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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="winnow, making parsing a breeze"><title>winnow - 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="winnow" 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">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../winnow/index.html">winnow</a><span class="version">0.6.5</span></h2></div><div class="sidebar-elems"><ul class="block">
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<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="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></section></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../winnow/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="#">winnow</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/winnow/lib.rs.html#1-254">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><blockquote>
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<p>winnow, making parsing a breeze</p>
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</blockquote>
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<p><code>winnow</code> is a parser combinator library</p>
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<p>Quick links:</p>
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<ul>
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<li><a href="combinator/index.html" title="mod winnow::combinator">List of combinators</a></li>
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<li>[Tutorial][_tutorial::chapter_0]</li>
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<li>[Special Topics][_topic]</li>
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<li><a href="https://github.com/winnow-rs/winnow/discussions">Discussions</a></li>
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<li><a href="https://github.com/winnow-rs/winnow/blob/v0.6.5/CHANGELOG.md">CHANGELOG</a> (includes major version migration
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guides)</li>
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</ul>
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<h3 id="aspirations"><a href="#aspirations">Aspirations</a></h3>
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<p><code>winnow</code> aims to be your “do everything” parser, much like people treat regular expressions.</p>
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<p>In roughly priority order:</p>
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<ol>
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<li>Support writing parser declaratively while not getting in the way of imperative-style
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parsing when needed, working as an open-ended toolbox rather than a close-ended framework.</li>
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<li>Flexible enough to be used for any application, including parsing binary data, strings, or
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separate lexing and parsing phases</li>
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<li>Zero-cost abstractions, making it easy to write high performance parsers</li>
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<li>Easy to use, making it trivial for one-off uses</li>
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</ol>
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<p>In addition:</p>
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<ul>
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<li>Resilient maintainership, including
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<ul>
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<li>Willing to break compatibility rather than batching up breaking changes in large releases</li>
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<li>Leverage feature flags to keep one active branch</li>
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</ul>
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</li>
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<li>We will support the last 6 months of rust releases (MSRV, currently 1.64.0)</li>
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</ul>
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<p>See also [Special Topic: Why winnow?][crate::_topic::why]</p>
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<h3 id="example"><a href="#example">Example</a></h3>
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<p>Run</p>
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<div class="example-wrap"><pre class="language-console"><code>$ cargo add winnow
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</code></pre></div>
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<p>Then use it to parse:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>winnow::combinator::seq;
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<span class="kw">use </span>winnow::prelude::<span class="kw-2">*</span>;
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<span class="kw">use </span>winnow::token::take_while;
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<span class="attr">#[derive(Debug, Eq, PartialEq)]
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</span><span class="kw">pub struct </span>Color {
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<span class="kw">pub </span>red: u8,
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<span class="kw">pub </span>green: u8,
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<span class="kw">pub </span>blue: u8,
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}
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<span class="kw">impl </span>std::str::FromStr <span class="kw">for </span>Color {
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<span class="comment">// The error must be owned
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</span><span class="kw">type </span><span class="prelude-val">Err </span>= String;
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<span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Err> {
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hex_color.parse(s).map_err(|e| e.to_string())
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}
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}
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<span class="kw">pub fn </span>hex_color(input: <span class="kw-2">&mut &</span>str) -> PResult<Color> {
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<span class="macro">seq!</span>(Color {
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<span class="kw">_</span>: <span class="string">'#'</span>,
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red: hex_primary,
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green: hex_primary,
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blue: hex_primary
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})
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.parse_next(input)
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}
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<span class="kw">fn </span>hex_primary(input: <span class="kw-2">&mut &</span>str) -> PResult<u8> {
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take_while(<span class="number">2</span>, |c: char| c.is_ascii_hexdigit())
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.try_map(|input| u8::from_str_radix(input, <span class="number">16</span>))
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.parse_next(input)
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}</code></pre></div>
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<p>See also the [Tutorial][_tutorial::chapter_0] and [Special Topics][_topic]</p>
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</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.IResult"><code>pub use error::<a class="type" href="error/type.IResult.html" title="type winnow::error::IResult">IResult</a>;</code></div></li><li><div class="item-name" id="reexport.PResult"><code>pub use error::<a class="type" href="error/type.PResult.html" title="type winnow::error::PResult">PResult</a>;</code></div></li><li><div class="item-name" id="reexport.BStr"><code>pub use stream::<a class="struct" href="stream/struct.BStr.html" title="struct winnow::stream::BStr">BStr</a>;</code></div></li><li><div class="item-name" id="reexport.Bytes"><code>pub use stream::<a class="struct" href="stream/struct.Bytes.html" title="struct winnow::stream::Bytes">Bytes</a>;</code></div></li><li><div class="item-name" id="reexport.Located"><code>pub use stream::<a class="struct" href="stream/struct.Located.html" title="struct winnow::stream::Located">Located</a>;</code></div></li><li><div class="item-name" id="reexport.Partial"><code>pub use stream::<a class="struct" href="stream/struct.Partial.html" title="struct winnow::stream::Partial">Partial</a>;</code></div></li><li><div class="item-name" id="reexport.Stateful"><code>pub use stream::<a class="struct" href="stream/struct.Stateful.html" title="struct winnow::stream::Stateful">Stateful</a>;</code></div></li><li><div class="item-name" id="reexport.Str"><code>pub use stream::<a class="type" href="stream/type.Str.html" title="type winnow::stream::Str">Str</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="ascii/index.html" title="mod winnow::ascii">ascii</a></div><div class="desc docblock-short">Character specific parsers and combinators</div></li><li><div class="item-name"><a class="mod" href="binary/index.html" title="mod winnow::binary">binary</a></div><div class="desc docblock-short">Parsers recognizing numbers</div></li><li><div class="item-name"><a class="mod" href="combinator/index.html" title="mod winnow::combinator">combinator</a></div><div class="desc docblock-short">List of parsers and combinators</div></li><li><div class="item-name"><a class="mod" href="error/index.html" title="mod winnow::error">error</a></div><div class="desc docblock-short">Error management</div></li><li><div class="item-name"><a class="mod" href="prelude/index.html" title="mod winnow::prelude">prelude</a></div><div class="desc docblock-short">Core concepts available for glob import</div></li><li><div class="item-name"><a class="mod" href="stream/index.html" title="mod winnow::stream">stream</a></div><div class="desc docblock-short">Stream capability for combinators to parse</div></li><li><div class="item-name"><a class="mod" href="token/index.html" title="mod winnow::token">token</a></div><div class="desc docblock-short">Parsers extracting tokens from the stream</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.Parser.html" title="trait winnow::Parser">Parser</a></div><div class="desc docblock-short">Core trait for parsing</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.unpeek.html" title="fn winnow::unpeek">unpeek</a></div><div class="desc docblock-short">Convert a <a href="trait.Parser.html#method.parse_peek" title="method winnow::Parser::parse_peek"><code>Parser::parse_peek</code></a> style parse function to be a <a href="trait.Parser.html" title="trait winnow::Parser"><code>Parser</code></a></div></li></ul></section></div></main></body></html>
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