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19 lines
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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="Returns the longest slice of the matches the pattern."><meta name="keywords" content="rust, rustlang, rust-lang, is_a"><title>is_a in nom::bytes::streaming - 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 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unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../../nom/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../../nom/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In nom::bytes::streaming</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../../nom/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../../index.html">nom</a>::<wbr><a href="../index.html">bytes</a>::<wbr><a href="index.html">streaming</a>::<wbr><a class="fn" href="#">is_a</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"><a class="srclink" href="../../../src/nom/bytes/streaming.rs.html#153-164">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn is_a<T, Input, Error: <a class="trait" href="../../error/trait.ParseError.html" title="trait nom::error::ParseError">ParseError</a><Input>>(<br> arr: T<br>) -> impl <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(Input) -> <a class="type" href="../../type.IResult.html" title="type nom::IResult">IResult</a><Input, Input, Error> <span class="where fmt-newline">where<br> Input: <a class="trait" href="../../trait.InputTakeAtPosition.html" title="trait nom::InputTakeAtPosition">InputTakeAtPosition</a>,<br> T: <a class="trait" href="../../trait.FindToken.html" title="trait nom::FindToken">FindToken</a><<Input as <a class="trait" href="../../trait.InputTakeAtPosition.html" title="trait nom::InputTakeAtPosition">InputTakeAtPosition</a>>::<a class="associatedtype" href="../../trait.InputTakeAtPosition.html#associatedtype.Item" title="type nom::InputTakeAtPosition::Item">Item</a>>, </span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Returns the longest slice of the matches the pattern.</p>
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<p>The parser will return the longest slice consisting of the characters in provided in the
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combinator’s argument.</p>
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<h2 id="streaming-specific"><a href="#streaming-specific">Streaming specific</a></h2>
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<p><em>Streaming version</em> will return a <code>Err::Incomplete(Needed::new(1))</code> if the pattern wasn’t met
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or if the pattern reaches the end of the input.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">nom::bytes::streaming::is_a</span>;
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<span class="kw">fn</span> <span class="ident">hex</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="ident">IResult</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> {
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<span class="ident">is_a</span>(<span class="string">"1234567890ABCDEF"</span>)(<span class="ident">s</span>)
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}
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<span class="macro">assert_eq!</span>(<span class="ident">hex</span>(<span class="string">"123 and voila"</span>), <span class="prelude-val">Ok</span>((<span class="string">" and voila"</span>, <span class="string">"123"</span>)));
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<span class="macro">assert_eq!</span>(<span class="ident">hex</span>(<span class="string">"DEADBEEF and others"</span>), <span class="prelude-val">Ok</span>((<span class="string">" and others"</span>, <span class="string">"DEADBEEF"</span>)));
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<span class="macro">assert_eq!</span>(<span class="ident">hex</span>(<span class="string">"BADBABEsomething"</span>), <span class="prelude-val">Ok</span>((<span class="string">"something"</span>, <span class="string">"BADBABE"</span>)));
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<span class="macro">assert_eq!</span>(<span class="ident">hex</span>(<span class="string">"D15EA5E"</span>), <span class="prelude-val">Err</span>(<span class="ident">Err::Incomplete</span>(<span class="ident">Needed::new</span>(<span class="number">1</span>))));
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<span class="macro">assert_eq!</span>(<span class="ident">hex</span>(<span class="string">""</span>), <span class="prelude-val">Err</span>(<span class="ident">Err::Incomplete</span>(<span class="ident">Needed::new</span>(<span class="number">1</span>))));</code></pre></div>
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