152 lines
7.4 KiB
HTML
152 lines
7.4 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="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `map` macro in crate `synom`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, map">
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<title>synom::map - Rust</title>
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<link rel="stylesheet" type="text/css" href="../normalize.css">
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<body class="rustdoc macro">
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<!--[if lte IE 8]>
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<div class="warning">
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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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<p class='location'><a href='index.html'>synom</a></p><script>window.sidebarCurrent = {name: 'map', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<form class="search-form js-only">
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<div class="search-container">
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<input class="search-input" name="search"
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</form>
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</nav>
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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'>synom</a>::<wbr><a class="macro" href=''>map</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/synom/lib.rs.html#193-206' 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">map</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="macro-nonterminal">$</span><span class="macro-nonterminal">g</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">f</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">g</span>:<span class="ident">expr</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Transform the result of a parser by applying a function or closure.</p>
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<ul>
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<li><strong>Syntax:</strong> <code>map!(THING, FN)</code></li>
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<li><strong>Output:</strong> the return type of function FN applied to THING</li>
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</ul>
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<pre class="rust rust-example-rendered">
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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="attribute">#[<span class="ident">macro_use</span>]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">synom</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Item</span>, <span class="ident">Ident</span>};
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::<span class="ident">item</span>;
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<span class="kw">fn</span> <span class="ident">get_item_ident</span>(<span class="ident">item</span>: <span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Ident</span> {
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<span class="ident">item</span>.<span class="ident">ident</span>
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}
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<span class="comment">// Parses an item and returns the name (identifier) of the item only.</span>
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<span class="macro">named</span><span class="macro">!</span>(<span class="ident">item_ident</span> <span class="op">-></span> <span class="ident">Ident</span>,
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<span class="macro">map</span><span class="macro">!</span>(<span class="ident">item</span>, <span class="ident">get_item_ident</span>)
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);
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<span class="comment">// Or equivalently:</span>
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<span class="macro">named</span><span class="macro">!</span>(<span class="ident">item_ident2</span> <span class="op">-></span> <span class="ident">Ident</span>,
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<span class="macro">map</span><span class="macro">!</span>(<span class="ident">item</span>, <span class="op">|</span><span class="ident">i</span>: <span class="ident">Item</span><span class="op">|</span> <span class="ident">i</span>.<span class="ident">ident</span>)
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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">"fn foo() {}"</span>;
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<span class="kw">let</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="ident">item_ident</span>(<span class="ident">input</span>).<span class="ident">expect</span>(<span class="string">"item"</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>, <span class="string">"foo"</span>);
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}</pre>
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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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<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>?</dt>
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<dd>Show this help dialog</dd>
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<dt>S</dt>
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<dd>Focus the search field</dd>
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<dt>⇤</dt>
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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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</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 = "synom";
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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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