| <!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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-1.8.3/src/error.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>error.rs - source</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 href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../regex/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../regex/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><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"><a href="../../help.html">?</a></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><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::iter::repeat; |
| |
| <span class="doccomment">/// An error that occurred during parsing or compiling a regular expression. |
| </span><span class="attribute">#[derive(Clone, PartialEq)] |
| </span><span class="kw">pub enum </span>Error { |
| <span class="doccomment">/// A syntax error. |
| </span>Syntax(String), |
| <span class="doccomment">/// The compiled program exceeded the set size |
| /// limit. The argument is the size limit imposed by |
| /// [`RegexBuilder::size_limit`](crate::RegexBuilder::size_limit). Even |
| /// when not configured explicitly, it defaults to a reasonable limit. |
| /// |
| /// If you're getting this error, it occurred because your regex has been |
| /// compiled to an intermediate state that is too big. It is important to |
| /// note that exceeding this limit does _not_ mean the regex is too big to |
| /// _work_, but rather, the regex is big enough that it may wind up being |
| /// surprisingly slow when used in a search. In other words, this error is |
| /// meant to be a practical heuristic for avoiding a performance footgun, |
| /// and especially so for the case where the regex pattern is coming from |
| /// an untrusted source. |
| /// |
| /// There are generally two ways to move forward if you hit this error. |
| /// The first is to find some way to use a smaller regex. The second is to |
| /// increase the size limit via `RegexBuilder::size_limit`. However, if |
| /// your regex pattern is not from a trusted source, then neither of these |
| /// approaches may be appropriate. Instead, you'll have to determine just |
| /// how big of a regex you want to allow. |
| </span>CompiledTooBig(usize), |
| <span class="doccomment">/// Hints that destructuring should not be exhaustive. |
| /// |
| /// This enum may grow additional variants, so this makes sure clients |
| /// don't count on exhaustive matching. (Otherwise, adding a new variant |
| /// could break existing code.) |
| </span><span class="attribute">#[doc(hidden)] |
| </span>__Nonexhaustive, |
| } |
| |
| <span class="kw">impl </span>::std::error::Error <span class="kw">for </span>Error { |
| <span class="comment">// TODO: Remove this method entirely on the next breaking semver release. |
| </span><span class="attribute">#[allow(deprecated)] |
| </span><span class="kw">fn </span>description(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Error::Syntax(<span class="kw-2">ref </span>err) => err, |
| Error::CompiledTooBig(<span class="kw">_</span>) => <span class="string">"compiled program too big"</span>, |
| Error::__Nonexhaustive => <span class="macro">unreachable!</span>(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Error { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Error::Syntax(<span class="kw-2">ref </span>err) => err.fmt(f), |
| Error::CompiledTooBig(limit) => <span class="macro">write!</span>( |
| f, |
| <span class="string">"Compiled regex exceeds size limit of {} bytes."</span>, |
| limit |
| ), |
| Error::__Nonexhaustive => <span class="macro">unreachable!</span>(), |
| } |
| } |
| } |
| |
| <span class="comment">// We implement our own Debug implementation so that we show nicer syntax |
| // errors when people use `Regex::new(...).unwrap()`. It's a little weird, |
| // but the `Syntax` variant is already storing a `String` anyway, so we might |
| // as well format it nicely. |
| </span><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Error { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Error::Syntax(<span class="kw-2">ref </span>err) => { |
| <span class="kw">let </span>hr: String = repeat(<span class="string">'~'</span>).take(<span class="number">79</span>).collect(); |
| <span class="macro">writeln!</span>(f, <span class="string">"Syntax("</span>)<span class="question-mark">?</span>; |
| <span class="macro">writeln!</span>(f, <span class="string">"{}"</span>, hr)<span class="question-mark">?</span>; |
| <span class="macro">writeln!</span>(f, <span class="string">"{}"</span>, err)<span class="question-mark">?</span>; |
| <span class="macro">writeln!</span>(f, <span class="string">"{}"</span>, hr)<span class="question-mark">?</span>; |
| <span class="macro">write!</span>(f, <span class="string">")"</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| Error::CompiledTooBig(limit) => { |
| f.debug_tuple(<span class="string">"CompiledTooBig"</span>).field(<span class="kw-2">&</span>limit).finish() |
| } |
| Error::__Nonexhaustive => { |
| f.debug_tuple(<span class="string">"__Nonexhaustive"</span>).finish() |
| } |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="regex" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
