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<!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/alphabet.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>alphabet.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::slice;
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>FullCharacteristicVector(Vec&lt;u32&gt;);
<span class="kw">impl </span>FullCharacteristicVector {
<span class="kw">pub fn </span>shift_and_mask(<span class="kw-2">&amp;</span><span class="self">self</span>, offset: usize, mask: u32) -&gt; u32 {
<span class="kw">let </span>bucket_id = offset / <span class="number">32</span>;
<span class="kw">let </span>align = offset - bucket_id * <span class="number">32</span>;
<span class="kw">if </span>align == <span class="number">0 </span>{
<span class="self">self</span>.<span class="number">0</span>[bucket_id] &amp; mask
} <span class="kw">else </span>{
<span class="kw">let </span>left = (<span class="self">self</span>.<span class="number">0</span>[bucket_id] &gt;&gt; align) <span class="kw">as </span>u32;
<span class="kw">let </span>right = <span class="self">self</span>.<span class="number">0</span>[bucket_id + <span class="number">1</span>] &lt;&lt; (<span class="number">32 </span>- align) <span class="kw">as </span>u32;
(left | right) &amp; mask
}
}
}
<span class="kw">pub struct </span>Alphabet {
charset: Vec&lt;(char, FullCharacteristicVector)&gt;,
}
<span class="kw">impl </span>Alphabet {
<span class="kw">pub fn </span>iter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; slice::Iter&lt;(char, FullCharacteristicVector)&gt; {
<span class="self">self</span>.charset.iter()
}
<span class="kw">pub fn </span>for_query_chars(query_chars: <span class="kw-2">&amp;</span>[char]) -&gt; Alphabet {
<span class="kw">let </span><span class="kw-2">mut </span>charset = Vec::from(query_chars);
charset.sort();
charset.dedup();
<span class="kw">let </span>charset = charset
.into_iter()
.map(|c| {
<span class="kw">let </span><span class="kw-2">mut </span>bits: Vec&lt;u32&gt; = query_chars
.chunks(<span class="number">32</span>)
.map(|chunk| {
<span class="kw">let </span><span class="kw-2">mut </span>chunk_bits = <span class="number">0u32</span>;
<span class="kw">let </span><span class="kw-2">mut </span>bit = <span class="number">1u32</span>;
<span class="kw">for </span><span class="kw-2">&amp;</span>chr <span class="kw">in </span>chunk {
<span class="kw">if </span>chr == c {
chunk_bits |= bit;
}
bit &lt;&lt;= <span class="number">1</span>;
}
chunk_bits
})
.collect();
bits.push(<span class="number">0u32</span>);
(c, FullCharacteristicVector(bits))
})
.collect();
Alphabet { charset: charset }
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::{Alphabet, FullCharacteristicVector};
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_alphabet() {
<span class="kw">let </span>chars: Vec&lt;char&gt; = <span class="string">&quot;happy&quot;</span>.chars().collect();
<span class="kw">let </span>alphabet = Alphabet::for_query_chars(<span class="kw-2">&amp;</span>chars);
<span class="kw">let </span><span class="kw-2">mut </span>it = alphabet.iter();
{
<span class="kw">let </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>c, <span class="kw-2">ref </span>chi) = it.next().unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>c, <span class="string">&#39;a&#39;</span>);
<span class="macro">assert_eq!</span>(chi.<span class="number">0</span>[<span class="number">0</span>], <span class="number">2u32</span>);
}
{
<span class="kw">let </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>c, <span class="kw-2">ref </span>chi) = it.next().unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>c, <span class="string">&#39;h&#39;</span>);
<span class="macro">assert_eq!</span>(chi.<span class="number">0</span>[<span class="number">0</span>], <span class="number">1u32</span>);
}
{
<span class="kw">let </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>c, <span class="kw-2">ref </span>chi) = it.next().unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>c, <span class="string">&#39;p&#39;</span>);
<span class="macro">assert_eq!</span>(chi.<span class="number">0</span>[<span class="number">0</span>], <span class="number">4u32 </span>+ <span class="number">8u32</span>);
}
{
<span class="kw">let </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>c, <span class="kw-2">ref </span>chi) = it.next().unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>c, <span class="string">&#39;y&#39;</span>);
<span class="macro">assert_eq!</span>(chi.<span class="number">0</span>[<span class="number">0</span>], <span class="number">16u32</span>);
}
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_full_characteristic() {
<span class="macro">assert_eq!</span>(
FullCharacteristicVector(<span class="macro">vec!</span>[<span class="number">2u32</span>, <span class="number">0u32</span>]).shift_and_mask(<span class="number">1</span>, <span class="number">1u32</span>),
<span class="number">1
</span>);
<span class="macro">assert_eq!</span>(
FullCharacteristicVector(<span class="macro">vec!</span>[(<span class="number">1u32 </span>&lt;&lt; <span class="number">5</span>) + (<span class="number">1u32 </span>&lt;&lt; <span class="number">10</span>), <span class="number">0u32</span>])
.shift_and_mask(<span class="number">3</span>, <span class="number">63u32</span>),
<span class="number">4
</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_long_characteristic() {
<span class="kw">let </span>query_chars: Vec&lt;char&gt; = <span class="string">&quot;aaaaaaaaaaaaaaaaaaaaaaaaaaaaaabcabewa&quot;</span>.chars().collect();
<span class="kw">let </span>alphabet = Alphabet::for_query_chars(<span class="kw-2">&amp;</span>query_chars[..]);
<span class="kw">let </span><span class="kw-2">mut </span>alphabet_it = alphabet.iter();
{
<span class="kw">let </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>c, <span class="kw-2">ref </span>chi) = alphabet_it.next().unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>c, <span class="string">&#39;a&#39;</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">0</span>, <span class="number">7</span>), <span class="number">7</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">28</span>, <span class="number">7</span>), <span class="number">3</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">28</span>, <span class="number">127</span>), <span class="number">1 </span>+ <span class="number">2 </span>+ <span class="number">16</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">28</span>, <span class="number">4095</span>), <span class="number">1 </span>+ <span class="number">2 </span>+ <span class="number">16 </span>+ <span class="number">256</span>);
}
{
<span class="kw">let </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>c, <span class="kw-2">ref </span>chi) = alphabet_it.next().unwrap();
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>c, <span class="string">&#39;b&#39;</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">0</span>, <span class="number">7</span>), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">28</span>, <span class="number">15</span>), <span class="number">4</span>);
<span class="macro">assert_eq!</span>(chi.shift_and_mask(<span class="number">28</span>, <span class="number">63</span>), <span class="number">4 </span>+ <span class="number">32</span>);
}
}
}
</code></pre></div>
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