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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| <span id="414">414</span> |
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| <span id="416">416</span> |
| <span id="417">417</span> |
| <span id="418">418</span> |
| <span id="419">419</span> |
| <span id="420">420</span> |
| <span id="421">421</span> |
| <span id="422">422</span> |
| <span id="423">423</span> |
| <span id="424">424</span> |
| <span id="425">425</span> |
| <span id="426">426</span> |
| </pre><pre class="rust "> |
| <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">cmp</span>::<span class="ident">Ordering</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Deref</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</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">input</span>::<span class="ident">Char</span>; |
| <span class="kw">use</span> <span class="ident">literals</span>::<span class="ident">LiteralSearcher</span>; |
| |
| <span class="doccomment">/// InstPtr represents the index of an instruction in a regex program.</span> |
| <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">InstPtr</span> <span class="op">=</span> <span class="ident">usize</span>; |
| |
| <span class="doccomment">/// Program is a sequence of instructions and various facts about thos</span> |
| <span class="doccomment">/// instructions.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Program</span> { |
| <span class="doccomment">/// A sequence of instructions that represents an NFA.</span> |
| <span class="kw">pub</span> <span class="ident">insts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Inst</span><span class="op">></span>, |
| <span class="doccomment">/// Pointers to each Match instruction in the sequence.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is always length 1 unless this program represents a regex set.</span> |
| <span class="kw">pub</span> <span class="ident">matches</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">InstPtr</span><span class="op">></span>, |
| <span class="doccomment">/// The ordered sequence of all capture groups extracted from the AST.</span> |
| <span class="doccomment">/// Unnamed groups are `None`.</span> |
| <span class="kw">pub</span> <span class="ident">captures</span>: <span class="ident">Vec</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>, |
| <span class="doccomment">/// Pointers to all named capture groups into `captures`.</span> |
| <span class="kw">pub</span> <span class="ident">capture_name_idx</span>: <span class="ident">Arc</span><span class="op"><</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="doccomment">/// A pointer to the start instruction. This can vary depending on how</span> |
| <span class="doccomment">/// the program was compiled. For example, programs for use with the DFA</span> |
| <span class="doccomment">/// engine have a `.*?` inserted at the beginning of unanchored regular</span> |
| <span class="doccomment">/// expressions. The actual starting point of the program is after the</span> |
| <span class="doccomment">/// `.*?`.</span> |
| <span class="kw">pub</span> <span class="ident">start</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// A set of equivalence classes for discriminating bytes in the compiled</span> |
| <span class="doccomment">/// program.</span> |
| <span class="kw">pub</span> <span class="ident">byte_classes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, |
| <span class="doccomment">/// When true, this program can only match valid UTF-8.</span> |
| <span class="kw">pub</span> <span class="ident">only_utf8</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// When true, this program uses byte range instructions instead of Unicode</span> |
| <span class="doccomment">/// range instructions.</span> |
| <span class="kw">pub</span> <span class="ident">is_bytes</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// When true, the program is compiled for DFA matching. For example, this</span> |
| <span class="doccomment">/// implies `is_bytes` and also inserts a preceding `.*?` for unanchored</span> |
| <span class="doccomment">/// regexes.</span> |
| <span class="kw">pub</span> <span class="ident">is_dfa</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// When true, the program matches text in reverse (for use only in the</span> |
| <span class="doccomment">/// DFA).</span> |
| <span class="kw">pub</span> <span class="ident">is_reverse</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// Whether the regex must match from the start of the input.</span> |
| <span class="kw">pub</span> <span class="ident">is_anchored_start</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// Whether the regex must match at the end of the input.</span> |
| <span class="kw">pub</span> <span class="ident">is_anchored_end</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// Whether this program contains a Unicode word boundary instruction.</span> |
| <span class="kw">pub</span> <span class="ident">has_unicode_word_boundary</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// A possibly empty machine for very quickly matching prefix literals.</span> |
| <span class="kw">pub</span> <span class="ident">prefixes</span>: <span class="ident">LiteralSearcher</span>, |
| <span class="doccomment">/// A limit on the size of the cache that the DFA is allowed to use while</span> |
| <span class="doccomment">/// matching.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The cache limit specifies approximately how much space we're willing to</span> |
| <span class="doccomment">/// give to the state cache. Once the state cache exceeds the size, it is</span> |
| <span class="doccomment">/// wiped and all states must be re-computed.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that this value does not impact correctness. It can be set to 0</span> |
| <span class="doccomment">/// and the DFA will run just fine. (It will only ever store exactly one</span> |
| <span class="doccomment">/// state in the cache, and will likely run very slowly, but it will work.)</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Also note that this limit is *per thread of execution*. That is,</span> |
| <span class="doccomment">/// if the same regex is used to search text across multiple threads</span> |
| <span class="doccomment">/// simultaneously, then the DFA cache is not shared. Instead, copies are</span> |
| <span class="doccomment">/// made.</span> |
| <span class="kw">pub</span> <span class="ident">dfa_size_limit</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Program</span> { |
| <span class="doccomment">/// Creates an empty instruction sequence. Fields are given default</span> |
| <span class="doccomment">/// values.</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">Program</span> { |
| <span class="ident">insts</span>: <span class="macro">vec</span><span class="macro">!</span>[], |
| <span class="ident">matches</span>: <span class="macro">vec</span><span class="macro">!</span>[], |
| <span class="ident">captures</span>: <span class="macro">vec</span><span class="macro">!</span>[], |
| <span class="ident">capture_name_idx</span>: <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">HashMap</span>::<span class="ident">new</span>()), |
| <span class="ident">start</span>: <span class="number">0</span>, |
| <span class="ident">byte_classes</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; <span class="number">256</span>], |
| <span class="ident">only_utf8</span>: <span class="bool-val">true</span>, |
| <span class="ident">is_bytes</span>: <span class="bool-val">false</span>, |
| <span class="ident">is_dfa</span>: <span class="bool-val">false</span>, |
| <span class="ident">is_reverse</span>: <span class="bool-val">false</span>, |
| <span class="ident">is_anchored_start</span>: <span class="bool-val">false</span>, |
| <span class="ident">is_anchored_end</span>: <span class="bool-val">false</span>, |
| <span class="ident">has_unicode_word_boundary</span>: <span class="bool-val">false</span>, |
| <span class="ident">prefixes</span>: <span class="ident">LiteralSearcher</span>::<span class="ident">empty</span>(), |
| <span class="ident">dfa_size_limit</span>: <span class="number">2</span> <span class="op">*</span> (<span class="number">1</span><span class="op"><<</span><span class="number">20</span>), |
| } |
| } |
| |
| <span class="doccomment">/// If pc is an index to a no-op instruction (like Save), then return the</span> |
| <span class="doccomment">/// next pc that is not a no-op instruction.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">pc</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">loop</span> { |
| <span class="kw">match</span> <span class="self">self</span>[<span class="ident">pc</span>] { |
| <span class="ident">Inst</span>::<span class="ident">Save</span>(<span class="kw-2">ref</span> <span class="ident">i</span>) <span class="op">=></span> <span class="ident">pc</span> <span class="op">=</span> <span class="ident">i</span>.<span class="ident">goto</span>, |
| _ <span class="op">=></span> <span class="kw">return</span> <span class="ident">pc</span>, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Return true if and only if an execution engine at instruction `pc` will</span> |
| <span class="doccomment">/// always lead to a match.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">leads_to_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">pc</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">matches</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">1</span> { |
| <span class="comment">// If we have a regex set, then we have more than one ending</span> |
| <span class="comment">// state, so leading to one of those states is generally</span> |
| <span class="comment">// meaningless.</span> |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| <span class="kw">match</span> <span class="self">self</span>[<span class="self">self</span>.<span class="ident">skip</span>(<span class="ident">pc</span>)] { |
| <span class="ident">Inst</span>::<span class="ident">Match</span>(_) <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if the current configuration demands that an implicit</span> |
| <span class="doccomment">/// `.*?` be prepended to the instruction sequence.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">needs_dotstar</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">is_dfa</span> <span class="op">&&</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_reverse</span> <span class="op">&&</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_anchored_start</span> |
| } |
| |
| <span class="doccomment">/// Returns true if this program uses Byte instructions instead of</span> |
| <span class="doccomment">/// Char/Range instructions.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uses_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">is_bytes</span> <span class="op">||</span> <span class="self">self</span>.<span class="ident">is_dfa</span> |
| } |
| |
| <span class="doccomment">/// Returns true if this program exclusively matches valid UTF-8 bytes.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// That is, if an invalid UTF-8 byte is seen, then no match is possible.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">only_utf8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">only_utf8</span> |
| } |
| |
| <span class="doccomment">/// Return the approximate heap usage of this instruction sequence in</span> |
| <span class="doccomment">/// bytes.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">approximate_size</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="comment">// The only instruction that uses heap space is Ranges (for</span> |
| <span class="comment">// Unicode codepoint programs) to store non-overlapping codepoint</span> |
| <span class="comment">// ranges. To keep this operation constant time, we ignore them.</span> |
| (<span class="self">self</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">mem</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">matches</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">InstPtr</span><span class="op">></span>()) |
| <span class="op">+</span> (<span class="self">self</span>.<span class="ident">captures</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>()) |
| <span class="op">+</span> (<span class="self">self</span>.<span class="ident">capture_name_idx</span>.<span class="ident">len</span>() <span class="op">*</span> |
| (<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>() <span class="op">+</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>())) |
| <span class="op">+</span> (<span class="self">self</span>.<span class="ident">byte_classes</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">u8</span><span class="op">></span>()) |
| <span class="op">+</span> <span class="self">self</span>.<span class="ident">prefixes</span>.<span class="ident">approximate_size</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Program</span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> [<span class="ident">Inst</span>]; |
| |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Target</span> { |
| <span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">insts</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Program</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">Inst</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">fn</span> <span class="ident">with_goto</span>(<span class="ident">cur</span>: <span class="ident">usize</span>, <span class="ident">goto</span>: <span class="ident">usize</span>, <span class="ident">fmtd</span>: <span class="ident">String</span>) <span class="op">-></span> <span class="ident">String</span> { |
| <span class="kw">if</span> <span class="ident">goto</span> <span class="op">==</span> <span class="ident">cur</span> <span class="op">+</span> <span class="number">1</span> { |
| <span class="ident">fmtd</span> |
| } <span class="kw">else</span> { |
| <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{} (goto: {})"</span>, <span class="ident">fmtd</span>, <span class="ident">goto</span>) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">visible_byte</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">String</span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ascii</span>::<span class="ident">escape_default</span>; |
| <span class="kw">let</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">escape_default</span>(<span class="ident">b</span>).<span class="ident">collect</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="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="kw-2">&</span><span class="ident">escaped</span>).<span class="ident">into_owned</span>() |
| } |
| |
| <span class="kw">for</span> (<span class="ident">pc</span>, <span class="ident">inst</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">inst</span> { |
| <span class="ident">Match</span>(<span class="ident">slot</span>) <span class="op">=></span> { |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:04} Match({:?})"</span>, <span class="ident">pc</span>, <span class="ident">slot</span>)) |
| } |
| <span class="ident">Save</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:04} Save({})"</span>, <span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">slot</span>); |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="ident">with_goto</span>(<span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">goto</span>, <span class="ident">s</span>))); |
| } |
| <span class="ident">Split</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> { |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:04} Split({}, {})"</span>, |
| <span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">goto1</span>, <span class="ident">inst</span>.<span class="ident">goto2</span>)); |
| } |
| <span class="ident">EmptyLook</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">inst</span>.<span class="ident">look</span>); |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:04} {}"</span>, |
| <span class="ident">pc</span>, <span class="ident">with_goto</span>(<span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">goto</span>, <span class="ident">s</span>))); |
| } |
| <span class="ident">Char</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">inst</span>.<span class="ident">c</span>); |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:04} {}"</span>, |
| <span class="ident">pc</span>, <span class="ident">with_goto</span>(<span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">goto</span>, <span class="ident">s</span>))); |
| } |
| <span class="ident">Ranges</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">ranges</span> <span class="op">=</span> <span class="ident">inst</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="macro">format</span><span class="macro">!</span>(<span class="string">"{:?}-{:?}"</span>, <span class="ident">r</span>.<span class="number">0</span>, <span class="ident">r</span>.<span class="number">1</span>)) |
| .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>() |
| .<span class="ident">join</span>(<span class="string">", "</span>); |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">ranges</span>); |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:04} {}"</span>, |
| <span class="ident">pc</span>, <span class="ident">with_goto</span>(<span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">goto</span>, <span class="ident">s</span>))); |
| } |
| <span class="ident">Bytes</span>(<span class="kw-2">ref</span> <span class="ident">inst</span>) <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>( |
| <span class="string">"Bytes({}, {})"</span>, |
| <span class="ident">visible_byte</span>(<span class="ident">inst</span>.<span class="ident">start</span>), |
| <span class="ident">visible_byte</span>(<span class="ident">inst</span>.<span class="ident">end</span>)); |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:04} {}"</span>, |
| <span class="ident">pc</span>, <span class="ident">with_goto</span>(<span class="ident">pc</span>, <span class="ident">inst</span>.<span class="ident">goto</span>, <span class="ident">s</span>))); |
| } |
| } |
| <span class="kw">if</span> <span class="ident">pc</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">start</span> { |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">" (start)"</span>)); |
| } |
| <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"\n"</span>)); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Program</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Inst</span>; |
| <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">Inst</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">IntoIter</span> { <span class="self">self</span>.<span class="ident">iter</span>() } |
| } |
| |
| <span class="doccomment">/// Inst is an instruction code in a Regex program.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Regrettably, a regex program either contains Unicode codepoint</span> |
| <span class="doccomment">/// instructions (Char and Ranges) or it contains byte instructions (Bytes).</span> |
| <span class="doccomment">/// A regex program can never contain both.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// It would be worth investigating splitting this into two distinct types and</span> |
| <span class="doccomment">/// then figuring out how to make the matching engines polymorphic over those</span> |
| <span class="doccomment">/// types without sacrificing performance.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Other than the benefit of moving invariants into the type system, another</span> |
| <span class="doccomment">/// benefit is the decreased size. If we remove the `Char` and `Ranges`</span> |
| <span class="doccomment">/// instructions from the `Inst` enum, then its size shrinks from 40 bytes to</span> |
| <span class="doccomment">/// 24 bytes. (This is because of the removal of a `Vec` in the `Ranges`</span> |
| <span class="doccomment">/// variant.) Given that byte based machines are typically much bigger than</span> |
| <span class="doccomment">/// their Unicode analogues (because they can decode UTF-8 directly), this ends</span> |
| <span class="doccomment">/// up being a pretty significant savings.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Inst</span> { |
| <span class="doccomment">/// Match indicates that the program has reached a match state.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The number in the match corresponds to the Nth logical regular</span> |
| <span class="doccomment">/// expression in this program. This index is always 0 for normal regex</span> |
| <span class="doccomment">/// programs. Values greater than 0 appear when compiling regex sets, and</span> |
| <span class="doccomment">/// each match instruction gets its own unique value. The value corresponds</span> |
| <span class="doccomment">/// to the Nth regex in the set.</span> |
| <span class="ident">Match</span>(<span class="ident">usize</span>), |
| <span class="doccomment">/// Save causes the program to save the current location of the input in</span> |
| <span class="doccomment">/// the slot indicated by InstSave.</span> |
| <span class="ident">Save</span>(<span class="ident">InstSave</span>), |
| <span class="doccomment">/// Split causes the program to diverge to one of two paths in the</span> |
| <span class="doccomment">/// program, preferring goto1 in InstSplit.</span> |
| <span class="ident">Split</span>(<span class="ident">InstSplit</span>), |
| <span class="doccomment">/// EmptyLook represents a zero-width assertion in a regex program. A</span> |
| <span class="doccomment">/// zero-width assertion does not consume any of the input text.</span> |
| <span class="ident">EmptyLook</span>(<span class="ident">InstEmptyLook</span>), |
| <span class="doccomment">/// Char requires the regex program to match the character in InstChar at</span> |
| <span class="doccomment">/// the current position in the input.</span> |
| <span class="ident">Char</span>(<span class="ident">InstChar</span>), |
| <span class="doccomment">/// Ranges requires the regex program to match the character at the current</span> |
| <span class="doccomment">/// position in the input with one of the ranges specified in InstRanges.</span> |
| <span class="ident">Ranges</span>(<span class="ident">InstRanges</span>), |
| <span class="doccomment">/// Bytes is like Ranges, except it expresses a single byte range. It is</span> |
| <span class="doccomment">/// used in conjunction with Split instructions to implement multi-byte</span> |
| <span class="doccomment">/// character classes.</span> |
| <span class="ident">Bytes</span>(<span class="ident">InstBytes</span>), |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Inst</span> { |
| <span class="doccomment">/// Returns true if and only if this is a match instruction.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_match</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Inst</span>::<span class="ident">Match</span>(_) <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Representation of the Save instruction.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InstSave</span> { |
| <span class="doccomment">/// The next location to execute in the program.</span> |
| <span class="kw">pub</span> <span class="ident">goto</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// The capture slot (there are two slots for every capture in a regex,</span> |
| <span class="doccomment">/// including the zeroth capture for the entire match).</span> |
| <span class="kw">pub</span> <span class="ident">slot</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="doccomment">/// Representation of the Split instruction.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InstSplit</span> { |
| <span class="doccomment">/// The first instruction to try. A match resulting from following goto1</span> |
| <span class="doccomment">/// has precedence over a match resulting from following goto2.</span> |
| <span class="kw">pub</span> <span class="ident">goto1</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// The second instruction to try. A match resulting from following goto1</span> |
| <span class="doccomment">/// has precedence over a match resulting from following goto2.</span> |
| <span class="kw">pub</span> <span class="ident">goto2</span>: <span class="ident">InstPtr</span>, |
| } |
| |
| <span class="doccomment">/// Representation of the EmptyLook instruction.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InstEmptyLook</span> { |
| <span class="doccomment">/// The next location to execute in the program if this instruction</span> |
| <span class="doccomment">/// succeeds.</span> |
| <span class="kw">pub</span> <span class="ident">goto</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// The type of zero-width assertion to check.</span> |
| <span class="kw">pub</span> <span class="ident">look</span>: <span class="ident">EmptyLook</span>, |
| } |
| |
| <span class="doccomment">/// The set of zero-width match instructions.</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">PartialEq</span>, <span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">EmptyLook</span> { |
| <span class="doccomment">/// Start of line or input.</span> |
| <span class="ident">StartLine</span>, |
| <span class="doccomment">/// End of line or input.</span> |
| <span class="ident">EndLine</span>, |
| <span class="doccomment">/// Start of input.</span> |
| <span class="ident">StartText</span>, |
| <span class="doccomment">/// End of input.</span> |
| <span class="ident">EndText</span>, |
| <span class="doccomment">/// Word character on one side and non-word character on other.</span> |
| <span class="ident">WordBoundary</span>, |
| <span class="doccomment">/// Word character on both sides or non-word character on both sides.</span> |
| <span class="ident">NotWordBoundary</span>, |
| <span class="doccomment">/// ASCII word boundary.</span> |
| <span class="ident">WordBoundaryAscii</span>, |
| <span class="doccomment">/// Not ASCII word boundary.</span> |
| <span class="ident">NotWordBoundaryAscii</span>, |
| } |
| |
| <span class="doccomment">/// Representation of the Char instruction.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InstChar</span> { |
| <span class="doccomment">/// The next location to execute in the program if this instruction</span> |
| <span class="doccomment">/// succeeds.</span> |
| <span class="kw">pub</span> <span class="ident">goto</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// The character to test.</span> |
| <span class="kw">pub</span> <span class="ident">c</span>: <span class="ident">char</span>, |
| } |
| |
| <span class="doccomment">/// Representation of the Ranges instruction.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InstRanges</span> { |
| <span class="doccomment">/// The next location to execute in the program if this instruction</span> |
| <span class="doccomment">/// succeeds.</span> |
| <span class="kw">pub</span> <span class="ident">goto</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// The set of Unicode scalar value ranges to test.</span> |
| <span class="kw">pub</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="kw">impl</span> <span class="ident">InstRanges</span> { |
| <span class="doccomment">/// Tests whether the given input character matches this instruction.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">matches</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">c</span>: <span class="ident">Char</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="comment">// This speeds up the `match_class_unicode` benchmark by checking</span> |
| <span class="comment">// some common cases quickly without binary search. e.g., Matching</span> |
| <span class="comment">// a Unicode class on predominantly ASCII text.</span> |
| <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">iter</span>().<span class="ident">take</span>(<span class="number">4</span>) { |
| <span class="kw">if</span> <span class="ident">c</span> <span class="op"><</span> <span class="ident">r</span>.<span class="number">0</span> { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| <span class="kw">if</span> <span class="ident">c</span> <span class="op"><=</span> <span class="ident">r</span>.<span class="number">1</span> { |
| <span class="kw">return</span> <span class="bool-val">true</span>; |
| } |
| } |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> { |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="number">1</span> <span class="op"><</span> <span class="ident">c</span> { |
| <span class="ident">Ordering</span>::<span class="ident">Less</span> |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">r</span>.<span class="number">0</span> <span class="op">></span> <span class="ident">c</span> { |
| <span class="ident">Ordering</span>::<span class="ident">Greater</span> |
| } <span class="kw">else</span> { |
| <span class="ident">Ordering</span>::<span class="ident">Equal</span> |
| } |
| }).<span class="ident">is_ok</span>() |
| } |
| |
| <span class="doccomment">/// Return the number of distinct characters represented by all of the</span> |
| <span class="doccomment">/// ranges.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_chars</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span>(<span class="ident">s</span>, <span class="ident">e</span>)<span class="op">|</span> <span class="number">1</span> <span class="op">+</span> (<span class="ident">e</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">-</span> (<span class="ident">s</span> <span class="kw">as</span> <span class="ident">u32</span>)) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="ident">len</span><span class="op">|</span> <span class="ident">acc</span> <span class="op">+</span> <span class="ident">len</span>) |
| <span class="kw">as</span> <span class="ident">usize</span> |
| } |
| } |
| |
| <span class="doccomment">/// Representation of the Bytes instruction.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InstBytes</span> { |
| <span class="doccomment">/// The next location to execute in the program if this instruction</span> |
| <span class="doccomment">/// succeeds.</span> |
| <span class="kw">pub</span> <span class="ident">goto</span>: <span class="ident">InstPtr</span>, |
| <span class="doccomment">/// The start (inclusive) of this byte range.</span> |
| <span class="kw">pub</span> <span class="ident">start</span>: <span class="ident">u8</span>, |
| <span class="doccomment">/// The end (inclusive) of this byte range.</span> |
| <span class="kw">pub</span> <span class="ident">end</span>: <span class="ident">u8</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">InstBytes</span> { |
| <span class="doccomment">/// Returns true if and only if the given byte is in this range.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">matches</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">byte</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="ident">byte</span> <span class="op">&&</span> <span class="ident">byte</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">end</span> |
| } |
| } |
| </pre> |
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