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<!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/field/scalar.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>scalar.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="kw">use </span>std::convert::TryFrom;
<span class="kw">use </span>std::fmt;
<span class="kw">use </span>anyhow::{anyhow, bail, Error};
<span class="kw">use </span>proc_macro2::{Span, TokenStream};
<span class="kw">use </span>quote::{quote, ToTokens, TokenStreamExt};
<span class="kw">use </span>syn::{parse_str, Ident, Lit, LitByteStr, Meta, MetaList, MetaNameValue, NestedMeta, Path};
<span class="kw">use </span><span class="kw">crate</span>::field::{bool_attr, set_option, tag_attr, Label};
<span class="doccomment">/// A scalar protobuf field.
</span><span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>Field {
<span class="kw">pub </span>ty: Ty,
<span class="kw">pub </span>kind: Kind,
<span class="kw">pub </span>tag: u32,
}
<span class="kw">impl </span>Field {
<span class="kw">pub fn </span>new(attrs: <span class="kw-2">&amp;</span>[Meta], inferred_tag: <span class="prelude-ty">Option</span>&lt;u32&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;Field&gt;, Error&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>ty = <span class="prelude-val">None</span>;
<span class="kw">let </span><span class="kw-2">mut </span>label = <span class="prelude-val">None</span>;
<span class="kw">let </span><span class="kw-2">mut </span>packed = <span class="prelude-val">None</span>;
<span class="kw">let </span><span class="kw-2">mut </span>default = <span class="prelude-val">None</span>;
<span class="kw">let </span><span class="kw-2">mut </span>tag = <span class="prelude-val">None</span>;
<span class="kw">let </span><span class="kw-2">mut </span>unknown_attrs = Vec::new();
<span class="kw">for </span>attr <span class="kw">in </span>attrs {
<span class="kw">if let </span><span class="prelude-val">Some</span>(t) = Ty::from_attr(attr)<span class="question-mark">? </span>{
set_option(<span class="kw-2">&amp;mut </span>ty, t, <span class="string">&quot;duplicate type attributes&quot;</span>)<span class="question-mark">?</span>;
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(p) = bool_attr(<span class="string">&quot;packed&quot;</span>, attr)<span class="question-mark">? </span>{
set_option(<span class="kw-2">&amp;mut </span>packed, p, <span class="string">&quot;duplicate packed attributes&quot;</span>)<span class="question-mark">?</span>;
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(t) = tag_attr(attr)<span class="question-mark">? </span>{
set_option(<span class="kw-2">&amp;mut </span>tag, t, <span class="string">&quot;duplicate tag attributes&quot;</span>)<span class="question-mark">?</span>;
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(l) = Label::from_attr(attr) {
set_option(<span class="kw-2">&amp;mut </span>label, l, <span class="string">&quot;duplicate label attributes&quot;</span>)<span class="question-mark">?</span>;
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(d) = DefaultValue::from_attr(attr)<span class="question-mark">? </span>{
set_option(<span class="kw-2">&amp;mut </span>default, d, <span class="string">&quot;duplicate default attributes&quot;</span>)<span class="question-mark">?</span>;
} <span class="kw">else </span>{
unknown_attrs.push(attr);
}
}
<span class="kw">let </span>ty = <span class="kw">match </span>ty {
<span class="prelude-val">Some</span>(ty) =&gt; ty,
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
};
<span class="kw">match </span>unknown_attrs.len() {
<span class="number">0 </span>=&gt; (),
<span class="number">1 </span>=&gt; <span class="macro">bail!</span>(<span class="string">&quot;unknown attribute: {:?}&quot;</span>, unknown_attrs[<span class="number">0</span>]),
<span class="kw">_ </span>=&gt; <span class="macro">bail!</span>(<span class="string">&quot;unknown attributes: {:?}&quot;</span>, unknown_attrs),
}
<span class="kw">let </span>tag = <span class="kw">match </span>tag.or(inferred_tag) {
<span class="prelude-val">Some</span>(tag) =&gt; tag,
<span class="prelude-val">None </span>=&gt; <span class="macro">bail!</span>(<span class="string">&quot;missing tag attribute&quot;</span>),
};
<span class="kw">let </span>has_default = default.is_some();
<span class="kw">let </span>default = default.map_or_else(
|| <span class="prelude-val">Ok</span>(DefaultValue::new(<span class="kw-2">&amp;</span>ty)),
|lit| DefaultValue::from_lit(<span class="kw-2">&amp;</span>ty, lit),
)<span class="question-mark">?</span>;
<span class="kw">let </span>kind = <span class="kw">match </span>(label, packed, has_default) {
(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="bool-val">true</span>), <span class="kw">_</span>)
| (<span class="prelude-val">Some</span>(Label::Optional), <span class="prelude-val">Some</span>(<span class="bool-val">true</span>), <span class="kw">_</span>)
| (<span class="prelude-val">Some</span>(Label::Required), <span class="prelude-val">Some</span>(<span class="bool-val">true</span>), <span class="kw">_</span>) =&gt; {
<span class="macro">bail!</span>(<span class="string">&quot;packed attribute may only be applied to repeated fields&quot;</span>);
}
(<span class="prelude-val">Some</span>(Label::Repeated), <span class="prelude-val">Some</span>(<span class="bool-val">true</span>), <span class="kw">_</span>) <span class="kw">if </span>!ty.is_numeric() =&gt; {
<span class="macro">bail!</span>(<span class="string">&quot;packed attribute may only be applied to numeric types&quot;</span>);
}
(<span class="prelude-val">Some</span>(Label::Repeated), <span class="kw">_</span>, <span class="bool-val">true</span>) =&gt; {
<span class="macro">bail!</span>(<span class="string">&quot;repeated fields may not have a default value&quot;</span>);
}
(<span class="prelude-val">None</span>, <span class="kw">_</span>, <span class="kw">_</span>) =&gt; Kind::Plain(default),
(<span class="prelude-val">Some</span>(Label::Optional), <span class="kw">_</span>, <span class="kw">_</span>) =&gt; Kind::Optional(default),
(<span class="prelude-val">Some</span>(Label::Required), <span class="kw">_</span>, <span class="kw">_</span>) =&gt; Kind::Required(default),
(<span class="prelude-val">Some</span>(Label::Repeated), packed, <span class="bool-val">false</span>) <span class="kw">if </span>packed.unwrap_or_else(|| ty.is_numeric()) =&gt; {
Kind::Packed
}
(<span class="prelude-val">Some</span>(Label::Repeated), <span class="kw">_</span>, <span class="bool-val">false</span>) =&gt; Kind::Repeated,
};
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Field { ty, kind, tag }))
}
<span class="kw">pub fn </span>new_oneof(attrs: <span class="kw-2">&amp;</span>[Meta]) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;Field&gt;, Error&gt; {
<span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>field) = Field::new(attrs, <span class="prelude-val">None</span>)<span class="question-mark">? </span>{
<span class="kw">match </span>field.kind {
Kind::Plain(default) =&gt; {
field.kind = Kind::Required(default);
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(field))
}
Kind::Optional(..) =&gt; <span class="macro">bail!</span>(<span class="string">&quot;invalid optional attribute on oneof field&quot;</span>),
Kind::Required(..) =&gt; <span class="macro">bail!</span>(<span class="string">&quot;invalid required attribute on oneof field&quot;</span>),
Kind::Packed | Kind::Repeated =&gt; <span class="macro">bail!</span>(<span class="string">&quot;invalid repeated attribute on oneof field&quot;</span>),
}
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
}
}
<span class="kw">pub fn </span>encode(<span class="kw-2">&amp;</span><span class="self">self</span>, ident: TokenStream) -&gt; TokenStream {
<span class="kw">let </span>module = <span class="self">self</span>.ty.module();
<span class="kw">let </span>encode_fn = <span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(..) | Kind::Optional(..) | Kind::Required(..) =&gt; <span class="macro">quote!</span>(encode),
Kind::Repeated =&gt; <span class="macro">quote!</span>(encode_repeated),
Kind::Packed =&gt; <span class="macro">quote!</span>(encode_packed),
};
<span class="kw">let </span>encode_fn = <span class="macro">quote!</span>(::prost::encoding::#module::#encode_fn);
<span class="kw">let </span>tag = <span class="self">self</span>.tag;
<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(<span class="kw-2">ref </span>default) =&gt; {
<span class="kw">let </span>default = default.typed();
<span class="macro">quote! </span>{
<span class="kw">if </span>#ident != #default {
#encode_fn(#tag, <span class="kw-2">&amp;</span>#ident, buf);
}
}
}
Kind::Optional(..) =&gt; <span class="macro">quote! </span>{
<span class="kw">if let </span>::core::option::Option::Some(<span class="kw-2">ref </span>value) = #ident {
#encode_fn(#tag, value, buf);
}
},
Kind::Required(..) | Kind::Repeated | Kind::Packed =&gt; <span class="macro">quote! </span>{
#encode_fn(#tag, <span class="kw-2">&amp;</span>#ident, buf);
},
}
}
<span class="doccomment">/// Returns an expression which evaluates to the result of merging a decoded
/// scalar value into the field.
</span><span class="kw">pub fn </span>merge(<span class="kw-2">&amp;</span><span class="self">self</span>, ident: TokenStream) -&gt; TokenStream {
<span class="kw">let </span>module = <span class="self">self</span>.ty.module();
<span class="kw">let </span>merge_fn = <span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(..) | Kind::Optional(..) | Kind::Required(..) =&gt; <span class="macro">quote!</span>(merge),
Kind::Repeated | Kind::Packed =&gt; <span class="macro">quote!</span>(merge_repeated),
};
<span class="kw">let </span>merge_fn = <span class="macro">quote!</span>(::prost::encoding::#module::#merge_fn);
<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(..) | Kind::Required(..) | Kind::Repeated | Kind::Packed =&gt; <span class="macro">quote! </span>{
#merge_fn(wire_type, #ident, buf, ctx)
},
Kind::Optional(..) =&gt; <span class="macro">quote! </span>{
#merge_fn(wire_type,
#ident.get_or_insert_with(::core::default::Default::default),
buf,
ctx)
},
}
}
<span class="doccomment">/// Returns an expression which evaluates to the encoded length of the field.
</span><span class="kw">pub fn </span>encoded_len(<span class="kw-2">&amp;</span><span class="self">self</span>, ident: TokenStream) -&gt; TokenStream {
<span class="kw">let </span>module = <span class="self">self</span>.ty.module();
<span class="kw">let </span>encoded_len_fn = <span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(..) | Kind::Optional(..) | Kind::Required(..) =&gt; <span class="macro">quote!</span>(encoded_len),
Kind::Repeated =&gt; <span class="macro">quote!</span>(encoded_len_repeated),
Kind::Packed =&gt; <span class="macro">quote!</span>(encoded_len_packed),
};
<span class="kw">let </span>encoded_len_fn = <span class="macro">quote!</span>(::prost::encoding::#module::#encoded_len_fn);
<span class="kw">let </span>tag = <span class="self">self</span>.tag;
<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(<span class="kw-2">ref </span>default) =&gt; {
<span class="kw">let </span>default = default.typed();
<span class="macro">quote! </span>{
<span class="kw">if </span>#ident != #default {
#encoded_len_fn(#tag, <span class="kw-2">&amp;</span>#ident)
} <span class="kw">else </span>{
<span class="number">0
</span>}
}
}
Kind::Optional(..) =&gt; <span class="macro">quote! </span>{
#ident.as_ref().map_or(<span class="number">0</span>, |value| #encoded_len_fn(#tag, value))
},
Kind::Required(..) | Kind::Repeated | Kind::Packed =&gt; <span class="macro">quote! </span>{
#encoded_len_fn(#tag, <span class="kw-2">&amp;</span>#ident)
},
}
}
<span class="kw">pub fn </span>clear(<span class="kw-2">&amp;</span><span class="self">self</span>, ident: TokenStream) -&gt; TokenStream {
<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(<span class="kw-2">ref </span>default) | Kind::Required(<span class="kw-2">ref </span>default) =&gt; {
<span class="kw">let </span>default = default.typed();
<span class="kw">match </span><span class="self">self</span>.ty {
Ty::String | Ty::Bytes(..) =&gt; <span class="macro">quote!</span>(#ident.clear()),
<span class="kw">_ </span>=&gt; <span class="macro">quote!</span>(#ident = #default),
}
}
Kind::Optional(<span class="kw">_</span>) =&gt; <span class="macro">quote!</span>(#ident = ::core::option::Option::None),
Kind::Repeated | Kind::Packed =&gt; <span class="macro">quote!</span>(#ident.clear()),
}
}
<span class="doccomment">/// Returns an expression which evaluates to the default value of the field.
</span><span class="kw">pub fn </span>default(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(<span class="kw-2">ref </span>value) | Kind::Required(<span class="kw-2">ref </span>value) =&gt; value.owned(),
Kind::Optional(<span class="kw">_</span>) =&gt; <span class="macro">quote!</span>(::core::option::Option::None),
Kind::Repeated | Kind::Packed =&gt; <span class="macro">quote!</span>(::prost::alloc::vec::Vec::new()),
}
}
<span class="doccomment">/// An inner debug wrapper, around the base type.
</span><span class="kw">fn </span>debug_inner(<span class="kw-2">&amp;</span><span class="self">self</span>, wrap_name: TokenStream) -&gt; TokenStream {
<span class="kw">if let </span>Ty::Enumeration(<span class="kw-2">ref </span>ty) = <span class="self">self</span>.ty {
<span class="macro">quote! </span>{
<span class="kw">struct </span>#wrap_name&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>i32);
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ::core::fmt::Debug <span class="kw">for </span>#wrap_name&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>::core::fmt::Formatter) -&gt; ::core::fmt::Result {
<span class="kw">match </span>#ty::from_i32(<span class="kw-2">*</span><span class="self">self</span>.<span class="number">0</span>) {
<span class="prelude-val">None </span>=&gt; ::core::fmt::Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>, f),
<span class="prelude-val">Some</span>(en) =&gt; ::core::fmt::Debug::fmt(<span class="kw-2">&amp;</span>en, f),
}
}
}
}
} <span class="kw">else </span>{
<span class="macro">quote! </span>{
<span class="kw">fn </span>#wrap_name&lt;T&gt;(v: T) -&gt; T { v }
}
}
}
<span class="doccomment">/// Returns a fragment for formatting the field `ident` in `Debug`.
</span><span class="kw">pub fn </span>debug(<span class="kw-2">&amp;</span><span class="self">self</span>, wrapper_name: TokenStream) -&gt; TokenStream {
<span class="kw">let </span>wrapper = <span class="self">self</span>.debug_inner(<span class="macro">quote!</span>(Inner));
<span class="kw">let </span>inner_ty = <span class="self">self</span>.ty.rust_type();
<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(<span class="kw">_</span>) | Kind::Required(<span class="kw">_</span>) =&gt; <span class="self">self</span>.debug_inner(wrapper_name),
Kind::Optional(<span class="kw">_</span>) =&gt; <span class="macro">quote! </span>{
<span class="kw">struct </span>#wrapper_name&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>::core::option::Option&lt;#inner_ty&gt;);
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ::core::fmt::Debug <span class="kw">for </span>#wrapper_name&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>::core::fmt::Formatter) -&gt; ::core::fmt::Result {
#wrapper
::core::fmt::Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>.as_ref().map(Inner), f)
}
}
},
Kind::Repeated | Kind::Packed =&gt; {
<span class="macro">quote! </span>{
<span class="kw">struct </span>#wrapper_name&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>::prost::alloc::vec::Vec&lt;#inner_ty&gt;);
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ::core::fmt::Debug <span class="kw">for </span>#wrapper_name&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>::core::fmt::Formatter) -&gt; ::core::fmt::Result {
<span class="kw">let </span><span class="kw-2">mut </span>vec_builder = f.debug_list();
<span class="kw">for </span>v <span class="kw">in </span><span class="self">self</span>.<span class="number">0 </span>{
#wrapper
vec_builder.entry(<span class="kw-2">&amp;</span>Inner(v));
}
vec_builder.finish()
}
}
}
}
}
}
<span class="doccomment">/// Returns methods to embed in the message.
</span><span class="kw">pub fn </span>methods(<span class="kw-2">&amp;</span><span class="self">self</span>, ident: <span class="kw-2">&amp;</span>Ident) -&gt; <span class="prelude-ty">Option</span>&lt;TokenStream&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>ident_str = ident.to_string();
<span class="kw">if </span>ident_str.starts_with(<span class="string">&quot;r#&quot;</span>) {
ident_str = ident_str[<span class="number">2</span>..].to_owned();
}
<span class="kw">if let </span>Ty::Enumeration(<span class="kw-2">ref </span>ty) = <span class="self">self</span>.ty {
<span class="kw">let </span>set = Ident::new(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;set_{}&quot;</span>, ident_str), Span::call_site());
<span class="kw">let </span>set_doc = <span class="macro">format!</span>(<span class="string">&quot;Sets `{}` to the provided enum value.&quot;</span>, ident_str);
<span class="prelude-val">Some</span>(<span class="kw">match </span><span class="self">self</span>.kind {
Kind::Plain(<span class="kw-2">ref </span>default) | Kind::Required(<span class="kw-2">ref </span>default) =&gt; {
<span class="kw">let </span>get_doc = <span class="macro">format!</span>(
<span class="string">&quot;Returns the enum value of `{}`, \
or the default if the field is set to an invalid enum value.&quot;</span>,
ident_str,
);
<span class="macro">quote! </span>{
<span class="attribute">#[doc=#get_doc]
</span><span class="kw">pub fn </span>#ident(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; #ty {
#ty::from_i32(<span class="self">self</span>.#ident).unwrap_or(#default)
}
<span class="attribute">#[doc=#set_doc]
</span><span class="kw">pub fn </span>#set(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: #ty) {
<span class="self">self</span>.#ident = value <span class="kw">as </span>i32;
}
}
}
Kind::Optional(<span class="kw-2">ref </span>default) =&gt; {
<span class="kw">let </span>get_doc = <span class="macro">format!</span>(
<span class="string">&quot;Returns the enum value of `{}`, \
or the default if the field is unset or set to an invalid enum value.&quot;</span>,
ident_str,
);
<span class="macro">quote! </span>{
<span class="attribute">#[doc=#get_doc]
</span><span class="kw">pub fn </span>#ident(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; #ty {
<span class="self">self</span>.#ident.and_then(#ty::from_i32).unwrap_or(#default)
}
<span class="attribute">#[doc=#set_doc]
</span><span class="kw">pub fn </span>#set(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: #ty) {
<span class="self">self</span>.#ident = ::core::option::Option::Some(value <span class="kw">as </span>i32);
}
}
}
Kind::Repeated | Kind::Packed =&gt; {
<span class="kw">let </span>iter_doc = <span class="macro">format!</span>(
<span class="string">&quot;Returns an iterator which yields the valid enum values contained in `{}`.&quot;</span>,
ident_str,
);
<span class="kw">let </span>push = Ident::new(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;push_{}&quot;</span>, ident_str), Span::call_site());
<span class="kw">let </span>push_doc = <span class="macro">format!</span>(<span class="string">&quot;Appends the provided enum value to `{}`.&quot;</span>, ident_str);
<span class="macro">quote! </span>{
<span class="attribute">#[doc=#iter_doc]
</span><span class="kw">pub fn </span>#ident(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; ::core::iter::FilterMap&lt;
::core::iter::Cloned&lt;::core::slice::Iter&lt;i32&gt;&gt;,
<span class="kw">fn</span>(i32) -&gt; ::core::option::Option&lt;#ty&gt;,
&gt; {
<span class="self">self</span>.#ident.iter().cloned().filter_map(#ty::from_i32)
}
<span class="attribute">#[doc=#push_doc]
</span><span class="kw">pub fn </span>#push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: #ty) {
<span class="self">self</span>.#ident.push(value <span class="kw">as </span>i32);
}
}
}
})
} <span class="kw">else if let </span>Kind::Optional(<span class="kw-2">ref </span>default) = <span class="self">self</span>.kind {
<span class="kw">let </span>ty = <span class="self">self</span>.ty.rust_ref_type();
<span class="kw">let </span>match_some = <span class="kw">if </span><span class="self">self</span>.ty.is_numeric() {
<span class="macro">quote!</span>(::core::option::Option::Some(val) =&gt; val,)
} <span class="kw">else </span>{
<span class="macro">quote!</span>(::core::option::Option::Some(<span class="kw-2">ref </span>val) =&gt; <span class="kw-2">&amp;</span>val[..],)
};
<span class="kw">let </span>get_doc = <span class="macro">format!</span>(
<span class="string">&quot;Returns the value of `{0}`, or the default value if `{0}` is unset.&quot;</span>,
ident_str,
);
<span class="prelude-val">Some</span>(<span class="macro">quote! </span>{
<span class="attribute">#[doc=#get_doc]
</span><span class="kw">pub fn </span>#ident(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; #ty {
<span class="kw">match </span><span class="self">self</span>.#ident {
#match_some
::core::option::Option::None =&gt; #default,
}
}
})
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
}
<span class="doccomment">/// A scalar protobuf field type.
</span><span class="attribute">#[derive(Clone, PartialEq, Eq)]
</span><span class="kw">pub enum </span>Ty {
Double,
Float,
Int32,
Int64,
Uint32,
Uint64,
Sint32,
Sint64,
Fixed32,
Fixed64,
Sfixed32,
Sfixed64,
Bool,
String,
Bytes(BytesTy),
Enumeration(Path),
}
<span class="attribute">#[derive(Clone, Debug, PartialEq, Eq)]
</span><span class="kw">pub enum </span>BytesTy {
Vec,
Bytes,
}
<span class="kw">impl </span>BytesTy {
<span class="kw">fn </span>try_from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, Error&gt; {
<span class="kw">match </span>s {
<span class="string">&quot;vec&quot; </span>=&gt; <span class="prelude-val">Ok</span>(BytesTy::Vec),
<span class="string">&quot;bytes&quot; </span>=&gt; <span class="prelude-val">Ok</span>(BytesTy::Bytes),
<span class="kw">_ </span>=&gt; <span class="macro">bail!</span>(<span class="string">&quot;Invalid bytes type: {}&quot;</span>, s),
}
}
<span class="kw">fn </span>rust_type(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">match </span><span class="self">self </span>{
BytesTy::Vec =&gt; <span class="macro">quote! </span>{ ::prost::alloc::vec::Vec&lt;u8&gt; },
BytesTy::Bytes =&gt; <span class="macro">quote! </span>{ ::prost::bytes::Bytes },
}
}
}
<span class="kw">impl </span>Ty {
<span class="kw">pub fn </span>from_attr(attr: <span class="kw-2">&amp;</span>Meta) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;Ty&gt;, Error&gt; {
<span class="kw">let </span>ty = <span class="kw">match </span><span class="kw-2">*</span>attr {
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;float&quot;</span>) =&gt; Ty::Float,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;double&quot;</span>) =&gt; Ty::Double,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;int32&quot;</span>) =&gt; Ty::Int32,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;int64&quot;</span>) =&gt; Ty::Int64,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;uint32&quot;</span>) =&gt; Ty::Uint32,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;uint64&quot;</span>) =&gt; Ty::Uint64,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;sint32&quot;</span>) =&gt; Ty::Sint32,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;sint64&quot;</span>) =&gt; Ty::Sint64,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;fixed32&quot;</span>) =&gt; Ty::Fixed32,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;fixed64&quot;</span>) =&gt; Ty::Fixed64,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;sfixed32&quot;</span>) =&gt; Ty::Sfixed32,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;sfixed64&quot;</span>) =&gt; Ty::Sfixed64,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;bool&quot;</span>) =&gt; Ty::Bool,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;string&quot;</span>) =&gt; Ty::String,
Meta::Path(<span class="kw-2">ref </span>name) <span class="kw">if </span>name.is_ident(<span class="string">&quot;bytes&quot;</span>) =&gt; Ty::Bytes(BytesTy::Vec),
Meta::NameValue(MetaNameValue {
<span class="kw-2">ref </span>path,
lit: Lit::Str(<span class="kw-2">ref </span>l),
..
}) <span class="kw">if </span>path.is_ident(<span class="string">&quot;bytes&quot;</span>) =&gt; Ty::Bytes(BytesTy::try_from_str(<span class="kw-2">&amp;</span>l.value())<span class="question-mark">?</span>),
Meta::NameValue(MetaNameValue {
<span class="kw-2">ref </span>path,
lit: Lit::Str(<span class="kw-2">ref </span>l),
..
}) <span class="kw">if </span>path.is_ident(<span class="string">&quot;enumeration&quot;</span>) =&gt; Ty::Enumeration(parse_str::&lt;Path&gt;(<span class="kw-2">&amp;</span>l.value())<span class="question-mark">?</span>),
Meta::List(MetaList {
<span class="kw-2">ref </span>path,
<span class="kw-2">ref </span>nested,
..
}) <span class="kw">if </span>path.is_ident(<span class="string">&quot;enumeration&quot;</span>) =&gt; {
<span class="comment">// TODO(rustlang/rust#23121): slice pattern matching would make this much nicer.
</span><span class="kw">if </span>nested.len() == <span class="number">1 </span>{
<span class="kw">if let </span>NestedMeta::Meta(Meta::Path(<span class="kw-2">ref </span>path)) = nested[<span class="number">0</span>] {
Ty::Enumeration(path.clone())
} <span class="kw">else </span>{
<span class="macro">bail!</span>(<span class="string">&quot;invalid enumeration attribute: item must be an identifier&quot;</span>);
}
} <span class="kw">else </span>{
<span class="macro">bail!</span>(<span class="string">&quot;invalid enumeration attribute: only a single identifier is supported&quot;</span>);
}
}
<span class="kw">_ </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
};
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(ty))
}
<span class="kw">pub fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;Ty, Error&gt; {
<span class="kw">let </span>enumeration_len = <span class="string">&quot;enumeration&quot;</span>.len();
<span class="kw">let </span>error = <span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(<span class="string">&quot;invalid type: {}&quot;</span>, s));
<span class="kw">let </span>ty = <span class="kw">match </span>s.trim() {
<span class="string">&quot;float&quot; </span>=&gt; Ty::Float,
<span class="string">&quot;double&quot; </span>=&gt; Ty::Double,
<span class="string">&quot;int32&quot; </span>=&gt; Ty::Int32,
<span class="string">&quot;int64&quot; </span>=&gt; Ty::Int64,
<span class="string">&quot;uint32&quot; </span>=&gt; Ty::Uint32,
<span class="string">&quot;uint64&quot; </span>=&gt; Ty::Uint64,
<span class="string">&quot;sint32&quot; </span>=&gt; Ty::Sint32,
<span class="string">&quot;sint64&quot; </span>=&gt; Ty::Sint64,
<span class="string">&quot;fixed32&quot; </span>=&gt; Ty::Fixed32,
<span class="string">&quot;fixed64&quot; </span>=&gt; Ty::Fixed64,
<span class="string">&quot;sfixed32&quot; </span>=&gt; Ty::Sfixed32,
<span class="string">&quot;sfixed64&quot; </span>=&gt; Ty::Sfixed64,
<span class="string">&quot;bool&quot; </span>=&gt; Ty::Bool,
<span class="string">&quot;string&quot; </span>=&gt; Ty::String,
<span class="string">&quot;bytes&quot; </span>=&gt; Ty::Bytes(BytesTy::Vec),
s <span class="kw">if </span>s.len() &gt; enumeration_len &amp;&amp; <span class="kw-2">&amp;</span>s[..enumeration_len] == <span class="string">&quot;enumeration&quot; </span>=&gt; {
<span class="kw">let </span>s = <span class="kw-2">&amp;</span>s[enumeration_len..].trim();
<span class="kw">match </span>s.chars().next() {
<span class="prelude-val">Some</span>(<span class="string">&#39;&lt;&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">&#39;(&#39;</span>) =&gt; (),
<span class="kw">_ </span>=&gt; <span class="kw">return </span>error,
}
<span class="kw">match </span>s.chars().next_back() {
<span class="prelude-val">Some</span>(<span class="string">&#39;&gt;&#39;</span>) | <span class="prelude-val">Some</span>(<span class="string">&#39;)&#39;</span>) =&gt; (),
<span class="kw">_ </span>=&gt; <span class="kw">return </span>error,
}
Ty::Enumeration(parse_str::&lt;Path&gt;(s[<span class="number">1</span>..s.len() - <span class="number">1</span>].trim())<span class="question-mark">?</span>)
}
<span class="kw">_ </span>=&gt; <span class="kw">return </span>error,
};
<span class="prelude-val">Ok</span>(ty)
}
<span class="doccomment">/// Returns the type as it appears in protobuf field declarations.
</span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
Ty::Double =&gt; <span class="string">&quot;double&quot;</span>,
Ty::Float =&gt; <span class="string">&quot;float&quot;</span>,
Ty::Int32 =&gt; <span class="string">&quot;int32&quot;</span>,
Ty::Int64 =&gt; <span class="string">&quot;int64&quot;</span>,
Ty::Uint32 =&gt; <span class="string">&quot;uint32&quot;</span>,
Ty::Uint64 =&gt; <span class="string">&quot;uint64&quot;</span>,
Ty::Sint32 =&gt; <span class="string">&quot;sint32&quot;</span>,
Ty::Sint64 =&gt; <span class="string">&quot;sint64&quot;</span>,
Ty::Fixed32 =&gt; <span class="string">&quot;fixed32&quot;</span>,
Ty::Fixed64 =&gt; <span class="string">&quot;fixed64&quot;</span>,
Ty::Sfixed32 =&gt; <span class="string">&quot;sfixed32&quot;</span>,
Ty::Sfixed64 =&gt; <span class="string">&quot;sfixed64&quot;</span>,
Ty::Bool =&gt; <span class="string">&quot;bool&quot;</span>,
Ty::String =&gt; <span class="string">&quot;string&quot;</span>,
Ty::Bytes(..) =&gt; <span class="string">&quot;bytes&quot;</span>,
Ty::Enumeration(..) =&gt; <span class="string">&quot;enum&quot;</span>,
}
}
<span class="comment">// TODO: rename to &#39;owned_type&#39;.
</span><span class="kw">pub fn </span>rust_type(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">match </span><span class="self">self </span>{
Ty::String =&gt; <span class="macro">quote!</span>(::prost::alloc::string::String),
Ty::Bytes(ty) =&gt; ty.rust_type(),
<span class="kw">_ </span>=&gt; <span class="self">self</span>.rust_ref_type(),
}
}
<span class="comment">// TODO: rename to &#39;ref_type&#39;
</span><span class="kw">pub fn </span>rust_ref_type(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
Ty::Double =&gt; <span class="macro">quote!</span>(f64),
Ty::Float =&gt; <span class="macro">quote!</span>(f32),
Ty::Int32 =&gt; <span class="macro">quote!</span>(i32),
Ty::Int64 =&gt; <span class="macro">quote!</span>(i64),
Ty::Uint32 =&gt; <span class="macro">quote!</span>(u32),
Ty::Uint64 =&gt; <span class="macro">quote!</span>(u64),
Ty::Sint32 =&gt; <span class="macro">quote!</span>(i32),
Ty::Sint64 =&gt; <span class="macro">quote!</span>(i64),
Ty::Fixed32 =&gt; <span class="macro">quote!</span>(u32),
Ty::Fixed64 =&gt; <span class="macro">quote!</span>(u64),
Ty::Sfixed32 =&gt; <span class="macro">quote!</span>(i32),
Ty::Sfixed64 =&gt; <span class="macro">quote!</span>(i64),
Ty::Bool =&gt; <span class="macro">quote!</span>(bool),
Ty::String =&gt; <span class="macro">quote!</span>(<span class="kw-2">&amp;</span>str),
Ty::Bytes(..) =&gt; <span class="macro">quote!</span>(<span class="kw-2">&amp;</span>[u8]),
Ty::Enumeration(..) =&gt; <span class="macro">quote!</span>(i32),
}
}
<span class="kw">pub fn </span>module(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Ident {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
Ty::Enumeration(..) =&gt; Ident::new(<span class="string">&quot;int32&quot;</span>, Span::call_site()),
<span class="kw">_ </span>=&gt; Ident::new(<span class="self">self</span>.as_str(), Span::call_site()),
}
}
<span class="doccomment">/// Returns false if the scalar type is length delimited (i.e., `string` or `bytes`).
</span><span class="kw">pub fn </span>is_numeric(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
!<span class="macro">matches!</span>(<span class="self">self</span>, Ty::String | Ty::Bytes(..))
}
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Ty {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
f.write_str(<span class="self">self</span>.as_str())
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>Ty {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
f.write_str(<span class="self">self</span>.as_str())
}
}
<span class="doccomment">/// Scalar Protobuf field types.
</span><span class="attribute">#[derive(Clone)]
</span><span class="kw">pub enum </span>Kind {
<span class="doccomment">/// A plain proto3 scalar field.
</span>Plain(DefaultValue),
<span class="doccomment">/// An optional scalar field.
</span>Optional(DefaultValue),
<span class="doccomment">/// A required proto2 scalar field.
</span>Required(DefaultValue),
<span class="doccomment">/// A repeated scalar field.
</span>Repeated,
<span class="doccomment">/// A packed repeated scalar field.
</span>Packed,
}
<span class="doccomment">/// Scalar Protobuf field default value.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">pub enum </span>DefaultValue {
F64(f64),
F32(f32),
I32(i32),
I64(i64),
U32(u32),
U64(u64),
Bool(bool),
String(String),
Bytes(Vec&lt;u8&gt;),
Enumeration(TokenStream),
Path(Path),
}
<span class="kw">impl </span>DefaultValue {
<span class="kw">pub fn </span>from_attr(attr: <span class="kw-2">&amp;</span>Meta) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;Lit&gt;, Error&gt; {
<span class="kw">if </span>!attr.path().is_ident(<span class="string">&quot;default&quot;</span>) {
<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
} <span class="kw">else if let </span>Meta::NameValue(<span class="kw-2">ref </span>name_value) = <span class="kw-2">*</span>attr {
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(name_value.lit.clone()))
} <span class="kw">else </span>{
<span class="macro">bail!</span>(<span class="string">&quot;invalid default value attribute: {:?}&quot;</span>, attr)
}
}
<span class="kw">pub fn </span>from_lit(ty: <span class="kw-2">&amp;</span>Ty, lit: Lit) -&gt; <span class="prelude-ty">Result</span>&lt;DefaultValue, Error&gt; {
<span class="kw">let </span>is_i32 = <span class="kw-2">*</span>ty == Ty::Int32 || <span class="kw-2">*</span>ty == Ty::Sint32 || <span class="kw-2">*</span>ty == Ty::Sfixed32;
<span class="kw">let </span>is_i64 = <span class="kw-2">*</span>ty == Ty::Int64 || <span class="kw-2">*</span>ty == Ty::Sint64 || <span class="kw-2">*</span>ty == Ty::Sfixed64;
<span class="kw">let </span>is_u32 = <span class="kw-2">*</span>ty == Ty::Uint32 || <span class="kw-2">*</span>ty == Ty::Fixed32;
<span class="kw">let </span>is_u64 = <span class="kw-2">*</span>ty == Ty::Uint64 || <span class="kw-2">*</span>ty == Ty::Fixed64;
<span class="kw">let </span>empty_or_is = |expected, actual: <span class="kw-2">&amp;</span>str| expected == actual || actual.is_empty();
<span class="kw">let </span>default = <span class="kw">match </span>lit {
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span>is_i32 &amp;&amp; empty_or_is(<span class="string">&quot;i32&quot;</span>, lit.suffix()) =&gt; {
DefaultValue::I32(lit.base10_parse()<span class="question-mark">?</span>)
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span>is_i64 &amp;&amp; empty_or_is(<span class="string">&quot;i64&quot;</span>, lit.suffix()) =&gt; {
DefaultValue::I64(lit.base10_parse()<span class="question-mark">?</span>)
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span>is_u32 &amp;&amp; empty_or_is(<span class="string">&quot;u32&quot;</span>, lit.suffix()) =&gt; {
DefaultValue::U32(lit.base10_parse()<span class="question-mark">?</span>)
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span>is_u64 &amp;&amp; empty_or_is(<span class="string">&quot;u64&quot;</span>, lit.suffix()) =&gt; {
DefaultValue::U64(lit.base10_parse()<span class="question-mark">?</span>)
}
Lit::Float(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Float &amp;&amp; empty_or_is(<span class="string">&quot;f32&quot;</span>, lit.suffix()) =&gt; {
DefaultValue::F32(lit.base10_parse()<span class="question-mark">?</span>)
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Float =&gt; DefaultValue::F32(lit.base10_parse()<span class="question-mark">?</span>),
Lit::Float(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Double &amp;&amp; empty_or_is(<span class="string">&quot;f64&quot;</span>, lit.suffix()) =&gt; {
DefaultValue::F64(lit.base10_parse()<span class="question-mark">?</span>)
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Double =&gt; DefaultValue::F64(lit.base10_parse()<span class="question-mark">?</span>),
Lit::Bool(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Bool =&gt; DefaultValue::Bool(lit.value),
Lit::Str(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::String =&gt; DefaultValue::String(lit.value()),
Lit::ByteStr(<span class="kw-2">ref </span>lit)
<span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Bytes(BytesTy::Bytes) || <span class="kw-2">*</span>ty == Ty::Bytes(BytesTy::Vec) =&gt;
{
DefaultValue::Bytes(lit.value())
}
Lit::Str(<span class="kw-2">ref </span>lit) =&gt; {
<span class="kw">let </span>value = lit.value();
<span class="kw">let </span>value = value.trim();
<span class="kw">if let </span>Ty::Enumeration(<span class="kw-2">ref </span>path) = <span class="kw-2">*</span>ty {
<span class="kw">let </span>variant = Ident::new(value, Span::call_site());
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Enumeration(<span class="macro">quote!</span>(#path::#variant)));
}
<span class="comment">// Parse special floating point values.
</span><span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Float {
<span class="kw">match </span>value {
<span class="string">&quot;inf&quot; </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Path(parse_str::&lt;Path&gt;(
<span class="string">&quot;::core::f32::INFINITY&quot;</span>,
)<span class="question-mark">?</span>));
}
<span class="string">&quot;-inf&quot; </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Path(parse_str::&lt;Path&gt;(
<span class="string">&quot;::core::f32::NEG_INFINITY&quot;</span>,
)<span class="question-mark">?</span>));
}
<span class="string">&quot;nan&quot; </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Path(parse_str::&lt;Path&gt;(<span class="string">&quot;::core::f32::NAN&quot;</span>)<span class="question-mark">?</span>));
}
<span class="kw">_ </span>=&gt; (),
}
}
<span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Double {
<span class="kw">match </span>value {
<span class="string">&quot;inf&quot; </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Path(parse_str::&lt;Path&gt;(
<span class="string">&quot;::core::f64::INFINITY&quot;</span>,
)<span class="question-mark">?</span>));
}
<span class="string">&quot;-inf&quot; </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Path(parse_str::&lt;Path&gt;(
<span class="string">&quot;::core::f64::NEG_INFINITY&quot;</span>,
)<span class="question-mark">?</span>));
}
<span class="string">&quot;nan&quot; </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::Path(parse_str::&lt;Path&gt;(<span class="string">&quot;::core::f64::NAN&quot;</span>)<span class="question-mark">?</span>));
}
<span class="kw">_ </span>=&gt; (),
}
}
<span class="comment">// Rust doesn&#39;t have a negative literals, so they have to be parsed specially.
</span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(lit)) = value.strip_prefix(<span class="string">&#39;-&#39;</span>).map(syn::parse_str::&lt;Lit&gt;) {
<span class="kw">match </span>lit {
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span>is_i32 &amp;&amp; empty_or_is(<span class="string">&quot;i32&quot;</span>, lit.suffix()) =&gt; {
<span class="comment">// Initially parse into an i64, so that i32::MIN does not overflow.
</span><span class="kw">let </span>value: i64 = -lit.base10_parse()<span class="question-mark">?</span>;
<span class="kw">return </span><span class="prelude-val">Ok</span>(i32::try_from(value).map(DefaultValue::I32)<span class="question-mark">?</span>);
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span>is_i64 &amp;&amp; empty_or_is(<span class="string">&quot;i64&quot;</span>, lit.suffix()) =&gt; {
<span class="comment">// Initially parse into an i128, so that i64::MIN does not overflow.
</span><span class="kw">let </span>value: i128 = -lit.base10_parse()<span class="question-mark">?</span>;
<span class="kw">return </span><span class="prelude-val">Ok</span>(i64::try_from(value).map(DefaultValue::I64)<span class="question-mark">?</span>);
}
Lit::Float(<span class="kw-2">ref </span>lit)
<span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Float &amp;&amp; empty_or_is(<span class="string">&quot;f32&quot;</span>, lit.suffix()) =&gt;
{
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::F32(-lit.base10_parse()<span class="question-mark">?</span>));
}
Lit::Float(<span class="kw-2">ref </span>lit)
<span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Double &amp;&amp; empty_or_is(<span class="string">&quot;f64&quot;</span>, lit.suffix()) =&gt;
{
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::F64(-lit.base10_parse()<span class="question-mark">?</span>));
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Float &amp;&amp; lit.suffix().is_empty() =&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::F32(-lit.base10_parse()<span class="question-mark">?</span>));
}
Lit::Int(<span class="kw-2">ref </span>lit) <span class="kw">if </span><span class="kw-2">*</span>ty == Ty::Double &amp;&amp; lit.suffix().is_empty() =&gt; {
<span class="kw">return </span><span class="prelude-val">Ok</span>(DefaultValue::F64(-lit.base10_parse()<span class="question-mark">?</span>));
}
<span class="kw">_ </span>=&gt; (),
}
}
<span class="kw">match </span>syn::parse_str::&lt;Lit&gt;(<span class="kw-2">&amp;</span>value) {
<span class="prelude-val">Ok</span>(Lit::Str(<span class="kw">_</span>)) =&gt; (),
<span class="prelude-val">Ok</span>(lit) =&gt; <span class="kw">return </span>DefaultValue::from_lit(ty, lit),
<span class="kw">_ </span>=&gt; (),
}
<span class="macro">bail!</span>(<span class="string">&quot;invalid default value: {}&quot;</span>, <span class="macro">quote!</span>(#value));
}
<span class="kw">_ </span>=&gt; <span class="macro">bail!</span>(<span class="string">&quot;invalid default value: {}&quot;</span>, <span class="macro">quote!</span>(#lit)),
};
<span class="prelude-val">Ok</span>(default)
}
<span class="kw">pub fn </span>new(ty: <span class="kw-2">&amp;</span>Ty) -&gt; DefaultValue {
<span class="kw">match </span><span class="kw-2">*</span>ty {
Ty::Float =&gt; DefaultValue::F32(<span class="number">0.0</span>),
Ty::Double =&gt; DefaultValue::F64(<span class="number">0.0</span>),
Ty::Int32 | Ty::Sint32 | Ty::Sfixed32 =&gt; DefaultValue::I32(<span class="number">0</span>),
Ty::Int64 | Ty::Sint64 | Ty::Sfixed64 =&gt; DefaultValue::I64(<span class="number">0</span>),
Ty::Uint32 | Ty::Fixed32 =&gt; DefaultValue::U32(<span class="number">0</span>),
Ty::Uint64 | Ty::Fixed64 =&gt; DefaultValue::U64(<span class="number">0</span>),
Ty::Bool =&gt; DefaultValue::Bool(<span class="bool-val">false</span>),
Ty::String =&gt; DefaultValue::String(String::new()),
Ty::Bytes(..) =&gt; DefaultValue::Bytes(Vec::new()),
Ty::Enumeration(<span class="kw-2">ref </span>path) =&gt; DefaultValue::Enumeration(<span class="macro">quote!</span>(#path::default())),
}
}
<span class="kw">pub fn </span>owned(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
DefaultValue::String(<span class="kw-2">ref </span>value) <span class="kw">if </span>value.is_empty() =&gt; {
<span class="macro">quote!</span>(::prost::alloc::string::String::new())
}
DefaultValue::String(<span class="kw-2">ref </span>value) =&gt; <span class="macro">quote!</span>(#value.into()),
DefaultValue::Bytes(<span class="kw-2">ref </span>value) <span class="kw">if </span>value.is_empty() =&gt; {
<span class="macro">quote!</span>(::core::default::Default::default())
}
DefaultValue::Bytes(<span class="kw-2">ref </span>value) =&gt; {
<span class="kw">let </span>lit = LitByteStr::new(value, Span::call_site());
<span class="macro">quote!</span>(#lit.as_ref().into())
}
<span class="kw-2">ref </span>other =&gt; other.typed(),
}
}
<span class="kw">pub fn </span>typed(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">if let </span>DefaultValue::Enumeration(<span class="kw">_</span>) = <span class="kw-2">*</span><span class="self">self </span>{
<span class="macro">quote!</span>(#<span class="self">self </span><span class="kw">as </span>i32)
} <span class="kw">else </span>{
<span class="macro">quote!</span>(#<span class="self">self</span>)
}
}
}
<span class="kw">impl </span>ToTokens <span class="kw">for </span>DefaultValue {
<span class="kw">fn </span>to_tokens(<span class="kw-2">&amp;</span><span class="self">self</span>, tokens: <span class="kw-2">&amp;mut </span>TokenStream) {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
DefaultValue::F64(value) =&gt; value.to_tokens(tokens),
DefaultValue::F32(value) =&gt; value.to_tokens(tokens),
DefaultValue::I32(value) =&gt; value.to_tokens(tokens),
DefaultValue::I64(value) =&gt; value.to_tokens(tokens),
DefaultValue::U32(value) =&gt; value.to_tokens(tokens),
DefaultValue::U64(value) =&gt; value.to_tokens(tokens),
DefaultValue::Bool(value) =&gt; value.to_tokens(tokens),
DefaultValue::String(<span class="kw-2">ref </span>value) =&gt; value.to_tokens(tokens),
DefaultValue::Bytes(<span class="kw-2">ref </span>value) =&gt; {
<span class="kw">let </span>byte_str = LitByteStr::new(value, Span::call_site());
tokens.append_all(<span class="macro">quote!</span>(#byte_str <span class="kw">as </span><span class="kw-2">&amp;</span>[u8]));
}
DefaultValue::Enumeration(<span class="kw-2">ref </span>value) =&gt; value.to_tokens(tokens),
DefaultValue::Path(<span class="kw-2">ref </span>value) =&gt; value.to_tokens(tokens),
}
}
}
</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>