| <!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/levenshtein_automata-0.2.1/src/levenshtein_nfa.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>levenshtein_nfa.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="../../levenshtein_automata/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="../../levenshtein_automata/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::cmp::Ordering; |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub fn </span>compute_characteristic_vector(query: <span class="kw-2">&</span>[char], c: char) -> u64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>chi = <span class="number">0u64</span>; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..query.len() { |
| <span class="kw">if </span>query[i] == c { |
| chi |= <span class="number">1u64 </span><< i; |
| } |
| } |
| chi |
| } |
| |
| <span class="attribute">#[derive(Debug, Hash, Eq, PartialEq, Clone)] |
| </span><span class="kw">pub struct </span>MultiState { |
| states: Vec<NFAState>, |
| } |
| |
| <span class="kw">impl </span>MultiState { |
| <span class="kw">pub fn </span>states(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[NFAState] { |
| <span class="kw-2">&</span><span class="self">self</span>.states[..] |
| } |
| |
| <span class="kw">fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.states.clear() |
| } |
| |
| <span class="kw">pub fn </span>empty() -> MultiState { |
| MultiState { states: Vec::new() } |
| } |
| |
| <span class="kw">pub fn </span>normalize(<span class="kw-2">&mut </span><span class="self">self</span>) -> u32 { |
| <span class="kw">let </span>min_offset: u32 = <span class="self">self |
| </span>.states |
| .iter() |
| .map(|state| state.offset) |
| .min() |
| .unwrap_or(<span class="number">0u32</span>); |
| <span class="kw">for </span>state <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.states { |
| state.offset -= min_offset; |
| } |
| <span class="self">self</span>.states.sort(); |
| min_offset |
| } |
| |
| <span class="kw">fn </span>add_state(<span class="kw-2">&mut </span><span class="self">self</span>, new_state: NFAState) { |
| <span class="kw">if </span><span class="self">self</span>.states.iter().any(|state| state.imply(new_state)) { |
| <span class="comment">// this state is already included in the current set of states. |
| </span><span class="kw">return</span>; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">while </span>i < <span class="self">self</span>.states.len() { |
| <span class="kw">if </span>new_state.imply(<span class="self">self</span>.states[i]) { |
| <span class="self">self</span>.states.swap_remove(i); |
| } <span class="kw">else </span>{ |
| i += <span class="number">1</span>; |
| } |
| } |
| |
| <span class="self">self</span>.states.push(new_state); |
| } |
| } |
| |
| <span class="doccomment">/// Levenshtein Distance computed by a Levenshtein Automaton. |
| /// |
| /// Levenshtein automata can only compute the exact Levenshtein distance |
| /// up to a given `max_distance`. |
| /// |
| /// Over this distance, the automaton will invariably |
| /// return `Distance::AtLeast(max_distance + 1)`. |
| </span><span class="attribute">#[derive(Eq, PartialEq, Debug, Clone, Copy)] |
| </span><span class="kw">pub enum </span>Distance { |
| Exact(u8), |
| AtLeast(u8), |
| } |
| |
| <span class="kw">impl </span>Distance { |
| <span class="doccomment">/// Returns the highest lower bound for the distance. |
| /// It is equivalent to |
| /// |
| /// ```ignored |
| /// match distance { |
| /// Distance::Exact(d) | |
| /// Distance::AtLeast(d) => d, |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>to_u8(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Distance::Exact(d) | Distance::AtLeast(d) => d, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>PartialOrd <span class="kw">for </span>Distance { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Distance) -> <span class="prelude-ty">Option</span><Ordering> { |
| <span class="kw">use </span><span class="self">self</span>::Distance::<span class="kw-2">*</span>; |
| <span class="kw">match </span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">*</span>other) { |
| (Exact(left), Exact(right)) => left.partial_cmp(<span class="kw-2">&</span>right), |
| (Exact(left), AtLeast(right)) => { |
| <span class="kw">if </span>right > left { |
| <span class="prelude-val">Some</span>(Ordering::Greater) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| (AtLeast(left), Exact(right)) => { |
| <span class="kw">if </span>left > right { |
| <span class="prelude-val">Some</span>(Ordering::Less) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| (AtLeast(left), AtLeast(right)) => { |
| <span class="kw">if </span>left == right { |
| <span class="prelude-val">Some</span>(Ordering::Equal) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| } |
| } |
| |
| <span class="kw">pub struct </span>LevenshteinNFA { |
| max_distance: u8, |
| damerau: bool, |
| } |
| |
| <span class="kw">fn </span>extract_bit(bitset: u64, pos: u8) -> bool { |
| <span class="kw">let </span>pos = pos <span class="kw">as </span>usize; |
| <span class="kw">let </span>shift = bitset >> pos; |
| <span class="kw">let </span>bit = shift & <span class="number">1</span>; |
| bit == <span class="number">1u64 |
| </span>} |
| |
| <span class="kw">fn </span>dist(left: u32, right: u32) -> u32 { |
| <span class="kw">if </span>left > right { |
| left - right |
| } <span class="kw">else </span>{ |
| right - left |
| } |
| } |
| |
| <span class="kw">impl </span>LevenshteinNFA { |
| <span class="kw">pub fn </span>levenshtein(max_distance: u8, transposition: bool) -> LevenshteinNFA { |
| LevenshteinNFA { |
| max_distance: max_distance, |
| damerau: transposition, |
| } |
| } |
| |
| <span class="kw">pub fn </span>multistate_distance(<span class="kw-2">&</span><span class="self">self</span>, multistate: <span class="kw-2">&</span>MultiState, query_len: u32) -> Distance { |
| multistate |
| .states() |
| .iter() |
| .map(|state| state.distance + dist(query_len, state.offset) <span class="kw">as </span>u8) |
| .filter(|d| <span class="kw-2">*</span>d <= <span class="self">self</span>.max_distance) |
| .min() |
| .map(Distance::Exact) |
| .unwrap_or_else(|| Distance::AtLeast(<span class="self">self</span>.max_distance + <span class="number">1u8</span>)) |
| } |
| |
| <span class="kw">pub fn </span>max_distance(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="self">self</span>.max_distance |
| } |
| |
| <span class="kw">pub fn </span>multistate_diameter(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="number">2u8 </span>* <span class="self">self</span>.max_distance + <span class="number">1u8 |
| </span>} |
| |
| <span class="kw">pub fn </span>initial_states(<span class="kw-2">&</span><span class="self">self</span>) -> MultiState { |
| <span class="kw">let </span><span class="kw-2">mut </span>multistate = MultiState::empty(); |
| multistate.add_state(NFAState::default()); |
| multistate |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub fn </span>compute_distance(<span class="kw-2">&</span><span class="self">self</span>, query: <span class="kw-2">&</span>str, other: <span class="kw-2">&</span>str) -> Distance { |
| <span class="kw">use </span>std::mem; |
| <span class="kw">let </span>query_chars: Vec<char> = query.chars().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>current_state = <span class="self">self</span>.initial_states(); |
| <span class="kw">let </span><span class="kw-2">mut </span>next_state = MultiState::empty(); |
| <span class="kw">for </span>chr <span class="kw">in </span>other.chars() { |
| next_state.clear(); |
| <span class="kw">let </span>chi: u64 = compute_characteristic_vector(<span class="kw-2">&</span>query_chars[..], chr); |
| <span class="self">self</span>.transition(<span class="kw-2">&</span>current_state, <span class="kw-2">&mut </span>next_state, chi); |
| mem::swap(<span class="kw-2">&mut </span>current_state, <span class="kw-2">&mut </span>next_state); |
| } |
| <span class="self">self</span>.multistate_distance(<span class="kw-2">&</span>current_state, query_chars.len() <span class="kw">as </span>u32) |
| } |
| |
| <span class="kw">fn </span>simple_transition(<span class="kw-2">&</span><span class="self">self</span>, state: NFAState, symbol: u64, multistate: <span class="kw-2">&mut </span>MultiState) { |
| <span class="kw">if </span>state.distance < <span class="self">self</span>.max_distance { |
| <span class="comment">// apparently we still have room to |
| // make mistakes. |
| |
| // insertion |
| </span>multistate.add_state(NFAState { |
| offset: state.offset, |
| distance: state.distance + <span class="number">1</span>, |
| in_transpose: <span class="bool-val">false</span>, |
| }); |
| |
| <span class="comment">// substitution |
| </span>multistate.add_state(NFAState { |
| offset: state.offset + <span class="number">1</span>, |
| distance: state.distance + <span class="number">1</span>, |
| in_transpose: <span class="bool-val">false</span>, |
| }); |
| |
| <span class="kw">for </span>d <span class="kw">in </span><span class="number">1u8</span>..<span class="self">self</span>.max_distance + <span class="number">1u8 </span>- state.distance { |
| <span class="kw">if </span>extract_bit(symbol, d) { |
| <span class="comment">// for d > 0, as many deletion and character match |
| </span>multistate.add_state(NFAState { |
| offset: state.offset + <span class="number">1 </span>+ u32::from(d), |
| distance: state.distance + d, |
| in_transpose: <span class="bool-val">false</span>, |
| }); |
| } |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.damerau && extract_bit(symbol, <span class="number">1</span>) { |
| multistate.add_state(NFAState { |
| offset: state.offset, |
| distance: state.distance + <span class="number">1</span>, |
| in_transpose: <span class="bool-val">true</span>, |
| }); |
| } |
| } |
| <span class="kw">if </span>extract_bit(symbol, <span class="number">0</span>) { |
| multistate.add_state(NFAState { |
| offset: state.offset + <span class="number">1</span>, |
| distance: state.distance, |
| in_transpose: <span class="bool-val">false</span>, |
| }); |
| } |
| |
| <span class="kw">if </span>state.in_transpose && extract_bit(symbol, <span class="number">0u8</span>) { |
| multistate.add_state(NFAState { |
| offset: state.offset + <span class="number">2</span>, |
| distance: state.distance, |
| in_transpose: <span class="bool-val">false</span>, |
| }); |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>transition( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| current_state: <span class="kw-2">&</span>MultiState, |
| dest_state: <span class="kw-2">&mut </span>MultiState, |
| shifted_chi_vector: u64, |
| ) { |
| dest_state.clear(); |
| <span class="kw">let </span>mask = (<span class="number">1u64 </span><< <span class="self">self</span>.multistate_diameter()) - <span class="number">1u64</span>; |
| <span class="kw">for </span><span class="kw-2">&</span>state <span class="kw">in </span>current_state.states() { |
| <span class="kw">let </span>shifted_chi_vector = (shifted_chi_vector >> state.offset <span class="kw">as </span>usize) & mask; |
| <span class="self">self</span>.simple_transition(state, shifted_chi_vector, dest_state); |
| } |
| dest_state.states.sort(); |
| } |
| } |
| |
| <span class="attribute">#[derive(Default, Hash, Eq, PartialOrd, Ord, PartialEq, Copy, Clone, Debug)] |
| </span><span class="kw">pub struct </span>NFAState { |
| offset: u32, |
| distance: u8, |
| in_transpose: bool, |
| } |
| |
| <span class="kw">impl </span>NFAState { |
| <span class="kw">fn </span>imply(<span class="kw-2">&</span><span class="self">self</span>, other: NFAState) -> bool { |
| <span class="kw">let </span>tranpose_imply = <span class="self">self</span>.in_transpose | !other.in_transpose; |
| <span class="kw">let </span>delta_offset: u32 = <span class="kw">if </span><span class="self">self</span>.offset >= other.offset { |
| <span class="self">self</span>.offset - other.offset |
| } <span class="kw">else </span>{ |
| other.offset - <span class="self">self</span>.offset |
| }; |
| <span class="kw">if </span>tranpose_imply { |
| u32::from(other.distance) >= u32::from(<span class="self">self</span>.distance) + delta_offset |
| } <span class="kw">else </span>{ |
| u32::from(other.distance) > u32::from(<span class="self">self</span>.distance) + delta_offset |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="levenshtein_automata" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
