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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="Define a type that supports parsing and printing a multi-character symbol as if it were a punctuation token."><meta name="keywords" content="rust, rustlang, rust-lang, custom_punctuation"><title>custom_punctuation in syn - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><script src="../crates.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../syn/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="index.html">syn</a></p><div id="sidebar-vars" data-name="custom_punctuation" data-ty="macro" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Macro <a href="index.html">syn</a>::<wbr><a class="macro" href="">custom_punctuation</a><button id="copy-path" onclick="copy_path(this)">⎘</button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/syn/custom_punctuation.rs.html#78-106" title="goto source code">[src]</a></span></h1><div class="docblock type-decl"><div class="example-wrap"><pre class="rust macro">
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<span class="macro">macro_rules!</span> <span class="ident">custom_punctuation</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ident</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=</span><span class="op">></span> { ... };
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}</pre></div>
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</div><div class="docblock"><p>Define a type that supports parsing and printing a multi-character symbol
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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="Define a type that supports parsing and printing a multi-character symbol as if it were a punctuation token."><title>custom_punctuation in syn - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-46132b98.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="syn" data-themes="" data-resource-suffix="" data-rustdoc-version="1.85.1 (4eb161250 2025-03-15)" data-channel="1.85.1" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../syn/index.html">syn</a><span class="version">2.0.100</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">custom_<wbr>punctuation</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#usage" title="Usage">Usage</a></li><li><a href="#example" title="Example">Example</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate syn</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">syn</a></span><h1>Macro <span class="macro">custom_punctuation</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/syn/custom_punctuation.rs.html#78-109">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! custom_punctuation {
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($ident:ident, $($tt:tt)+) => { ... };
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Define a type that supports parsing and printing a multi-character symbol
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as if it were a punctuation token.</p>
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<h1 id="usage" class="section-header"><a href="#usage">Usage</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="macro">syn::custom_punctuation!</span>(<span class="ident">LeftRightArrow</span>, <span class="op"><</span><span class="op">=</span><span class="op">></span>);</pre></div>
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<h2 id="usage"><a class="doc-anchor" href="#usage">§</a>Usage</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">syn::custom_punctuation!</span>(LeftRightArrow, <=>);</code></pre></div>
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<p>The generated syntax tree node supports the following operations just like
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any built-in punctuation token.</p>
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<ul>
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<li>
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<p><a href="parse/struct.ParseBuffer.html#method.peek">Peeking</a> — <code>input.peek(LeftRightArrow)</code></p>
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<p><a href="parse/struct.ParseBuffer.html#method.peek" title="method syn::parse::ParseBuffer::peek">Peeking</a> — <code>input.peek(LeftRightArrow)</code></p>
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</li>
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<li>
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<p><a href="parse/struct.ParseBuffer.html#method.parse">Parsing</a> — <code>input.parse::<LeftRightArrow>()?</code></p>
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<p><a href="parse/struct.ParseBuffer.html#method.parse" title="method syn::parse::ParseBuffer::parse">Parsing</a> — <code>input.parse::<LeftRightArrow>()?</code></p>
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</li>
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<li>
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<p><a href="../quote/to_tokens/trait.ToTokens.html">Printing</a> — <code>quote!( ... #lrarrow ... )</code></p>
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<p><a href="../quote/to_tokens/trait.ToTokens.html" title="trait quote::to_tokens::ToTokens">Printing</a> — <code>quote!( ... #lrarrow ... )</code></p>
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</li>
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<li>
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<p>Construction from a <a href="../proc_macro2/struct.Span.html"><code>Span</code></a> — <code>let lrarrow = LeftRightArrow(sp)</code></p>
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<p>Construction from a <a href="../proc_macro2/struct.Span.html" title="struct proc_macro2::Span"><code>Span</code></a> — <code>let lrarrow = LeftRightArrow(sp)</code></p>
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</li>
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<li>
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<p>Construction from multiple <a href="../proc_macro2/struct.Span.html"><code>Span</code></a> — <code>let lrarrow = LeftRightArrow([sp, sp, sp])</code></p>
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<p>Construction from multiple <a href="../proc_macro2/struct.Span.html" title="struct proc_macro2::Span"><code>Span</code></a> — <code>let lrarrow = LeftRightArrow([sp, sp, sp])</code></p>
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</li>
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<li>
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<p>Field access to its spans — <code>let spans = lrarrow.spans</code></p>
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</li>
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</ul>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">TokenStream</span>, <span class="ident">TokenTree</span>};
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<span class="kw">use</span> <span class="ident">syn::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="ident">Peek</span>, <span class="prelude-ty">Result</span>};
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<span class="kw">use</span> <span class="ident">syn::punctuated::Punctuated</span>;
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<span class="kw">use</span> <span class="ident">syn::Expr</span>;
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<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>proc_macro2::{TokenStream, TokenTree};
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<span class="kw">use </span>syn::parse::{Parse, ParseStream, Peek, <span class="prelude-ty">Result</span>};
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<span class="kw">use </span>syn::punctuated::Punctuated;
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<span class="kw">use </span>syn::Expr;
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<span class="macro">syn::custom_punctuation!</span>(<span class="ident">PathSeparator</span>, <span class="op"><</span><span class="op">/</span><span class="op">></span>);
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<span class="macro">syn::custom_punctuation!</span>(PathSeparator, </>);
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<span class="comment">// expr </> expr </> expr ...</span>
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<span class="kw">struct</span> <span class="ident">PathSegments</span> {
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<span class="ident">segments</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">Expr</span>, <span class="ident">PathSeparator</span><span class="op">></span>,
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<span class="comment">// expr </> expr </> expr ...
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</span><span class="kw">struct </span>PathSegments {
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segments: Punctuated<Expr, PathSeparator>,
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}
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<span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">PathSegments</span> {
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<span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">segments</span> <span class="op">=</span> <span class="ident">Punctuated::new</span>();
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<span class="kw">impl </span>Parse <span class="kw">for </span>PathSegments {
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<span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> {
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<span class="kw">let </span><span class="kw-2">mut </span>segments = Punctuated::new();
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<span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="ident">parse_until</span>(<span class="ident">input</span>, <span class="ident">PathSeparator</span>)<span class="question-mark">?</span>;
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<span class="ident">segments</span>.<span class="ident">push_value</span>(<span class="ident">syn::parse2</span>(<span class="ident">first</span>)<span class="question-mark">?</span>);
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<span class="kw">let </span>first = parse_until(input, PathSeparator)<span class="question-mark">?</span>;
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segments.push_value(syn::parse2(first)<span class="question-mark">?</span>);
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<span class="kw">while</span> <span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">PathSeparator</span>) {
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<span class="ident">segments</span>.<span class="ident">push_punct</span>(<span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>);
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<span class="kw">while </span>input.peek(PathSeparator) {
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segments.push_punct(input.parse()<span class="question-mark">?</span>);
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<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="ident">parse_until</span>(<span class="ident">input</span>, <span class="ident">PathSeparator</span>)<span class="question-mark">?</span>;
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<span class="ident">segments</span>.<span class="ident">push_value</span>(<span class="ident">syn::parse2</span>(<span class="ident">next</span>)<span class="question-mark">?</span>);
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<span class="kw">let </span>next = parse_until(input, PathSeparator)<span class="question-mark">?</span>;
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segments.push_value(syn::parse2(next)<span class="question-mark">?</span>);
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}
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<span class="prelude-val">Ok</span>(<span class="ident">PathSegments</span> { <span class="ident">segments</span> })
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<span class="prelude-val">Ok</span>(PathSegments { segments })
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}
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}
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<span class="kw">fn</span> <span class="ident">parse_until</span><span class="op"><</span><span class="ident">E</span>: <span class="ident">Peek</span><span class="op">></span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>, <span class="ident">end</span>: <span class="ident">E</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">TokenStream</span><span class="op">></span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="ident">TokenStream::new</span>();
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<span class="kw">while</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">is_empty</span>() <span class="op">&&</span> <span class="op">!</span><span class="ident">input</span>.<span class="ident">peek</span>(<span class="ident">end</span>) {
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<span class="kw">let</span> <span class="ident">next</span>: <span class="ident">TokenTree</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
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<span class="ident">tokens</span>.<span class="ident">extend</span>(<span class="prelude-val">Some</span>(<span class="ident">next</span>));
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<span class="kw">fn </span>parse_until<E: Peek>(input: ParseStream, end: E) -> <span class="prelude-ty">Result</span><TokenStream> {
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<span class="kw">let </span><span class="kw-2">mut </span>tokens = TokenStream::new();
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<span class="kw">while </span>!input.is_empty() && !input.peek(end) {
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<span class="kw">let </span>next: TokenTree = input.parse()<span class="question-mark">?</span>;
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tokens.extend(<span class="prelude-val">Some</span>(next));
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}
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<span class="prelude-val">Ok</span>(<span class="ident">tokens</span>)
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<span class="prelude-val">Ok</span>(tokens)
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}
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="string">r#" a::b </> c::d::e "#</span>;
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<span class="kw">let</span> <span class="kw">_</span>: <span class="ident">PathSegments</span> <span class="op">=</span> <span class="ident">syn::parse_str</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>();
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}</pre></div>
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</div></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="syn" data-search-index-js="../search-index.js" data-search-js="../search.js"></div>
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<script src="../main.js"></script></body></html>
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<span class="kw">fn </span>main() {
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<span class="kw">let </span>input = <span class="string">r#" a::b </> c::d::e "#</span>;
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<span class="kw">let _</span>: PathSegments = syn::parse_str(input).unwrap();
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}</code></pre></div>
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</div></details></section></div></main></body></html>
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