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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="Error management"><title>winnow::error - Rust</title><script> if (window.location.protocol !== "file:") document.write(`<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">`)</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-e935ef01ae1c1829.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="1.78.0 (9b00956e5 2024-04-29)" data-channel="1.78.0" data-search-js="search-42d8da7a6b9792c2.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-4c98445ec4002617.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-12cf3b4f4f9dc36d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-04d5337699b92874.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"><!--[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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../winnow/index.html">winnow</a><span class="version">0.6.8</span></h2></div><h2 class="location"><a href="#">Module error</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#types">Type Aliases</a></li></ul></section><h2><a href="../index.html">In crate winnow</a></h2></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="../../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>Module <a href="../index.html">winnow</a>::<wbr><a class="mod" href="#">error</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/error.rs.html#1-1410">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"><h2 id="error-management"><a class="doc-anchor" href="#error-management">§</a>Error management</h2>
<p>Errors are designed with multiple needs in mind:</p>
<ul>
<li>Accumulate more <a href="../trait.Parser.html#method.context" title="method winnow::Parser::context">context</a> as the error goes up the parser chain</li>
<li>Distinguish between <a href="enum.ErrMode.html" title="enum winnow::error::ErrMode">recoverable errors,
unrecoverable errors, and more data is needed</a></li>
<li>Have a very low overhead, as errors are often discarded by the calling parser (examples: <code>repeat</code>, <code>alt</code>)</li>
<li>Can be modified according to the user’s needs, because some languages need a lot more information</li>
<li>Help thread-through the <a href="../stream/index.html" title="mod winnow::stream">stream</a></li>
</ul>
<p>To abstract these needs away from the user, generally <code>winnow</code> parsers use the <a href="type.PResult.html" title="type winnow::error::PResult"><code>PResult</code></a>
alias, rather than <a href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result"><code>Result</code></a>. <a href="../trait.Parser.html#method.parse" title="method winnow::Parser::parse"><code>Parser::parse</code></a> is a top-level operation
that can help convert to a <code>Result</code> for integrating with your application’s error reporting.</p>
<p>Error types include:</p>
<ul>
<li><code>()</code></li>
<li><a href="enum.ErrorKind.html" title="enum winnow::error::ErrorKind"><code>ErrorKind</code></a></li>
<li><a href="struct.InputError.html" title="struct winnow::error::InputError"><code>InputError</code></a> (mostly for testing)</li>
<li><a href="struct.ContextError.html" title="struct winnow::error::ContextError"><code>ContextError</code></a></li>
<li><a href="enum.TreeError.html" title="enum winnow::error::TreeError"><code>TreeError</code></a> (mostly for testing)</li>
<li>[Custom errors][crate::_topic::error]</li>
</ul>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.ContextError.html" title="struct winnow::error::ContextError">ContextError</a></div><div class="desc docblock-short">Accumulate context while backtracking errors</div></li><li><div class="item-name"><a class="struct" href="struct.InputError.html" title="struct winnow::error::InputError">InputError</a></div><div class="desc docblock-short">Capture input on error</div></li><li><div class="item-name"><a class="struct" href="struct.ParseError.html" title="struct winnow::error::ParseError">ParseError</a></div><div class="desc docblock-short">See <a href="../trait.Parser.html#method.parse" title="method winnow::Parser::parse"><code>Parser::parse</code></a></div></li><li><div class="item-name"><a class="struct" href="struct.TreeErrorBase.html" title="struct winnow::error::TreeErrorBase">TreeErrorBase</a></div><div class="desc docblock-short">See <a href="enum.TreeErrorFrame.html#variant.Kind" title="variant winnow::error::TreeErrorFrame::Kind"><code>TreeErrorFrame::Kind</code></a>, <a href="trait.ParserError.html#tymethod.append" title="method winnow::error::ParserError::append"><code>ParserError::append</code></a></div></li><li><div class="item-name"><a class="struct" href="struct.TreeErrorContext.html" title="struct winnow::error::TreeErrorContext">TreeErrorContext</a></div><div class="desc docblock-short">See <a href="enum.TreeErrorFrame.html#variant.Context" title="variant winnow::error::TreeErrorFrame::Context"><code>TreeErrorFrame::Context</code></a>, <a href="trait.AddContext.html#method.add_context" title="method winnow::error::AddContext::add_context"><code>AddContext::add_context</code></a></div></li></ul><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.ErrMode.html" title="enum winnow::error::ErrMode">ErrMode</a></div><div class="desc docblock-short">Add parse error state to <a href="trait.ParserError.html" title="trait winnow::error::ParserError"><code>ParserError</code></a>s</div></li><li><div class="item-name"><a class="enum" href="enum.ErrorKind.html" title="enum winnow::error::ErrorKind">ErrorKind</a></div><div class="desc docblock-short">Provide some minor debug context for errors</div></li><li><div class="item-name"><a class="enum" href="enum.Needed.html" title="enum winnow::error::Needed">Needed</a></div><div class="desc docblock-short">Contains information on needed data if a parser returned <code>Incomplete</code></div></li><li><div class="item-name"><a class="enum" href="enum.StrContext.html" title="enum winnow::error::StrContext">StrContext</a></div><div class="desc docblock-short">Additional parse context for <a href="struct.ContextError.html" title="struct winnow::error::ContextError"><code>ContextError</code></a> added via <a href="../trait.Parser.html#method.context" title="method winnow::Parser::context"><code>Parser::context</code></a></div></li><li><div class="item-name"><a class="enum" href="enum.StrContextValue.html" title="enum winnow::error::StrContextValue">StrContextValue</a></div><div class="desc docblock-short">See <a href="enum.StrContext.html" title="enum winnow::error::StrContext"><code>StrContext</code></a></div></li><li><div class="item-name"><a class="enum" href="enum.TreeError.html" title="enum winnow::error::TreeError">TreeError</a></div><div class="desc docblock-short">Trace all error paths, particularly for tests</div></li><li><div class="item-name"><a class="enum" href="enum.TreeErrorFrame.html" title="enum winnow::error::TreeErrorFrame">TreeErrorFrame</a></div><div class="desc docblock-short">See <a href="enum.TreeError.html#variant.Stack" title="variant winnow::error::TreeError::Stack"><code>TreeError::Stack</code></a></div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.AddContext.html" title="trait winnow::error::AddContext">AddContext</a></div><div class="desc docblock-short">Used by <a href="../trait.Parser.html#method.context" title="method winnow::Parser::context"><code>Parser::context</code></a> to add custom data to error while backtracking</div></li><li><div class="item-name"><a class="trait" href="trait.ErrorConvert.html" title="trait winnow::error::ErrorConvert">ErrorConvert</a></div><div class="desc docblock-short">Equivalent of <code>From</code> implementation to avoid orphan rules in bits parsers</div></li><li><div class="item-name"><a class="trait" href="trait.FromExternalError.html" title="trait winnow::error::FromExternalError">FromExternalError</a></div><div class="desc docblock-short">Create a new error with an external error, from <a href="https://doc.rust-lang.org/1.78.0/core/str/traits/trait.FromStr.html" title="trait core::str::traits::FromStr"><code>std::str::FromStr</code></a></div></li><li><div class="item-name"><a class="trait" href="trait.ParserError.html" title="trait winnow::error::ParserError">ParserError</a></div><div class="desc docblock-short">The basic <a href="../trait.Parser.html" title="trait winnow::Parser"><code>Parser</code></a> trait for errors</div></li></ul><h2 id="types" class="section-header">Type Aliases<a href="#types" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="type" href="type.IResult.html" title="type winnow::error::IResult">IResult</a></div><div class="desc docblock-short">For use with <a href="../trait.Parser.html#method.parse_peek" title="method winnow::Parser::parse_peek"><code>Parser::parse_peek</code></a> which allows the input stream to be threaded through a
parser.</div></li><li><div class="item-name"><a class="type" href="type.PResult.html" title="type winnow::error::PResult">PResult</a></div><div class="desc docblock-short">For use with <a href="../trait.Parser.html#tymethod.parse_next" title="method winnow::Parser::parse_next"><code>Parser::parse_next</code></a></div></li></ul></section></div></main></body></html>
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