| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tantivy-fst-0.4.0/src/regex/dfa.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>dfa.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../tantivy_fst/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../tantivy_fst/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::{HashMap, HashSet}; |
| <span class="kw">use </span>std::fmt; |
| |
| <span class="kw">use </span><span class="kw">super</span>::sparse::SparseSet; |
| <span class="kw">use </span><span class="kw">super</span>::Error; |
| <span class="kw">use </span><span class="kw">super</span>::Inst; |
| |
| <span class="kw">const </span>STATE_LIMIT: usize = <span class="number">1_000</span>; <span class="comment">// currently at least 2MB >_< |
| |
| </span><span class="kw">pub struct </span>DfaBuilder { |
| dfa: Dfa, |
| cache: HashMap<Vec<usize>, usize>, |
| } |
| |
| <span class="kw">pub struct </span>Dfa { |
| insts: Vec<Inst>, |
| states: Vec<State>, |
| } |
| |
| <span class="kw">struct </span>State { |
| insts: Vec<usize>, |
| next: [<span class="prelude-ty">Option</span><usize>; <span class="number">256</span>], |
| is_match: bool, |
| } |
| |
| <span class="kw">impl </span>DfaBuilder { |
| <span class="kw">pub fn </span>new(insts: Vec<Inst>) -> <span class="self">Self </span>{ |
| DfaBuilder { |
| dfa: Dfa { |
| insts, |
| states: Vec::with_capacity(<span class="number">16</span>), |
| }, |
| cache: HashMap::with_capacity(<span class="number">1024</span>), |
| } |
| } |
| |
| <span class="kw">pub fn </span>build(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Dfa, Error> { |
| <span class="kw">let </span><span class="kw-2">mut </span>cur = SparseSet::new(<span class="self">self</span>.dfa.insts.len()); |
| <span class="kw">let </span><span class="kw-2">mut </span>next = SparseSet::new(<span class="self">self</span>.dfa.insts.len()); |
| |
| <span class="self">self</span>.dfa.add(<span class="kw-2">&mut </span>cur, <span class="number">0</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>states = <span class="macro">vec!</span>[<span class="self">self</span>.cached_state(<span class="kw-2">&</span>cur).unwrap()]; |
| <span class="kw">let </span><span class="kw-2">mut </span>seen = HashSet::new(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(s) = states.pop() { |
| <span class="kw">for </span>b <span class="kw">in </span><span class="number">0</span>..<span class="number">256 </span>{ |
| <span class="kw">let </span>ns = <span class="self">self</span>.run_state(<span class="kw-2">&mut </span>cur, <span class="kw-2">&mut </span>next, s, b <span class="kw">as </span>u8); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ns) = ns { |
| <span class="kw">if </span>!seen.contains(<span class="kw-2">&</span>ns) { |
| seen.insert(ns); |
| states.push(ns); |
| } |
| } |
| <span class="kw">if </span><span class="self">self</span>.dfa.states.len() > STATE_LIMIT { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::TooManyStates(STATE_LIMIT)); |
| } |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.dfa) |
| } |
| |
| <span class="kw">fn </span>run_state( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| cur: <span class="kw-2">&mut </span>SparseSet, |
| next: <span class="kw-2">&mut </span>SparseSet, |
| state: usize, |
| byte: u8, |
| ) -> <span class="prelude-ty">Option</span><usize> { |
| cur.clear(); |
| <span class="kw">for </span><span class="kw-2">&</span>ip <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.dfa.states[state].insts { |
| cur.add(ip); |
| } |
| <span class="self">self</span>.dfa.run(cur, next, byte); |
| <span class="kw">let </span>next_state = <span class="self">self</span>.cached_state(next); |
| <span class="self">self</span>.dfa.states[state].next[byte <span class="kw">as </span>usize] = next_state; |
| next_state |
| } |
| |
| <span class="kw">fn </span>cached_state(<span class="kw-2">&mut </span><span class="self">self</span>, set: <span class="kw-2">&</span>SparseSet) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">use </span><span class="kw">super</span>::Inst::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::collections::hash_map::Entry; |
| |
| <span class="comment">// There are probably many ways to optimize this routine. ---AG |
| |
| </span><span class="kw">let </span><span class="kw-2">mut </span>insts = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>is_match = <span class="bool-val">false</span>; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..set.len() { |
| <span class="kw">let </span>ip = set.get(i); |
| <span class="kw">match </span><span class="self">self</span>.dfa.insts[ip] { |
| Jump(<span class="kw">_</span>) | Split(<span class="kw">_</span>, <span class="kw">_</span>) => {} |
| Range(<span class="kw">_</span>, <span class="kw">_</span>) => insts.push(ip), |
| Match => { |
| is_match = <span class="bool-val">true</span>; |
| insts.push(ip); |
| } |
| } |
| } |
| <span class="kw">if </span>insts.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="prelude-val">Some</span>(<span class="kw">match </span><span class="self">self</span>.cache.entry(insts.clone()) { |
| Entry::Occupied(v) => <span class="kw-2">*</span>v.get(), |
| Entry::Vacant(v) => { |
| <span class="self">self</span>.dfa.states.push(State { |
| insts, |
| next: [<span class="prelude-val">None</span>; <span class="number">256</span>], |
| is_match, |
| }); |
| <span class="kw-2">*</span>v.insert(<span class="self">self</span>.dfa.states.len() - <span class="number">1</span>) |
| } |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>Dfa { |
| <span class="kw">pub fn </span>is_match(<span class="kw-2">&</span><span class="self">self</span>, si: usize) -> bool { |
| <span class="self">self</span>.states[si].is_match |
| } |
| |
| <span class="kw">pub fn </span>accept(<span class="kw-2">&</span><span class="self">self</span>, si: usize, byte: u8) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.states[si].next[byte <span class="kw">as </span>usize] |
| } |
| |
| <span class="kw">fn </span>add(<span class="kw-2">&</span><span class="self">self</span>, set: <span class="kw-2">&mut </span>SparseSet, ip: usize) { |
| <span class="kw">use </span><span class="kw">super</span>::Inst::<span class="kw-2">*</span>; |
| |
| <span class="kw">if </span>set.contains(ip) { |
| <span class="kw">return</span>; |
| } |
| set.add(ip); |
| <span class="kw">match </span><span class="self">self</span>.insts[ip] { |
| Match | Range(<span class="kw">_</span>, <span class="kw">_</span>) => {} |
| Jump(ip) => <span class="self">self</span>.add(set, ip), |
| Split(ip1, ip2) => { |
| <span class="self">self</span>.add(set, ip1); |
| <span class="self">self</span>.add(set, ip2); |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>run(<span class="kw-2">&</span><span class="self">self</span>, from: <span class="kw-2">&</span>SparseSet, to: <span class="kw-2">&mut </span>SparseSet, byte: u8) -> bool { |
| <span class="kw">use </span><span class="kw">super</span>::Inst::<span class="kw-2">*</span>; |
| to.clear(); |
| <span class="kw">let </span><span class="kw-2">mut </span>is_match = <span class="bool-val">false</span>; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..from.len() { |
| <span class="kw">let </span>ip = from.get(i); |
| <span class="kw">match </span><span class="self">self</span>.insts[ip] { |
| Jump(<span class="kw">_</span>) | Split(<span class="kw">_</span>, <span class="kw">_</span>) => {} |
| Match => is_match = <span class="bool-val">true</span>, |
| Range(s, e) => { |
| <span class="kw">if </span>s <= byte && byte <= e { |
| <span class="self">self</span>.add(to, ip + <span class="number">1</span>); |
| } |
| } |
| } |
| } |
| is_match |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Dfa { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">for </span>(i, inst) <span class="kw">in </span><span class="self">self</span>.insts.iter().enumerate() { |
| <span class="macro">writeln!</span>(f, <span class="string">"{:03} {:?}"</span>, i, inst)<span class="question-mark">?</span>; |
| } |
| <span class="macro">writeln!</span>(f, <span class="string">"------------"</span>)<span class="question-mark">?</span>; |
| <span class="kw">for </span>(i, state) <span class="kw">in </span><span class="self">self</span>.states.iter().enumerate() { |
| <span class="kw">if </span>state.is_match { |
| <span class="macro">writeln!</span>(f, <span class="string">"{:03}* {:?}"</span>, i, state.insts)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="macro">writeln!</span>(f, <span class="string">"{:03} {:?}"</span>, i, state.insts)<span class="question-mark">?</span>; |
| } |
| <span class="kw">for </span>j <span class="kw">in </span><span class="number">0</span>..<span class="number">256 </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(si) = state.next[j] { |
| <span class="macro">writeln!</span>(f, <span class="string">"{:03} {:X} => {}"</span>, i, j, si)<span class="question-mark">?</span>; |
| } |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy_fst" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
