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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 `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/unicode-normalization-0.1.21/src/lookups.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lookups.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" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" 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="icon" href="https://unicode-rs.github.io/unicode-rs_sm.png"></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="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../unicode_normalization/index.html"><div class="logo-container"><img src="https://unicode-rs.github.io/unicode-rs_sm.png" alt="logo"></div>
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</pre><pre class="rust"><code><span class="comment">// Copyright 2019 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! Lookups of unicode properties using minimal perfect hashing.</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::perfect_hash::mph_lookup</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::tables</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Look up the canonical combining class for a codepoint.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The value returned is as defined in the Unicode Character Database.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">canonical_combining_class</span>(<span class="ident">c</span>: <span class="ident">char</span>) -> <span class="ident">u8</span> {
<span class="ident">mph_lookup</span>(
<span class="ident">c</span>.<span class="ident">into</span>(),
<span class="ident">CANONICAL_COMBINING_CLASS_SALT</span>,
<span class="ident">CANONICAL_COMBINING_CLASS_KV</span>,
<span class="ident">u8_lookup_fk</span>,
<span class="ident">u8_lookup_fv</span>,
<span class="number">0</span>,
)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">composition_table</span>(<span class="ident">c1</span>: <span class="ident">char</span>, <span class="ident">c2</span>: <span class="ident">char</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">c1</span> <span class="op"><</span> <span class="string">'\u{10000}'</span> <span class="op">&&</span> <span class="ident">c2</span> <span class="op"><</span> <span class="string">'\u{10000}'</span> {
<span class="ident">mph_lookup</span>(
(<span class="ident">c1</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><</span><span class="op"><</span> <span class="number">16</span> <span class="op">|</span> (<span class="ident">c2</span> <span class="kw">as</span> <span class="ident">u32</span>),
<span class="ident">COMPOSITION_TABLE_SALT</span>,
<span class="ident">COMPOSITION_TABLE_KV</span>,
<span class="ident">pair_lookup_fk</span>,
<span class="ident">pair_lookup_fv_opt</span>,
<span class="prelude-val">None</span>,
)
} <span class="kw">else</span> {
<span class="ident">composition_table_astral</span>(<span class="ident">c1</span>, <span class="ident">c2</span>)
}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">canonical_fully_decomposed</span>(<span class="ident">c</span>: <span class="ident">char</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> [<span class="ident">char</span>]<span class="op">></span> {
<span class="ident">mph_lookup</span>(
<span class="ident">c</span>.<span class="ident">into</span>(),
<span class="ident">CANONICAL_DECOMPOSED_SALT</span>,
<span class="ident">CANONICAL_DECOMPOSED_KV</span>,
<span class="ident">pair_lookup_fk</span>,
<span class="ident">pair_lookup_fv_opt</span>,
<span class="prelude-val">None</span>,
)
.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">start</span>, <span class="ident">len</span>)<span class="op">|</span> <span class="kw-2">&</span><span class="ident">CANONICAL_DECOMPOSED_CHARS</span>[<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>..][..<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>])
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">compatibility_fully_decomposed</span>(<span class="ident">c</span>: <span class="ident">char</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> [<span class="ident">char</span>]<span class="op">></span> {
<span class="ident">mph_lookup</span>(
<span class="ident">c</span>.<span class="ident">into</span>(),
<span class="ident">COMPATIBILITY_DECOMPOSED_SALT</span>,
<span class="ident">COMPATIBILITY_DECOMPOSED_KV</span>,
<span class="ident">pair_lookup_fk</span>,
<span class="ident">pair_lookup_fv_opt</span>,
<span class="prelude-val">None</span>,
)
.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">start</span>, <span class="ident">len</span>)<span class="op">|</span> <span class="kw-2">&</span><span class="ident">COMPATIBILITY_DECOMPOSED_CHARS</span>[<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>..][..<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>])
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">cjk_compat_variants_fully_decomposed</span>(<span class="ident">c</span>: <span class="ident">char</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> [<span class="ident">char</span>]<span class="op">></span> {
<span class="ident">mph_lookup</span>(
<span class="ident">c</span>.<span class="ident">into</span>(),
<span class="ident">CJK_COMPAT_VARIANTS_DECOMPOSED_SALT</span>,
<span class="ident">CJK_COMPAT_VARIANTS_DECOMPOSED_KV</span>,
<span class="ident">pair_lookup_fk</span>,
<span class="ident">pair_lookup_fv_opt</span>,
<span class="prelude-val">None</span>,
)
.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">start</span>, <span class="ident">len</span>)<span class="op">|</span> <span class="kw-2">&</span><span class="ident">CJK_COMPAT_VARIANTS_DECOMPOSED_CHARS</span>[<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>..][..<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>])
}
<span class="doccomment">/// Return whether the given character is a combining mark (`General_Category=Mark`)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_combining_mark</span>(<span class="ident">c</span>: <span class="ident">char</span>) -> <span class="ident">bool</span> {
<span class="ident">mph_lookup</span>(
<span class="ident">c</span>.<span class="ident">into</span>(),
<span class="ident">COMBINING_MARK_SALT</span>,
<span class="ident">COMBINING_MARK_KV</span>,
<span class="ident">bool_lookup_fk</span>,
<span class="ident">bool_lookup_fv</span>,
<span class="bool-val">false</span>,
)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stream_safe_trailing_nonstarters</span>(<span class="ident">c</span>: <span class="ident">char</span>) -> <span class="ident">usize</span> {
<span class="ident">mph_lookup</span>(
<span class="ident">c</span>.<span class="ident">into</span>(),
<span class="ident">TRAILING_NONSTARTERS_SALT</span>,
<span class="ident">TRAILING_NONSTARTERS_KV</span>,
<span class="ident">u8_lookup_fk</span>,
<span class="ident">u8_lookup_fv</span>,
<span class="number">0</span>,
) <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="doccomment">/// Extract the key in a 24 bit key and 8 bit value packed in a u32.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">u8_lookup_fk</span>(<span class="ident">kv</span>: <span class="ident">u32</span>) -> <span class="ident">u32</span> {
<span class="ident">kv</span> <span class="op">></span><span class="op">></span> <span class="number">8</span>
}
<span class="doccomment">/// Extract the value in a 24 bit key and 8 bit value packed in a u32.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">u8_lookup_fv</span>(<span class="ident">kv</span>: <span class="ident">u32</span>) -> <span class="ident">u8</span> {
(<span class="ident">kv</span> <span class="op">&</span> <span class="number">0xff</span>) <span class="kw">as</span> <span class="ident">u8</span>
}
<span class="doccomment">/// Extract the key for a boolean lookup.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">bool_lookup_fk</span>(<span class="ident">kv</span>: <span class="ident">u32</span>) -> <span class="ident">u32</span> {
<span class="ident">kv</span>
}
<span class="doccomment">/// Extract the value for a boolean lookup.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">bool_lookup_fv</span>(<span class="ident">_kv</span>: <span class="ident">u32</span>) -> <span class="ident">bool</span> {
<span class="bool-val">true</span>
}
<span class="doccomment">/// Extract the key in a pair.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pair_lookup_fk</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">kv</span>: (<span class="ident">u32</span>, <span class="ident">T</span>)) -> <span class="ident">u32</span> {
<span class="ident">kv</span>.<span class="number">0</span>
}
<span class="doccomment">/// Extract the value in a pair, returning an option.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pair_lookup_fv_opt</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">kv</span>: (<span class="ident">u32</span>, <span class="ident">T</span>)) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="ident">kv</span>.<span class="number">1</span>)
}
</code></pre></div>
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