| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/prost-derive-0.9.0/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../prost_derive/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../prost_derive/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="attribute">#![doc(html_root_url = <span class="string">"https://docs.rs/prost-derive/0.9.0"</span>)] |
| </span><span class="comment">// The `quote!` macro requires deep recursion. |
| </span><span class="attribute">#![recursion_limit = <span class="string">"4096"</span>] |
| |
| </span><span class="kw">extern crate </span>alloc; |
| <span class="kw">extern crate </span>proc_macro; |
| |
| <span class="kw">use </span>anyhow::{bail, Error}; |
| <span class="kw">use </span>itertools::Itertools; |
| <span class="kw">use </span>proc_macro::TokenStream; |
| <span class="kw">use </span>proc_macro2::Span; |
| <span class="kw">use </span>quote::quote; |
| <span class="kw">use </span>syn::{ |
| punctuated::Punctuated, Data, DataEnum, DataStruct, DeriveInput, Expr, Fields, FieldsNamed, |
| FieldsUnnamed, Ident, Variant, |
| }; |
| |
| <span class="kw">mod </span>field; |
| <span class="kw">use </span><span class="kw">crate</span>::field::Field; |
| |
| <span class="kw">fn </span>try_message(input: TokenStream) -> <span class="prelude-ty">Result</span><TokenStream, Error> { |
| <span class="kw">let </span>input: DeriveInput = syn::parse(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>ident = input.ident; |
| |
| <span class="kw">let </span>variant_data = <span class="kw">match </span>input.data { |
| Data::Struct(variant_data) => variant_data, |
| Data::Enum(..) => <span class="macro">bail!</span>(<span class="string">"Message can not be derived for an enum"</span>), |
| Data::Union(..) => <span class="macro">bail!</span>(<span class="string">"Message can not be derived for a union"</span>), |
| }; |
| |
| <span class="kw">let </span>generics = <span class="kw-2">&</span>input.generics; |
| <span class="kw">let </span>(impl_generics, ty_generics, where_clause) = generics.split_for_impl(); |
| |
| <span class="kw">let </span>fields = <span class="kw">match </span>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(), |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>next_tag: u32 = <span class="number">1</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>fields = fields |
| .into_iter() |
| .enumerate() |
| .flat_map(|(idx, field)| { |
| <span class="kw">let </span>field_ident = field |
| .ident |
| .unwrap_or_else(|| Ident::new(<span class="kw-2">&</span>idx.to_string(), Span::call_site())); |
| <span class="kw">match </span>Field::new(field.attrs, <span class="prelude-val">Some</span>(next_tag)) { |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(field)) => { |
| next_tag = field.tags().iter().max().map(|t| t + <span class="number">1</span>).unwrap_or(next_tag); |
| <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>((field_ident, field))) |
| } |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) => <span class="prelude-val">None</span>, |
| <span class="prelude-val">Err</span>(err) => <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>( |
| err.context(<span class="macro">format!</span>(<span class="string">"invalid message field {}.{}"</span>, ident, field_ident)) |
| )), |
| } |
| }) |
| .collect::<<span class="prelude-ty">Result</span><Vec<<span class="kw">_</span>>, <span class="kw">_</span>>>()<span class="question-mark">?</span>; |
| |
| <span class="comment">// We want Debug to be in declaration order |
| </span><span class="kw">let </span>unsorted_fields = fields.clone(); |
| |
| <span class="comment">// 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 |
| </span>fields.sort_by_key(|<span class="kw-2">&</span>(<span class="kw">_</span>, <span class="kw-2">ref </span>field)| field.tags().into_iter().min().unwrap()); |
| <span class="kw">let </span>fields = fields; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>tags = fields |
| .iter() |
| .flat_map(|<span class="kw-2">&</span>(<span class="kw">_</span>, <span class="kw-2">ref </span>field)| field.tags()) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">let </span>num_tags = tags.len(); |
| tags.sort_unstable(); |
| tags.dedup(); |
| <span class="kw">if </span>tags.len() != num_tags { |
| <span class="macro">bail!</span>(<span class="string">"message {} has fields with duplicate tags"</span>, ident); |
| } |
| |
| <span class="kw">let </span>encoded_len = fields |
| .iter() |
| .map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| field.encoded_len(<span class="macro">quote!</span>(<span class="self">self</span>.#field_ident))); |
| |
| <span class="kw">let </span>encode = fields |
| .iter() |
| .map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| field.encode(<span class="macro">quote!</span>(<span class="self">self</span>.#field_ident))); |
| |
| <span class="kw">let </span>merge = fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>merge = field.merge(<span class="macro">quote!</span>(value)); |
| <span class="kw">let </span>tags = field.tags().into_iter().map(|tag| <span class="macro">quote!</span>(#tag)); |
| <span class="kw">let </span>tags = Itertools::intersperse(tags, <span class="macro">quote!</span>(|)); |
| |
| <span class="macro">quote! </span>{ |
| #(#tags)* => { |
| <span class="kw">let </span><span class="kw-2">mut </span>value = <span class="kw-2">&mut </span><span class="self">self</span>.#field_ident; |
| #merge.map_err(|<span class="kw-2">mut </span>error| { |
| error.push(STRUCT_NAME, <span class="macro">stringify!</span>(#field_ident)); |
| error |
| }) |
| }, |
| } |
| }); |
| |
| <span class="kw">let </span>struct_name = <span class="kw">if </span>fields.is_empty() { |
| <span class="macro">quote!</span>() |
| } <span class="kw">else </span>{ |
| <span class="macro">quote!</span>( |
| <span class="kw">const </span>STRUCT_NAME: <span class="kw-2">&</span><span class="lifetime">'static </span>str = <span class="macro">stringify!</span>(#ident); |
| ) |
| }; |
| |
| <span class="comment">// TODO |
| </span><span class="kw">let </span>is_struct = <span class="bool-val">true</span>; |
| |
| <span class="kw">let </span>clear = fields |
| .iter() |
| .map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| field.clear(<span class="macro">quote!</span>(<span class="self">self</span>.#field_ident))); |
| |
| <span class="kw">let </span>default = fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>value = field.default(); |
| <span class="macro">quote!</span>(#field_ident: #value,) |
| }); |
| |
| <span class="kw">let </span>methods = fields |
| .iter() |
| .flat_map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| field.methods(field_ident)) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">let </span>methods = <span class="kw">if </span>methods.is_empty() { |
| <span class="macro">quote!</span>() |
| } <span class="kw">else </span>{ |
| <span class="macro">quote! </span>{ |
| <span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">impl </span>#impl_generics #ident #ty_generics #where_clause { |
| #(#methods)* |
| } |
| } |
| }; |
| |
| <span class="kw">let </span>debugs = unsorted_fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>field_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>wrapper = field.debug(<span class="macro">quote!</span>(<span class="self">self</span>.#field_ident)); |
| <span class="kw">let </span>call = <span class="kw">if </span>is_struct { |
| <span class="macro">quote!</span>(builder.field(<span class="macro">stringify!</span>(#field_ident), <span class="kw-2">&</span>wrapper)) |
| } <span class="kw">else </span>{ |
| <span class="macro">quote!</span>(builder.field(<span class="kw-2">&</span>wrapper)) |
| }; |
| <span class="macro">quote! </span>{ |
| <span class="kw">let </span>builder = { |
| <span class="kw">let </span>wrapper = #wrapper; |
| #call |
| }; |
| } |
| }); |
| <span class="kw">let </span>debug_builder = <span class="kw">if </span>is_struct { |
| <span class="macro">quote!</span>(f.debug_struct(<span class="macro">stringify!</span>(#ident))) |
| } <span class="kw">else </span>{ |
| <span class="macro">quote!</span>(f.debug_tuple(<span class="macro">stringify!</span>(#ident))) |
| }; |
| |
| <span class="kw">let </span>expanded = <span class="macro">quote! </span>{ |
| <span class="kw">impl </span>#impl_generics ::prost::Message <span class="kw">for </span>#ident #ty_generics #where_clause { |
| <span class="attribute">#[allow(unused_variables)] |
| </span><span class="kw">fn </span>encode_raw<B>(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>B) <span class="kw">where </span>B: ::prost::bytes::BufMut { |
| #(#encode)* |
| } |
| |
| <span class="attribute">#[allow(unused_variables)] |
| </span><span class="kw">fn </span>merge_field<B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| tag: u32, |
| wire_type: ::prost::encoding::WireType, |
| buf: <span class="kw-2">&mut </span>B, |
| ctx: ::prost::encoding::DecodeContext, |
| ) -> ::core::result::Result<(), ::prost::DecodeError> |
| <span class="kw">where </span>B: ::prost::bytes::Buf { |
| #struct_name |
| <span class="kw">match </span>tag { |
| #(#merge)* |
| <span class="kw">_ </span>=> ::prost::encoding::skip_field(wire_type, tag, buf, ctx), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>encoded_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="number">0 </span>#(+ #encoded_len)* |
| } |
| |
| <span class="kw">fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| #(#clear;)* |
| } |
| } |
| |
| <span class="kw">impl </span>#impl_generics ::core::default::Default <span class="kw">for </span>#ident #ty_generics #where_clause { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| #ident { |
| #(#default)* |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>#impl_generics ::core::fmt::Debug <span class="kw">for </span>#ident #ty_generics #where_clause { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>::core::fmt::Formatter) -> ::core::fmt::Result { |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = #debug_builder; |
| #(#debugs;)* |
| builder.finish() |
| } |
| } |
| |
| #methods |
| }; |
| |
| <span class="prelude-val">Ok</span>(expanded.into()) |
| } |
| |
| <span class="attribute">#[proc_macro_derive(Message, attributes(prost))] |
| </span><span class="kw">pub fn </span>message(input: TokenStream) -> TokenStream { |
| try_message(input).unwrap() |
| } |
| |
| <span class="kw">fn </span>try_enumeration(input: TokenStream) -> <span class="prelude-ty">Result</span><TokenStream, Error> { |
| <span class="kw">let </span>input: DeriveInput = syn::parse(input)<span class="question-mark">?</span>; |
| <span class="kw">let </span>ident = input.ident; |
| |
| <span class="kw">let </span>generics = <span class="kw-2">&</span>input.generics; |
| <span class="kw">let </span>(impl_generics, ty_generics, where_clause) = generics.split_for_impl(); |
| |
| <span class="kw">let </span>punctuated_variants = <span class="kw">match </span>input.data { |
| Data::Enum(DataEnum { variants, .. }) => variants, |
| Data::Struct(<span class="kw">_</span>) => <span class="macro">bail!</span>(<span class="string">"Enumeration can not be derived for a struct"</span>), |
| Data::Union(..) => <span class="macro">bail!</span>(<span class="string">"Enumeration can not be derived for a union"</span>), |
| }; |
| |
| <span class="comment">// Map the variants into 'fields'. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>variants: Vec<(Ident, Expr)> = Vec::new(); |
| <span class="kw">for </span>Variant { |
| ident, |
| fields, |
| discriminant, |
| .. |
| } <span class="kw">in </span>punctuated_variants |
| { |
| <span class="kw">match </span>fields { |
| Fields::Unit => (), |
| Fields::Named(<span class="kw">_</span>) | Fields::Unnamed(<span class="kw">_</span>) => { |
| <span class="macro">bail!</span>(<span class="string">"Enumeration variants may not have fields"</span>) |
| } |
| } |
| |
| <span class="kw">match </span>discriminant { |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, expr)) => variants.push((ident, expr)), |
| <span class="prelude-val">None </span>=> <span class="macro">bail!</span>(<span class="string">"Enumeration variants must have a disriminant"</span>), |
| } |
| } |
| |
| <span class="kw">if </span>variants.is_empty() { |
| <span class="macro">panic!</span>(<span class="string">"Enumeration must have at least one variant"</span>); |
| } |
| |
| <span class="kw">let </span>default = variants[<span class="number">0</span>].<span class="number">0</span>.clone(); |
| |
| <span class="kw">let </span>is_valid = variants |
| .iter() |
| .map(|<span class="kw-2">&</span>(<span class="kw">_</span>, <span class="kw-2">ref </span>value)| <span class="macro">quote!</span>(#value => <span class="bool-val">true</span>)); |
| <span class="kw">let </span>from = variants.iter().map( |
| |<span class="kw-2">&</span>(<span class="kw-2">ref </span>variant, <span class="kw-2">ref </span>value)| <span class="macro">quote!</span>(#value => ::core::option::Option::Some(#ident::#variant)), |
| ); |
| |
| <span class="kw">let </span>is_valid_doc = <span class="macro">format!</span>(<span class="string">"Returns `true` if `value` is a variant of `{}`."</span>, ident); |
| <span class="kw">let </span>from_i32_doc = <span class="macro">format!</span>( |
| <span class="string">"Converts an `i32` to a `{}`, or `None` if `value` is not a valid variant."</span>, |
| ident |
| ); |
| |
| <span class="kw">let </span>expanded = <span class="macro">quote! </span>{ |
| <span class="kw">impl </span>#impl_generics #ident #ty_generics #where_clause { |
| <span class="attribute">#[doc=#is_valid_doc] |
| </span><span class="kw">pub fn </span>is_valid(value: i32) -> bool { |
| <span class="kw">match </span>value { |
| #(#is_valid,)* |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="attribute">#[doc=#from_i32_doc] |
| </span><span class="kw">pub fn </span>from_i32(value: i32) -> ::core::option::Option<#ident> { |
| <span class="kw">match </span>value { |
| #(#from,)* |
| <span class="kw">_ </span>=> ::core::option::Option::None, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>#impl_generics ::core::default::Default <span class="kw">for </span>#ident #ty_generics #where_clause { |
| <span class="kw">fn </span>default() -> #ident { |
| #ident::#default |
| } |
| } |
| |
| <span class="kw">impl </span>#impl_generics ::core::convert::From::<#ident> <span class="kw">for </span>i32 #ty_generics #where_clause { |
| <span class="kw">fn </span>from(value: #ident) -> i32 { |
| value <span class="kw">as </span>i32 |
| } |
| } |
| }; |
| |
| <span class="prelude-val">Ok</span>(expanded.into()) |
| } |
| |
| <span class="attribute">#[proc_macro_derive(Enumeration, attributes(prost))] |
| </span><span class="kw">pub fn </span>enumeration(input: TokenStream) -> TokenStream { |
| try_enumeration(input).unwrap() |
| } |
| |
| <span class="kw">fn </span>try_oneof(input: TokenStream) -> <span class="prelude-ty">Result</span><TokenStream, Error> { |
| <span class="kw">let </span>input: DeriveInput = syn::parse(input)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>ident = input.ident; |
| |
| <span class="kw">let </span>variants = <span class="kw">match </span>input.data { |
| Data::Enum(DataEnum { variants, .. }) => variants, |
| Data::Struct(..) => <span class="macro">bail!</span>(<span class="string">"Oneof can not be derived for a struct"</span>), |
| Data::Union(..) => <span class="macro">bail!</span>(<span class="string">"Oneof can not be derived for a union"</span>), |
| }; |
| |
| <span class="kw">let </span>generics = <span class="kw-2">&</span>input.generics; |
| <span class="kw">let </span>(impl_generics, ty_generics, where_clause) = generics.split_for_impl(); |
| |
| <span class="comment">// Map the variants into 'fields'. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>fields: Vec<(Ident, Field)> = Vec::new(); |
| <span class="kw">for </span>Variant { |
| attrs, |
| ident: variant_ident, |
| fields: variant_fields, |
| .. |
| } <span class="kw">in </span>variants |
| { |
| <span class="kw">let </span>variant_fields = <span class="kw">match </span>variant_fields { |
| Fields::Unit => Punctuated::new(), |
| Fields::Named(FieldsNamed { named: fields, .. }) |
| | Fields::Unnamed(FieldsUnnamed { |
| unnamed: fields, .. |
| }) => fields, |
| }; |
| <span class="kw">if </span>variant_fields.len() != <span class="number">1 </span>{ |
| <span class="macro">bail!</span>(<span class="string">"Oneof enum variants must have a single field"</span>); |
| } |
| <span class="kw">match </span>Field::new_oneof(attrs)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(field) => fields.push((variant_ident, field)), |
| <span class="prelude-val">None </span>=> <span class="macro">bail!</span>(<span class="string">"invalid oneof variant: oneof variants may not be ignored"</span>), |
| } |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>tags = fields |
| .iter() |
| .flat_map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>variant_ident, <span class="kw-2">ref </span>field)| -> <span class="prelude-ty">Result</span><u32, Error> { |
| <span class="kw">if </span>field.tags().len() > <span class="number">1 </span>{ |
| <span class="macro">bail!</span>( |
| <span class="string">"invalid oneof variant {}::{}: oneof variants may only have a single tag"</span>, |
| ident, |
| variant_ident |
| ); |
| } |
| <span class="prelude-val">Ok</span>(field.tags()[<span class="number">0</span>]) |
| }) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| tags.sort_unstable(); |
| tags.dedup(); |
| <span class="kw">if </span>tags.len() != fields.len() { |
| <span class="macro">panic!</span>(<span class="string">"invalid oneof {}: variants have duplicate tags"</span>, ident); |
| } |
| |
| <span class="kw">let </span>encode = fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>variant_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>encode = field.encode(<span class="macro">quote!</span>(<span class="kw-2">*</span>value)); |
| <span class="macro">quote!</span>(#ident::#variant_ident(<span class="kw-2">ref </span>value) => { #encode }) |
| }); |
| |
| <span class="kw">let </span>merge = fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>variant_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>tag = field.tags()[<span class="number">0</span>]; |
| <span class="kw">let </span>merge = field.merge(<span class="macro">quote!</span>(value)); |
| <span class="macro">quote! </span>{ |
| #tag => { |
| <span class="kw">match </span>field { |
| ::core::option::Option::Some(#ident::#variant_ident(<span class="kw-2">ref mut </span>value)) => { |
| #merge |
| }, |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>owned_value = ::core::default::Default::default(); |
| <span class="kw">let </span>value = <span class="kw-2">&mut </span>owned_value; |
| #merge.map(|<span class="kw">_</span>| <span class="kw-2">*</span>field = ::core::option::Option::Some(#ident::#variant_ident(owned_value))) |
| }, |
| } |
| } |
| } |
| }); |
| |
| <span class="kw">let </span>encoded_len = fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>variant_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>encoded_len = field.encoded_len(<span class="macro">quote!</span>(<span class="kw-2">*</span>value)); |
| <span class="macro">quote!</span>(#ident::#variant_ident(<span class="kw-2">ref </span>value) => #encoded_len) |
| }); |
| |
| <span class="kw">let </span>debug = fields.iter().map(|<span class="kw-2">&</span>(<span class="kw-2">ref </span>variant_ident, <span class="kw-2">ref </span>field)| { |
| <span class="kw">let </span>wrapper = field.debug(<span class="macro">quote!</span>(<span class="kw-2">*</span>value)); |
| <span class="macro">quote!</span>(#ident::#variant_ident(<span class="kw-2">ref </span>value) => { |
| <span class="kw">let </span>wrapper = #wrapper; |
| f.debug_tuple(<span class="macro">stringify!</span>(#variant_ident)) |
| .field(<span class="kw-2">&</span>wrapper) |
| .finish() |
| }) |
| }); |
| |
| <span class="kw">let </span>expanded = <span class="macro">quote! </span>{ |
| <span class="kw">impl </span>#impl_generics #ident #ty_generics #where_clause { |
| <span class="kw">pub fn </span>encode<B>(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>B) <span class="kw">where </span>B: ::prost::bytes::BufMut { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| #(#encode,)* |
| } |
| } |
| |
| <span class="kw">pub fn </span>merge<B>( |
| field: <span class="kw-2">&mut </span>::core::option::Option<#ident #ty_generics>, |
| tag: u32, |
| wire_type: ::prost::encoding::WireType, |
| buf: <span class="kw-2">&mut </span>B, |
| ctx: ::prost::encoding::DecodeContext, |
| ) -> ::core::result::Result<(), ::prost::DecodeError> |
| <span class="kw">where </span>B: ::prost::bytes::Buf { |
| <span class="kw">match </span>tag { |
| #(#merge,)* |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(<span class="macro">concat!</span>(<span class="string">"invalid "</span>, <span class="macro">stringify!</span>(#ident), <span class="string">" tag: {}"</span>), tag), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>encoded_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| #(#encoded_len,)* |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>#impl_generics ::core::fmt::Debug <span class="kw">for </span>#ident #ty_generics #where_clause { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>::core::fmt::Formatter) -> ::core::fmt::Result { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| #(#debug,)* |
| } |
| } |
| } |
| }; |
| |
| <span class="prelude-val">Ok</span>(expanded.into()) |
| } |
| |
| <span class="attribute">#[proc_macro_derive(Oneof, attributes(prost))] |
| </span><span class="kw">pub fn </span>oneof(input: TokenStream) -> TokenStream { |
| try_oneof(input).unwrap() |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="prost_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |