23 lines
7.9 KiB
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23 lines
7.9 KiB
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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="Gets a number from the first parser, then applies the second parser that many times."><meta name="keywords" content="rust, rustlang, rust-lang, length_count"><title>length_count in nom::multi - 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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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::multi</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">multi</a>::<wbr><a class="fn" href="#">length_count</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/multi/mod.rs.html#1016-1047">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 length_count<I, O, N, E, F, G>(<br> f: F,<br> g: G<br>) -> impl <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(I) -> <a class="type" href="../type.IResult.html" title="type nom::IResult">IResult</a><I, <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><O>, E> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,<br> N: <a class="trait" href="../trait.ToUsize.html" title="trait nom::ToUsize">ToUsize</a>,<br> F: <a class="trait" href="../trait.Parser.html" title="trait nom::Parser">Parser</a><I, N, E>,<br> G: <a class="trait" href="../trait.Parser.html" title="trait nom::Parser">Parser</a><I, O, E>,<br> E: <a class="trait" href="../error/trait.ParseError.html" title="trait nom::error::ParseError">ParseError</a><I>, </span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Gets a number from the first parser,
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then applies the second parser that many times.</p>
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<h2 id="arguments"><a href="#arguments">Arguments</a></h2>
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<ul>
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<li><code>f</code> The parser to apply to obtain the count.</li>
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<li><code>g</code> The parser to apply repeatedly.</li>
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</ul>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">nom::number::complete::u8</span>;
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<span class="kw">use</span> <span class="ident">nom::multi::length_count</span>;
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<span class="kw">use</span> <span class="ident">nom::bytes::complete::tag</span>;
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<span class="kw">use</span> <span class="ident">nom::combinator::map</span>;
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<span class="kw">fn</span> <span class="ident">parser</span>(<span class="ident">s</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) -> <span class="ident">IResult</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span><span class="op">></span> {
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<span class="ident">length_count</span>(<span class="ident">map</span>(<span class="ident">u8</span>, <span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
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<span class="macro">println!</span>(<span class="string">"got number: {}"</span>, <span class="ident">i</span>);
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<span class="ident">i</span>
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}), <span class="ident">tag</span>(<span class="string">"abc"</span>))(<span class="ident">s</span>)
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}
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<span class="macro">assert_eq!</span>(<span class="ident">parser</span>(<span class="kw-2">&</span><span class="string">b"\x02abcabcabc"</span>[..]), <span class="prelude-val">Ok</span>(((<span class="kw-2">&</span><span class="string">b"abc"</span>[..], <span class="macro">vec!</span>[<span class="kw-2">&</span><span class="string">b"abc"</span>[..], <span class="kw-2">&</span><span class="string">b"abc"</span>[..]]))));
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<span class="macro">assert_eq!</span>(<span class="ident">parser</span>(<span class="string">b"\x03123123123"</span>), <span class="prelude-val">Err</span>(<span class="ident">Err::Error</span>(<span class="ident">Error::new</span>(<span class="kw-2">&</span><span class="string">b"123123123"</span>[..], <span class="ident">ErrorKind::Tag</span>))));</code></pre></div>
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