161 lines
6.9 KiB
HTML
161 lines
6.9 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `custom_keyword` macro in crate `syn`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, custom_keyword">
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<title>syn::custom_keyword - Rust</title>
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<body class="rustdoc macro">
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This old browser is unsupported and will most likely display funky
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things.
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<![endif]-->
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<nav class="sidebar">
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<div class="sidebar-menu">☰</div>
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<p class='location'><a href='index.html'>syn</a></p><script>window.sidebarCurrent = {name: 'custom_keyword', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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autocomplete="off"
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type="search">
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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=''>custom_keyword</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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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#1294-1307' 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">custom_keyword</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">keyword</span>:<span class="ident">ident</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Parse the given word as a keyword.</p>
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<p>For words that are keywords in the Rust language, it is better to use the
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<a href="macro.keyword.html"><code>keyword!</code></a> parser which returns a unique type for each keyword.</p>
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<ul>
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<li><strong>Syntax:</strong> <code>custom_keyword!(KEYWORD)</code></li>
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<li><strong>Output:</strong> <code>Ident</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">Ident</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">synom</span>::<span class="ident">Synom</span>;
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<span class="kw">struct</span> <span class="ident">Flag</span> {
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<span class="ident">name</span>: <span class="ident">Ident</span>,
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}
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<span class="comment">// Parses the custom keyword `flag` followed by any name for a flag.</span>
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<span class="comment">//</span>
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<span class="comment">// Example: `flag Verbose`</span>
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<span class="kw">impl</span> <span class="ident">Synom</span> <span class="kw">for</span> <span class="ident">Flag</span> {
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<span class="macro">named</span><span class="macro">!</span>(<span class="ident">parse</span> <span class="op">-></span> <span class="ident">Flag</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
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<span class="macro">custom_keyword</span><span class="macro">!</span>(<span class="ident">flag</span>) <span class="op">>></span>
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<span class="ident">name</span>: <span class="macro">syn</span><span class="macro">!</span>(<span class="ident">Ident</span>) <span class="op">>></span>
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(<span class="ident">Flag</span> { <span class="ident">name</span> })
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));
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}</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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<section id='search' class="content hidden"></section>
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<section class="footer"></section>
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<aside id="help" class="hidden">
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<div>
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dt><kbd>?</kbd></dt>
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<dd>Show this help dialog</dd>
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<dd>Focus the search field</dd>
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<dd>Move up in search results</dd>
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<dd>Move down in search results</dd>
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<dd>Collapse all sections</dd>
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</dl>
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</div>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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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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</p>
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</div>
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</div>
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</aside>
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<script>
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window.rootPath = "../";
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window.currentCrate = "syn";
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</script>
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<script src="../main.js"></script>
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<script defer src="../search-index.js"></script>
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</html>
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