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-rw-r--r--third_party/rust/prost-derive/.cargo-checksum.json1
-rw-r--r--third_party/rust/prost-derive/Cargo.toml40
-rw-r--r--third_party/rust/prost-derive/README.md16
-rw-r--r--third_party/rust/prost-derive/src/field/group.rs134
-rw-r--r--third_party/rust/prost-derive/src/field/map.rs394
-rw-r--r--third_party/rust/prost-derive/src/field/message.rs134
-rw-r--r--third_party/rust/prost-derive/src/field/mod.rs366
-rw-r--r--third_party/rust/prost-derive/src/field/oneof.rs99
-rw-r--r--third_party/rust/prost-derive/src/field/scalar.rs810
-rw-r--r--third_party/rust/prost-derive/src/lib.rs470
10 files changed, 2464 insertions, 0 deletions
diff --git a/third_party/rust/prost-derive/.cargo-checksum.json b/third_party/rust/prost-derive/.cargo-checksum.json
new file mode 100644
index 0000000000..e64d4cd29b
--- /dev/null
+++ b/third_party/rust/prost-derive/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"4af10c29150183b223cd13b9eb0375fdbef6daba35e43a654c55c0491ca78ba2","README.md":"6c67fa1e48f14adfaf834f520f798ddfb79f90804f46cc215ee391a7d57913a4","src/field/group.rs":"dfd31b34008741abc857dc11362c11a06afd8eddceb62924443bf2bea117460a","src/field/map.rs":"69e1fa14cfeb4d4407b9c343a2a72b4ba68c3ecb7af912965a63b50e91dd61fb","src/field/message.rs":"fb910a563eba0b0c68a7a3855f7877535931faef4d788b05a3402f0cdd037e3e","src/field/mod.rs":"ca917a3f673623f0946e9e37ebad2916f3c1f8d163a1844143ef7d21d245394c","src/field/oneof.rs":"4fc488445b05e464070fadd8799cafb806db5c23d1494c4300cb293394863012","src/field/scalar.rs":"03d69f74daa2037a0210a086bd873ae9beca6b615e2973c96c43a6d0d30aa525","src/lib.rs":"8cfa6f1fc707e8931df82f9df67fa07e1b822b7581e4c9733e3ce24febabf708"},"package":"600d2f334aa05acb02a755e217ef1ab6dea4d51b58b7846588b747edec04efba"} \ No newline at end of file
diff --git a/third_party/rust/prost-derive/Cargo.toml b/third_party/rust/prost-derive/Cargo.toml
new file mode 100644
index 0000000000..d6c2d3e74c
--- /dev/null
+++ b/third_party/rust/prost-derive/Cargo.toml
@@ -0,0 +1,40 @@
+# 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 = "prost-derive"
+version = "0.8.0"
+authors = ["Dan Burkert <dan@danburkert.com>", "Tokio Contributors <team@tokio.rs>"]
+description = "A Protocol Buffers implementation for the Rust Language."
+documentation = "https://docs.rs/prost-derive"
+readme = "README.md"
+license = "Apache-2.0"
+repository = "https://github.com/tokio-rs/prost"
+
+[lib]
+proc_macro = true
+[dependencies.anyhow]
+version = "1"
+
+[dependencies.itertools]
+version = "0.10"
+
+[dependencies.proc-macro2]
+version = "1"
+
+[dependencies.quote]
+version = "1"
+
+[dependencies.syn]
+version = "1"
+features = ["extra-traits"]
diff --git a/third_party/rust/prost-derive/README.md b/third_party/rust/prost-derive/README.md
new file mode 100644
index 0000000000..a51050e7e6
--- /dev/null
+++ b/third_party/rust/prost-derive/README.md
@@ -0,0 +1,16 @@
+[![Documentation](https://docs.rs/prost-derive/badge.svg)](https://docs.rs/prost-derive/)
+[![Crate](https://img.shields.io/crates/v/prost-derive.svg)](https://crates.io/crates/prost-derive)
+
+# prost-derive
+
+`prost-derive` handles generating encoding and decoding implementations for Rust
+types annotated with `prost` annotation. For the most part, users of `prost`
+shouldn't need to interact with `prost-derive` directly.
+
+## License
+
+`prost-derive` is distributed under the terms of the Apache License (Version 2.0).
+
+See [LICENSE](../LICENSE) for details.
+
+Copyright 2017 Dan Burkert
diff --git a/third_party/rust/prost-derive/src/field/group.rs b/third_party/rust/prost-derive/src/field/group.rs
new file mode 100644
index 0000000000..6396128802
--- /dev/null
+++ b/third_party/rust/prost-derive/src/field/group.rs
@@ -0,0 +1,134 @@
+use anyhow::{bail, Error};
+use proc_macro2::TokenStream;
+use quote::{quote, ToTokens};
+use syn::Meta;
+
+use crate::field::{set_bool, set_option, tag_attr, word_attr, Label};
+
+#[derive(Clone)]
+pub struct Field {
+ pub label: Label,
+ pub tag: u32,
+}
+
+impl Field {
+ pub fn new(attrs: &[Meta], inferred_tag: Option<u32>) -> Result<Option<Field>, Error> {
+ let mut group = false;
+ let mut label = None;
+ let mut tag = None;
+ let mut boxed = false;
+
+ let mut unknown_attrs = Vec::new();
+
+ for attr in attrs {
+ if word_attr("group", attr) {
+ set_bool(&mut group, "duplicate group attributes")?;
+ } else if word_attr("boxed", attr) {
+ set_bool(&mut boxed, "duplicate boxed attributes")?;
+ } else if let Some(t) = tag_attr(attr)? {
+ set_option(&mut tag, t, "duplicate tag attributes")?;
+ } else if let Some(l) = Label::from_attr(attr) {
+ set_option(&mut label, l, "duplicate label attributes")?;
+ } else {
+ unknown_attrs.push(attr);
+ }
+ }
+
+ if !group {
+ return Ok(None);
+ }
+
+ match unknown_attrs.len() {
+ 0 => (),
+ 1 => bail!("unknown attribute for group field: {:?}", unknown_attrs[0]),
+ _ => bail!("unknown attributes for group field: {:?}", unknown_attrs),
+ }
+
+ let tag = match tag.or(inferred_tag) {
+ Some(tag) => tag,
+ None => bail!("group field is missing a tag attribute"),
+ };
+
+ Ok(Some(Field {
+ label: label.unwrap_or(Label::Optional),
+ tag,
+ }))
+ }
+
+ pub fn new_oneof(attrs: &[Meta]) -> Result<Option<Field>, Error> {
+ if let Some(mut field) = Field::new(attrs, None)? {
+ if let Some(attr) = attrs.iter().find(|attr| Label::from_attr(attr).is_some()) {
+ bail!(
+ "invalid attribute for oneof field: {}",
+ attr.path().into_token_stream()
+ );
+ }
+ field.label = Label::Required;
+ Ok(Some(field))
+ } else {
+ Ok(None)
+ }
+ }
+
+ pub fn encode(&self, ident: TokenStream) -> TokenStream {
+ let tag = self.tag;
+ match self.label {
+ Label::Optional => quote! {
+ if let Some(ref msg) = #ident {
+ ::prost::encoding::group::encode(#tag, msg, buf);
+ }
+ },
+ Label::Required => quote! {
+ ::prost::encoding::group::encode(#tag, &#ident, buf);
+ },
+ Label::Repeated => quote! {
+ for msg in &#ident {
+ ::prost::encoding::group::encode(#tag, msg, buf);
+ }
+ },
+ }
+ }
+
+ pub fn merge(&self, ident: TokenStream) -> TokenStream {
+ match self.label {
+ Label::Optional => quote! {
+ ::prost::encoding::group::merge(
+ tag,
+ wire_type,
+ #ident.get_or_insert_with(Default::default),
+ buf,
+ ctx,
+ )
+ },
+ Label::Required => quote! {
+ ::prost::encoding::group::merge(tag, wire_type, #ident, buf, ctx)
+ },
+ Label::Repeated => quote! {
+ ::prost::encoding::group::merge_repeated(tag, wire_type, #ident, buf, ctx)
+ },
+ }
+ }
+
+ pub fn encoded_len(&self, ident: TokenStream) -> TokenStream {
+ let tag = self.tag;
+ match self.label {
+ Label::Optional => quote! {
+ #ident.as_ref().map_or(0, |msg| ::prost::encoding::group::encoded_len(#tag, msg))
+ },
+ Label::Required => quote! {
+ ::prost::encoding::group::encoded_len(#tag, &#ident)
+ },
+ Label::Repeated => quote! {
+ ::prost::encoding::group::encoded_len_repeated(#tag, &#ident)
+ },
+ }
+ }
+
+ pub fn clear(&self, ident: TokenStream) -> TokenStream {
+ match self.label {
+ Label::Optional => quote!(#ident = ::core::option::Option::None),
+ Label::Required => quote!(#ident.clear()),
+ Label::Repeated => quote!(#ident.clear()),
+ }
+ }
+}
diff --git a/third_party/rust/prost-derive/src/field/map.rs b/third_party/rust/prost-derive/src/field/map.rs
new file mode 100644
index 0000000000..1228a6fae2
--- /dev/null
+++ b/third_party/rust/prost-derive/src/field/map.rs
@@ -0,0 +1,394 @@
+use anyhow::{bail, Error};
+use proc_macro2::{Span, TokenStream};
+use quote::quote;
+use syn::{Ident, Lit, Meta, MetaNameValue, NestedMeta};
+
+use crate::field::{scalar, set_option, tag_attr};
+
+#[derive(Clone, Debug)]
+pub enum MapTy {
+ HashMap,
+ BTreeMap,
+}
+
+impl MapTy {
+ fn from_str(s: &str) -> Option<MapTy> {
+ match s {
+ "map" | "hash_map" => Some(MapTy::HashMap),
+ "btree_map" => Some(MapTy::BTreeMap),
+ _ => None,
+ }
+ }
+
+ fn module(&self) -> Ident {
+ match *self {
+ MapTy::HashMap => Ident::new("hash_map", Span::call_site()),
+ MapTy::BTreeMap => Ident::new("btree_map", Span::call_site()),
+ }
+ }
+
+ fn lib(&self) -> TokenStream {
+ match self {
+ MapTy::HashMap => quote! { std },
+ MapTy::BTreeMap => quote! { prost::alloc },
+ }
+ }
+}
+
+fn fake_scalar(ty: scalar::Ty) -> scalar::Field {
+ let kind = scalar::Kind::Plain(scalar::DefaultValue::new(&ty));
+ scalar::Field {
+ ty,
+ kind,
+ tag: 0, // Not used here
+ }
+}
+
+#[derive(Clone)]
+pub struct Field {
+ pub map_ty: MapTy,
+ pub key_ty: scalar::Ty,
+ pub value_ty: ValueTy,
+ pub tag: u32,
+}
+
+impl Field {
+ pub fn new(attrs: &[Meta], inferred_tag: Option<u32>) -> Result<Option<Field>, Error> {
+ let mut types = None;
+ let mut tag = None;
+
+ for attr in attrs {
+ if let Some(t) = tag_attr(attr)? {
+ set_option(&mut tag, t, "duplicate tag attributes")?;
+ } else if let Some(map_ty) = attr
+ .path()
+ .get_ident()
+ .and_then(|i| MapTy::from_str(&i.to_string()))
+ {
+ let (k, v): (String, String) = match &*attr {
+ Meta::NameValue(MetaNameValue {
+ lit: Lit::Str(lit), ..
+ }) => {
+ let items = lit.value();
+ let mut items = items.split(',').map(ToString::to_string);
+ let k = items.next().unwrap();
+ let v = match items.next() {
+ Some(k) => k,
+ None => bail!("invalid map attribute: must have key and value types"),
+ };
+ if items.next().is_some() {
+ bail!("invalid map attribute: {:?}", attr);
+ }
+ (k, v)
+ }
+ Meta::List(meta_list) => {
+ // TODO(rustlang/rust#23121): slice pattern matching would make this much nicer.
+ if meta_list.nested.len() != 2 {
+ bail!("invalid map attribute: must contain key and value types");
+ }
+ let k = match &meta_list.nested[0] {
+ NestedMeta::Meta(Meta::Path(k)) if k.get_ident().is_some() => {
+ k.get_ident().unwrap().to_string()
+ }
+ _ => bail!("invalid map attribute: key must be an identifier"),
+ };
+ let v = match &meta_list.nested[1] {
+ NestedMeta::Meta(Meta::Path(v)) if v.get_ident().is_some() => {
+ v.get_ident().unwrap().to_string()
+ }
+ _ => bail!("invalid map attribute: value must be an identifier"),
+ };
+ (k, v)
+ }
+ _ => return Ok(None),
+ };
+ set_option(
+ &mut types,
+ (map_ty, key_ty_from_str(&k)?, ValueTy::from_str(&v)?),
+ "duplicate map type attribute",
+ )?;
+ } else {
+ return Ok(None);
+ }
+ }
+
+ Ok(match (types, tag.or(inferred_tag)) {
+ (Some((map_ty, key_ty, value_ty)), Some(tag)) => Some(Field {
+ map_ty,
+ key_ty,
+ value_ty,
+ tag,
+ }),
+ _ => None,
+ })
+ }
+
+ pub fn new_oneof(attrs: &[Meta]) -> Result<Option<Field>, Error> {
+ Field::new(attrs, None)
+ }
+
+ /// Returns a statement which encodes the map field.
+ pub fn encode(&self, ident: TokenStream) -> TokenStream {
+ let tag = self.tag;
+ let key_mod = self.key_ty.module();
+ let ke = quote!(::prost::encoding::#key_mod::encode);
+ let kl = quote!(::prost::encoding::#key_mod::encoded_len);
+ let module = self.map_ty.module();
+ match &self.value_ty {
+ ValueTy::Scalar(scalar::Ty::Enumeration(ty)) => {
+ let default = quote!(#ty::default() as i32);
+ quote! {
+ ::prost::encoding::#module::encode_with_default(
+ #ke,
+ #kl,
+ ::prost::encoding::int32::encode,
+ ::prost::encoding::int32::encoded_len,
+ &(#default),
+ #tag,
+ &#ident,
+ buf,
+ );
+ }
+ }
+ ValueTy::Scalar(value_ty) => {
+ let val_mod = value_ty.module();
+ let ve = quote!(::prost::encoding::#val_mod::encode);
+ let vl = quote!(::prost::encoding::#val_mod::encoded_len);
+ quote! {
+ ::prost::encoding::#module::encode(
+ #ke,
+ #kl,
+ #ve,
+ #vl,
+ #tag,
+ &#ident,
+ buf,
+ );
+ }
+ }
+ ValueTy::Message => quote! {
+ ::prost::encoding::#module::encode(
+ #ke,
+ #kl,
+ ::prost::encoding::message::encode,
+ ::prost::encoding::message::encoded_len,
+ #tag,
+ &#ident,
+ buf,
+ );
+ },
+ }
+ }
+
+ /// Returns an expression which evaluates to the result of merging a decoded key value pair
+ /// into the map.
+ pub fn merge(&self, ident: TokenStream) -> TokenStream {
+ let key_mod = self.key_ty.module();
+ let km = quote!(::prost::encoding::#key_mod::merge);
+ let module = self.map_ty.module();
+ match &self.value_ty {
+ ValueTy::Scalar(scalar::Ty::Enumeration(ty)) => {
+ let default = quote!(#ty::default() as i32);
+ quote! {
+ ::prost::encoding::#module::merge_with_default(
+ #km,
+ ::prost::encoding::int32::merge,
+ #default,
+ &mut #ident,
+ buf,
+ ctx,
+ )
+ }
+ }
+ ValueTy::Scalar(value_ty) => {
+ let val_mod = value_ty.module();
+ let vm = quote!(::prost::encoding::#val_mod::merge);
+ quote!(::prost::encoding::#module::merge(#km, #vm, &mut #ident, buf, ctx))
+ }
+ ValueTy::Message => quote! {
+ ::prost::encoding::#module::merge(
+ #km,
+ ::prost::encoding::message::merge,
+ &mut #ident,
+ buf,
+ ctx,
+ )
+ },
+ }
+ }
+
+ /// Returns an expression which evaluates to the encoded length of the map.
+ pub fn encoded_len(&self, ident: TokenStream) -> TokenStream {
+ let tag = self.tag;
+ let key_mod = self.key_ty.module();
+ let kl = quote!(::prost::encoding::#key_mod::encoded_len);
+ let module = self.map_ty.module();
+ match &self.value_ty {
+ ValueTy::Scalar(scalar::Ty::Enumeration(ty)) => {
+ let default = quote!(#ty::default() as i32);
+ quote! {
+ ::prost::encoding::#module::encoded_len_with_default(
+ #kl,
+ ::prost::encoding::int32::encoded_len,
+ &(#default),
+ #tag,
+ &#ident,
+ )
+ }
+ }
+ ValueTy::Scalar(value_ty) => {
+ let val_mod = value_ty.module();
+ let vl = quote!(::prost::encoding::#val_mod::encoded_len);
+ quote!(::prost::encoding::#module::encoded_len(#kl, #vl, #tag, &#ident))
+ }
+ ValueTy::Message => quote! {
+ ::prost::encoding::#module::encoded_len(
+ #kl,
+ ::prost::encoding::message::encoded_len,
+ #tag,
+ &#ident,
+ )
+ },
+ }
+ }
+
+ pub fn clear(&self, ident: TokenStream) -> TokenStream {
+ quote!(#ident.clear())
+ }
+
+ /// Returns methods to embed in the message.
+ pub fn methods(&self, ident: &Ident) -> Option<TokenStream> {
+ if let ValueTy::Scalar(scalar::Ty::Enumeration(ty)) = &self.value_ty {
+ let key_ty = self.key_ty.rust_type();
+ let key_ref_ty = self.key_ty.rust_ref_type();
+
+ let get = Ident::new(&format!("get_{}", ident), Span::call_site());
+ let insert = Ident::new(&format!("insert_{}", ident), Span::call_site());
+ let take_ref = if self.key_ty.is_numeric() {
+ quote!(&)
+ } else {
+ quote!()
+ };
+
+ let get_doc = format!(
+ "Returns the enum value for the corresponding key in `{}`, \
+ or `None` if the entry does not exist or it is not a valid enum value.",
+ ident,
+ );
+ let insert_doc = format!("Inserts a key value pair into `{}`.", ident);
+ Some(quote! {
+ #[doc=#get_doc]
+ pub fn #get(&self, key: #key_ref_ty) -> ::core::option::Option<#ty> {
+ self.#ident.get(#take_ref key).cloned().and_then(#ty::from_i32)
+ }
+ #[doc=#insert_doc]
+ pub fn #insert(&mut self, key: #key_ty, value: #ty) -> ::core::option::Option<#ty> {
+ self.#ident.insert(key, value as i32).and_then(#ty::from_i32)
+ }
+ })
+ } else {
+ None
+ }
+ }
+
+ /// Returns a newtype wrapper around the map, implementing nicer Debug
+ ///
+ /// The Debug tries to convert any enumerations met into the variants if possible, instead of
+ /// outputting the raw numbers.
+ pub fn debug(&self, wrapper_name: TokenStream) -> TokenStream {
+ let type_name = match self.map_ty {
+ MapTy::HashMap => Ident::new("HashMap", Span::call_site()),
+ MapTy::BTreeMap => Ident::new("BTreeMap", Span::call_site()),
+ };
+
+ // A fake field for generating the debug wrapper
+ let key_wrapper = fake_scalar(self.key_ty.clone()).debug(quote!(KeyWrapper));
+ let key = self.key_ty.rust_type();
+ let value_wrapper = self.value_ty.debug();
+ let libname = self.map_ty.lib();
+ let fmt = quote! {
+ fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ #key_wrapper
+ #value_wrapper
+ let mut builder = f.debug_map();
+ for (k, v) in self.0 {
+ builder.entry(&KeyWrapper(k), &ValueWrapper(v));
+ }
+ builder.finish()
+ }
+ };
+ match &self.value_ty {
+ ValueTy::Scalar(ty) => {
+ let value = ty.rust_type();
+ quote! {
+ struct #wrapper_name<'a>(&'a ::#libname::collections::#type_name<#key, #value>);
+ impl<'a> ::core::fmt::Debug for #wrapper_name<'a> {
+ #fmt
+ }
+ }
+ }
+ ValueTy::Message => quote! {
+ struct #wrapper_name<'a, V: 'a>(&'a ::#libname::collections::#type_name<#key, V>);
+ impl<'a, V> ::core::fmt::Debug for #wrapper_name<'a, V>
+ where
+ V: ::core::fmt::Debug + 'a,
+ {
+ #fmt
+ }
+ },
+ }
+ }
+}
+
+fn key_ty_from_str(s: &str) -> Result<scalar::Ty, Error> {
+ let ty = scalar::Ty::from_str(s)?;
+ match ty {
+ scalar::Ty::Int32
+ | scalar::Ty::Int64
+ | scalar::Ty::Uint32
+ | scalar::Ty::Uint64
+ | scalar::Ty::Sint32
+ | scalar::Ty::Sint64
+ | scalar::Ty::Fixed32
+ | scalar::Ty::Fixed64
+ | scalar::Ty::Sfixed32
+ | scalar::Ty::Sfixed64
+ | scalar::Ty::Bool
+ | scalar::Ty::String => Ok(ty),
+ _ => bail!("invalid map key type: {}", s),
+ }
+}
+
+/// A map value type.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum ValueTy {
+ Scalar(scalar::Ty),
+ Message,
+}
+
+impl ValueTy {
+ fn from_str(s: &str) -> Result<ValueTy, Error> {
+ if let Ok(ty) = scalar::Ty::from_str(s) {
+ Ok(ValueTy::Scalar(ty))
+ } else if s.trim() == "message" {
+ Ok(ValueTy::Message)
+ } else {
+ bail!("invalid map value type: {}", s);
+ }
+ }
+
+ /// Returns a newtype wrapper around the ValueTy for nicer debug.
+ ///
+ /// If the contained value is enumeration, it tries to convert it to the variant. If not, it
+ /// just forwards the implementation.
+ fn debug(&self) -> TokenStream {
+ match self {
+ ValueTy::Scalar(ty) => fake_scalar(ty.clone()).debug(quote!(ValueWrapper)),
+ ValueTy::Message => quote!(
+ fn ValueWrapper<T>(v: T) -> T {
+ v
+ }
+ ),
+ }
+ }
+}
diff --git a/third_party/rust/prost-derive/src/field/message.rs b/third_party/rust/prost-derive/src/field/message.rs
new file mode 100644
index 0000000000..1ff7c37983
--- /dev/null
+++ b/third_party/rust/prost-derive/src/field/message.rs
@@ -0,0 +1,134 @@
+use anyhow::{bail, Error};
+use proc_macro2::TokenStream;
+use quote::{quote, ToTokens};
+use syn::Meta;
+
+use crate::field::{set_bool, set_option, tag_attr, word_attr, Label};
+
+#[derive(Clone)]
+pub struct Field {
+ pub label: Label,
+ pub tag: u32,
+}
+
+impl Field {
+ pub fn new(attrs: &[Meta], inferred_tag: Option<u32>) -> Result<Option<Field>, Error> {
+ let mut message = false;
+ let mut label = None;
+ let mut tag = None;
+ let mut boxed = false;
+
+ let mut unknown_attrs = Vec::new();
+
+ for attr in attrs {
+ if word_attr("message", attr) {
+ set_bool(&mut message, "duplicate message attribute")?;
+ } else if word_attr("boxed", attr) {
+ set_bool(&mut boxed, "duplicate boxed attribute")?;
+ } else if let Some(t) = tag_attr(attr)? {
+ set_option(&mut tag, t, "duplicate tag attributes")?;
+ } else if let Some(l) = Label::from_attr(attr) {
+ set_option(&mut label, l, "duplicate label attributes")?;
+ } else {
+ unknown_attrs.push(attr);
+ }
+ }
+
+ if !message {
+ return Ok(None);
+ }
+
+ match unknown_attrs.len() {
+ 0 => (),
+ 1 => bail!(
+ "unknown attribute for message field: {:?}",
+ unknown_attrs[0]
+ ),
+ _ => bail!("unknown attributes for message field: {:?}", unknown_attrs),
+ }
+
+ let tag = match tag.or(inferred_tag) {
+ Some(tag) => tag,
+ None => bail!("message field is missing a tag attribute"),
+ };
+
+ Ok(Some(Field {
+ label: label.unwrap_or(Label::Optional),
+ tag,
+ }))
+ }
+
+ pub fn new_oneof(attrs: &[Meta]) -> Result<Option<Field>, Error> {
+ if let Some(mut field) = Field::new(attrs, None)? {
+ if let Some(attr) = attrs.iter().find(|attr| Label::from_attr(attr).is_some()) {
+ bail!(
+ "invalid attribute for oneof field: {}",
+ attr.path().into_token_stream()
+ );
+ }
+ field.label = Label::Required;
+ Ok(Some(field))
+ } else {
+ Ok(None)
+ }
+ }
+
+ pub fn encode(&self, ident: TokenStream) -> TokenStream {
+ let tag = self.tag;
+ match self.label {
+ Label::Optional => quote! {
+ if let Some(ref msg) = #ident {
+ ::prost::encoding::message::encode(#tag, msg, buf);
+ }
+ },
+ Label::Required => quote! {
+ ::prost::encoding::message::encode(#tag, &#ident, buf);
+ },
+ Label::Repeated => quote! {
+ for msg in &#ident {
+ ::prost::encoding::message::encode(#tag, msg, buf);
+ }
+ },
+ }
+ }
+
+ pub fn merge(&self, ident: TokenStream) -> TokenStream {
+ match self.label {
+ Label::Optional => quote! {
+ ::prost::encoding::message::merge(wire_type,
+ #ident.get_or_insert_with(Default::default),
+ buf,
+ ctx)
+ },
+ Label::Required => quote! {
+ ::prost::encoding::message::merge(wire_type, #ident, buf, ctx)
+ },
+ Label::Repeated => quote! {
+ ::prost::encoding::message::merge_repeated(wire_type, #ident, buf, ctx)
+ },
+ }
+ }
+
+ pub fn encoded_len(&self, ident: TokenStream) -> TokenStream {
+ let tag = self.tag;
+ match self.label {
+ Label::Optional => quote! {
+ #ident.as_ref().map_or(0, |msg| ::prost::encoding::message::encoded_len(#tag, msg))
+ },
+ Label::Required => quote! {
+ ::prost::encoding::message::encoded_len(#tag, &#ident)
+ },
+ Label::Repeated => quote! {
+ ::prost::encoding::message::encoded_len_repeated(#tag, &#ident)
+ },
+ }
+ }
+
+ pub fn clear(&self, ident: TokenStream) -> TokenStream {
+ match self.label {
+ Label::Optional => quote!(#ident = ::core::option::Option::None),
+ Label::Required => quote!(#ident.clear()),
+ Label::Repeated => quote!(#ident.clear()),
+ }
+ }
+}
diff --git a/third_party/rust/prost-derive/src/field/mod.rs b/third_party/rust/prost-derive/src/field/mod.rs
new file mode 100644
index 0000000000..09fef830ef
--- /dev/null
+++ b/third_party/rust/prost-derive/src/field/mod.rs
@@ -0,0 +1,366 @@
+mod group;
+mod map;
+mod message;
+mod oneof;
+mod scalar;
+
+use std::fmt;
+use std::slice;
+
+use anyhow::{bail, Error};
+use proc_macro2::TokenStream;
+use quote::quote;
+use syn::{Attribute, Ident, Lit, LitBool, Meta, MetaList, MetaNameValue, NestedMeta};
+
+#[derive(Clone)]
+pub enum Field {
+ /// A scalar field.
+ Scalar(scalar::Field),
+ /// A message field.
+ Message(message::Field),
+ /// A map field.
+ Map(map::Field),
+ /// A oneof field.
+ Oneof(oneof::Field),
+ /// A group field.
+ Group(group::Field),
+}
+
+impl Field {
+ /// Creates a new `Field` from an iterator of field attributes.
+ ///
+ /// If the meta items are invalid, an error will be returned.
+ /// If the field should be ignored, `None` is returned.
+ pub fn new(attrs: Vec<Attribute>, inferred_tag: Option<u32>) -> Result<Option<Field>, Error> {
+ let attrs = prost_attrs(attrs);
+
+ // TODO: check for ignore attribute.
+
+ let field = if let Some(field) = scalar::Field::new(&attrs, inferred_tag)? {
+ Field::Scalar(field)
+ } else if let Some(field) = message::Field::new(&attrs, inferred_tag)? {
+ Field::Message(field)
+ } else if let Some(field) = map::Field::new(&attrs, inferred_tag)? {
+ Field::Map(field)
+ } else if let Some(field) = oneof::Field::new(&attrs)? {
+ Field::Oneof(field)
+ } else if let Some(field) = group::Field::new(&attrs, inferred_tag)? {
+ Field::Group(field)
+ } else {
+ bail!("no type attribute");
+ };
+
+ Ok(Some(field))
+ }
+
+ /// Creates a new oneof `Field` from an iterator of field attributes.
+ ///
+ /// If the meta items are invalid, an error will be returned.
+ /// If the field should be ignored, `None` is returned.
+ pub fn new_oneof(attrs: Vec<Attribute>) -> Result<Option<Field>, Error> {
+ let attrs = prost_attrs(attrs);
+
+ // TODO: check for ignore attribute.
+
+ let field = if let Some(field) = scalar::Field::new_oneof(&attrs)? {
+ Field::Scalar(field)
+ } else if let Some(field) = message::Field::new_oneof(&attrs)? {
+ Field::Message(field)
+ } else if let Some(field) = map::Field::new_oneof(&attrs)? {
+ Field::Map(field)
+ } else if let Some(field) = group::Field::new_oneof(&attrs)? {
+ Field::Group(field)
+ } else {
+ bail!("no type attribute for oneof field");
+ };
+
+ Ok(Some(field))
+ }
+
+ pub fn tags(&self) -> Vec<u32> {
+ match *self {
+ Field::Scalar(ref scalar) => vec![scalar.tag],
+ Field::Message(ref message) => vec![message.tag],
+ Field::Map(ref map) => vec![map.tag],
+ Field::Oneof(ref oneof) => oneof.tags.clone(),
+ Field::Group(ref group) => vec![group.tag],
+ }
+ }
+
+ /// Returns a statement which encodes the field.
+ pub fn encode(&self, ident: TokenStream) -> TokenStream {
+ match *self {
+ Field::Scalar(ref scalar) => scalar.encode(ident),
+ Field::Message(ref message) => message.encode(ident),
+ Field::Map(ref map) => map.encode(ident),
+ Field::Oneof(ref oneof) => oneof.encode(ident),
+ Field::Group(ref group) => group.encode(ident),
+ }
+ }
+
+ /// Returns an expression which evaluates to the result of merging a decoded
+ /// value into the field.
+ pub fn merge(&self, ident: TokenStream) -> TokenStream {
+ match *self {
+ Field::Scalar(ref scalar) => scalar.merge(ident),
+ Field::Message(ref message) => message.merge(ident),
+ Field::Map(ref map) => map.merge(ident),
+ Field::Oneof(ref oneof) => oneof.merge(ident),
+ Field::Group(ref group) => group.merge(ident),
+ }
+ }
+
+ /// Returns an expression which evaluates to the encoded length of the field.
+ pub fn encoded_len(&self, ident: TokenStream) -> TokenStream {
+ match *self {
+ Field::Scalar(ref scalar) => scalar.encoded_len(ident),
+ Field::Map(ref map) => map.encoded_len(ident),
+ Field::Message(ref msg) => msg.encoded_len(ident),
+ Field::Oneof(ref oneof) => oneof.encoded_len(ident),
+ Field::Group(ref group) => group.encoded_len(ident),
+ }
+ }
+
+ /// Returns a statement which clears the field.
+ pub fn clear(&self, ident: TokenStream) -> TokenStream {
+ match *self {
+ Field::Scalar(ref scalar) => scalar.clear(ident),
+ Field::Message(ref message) => message.clear(ident),
+ Field::Map(ref map) => map.clear(ident),
+ Field::Oneof(ref oneof) => oneof.clear(ident),
+ Field::Group(ref group) => group.clear(ident),
+ }
+ }
+
+ pub fn default(&self) -> TokenStream {
+ match *self {
+ Field::Scalar(ref scalar) => scalar.default(),
+ _ => quote!(::core::default::Default::default()),
+ }
+ }
+
+ /// Produces the fragment implementing debug for the given field.
+ pub fn debug(&self, ident: TokenStream) -> TokenStream {
+ match *self {
+ Field::Scalar(ref scalar) => {
+ let wrapper = scalar.debug(quote!(ScalarWrapper));
+ quote! {
+ {
+ #wrapper
+ ScalarWrapper(&#ident)
+ }
+ }
+ }
+ Field::Map(ref map) => {
+ let wrapper = map.debug(quote!(MapWrapper));
+ quote! {
+ {
+ #wrapper
+ MapWrapper(&#ident)
+ }
+ }
+ }
+ _ => quote!(&#ident),
+ }
+ }
+
+ pub fn methods(&self, ident: &Ident) -> Option<TokenStream> {
+ match *self {
+ Field::Scalar(ref scalar) => scalar.methods(ident),
+ Field::Map(ref map) => map.methods(ident),
+ _ => None,
+ }
+ }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub enum Label {
+ /// An optional field.
+ Optional,
+ /// A required field.
+ Required,
+ /// A repeated field.
+ Repeated,
+}
+
+impl Label {
+ fn as_str(self) -> &'static str {
+ match self {
+ Label::Optional => "optional",
+ Label::Required => "required",
+ Label::Repeated => "repeated",
+ }
+ }
+
+ fn variants() -> slice::Iter<'static, Label> {
+ const VARIANTS: &[Label] = &[Label::Optional, Label::Required, Label::Repeated];
+ VARIANTS.iter()
+ }
+
+ /// Parses a string into a field label.
+ /// If the string doesn't match a field label, `None` is returned.
+ fn from_attr(attr: &Meta) -> Option<Label> {
+ if let Meta::Path(ref path) = *attr {
+ for &label in Label::variants() {
+ if path.is_ident(label.as_str()) {
+ return Some(label);
+ }
+ }
+ }
+ None
+ }
+}
+
+impl fmt::Debug for Label {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(self.as_str())
+ }
+}
+
+impl fmt::Display for Label {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(self.as_str())
+ }
+}
+
+/// Get the items belonging to the 'prost' list attribute, e.g. `#[prost(foo, bar="baz")]`.
+fn prost_attrs(attrs: Vec<Attribute>) -> Vec<Meta> {
+ attrs
+ .iter()
+ .flat_map(Attribute::parse_meta)
+ .flat_map(|meta| match meta {
+ Meta::List(MetaList { path, nested, .. }) => {
+ if path.is_ident("prost") {
+ nested.into_iter().collect()
+ } else {
+ Vec::new()
+ }
+ }
+ _ => Vec::new(),
+ })
+ .flat_map(|attr| -> Result<_, _> {
+ match attr {
+ NestedMeta::Meta(attr) => Ok(attr),
+ NestedMeta::Lit(lit) => bail!("invalid prost attribute: {:?}", lit),
+ }
+ })
+ .collect()
+}
+
+pub fn set_option<T>(option: &mut Option<T>, value: T, message: &str) -> Result<(), Error>
+where
+ T: fmt::Debug,
+{
+ if let Some(ref existing) = *option {
+ bail!("{}: {:?} and {:?}", message, existing, value);
+ }
+ *option = Some(value);
+ Ok(())
+}
+
+pub fn set_bool(b: &mut bool, message: &str) -> Result<(), Error> {
+ if *b {
+ bail!("{}", message);
+ } else {
+ *b = true;
+ Ok(())
+ }
+}
+
+/// Unpacks an attribute into a (key, boolean) pair, returning the boolean value.
+/// If the key doesn't match the attribute, `None` is returned.
+fn bool_attr(key: &str, attr: &Meta) -> Result<Option<bool>, Error> {
+ if !attr.path().is_ident(key) {
+ return Ok(None);
+ }
+ match *attr {
+ Meta::Path(..) => Ok(Some(true)),
+ Meta::List(ref meta_list) => {
+ // TODO(rustlang/rust#23121): slice pattern matching would make this much nicer.
+ if meta_list.nested.len() == 1 {
+ if let NestedMeta::Lit(Lit::Bool(LitBool { value, .. })) = meta_list.nested[0] {
+ return Ok(Some(value));
+ }
+ }
+ bail!("invalid {} attribute", key);
+ }
+ Meta::NameValue(MetaNameValue {
+ lit: Lit::Str(ref lit),
+ ..
+ }) => lit
+ .value()
+ .parse::<bool>()
+ .map_err(Error::from)
+ .map(Option::Some),
+ Meta::NameValue(MetaNameValue {
+ lit: Lit::Bool(LitBool { value, .. }),
+ ..
+ }) => Ok(Some(value)),
+ _ => bail!("invalid {} attribute", key),
+ }
+}
+
+/// Checks if an attribute matches a word.
+fn word_attr(key: &str, attr: &Meta) -> bool {
+ if let Meta::Path(ref path) = *attr {
+ path.is_ident(key)
+ } else {
+ false
+ }
+}
+
+pub(super) fn tag_attr(attr: &Meta) -> Result<Option<u32>, Error> {
+ if !attr.path().is_ident("tag") {
+ return Ok(None);
+ }
+ match *attr {
+ Meta::List(ref meta_list) => {
+ // TODO(rustlang/rust#23121): slice pattern matching would make this much nicer.
+ if meta_list.nested.len() == 1 {
+ if let NestedMeta::Lit(Lit::Int(ref lit)) = meta_list.nested[0] {
+ return Ok(Some(lit.base10_parse()?));
+ }
+ }
+ bail!("invalid tag attribute: {:?}", attr);
+ }
+ Meta::NameValue(ref meta_name_value) => match meta_name_value.lit {
+ Lit::Str(ref lit) => lit
+ .value()
+ .parse::<u32>()
+ .map_err(Error::from)
+ .map(Option::Some),
+ Lit::Int(ref lit) => Ok(Some(lit.base10_parse()?)),
+ _ => bail!("invalid tag attribute: {:?}", attr),
+ },
+ _ => bail!("invalid tag attribute: {:?}", attr),
+ }
+}
+
+fn tags_attr(attr: &Meta) -> Result<Option<Vec<u32>>, Error> {
+ if !attr.path().is_ident("tags") {
+ return Ok(None);
+ }
+ match *attr {
+ Meta::List(ref meta_list) => {
+ let mut tags = Vec::with_capacity(meta_list.nested.len());
+ for item in &meta_list.nested {
+ if let NestedMeta::Lit(Lit::Int(ref lit)) = *item {
+ tags.push(lit.base10_parse()?);
+ } else {
+ bail!("invalid tag attribute: {:?}", attr);
+ }
+ }
+ Ok(Some(tags))
+ }
+ Meta::NameValue(MetaNameValue {
+ lit: Lit::Str(ref lit),
+ ..
+ }) => lit
+ .value()
+ .split(',')
+ .map(|s| s.trim().parse::<u32>().map_err(Error::from))
+ .collect::<Result<Vec<u32>, _>>()
+ .map(Some),
+ _ => bail!("invalid tag attribute: {:?}", attr),
+ }
+}
diff --git a/third_party/rust/prost-derive/src/field/oneof.rs b/third_party/rust/prost-derive/src/field/oneof.rs
new file mode 100644
index 0000000000..7e7f08671c
--- /dev/null
+++ b/third_party/rust/prost-derive/src/field/oneof.rs
@@ -0,0 +1,99 @@
+use anyhow::{bail, Error};
+use proc_macro2::TokenStream;
+use quote::quote;
+use syn::{parse_str, Lit, Meta, MetaNameValue, NestedMeta, Path};
+
+use crate::field::{set_option, tags_attr};
+
+#[derive(Clone)]
+pub struct Field {
+ pub ty: Path,
+ pub tags: Vec<u32>,
+}
+
+impl Field {
+ pub fn new(attrs: &[Meta]) -> Result<Option<Field>, Error> {
+ let mut ty = None;
+ let mut tags = None;
+ let mut unknown_attrs = Vec::new();
+
+ for attr in attrs {
+ if attr.path().is_ident("oneof") {
+ let t = match *attr {
+ Meta::NameValue(MetaNameValue {
+ lit: Lit::Str(ref lit),
+ ..
+ }) => parse_str::<Path>(&lit.value())?,
+ Meta::List(ref list) if list.nested.len() == 1 => {
+ // TODO(rustlang/rust#23121): slice pattern matching would make this much nicer.
+ if let NestedMeta::Meta(Meta::Path(ref path)) = list.nested[0] {
+ if let Some(ident) = path.get_ident() {
+ Path::from(ident.clone())
+ } else {
+ bail!("invalid oneof attribute: item must be an identifier");
+ }
+ } else {
+ bail!("invalid oneof attribute: item must be an identifier");
+ }
+ }
+ _ => bail!("invalid oneof attribute: {:?}", attr),
+ };
+ set_option(&mut ty, t, "duplicate oneof attribute")?;
+ } else if let Some(t) = tags_attr(attr)? {
+ set_option(&mut tags, t, "duplicate tags attributes")?;
+ } else {
+ unknown_attrs.push(attr);
+ }
+ }
+
+ let ty = match ty {
+ Some(ty) => ty,
+ None => return Ok(None),
+ };
+
+ match unknown_attrs.len() {
+ 0 => (),
+ 1 => bail!(
+ "unknown attribute for message field: {:?}",
+ unknown_attrs[0]
+ ),
+ _ => bail!("unknown attributes for message field: {:?}", unknown_attrs),
+ }
+
+ let tags = match tags {
+ Some(tags) => tags,
+ None => bail!("oneof field is missing a tags attribute"),
+ };
+
+ Ok(Some(Field { ty, tags }))
+ }
+
+ /// Returns a statement which encodes the oneof field.
+ pub fn encode(&self, ident: TokenStream) -> TokenStream {
+ quote! {
+ if let Some(ref oneof) = #ident {
+ oneof.encode(buf)
+ }
+ }
+ }
+
+ /// Returns an expression which evaluates to the result of decoding the oneof field.
+ pub fn merge(&self, ident: TokenStream) -> TokenStream {
+ let ty = &self.ty;
+ quote! {
+ #ty::merge(#ident, tag, wire_type, buf, ctx)
+ }
+ }
+
+ /// Returns an expression which evaluates to the encoded length of the oneof field.
+ pub fn encoded_len(&self, ident: TokenStream) -> TokenStream {
+ let ty = &self.ty;
+ quote! {
+ #ident.as_ref().map_or(0, #ty::encoded_len)
+ }
+ }
+
+ pub fn clear(&self, ident: TokenStream) -> TokenStream {
+ quote!(#ident = ::core::option::Option::None)
+ }
+}
diff --git a/third_party/rust/prost-derive/src/field/scalar.rs b/third_party/rust/prost-derive/src/field/scalar.rs
new file mode 100644
index 0000000000..75a4fe3a86
--- /dev/null
+++ b/third_party/rust/prost-derive/src/field/scalar.rs
@@ -0,0 +1,810 @@
+use std::convert::TryFrom;
+use std::fmt;
+
+use anyhow::{anyhow, bail, Error};
+use proc_macro2::{Span, TokenStream};
+use quote::{quote, ToTokens, TokenStreamExt};
+use syn::{parse_str, Ident, Lit, LitByteStr, Meta, MetaList, MetaNameValue, NestedMeta, Path};
+
+use crate::field::{bool_attr, set_option, tag_attr, Label};
+
+/// A scalar protobuf field.
+#[derive(Clone)]
+pub struct Field {
+ pub ty: Ty,
+ pub kind: Kind,
+ pub tag: u32,
+}
+
+impl Field {
+ pub fn new(attrs: &[Meta], inferred_tag: Option<u32>) -> Result<Option<Field>, Error> {
+ let mut ty = None;
+ let mut label = None;
+ let mut packed = None;
+ let mut default = None;
+ let mut tag = None;
+
+ let mut unknown_attrs = Vec::new();
+
+ for attr in attrs {
+ if let Some(t) = Ty::from_attr(attr)? {
+ set_option(&mut ty, t, "duplicate type attributes")?;
+ } else if let Some(p) = bool_attr("packed", attr)? {
+ set_option(&mut packed, p, "duplicate packed attributes")?;
+ } else if let Some(t) = tag_attr(attr)? {
+ set_option(&mut tag, t, "duplicate tag attributes")?;
+ } else if let Some(l) = Label::from_attr(attr) {
+ set_option(&mut label, l, "duplicate label attributes")?;
+ } else if let Some(d) = DefaultValue::from_attr(attr)? {
+ set_option(&mut default, d, "duplicate default attributes")?;
+ } else {
+ unknown_attrs.push(attr);
+ }
+ }
+
+ let ty = match ty {
+ Some(ty) => ty,
+ None => return Ok(None),
+ };
+
+ match unknown_attrs.len() {
+ 0 => (),
+ 1 => bail!("unknown attribute: {:?}", unknown_attrs[0]),
+ _ => bail!("unknown attributes: {:?}", unknown_attrs),
+ }
+
+ let tag = match tag.or(inferred_tag) {
+ Some(tag) => tag,
+ None => bail!("missing tag attribute"),
+ };
+
+ let has_default = default.is_some();
+ let default = default.map_or_else(
+ || Ok(DefaultValue::new(&ty)),
+ |lit| DefaultValue::from_lit(&ty, lit),
+ )?;
+
+ let kind = match (label, packed, has_default) {
+ (None, Some(true), _)
+ | (Some(Label::Optional), Some(true), _)
+ | (Some(Label::Required), Some(true), _) => {
+ bail!("packed attribute may only be applied to repeated fields");
+ }
+ (Some(Label::Repeated), Some(true), _) if !ty.is_numeric() => {
+ bail!("packed attribute may only be applied to numeric types");
+ }
+ (Some(Label::Repeated), _, true) => {
+ bail!("repeated fields may not have a default value");
+ }
+
+ (None, _, _) => Kind::Plain(default),
+ (Some(Label::Optional), _, _) => Kind::Optional(default),
+ (Some(Label::Required), _, _) => Kind::Required(default),
+ (Some(Label::Repeated), packed, false) if packed.unwrap_or_else(|| ty.is_numeric()) => {
+ Kind::Packed
+ }
+ (Some(Label::Repeated), _, false) => Kind::Repeated,
+ };
+
+ Ok(Some(Field { ty, kind, tag }))
+ }
+
+ pub fn new_oneof(attrs: &[Meta]) -> Result<Option<Field>, Error> {
+ if let Some(mut field) = Field::new(attrs, None)? {
+ match field.kind {
+ Kind::Plain(default) => {
+ field.kind = Kind::Required(default);
+ Ok(Some(field))
+ }
+ Kind::Optional(..) => bail!("invalid optional attribute on oneof field"),
+ Kind::Required(..) => bail!("invalid required attribute on oneof field"),
+ Kind::Packed | Kind::Repeated => bail!("invalid repeated attribute on oneof field"),
+ }
+ } else {
+ Ok(None)
+ }
+ }
+
+ pub fn encode(&self, ident: TokenStream) -> TokenStream {
+ let module = self.ty.module();
+ let encode_fn = match self.kind {
+ Kind::Plain(..) | Kind::Optional(..) | Kind::Required(..) => quote!(encode),
+ Kind::Repeated => quote!(encode_repeated),
+ Kind::Packed => quote!(encode_packed),
+ };
+ let encode_fn = quote!(::prost::encoding::#module::#encode_fn);
+ let tag = self.tag;
+
+ match self.kind {
+ Kind::Plain(ref default) => {
+ let default = default.typed();
+ quote! {
+ if #ident != #default {
+ #encode_fn(#tag, &#ident, buf);
+ }
+ }
+ }
+ Kind::Optional(..) => quote! {
+ if let ::core::option::Option::Some(ref value) = #ident {
+ #encode_fn(#tag, value, buf);
+ }
+ },
+ Kind::Required(..) | Kind::Repeated | Kind::Packed => quote! {
+ #encode_fn(#tag, &#ident, buf);
+ },
+ }
+ }
+
+ /// Returns an expression which evaluates to the result of merging a decoded
+ /// scalar value into the field.
+ pub fn merge(&self, ident: TokenStream) -> TokenStream {
+ let module = self.ty.module();
+ let merge_fn = match self.kind {
+ Kind::Plain(..) | Kind::Optional(..) | Kind::Required(..) => quote!(merge),
+ Kind::Repeated | Kind::Packed => quote!(merge_repeated),
+ };
+ let merge_fn = quote!(::prost::encoding::#module::#merge_fn);
+
+ match self.kind {
+ Kind::Plain(..) | Kind::Required(..) | Kind::Repeated | Kind::Packed => quote! {
+ #merge_fn(wire_type, #ident, buf, ctx)
+ },
+ Kind::Optional(..) => quote! {
+ #merge_fn(wire_type,
+ #ident.get_or_insert_with(Default::default),
+ buf,
+ ctx)
+ },
+ }
+ }
+
+ /// Returns an expression which evaluates to the encoded length of the field.
+ pub fn encoded_len(&self, ident: TokenStream) -> TokenStream {
+ let module = self.ty.module();
+ let encoded_len_fn = match self.kind {
+ Kind::Plain(..) | Kind::Optional(..) | Kind::Required(..) => quote!(encoded_len),
+ Kind::Repeated => quote!(encoded_len_repeated),
+ Kind::Packed => quote!(encoded_len_packed),
+ };
+ let encoded_len_fn = quote!(::prost::encoding::#module::#encoded_len_fn);
+ let tag = self.tag;
+
+ match self.kind {
+ Kind::Plain(ref default) => {
+ let default = default.typed();
+ quote! {
+ if #ident != #default {
+ #encoded_len_fn(#tag, &#ident)
+ } else {
+ 0
+ }
+ }
+ }
+ Kind::Optional(..) => quote! {
+ #ident.as_ref().map_or(0, |value| #encoded_len_fn(#tag, value))
+ },
+ Kind::Required(..) | Kind::Repeated | Kind::Packed => quote! {
+ #encoded_len_fn(#tag, &#ident)
+ },
+ }
+ }
+
+ pub fn clear(&self, ident: TokenStream) -> TokenStream {
+ match self.kind {
+ Kind::Plain(ref default) | Kind::Required(ref default) => {
+ let default = default.typed();
+ match self.ty {
+ Ty::String | Ty::Bytes(..) => quote!(#ident.clear()),
+ _ => quote!(#ident = #default),
+ }
+ }
+ Kind::Optional(_) => quote!(#ident = ::core::option::Option::None),
+ Kind::Repeated | Kind::Packed => quote!(#ident.clear()),
+ }
+ }
+
+ /// Returns an expression which evaluates to the default value of the field.
+ pub fn default(&self) -> TokenStream {
+ match self.kind {
+ Kind::Plain(ref value) | Kind::Required(ref value) => value.owned(),
+ Kind::Optional(_) => quote!(::core::option::Option::None),
+ Kind::Repeated | Kind::Packed => quote!(::prost::alloc::vec::Vec::new()),
+ }
+ }
+
+ /// An inner debug wrapper, around the base type.
+ fn debug_inner(&self, wrap_name: TokenStream) -> TokenStream {
+ if let Ty::Enumeration(ref ty) = self.ty {
+ quote! {
+ struct #wrap_name<'a>(&'a i32);
+ impl<'a> ::core::fmt::Debug for #wrap_name<'a> {
+ fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ match #ty::from_i32(*self.0) {
+ None => ::core::fmt::Debug::fmt(&self.0, f),
+ Some(en) => ::core::fmt::Debug::fmt(&en, f),
+ }
+ }
+ }
+ }
+ } else {
+ quote! {
+ fn #wrap_name<T>(v: T) -> T { v }
+ }
+ }
+ }
+
+ /// Returns a fragment for formatting the field `ident` in `Debug`.
+ pub fn debug(&self, wrapper_name: TokenStream) -> TokenStream {
+ let wrapper = self.debug_inner(quote!(Inner));
+ let inner_ty = self.ty.rust_type();
+ match self.kind {
+ Kind::Plain(_) | Kind::Required(_) => self.debug_inner(wrapper_name),
+ Kind::Optional(_) => quote! {
+ struct #wrapper_name<'a>(&'a ::core::option::Option<#inner_ty>);
+ impl<'a> ::core::fmt::Debug for #wrapper_name<'a> {
+ fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ #wrapper
+ ::core::fmt::Debug::fmt(&self.0.as_ref().map(Inner), f)
+ }
+ }
+ },
+ Kind::Repeated | Kind::Packed => {
+ quote! {
+ struct #wrapper_name<'a>(&'a ::prost::alloc::vec::Vec<#inner_ty>);
+ impl<'a> ::core::fmt::Debug for #wrapper_name<'a> {
+ fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ let mut vec_builder = f.debug_list();
+ for v in self.0 {
+ #wrapper
+ vec_builder.entry(&Inner(v));
+ }
+ vec_builder.finish()
+ }
+ }
+ }
+ }
+ }
+ }
+
+ /// Returns methods to embed in the message.
+ pub fn methods(&self, ident: &Ident) -> Option<TokenStream> {
+ let mut ident_str = ident.to_string();
+ if ident_str.starts_with("r#") {
+ ident_str = ident_str[2..].to_owned();
+ }
+
+ if let Ty::Enumeration(ref ty) = self.ty {
+ let set = Ident::new(&format!("set_{}", ident_str), Span::call_site());
+ let set_doc = format!("Sets `{}` to the provided enum value.", ident_str);
+ Some(match self.kind {
+ Kind::Plain(ref default) | Kind::Required(ref default) => {
+ let get_doc = format!(
+ "Returns the enum value of `{}`, \
+ or the default if the field is set to an invalid enum value.",
+ ident_str,
+ );
+ quote! {
+ #[doc=#get_doc]
+ pub fn #ident(&self) -> #ty {
+ #ty::from_i32(self.#ident).unwrap_or(#default)
+ }
+
+ #[doc=#set_doc]
+ pub fn #set(&mut self, value: #ty) {
+ self.#ident = value as i32;
+ }
+ }
+ }
+ Kind::Optional(ref default) => {
+ let get_doc = format!(
+ "Returns the enum value of `{}`, \
+ or the default if the field is unset or set to an invalid enum value.",
+ ident_str,
+ );
+ quote! {
+ #[doc=#get_doc]
+ pub fn #ident(&self) -> #ty {
+ self.#ident.and_then(#ty::from_i32).unwrap_or(#default)
+ }
+
+ #[doc=#set_doc]
+ pub fn #set(&mut self, value: #ty) {
+ self.#ident = ::core::option::Option::Some(value as i32);
+ }
+ }
+ }
+ Kind::Repeated | Kind::Packed => {
+ let iter_doc = format!(
+ "Returns an iterator which yields the valid enum values contained in `{}`.",
+ ident_str,
+ );
+ let push = Ident::new(&format!("push_{}", ident_str), Span::call_site());
+ let push_doc = format!("Appends the provided enum value to `{}`.", ident_str);
+ quote! {
+ #[doc=#iter_doc]
+ pub fn #ident(&self) -> ::core::iter::FilterMap<
+ ::core::iter::Cloned<::core::slice::Iter<i32>>,
+ fn(i32) -> ::core::option::Option<#ty>,
+ > {
+ self.#ident.iter().cloned().filter_map(#ty::from_i32)
+ }
+ #[doc=#push_doc]
+ pub fn #push(&mut self, value: #ty) {
+ self.#ident.push(value as i32);
+ }
+ }
+ }
+ })
+ } else if let Kind::Optional(ref default) = self.kind {
+ let ty = self.ty.rust_ref_type();
+
+ let match_some = if self.ty.is_numeric() {
+ quote!(::core::option::Option::Some(val) => val,)
+ } else {
+ quote!(::core::option::Option::Some(ref val) => &val[..],)
+ };
+
+ let get_doc = format!(
+ "Returns the value of `{0}`, or the default value if `{0}` is unset.",
+ ident_str,
+ );
+
+ Some(quote! {
+ #[doc=#get_doc]
+ pub fn #ident(&self) -> #ty {
+ match self.#ident {
+ #match_some
+ ::core::option::Option::None => #default,
+ }
+ }
+ })
+ } else {
+ None
+ }
+ }
+}
+
+/// A scalar protobuf field type.
+#[derive(Clone, PartialEq, Eq)]
+pub enum Ty {
+ Double,
+ Float,
+ Int32,
+ Int64,
+ Uint32,
+ Uint64,
+ Sint32,
+ Sint64,
+ Fixed32,
+ Fixed64,
+ Sfixed32,
+ Sfixed64,
+ Bool,
+ String,
+ Bytes(BytesTy),
+ Enumeration(Path),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum BytesTy {
+ Vec,
+ Bytes,
+}
+
+impl BytesTy {
+ fn try_from_str(s: &str) -> Result<Self, Error> {
+ match s {
+ "vec" => Ok(BytesTy::Vec),
+ "bytes" => Ok(BytesTy::Bytes),
+ _ => bail!("Invalid bytes type: {}", s),
+ }
+ }
+
+ fn rust_type(&self) -> TokenStream {
+ match self {
+ BytesTy::Vec => quote! { ::prost::alloc::vec::Vec<u8> },
+ BytesTy::Bytes => quote! { ::prost::bytes::Bytes },
+ }
+ }
+}
+
+impl Ty {
+ pub fn from_attr(attr: &Meta) -> Result<Option<Ty>, Error> {
+ let ty = match *attr {
+ Meta::Path(ref name) if name.is_ident("float") => Ty::Float,
+ Meta::Path(ref name) if name.is_ident("double") => Ty::Double,
+ Meta::Path(ref name) if name.is_ident("int32") => Ty::Int32,
+ Meta::Path(ref name) if name.is_ident("int64") => Ty::Int64,
+ Meta::Path(ref name) if name.is_ident("uint32") => Ty::Uint32,
+ Meta::Path(ref name) if name.is_ident("uint64") => Ty::Uint64,
+ Meta::Path(ref name) if name.is_ident("sint32") => Ty::Sint32,
+ Meta::Path(ref name) if name.is_ident("sint64") => Ty::Sint64,
+ Meta::Path(ref name) if name.is_ident("fixed32") => Ty::Fixed32,
+ Meta::Path(ref name) if name.is_ident("fixed64") => Ty::Fixed64,
+ Meta::Path(ref name) if name.is_ident("sfixed32") => Ty::Sfixed32,
+ Meta::Path(ref name) if name.is_ident("sfixed64") => Ty::Sfixed64,
+ Meta::Path(ref name) if name.is_ident("bool") => Ty::Bool,
+ Meta::Path(ref name) if name.is_ident("string") => Ty::String,
+ Meta::Path(ref name) if name.is_ident("bytes") => Ty::Bytes(BytesTy::Vec),
+ Meta::NameValue(MetaNameValue {
+ ref path,
+ lit: Lit::Str(ref l),
+ ..
+ }) if path.is_ident("bytes") => Ty::Bytes(BytesTy::try_from_str(&l.value())?),
+ Meta::NameValue(MetaNameValue {
+ ref path,
+ lit: Lit::Str(ref l),
+ ..
+ }) if path.is_ident("enumeration") => Ty::Enumeration(parse_str::<Path>(&l.value())?),
+ Meta::List(MetaList {
+ ref path,
+ ref nested,
+ ..
+ }) if path.is_ident("enumeration") => {
+ // TODO(rustlang/rust#23121): slice pattern matching would make this much nicer.
+ if nested.len() == 1 {
+ if let NestedMeta::Meta(Meta::Path(ref path)) = nested[0] {
+ Ty::Enumeration(path.clone())
+ } else {
+ bail!("invalid enumeration attribute: item must be an identifier");
+ }
+ } else {
+ bail!("invalid enumeration attribute: only a single identifier is supported");
+ }
+ }
+ _ => return Ok(None),
+ };
+ Ok(Some(ty))
+ }
+
+ pub fn from_str(s: &str) -> Result<Ty, Error> {
+ let enumeration_len = "enumeration".len();
+ let error = Err(anyhow!("invalid type: {}", s));
+ let ty = match s.trim() {
+ "float" => Ty::Float,
+ "double" => Ty::Double,
+ "int32" => Ty::Int32,
+ "int64" => Ty::Int64,
+ "uint32" => Ty::Uint32,
+ "uint64" => Ty::Uint64,
+ "sint32" => Ty::Sint32,
+ "sint64" => Ty::Sint64,
+ "fixed32" => Ty::Fixed32,
+ "fixed64" => Ty::Fixed64,
+ "sfixed32" => Ty::Sfixed32,
+ "sfixed64" => Ty::Sfixed64,
+ "bool" => Ty::Bool,
+ "string" => Ty::String,
+ "bytes" => Ty::Bytes(BytesTy::Vec),
+ s if s.len() > enumeration_len && &s[..enumeration_len] == "enumeration" => {
+ let s = &s[enumeration_len..].trim();
+ match s.chars().next() {
+ Some('<') | Some('(') => (),
+ _ => return error,
+ }
+ match s.chars().next_back() {
+ Some('>') | Some(')') => (),
+ _ => return error,
+ }
+
+ Ty::Enumeration(parse_str::<Path>(s[1..s.len() - 1].trim())?)
+ }
+ _ => return error,
+ };
+ Ok(ty)
+ }
+
+ /// Returns the type as it appears in protobuf field declarations.
+ pub fn as_str(&self) -> &'static str {
+ match *self {
+ Ty::Double => "double",
+ Ty::Float => "float",
+ Ty::Int32 => "int32",
+ Ty::Int64 => "int64",
+ Ty::Uint32 => "uint32",
+ Ty::Uint64 => "uint64",
+ Ty::Sint32 => "sint32",
+ Ty::Sint64 => "sint64",
+ Ty::Fixed32 => "fixed32",
+ Ty::Fixed64 => "fixed64",
+ Ty::Sfixed32 => "sfixed32",
+ Ty::Sfixed64 => "sfixed64",
+ Ty::Bool => "bool",
+ Ty::String => "string",
+ Ty::Bytes(..) => "bytes",
+ Ty::Enumeration(..) => "enum",
+ }
+ }
+
+ // TODO: rename to 'owned_type'.
+ pub fn rust_type(&self) -> TokenStream {
+ match self {
+ Ty::String => quote!(::prost::alloc::string::String),
+ Ty::Bytes(ty) => ty.rust_type(),
+ _ => self.rust_ref_type(),
+ }
+ }
+
+ // TODO: rename to 'ref_type'
+ pub fn rust_ref_type(&self) -> TokenStream {
+ match *self {
+ Ty::Double => quote!(f64),
+ Ty::Float => quote!(f32),
+ Ty::Int32 => quote!(i32),
+ Ty::Int64 => quote!(i64),
+ Ty::Uint32 => quote!(u32),
+ Ty::Uint64 => quote!(u64),
+ Ty::Sint32 => quote!(i32),
+ Ty::Sint64 => quote!(i64),
+ Ty::Fixed32 => quote!(u32),
+ Ty::Fixed64 => quote!(u64),
+ Ty::Sfixed32 => quote!(i32),
+ Ty::Sfixed64 => quote!(i64),
+ Ty::Bool => quote!(bool),
+ Ty::String => quote!(&str),
+ Ty::Bytes(..) => quote!(&[u8]),
+ Ty::Enumeration(..) => quote!(i32),
+ }
+ }
+
+ pub fn module(&self) -> Ident {
+ match *self {
+ Ty::Enumeration(..) => Ident::new("int32", Span::call_site()),
+ _ => Ident::new(self.as_str(), Span::call_site()),
+ }
+ }
+
+ /// Returns false if the scalar type is length delimited (i.e., `string` or `bytes`).
+ pub fn is_numeric(&self) -> bool {
+ !matches!(self, Ty::String | Ty::Bytes(..))
+ }
+}
+
+impl fmt::Debug for Ty {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(self.as_str())
+ }
+}
+
+impl fmt::Display for Ty {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(self.as_str())
+ }
+}
+
+/// Scalar Protobuf field types.
+#[derive(Clone)]
+pub enum Kind {
+ /// A plain proto3 scalar field.
+ Plain(DefaultValue),
+ /// An optional scalar field.
+ Optional(DefaultValue),
+ /// A required proto2 scalar field.
+ Required(DefaultValue),
+ /// A repeated scalar field.
+ Repeated,
+ /// A packed repeated scalar field.
+ Packed,
+}
+
+/// Scalar Protobuf field default value.
+#[derive(Clone, Debug)]
+pub enum DefaultValue {
+ F64(f64),
+ F32(f32),
+ I32(i32),
+ I64(i64),
+ U32(u32),
+ U64(u64),
+ Bool(bool),
+ String(String),
+ Bytes(Vec<u8>),
+ Enumeration(TokenStream),
+ Path(Path),
+}
+
+impl DefaultValue {
+ pub fn from_attr(attr: &Meta) -> Result<Option<Lit>, Error> {
+ if !attr.path().is_ident("default") {
+ Ok(None)
+ } else if let Meta::NameValue(ref name_value) = *attr {
+ Ok(Some(name_value.lit.clone()))
+ } else {
+ bail!("invalid default value attribute: {:?}", attr)
+ }
+ }
+
+ pub fn from_lit(ty: &Ty, lit: Lit) -> Result<DefaultValue, Error> {
+ let is_i32 = *ty == Ty::Int32 || *ty == Ty::Sint32 || *ty == Ty::Sfixed32;
+ let is_i64 = *ty == Ty::Int64 || *ty == Ty::Sint64 || *ty == Ty::Sfixed64;
+
+ let is_u32 = *ty == Ty::Uint32 || *ty == Ty::Fixed32;
+ let is_u64 = *ty == Ty::Uint64 || *ty == Ty::Fixed64;
+
+ let empty_or_is = |expected, actual: &str| expected == actual || actual.is_empty();
+
+ let default = match lit {
+ Lit::Int(ref lit) if is_i32 && empty_or_is("i32", lit.suffix()) => {
+ DefaultValue::I32(lit.base10_parse()?)
+ }
+ Lit::Int(ref lit) if is_i64 && empty_or_is("i64", lit.suffix()) => {
+ DefaultValue::I64(lit.base10_parse()?)
+ }
+ Lit::Int(ref lit) if is_u32 && empty_or_is("u32", lit.suffix()) => {
+ DefaultValue::U32(lit.base10_parse()?)
+ }
+ Lit::Int(ref lit) if is_u64 && empty_or_is("u64", lit.suffix()) => {
+ DefaultValue::U64(lit.base10_parse()?)
+ }
+
+ Lit::Float(ref lit) if *ty == Ty::Float && empty_or_is("f32", lit.suffix()) => {
+ DefaultValue::F32(lit.base10_parse()?)
+ }
+ Lit::Int(ref lit) if *ty == Ty::Float => DefaultValue::F32(lit.base10_parse()?),
+
+ Lit::Float(ref lit) if *ty == Ty::Double && empty_or_is("f64", lit.suffix()) => {
+ DefaultValue::F64(lit.base10_parse()?)
+ }
+ Lit::Int(ref lit) if *ty == Ty::Double => DefaultValue::F64(lit.base10_parse()?),
+
+ Lit::Bool(ref lit) if *ty == Ty::Bool => DefaultValue::Bool(lit.value),
+ Lit::Str(ref lit) if *ty == Ty::String => DefaultValue::String(lit.value()),
+ Lit::ByteStr(ref lit)
+ if *ty == Ty::Bytes(BytesTy::Bytes) || *ty == Ty::Bytes(BytesTy::Vec) =>
+ {
+ DefaultValue::Bytes(lit.value())
+ }
+
+ Lit::Str(ref lit) => {
+ let value = lit.value();
+ let value = value.trim();
+
+ if let Ty::Enumeration(ref path) = *ty {
+ let variant = Ident::new(value, Span::call_site());
+ return Ok(DefaultValue::Enumeration(quote!(#path::#variant)));
+ }
+
+ // Parse special floating point values.
+ if *ty == Ty::Float {
+ match value {
+ "inf" => {
+ return Ok(DefaultValue::Path(parse_str::<Path>(
+ "::core::f32::INFINITY",
+ )?));
+ }
+ "-inf" => {
+ return Ok(DefaultValue::Path(parse_str::<Path>(
+ "::core::f32::NEG_INFINITY",
+ )?));
+ }
+ "nan" => {
+ return Ok(DefaultValue::Path(parse_str::<Path>("::core::f32::NAN")?));
+ }
+ _ => (),
+ }
+ }
+ if *ty == Ty::Double {
+ match value {
+ "inf" => {
+ return Ok(DefaultValue::Path(parse_str::<Path>(
+ "::core::f64::INFINITY",
+ )?));
+ }
+ "-inf" => {
+ return Ok(DefaultValue::Path(parse_str::<Path>(
+ "::core::f64::NEG_INFINITY",
+ )?));
+ }
+ "nan" => {
+ return Ok(DefaultValue::Path(parse_str::<Path>("::core::f64::NAN")?));
+ }
+ _ => (),
+ }
+ }
+
+ // Rust doesn't have a negative literals, so they have to be parsed specially.
+ if let Some(Ok(lit)) = value.strip_prefix('-').map(syn::parse_str::<Lit>) {
+ match lit {
+ Lit::Int(ref lit) if is_i32 && empty_or_is("i32", lit.suffix()) => {
+ // Initially parse into an i64, so that i32::MIN does not overflow.
+ let value: i64 = -lit.base10_parse()?;
+ return Ok(i32::try_from(value).map(DefaultValue::I32)?);
+ }
+ Lit::Int(ref lit) if is_i64 && empty_or_is("i64", lit.suffix()) => {
+ // Initially parse into an i128, so that i64::MIN does not overflow.
+ let value: i128 = -lit.base10_parse()?;
+ return Ok(i64::try_from(value).map(DefaultValue::I64)?);
+ }
+ Lit::Float(ref lit)
+ if *ty == Ty::Float && empty_or_is("f32", lit.suffix()) =>
+ {
+ return Ok(DefaultValue::F32(-lit.base10_parse()?));
+ }
+ Lit::Float(ref lit)
+ if *ty == Ty::Double && empty_or_is("f64", lit.suffix()) =>
+ {
+ return Ok(DefaultValue::F64(-lit.base10_parse()?));
+ }
+ Lit::Int(ref lit) if *ty == Ty::Float && lit.suffix().is_empty() => {
+ return Ok(DefaultValue::F32(-lit.base10_parse()?));
+ }
+ Lit::Int(ref lit) if *ty == Ty::Double && lit.suffix().is_empty() => {
+ return Ok(DefaultValue::F64(-lit.base10_parse()?));
+ }
+ _ => (),
+ }
+ }
+ match syn::parse_str::<Lit>(&value) {
+ Ok(Lit::Str(_)) => (),
+ Ok(lit) => return DefaultValue::from_lit(ty, lit),
+ _ => (),
+ }
+ bail!("invalid default value: {}", quote!(#value));
+ }
+ _ => bail!("invalid default value: {}", quote!(#lit)),
+ };
+
+ Ok(default)
+ }
+
+ pub fn new(ty: &Ty) -> DefaultValue {
+ match *ty {
+ Ty::Float => DefaultValue::F32(0.0),
+ Ty::Double => DefaultValue::F64(0.0),
+ Ty::Int32 | Ty::Sint32 | Ty::Sfixed32 => DefaultValue::I32(0),
+ Ty::Int64 | Ty::Sint64 | Ty::Sfixed64 => DefaultValue::I64(0),
+ Ty::Uint32 | Ty::Fixed32 => DefaultValue::U32(0),
+ Ty::Uint64 | Ty::Fixed64 => DefaultValue::U64(0),
+
+ Ty::Bool => DefaultValue::Bool(false),
+ Ty::String => DefaultValue::String(String::new()),
+ Ty::Bytes(..) => DefaultValue::Bytes(Vec::new()),
+ Ty::Enumeration(ref path) => DefaultValue::Enumeration(quote!(#path::default())),
+ }
+ }
+
+ pub fn owned(&self) -> TokenStream {
+ match *self {
+ DefaultValue::String(ref value) if value.is_empty() => {
+ quote!(::prost::alloc::string::String::new())
+ }
+ DefaultValue::String(ref value) => quote!(#value.into()),
+ DefaultValue::Bytes(ref value) if value.is_empty() => quote!(Default::default()),
+ DefaultValue::Bytes(ref value) => {
+ let lit = LitByteStr::new(value, Span::call_site());
+ quote!(#lit.as_ref().into())
+ }
+
+ ref other => other.typed(),
+ }
+ }
+
+ pub fn typed(&self) -> TokenStream {
+ if let DefaultValue::Enumeration(_) = *self {
+ quote!(#self as i32)
+ } else {
+ quote!(#self)
+ }
+ }
+}
+
+impl ToTokens for DefaultValue {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ match *self {
+ DefaultValue::F64(value) => value.to_tokens(tokens),
+ DefaultValue::F32(value) => value.to_tokens(tokens),
+ DefaultValue::I32(value) => value.to_tokens(tokens),
+ DefaultValue::I64(value) => value.to_tokens(tokens),
+ DefaultValue::U32(value) => value.to_tokens(tokens),
+ DefaultValue::U64(value) => value.to_tokens(tokens),
+ DefaultValue::Bool(value) => value.to_tokens(tokens),
+ DefaultValue::String(ref value) => value.to_tokens(tokens),
+ DefaultValue::Bytes(ref value) => {
+ let byte_str = LitByteStr::new(value, Span::call_site());
+ tokens.append_all(quote!(#byte_str as &[u8]));
+ }
+ DefaultValue::Enumeration(ref value) => value.to_tokens(tokens),
+ DefaultValue::Path(ref value) => value.to_tokens(tokens),
+ }
+ }
+}
diff --git a/third_party/rust/prost-derive/src/lib.rs b/third_party/rust/prost-derive/src/lib.rs
new file mode 100644
index 0000000000..a517c41e80
--- /dev/null
+++ b/third_party/rust/prost-derive/src/lib.rs
@@ -0,0 +1,470 @@
+#![doc(html_root_url = "https://docs.rs/prost-derive/0.8.0")]
+// The `quote!` macro requires deep recursion.
+#![recursion_limit = "4096"]
+
+extern crate alloc;
+extern crate proc_macro;
+
+use anyhow::{bail, Error};
+use itertools::Itertools;
+use proc_macro::TokenStream;
+use proc_macro2::Span;
+use quote::quote;
+use syn::{
+ punctuated::Punctuated, Data, DataEnum, DataStruct, DeriveInput, Expr, Fields, FieldsNamed,
+ FieldsUnnamed, Ident, Variant,
+};
+
+mod field;
+use crate::field::Field;
+
+fn try_message(input: TokenStream) -> Result<TokenStream, Error> {
+ let input: DeriveInput = syn::parse(input)?;
+
+ let ident = input.ident;
+
+ let variant_data = match input.data {
+ Data::Struct(variant_data) => variant_data,
+ Data::Enum(..) => bail!("Message can not be derived for an enum"),
+ Data::Union(..) => bail!("Message can not be derived for a union"),
+ };
+
+ let generics = &input.generics;
+ let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
+
+ let fields = match variant_data {
+ DataStruct {
+ fields: Fields::Named(FieldsNamed { named: fields, .. }),
+ ..
+ }
+ | DataStruct {
+ fields:
+ Fields::Unnamed(FieldsUnnamed {
+ unnamed: fields, ..
+ }),
+ ..
+ } => fields.into_iter().collect(),
+ DataStruct {
+ fields: Fields::Unit,
+ ..
+ } => Vec::new(),
+ };
+
+ let mut next_tag: u32 = 1;
+ let mut fields = fields
+ .into_iter()
+ .enumerate()
+ .flat_map(|(idx, field)| {
+ let field_ident = field
+ .ident
+ .unwrap_or_else(|| Ident::new(&idx.to_string(), Span::call_site()));
+ match Field::new(field.attrs, Some(next_tag)) {
+ Ok(Some(field)) => {
+ next_tag = field.tags().iter().max().map(|t| t + 1).unwrap_or(next_tag);
+ Some(Ok((field_ident, field)))
+ }
+ Ok(None) => None,
+ Err(err) => Some(Err(
+ err.context(format!("invalid message field {}.{}", ident, field_ident))
+ )),
+ }
+ })
+ .collect::<Result<Vec<_>, _>>()?;
+
+ // We want Debug to be in declaration order
+ let unsorted_fields = fields.clone();
+
+ // Sort the fields by tag number so that fields will be encoded in tag order.
+ // TODO: This encodes oneof fields in the position of their lowest tag,
+ // regardless of the currently occupied variant, is that consequential?
+ // See: https://developers.google.com/protocol-buffers/docs/encoding#order
+ fields.sort_by_key(|&(_, ref field)| field.tags().into_iter().min().unwrap());
+ let fields = fields;
+
+ let mut tags = fields
+ .iter()
+ .flat_map(|&(_, ref field)| field.tags())
+ .collect::<Vec<_>>();
+ let num_tags = tags.len();
+ tags.sort_unstable();
+ tags.dedup();
+ if tags.len() != num_tags {
+ bail!("message {} has fields with duplicate tags", ident);
+ }
+
+ let encoded_len = fields
+ .iter()
+ .map(|&(ref field_ident, ref field)| field.encoded_len(quote!(self.#field_ident)));
+
+ let encode = fields
+ .iter()
+ .map(|&(ref field_ident, ref field)| field.encode(quote!(self.#field_ident)));
+
+ let merge = fields.iter().map(|&(ref field_ident, ref field)| {
+ let merge = field.merge(quote!(value));
+ let tags = field.tags().into_iter().map(|tag| quote!(#tag));
+ let tags = Itertools::intersperse(tags, quote!(|));
+
+ quote! {
+ #(#tags)* => {
+ let mut value = &mut self.#field_ident;
+ #merge.map_err(|mut error| {
+ error.push(STRUCT_NAME, stringify!(#field_ident));
+ error
+ })
+ },
+ }
+ });
+
+ let struct_name = if fields.is_empty() {
+ quote!()
+ } else {
+ quote!(
+ const STRUCT_NAME: &'static str = stringify!(#ident);
+ )
+ };
+
+ // TODO
+ let is_struct = true;
+
+ let clear = fields
+ .iter()
+ .map(|&(ref field_ident, ref field)| field.clear(quote!(self.#field_ident)));
+
+ let default = fields.iter().map(|&(ref field_ident, ref field)| {
+ let value = field.default();
+ quote!(#field_ident: #value,)
+ });
+
+ let methods = fields
+ .iter()
+ .flat_map(|&(ref field_ident, ref field)| field.methods(field_ident))
+ .collect::<Vec<_>>();
+ let methods = if methods.is_empty() {
+ quote!()
+ } else {
+ quote! {
+ #[allow(dead_code)]
+ impl #impl_generics #ident #ty_generics #where_clause {
+ #(#methods)*
+ }
+ }
+ };
+
+ let debugs = unsorted_fields.iter().map(|&(ref field_ident, ref field)| {
+ let wrapper = field.debug(quote!(self.#field_ident));
+ let call = if is_struct {
+ quote!(builder.field(stringify!(#field_ident), &wrapper))
+ } else {
+ quote!(builder.field(&wrapper))
+ };
+ quote! {
+ let builder = {
+ let wrapper = #wrapper;
+ #call
+ };
+ }
+ });
+ let debug_builder = if is_struct {
+ quote!(f.debug_struct(stringify!(#ident)))
+ } else {
+ quote!(f.debug_tuple(stringify!(#ident)))
+ };
+
+ let expanded = quote! {
+ impl #impl_generics ::prost::Message for #ident #ty_generics #where_clause {
+ #[allow(unused_variables)]
+ fn encode_raw<B>(&self, buf: &mut B) where B: ::prost::bytes::BufMut {
+ #(#encode)*
+ }
+
+ #[allow(unused_variables)]
+ fn merge_field<B>(
+ &mut self,
+ tag: u32,
+ wire_type: ::prost::encoding::WireType,
+ buf: &mut B,
+ ctx: ::prost::encoding::DecodeContext,
+ ) -> ::core::result::Result<(), ::prost::DecodeError>
+ where B: ::prost::bytes::Buf {
+ #struct_name
+ match tag {
+ #(#merge)*
+ _ => ::prost::encoding::skip_field(wire_type, tag, buf, ctx),
+ }
+ }
+
+ #[inline]
+ fn encoded_len(&self) -> usize {
+ 0 #(+ #encoded_len)*
+ }
+
+ fn clear(&mut self) {
+ #(#clear;)*
+ }
+ }
+
+ impl #impl_generics Default for #ident #ty_generics #where_clause {
+ fn default() -> Self {
+ #ident {
+ #(#default)*
+ }
+ }
+ }
+
+ impl #impl_generics ::core::fmt::Debug for #ident #ty_generics #where_clause {
+ fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ let mut builder = #debug_builder;
+ #(#debugs;)*
+ builder.finish()
+ }
+ }
+
+ #methods
+ };
+
+ Ok(expanded.into())
+}
+
+#[proc_macro_derive(Message, attributes(prost))]
+pub fn message(input: TokenStream) -> TokenStream {
+ try_message(input).unwrap()
+}
+
+fn try_enumeration(input: TokenStream) -> Result<TokenStream, Error> {
+ let input: DeriveInput = syn::parse(input)?;
+ let ident = input.ident;
+
+ let generics = &input.generics;
+ let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
+
+ let punctuated_variants = match input.data {
+ Data::Enum(DataEnum { variants, .. }) => variants,
+ Data::Struct(_) => bail!("Enumeration can not be derived for a struct"),
+ Data::Union(..) => bail!("Enumeration can not be derived for a union"),
+ };
+
+ // Map the variants into 'fields'.
+ let mut variants: Vec<(Ident, Expr)> = Vec::new();
+ for Variant {
+ ident,
+ fields,
+ discriminant,
+ ..
+ } in punctuated_variants
+ {
+ match fields {
+ Fields::Unit => (),
+ Fields::Named(_) | Fields::Unnamed(_) => {
+ bail!("Enumeration variants may not have fields")
+ }
+ }
+
+ match discriminant {
+ Some((_, expr)) => variants.push((ident, expr)),
+ None => bail!("Enumeration variants must have a disriminant"),
+ }
+ }
+
+ if variants.is_empty() {
+ panic!("Enumeration must have at least one variant");
+ }
+
+ let default = variants[0].0.clone();
+
+ let is_valid = variants
+ .iter()
+ .map(|&(_, ref value)| quote!(#value => true));
+ let from = variants.iter().map(
+ |&(ref variant, ref value)| quote!(#value => ::core::option::Option::Some(#ident::#variant)),
+ );
+
+ let is_valid_doc = format!("Returns `true` if `value` is a variant of `{}`.", ident);
+ let from_i32_doc = format!(
+ "Converts an `i32` to a `{}`, or `None` if `value` is not a valid variant.",
+ ident
+ );
+
+ let expanded = quote! {
+ impl #impl_generics #ident #ty_generics #where_clause {
+ #[doc=#is_valid_doc]
+ pub fn is_valid(value: i32) -> bool {
+ match value {
+ #(#is_valid,)*
+ _ => false,
+ }
+ }
+
+ #[doc=#from_i32_doc]
+ pub fn from_i32(value: i32) -> ::core::option::Option<#ident> {
+ match value {
+ #(#from,)*
+ _ => ::core::option::Option::None,
+ }
+ }
+ }
+
+ impl #impl_generics ::core::default::Default for #ident #ty_generics #where_clause {
+ fn default() -> #ident {
+ #ident::#default
+ }
+ }
+
+ impl #impl_generics ::core::convert::From::<#ident> for i32 #ty_generics #where_clause {
+ fn from(value: #ident) -> i32 {
+ value as i32
+ }
+ }
+ };
+
+ Ok(expanded.into())
+}
+
+#[proc_macro_derive(Enumeration, attributes(prost))]
+pub fn enumeration(input: TokenStream) -> TokenStream {
+ try_enumeration(input).unwrap()
+}
+
+fn try_oneof(input: TokenStream) -> Result<TokenStream, Error> {
+ let input: DeriveInput = syn::parse(input)?;
+
+ let ident = input.ident;
+
+ let variants = match input.data {
+ Data::Enum(DataEnum { variants, .. }) => variants,
+ Data::Struct(..) => bail!("Oneof can not be derived for a struct"),
+ Data::Union(..) => bail!("Oneof can not be derived for a union"),
+ };
+
+ let generics = &input.generics;
+ let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
+
+ // Map the variants into 'fields'.
+ let mut fields: Vec<(Ident, Field)> = Vec::new();
+ for Variant {
+ attrs,
+ ident: variant_ident,
+ fields: variant_fields,
+ ..
+ } in variants
+ {
+ let variant_fields = match variant_fields {
+ Fields::Unit => Punctuated::new(),
+ Fields::Named(FieldsNamed { named: fields, .. })
+ | Fields::Unnamed(FieldsUnnamed {
+ unnamed: fields, ..
+ }) => fields,
+ };
+ if variant_fields.len() != 1 {
+ bail!("Oneof enum variants must have a single field");
+ }
+ match Field::new_oneof(attrs)? {
+ Some(field) => fields.push((variant_ident, field)),
+ None => bail!("invalid oneof variant: oneof variants may not be ignored"),
+ }
+ }
+
+ let mut tags = fields
+ .iter()
+ .flat_map(|&(ref variant_ident, ref field)| -> Result<u32, Error> {
+ if field.tags().len() > 1 {
+ bail!(
+ "invalid oneof variant {}::{}: oneof variants may only have a single tag",
+ ident,
+ variant_ident
+ );
+ }
+ Ok(field.tags()[0])
+ })
+ .collect::<Vec<_>>();
+ tags.sort_unstable();
+ tags.dedup();
+ if tags.len() != fields.len() {
+ panic!("invalid oneof {}: variants have duplicate tags", ident);
+ }
+
+ let encode = fields.iter().map(|&(ref variant_ident, ref field)| {
+ let encode = field.encode(quote!(*value));
+ quote!(#ident::#variant_ident(ref value) => { #encode })
+ });
+
+ let merge = fields.iter().map(|&(ref variant_ident, ref field)| {
+ let tag = field.tags()[0];
+ let merge = field.merge(quote!(value));
+ quote! {
+ #tag => {
+ match field {
+ ::core::option::Option::Some(#ident::#variant_ident(ref mut value)) => {
+ #merge
+ },
+ _ => {
+ let mut owned_value = ::core::default::Default::default();
+ let value = &mut owned_value;
+ #merge.map(|_| *field = ::core::option::Option::Some(#ident::#variant_ident(owned_value)))
+ },
+ }
+ }
+ }
+ });
+
+ let encoded_len = fields.iter().map(|&(ref variant_ident, ref field)| {
+ let encoded_len = field.encoded_len(quote!(*value));
+ quote!(#ident::#variant_ident(ref value) => #encoded_len)
+ });
+
+ let debug = fields.iter().map(|&(ref variant_ident, ref field)| {
+ let wrapper = field.debug(quote!(*value));
+ quote!(#ident::#variant_ident(ref value) => {
+ let wrapper = #wrapper;
+ f.debug_tuple(stringify!(#variant_ident))
+ .field(&wrapper)
+ .finish()
+ })
+ });
+
+ let expanded = quote! {
+ impl #impl_generics #ident #ty_generics #where_clause {
+ pub fn encode<B>(&self, buf: &mut B) where B: ::prost::bytes::BufMut {
+ match *self {
+ #(#encode,)*
+ }
+ }
+
+ pub fn merge<B>(
+ field: &mut ::core::option::Option<#ident #ty_generics>,
+ tag: u32,
+ wire_type: ::prost::encoding::WireType,
+ buf: &mut B,
+ ctx: ::prost::encoding::DecodeContext,
+ ) -> ::core::result::Result<(), ::prost::DecodeError>
+ where B: ::prost::bytes::Buf {
+ match tag {
+ #(#merge,)*
+ _ => unreachable!(concat!("invalid ", stringify!(#ident), " tag: {}"), tag),
+ }
+ }
+
+ #[inline]
+ pub fn encoded_len(&self) -> usize {
+ match *self {
+ #(#encoded_len,)*
+ }
+ }
+ }
+
+ impl #impl_generics ::core::fmt::Debug for #ident #ty_generics #where_clause {
+ fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+ match *self {
+ #(#debug,)*
+ }
+ }
+ }
+ };
+
+ Ok(expanded.into())
+}
+
+#[proc_macro_derive(Oneof, attributes(prost))]
+pub fn oneof(input: TokenStream) -> TokenStream {
+ try_oneof(input).unwrap()
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 11:09:16 +0000