| <!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="Parse a set of square brackets and expose their content to subsequent parsers."><meta name="keywords" content="rust, rustlang, rust-lang, bracketed"><title>bracketed in syn - Rust</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" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script> |
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| <h1 class="fqn"><span class="in-band">Macro <a href="index.html">syn</a>::<wbr><a class="macro" href="#">bracketed</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"> |
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| <div class="docblock item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules!</span> <span class="ident">bracketed</span> { |
| (<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>) => { ... }; |
| }</code></pre></div> |
| </div><div class="item-info"><div class="stab portability">This is supported on <strong>crate feature <code>parsing</code></strong> only.</div></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse a set of square brackets and expose their content to subsequent |
| parsers.</p> |
| <h2 id="example" class="section-header"><a href="#example">Example</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">proc_macro2::TokenStream</span>; |
| <span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">bracketed</span>, <span class="ident">token</span>, <span class="prelude-ty">Result</span>, <span class="ident">Token</span>}; |
| <span class="kw">use</span> <span class="ident">syn::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>}; |
| |
| <span class="comment">// Parse an outer attribute like:</span> |
| <span class="comment">//</span> |
| <span class="comment">// #[repr(C, packed)]</span> |
| <span class="kw">struct</span> <span class="ident">OuterAttribute</span> { |
| <span class="ident">pound_token</span>: <span class="macro">Token!</span>[#], |
| <span class="ident">bracket_token</span>: <span class="ident">token::Bracket</span>, |
| <span class="ident">content</span>: <span class="ident">TokenStream</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">OuterAttribute</span> { |
| <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">content</span>; |
| <span class="prelude-val">Ok</span>(<span class="ident">OuterAttribute</span> { |
| <span class="ident">pound_token</span>: <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| <span class="ident">bracket_token</span>: <span class="macro">bracketed!</span>(<span class="ident">content</span> <span class="kw">in</span> <span class="ident">input</span>), |
| <span class="ident">content</span>: <span class="ident">content</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>, |
| }) |
| } |
| }</code></pre></div> |
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