| <!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/custom_keyword.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>custom_keyword.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="doccomment">/// Define a type that supports parsing and printing a given identifier as if it |
| /// were a keyword. |
| /// |
| /// # Usage |
| /// |
| /// As a convention, it is recommended that this macro be invoked within a |
| /// module called `kw` or `keyword` and that the resulting parser be invoked |
| /// with a `kw::` or `keyword::` prefix. |
| /// |
| /// ``` |
| /// mod kw { |
| /// syn::custom_keyword!(whatever); |
| /// } |
| /// ``` |
| /// |
| /// The generated syntax tree node supports the following operations just like |
| /// any built-in keyword token. |
| /// |
| /// - [Peeking] — `input.peek(kw::whatever)` |
| /// |
| /// - [Parsing] — `input.parse::<kw::whatever>()?` |
| /// |
| /// - [Printing] — `quote!( ... #whatever_token ... )` |
| /// |
| /// - Construction from a [`Span`] — `let whatever_token = kw::whatever(sp)` |
| /// |
| /// - Field access to its span — `let sp = whatever_token.span` |
| /// |
| /// [Peeking]: crate::parse::ParseBuffer::peek |
| /// [Parsing]: crate::parse::ParseBuffer::parse |
| /// [Printing]: quote::ToTokens |
| /// [`Span`]: proc_macro2::Span |
| /// |
| /// # Example |
| /// |
| /// This example parses input that looks like `bool = true` or `str = "value"`. |
| /// The key must be either the identifier `bool` or the identifier `str`. If |
| /// `bool`, the value may be either `true` or `false`. If `str`, the value may |
| /// be any string literal. |
| /// |
| /// The symbols `bool` and `str` are not reserved keywords in Rust so these are |
| /// not considered keywords in the `syn::token` module. Like any other |
| /// identifier that is not a keyword, these can be declared as custom keywords |
| /// by crates that need to use them as such. |
| /// |
| /// ``` |
| /// use syn::{LitBool, LitStr, Result, Token}; |
| /// use syn::parse::{Parse, ParseStream}; |
| /// |
| /// mod kw { |
| /// syn::custom_keyword!(bool); |
| /// syn::custom_keyword!(str); |
| /// } |
| /// |
| /// enum Argument { |
| /// Bool { |
| /// bool_token: kw::bool, |
| /// eq_token: Token![=], |
| /// value: LitBool, |
| /// }, |
| /// Str { |
| /// str_token: kw::str, |
| /// eq_token: Token![=], |
| /// value: LitStr, |
| /// }, |
| /// } |
| /// |
| /// impl Parse for Argument { |
| /// fn parse(input: ParseStream) -> Result<Self> { |
| /// let lookahead = input.lookahead1(); |
| /// if lookahead.peek(kw::bool) { |
| /// Ok(Argument::Bool { |
| /// bool_token: input.parse::<kw::bool>()?, |
| /// eq_token: input.parse()?, |
| /// value: input.parse()?, |
| /// }) |
| /// } else if lookahead.peek(kw::str) { |
| /// Ok(Argument::Str { |
| /// str_token: input.parse::<kw::str>()?, |
| /// eq_token: input.parse()?, |
| /// value: input.parse()?, |
| /// }) |
| /// } else { |
| /// Err(lookahead.error()) |
| /// } |
| /// } |
| /// } |
| /// ``` |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => { |
| <span class="attribute">#[allow(non_camel_case_types)] |
| </span><span class="kw">pub struct </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">pub </span>span: <span class="macro-nonterminal">$crate::__private::Span</span>, |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[allow(dead_code, non_snake_case)] |
| </span><span class="kw">pub fn </span><span class="macro-nonterminal">$ident</span><__S: <span class="macro-nonterminal">$crate::__private::IntoSpans</span><<span class="macro-nonterminal">$crate::__private::Span</span>>>( |
| span: __S, |
| ) -> <span class="macro-nonterminal">$ident </span>{ |
| <span class="macro-nonterminal">$ident </span>{ |
| span: <span class="macro-nonterminal">$crate::__private::IntoSpans::into_spans</span>(span), |
| } |
| } |
| |
| <span class="kw">const _</span>: () = { |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::Default </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="macro-nonterminal">$ident </span>{ |
| span: <span class="macro-nonterminal">$crate::__private::Span::call_site</span>(), |
| } |
| } |
| } |
| |
| <span class="macro-nonterminal">$</span><span class="macro">crate::impl_parse_for_custom_keyword!</span>(<span class="macro-nonterminal">$ident</span>); |
| <span class="macro-nonterminal">$</span><span class="macro">crate::impl_to_tokens_for_custom_keyword!</span>(<span class="macro-nonterminal">$ident</span>); |
| <span class="macro-nonterminal">$</span><span class="macro">crate::impl_clone_for_custom_keyword!</span>(<span class="macro-nonterminal">$ident</span>); |
| <span class="macro-nonterminal">$</span><span class="macro">crate::impl_extra_traits_for_custom_keyword!</span>(<span class="macro-nonterminal">$ident</span>); |
| }; |
| }; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_parse_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => { |
| <span class="comment">// For peek. |
| </span><span class="kw">impl </span><span class="macro-nonterminal">$crate::token::CustomToken </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>peek(cursor: <span class="macro-nonterminal">$crate::buffer::Cursor</span>) -> <span class="macro-nonterminal">$crate::__private::bool </span>{ |
| <span class="kw">if let </span><span class="macro-nonterminal">$crate::__private::Some</span>((ident, _rest)) = cursor.ident() { |
| ident == <span class="macro-nonterminal">$</span><span class="macro">crate::__private::stringify!</span>(<span class="macro-nonterminal">$ident</span>) |
| } <span class="kw">else </span>{ |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="kw">fn </span>display() -> <span class="kw-2">&</span><span class="lifetime">'static </span><span class="macro-nonterminal">$crate::__private::str </span>{ |
| <span class="macro-nonterminal">$</span><span class="macro">crate::__private::concat!</span>(<span class="string">"`"</span>, <span class="macro-nonterminal">$</span><span class="macro">crate::__private::stringify!</span>(<span class="macro-nonterminal">$ident</span>), <span class="string">"`"</span>) |
| } |
| } |
| |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::parse::Parse </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>parse(input: <span class="macro-nonterminal">$crate::parse::ParseStream</span>) -> <span class="macro-nonterminal">$crate::parse::Result</span><<span class="macro-nonterminal">$ident</span>> { |
| input.step(|cursor| { |
| <span class="kw">if let </span><span class="macro-nonterminal">$crate::__private::Some</span>((ident, rest)) = cursor.ident() { |
| <span class="kw">if </span>ident == <span class="macro-nonterminal">$</span><span class="macro">crate::__private::stringify!</span>(<span class="macro-nonterminal">$ident</span>) { |
| <span class="kw">return </span><span class="macro-nonterminal">$crate::__private::Ok</span>((<span class="macro-nonterminal">$ident </span>{ span: ident.span() }, rest)); |
| } |
| } |
| <span class="macro-nonterminal">$crate::__private::Err</span>(cursor.error(<span class="macro-nonterminal">$</span><span class="macro">crate::__private::concat!</span>( |
| <span class="string">"expected `"</span>, |
| <span class="macro-nonterminal">$</span><span class="macro">crate::__private::stringify!</span>(<span class="macro-nonterminal">$ident</span>), |
| <span class="string">"`"</span>, |
| ))) |
| }) |
| } |
| } |
| }; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(not(feature = <span class="string">"parsing"</span>))] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_parse_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => {}; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_to_tokens_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::ToTokens </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span><span class="macro-nonterminal">$crate::__private::TokenStream2</span>) { |
| <span class="kw">let </span>ident = <span class="macro-nonterminal">$crate::Ident::new</span>(<span class="macro-nonterminal">$</span><span class="macro">crate::__private::stringify!</span>(<span class="macro-nonterminal">$ident</span>), <span class="self">self</span>.span); |
| <span class="macro-nonterminal">$crate::__private::TokenStreamExt::append</span>(tokens, ident); |
| } |
| } |
| }; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(not(feature = <span class="string">"printing"</span>))] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_to_tokens_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => {}; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"clone-impls"</span>)] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_clone_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::Copy </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{} |
| |
| <span class="attribute">#[allow(clippy::expl_impl_clone_on_copy)] |
| </span><span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::Clone </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw-2">*</span><span class="self">self |
| </span>} |
| } |
| }; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(not(feature = <span class="string">"clone-impls"</span>))] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_clone_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => {}; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"extra-traits"</span>)] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_extra_traits_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => { |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::Debug </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span><span class="macro-nonterminal">$crate::__private::Formatter</span>) -> <span class="macro-nonterminal">$crate::__private::fmt::Result </span>{ |
| <span class="macro-nonterminal">$crate::__private::Formatter::write_str</span>( |
| f, |
| <span class="macro-nonterminal">$</span><span class="macro">crate::__private::concat!</span>( |
| <span class="string">"Keyword ["</span>, |
| <span class="macro-nonterminal">$</span><span class="macro">crate::__private::stringify!</span>(<span class="macro-nonterminal">$ident</span>), |
| <span class="string">"]"</span>, |
| ), |
| ) |
| } |
| } |
| |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::Eq </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{} |
| |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::PartialEq </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, _other: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="macro-nonterminal">$crate::__private::bool </span>{ |
| <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::__private::Hash </span><span class="kw">for </span><span class="macro-nonterminal">$ident </span>{ |
| <span class="kw">fn </span>hash<__H: <span class="macro-nonterminal">$crate::__private::Hasher</span>>(<span class="kw-2">&</span><span class="self">self</span>, _state: <span class="kw-2">&mut </span>__H) {} |
| } |
| }; |
| } |
| |
| <span class="comment">// Not public API. |
| </span><span class="attribute">#[cfg(not(feature = <span class="string">"extra-traits"</span>))] |
| #[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>impl_extra_traits_for_custom_keyword { |
| (<span class="macro-nonterminal">$ident</span>:ident) => {}; |
| } |
| </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> |
