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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="Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-1.5.6/src/re_builder.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>re_builder.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" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" 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="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../regex/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
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</pre><pre class="rust"><code><span class="doccomment">/// The set of user configurable options for compiling zero or more regexes.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RegexOptions</span> {
<span class="kw">pub</span> <span class="ident">pats</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
<span class="kw">pub</span> <span class="ident">size_limit</span>: <span class="ident">usize</span>,
<span class="kw">pub</span> <span class="ident">dfa_size_limit</span>: <span class="ident">usize</span>,
<span class="kw">pub</span> <span class="ident">nest_limit</span>: <span class="ident">u32</span>,
<span class="kw">pub</span> <span class="ident">case_insensitive</span>: <span class="ident">bool</span>,
<span class="kw">pub</span> <span class="ident">multi_line</span>: <span class="ident">bool</span>,
<span class="kw">pub</span> <span class="ident">dot_matches_new_line</span>: <span class="ident">bool</span>,
<span class="kw">pub</span> <span class="ident">swap_greed</span>: <span class="ident">bool</span>,
<span class="kw">pub</span> <span class="ident">ignore_whitespace</span>: <span class="ident">bool</span>,
<span class="kw">pub</span> <span class="ident">unicode</span>: <span class="ident">bool</span>,
<span class="kw">pub</span> <span class="ident">octal</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">RegexOptions</span> {
<span class="kw">fn</span> <span class="ident">default</span>() -> <span class="self">Self</span> {
<span class="ident">RegexOptions</span> {
<span class="ident">pats</span>: <span class="macro">vec!</span>[],
<span class="ident">size_limit</span>: <span class="number">10</span> <span class="op">*</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">20</span>),
<span class="ident">dfa_size_limit</span>: <span class="number">2</span> <span class="op">*</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">20</span>),
<span class="ident">nest_limit</span>: <span class="number">250</span>,
<span class="ident">case_insensitive</span>: <span class="bool-val">false</span>,
<span class="ident">multi_line</span>: <span class="bool-val">false</span>,
<span class="ident">dot_matches_new_line</span>: <span class="bool-val">false</span>,
<span class="ident">swap_greed</span>: <span class="bool-val">false</span>,
<span class="ident">ignore_whitespace</span>: <span class="bool-val">false</span>,
<span class="ident">unicode</span>: <span class="bool-val">true</span>,
<span class="ident">octal</span>: <span class="bool-val">false</span>,
}
}
}
<span class="macro">macro_rules!</span> <span class="ident">define_builder</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">regex_mod</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">only_utf8</span>:<span class="ident">expr</span>) => {
<span class="kw">pub</span> <span class="kw">mod</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
<span class="kw">use</span> <span class="ident"><span class="kw">super</span>::RegexOptions</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error::Error</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::exec::ExecBuilder</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">regex_mod::Regex</span>;
<span class="doccomment">/// A configurable builder for a regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A builder can be used to configure how the regex is built, for example, by</span>
<span class="doccomment">/// setting the default flags (which can be overridden in the expression</span>
<span class="doccomment">/// itself) or setting various limits.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RegexBuilder</span>(<span class="ident">RegexOptions</span>);
<span class="kw">impl</span> <span class="ident">RegexBuilder</span> {
<span class="doccomment">/// Create a new regular expression builder with the given pattern.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the pattern is invalid, then an error will be returned when</span>
<span class="doccomment">/// `build` is called.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">pattern</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="ident">RegexBuilder</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">RegexBuilder</span>(<span class="ident">RegexOptions::default</span>());
<span class="ident">builder</span>.<span class="number">0</span>.<span class="ident">pats</span>.<span class="ident">push</span>(<span class="ident">pattern</span>.<span class="ident">to_owned</span>());
<span class="ident">builder</span>
}
<span class="doccomment">/// Consume the builder and compile the regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that calling `as_str` on the resulting `Regex` will produce the</span>
<span class="doccomment">/// pattern given to `new` verbatim. Notably, it will not incorporate any</span>
<span class="doccomment">/// of the flags set on this builder.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Regex</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="ident">ExecBuilder::new_options</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">clone</span>())
.<span class="ident">only_utf8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">only_utf8</span>)
.<span class="ident">build</span>()
.<span class="ident">map</span>(<span class="ident">Regex::from</span>)
}
<span class="doccomment">/// Set the value for the case insensitive (`i`) flag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When enabled, letters in the pattern will match both upper case and</span>
<span class="doccomment">/// lower case variants.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">case_insensitive</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">case_insensitive</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the multi-line matching (`m`) flag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When enabled, `^` matches the beginning of lines and `$` matches the</span>
<span class="doccomment">/// end of lines.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// By default, they match beginning/end of the input.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">multi_line</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">multi_line</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the any character (`s`) flag, where in `.` matches</span>
<span class="doccomment">/// anything when `s` is set and matches anything except for new line when</span>
<span class="doccomment">/// it is not set (the default).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// N.B. "matches anything" means "any byte" when Unicode is disabled and</span>
<span class="doccomment">/// means "any valid UTF-8 encoding of any Unicode scalar value" when</span>
<span class="doccomment">/// Unicode is enabled.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dot_matches_new_line</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">dot_matches_new_line</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the greedy swap (`U`) flag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When enabled, a pattern like `a*` is lazy (tries to find shortest</span>
<span class="doccomment">/// match) and `a*?` is greedy (tries to find longest match).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// By default, `a*` is greedy and `a*?` is lazy.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap_greed</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">swap_greed</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the ignore whitespace (`x`) flag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When enabled, whitespace such as new lines and spaces will be ignored</span>
<span class="doccomment">/// between expressions of the pattern, and `#` can be used to start a</span>
<span class="doccomment">/// comment until the next new line.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ignore_whitespace</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">ignore_whitespace</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the Unicode (`u`) flag.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enabled by default. When disabled, character classes such as `\w` only</span>
<span class="doccomment">/// match ASCII word characters instead of all Unicode word characters.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unicode</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">unicode</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Whether to support octal syntax or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Octal syntax is a little-known way of uttering Unicode codepoints in</span>
<span class="doccomment">/// a regular expression. For example, `a`, `\x61`, `\u0061` and</span>
<span class="doccomment">/// `\141` are all equivalent regular expressions, where the last example</span>
<span class="doccomment">/// shows octal syntax.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// While supporting octal syntax isn't in and of itself a problem, it does</span>
<span class="doccomment">/// make good error messages harder. That is, in PCRE based regex engines,</span>
<span class="doccomment">/// syntax like `\0` invokes a backreference, which is explicitly</span>
<span class="doccomment">/// unsupported in Rust's regex engine. However, many users expect it to</span>
<span class="doccomment">/// be supported. Therefore, when octal support is disabled, the error</span>
<span class="doccomment">/// message will explicitly mention that backreferences aren't supported.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Octal syntax is disabled by default.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">octal</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">octal</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the approximate size limit of the compiled regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This roughly corresponds to the number of bytes occupied by a single</span>
<span class="doccomment">/// compiled program. If the program exceeds this number, then a</span>
<span class="doccomment">/// compilation error is returned.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">size_limit</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">limit</span>: <span class="ident">usize</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">size_limit</span> <span class="op">=</span> <span class="ident">limit</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the approximate size of the cache used by the DFA.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This roughly corresponds to the number of bytes that the DFA will</span>
<span class="doccomment">/// use while searching.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this is a *per thread* limit. There is no way to set a global</span>
<span class="doccomment">/// limit. In particular, if a regex is used from multiple threads</span>
<span class="doccomment">/// simultaneously, then each thread may use up to the number of bytes</span>
<span class="doccomment">/// specified here.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dfa_size_limit</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">limit</span>: <span class="ident">usize</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">dfa_size_limit</span> <span class="op">=</span> <span class="ident">limit</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the nesting limit for this parser.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The nesting limit controls how deep the abstract syntax tree is allowed</span>
<span class="doccomment">/// to be. If the AST exceeds the given limit (e.g., with too many nested</span>
<span class="doccomment">/// groups), then an error is returned by the parser.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The purpose of this limit is to act as a heuristic to prevent stack</span>
<span class="doccomment">/// overflow for consumers that do structural induction on an `Ast` using</span>
<span class="doccomment">/// explicit recursion. While this crate never does this (instead using</span>
<span class="doccomment">/// constant stack space and moving the call stack to the heap), other</span>
<span class="doccomment">/// crates may.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This limit is not checked until the entire Ast is parsed. Therefore,</span>
<span class="doccomment">/// if callers want to put a limit on the amount of heap space used, then</span>
<span class="doccomment">/// they should impose a limit on the length, in bytes, of the concrete</span>
<span class="doccomment">/// pattern string. In particular, this is viable since this parser</span>
<span class="doccomment">/// implementation will limit itself to heap space proportional to the</span>
<span class="doccomment">/// length of the pattern string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that a nest limit of `0` will return a nest limit error for most</span>
<span class="doccomment">/// patterns but not all. For example, a nest limit of `0` permits `a` but</span>
<span class="doccomment">/// not `ab`, since `ab` requires a concatenation, which results in a nest</span>
<span class="doccomment">/// depth of `1`. In general, a nest limit is not something that manifests</span>
<span class="doccomment">/// in an obvious way in the concrete syntax, therefore, it should not be</span>
<span class="doccomment">/// used in a granular way.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nest_limit</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">limit</span>: <span class="ident">u32</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">nest_limit</span> <span class="op">=</span> <span class="ident">limit</span>;
<span class="self">self</span>
}
}
}
};
}
<span class="macro">define_builder!</span>(<span class="ident">bytes</span>, <span class="ident">re_bytes</span>, <span class="bool-val">false</span>);
<span class="macro">define_builder!</span>(<span class="ident">unicode</span>, <span class="ident">re_unicode</span>, <span class="bool-val">true</span>);
<span class="macro">macro_rules!</span> <span class="ident">define_set_builder</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">regex_mod</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">only_utf8</span>:<span class="ident">expr</span>) => {
<span class="kw">pub</span> <span class="kw">mod</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
<span class="kw">use</span> <span class="ident"><span class="kw">super</span>::RegexOptions</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error::Error</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::exec::ExecBuilder</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::re_set</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">regex_mod::RegexSet</span>;
<span class="doccomment">/// A configurable builder for a set of regular expressions.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A builder can be used to configure how the regexes are built, for example,</span>
<span class="doccomment">/// by setting the default flags (which can be overridden in the expression</span>
<span class="doccomment">/// itself) or setting various limits.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RegexSetBuilder</span>(<span class="ident">RegexOptions</span>);
<span class="kw">impl</span> <span class="ident">RegexSetBuilder</span> {
<span class="doccomment">/// Create a new regular expression builder with the given pattern.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the pattern is invalid, then an error will be returned when</span>
<span class="doccomment">/// `build` is called.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">S</span><span class="op">></span>(<span class="ident">patterns</span>: <span class="ident">I</span>) -> <span class="ident">RegexSetBuilder</span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">str</span><span class="op">></span>,
<span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">S</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">RegexSetBuilder</span>(<span class="ident">RegexOptions::default</span>());
<span class="kw">for</span> <span class="ident">pat</span> <span class="kw">in</span> <span class="ident">patterns</span> {
<span class="ident">builder</span>.<span class="number">0</span>.<span class="ident">pats</span>.<span class="ident">push</span>(<span class="ident">pat</span>.<span class="ident">as_ref</span>().<span class="ident">to_owned</span>());
}
<span class="ident">builder</span>
}
<span class="doccomment">/// Consume the builder and compile the regular expressions into a set.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RegexSet</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="ident">ExecBuilder::new_options</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">clone</span>())
.<span class="ident">only_utf8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">only_utf8</span>)
.<span class="ident">build</span>()
.<span class="ident">map</span>(<span class="ident">RegexSet::from</span>)
}
<span class="doccomment">/// Set the value for the case insensitive (`i`) flag.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">case_insensitive</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">case_insensitive</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the multi-line matching (`m`) flag.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">multi_line</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">multi_line</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the any character (`s`) flag, where in `.` matches</span>
<span class="doccomment">/// anything when `s` is set and matches anything except for new line when</span>
<span class="doccomment">/// it is not set (the default).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// N.B. "matches anything" means "any byte" for `regex::bytes::RegexSet`</span>
<span class="doccomment">/// expressions and means "any Unicode scalar value" for `regex::RegexSet`</span>
<span class="doccomment">/// expressions.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dot_matches_new_line</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">dot_matches_new_line</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the greedy swap (`U`) flag.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap_greed</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">swap_greed</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the ignore whitespace (`x`) flag.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ignore_whitespace</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">yes</span>: <span class="ident">bool</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">ignore_whitespace</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the value for the Unicode (`u`) flag.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unicode</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">unicode</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Whether to support octal syntax or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Octal syntax is a little-known way of uttering Unicode codepoints in</span>
<span class="doccomment">/// a regular expression. For example, `a`, `\x61`, `\u0061` and</span>
<span class="doccomment">/// `\141` are all equivalent regular expressions, where the last example</span>
<span class="doccomment">/// shows octal syntax.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// While supporting octal syntax isn't in and of itself a problem, it does</span>
<span class="doccomment">/// make good error messages harder. That is, in PCRE based regex engines,</span>
<span class="doccomment">/// syntax like `\0` invokes a backreference, which is explicitly</span>
<span class="doccomment">/// unsupported in Rust's regex engine. However, many users expect it to</span>
<span class="doccomment">/// be supported. Therefore, when octal support is disabled, the error</span>
<span class="doccomment">/// message will explicitly mention that backreferences aren't supported.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Octal syntax is disabled by default.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">octal</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">octal</span> <span class="op">=</span> <span class="ident">yes</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the approximate size limit of the compiled regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This roughly corresponds to the number of bytes occupied by a single</span>
<span class="doccomment">/// compiled program. If the program exceeds this number, then a</span>
<span class="doccomment">/// compilation error is returned.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">size_limit</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">limit</span>: <span class="ident">usize</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">size_limit</span> <span class="op">=</span> <span class="ident">limit</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the approximate size of the cache used by the DFA.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This roughly corresponds to the number of bytes that the DFA will</span>
<span class="doccomment">/// use while searching.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this is a *per thread* limit. There is no way to set a global</span>
<span class="doccomment">/// limit. In particular, if a regex is used from multiple threads</span>
<span class="doccomment">/// simultaneously, then each thread may use up to the number of bytes</span>
<span class="doccomment">/// specified here.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dfa_size_limit</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">limit</span>: <span class="ident">usize</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">dfa_size_limit</span> <span class="op">=</span> <span class="ident">limit</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set the nesting limit for this parser.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The nesting limit controls how deep the abstract syntax tree is allowed</span>
<span class="doccomment">/// to be. If the AST exceeds the given limit (e.g., with too many nested</span>
<span class="doccomment">/// groups), then an error is returned by the parser.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The purpose of this limit is to act as a heuristic to prevent stack</span>
<span class="doccomment">/// overflow for consumers that do structural induction on an `Ast` using</span>
<span class="doccomment">/// explicit recursion. While this crate never does this (instead using</span>
<span class="doccomment">/// constant stack space and moving the call stack to the heap), other</span>
<span class="doccomment">/// crates may.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This limit is not checked until the entire Ast is parsed. Therefore,</span>
<span class="doccomment">/// if callers want to put a limit on the amount of heap space used, then</span>
<span class="doccomment">/// they should impose a limit on the length, in bytes, of the concrete</span>
<span class="doccomment">/// pattern string. In particular, this is viable since this parser</span>
<span class="doccomment">/// implementation will limit itself to heap space proportional to the</span>
<span class="doccomment">/// length of the pattern string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that a nest limit of `0` will return a nest limit error for most</span>
<span class="doccomment">/// patterns but not all. For example, a nest limit of `0` permits `a` but</span>
<span class="doccomment">/// not `ab`, since `ab` requires a concatenation, which results in a nest</span>
<span class="doccomment">/// depth of `1`. In general, a nest limit is not something that manifests</span>
<span class="doccomment">/// in an obvious way in the concrete syntax, therefore, it should not be</span>
<span class="doccomment">/// used in a granular way.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nest_limit</span>(
<span class="kw-2">&mut</span> <span class="self">self</span>,
<span class="ident">limit</span>: <span class="ident">u32</span>,
) -> <span class="kw-2">&mut</span> <span class="ident">RegexSetBuilder</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">nest_limit</span> <span class="op">=</span> <span class="ident">limit</span>;
<span class="self">self</span>
}
}
}
};
}
<span class="macro">define_set_builder!</span>(<span class="ident">set_bytes</span>, <span class="ident">bytes</span>, <span class="bool-val">false</span>);
<span class="macro">define_set_builder!</span>(<span class="ident">set_unicode</span>, <span class="ident">unicode</span>, <span class="bool-val">true</span>);
</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="1.64.0-nightly (495b21669 2022-07-03)" ></div>
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