| <!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/syn-2.0.18/src/data.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>data.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="../../syn/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="../../syn/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 super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::punctuated::Punctuated; |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// An enum variant. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>Variant { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| |
| <span class="doccomment">/// Name of the variant. |
| </span><span class="kw">pub </span>ident: Ident, |
| |
| <span class="doccomment">/// Content stored in the variant. |
| </span><span class="kw">pub </span>fields: Fields, |
| |
| <span class="doccomment">/// Explicit discriminant: `Variant = 1` |
| </span><span class="kw">pub </span>discriminant: <span class="prelude-ty">Option</span><(<span class="macro">Token!</span>[=], Expr)>, |
| } |
| } |
| |
| <span class="macro">ast_enum_of_structs! </span>{ |
| <span class="doccomment">/// Data stored within an enum variant or struct. |
| /// |
| /// # Syntax tree enum |
| /// |
| /// This type is a [syntax tree enum]. |
| /// |
| /// [syntax tree enum]: Expr#syntax-tree-enums |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub enum </span>Fields { |
| <span class="doccomment">/// Named fields of a struct or struct variant such as `Point { x: f64, |
| /// y: f64 }`. |
| </span>Named(FieldsNamed), |
| |
| <span class="doccomment">/// Unnamed fields of a tuple struct or tuple variant such as `Some(T)`. |
| </span>Unnamed(FieldsUnnamed), |
| |
| <span class="doccomment">/// Unit struct or unit variant such as `None`. |
| </span>Unit, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// Named fields of a struct or struct variant such as `Point { x: f64, |
| /// y: f64 }`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>FieldsNamed { |
| <span class="kw">pub </span>brace_token: token::Brace, |
| <span class="kw">pub </span>named: Punctuated<Field, <span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// Unnamed fields of a tuple struct or tuple variant such as `Some(T)`. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>FieldsUnnamed { |
| <span class="kw">pub </span>paren_token: token::Paren, |
| <span class="kw">pub </span>unnamed: Punctuated<Field, <span class="macro">Token!</span>[,]>, |
| } |
| } |
| |
| <span class="kw">impl </span>Fields { |
| <span class="doccomment">/// Get an iterator over the borrowed [`Field`] items in this object. This |
| /// iterator can be used to iterate over a named or unnamed struct or |
| /// variant's fields uniformly. |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> punctuated::Iter<Field> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Fields::Unit => <span class="kw">crate</span>::punctuated::empty_punctuated_iter(), |
| Fields::Named(f) => f.named.iter(), |
| Fields::Unnamed(f) => f.unnamed.iter(), |
| } |
| } |
| |
| <span class="doccomment">/// Get an iterator over the mutably borrowed [`Field`] items in this |
| /// object. This iterator can be used to iterate over a named or unnamed |
| /// struct or variant's fields uniformly. |
| </span><span class="kw">pub fn </span>iter_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> punctuated::IterMut<Field> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Fields::Unit => <span class="kw">crate</span>::punctuated::empty_punctuated_iter_mut(), |
| Fields::Named(f) => f.named.iter_mut(), |
| Fields::Unnamed(f) => f.unnamed.iter_mut(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the number of fields. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Fields::Unit => <span class="number">0</span>, |
| Fields::Named(f) => f.named.len(), |
| Fields::Unnamed(f) => f.unnamed.len(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns `true` if there are zero fields. |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Fields::Unit => <span class="bool-val">true</span>, |
| Fields::Named(f) => f.named.is_empty(), |
| Fields::Unnamed(f) => f.unnamed.is_empty(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>IntoIterator <span class="kw">for </span>Fields { |
| <span class="kw">type </span>Item = Field; |
| <span class="kw">type </span>IntoIter = punctuated::IntoIter<Field>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Fields::Unit => Punctuated::<Field, ()>::new().into_iter(), |
| Fields::Named(f) => f.named.into_iter(), |
| Fields::Unnamed(f) => f.unnamed.into_iter(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Fields { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>Field; |
| <span class="kw">type </span>IntoIter = punctuated::Iter<<span class="lifetime">'a</span>, Field>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.iter() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Fields { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Field; |
| <span class="kw">type </span>IntoIter = punctuated::IterMut<<span class="lifetime">'a</span>, Field>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.iter_mut() |
| } |
| } |
| |
| <span class="macro">ast_struct! </span>{ |
| <span class="doccomment">/// A field of a struct or enum variant. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>))))] |
| </span><span class="kw">pub struct </span>Field { |
| <span class="kw">pub </span>attrs: Vec<Attribute>, |
| |
| <span class="kw">pub </span>vis: Visibility, |
| |
| <span class="kw">pub </span>mutability: FieldMutability, |
| |
| <span class="doccomment">/// Name of the field, if any. |
| /// |
| /// Fields of tuple structs have no names. |
| </span><span class="kw">pub </span>ident: <span class="prelude-ty">Option</span><Ident>, |
| |
| <span class="kw">pub </span>colon_token: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[:]>, |
| |
| <span class="kw">pub </span>ty: Type, |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>parsing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::ext::IdentExt; |
| <span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>}; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Variant { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>attrs = input.call(Attribute::parse_outer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>_visibility: Visibility = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>ident: Ident = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>fields = <span class="kw">if </span>input.peek(token::Brace) { |
| Fields::Named(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else if </span>input.peek(token::Paren) { |
| Fields::Unnamed(input.parse()<span class="question-mark">?</span>) |
| } <span class="kw">else </span>{ |
| Fields::Unit |
| }; |
| <span class="kw">let </span>discriminant = <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[=]) { |
| <span class="kw">let </span>eq_token: <span class="macro">Token!</span>[=] = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>discriminant: Expr = input.parse()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>((eq_token, discriminant)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| <span class="prelude-val">Ok</span>(Variant { |
| attrs, |
| ident, |
| fields, |
| discriminant, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>FieldsNamed { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>content; |
| <span class="prelude-val">Ok</span>(FieldsNamed { |
| brace_token: <span class="macro">braced!</span>(content <span class="kw">in </span>input), |
| named: content.parse_terminated(Field::parse_named, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>FieldsUnnamed { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="kw">let </span>content; |
| <span class="prelude-val">Ok</span>(FieldsUnnamed { |
| paren_token: <span class="macro">parenthesized!</span>(content <span class="kw">in </span>input), |
| unnamed: content.parse_terminated(Field::parse_unnamed, <span class="macro">Token!</span>[,])<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>Field { |
| <span class="doccomment">/// Parses a named (braced struct) field. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">pub fn </span>parse_named(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(Field { |
| attrs: input.call(Attribute::parse_outer)<span class="question-mark">?</span>, |
| vis: input.parse()<span class="question-mark">?</span>, |
| mutability: FieldMutability::None, |
| ident: <span class="prelude-val">Some</span>(<span class="kw">if </span>input.peek(<span class="macro">Token!</span>[<span class="kw">_</span>]) { |
| input.call(Ident::parse_any) |
| } <span class="kw">else </span>{ |
| input.parse() |
| }<span class="question-mark">?</span>), |
| colon_token: <span class="prelude-val">Some</span>(input.parse()<span class="question-mark">?</span>), |
| ty: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| |
| <span class="doccomment">/// Parses an unnamed (tuple struct) field. |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">pub fn </span>parse_unnamed(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(Field { |
| attrs: input.call(Attribute::parse_outer)<span class="question-mark">?</span>, |
| vis: input.parse()<span class="question-mark">?</span>, |
| mutability: FieldMutability::None, |
| ident: <span class="prelude-val">None</span>, |
| colon_token: <span class="prelude-val">None</span>, |
| ty: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">mod </span>printing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::print::TokensOrDefault; |
| <span class="kw">use </span>proc_macro2::TokenStream; |
| <span class="kw">use </span>quote::{ToTokens, TokenStreamExt}; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Variant { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.attrs); |
| <span class="self">self</span>.ident.to_tokens(tokens); |
| <span class="self">self</span>.fields.to_tokens(tokens); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((eq_token, disc)) = <span class="kw-2">&</span><span class="self">self</span>.discriminant { |
| eq_token.to_tokens(tokens); |
| disc.to_tokens(tokens); |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>FieldsNamed { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.brace_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.named.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>FieldsUnnamed { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="self">self</span>.paren_token.surround(tokens, |tokens| { |
| <span class="self">self</span>.unnamed.to_tokens(tokens); |
| }); |
| } |
| } |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Field { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| tokens.append_all(<span class="kw-2">&</span><span class="self">self</span>.attrs); |
| <span class="self">self</span>.vis.to_tokens(tokens); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ident) = <span class="kw-2">&</span><span class="self">self</span>.ident { |
| ident.to_tokens(tokens); |
| TokensOrDefault(<span class="kw-2">&</span><span class="self">self</span>.colon_token).to_tokens(tokens); |
| } |
| <span class="self">self</span>.ty.to_tokens(tokens); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |