Google Git
Sign in
apache / incubator-teaclave-website / refs/heads/asf-site / . / api-docs / crates-app / src / regex / input.rs.html
blob: 3da0e44c1631862a2e76afd8f050b21df6b6d9c6 [file] [log] [blame]
<!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/input.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>input.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>
<span id="422">422</span>
<span id="423">423</span>
<span id="424">424</span>
<span id="425">425</span>
<span id="426">426</span>
<span id="427">427</span>
<span id="428">428</span>
<span id="429">429</span>
<span id="430">430</span>
<span id="431">431</span>
<span id="432">432</span>
</pre><pre class="rust"><code><span class="kw">use </span>std::char;
<span class="kw">use </span>std::cmp::Ordering;
<span class="kw">use </span>std::fmt;
<span class="kw">use </span>std::ops;
<span class="kw">use </span>std::u32;
<span class="kw">use </span><span class="kw">crate</span>::literal::LiteralSearcher;
<span class="kw">use </span><span class="kw">crate</span>::prog::InstEmptyLook;
<span class="kw">use </span><span class="kw">crate</span>::utf8::{decode_last_utf8, decode_utf8};
<span class="doccomment">/// Represents a location in the input.
</span><span class="attribute">#[derive(Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>InputAt {
pos: usize,
c: Char,
byte: <span class="prelude-ty">Option</span>&lt;u8&gt;,
len: usize,
}
<span class="kw">impl </span>InputAt {
<span class="doccomment">/// Returns true iff this position is at the beginning of the input.
</span><span class="kw">pub fn </span>is_start(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.pos == <span class="number">0
</span>}
<span class="doccomment">/// Returns true iff this position is past the end of the input.
</span><span class="kw">pub fn </span>is_end(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.c.is_none() &amp;&amp; <span class="self">self</span>.byte.is_none()
}
<span class="doccomment">/// Returns the character at this position.
///
/// If this position is just before or after the input, then an absent
/// character is returned.
</span><span class="kw">pub fn </span>char(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Char {
<span class="self">self</span>.c
}
<span class="doccomment">/// Returns the byte at this position.
</span><span class="kw">pub fn </span>byte(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
<span class="self">self</span>.byte
}
<span class="doccomment">/// Returns the UTF-8 width of the character at this position.
</span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.len
}
<span class="doccomment">/// Returns whether the UTF-8 width of the character at this position
/// is zero.
</span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.len == <span class="number">0
</span>}
<span class="doccomment">/// Returns the byte offset of this position.
</span><span class="kw">pub fn </span>pos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.pos
}
<span class="doccomment">/// Returns the byte offset of the next position in the input.
</span><span class="kw">pub fn </span>next_pos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.pos + <span class="self">self</span>.len
}
}
<span class="doccomment">/// An abstraction over input used in the matching engines.
</span><span class="kw">pub trait </span>Input: fmt::Debug {
<span class="doccomment">/// Return an encoding of the position at byte offset `i`.
</span><span class="kw">fn </span>at(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; InputAt;
<span class="doccomment">/// Return the Unicode character occurring next to `at`.
///
/// If no such character could be decoded, then `Char` is absent.
</span><span class="kw">fn </span>next_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char;
<span class="doccomment">/// Return the Unicode character occurring previous to `at`.
///
/// If no such character could be decoded, then `Char` is absent.
</span><span class="kw">fn </span>previous_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char;
<span class="doccomment">/// Return true if the given empty width instruction matches at the
/// input position given.
</span><span class="kw">fn </span>is_empty_match(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt, empty: <span class="kw-2">&amp;</span>InstEmptyLook) -&gt; bool;
<span class="doccomment">/// Scan the input for a matching prefix.
</span><span class="kw">fn </span>prefix_at(
<span class="kw-2">&amp;</span><span class="self">self</span>,
prefixes: <span class="kw-2">&amp;</span>LiteralSearcher,
at: InputAt,
) -&gt; <span class="prelude-ty">Option</span>&lt;InputAt&gt;;
<span class="doccomment">/// The number of bytes in the input.
</span><span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize;
<span class="doccomment">/// Whether the input is empty.
</span><span class="kw">fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.len() == <span class="number">0
</span>}
<span class="doccomment">/// Return the given input as a sequence of bytes.
</span><span class="kw">fn </span>as_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8];
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T: Input&gt; Input <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T {
<span class="kw">fn </span>at(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; InputAt {
(<span class="kw-2">**</span><span class="self">self</span>).at(i)
}
<span class="kw">fn </span>next_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char {
(<span class="kw-2">**</span><span class="self">self</span>).next_char(at)
}
<span class="kw">fn </span>previous_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char {
(<span class="kw-2">**</span><span class="self">self</span>).previous_char(at)
}
<span class="kw">fn </span>is_empty_match(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt, empty: <span class="kw-2">&amp;</span>InstEmptyLook) -&gt; bool {
(<span class="kw-2">**</span><span class="self">self</span>).is_empty_match(at, empty)
}
<span class="kw">fn </span>prefix_at(
<span class="kw-2">&amp;</span><span class="self">self</span>,
prefixes: <span class="kw-2">&amp;</span>LiteralSearcher,
at: InputAt,
) -&gt; <span class="prelude-ty">Option</span>&lt;InputAt&gt; {
(<span class="kw-2">**</span><span class="self">self</span>).prefix_at(prefixes, at)
}
<span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
(<span class="kw-2">**</span><span class="self">self</span>).len()
}
<span class="kw">fn </span>as_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
(<span class="kw-2">**</span><span class="self">self</span>).as_bytes()
}
}
<span class="doccomment">/// An input reader over characters.
</span><span class="attribute">#[derive(Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>CharInput&lt;<span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]);
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; CharInput&lt;<span class="lifetime">&#39;t</span>&gt; {
<span class="doccomment">/// Return a new character input reader for the given string.
</span><span class="kw">pub fn </span>new(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]) -&gt; CharInput&lt;<span class="lifetime">&#39;t</span>&gt; {
CharInput(s)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; ops::Deref <span class="kw">for </span>CharInput&lt;<span class="lifetime">&#39;t</span>&gt; {
<span class="kw">type </span>Target = [u8];
<span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
<span class="self">self</span>.<span class="number">0
</span>}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; Input <span class="kw">for </span>CharInput&lt;<span class="lifetime">&#39;t</span>&gt; {
<span class="kw">fn </span>at(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; InputAt {
<span class="kw">if </span>i &gt;= <span class="self">self</span>.len() {
InputAt { pos: <span class="self">self</span>.len(), c: <span class="prelude-val">None</span>.into(), byte: <span class="prelude-val">None</span>, len: <span class="number">0 </span>}
} <span class="kw">else </span>{
<span class="kw">let </span>c = decode_utf8(<span class="kw-2">&amp;</span><span class="self">self</span>[i..]).map(|(c, <span class="kw">_</span>)| c).into();
InputAt { pos: i, c, byte: <span class="prelude-val">None</span>, len: c.len_utf8() }
}
}
<span class="kw">fn </span>next_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char {
at.char()
}
<span class="kw">fn </span>previous_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char {
decode_last_utf8(<span class="kw-2">&amp;</span><span class="self">self</span>[..at.pos()]).map(|(c, <span class="kw">_</span>)| c).into()
}
<span class="kw">fn </span>is_empty_match(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt, empty: <span class="kw-2">&amp;</span>InstEmptyLook) -&gt; bool {
<span class="kw">use </span><span class="kw">crate</span>::prog::EmptyLook::<span class="kw-2">*</span>;
<span class="kw">match </span>empty.look {
StartLine =&gt; {
<span class="kw">let </span>c = <span class="self">self</span>.previous_char(at);
at.pos() == <span class="number">0 </span>|| c == <span class="string">&#39;\n&#39;
</span>}
EndLine =&gt; {
<span class="kw">let </span>c = <span class="self">self</span>.next_char(at);
at.pos() == <span class="self">self</span>.len() || c == <span class="string">&#39;\n&#39;
</span>}
StartText =&gt; at.pos() == <span class="number">0</span>,
EndText =&gt; at.pos() == <span class="self">self</span>.len(),
WordBoundary =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
c1.is_word_char() != c2.is_word_char()
}
NotWordBoundary =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
c1.is_word_char() == c2.is_word_char()
}
WordBoundaryAscii =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
c1.is_word_byte() != c2.is_word_byte()
}
NotWordBoundaryAscii =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
c1.is_word_byte() == c2.is_word_byte()
}
}
}
<span class="kw">fn </span>prefix_at(
<span class="kw-2">&amp;</span><span class="self">self</span>,
prefixes: <span class="kw-2">&amp;</span>LiteralSearcher,
at: InputAt,
) -&gt; <span class="prelude-ty">Option</span>&lt;InputAt&gt; {
prefixes.find(<span class="kw-2">&amp;</span><span class="self">self</span>[at.pos()..]).map(|(s, <span class="kw">_</span>)| <span class="self">self</span>.at(at.pos() + s))
}
<span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.<span class="number">0</span>.len()
}
<span class="kw">fn </span>as_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
<span class="self">self</span>.<span class="number">0
</span>}
}
<span class="doccomment">/// An input reader over bytes.
</span><span class="attribute">#[derive(Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>ByteInput&lt;<span class="lifetime">&#39;t</span>&gt; {
text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
only_utf8: bool,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; ByteInput&lt;<span class="lifetime">&#39;t</span>&gt; {
<span class="doccomment">/// Return a new byte-based input reader for the given string.
</span><span class="kw">pub fn </span>new(text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8], only_utf8: bool) -&gt; ByteInput&lt;<span class="lifetime">&#39;t</span>&gt; {
ByteInput { text, only_utf8 }
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; ops::Deref <span class="kw">for </span>ByteInput&lt;<span class="lifetime">&#39;t</span>&gt; {
<span class="kw">type </span>Target = [u8];
<span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
<span class="self">self</span>.text
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; Input <span class="kw">for </span>ByteInput&lt;<span class="lifetime">&#39;t</span>&gt; {
<span class="kw">fn </span>at(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; InputAt {
<span class="kw">if </span>i &gt;= <span class="self">self</span>.len() {
InputAt { pos: <span class="self">self</span>.len(), c: <span class="prelude-val">None</span>.into(), byte: <span class="prelude-val">None</span>, len: <span class="number">0 </span>}
} <span class="kw">else </span>{
InputAt {
pos: i,
c: <span class="prelude-val">None</span>.into(),
byte: <span class="self">self</span>.get(i).cloned(),
len: <span class="number">1</span>,
}
}
}
<span class="kw">fn </span>next_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char {
decode_utf8(<span class="kw-2">&amp;</span><span class="self">self</span>[at.pos()..]).map(|(c, <span class="kw">_</span>)| c).into()
}
<span class="kw">fn </span>previous_char(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt) -&gt; Char {
decode_last_utf8(<span class="kw-2">&amp;</span><span class="self">self</span>[..at.pos()]).map(|(c, <span class="kw">_</span>)| c).into()
}
<span class="kw">fn </span>is_empty_match(<span class="kw-2">&amp;</span><span class="self">self</span>, at: InputAt, empty: <span class="kw-2">&amp;</span>InstEmptyLook) -&gt; bool {
<span class="kw">use </span><span class="kw">crate</span>::prog::EmptyLook::<span class="kw-2">*</span>;
<span class="kw">match </span>empty.look {
StartLine =&gt; {
<span class="kw">let </span>c = <span class="self">self</span>.previous_char(at);
at.pos() == <span class="number">0 </span>|| c == <span class="string">&#39;\n&#39;
</span>}
EndLine =&gt; {
<span class="kw">let </span>c = <span class="self">self</span>.next_char(at);
at.pos() == <span class="self">self</span>.len() || c == <span class="string">&#39;\n&#39;
</span>}
StartText =&gt; at.pos() == <span class="number">0</span>,
EndText =&gt; at.pos() == <span class="self">self</span>.len(),
WordBoundary =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
c1.is_word_char() != c2.is_word_char()
}
NotWordBoundary =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
c1.is_word_char() == c2.is_word_char()
}
WordBoundaryAscii =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
<span class="kw">if </span><span class="self">self</span>.only_utf8 {
<span class="comment">// If we must match UTF-8, then we can&#39;t match word
// boundaries at invalid UTF-8.
</span><span class="kw">if </span>c1.is_none() &amp;&amp; !at.is_start() {
<span class="kw">return </span><span class="bool-val">false</span>;
}
<span class="kw">if </span>c2.is_none() &amp;&amp; !at.is_end() {
<span class="kw">return </span><span class="bool-val">false</span>;
}
}
c1.is_word_byte() != c2.is_word_byte()
}
NotWordBoundaryAscii =&gt; {
<span class="kw">let </span>(c1, c2) = (<span class="self">self</span>.previous_char(at), <span class="self">self</span>.next_char(at));
<span class="kw">if </span><span class="self">self</span>.only_utf8 {
<span class="comment">// If we must match UTF-8, then we can&#39;t match word
// boundaries at invalid UTF-8.
</span><span class="kw">if </span>c1.is_none() &amp;&amp; !at.is_start() {
<span class="kw">return </span><span class="bool-val">false</span>;
}
<span class="kw">if </span>c2.is_none() &amp;&amp; !at.is_end() {
<span class="kw">return </span><span class="bool-val">false</span>;
}
}
c1.is_word_byte() == c2.is_word_byte()
}
}
}
<span class="kw">fn </span>prefix_at(
<span class="kw-2">&amp;</span><span class="self">self</span>,
prefixes: <span class="kw-2">&amp;</span>LiteralSearcher,
at: InputAt,
) -&gt; <span class="prelude-ty">Option</span>&lt;InputAt&gt; {
prefixes.find(<span class="kw-2">&amp;</span><span class="self">self</span>[at.pos()..]).map(|(s, <span class="kw">_</span>)| <span class="self">self</span>.at(at.pos() + s))
}
<span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.text.len()
}
<span class="kw">fn </span>as_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
<span class="self">self</span>.text
}
}
<span class="doccomment">/// An inline representation of `Option&lt;char&gt;`.
///
/// This eliminates the need to do case analysis on `Option&lt;char&gt;` to determine
/// ordinality with other characters.
///
/// (The `Option&lt;char&gt;` is not related to encoding. Instead, it is used in the
/// matching engines to represent the beginning and ending boundaries of the
/// search text.)
</span><span class="attribute">#[derive(Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
</span><span class="kw">pub struct </span>Char(u32);
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Char {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="kw">match </span>char::from_u32(<span class="self">self</span>.<span class="number">0</span>) {
<span class="prelude-val">None </span>=&gt; <span class="macro">write!</span>(f, <span class="string">&quot;Empty&quot;</span>),
<span class="prelude-val">Some</span>(c) =&gt; <span class="macro">write!</span>(f, <span class="string">&quot;{:?}&quot;</span>, c),
}
}
}
<span class="kw">impl </span>Char {
<span class="doccomment">/// Returns true iff the character is absent.
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>is_none(<span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.<span class="number">0 </span>== u32::MAX
}
<span class="doccomment">/// Returns the length of the character&#39;s UTF-8 encoding.
///
/// If the character is absent, then `1` is returned.
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>len_utf8(<span class="self">self</span>) -&gt; usize {
char::from_u32(<span class="self">self</span>.<span class="number">0</span>).map_or(<span class="number">1</span>, |c| c.len_utf8())
}
<span class="doccomment">/// Returns true iff the character is a word character.
///
/// If the character is absent, then false is returned.
</span><span class="kw">pub fn </span>is_word_char(<span class="self">self</span>) -&gt; bool {
<span class="comment">// is_word_character can panic if the Unicode data for \w isn&#39;t
// available. However, our compiler ensures that if a Unicode word
// boundary is used, then the data must also be available. If it isn&#39;t,
// then the compiler returns an error.
</span>char::from_u32(<span class="self">self</span>.<span class="number">0</span>).map_or(<span class="bool-val">false</span>, regex_syntax::is_word_character)
}
<span class="doccomment">/// Returns true iff the byte is a word byte.
///
/// If the byte is absent, then false is returned.
</span><span class="kw">pub fn </span>is_word_byte(<span class="self">self</span>) -&gt; bool {
<span class="kw">match </span>char::from_u32(<span class="self">self</span>.<span class="number">0</span>) {
<span class="prelude-val">Some</span>(c) <span class="kw">if </span>c &lt;= <span class="string">&#39;\u{7F}&#39; </span>=&gt; regex_syntax::is_word_byte(c <span class="kw">as </span>u8),
<span class="prelude-val">None </span>| <span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl </span>From&lt;char&gt; <span class="kw">for </span>Char {
<span class="kw">fn </span>from(c: char) -&gt; Char {
Char(c <span class="kw">as </span>u32)
}
}
<span class="kw">impl </span>From&lt;<span class="prelude-ty">Option</span>&lt;char&gt;&gt; <span class="kw">for </span>Char {
<span class="kw">fn </span>from(c: <span class="prelude-ty">Option</span>&lt;char&gt;) -&gt; Char {
c.map_or(Char(u32::MAX), |c| c.into())
}
}
<span class="kw">impl </span>PartialEq&lt;char&gt; <span class="kw">for </span>Char {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>char) -&gt; bool {
<span class="self">self</span>.<span class="number">0 </span>== <span class="kw-2">*</span>other <span class="kw">as </span>u32
}
}
<span class="kw">impl </span>PartialEq&lt;Char&gt; <span class="kw">for </span>char {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Char) -&gt; bool {
<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u32 == other.<span class="number">0
</span>}
}
<span class="kw">impl </span>PartialOrd&lt;char&gt; <span class="kw">for </span>Char {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>char) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
<span class="self">self</span>.<span class="number">0</span>.partial_cmp(<span class="kw-2">&amp;</span>(<span class="kw-2">*</span>other <span class="kw">as </span>u32))
}
}
<span class="kw">impl </span>PartialOrd&lt;Char&gt; <span class="kw">for </span>char {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Char) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
(<span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u32).partial_cmp(<span class="kw-2">&amp;</span>other.<span class="number">0</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>