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diff --git a/third_party/rust/paste-impl/.cargo-checksum.json b/third_party/rust/paste-impl/.cargo-checksum.json new file mode 100644 index 0000000000..acd2f7765c --- /dev/null +++ b/third_party/rust/paste-impl/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"a38a5cd4f98c83b4e3da74ea12f2e9ec9839c4b344f4b13be5d13280bf38b928","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"7f697f191d6ffb32881a6bcf535e817ebbebaaa11b9aacf4f0b26fd32e2cc201","src/enum_hack.rs":"c01854a6921de3bb55670d0f5a359fed3d68b36db837b858cc3ed1553fc13a74","src/lib.rs":"ed045c1ac2a53e733bb6065805707d6d327edf30345f4a9a8bd5db8d7041e2ca"},"package":"2e0bf239e447e67ff6d16a8bb5e4d4bd2343acf5066061c0e8e06ac5ba8ca68c"}
\ No newline at end of file diff --git a/third_party/rust/paste-impl/Cargo.toml b/third_party/rust/paste-impl/Cargo.toml new file mode 100644 index 0000000000..5b7eaad89f --- /dev/null +++ b/third_party/rust/paste-impl/Cargo.toml @@ -0,0 +1,36 @@ +# 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 believe there's an error in this file please file an +# issue against the rust-lang/cargo repository. If you're +# editing this file be aware that the upstream Cargo.toml +# will likely look very different (and much more reasonable) + +[package] +edition = "2018" +name = "paste-impl" +version = "0.1.12" +authors = ["David Tolnay <dtolnay@gmail.com>"] +description = "Implementation detail of the `paste` crate" +license = "MIT OR Apache-2.0" +repository = "https://github.com/dtolnay/paste" +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] + +[lib] +proc-macro = true +[dependencies.proc-macro-hack] +version = "0.5" + +[dependencies.proc-macro2] +version = "1.0" + +[dependencies.quote] +version = "1.0" + +[dependencies.syn] +version = "1.0" diff --git a/third_party/rust/paste-impl/LICENSE-APACHE b/third_party/rust/paste-impl/LICENSE-APACHE new file mode 100644 index 0000000000..16fe87b06e --- /dev/null +++ b/third_party/rust/paste-impl/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/third_party/rust/paste-impl/src/enum_hack.rs b/third_party/rust/paste-impl/src/enum_hack.rs new file mode 100644 index 0000000000..626b265be5 --- /dev/null +++ b/third_party/rust/paste-impl/src/enum_hack.rs @@ -0,0 +1,61 @@ +use std::collections::hash_map::DefaultHasher; +use std::hash::{Hash, Hasher}; + +use proc_macro2::{Ident, Span, TokenStream, TokenTree}; +use quote::quote; +use syn::parse::{Parse, ParseStream, Result}; +use syn::{braced, parenthesized, parse_macro_input, Token}; + +pub fn wrap(output: TokenStream) -> TokenStream { + let mut hasher = DefaultHasher::default(); + output.to_string().hash(&mut hasher); + let mangled_name = format!("_paste_{}", hasher.finish()); + let ident = Ident::new(&mangled_name, Span::call_site()); + + quote! { + #[derive(paste::EnumHack)] + enum #ident { + Value = (stringify! { + #output + }, 0).1, + } + } +} + +struct EnumHack { + token_stream: TokenStream, +} + +impl Parse for EnumHack { + fn parse(input: ParseStream) -> Result<Self> { + input.parse::<Token![enum]>()?; + input.parse::<Ident>()?; + + let braces; + braced!(braces in input); + braces.parse::<Ident>()?; + braces.parse::<Token![=]>()?; + + let parens; + parenthesized!(parens in braces); + parens.parse::<Ident>()?; + parens.parse::<Token![!]>()?; + + let inner; + braced!(inner in parens); + let token_stream: TokenStream = inner.parse()?; + + parens.parse::<Token![,]>()?; + parens.parse::<TokenTree>()?; + braces.parse::<Token![.]>()?; + braces.parse::<TokenTree>()?; + braces.parse::<Token![,]>()?; + + Ok(EnumHack { token_stream }) + } +} + +pub fn extract(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let inner = parse_macro_input!(input as EnumHack); + proc_macro::TokenStream::from(inner.token_stream) +} diff --git a/third_party/rust/paste-impl/src/lib.rs b/third_party/rust/paste-impl/src/lib.rs new file mode 100644 index 0000000000..dce8bb07fd --- /dev/null +++ b/third_party/rust/paste-impl/src/lib.rs @@ -0,0 +1,248 @@ +extern crate proc_macro; + +mod enum_hack; + +use proc_macro2::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree}; +use proc_macro_hack::proc_macro_hack; +use quote::{quote, ToTokens}; +use std::iter::FromIterator; +use syn::parse::{Error, Parse, ParseStream, Parser, Result}; +use syn::{parenthesized, parse_macro_input, Lit, LitStr, Token}; + +#[proc_macro] +pub fn item(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let input = parse_macro_input!(input as PasteInput); + proc_macro::TokenStream::from(input.expanded) +} + +#[proc_macro] +pub fn item_with_macros(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let input = parse_macro_input!(input as PasteInput); + proc_macro::TokenStream::from(enum_hack::wrap(input.expanded)) +} + +#[proc_macro_hack] +pub fn expr(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let input = parse_macro_input!(input as PasteInput); + let output = input.expanded; + proc_macro::TokenStream::from(quote!({ #output })) +} + +#[doc(hidden)] +#[proc_macro_derive(EnumHack)] +pub fn enum_hack(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + enum_hack::extract(input) +} + +struct PasteInput { + expanded: TokenStream, +} + +impl Parse for PasteInput { + fn parse(input: ParseStream) -> Result<Self> { + let mut expanded = TokenStream::new(); + while !input.is_empty() { + match input.parse()? { + TokenTree::Group(group) => { + let delimiter = group.delimiter(); + let content = group.stream(); + let span = group.span(); + if delimiter == Delimiter::Bracket && is_paste_operation(&content) { + let segments = parse_bracket_as_segments.parse2(content)?; + let pasted = paste_segments(span, &segments)?; + pasted.to_tokens(&mut expanded); + } else if is_none_delimited_single_ident_or_lifetime(delimiter, &content) { + content.to_tokens(&mut expanded); + } else { + let nested = PasteInput::parse.parse2(content)?; + let mut group = Group::new(delimiter, nested.expanded); + group.set_span(span); + group.to_tokens(&mut expanded); + } + } + other => other.to_tokens(&mut expanded), + } + } + Ok(PasteInput { expanded }) + } +} + +fn is_paste_operation(input: &TokenStream) -> bool { + let input = input.clone(); + parse_bracket_as_segments.parse2(input).is_ok() +} + +// https://github.com/dtolnay/paste/issues/26 +fn is_none_delimited_single_ident_or_lifetime(delimiter: Delimiter, input: &TokenStream) -> bool { + if delimiter != Delimiter::None { + return false; + } + + #[derive(PartialEq)] + enum State { + Init, + Ident, + Apostrophe, + Lifetime, + } + + let mut state = State::Init; + for tt in input.clone() { + state = match (state, &tt) { + (State::Init, TokenTree::Ident(_)) => State::Ident, + (State::Init, TokenTree::Punct(punct)) if punct.as_char() == '\'' => State::Apostrophe, + (State::Apostrophe, TokenTree::Ident(_)) => State::Lifetime, + _ => return false, + }; + } + state == State::Ident || state == State::Lifetime +} + +enum Segment { + String(String), + Apostrophe(Span), + Env(LitStr), + Modifier(Token![:], Ident), +} + +fn parse_bracket_as_segments(input: ParseStream) -> Result<Vec<Segment>> { + input.parse::<Token![<]>()?; + + let segments = parse_segments(input)?; + + input.parse::<Token![>]>()?; + if !input.is_empty() { + return Err(input.error("invalid input")); + } + Ok(segments) +} + +fn parse_segments(input: ParseStream) -> Result<Vec<Segment>> { + let mut segments = Vec::new(); + while !(input.is_empty() || input.peek(Token![>])) { + match input.parse()? { + TokenTree::Ident(ident) => { + let mut fragment = ident.to_string(); + if fragment.starts_with("r#") { + fragment = fragment.split_off(2); + } + if fragment == "env" && input.peek(Token![!]) { + input.parse::<Token![!]>()?; + let arg; + parenthesized!(arg in input); + let var: LitStr = arg.parse()?; + segments.push(Segment::Env(var)); + } else { + segments.push(Segment::String(fragment)); + } + } + TokenTree::Literal(lit) => { + let value = match syn::parse_str(&lit.to_string())? { + Lit::Str(string) => string.value().replace('-', "_"), + Lit::Int(_) => lit.to_string(), + _ => return Err(Error::new(lit.span(), "unsupported literal")), + }; + segments.push(Segment::String(value)); + } + TokenTree::Punct(punct) => match punct.as_char() { + '_' => segments.push(Segment::String("_".to_string())), + '\'' => segments.push(Segment::Apostrophe(punct.span())), + ':' => segments.push(Segment::Modifier(Token), input.parse()?)), + _ => return Err(Error::new(punct.span(), "unexpected punct")), + }, + TokenTree::Group(group) => { + if group.delimiter() == Delimiter::None { + let nested = parse_segments.parse2(group.stream())?; + segments.extend(nested); + } else { + return Err(Error::new(group.span(), "unexpected token")); + } + } + } + } + Ok(segments) +} + +fn paste_segments(span: Span, segments: &[Segment]) -> Result<TokenStream> { + let mut evaluated = Vec::new(); + let mut is_lifetime = false; + + for segment in segments { + match segment { + Segment::String(segment) => { + evaluated.push(segment.clone()); + } + Segment::Apostrophe(span) => { + if is_lifetime { + return Err(Error::new(*span, "unexpected lifetime")); + } + is_lifetime = true; + } + Segment::Env(var) => { + let resolved = match std::env::var(var.value()) { + Ok(resolved) => resolved, + Err(_) => { + return Err(Error::new(var.span(), "no such env var")); + } + }; + let resolved = resolved.replace('-', "_"); + evaluated.push(resolved); + } + Segment::Modifier(colon, ident) => { + let span = quote!(#colon #ident); + let last = match evaluated.pop() { + Some(last) => last, + None => return Err(Error::new_spanned(span, "unexpected modifier")), + }; + if ident == "lower" { + evaluated.push(last.to_lowercase()); + } else if ident == "upper" { + evaluated.push(last.to_uppercase()); + } else if ident == "snake" { + let mut acc = String::new(); + let mut prev = '_'; + for ch in last.chars() { + if ch.is_uppercase() && prev != '_' { + acc.push('_'); + } + acc.push(ch); + prev = ch; + } + evaluated.push(acc.to_lowercase()); + } else if ident == "camel" { + let mut acc = String::new(); + let mut prev = '_'; + for ch in last.chars() { + if ch != '_' { + if prev == '_' { + for chu in ch.to_uppercase() { + acc.push(chu); + } + } else if prev.is_uppercase() { + for chl in ch.to_lowercase() { + acc.push(chl); + } + } else { + acc.push(ch); + } + } + prev = ch; + } + evaluated.push(acc); + } else { + return Err(Error::new_spanned(span, "unsupported modifier")); + } + } + } + } + + let pasted = evaluated.into_iter().collect::<String>(); + let ident = TokenTree::Ident(Ident::new(&pasted, span)); + let tokens = if is_lifetime { + let apostrophe = TokenTree::Punct(Punct::new('\'', Spacing::Joint)); + vec![apostrophe, ident] + } else { + vec![ident] + }; + Ok(TokenStream::from_iter(tokens)) +} diff --git a/third_party/rust/paste/.cargo-checksum.json b/third_party/rust/paste/.cargo-checksum.json new file mode 100644 index 0000000000..f495909ff1 --- /dev/null +++ b/third_party/rust/paste/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"477260b435d48cb99849ea0459048d6b11107a50fdc3ba65e36687aff6b343e3","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"7f697f191d6ffb32881a6bcf535e817ebbebaaa11b9aacf4f0b26fd32e2cc201","README.md":"5c26782fd4a0c9f5a2de81d692c1069c0ad846a4a00d75fe1f0b5f8f197e0041","src/lib.rs":"1863f79ae0c878576689f41262dbdda46c1340c4dba8fe0a1c44397648e9cbf1","tests/compiletest.rs":"0a52a44786aea1c299c695bf948b2ed2081e4cc344e5c2cadceab4eb03d0010d","tests/test.rs":"0470e71f6a8b55c75ec2a736e787705db0d3ee9f24505fa2661521de4265d0c4","tests/ui/case-warning.rs":"905a6721d6ca7820cb37acfa9d684ba0e6c6ef043e75d494b697d0b97a8894d0","tests/ui/case-warning.stderr":"c86e816d08af760a01840b1de831c57751469ed6cb1fe1e51af527cee2359dac","tests/ui/no-env-var.rs":"3b93779a3889236256520addafa3210fa95115b4a37b43890e726c0e4c6b41c4","tests/ui/no-env-var.stderr":"99283b6275c2572129109327d647bbcc789e2321ac1267be61d3f856c64c4108","tests/ui/unexpected-modifier.rs":"61c2a233cd947fdf04c44472608fbf04d797bfa3dac8d66ccdb91b01c7a27ca0","tests/ui/unexpected-modifier.stderr":"33b47ba0cfea8e93cd9e30456cc522e35d4ef7c64d5a46eb943e46ab20dc037e","tests/ui/unsupported-modifier.rs":"5b7159f9467ffaa790c82c0126a99e770a0637eadc4c0f9b5cdf43d0034fdc9e","tests/ui/unsupported-modifier.stderr":"5020c31d20e558846b82036dd940e09d92e40e09b5431f4c8450bbc6a3ba5114"},"package":"0a229b1c58c692edcaa5b9b0948084f130f55d2dcc15b02fcc5340b2b4521476"}
\ No newline at end of file diff --git a/third_party/rust/paste/Cargo.toml b/third_party/rust/paste/Cargo.toml new file mode 100644 index 0000000000..3b7b5ad7c0 --- /dev/null +++ b/third_party/rust/paste/Cargo.toml @@ -0,0 +1,33 @@ +# 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 believe there's an error in this file please file an +# issue against the rust-lang/cargo repository. If you're +# editing this file be aware that the upstream Cargo.toml +# will likely look very different (and much more reasonable) + +[package] +edition = "2018" +name = "paste" +version = "0.1.12" +authors = ["David Tolnay <dtolnay@gmail.com>"] +description = "Macros for all your token pasting needs" +readme = "README.md" +license = "MIT OR Apache-2.0" +repository = "https://github.com/dtolnay/paste" +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] +[dependencies.paste-impl] +version = "=0.1.12" + +[dependencies.proc-macro-hack] +version = "0.5.9" +[dev-dependencies.rustversion] +version = "1.0" + +[dev-dependencies.trybuild] +version = "1.0" diff --git a/third_party/rust/paste/LICENSE-APACHE b/third_party/rust/paste/LICENSE-APACHE new file mode 100644 index 0000000000..16fe87b06e --- /dev/null +++ b/third_party/rust/paste/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. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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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/third_party/rust/paste/README.md b/third_party/rust/paste/README.md new file mode 100644 index 0000000000..8ccc56807a --- /dev/null +++ b/third_party/rust/paste/README.md @@ -0,0 +1,154 @@ +Macros for all your token pasting needs +======================================= + +[](https://travis-ci.org/dtolnay/paste) +[](https://crates.io/crates/paste) +[](https://docs.rs/paste) + +The nightly-only [`concat_idents!`] macro in the Rust standard library is +notoriously underpowered in that its concatenated identifiers can only refer to +existing items, they can never be used to define something new. + +[`concat_idents!`]: https://doc.rust-lang.org/std/macro.concat_idents.html + +This crate provides a flexible way to paste together identifiers in a macro, +including using pasted identifiers to define new items. + +```toml +[dependencies] +paste = "0.1" +``` + +This approach works with any stable or nightly Rust compiler 1.30+. + +<br> + +## Pasting identifiers + +There are two entry points, `paste::expr!` for macros in expression position and +`paste::item!` for macros in item position. + +Within either one, identifiers inside `[<`...`>]` are pasted together to form a +single identifier. + +```rust +// Macro in item position: at module scope or inside of an impl block. +paste::item! { + // Defines a const called `QRST`. + const [<Q R S T>]: &str = "success!"; +} + +fn main() { + // Macro in expression position: inside a function body. + assert_eq!( + paste::expr! { [<Q R S T>].len() }, + 8, + ); +} +``` + +<br> + +## More elaborate examples + +This program demonstrates how you may want to bundle a paste invocation inside +of a more convenient user-facing macro of your own. Here the `routes!(A, B)` +macro expands to a vector containing `ROUTE_A` and `ROUTE_B`. + +```rust +const ROUTE_A: &str = "/a"; +const ROUTE_B: &str = "/b"; + +macro_rules! routes { + ($($route:ident),*) => {{ + paste::expr! { + vec![$( [<ROUTE_ $route>] ),*] + } + }} +} + +fn main() { + let routes = routes!(A, B); + assert_eq!(routes, vec!["/a", "/b"]); +} +``` + +The next example shows a macro that generates accessor methods for some struct +fields. + +```rust +macro_rules! make_a_struct_and_getters { + ($name:ident { $($field:ident),* }) => { + // Define a struct. This expands to: + // + // pub struct S { + // a: String, + // b: String, + // c: String, + // } + pub struct $name { + $( + $field: String, + )* + } + + // Build an impl block with getters. This expands to: + // + // impl S { + // pub fn get_a(&self) -> &str { &self.a } + // pub fn get_b(&self) -> &str { &self.b } + // pub fn get_c(&self) -> &str { &self.c } + // } + paste::item! { + impl $name { + $( + pub fn [<get_ $field>](&self) -> &str { + &self.$field + } + )* + } + } + } +} + +make_a_struct_and_getters!(S { a, b, c }); + +fn call_some_getters(s: &S) -> bool { + s.get_a() == s.get_b() && s.get_c().is_empty() +} +``` + +<br> + +## Case conversion + +Use `$var:lower` or `$var:upper` in the segment list to convert an interpolated +segment to lower- or uppercase as part of the paste. For example, `[<ld_ +$reg:lower _expr>]` would paste to `ld_bc_expr` if invoked with $reg=`Bc`. + +Use `$var:snake` to convert CamelCase input to snake\_case. +Use `$var:camel` to convert snake\_case to CamelCase. +These compose, so for example `$var:snake:upper` would give you SCREAMING\_CASE. + +The precise Unicode conversions are as defined by [`str::to_lowercase`] and +[`str::to_uppercase`]. + +[`str::to_lowercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_lowercase +[`str::to_uppercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_uppercase + +<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/third_party/rust/paste/src/lib.rs b/third_party/rust/paste/src/lib.rs new file mode 100644 index 0000000000..6d73ee33f0 --- /dev/null +++ b/third_party/rust/paste/src/lib.rs @@ -0,0 +1,150 @@ +//! The nightly-only [`concat_idents!`] macro in the Rust standard library is +//! notoriously underpowered in that its concatenated identifiers can only refer to +//! existing items, they can never be used to define something new. +//! +//! [`concat_idents!`]: https://doc.rust-lang.org/std/macro.concat_idents.html +//! +//! This crate provides a flexible way to paste together identifiers in a macro, +//! including using pasted identifiers to define new items. +//! +//! This approach works with any stable or nightly Rust compiler 1.30+. +//! +//! <br> +//! +//! # Pasting identifiers +//! +//! There are two entry points, `paste::expr!` for macros in expression position and +//! `paste::item!` for macros in item position. +//! +//! Within either one, identifiers inside `[<`...`>]` are pasted together to form a +//! single identifier. +//! +//! ``` +//! // Macro in item position: at module scope or inside of an impl block. +//! paste::item! { +//! // Defines a const called `QRST`. +//! const [<Q R S T>]: &str = "success!"; +//! } +//! +//! fn main() { +//! // Macro in expression position: inside a function body. +//! assert_eq!( +//! paste::expr! { [<Q R S T>].len() }, +//! 8, +//! ); +//! } +//! ``` +//! +//! <br><br> +//! +//! # More elaborate examples +//! +//! This program demonstrates how you may want to bundle a paste invocation inside +//! of a more convenient user-facing macro of your own. Here the `routes!(A, B)` +//! macro expands to a vector containing `ROUTE_A` and `ROUTE_B`. +//! +//! ``` +//! const ROUTE_A: &str = "/a"; +//! const ROUTE_B: &str = "/b"; +//! +//! macro_rules! routes { +//! ($($route:ident),*) => {{ +//! paste::expr! { +//! vec![$( [<ROUTE_ $route>] ),*] +//! } +//! }} +//! } +//! +//! fn main() { +//! let routes = routes!(A, B); +//! assert_eq!(routes, vec!["/a", "/b"]); +//! } +//! ``` +//! +//! The next example shows a macro that generates accessor methods for some struct +//! fields. +//! +//! ``` +//! macro_rules! make_a_struct_and_getters { +//! ($name:ident { $($field:ident),* }) => { +//! // Define a struct. This expands to: +//! // +//! // pub struct S { +//! // a: String, +//! // b: String, +//! // c: String, +//! // } +//! pub struct $name { +//! $( +//! $field: String, +//! )* +//! } +//! +//! // Build an impl block with getters. This expands to: +//! // +//! // impl S { +//! // pub fn get_a(&self) -> &str { &self.a } +//! // pub fn get_b(&self) -> &str { &self.b } +//! // pub fn get_c(&self) -> &str { &self.c } +//! // } +//! paste::item! { +//! impl $name { +//! $( +//! pub fn [<get_ $field>](&self) -> &str { +//! &self.$field +//! } +//! )* +//! } +//! } +//! } +//! } +//! +//! make_a_struct_and_getters!(S { a, b, c }); +//! +//! fn call_some_getters(s: &S) -> bool { +//! s.get_a() == s.get_b() && s.get_c().is_empty() +//! } +//! # +//! # fn main() {} +//! ``` +//! +//! <br><br> +//! +//! # Case conversion +//! +//! Use `$var:lower` or `$var:upper` in the segment list to convert an +//! interpolated segment to lower- or uppercase as part of the paste. For +//! example, `[<ld_ $reg:lower _expr>]` would paste to `ld_bc_expr` if invoked +//! with $reg=`Bc`. +//! +//! Use `$var:snake` to convert CamelCase input to snake\_case. +//! Use `$var:camel` to convert snake\_case to CamelCase. +//! These compose, so for example `$var:snake:upper` would give you SCREAMING\_CASE. +//! +//! The precise Unicode conversions are as defined by [`str::to_lowercase`] and +//! [`str::to_uppercase`]. +//! +//! [`str::to_lowercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_lowercase +//! [`str::to_uppercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_uppercase + +#![no_std] + +use proc_macro_hack::proc_macro_hack; + +/// Paste identifiers within a macro invocation that expands to an expression. +#[proc_macro_hack] +pub use paste_impl::expr; + +/// Paste identifiers within a macro invocation that expands to one or more +/// items. +/// +/// An item is like a struct definition, function, impl block, or anything else +/// that can appear at the top level of a module scope. +pub use paste_impl::item; + +/// Paste identifiers within a macro invocation that expands to one or more +/// macro_rules macros or items containing macros. +pub use paste_impl::item_with_macros; + +#[doc(hidden)] +pub use paste_impl::EnumHack; diff --git a/third_party/rust/paste/tests/compiletest.rs b/third_party/rust/paste/tests/compiletest.rs new file mode 100644 index 0000000000..f9aea23b51 --- /dev/null +++ b/third_party/rust/paste/tests/compiletest.rs @@ -0,0 +1,6 @@ +#[rustversion::attr(not(nightly), ignore)] +#[test] +fn ui() { + let t = trybuild::TestCases::new(); + t.compile_fail("tests/ui/*.rs"); +} diff --git a/third_party/rust/paste/tests/test.rs b/third_party/rust/paste/tests/test.rs new file mode 100644 index 0000000000..3aecd8d8e9 --- /dev/null +++ b/third_party/rust/paste/tests/test.rs @@ -0,0 +1,307 @@ +mod test_basic { + struct Struct; + + paste::item! { + impl Struct { + fn [<a b c>]() {} + } + } + + #[test] + fn test() { + Struct::abc(); + } +} + +mod test_in_impl { + struct Struct; + + impl Struct { + paste::item! { + fn [<a b c>]() {} + } + } + + #[test] + fn test() { + Struct::abc(); + } +} + +#[test] +fn test_shared_hygiene() { + paste::expr! { + let [<a a>] = 1; + assert_eq!([<a a>], 1); + } +} + +#[test] +fn test_repeat() { + const ROCKET_A: &'static str = "/a"; + const ROCKET_B: &'static str = "/b"; + + macro_rules! routes { + ($($route:ident),*) => {{ + paste::expr! { + vec![$( [<ROCKET_ $route>] ),*] + } + }} + } + + let routes = routes!(A, B); + assert_eq!(routes, vec!["/a", "/b"]); +} + +#[test] +fn test_integer() { + const CONST0: &'static str = "const0"; + + let pasted = paste::expr!([<CONST 0>]); + assert_eq!(pasted, CONST0); +} + +#[test] +fn test_underscore() { + paste::expr! { + const A_B: usize = 0; + assert_eq!([<A _ B>], 0); + } +} + +#[test] +fn test_lifetime() { + paste::expr! { + #[allow(dead_code)] + struct S<[<'d e>]> { + q: &[<'d e>] str, + } + } +} + +#[test] +fn test_keyword() { + paste::expr! { + struct [<F move>]; + + let _ = Fmove; + } +} + +#[test] +fn test_literal_str() { + paste::expr! { + struct [<Foo "Bar-Baz">]; + + let _ = FooBar_Baz; + } +} + +#[test] +fn test_env_literal() { + paste::expr! { + struct [<Lib env bar>]; + + let _ = Libenvbar; + } +} + +#[test] +fn test_env_present() { + paste::expr! { + struct [<Lib env!("CARGO_PKG_NAME")>]; + + let _ = Libpaste; + } +} + +#[test] +fn test_raw_identifier() { + paste::expr! { + struct [<F r#move>]; + + let _ = Fmove; + } +} + +#[test] +fn test_false_start() { + trait Trait { + fn f() -> usize; + } + + struct S; + + impl Trait for S { + fn f() -> usize { + 0 + } + } + + paste::expr! { + let x = [<S as Trait>::f()]; + assert_eq!(x[0], 0); + } +} + +#[test] +fn test_local_variable() { + let yy = 0; + + paste::expr! { + assert_eq!([<y y>], 0); + } +} + +mod test_none_delimited_single_ident { + macro_rules! m { + ($id:ident) => { + paste::item! { + fn f() -> &'static str { + stringify!($id) + } + } + }; + } + + m!(i32x4); + + #[test] + fn test() { + assert_eq!(f(), "i32x4"); + } +} + +mod test_none_delimited_single_lifetime { + macro_rules! m { + ($life:lifetime) => { + paste::item! { + pub struct S; + impl<$life> S { + fn f() {} + } + } + }; + } + + m!('a); + + #[test] + fn test() { + S::f(); + } +} + +mod test_to_lower { + macro_rules! m { + ($id:ident) => { + paste::item! { + fn [<my_ $id:lower _here>](_arg: u8) -> &'static str { + stringify!([<$id:lower>]) + } + } + }; + } + + m!(Test); + + #[test] + fn test_to_lower() { + assert_eq!(my_test_here(0), "test"); + } +} + +#[test] +fn test_env_to_lower() { + paste::expr! { + struct [<Lib env!("CARGO_PKG_NAME"):lower>]; + + let _ = Libpaste; + } +} + +mod test_to_upper { + macro_rules! m { + ($id:ident) => { + paste::item! { + const [<MY_ $id:upper _HERE>]: &str = stringify!([<$id:upper>]); + } + }; + } + + m!(Test); + + #[test] + fn test_to_upper() { + assert_eq!(MY_TEST_HERE, "TEST"); + } +} + +#[test] +fn test_env_to_upper() { + paste::expr! { + const [<LIB env!("CARGO_PKG_NAME"):upper>]: &str = "libpaste"; + + let _ = LIBPASTE; + } +} + +mod test_to_snake { + macro_rules! m { + ($id:ident) => { + paste::item! { + const DEFAULT_SNAKE: &str = stringify!([<$id:snake>]); + const LOWER_SNAKE: &str = stringify!([<$id:snake:lower>]); + const UPPER_SNAKE: &str = stringify!([<$id:snake:upper>]); + } + }; + } + + m!(ThisIsButATest); + + #[test] + fn test_to_snake() { + assert_eq!(DEFAULT_SNAKE, "this_is_but_a_test"); + assert_eq!(LOWER_SNAKE, "this_is_but_a_test"); + assert_eq!(UPPER_SNAKE, "THIS_IS_BUT_A_TEST"); + } +} + +#[test] +fn test_env_to_snake() { + paste::expr! { + const [<LIB env!("CARGO_PKG_NAME"):snake:upper>]: &str = "libpaste"; + + let _ = LIBPASTE; + } +} + +mod test_to_camel { + macro_rules! m { + ($id:ident) => { + paste::item! { + const DEFAULT_CAMEL: &str = stringify!([<$id:camel>]); + const LOWER_CAMEL: &str = stringify!([<$id:camel:lower>]); + const UPPER_CAMEL: &str = stringify!([<$id:camel:upper>]); + } + }; + } + + m!(this_is_but_a_test); + + #[test] + fn test_to_camel() { + assert_eq!(DEFAULT_CAMEL, "ThisIsButATest"); + assert_eq!(LOWER_CAMEL, "thisisbutatest"); + assert_eq!(UPPER_CAMEL, "THISISBUTATEST"); + } +} + +#[test] +fn test_env_to_camel() { + paste::expr! { + const [<LIB env!("CARGO_PKG_NAME"):camel>]: &str = "libpaste"; + + let _ = LIBPaste; + } +} diff --git a/third_party/rust/paste/tests/ui/case-warning.rs b/third_party/rust/paste/tests/ui/case-warning.rs new file mode 100644 index 0000000000..4b41ab683d --- /dev/null +++ b/third_party/rust/paste/tests/ui/case-warning.rs @@ -0,0 +1,13 @@ +#![deny(warnings)] + +macro_rules! m { + ($i:ident) => { + paste::item! { + pub fn [<foo $i>]() {} + } + }; +} + +m!(Bar); + +fn main() {} diff --git a/third_party/rust/paste/tests/ui/case-warning.stderr b/third_party/rust/paste/tests/ui/case-warning.stderr new file mode 100644 index 0000000000..5bf37a083c --- /dev/null +++ b/third_party/rust/paste/tests/ui/case-warning.stderr @@ -0,0 +1,16 @@ +error: function `fooBar` should have a snake case name + --> $DIR/case-warning.rs:6:20 + | +6 | pub fn [<foo $i>]() {} + | ^^^^^^^^^^ help: convert the identifier to snake case: `foo_bar` +... +11 | m!(Bar); + | -------- in this macro invocation + | +note: the lint level is defined here + --> $DIR/case-warning.rs:1:9 + | +1 | #![deny(warnings)] + | ^^^^^^^^ + = note: `#[deny(non_snake_case)]` implied by `#[deny(warnings)]` + = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/third_party/rust/paste/tests/ui/no-env-var.rs b/third_party/rust/paste/tests/ui/no-env-var.rs new file mode 100644 index 0000000000..87aad35091 --- /dev/null +++ b/third_party/rust/paste/tests/ui/no-env-var.rs @@ -0,0 +1,5 @@ +paste::item! { + fn [<a env!("PASTE_UNKNOWN") b>]() {} +} + +fn main() {} diff --git a/third_party/rust/paste/tests/ui/no-env-var.stderr b/third_party/rust/paste/tests/ui/no-env-var.stderr new file mode 100644 index 0000000000..2ec206d665 --- /dev/null +++ b/third_party/rust/paste/tests/ui/no-env-var.stderr @@ -0,0 +1,5 @@ +error: no such env var + --> $DIR/no-env-var.rs:2:17 + | +2 | fn [<a env!("PASTE_UNKNOWN") b>]() {} + | ^^^^^^^^^^^^^^^ diff --git a/third_party/rust/paste/tests/ui/unexpected-modifier.rs b/third_party/rust/paste/tests/ui/unexpected-modifier.rs new file mode 100644 index 0000000000..00a1e99c6d --- /dev/null +++ b/third_party/rust/paste/tests/ui/unexpected-modifier.rs @@ -0,0 +1,5 @@ +paste::item! { + fn [<:lower x>]() {} +} + +fn main() {} diff --git a/third_party/rust/paste/tests/ui/unexpected-modifier.stderr b/third_party/rust/paste/tests/ui/unexpected-modifier.stderr new file mode 100644 index 0000000000..4a518b8ea8 --- /dev/null +++ b/third_party/rust/paste/tests/ui/unexpected-modifier.stderr @@ -0,0 +1,5 @@ +error: unexpected modifier + --> $DIR/unexpected-modifier.rs:2:10 + | +2 | fn [<:lower x>]() {} + | ^^^^^^ diff --git a/third_party/rust/paste/tests/ui/unsupported-modifier.rs b/third_party/rust/paste/tests/ui/unsupported-modifier.rs new file mode 100644 index 0000000000..5ab049fbb1 --- /dev/null +++ b/third_party/rust/paste/tests/ui/unsupported-modifier.rs @@ -0,0 +1,5 @@ +paste::item! { + fn [<a:pillow>]() {} +} + +fn main() {} diff --git a/third_party/rust/paste/tests/ui/unsupported-modifier.stderr b/third_party/rust/paste/tests/ui/unsupported-modifier.stderr new file mode 100644 index 0000000000..ffbc742a29 --- /dev/null +++ b/third_party/rust/paste/tests/ui/unsupported-modifier.stderr @@ -0,0 +1,5 @@ +error: unsupported modifier + --> $DIR/unsupported-modifier.rs:2:11 + | +2 | fn [<a:pillow>]() {} + | ^^^^^^^ |