| <!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/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" 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> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| <span id="402">402</span> |
| <span id="403">403</span> |
| <span id="404">404</span> |
| <span id="405">405</span> |
| <span id="406">406</span> |
| <span id="407">407</span> |
| <span id="408">408</span> |
| <span id="409">409</span> |
| <span id="410">410</span> |
| <span id="411">411</span> |
| <span id="412">412</span> |
| <span id="413">413</span> |
| <span id="414">414</span> |
| <span id="415">415</span> |
| <span id="416">416</span> |
| <span id="417">417</span> |
| <span id="418">418</span> |
| <span id="419">419</span> |
| <span id="420">420</span> |
| <span id="421">421</span> |
| </pre><pre class="rust"><code><span class="doccomment">/// The set of user configurable options for compiling zero or more regexes. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| #[allow(missing_docs)] |
| </span><span class="kw">pub struct </span>RegexOptions { |
| <span class="kw">pub </span>pats: Vec<String>, |
| <span class="kw">pub </span>size_limit: usize, |
| <span class="kw">pub </span>dfa_size_limit: usize, |
| <span class="kw">pub </span>nest_limit: u32, |
| <span class="kw">pub </span>case_insensitive: bool, |
| <span class="kw">pub </span>multi_line: bool, |
| <span class="kw">pub </span>dot_matches_new_line: bool, |
| <span class="kw">pub </span>swap_greed: bool, |
| <span class="kw">pub </span>ignore_whitespace: bool, |
| <span class="kw">pub </span>unicode: bool, |
| <span class="kw">pub </span>octal: bool, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>RegexOptions { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| RegexOptions { |
| pats: <span class="macro">vec!</span>[], |
| size_limit: <span class="number">10 </span>* (<span class="number">1 </span><< <span class="number">20</span>), |
| dfa_size_limit: <span class="number">2 </span>* (<span class="number">1 </span><< <span class="number">20</span>), |
| nest_limit: <span class="number">250</span>, |
| case_insensitive: <span class="bool-val">false</span>, |
| multi_line: <span class="bool-val">false</span>, |
| dot_matches_new_line: <span class="bool-val">false</span>, |
| swap_greed: <span class="bool-val">false</span>, |
| ignore_whitespace: <span class="bool-val">false</span>, |
| unicode: <span class="bool-val">true</span>, |
| octal: <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>define_builder { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$regex_mod</span>:ident, <span class="macro-nonterminal">$only_utf8</span>:expr) => { |
| <span class="kw">pub mod </span><span class="macro-nonterminal">$name </span>{ |
| <span class="kw">use </span><span class="kw">super</span>::RegexOptions; |
| <span class="kw">use </span><span class="kw">crate</span>::error::Error; |
| <span class="kw">use </span><span class="kw">crate</span>::exec::ExecBuilder; |
| |
| <span class="kw">use crate</span>::<span class="macro-nonterminal">$regex_mod::Regex</span>; |
| |
| <span class="doccomment">/// A configurable builder for a regular expression. |
| /// |
| /// A builder can be used to configure how the regex is built, for example, by |
| /// setting the default flags (which can be overridden in the expression |
| /// itself) or setting various limits. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>RegexBuilder(RegexOptions); |
| |
| <span class="kw">impl </span>RegexBuilder { |
| <span class="doccomment">/// Create a new regular expression builder with the given pattern. |
| /// |
| /// If the pattern is invalid, then an error will be returned when |
| /// `build` is called. |
| </span><span class="kw">pub fn </span>new(pattern: <span class="kw-2">&</span>str) -> RegexBuilder { |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = RegexBuilder(RegexOptions::default()); |
| builder.<span class="number">0</span>.pats.push(pattern.to_owned()); |
| builder |
| } |
| |
| <span class="doccomment">/// Consume the builder and compile the regular expression. |
| /// |
| /// Note that calling `as_str` on the resulting `Regex` will produce the |
| /// pattern given to `new` verbatim. Notably, it will not incorporate any |
| /// of the flags set on this builder. |
| </span><span class="kw">pub fn </span>build(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Regex, Error> { |
| ExecBuilder::new_options(<span class="self">self</span>.<span class="number">0</span>.clone()) |
| .only_utf8(<span class="macro-nonterminal">$only_utf8</span>) |
| .build() |
| .map(Regex::from) |
| } |
| |
| <span class="doccomment">/// Set the value for the case insensitive (`i`) flag. |
| /// |
| /// When enabled, letters in the pattern will match both upper case and |
| /// lower case variants. |
| </span><span class="kw">pub fn </span>case_insensitive( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.case_insensitive = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the multi-line matching (`m`) flag. |
| /// |
| /// When enabled, `^` matches the beginning of lines and `$` matches the |
| /// end of lines. |
| /// |
| /// By default, they match beginning/end of the input. |
| </span><span class="kw">pub fn </span>multi_line(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.multi_line = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the any character (`s`) flag, where in `.` matches |
| /// anything when `s` is set and matches anything except for new line when |
| /// it is not set (the default). |
| /// |
| /// N.B. "matches anything" means "any byte" when Unicode is disabled and |
| /// means "any valid UTF-8 encoding of any Unicode scalar value" when |
| /// Unicode is enabled. |
| </span><span class="kw">pub fn </span>dot_matches_new_line( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.dot_matches_new_line = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the greedy swap (`U`) flag. |
| /// |
| /// When enabled, a pattern like `a*` is lazy (tries to find shortest |
| /// match) and `a*?` is greedy (tries to find longest match). |
| /// |
| /// By default, `a*` is greedy and `a*?` is lazy. |
| </span><span class="kw">pub fn </span>swap_greed(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.swap_greed = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the ignore whitespace (`x`) flag. |
| /// |
| /// When enabled, whitespace such as new lines and spaces will be ignored |
| /// between expressions of the pattern, and `#` can be used to start a |
| /// comment until the next new line. |
| </span><span class="kw">pub fn </span>ignore_whitespace( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.ignore_whitespace = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the Unicode (`u`) flag. |
| /// |
| /// Enabled by default. When disabled, character classes such as `\w` only |
| /// match ASCII word characters instead of all Unicode word characters. |
| </span><span class="kw">pub fn </span>unicode(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.unicode = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Whether to support octal syntax or not. |
| /// |
| /// Octal syntax is a little-known way of uttering Unicode codepoints in |
| /// a regular expression. For example, `a`, `\x61`, `\u0061` and |
| /// `\141` are all equivalent regular expressions, where the last example |
| /// shows octal syntax. |
| /// |
| /// While supporting octal syntax isn't in and of itself a problem, it does |
| /// make good error messages harder. That is, in PCRE based regex engines, |
| /// syntax like `\0` invokes a backreference, which is explicitly |
| /// unsupported in Rust's regex engine. However, many users expect it to |
| /// be supported. Therefore, when octal support is disabled, the error |
| /// message will explicitly mention that backreferences aren't supported. |
| /// |
| /// Octal syntax is disabled by default. |
| </span><span class="kw">pub fn </span>octal(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.octal = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the approximate size limit of the compiled regular expression. |
| /// |
| /// This roughly corresponds to the number of bytes occupied by a single |
| /// compiled program. If the program exceeds this number, then a |
| /// compilation error is returned. |
| </span><span class="kw">pub fn </span>size_limit( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| limit: usize, |
| ) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.size_limit = limit; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the approximate size of the cache used by the DFA. |
| /// |
| /// This roughly corresponds to the number of bytes that the DFA will |
| /// use while searching. |
| /// |
| /// Note that this is a *per thread* limit. There is no way to set a global |
| /// limit. In particular, if a regex is used from multiple threads |
| /// simultaneously, then each thread may use up to the number of bytes |
| /// specified here. |
| </span><span class="kw">pub fn </span>dfa_size_limit( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| limit: usize, |
| ) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.dfa_size_limit = limit; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the nesting limit for this parser. |
| /// |
| /// The nesting limit controls how deep the abstract syntax tree is allowed |
| /// to be. If the AST exceeds the given limit (e.g., with too many nested |
| /// groups), then an error is returned by the parser. |
| /// |
| /// The purpose of this limit is to act as a heuristic to prevent stack |
| /// overflow for consumers that do structural induction on an `Ast` using |
| /// explicit recursion. While this crate never does this (instead using |
| /// constant stack space and moving the call stack to the heap), other |
| /// crates may. |
| /// |
| /// This limit is not checked until the entire Ast is parsed. Therefore, |
| /// if callers want to put a limit on the amount of heap space used, then |
| /// they should impose a limit on the length, in bytes, of the concrete |
| /// pattern string. In particular, this is viable since this parser |
| /// implementation will limit itself to heap space proportional to the |
| /// length of the pattern string. |
| /// |
| /// Note that a nest limit of `0` will return a nest limit error for most |
| /// patterns but not all. For example, a nest limit of `0` permits `a` but |
| /// not `ab`, since `ab` requires a concatenation, which results in a nest |
| /// depth of `1`. In general, a nest limit is not something that manifests |
| /// in an obvious way in the concrete syntax, therefore, it should not be |
| /// used in a granular way. |
| </span><span class="kw">pub fn </span>nest_limit(<span class="kw-2">&mut </span><span class="self">self</span>, limit: u32) -> <span class="kw-2">&mut </span>RegexBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.nest_limit = limit; |
| <span class="self">self |
| </span>} |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">define_builder!</span>(bytes, re_bytes, <span class="bool-val">false</span>); |
| <span class="macro">define_builder!</span>(unicode, re_unicode, <span class="bool-val">true</span>); |
| |
| <span class="macro">macro_rules! </span>define_set_builder { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$regex_mod</span>:ident, <span class="macro-nonterminal">$only_utf8</span>:expr) => { |
| <span class="kw">pub mod </span><span class="macro-nonterminal">$name </span>{ |
| <span class="kw">use </span><span class="kw">super</span>::RegexOptions; |
| <span class="kw">use </span><span class="kw">crate</span>::error::Error; |
| <span class="kw">use </span><span class="kw">crate</span>::exec::ExecBuilder; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::re_set::<span class="macro-nonterminal">$regex_mod::RegexSet</span>; |
| |
| <span class="doccomment">/// A configurable builder for a set of regular expressions. |
| /// |
| /// A builder can be used to configure how the regexes are built, for example, |
| /// by setting the default flags (which can be overridden in the expression |
| /// itself) or setting various limits. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>RegexSetBuilder(RegexOptions); |
| |
| <span class="kw">impl </span>RegexSetBuilder { |
| <span class="doccomment">/// Create a new regular expression builder with the given pattern. |
| /// |
| /// If the pattern is invalid, then an error will be returned when |
| /// `build` is called. |
| </span><span class="kw">pub fn </span>new<I, S>(patterns: I) -> RegexSetBuilder |
| <span class="kw">where |
| </span>S: AsRef<str>, |
| I: IntoIterator<Item = S>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = RegexSetBuilder(RegexOptions::default()); |
| <span class="kw">for </span>pat <span class="kw">in </span>patterns { |
| builder.<span class="number">0</span>.pats.push(pat.as_ref().to_owned()); |
| } |
| builder |
| } |
| |
| <span class="doccomment">/// Consume the builder and compile the regular expressions into a set. |
| </span><span class="kw">pub fn </span>build(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><RegexSet, Error> { |
| ExecBuilder::new_options(<span class="self">self</span>.<span class="number">0</span>.clone()) |
| .only_utf8(<span class="macro-nonterminal">$only_utf8</span>) |
| .build() |
| .map(RegexSet::from) |
| } |
| |
| <span class="doccomment">/// Set the value for the case insensitive (`i`) flag. |
| </span><span class="kw">pub fn </span>case_insensitive( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.case_insensitive = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the multi-line matching (`m`) flag. |
| </span><span class="kw">pub fn </span>multi_line( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.multi_line = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the any character (`s`) flag, where in `.` matches |
| /// anything when `s` is set and matches anything except for new line when |
| /// it is not set (the default). |
| /// |
| /// N.B. "matches anything" means "any byte" for `regex::bytes::RegexSet` |
| /// expressions and means "any Unicode scalar value" for `regex::RegexSet` |
| /// expressions. |
| </span><span class="kw">pub fn </span>dot_matches_new_line( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.dot_matches_new_line = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the greedy swap (`U`) flag. |
| </span><span class="kw">pub fn </span>swap_greed( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.swap_greed = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the ignore whitespace (`x`) flag. |
| </span><span class="kw">pub fn </span>ignore_whitespace( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| yes: bool, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.ignore_whitespace = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the value for the Unicode (`u`) flag. |
| </span><span class="kw">pub fn </span>unicode(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.unicode = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Whether to support octal syntax or not. |
| /// |
| /// Octal syntax is a little-known way of uttering Unicode codepoints in |
| /// a regular expression. For example, `a`, `\x61`, `\u0061` and |
| /// `\141` are all equivalent regular expressions, where the last example |
| /// shows octal syntax. |
| /// |
| /// While supporting octal syntax isn't in and of itself a problem, it does |
| /// make good error messages harder. That is, in PCRE based regex engines, |
| /// syntax like `\0` invokes a backreference, which is explicitly |
| /// unsupported in Rust's regex engine. However, many users expect it to |
| /// be supported. Therefore, when octal support is disabled, the error |
| /// message will explicitly mention that backreferences aren't supported. |
| /// |
| /// Octal syntax is disabled by default. |
| </span><span class="kw">pub fn </span>octal(<span class="kw-2">&mut </span><span class="self">self</span>, yes: bool) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.octal = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the approximate size limit of the compiled regular expression. |
| /// |
| /// This roughly corresponds to the number of bytes occupied by a single |
| /// compiled program. If the program exceeds this number, then a |
| /// compilation error is returned. |
| </span><span class="kw">pub fn </span>size_limit( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| limit: usize, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.size_limit = limit; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the approximate size of the cache used by the DFA. |
| /// |
| /// This roughly corresponds to the number of bytes that the DFA will |
| /// use while searching. |
| /// |
| /// Note that this is a *per thread* limit. There is no way to set a global |
| /// limit. In particular, if a regex is used from multiple threads |
| /// simultaneously, then each thread may use up to the number of bytes |
| /// specified here. |
| </span><span class="kw">pub fn </span>dfa_size_limit( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| limit: usize, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.dfa_size_limit = limit; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Set the nesting limit for this parser. |
| /// |
| /// The nesting limit controls how deep the abstract syntax tree is allowed |
| /// to be. If the AST exceeds the given limit (e.g., with too many nested |
| /// groups), then an error is returned by the parser. |
| /// |
| /// The purpose of this limit is to act as a heuristic to prevent stack |
| /// overflow for consumers that do structural induction on an `Ast` using |
| /// explicit recursion. While this crate never does this (instead using |
| /// constant stack space and moving the call stack to the heap), other |
| /// crates may. |
| /// |
| /// This limit is not checked until the entire Ast is parsed. Therefore, |
| /// if callers want to put a limit on the amount of heap space used, then |
| /// they should impose a limit on the length, in bytes, of the concrete |
| /// pattern string. In particular, this is viable since this parser |
| /// implementation will limit itself to heap space proportional to the |
| /// length of the pattern string. |
| /// |
| /// Note that a nest limit of `0` will return a nest limit error for most |
| /// patterns but not all. For example, a nest limit of `0` permits `a` but |
| /// not `ab`, since `ab` requires a concatenation, which results in a nest |
| /// depth of `1`. In general, a nest limit is not something that manifests |
| /// in an obvious way in the concrete syntax, therefore, it should not be |
| /// used in a granular way. |
| </span><span class="kw">pub fn </span>nest_limit( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| limit: u32, |
| ) -> <span class="kw-2">&mut </span>RegexSetBuilder { |
| <span class="self">self</span>.<span class="number">0</span>.nest_limit = limit; |
| <span class="self">self |
| </span>} |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">define_set_builder!</span>(set_bytes, bytes, <span class="bool-val">false</span>); |
| <span class="macro">define_set_builder!</span>(set_unicode, unicode, <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="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |