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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| </pre><pre class="rust "> |
| <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">mem</span>; |
| |
| <span class="kw">use</span> <span class="kw">super</span>::{ |
| <span class="ident">FAIL_STATE</span>, |
| <span class="ident">StateIdx</span>, <span class="ident">AcAutomaton</span>, <span class="ident">Transitions</span>, <span class="ident">Match</span>, |
| <span class="ident">usize_bytes</span>, <span class="ident">vec_bytes</span>, |
| }; |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">autiter</span>::<span class="ident">Automaton</span>; |
| |
| <span class="doccomment">/// A complete Aho-Corasick automaton.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This uses a single transition matrix that permits each input character</span> |
| <span class="doccomment">/// to move to the next state with a single lookup in the matrix.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is as fast as it gets, but it is guaranteed to use a lot of memory.</span> |
| <span class="doccomment">/// Namely, it will use at least `4 * 256 * #states`, where the number of</span> |
| <span class="doccomment">/// states is capped at length of all patterns concatenated.</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">FullAcAutomaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> { |
| <span class="ident">pats</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>, |
| <span class="ident">trans</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">StateIdx</span><span class="op">></span>, <span class="comment">// row-major, where states are rows</span> |
| <span class="ident">out</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span>, <span class="comment">// indexed by StateIdx</span> |
| <span class="ident">start_bytes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">>></span> <span class="ident">FullAcAutomaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> { |
| <span class="doccomment">/// Build a new expanded Aho-Corasick automaton from an existing</span> |
| <span class="doccomment">/// Aho-Corasick automaton.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Transitions</span><span class="op">></span>(<span class="ident">ac</span>: <span class="ident">AcAutomaton</span><span class="op"><</span><span class="ident">P</span>, <span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">FullAcAutomaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fac</span> <span class="op">=</span> <span class="ident">FullAcAutomaton</span> { |
| <span class="ident">pats</span>: <span class="macro">vec</span><span class="macro">!</span>[], |
| <span class="ident">trans</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">FAIL_STATE</span>; <span class="number">256</span> <span class="op">*</span> <span class="ident">ac</span>.<span class="ident">states</span>.<span class="ident">len</span>()], |
| <span class="ident">out</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="macro">vec</span><span class="macro">!</span>[]; <span class="ident">ac</span>.<span class="ident">states</span>.<span class="ident">len</span>()], |
| <span class="ident">start_bytes</span>: <span class="macro">vec</span><span class="macro">!</span>[], |
| }; |
| <span class="ident">fac</span>.<span class="ident">build_matrix</span>(<span class="kw-2">&</span><span class="ident">ac</span>); |
| <span class="ident">fac</span>.<span class="ident">pats</span> <span class="op">=</span> <span class="ident">ac</span>.<span class="ident">pats</span>; |
| <span class="ident">fac</span>.<span class="ident">start_bytes</span> <span class="op">=</span> <span class="ident">ac</span>.<span class="ident">start_bytes</span>; |
| <span class="ident">fac</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memory_usage</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">pats</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">vec_bytes</span>() <span class="op">+</span> <span class="ident">p</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>()) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>) |
| <span class="op">+</span> (<span class="number">4</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">trans</span>.<span class="ident">len</span>()) |
| <span class="op">+</span> <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">vec_bytes</span>() <span class="op">+</span> (<span class="ident">usize_bytes</span>() <span class="op">*</span> <span class="ident">v</span>.<span class="ident">len</span>())) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>) |
| <span class="op">+</span> <span class="self">self</span>.<span class="ident">start_bytes</span>.<span class="ident">len</span>() |
| } |
| |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">heap_bytes</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">pats</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">P</span><span class="op">></span>() <span class="op">+</span> <span class="ident">p</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>()) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>) |
| <span class="op">+</span> (<span class="number">4</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">trans</span>.<span class="ident">len</span>()) |
| <span class="op">+</span> <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">vec_bytes</span>() <span class="op">+</span> (<span class="ident">usize_bytes</span>() <span class="op">*</span> <span class="ident">v</span>.<span class="ident">len</span>())) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>) |
| <span class="op">+</span> <span class="self">self</span>.<span class="ident">start_bytes</span>.<span class="ident">len</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">i</span>: <span class="ident">u8</span>, <span class="ident">goto</span>: <span class="ident">StateIdx</span>) { |
| <span class="kw">let</span> <span class="ident">ns</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_states</span>(); |
| <span class="self">self</span>.<span class="ident">trans</span>[<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">ns</span> <span class="op">+</span> <span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">goto</span>; |
| } |
| |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_states</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">out</span>.<span class="ident">len</span>() |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">>></span> <span class="ident">Automaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FullAcAutomaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">next_state</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">i</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">StateIdx</span> { |
| <span class="kw">let</span> <span class="ident">at</span> <span class="op">=</span> <span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">num_states</span>() <span class="op">+</span> <span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="kw">unsafe</span> { <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">trans</span>.<span class="ident">get_unchecked</span>(<span class="ident">at</span>) } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">get_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>, <span class="ident">texti</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Match</span> { |
| <span class="kw">let</span> <span class="ident">pati</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">out</span>[<span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>][<span class="ident">outi</span>]; |
| <span class="kw">let</span> <span class="ident">patlen</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pats</span>[<span class="ident">pati</span>].<span class="ident">as_ref</span>().<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">patlen</span>; |
| <span class="ident">Match</span> { |
| <span class="ident">pati</span>: <span class="ident">pati</span>, |
| <span class="ident">start</span>: <span class="ident">start</span>, |
| <span class="ident">end</span>: <span class="ident">start</span> <span class="op">+</span> <span class="ident">patlen</span>, |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">has_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">unsafe</span> { <span class="ident">outi</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">get_unchecked</span>(<span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">len</span>() } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">start_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">start_bytes</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">patterns</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">P</span>] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">pats</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">pattern</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">P</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">pats</span>[<span class="ident">i</span>] |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">>></span> <span class="ident">FullAcAutomaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">build_matrix</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Transitions</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ac</span>: <span class="kw-2">&</span><span class="ident">AcAutomaton</span><span class="op"><</span><span class="ident">P</span>, <span class="ident">T</span><span class="op">></span>) { |
| <span class="kw">for</span> (<span class="ident">si</span>, <span class="ident">s</span>) <span class="kw">in</span> <span class="ident">ac</span>.<span class="ident">states</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>().<span class="ident">skip</span>(<span class="number">1</span>) { |
| <span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> (<span class="number">0</span>..<span class="number">256</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="kw">as</span> <span class="ident">u8</span>) { |
| <span class="self">self</span>.<span class="ident">set</span>(<span class="ident">si</span> <span class="kw">as</span> <span class="ident">StateIdx</span>, <span class="ident">b</span>, <span class="ident">ac</span>.<span class="ident">next_state</span>(<span class="ident">si</span> <span class="kw">as</span> <span class="ident">StateIdx</span>, <span class="ident">b</span>)); |
| } |
| <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">pati</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">s</span>.<span class="ident">out</span> { |
| <span class="self">self</span>.<span class="ident">out</span>[<span class="ident">si</span>].<span class="ident">push</span>(<span class="ident">pati</span>); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">FullAcAutomaton</span><span class="op"><</span><span class="ident">P</span><span class="op">></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="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"FullAcAutomaton({:?})"</span>, <span class="self">self</span>.<span class="ident">pats</span>) |
| } |
| } |
| </pre> |
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