153 lines
6.8 KiB
HTML
153 lines
6.8 KiB
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<meta name="keywords" content="rust, rustlang, rust-lang, braces">
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<title>syn::braces - Rust</title>
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<p class='location'><a href='index.html'>syn</a></p><script>window.sidebarCurrent = {name: 'braces', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>syn</a>::<wbr><a class="macro" href=''>braces</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/syn/parsers.rs.html#1407-1415' title='goto source code'>[src]</a></span></h1>
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<pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">braces</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Parse inside of <code>{</code> <code>}</code> curly braces.</p>
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<p>This macro parses a set of balanced braces and invokes a sub-parser on the
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content inside. The sub-parser is required to consume all tokens within the
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braces in order for this parser to return successfully.</p>
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<ul>
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<li><strong>Syntax:</strong> <code>braces!(CONTENT)</code></li>
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<li><strong>Output:</strong> <code>(token::Brace, CONTENT)</code></li>
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</ul>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Expr</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">token</span>::<span class="ident">Brace</span>;
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<span class="doccomment">/// Parses an expression inside of braces.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// Example: `{1 + 1}`</span>
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<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_paren</span> <span class="op">-></span> (<span class="ident">Brace</span>, <span class="ident">Expr</span>), <span class="macro">braces</span><span class="macro">!</span>(<span class="macro">syn</span><span class="macro">!</span>(<span class="ident">Expr</span>)));</pre>
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<p><em>This macro is available if Syn is built with the <code>"parsing"</code> feature.</em></p>
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</div></section>
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<h2>Keyboard Shortcuts</h2>
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<h2>Search Tricks</h2>
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Prefix searches with a type followed by a colon (e.g.
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Accepted types are: <code>fn</code>, <code>mod</code>,
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and <code>const</code>.
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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