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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/aho-corasick-1.0.2/src/util/special.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>special.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="../../../aho_corasick/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="../../../aho_corasick/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><span class="kw">crate</span>::util::primitives::StateID;
<span class="doccomment">/// A collection of sentinel state IDs for Aho-Corasick automata.
///
/// This specifically enables the technique by which we determine which states
/// are dead, matches or start states. Namely, by arranging states in a
/// particular order, we can determine the type of a state simply by looking at
/// its ID.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Special {
<span class="doccomment">/// The maximum ID of all the &quot;special&quot; states. This corresponds either to
/// start_anchored_id when a prefilter is active and max_match_id when a
/// prefilter is not active. The idea here is that if there is no prefilter,
/// then there is no point in treating start states as special.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) max_special_id: StateID,
<span class="doccomment">/// The maximum ID of all the match states. Any state ID bigger than this
/// is guaranteed to be a non-match ID.
///
/// It is possible and legal for max_match_id to be equal to
/// start_anchored_id, which occurs precisely in the case where the empty
/// string is a pattern that was added to the underlying automaton.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) max_match_id: StateID,
<span class="doccomment">/// The state ID of the start state used for unanchored searches.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) start_unanchored_id: StateID,
<span class="doccomment">/// The state ID of the start state used for anchored searches. This is
/// always start_unanchored_id+1.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) start_anchored_id: StateID,
}
<span class="kw">impl </span>Special {
<span class="doccomment">/// Create a new set of &quot;special&quot; state IDs with all IDs initialized to
/// zero. The general idea here is that they will be updated and set to
/// correct values later.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>zero() -&gt; Special {
Special {
max_special_id: StateID::ZERO,
max_match_id: StateID::ZERO,
start_unanchored_id: StateID::ZERO,
start_anchored_id: StateID::ZERO,
}
}
}
</code></pre></div>
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