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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| <span id="1000">1000</span> |
| <span id="1001">1001</span> |
| <span id="1002">1002</span> |
| <span id="1003">1003</span> |
| <span id="1004">1004</span> |
| <span id="1005">1005</span> |
| <span id="1006">1006</span> |
| <span id="1007">1007</span> |
| <span id="1008">1008</span> |
| <span id="1009">1009</span> |
| <span id="1010">1010</span> |
| <span id="1011">1011</span> |
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| <span id="1016">1016</span> |
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| <span id="1018">1018</span> |
| <span id="1019">1019</span> |
| <span id="1020">1020</span> |
| <span id="1021">1021</span> |
| <span id="1022">1022</span> |
| <span id="1023">1023</span> |
| <span id="1024">1024</span> |
| <span id="1025">1025</span> |
| <span id="1026">1026</span> |
| <span id="1027">1027</span> |
| <span id="1028">1028</span> |
| <span id="1029">1029</span> |
| <span id="1030">1030</span> |
| <span id="1031">1031</span> |
| <span id="1032">1032</span> |
| <span id="1033">1033</span> |
| <span id="1034">1034</span> |
| <span id="1035">1035</span> |
| <span id="1036">1036</span> |
| <span id="1037">1037</span> |
| <span id="1038">1038</span> |
| <span id="1039">1039</span> |
| <span id="1040">1040</span> |
| <span id="1041">1041</span> |
| <span id="1042">1042</span> |
| <span id="1043">1043</span> |
| <span id="1044">1044</span> |
| <span id="1045">1045</span> |
| <span id="1046">1046</span> |
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| <span id="1048">1048</span> |
| <span id="1049">1049</span> |
| <span id="1050">1050</span> |
| <span id="1051">1051</span> |
| <span id="1052">1052</span> |
| <span id="1053">1053</span> |
| <span id="1054">1054</span> |
| <span id="1055">1055</span> |
| <span id="1056">1056</span> |
| <span id="1057">1057</span> |
| <span id="1058">1058</span> |
| <span id="1059">1059</span> |
| <span id="1060">1060</span> |
| <span id="1061">1061</span> |
| <span id="1062">1062</span> |
| <span id="1063">1063</span> |
| <span id="1064">1064</span> |
| <span id="1065">1065</span> |
| <span id="1066">1066</span> |
| <span id="1067">1067</span> |
| <span id="1068">1068</span> |
| <span id="1069">1069</span> |
| <span id="1070">1070</span> |
| <span id="1071">1071</span> |
| <span id="1072">1072</span> |
| <span id="1073">1073</span> |
| <span id="1074">1074</span> |
| <span id="1075">1075</span> |
| <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> |
| </pre><pre class="rust "> |
| <span class="comment">// Copyright 2014-2016 The Rust Project Developers. See the COPYRIGHT</span> |
| <span class="comment">// file at the top-level directory of this distribution and at</span> |
| <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">result</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>; |
| |
| <span class="kw">use</span> <span class="ident">syntax</span>::{ |
| <span class="ident">Expr</span>, <span class="ident">Repeater</span>, <span class="ident">CharClass</span>, <span class="ident">ClassRange</span>, <span class="ident">ByteClass</span>, <span class="ident">ByteRange</span>, |
| <span class="ident">is_word_byte</span>, |
| }; |
| <span class="kw">use</span> <span class="ident">utf8_ranges</span>::{<span class="ident">Utf8Range</span>, <span class="ident">Utf8Sequence</span>, <span class="ident">Utf8Sequences</span>}; |
| |
| <span class="kw">use</span> <span class="ident">prog</span>::{ |
| <span class="ident">Program</span>, <span class="ident">Inst</span>, <span class="ident">InstPtr</span>, <span class="ident">EmptyLook</span>, |
| <span class="ident">InstSave</span>, <span class="ident">InstSplit</span>, <span class="ident">InstEmptyLook</span>, <span class="ident">InstChar</span>, <span class="ident">InstRanges</span>, <span class="ident">InstBytes</span>, |
| }; |
| |
| <span class="kw">use</span> <span class="ident">Error</span>; |
| |
| <span class="kw">type</span> <span class="ident">InstHoleIdx</span> <span class="op">=</span> <span class="ident">InstPtr</span>; |
| |
| <span class="kw">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Patch</span>, <span class="ident">Error</span><span class="op">></span>; |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">struct</span> <span class="ident">Patch</span> { |
| <span class="ident">hole</span>: <span class="ident">Hole</span>, |
| <span class="ident">entry</span>: <span class="ident">InstPtr</span>, |
| } |
| |
| <span class="doccomment">/// A compiler translates a regular expression AST to a sequence of</span> |
| <span class="doccomment">/// instructions. The sequence of instructions represents an NFA.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Compiler</span> { |
| <span class="ident">insts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">MaybeInst</span><span class="op">></span>, |
| <span class="ident">compiled</span>: <span class="ident">Program</span>, |
| <span class="ident">capture_name_idx</span>: <span class="ident">HashMap</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">usize</span><span class="op">></span>, |
| <span class="ident">num_exprs</span>: <span class="ident">usize</span>, |
| <span class="ident">size_limit</span>: <span class="ident">usize</span>, |
| <span class="ident">suffix_cache</span>: <span class="ident">SuffixCache</span>, |
| <span class="ident">utf8_seqs</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Utf8Sequences</span><span class="op">></span>, |
| <span class="ident">byte_classes</span>: <span class="ident">ByteClassSet</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Compiler</span> { |
| <span class="doccomment">/// Create a new regular expression compiler.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Various options can be set before calling `compile` on an expression.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="self">Self</span> { |
| <span class="ident">Compiler</span> { |
| <span class="ident">insts</span>: <span class="macro">vec</span><span class="macro">!</span>[], |
| <span class="ident">compiled</span>: <span class="ident">Program</span>::<span class="ident">new</span>(), |
| <span class="ident">capture_name_idx</span>: <span class="ident">HashMap</span>::<span class="ident">new</span>(), |
| <span class="ident">num_exprs</span>: <span class="number">0</span>, |
| <span class="ident">size_limit</span>: <span class="number">10</span> <span class="op">*</span> (<span class="number">1</span> <span class="op"><<</span> <span class="number">20</span>), |
| <span class="ident">suffix_cache</span>: <span class="ident">SuffixCache</span>::<span class="ident">new</span>(<span class="number">1000</span>), |
| <span class="ident">utf8_seqs</span>: <span class="prelude-val">Some</span>(<span class="ident">Utf8Sequences</span>::<span class="ident">new</span>(<span class="string">'\x00'</span>, <span class="string">'\x00'</span>)), |
| <span class="ident">byte_classes</span>: <span class="ident">ByteClassSet</span>::<span class="ident">new</span>(), |
| } |
| } |
| |
| <span class="doccomment">/// The size of the resulting program is limited by size_limit. If</span> |
| <span class="doccomment">/// the program approximately exceeds the given size (in bytes), then</span> |
| <span class="doccomment">/// compilation will stop and return an error.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">size_limit</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">size_limit</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">size_limit</span> <span class="op">=</span> <span class="ident">size_limit</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// If bytes is true, then the program is compiled as a byte based</span> |
| <span class="doccomment">/// automaton, which incorporates UTF-8 decoding into the machine. If it's</span> |
| <span class="doccomment">/// false, then the automaton is Unicode scalar value based, e.g., an</span> |
| <span class="doccomment">/// engine utilizing such an automaton is resposible for UTF-8 decoding.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The specific invariant is that when returning a byte based machine,</span> |
| <span class="doccomment">/// the neither the `Char` nor `Ranges` instructions are produced.</span> |
| <span class="doccomment">/// Conversely, when producing a Unicode scalar value machine, the `Bytes`</span> |
| <span class="doccomment">/// instruction is never produced.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that `dfa(true)` implies `bytes(true)`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bytes</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_bytes</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// When disabled, the program compiled may match arbitrary bytes.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When enabled (the default), all compiled programs exclusively match</span> |
| <span class="doccomment">/// valid UTF-8 bytes.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">only_utf8</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">only_utf8</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// When set, the machine returned is suitable for use in the DFA matching</span> |
| <span class="doccomment">/// engine.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// In particular, this ensures that if the regex is not anchored in the</span> |
| <span class="doccomment">/// beginning, then a preceding `.*?` is included in the program. (The NFA</span> |
| <span class="doccomment">/// based engines handle the preceding `.*?` explicitly, which is difficult</span> |
| <span class="doccomment">/// or impossible in the DFA engine.)</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dfa</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_dfa</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// When set, the machine returned is suitable for matching text in</span> |
| <span class="doccomment">/// reverse. In particular, all concatenations are flipped.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reverse</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Compile a regular expression given its AST.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The compiler is guaranteed to succeed unless the program exceeds the</span> |
| <span class="doccomment">/// specified size limit. If the size limit is exceeded, then compilation</span> |
| <span class="doccomment">/// stops and returns an error.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compile</span>( |
| <span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">exprs</span>: <span class="kw-2">&</span>[<span class="ident">Expr</span>], |
| ) <span class="op">-></span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Program</span>, <span class="ident">Error</span><span class="op">></span> { |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">1</span>); |
| <span class="self">self</span>.<span class="ident">num_exprs</span> <span class="op">=</span> <span class="ident">exprs</span>.<span class="ident">len</span>(); |
| <span class="kw">if</span> <span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> { |
| <span class="self">self</span>.<span class="ident">compile_one</span>(<span class="kw-2">&</span><span class="ident">exprs</span>[<span class="number">0</span>]) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">compile_many</span>(<span class="ident">exprs</span>) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">compile_one</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>) <span class="op">-></span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Program</span>, <span class="ident">Error</span><span class="op">></span> { |
| <span class="comment">// If we're compiling a forward DFA and we aren't anchored, then</span> |
| <span class="comment">// add a `.*?` before the first capture group.</span> |
| <span class="comment">// Other matching engines handle this by baking the logic into the</span> |
| <span class="comment">// matching engine itself.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dotstar_patch</span> <span class="op">=</span> <span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="prelude-val">None</span>, <span class="ident">entry</span>: <span class="number">0</span> }; |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_anchored_start</span> <span class="op">=</span> <span class="ident">expr</span>.<span class="ident">is_anchored_start</span>(); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_anchored_end</span> <span class="op">=</span> <span class="ident">expr</span>.<span class="ident">is_anchored_end</span>(); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">needs_dotstar</span>() { |
| <span class="ident">dotstar_patch</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_dotstar</span>()); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">dotstar_patch</span>.<span class="ident">entry</span>; |
| } |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">captures</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="prelude-val">None</span>]; |
| <span class="kw">let</span> <span class="ident">patch</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_capture</span>(<span class="number">0</span>, <span class="ident">expr</span>)); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">needs_dotstar</span>() { |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">dotstar_patch</span>.<span class="ident">hole</span>, <span class="ident">patch</span>.<span class="ident">entry</span>); |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">patch</span>.<span class="ident">entry</span>; |
| } |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">patch</span>.<span class="ident">hole</span>); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">matches</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>()]; |
| <span class="self">self</span>.<span class="ident">push_compiled</span>(<span class="ident">Inst</span>::<span class="ident">Match</span>(<span class="number">0</span>)); |
| <span class="self">self</span>.<span class="ident">compile_finish</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">compile_many</span>( |
| <span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">exprs</span>: <span class="kw-2">&</span>[<span class="ident">Expr</span>], |
| ) <span class="op">-></span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Program</span>, <span class="ident">Error</span><span class="op">></span> { |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">1</span>); |
| |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_anchored_start</span> <span class="op">=</span> |
| <span class="ident">exprs</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">is_anchored_start</span>()); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_anchored_end</span> <span class="op">=</span> |
| <span class="ident">exprs</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">is_anchored_end</span>()); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dotstar_patch</span> <span class="op">=</span> <span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="prelude-val">None</span>, <span class="ident">entry</span>: <span class="number">0</span> }; |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">needs_dotstar</span>() { |
| <span class="ident">dotstar_patch</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_dotstar</span>()); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">dotstar_patch</span>.<span class="ident">entry</span>; |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">start</span> <span class="op">=</span> <span class="number">0</span>; <span class="comment">// first instruction is always split</span> |
| } |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">dotstar_patch</span>.<span class="ident">hole</span>); |
| |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">expr</span>) <span class="kw">in</span> <span class="ident">exprs</span>[<span class="number">0</span>..<span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>].<span class="ident">iter</span>().<span class="ident">enumerate</span>() { |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_capture</span>(<span class="number">0</span>, <span class="ident">expr</span>)); |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">hole</span>); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">matches</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>()); |
| <span class="self">self</span>.<span class="ident">push_compiled</span>(<span class="ident">Inst</span>::<span class="ident">Match</span>(<span class="ident">i</span>)); |
| |
| <span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry</span>), <span class="prelude-val">Some</span>(<span class="ident">next</span>)); |
| } |
| <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>; |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, .. } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_capture</span>(<span class="number">0</span>, <span class="kw-2">&</span><span class="ident">exprs</span>[<span class="ident">i</span>])); |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">hole</span>); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">matches</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>()); |
| <span class="self">self</span>.<span class="ident">push_compiled</span>(<span class="ident">Inst</span>::<span class="ident">Match</span>(<span class="ident">i</span>)); |
| <span class="self">self</span>.<span class="ident">compile_finish</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">compile_finish</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Program</span>, <span class="ident">Error</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">insts</span> <span class="op">=</span> |
| <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">inst</span><span class="op">|</span> <span class="ident">inst</span>.<span class="ident">unwrap</span>()).<span class="ident">collect</span>(); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">byte_classes</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">byte_classes</span>(); |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">capture_name_idx</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">capture_name_idx</span>); |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">compiled</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">use</span> <span class="ident">prog</span>; |
| <span class="kw">use</span> <span class="ident">syntax</span>::<span class="ident">Expr</span>::<span class="kw-2">*</span>; |
| |
| <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">check_size</span>()); |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">expr</span> { |
| <span class="ident">Empty</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="prelude-val">None</span>, <span class="ident">entry</span>: <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>() }), |
| <span class="ident">Literal</span> { <span class="kw-2">ref</span> <span class="ident">chars</span>, <span class="ident">casei</span> } <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_literal</span>(<span class="ident">chars</span>, <span class="ident">casei</span>), |
| <span class="ident">LiteralBytes</span> { <span class="kw-2">ref</span> <span class="ident">bytes</span>, <span class="ident">casei</span> } <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_bytes</span>(<span class="ident">bytes</span>, <span class="ident">casei</span>), |
| <span class="ident">AnyChar</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_class</span>(<span class="kw-2">&</span>[<span class="ident">ClassRange</span> { |
| <span class="ident">start</span>: <span class="string">'\x00'</span>, |
| <span class="ident">end</span>: <span class="string">'\u{10ffff}'</span>, |
| }]), |
| <span class="ident">AnyCharNoNL</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_class</span>(<span class="kw-2">&</span>[ |
| <span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="string">'\x00'</span>, <span class="ident">end</span>: <span class="string">'\x09'</span> }, |
| <span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="string">'\x0b'</span>, <span class="ident">end</span>: <span class="string">'\u{10ffff}'</span> }, |
| ]) |
| } |
| <span class="ident">AnyByte</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_class_bytes</span>(<span class="kw-2">&</span>[<span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="number">0</span>, <span class="ident">end</span>: <span class="number">0xFF</span> }]) |
| } |
| <span class="ident">AnyByteNoNL</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_class_bytes</span>(<span class="kw-2">&</span>[ |
| <span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="number">0</span>, <span class="ident">end</span>: <span class="number">0x9</span> }, |
| <span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="number">0xB</span>, <span class="ident">end</span>: <span class="number">0xFF</span> }, |
| ]) |
| } |
| <span class="ident">Class</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_class</span>(<span class="ident">cls</span>) |
| } |
| <span class="ident">ClassBytes</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_class_bytes</span>(<span class="ident">cls</span>) |
| } |
| <span class="ident">StartLine</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">EndLine</span>) |
| } |
| <span class="ident">StartLine</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">StartLine</span>) |
| } |
| <span class="ident">EndLine</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">StartLine</span>) |
| } |
| <span class="ident">EndLine</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="string">b'\n'</span>, <span class="string">b'\n'</span>); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">EndLine</span>) |
| } |
| <span class="ident">StartText</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">EndText</span>) |
| } |
| <span class="ident">StartText</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">StartText</span>) |
| } |
| <span class="ident">EndText</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">StartText</span>) |
| } |
| <span class="ident">EndText</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">EndText</span>) |
| } |
| <span class="ident">WordBoundary</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">has_unicode_word_boundary</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_word_boundary</span>(); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">WordBoundary</span>) |
| } |
| <span class="ident">NotWordBoundary</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">has_unicode_word_boundary</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_word_boundary</span>(); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">NotWordBoundary</span>) |
| } |
| <span class="ident">WordBoundaryAscii</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_word_boundary</span>(); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">WordBoundaryAscii</span>) |
| } |
| <span class="ident">NotWordBoundaryAscii</span> <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_word_boundary</span>(); |
| <span class="self">self</span>.<span class="ident">c_empty_look</span>(<span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="ident">NotWordBoundaryAscii</span>) |
| } |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">i</span>: <span class="prelude-val">None</span>, <span class="ident">name</span>: <span class="prelude-val">None</span> } <span class="op">=></span> <span class="self">self</span>.<span class="ident">c</span>(<span class="ident">e</span>), |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">i</span>, <span class="kw-2">ref</span> <span class="ident">name</span> } <span class="op">=></span> { |
| <span class="comment">// it's impossible to have a named capture without an index</span> |
| <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">i</span>.<span class="ident">expect</span>(<span class="string">"capture index"</span>); |
| <span class="kw">if</span> <span class="ident">i</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">captures</span>.<span class="ident">len</span>() { |
| <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">captures</span>.<span class="ident">push</span>(<span class="ident">name</span>.<span class="ident">clone</span>()); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">name</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">name</span> { |
| <span class="self">self</span>.<span class="ident">capture_name_idx</span>.<span class="ident">insert</span>(<span class="ident">name</span>.<span class="ident">to_owned</span>(), <span class="ident">i</span>); |
| } |
| } |
| <span class="self">self</span>.<span class="ident">c_capture</span>(<span class="number">2</span> <span class="op">*</span> <span class="ident">i</span>, <span class="ident">e</span>) |
| } |
| <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> { |
| <span class="self">self</span>.<span class="ident">c_concat</span>(<span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">rev</span>()) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">c_concat</span>(<span class="ident">es</span>) |
| } |
| } |
| <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_alternate</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">es</span>), |
| <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>, <span class="ident">greedy</span> } <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_repeat</span>(<span class="ident">e</span>, <span class="ident">r</span>, <span class="ident">greedy</span>), |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_capture</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">first_slot</span>: <span class="ident">usize</span>, <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_exprs</span> <span class="op">></span> <span class="number">1</span> <span class="op">||</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_dfa</span> { |
| <span class="comment">// Don't ever compile Save instructions for regex sets because</span> |
| <span class="comment">// they are never used. They are also never used in DFA programs</span> |
| <span class="comment">// because DFAs can't handle captures.</span> |
| <span class="self">self</span>.<span class="ident">c</span>(<span class="ident">expr</span>) |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Save</span> { <span class="ident">slot</span>: <span class="ident">first_slot</span> }); |
| <span class="kw">let</span> <span class="ident">patch</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">expr</span>)); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole</span>, <span class="ident">patch</span>.<span class="ident">entry</span>); |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">patch</span>.<span class="ident">hole</span>); |
| <span class="kw">let</span> <span class="ident">hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Save</span> { <span class="ident">slot</span>: <span class="ident">first_slot</span> <span class="op">+</span> <span class="number">1</span> }); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole</span>, <span class="ident">entry</span>: <span class="ident">entry</span> }) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_dotstar</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="prelude-val">Ok</span>(<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">only_utf8</span>() { |
| <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="kw-2">&</span><span class="ident">Expr</span>::<span class="ident">Repeat</span> { |
| <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">Expr</span>::<span class="ident">AnyByte</span>), |
| <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>, |
| <span class="ident">greedy</span>: <span class="bool-val">false</span>, |
| })) |
| } <span class="kw">else</span> { |
| <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="kw-2">&</span><span class="ident">Expr</span>::<span class="ident">Repeat</span> { |
| <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">Expr</span>::<span class="ident">AnyChar</span>), |
| <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>, |
| <span class="ident">greedy</span>: <span class="bool-val">false</span>, |
| })) |
| }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_literal</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">chars</span>: <span class="kw-2">&</span>[<span class="ident">char</span>], <span class="ident">casei</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">chars</span>.<span class="ident">is_empty</span>()); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="kw-2">&</span><span class="ident">char</span><span class="op">>></span> <span class="op">=</span> |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> { |
| <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">chars</span>.<span class="ident">iter</span>().<span class="ident">rev</span>()) |
| } <span class="kw">else</span> { |
| <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">chars</span>.<span class="ident">iter</span>()) |
| }; |
| <span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">chars</span>.<span class="ident">next</span>().<span class="ident">expect</span>(<span class="string">"non-empty literal"</span>); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="kw-2">mut</span> <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_char</span>(<span class="ident">first</span>, <span class="ident">casei</span>)); |
| <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">c</span> <span class="kw">in</span> <span class="ident">chars</span> { |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_char</span>(<span class="ident">c</span>, <span class="ident">casei</span>)); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole</span>, <span class="ident">p</span>.<span class="ident">entry</span>); |
| <span class="ident">hole</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">hole</span>; |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole</span>, <span class="ident">entry</span>: <span class="ident">entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>, <span class="ident">casei</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">if</span> <span class="ident">casei</span> { |
| <span class="self">self</span>.<span class="ident">c_class</span>(<span class="kw-2">&</span><span class="ident">CharClass</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[ |
| <span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="ident">c</span>, <span class="ident">end</span>: <span class="ident">c</span> }, |
| ]).<span class="ident">case_fold</span>()) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">c_class</span>(<span class="kw-2">&</span>[<span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="ident">c</span>, <span class="ident">end</span>: <span class="ident">c</span> }]) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_class</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ranges</span>: <span class="kw-2">&</span>[<span class="ident">ClassRange</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">ranges</span>.<span class="ident">is_empty</span>()); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">uses_bytes</span>() { |
| <span class="ident">CompileClass</span> { |
| <span class="ident">c</span>: <span class="self">self</span>, |
| <span class="ident">ranges</span>: <span class="ident">ranges</span>, |
| }.<span class="ident">compile</span>() |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">ranges</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">char</span>, <span class="ident">char</span>)<span class="op">></span> <span class="op">=</span> |
| <span class="ident">ranges</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> (<span class="ident">r</span>.<span class="ident">start</span>, <span class="ident">r</span>.<span class="ident">end</span>)).<span class="ident">collect</span>(); |
| <span class="kw">let</span> <span class="ident">hole</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">ranges</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> <span class="op">&&</span> <span class="ident">ranges</span>[<span class="number">0</span>].<span class="number">0</span> <span class="op">==</span> <span class="ident">ranges</span>[<span class="number">0</span>].<span class="number">1</span> { |
| <span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Char</span> { <span class="ident">c</span>: <span class="ident">ranges</span>[<span class="number">0</span>].<span class="number">0</span> }) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Ranges</span> { <span class="ident">ranges</span>: <span class="ident">ranges</span> }) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole</span>, <span class="ident">entry</span>: <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> }) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_bytes</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">casei</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">bytes</span>.<span class="ident">is_empty</span>()); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="kw-2">&</span><span class="ident">u8</span><span class="op">>></span> <span class="op">=</span> |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> { |
| <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">bytes</span>.<span class="ident">iter</span>().<span class="ident">rev</span>()) |
| } <span class="kw">else</span> { |
| <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">bytes</span>.<span class="ident">iter</span>()) |
| }; |
| <span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">bytes</span>.<span class="ident">next</span>().<span class="ident">expect</span>(<span class="string">"non-empty literal"</span>); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="kw-2">mut</span> <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_byte</span>(<span class="ident">first</span>, <span class="ident">casei</span>)); |
| <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">bytes</span> { |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_byte</span>(<span class="ident">b</span>, <span class="ident">casei</span>)); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole</span>, <span class="ident">p</span>.<span class="ident">entry</span>); |
| <span class="ident">hole</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">hole</span>; |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole</span>, <span class="ident">entry</span>: <span class="ident">entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_byte</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">b</span>: <span class="ident">u8</span>, <span class="ident">casei</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">if</span> <span class="ident">casei</span> { |
| <span class="self">self</span>.<span class="ident">c_class_bytes</span>(<span class="kw-2">&</span><span class="ident">ByteClass</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[ |
| <span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="ident">b</span>, <span class="ident">end</span>: <span class="ident">b</span> }, |
| ]).<span class="ident">case_fold</span>()) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">c_class_bytes</span>(<span class="kw-2">&</span>[<span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="ident">b</span>, <span class="ident">end</span>: <span class="ident">b</span> }]) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_class_bytes</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ranges</span>: <span class="kw-2">&</span>[<span class="ident">ByteRange</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">ranges</span>.<span class="ident">is_empty</span>()); |
| |
| <span class="kw">let</span> <span class="ident">first_split_entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">holes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev_hole</span> <span class="op">=</span> <span class="ident">Hole</span>::<span class="prelude-val">None</span>; |
| <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">ranges</span>[<span class="number">0</span>..<span class="ident">ranges</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>] { |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">prev_hole</span>); |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="ident">r</span>.<span class="ident">start</span>, <span class="ident">r</span>.<span class="ident">end</span>); |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Bytes</span> { |
| <span class="ident">start</span>: <span class="ident">r</span>.<span class="ident">start</span>, <span class="ident">end</span>: <span class="ident">r</span>.<span class="ident">end</span>, |
| })); |
| <span class="ident">prev_hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">next</span>), <span class="prelude-val">None</span>); |
| } |
| <span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">ranges</span>[<span class="ident">ranges</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>]; |
| <span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="ident">r</span>.<span class="ident">start</span>, <span class="ident">r</span>.<span class="ident">end</span>); |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Bytes</span> { |
| <span class="ident">start</span>: <span class="ident">r</span>.<span class="ident">start</span>, <span class="ident">end</span>: <span class="ident">r</span>.<span class="ident">end</span>, |
| })); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">prev_hole</span>, <span class="ident">next</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>), <span class="ident">entry</span>: <span class="ident">first_split_entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_empty_look</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">look</span>: <span class="ident">EmptyLook</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> <span class="ident">hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">EmptyLook</span> { <span class="ident">look</span>: <span class="ident">look</span> }); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole</span>, <span class="ident">entry</span>: <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_concat</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">exprs</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> |
| <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Expr</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">exprs</span> <span class="op">=</span> <span class="ident">exprs</span>.<span class="ident">into_iter</span>(); |
| <span class="kw">let</span> <span class="ident">first</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">exprs</span>.<span class="ident">next</span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">expr</span>) <span class="op">=></span> <span class="ident">expr</span>, |
| <span class="prelude-val">None</span> <span class="op">=></span> { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="prelude-val">None</span>, <span class="ident">entry</span>: <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>() }) |
| } |
| }; |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="kw-2">mut</span> <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">first</span>)); |
| <span class="kw">for</span> <span class="ident">e</span> <span class="kw">in</span> <span class="ident">exprs</span> { |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">e</span>)); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole</span>, <span class="ident">p</span>.<span class="ident">entry</span>); |
| <span class="ident">hole</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">hole</span>; |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole</span>, <span class="ident">entry</span>: <span class="ident">entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_alternate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">exprs</span>: <span class="kw-2">&</span>[<span class="ident">Expr</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="macro">debug_assert</span><span class="macro">!</span>( |
| <span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">>=</span> <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> <span class="ident">first_split_entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| |
| <span class="comment">// Save up all of the holes from each alternate. They will all get</span> |
| <span class="comment">// patched to point to the same location.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">holes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[]; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev_hole</span> <span class="op">=</span> <span class="ident">Hole</span>::<span class="prelude-val">None</span>; |
| <span class="kw">for</span> <span class="ident">e</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">exprs</span>[<span class="number">0</span>..<span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>] { |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">prev_hole</span>); |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">e</span>)); |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="ident">hole</span>); |
| <span class="ident">prev_hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry</span>), <span class="prelude-val">None</span>); |
| } |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="kw-2">&</span><span class="ident">exprs</span>[<span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>])); |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="ident">hole</span>); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">prev_hole</span>, <span class="ident">entry</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>), <span class="ident">entry</span>: <span class="ident">first_split_entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_repeat</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>, |
| <span class="ident">kind</span>: <span class="ident">Repeater</span>, |
| <span class="ident">greedy</span>: <span class="ident">bool</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">match</span> <span class="ident">kind</span> { |
| <span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_repeat_zero_or_one</span>(<span class="ident">expr</span>, <span class="ident">greedy</span>), |
| <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_repeat_zero_or_more</span>(<span class="ident">expr</span>, <span class="ident">greedy</span>), |
| <span class="ident">Repeater</span>::<span class="ident">OneOrMore</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">c_repeat_one_or_more</span>(<span class="ident">expr</span>, <span class="ident">greedy</span>), |
| <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>, <span class="ident">max</span>: <span class="prelude-val">None</span> } <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_repeat_range_min_or_more</span>(<span class="ident">expr</span>, <span class="ident">greedy</span>, <span class="ident">min</span>) |
| } |
| <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="ident">max</span>) } <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">c_repeat_range</span>(<span class="ident">expr</span>, <span class="ident">greedy</span>, <span class="ident">min</span>, <span class="ident">max</span>) |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_repeat_zero_or_one</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>, |
| <span class="ident">greedy</span>: <span class="ident">bool</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> <span class="ident">split_entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole_rep</span>, <span class="ident">entry</span>: <span class="ident">entry_rep</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">expr</span>)); |
| |
| <span class="kw">let</span> <span class="ident">split_hole</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">greedy</span> { |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry_rep</span>), <span class="prelude-val">None</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">entry_rep</span>)) |
| }; |
| <span class="kw">let</span> <span class="ident">holes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">hole_rep</span>, <span class="ident">split_hole</span>]; |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>), <span class="ident">entry</span>: <span class="ident">split_entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_repeat_zero_or_more</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>, |
| <span class="ident">greedy</span>: <span class="ident">bool</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> <span class="ident">split_entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole_rep</span>, <span class="ident">entry</span>: <span class="ident">entry_rep</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">expr</span>)); |
| |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole_rep</span>, <span class="ident">split_entry</span>); |
| <span class="kw">let</span> <span class="ident">split_hole</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">greedy</span> { |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry_rep</span>), <span class="prelude-val">None</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">entry_rep</span>)) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">split_hole</span>, <span class="ident">entry</span>: <span class="ident">split_entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_repeat_one_or_more</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>, |
| <span class="ident">greedy</span>: <span class="ident">bool</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">hole_rep</span>, <span class="ident">entry</span>: <span class="ident">entry_rep</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">expr</span>)); |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">hole_rep</span>); |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| |
| <span class="kw">let</span> <span class="ident">split_hole</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">greedy</span> { |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry_rep</span>), <span class="prelude-val">None</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">entry_rep</span>)) |
| }; |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">split_hole</span>, <span class="ident">entry</span>: <span class="ident">entry_rep</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_repeat_range_min_or_more</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>, |
| <span class="ident">greedy</span>: <span class="ident">bool</span>, |
| <span class="ident">min</span>: <span class="ident">u32</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> <span class="ident">min</span> <span class="op">=</span> <span class="ident">u32_to_usize</span>(<span class="ident">min</span>); |
| <span class="kw">let</span> <span class="ident">patch_concat</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_concat</span>(<span class="ident">iter</span>::<span class="ident">repeat</span>(<span class="ident">expr</span>).<span class="ident">take</span>(<span class="ident">min</span>))); |
| <span class="kw">let</span> <span class="ident">patch_rep</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_repeat_zero_or_more</span>(<span class="ident">expr</span>, <span class="ident">greedy</span>)); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">patch_concat</span>.<span class="ident">hole</span>, <span class="ident">patch_rep</span>.<span class="ident">entry</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">patch_rep</span>.<span class="ident">hole</span>, <span class="ident">entry</span>: <span class="ident">patch_concat</span>.<span class="ident">entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_repeat_range</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">expr</span>: <span class="kw-2">&</span><span class="ident">Expr</span>, |
| <span class="ident">greedy</span>: <span class="ident">bool</span>, |
| <span class="ident">min</span>: <span class="ident">u32</span>, |
| <span class="ident">max</span>: <span class="ident">u32</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> (<span class="ident">min</span>, <span class="ident">max</span>) <span class="op">=</span> (<span class="ident">u32_to_usize</span>(<span class="ident">min</span>), <span class="ident">u32_to_usize</span>(<span class="ident">max</span>)); |
| <span class="kw">let</span> <span class="ident">patch_concat</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_concat</span>(<span class="ident">iter</span>::<span class="ident">repeat</span>(<span class="ident">expr</span>).<span class="ident">take</span>(<span class="ident">min</span>))); |
| <span class="kw">let</span> <span class="ident">initial_entry</span> <span class="op">=</span> <span class="ident">patch_concat</span>.<span class="ident">entry</span>; |
| <span class="kw">if</span> <span class="ident">min</span> <span class="op">==</span> <span class="ident">max</span> { |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">patch_concat</span>); |
| } |
| <span class="comment">// It is much simpler to compile, e.g., `a{2,5}` as:</span> |
| <span class="comment">//</span> |
| <span class="comment">// aaa?a?a?</span> |
| <span class="comment">//</span> |
| <span class="comment">// But you end up with a sequence of instructions like this:</span> |
| <span class="comment">//</span> |
| <span class="comment">// 0: 'a'</span> |
| <span class="comment">// 1: 'a',</span> |
| <span class="comment">// 2: split(3, 4)</span> |
| <span class="comment">// 3: 'a'</span> |
| <span class="comment">// 4: split(5, 6)</span> |
| <span class="comment">// 5: 'a'</span> |
| <span class="comment">// 6: split(7, 8)</span> |
| <span class="comment">// 7: 'a'</span> |
| <span class="comment">// 8: MATCH</span> |
| <span class="comment">//</span> |
| <span class="comment">// This is *incredibly* inefficient because the splits end</span> |
| <span class="comment">// up forming a chain, which has to be resolved everything a</span> |
| <span class="comment">// transition is followed.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">holes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev_hole</span> <span class="op">=</span> <span class="ident">patch_concat</span>.<span class="ident">hole</span>; |
| <span class="kw">for</span> _ <span class="kw">in</span> <span class="ident">min</span>..<span class="ident">max</span> { |
| <span class="self">self</span>.<span class="ident">fill_to_next</span>(<span class="ident">prev_hole</span>); |
| <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c</span>(<span class="ident">expr</span>)); |
| <span class="ident">prev_hole</span> <span class="op">=</span> <span class="ident">hole</span>; |
| <span class="kw">if</span> <span class="ident">greedy</span> { |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry</span>), <span class="prelude-val">None</span>)); |
| } <span class="kw">else</span> { |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">split</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">entry</span>))); |
| } |
| } |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="ident">prev_hole</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>), <span class="ident">entry</span>: <span class="ident">initial_entry</span> }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">hole</span>: <span class="ident">Hole</span>, <span class="ident">goto</span>: <span class="ident">InstPtr</span>) { |
| <span class="kw">match</span> <span class="ident">hole</span> { |
| <span class="ident">Hole</span>::<span class="prelude-val">None</span> <span class="op">=></span> {} |
| <span class="ident">Hole</span>::<span class="ident">One</span>(<span class="ident">pc</span>) <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">insts</span>[<span class="ident">pc</span>].<span class="ident">fill</span>(<span class="ident">goto</span>); |
| } |
| <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>) <span class="op">=></span> { |
| <span class="kw">for</span> <span class="ident">hole</span> <span class="kw">in</span> <span class="ident">holes</span> { |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole</span>, <span class="ident">goto</span>); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">fill_to_next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">hole</span>: <span class="ident">Hole</span>) { |
| <span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="self">self</span>.<span class="ident">fill</span>(<span class="ident">hole</span>, <span class="ident">next</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">fill_split</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">hole</span>: <span class="ident">Hole</span>, |
| <span class="ident">goto1</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InstPtr</span><span class="op">></span>, |
| <span class="ident">goto2</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InstPtr</span><span class="op">></span>, |
| ) <span class="op">-></span> <span class="ident">Hole</span> { |
| <span class="kw">match</span> <span class="ident">hole</span> { |
| <span class="ident">Hole</span>::<span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">Hole</span>::<span class="prelude-val">None</span>, |
| <span class="ident">Hole</span>::<span class="ident">One</span>(<span class="ident">pc</span>) <span class="op">=></span> { |
| <span class="kw">match</span> (<span class="ident">goto1</span>, <span class="ident">goto2</span>) { |
| (<span class="prelude-val">Some</span>(<span class="ident">goto1</span>), <span class="prelude-val">Some</span>(<span class="ident">goto2</span>)) <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">insts</span>[<span class="ident">pc</span>].<span class="ident">fill_split</span>(<span class="ident">goto1</span>, <span class="ident">goto2</span>); |
| <span class="ident">Hole</span>::<span class="prelude-val">None</span> |
| } |
| (<span class="prelude-val">Some</span>(<span class="ident">goto1</span>), <span class="prelude-val">None</span>) <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">insts</span>[<span class="ident">pc</span>].<span class="ident">half_fill_split_goto1</span>(<span class="ident">goto1</span>); |
| <span class="ident">Hole</span>::<span class="ident">One</span>(<span class="ident">pc</span>) |
| } |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">goto2</span>)) <span class="op">=></span> { |
| <span class="self">self</span>.<span class="ident">insts</span>[<span class="ident">pc</span>].<span class="ident">half_fill_split_goto2</span>(<span class="ident">goto2</span>); |
| <span class="ident">Hole</span>::<span class="ident">One</span>(<span class="ident">pc</span>) |
| } |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"at least one of the split \ |
| holes must be filled"</span>), |
| } |
| } |
| <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>) <span class="op">=></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new_holes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[]; |
| <span class="kw">for</span> <span class="ident">hole</span> <span class="kw">in</span> <span class="ident">holes</span> { |
| <span class="ident">new_holes</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">fill_split</span>(<span class="ident">hole</span>, <span class="ident">goto1</span>, <span class="ident">goto2</span>)); |
| } |
| <span class="kw">if</span> <span class="ident">new_holes</span>.<span class="ident">is_empty</span>() { |
| <span class="ident">Hole</span>::<span class="prelude-val">None</span> |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">new_holes</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> { |
| <span class="ident">new_holes</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>() |
| } <span class="kw">else</span> { |
| <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">new_holes</span>) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">push_compiled</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">inst</span>: <span class="ident">Inst</span>) { |
| <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">push</span>(<span class="ident">MaybeInst</span>::<span class="ident">Compiled</span>(<span class="ident">inst</span>)); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">push_hole</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">inst</span>: <span class="ident">InstHole</span>) <span class="op">-></span> <span class="ident">Hole</span> { |
| <span class="kw">let</span> <span class="ident">hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">push</span>(<span class="ident">MaybeInst</span>::<span class="ident">Uncompiled</span>(<span class="ident">inst</span>)); |
| <span class="ident">Hole</span>::<span class="ident">One</span>(<span class="ident">hole</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">push_split_hole</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Hole</span> { |
| <span class="kw">let</span> <span class="ident">hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">push</span>(<span class="ident">MaybeInst</span>::<span class="ident">Split</span>); |
| <span class="ident">Hole</span>::<span class="ident">One</span>(<span class="ident">hole</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">check_size</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">size_of</span>; |
| |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">insts</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Inst</span><span class="op">></span>() <span class="op">></span> <span class="self">self</span>.<span class="ident">size_limit</span> { |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">CompiledTooBig</span>(<span class="self">self</span>.<span class="ident">size_limit</span>)) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">enum</span> <span class="ident">Hole</span> { |
| <span class="prelude-val">None</span>, |
| <span class="ident">One</span>(<span class="ident">InstPtr</span>), |
| <span class="ident">Many</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">Hole</span><span class="op">></span>), |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">enum</span> <span class="ident">MaybeInst</span> { |
| <span class="ident">Compiled</span>(<span class="ident">Inst</span>), |
| <span class="ident">Uncompiled</span>(<span class="ident">InstHole</span>), |
| <span class="ident">Split</span>, |
| <span class="ident">Split1</span>(<span class="ident">InstPtr</span>), |
| <span class="ident">Split2</span>(<span class="ident">InstPtr</span>), |
| } |
| |
| <span class="kw">impl</span> <span class="ident">MaybeInst</span> { |
| <span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">goto</span>: <span class="ident">InstPtr</span>) { |
| <span class="kw">let</span> <span class="ident">filled</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">MaybeInst</span>::<span class="ident">Uncompiled</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> <span class="ident">inst</span>.<span class="ident">fill</span>(<span class="ident">goto</span>), |
| <span class="ident">MaybeInst</span>::<span class="ident">Split1</span>(<span class="ident">goto1</span>) <span class="op">=></span> { |
| <span class="ident">Inst</span>::<span class="ident">Split</span>(<span class="ident">InstSplit</span> { <span class="ident">goto1</span>: <span class="ident">goto1</span>, <span class="ident">goto2</span>: <span class="ident">goto</span> }) |
| } |
| <span class="ident">MaybeInst</span>::<span class="ident">Split2</span>(<span class="ident">goto2</span>) <span class="op">=></span> { |
| <span class="ident">Inst</span>::<span class="ident">Split</span>(<span class="ident">InstSplit</span> { <span class="ident">goto1</span>: <span class="ident">goto</span>, <span class="ident">goto2</span>: <span class="ident">goto2</span> }) |
| } |
| _ <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</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> <span class="op">=</span> <span class="ident">MaybeInst</span>::<span class="ident">Compiled</span>(<span class="ident">filled</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">fill_split</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">goto1</span>: <span class="ident">InstPtr</span>, <span class="ident">goto2</span>: <span class="ident">InstPtr</span>) { |
| <span class="kw">let</span> <span class="ident">filled</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">MaybeInst</span>::<span class="ident">Split</span> <span class="op">=></span> { |
| <span class="ident">Inst</span>::<span class="ident">Split</span>(<span class="ident">InstSplit</span> { <span class="ident">goto1</span>: <span class="ident">goto1</span>, <span class="ident">goto2</span>: <span class="ident">goto2</span> }) |
| } |
| _ <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</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> <span class="op">=</span> <span class="ident">MaybeInst</span>::<span class="ident">Compiled</span>(<span class="ident">filled</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">half_fill_split_goto1</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">goto1</span>: <span class="ident">InstPtr</span>) { |
| <span class="kw">let</span> <span class="ident">half_filled</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">MaybeInst</span>::<span class="ident">Split</span> <span class="op">=></span> <span class="ident">goto1</span>, |
| _ <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</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> <span class="op">=</span> <span class="ident">MaybeInst</span>::<span class="ident">Split1</span>(<span class="ident">half_filled</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">half_fill_split_goto2</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">goto2</span>: <span class="ident">InstPtr</span>) { |
| <span class="kw">let</span> <span class="ident">half_filled</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">MaybeInst</span>::<span class="ident">Split</span> <span class="op">=></span> <span class="ident">goto2</span>, |
| _ <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</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> <span class="op">=</span> <span class="ident">MaybeInst</span>::<span class="ident">Split2</span>(<span class="ident">half_filled</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">unwrap</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Inst</span> { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">MaybeInst</span>::<span class="ident">Compiled</span>(<span class="ident">inst</span>) <span class="op">=></span> <span class="ident">inst</span>, |
| _ <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</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">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">enum</span> <span class="ident">InstHole</span> { |
| <span class="ident">Save</span> { <span class="ident">slot</span>: <span class="ident">usize</span> }, |
| <span class="ident">EmptyLook</span> { <span class="ident">look</span>: <span class="ident">EmptyLook</span> }, |
| <span class="ident">Char</span> { <span class="ident">c</span>: <span class="ident">char</span> }, |
| <span class="ident">Ranges</span> { <span class="ident">ranges</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">char</span>, <span class="ident">char</span>)<span class="op">></span> }, |
| <span class="ident">Bytes</span> { <span class="ident">start</span>: <span class="ident">u8</span>, <span class="ident">end</span>: <span class="ident">u8</span> }, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">InstHole</span> { |
| <span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">goto</span>: <span class="ident">InstPtr</span>) <span class="op">-></span> <span class="ident">Inst</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">InstHole</span>::<span class="ident">Save</span> { <span class="ident">slot</span> } <span class="op">=></span> <span class="ident">Inst</span>::<span class="ident">Save</span>(<span class="ident">InstSave</span> { |
| <span class="ident">goto</span>: <span class="ident">goto</span>, |
| <span class="ident">slot</span>: <span class="ident">slot</span>, |
| }), |
| <span class="ident">InstHole</span>::<span class="ident">EmptyLook</span> { <span class="ident">look</span> } <span class="op">=></span> <span class="ident">Inst</span>::<span class="ident">EmptyLook</span>(<span class="ident">InstEmptyLook</span> { |
| <span class="ident">goto</span>: <span class="ident">goto</span>, |
| <span class="ident">look</span>: <span class="ident">look</span>, |
| }), |
| <span class="ident">InstHole</span>::<span class="ident">Char</span> { <span class="ident">c</span> } <span class="op">=></span> <span class="ident">Inst</span>::<span class="ident">Char</span>(<span class="ident">InstChar</span> { |
| <span class="ident">goto</span>: <span class="ident">goto</span>, |
| <span class="ident">c</span>: <span class="ident">c</span>, |
| }), |
| <span class="ident">InstHole</span>::<span class="ident">Ranges</span> { <span class="kw-2">ref</span> <span class="ident">ranges</span> } <span class="op">=></span> <span class="ident">Inst</span>::<span class="ident">Ranges</span>(<span class="ident">InstRanges</span> { |
| <span class="ident">goto</span>: <span class="ident">goto</span>, |
| <span class="ident">ranges</span>: <span class="ident">ranges</span>.<span class="ident">clone</span>(), |
| }), |
| <span class="ident">InstHole</span>::<span class="ident">Bytes</span> { <span class="ident">start</span>, <span class="ident">end</span> } <span class="op">=></span> <span class="ident">Inst</span>::<span class="ident">Bytes</span>(<span class="ident">InstBytes</span> { |
| <span class="ident">goto</span>: <span class="ident">goto</span>, |
| <span class="ident">start</span>: <span class="ident">start</span>, |
| <span class="ident">end</span>: <span class="ident">end</span>, |
| }), |
| } |
| } |
| } |
| |
| <span class="kw">struct</span> <span class="ident">CompileClass</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span><span class="op">></span> { |
| <span class="ident">c</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">Compiler</span>, |
| <span class="ident">ranges</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">ClassRange</span>], |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span><span class="op">></span> <span class="ident">CompileClass</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">compile</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">holes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">initial_entry</span> <span class="op">=</span> <span class="prelude-val">None</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_split</span> <span class="op">=</span> <span class="ident">Hole</span>::<span class="prelude-val">None</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">utf8_seqs</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">utf8_seqs</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>(); |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">suffix_cache</span>.<span class="ident">clear</span>(); |
| |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">ref</span> <span class="ident">range</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() { |
| <span class="kw">let</span> <span class="ident">is_last_range</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">len</span>(); |
| <span class="ident">utf8_seqs</span>.<span class="ident">reset</span>(<span class="ident">range</span>.<span class="ident">start</span>, <span class="ident">range</span>.<span class="ident">end</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">utf8_seqs</span>).<span class="ident">peekable</span>(); |
| <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">utf8_seq</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">it</span>.<span class="ident">next</span>() { |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">break</span>, |
| <span class="prelude-val">Some</span>(<span class="ident">utf8_seq</span>) <span class="op">=></span> <span class="ident">utf8_seq</span>, |
| }; |
| <span class="kw">if</span> <span class="ident">is_last_range</span> <span class="op">&&</span> <span class="ident">it</span>.<span class="ident">peek</span>().<span class="ident">is_none</span>() { |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_utf8_seq</span>(<span class="kw-2">&</span><span class="ident">utf8_seq</span>)); |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="ident">hole</span>); |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">fill</span>(<span class="ident">last_split</span>, <span class="ident">entry</span>); |
| <span class="ident">last_split</span> <span class="op">=</span> <span class="ident">Hole</span>::<span class="prelude-val">None</span>; |
| <span class="kw">if</span> <span class="ident">initial_entry</span>.<span class="ident">is_none</span>() { |
| <span class="ident">initial_entry</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">entry</span>); |
| } |
| } <span class="kw">else</span> { |
| <span class="kw">if</span> <span class="ident">initial_entry</span>.<span class="ident">is_none</span>() { |
| <span class="ident">initial_entry</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">c</span>.<span class="ident">insts</span>.<span class="ident">len</span>()); |
| } |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">fill_to_next</span>(<span class="ident">last_split</span>); |
| <span class="ident">last_split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">push_split_hole</span>(); |
| <span class="kw">let</span> <span class="ident">Patch</span> { <span class="ident">hole</span>, <span class="ident">entry</span> } <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">c_utf8_seq</span>(<span class="kw-2">&</span><span class="ident">utf8_seq</span>)); |
| <span class="ident">holes</span>.<span class="ident">push</span>(<span class="ident">hole</span>); |
| <span class="ident">last_split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">fill_split</span>(<span class="ident">last_split</span>, <span class="prelude-val">Some</span>(<span class="ident">entry</span>), <span class="prelude-val">None</span>); |
| } |
| } |
| } |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">utf8_seqs</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">utf8_seqs</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { |
| <span class="ident">hole</span>: <span class="ident">Hole</span>::<span class="ident">Many</span>(<span class="ident">holes</span>), |
| <span class="ident">entry</span>: <span class="ident">initial_entry</span>.<span class="ident">unwrap</span>(), |
| }) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_utf8_seq</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">seq</span>: <span class="kw-2">&</span><span class="ident">Utf8Sequence</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">compiled</span>.<span class="ident">is_reverse</span> { |
| <span class="self">self</span>.<span class="ident">c_utf8_seq_</span>(<span class="ident">seq</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">c_utf8_seq_</span>(<span class="ident">seq</span>.<span class="ident">into_iter</span>().<span class="ident">rev</span>()) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">c_utf8_seq_</span><span class="op"><</span><span class="lifetime">'r</span>, <span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">seq</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> |
| <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">Utf8Range</span><span class="op">></span> { |
| <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> <span class="ident">from_inst</span> <span class="op">=</span> ::<span class="ident">std</span>::<span class="ident">usize</span>::<span class="ident">MAX</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_hole</span> <span class="op">=</span> <span class="ident">Hole</span>::<span class="prelude-val">None</span>; |
| <span class="kw">for</span> <span class="ident">byte_range</span> <span class="kw">in</span> <span class="ident">seq</span> { |
| <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">SuffixCacheKey</span> { |
| <span class="ident">from_inst</span>: <span class="ident">from_inst</span>, |
| <span class="ident">start</span>: <span class="ident">byte_range</span>.<span class="ident">start</span>, |
| <span class="ident">end</span>: <span class="ident">byte_range</span>.<span class="ident">end</span>, |
| }; |
| { |
| <span class="kw">let</span> <span class="ident">pc</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">insts</span>.<span class="ident">len</span>(); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">cached_pc</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">suffix_cache</span>.<span class="ident">get</span>(<span class="ident">key</span>, <span class="ident">pc</span>) { |
| <span class="ident">from_inst</span> <span class="op">=</span> <span class="ident">cached_pc</span>; |
| <span class="kw">continue</span>; |
| } |
| } |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">byte_classes</span>.<span class="ident">set_range</span>(<span class="ident">byte_range</span>.<span class="ident">start</span>, <span class="ident">byte_range</span>.<span class="ident">end</span>); |
| <span class="kw">if</span> <span class="ident">from_inst</span> <span class="op">==</span> ::<span class="ident">std</span>::<span class="ident">usize</span>::<span class="ident">MAX</span> { |
| <span class="ident">last_hole</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">push_hole</span>(<span class="ident">InstHole</span>::<span class="ident">Bytes</span> { |
| <span class="ident">start</span>: <span class="ident">byte_range</span>.<span class="ident">start</span>, |
| <span class="ident">end</span>: <span class="ident">byte_range</span>.<span class="ident">end</span>, |
| }); |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">push_compiled</span>(<span class="ident">Inst</span>::<span class="ident">Bytes</span>(<span class="ident">InstBytes</span> { |
| <span class="ident">goto</span>: <span class="ident">from_inst</span>, |
| <span class="ident">start</span>: <span class="ident">byte_range</span>.<span class="ident">start</span>, |
| <span class="ident">end</span>: <span class="ident">byte_range</span>.<span class="ident">end</span>, |
| })); |
| } |
| <span class="ident">from_inst</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">insts</span>.<span class="ident">len</span>().<span class="ident">checked_sub</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">from_inst</span> <span class="op"><</span> ::<span class="ident">std</span>::<span class="ident">usize</span>::<span class="ident">MAX</span>); |
| } |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">from_inst</span> <span class="op"><</span> ::<span class="ident">std</span>::<span class="ident">usize</span>::<span class="ident">MAX</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Patch</span> { <span class="ident">hole</span>: <span class="ident">last_hole</span>, <span class="ident">entry</span>: <span class="ident">from_inst</span> }) |
| } |
| } |
| |
| <span class="doccomment">/// SuffixCache is a simple bounded hash map for caching suffix entries in</span> |
| <span class="doccomment">/// UTF-8 automata. For example, consider the Unicode range \u{0}-\u{FFFF}.</span> |
| <span class="doccomment">/// The set of byte ranges looks like this:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [0-7F]</span> |
| <span class="doccomment">/// [C2-DF][80-BF]</span> |
| <span class="doccomment">/// [E0][A0-BF][80-BF]</span> |
| <span class="doccomment">/// [E1-EC][80-BF][80-BF]</span> |
| <span class="doccomment">/// [ED][80-9F][80-BF]</span> |
| <span class="doccomment">/// [EE-EF][80-BF][80-BF]</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Each line above translates to one alternate in the compiled regex program.</span> |
| <span class="doccomment">/// However, all but one of the alternates end in the same suffix, which is</span> |
| <span class="doccomment">/// a waste of an instruction. The suffix cache facilitates reusing them across</span> |
| <span class="doccomment">/// alternates.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that a HashMap could be trivially used for this, but we don't need its</span> |
| <span class="doccomment">/// overhead. Some small bounded space (LRU style) is more than enough.</span> |
| <span class="kw">struct</span> <span class="ident">SuffixCache</span> { |
| <span class="ident">table</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">SuffixCacheEntry</span><span class="op">></span>, |
| <span class="comment">// Every time the cache is cleared, we increment the version number instead</span> |
| <span class="comment">// of actually zeroing memory. Since we store a copy of the current version</span> |
| <span class="comment">// in every element, all we need to do is make sure to invalidate any stale</span> |
| <span class="comment">// entries upon access. This saves quite a bit of time!</span> |
| <span class="ident">version</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Default</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">struct</span> <span class="ident">SuffixCacheEntry</span> { |
| <span class="ident">key</span>: <span class="ident">SuffixCacheKey</span>, |
| <span class="ident">pc</span>: <span class="ident">InstPtr</span>, |
| <span class="ident">version</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Default</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">struct</span> <span class="ident">SuffixCacheKey</span> { |
| <span class="ident">from_inst</span>: <span class="ident">InstPtr</span>, |
| <span class="ident">start</span>: <span class="ident">u8</span>, |
| <span class="ident">end</span>: <span class="ident">u8</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">SuffixCache</span> { |
| <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="ident">SuffixCache</span> { |
| <span class="ident">table</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">SuffixCacheEntry</span>::<span class="ident">default</span>(); <span class="ident">size</span>], |
| <span class="ident">version</span>: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">SuffixCacheKey</span>, <span class="ident">pc</span>: <span class="ident">InstPtr</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InstPtr</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">h</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">hash</span>(<span class="kw-2">&</span><span class="ident">key</span>); |
| <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">table</span>[<span class="ident">h</span>]; |
| <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">key</span> <span class="op">==</span> <span class="ident">key</span> <span class="op">&&</span> <span class="ident">e</span>.<span class="ident">version</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">version</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">e</span>.<span class="ident">pc</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">table</span>[<span class="ident">h</span>] <span class="op">=</span> <span class="ident">SuffixCacheEntry</span> { |
| <span class="ident">key</span>: <span class="ident">key</span>, |
| <span class="ident">pc</span>: <span class="ident">pc</span>, |
| <span class="ident">version</span>: <span class="self">self</span>.<span class="ident">version</span>, |
| }; |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="self">self</span>.<span class="ident">version</span> <span class="op">+=</span> <span class="number">1</span>; |
| } |
| |
| <span class="kw">fn</span> <span class="ident">hash</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">suffix</span>: <span class="kw-2">&</span><span class="ident">SuffixCacheKey</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="comment">// Basic FNV-1a hash as described:</span> |
| <span class="comment">// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function</span> |
| <span class="kw">const</span> <span class="ident">FNV_PRIME</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1099511628211</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">h</span> <span class="op">=</span> <span class="number">14695981039346656037</span>; |
| <span class="ident">h</span> <span class="op">=</span> (<span class="ident">h</span> <span class="op">^</span> (<span class="ident">suffix</span>.<span class="ident">from_inst</span> <span class="kw">as</span> <span class="ident">u64</span>)).<span class="ident">wrapping_mul</span>(<span class="ident">FNV_PRIME</span>); |
| <span class="ident">h</span> <span class="op">=</span> (<span class="ident">h</span> <span class="op">^</span> (<span class="ident">suffix</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u64</span>)).<span class="ident">wrapping_mul</span>(<span class="ident">FNV_PRIME</span>); |
| <span class="ident">h</span> <span class="op">=</span> (<span class="ident">h</span> <span class="op">^</span> (<span class="ident">suffix</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">u64</span>)).<span class="ident">wrapping_mul</span>(<span class="ident">FNV_PRIME</span>); |
| (<span class="ident">h</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">%</span> <span class="self">self</span>.<span class="ident">table</span>.<span class="ident">len</span>() |
| } |
| } |
| |
| <span class="kw">struct</span> <span class="ident">ByteClassSet</span>([<span class="ident">bool</span>; <span class="number">256</span>]); |
| |
| <span class="kw">impl</span> <span class="ident">ByteClassSet</span> { |
| <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="self">Self</span> { |
| <span class="ident">ByteClassSet</span>([<span class="bool-val">false</span>; <span class="number">256</span>]) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">set_range</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">start</span>: <span class="ident">u8</span>, <span class="ident">end</span>: <span class="ident">u8</span>) { |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">start</span> <span class="op"><=</span> <span class="ident">end</span>); |
| <span class="kw">if</span> <span class="ident">start</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="self">self</span>.<span class="number">0</span>[<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="number">1</span>] <span class="op">=</span> <span class="bool-val">true</span>; |
| } |
| <span class="self">self</span>.<span class="number">0</span>[<span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">fn</span> <span class="ident">set_word_boundary</span>(<span class="kw-2">&</span><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</span> |
| <span class="comment">// evaluating \b differently.</span> |
| <span class="kw">let</span> <span class="ident">iswb</span> <span class="op">=</span> <span class="ident">is_word_byte</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b1</span>: <span class="ident">u16</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b2</span>: <span class="ident">u16</span>; |
| <span class="kw">while</span> <span class="ident">b1</span> <span class="op"><=</span> <span class="number">255</span> { |
| <span class="ident">b2</span> <span class="op">=</span> <span class="ident">b1</span> <span class="op">+</span> <span class="number">1</span>; |
| <span class="kw">while</span> <span class="ident">b2</span> <span class="op"><=</span> <span class="number">255</span> <span class="op">&&</span> <span class="ident">iswb</span>(<span class="ident">b1</span> <span class="kw">as</span> <span class="ident">u8</span>) <span class="op">==</span> <span class="ident">iswb</span>(<span class="ident">b2</span> <span class="kw">as</span> <span class="ident">u8</span>) { |
| <span class="ident">b2</span> <span class="op">+=</span> <span class="number">1</span>; |
| } |
| <span class="self">self</span>.<span class="ident">set_range</span>(<span class="ident">b1</span> <span class="kw">as</span> <span class="ident">u8</span>, (<span class="ident">b2</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">u8</span>); |
| <span class="ident">b1</span> <span class="op">=</span> <span class="ident">b2</span>; |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">byte_classes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> { |
| <span class="comment">// N.B. If you're debugging the DFA, it's useful to simply return</span> |
| <span class="comment">// `(0..256).collect()`, which effectively removes the byte classes</span> |
| <span class="comment">// and makes the transitions easier to read.</span> |
| <span class="comment">// (0usize..256).map(|x| x as u8).collect()</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">byte_classes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; <span class="number">256</span>]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">class</span> <span class="op">=</span> <span class="number">0u8</span>; |
| <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">256</span> { |
| <span class="ident">byte_classes</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="ident">class</span>; |
| <span class="kw">if</span> <span class="self">self</span>.<span class="number">0</span>[<span class="ident">i</span>] { |
| <span class="ident">class</span> <span class="op">=</span> <span class="ident">class</span>.<span class="ident">checked_add</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); |
| } |
| } |
| <span class="ident">byte_classes</span> |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">u32_to_usize</span>(<span class="ident">n</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">if</span> (<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="op">></span> (::<span class="ident">std</span>::<span class="ident">usize</span>::<span class="ident">MAX</span> <span class="kw">as</span> <span class="ident">u64</span>) { |
| <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"BUG: {} is too big to be pointer sized"</span>, <span class="ident">n</span>) |
| } |
| <span class="ident">n</span> <span class="kw">as</span> <span class="ident">usize</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">ByteClassSet</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">byte_classes</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">ByteClassSet</span>::<span class="ident">new</span>(); |
| <span class="ident">set</span>.<span class="ident">set_range</span>(<span class="string">b'a'</span>, <span class="string">b'z'</span>); |
| <span class="kw">let</span> <span class="ident">classes</span> <span class="op">=</span> <span class="ident">set</span>.<span class="ident">byte_classes</span>(); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">0</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">2</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="string">b'a'</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="string">b'a'</span> <span class="kw">as</span> <span class="ident">usize</span>], <span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="string">b'm'</span> <span class="kw">as</span> <span class="ident">usize</span>], <span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="string">b'z'</span> <span class="kw">as</span> <span class="ident">usize</span>], <span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="string">b'z'</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="number">1</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">254</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">255</span>], <span class="number">2</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">ByteClassSet</span>::<span class="ident">new</span>(); |
| <span class="ident">set</span>.<span class="ident">set_range</span>(<span class="number">0</span>, <span class="number">2</span>); |
| <span class="ident">set</span>.<span class="ident">set_range</span>(<span class="number">4</span>, <span class="number">6</span>); |
| <span class="kw">let</span> <span class="ident">classes</span> <span class="op">=</span> <span class="ident">set</span>.<span class="ident">byte_classes</span>(); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">0</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">2</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">3</span>], <span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">4</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">5</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">6</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">7</span>], <span class="number">3</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">classes</span>[<span class="number">255</span>], <span class="number">3</span>); |
| } |
| } |
| </pre> |
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