| <!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/unicode-normalization-0.1.22/src/quick_check.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>quick_check.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="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="sidebar"><a class="sidebar-logo" href="../../unicode_normalization/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::lookups::canonical_combining_class; |
| <span class="kw">use </span><span class="kw">crate</span>::stream_safe; |
| <span class="kw">use </span><span class="kw">crate</span>::tables; |
| <span class="kw">use </span><span class="kw">crate</span>::UnicodeNormalization; |
| |
| <span class="doccomment">/// The QuickCheck algorithm can quickly determine if a text is or isn't |
| /// normalized without any allocations in many cases, but it has to be able to |
| /// return `Maybe` when a full decomposition and recomposition is necessary. |
| </span><span class="attribute">#[derive(Debug, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>IsNormalized { |
| <span class="doccomment">/// The text is definitely normalized. |
| </span>Yes, |
| <span class="doccomment">/// The text is definitely not normalized. |
| </span>No, |
| <span class="doccomment">/// The text may be normalized. |
| </span>Maybe, |
| } |
| |
| <span class="comment">// https://unicode.org/reports/tr15/#Detecting_Normalization_Forms |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>quick_check<F, I>(s: I, is_allowed: F, stream_safe: bool) -> IsNormalized |
| <span class="kw">where |
| </span>I: Iterator<Item = char>, |
| F: Fn(char) -> IsNormalized, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>last_cc = <span class="number">0u8</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>nonstarter_count = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>result = IsNormalized::Yes; |
| <span class="kw">for </span>ch <span class="kw">in </span>s { |
| <span class="comment">// For ASCII we know it's always allowed and a starter |
| </span><span class="kw">if </span>ch <= <span class="string">'\x7f' </span>{ |
| last_cc = <span class="number">0</span>; |
| nonstarter_count = <span class="number">0</span>; |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="comment">// Otherwise, lookup the combining class and QC property |
| </span><span class="kw">let </span>cc = canonical_combining_class(ch); |
| <span class="kw">if </span>last_cc > cc && cc != <span class="number">0 </span>{ |
| <span class="kw">return </span>IsNormalized::No; |
| } |
| <span class="kw">match </span>is_allowed(ch) { |
| IsNormalized::Yes => (), |
| IsNormalized::No => <span class="kw">return </span>IsNormalized::No, |
| IsNormalized::Maybe => { |
| result = IsNormalized::Maybe; |
| } |
| } |
| <span class="kw">if </span>stream_safe { |
| <span class="kw">let </span>decomp = stream_safe::classify_nonstarters(ch); |
| |
| <span class="comment">// If we're above `MAX_NONSTARTERS`, we're definitely *not* |
| // stream-safe normalized. |
| </span><span class="kw">if </span>nonstarter_count + decomp.leading_nonstarters > stream_safe::MAX_NONSTARTERS { |
| <span class="kw">return </span>IsNormalized::No; |
| } |
| <span class="kw">if </span>decomp.leading_nonstarters == decomp.decomposition_len { |
| nonstarter_count += decomp.decomposition_len; |
| } <span class="kw">else </span>{ |
| nonstarter_count = decomp.trailing_nonstarters; |
| } |
| } |
| last_cc = cc; |
| } |
| result |
| } |
| |
| <span class="doccomment">/// Quickly check if a string is in NFC, potentially returning |
| /// `IsNormalized::Maybe` if further checks are necessary. In this case a check |
| /// like `s.chars().nfc().eq(s.chars())` should suffice. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfc_quick<I: Iterator<Item = char>>(s: I) -> IsNormalized { |
| quick_check(s, tables::qc_nfc, <span class="bool-val">false</span>) |
| } |
| |
| <span class="doccomment">/// Quickly check if a string is in NFKC. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfkc_quick<I: Iterator<Item = char>>(s: I) -> IsNormalized { |
| quick_check(s, tables::qc_nfkc, <span class="bool-val">false</span>) |
| } |
| |
| <span class="doccomment">/// Quickly check if a string is in NFD. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfd_quick<I: Iterator<Item = char>>(s: I) -> IsNormalized { |
| quick_check(s, tables::qc_nfd, <span class="bool-val">false</span>) |
| } |
| |
| <span class="doccomment">/// Quickly check if a string is in NFKD. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfkd_quick<I: Iterator<Item = char>>(s: I) -> IsNormalized { |
| quick_check(s, tables::qc_nfkd, <span class="bool-val">false</span>) |
| } |
| |
| <span class="doccomment">/// Quickly check if a string is Stream-Safe NFC. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfc_stream_safe_quick<I: Iterator<Item = char>>(s: I) -> IsNormalized { |
| quick_check(s, tables::qc_nfc, <span class="bool-val">true</span>) |
| } |
| |
| <span class="doccomment">/// Quickly check if a string is Stream-Safe NFD. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfd_stream_safe_quick<I: Iterator<Item = char>>(s: I) -> IsNormalized { |
| quick_check(s, tables::qc_nfd, <span class="bool-val">true</span>) |
| } |
| |
| <span class="doccomment">/// Authoritatively check if a string is in NFC. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfc(s: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>is_nfc_quick(s.chars()) { |
| IsNormalized::Yes => <span class="bool-val">true</span>, |
| IsNormalized::No => <span class="bool-val">false</span>, |
| IsNormalized::Maybe => s.chars().eq(s.chars().nfc()), |
| } |
| } |
| |
| <span class="doccomment">/// Authoritatively check if a string is in NFKC. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfkc(s: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>is_nfkc_quick(s.chars()) { |
| IsNormalized::Yes => <span class="bool-val">true</span>, |
| IsNormalized::No => <span class="bool-val">false</span>, |
| IsNormalized::Maybe => s.chars().eq(s.chars().nfkc()), |
| } |
| } |
| |
| <span class="doccomment">/// Authoritatively check if a string is in NFD. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfd(s: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>is_nfd_quick(s.chars()) { |
| IsNormalized::Yes => <span class="bool-val">true</span>, |
| IsNormalized::No => <span class="bool-val">false</span>, |
| IsNormalized::Maybe => s.chars().eq(s.chars().nfd()), |
| } |
| } |
| |
| <span class="doccomment">/// Authoritatively check if a string is in NFKD. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfkd(s: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>is_nfkd_quick(s.chars()) { |
| IsNormalized::Yes => <span class="bool-val">true</span>, |
| IsNormalized::No => <span class="bool-val">false</span>, |
| IsNormalized::Maybe => s.chars().eq(s.chars().nfkd()), |
| } |
| } |
| |
| <span class="doccomment">/// Authoritatively check if a string is Stream-Safe NFC. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfc_stream_safe(s: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>is_nfc_stream_safe_quick(s.chars()) { |
| IsNormalized::Yes => <span class="bool-val">true</span>, |
| IsNormalized::No => <span class="bool-val">false</span>, |
| IsNormalized::Maybe => s.chars().eq(s.chars().stream_safe().nfc()), |
| } |
| } |
| |
| <span class="doccomment">/// Authoritatively check if a string is Stream-Safe NFD. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_nfd_stream_safe(s: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>is_nfd_stream_safe_quick(s.chars()) { |
| IsNormalized::Yes => <span class="bool-val">true</span>, |
| IsNormalized::No => <span class="bool-val">false</span>, |
| IsNormalized::Maybe => s.chars().eq(s.chars().stream_safe().nfd()), |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::{is_nfc_stream_safe_quick, is_nfd_stream_safe_quick, IsNormalized}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_stream_safe_nfd() { |
| <span class="kw">let </span>okay = <span class="string">"Da\u{031b}\u{0316}\u{0317}\u{0318}\u{0319}\u{031c}\u{031d}\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{031a}ngerzone"</span>; |
| <span class="macro">assert_eq!</span>(is_nfd_stream_safe_quick(okay.chars()), IsNormalized::Yes); |
| |
| <span class="kw">let </span>too_much = <span class="string">"Da\u{031b}\u{0316}\u{0317}\u{0318}\u{0319}\u{031c}\u{031d}\u{031e}\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{031a}ngerzone"</span>; |
| <span class="macro">assert_eq!</span>(is_nfd_stream_safe_quick(too_much.chars()), IsNormalized::No); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_stream_safe_nfc() { |
| <span class="kw">let </span>okay = <span class="string">"ok\u{e0}\u{031b}\u{0316}\u{0317}\u{0318}\u{0319}\u{031c}\u{031d}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{031a}y"</span>; |
| <span class="macro">assert_eq!</span>(is_nfc_stream_safe_quick(okay.chars()), IsNormalized::Maybe); |
| |
| <span class="kw">let </span>too_much = <span class="string">"not ok\u{e0}\u{031b}\u{0316}\u{0317}\u{0318}\u{0319}\u{031c}\u{031d}\u{031e}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{031a}y"</span>; |
| <span class="macro">assert_eq!</span>(is_nfc_stream_safe_quick(too_much.chars()), IsNormalized::No); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="unicode_normalization" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
