| <!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/compile.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>compile.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../regex/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../regex/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="1076">1076</span> |
| <span id="1077">1077</span> |
| <span id="1078">1078</span> |
| <span id="1079">1079</span> |
| <span id="1080">1080</span> |
| <span id="1081">1081</span> |
| <span id="1082">1082</span> |
| <span id="1083">1083</span> |
| <span id="1084">1084</span> |
| <span id="1085">1085</span> |
| <span id="1086">1086</span> |
| <span id="1087">1087</span> |
| <span id="1088">1088</span> |
| <span id="1089">1089</span> |
| <span id="1090">1090</span> |
| <span id="1091">1091</span> |
| <span id="1092">1092</span> |
| <span id="1093">1093</span> |
| <span id="1094">1094</span> |
| <span id="1095">1095</span> |
| <span id="1096">1096</span> |
| <span id="1097">1097</span> |
| <span id="1098">1098</span> |
| <span id="1099">1099</span> |
| <span id="1100">1100</span> |
| <span id="1101">1101</span> |
| <span id="1102">1102</span> |
| <span id="1103">1103</span> |
| <span id="1104">1104</span> |
| <span id="1105">1105</span> |
| <span id="1106">1106</span> |
| <span id="1107">1107</span> |
| <span id="1108">1108</span> |
| <span id="1109">1109</span> |
| <span id="1110">1110</span> |
| <span id="1111">1111</span> |
| <span id="1112">1112</span> |
| <span id="1113">1113</span> |
| <span id="1114">1114</span> |
| <span id="1115">1115</span> |
| <span id="1116">1116</span> |
| <span id="1117">1117</span> |
| <span id="1118">1118</span> |
| <span id="1119">1119</span> |
| <span id="1120">1120</span> |
| <span id="1121">1121</span> |
| <span id="1122">1122</span> |
| <span id="1123">1123</span> |
| <span id="1124">1124</span> |
| <span id="1125">1125</span> |
| <span id="1126">1126</span> |
| <span id="1127">1127</span> |
| <span id="1128">1128</span> |
| <span id="1129">1129</span> |
| <span id="1130">1130</span> |
| <span id="1131">1131</span> |
| <span id="1132">1132</span> |
| <span id="1133">1133</span> |
| <span id="1134">1134</span> |
| <span id="1135">1135</span> |
| <span id="1136">1136</span> |
| <span id="1137">1137</span> |
| <span id="1138">1138</span> |
| <span id="1139">1139</span> |
| <span id="1140">1140</span> |
| <span id="1141">1141</span> |
| <span id="1142">1142</span> |
| <span id="1143">1143</span> |
| <span id="1144">1144</span> |
| <span id="1145">1145</span> |
| <span id="1146">1146</span> |
| <span id="1147">1147</span> |
| <span id="1148">1148</span> |
| <span id="1149">1149</span> |
| <span id="1150">1150</span> |
| <span id="1151">1151</span> |
| <span id="1152">1152</span> |
| <span id="1153">1153</span> |
| <span id="1154">1154</span> |
| <span id="1155">1155</span> |
| <span id="1156">1156</span> |
| <span id="1157">1157</span> |
| <span id="1158">1158</span> |
| <span id="1159">1159</span> |
| <span id="1160">1160</span> |
| <span id="1161">1161</span> |
| <span id="1162">1162</span> |
| <span id="1163">1163</span> |
| <span id="1164">1164</span> |
| <span id="1165">1165</span> |
| <span id="1166">1166</span> |
| <span id="1167">1167</span> |
| <span id="1168">1168</span> |
| <span id="1169">1169</span> |
| <span id="1170">1170</span> |
| <span id="1171">1171</span> |
| <span id="1172">1172</span> |
| <span id="1173">1173</span> |
| <span id="1174">1174</span> |
| <span id="1175">1175</span> |
| <span id="1176">1176</span> |
| <span id="1177">1177</span> |
| <span id="1178">1178</span> |
| <span id="1179">1179</span> |
| <span id="1180">1180</span> |
| <span id="1181">1181</span> |
| <span id="1182">1182</span> |
| <span id="1183">1183</span> |
| <span id="1184">1184</span> |
| <span id="1185">1185</span> |
| <span id="1186">1186</span> |
| <span id="1187">1187</span> |
| <span id="1188">1188</span> |
| <span id="1189">1189</span> |
| <span id="1190">1190</span> |
| <span id="1191">1191</span> |
| <span id="1192">1192</span> |
| <span id="1193">1193</span> |
| <span id="1194">1194</span> |
| <span id="1195">1195</span> |
| <span id="1196">1196</span> |
| <span id="1197">1197</span> |
| <span id="1198">1198</span> |
| <span id="1199">1199</span> |
| <span id="1200">1200</span> |
| <span id="1201">1201</span> |
| <span id="1202">1202</span> |
| <span id="1203">1203</span> |
| <span id="1204">1204</span> |
| <span id="1205">1205</span> |
| <span id="1206">1206</span> |
| <span id="1207">1207</span> |
| <span id="1208">1208</span> |
| <span id="1209">1209</span> |
| <span id="1210">1210</span> |
| <span id="1211">1211</span> |
| <span id="1212">1212</span> |
| <span id="1213">1213</span> |
| <span id="1214">1214</span> |
| <span id="1215">1215</span> |
| <span id="1216">1216</span> |
| <span id="1217">1217</span> |
| <span id="1218">1218</span> |
| <span id="1219">1219</span> |
| <span id="1220">1220</span> |
| <span id="1221">1221</span> |
| <span id="1222">1222</span> |
| <span id="1223">1223</span> |
| <span id="1224">1224</span> |
| <span id="1225">1225</span> |
| <span id="1226">1226</span> |
| <span id="1227">1227</span> |
| <span id="1228">1228</span> |
| <span id="1229">1229</span> |
| <span id="1230">1230</span> |
| <span id="1231">1231</span> |
| <span id="1232">1232</span> |
| <span id="1233">1233</span> |
| <span id="1234">1234</span> |
| <span id="1235">1235</span> |
| <span id="1236">1236</span> |
| <span id="1237">1237</span> |
| <span id="1238">1238</span> |
| <span id="1239">1239</span> |
| <span id="1240">1240</span> |
| <span id="1241">1241</span> |
| <span id="1242">1242</span> |
| <span id="1243">1243</span> |
| <span id="1244">1244</span> |
| <span id="1245">1245</span> |
| <span id="1246">1246</span> |
| <span id="1247">1247</span> |
| <span id="1248">1248</span> |
| <span id="1249">1249</span> |
| <span id="1250">1250</span> |
| <span id="1251">1251</span> |
| <span id="1252">1252</span> |
| <span id="1253">1253</span> |
| <span id="1254">1254</span> |
| <span id="1255">1255</span> |
| <span id="1256">1256</span> |
| <span id="1257">1257</span> |
| <span id="1258">1258</span> |
| <span id="1259">1259</span> |
| <span id="1260">1260</span> |
| <span id="1261">1261</span> |
| <span id="1262">1262</span> |
| <span id="1263">1263</span> |
| <span id="1264">1264</span> |
| <span id="1265">1265</span> |
| <span id="1266">1266</span> |
| <span id="1267">1267</span> |
| <span id="1268">1268</span> |
| <span id="1269">1269</span> |
| <span id="1270">1270</span> |
| <span id="1271">1271</span> |
| <span id="1272">1272</span> |
| <span id="1273">1273</span> |
| <span id="1274">1274</span> |
| <span id="1275">1275</span> |
| <span id="1276">1276</span> |
| <span id="1277">1277</span> |
| <span id="1278">1278</span> |
| <span id="1279">1279</span> |
| <span id="1280">1280</span> |
| <span id="1281">1281</span> |
| <span id="1282">1282</span> |
| <span id="1283">1283</span> |
| <span id="1284">1284</span> |
| <span id="1285">1285</span> |
| <span id="1286">1286</span> |
| <span id="1287">1287</span> |
| <span id="1288">1288</span> |
| <span id="1289">1289</span> |
| <span id="1290">1290</span> |
| <span id="1291">1291</span> |
| <span id="1292">1292</span> |
| <span id="1293">1293</span> |
| <span id="1294">1294</span> |
| <span id="1295">1295</span> |
| <span id="1296">1296</span> |
| <span id="1297">1297</span> |
| <span id="1298">1298</span> |
| <span id="1299">1299</span> |
| <span id="1300">1300</span> |
| <span id="1301">1301</span> |
| <span id="1302">1302</span> |
| <span id="1303">1303</span> |
| <span id="1304">1304</span> |
| <span id="1305">1305</span> |
| <span id="1306">1306</span> |
| <span id="1307">1307</span> |
| <span id="1308">1308</span> |
| <span id="1309">1309</span> |
| <span id="1310">1310</span> |
| <span id="1311">1311</span> |
| <span id="1312">1312</span> |
| <span id="1313">1313</span> |
| <span id="1314">1314</span> |
| <span id="1315">1315</span> |
| <span id="1316">1316</span> |
| <span id="1317">1317</span> |
| <span id="1318">1318</span> |
| <span id="1319">1319</span> |
| <span id="1320">1320</span> |
| <span id="1321">1321</span> |
| <span id="1322">1322</span> |
| <span id="1323">1323</span> |
| <span id="1324">1324</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::iter; |
| <span class="kw">use </span>std::result; |
| <span class="kw">use </span>std::sync::Arc; |
| |
| <span class="kw">use </span>regex_syntax::hir::{<span class="self">self</span>, Hir, Look}; |
| <span class="kw">use </span>regex_syntax::is_word_byte; |
| <span class="kw">use </span>regex_syntax::utf8::{Utf8Range, Utf8Sequence, Utf8Sequences}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::prog::{ |
| EmptyLook, Inst, InstBytes, InstChar, InstEmptyLook, InstPtr, InstRanges, |
| InstSave, InstSplit, Program, |
| }; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::Error; |
| |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= result::Result<Patch, Error>; |
| <span class="kw">type </span>ResultOrEmpty = result::Result<<span class="prelude-ty">Option</span><Patch>, Error>; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>Patch { |
| hole: Hole, |
| entry: InstPtr, |
| } |
| |
| <span class="doccomment">/// A compiler translates a regular expression AST to a sequence of |
| /// instructions. The sequence of instructions represents an NFA. |
| </span><span class="comment">// `Compiler` is only public via the `internal` module, so avoid deriving |
| // `Debug`. |
| </span><span class="attribute">#[allow(missing_debug_implementations)] |
| </span><span class="kw">pub struct </span>Compiler { |
| insts: Vec<MaybeInst>, |
| compiled: Program, |
| capture_name_idx: HashMap<String, usize>, |
| num_exprs: usize, |
| size_limit: usize, |
| suffix_cache: SuffixCache, |
| utf8_seqs: <span class="prelude-ty">Option</span><Utf8Sequences>, |
| byte_classes: ByteClassSet, |
| <span class="comment">// This keeps track of extra bytes allocated while compiling the regex |
| // program. Currently, this corresponds to two things. First is the heap |
| // memory allocated by Unicode character classes ('InstRanges'). Second is |
| // a "fake" amount of memory used by empty sub-expressions, so that enough |
| // empty sub-expressions will ultimately trigger the compiler to bail |
| // because of a size limit restriction. (That empty sub-expressions don't |
| // add to heap memory usage is more-or-less an implementation detail.) In |
| // the second case, if we don't bail, then an excessively large repetition |
| // on an empty sub-expression can result in the compiler using a very large |
| // amount of CPU time. |
| </span>extra_inst_bytes: usize, |
| } |
| |
| <span class="kw">impl </span>Compiler { |
| <span class="doccomment">/// Create a new regular expression compiler. |
| /// |
| /// Various options can be set before calling `compile` on an expression. |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| Compiler { |
| insts: <span class="macro">vec!</span>[], |
| compiled: Program::new(), |
| capture_name_idx: HashMap::new(), |
| num_exprs: <span class="number">0</span>, |
| size_limit: <span class="number">10 </span>* (<span class="number">1 </span><< <span class="number">20</span>), |
| suffix_cache: SuffixCache::new(<span class="number">1000</span>), |
| utf8_seqs: <span class="prelude-val">Some</span>(Utf8Sequences::new(<span class="string">'\x00'</span>, <span class="string">'\x00'</span>)), |
| byte_classes: ByteClassSet::new(), |
| extra_inst_bytes: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="doccomment">/// The size of the resulting program is limited by size_limit. If |
| /// the program approximately exceeds the given size (in bytes), then |
| /// compilation will stop and return an error. |
| </span><span class="kw">pub fn </span>size_limit(<span class="kw-2">mut </span><span class="self">self</span>, size_limit: usize) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.size_limit = size_limit; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// If bytes is true, then the program is compiled as a byte based |
| /// automaton, which incorporates UTF-8 decoding into the machine. If it's |
| /// false, then the automaton is Unicode scalar value based, e.g., an |
| /// engine utilizing such an automaton is responsible for UTF-8 decoding. |
| /// |
| /// The specific invariant is that when returning a byte based machine, |
| /// the neither the `Char` nor `Ranges` instructions are produced. |
| /// Conversely, when producing a Unicode scalar value machine, the `Bytes` |
| /// instruction is never produced. |
| /// |
| /// Note that `dfa(true)` implies `bytes(true)`. |
| </span><span class="kw">pub fn </span>bytes(<span class="kw-2">mut </span><span class="self">self</span>, yes: bool) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.compiled.is_bytes = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// When disabled, the program compiled may match arbitrary bytes. |
| /// |
| /// When enabled (the default), all compiled programs exclusively match |
| /// valid UTF-8 bytes. |
| </span><span class="kw">pub fn </span>only_utf8(<span class="kw-2">mut </span><span class="self">self</span>, yes: bool) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.compiled.only_utf8 = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// When set, the machine returned is suitable for use in the DFA matching |
| /// engine. |
| /// |
| /// In particular, this ensures that if the regex is not anchored in the |
| /// beginning, then a preceding `.*?` is included in the program. (The NFA |
| /// based engines handle the preceding `.*?` explicitly, which is difficult |
| /// or impossible in the DFA engine.) |
| </span><span class="kw">pub fn </span>dfa(<span class="kw-2">mut </span><span class="self">self</span>, yes: bool) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.compiled.is_dfa = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// When set, the machine returned is suitable for matching text in |
| /// reverse. In particular, all concatenations are flipped. |
| </span><span class="kw">pub fn </span>reverse(<span class="kw-2">mut </span><span class="self">self</span>, yes: bool) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.compiled.is_reverse = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Compile a regular expression given its AST. |
| /// |
| /// The compiler is guaranteed to succeed unless the program exceeds the |
| /// specified size limit. If the size limit is exceeded, then compilation |
| /// stops and returns an error. |
| </span><span class="kw">pub fn </span>compile(<span class="kw-2">mut </span><span class="self">self</span>, exprs: <span class="kw-2">&</span>[Hir]) -> result::Result<Program, Error> { |
| <span class="macro">debug_assert!</span>(!exprs.is_empty()); |
| <span class="self">self</span>.num_exprs = exprs.len(); |
| <span class="kw">if </span>exprs.len() == <span class="number">1 </span>{ |
| <span class="self">self</span>.compile_one(<span class="kw-2">&</span>exprs[<span class="number">0</span>]) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.compile_many(exprs) |
| } |
| } |
| |
| <span class="kw">fn </span>compile_one(<span class="kw-2">mut </span><span class="self">self</span>, expr: <span class="kw-2">&</span>Hir) -> result::Result<Program, Error> { |
| <span class="comment">// If we're compiling a forward DFA and we aren't anchored, then |
| // add a `.*?` before the first capture group. |
| // Other matching engines handle this by baking the logic into the |
| // matching engine itself. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>dotstar_patch = Patch { hole: Hole::None, entry: <span class="number">0 </span>}; |
| <span class="self">self</span>.compiled.is_anchored_start = |
| expr.properties().look_set_prefix().contains(Look::Start); |
| <span class="self">self</span>.compiled.is_anchored_end = |
| expr.properties().look_set_suffix().contains(Look::End); |
| <span class="kw">if </span><span class="self">self</span>.compiled.needs_dotstar() { |
| dotstar_patch = <span class="self">self</span>.c_dotstar()<span class="question-mark">?</span>; |
| <span class="self">self</span>.compiled.start = dotstar_patch.entry; |
| } |
| <span class="self">self</span>.compiled.captures = <span class="macro">vec!</span>[<span class="prelude-val">None</span>]; |
| <span class="kw">let </span>patch = |
| <span class="self">self</span>.c_capture(<span class="number">0</span>, expr)<span class="question-mark">?</span>.unwrap_or_else(|| <span class="self">self</span>.next_inst()); |
| <span class="kw">if </span><span class="self">self</span>.compiled.needs_dotstar() { |
| <span class="self">self</span>.fill(dotstar_patch.hole, patch.entry); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.compiled.start = patch.entry; |
| } |
| <span class="self">self</span>.fill_to_next(patch.hole); |
| <span class="self">self</span>.compiled.matches = <span class="macro">vec!</span>[<span class="self">self</span>.insts.len()]; |
| <span class="self">self</span>.push_compiled(Inst::Match(<span class="number">0</span>)); |
| <span class="self">self</span>.compiled.static_captures_len = |
| expr.properties().static_explicit_captures_len(); |
| <span class="self">self</span>.compile_finish() |
| } |
| |
| <span class="kw">fn </span>compile_many( |
| <span class="kw-2">mut </span><span class="self">self</span>, |
| exprs: <span class="kw-2">&</span>[Hir], |
| ) -> result::Result<Program, Error> { |
| <span class="macro">debug_assert!</span>(exprs.len() > <span class="number">1</span>); |
| |
| <span class="self">self</span>.compiled.is_anchored_start = exprs |
| .iter() |
| .all(|e| e.properties().look_set_prefix().contains(Look::Start)); |
| <span class="self">self</span>.compiled.is_anchored_end = exprs |
| .iter() |
| .all(|e| e.properties().look_set_suffix().contains(Look::End)); |
| <span class="kw">let </span><span class="kw-2">mut </span>dotstar_patch = Patch { hole: Hole::None, entry: <span class="number">0 </span>}; |
| <span class="kw">if </span><span class="self">self</span>.compiled.needs_dotstar() { |
| dotstar_patch = <span class="self">self</span>.c_dotstar()<span class="question-mark">?</span>; |
| <span class="self">self</span>.compiled.start = dotstar_patch.entry; |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.compiled.start = <span class="number">0</span>; <span class="comment">// first instruction is always split |
| </span>} |
| <span class="self">self</span>.fill_to_next(dotstar_patch.hole); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>prev_hole = Hole::None; |
| <span class="kw">for </span>(i, expr) <span class="kw">in </span>exprs[<span class="number">0</span>..exprs.len() - <span class="number">1</span>].iter().enumerate() { |
| <span class="self">self</span>.fill_to_next(prev_hole); |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| <span class="kw">let </span>Patch { hole, entry } = |
| <span class="self">self</span>.c_capture(<span class="number">0</span>, expr)<span class="question-mark">?</span>.unwrap_or_else(|| <span class="self">self</span>.next_inst()); |
| <span class="self">self</span>.fill_to_next(hole); |
| <span class="self">self</span>.compiled.matches.push(<span class="self">self</span>.insts.len()); |
| <span class="self">self</span>.push_compiled(Inst::Match(i)); |
| prev_hole = <span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(entry), <span class="prelude-val">None</span>); |
| } |
| <span class="kw">let </span>i = exprs.len() - <span class="number">1</span>; |
| <span class="kw">let </span>Patch { hole, entry } = |
| <span class="self">self</span>.c_capture(<span class="number">0</span>, <span class="kw-2">&</span>exprs[i])<span class="question-mark">?</span>.unwrap_or_else(|| <span class="self">self</span>.next_inst()); |
| <span class="self">self</span>.fill(prev_hole, entry); |
| <span class="self">self</span>.fill_to_next(hole); |
| <span class="self">self</span>.compiled.matches.push(<span class="self">self</span>.insts.len()); |
| <span class="self">self</span>.push_compiled(Inst::Match(i)); |
| <span class="self">self</span>.compile_finish() |
| } |
| |
| <span class="kw">fn </span>compile_finish(<span class="kw-2">mut </span><span class="self">self</span>) -> result::Result<Program, Error> { |
| <span class="self">self</span>.compiled.insts = |
| <span class="self">self</span>.insts.into_iter().map(|inst| inst.unwrap()).collect(); |
| <span class="self">self</span>.compiled.byte_classes = <span class="self">self</span>.byte_classes.byte_classes(); |
| <span class="self">self</span>.compiled.capture_name_idx = Arc::new(<span class="self">self</span>.capture_name_idx); |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.compiled) |
| } |
| |
| <span class="doccomment">/// Compile expr into self.insts, returning a patch on success, |
| /// or an error if we run out of memory. |
| /// |
| /// All of the c_* methods of the compiler share the contract outlined |
| /// here. |
| /// |
| /// The main thing that a c_* method does is mutate `self.insts` |
| /// to add a list of mostly compiled instructions required to execute |
| /// the given expression. `self.insts` contains MaybeInsts rather than |
| /// Insts because there is some backpatching required. |
| /// |
| /// The `Patch` value returned by each c_* method provides metadata |
| /// about the compiled instructions emitted to `self.insts`. The |
| /// `entry` member of the patch refers to the first instruction |
| /// (the entry point), while the `hole` member contains zero or |
| /// more offsets to partial instructions that need to be backpatched. |
| /// The c_* routine can't know where its list of instructions are going to |
| /// jump to after execution, so it is up to the caller to patch |
| /// these jumps to point to the right place. So compiling some |
| /// expression, e, we would end up with a situation that looked like: |
| /// |
| /// ```text |
| /// self.insts = [ ..., i1, i2, ..., iexit1, ..., iexitn, ...] |
| /// ^ ^ ^ |
| /// | \ / |
| /// entry \ / |
| /// hole |
| /// ``` |
| /// |
| /// To compile two expressions, e1 and e2, concatenated together we |
| /// would do: |
| /// |
| /// ```ignore |
| /// let patch1 = self.c(e1); |
| /// let patch2 = self.c(e2); |
| /// ``` |
| /// |
| /// while leaves us with a situation that looks like |
| /// |
| /// ```text |
| /// self.insts = [ ..., i1, ..., iexit1, ..., i2, ..., iexit2 ] |
| /// ^ ^ ^ ^ |
| /// | | | | |
| /// entry1 hole1 entry2 hole2 |
| /// ``` |
| /// |
| /// Then to merge the two patches together into one we would backpatch |
| /// hole1 with entry2 and return a new patch that enters at entry1 |
| /// and has hole2 for a hole. In fact, if you look at the c_concat |
| /// method you will see that it does exactly this, though it handles |
| /// a list of expressions rather than just the two that we use for |
| /// an example. |
| /// |
| /// Ok(None) is returned when an expression is compiled to no |
| /// instruction, and so no patch.entry value makes sense. |
| </span><span class="kw">fn </span>c(<span class="kw-2">&mut </span><span class="self">self</span>, expr: <span class="kw-2">&</span>Hir) -> ResultOrEmpty { |
| <span class="kw">use </span><span class="kw">crate</span>::prog; |
| <span class="kw">use </span>regex_syntax::hir::HirKind::<span class="kw-2">*</span>; |
| |
| <span class="self">self</span>.check_size()<span class="question-mark">?</span>; |
| <span class="kw">match </span><span class="kw-2">*</span>expr.kind() { |
| Empty => <span class="self">self</span>.c_empty(), |
| Literal(hir::Literal(<span class="kw-2">ref </span>bytes)) => { |
| <span class="kw">if </span><span class="self">self</span>.compiled.is_reverse { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = bytes.to_vec(); |
| bytes.reverse(); |
| <span class="self">self</span>.c_literal(<span class="kw-2">&</span>bytes) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.c_literal(bytes) |
| } |
| } |
| Class(hir::Class::Unicode(<span class="kw-2">ref </span>cls)) => <span class="self">self</span>.c_class(cls.ranges()), |
| Class(hir::Class::Bytes(<span class="kw-2">ref </span>cls)) => { |
| <span class="kw">if </span><span class="self">self</span>.compiled.uses_bytes() { |
| <span class="self">self</span>.c_class_bytes(cls.ranges()) |
| } <span class="kw">else </span>{ |
| <span class="macro">assert!</span>(cls.is_ascii()); |
| <span class="kw">let </span><span class="kw-2">mut </span>char_ranges = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>r <span class="kw">in </span>cls.iter() { |
| <span class="kw">let </span>(s, e) = (r.start() <span class="kw">as </span>char, r.end() <span class="kw">as </span>char); |
| char_ranges.push(hir::ClassUnicodeRange::new(s, e)); |
| } |
| <span class="self">self</span>.c_class(<span class="kw-2">&</span>char_ranges) |
| } |
| } |
| Look(<span class="kw-2">ref </span>look) => <span class="kw">match </span><span class="kw-2">*</span>look { |
| hir::Look::Start <span class="kw">if </span><span class="self">self</span>.compiled.is_reverse => { |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::EndText) |
| } |
| hir::Look::Start => { |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::StartText) |
| } |
| hir::Look::End <span class="kw">if </span><span class="self">self</span>.compiled.is_reverse => { |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::StartText) |
| } |
| hir::Look::End => <span class="self">self</span>.c_empty_look(prog::EmptyLook::EndText), |
| hir::Look::StartLF <span class="kw">if </span><span class="self">self</span>.compiled.is_reverse => { |
| <span class="self">self</span>.byte_classes.set_range(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::EndLine) |
| } |
| hir::Look::StartLF => { |
| <span class="self">self</span>.byte_classes.set_range(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::StartLine) |
| } |
| hir::Look::EndLF <span class="kw">if </span><span class="self">self</span>.compiled.is_reverse => { |
| <span class="self">self</span>.byte_classes.set_range(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::StartLine) |
| } |
| hir::Look::EndLF => { |
| <span class="self">self</span>.byte_classes.set_range(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::EndLine) |
| } |
| hir::Look::StartCRLF | hir::Look::EndCRLF => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Syntax( |
| <span class="string">"CRLF-aware line anchors are not supported yet" |
| </span>.to_string(), |
| )); |
| } |
| hir::Look::WordAscii => { |
| <span class="self">self</span>.byte_classes.set_word_boundary(); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::WordBoundaryAscii) |
| } |
| hir::Look::WordAsciiNegate => { |
| <span class="self">self</span>.byte_classes.set_word_boundary(); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::NotWordBoundaryAscii) |
| } |
| hir::Look::WordUnicode => { |
| <span class="kw">if </span>!<span class="macro">cfg!</span>(feature = <span class="string">"unicode-perl"</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Syntax( |
| <span class="string">"Unicode word boundaries are unavailable when \ |
| the unicode-perl feature is disabled" |
| </span>.to_string(), |
| )); |
| } |
| <span class="self">self</span>.compiled.has_unicode_word_boundary = <span class="bool-val">true</span>; |
| <span class="self">self</span>.byte_classes.set_word_boundary(); |
| <span class="comment">// We also make sure that all ASCII bytes are in a different |
| // class from non-ASCII bytes. Otherwise, it's possible for |
| // ASCII bytes to get lumped into the same class as non-ASCII |
| // bytes. This in turn may cause the lazy DFA to falsely start |
| // when it sees an ASCII byte that maps to a byte class with |
| // non-ASCII bytes. This ensures that never happens. |
| </span><span class="self">self</span>.byte_classes.set_range(<span class="number">0</span>, <span class="number">0x7F</span>); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::WordBoundary) |
| } |
| hir::Look::WordUnicodeNegate => { |
| <span class="kw">if </span>!<span class="macro">cfg!</span>(feature = <span class="string">"unicode-perl"</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Syntax( |
| <span class="string">"Unicode word boundaries are unavailable when \ |
| the unicode-perl feature is disabled" |
| </span>.to_string(), |
| )); |
| } |
| <span class="self">self</span>.compiled.has_unicode_word_boundary = <span class="bool-val">true</span>; |
| <span class="self">self</span>.byte_classes.set_word_boundary(); |
| <span class="comment">// See comments above for why we set the ASCII range here. |
| </span><span class="self">self</span>.byte_classes.set_range(<span class="number">0</span>, <span class="number">0x7F</span>); |
| <span class="self">self</span>.c_empty_look(prog::EmptyLook::NotWordBoundary) |
| } |
| }, |
| Capture(hir::Capture { index, <span class="kw-2">ref </span>name, <span class="kw-2">ref </span>sub }) => { |
| <span class="kw">if </span>index <span class="kw">as </span>usize >= <span class="self">self</span>.compiled.captures.len() { |
| <span class="kw">let </span>name = <span class="kw">match </span><span class="kw-2">*</span>name { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(<span class="kw-2">ref </span>boxed_str) => <span class="prelude-val">Some</span>(boxed_str.to_string()), |
| }; |
| <span class="self">self</span>.compiled.captures.push(name.clone()); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(name) = name { |
| <span class="self">self</span>.capture_name_idx.insert(name, index <span class="kw">as </span>usize); |
| } |
| } |
| <span class="self">self</span>.c_capture(<span class="number">2 </span>* index <span class="kw">as </span>usize, sub) |
| } |
| Concat(<span class="kw-2">ref </span>es) => { |
| <span class="kw">if </span><span class="self">self</span>.compiled.is_reverse { |
| <span class="self">self</span>.c_concat(es.iter().rev()) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.c_concat(es) |
| } |
| } |
| Alternation(<span class="kw-2">ref </span>es) => <span class="self">self</span>.c_alternate(<span class="kw-2">&**</span>es), |
| Repetition(<span class="kw-2">ref </span>rep) => <span class="self">self</span>.c_repeat(rep), |
| } |
| } |
| |
| <span class="kw">fn </span>c_empty(<span class="kw-2">&mut </span><span class="self">self</span>) -> ResultOrEmpty { |
| <span class="comment">// See: https://github.com/rust-lang/regex/security/advisories/GHSA-m5pq-gvj9-9vr8 |
| // See: CVE-2022-24713 |
| // |
| // Since 'empty' sub-expressions don't increase the size of |
| // the actual compiled object, we "fake" an increase in its |
| // size so that our 'check_size_limit' routine will eventually |
| // stop compilation if there are too many empty sub-expressions |
| // (e.g., via a large repetition). |
| </span><span class="self">self</span>.extra_inst_bytes += std::mem::size_of::<Inst>(); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) |
| } |
| |
| <span class="kw">fn </span>c_capture(<span class="kw-2">&mut </span><span class="self">self</span>, first_slot: usize, expr: <span class="kw-2">&</span>Hir) -> ResultOrEmpty { |
| <span class="kw">if </span><span class="self">self</span>.num_exprs > <span class="number">1 </span>|| <span class="self">self</span>.compiled.is_dfa { |
| <span class="comment">// Don't ever compile Save instructions for regex sets because |
| // they are never used. They are also never used in DFA programs |
| // because DFAs can't handle captures. |
| </span><span class="self">self</span>.c(expr) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>entry = <span class="self">self</span>.insts.len(); |
| <span class="kw">let </span>hole = <span class="self">self</span>.push_hole(InstHole::Save { slot: first_slot }); |
| <span class="kw">let </span>patch = <span class="self">self</span>.c(expr)<span class="question-mark">?</span>.unwrap_or_else(|| <span class="self">self</span>.next_inst()); |
| <span class="self">self</span>.fill(hole, patch.entry); |
| <span class="self">self</span>.fill_to_next(patch.hole); |
| <span class="kw">let </span>hole = <span class="self">self</span>.push_hole(InstHole::Save { slot: first_slot + <span class="number">1 </span>}); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry })) |
| } |
| } |
| |
| <span class="kw">fn </span>c_dotstar(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result </span>{ |
| <span class="kw">let </span>hir = <span class="kw">if </span><span class="self">self</span>.compiled.only_utf8() { |
| Hir::dot(hir::Dot::AnyChar) |
| } <span class="kw">else </span>{ |
| Hir::dot(hir::Dot::AnyByte) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="self">self |
| </span>.c(<span class="kw-2">&</span>Hir::repetition(hir::Repetition { |
| min: <span class="number">0</span>, |
| max: <span class="prelude-val">None</span>, |
| greedy: <span class="bool-val">false</span>, |
| sub: Box::new(hir), |
| }))<span class="question-mark">? |
| </span>.unwrap()) |
| } |
| |
| <span class="kw">fn </span>c_char(<span class="kw-2">&mut </span><span class="self">self</span>, c: char) -> ResultOrEmpty { |
| <span class="kw">if </span><span class="self">self</span>.compiled.uses_bytes() { |
| <span class="kw">if </span>c.is_ascii() { |
| <span class="kw">let </span>b = c <span class="kw">as </span>u8; |
| <span class="kw">let </span>hole = |
| <span class="self">self</span>.push_hole(InstHole::Bytes { start: b, end: b }); |
| <span class="self">self</span>.byte_classes.set_range(b, b); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry: <span class="self">self</span>.insts.len() - <span class="number">1 </span>})) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.c_class(<span class="kw-2">&</span>[hir::ClassUnicodeRange::new(c, c)]) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>hole = <span class="self">self</span>.push_hole(InstHole::Char { c }); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry: <span class="self">self</span>.insts.len() - <span class="number">1 </span>})) |
| } |
| } |
| |
| <span class="kw">fn </span>c_class(<span class="kw-2">&mut </span><span class="self">self</span>, ranges: <span class="kw-2">&</span>[hir::ClassUnicodeRange]) -> ResultOrEmpty { |
| <span class="kw">use </span>std::mem::size_of; |
| |
| <span class="kw">if </span>ranges.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Syntax( |
| <span class="string">"empty character classes are not allowed"</span>.to_string(), |
| )); |
| } |
| <span class="kw">if </span><span class="self">self</span>.compiled.uses_bytes() { |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(CompileClass { c: <span class="self">self</span>, ranges }.compile()<span class="question-mark">?</span>)) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>ranges: Vec<(char, char)> = |
| ranges.iter().map(|r| (r.start(), r.end())).collect(); |
| <span class="kw">let </span>hole = <span class="kw">if </span>ranges.len() == <span class="number">1 </span>&& ranges[<span class="number">0</span>].<span class="number">0 </span>== ranges[<span class="number">0</span>].<span class="number">1 </span>{ |
| <span class="self">self</span>.push_hole(InstHole::Char { c: ranges[<span class="number">0</span>].<span class="number">0 </span>}) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.extra_inst_bytes += |
| ranges.len() * (size_of::<char>() * <span class="number">2</span>); |
| <span class="self">self</span>.push_hole(InstHole::Ranges { ranges }) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry: <span class="self">self</span>.insts.len() - <span class="number">1 </span>})) |
| } |
| } |
| |
| <span class="kw">fn </span>c_byte(<span class="kw-2">&mut </span><span class="self">self</span>, b: u8) -> ResultOrEmpty { |
| <span class="self">self</span>.c_class_bytes(<span class="kw-2">&</span>[hir::ClassBytesRange::new(b, b)]) |
| } |
| |
| <span class="kw">fn </span>c_class_bytes( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| ranges: <span class="kw-2">&</span>[hir::ClassBytesRange], |
| ) -> ResultOrEmpty { |
| <span class="kw">if </span>ranges.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Syntax( |
| <span class="string">"empty character classes are not allowed"</span>.to_string(), |
| )); |
| } |
| |
| <span class="kw">let </span>first_split_entry = <span class="self">self</span>.insts.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>holes = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>prev_hole = Hole::None; |
| <span class="kw">for </span>r <span class="kw">in </span><span class="kw-2">&</span>ranges[<span class="number">0</span>..ranges.len() - <span class="number">1</span>] { |
| <span class="self">self</span>.fill_to_next(prev_hole); |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| <span class="kw">let </span>next = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.byte_classes.set_range(r.start(), r.end()); |
| holes.push(<span class="self">self</span>.push_hole(InstHole::Bytes { |
| start: r.start(), |
| end: r.end(), |
| })); |
| prev_hole = <span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(next), <span class="prelude-val">None</span>); |
| } |
| <span class="kw">let </span>next = <span class="self">self</span>.insts.len(); |
| <span class="kw">let </span>r = <span class="kw-2">&</span>ranges[ranges.len() - <span class="number">1</span>]; |
| <span class="self">self</span>.byte_classes.set_range(r.start(), r.end()); |
| holes.push( |
| <span class="self">self</span>.push_hole(InstHole::Bytes { start: r.start(), end: r.end() }), |
| ); |
| <span class="self">self</span>.fill(prev_hole, next); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: Hole::Many(holes), entry: first_split_entry })) |
| } |
| |
| <span class="kw">fn </span>c_empty_look(<span class="kw-2">&mut </span><span class="self">self</span>, look: EmptyLook) -> ResultOrEmpty { |
| <span class="kw">let </span>hole = <span class="self">self</span>.push_hole(InstHole::EmptyLook { look }); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry: <span class="self">self</span>.insts.len() - <span class="number">1 </span>})) |
| } |
| |
| <span class="kw">fn </span>c_literal(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&</span>[u8]) -> ResultOrEmpty { |
| <span class="kw">match </span>core::str::from_utf8(bytes) { |
| <span class="prelude-val">Ok</span>(string) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>it = string.chars(); |
| <span class="kw">let </span>Patch { <span class="kw-2">mut </span>hole, entry } = <span class="kw">loop </span>{ |
| <span class="kw">match </span>it.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="self">self</span>.c_empty(), |
| <span class="prelude-val">Some</span>(ch) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = <span class="self">self</span>.c_char(ch)<span class="question-mark">? </span>{ |
| <span class="kw">break </span>p; |
| } |
| } |
| } |
| }; |
| <span class="kw">for </span>ch <span class="kw">in </span>it { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = <span class="self">self</span>.c_char(ch)<span class="question-mark">? </span>{ |
| <span class="self">self</span>.fill(hole, p.entry); |
| hole = p.hole; |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry })) |
| } |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| <span class="macro">assert!</span>(<span class="self">self</span>.compiled.uses_bytes()); |
| <span class="kw">let </span><span class="kw-2">mut </span>it = bytes.iter().copied(); |
| <span class="kw">let </span>Patch { <span class="kw-2">mut </span>hole, entry } = <span class="kw">loop </span>{ |
| <span class="kw">match </span>it.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="self">self</span>.c_empty(), |
| <span class="prelude-val">Some</span>(byte) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = <span class="self">self</span>.c_byte(byte)<span class="question-mark">? </span>{ |
| <span class="kw">break </span>p; |
| } |
| } |
| } |
| }; |
| <span class="kw">for </span>byte <span class="kw">in </span>it { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = <span class="self">self</span>.c_byte(byte)<span class="question-mark">? </span>{ |
| <span class="self">self</span>.fill(hole, p.entry); |
| hole = p.hole; |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry })) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>c_concat<<span class="lifetime">'a</span>, I>(<span class="kw-2">&mut </span><span class="self">self</span>, exprs: I) -> ResultOrEmpty |
| <span class="kw">where |
| </span>I: IntoIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>Hir>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>exprs = exprs.into_iter(); |
| <span class="kw">let </span>Patch { <span class="kw-2">mut </span>hole, entry } = <span class="kw">loop </span>{ |
| <span class="kw">match </span>exprs.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="self">self</span>.c_empty(), |
| <span class="prelude-val">Some</span>(e) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = <span class="self">self</span>.c(e)<span class="question-mark">? </span>{ |
| <span class="kw">break </span>p; |
| } |
| } |
| } |
| }; |
| <span class="kw">for </span>e <span class="kw">in </span>exprs { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(p) = <span class="self">self</span>.c(e)<span class="question-mark">? </span>{ |
| <span class="self">self</span>.fill(hole, p.entry); |
| hole = p.hole; |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole, entry })) |
| } |
| |
| <span class="kw">fn </span>c_alternate(<span class="kw-2">&mut </span><span class="self">self</span>, exprs: <span class="kw-2">&</span>[Hir]) -> ResultOrEmpty { |
| <span class="macro">debug_assert!</span>( |
| exprs.len() >= <span class="number">2</span>, |
| <span class="string">"alternates must have at least 2 exprs" |
| </span>); |
| |
| <span class="comment">// Initial entry point is always the first split. |
| </span><span class="kw">let </span>first_split_entry = <span class="self">self</span>.insts.len(); |
| |
| <span class="comment">// Save up all of the holes from each alternate. They will all get |
| // patched to point to the same location. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>holes = <span class="macro">vec!</span>[]; |
| |
| <span class="comment">// true indicates that the hole is a split where we want to fill |
| // the second branch. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>prev_hole = (Hole::None, <span class="bool-val">false</span>); |
| <span class="kw">for </span>e <span class="kw">in </span><span class="kw-2">&</span>exprs[<span class="number">0</span>..exprs.len() - <span class="number">1</span>] { |
| <span class="kw">if </span>prev_hole.<span class="number">1 </span>{ |
| <span class="kw">let </span>next = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.fill_split(prev_hole.<span class="number">0</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(next)); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.fill_to_next(prev_hole.<span class="number">0</span>); |
| } |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(Patch { hole, entry }) = <span class="self">self</span>.c(e)<span class="question-mark">? </span>{ |
| holes.push(hole); |
| prev_hole = (<span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(entry), <span class="prelude-val">None</span>), <span class="bool-val">false</span>); |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>(split1, split2) = split.dup_one(); |
| holes.push(split1); |
| prev_hole = (split2, <span class="bool-val">true</span>); |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(Patch { hole, entry }) = <span class="self">self</span>.c(<span class="kw-2">&</span>exprs[exprs.len() - <span class="number">1</span>])<span class="question-mark">? </span>{ |
| holes.push(hole); |
| <span class="kw">if </span>prev_hole.<span class="number">1 </span>{ |
| <span class="self">self</span>.fill_split(prev_hole.<span class="number">0</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(entry)); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.fill(prev_hole.<span class="number">0</span>, entry); |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// We ignore prev_hole.1. When it's true, it means we have two |
| // empty branches both pushing prev_hole.0 into holes, so both |
| // branches will go to the same place anyway. |
| </span>holes.push(prev_hole.<span class="number">0</span>); |
| } |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: Hole::Many(holes), entry: first_split_entry })) |
| } |
| |
| <span class="kw">fn </span>c_repeat(<span class="kw-2">&mut </span><span class="self">self</span>, rep: <span class="kw-2">&</span>hir::Repetition) -> ResultOrEmpty { |
| <span class="kw">match </span>(rep.min, rep.max) { |
| (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">1</span>)) => <span class="self">self</span>.c_repeat_zero_or_one(<span class="kw-2">&</span>rep.sub, rep.greedy), |
| (<span class="number">0</span>, <span class="prelude-val">None</span>) => <span class="self">self</span>.c_repeat_zero_or_more(<span class="kw-2">&</span>rep.sub, rep.greedy), |
| (<span class="number">1</span>, <span class="prelude-val">None</span>) => <span class="self">self</span>.c_repeat_one_or_more(<span class="kw-2">&</span>rep.sub, rep.greedy), |
| (min, <span class="prelude-val">None</span>) => { |
| <span class="self">self</span>.c_repeat_range_min_or_more(<span class="kw-2">&</span>rep.sub, rep.greedy, min) |
| } |
| (min, <span class="prelude-val">Some</span>(max)) => { |
| <span class="self">self</span>.c_repeat_range(<span class="kw-2">&</span>rep.sub, rep.greedy, min, max) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>c_repeat_zero_or_one( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| expr: <span class="kw-2">&</span>Hir, |
| greedy: bool, |
| ) -> ResultOrEmpty { |
| <span class="kw">let </span>split_entry = <span class="self">self</span>.insts.len(); |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| <span class="kw">let </span>Patch { hole: hole_rep, entry: entry_rep } = <span class="kw">match </span><span class="self">self</span>.c(expr)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(p) => p, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="self">self</span>.pop_split_hole(), |
| }; |
| <span class="kw">let </span>split_hole = <span class="kw">if </span>greedy { |
| <span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(entry_rep), <span class="prelude-val">None</span>) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.fill_split(split, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(entry_rep)) |
| }; |
| <span class="kw">let </span>holes = <span class="macro">vec!</span>[hole_rep, split_hole]; |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: Hole::Many(holes), entry: split_entry })) |
| } |
| |
| <span class="kw">fn </span>c_repeat_zero_or_more( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| expr: <span class="kw-2">&</span>Hir, |
| greedy: bool, |
| ) -> ResultOrEmpty { |
| <span class="kw">let </span>split_entry = <span class="self">self</span>.insts.len(); |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| <span class="kw">let </span>Patch { hole: hole_rep, entry: entry_rep } = <span class="kw">match </span><span class="self">self</span>.c(expr)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(p) => p, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="self">self</span>.pop_split_hole(), |
| }; |
| |
| <span class="self">self</span>.fill(hole_rep, split_entry); |
| <span class="kw">let </span>split_hole = <span class="kw">if </span>greedy { |
| <span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(entry_rep), <span class="prelude-val">None</span>) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.fill_split(split, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(entry_rep)) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: split_hole, entry: split_entry })) |
| } |
| |
| <span class="kw">fn </span>c_repeat_one_or_more( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| expr: <span class="kw-2">&</span>Hir, |
| greedy: bool, |
| ) -> ResultOrEmpty { |
| <span class="kw">let </span>Patch { hole: hole_rep, entry: entry_rep } = <span class="kw">match </span><span class="self">self</span>.c(expr)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(p) => p, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), |
| }; |
| <span class="self">self</span>.fill_to_next(hole_rep); |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| |
| <span class="kw">let </span>split_hole = <span class="kw">if </span>greedy { |
| <span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(entry_rep), <span class="prelude-val">None</span>) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.fill_split(split, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(entry_rep)) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: split_hole, entry: entry_rep })) |
| } |
| |
| <span class="kw">fn </span>c_repeat_range_min_or_more( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| expr: <span class="kw-2">&</span>Hir, |
| greedy: bool, |
| min: u32, |
| ) -> ResultOrEmpty { |
| <span class="kw">let </span>min = u32_to_usize(min); |
| <span class="comment">// Using next_inst() is ok, because we can't return it (concat would |
| // have to return Some(_) while c_repeat_range_min_or_more returns |
| // None). |
| </span><span class="kw">let </span>patch_concat = <span class="self">self |
| </span>.c_concat(iter::repeat(expr).take(min))<span class="question-mark">? |
| </span>.unwrap_or_else(|| <span class="self">self</span>.next_inst()); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(patch_rep) = <span class="self">self</span>.c_repeat_zero_or_more(expr, greedy)<span class="question-mark">? </span>{ |
| <span class="self">self</span>.fill(patch_concat.hole, patch_rep.entry); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: patch_rep.hole, entry: patch_concat.entry })) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>c_repeat_range( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| expr: <span class="kw-2">&</span>Hir, |
| greedy: bool, |
| min: u32, |
| max: u32, |
| ) -> ResultOrEmpty { |
| <span class="kw">let </span>(min, max) = (u32_to_usize(min), u32_to_usize(max)); |
| <span class="macro">debug_assert!</span>(min <= max); |
| <span class="kw">let </span>patch_concat = <span class="self">self</span>.c_concat(iter::repeat(expr).take(min))<span class="question-mark">?</span>; |
| <span class="kw">if </span>min == max { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(patch_concat); |
| } |
| <span class="comment">// Same reasoning as in c_repeat_range_min_or_more (we know that min < |
| // max at this point). |
| </span><span class="kw">let </span>patch_concat = patch_concat.unwrap_or_else(|| <span class="self">self</span>.next_inst()); |
| <span class="kw">let </span>initial_entry = patch_concat.entry; |
| <span class="comment">// It is much simpler to compile, e.g., `a{2,5}` as: |
| // |
| // aaa?a?a? |
| // |
| // But you end up with a sequence of instructions like this: |
| // |
| // 0: 'a' |
| // 1: 'a', |
| // 2: split(3, 4) |
| // 3: 'a' |
| // 4: split(5, 6) |
| // 5: 'a' |
| // 6: split(7, 8) |
| // 7: 'a' |
| // 8: MATCH |
| // |
| // This is *incredibly* inefficient because the splits end |
| // up forming a chain, which has to be resolved everything a |
| // transition is followed. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>holes = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>prev_hole = patch_concat.hole; |
| <span class="kw">for _ in </span>min..max { |
| <span class="self">self</span>.fill_to_next(prev_hole); |
| <span class="kw">let </span>split = <span class="self">self</span>.push_split_hole(); |
| <span class="kw">let </span>Patch { hole, entry } = <span class="kw">match </span><span class="self">self</span>.c(expr)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(p) => p, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="self">self</span>.pop_split_hole(), |
| }; |
| prev_hole = hole; |
| <span class="kw">if </span>greedy { |
| holes.push(<span class="self">self</span>.fill_split(split, <span class="prelude-val">Some</span>(entry), <span class="prelude-val">None</span>)); |
| } <span class="kw">else </span>{ |
| holes.push(<span class="self">self</span>.fill_split(split, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(entry))); |
| } |
| } |
| holes.push(prev_hole); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(Patch { hole: Hole::Many(holes), entry: initial_entry })) |
| } |
| |
| <span class="doccomment">/// Can be used as a default value for the c_* functions when the call to |
| /// c_function is followed by inserting at least one instruction that is |
| /// always executed after the ones written by the c* function. |
| </span><span class="kw">fn </span>next_inst(<span class="kw-2">&</span><span class="self">self</span>) -> Patch { |
| Patch { hole: Hole::None, entry: <span class="self">self</span>.insts.len() } |
| } |
| |
| <span class="kw">fn </span>fill(<span class="kw-2">&mut </span><span class="self">self</span>, hole: Hole, goto: InstPtr) { |
| <span class="kw">match </span>hole { |
| Hole::None => {} |
| Hole::One(pc) => { |
| <span class="self">self</span>.insts[pc].fill(goto); |
| } |
| Hole::Many(holes) => { |
| <span class="kw">for </span>hole <span class="kw">in </span>holes { |
| <span class="self">self</span>.fill(hole, goto); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>fill_to_next(<span class="kw-2">&mut </span><span class="self">self</span>, hole: Hole) { |
| <span class="kw">let </span>next = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.fill(hole, next); |
| } |
| |
| <span class="kw">fn </span>fill_split( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| hole: Hole, |
| goto1: <span class="prelude-ty">Option</span><InstPtr>, |
| goto2: <span class="prelude-ty">Option</span><InstPtr>, |
| ) -> Hole { |
| <span class="kw">match </span>hole { |
| Hole::None => Hole::None, |
| Hole::One(pc) => <span class="kw">match </span>(goto1, goto2) { |
| (<span class="prelude-val">Some</span>(goto1), <span class="prelude-val">Some</span>(goto2)) => { |
| <span class="self">self</span>.insts[pc].fill_split(goto1, goto2); |
| Hole::None |
| } |
| (<span class="prelude-val">Some</span>(goto1), <span class="prelude-val">None</span>) => { |
| <span class="self">self</span>.insts[pc].half_fill_split_goto1(goto1); |
| Hole::One(pc) |
| } |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(goto2)) => { |
| <span class="self">self</span>.insts[pc].half_fill_split_goto2(goto2); |
| Hole::One(pc) |
| } |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => <span class="macro">unreachable!</span>( |
| <span class="string">"at least one of the split \ |
| holes must be filled" |
| </span>), |
| }, |
| Hole::Many(holes) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>new_holes = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>hole <span class="kw">in </span>holes { |
| new_holes.push(<span class="self">self</span>.fill_split(hole, goto1, goto2)); |
| } |
| <span class="kw">if </span>new_holes.is_empty() { |
| Hole::None |
| } <span class="kw">else if </span>new_holes.len() == <span class="number">1 </span>{ |
| new_holes.pop().unwrap() |
| } <span class="kw">else </span>{ |
| Hole::Many(new_holes) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>push_compiled(<span class="kw-2">&mut </span><span class="self">self</span>, inst: Inst) { |
| <span class="self">self</span>.insts.push(MaybeInst::Compiled(inst)); |
| } |
| |
| <span class="kw">fn </span>push_hole(<span class="kw-2">&mut </span><span class="self">self</span>, inst: InstHole) -> Hole { |
| <span class="kw">let </span>hole = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.insts.push(MaybeInst::Uncompiled(inst)); |
| Hole::One(hole) |
| } |
| |
| <span class="kw">fn </span>push_split_hole(<span class="kw-2">&mut </span><span class="self">self</span>) -> Hole { |
| <span class="kw">let </span>hole = <span class="self">self</span>.insts.len(); |
| <span class="self">self</span>.insts.push(MaybeInst::Split); |
| Hole::One(hole) |
| } |
| |
| <span class="kw">fn </span>pop_split_hole(<span class="kw-2">&mut </span><span class="self">self</span>) -> ResultOrEmpty { |
| <span class="self">self</span>.insts.pop(); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) |
| } |
| |
| <span class="kw">fn </span>check_size(<span class="kw-2">&</span><span class="self">self</span>) -> result::Result<(), Error> { |
| <span class="kw">use </span>std::mem::size_of; |
| |
| <span class="kw">let </span>size = |
| <span class="self">self</span>.extra_inst_bytes + (<span class="self">self</span>.insts.len() * size_of::<Inst>()); |
| <span class="kw">if </span>size > <span class="self">self</span>.size_limit { |
| <span class="prelude-val">Err</span>(Error::CompiledTooBig(<span class="self">self</span>.size_limit)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">enum </span>Hole { |
| <span class="prelude-val">None</span>, |
| One(InstPtr), |
| Many(Vec<Hole>), |
| } |
| |
| <span class="kw">impl </span>Hole { |
| <span class="kw">fn </span>dup_one(<span class="self">self</span>) -> (<span class="self">Self</span>, <span class="self">Self</span>) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Hole::One(pc) => (Hole::One(pc), Hole::One(pc)), |
| Hole::None | Hole::Many(<span class="kw">_</span>) => { |
| <span class="macro">unreachable!</span>(<span class="string">"must be called on single hole"</span>) |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">enum </span>MaybeInst { |
| Compiled(Inst), |
| Uncompiled(InstHole), |
| Split, |
| Split1(InstPtr), |
| Split2(InstPtr), |
| } |
| |
| <span class="kw">impl </span>MaybeInst { |
| <span class="kw">fn </span>fill(<span class="kw-2">&mut </span><span class="self">self</span>, goto: InstPtr) { |
| <span class="kw">let </span>maybeinst = <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| MaybeInst::Split => MaybeInst::Split1(goto), |
| MaybeInst::Uncompiled(<span class="kw-2">ref </span>inst) => { |
| MaybeInst::Compiled(inst.fill(goto)) |
| } |
| MaybeInst::Split1(goto1) => { |
| MaybeInst::Compiled(Inst::Split(InstSplit { |
| goto1, |
| goto2: goto, |
| })) |
| } |
| MaybeInst::Split2(goto2) => { |
| MaybeInst::Compiled(Inst::Split(InstSplit { |
| goto1: goto, |
| goto2, |
| })) |
| } |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>( |
| <span class="string">"not all instructions were compiled! \ |
| found uncompiled instruction: {:?}"</span>, |
| <span class="self">self |
| </span>), |
| }; |
| <span class="kw-2">*</span><span class="self">self </span>= maybeinst; |
| } |
| |
| <span class="kw">fn </span>fill_split(<span class="kw-2">&mut </span><span class="self">self</span>, goto1: InstPtr, goto2: InstPtr) { |
| <span class="kw">let </span>filled = <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| MaybeInst::Split => Inst::Split(InstSplit { goto1, goto2 }), |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>( |
| <span class="string">"must be called on Split instruction, \ |
| instead it was called on: {:?}"</span>, |
| <span class="self">self |
| </span>), |
| }; |
| <span class="kw-2">*</span><span class="self">self </span>= MaybeInst::Compiled(filled); |
| } |
| |
| <span class="kw">fn </span>half_fill_split_goto1(<span class="kw-2">&mut </span><span class="self">self</span>, goto1: InstPtr) { |
| <span class="kw">let </span>half_filled = <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| MaybeInst::Split => goto1, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>( |
| <span class="string">"must be called on Split instruction, \ |
| instead it was called on: {:?}"</span>, |
| <span class="self">self |
| </span>), |
| }; |
| <span class="kw-2">*</span><span class="self">self </span>= MaybeInst::Split1(half_filled); |
| } |
| |
| <span class="kw">fn </span>half_fill_split_goto2(<span class="kw-2">&mut </span><span class="self">self</span>, goto2: InstPtr) { |
| <span class="kw">let </span>half_filled = <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| MaybeInst::Split => goto2, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>( |
| <span class="string">"must be called on Split instruction, \ |
| instead it was called on: {:?}"</span>, |
| <span class="self">self |
| </span>), |
| }; |
| <span class="kw-2">*</span><span class="self">self </span>= MaybeInst::Split2(half_filled); |
| } |
| |
| <span class="kw">fn </span>unwrap(<span class="self">self</span>) -> Inst { |
| <span class="kw">match </span><span class="self">self </span>{ |
| MaybeInst::Compiled(inst) => inst, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>( |
| <span class="string">"must be called on a compiled instruction, \ |
| instead it was called on: {:?}"</span>, |
| <span class="self">self |
| </span>), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">enum </span>InstHole { |
| Save { slot: usize }, |
| EmptyLook { look: EmptyLook }, |
| Char { c: char }, |
| Ranges { ranges: Vec<(char, char)> }, |
| Bytes { start: u8, end: u8 }, |
| } |
| |
| <span class="kw">impl </span>InstHole { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, goto: InstPtr) -> Inst { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| InstHole::Save { slot } => Inst::Save(InstSave { goto, slot }), |
| InstHole::EmptyLook { look } => { |
| Inst::EmptyLook(InstEmptyLook { goto, look }) |
| } |
| InstHole::Char { c } => Inst::Char(InstChar { goto, c }), |
| InstHole::Ranges { <span class="kw-2">ref </span>ranges } => Inst::Ranges(InstRanges { |
| goto, |
| ranges: ranges.clone().into_boxed_slice(), |
| }), |
| InstHole::Bytes { start, end } => { |
| Inst::Bytes(InstBytes { goto, start, end }) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>CompileClass<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> { |
| c: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Compiler, |
| ranges: <span class="kw-2">&</span><span class="lifetime">'b </span>[hir::ClassUnicodeRange], |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> CompileClass<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>> { |
| <span class="kw">fn </span>compile(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>holes = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>initial_entry = <span class="prelude-val">None</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>last_split = Hole::None; |
| <span class="kw">let </span><span class="kw-2">mut </span>utf8_seqs = <span class="self">self</span>.c.utf8_seqs.take().unwrap(); |
| <span class="self">self</span>.c.suffix_cache.clear(); |
| |
| <span class="kw">for </span>(i, range) <span class="kw">in </span><span class="self">self</span>.ranges.iter().enumerate() { |
| <span class="kw">let </span>is_last_range = i + <span class="number">1 </span>== <span class="self">self</span>.ranges.len(); |
| utf8_seqs.reset(range.start(), range.end()); |
| <span class="kw">let </span><span class="kw-2">mut </span>it = (<span class="kw-2">&mut </span>utf8_seqs).peekable(); |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>utf8_seq = <span class="kw">match </span>it.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| <span class="prelude-val">Some</span>(utf8_seq) => utf8_seq, |
| }; |
| <span class="kw">if </span>is_last_range && it.peek().is_none() { |
| <span class="kw">let </span>Patch { hole, entry } = <span class="self">self</span>.c_utf8_seq(<span class="kw-2">&</span>utf8_seq)<span class="question-mark">?</span>; |
| holes.push(hole); |
| <span class="self">self</span>.c.fill(last_split, entry); |
| last_split = Hole::None; |
| <span class="kw">if </span>initial_entry.is_none() { |
| initial_entry = <span class="prelude-val">Some</span>(entry); |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">if </span>initial_entry.is_none() { |
| initial_entry = <span class="prelude-val">Some</span>(<span class="self">self</span>.c.insts.len()); |
| } |
| <span class="self">self</span>.c.fill_to_next(last_split); |
| last_split = <span class="self">self</span>.c.push_split_hole(); |
| <span class="kw">let </span>Patch { hole, entry } = <span class="self">self</span>.c_utf8_seq(<span class="kw-2">&</span>utf8_seq)<span class="question-mark">?</span>; |
| holes.push(hole); |
| last_split = |
| <span class="self">self</span>.c.fill_split(last_split, <span class="prelude-val">Some</span>(entry), <span class="prelude-val">None</span>); |
| } |
| } |
| } |
| <span class="self">self</span>.c.utf8_seqs = <span class="prelude-val">Some</span>(utf8_seqs); |
| <span class="prelude-val">Ok</span>(Patch { hole: Hole::Many(holes), entry: initial_entry.unwrap() }) |
| } |
| |
| <span class="kw">fn </span>c_utf8_seq(<span class="kw-2">&mut </span><span class="self">self</span>, seq: <span class="kw-2">&</span>Utf8Sequence) -> <span class="prelude-ty">Result </span>{ |
| <span class="kw">if </span><span class="self">self</span>.c.compiled.is_reverse { |
| <span class="self">self</span>.c_utf8_seq_(seq) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.c_utf8_seq_(seq.into_iter().rev()) |
| } |
| } |
| |
| <span class="kw">fn </span>c_utf8_seq_<<span class="lifetime">'r</span>, I>(<span class="kw-2">&mut </span><span class="self">self</span>, seq: I) -> <span class="prelude-ty">Result |
| </span><span class="kw">where |
| </span>I: IntoIterator<Item = <span class="kw-2">&</span><span class="lifetime">'r </span>Utf8Range>, |
| { |
| <span class="comment">// The initial instruction for each UTF-8 sequence should be the same. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>from_inst = ::std::usize::MAX; |
| <span class="kw">let </span><span class="kw-2">mut </span>last_hole = Hole::None; |
| <span class="kw">for </span>byte_range <span class="kw">in </span>seq { |
| <span class="kw">let </span>key = SuffixCacheKey { |
| from_inst, |
| start: byte_range.start, |
| end: byte_range.end, |
| }; |
| { |
| <span class="kw">let </span>pc = <span class="self">self</span>.c.insts.len(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(cached_pc) = <span class="self">self</span>.c.suffix_cache.get(key, pc) { |
| from_inst = cached_pc; |
| <span class="kw">continue</span>; |
| } |
| } |
| <span class="self">self</span>.c.byte_classes.set_range(byte_range.start, byte_range.end); |
| <span class="kw">if </span>from_inst == ::std::usize::MAX { |
| last_hole = <span class="self">self</span>.c.push_hole(InstHole::Bytes { |
| start: byte_range.start, |
| end: byte_range.end, |
| }); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.c.push_compiled(Inst::Bytes(InstBytes { |
| goto: from_inst, |
| start: byte_range.start, |
| end: byte_range.end, |
| })); |
| } |
| from_inst = <span class="self">self</span>.c.insts.len().checked_sub(<span class="number">1</span>).unwrap(); |
| <span class="macro">debug_assert!</span>(from_inst < ::std::usize::MAX); |
| } |
| <span class="macro">debug_assert!</span>(from_inst < ::std::usize::MAX); |
| <span class="prelude-val">Ok</span>(Patch { hole: last_hole, entry: from_inst }) |
| } |
| } |
| |
| <span class="doccomment">/// `SuffixCache` is a simple bounded hash map for caching suffix entries in |
| /// UTF-8 automata. For example, consider the Unicode range \u{0}-\u{FFFF}. |
| /// The set of byte ranges looks like this: |
| /// |
| /// [0-7F] |
| /// [C2-DF][80-BF] |
| /// [E0][A0-BF][80-BF] |
| /// [E1-EC][80-BF][80-BF] |
| /// [ED][80-9F][80-BF] |
| /// [EE-EF][80-BF][80-BF] |
| /// |
| /// Each line above translates to one alternate in the compiled regex program. |
| /// However, all but one of the alternates end in the same suffix, which is |
| /// a waste of an instruction. The suffix cache facilitates reusing them across |
| /// alternates. |
| /// |
| /// Note that a HashMap could be trivially used for this, but we don't need its |
| /// overhead. Some small bounded space (LRU style) is more than enough. |
| /// |
| /// This uses similar idea to [`SparseSet`](../sparse/struct.SparseSet.html), |
| /// except it uses hashes as original indices and then compares full keys for |
| /// validation against `dense` array. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>SuffixCache { |
| sparse: Box<[usize]>, |
| dense: Vec<SuffixCacheEntry>, |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)] |
| </span><span class="kw">struct </span>SuffixCacheEntry { |
| key: SuffixCacheKey, |
| pc: InstPtr, |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)] |
| </span><span class="kw">struct </span>SuffixCacheKey { |
| from_inst: InstPtr, |
| start: u8, |
| end: u8, |
| } |
| |
| <span class="kw">impl </span>SuffixCache { |
| <span class="kw">fn </span>new(size: usize) -> <span class="self">Self </span>{ |
| SuffixCache { |
| sparse: <span class="macro">vec!</span>[<span class="number">0usize</span>; size].into(), |
| dense: Vec::with_capacity(size), |
| } |
| } |
| |
| <span class="kw">fn </span>get(<span class="kw-2">&mut </span><span class="self">self</span>, key: SuffixCacheKey, pc: InstPtr) -> <span class="prelude-ty">Option</span><InstPtr> { |
| <span class="kw">let </span>hash = <span class="self">self</span>.hash(<span class="kw-2">&</span>key); |
| <span class="kw">let </span>pos = <span class="kw-2">&mut </span><span class="self">self</span>.sparse[hash]; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(entry) = <span class="self">self</span>.dense.get(<span class="kw-2">*</span>pos) { |
| <span class="kw">if </span>entry.key == key { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(entry.pc); |
| } |
| } |
| <span class="kw-2">*</span>pos = <span class="self">self</span>.dense.len(); |
| <span class="self">self</span>.dense.push(SuffixCacheEntry { key, pc }); |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.dense.clear(); |
| } |
| |
| <span class="kw">fn </span>hash(<span class="kw-2">&</span><span class="self">self</span>, suffix: <span class="kw-2">&</span>SuffixCacheKey) -> usize { |
| <span class="comment">// Basic FNV-1a hash as described: |
| // https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function |
| </span><span class="kw">const </span>FNV_PRIME: u64 = <span class="number">1_099_511_628_211</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>h = <span class="number">14_695_981_039_346_656_037</span>; |
| h = (h ^ (suffix.from_inst <span class="kw">as </span>u64)).wrapping_mul(FNV_PRIME); |
| h = (h ^ (suffix.start <span class="kw">as </span>u64)).wrapping_mul(FNV_PRIME); |
| h = (h ^ (suffix.end <span class="kw">as </span>u64)).wrapping_mul(FNV_PRIME); |
| (h <span class="kw">as </span>usize) % <span class="self">self</span>.sparse.len() |
| } |
| } |
| |
| <span class="kw">struct </span>ByteClassSet([bool; <span class="number">256</span>]); |
| |
| <span class="kw">impl </span>ByteClassSet { |
| <span class="kw">fn </span>new() -> <span class="self">Self </span>{ |
| ByteClassSet([<span class="bool-val">false</span>; <span class="number">256</span>]) |
| } |
| |
| <span class="kw">fn </span>set_range(<span class="kw-2">&mut </span><span class="self">self</span>, start: u8, end: u8) { |
| <span class="macro">debug_assert!</span>(start <= end); |
| <span class="kw">if </span>start > <span class="number">0 </span>{ |
| <span class="self">self</span>.<span class="number">0</span>[start <span class="kw">as </span>usize - <span class="number">1</span>] = <span class="bool-val">true</span>; |
| } |
| <span class="self">self</span>.<span class="number">0</span>[end <span class="kw">as </span>usize] = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">fn </span>set_word_boundary(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// We need to mark all ranges of bytes whose pairs result in |
| // evaluating \b differently. |
| </span><span class="kw">let </span>iswb = is_word_byte; |
| <span class="kw">let </span><span class="kw-2">mut </span>b1: u16 = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>b2: u16; |
| <span class="kw">while </span>b1 <= <span class="number">255 </span>{ |
| b2 = b1 + <span class="number">1</span>; |
| <span class="kw">while </span>b2 <= <span class="number">255 </span>&& iswb(b1 <span class="kw">as </span>u8) == iswb(b2 <span class="kw">as </span>u8) { |
| b2 += <span class="number">1</span>; |
| } |
| <span class="self">self</span>.set_range(b1 <span class="kw">as </span>u8, (b2 - <span class="number">1</span>) <span class="kw">as </span>u8); |
| b1 = b2; |
| } |
| } |
| |
| <span class="kw">fn </span>byte_classes(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<u8> { |
| <span class="comment">// N.B. If you're debugging the DFA, it's useful to simply return |
| // `(0..256).collect()`, which effectively removes the byte classes |
| // and makes the transitions easier to read. |
| // (0usize..256).map(|x| x as u8).collect() |
| </span><span class="kw">let </span><span class="kw-2">mut </span>byte_classes = <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">256</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>class = <span class="number">0u8</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">loop </span>{ |
| byte_classes[i] = class <span class="kw">as </span>u8; |
| <span class="kw">if </span>i >= <span class="number">255 </span>{ |
| <span class="kw">break</span>; |
| } |
| <span class="kw">if </span><span class="self">self</span>.<span class="number">0</span>[i] { |
| class = class.checked_add(<span class="number">1</span>).unwrap(); |
| } |
| i += <span class="number">1</span>; |
| } |
| byte_classes |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>ByteClassSet { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_tuple(<span class="string">"ByteClassSet"</span>).field(&&<span class="self">self</span>.<span class="number">0</span>[..]).finish() |
| } |
| } |
| |
| <span class="kw">fn </span>u32_to_usize(n: u32) -> usize { |
| <span class="comment">// In case usize is less than 32 bits, we need to guard against overflow. |
| // On most platforms this compiles to nothing. |
| // TODO Use `std::convert::TryFrom` once it's stable. |
| </span><span class="kw">if </span>(n <span class="kw">as </span>u64) > (::std::usize::MAX <span class="kw">as </span>u64) { |
| <span class="macro">panic!</span>(<span class="string">"BUG: {} is too big to be pointer sized"</span>, n) |
| } |
| n <span class="kw">as </span>usize |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::ByteClassSet; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>byte_classes() { |
| <span class="kw">let </span><span class="kw-2">mut </span>set = ByteClassSet::new(); |
| set.set_range(<span class="string">b'a'</span>, <span class="string">b'z'</span>); |
| <span class="kw">let </span>classes = set.byte_classes(); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">0</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">2</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="string">b'a' </span><span class="kw">as </span>usize - <span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="string">b'a' </span><span class="kw">as </span>usize], <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="string">b'm' </span><span class="kw">as </span>usize], <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="string">b'z' </span><span class="kw">as </span>usize], <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="string">b'z' </span><span class="kw">as </span>usize + <span class="number">1</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">254</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">255</span>], <span class="number">2</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set = ByteClassSet::new(); |
| set.set_range(<span class="number">0</span>, <span class="number">2</span>); |
| set.set_range(<span class="number">4</span>, <span class="number">6</span>); |
| <span class="kw">let </span>classes = set.byte_classes(); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">0</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">2</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">3</span>], <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">4</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">5</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">6</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">7</span>], <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(classes[<span class="number">255</span>], <span class="number">3</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>full_byte_classes() { |
| <span class="kw">let </span><span class="kw-2">mut </span>set = ByteClassSet::new(); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">256u16 </span>{ |
| set.set_range(i <span class="kw">as </span>u8, i <span class="kw">as </span>u8); |
| } |
| <span class="macro">assert_eq!</span>(set.byte_classes().len(), <span class="number">256</span>); |
| } |
| } |
| </code></pre></div> |
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