debug.rs @@ -0,0 +1,68 @@ +use serde_json::{json, Number, Value}; + +#[test] +fn number() { + assert_eq!(format!("{:?}", Number::from(1)), "Number(1)"); + assert_eq!(format!("{:?}", Number::from(-1)), "Number(-1)"); + assert_eq!( + format!("{:?}", Number::from_f64(1.0).unwrap()), + "Number(1.0)" + ); +} + +#[test] +fn value_null() { + assert_eq!(format!("{:?}", json!(null)), "Null"); +} + +#[test] +fn value_bool() { + assert_eq!(format!("{:?}", json!(true)), "Bool(true)"); + assert_eq!(format!("{:?}", json!(false)), "Bool(false)"); +} + +#[test] +fn value_number() { + assert_eq!(format!("{:?}", json!(1)), "Number(1)"); + assert_eq!(format!("{:?}", json!(-1)), "Number(-1)"); + assert_eq!(format!("{:?}", json!(1.0)), "Number(1.0)"); +} + +#[test] +fn value_string() { + assert_eq!(format!("{:?}", json!("s")), "String(\"s\")"); +} + +#[test] +fn value_array() { + assert_eq!(format!("{:?}", json!([])), "Array([])"); +} + +#[test] +fn value_object() { + assert_eq!(format!("{:?}", json!({})), "Object({})"); +} + +#[test] +fn error() { + let err = serde_json::from_str::<Value>("{0}").unwrap_err(); + let expected = "Error(\"key must be a string\", line: 1, column: 2)"; + assert_eq!(format!("{:?}", err), expected); +} + +const INDENTED_EXPECTED: &str = r#"Object({ + "array": Array([ + Number( + 0, + ), + Number( + 1, + ), + ]), +})"#; + +#[test] +fn indented() { + let j = json!({ "array": [0, 1] }); + assert_eq!(format!("{:#?}", j), INDENTED_EXPECTED); +} diff --git a/vendor/serde_json/tests/lexical.rs b/vendor/serde_json/tests/lexical.rs new file mode 100644 index 000000000..6e0f07b8c --- /dev/null +++ b/vendor/serde_json/tests/lexical.rs @@ -0,0 +1,52 @@ +#![allow( + clippy::cast_lossless, + clippy::cast_possible_truncation, + clippy::cast_possible_wrap, + clippy::cast_precision_loss, + clippy::cast_sign_loss, + clippy::comparison_chain, + clippy::doc_markdown, + clippy::excessive_precision, + clippy::float_cmp, + clippy::if_not_else, + clippy::module_name_repetitions, + clippy::needless_late_init, + clippy::shadow_unrelated, + clippy::similar_names, + clippy::single_match_else, + clippy::too_many_lines, + clippy::unreadable_literal, + clippy::unseparated_literal_suffix, + clippy::wildcard_imports +)] + +extern crate alloc; + +#[path = "../src/lexical/mod.rs"] +mod lexical; + +mod lib { + pub use std::vec::Vec; + pub use std::{cmp, iter, mem, ops}; +} + +#[path = "lexical/algorithm.rs"] +mod algorithm; + +#[path = "lexical/exponent.rs"] +mod exponent; + +#[path = "lexical/float.rs"] +mod float; + +#[path = "lexical/math.rs"] +mod math; + +#[path = "lexical/num.rs"] +mod num; + +#[path = "lexical/parse.rs"] +mod parse; + +#[path = "lexical/rounding.rs"] +mod rounding; diff --git a/vendor/serde_json/tests/lexical/algorithm.rs b/vendor/serde_json/tests/lexical/algorithm.rs new file mode 100644 index 000000000..7f3a2c624 --- /dev/null +++ b/vendor/serde_json/tests/lexical/algorithm.rs @@ -0,0 +1,110 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::algorithm::*; +use crate::lexical::num::Float; + +#[test] +fn float_fast_path_test() { + // valid + let mantissa = (1 << f32::MANTISSA_SIZE) - 1; + let (min_exp, max_exp) = f32::exponent_limit(); + for exp in min_exp..=max_exp { + let f = fast_path::<f32>(mantissa, exp); + assert!(f.is_some(), "should be valid {:?}.", (mantissa, exp)); + } + + // Check slightly above valid exponents + let f = fast_path::<f32>(123, 15); + assert_eq!(f, Some(1.23e+17)); + + // Exponent is 1 too high, pushes over the mantissa. + let f = fast_path::<f32>(123, 16); + assert!(f.is_none()); + + // Mantissa is too large, checked_mul should overflow. + let f = fast_path::<f32>(mantissa, 11); + assert!(f.is_none()); + + // invalid exponents + let (min_exp, max_exp) = f32::exponent_limit(); + let f = fast_path::<f32>(mantissa, min_exp - 1); + assert!(f.is_none(), "exponent under min_exp"); + + let f = fast_path::<f32>(mantissa, max_exp + 1); + assert!(f.is_none(), "exponent above max_exp"); +} + +#[test] +fn double_fast_path_test() { + // valid + let mantissa = (1 << f64::MANTISSA_SIZE) - 1; + let (min_exp, max_exp) = f64::exponent_limit(); + for exp in min_exp..=max_exp { + let f = fast_path::<f64>(mantissa, exp); + assert!(f.is_some(), "should be valid {:?}.", (mantissa, exp)); + } + + // invalid exponents + let (min_exp, max_exp) = f64::exponent_limit(); + let f = fast_path::<f64>(mantissa, min_exp - 1); + assert!(f.is_none(), "exponent under min_exp"); + + let f = fast_path::<f64>(mantissa, max_exp + 1); + assert!(f.is_none(), "exponent above max_exp"); + + assert_eq!( + Some(0.04628372940652459), + fast_path::<f64>(4628372940652459, -17) + ); + assert_eq!(None, fast_path::<f64>(26383446160308229, -272)); +} + +#[test] +fn moderate_path_test() { + let (f, valid) = moderate_path::<f64>(1234567890, -1, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.0); + + let (f, valid) = moderate_path::<f64>(1234567891, -1, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.1); + + let (f, valid) = moderate_path::<f64>(12345678912, -2, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.12); + + let (f, valid) = moderate_path::<f64>(123456789123, -3, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.123); + + let (f, valid) = moderate_path::<f64>(1234567891234, -4, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.1234); + + let (f, valid) = moderate_path::<f64>(12345678912345, -5, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.12345); + + let (f, valid) = moderate_path::<f64>(123456789123456, -6, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.123456); + + let (f, valid) = moderate_path::<f64>(1234567891234567, -7, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.1234567); + + let (f, valid) = moderate_path::<f64>(12345678912345679, -8, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 123456789.12345679); + + let (f, valid) = moderate_path::<f64>(4628372940652459, -17, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 0.04628372940652459); + + let (f, valid) = moderate_path::<f64>(26383446160308229, -272, false); + assert!(valid, "should be valid"); + assert_eq!(f.into_float::<f64>(), 2.6383446160308229e-256); + + let (_, valid) = moderate_path::<f64>(26383446160308230, -272, false); + assert!(!valid, "should be invalid"); +} diff --git a/vendor/serde_json/tests/lexical/exponent.rs b/vendor/serde_json/tests/lexical/exponent.rs new file mode 100644 index 000000000..f7a847be3 --- /dev/null +++ b/vendor/serde_json/tests/lexical/exponent.rs @@ -0,0 +1,54 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::exponent::*; + +#[test] +fn scientific_exponent_test() { + // 0 digits in the integer + assert_eq!(scientific_exponent(0, 0, 5), -6); + assert_eq!(scientific_exponent(10, 0, 5), 4); + assert_eq!(scientific_exponent(-10, 0, 5), -16); + + // >0 digits in the integer + assert_eq!(scientific_exponent(0, 1, 5), 0); + assert_eq!(scientific_exponent(0, 2, 5), 1); + assert_eq!(scientific_exponent(0, 2, 20), 1); + assert_eq!(scientific_exponent(10, 2, 20), 11); + assert_eq!(scientific_exponent(-10, 2, 20), -9); + + // Underflow + assert_eq!( + scientific_exponent(i32::min_value(), 0, 0), + i32::min_value() + ); + assert_eq!( + scientific_exponent(i32::min_value(), 0, 5), + i32::min_value() + ); + + // Overflow + assert_eq!( + scientific_exponent(i32::max_value(), 0, 0), + i32::max_value() - 1 + ); + assert_eq!( + scientific_exponent(i32::max_value(), 5, 0), + i32::max_value() + ); +} + +#[test] +fn mantissa_exponent_test() { + assert_eq!(mantissa_exponent(10, 5, 0), 5); + assert_eq!(mantissa_exponent(0, 5, 0), -5); + assert_eq!( + mantissa_exponent(i32::max_value(), 5, 0), + i32::max_value() - 5 + ); + assert_eq!(mantissa_exponent(i32::max_value(), 0, 5), i32::max_value()); + assert_eq!(mantissa_exponent(i32::min_value(), 5, 0), i32::min_value()); + assert_eq!( + mantissa_exponent(i32::min_value(), 0, 5), + i32::min_value() + 5 + ); +} diff --git a/vendor/serde_json/tests/lexical/float.rs b/vendor/serde_json/tests/lexical/float.rs new file mode 100644 index 000000000..c87e7e1ed --- /dev/null +++ b/vendor/serde_json/tests/lexical/float.rs @@ -0,0 +1,581 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::float::ExtendedFloat; +use crate::lexical::rounding::round_nearest_tie_even; +use std::{f32, f64}; + +// NORMALIZE + +fn check_normalize(mant: u64, exp: i32, shift: u32, r_mant: u64, r_exp: i32) { + let mut x = ExtendedFloat { mant, exp }; + assert_eq!(x.normalize(), shift); + assert_eq!( + x, + ExtendedFloat { + mant: r_mant, + exp: r_exp + } + ); +} + +#[test] +fn normalize_test() { + // F32 + // 0 + check_normalize(0, 0, 0, 0, 0); + + // min value + check_normalize(1, -149, 63, 9223372036854775808, -212); + + // 1.0e-40 + check_normalize(71362, -149, 47, 10043308644012916736, -196); + + // 1.0e-20 + check_normalize(12379400, -90, 40, 13611294244890214400, -130); + + // 1.0 + check_normalize(8388608, -23, 40, 9223372036854775808, -63); + + // 1e20 + check_normalize(11368684, 43, 40, 12500000250510966784, 3); + + // max value + check_normalize(16777213, 104, 40, 18446740775174668288, 64); + + // F64 + + // min value + check_normalize(1, -1074, 63, 9223372036854775808, -1137); + + // 1.0e-250 + check_normalize(6448907850777164, -883, 11, 13207363278391631872, -894); + + // 1.0e-150 + check_normalize(7371020360979573, -551, 11, 15095849699286165504, -562); + + // 1.0e-45 + check_normalize(6427752177035961, -202, 11, 13164036458569648128, -213); + + // 1.0e-40 + check_normalize(4903985730770844, -185, 11, 10043362776618688512, -196); + + // 1.0e-20 + check_normalize(6646139978924579, -119, 11, 13611294676837537792, -130); + + // 1.0 + check_normalize(4503599627370496, -52, 11, 9223372036854775808, -63); + + // 1e20 + check_normalize(6103515625000000, 14, 11, 12500000000000000000, 3); + + // 1e40 + check_normalize(8271806125530277, 80, 11, 16940658945086007296, 69); + + // 1e150 + check_normalize(5503284107318959, 446, 11, 11270725851789228032, 435); + + // 1e250 + check_normalize(6290184345309700, 778, 11, 12882297539194265600, 767); + + // max value + check_normalize(9007199254740991, 971, 11, 18446744073709549568, 960); +} + +// ROUND + +fn check_round_to_f32(mant: u64, exp: i32, r_mant: u64, r_exp: i32) { + let mut x = ExtendedFloat { mant, exp }; + x.round_to_native::<f32, _>(round_nearest_tie_even); + assert_eq!( + x, + ExtendedFloat { + mant: r_mant, + exp: r_exp + } + ); +} + +#[test] +fn round_to_f32_test() { + // This is lossy, so some of these values are **slightly** rounded. + + // underflow + check_round_to_f32(9223372036854775808, -213, 0, -149); + + // min value + check_round_to_f32(9223372036854775808, -212, 1, -149); + + // 1.0e-40 + check_round_to_f32(10043308644012916736, -196, 71362, -149); + + // 1.0e-20 + check_round_to_f32(13611294244890214400, -130, 12379400, -90); + + // 1.0 + check_round_to_f32(9223372036854775808, -63, 8388608, -23); + + // 1e20 + check_round_to_f32(12500000250510966784, 3, 11368684, 43); + + // max value + check_round_to_f32(18446740775174668288, 64, 16777213, 104); + + // overflow + check_round_to_f32(18446740775174668288, 65, 16777213, 105); +} + +fn check_round_to_f64(mant: u64, exp: i32, r_mant: u64, r_exp: i32) { + let mut x = ExtendedFloat { mant, exp }; + x.round_to_native::<f64, _>(round_nearest_tie_even); + assert_eq!( + x, + ExtendedFloat { + mant: r_mant, + exp: r_exp + } + ); +} + +#[test] +fn round_to_f64_test() { + // This is lossy, so some of these values are **slightly** rounded. + + // underflow + check_round_to_f64(9223372036854775808, -1138, 0, -1074); + + // min value + check_round_to_f64(9223372036854775808, -1137, 1, -1074); + + // 1.0e-250 + check_round_to_f64(15095849699286165504, -562, 7371020360979573, -551); + + // 1.0e-150 + check_round_to_f64(15095849699286165504, -562, 7371020360979573, -551); + + // 1.0e-45 + check_round_to_f64(13164036458569648128, -213, 6427752177035961, -202); + + // 1.0e-40 + check_round_to_f64(10043362776618688512, -196, 4903985730770844, -185); + + // 1.0e-20 + check_round_to_f64(13611294676837537792, -130, 6646139978924579, -119); + + // 1.0 + check_round_to_f64(9223372036854775808, -63, 4503599627370496, -52); + + // 1e20 + check_round_to_f64(12500000000000000000, 3, 6103515625000000, 14); + + // 1e40 + check_round_to_f64(16940658945086007296, 69, 8271806125530277, 80); + + // 1e150 + check_round_to_f64(11270725851789228032, 435, 5503284107318959, 446); + + // 1e250 + check_round_to_f64(12882297539194265600, 767, 6290184345309700, 778); + + // max value + check_round_to_f64(18446744073709549568, 960, 9007199254740991, 971); + + // Bug fixes + // 1.2345e-308 + check_round_to_f64(10234494226754558294, -1086, 2498655817078750, -1074); +} + +fn assert_normalized_eq(mut x: ExtendedFloat, mut y: ExtendedFloat) { + x.normalize(); + y.normalize(); + assert_eq!(x, y); +} + +#[test] +fn from_float() { + let values: [f32; 26] = [ + 1e-40, 2e-40, 1e-35, 2e-35, 1e-30, 2e-30, 1e-25, 2e-25, 1e-20, 2e-20, 1e-15, 2e-15, 1e-10, + 2e-10, 1e-5, 2e-5, 1.0, 2.0, 1e5, 2e5, 1e10, 2e10, 1e15, 2e15, 1e20, 2e20, + ]; + for value in &values { + assert_normalized_eq( + ExtendedFloat::from_float(*value), + ExtendedFloat::from_float(*value as f64), + ); + } +} + +// TO + +// Sample of interesting numbers to check during standard test builds. +const INTEGERS: [u64; 32] = [ + 0, // 0x0 + 1, // 0x1 + 7, // 0x7 + 15, // 0xF + 112, // 0x70 + 119, // 0x77 + 127, // 0x7F + 240, // 0xF0 + 247, // 0xF7 + 255, // 0xFF + 2032, // 0x7F0 + 2039, // 0x7F7 + 2047, // 0x7FF + 4080, // 0xFF0 + 4087, // 0xFF7 + 4095, // 0xFFF + 65520, // 0xFFF0 + 65527, // 0xFFF7 + 65535, // 0xFFFF + 1048560, // 0xFFFF0 + 1048567, // 0xFFFF7 + 1048575, // 0xFFFFF + 16777200, // 0xFFFFF0 + 16777207, // 0xFFFFF7 + 16777215, // 0xFFFFFF + 268435440, // 0xFFFFFF0 + 268435447, // 0xFFFFFF7 + 268435455, // 0xFFFFFFF + 4294967280, // 0xFFFFFFF0 + 4294967287, // 0xFFFFFFF7 + 4294967295, // 0xFFFFFFFF + 18446744073709551615, // 0xFFFFFFFFFFFFFFFF +]; + +#[test] +fn to_f32_test() { + // underflow + let x = ExtendedFloat { + mant: 9223372036854775808, + exp: -213, + }; + assert_eq!(x.into_float::<f32>(), 0.0); + + // min value + let x = ExtendedFloat { + mant: 9223372036854775808, + exp: -212, + }; + assert_eq!(x.into_float::<f32>(), 1e-45); + + // 1.0e-40 + let x = ExtendedFloat { + mant: 10043308644012916736, + exp: -196, + }; + assert_eq!(x.into_float::<f32>(), 1e-40); + + // 1.0e-20 + let x = ExtendedFloat { + mant: 13611294244890214400, + exp: -130, + }; + assert_eq!(x.into_float::<f32>(), 1e-20); + + // 1.0 + let x = ExtendedFloat { + mant: 9223372036854775808, + exp: -63, + }; + assert_eq!(x.into_float::<f32>(), 1.0); + + // 1e20 + let x = ExtendedFloat { + mant: 12500000250510966784, + exp: 3, + }; + assert_eq!(x.into_float::<f32>(), 1e20); + + // max value + let x = ExtendedFloat { + mant: 18446740775174668288, + exp: 64, + }; + assert_eq!(x.into_float::<f32>(), 3.402823e38); + + // almost max, high exp + let x = ExtendedFloat { + mant: 1048575, + exp: 108, + }; + assert_eq!(x.into_float::<f32>(), 3.4028204e38); + + // max value + 1 + let x = ExtendedFloat { + mant: 16777216, + exp: 104, + }; + assert_eq!(x.into_float::<f32>(), f32::INFINITY); + + // max value + 1 + let x = ExtendedFloat { + mant: 1048576, + exp: 108, + }; + assert_eq!(x.into_float::<f32>(), f32::INFINITY); + + // 1e40 + let x = ExtendedFloat { + mant: 16940658945086007296, + exp: 69, + }; + assert_eq!(x.into_float::<f32>(), f32::INFINITY); + + // Integers. + for int in &INTEGERS { + let fp = ExtendedFloat { mant: *int, exp: 0 }; + assert_eq!(fp.into_float::<f32>(), *int as f32, "{:?} as f32", *int); + } +} + +#[test] +fn to_f64_test() { + // underflow + let x = ExtendedFloat { + mant: 9223372036854775808, + exp: -1138, + }; + assert_eq!(x.into_float::<f64>(), 0.0); + + // min value + let x = ExtendedFloat { + mant: 9223372036854775808, + exp: -1137, + }; + assert_eq!(x.into_float::<f64>(), 5e-324); + + // 1.0e-250 + let x = ExtendedFloat { + mant: 13207363278391631872, + exp: -894, + }; + assert_eq!(x.into_float::<f64>(), 1e-250); + + // 1.0e-150 + let x = ExtendedFloat { + mant: 15095849699286165504, + exp: -562, + }; + assert_eq!(x.into_float::<f64>(), 1e-150); + + // 1.0e-45 + let x = ExtendedFloat { + mant: 13164036458569648128, + exp: -213, + }; + assert_eq!(x.into_float::<f64>(), 1e-45); + + // 1.0e-40 + let x = ExtendedFloat { + mant: 10043362776618688512, + exp: -196, + }; + assert_eq!(x.into_float::<f64>(), 1e-40); + + // 1.0e-20 + let x = ExtendedFloat { + mant: 13611294676837537792, + exp: -130, + }; + assert_eq!(x.into_float::<f64>(), 1e-20); + + // 1.0 + let x = ExtendedFloat { + mant: 9223372036854775808, + exp: -63, + }; + assert_eq!(x.into_float::<f64>(), 1.0); + + // 1e20 + let x = ExtendedFloat { + mant: 12500000000000000000, + exp: 3, + }; + assert_eq!(x.into_float::<f64>(), 1e20); + + // 1e40 + let x = ExtendedFloat { + mant: 16940658945086007296, + exp: 69, + }; + assert_eq!(x.into_float::<f64>(), 1e40); + + // 1e150 + let x = ExtendedFloat { + mant: 11270725851789228032, + exp: 435, + }; + assert_eq!(x.into_float::<f64>(), 1e150); + + // 1e250 + let x = ExtendedFloat { + mant: 12882297539194265600, + exp: 767, + }; + assert_eq!(x.into_float::<f64>(), 1e250); + + // max value + let x = ExtendedFloat { + mant: 9007199254740991, + exp: 971, + }; + assert_eq!(x.into_float::<f64>(), 1.7976931348623157e308); + + // max value + let x = ExtendedFloat { + mant: 18446744073709549568, + exp: 960, + }; + assert_eq!(x.into_float::<f64>(), 1.7976931348623157e308); + + // overflow + let x = ExtendedFloat { + mant: 9007199254740992, + exp: 971, + }; + assert_eq!(x.into_float::<f64>(), f64::INFINITY); + + // overflow + let x = ExtendedFloat { + mant: 18446744073709549568, + exp: 961, + }; + assert_eq!(x.into_float::<f64>(), f64::INFINITY); + + // Underflow + // Adapted from failures in strtod. + let x = ExtendedFloat { + exp: -1139, + mant: 18446744073709550712, + }; + assert_eq!(x.into_float::<f64>(), 0.0); + + let x = ExtendedFloat { + exp: -1139, + mant: 18446744073709551460, + }; + assert_eq!(x.into_float::<f64>(), 0.0); + + let x = ExtendedFloat { + exp: -1138, + mant: 9223372036854776103, + }; + assert_eq!(x.into_float::<f64>(), 5e-324); + + // Integers. + for int in &INTEGERS { + let fp = ExtendedFloat { mant: *int, exp: 0 }; + assert_eq!(fp.into_float::<f64>(), *int as f64, "{:?} as f64", *int); + } +} + +// OPERATIONS + +fn check_mul(a: ExtendedFloat, b: ExtendedFloat, c: ExtendedFloat) { + let r = a.mul(&b); + assert_eq!(r, c); +} + +#[test] +fn mul_test() { + // Normalized (64-bit mantissa) + let a = ExtendedFloat { + mant: 13164036458569648128, + exp: -213, + }; + let b = ExtendedFloat { + mant: 9223372036854775808, + exp: -62, + }; + let c = ExtendedFloat { + mant: 6582018229284824064, + exp: -211, + }; + check_mul(a, b, c); + + // Check with integers + // 64-bit mantissa + let mut a = ExtendedFloat { mant: 10, exp: 0 }; + let mut b = ExtendedFloat { mant: 10, exp: 0 }; + a.normalize(); + b.normalize(); + assert_eq!(a.mul(&b).into_float::<f64>(), 100.0); + + // Check both values need high bits set. + let a = ExtendedFloat { + mant: 1 << 32, + exp: -31, + }; + let b = ExtendedFloat { + mant: 1 << 32, + exp: -31, + }; + assert_eq!(a.mul(&b).into_float::<f64>(), 4.0); + + // Check both values need high bits set. + let a = ExtendedFloat { + mant: 10 << 31, + exp: -31, + }; + let b = ExtendedFloat { + mant: 10 << 31, + exp: -31, + }; + assert_eq!(a.mul(&b).into_float::<f64>(), 100.0); +} + +fn check_imul(mut a: ExtendedFloat, b: ExtendedFloat, c: ExtendedFloat) { + a.imul(&b); + assert_eq!(a, c); +} + +#[test] +fn imul_test() { + // Normalized (64-bit mantissa) + let a = ExtendedFloat { + mant: 13164036458569648128, + exp: -213, + }; + let b = ExtendedFloat { + mant: 9223372036854775808, + exp: -62, + }; + let c = ExtendedFloat { + mant: 6582018229284824064, + exp: -211, + }; + check_imul(a, b, c); + + // Check with integers + // 64-bit mantissa + let mut a = ExtendedFloat { mant: 10, exp: 0 }; + let mut b = ExtendedFloat { mant: 10, exp: 0 }; + a.normalize(); + b.normalize(); + a.imul(&b); + assert_eq!(a.into_float::<f64>(), 100.0); + + // Check both values need high bits set. + let mut a = ExtendedFloat { + mant: 1 << 32, + exp: -31, + }; + let b = ExtendedFloat { + mant: 1 << 32, + exp: -31, + }; + a.imul(&b); + assert_eq!(a.into_float::<f64>(), 4.0); + + // Check both values need high bits set. + let mut a = ExtendedFloat { + mant: 10 << 31, + exp: -31, + }; + let b = ExtendedFloat { + mant: 10 << 31, + exp: -31, + }; + a.imul(&b); + assert_eq!(a.into_float::<f64>(), 100.0); +} diff --git a/vendor/serde_json/tests/lexical/math.rs b/vendor/serde_json/tests/lexical/math.rs new file mode 100644 index 000000000..79d3ef3ee --- /dev/null +++ b/vendor/serde_json/tests/lexical/math.rs @@ -0,0 +1,211 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::math::{Limb, Math}; +use std::cmp; + +#[derive(Clone, Default)] +struct Bigint { + data: Vec<Limb>, +} + +impl Math for Bigint { + fn data(&self) -> &Vec<Limb> { + &self.data + } + + fn data_mut(&mut self) -> &mut Vec<Limb> { + &mut self.data + } +} + +#[cfg(limb_width_32)] +pub(crate) fn from_u32(x: &[u32]) -> Vec<Limb> { + x.iter().cloned().collect() +} + +#[cfg(limb_width_64)] +pub(crate) fn from_u32(x: &[u32]) -> Vec<Limb> { + let mut v = Vec::<Limb>::default(); + for xi in x.chunks(2) { + match xi.len() { + 1 => v.push(xi[0] as u64), + 2 => v.push(((xi[1] as u64) << 32) | (xi[0] as u64)), + _ => unreachable!(), + } + } + + v +} + +#[test] +fn compare_test() { + // Simple + let x = Bigint { + data: from_u32(&[1]), + }; + let y = Bigint { + data: from_u32(&[2]), + }; + assert_eq!(x.compare(&y), cmp::Ordering::Less); + assert_eq!(x.compare(&x), cmp::Ordering::Equal); + assert_eq!(y.compare(&x), cmp::Ordering::Greater); + + // Check asymmetric + let x = Bigint { + data: from_u32(&[5, 1]), + }; + let y = Bigint { + data: from_u32(&[2]), + }; + assert_eq!(x.compare(&y), cmp::Ordering::Greater); + assert_eq!(x.compare(&x), cmp::Ordering::Equal); + assert_eq!(y.compare(&x), cmp::Ordering::Less); + + // Check when we use reverse ordering properly. + let x = Bigint { + data: from_u32(&[5, 1, 9]), + }; + let y = Bigint { + data: from_u32(&[6, 2, 8]), + }; + assert_eq!(x.compare(&y), cmp::Ordering::Greater); + assert_eq!(x.compare(&x), cmp::Ordering::Equal); + assert_eq!(y.compare(&x), cmp::Ordering::Less); + + // Complex scenario, check it properly uses reverse ordering. + let x = Bigint { + data: from_u32(&[0, 1, 9]), + }; + let y = Bigint { + data: from_u32(&[4294967295, 0, 9]), + }; + assert_eq!(x.compare(&y), cmp::Ordering::Greater); + assert_eq!(x.compare(&x), cmp::Ordering::Equal); + assert_eq!(y.compare(&x), cmp::Ordering::Less); +} + +#[test] +fn hi64_test() { + assert_eq!(Bigint::from_u64(0xA).hi64(), (0xA000000000000000, false)); + assert_eq!(Bigint::from_u64(0xAB).hi64(), (0xAB00000000000000, false)); + assert_eq!( + Bigint::from_u64(0xAB00000000).hi64(), + (0xAB00000000000000, false) + ); + assert_eq!( + Bigint::from_u64(0xA23456789A).hi64(), + (0xA23456789A000000, false) + ); +} + +#[test] +fn bit_length_test() { + let x = Bigint { + data: from_u32(&[0, 0, 0, 1]), + }; + assert_eq!(x.bit_length(), 97); + + let x = Bigint { + data: from_u32(&[0, 0, 0, 3]), + }; + assert_eq!(x.bit_length(), 98); + + let x = Bigint { + data: from_u32(&[1 << 31]), + }; + assert_eq!(x.bit_length(), 32); +} + +#[test] +fn iadd_small_test() { + // Overflow check (single) + // This should set all the internal data values to 0, the top + // value to (1<<31), and the bottom value to (4>>1). + // This is because the max_value + 1 leads to all 0s, we set the + // topmost bit to 1. + let mut x = Bigint { + data: from_u32(&[4294967295]), + }; + x.iadd_small(5); + assert_eq!(x.data, from_u32(&[4, 1])); + + // No overflow, single value + let mut x = Bigint { + data: from_u32(&[5]), + }; + x.iadd_small(7); + assert_eq!(x.data, from_u32(&[12])); + + // Single carry, internal overflow + let mut x = Bigint::from_u64(0x80000000FFFFFFFF); + x.iadd_small(7); + assert_eq!(x.data, from_u32(&[6, 0x80000001])); + + // Double carry, overflow + let mut x = Bigint::from_u64(0xFFFFFFFFFFFFFFFF); + x.iadd_small(7); + assert_eq!(x.data, from_u32(&[6, 0, 1])); +} + +#[test] +fn imul_small_test() { + // No overflow check, 1-int. + let mut x = Bigint { + data: from_u32(&[5]), + }; + x.imul_small(7); + assert_eq!(x.data, from_u32(&[35])); + + // No overflow check, 2-ints. + let mut x = Bigint::from_u64(0x4000000040000); + x.imul_small(5); + assert_eq!(x.data, from_u32(&[0x00140000, 0x140000])); + + // Overflow, 1 carry. + let mut x = Bigint { + data: from_u32(&[0x33333334]), + }; + x.imul_small(5); + assert_eq!(x.data, from_u32(&[4, 1])); + + // Overflow, 1 carry, internal. + let mut x = Bigint::from_u64(0x133333334); + x.imul_small(5); + assert_eq!(x.data, from_u32(&[4, 6])); + + // Overflow, 2 carries. + let mut x = Bigint::from_u64(0x3333333333333334); + x.imul_small(5); + assert_eq!(x.data, from_u32(&[4, 0, 1])); +} + +#[test] +fn shl_test() { + // Pattern generated via `''.join(["1" +"0"*i for i in range(20)])` + let mut big = Bigint { + data: from_u32(&[0xD2210408]), + }; + big.ishl(5); + assert_eq!(big.data, from_u32(&[0x44208100, 0x1A])); + big.ishl(32); + assert_eq!(big.data, from_u32(&[0, 0x44208100, 0x1A])); + big.ishl(27); + assert_eq!(big.data, from_u32(&[0, 0, 0xD2210408])); + + // 96-bits of previous pattern + let mut big = Bigint { + data: from_u32(&[0x20020010, 0x8040100, 0xD2210408]), + }; + big.ishl(5); + assert_eq!(big.data, from_u32(&[0x400200, 0x802004, 0x44208101, 0x1A])); + big.ishl(32); + assert_eq!( + big.data, + from_u32(&[0, 0x400200, 0x802004, 0x44208101, 0x1A]) + ); + big.ishl(27); + assert_eq!( + big.data, + from_u32(&[0, 0, 0x20020010, 0x8040100, 0xD2210408]) + ); +} diff --git a/vendor/serde_json/tests/lexical/num.rs b/vendor/serde_json/tests/lexical/num.rs new file mode 100644 index 000000000..1a94be013 --- /dev/null +++ b/vendor/serde_json/tests/lexical/num.rs @@ -0,0 +1,76 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::num::{AsPrimitive, Float, Integer, Number}; + +fn check_as_primitive<T: AsPrimitive>(t: T) { + let _: u32 = t.as_u32(); + let _: u64 = t.as_u64(); + let _: u128 = t.as_u128(); + let _: usize = t.as_usize(); + let _: f32 = t.as_f32(); + let _: f64 = t.as_f64(); +} + +#[test] +fn as_primitive_test() { + check_as_primitive(1u32); + check_as_primitive(1u64); + check_as_primitive(1u128); + check_as_primitive(1usize); + check_as_primitive(1f32); + check_as_primitive(1f64); +} + +fn check_number<T: Number>(x: T, y: T) { + // Copy, partialeq, partialord + let _ = x; + assert!(x < y); + assert!(x != y); + + // Operations + let _ = y + x; + + // Conversions already tested. +} + +#[test] +fn number_test() { + check_number(1u32, 5); + check_number(1u64, 5); + check_number(1u128, 5); + check_number(1usize, 5); + check_number(1f32, 5.0); + check_number(1f64, 5.0); +} + +fn check_integer<T: Integer>(x: T) { + // Bitwise operations + let _ = x & T::ZERO; +} + +#[test] +fn integer_test() { + check_integer(65u32); + check_integer(65u64); + check_integer(65u128); + check_integer(65usize); +} + +fn check_float<T: Float>(x: T) { + // Check functions + let _ = x.pow10(5); + let _ = x.to_bits(); + assert!(T::from_bits(x.to_bits()) == x); + + // Check properties + let _ = x.to_bits() & T::SIGN_MASK; + let _ = x.to_bits() & T::EXPONENT_MASK; + let _ = x.to_bits() & T::HIDDEN_BIT_MASK; + let _ = x.to_bits() & T::MANTISSA_MASK; +} + +#[test] +fn float_test() { + check_float(123f32); + check_float(123f64); +} diff --git a/vendor/serde_json/tests/lexical/parse.rs b/vendor/serde_json/tests/lexical/parse.rs new file mode 100644 index 000000000..80ca25e77 --- /dev/null +++ b/vendor/serde_json/tests/lexical/parse.rs @@ -0,0 +1,204 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::num::Float; +use crate::lexical::parse::{parse_concise_float, parse_truncated_float}; +use core::f64; +use core::fmt::Debug; + +fn check_concise_float<F>(mantissa: u64, exponent: i32, expected: F) +where + F: Float + Debug, +{ + assert_eq!(parse_concise_float::<F>(mantissa, exponent), expected); +} + +fn check_truncated_float<F>(integer: &str, fraction: &str, exponent: i32, expected: F) +where + F: Float + Debug, +{ + let integer = integer.as_bytes(); + let fraction = fraction.as_bytes(); + assert_eq!( + parse_truncated_float::<F>(integer, fraction, exponent), + expected, + ); +} + +#[test] +fn parse_f32_test() { + check_concise_float(0, 0, 0.0_f32); + check_concise_float(12345, -4, 1.2345_f32); + check_concise_float(12345, -3, 12.345_f32); + check_concise_float(123456789, -4, 12345.6789_f32); + check_concise_float(12345, 6, 1.2345e10_f32); + check_concise_float(12345, -42, 1.2345e-38_f32); + + // Check expected rounding, using borderline cases. + // Round-down, halfway + check_concise_float(16777216, 0, 16777216.0_f32); + check_concise_float(16777217, 0, 16777216.0_f32); + check_concise_float(16777218, 0, 16777218.0_f32); + check_concise_float(33554432, 0, 33554432.0_f32); + check_concise_float(33554434, 0, 33554432.0_f32); + check_concise_float(33554436, 0, 33554436.0_f32); + check_concise_float(17179869184, 0, 17179869184.0_f32); + check_concise_float(17179870208, 0, 17179869184.0_f32); + check_concise_float(17179871232, 0, 17179871232.0_f32); + + // Round-up, halfway + check_concise_float(16777218, 0, 16777218.0_f32); + check_concise_float(16777219, 0, 16777220.0_f32); + check_concise_float(16777220, 0, 16777220.0_f32); + + check_concise_float(33554436, 0, 33554436.0_f32); + check_concise_float(33554438, 0, 33554440.0_f32); + check_concise_float(33554440, 0, 33554440.0_f32); + + check_concise_float(17179871232, 0, 17179871232.0_f32); + check_concise_float(17179872256, 0, 17179873280.0_f32); + check_concise_float(17179873280, 0, 17179873280.0_f32); + + // Round-up, above halfway + check_concise_float(33554435, 0, 33554436.0_f32); + check_concise_float(17179870209, 0, 17179871232.0_f32); + + // Check exactly halfway, round-up at halfway + check_truncated_float("1", "00000017881393432617187499", 0, 1.0000001_f32); + check_truncated_float("1", "000000178813934326171875", 0, 1.0000002_f32); + check_truncated_float("1", "00000017881393432617187501", 0, 1.0000002_f32); +} + +#[test] +fn parse_f64_test() { + check_concise_float(0, 0, 0.0_f64); + check_concise_float(12345, -4, 1.2345_f64); + check_concise_float(12345, -3, 12.345_f64); + check_concise_float(123456789, -4, 12345.6789_f64); + check_concise_float(12345, 6, 1.2345e10_f64); + check_concise_float(12345, -312, 1.2345e-308_f64); + + // Check expected rounding, using borderline cases. + // Round-down, halfway + check_concise_float(9007199254740992, 0, 9007199254740992.0_f64); + check_concise_float(9007199254740993, 0, 9007199254740992.0_f64); + check_concise_float(9007199254740994, 0, 9007199254740994.0_f64); + + check_concise_float(18014398509481984, 0, 18014398509481984.0_f64); + check_concise_float(18014398509481986, 0, 18014398509481984.0_f64); + check_concise_float(18014398509481988, 0, 18014398509481988.0_f64); + + check_concise_float(9223372036854775808, 0, 9223372036854775808.0_f64); + check_concise_float(9223372036854776832, 0, 9223372036854775808.0_f64); + check_concise_float(9223372036854777856, 0, 9223372036854777856.0_f64); + + check_truncated_float( + "11417981541647679048466287755595961091061972992", + "", + 0, + 11417981541647679048466287755595961091061972992.0_f64, + ); + check_truncated_float( + "11417981541647680316116887983825362587765178368", + "", + 0, + 11417981541647679048466287755595961091061972992.0_f64, + ); + check_truncated_float( + "11417981541647681583767488212054764084468383744", + "", + 0, + 11417981541647681583767488212054764084468383744.0_f64, + ); + + // Round-up, halfway + check_concise_float(9007199254740994, 0, 9007199254740994.0_f64); + check_concise_float(9007199254740995, 0, 9007199254740996.0_f64); + check_concise_float(9007199254740996, 0, 9007199254740996.0_f64); + + check_concise_float(18014398509481988, 0, 18014398509481988.0_f64); + check_concise_float(18014398509481990, 0, 18014398509481992.0_f64); + check_concise_float(18014398509481992, 0, 18014398509481992.0_f64); + + check_concise_float(9223372036854777856, 0, 9223372036854777856.0_f64); + check_concise_float(9223372036854778880, 0, 9223372036854779904.0_f64); + check_concise_float(9223372036854779904, 0, 9223372036854779904.0_f64); + + check_truncated_float( + "11417981541647681583767488212054764084468383744", + "", + 0, + 11417981541647681583767488212054764084468383744.0_f64, + ); + check_truncated_float( + "11417981541647682851418088440284165581171589120", + "", + 0, + 11417981541647684119068688668513567077874794496.0_f64, + ); + check_truncated_float( + "11417981541647684119068688668513567077874794496", + "", + 0, + 11417981541647684119068688668513567077874794496.0_f64, + ); + + // Round-up, above halfway + check_concise_float(9223372036854776833, 0, 9223372036854777856.0_f64); + check_truncated_float( + "11417981541647680316116887983825362587765178369", + "", + 0, + 11417981541647681583767488212054764084468383744.0_f64, + ); + + // Rounding error + // Adapted from failures in strtod. + check_concise_float(22250738585072014, -324, 2.2250738585072014e-308_f64); + check_truncated_float("2", "2250738585072011360574097967091319759348195463516456480234261097248222220210769455165295239081350879141491589130396211068700864386945946455276572074078206217433799881410632673292535522868813721490129811224514518898490572223072852551331557550159143974763979834118019993239625482890171070818506906306666559949382757725720157630626906633326475653000092458883164330377797918696120494973903778297049050510806099407302629371289589500035837999672072543043602840788957717961509455167482434710307026091446215722898802581825451803257070188608721131280795122334262883686223215037756666225039825343359745688844239002654981983854879482922068947216898310996983658468140228542433306603398508864458040010349339704275671864433837704860378616227717385456230658746790140867233276367187499", -308, 2.225073858507201e-308_f64); + check_truncated_float("2", "22507385850720113605740979670913197593481954635164564802342610972482222202107694551652952390813508791414915891303962110687008643869459464552765720740782062174337998814106326732925355228688137214901298112245145188984905722230728525513315575501591439747639798341180199932396254828901710708185069063066665599493827577257201576306269066333264756530000924588831643303777979186961204949739037782970490505108060994073026293712895895000358379996720725430436028407889577179615094551674824347103070260914462157228988025818254518032570701886087211312807951223342628836862232150377566662250398253433597456888442390026549819838548794829220689472168983109969836584681402285424333066033985088644580400103493397042756718644338377048603786162277173854562306587467901408672332763671875", -308, 2.2250738585072014e-308_f64); + check_truncated_float("2", "2250738585072011360574097967091319759348195463516456480234261097248222220210769455165295239081350879141491589130396211068700864386945946455276572074078206217433799881410632673292535522868813721490129811224514518898490572223072852551331557550159143974763979834118019993239625482890171070818506906306666559949382757725720157630626906633326475653000092458883164330377797918696120494973903778297049050510806099407302629371289589500035837999672072543043602840788957717961509455167482434710307026091446215722898802581825451803257070188608721131280795122334262883686223215037756666225039825343359745688844239002654981983854879482922068947216898310996983658468140228542433306603398508864458040010349339704275671864433837704860378616227717385456230658746790140867233276367187501", -308, 2.2250738585072014e-308_f64); + check_truncated_float("179769313486231580793728971405303415079934132710037826936173778980444968292764750946649017977587207096330286416692887910946555547851940402630657488671505820681908902000708383676273854845817711531764475730270069855571366959622842914819860834936475292719074168444365510704342711559699508093042880177904174497791", "9999999999999999999999999999999999999999999999999999999999999999999999", 0, 1.7976931348623157e+308_f64); + check_truncated_float("7", "4109846876186981626485318930233205854758970392148714663837852375101326090531312779794975454245398856969484704316857659638998506553390969459816219401617281718945106978546710679176872575177347315553307795408549809608457500958111373034747658096871009590975442271004757307809711118935784838675653998783503015228055934046593739791790738723868299395818481660169122019456499931289798411362062484498678713572180352209017023903285791732520220528974020802906854021606612375549983402671300035812486479041385743401875520901590172592547146296175134159774938718574737870961645638908718119841271673056017045493004705269590165763776884908267986972573366521765567941072508764337560846003984904972149117463085539556354188641513168478436313080237596295773983001708984374999", -324, 5.0e-324_f64); + check_truncated_float("7", "4109846876186981626485318930233205854758970392148714663837852375101326090531312779794975454245398856969484704316857659638998506553390969459816219401617281718945106978546710679176872575177347315553307795408549809608457500958111373034747658096871009590975442271004757307809711118935784838675653998783503015228055934046593739791790738723868299395818481660169122019456499931289798411362062484498678713572180352209017023903285791732520220528974020802906854021606612375549983402671300035812486479041385743401875520901590172592547146296175134159774938718574737870961645638908718119841271673056017045493004705269590165763776884908267986972573366521765567941072508764337560846003984904972149117463085539556354188641513168478436313080237596295773983001708984375", -324, 1.0e-323_f64); + check_truncated_float("7", "4109846876186981626485318930233205854758970392148714663837852375101326090531312779794975454245398856969484704316857659638998506553390969459816219401617281718945106978546710679176872575177347315553307795408549809608457500958111373034747658096871009590975442271004757307809711118935784838675653998783503015228055934046593739791790738723868299395818481660169122019456499931289798411362062484498678713572180352209017023903285791732520220528974020802906854021606612375549983402671300035812486479041385743401875520901590172592547146296175134159774938718574737870961645638908718119841271673056017045493004705269590165763776884908267986972573366521765567941072508764337560846003984904972149117463085539556354188641513168478436313080237596295773983001708984375001", -324, 1.0e-323_f64); + check_truncated_float("", "0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000024703282292062327208828439643411068618252990130716238221279284125033775363510437593264991818081799618989828234772285886546332835517796989819938739800539093906315035659515570226392290858392449105184435931802849936536152500319370457678249219365623669863658480757001585769269903706311928279558551332927834338409351978015531246597263579574622766465272827220056374006485499977096599470454020828166226237857393450736339007967761930577506740176324673600968951340535537458516661134223766678604162159680461914467291840300530057530849048765391711386591646239524912623653881879636239373280423891018672348497668235089863388587925628302755995657524455507255189313690836254779186948667994968324049705821028513185451396213837722826145437693412532098591327667236328125", 0, 0.0_f64); + + // Rounding error + // Adapted from: + // https://www.exploringbinary.com/how-glibc-strtod-works/ + check_truncated_float("", "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000022250738585072008890245868760858598876504231122409594654935248025624400092282356951787758888037591552642309780950434312085877387158357291821993020294379224223559819827501242041788969571311791082261043971979604000454897391938079198936081525613113376149842043271751033627391549782731594143828136275113838604094249464942286316695429105080201815926642134996606517803095075913058719846423906068637102005108723282784678843631944515866135041223479014792369585208321597621066375401613736583044193603714778355306682834535634005074073040135602968046375918583163124224521599262546494300836851861719422417646455137135420132217031370496583210154654068035397417906022589503023501937519773030945763173210852507299305089761582519159720757232455434770912461317493580281734466552734375", 0, 2.2250738585072011e-308_f64); + + // Rounding error + // Adapted from test-parse-random failures. + check_concise_float(1009, -31, 1.009e-28_f64); + check_concise_float(18294, 304, f64::INFINITY); + + // Rounding error + // Adapted from a @dangrabcad's issue #20. + check_concise_float(7689539722041643, 149, 7.689539722041643e164_f64); + check_truncated_float("768953972204164300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "", 0, 7.689539722041643e164_f64); + check_truncated_float("768953972204164300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "0", 0, 7.689539722041643e164_f64); + + // Check other cases similar to @dangrabcad's issue #20. + check_truncated_float("9223372036854776833", "0", 0, 9223372036854777856.0_f64); + check_truncated_float( + "11417981541647680316116887983825362587765178369", + "0", + 0, + 11417981541647681583767488212054764084468383744.0_f64, + ); + check_concise_float(90071992547409950, -1, 9007199254740996.0_f64); + check_concise_float(180143985094819900, -1, 18014398509481992.0_f64); + check_truncated_float("9223372036854778880", "0", 0, 9223372036854779904.0_f64); + check_truncated_float( + "11417981541647682851418088440284165581171589120", + "0", + 0, + 11417981541647684119068688668513567077874794496.0_f64, + ); + + // Check other cases ostensibly identified via proptest. + check_truncated_float("71610528364411830000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "0", 0, 71610528364411830000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0_f64); + check_truncated_float("126769393745745060000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "0", 0, 126769393745745060000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0_f64); + check_truncated_float("38652960461239320000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "0", 0, 38652960461239320000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0_f64); +} diff --git a/vendor/serde_json/tests/lexical/rounding.rs b/vendor/serde_json/tests/lexical/rounding.rs new file mode 100644 index 000000000..7ea17716c --- /dev/null +++ b/vendor/serde_json/tests/lexical/rounding.rs @@ -0,0 +1,316 @@ +// Adapted from https://github.com/Alexhuszagh/rust-lexical. + +use crate::lexical::float::ExtendedFloat; +use crate::lexical::num::Float; +use crate::lexical::rounding::*; + +// MASKS + +#[test] +fn lower_n_mask_test() { + assert_eq!(lower_n_mask(0u64), 0b0); + assert_eq!(lower_n_mask(1u64), 0b1); + assert_eq!(lower_n_mask(2u64), 0b11); + assert_eq!(lower_n_mask(10u64), 0b1111111111); + assert_eq!(lower_n_mask(32u64), 0b11111111111111111111111111111111); +} + +#[test] +fn lower_n_halfway_test() { + assert_eq!(lower_n_halfway(0u64), 0b0); + assert_eq!(lower_n_halfway(1u64), 0b1); + assert_eq!(lower_n_halfway(2u64), 0b10); + assert_eq!(lower_n_halfway(10u64), 0b1000000000); + assert_eq!(lower_n_halfway(32u64), 0b10000000000000000000000000000000); +} + +#[test] +fn nth_bit_test() { + assert_eq!(nth_bit(0u64), 0b1); + assert_eq!(nth_bit(1u64), 0b10); + assert_eq!(nth_bit(2u64), 0b100); + assert_eq!(nth_bit(10u64), 0b10000000000); + assert_eq!(nth_bit(31u64), 0b10000000000000000000000000000000); +} + +#[test] +fn internal_n_mask_test() { + assert_eq!(internal_n_mask(1u64, 0u64), 0b0); + assert_eq!(internal_n_mask(1u64, 1u64), 0b1); + assert_eq!(internal_n_mask(2u64, 1u64), 0b10); + assert_eq!(internal_n_mask(4u64, 2u64), 0b1100); + assert_eq!(internal_n_mask(10u64, 2u64), 0b1100000000); + assert_eq!(internal_n_mask(10u64, 4u64), 0b1111000000); + assert_eq!( + internal_n_mask(32u64, 4u64), + 0b11110000000000000000000000000000 + ); +} + +// NEAREST ROUNDING + +#[test] +fn round_nearest_test() { + // Check exactly halfway (b'1100000') + let mut fp = ExtendedFloat { mant: 0x60, exp: 0 }; + let (above, halfway) = round_nearest(&mut fp, 6); + assert!(!above); + assert!(halfway); + assert_eq!(fp.mant, 1); + + // Check above halfway (b'1100001') + let mut fp = ExtendedFloat { mant: 0x61, exp: 0 }; + let (above, halfway) = round_nearest(&mut fp, 6); + assert!(above); + assert!(!halfway); + assert_eq!(fp.mant, 1); + + // Check below halfway (b'1011111') + let mut fp = ExtendedFloat { mant: 0x5F, exp: 0 }; + let (above, halfway) = round_nearest(&mut fp, 6); + assert!(!above); + assert!(!halfway); + assert_eq!(fp.mant, 1); +} + +// DIRECTED ROUNDING + +#[test] +fn round_downward_test() { + // b0000000 + let mut fp = ExtendedFloat { mant: 0x00, exp: 0 }; + round_downward(&mut fp, 6); + assert_eq!(fp.mant, 0); + + // b1000000 + let mut fp = ExtendedFloat { mant: 0x40, exp: 0 }; + round_downward(&mut fp, 6); + assert_eq!(fp.mant, 1); + + // b1100000 + let mut fp = ExtendedFloat { mant: 0x60, exp: 0 }; + round_downward(&mut fp, 6); + assert_eq!(fp.mant, 1); + + // b1110000 + let mut fp = ExtendedFloat { mant: 0x70, exp: 0 }; + round_downward(&mut fp, 6); + assert_eq!(fp.mant, 1); +} + +#[test] +fn round_nearest_tie_even_test() { + // Check round-up, halfway + let mut fp = ExtendedFloat { mant: 0x60, exp: 0 }; + round_nearest_tie_even(&mut fp, 6); + assert_eq!(fp.mant, 2); + + // Check round-down, halfway + let mut fp = ExtendedFloat { mant: 0x20, exp: 0 }; + round_nearest_tie_even(&mut fp, 6); + assert_eq!(fp.mant, 0); + + // Check round-up, above halfway + let mut fp = ExtendedFloat { mant: 0x61, exp: 0 }; + round_nearest_tie_even(&mut fp, 6); + assert_eq!(fp.mant, 2); + + let mut fp = ExtendedFloat { mant: 0x21, exp: 0 }; + round_nearest_tie_even(&mut fp, 6); + assert_eq!(fp.mant, 1); + + // Check round-down, below halfway + let mut fp = ExtendedFloat { mant: 0x5F, exp: 0 }; + round_nearest_tie_even(&mut fp, 6); + assert_eq!(fp.mant, 1); + + let mut fp = ExtendedFloat { mant: 0x1F, exp: 0 }; + round_nearest_tie_even(&mut fp, 6); + assert_eq!(fp.mant, 0); +} + +// HIGH-LEVEL + +#[test] +fn round_to_float_test() { + // Denormal + let mut fp = ExtendedFloat { + mant: 1 << 63, + exp: f64::DENORMAL_EXPONENT - 15, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1 << 48); + assert_eq!(fp.exp, f64::DENORMAL_EXPONENT); + + // Halfway, round-down (b'1000000000000000000000000000000000000000000000000000010000000000') + let mut fp = ExtendedFloat { + mant: 0x8000000000000400, + exp: -63, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1 << 52); + assert_eq!(fp.exp, -52); + + // Halfway, round-up (b'1000000000000000000000000000000000000000000000000000110000000000') + let mut fp = ExtendedFloat { + mant: 0x8000000000000C00, + exp: -63, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 2); + assert_eq!(fp.exp, -52); + + // Above halfway + let mut fp = ExtendedFloat { + mant: 0x8000000000000401, + exp: -63, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 1); + assert_eq!(fp.exp, -52); + + let mut fp = ExtendedFloat { + mant: 0x8000000000000C01, + exp: -63, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 2); + assert_eq!(fp.exp, -52); + + // Below halfway + let mut fp = ExtendedFloat { + mant: 0x80000000000003FF, + exp: -63, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1 << 52); + assert_eq!(fp.exp, -52); + + let mut fp = ExtendedFloat { + mant: 0x8000000000000BFF, + exp: -63, + }; + round_to_float::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 1); + assert_eq!(fp.exp, -52); +} + +#[test] +fn avoid_overflow_test() { + // Avoid overflow, fails by 1 + let mut fp = ExtendedFloat { + mant: 0xFFFFFFFFFFFF, + exp: f64::MAX_EXPONENT + 5, + }; + avoid_overflow::<f64>(&mut fp); + assert_eq!(fp.mant, 0xFFFFFFFFFFFF); + assert_eq!(fp.exp, f64::MAX_EXPONENT + 5); + + // Avoid overflow, succeeds + let mut fp = ExtendedFloat { + mant: 0xFFFFFFFFFFFF, + exp: f64::MAX_EXPONENT + 4, + }; + avoid_overflow::<f64>(&mut fp); + assert_eq!(fp.mant, 0x1FFFFFFFFFFFE0); + assert_eq!(fp.exp, f64::MAX_EXPONENT - 1); +} + +#[test] +fn round_to_native_test() { + // Overflow + let mut fp = ExtendedFloat { + mant: 0xFFFFFFFFFFFF, + exp: f64::MAX_EXPONENT + 4, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 0x1FFFFFFFFFFFE0); + assert_eq!(fp.exp, f64::MAX_EXPONENT - 1); + + // Need denormal + let mut fp = ExtendedFloat { + mant: 1, + exp: f64::DENORMAL_EXPONENT + 48, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1 << 48); + assert_eq!(fp.exp, f64::DENORMAL_EXPONENT); + + // Halfway, round-down (b'10000000000000000000000000000000000000000000000000000100000') + let mut fp = ExtendedFloat { + mant: 0x400000000000020, + exp: -58, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1 << 52); + assert_eq!(fp.exp, -52); + + // Halfway, round-up (b'10000000000000000000000000000000000000000000000000001100000') + let mut fp = ExtendedFloat { + mant: 0x400000000000060, + exp: -58, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 2); + assert_eq!(fp.exp, -52); + + // Above halfway + let mut fp = ExtendedFloat { + mant: 0x400000000000021, + exp: -58, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 1); + assert_eq!(fp.exp, -52); + + let mut fp = ExtendedFloat { + mant: 0x400000000000061, + exp: -58, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 2); + assert_eq!(fp.exp, -52); + + // Below halfway + let mut fp = ExtendedFloat { + mant: 0x40000000000001F, + exp: -58, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1 << 52); + assert_eq!(fp.exp, -52); + + let mut fp = ExtendedFloat { + mant: 0x40000000000005F, + exp: -58, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, (1 << 52) + 1); + assert_eq!(fp.exp, -52); + + // Underflow + // Adapted from failures in strtod. + let mut fp = ExtendedFloat { + exp: -1139, + mant: 18446744073709550712, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 0); + assert_eq!(fp.exp, 0); + + let mut fp = ExtendedFloat { + exp: -1139, + mant: 18446744073709551460, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 0); + assert_eq!(fp.exp, 0); + + let mut fp = ExtendedFloat { + exp: -1138, + mant: 9223372036854776103, + }; + round_to_native::<f64, _>(&mut fp, round_nearest_tie_even); + assert_eq!(fp.mant, 1); + assert_eq!(fp.exp, -1074); +} diff --git a/vendor/serde_json/tests/macros/mod.rs b/vendor/serde_json/tests/macros/mod.rs new file mode 100644 index 000000000..aaf820f07 --- /dev/null +++ b/vendor/serde_json/tests/macros/mod.rs @@ -0,0 +1,61 @@ +#![allow(unused_macro_rules)] + +macro_rules! json_str { + ([]) => { + "[]" + }; + ([ $e0:tt $(, $e:tt)* $(,)? ]) => { + concat!("[", + json_str!($e0), + $(",", json_str!($e),)* + "]") + }; + ({}) => { + "{}" + }; + ({ $k0:tt : $v0:tt $(, $k:tt : $v:tt)* $(,)? }) => { + concat!("{", + stringify!($k0), ":", json_str!($v0), + $(",", stringify!($k), ":", json_str!($v),)* + "}") + }; + (($other:tt)) => { + $other + }; + ($other:tt) => { + stringify!($other) + }; +} + +macro_rules! pretty_str { + ($json:tt) => { + pretty_str_impl!("", $json) + }; +} + +macro_rules! pretty_str_impl { + ($indent:expr, []) => { + "[]" + }; + ($indent:expr, [ $e0:tt $(, $e:tt)* $(,)? ]) => { + concat!("[\n ", + $indent, pretty_str_impl!(concat!(" ", $indent), $e0), + $(",\n ", $indent, pretty_str_impl!(concat!(" ", $indent), $e),)* + "\n", $indent, "]") + }; + ($indent:expr, {}) => { + "{}" + }; + ($indent:expr, { $k0:tt : $v0:tt $(, $k:tt : $v:tt)* $(,)? }) => { + concat!("{\n ", + $indent, stringify!($k0), ": ", pretty_str_impl!(concat!(" ", $indent), $v0), + $(",\n ", $indent, stringify!($k), ": ", pretty_str_impl!(concat!(" ", $indent), $v),)* + "\n", $indent, "}") + }; + ($indent:expr, ($other:tt)) => { + $other + }; + ($indent:expr, $other:tt) => { + stringify!($other) + }; +} diff --git a/vendor/serde_json/tests/map.rs b/vendor/serde_json/tests/map.rs new file mode 100644 index 000000000..ae0196956 --- /dev/null +++ b/vendor/serde_json/tests/map.rs @@ -0,0 +1,47 @@ +use serde_json::{from_str, Map, Value}; + +#[test] +fn test_preserve_order() { + // Sorted order + #[cfg(not(feature = "preserve_order"))] + const EXPECTED: &[&str] = &["a", "b", "c"]; + + // Insertion order + #[cfg(feature = "preserve_order")] + const EXPECTED: &[&str] = &["b", "a", "c"]; + + let v: Value = from_str(r#"{"b":null,"a":null,"c":null}"#).unwrap(); + let keys: Vec<_> = v.as_object().unwrap().keys().collect(); + assert_eq!(keys, EXPECTED); +} + +#[test] +fn test_append() { + // Sorted order + #[cfg(not(feature = "preserve_order"))] + const EXPECTED: &[&str] = &["a", "b", "c"]; + + // Insertion order + #[cfg(feature = "preserve_order")] + const EXPECTED: &[&str] = &["b", "a", "c"]; + + let mut v: Value = from_str(r#"{"b":null,"a":null,"c":null}"#).unwrap(); + let val = v.as_object_mut().unwrap(); + let mut m = Map::new(); + m.append(val); + let keys: Vec<_> = m.keys().collect(); + + assert_eq!(keys, EXPECTED); + assert!(val.is_empty()); +} + +#[cfg(not(no_btreemap_retain))] +#[test] +fn test_retain() { + let mut v: Value = from_str(r#"{"b":null,"a":null,"c":null}"#).unwrap(); + let val = v.as_object_mut().unwrap(); + val.retain(|k, _| k.as_str() != "b"); + + let keys: Vec<_> = val.keys().collect(); + assert_eq!(keys, &["a", "c"]); +} diff --git a/vendor/serde_json/tests/regression.rs b/vendor/serde_json/tests/regression.rs new file mode 100644 index 000000000..fb2b25c89 --- /dev/null +++ b/vendor/serde_json/tests/regression.rs @@ -0,0 +1,3 @@ +mod regression { + automod::dir!("tests/regression"); +} diff --git a/vendor/serde_json/tests/regression/issue520.rs b/vendor/serde_json/tests/regression/issue520.rs new file mode 100644 index 000000000..9ed367731 --- /dev/null +++ b/vendor/serde_json/tests/regression/issue520.rs @@ -0,0 +1,20 @@ +#![allow(clippy::float_cmp)] + +use serde_derive::{Serialize, Deserialize}; + +#[derive(Serialize, Deserialize, Debug)] +#[serde(tag = "type", content = "data")] +enum E { + Float(f32), +} + +#[test] +fn test() { + let e = E::Float(159.1); + let v = serde_json::to_value(e).unwrap(); + let e = serde_json::from_value::<E>(v).unwrap(); + + match e { + E::Float(f) => assert_eq!(f, 159.1), + } +} diff --git a/vendor/serde_json/tests/regression/issue795.rs b/vendor/serde_json/tests/regression/issue795.rs new file mode 100644 index 000000000..06b68724e --- /dev/null +++ b/vendor/serde_json/tests/regression/issue795.rs @@ -0,0 +1,57 @@ +use serde::de::{ + Deserialize, Deserializer, EnumAccess, IgnoredAny, MapAccess, VariantAccess, Visitor, +}; +use serde_json::json; +use std::fmt; + +#[derive(Debug)] +pub enum Enum { + Variant { x: u8 }, +} + +impl<'de> Deserialize<'de> for Enum { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: Deserializer<'de>, + { + struct EnumVisitor; + + impl<'de> Visitor<'de> for EnumVisitor { + type Value = Enum; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("enum Enum") + } + + fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> + where + A: EnumAccess<'de>, + { + let (IgnoredAny, variant) = data.variant()?; + variant.struct_variant(&["x"], self) + } + + fn visit_map<A>(self, mut data: A) -> Result<Self::Value, A::Error> + where + A: MapAccess<'de>, + { + let mut x = 0; + if let Some((IgnoredAny, value)) = data.next_entry()? { + x = value; + } + Ok(Enum::Variant { x }) + } + } + + deserializer.deserialize_enum("Enum", &["Variant"], EnumVisitor) + } +} + +#[test] +fn test() { + let s = r#" {"Variant":{"x":0,"y":0}} "#; + assert!(serde_json::from_str::<Enum>(s).is_err()); + + let j = json!({"Variant":{"x":0,"y":0}}); + assert!(serde_json::from_value::<Enum>(j).is_err()); +} diff --git a/vendor/serde_json/tests/regression/issue845.rs b/vendor/serde_json/tests/regression/issue845.rs new file mode 100644 index 000000000..56037ae66 --- /dev/null +++ b/vendor/serde_json/tests/regression/issue845.rs @@ -0,0 +1,74 @@ +#![allow(clippy::trait_duplication_in_bounds)] // https://github.com/rust-lang/rust-clippy/issues/8757 + +use serde::{Deserialize, Deserializer}; +use std::convert::TryFrom; +use std::fmt::{self, Display}; +use std::marker::PhantomData; +use std::str::FromStr; + +pub struct NumberVisitor<T> { + marker: PhantomData<T>, +} + +impl<'de, T> serde::de::Visitor<'de> for NumberVisitor<T> +where + T: TryFrom<u64> + TryFrom<i64> + FromStr, + <T as TryFrom<u64>>::Error: Display, + <T as TryFrom<i64>>::Error: Display, + <T as FromStr>::Err: Display, +{ + type Value = T; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("an integer or string") + } + + fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E> + where + E: serde::de::Error, + { + T::try_from(v).map_err(serde::de::Error::custom) + } + + fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E> + where + E: serde::de::Error, + { + T::try_from(v).map_err(serde::de::Error::custom) + } + + fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> + where + E: serde::de::Error, + { + v.parse().map_err(serde::de::Error::custom) + } +} + +fn deserialize_integer_or_string<'de, D, T>(deserializer: D) -> Result<T, D::Error> +where + D: Deserializer<'de>, + T: TryFrom<u64> + TryFrom<i64> + FromStr, + <T as TryFrom<u64>>::Error: Display, + <T as TryFrom<i64>>::Error: Display, + <T as FromStr>::Err: Display, +{ + deserializer.deserialize_any(NumberVisitor { + marker: PhantomData, + }) +} + +#[derive(Deserialize, Debug)] +pub struct Struct { + #[serde(deserialize_with = "deserialize_integer_or_string")] + pub i: i64, +} + +#[test] +fn test() { + let j = r#" {"i":100} "#; + println!("{:?}", serde_json::from_str::<Struct>(j).unwrap()); + + let j = r#" {"i":"100"} "#; + println!("{:?}", serde_json::from_str::<Struct>(j).unwrap()); +} diff --git a/vendor/serde_json/tests/stream.rs b/vendor/serde_json/tests/stream.rs new file mode 100644 index 000000000..ca54e9a15 --- /dev/null +++ b/vendor/serde_json/tests/stream.rs @@ -0,0 +1,182 @@ +#![cfg(not(feature = "preserve_order"))] + +use serde_json::{json, Deserializer, Value}; + +// Rustfmt issue https://github.com/rust-lang-nursery/rustfmt/issues/2740 +#[rustfmt::skip] +macro_rules! test_stream { + ($data:expr, $ty:ty, |$stream:ident| $test:block) => { + { + let de = Deserializer::from_str($data); + let mut $stream = de.into_iter::<$ty>(); + assert_eq!($stream.byte_offset(), 0); + $test + } + { + let de = Deserializer::from_slice($data.as_bytes()); + let mut $stream = de.into_iter::<$ty>(); + assert_eq!($stream.byte_offset(), 0); + $test + } + { + let mut bytes = $data.as_bytes(); + let de = Deserializer::from_reader(&mut bytes); + let mut $stream = de.into_iter::<$ty>(); + assert_eq!($stream.byte_offset(), 0); + $test + } + }; +} + +#[test] +fn test_json_stream_newlines() { + let data = "{\"x\":39} {\"x\":40}{\"x\":41}\n{\"x\":42}"; + + test_stream!(data, Value, |stream| { + assert_eq!(stream.next().unwrap().unwrap()["x"], 39); + assert_eq!(stream.byte_offset(), 8); + + assert_eq!(stream.next().unwrap().unwrap()["x"], 40); + assert_eq!(stream.byte_offset(), 17); + + assert_eq!(stream.next().unwrap().unwrap()["x"], 41); + assert_eq!(stream.byte_offset(), 25); + + assert_eq!(stream.next().unwrap().unwrap()["x"], 42); + assert_eq!(stream.byte_offset(), 34); + + assert!(stream.next().is_none()); + assert_eq!(stream.byte_offset(), 34); + }); +} + +#[test] +fn test_json_stream_trailing_whitespaces() { + let data = "{\"x\":42} \t\n"; + + test_stream!(data, Value, |stream| { + assert_eq!(stream.next().unwrap().unwrap()["x"], 42); + assert_eq!(stream.byte_offset(), 8); + + assert!(stream.next().is_none()); + assert_eq!(stream.byte_offset(), 11); + }); +} + +#[test] +fn test_json_stream_truncated() { + let data = "{\"x\":40}\n{\"x\":"; + + test_stream!(data, Value, |stream| { + assert_eq!(stream.next().unwrap().unwrap()["x"], 40); + assert_eq!(stream.byte_offset(), 8); + + assert!(stream.next().unwrap().unwrap_err().is_eof()); + assert_eq!(stream.byte_offset(), 9); + }); +} + +#[test] +fn test_json_stream_truncated_decimal() { + let data = "{\"x\":4."; + + test_stream!(data, Value, |stream| { + assert!(stream.next().unwrap().unwrap_err().is_eof()); + assert_eq!(stream.byte_offset(), 0); + }); +} + +#[test] +fn test_json_stream_truncated_negative() { + let data = "{\"x\":-"; + + test_stream!(data, Value, |stream| { + assert!(stream.next().unwrap().unwrap_err().is_eof()); + assert_eq!(stream.byte_offset(), 0); + }); +} + +#[test] +fn test_json_stream_truncated_exponent() { + let data = "{\"x\":4e"; + + test_stream!(data, Value, |stream| { + assert!(stream.next().unwrap().unwrap_err().is_eof()); + assert_eq!(stream.byte_offset(), 0); + }); +} + +#[test] +fn test_json_stream_empty() { + let data = ""; + + test_stream!(data, Value, |stream| { + assert!(stream.next().is_none()); + assert_eq!(stream.byte_offset(), 0); + }); +} + +#[test] +fn test_json_stream_primitive() { + let data = "{} true{}1[]\nfalse\"hey\"2 "; + + test_stream!(data, Value, |stream| { + assert_eq!(stream.next().unwrap().unwrap(), json!({})); + assert_eq!(stream.byte_offset(), 2); + + assert_eq!(stream.next().unwrap().unwrap(), true); + assert_eq!(stream.byte_offset(), 7); + + assert_eq!(stream.next().unwrap().unwrap(), json!({})); + assert_eq!(stream.byte_offset(), 9); + + assert_eq!(stream.next().unwrap().unwrap(), 1); + assert_eq!(stream.byte_offset(), 10); + + assert_eq!(stream.next().unwrap().unwrap(), json!([])); + assert_eq!(stream.byte_offset(), 12); + + assert_eq!(stream.next().unwrap().unwrap(), false); + assert_eq!(stream.byte_offset(), 18); + + assert_eq!(stream.next().unwrap().unwrap(), "hey"); + assert_eq!(stream.byte_offset(), 23); + + assert_eq!(stream.next().unwrap().unwrap(), 2); + assert_eq!(stream.byte_offset(), 24); + + assert!(stream.next().is_none()); + assert_eq!(stream.byte_offset(), 25); + }); +} + +#[test] +fn test_json_stream_invalid_literal() { + let data = "truefalse"; + + test_stream!(data, Value, |stream| { + let second = stream.next().unwrap().unwrap_err(); + assert_eq!(second.to_string(), "trailing characters at line 1 column 5"); + }); +} + +#[test] +fn test_json_stream_invalid_number() { + let data = "1true"; + + test_stream!(data, Value, |stream| { + let second = stream.next().unwrap().unwrap_err(); + assert_eq!(second.to_string(), "trailing characters at line 1 column 2"); + }); +} + +#[test] +fn test_error() { + let data = "true wrong false"; + + test_stream!(data, Value, |stream| { + assert_eq!(stream.next().unwrap().unwrap(), true); + assert!(stream.next().unwrap().is_err()); + assert!(stream.next().is_none()); + }); +} diff --git a/vendor/serde_json/tests/test.rs b/vendor/serde_json/tests/test.rs new file mode 100644 index 000000000..13d30c490 --- /dev/null +++ b/vendor/serde_json/tests/test.rs @@ -0,0 +1,2387 @@ +#![cfg(not(feature = "preserve_order"))] +#![allow( + clippy::cast_precision_loss, + clippy::derive_partial_eq_without_eq, + clippy::excessive_precision, + clippy::float_cmp, + clippy::items_after_statements, + clippy::let_underscore_drop, + clippy::shadow_unrelated, + clippy::too_many_lines, + clippy::unreadable_literal, + clippy::unseparated_literal_suffix, + clippy::vec_init_then_push, + clippy::zero_sized_map_values +)] +#![cfg_attr(feature = "trace-macros", feature(trace_macros))] +#[cfg(feature = "trace-macros")] +trace_macros!(true); + +#[macro_use] +mod macros; + +#[cfg(feature = "raw_value")] +use ref_cast::RefCast; +use serde::de::{self, IgnoredAny, IntoDeserializer}; +use serde::ser::{self, SerializeMap, SerializeSeq, Serializer}; +use serde::{Deserialize, Serialize}; +use serde_bytes::{ByteBuf, Bytes}; +#[cfg(feature = "raw_value")] +use serde_json::value::RawValue; +use serde_json::{ + from_reader, from_slice, from_str, from_value, json, to_string, to_string_pretty, to_value, + to_vec, Deserializer, Number, Value, +}; +use std::collections::hash_map::DefaultHasher; +use std::collections::BTreeMap; +#[cfg(feature = "raw_value")] +use std::collections::HashMap; +use std::fmt::{self, Debug}; +use std::hash::{Hash, Hasher}; +use std::io; +use std::iter; +use std::marker::PhantomData; +use std::mem; +use std::str::FromStr; +use std::string::ToString; +use std::{f32, f64}; +use std::{i16, i32, i64, i8}; +use std::{u16, u32, u64, u8}; + +macro_rules! treemap { + () => { + BTreeMap::new() + }; + ($($k:expr => $v:expr),+) => { + { + let mut m = BTreeMap::new(); + $( + m.insert($k, $v); + )+ + m + } + }; +} + +#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] +#[serde(deny_unknown_fields)] +enum Animal { + Dog, + Frog(String, Vec<isize>), + Cat { age: usize, name: String }, + AntHive(Vec<String>), +} + +#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] +struct Inner { + a: (), + b: usize, + c: Vec<String>, +} + +#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] +struct Outer { + inner: Vec<Inner>, +} + +fn test_encode_ok<T>(errors: &[(T, &str)]) +where + T: PartialEq + Debug + ser::Serialize, +{ + for &(ref value, out) in errors { + let out = out.to_string(); + + let s = to_string(value).unwrap(); + assert_eq!(s, out); + + let v = to_value(&value).unwrap(); + let s = to_string(&v).unwrap(); + assert_eq!(s, out); + } +} + +fn test_pretty_encode_ok<T>(errors: &[(T, &str)]) +where + T: PartialEq + Debug + ser::Serialize, +{ + for &(ref value, out) in errors { + let out = out.to_string(); + + let s = to_string_pretty(value).unwrap(); + assert_eq!(s, out); + + let v = to_value(&value).unwrap(); + let s = to_string_pretty(&v).unwrap(); + assert_eq!(s, out); + } +} + +#[test] +fn test_write_null() { + let tests = &[((), "null")]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_write_u64() { + let tests = &[(3u64, "3"), (u64::MAX, &u64::MAX.to_string())]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_write_i64() { + let tests = &[ + (3i64, "3"), + (-2i64, "-2"), + (-1234i64, "-1234"), + (i64::MIN, &i64::MIN.to_string()), + ]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_write_f64() { + let tests = &[ + (3.0, "3.0"), + (3.1, "3.1"), + (-1.5, "-1.5"), + (0.5, "0.5"), + (f64::MIN, "-1.7976931348623157e308"), + (f64::MAX, "1.7976931348623157e308"), + (f64::EPSILON, "2.220446049250313e-16"), + ]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_encode_nonfinite_float_yields_null() { + let v = to_value(::std::f64::NAN).unwrap(); + assert!(v.is_null()); + + let v = to_value(::std::f64::INFINITY).unwrap(); + assert!(v.is_null()); + + let v = to_value(::std::f32::NAN).unwrap(); + assert!(v.is_null()); + + let v = to_value(::std::f32::INFINITY).unwrap(); + assert!(v.is_null()); +} + +#[test] +fn test_write_str() { + let tests = &[("", "\"\""), ("foo", "\"foo\"")]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_write_bool() { + let tests = &[(true, "true"), (false, "false")]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_write_char() { + let tests = &[ + ('n', "\"n\""), + ('"', "\"\\\"\""), + ('\\', "\"\\\\\""), + ('/', "\"/\""), + ('\x08', "\"\\b\""), + ('\x0C', "\"\\f\""), + ('\n', "\"\\n\""), + ('\r', "\"\\r\""), + ('\t', "\"\\t\""), + ('\x0B', "\"\\u000b\""), + ('\u{3A3}', "\"\u{3A3}\""), + ]; + test_encode_ok(tests); + test_pretty_encode_ok(tests); +} + +#[test] +fn test_write_list() { + test_encode_ok(&[ + (vec![], "[]"), + (vec![true], "[true]"), + (vec![true, false], "[true,false]"), + ]); + + test_encode_ok(&[ + (vec![vec![], vec![], vec![]], "[[],[],[]]"), + (vec![vec![1, 2, 3], vec![], vec![]], "[[1,2,3],[],[]]"), + (vec![vec![], vec![1, 2, 3], vec![]], "[[],[1,2,3],[]]"), + (vec![vec![], vec![], vec![1, 2, 3]], "[[],[],[1,2,3]]"), + ]); + + test_pretty_encode_ok(&[ + (vec![vec![], vec![], vec![]], pretty_str!([[], [], []])), + ( + vec![vec![1, 2, 3], vec![], vec![]], + pretty_str!([[1, 2, 3], [], []]), + ), + ( + vec![vec![], vec![1, 2, 3], vec![]], + pretty_str!([[], [1, 2, 3], []]), + ), + ( + vec![vec![], vec![], vec![1, 2, 3]], + pretty_str!([[], [], [1, 2, 3]]), + ), + ]); + + test_pretty_encode_ok(&[ + (vec![], "[]"), + (vec![true], pretty_str!([true])), + (vec![true, false], pretty_str!([true, false])), + ]); + + let long_test_list = json!([false, null, ["foo\nbar", 3.5]]); + + test_encode_ok(&[( + long_test_list.clone(), + json_str!([false, null, ["foo\nbar", 3.5]]), + )]); + + test_pretty_encode_ok(&[( + long_test_list, + pretty_str!([false, null, ["foo\nbar", 3.5]]), + )]); +} + +#[test] +fn test_write_object() { + test_encode_ok(&[ + (treemap!(), "{}"), + (treemap!("a".to_string() => true), "{\"a\":true}"), + ( + treemap!( + "a".to_string() => true, + "b".to_string() => false + ), + "{\"a\":true,\"b\":false}", + ), + ]); + + test_encode_ok(&[ + ( + treemap![ + "a".to_string() => treemap![], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + "{\"a\":{},\"b\":{},\"c\":{}}", + ), + ( + treemap![ + "a".to_string() => treemap![ + "a".to_string() => treemap!["a" => vec![1,2,3]], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + "{\"a\":{\"a\":{\"a\":[1,2,3]},\"b\":{},\"c\":{}},\"b\":{},\"c\":{}}", + ), + ( + treemap![ + "a".to_string() => treemap![], + "b".to_string() => treemap![ + "a".to_string() => treemap!["a" => vec![1,2,3]], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + "c".to_string() => treemap![] + ], + "{\"a\":{},\"b\":{\"a\":{\"a\":[1,2,3]},\"b\":{},\"c\":{}},\"c\":{}}", + ), + ( + treemap![ + "a".to_string() => treemap![], + "b".to_string() => treemap![], + "c".to_string() => treemap![ + "a".to_string() => treemap!["a" => vec![1,2,3]], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ] + ], + "{\"a\":{},\"b\":{},\"c\":{\"a\":{\"a\":[1,2,3]},\"b\":{},\"c\":{}}}", + ), + ]); + + test_encode_ok(&[(treemap!['c' => ()], "{\"c\":null}")]); + + test_pretty_encode_ok(&[ + ( + treemap![ + "a".to_string() => treemap![], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + pretty_str!({ + "a": {}, + "b": {}, + "c": {} + }), + ), + ( + treemap![ + "a".to_string() => treemap![ + "a".to_string() => treemap!["a" => vec![1,2,3]], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + pretty_str!({ + "a": { + "a": { + "a": [ + 1, + 2, + 3 + ] + }, + "b": {}, + "c": {} + }, + "b": {}, + "c": {} + }), + ), + ( + treemap![ + "a".to_string() => treemap![], + "b".to_string() => treemap![ + "a".to_string() => treemap!["a" => vec![1,2,3]], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ], + "c".to_string() => treemap![] + ], + pretty_str!({ + "a": {}, + "b": { + "a": { + "a": [ + 1, + 2, + 3 + ] + }, + "b": {}, + "c": {} + }, + "c": {} + }), + ), + ( + treemap![ + "a".to_string() => treemap![], + "b".to_string() => treemap![], + "c".to_string() => treemap![ + "a".to_string() => treemap!["a" => vec![1,2,3]], + "b".to_string() => treemap![], + "c".to_string() => treemap![] + ] + ], + pretty_str!({ + "a": {}, + "b": {}, + "c": { + "a": { + "a": [ + 1, + 2, + 3 + ] + }, + "b": {}, + "c": {} + } + }), + ), + ]); + + test_pretty_encode_ok(&[ + (treemap!(), "{}"), + ( + treemap!("a".to_string() => true), + pretty_str!({ + "a": true + }), + ), + ( + treemap!( + "a".to_string() => true, + "b".to_string() => false + ), + pretty_str!( { + "a": true, + "b": false + }), + ), + ]); + + let complex_obj = json!({ + "b": [ + {"c": "\x0c\x1f\r"}, + {"d": ""} + ] + }); + + test_encode_ok(&[( + complex_obj.clone(), + json_str!({ + "b": [ + { + "c": (r#""\f\u001f\r""#) + }, + { + "d": "" + } + ] + }), + )]); + + test_pretty_encode_ok(&[( + complex_obj, + pretty_str!({ + "b": [ + { + "c": (r#""\f\u001f\r""#) + }, + { + "d": "" + } + ] + }), + )]); +} + +#[test] +fn test_write_tuple() { + test_encode_ok(&[((5,), "[5]")]); + + test_pretty_encode_ok(&[((5,), pretty_str!([5]))]); + + test_encode_ok(&[((5, (6, "abc")), "[5,[6,\"abc\"]]")]); + + test_pretty_encode_ok(&[((5, (6, "abc")), pretty_str!([5, [6, "abc"]]))]); +} + +#[test] +fn test_write_enum() { + test_encode_ok(&[ + (Animal::Dog, "\"Dog\""), + ( + Animal::Frog("Henry".to_string(), vec![]), + "{\"Frog\":[\"Henry\",[]]}", + ), + ( + Animal::Frog("Henry".to_string(), vec![349]), + "{\"Frog\":[\"Henry\",[349]]}", + ), + ( + Animal::Frog("Henry".to_string(), vec![349, 102]), + "{\"Frog\":[\"Henry\",[349,102]]}", + ), + ( + Animal::Cat { + age: 5, + name: "Kate".to_string(), + }, + "{\"Cat\":{\"age\":5,\"name\":\"Kate\"}}", + ), + ( + Animal::AntHive(vec!["Bob".to_string(), "Stuart".to_string()]), + "{\"AntHive\":[\"Bob\",\"Stuart\"]}", + ), + ]); + + test_pretty_encode_ok(&[ + (Animal::Dog, "\"Dog\""), + ( + Animal::Frog("Henry".to_string(), vec![]), + pretty_str!({ + "Frog": [ + "Henry", + [] + ] + }), + ), + ( + Animal::Frog("Henry".to_string(), vec![349]), + pretty_str!({ + "Frog": [ + "Henry", + [ + 349 + ] + ] + }), + ), + ( + Animal::Frog("Henry".to_string(), vec![349, 102]), + pretty_str!({ + "Frog": [ + "Henry", + [ + 349, + 102 + ] + ] + }), + ), + ]); +} + +#[test] +fn test_write_option() { + test_encode_ok(&[(None, "null"), (Some("jodhpurs"), "\"jodhpurs\"")]); + + test_encode_ok(&[ + (None, "null"), + (Some(vec!["foo", "bar"]), "[\"foo\",\"bar\"]"), + ]); + + test_pretty_encode_ok(&[(None, "null"), (Some("jodhpurs"), "\"jodhpurs\"")]); + + test_pretty_encode_ok(&[ + (None, "null"), + (Some(vec!["foo", "bar"]), pretty_str!(["foo", "bar"])), + ]); +} + +#[test] +fn test_write_newtype_struct() { + #[derive(Serialize, PartialEq, Debug)] + struct Newtype(BTreeMap<String, i32>); + + let inner = Newtype(treemap!(String::from("inner") => 123)); + let outer = treemap!(String::from("outer") => to_value(&inner).unwrap()); + + test_encode_ok(&[(inner, r#"{"inner":123}"#)]); + + test_encode_ok(&[(outer, r#"{"outer":{"inner":123}}"#)]); +} + +#[test] +fn test_deserialize_number_to_untagged_enum() { + #[derive(Eq, PartialEq, Deserialize, Debug)] + #[serde(untagged)] + enum E { + N(i64), + } + + assert_eq!(E::N(0), E::deserialize(Number::from(0)).unwrap()); +} + +fn test_parse_ok<T>(tests: Vec<(&str, T)>) +where + T: Clone + Debug + PartialEq + ser::Serialize + de::DeserializeOwned, +{ + for (s, value) in tests { + let v: T = from_str(s).unwrap(); + assert_eq!(v, value.clone()); + + let v: T = from_slice(s.as_bytes()).unwrap(); + assert_eq!(v, value.clone()); + + // Make sure we can deserialize into a `Value`. + let json_value: Value = from_str(s).unwrap(); + assert_eq!(json_value, to_value(&value).unwrap()); + + // Make sure we can deserialize from a `&Value`. + let v = T::deserialize(&json_value).unwrap(); + assert_eq!(v, value); + + // Make sure we can deserialize from a `Value`. + let v: T = from_value(json_value.clone()).unwrap(); + assert_eq!(v, value); + + // Make sure we can round trip back to `Value`. + let json_value2: Value = from_value(json_value.clone()).unwrap(); + assert_eq!(json_value2, json_value); + + // Make sure we can fully ignore. + let twoline = s.to_owned() + "\n3735928559"; + let mut de = Deserializer::from_str(&twoline); + IgnoredAny::deserialize(&mut de).unwrap(); + assert_eq!(0xDEAD_BEEF, u64::deserialize(&mut de).unwrap()); + + // Make sure every prefix is an EOF error, except that a prefix of a + // number may be a valid number. + if !json_value.is_number() { + for (i, _) in s.trim_end().char_indices() { + assert!(from_str::<Value>(&s[..i]).unwrap_err().is_eof()); + assert!(from_str::<IgnoredAny>(&s[..i]).unwrap_err().is_eof()); + } + } + } +} + +// For testing representations that the deserializer accepts but the serializer +// never generates. These do not survive a round-trip through Value. +fn test_parse_unusual_ok<T>(tests: Vec<(&str, T)>) +where + T: Clone + Debug + PartialEq + ser::Serialize + de::DeserializeOwned, +{ + for (s, value) in tests { + let v: T = from_str(s).unwrap(); + assert_eq!(v, value.clone()); + + let v: T = from_slice(s.as_bytes()).unwrap(); + assert_eq!(v, value.clone()); + } +} + +macro_rules! test_parse_err { + ($name:ident::<$($ty:ty),*>($arg:expr) => $expected:expr) => { + let actual = $name::<$($ty),*>($arg).unwrap_err().to_string(); + assert_eq!(actual, $expected, "unexpected {} error", stringify!($name)); + }; +} + +fn test_parse_err<T>(errors: &[(&str, &'static str)]) +where + T: Debug + PartialEq + de::DeserializeOwned, +{ + for &(s, err) in errors { + test_parse_err!(from_str::<T>(s) => err); + test_parse_err!(from_slice::<T>(s.as_bytes()) => err); + } +} + +fn test_parse_slice_err<T>(errors: &[(&[u8], &'static str)]) +where + T: Debug + PartialEq + de::DeserializeOwned, +{ + for &(s, err) in errors { + test_parse_err!(from_slice::<T>(s) => err); + } +} + +fn test_fromstr_parse_err<T>(errors: &[(&str, &'static str)]) +where + T: Debug + PartialEq + FromStr, + <T as FromStr>::Err: ToString, +{ + for &(s, err) in errors { + let actual = s.parse::<T>().unwrap_err().to_string(); + assert_eq!(actual, err, "unexpected parsing error"); + } +} + +#[test] +fn test_parse_null() { + test_parse_err::<()>(&[ + ("n", "EOF while parsing a value at line 1 column 1"), + ("nul", "EOF while parsing a value at line 1 column 3"), + ("nulla", "trailing characters at line 1 column 5"), + ]); + + test_parse_ok(vec![("null", ())]); +} + +#[test] +fn test_parse_bool() { + test_parse_err::<bool>(&[ + ("t", "EOF while parsing a value at line 1 column 1"), + ("truz", "expected ident at line 1 column 4"), + ("f", "EOF while parsing a value at line 1 column 1"), + ("faz", "expected ident at line 1 column 3"), + ("truea", "trailing characters at line 1 column 5"), + ("falsea", "trailing characters at line 1 column 6"), + ]); + + test_parse_ok(vec![ + ("true", true), + (" true ", true), + ("false", false), + (" false ", false), + ]); +} + +#[test] +fn test_parse_char() { + test_parse_err::<char>(&[ + ( + "\"ab\"", + "invalid value: string \"ab\", expected a character at line 1 column 4", + ), + ( + "10", + "invalid type: integer `10`, expected a character at line 1 column 2", + ), + ]); + + test_parse_ok(vec![ + ("\"n\"", 'n'), + ("\"\\\"\"", '"'), + ("\"\\\\\"", '\\'), + ("\"/\"", '/'), + ("\"\\b\"", '\x08'), + ("\"\\f\"", '\x0C'), + ("\"\\n\"", '\n'), + ("\"\\r\"", '\r'), + ("\"\\t\"", '\t'), + ("\"\\u000b\"", '\x0B'), + ("\"\\u000B\"", '\x0B'), + ("\"\u{3A3}\"", '\u{3A3}'), + ]); +} + +#[test] +fn test_parse_number_errors() { + test_parse_err::<f64>(&[ + ("+", "expected value at line 1 column 1"), + (".", "expected value at line 1 column 1"), + ("-", "EOF while parsing a value at line 1 column 1"), + ("00", "invalid number at line 1 column 2"), + ("0x80", "trailing characters at line 1 column 2"), + ("\\0", "expected value at line 1 column 1"), + (".0", "expected value at line 1 column 1"), + ("0.", "EOF while parsing a value at line 1 column 2"), + ("1.", "EOF while parsing a value at line 1 column 2"), + ("1.a", "invalid number at line 1 column 3"), + ("1.e1", "invalid number at line 1 column 3"), + ("1e", "EOF while parsing a value at line 1 column 2"), + ("1e+", "EOF while parsing a value at line 1 column 3"), + ("1a", "trailing characters at line 1 column 2"), + ( + "100e777777777777777777777777777", + "number out of range at line 1 column 14", + ), + ( + "-100e777777777777777777777777777", + "number out of range at line 1 column 15", + ), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000", // 1e309 + "number out of range at line 1 column 310", + ), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + .0e9", // 1e309 + "number out of range at line 1 column 305", + ), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + e9", // 1e309 + "number out of range at line 1 column 303", + ), + ]); +} + +#[test] +fn test_parse_i64() { + test_parse_ok(vec![ + ("-2", -2), + ("-1234", -1234), + (" -1234 ", -1234), + (&i64::MIN.to_string(), i64::MIN), + (&i64::MAX.to_string(), i64::MAX), + ]); +} + +#[test] +fn test_parse_u64() { + test_parse_ok(vec![ + ("0", 0u64), + ("3", 3u64), + ("1234", 1234), + (&u64::MAX.to_string(), u64::MAX), + ]); +} + +#[test] +fn test_parse_negative_zero() { + for negative_zero in &[ + "-0", + "-0.0", + "-0e2", + "-0.0e2", + "-1e-400", + "-1e-4000000000000000000000000000000000000000000000000", + ] { + assert!( + from_str::<f32>(negative_zero).unwrap().is_sign_negative(), + "should have been negative: {:?}", + negative_zero, + ); + assert!( + from_str::<f64>(negative_zero).unwrap().is_sign_negative(), + "should have been negative: {:?}", + negative_zero, + ); + } +} + +#[test] +fn test_parse_f64() { + test_parse_ok(vec![ + ("0.0", 0.0f64), + ("3.0", 3.0f64), + ("3.1", 3.1), + ("-1.2", -1.2), + ("0.4", 0.4), + // Edge case from: + // https://github.com/serde-rs/json/issues/536#issuecomment-583714900 + ("2.638344616030823e-256", 2.638344616030823e-256), + ]); + + #[cfg(not(feature = "arbitrary_precision"))] + test_parse_ok(vec![ + // With arbitrary-precision enabled, this parses as Number{"3.00"} + // but the float is Number{"3.0"} + ("3.00", 3.0f64), + ("0.4e5", 0.4e5), + ("0.4e+5", 0.4e5), + ("0.4e15", 0.4e15), + ("0.4e+15", 0.4e15), + ("0.4e-01", 0.4e-1), + (" 0.4e-01 ", 0.4e-1), + ("0.4e-001", 0.4e-1), + ("0.4e-0", 0.4e0), + ("0.00e00", 0.0), + ("0.00e+00", 0.0), + ("0.00e-00", 0.0), + ("3.5E-2147483647", 0.0), + ("0.0100000000000000000001", 0.01), + ( + &format!("{}", (i64::MIN as f64) - 1.0), + (i64::MIN as f64) - 1.0, + ), + ( + &format!("{}", (u64::MAX as f64) + 1.0), + (u64::MAX as f64) + 1.0, + ), + (&format!("{}", f64::EPSILON), f64::EPSILON), + ( + "0.0000000000000000000000000000000000000000000000000123e50", + 1.23, + ), + ("100e-777777777777777777777777777", 0.0), + ( + "1010101010101010101010101010101010101010", + 10101010101010101010e20, + ), + ( + "0.1010101010101010101010101010101010101010", + 0.1010101010101010101, + ), + ("0e1000000000000000000000000000000000000000000000", 0.0), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 00000000", + 1e308, + ), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + .0e8", + 1e308, + ), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + e8", + 1e308, + ), + ( + "1000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000000000000000000000000000000000000000000000\ + 000000000000000000e-10", + 1e308, + ), + ]); +} + +#[test] +fn test_value_as_f64() { + let v = serde_json::from_str::<Value>("1e1000"); + + #[cfg(not(feature = "arbitrary_precision"))] + assert!(v.is_err()); + + #[cfg(feature = "arbitrary_precision")] + assert_eq!(v.unwrap().as_f64(), None); +} + +// Test roundtrip with some values that were not perfectly roundtripped by the +// old f64 deserializer. +#[cfg(feature = "float_roundtrip")] +#[test] +fn test_roundtrip_f64() { + for &float in &[ + // Samples from quickcheck-ing roundtrip with `input: f64`. Comments + // indicate the value returned by the old deserializer. + 51.24817837550540_4, // 51.2481783755054_1 + -93.3113703768803_3, // -93.3113703768803_2 + -36.5739948427534_36, // -36.5739948427534_4 + 52.31400820410624_4, // 52.31400820410624_ + 97.4536532003468_5, // 97.4536532003468_4 + // Samples from `rng.next_u64` + `f64::from_bits` + `is_finite` filter. + 2.0030397744267762e-253, + 7.101215824554616e260, + 1.769268377902049e74, + -1.6727517818542075e58, + 3.9287532173373315e299, + ] { + let json = serde_json::to_string(&float).unwrap(); + let output: f64 = serde_json::from_str(&json).unwrap(); + assert_eq!(float, output); + } +} + +#[test] +fn test_roundtrip_f32() { + // This number has 1 ULP error if parsed via f64 and converted to f32. + // https://github.com/serde-rs/json/pull/671#issuecomment-628534468 + let float = 7.038531e-26; + let json = serde_json::to_string(&float).unwrap(); + let output: f32 = serde_json::from_str(&json).unwrap(); + assert_eq!(float, output); +} + +#[test] +fn test_serialize_char() { + let value = json!( + ({ + let mut map = BTreeMap::new(); + map.insert('c', ()); + map + }) + ); + assert_eq!(&Value::Null, value.get("c").unwrap()); +} + +#[cfg(feature = "arbitrary_precision")] +#[test] +fn test_malicious_number() { + #[derive(Serialize)] + #[serde(rename = "$serde_json::private::Number")] + struct S { + #[serde(rename = "$serde_json::private::Number")] + f: &'static str, + } + + let actual = serde_json::to_value(&S { f: "not a number" }) + .unwrap_err() + .to_string(); + assert_eq!(actual, "invalid number at line 1 column 1"); +} + +#[test] +fn test_parse_number() { + test_parse_ok(vec![ + ("0.0", Number::from_f64(0.0f64).unwrap()), + ("3.0", Number::from_f64(3.0f64).unwrap()), + ("3.1", Number::from_f64(3.1).unwrap()), + ("-1.2", Number::from_f64(-1.2).unwrap()), + ("0.4", Number::from_f64(0.4).unwrap()), + ]); + + test_fromstr_parse_err::<Number>(&[ + (" 1.0", "invalid number at line 1 column 1"), + ("1.0 ", "invalid number at line 1 column 4"), + ("\t1.0", "invalid number at line 1 column 1"), + ("1.0\t", "invalid number at line 1 column 4"), + ]); + + #[cfg(feature = "arbitrary_precision")] + test_parse_ok(vec![ + ("1e999", Number::from_string_unchecked("1e999".to_owned())), + ("1e+999", Number::from_string_unchecked("1e+999".to_owned())), + ("-1e999", Number::from_string_unchecked("-1e999".to_owned())), + ("1e-999", Number::from_string_unchecked("1e-999".to_owned())), + ("1E999", Number::from_string_unchecked("1E999".to_owned())), + ("1E+999", Number::from_string_unchecked("1E+999".to_owned())), + ("-1E999", Number::from_string_unchecked("-1E999".to_owned())), + ("1E-999", Number::from_string_unchecked("1E-999".to_owned())), + ("1E+000", Number::from_string_unchecked("1E+000".to_owned())), + ( + "2.3e999", + Number::from_string_unchecked("2.3e999".to_owned()), + ), + ( + "-2.3e999", + Number::from_string_unchecked("-2.3e999".to_owned()), + ), + ]); +} + +#[test] +fn test_parse_string() { + test_parse_err::<String>(&[ + ("\"", "EOF while parsing a string at line 1 column 1"), + ("\"lol", "EOF while parsing a string at line 1 column 4"), + ("\"lol\"a", "trailing characters at line 1 column 6"), + ( + "\"\\uD83C\\uFFFF\"", + "lone leading surrogate in hex escape at line 1 column 13", + ), + ( + "\"\n\"", + "control character (\\u0000-\\u001F) found while parsing a string at line 2 column 0", + ), + ( + "\"\x1F\"", + "control character (\\u0000-\\u001F) found while parsing a string at line 1 column 2", + ), + ]); + + test_parse_slice_err::<String>(&[ + ( + &[b'"', 159, 146, 150, b'"'], + "invalid unicode code point at line 1 column 5", + ), + ( + &[b'"', b'\\', b'n', 159, 146, 150, b'"'], + "invalid unicode code point at line 1 column 7", + ), + ( + &[b'"', b'\\', b'u', 48, 48, 51], + "EOF while parsing a string at line 1 column 6", + ), + ( + &[b'"', b'\\', b'u', 250, 48, 51, 48, b'"'], + "invalid escape at line 1 column 4", + ), + ( + &[b'"', b'\\', b'u', 48, 250, 51, 48, b'"'], + "invalid escape at line 1 column 5", + ), + ( + &[b'"', b'\\', b'u', 48, 48, 250, 48, b'"'], + "invalid escape at line 1 column 6", + ), + ( + &[b'"', b'\\', b'u', 48, 48, 51, 250, b'"'], + "invalid escape at line 1 column 7", + ), + ( + &[b'"', b'\n', b'"'], + "control character (\\u0000-\\u001F) found while parsing a string at line 2 column 0", + ), + ( + &[b'"', b'\x1F', b'"'], + "control character (\\u0000-\\u001F) found while parsing a string at line 1 column 2", + ), + ]); + + test_parse_ok(vec![ + ("\"\"", "".to_string()), + ("\"foo\"", "foo".to_string()), + (" \"foo\" ", "foo".to_string()), + ("\"\\\"\"", "\"".to_string()), + ("\"\\b\"", "\x08".to_string()), + ("\"\\n\"", "\n".to_string()), + ("\"\\r\"", "\r".to_string()), + ("\"\\t\"", "\t".to_string()), + ("\"\\u12ab\"", "\u{12ab}".to_string()), + ("\"\\uAB12\"", "\u{AB12}".to_string()), + ("\"\\uD83C\\uDF95\"", "\u{1F395}".to_string()), + ]); +} + +#[test] +fn test_parse_list() { + test_parse_err::<Vec<f64>>(&[ + ("[", "EOF while parsing a list at line 1 column 1"), + ("[ ", "EOF while parsing a list at line 1 column 2"), + ("[1", "EOF while parsing a list at line 1 column 2"), + ("[1,", "EOF while parsing a value at line 1 column 3"), + ("[1,]", "trailing comma at line 1 column 4"), + ("[1 2]", "expected `,` or `]` at line 1 column 4"), + ("[]a", "trailing characters at line 1 column 3"), + ]); + + test_parse_ok(vec![ + ("[]", vec![]), + ("[ ]", vec![]), + ("[null]", vec![()]), + (" [ null ] ", vec![()]), + ]); + + test_parse_ok(vec![("[true]", vec![true])]); + + test_parse_ok(vec![("[3,1]", vec![3u64, 1]), (" [ 3 , 1 ] ", vec![3, 1])]); + + test_parse_ok(vec![("[[3], [1, 2]]", vec![vec![3u64], vec![1, 2]])]); + + test_parse_ok(vec![("[1]", (1u64,))]); + + test_parse_ok(vec![("[1, 2]", (1u64, 2u64))]); + + test_parse_ok(vec![("[1, 2, 3]", (1u64, 2u64, 3u64))]); + + test_parse_ok(vec![("[1, [2, 3]]", (1u64, (2u64, 3u64)))]); +} + +#[test] +fn test_parse_object() { + test_parse_err::<BTreeMap<String, u32>>(&[ + ("{", "EOF while parsing an object at line 1 column 1"), + ("{ ", "EOF while parsing an object at line 1 column 2"), + ("{1", "key must be a string at line 1 column 2"), + ("{ \"a\"", "EOF while parsing an object at line 1 column 5"), + ("{\"a\"", "EOF while parsing an object at line 1 column 4"), + ("{\"a\" ", "EOF while parsing an object at line 1 column 5"), + ("{\"a\" 1", "expected `:` at line 1 column 6"), + ("{\"a\":", "EOF while parsing a value at line 1 column 5"), + ("{\"a\":1", "EOF while parsing an object at line 1 column 6"), + ("{\"a\":1 1", "expected `,` or `}` at line 1 column 8"), + ("{\"a\":1,", "EOF while parsing a value at line 1 column 7"), + ("{}a", "trailing characters at line 1 column 3"), + ]); + + test_parse_ok(vec![ + ("{}", treemap!()), + ("{ }", treemap!()), + ("{\"a\":3}", treemap!("a".to_string() => 3u64)), + ("{ \"a\" : 3 }", treemap!("a".to_string() => 3)), + ( + "{\"a\":3,\"b\":4}", + treemap!("a".to_string() => 3, "b".to_string() => 4), + ), + ( + " { \"a\" : 3 , \"b\" : 4 } ", + treemap!("a".to_string() => 3, "b".to_string() => 4), + ), + ]); + + test_parse_ok(vec![( + "{\"a\": {\"b\": 3, \"c\": 4}}", + treemap!( + "a".to_string() => treemap!( + "b".to_string() => 3u64, + "c".to_string() => 4 + ) + ), + )]); + + test_parse_ok(vec![("{\"c\":null}", treemap!('c' => ()))]); +} + +#[test] +fn test_parse_struct() { + test_parse_err::<Outer>(&[ + ( + "5", + "invalid type: integer `5`, expected struct Outer at line 1 column 1", + ), + ( + "\"hello\"", + "invalid type: string \"hello\", expected struct Outer at line 1 column 7", + ), + ( + "{\"inner\": true}", + "invalid type: boolean `true`, expected a sequence at line 1 column 14", + ), + ("{}", "missing field `inner` at line 1 column 2"), + ( + r#"{"inner": [{"b": 42, "c": []}]}"#, + "missing field `a` at line 1 column 29", + ), + ]); + + test_parse_ok(vec![ + ( + "{ + \"inner\": [] + }", + Outer { inner: vec![] }, + ), + ( + "{ + \"inner\": [ + { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] } + ] + }", + Outer { + inner: vec![Inner { + a: (), + b: 2, + c: vec!["abc".to_string(), "xyz".to_string()], + }], + }, + ), + ]); + + let v: Outer = from_str( + "[ + [ + [ null, 2, [\"abc\", \"xyz\"] ] + ] + ]", + ) + .unwrap(); + + assert_eq!( + v, + Outer { + inner: vec![Inner { + a: (), + b: 2, + c: vec!["abc".to_string(), "xyz".to_string()], + }], + } + ); + + let j = json!([null, 2, []]); + Inner::deserialize(&j).unwrap(); + Inner::deserialize(j).unwrap(); +} + +#[test] +fn test_parse_option() { + test_parse_ok(vec![ + ("null", None::<String>), + ("\"jodhpurs\"", Some("jodhpurs".to_string())), + ]); + + #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] + struct Foo { + x: Option<isize>, + } + + let value: Foo = from_str("{}").unwrap(); + assert_eq!(value, Foo { x: None }); + + test_parse_ok(vec![ + ("{\"x\": null}", Foo { x: None }), + ("{\"x\": 5}", Foo { x: Some(5) }), + ]); +} + +#[test] +fn test_parse_enum_errors() { + test_parse_err::<Animal>( + &[ + ("{}", "expected value at line 1 column 2"), + ("[]", "expected value at line 1 column 1"), + ("\"unknown\"", + "unknown variant `unknown`, expected one of `Dog`, `Frog`, `Cat`, `AntHive` at line 1 column 9"), + ("{\"unknown\":null}", + "unknown variant `unknown`, expected one of `Dog`, `Frog`, `Cat`, `AntHive` at line 1 column 10"), + ("{\"Dog\":", "EOF while parsing a value at line 1 column 7"), + ("{\"Dog\":}", "expected value at line 1 column 8"), + ("{\"Dog\":{}}", "invalid type: map, expected unit at line 1 column 7"), + ("\"Frog\"", "invalid type: unit variant, expected tuple variant"), + ("\"Frog\" 0 ", "invalid type: unit variant, expected tuple variant"), + ("{\"Frog\":{}}", + "invalid type: map, expected tuple variant Animal::Frog at line 1 column 8"), + ("{\"Cat\":[]}", "invalid length 0, expected struct variant Animal::Cat with 2 elements at line 1 column 9"), + ("{\"Cat\":[0]}", "invalid length 1, expected struct variant Animal::Cat with 2 elements at line 1 column 10"), + ("{\"Cat\":[0, \"\", 2]}", "trailing characters at line 1 column 16"), + ("{\"Cat\":{\"age\": 5, \"name\": \"Kate\", \"foo\":\"bar\"}", + "unknown field `foo`, expected `age` or `name` at line 1 column 39"), + + // JSON does not allow trailing commas in data structures + ("{\"Cat\":[0, \"Kate\",]}", "trailing comma at line 1 column 19"), + ("{\"Cat\":{\"age\": 2, \"name\": \"Kate\",}}", + "trailing comma at line 1 column 34"), + ], + ); +} + +#[test] +fn test_parse_enum() { + test_parse_ok(vec![ + ("\"Dog\"", Animal::Dog), + (" \"Dog\" ", Animal::Dog), + ( + "{\"Frog\":[\"Henry\",[]]}", + Animal::Frog("Henry".to_string(), vec![]), + ), + ( + " { \"Frog\": [ \"Henry\" , [ 349, 102 ] ] } ", + Animal::Frog("Henry".to_string(), vec![349, 102]), + ), + ( + "{\"Cat\": {\"age\": 5, \"name\": \"Kate\"}}", + Animal::Cat { + age: 5, + name: "Kate".to_string(), + }, + ), + ( + " { \"Cat\" : { \"age\" : 5 , \"name\" : \"Kate\" } } ", + Animal::Cat { + age: 5, + name: "Kate".to_string(), + }, + ), + ( + " { \"AntHive\" : [\"Bob\", \"Stuart\"] } ", + Animal::AntHive(vec!["Bob".to_string(), "Stuart".to_string()]), + ), + ]); + + test_parse_unusual_ok(vec![ + ("{\"Dog\":null}", Animal::Dog), + (" { \"Dog\" : null } ", Animal::Dog), + ]); + + test_parse_ok(vec![( + concat!( + "{", + " \"a\": \"Dog\",", + " \"b\": {\"Frog\":[\"Henry\", []]}", + "}" + ), + treemap!( + "a".to_string() => Animal::Dog, + "b".to_string() => Animal::Frog("Henry".to_string(), vec![]) + ), + )]); +} + +#[test] +fn test_parse_trailing_whitespace() { + test_parse_ok(vec![ + ("[1, 2] ", vec![1u64, 2]), + ("[1, 2]\n", vec![1, 2]), + ("[1, 2]\t", vec![1, 2]), + ("[1, 2]\t \n", vec![1, 2]), + ]); +} + +#[test] +fn test_multiline_errors() { + test_parse_err::<BTreeMap<String, String>>(&[( + "{\n \"foo\":\n \"bar\"", + "EOF while parsing an object at line 3 column 6", + )]); +} + +#[test] +fn test_missing_option_field() { + #[derive(Debug, PartialEq, Deserialize)] + struct Foo { + x: Option<u32>, + } + + let value: Foo = from_str("{}").unwrap(); + assert_eq!(value, Foo { x: None }); + + let value: Foo = from_str("{\"x\": 5}").unwrap(); + assert_eq!(value, Foo { x: Some(5) }); + + let value: Foo = from_value(json!({})).unwrap(); + assert_eq!(value, Foo { x: None }); + + let value: Foo = from_value(json!({"x": 5})).unwrap(); + assert_eq!(value, Foo { x: Some(5) }); +} + +#[test] +fn test_missing_nonoption_field() { + #[derive(Debug, PartialEq, Deserialize)] + struct Foo { + x: u32, + } + + test_parse_err::<Foo>(&[("{}", "missing field `x` at line 1 column 2")]); +} + +#[test] +fn test_missing_renamed_field() { + #[derive(Debug, PartialEq, Deserialize)] + struct Foo { + #[serde(rename = "y")] + x: Option<u32>, + } + + let value: Foo = from_str("{}").unwrap(); + assert_eq!(value, Foo { x: None }); + + let value: Foo = from_str("{\"y\": 5}").unwrap(); + assert_eq!(value, Foo { x: Some(5) }); + + let value: Foo = from_value(json!({})).unwrap(); + assert_eq!(value, Foo { x: None }); + + let value: Foo = from_value(json!({"y": 5})).unwrap(); + assert_eq!(value, Foo { x: Some(5) }); +} + +#[test] +fn test_serialize_seq_with_no_len() { + #[derive(Clone, Debug, PartialEq)] + struct MyVec<T>(Vec<T>); + + impl<T> ser::Serialize for MyVec<T> + where + T: ser::Serialize, + { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: ser::Serializer, + { + let mut seq = serializer.serialize_seq(None)?; + for elem in &self.0 { + seq.serialize_element(elem)?; + } + seq.end() + } + } + + struct Visitor<T> { + marker: PhantomData<MyVec<T>>, + } + + impl<'de, T> de::Visitor<'de> for Visitor<T> + where + T: de::Deserialize<'de>, + { + type Value = MyVec<T>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("array") + } + + #[inline] + fn visit_unit<E>(self) -> Result<MyVec<T>, E> + where + E: de::Error, + { + Ok(MyVec(Vec::new())) + } + + #[inline] + fn visit_seq<V>(self, mut visitor: V) -> Result<MyVec<T>, V::Error> + where + V: de::SeqAccess<'de>, + { + let mut values = Vec::new(); + + while let Some(value) = visitor.next_element()? { + values.push(value); + } + + Ok(MyVec(values)) + } + } + + impl<'de, T> de::Deserialize<'de> for MyVec<T> + where + T: de::Deserialize<'de>, + { + fn deserialize<D>(deserializer: D) -> Result<MyVec<T>, D::Error> + where + D: de::Deserializer<'de>, + { + deserializer.deserialize_map(Visitor { + marker: PhantomData, + }) + } + } + + let mut vec = Vec::new(); + vec.push(MyVec(Vec::new())); + vec.push(MyVec(Vec::new())); + let vec: MyVec<MyVec<u32>> = MyVec(vec); + + test_encode_ok(&[(vec.clone(), "[[],[]]")]); + + let s = to_string_pretty(&vec).unwrap(); + let expected = pretty_str!([[], []]); + assert_eq!(s, expected); +} + +#[test] +fn test_serialize_map_with_no_len() { + #[derive(Clone, Debug, PartialEq)] + struct MyMap<K, V>(BTreeMap<K, V>); + + impl<K, V> ser::Serialize for MyMap<K, V> + where + K: ser::Serialize + Ord, + V: ser::Serialize, + { + #[inline] + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: ser::Serializer, + { + let mut map = serializer.serialize_map(None)?; + for (k, v) in &self.0 { + map.serialize_entry(k, v)?; + } + map.end() + } + } + + struct Visitor<K, V> { + marker: PhantomData<MyMap<K, V>>, + } + + impl<'de, K, V> de::Visitor<'de> for Visitor<K, V> + where + K: de::Deserialize<'de> + Eq + Ord, + V: de::Deserialize<'de>, + { + type Value = MyMap<K, V>; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + formatter.write_str("map") + } + + #[inline] + fn visit_unit<E>(self) -> Result<MyMap<K, V>, E> + where + E: de::Error, + { + Ok(MyMap(BTreeMap::new())) + } + + #[inline] + fn visit_map<Visitor>(self, mut visitor: Visitor) -> Result<MyMap<K, V>, Visitor::Error> + where + Visitor: de::MapAccess<'de>, + { + let mut values = BTreeMap::new(); + + while let Some((key, value)) = visitor.next_entry()? { + values.insert(key, value); + } + + Ok(MyMap(values)) + } + } + + impl<'de, K, V> de::Deserialize<'de> for MyMap<K, V> + where + K: de::Deserialize<'de> + Eq + Ord, + V: de::Deserialize<'de>, + { + fn deserialize<D>(deserializer: D) -> Result<MyMap<K, V>, D::Error> + where + D: de::Deserializer<'de>, + { + deserializer.deserialize_map(Visitor { + marker: PhantomData, + }) + } + } + + let mut map = BTreeMap::new(); + map.insert("a", MyMap(BTreeMap::new())); + map.insert("b", MyMap(BTreeMap::new())); + let map: MyMap<_, MyMap<u32, u32>> = MyMap(map); + + test_encode_ok(&[(map.clone(), "{\"a\":{},\"b\":{}}")]); + + let s = to_string_pretty(&map).unwrap(); + let expected = pretty_str!({ + "a": {}, + "b": {} + }); + assert_eq!(s, expected); +} + +#[cfg(not(miri))] +#[test] +fn test_deserialize_from_stream() { + use serde_json::to_writer; + use std::net::{TcpListener, TcpStream}; + use std::thread; + + #[derive(Debug, PartialEq, Serialize, Deserialize)] + struct Message { + message: String, + } + + let l = TcpListener::bind("localhost:20000").unwrap(); + + thread::spawn(|| { + let l = l; + for stream in l.incoming() { + let mut stream = stream.unwrap(); + let read_stream = stream.try_clone().unwrap(); + + let mut de = Deserializer::from_reader(read_stream); + let request = Message::deserialize(&mut de).unwrap(); + let response = Message { + message: request.message, + }; + to_writer(&mut stream, &response).unwrap(); + } + }); + + let mut stream = TcpStream::connect("localhost:20000").unwrap(); + let request = Message { + message: "hi there".to_string(), + }; + to_writer(&mut stream, &request).unwrap(); + + let mut de = Deserializer::from_reader(stream); + let response = Message::deserialize(&mut de).unwrap(); + + assert_eq!(request, response); +} + +#[test] +fn test_serialize_rejects_bool_keys() { + let map = treemap!( + true => 2, + false => 4 + ); + + let err = to_vec(&map).unwrap_err(); + assert_eq!(err.to_string(), "key must be a string"); +} + +#[test] +fn test_serialize_rejects_adt_keys() { + let map = treemap!( + Some("a") => 2, + Some("b") => 4, + None => 6 + ); + + let err = to_vec(&map).unwrap_err(); + assert_eq!(err.to_string(), "key must be a string"); +} + +#[test] +fn test_bytes_ser() { + let buf = vec![]; + let bytes = Bytes::new(&buf); + assert_eq!(to_string(&bytes).unwrap(), "[]".to_string()); + + let buf = vec![1, 2, 3]; + let bytes = Bytes::new(&buf); + assert_eq!(to_string(&bytes).unwrap(), "[1,2,3]".to_string()); +} + +#[test] +fn test_byte_buf_ser() { + let bytes = ByteBuf::new(); + assert_eq!(to_string(&bytes).unwrap(), "[]".to_string()); + + let bytes = ByteBuf::from(vec![1, 2, 3]); + assert_eq!(to_string(&bytes).unwrap(), "[1,2,3]".to_string()); +} + +#[test] +fn test_byte_buf_de() { + let bytes = ByteBuf::new(); + let v: ByteBuf = from_str("[]").unwrap(); + assert_eq!(v, bytes); + + let bytes = ByteBuf::from(vec![1, 2, 3]); + let v: ByteBuf = from_str("[1, 2, 3]").unwrap(); + assert_eq!(v, bytes); +} + +#[test] +fn test_byte_buf_de_lone_surrogate() { + let bytes = ByteBuf::from(vec![237, 160, 188]); + let v: ByteBuf = from_str(r#""\ud83c""#).unwrap(); + assert_eq!(v, bytes); + + let bytes = ByteBuf::from(vec![237, 160, 188, 10]); + let v: ByteBuf = from_str(r#""\ud83c\n""#).unwrap(); + assert_eq!(v, bytes); + + let bytes = ByteBuf::from(vec![237, 160, 188, 32]); + let v: ByteBuf = from_str(r#""\ud83c ""#).unwrap(); + assert_eq!(v, bytes); + + let bytes = ByteBuf::from(vec![237, 176, 129]); + let v: ByteBuf = from_str(r#""\udc01""#).unwrap(); + assert_eq!(v, bytes); + + let res = from_str::<ByteBuf>(r#""\ud83c\!""#); + assert!(res.is_err()); + + let res = from_str::<ByteBuf>(r#""\ud83c\u""#); + assert!(res.is_err()); + + let res = from_str::<ByteBuf>(r#""\ud83c\ud83c""#); + assert!(res.is_err()); +} + +#[cfg(feature = "raw_value")] +#[test] +fn test_raw_de_lone_surrogate() { + use serde_json::value::RawValue; + + assert!(from_str::<Box<RawValue>>(r#""\ud83c""#).is_ok()); + assert!(from_str::<Box<RawValue>>(r#""\ud83c\n""#).is_ok()); + assert!(from_str::<Box<RawValue>>(r#""\ud83c ""#).is_ok()); + assert!(from_str::<Box<RawValue>>(r#""\udc01 ""#).is_ok()); + assert!(from_str::<Box<RawValue>>(r#""\udc01\!""#).is_err()); + assert!(from_str::<Box<RawValue>>(r#""\udc01\u""#).is_err()); + assert!(from_str::<Box<RawValue>>(r#""\ud83c\ud83c""#).is_ok()); +} + +#[test] +fn test_byte_buf_de_multiple() { + let s: Vec<ByteBuf> = from_str(r#"["ab\nc", "cd\ne"]"#).unwrap(); + let a = ByteBuf::from(b"ab\nc".to_vec()); + let b = ByteBuf::from(b"cd\ne".to_vec()); + assert_eq!(vec![a, b], s); +} + +#[test] +fn test_json_pointer() { + // Test case taken from https://tools.ietf.org/html/rfc6901#page-5 + let data: Value = from_str( + r#"{ + "foo": ["bar", "baz"], + "": 0, + "a/b": 1, + "c%d": 2, + "e^f": 3, + "g|h": 4, + "i\\j": 5, + "k\"l": 6, + " ": 7, + "m~n": 8 + }"#, + ) + .unwrap(); + assert_eq!(data.pointer("").unwrap(), &data); + assert_eq!(data.pointer("/foo").unwrap(), &json!(["bar", "baz"])); + assert_eq!(data.pointer("/foo/0").unwrap(), &json!("bar")); + assert_eq!(data.pointer("/").unwrap(), &json!(0)); + assert_eq!(data.pointer("/a~1b").unwrap(), &json!(1)); + assert_eq!(data.pointer("/c%d").unwrap(), &json!(2)); + assert_eq!(data.pointer("/e^f").unwrap(), &json!(3)); + assert_eq!(data.pointer("/g|h").unwrap(), &json!(4)); + assert_eq!(data.pointer("/i\\j").unwrap(), &json!(5)); + assert_eq!(data.pointer("/k\"l").unwrap(), &json!(6)); + assert_eq!(data.pointer("/ ").unwrap(), &json!(7)); + assert_eq!(data.pointer("/m~0n").unwrap(), &json!(8)); + // Invalid pointers + assert!(data.pointer("/unknown").is_none()); + assert!(data.pointer("/e^f/ertz").is_none()); + assert!(data.pointer("/foo/00").is_none()); + assert!(data.pointer("/foo/01").is_none()); +} + +#[test] +fn test_json_pointer_mut() { + // Test case taken from https://tools.ietf.org/html/rfc6901#page-5 + let mut data: Value = from_str( + r#"{ + "foo": ["bar", "baz"], + "": 0, + "a/b": 1, + "c%d": 2, + "e^f": 3, + "g|h": 4, + "i\\j": 5, + "k\"l": 6, + " ": 7, + "m~n": 8 + }"#, + ) + .unwrap(); + + // Basic pointer checks + assert_eq!(data.pointer_mut("/foo").unwrap(), &json!(["bar", "baz"])); + assert_eq!(data.pointer_mut("/foo/0").unwrap(), &json!("bar")); + assert_eq!(data.pointer_mut("/").unwrap(), 0); + assert_eq!(data.pointer_mut("/a~1b").unwrap(), 1); + assert_eq!(data.pointer_mut("/c%d").unwrap(), 2); + assert_eq!(data.pointer_mut("/e^f").unwrap(), 3); + assert_eq!(data.pointer_mut("/g|h").unwrap(), 4); + assert_eq!(data.pointer_mut("/i\\j").unwrap(), 5); + assert_eq!(data.pointer_mut("/k\"l").unwrap(), 6); + assert_eq!(data.pointer_mut("/ ").unwrap(), 7); + assert_eq!(data.pointer_mut("/m~0n").unwrap(), 8); + + // Invalid pointers + assert!(data.pointer_mut("/unknown").is_none()); + assert!(data.pointer_mut("/e^f/ertz").is_none()); + assert!(data.pointer_mut("/foo/00").is_none()); + assert!(data.pointer_mut("/foo/01").is_none()); + + // Mutable pointer checks + *data.pointer_mut("/").unwrap() = 100.into(); + assert_eq!(data.pointer("/").unwrap(), 100); + *data.pointer_mut("/foo/0").unwrap() = json!("buzz"); + assert_eq!(data.pointer("/foo/0").unwrap(), &json!("buzz")); + + // Example of ownership stealing + assert_eq!( + data.pointer_mut("/a~1b") + .map(|m| mem::replace(m, json!(null))) + .unwrap(), + 1 + ); + assert_eq!(data.pointer("/a~1b").unwrap(), &json!(null)); + + // Need to compare against a clone so we don't anger the borrow checker + // by taking out two references to a mutable value + let mut d2 = data.clone(); + assert_eq!(data.pointer_mut("").unwrap(), &mut d2); +} + +#[test] +fn test_stack_overflow() { + let brackets: String = iter::repeat('[') + .take(127) + .chain(iter::repeat(']').take(127)) + .collect(); + let _: Value = from_str(&brackets).unwrap(); + + let brackets = "[".repeat(129); + test_parse_err::<Value>(&[(&brackets, "recursion limit exceeded at line 1 column 128")]); +} + +#[test] +#[cfg(feature = "unbounded_depth")] +fn test_disable_recursion_limit() { + let brackets: String = iter::repeat('[') + .take(140) + .chain(iter::repeat(']').take(140)) + .collect(); + + let mut deserializer = Deserializer::from_str(&brackets); + deserializer.disable_recursion_limit(); + Value::deserialize(&mut deserializer).unwrap(); +} + +#[test] +fn test_integer_key() { + // map with integer keys + let map = treemap!( + 1 => 2, + -1 => 6 + ); + let j = r#"{"-1":6,"1":2}"#; + test_encode_ok(&[(&map, j)]); + test_parse_ok(vec![(j, map)]); + + let j = r#"{"x":null}"#; + test_parse_err::<BTreeMap<i32, ()>>(&[( + j, + "invalid type: string \"x\", expected i32 at line 1 column 4", + )]); +} + +#[test] +fn test_integer128_key() { + let map = treemap! { + 100000000000000000000000000000000000000u128 => () + }; + let j = r#"{"100000000000000000000000000000000000000":null}"#; + assert_eq!(to_string(&map).unwrap(), j); + assert_eq!(from_str::<BTreeMap<u128, ()>>(j).unwrap(), map); +} + +#[test] +fn test_deny_float_key() { + #[derive(Eq, PartialEq, Ord, PartialOrd)] + struct Float; + impl Serialize for Float { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: Serializer, + { + serializer.serialize_f32(1.0) + } + } + + // map with float key + let map = treemap!(Float => "x"); + assert!(serde_json::to_value(&map).is_err()); +} + +#[test] +fn test_borrowed_key() { + let map: BTreeMap<&str, ()> = from_str("{\"borrowed\":null}").unwrap(); + let expected = treemap! { "borrowed" => () }; + assert_eq!(map, expected); + + #[derive(Deserialize, Debug, Ord, PartialOrd, Eq, PartialEq)] + struct NewtypeStr<'a>(&'a str); + + let map: BTreeMap<NewtypeStr, ()> = from_str("{\"borrowed\":null}").unwrap(); + let expected = treemap! { NewtypeStr("borrowed") => () }; + assert_eq!(map, expected); +} + +#[test] +fn test_effectively_string_keys() { + #[derive(Eq, PartialEq, Ord, PartialOrd, Debug, Clone, Serialize, Deserialize)] + enum Enum { + One, + Two, + } + let map = treemap! { + Enum::One => 1, + Enum::Two => 2 + }; + let expected = r#"{"One":1,"Two":2}"#; + test_encode_ok(&[(&map, expected)]); + test_parse_ok(vec![(expected, map)]); + + #[derive(Eq, PartialEq, Ord, PartialOrd, Debug, Clone, Serialize, Deserialize)] + struct Wrapper(String); + let map = treemap! { + Wrapper("zero".to_owned()) => 0, + Wrapper("one".to_owned()) => 1 + }; + let expected = r#"{"one":1,"zero":0}"#; + test_encode_ok(&[(&map, expected)]); + test_parse_ok(vec![(expected, map)]); +} + +#[test] +fn test_json_macro() { + // This is tricky because the <...> is not a single TT and the comma inside + // looks like an array element separator. + let _ = json!([ + <Result<(), ()> as Clone>::clone(&Ok(())), + <Result<(), ()> as Clone>::clone(&Err(())) + ]); + + // Same thing but in the map values. + let _ = json!({ + "ok": <Result<(), ()> as Clone>::clone(&Ok(())), + "err": <Result<(), ()> as Clone>::clone(&Err(())) + }); + + // It works in map keys but only if they are parenthesized. + let _ = json!({ + (<Result<&str, ()> as Clone>::clone(&Ok("")).unwrap()): "ok", + (<Result<(), &str> as Clone>::clone(&Err("")).unwrap_err()): "err" + }); + + #[deny(unused_results)] + let _ = json!({ "architecture": [true, null] }); +} + +#[test] +fn issue_220() { + #[derive(Debug, PartialEq, Eq, Deserialize)] + enum E { + V(u8), + } + + assert!(from_str::<E>(r#" "V"0 "#).is_err()); + + assert_eq!(from_str::<E>(r#"{"V": 0}"#).unwrap(), E::V(0)); +} + +macro_rules! number_partialeq_ok { + ($($n:expr)*) => { + $( + let value = to_value($n).unwrap(); + let s = $n.to_string(); + assert_eq!(value, $n); + assert_eq!($n, value); + assert_ne!(value, s); + )* + } +} + +#[test] +fn test_partialeq_number() { + number_partialeq_ok!(0 1 100 + i8::MIN i8::MAX i16::MIN i16::MAX i32::MIN i32::MAX i64::MIN i64::MAX + u8::MIN u8::MAX u16::MIN u16::MAX u32::MIN u32::MAX u64::MIN u64::MAX + f32::MIN f32::MAX f32::MIN_EXP f32::MAX_EXP f32::MIN_POSITIVE + f64::MIN f64::MAX f64::MIN_EXP f64::MAX_EXP f64::MIN_POSITIVE + f32::consts::E f32::consts::PI f32::consts::LN_2 f32::consts::LOG2_E + f64::consts::E f64::consts::PI f64::consts::LN_2 f64::consts::LOG2_E + ); +} + +#[test] +#[cfg(integer128)] +#[cfg(feature = "arbitrary_precision")] +fn test_partialeq_integer128() { + number_partialeq_ok!(i128::MIN i128::MAX u128::MIN u128::MAX) +} + +#[test] +fn test_partialeq_string() { + let v = to_value("42").unwrap(); + assert_eq!(v, "42"); + assert_eq!("42", v); + assert_ne!(v, 42); + assert_eq!(v, String::from("42")); + assert_eq!(String::from("42"), v); +} + +#[test] +fn test_partialeq_bool() { + let v = to_value(true).unwrap(); + assert_eq!(v, true); + assert_eq!(true, v); + assert_ne!(v, false); + assert_ne!(v, "true"); + assert_ne!(v, 1); + assert_ne!(v, 0); +} + +struct FailReader(io::ErrorKind); + +impl io::Read for FailReader { + fn read(&mut self, _: &mut [u8]) -> io::Result<usize> { + Err(io::Error::new(self.0, "oh no!")) + } +} + +#[test] +fn test_category() { + assert!(from_str::<String>("123").unwrap_err().is_data()); + + assert!(from_str::<String>("]").unwrap_err().is_syntax()); + + assert!(from_str::<String>("").unwrap_err().is_eof()); + assert!(from_str::<String>("\"").unwrap_err().is_eof()); + assert!(from_str::<String>("\"\\").unwrap_err().is_eof()); + assert!(from_str::<String>("\"\\u").unwrap_err().is_eof()); + assert!(from_str::<String>("\"\\u0").unwrap_err().is_eof()); + assert!(from_str::<String>("\"\\u00").unwrap_err().is_eof()); + assert!(from_str::<String>("\"\\u000").unwrap_err().is_eof()); + + assert!(from_str::<Vec<usize>>("[").unwrap_err().is_eof()); + assert!(from_str::<Vec<usize>>("[0").unwrap_err().is_eof()); + assert!(from_str::<Vec<usize>>("[0,").unwrap_err().is_eof()); + + assert!(from_str::<BTreeMap<String, usize>>("{") + .unwrap_err() + .is_eof()); + assert!(from_str::<BTreeMap<String, usize>>("{\"k\"") + .unwrap_err() + .is_eof()); + assert!(from_str::<BTreeMap<String, usize>>("{\"k\":") + .unwrap_err() + .is_eof()); + assert!(from_str::<BTreeMap<String, usize>>("{\"k\":0") + .unwrap_err() + .is_eof()); + assert!(from_str::<BTreeMap<String, usize>>("{\"k\":0,") + .unwrap_err() + .is_eof()); + + let fail = FailReader(io::ErrorKind::NotConnected); + assert!(from_reader::<_, String>(fail).unwrap_err().is_io()); +} + +#[test] +// Clippy false positive: https://github.com/Manishearth/rust-clippy/issues/292 +#[allow(clippy::needless_lifetimes)] +fn test_into_io_error() { + fn io_error<'de, T: Deserialize<'de> + Debug>(j: &'static str) -> io::Error { + from_str::<T>(j).unwrap_err().into() + } + + assert_eq!( + io_error::<String>("\"\\u").kind(), + io::ErrorKind::UnexpectedEof + ); + assert_eq!(io_error::<String>("0").kind(), io::ErrorKind::InvalidData); + assert_eq!(io_error::<String>("]").kind(), io::ErrorKind::InvalidData); + + let fail = FailReader(io::ErrorKind::NotConnected); + let io_err: io::Error = from_reader::<_, u8>(fail).unwrap_err().into(); + assert_eq!(io_err.kind(), io::ErrorKind::NotConnected); +} + +#[test] +fn test_borrow() { + let s: &str = from_str("\"borrowed\"").unwrap(); + assert_eq!("borrowed", s); + + let s: &str = from_slice(b"\"borrowed\"").unwrap(); + assert_eq!("borrowed", s); +} + +#[test] +fn null_invalid_type() { + let err = serde_json::from_str::<String>("null").unwrap_err(); + assert_eq!( + format!("{}", err), + String::from("invalid type: null, expected a string at line 1 column 4") + ); +} + +#[test] +fn test_integer128() { + let signed = &[i128::min_value(), -1, 0, 1, i128::max_value()]; + let unsigned = &[0, 1, u128::max_value()]; + + for integer128 in signed { + let expected = integer128.to_string(); + assert_eq!(to_string(integer128).unwrap(), expected); + assert_eq!(from_str::<i128>(&expected).unwrap(), *integer128); + } + + for integer128 in unsigned { + let expected = integer128.to_string(); + assert_eq!(to_string(integer128).unwrap(), expected); + assert_eq!(from_str::<u128>(&expected).unwrap(), *integer128); + } + + test_parse_err::<i128>(&[ + ( + "-170141183460469231731687303715884105729", + "number out of range at line 1 column 40", + ), + ( + "170141183460469231731687303715884105728", + "number out of range at line 1 column 39", + ), + ]); + + test_parse_err::<u128>(&[ + ("-1", "number out of range at line 1 column 1"), + ( + "340282366920938463463374607431768211456", + "number out of range at line 1 column 39", + ), + ]); +} + +#[cfg(feature = "raw_value")] +#[test] +fn test_borrowed_raw_value() { + #[derive(Serialize, Deserialize)] + struct Wrapper<'a> { + a: i8, + #[serde(borrow)] + b: &'a RawValue, + c: i8, + } + + let wrapper_from_str: Wrapper = + serde_json::from_str(r#"{"a": 1, "b": {"foo": 2}, "c": 3}"#).unwrap(); + assert_eq!(r#"{"foo": 2}"#, wrapper_from_str.b.get()); + + let wrapper_to_string = serde_json::to_string(&wrapper_from_str).unwrap(); + assert_eq!(r#"{"a":1,"b":{"foo": 2},"c":3}"#, wrapper_to_string); + + let wrapper_to_value = serde_json::to_value(&wrapper_from_str).unwrap(); + assert_eq!(json!({"a": 1, "b": {"foo": 2}, "c": 3}), wrapper_to_value); + + let array_from_str: Vec<&RawValue> = + serde_json::from_str(r#"["a", 42, {"foo": "bar"}, null]"#).unwrap(); + assert_eq!(r#""a""#, array_from_str[0].get()); + assert_eq!(r#"42"#, array_from_str[1].get()); + assert_eq!(r#"{"foo": "bar"}"#, array_from_str[2].get()); + assert_eq!(r#"null"#, array_from_str[3].get()); + + let array_to_string = serde_json::to_string(&array_from_str).unwrap(); + assert_eq!(r#"["a",42,{"foo": "bar"},null]"#, array_to_string); +} + +#[cfg(feature = "raw_value")] +#[test] +fn test_raw_value_in_map_key() { + #[derive(RefCast)] + #[repr(transparent)] + struct RawMapKey(RawValue); + + impl<'de> Deserialize<'de> for &'de RawMapKey { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: serde::Deserializer<'de>, + { + let raw_value = <&RawValue>::deserialize(deserializer)?; + Ok(RawMapKey::ref_cast(raw_value)) + } + } + + impl PartialEq for RawMapKey { + fn eq(&self, other: &Self) -> bool { + self.0.get() == other.0.get() + } + } + + impl Eq for RawMapKey {} + + impl Hash for RawMapKey { + fn hash<H: Hasher>(&self, hasher: &mut H) { + self.0.get().hash(hasher); + } + } + + let map_from_str: HashMap<&RawMapKey, &RawValue> = + serde_json::from_str(r#" {"\\k":"\\v"} "#).unwrap(); + let (map_k, map_v) = map_from_str.into_iter().next().unwrap(); + assert_eq!("\"\\\\k\"", map_k.0.get()); + assert_eq!("\"\\\\v\"", map_v.get()); +} + +#[cfg(feature = "raw_value")] +#[test] +fn test_boxed_raw_value() { + #[derive(Serialize, Deserialize)] + struct Wrapper { + a: i8, + b: Box<RawValue>, + c: i8, + } + + let wrapper_from_str: Wrapper = + serde_json::from_str(r#"{"a": 1, "b": {"foo": 2}, "c": 3}"#).unwrap(); + assert_eq!(r#"{"foo": 2}"#, wrapper_from_str.b.get()); + + let wrapper_from_reader: Wrapper = + serde_json::from_reader(br#"{"a": 1, "b": {"foo": 2}, "c": 3}"#.as_ref()).unwrap(); + assert_eq!(r#"{"foo": 2}"#, wrapper_from_reader.b.get()); + + let wrapper_from_value: Wrapper = + serde_json::from_value(json!({"a": 1, "b": {"foo": 2}, "c": 3})).unwrap(); + assert_eq!(r#"{"foo":2}"#, wrapper_from_value.b.get()); + + let wrapper_to_string = serde_json::to_string(&wrapper_from_str).unwrap(); + assert_eq!(r#"{"a":1,"b":{"foo": 2},"c":3}"#, wrapper_to_string); + + let wrapper_to_value = serde_json::to_value(&wrapper_from_str).unwrap(); + assert_eq!(json!({"a": 1, "b": {"foo": 2}, "c": 3}), wrapper_to_value); + + let array_from_str: Vec<Box<RawValue>> = + serde_json::from_str(r#"["a", 42, {"foo": "bar"}, null]"#).unwrap(); + assert_eq!(r#""a""#, array_from_str[0].get()); + assert_eq!(r#"42"#, array_from_str[1].get()); + assert_eq!(r#"{"foo": "bar"}"#, array_from_str[2].get()); + assert_eq!(r#"null"#, array_from_str[3].get()); + + let array_from_reader: Vec<Box<RawValue>> = + serde_json::from_reader(br#"["a", 42, {"foo": "bar"}, null]"#.as_ref()).unwrap(); + assert_eq!(r#""a""#, array_from_reader[0].get()); + assert_eq!(r#"42"#, array_from_reader[1].get()); + assert_eq!(r#"{"foo": "bar"}"#, array_from_reader[2].get()); + assert_eq!(r#"null"#, array_from_reader[3].get()); + + let array_to_string = serde_json::to_string(&array_from_str).unwrap(); + assert_eq!(r#"["a",42,{"foo": "bar"},null]"#, array_to_string); +} + +#[cfg(feature = "raw_value")] +#[test] +fn test_raw_invalid_utf8() { + let j = &[b'"', b'\xCE', b'\xF8', b'"']; + let value_err = serde_json::from_slice::<Value>(j).unwrap_err(); + let raw_value_err = serde_json::from_slice::<Box<RawValue>>(j).unwrap_err(); + + assert_eq!( + value_err.to_string(), + "invalid unicode code point at line 1 column 4", + ); + assert_eq!( + raw_value_err.to_string(), + "invalid unicode code point at line 1 column 4", + ); +} + +#[cfg(feature = "raw_value")] +#[test] +fn test_serialize_unsized_value_to_raw_value() { + assert_eq!( + serde_json::value::to_raw_value("foobar").unwrap().get(), + r#""foobar""#, + ); +} + +#[test] +fn test_borrow_in_map_key() { + #[derive(Deserialize, Debug)] + struct Outer { + #[allow(dead_code)] + map: BTreeMap<MyMapKey, ()>, + } + + #[derive(Ord, PartialOrd, Eq, PartialEq, Debug)] + struct MyMapKey(usize); + + impl<'de> Deserialize<'de> for MyMapKey { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: de::Deserializer<'de>, + { + let s = <&str>::deserialize(deserializer)?; + let n = s.parse().map_err(de::Error::custom)?; + Ok(MyMapKey(n)) + } + } + + let value = json!({ "map": { "1": null } }); + Outer::deserialize(&value).unwrap(); +} + +#[test] +fn test_value_into_deserializer() { + #[derive(Deserialize)] + struct Outer { + inner: Inner, + } + + #[derive(Deserialize)] + struct Inner { + string: String, + } + + let mut map = BTreeMap::new(); + map.insert("inner", json!({ "string": "Hello World" })); + + let outer = Outer::deserialize(map.into_deserializer()).unwrap(); + assert_eq!(outer.inner.string, "Hello World"); +} + +#[test] +fn hash_positive_and_negative_zero() { + fn hash(obj: impl Hash) -> u64 { + let mut hasher = DefaultHasher::new(); + obj.hash(&mut hasher); + hasher.finish() + } + + let k1 = serde_json::from_str::<Number>("0.0").unwrap(); + let k2 = serde_json::from_str::<Number>("-0.0").unwrap(); + if cfg!(feature = "arbitrary_precision") { + assert_ne!(k1, k2); + assert_ne!(hash(k1), hash(k2)); + } else { + assert_eq!(k1, k2); + assert_eq!(hash(k1), hash(k2)); + } +} diff --git a/vendor/serde_json/tests/ui/missing_colon.rs b/vendor/serde_json/tests/ui/missing_colon.rs new file mode 100644 index 000000000..d93b7b907 --- /dev/null +++ b/vendor/serde_json/tests/ui/missing_colon.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "a" }); +} diff --git a/vendor/serde_json/tests/ui/missing_colon.stderr b/vendor/serde_json/tests/ui/missing_colon.stderr new file mode 100644 index 000000000..9b83c1777 --- /dev/null +++ b/vendor/serde_json/tests/ui/missing_colon.stderr @@ -0,0 +1,7 @@ +error: unexpected end of macro invocation + --> tests/ui/missing_colon.rs:4:5 + | +4 | json!({ "a" }); + | ^^^^^^^^^^^^^^ missing tokens in macro arguments + | + = note: this error originates in the macro `json_internal` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/vendor/serde_json/tests/ui/missing_comma.rs b/vendor/serde_json/tests/ui/missing_comma.rs new file mode 100644 index 000000000..8818c3e60 --- /dev/null +++ b/vendor/serde_json/tests/ui/missing_comma.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "1": "" "2": "" }); +} diff --git a/vendor/serde_json/tests/ui/missing_comma.stderr b/vendor/serde_json/tests/ui/missing_comma.stderr new file mode 100644 index 000000000..bd911d035 --- /dev/null +++ b/vendor/serde_json/tests/ui/missing_comma.stderr @@ -0,0 +1,7 @@ +error: no rules expected the token `"2"` + --> tests/ui/missing_comma.rs:4:21 + | +4 | json!({ "1": "" "2": "" }); + | -^^^ no rules expected this token in macro call + | | + | help: missing comma here diff --git a/vendor/serde_json/tests/ui/missing_value.rs b/vendor/serde_json/tests/ui/missing_value.rs new file mode 100644 index 000000000..0ba14e22c --- /dev/null +++ b/vendor/serde_json/tests/ui/missing_value.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "a" : }); +} diff --git a/vendor/serde_json/tests/ui/missing_value.stderr b/vendor/serde_json/tests/ui/missing_value.stderr new file mode 100644 index 000000000..d538d9613 --- /dev/null +++ b/vendor/serde_json/tests/ui/missing_value.stderr @@ -0,0 +1,7 @@ +error: unexpected end of macro invocation + --> tests/ui/missing_value.rs:4:5 + | +4 | json!({ "a" : }); + | ^^^^^^^^^^^^^^^^ missing tokens in macro arguments + | + = note: this error originates in the macro `json_internal` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/vendor/serde_json/tests/ui/not_found.rs b/vendor/serde_json/tests/ui/not_found.rs new file mode 100644 index 000000000..2df6870dc --- /dev/null +++ b/vendor/serde_json/tests/ui/not_found.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "a" : x }); +} diff --git a/vendor/serde_json/tests/ui/not_found.stderr b/vendor/serde_json/tests/ui/not_found.stderr new file mode 100644 index 000000000..6fec18040 --- /dev/null +++ b/vendor/serde_json/tests/ui/not_found.stderr @@ -0,0 +1,5 @@ +error[E0425]: cannot find value `x` in this scope + --> tests/ui/not_found.rs:4:19 + | +4 | json!({ "a" : x }); + | ^ not found in this scope diff --git a/vendor/serde_json/tests/ui/parse_expr.rs b/vendor/serde_json/tests/ui/parse_expr.rs new file mode 100644 index 000000000..e7f1805b1 --- /dev/null +++ b/vendor/serde_json/tests/ui/parse_expr.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "a" : ~ }); +} diff --git a/vendor/serde_json/tests/ui/parse_expr.stderr b/vendor/serde_json/tests/ui/parse_expr.stderr new file mode 100644 index 000000000..6959673d9 --- /dev/null +++ b/vendor/serde_json/tests/ui/parse_expr.stderr @@ -0,0 +1,5 @@ +error: no rules expected the token `~` + --> tests/ui/parse_expr.rs:4:19 + | +4 | json!({ "a" : ~ }); + | ^ no rules expected this token in macro call diff --git a/vendor/serde_json/tests/ui/parse_key.rs b/vendor/serde_json/tests/ui/parse_key.rs new file mode 100644 index 000000000..858bd7169 --- /dev/null +++ b/vendor/serde_json/tests/ui/parse_key.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "".s : true }); +} diff --git a/vendor/serde_json/tests/ui/parse_key.stderr b/vendor/serde_json/tests/ui/parse_key.stderr new file mode 100644 index 000000000..f10c21800 --- /dev/null +++ b/vendor/serde_json/tests/ui/parse_key.stderr @@ -0,0 +1,5 @@ +error[E0609]: no field `s` on type `&'static str` + --> tests/ui/parse_key.rs:4:16 + | +4 | json!({ "".s : true }); + | ^ diff --git a/vendor/serde_json/tests/ui/unexpected_after_array_element.rs b/vendor/serde_json/tests/ui/unexpected_after_array_element.rs new file mode 100644 index 000000000..226c58cf1 --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_after_array_element.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!([ true => ]); +} diff --git a/vendor/serde_json/tests/ui/unexpected_after_array_element.stderr b/vendor/serde_json/tests/ui/unexpected_after_array_element.stderr new file mode 100644 index 000000000..f745a212d --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_after_array_element.stderr @@ -0,0 +1,5 @@ +error: no rules expected the token `=>` + --> tests/ui/unexpected_after_array_element.rs:4:18 + | +4 | json!([ true => ]); + | ^^ no rules expected this token in macro call diff --git a/vendor/serde_json/tests/ui/unexpected_after_map_entry.rs b/vendor/serde_json/tests/ui/unexpected_after_map_entry.rs new file mode 100644 index 000000000..0dfb73155 --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_after_map_entry.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "k": true => }); +} diff --git a/vendor/serde_json/tests/ui/unexpected_after_map_entry.stderr b/vendor/serde_json/tests/ui/unexpected_after_map_entry.stderr new file mode 100644 index 000000000..a18c9b4cd --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_after_map_entry.stderr @@ -0,0 +1,5 @@ +error: no rules expected the token `=>` + --> tests/ui/unexpected_after_map_entry.rs:4:23 + | +4 | json!({ "k": true => }); + | ^^ no rules expected this token in macro call diff --git a/vendor/serde_json/tests/ui/unexpected_colon.rs b/vendor/serde_json/tests/ui/unexpected_colon.rs new file mode 100644 index 000000000..e767ea6f7 --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_colon.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ : true }); +} diff --git a/vendor/serde_json/tests/ui/unexpected_colon.stderr b/vendor/serde_json/tests/ui/unexpected_colon.stderr new file mode 100644 index 000000000..ed038f608 --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_colon.stderr @@ -0,0 +1,5 @@ +error: no rules expected the token `:` + --> tests/ui/unexpected_colon.rs:4:13 + | +4 | json!({ : true }); + | ^ no rules expected this token in macro call diff --git a/vendor/serde_json/tests/ui/unexpected_comma.rs b/vendor/serde_json/tests/ui/unexpected_comma.rs new file mode 100644 index 000000000..338874ed8 --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_comma.rs @@ -0,0 +1,5 @@ +use serde_json::json; + +fn main() { + json!({ "a" , "b": true }); +} diff --git a/vendor/serde_json/tests/ui/unexpected_comma.stderr b/vendor/serde_json/tests/ui/unexpected_comma.stderr new file mode 100644 index 000000000..a4309c4e5 --- /dev/null +++ b/vendor/serde_json/tests/ui/unexpected_comma.stderr @@ -0,0 +1,5 @@ +error: no rules expected the token `,` + --> tests/ui/unexpected_comma.rs:4:17 + | +4 | json!({ "a" , "b": true }); + | ^ no rules expected this token in macro call diff --git a/vendor/serde_repr/.cargo-checksum.json b/vendor/serde_repr/.cargo-checksum.json new file mode 100644 index 000000000..4012e22d8 --- /dev/null +++ b/vendor/serde_repr/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"99cae9ec2495b733e77b78630bc8cfc312afac866b84c71618d896a7c90e555d","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"18848980d7a8fc120c0c03fbf02a79ea7cd9e6f446f4c76aad48782c76967634","src/lib.rs":"6991484c16826a6b5bf50924448d5b1a858e832f64770c95bd2ac24a757e632a","src/parse.rs":"687cf1436d12c0c26b1c6d06f80e56b4ec0d63a38d71e1f175b981c0fdc10c68","tests/compiletest.rs":"022a8e400ef813d7ea1875b944549cee5125f6a995dc33e93b48cba3e1b57bd1","tests/test.rs":"a5c4df255ded38d91a3abb4b6c59fde6710a17b0832c8a5bba2a04b455a14bfa","tests/ui/empty_enum.rs":"fe1166f2f92ee213d26a23e57572a99c65c163d446fd8d67e1520bab34f4b859","tests/ui/empty_enum.stderr":"2c8907fc146bb4dcdb926b72de4f823dae4c1c0d8de8a636c512539408f26cc7","tests/ui/missing_repr.rs":"b7ba9341111582cad52e761b82f14778c60352014c4265566e4d4d01ccdcb306","tests/ui/missing_repr.stderr":"dfcb65527963fb8962e1442e10d3c71e141f238b1732483e1739b528ae0eca43","tests/ui/multiple_others.rs":"569658516619719f21e5071873a37125d5390edb77558e4381401f03efda0c83","tests/ui/multiple_others.stderr":"a300f94d2a2049d6718866d17b5673201edc275164b9e8eba25a9ffcd71fd30f","tests/ui/non_unit_variant.rs":"0d8295ae08d882fc3ef4164857240038c5b0674ff0811da9b6ea7343e8bb955c","tests/ui/non_unit_variant.stderr":"18f2900e501b8c64b980445758ca1cb59594dc8d24a1a76abb08a48d8beb3f35","tests/ui/not_enum.rs":"ada7637821c924a6b99175363c820375991be60223f96ca553d304fde2721386","tests/ui/not_enum.stderr":"814525f9a1495225511a02ad4149c9371ea622230b8002564fe83cf52300c728"},"package":"a2ad84e47328a31223de7fed7a4f5087f2d6ddfe586cf3ca25b7a165bc0a5aed"}
\ No newline at end of file diff --git a/vendor/serde_repr/Cargo.toml b/vendor/serde_repr/Cargo.toml new file mode 100644 index 000000000..41cb6a15c --- /dev/null +++ b/vendor/serde_repr/Cargo.toml @@ -0,0 +1,50 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +rust-version = "1.31" +name = "serde_repr" +version = "0.1.8" +authors = ["David Tolnay <dtolnay@gmail.com>"] +description = "Derive Serialize and Deserialize that delegates to the underlying repr of a C-like enum." +documentation = "https://docs.rs/serde_repr" +readme = "README.md" +license = "MIT OR Apache-2.0" +repository = "https://github.com/dtolnay/serde-repr" + +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] + +[lib] +proc-macro = true + +[dependencies.proc-macro2] +version = "1.0" + +[dependencies.quote] +version = "1.0" + +[dependencies.syn] +version = "1.0" + +[dev-dependencies.rustversion] +version = "1.0" + +[dev-dependencies.serde] +version = "1.0" + +[dev-dependencies.serde_json] +version = "1.0" + +[dev-dependencies.trybuild] +version = "1.0.49" +features = ["diff"] diff --git a/vendor/serde_repr/LICENSE-APACHE b/vendor/serde_repr/LICENSE-APACHE new file mode 100644 index 000000000..16fe87b06 --- /dev/null +++ b/vendor/serde_repr/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + +Copyright [yyyy] [name of copyright owner] + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/vendor/serde_repr/LICENSE-MIT b/vendor/serde_repr/LICENSE-MIT new file mode 100644 index 000000000..31aa79387 --- /dev/null +++ b/vendor/serde_repr/LICENSE-MIT @@ -0,0 +1,23 @@ +Permission is hereby granted, free of charge, to any +person obtaining a copy of this software and associated +documentation files (the "Software"), to deal in the +Software without restriction, including without +limitation the rights to use, copy, modify, merge, +publish, distribute, sublicense, and/or sell copies of +the Software, and to permit persons to whom the Software +is furnished to do so, subject to the following +conditions: + +The above copyright notice and this permission notice +shall be included in all copies or substantial portions +of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF +ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED +TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A +PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/vendor/serde_repr/README.md b/vendor/serde_repr/README.md new file mode 100644 index 000000000..c87b3cedc --- /dev/null +++ b/vendor/serde_repr/README.md @@ -0,0 +1,57 @@ +Serde repr derive +================= + +[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/serde--repr-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/serde-repr) +[<img alt="crates.io" src="https://img.shields.io/crates/v/serde_repr.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/serde_repr) +[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-serde__repr-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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" height="20">](https://docs.rs/serde_repr) +[<img alt="build status" src="https://img.shields.io/github/workflow/status/dtolnay/serde-repr/CI/master?style=for-the-badge" height="20">](https://github.com/dtolnay/serde-repr/actions?query=branch%3Amaster) + +This crate provides a derive macro to derive Serde's `Serialize` and +`Deserialize` traits in a way that delegates to the underlying repr of a C-like +enum. + +```toml +[dependencies] +serde = "1.0" +serde_repr = "0.1" +``` + +```rust +use serde_repr::{Serialize_repr, Deserialize_repr}; + +#[derive(Serialize_repr, Deserialize_repr, PartialEq, Debug)] +#[repr(u8)] +enum SmallPrime { + Two = 2, + Three = 3, + Five = 5, + Seven = 7, +} + +fn main() -> serde_json::Result<()> { + let j = serde_json::to_string(&SmallPrime::Seven)?; + assert_eq!(j, "7"); + + let p: SmallPrime = serde_json::from_str("2")?; + assert_eq!(p, SmallPrime::Two); + + Ok(()) +} +``` + +<br> + +#### License + +<sup> +Licensed under either of <a href="LICENSE-APACHE">Apache License, Version +2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option. +</sup> + +<br> + +<sub> +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in this crate by you, as defined in the Apache-2.0 license, shall +be dual licensed as above, without any additional terms or conditions. +</sub> diff --git a/vendor/serde_repr/src/lib.rs b/vendor/serde_repr/src/lib.rs new file mode 100644 index 000000000..72e2c2bdd --- /dev/null +++ b/vendor/serde_repr/src/lib.rs @@ -0,0 +1,140 @@ +//! [![github]](https://github.com/dtolnay/serde-repr) [![crates-io]](https://crates.io/crates/serde_repr) [![docs-rs]](https://docs.rs/serde_repr) +//! +//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github +//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust +//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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 +//! +//! <br> +//! +//! Derive `Serialize` and `Deserialize` that delegates to the underlying repr +//! of a C-like enum. +//! +//! # Examples +//! +//! ``` +//! use serde_repr::{Serialize_repr, Deserialize_repr}; +//! +//! #[derive(Serialize_repr, Deserialize_repr, PartialEq, Debug)] +//! #[repr(u8)] +//! enum SmallPrime { +//! Two = 2, +//! Three = 3, +//! Five = 5, +//! Seven = 7, +//! } +//! +//! fn main() -> serde_json::Result<()> { +//! let j = serde_json::to_string(&SmallPrime::Seven)?; +//! assert_eq!(j, "7"); +//! +//! let p: SmallPrime = serde_json::from_str("2")?; +//! assert_eq!(p, SmallPrime::Two); +//! +//! Ok(()) +//! } +//! ``` + +#![allow(clippy::single_match_else)] + +extern crate proc_macro; + +mod parse; + +use proc_macro::TokenStream; +use quote::quote; +use syn::parse_macro_input; + +use crate::parse::Input; + +#[proc_macro_derive(Serialize_repr)] +pub fn derive_serialize(input: TokenStream) -> TokenStream { + let input = parse_macro_input!(input as Input); + let ident = input.ident; + let repr = input.repr; + + let match_variants = input.variants.iter().map(|variant| { + let variant = &variant.ident; + quote! { + #ident::#variant => #ident::#variant as #repr, + } + }); + + TokenStream::from(quote! { + impl serde::Serialize for #ident { + #[allow(clippy::use_self)] + fn serialize<S>(&self, serializer: S) -> core::result::Result<S::Ok, S::Error> + where + S: serde::Serializer + { + let value: #repr = match *self { + #(#match_variants)* + }; + serde::Serialize::serialize(&value, serializer) + } + } + }) +} + +#[proc_macro_derive(Deserialize_repr, attributes(serde))] +pub fn derive_deserialize(input: TokenStream) -> TokenStream { + let input = parse_macro_input!(input as Input); + let ident = input.ident; + let repr = input.repr; + let variants = input.variants.iter().map(|variant| &variant.ident); + + let declare_discriminants = input.variants.iter().map(|variant| { + let variant = &variant.ident; + quote! { + const #variant: #repr = #ident::#variant as #repr; + } + }); + + let match_discriminants = input.variants.iter().map(|variant| { + let variant = &variant.ident; + quote! { + discriminant::#variant => core::result::Result::Ok(#ident::#variant), + } + }); + + let error_format = match input.variants.len() { + 1 => "invalid value: {}, expected {}".to_owned(), + 2 => "invalid value: {}, expected {} or {}".to_owned(), + n => "invalid value: {}, expected one of: {}".to_owned() + &", {}".repeat(n - 1), + }; + + let other_arm = match input.default_variant { + Some(variant) => { + let variant = &variant.ident; + quote! { + core::result::Result::Ok(#ident::#variant) + } + } + None => quote! { + core::result::Result::Err(serde::de::Error::custom( + format_args!(#error_format, other #(, discriminant::#variants)*) + )) + }, + }; + + TokenStream::from(quote! { + impl<'de> serde::Deserialize<'de> for #ident { + #[allow(clippy::use_self)] + fn deserialize<D>(deserializer: D) -> core::result::Result<Self, D::Error> + where + D: serde::Deserializer<'de>, + { + struct discriminant; + + #[allow(non_upper_case_globals)] + impl discriminant { + #(#declare_discriminants)* + } + + match <#repr as serde::Deserialize>::deserialize(deserializer)? { + #(#match_discriminants)* + other => #other_arm, + } + } + } + }) +} diff --git a/vendor/serde_repr/src/parse.rs b/vendor/serde_repr/src/parse.rs new file mode 100644 index 000000000..2c0ad1e7d --- /dev/null +++ b/vendor/serde_repr/src/parse.rs @@ -0,0 +1,114 @@ +use proc_macro2::Span; +use syn::parse::{Error, Parse, ParseStream, Parser, Result}; +use syn::{parenthesized, Data, DeriveInput, Fields, Ident, Meta, NestedMeta}; + +pub struct Input { + pub ident: Ident, + pub repr: Ident, + pub variants: Vec<Variant>, + pub default_variant: Option<Variant>, +} + +#[derive(Clone)] +pub struct Variant { + pub ident: Ident, + pub attrs: VariantAttrs, +} + +#[derive(Clone)] +pub struct VariantAttrs { + pub is_default: bool, +} + +fn parse_meta(attrs: &mut VariantAttrs, meta: &Meta) { + if let Meta::List(value) = meta { + for meta in &value.nested { + if let NestedMeta::Meta(Meta::Path(path)) = meta { + if path.is_ident("other") { + attrs.is_default = true; + } + } + } + } +} + +fn parse_attrs(variant: &syn::Variant) -> Result<VariantAttrs> { + let mut attrs = VariantAttrs { is_default: false }; + for attr in &variant.attrs { + if attr.path.is_ident("serde") { + parse_meta(&mut attrs, &attr.parse_meta()?); + } + } + Ok(attrs) +} + +impl Parse for Input { + fn parse(input: ParseStream) -> Result<Self> { + let call_site = Span::call_site(); + let derive_input = DeriveInput::parse(input)?; + + let data = match derive_input.data { + Data::Enum(data) => data, + _ => { + return Err(Error::new(call_site, "input must be an enum")); + } + }; + + let variants = data + .variants + .into_iter() + .map(|variant| match variant.fields { + Fields::Unit => { + let attrs = parse_attrs(&variant)?; + Ok(Variant { + ident: variant.ident, + attrs, + }) + } + Fields::Named(_) | Fields::Unnamed(_) => { + Err(Error::new(variant.ident.span(), "must be a unit variant")) + } + }) + .collect::<Result<Vec<Variant>>>()?; + + if variants.is_empty() { + return Err(Error::new(call_site, "there must be at least one variant")); + } + + let generics = derive_input.generics; + if !generics.params.is_empty() || generics.where_clause.is_some() { + return Err(Error::new(call_site, "generic enum is not supported")); + } + + let mut repr = None; + for attr in derive_input.attrs { + if attr.path.is_ident("repr") { + fn repr_arg(input: ParseStream) -> Result<Ident> { + let content; + parenthesized!(content in input); + content.parse() + } + let ty = repr_arg.parse2(attr.tokens)?; + repr = Some(ty); + break; + } + } + let repr = repr.ok_or_else(|| Error::new(call_site, "missing #[repr(...)] attribute"))?; + + let mut default_variants = variants.iter().filter(|x| x.attrs.is_default); + let default_variant = default_variants.next().cloned(); + if default_variants.next().is_some() { + return Err(Error::new( + call_site, + "only one variant can be #[serde(other)]", + )); + } + + Ok(Input { + ident: derive_input.ident, + repr, + variants, + default_variant, + }) + } +} diff --git a/vendor/serde_repr/tests/compiletest.rs b/vendor/serde_repr/tests/compiletest.rs new file mode 100644 index 000000000..7974a6249 --- /dev/null +++ b/vendor/serde_repr/tests/compiletest.rs @@ -0,0 +1,7 @@ +#[rustversion::attr(not(nightly), ignore)] +#[cfg_attr(miri, ignore)] +#[test] +fn ui() { + let t = trybuild::TestCases::new(); + t.compile_fail("tests/ui/*.rs"); +} diff --git a/vendor/serde_repr/tests/test.rs b/vendor/serde_repr/tests/test.rs new file mode 100644 index 000000000..8c44827dd --- /dev/null +++ b/vendor/serde_repr/tests/test.rs @@ -0,0 +1,80 @@ +#![allow( + // Clippy bug: https://github.com/rust-lang/rust-clippy/issues/7422 + clippy::nonstandard_macro_braces, + clippy::wildcard_imports, +)] + +use serde_repr::{Deserialize_repr, Serialize_repr}; + +mod small_prime { + use super::*; + + #[derive(Serialize_repr, Deserialize_repr, PartialEq, Debug)] + #[repr(u8)] + enum SmallPrime { + Two = 2, + Three = 3, + Five = 5, + Seven = 7, + } + + #[test] + fn test_serialize() { + let j = serde_json::to_string(&SmallPrime::Seven).unwrap(); + assert_eq!(j, "7"); + } + + #[test] + fn test_deserialize() { + let p: SmallPrime = serde_json::from_str("2").unwrap(); + assert_eq!(p, SmallPrime::Two); + } +} + +mod other { + use super::*; + + #[derive(Serialize_repr, Deserialize_repr, PartialEq, Debug)] + #[repr(u8)] + enum TestOther { + A, + B, + #[serde(other, rename = "useless")] + Other, + } + + #[test] + fn test_deserialize() { + let p: TestOther = serde_json::from_str("0").unwrap(); + assert_eq!(p, TestOther::A); + let p: TestOther = serde_json::from_str("1").unwrap(); + assert_eq!(p, TestOther::B); + let p: TestOther = serde_json::from_str("5").unwrap(); + assert_eq!(p, TestOther::Other); + } +} + +mod implicit_discriminant { + use super::*; + + #[derive(Serialize_repr, Deserialize_repr, PartialEq, Debug)] + #[repr(u8)] + enum ImplicitDiscriminant { + Zero, + One, + Two, + Three, + } + + #[test] + fn test_serialize() { + let j = serde_json::to_string(&ImplicitDiscriminant::Three).unwrap(); + assert_eq!(j, "3"); + } + + #[test] + fn test_deserialize() { + let p: ImplicitDiscriminant = serde_json::from_str("2").unwrap(); + assert_eq!(p, ImplicitDiscriminant::Two); + } +} diff --git a/vendor/serde_repr/tests/ui/empty_enum.rs b/vendor/serde_repr/tests/ui/empty_enum.rs new file mode 100644 index 000000000..f1fb6f9d5 --- /dev/null +++ b/vendor/serde_repr/tests/ui/empty_enum.rs @@ -0,0 +1,6 @@ +use serde_repr::Serialize_repr; + +#[derive(Serialize_repr)] +enum SmallPrime {} + +fn main() {} diff --git a/vendor/serde_repr/tests/ui/empty_enum.stderr b/vendor/serde_repr/tests/ui/empty_enum.stderr new file mode 100644 index 000000000..d7c4de19b --- /dev/null +++ b/vendor/serde_repr/tests/ui/empty_enum.stderr @@ -0,0 +1,7 @@ +error: there must be at least one variant + --> tests/ui/empty_enum.rs:3:10 + | +3 | #[derive(Serialize_repr)] + | ^^^^^^^^^^^^^^ + | + = note: this error originates in the derive macro `Serialize_repr` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/vendor/serde_repr/tests/ui/missing_repr.rs b/vendor/serde_repr/tests/ui/missing_repr.rs new file mode 100644 index 000000000..00836356b --- /dev/null +++ b/vendor/serde_repr/tests/ui/missing_repr.rs @@ -0,0 +1,11 @@ +use serde_repr::Serialize_repr; + +#[derive(Serialize_repr)] +enum SmallPrime { + Two = 2, + Three = 3, + Five = 5, + Seven = 7, +} + +fn main() {} diff --git a/vendor/serde_repr/tests/ui/missing_repr.stderr b/vendor/serde_repr/tests/ui/missing_repr.stderr new file mode 100644 index 000000000..e011be6f1 --- /dev/null +++ b/vendor/serde_repr/tests/ui/missing_repr.stderr @@ -0,0 +1,7 @@ +error: missing #[repr(...)] attribute + --> tests/ui/missing_repr.rs:3:10 + | +3 | #[derive(Serialize_repr)] + | ^^^^^^^^^^^^^^ + | + = note: this error originates in the derive macro `Serialize_repr` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/vendor/serde_repr/tests/ui/multiple_others.rs b/vendor/serde_repr/tests/ui/multiple_others.rs new file mode 100644 index 000000000..fdb552b10 --- /dev/null +++ b/vendor/serde_repr/tests/ui/multiple_others.rs @@ -0,0 +1,12 @@ +use serde_repr::Deserialize_repr; + +#[derive(Deserialize_repr)] +#[repr(u8)] +enum MultipleOthers { + #[serde(other)] + A, + #[serde(other)] + B, +} + +fn main() {} diff --git a/vendor/serde_repr/tests/ui/multiple_others.stderr b/vendor/serde_repr/tests/ui/multiple_others.stderr new file mode 100644 index 000000000..599d5e172 --- /dev/null +++ b/vendor/serde_repr/tests/ui/multiple_others.stderr @@ -0,0 +1,7 @@ +error: only one variant can be #[serde(other)] + --> tests/ui/multiple_others.rs:3:10 + | +3 | #[derive(Deserialize_repr)] + | ^^^^^^^^^^^^^^^^ + | + = note: this error originates in the derive macro `Deserialize_repr` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/vendor/serde_repr/tests/ui/non_unit_variant.rs b/vendor/serde_repr/tests/ui/non_unit_variant.rs new file mode 100644 index 000000000..9cdc80d0a --- /dev/null +++ b/vendor/serde_repr/tests/ui/non_unit_variant.rs @@ -0,0 +1,12 @@ +use serde_repr::Serialize_repr; + +#[derive(Serialize_repr)] +#[repr(u8)] +enum SmallPrime { + Two(u8), + Three(u8), + Five(u8), + Seven(u8), +} + +fn main() {} diff --git a/vendor/serde_repr/tests/ui/non_unit_variant.stderr b/vendor/serde_repr/tests/ui/non_unit_variant.stderr new file mode 100644 index 000000000..8eaf0c1d9 --- /dev/null +++ b/vendor/serde_repr/tests/ui/non_unit_variant.stderr @@ -0,0 +1,5 @@ +error: must be a unit variant + --> tests/ui/non_unit_variant.rs:6:5 + | +6 | Two(u8), + | ^^^ diff --git a/vendor/serde_repr/tests/ui/not_enum.rs b/vendor/serde_repr/tests/ui/not_enum.rs new file mode 100644 index 000000000..92a1d746d --- /dev/null +++ b/vendor/serde_repr/tests/ui/not_enum.rs @@ -0,0 +1,11 @@ +use serde_repr::Serialize_repr; + +#[derive(Serialize_repr)] +struct SmallPrime { + two: u8, + three: u8, + five: u8, + seven: u8, +} + +fn main() {} diff --git a/vendor/serde_repr/tests/ui/not_enum.stderr b/vendor/serde_repr/tests/ui/not_enum.stderr new file mode 100644 index 000000000..26ad4c313 --- /dev/null +++ b/vendor/serde_repr/tests/ui/not_enum.stderr @@ -0,0 +1,7 @@ +error: input must be an enum + --> tests/ui/not_enum.rs:3:10 + | +3 | #[derive(Serialize_repr)] + | ^^^^^^^^^^^^^^ + | + = note: this error originates in the derive macro `Serialize_repr` (in Nightly builds, run with -Z macro-backtrace for more info) |