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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 `map` macro in crate `synom`."><meta name="keywords" content="rust, rustlang, rust-lang, map"><title>synom::map - 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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<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/synom/lib.rs.html#193-206" title="goto source code">[src]</a></span><span class="in-band">Macro <a href="index.html">synom</a>::<wbr><a class="macro" href="">map</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">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">$</span><span class="macro-nonterminal">g</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> { ... };
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(<span class="macro-nonterminal">$</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><span class="op">></span> { ... };
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}</pre></div>
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</div><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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<div class="example-wrap"><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="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="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="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></div>
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