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38 lines
6.9 KiB
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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="API documentation for the Rust `parenthesized` macro in crate `syn`."><meta name="keywords" content="rust, rustlang, rust-lang, parenthesized"><title>syn::parenthesized - 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><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 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</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><script>window.sidebarCurrent = {name: "parenthesized", ty: "macro", relpath: ""};</script><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" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><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><span class="help-button">?</span>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><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/group.rs.html#137-149" title="goto source code">[src]</a></span><span class="in-band">Macro <a href="index.html">syn</a>::<wbr><a class="macro" href="">parenthesized</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parenthesized</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span>:<span class="ident">ident</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> { ... };
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}</pre></div>
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</div><div class="docblock"><p>Parse a set of parentheses and expose their content to subsequent parsers.</p>
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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">syn</span>::{<span class="ident">parenthesized</span>, <span class="ident">token</span>, <span class="ident">Ident</span>, <span class="prelude-ty">Result</span>, <span class="ident">Token</span>, <span class="ident">Type</span>};
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>};
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">punctuated</span>::<span class="ident">Punctuated</span>;
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<span class="comment">// Parse a simplified tuple struct syntax like:</span>
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<span class="comment">//</span>
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<span class="comment">// struct S(A, B);</span>
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<span class="kw">struct</span> <span class="ident">TupleStruct</span> {
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<span class="ident">struct_token</span>: <span class="macro">Token</span><span class="macro">!</span>[<span class="kw">struct</span>],
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<span class="ident">ident</span>: <span class="ident">Ident</span>,
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<span class="ident">paren_token</span>: <span class="ident">token</span>::<span class="ident">Paren</span>,
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<span class="ident">fields</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">Type</span>, <span class="macro">Token</span><span class="macro">!</span>[,]<span class="op">></span>,
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<span class="ident">semi_token</span>: <span class="macro">Token</span><span class="macro">!</span>[;],
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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">TupleStruct</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="ident">content</span>;
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<span class="prelude-val">Ok</span>(<span class="ident">TupleStruct</span> {
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<span class="ident">struct_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>,
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<span class="ident">ident</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>,
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<span class="ident">paren_token</span>: <span class="macro">parenthesized</span><span class="macro">!</span>(<span class="ident">content</span> <span class="kw">in</span> <span class="ident">input</span>),
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<span class="ident">fields</span>: <span class="ident">content</span>.<span class="ident">parse_terminated</span>(<span class="ident">Type</span>::<span class="ident">parse</span>)<span class="question-mark">?</span>,
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<span class="ident">semi_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>,
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})
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}
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}</pre></div>
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