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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="Logos"><title>logos - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="logos" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="logo-container" href="../logos/index.html"><img src="https://maciej.codes/kosz/logos.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../logos/index.html"><img src="https://maciej.codes/kosz/logos.png" alt="logo"></a><h2><a href="../logos/index.html">logos</a><span class="version">0.14.0</span></h2></div><div class="sidebar-elems"><ul class="block">
<li><a id="all-types" href="all.html">All Items</a></li></ul><section><ul class="block"><li><a href="#reexports">Re-exports</a></li><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li><li><a href="#types">Type Aliases</a></li><li><a href="#derives">Derive Macros</a></li></ul></section></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../logos/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Crate <a class="mod" href="#">logos</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/logos/lib.rs.html#1-270">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><img src="https://raw.githubusercontent.com/maciejhirsz/logos/master/logos.svg?sanitize=true" alt="Logos logo" width="250" align="right">
<h2 id="logos"><a href="#logos">Logos</a></h2>
<p><em>Create ridiculously fast Lexers.</em></p>
<p><strong>Logos</strong> has two goals:</p>
<ul>
<li>To make it easy to create a Lexer, so you can focus on more complex problems.</li>
<li>To make the generated Lexer faster than anything you’d write by hand.</li>
</ul>
<p>To achieve those, <strong>Logos</strong>:</p>
<ul>
<li>Combines all token definitions into a single <a href="https://en.wikipedia.org/wiki/Deterministic_finite_automaton">deterministic state machine</a>.</li>
<li>Optimizes branches into <a href="https://en.wikipedia.org/wiki/Lookup_table">lookup tables</a> or <a href="https://en.wikipedia.org/wiki/Branch_table">jump tables</a>.</li>
<li>Prevents <a href="https://en.wikipedia.org/wiki/ReDoS">backtracking</a> inside token definitions.</li>
<li><a href="https://en.wikipedia.org/wiki/Loop_unrolling">Unwinds loops</a>, and batches reads to minimize bounds checking.</li>
<li>Does all of that heavy lifting at compile time.</li>
</ul>
<p>See the <a href="https://maciejhirsz.github.io/logos/">Logos handbook</a> for additional documentation and usage examples.</p>
</div></details><h2 id="reexports" class="section-header"><a href="#reexports">Re-exports</a></h2><ul class="item-table"><li><div class="item-name" id="reexport.Source"><code>pub use crate::source::<a class="trait" href="source/trait.Source.html" title="trait logos::source::Source">Source</a>;</code></div></li></ul><h2 id="modules" class="section-header"><a href="#modules">Modules</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="source/index.html" title="mod logos::source">source</a></div><div class="desc docblock-short">This module contains a bunch of traits necessary for processing byte strings.</div></li></ul><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Lexer.html" title="struct logos::Lexer">Lexer</a></div><div class="desc docblock-short"><code>Lexer</code> is the main struct of the crate that allows you to read through a
<code>Source</code> and produce tokens for enums implementing the <code>Logos</code> trait.</div></li><li><div class="item-name"><a class="struct" href="struct.Skip.html" title="struct logos::Skip">Skip</a></div><div class="desc docblock-short">Type that can be returned from a callback, informing the <code>Lexer</code>, to skip
current token match. See also <a href="./fn.skip.html"><code>logos::skip</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.SpannedIter.html" title="struct logos::SpannedIter">SpannedIter</a></div><div class="desc docblock-short">Iterator that pairs tokens with their position in the source.</div></li></ul><h2 id="enums" class="section-header"><a href="#enums">Enums</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.Filter.html" title="enum logos::Filter">Filter</a></div><div class="desc docblock-short">Type that can be returned from a callback, either producing a field
for a token, or skipping it.</div></li><li><div class="item-name"><a class="enum" href="enum.FilterResult.html" title="enum logos::FilterResult">FilterResult</a></div><div class="desc docblock-short">Type that can be returned from a callback, either producing a field
for a token, skipping it, or emitting an error.</div></li></ul><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.Logos.html" title="trait logos::Logos">Logos</a></div><div class="desc docblock-short">Trait implemented for an enum representing all tokens. You should never have
to implement it manually, use the <code>#[derive(Logos)]</code> attribute on your enum.</div></li></ul><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.skip.html" title="fn logos::skip">skip</a></div><div class="desc docblock-short">Predefined callback that will inform the <code>Lexer</code> to skip a definition.</div></li></ul><h2 id="types" class="section-header"><a href="#types">Type Aliases</a></h2><ul class="item-table"><li><div class="item-name"><a class="type" href="type.Span.html" title="type logos::Span">Span</a></div><div class="desc docblock-short">Byte range in the source.</div></li></ul><h2 id="derives" class="section-header"><a href="#derives">Derive Macros</a></h2><ul class="item-table"><li><div class="item-name"><a class="derive" href="derive.Logos.html" title="derive logos::Logos">Logos</a></div></li></ul></section></div></main></body></html>
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