| <!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/regex-syntax-0.7.2/src/unicode.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>unicode.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="../../regex_syntax/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="../../regex_syntax/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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| <span id="611">611</span> |
| <span id="612">612</span> |
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| <span id="628">628</span> |
| <span id="629">629</span> |
| <span id="630">630</span> |
| <span id="631">631</span> |
| <span id="632">632</span> |
| <span id="633">633</span> |
| <span id="634">634</span> |
| <span id="635">635</span> |
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| <span id="740">740</span> |
| <span id="741">741</span> |
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| <span id="744">744</span> |
| <span id="745">745</span> |
| <span id="746">746</span> |
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| <span id="749">749</span> |
| <span id="750">750</span> |
| <span id="751">751</span> |
| <span id="752">752</span> |
| <span id="753">753</span> |
| <span id="754">754</span> |
| <span id="755">755</span> |
| <span id="756">756</span> |
| <span id="757">757</span> |
| <span id="758">758</span> |
| <span id="759">759</span> |
| <span id="760">760</span> |
| <span id="761">761</span> |
| <span id="762">762</span> |
| <span id="763">763</span> |
| <span id="764">764</span> |
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| <span id="827">827</span> |
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| <span id="829">829</span> |
| <span id="830">830</span> |
| <span id="831">831</span> |
| <span id="832">832</span> |
| <span id="833">833</span> |
| <span id="834">834</span> |
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| <span id="838">838</span> |
| <span id="839">839</span> |
| <span id="840">840</span> |
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| <span id="842">842</span> |
| <span id="843">843</span> |
| <span id="844">844</span> |
| <span id="845">845</span> |
| <span id="846">846</span> |
| <span id="847">847</span> |
| <span id="848">848</span> |
| <span id="849">849</span> |
| <span id="850">850</span> |
| <span id="851">851</span> |
| <span id="852">852</span> |
| <span id="853">853</span> |
| <span id="854">854</span> |
| <span id="855">855</span> |
| <span id="856">856</span> |
| <span id="857">857</span> |
| <span id="858">858</span> |
| <span id="859">859</span> |
| <span id="860">860</span> |
| <span id="861">861</span> |
| <span id="862">862</span> |
| <span id="863">863</span> |
| <span id="864">864</span> |
| <span id="865">865</span> |
| <span id="866">866</span> |
| <span id="867">867</span> |
| <span id="868">868</span> |
| <span id="869">869</span> |
| <span id="870">870</span> |
| <span id="871">871</span> |
| <span id="872">872</span> |
| <span id="873">873</span> |
| <span id="874">874</span> |
| <span id="875">875</span> |
| <span id="876">876</span> |
| <span id="877">877</span> |
| <span id="878">878</span> |
| <span id="879">879</span> |
| <span id="880">880</span> |
| <span id="881">881</span> |
| <span id="882">882</span> |
| <span id="883">883</span> |
| <span id="884">884</span> |
| <span id="885">885</span> |
| <span id="886">886</span> |
| <span id="887">887</span> |
| <span id="888">888</span> |
| <span id="889">889</span> |
| <span id="890">890</span> |
| <span id="891">891</span> |
| <span id="892">892</span> |
| <span id="893">893</span> |
| <span id="894">894</span> |
| <span id="895">895</span> |
| <span id="896">896</span> |
| <span id="897">897</span> |
| <span id="898">898</span> |
| <span id="899">899</span> |
| <span id="900">900</span> |
| <span id="901">901</span> |
| <span id="902">902</span> |
| <span id="903">903</span> |
| <span id="904">904</span> |
| <span id="905">905</span> |
| <span id="906">906</span> |
| <span id="907">907</span> |
| <span id="908">908</span> |
| <span id="909">909</span> |
| <span id="910">910</span> |
| <span id="911">911</span> |
| <span id="912">912</span> |
| <span id="913">913</span> |
| <span id="914">914</span> |
| <span id="915">915</span> |
| <span id="916">916</span> |
| <span id="917">917</span> |
| <span id="918">918</span> |
| <span id="919">919</span> |
| <span id="920">920</span> |
| <span id="921">921</span> |
| <span id="922">922</span> |
| <span id="923">923</span> |
| <span id="924">924</span> |
| <span id="925">925</span> |
| <span id="926">926</span> |
| <span id="927">927</span> |
| <span id="928">928</span> |
| <span id="929">929</span> |
| <span id="930">930</span> |
| <span id="931">931</span> |
| <span id="932">932</span> |
| <span id="933">933</span> |
| <span id="934">934</span> |
| <span id="935">935</span> |
| <span id="936">936</span> |
| <span id="937">937</span> |
| <span id="938">938</span> |
| <span id="939">939</span> |
| <span id="940">940</span> |
| <span id="941">941</span> |
| <span id="942">942</span> |
| <span id="943">943</span> |
| <span id="944">944</span> |
| <span id="945">945</span> |
| <span id="946">946</span> |
| <span id="947">947</span> |
| <span id="948">948</span> |
| <span id="949">949</span> |
| <span id="950">950</span> |
| <span id="951">951</span> |
| <span id="952">952</span> |
| <span id="953">953</span> |
| <span id="954">954</span> |
| <span id="955">955</span> |
| <span id="956">956</span> |
| <span id="957">957</span> |
| <span id="958">958</span> |
| <span id="959">959</span> |
| <span id="960">960</span> |
| <span id="961">961</span> |
| <span id="962">962</span> |
| <span id="963">963</span> |
| <span id="964">964</span> |
| <span id="965">965</span> |
| <span id="966">966</span> |
| <span id="967">967</span> |
| <span id="968">968</span> |
| <span id="969">969</span> |
| <span id="970">970</span> |
| <span id="971">971</span> |
| <span id="972">972</span> |
| <span id="973">973</span> |
| <span id="974">974</span> |
| <span id="975">975</span> |
| <span id="976">976</span> |
| <span id="977">977</span> |
| <span id="978">978</span> |
| <span id="979">979</span> |
| <span id="980">980</span> |
| <span id="981">981</span> |
| <span id="982">982</span> |
| <span id="983">983</span> |
| <span id="984">984</span> |
| <span id="985">985</span> |
| <span id="986">986</span> |
| <span id="987">987</span> |
| <span id="988">988</span> |
| <span id="989">989</span> |
| <span id="990">990</span> |
| <span id="991">991</span> |
| <span id="992">992</span> |
| <span id="993">993</span> |
| <span id="994">994</span> |
| <span id="995">995</span> |
| <span id="996">996</span> |
| <span id="997">997</span> |
| <span id="998">998</span> |
| <span id="999">999</span> |
| <span id="1000">1000</span> |
| <span id="1001">1001</span> |
| <span id="1002">1002</span> |
| <span id="1003">1003</span> |
| <span id="1004">1004</span> |
| <span id="1005">1005</span> |
| <span id="1006">1006</span> |
| <span id="1007">1007</span> |
| <span id="1008">1008</span> |
| <span id="1009">1009</span> |
| <span id="1010">1010</span> |
| <span id="1011">1011</span> |
| <span id="1012">1012</span> |
| <span id="1013">1013</span> |
| <span id="1014">1014</span> |
| <span id="1015">1015</span> |
| <span id="1016">1016</span> |
| <span id="1017">1017</span> |
| <span id="1018">1018</span> |
| <span id="1019">1019</span> |
| <span id="1020">1020</span> |
| <span id="1021">1021</span> |
| <span id="1022">1022</span> |
| <span id="1023">1023</span> |
| <span id="1024">1024</span> |
| <span id="1025">1025</span> |
| <span id="1026">1026</span> |
| <span id="1027">1027</span> |
| <span id="1028">1028</span> |
| <span id="1029">1029</span> |
| <span id="1030">1030</span> |
| <span id="1031">1031</span> |
| <span id="1032">1032</span> |
| <span id="1033">1033</span> |
| <span id="1034">1034</span> |
| <span id="1035">1035</span> |
| <span id="1036">1036</span> |
| <span id="1037">1037</span> |
| <span id="1038">1038</span> |
| <span id="1039">1039</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>alloc::{ |
| string::{String, ToString}, |
| vec::Vec, |
| }; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::hir; |
| |
| <span class="doccomment">/// An inclusive range of codepoints from a generated file (hence the static |
| /// lifetime). |
| </span><span class="kw">type </span>Range = <span class="kw-2">&</span><span class="lifetime">'static </span>[(char, char)]; |
| |
| <span class="doccomment">/// An error that occurs when dealing with Unicode. |
| /// |
| /// We don't impl the Error trait here because these always get converted |
| /// into other public errors. (This error type isn't exported.) |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub enum </span>Error { |
| PropertyNotFound, |
| PropertyValueNotFound, |
| <span class="comment">// Not used when unicode-perl is enabled. |
| </span><span class="attribute">#[allow(dead_code)] |
| </span>PerlClassNotFound, |
| } |
| |
| <span class="doccomment">/// An error that occurs when Unicode-aware simple case folding fails. |
| /// |
| /// This error can occur when the case mapping tables necessary for Unicode |
| /// aware case folding are unavailable. This only occurs when the |
| /// `unicode-case` feature is disabled. (The feature is enabled by default.) |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>CaseFoldError(()); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>CaseFoldError {} |
| |
| <span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>CaseFoldError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="macro">write!</span>( |
| f, |
| <span class="string">"Unicode-aware case folding is not available \ |
| (probably because the unicode-case feature is not enabled)" |
| </span>) |
| } |
| } |
| |
| <span class="doccomment">/// An error that occurs when the Unicode-aware `\w` class is unavailable. |
| /// |
| /// This error can occur when the data tables necessary for the Unicode aware |
| /// Perl character class `\w` are unavailable. This only occurs when the |
| /// `unicode-perl` feature is disabled. (The feature is enabled by default.) |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>UnicodeWordError(()); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>UnicodeWordError {} |
| |
| <span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>UnicodeWordError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="macro">write!</span>( |
| f, |
| <span class="string">"Unicode-aware \\w class is not available \ |
| (probably because the unicode-perl feature is not enabled)" |
| </span>) |
| } |
| } |
| |
| <span class="doccomment">/// A state oriented traverser of the simple case folding table. |
| /// |
| /// A case folder can be constructed via `SimpleCaseFolder::new()`, which will |
| /// return an error if the underlying case folding table is unavailable. |
| /// |
| /// After construction, it is expected that callers will use |
| /// `SimpleCaseFolder::mapping` by calling it with codepoints in strictly |
| /// increasing order. For example, calling it on `b` and then on `a` is illegal |
| /// and will result in a panic. |
| /// |
| /// The main idea of this type is that it tries hard to make mapping lookups |
| /// fast by exploiting the structure of the underlying table, and the ordering |
| /// assumption enables this. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>SimpleCaseFolder { |
| <span class="doccomment">/// The simple case fold table. It's a sorted association list, where the |
| /// keys are Unicode scalar values and the values are the corresponding |
| /// equivalence class (not including the key) of the "simple" case folded |
| /// Unicode scalar values. |
| </span>table: <span class="kw-2">&</span><span class="lifetime">'static </span>[(char, <span class="kw-2">&</span><span class="lifetime">'static </span>[char])], |
| <span class="doccomment">/// The last codepoint that was used for a lookup. |
| </span>last: <span class="prelude-ty">Option</span><char>, |
| <span class="doccomment">/// The index to the entry in `table` corresponding to the smallest key `k` |
| /// such that `k > k0`, where `k0` is the most recent key lookup. Note that |
| /// in particular, `k0` may not be in the table! |
| </span>next: usize, |
| } |
| |
| <span class="kw">impl </span>SimpleCaseFolder { |
| <span class="doccomment">/// Create a new simple case folder, returning an error if the underlying |
| /// case folding table is unavailable. |
| </span><span class="kw">pub fn </span>new() -> <span class="prelude-ty">Result</span><SimpleCaseFolder, CaseFoldError> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-case"</span>))] |
| </span>{ |
| <span class="prelude-val">Err</span>(CaseFoldError(())) |
| } |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span>{ |
| <span class="prelude-val">Ok</span>(SimpleCaseFolder { |
| table: <span class="kw">crate</span>::unicode_tables::case_folding_simple::CASE_FOLDING_SIMPLE, |
| last: <span class="prelude-val">None</span>, |
| next: <span class="number">0</span>, |
| }) |
| } |
| } |
| |
| <span class="doccomment">/// Return the equivalence class of case folded codepoints for the given |
| /// codepoint. The equivalence class returned never includes the codepoint |
| /// given. If the given codepoint has no case folded codepoints (i.e., |
| /// no entry in the underlying case folding table), then this returns an |
| /// empty slice. |
| /// |
| /// # Panics |
| /// |
| /// This panics when called with a `c` that is less than or equal to the |
| /// previous call. In other words, callers need to use this method with |
| /// strictly increasing values of `c`. |
| </span><span class="kw">pub fn </span>mapping(<span class="kw-2">&mut </span><span class="self">self</span>, c: char) -> <span class="kw-2">&</span><span class="lifetime">'static </span>[char] { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(last) = <span class="self">self</span>.last { |
| <span class="macro">assert!</span>( |
| last < c, |
| <span class="string">"got codepoint U+{:X} which occurs before \ |
| last codepoint U+{:X}"</span>, |
| u32::from(c), |
| u32::from(last), |
| ); |
| } |
| <span class="self">self</span>.last = <span class="prelude-val">Some</span>(c); |
| <span class="kw">if </span><span class="self">self</span>.next >= <span class="self">self</span>.table.len() { |
| <span class="kw">return </span><span class="kw-2">&</span>[]; |
| } |
| <span class="kw">let </span>(k, v) = <span class="self">self</span>.table[<span class="self">self</span>.next]; |
| <span class="kw">if </span>k == c { |
| <span class="self">self</span>.next += <span class="number">1</span>; |
| <span class="kw">return </span>v; |
| } |
| <span class="kw">match </span><span class="self">self</span>.get(c) { |
| <span class="prelude-val">Err</span>(i) => { |
| <span class="self">self</span>.next = i; |
| <span class="kw-2">&</span>[] |
| } |
| <span class="prelude-val">Ok</span>(i) => { |
| <span class="comment">// Since we require lookups to proceed |
| // in order, anything we find should be |
| // after whatever we thought might be |
| // next. Otherwise, the caller is either |
| // going out of order or we would have |
| // found our next key at 'self.next'. |
| </span><span class="macro">assert!</span>(i > <span class="self">self</span>.next); |
| <span class="self">self</span>.next = i + <span class="number">1</span>; |
| <span class="self">self</span>.table[i].<span class="number">1 |
| </span>} |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the given range overlaps with any region |
| /// of the underlying case folding table. That is, when true, there exists |
| /// at least one codepoint in the inclusive range `[start, end]` that has |
| /// a non-trivial equivalence class of case folded codepoints. Conversely, |
| /// when this returns false, all codepoints in the range `[start, end]` |
| /// correspond to the trivial equivalence class of case folded codepoints, |
| /// i.e., itself. |
| /// |
| /// This is useful to call before iterating over the codepoints in the |
| /// range and looking up the mapping for each. If you know none of the |
| /// mappings will return anything, then you might be able to skip doing it |
| /// altogether. |
| /// |
| /// # Panics |
| /// |
| /// This panics when `end < start`. |
| </span><span class="kw">pub fn </span>overlaps(<span class="kw-2">&</span><span class="self">self</span>, start: char, end: char) -> bool { |
| <span class="kw">use </span>core::cmp::Ordering; |
| |
| <span class="macro">assert!</span>(start <= end); |
| <span class="self">self</span>.table |
| .binary_search_by(|<span class="kw-2">&</span>(c, <span class="kw">_</span>)| { |
| <span class="kw">if </span>start <= c && c <= end { |
| Ordering::Equal |
| } <span class="kw">else if </span>c > end { |
| Ordering::Greater |
| } <span class="kw">else </span>{ |
| Ordering::Less |
| } |
| }) |
| .is_ok() |
| } |
| |
| <span class="doccomment">/// Returns the index at which `c` occurs in the simple case fold table. If |
| /// `c` does not occur, then this returns an `i` such that `table[i-1].0 < |
| /// c` and `table[i].0 > c`. |
| </span><span class="kw">fn </span>get(<span class="kw-2">&</span><span class="self">self</span>, c: char) -> <span class="prelude-ty">Result</span><usize, usize> { |
| <span class="self">self</span>.table.binary_search_by_key(<span class="kw-2">&</span>c, |<span class="kw-2">&</span>(c1, <span class="kw">_</span>)| c1) |
| } |
| } |
| |
| <span class="doccomment">/// A query for finding a character class defined by Unicode. This supports |
| /// either use of a property name directly, or lookup by property value. The |
| /// former generally refers to Binary properties (see UTS#44, Table 8), but |
| /// as a special exception (see UTS#18, Section 1.2) both general categories |
| /// (an enumeration) and scripts (a catalog) are supported as if each of their |
| /// possible values were a binary property. |
| /// |
| /// In all circumstances, property names and values are normalized and |
| /// canonicalized. That is, `GC == gc == GeneralCategory == general_category`. |
| /// |
| /// The lifetime `'a` refers to the shorter of the lifetimes of property name |
| /// and property value. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub enum </span>ClassQuery<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Return a class corresponding to a Unicode binary property, named by |
| /// a single letter. |
| </span>OneLetter(char), |
| <span class="doccomment">/// Return a class corresponding to a Unicode binary property. |
| /// |
| /// Note that, by special exception (see UTS#18, Section 1.2), both |
| /// general category values and script values are permitted here as if |
| /// they were a binary property. |
| </span>Binary(<span class="kw-2">&</span><span class="lifetime">'a </span>str), |
| <span class="doccomment">/// Return a class corresponding to all codepoints whose property |
| /// (identified by `property_name`) corresponds to the given value |
| /// (identified by `property_value`). |
| </span>ByValue { |
| <span class="doccomment">/// A property name. |
| </span>property_name: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| <span class="doccomment">/// A property value. |
| </span>property_value: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| }, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> ClassQuery<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>canonicalize(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><CanonicalClassQuery, Error> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| ClassQuery::OneLetter(c) => <span class="self">self</span>.canonical_binary(<span class="kw-2">&</span>c.to_string()), |
| ClassQuery::Binary(name) => <span class="self">self</span>.canonical_binary(name), |
| ClassQuery::ByValue { property_name, property_value } => { |
| <span class="kw">let </span>property_name = symbolic_name_normalize(property_name); |
| <span class="kw">let </span>property_value = symbolic_name_normalize(property_value); |
| |
| <span class="kw">let </span>canon_name = <span class="kw">match </span>canonical_prop(<span class="kw-2">&</span>property_name)<span class="question-mark">? </span>{ |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::PropertyNotFound), |
| <span class="prelude-val">Some</span>(canon_name) => canon_name, |
| }; |
| <span class="prelude-val">Ok</span>(<span class="kw">match </span>canon_name { |
| <span class="string">"General_Category" </span>=> { |
| <span class="kw">let </span>canon = <span class="kw">match </span>canonical_gencat(<span class="kw-2">&</span>property_value)<span class="question-mark">? </span>{ |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::PropertyValueNotFound), |
| <span class="prelude-val">Some</span>(canon) => canon, |
| }; |
| CanonicalClassQuery::GeneralCategory(canon) |
| } |
| <span class="string">"Script" </span>=> { |
| <span class="kw">let </span>canon = <span class="kw">match </span>canonical_script(<span class="kw-2">&</span>property_value)<span class="question-mark">? </span>{ |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::PropertyValueNotFound), |
| <span class="prelude-val">Some</span>(canon) => canon, |
| }; |
| CanonicalClassQuery::Script(canon) |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>vals = <span class="kw">match </span>property_values(canon_name)<span class="question-mark">? </span>{ |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::PropertyValueNotFound), |
| <span class="prelude-val">Some</span>(vals) => vals, |
| }; |
| <span class="kw">let </span>canon_val = |
| <span class="kw">match </span>canonical_value(vals, <span class="kw-2">&</span>property_value) { |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::PropertyValueNotFound) |
| } |
| <span class="prelude-val">Some</span>(canon_val) => canon_val, |
| }; |
| CanonicalClassQuery::ByValue { |
| property_name: canon_name, |
| property_value: canon_val, |
| } |
| } |
| }) |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>canonical_binary( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| name: <span class="kw-2">&</span>str, |
| ) -> <span class="prelude-ty">Result</span><CanonicalClassQuery, Error> { |
| <span class="kw">let </span>norm = symbolic_name_normalize(name); |
| |
| <span class="comment">// This is a special case where 'cf' refers to the 'Format' general |
| // category, but where the 'cf' abbreviation is also an abbreviation |
| // for the 'Case_Folding' property. But we want to treat it as |
| // a general category. (Currently, we don't even support the |
| // 'Case_Folding' property. But if we do in the future, users will be |
| // required to spell it out.) |
| // |
| // Also 'sc' refers to the 'Currency_Symbol' general category, but is |
| // also the abbreviation for the 'Script' property. So we avoid calling |
| // 'canonical_prop' for it too, which would erroneously normalize it |
| // to 'Script'. |
| // |
| // Another case: 'lc' is an abbreviation for the 'Cased_Letter' |
| // general category, but is also an abbreviation for the 'Lowercase_Mapping' |
| // property. We don't currently support the latter, so as with 'cf' |
| // above, we treat 'lc' as 'Cased_Letter'. |
| </span><span class="kw">if </span>norm != <span class="string">"cf" </span>&& norm != <span class="string">"sc" </span>&& norm != <span class="string">"lc" </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(canon) = canonical_prop(<span class="kw-2">&</span>norm)<span class="question-mark">? </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(CanonicalClassQuery::Binary(canon)); |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(canon) = canonical_gencat(<span class="kw-2">&</span>norm)<span class="question-mark">? </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(CanonicalClassQuery::GeneralCategory(canon)); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(canon) = canonical_script(<span class="kw-2">&</span>norm)<span class="question-mark">? </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(CanonicalClassQuery::Script(canon)); |
| } |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| } |
| |
| <span class="doccomment">/// Like ClassQuery, but its parameters have been canonicalized. This also |
| /// differentiates binary properties from flattened general categories and |
| /// scripts. |
| </span><span class="attribute">#[derive(Debug, Eq, PartialEq)] |
| </span><span class="kw">enum </span>CanonicalClassQuery { |
| <span class="doccomment">/// The canonical binary property name. |
| </span>Binary(<span class="kw-2">&</span><span class="lifetime">'static </span>str), |
| <span class="doccomment">/// The canonical general category name. |
| </span>GeneralCategory(<span class="kw-2">&</span><span class="lifetime">'static </span>str), |
| <span class="doccomment">/// The canonical script name. |
| </span>Script(<span class="kw-2">&</span><span class="lifetime">'static </span>str), |
| <span class="doccomment">/// An arbitrary association between property and value, both of which |
| /// have been canonicalized. |
| /// |
| /// Note that by construction, the property name of ByValue will never |
| /// be General_Category or Script. Those two cases are subsumed by the |
| /// eponymous variants. |
| </span>ByValue { |
| <span class="doccomment">/// The canonical property name. |
| </span>property_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| <span class="doccomment">/// The canonical property value. |
| </span>property_value: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| }, |
| } |
| |
| <span class="doccomment">/// Looks up a Unicode class given a query. If one doesn't exist, then |
| /// `None` is returned. |
| </span><span class="kw">pub fn </span>class(query: ClassQuery<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="self">self</span>::CanonicalClassQuery::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span>query.canonicalize()<span class="question-mark">? </span>{ |
| Binary(name) => bool_property(name), |
| GeneralCategory(name) => gencat(name), |
| Script(name) => script(name), |
| ByValue { property_name: <span class="string">"Age"</span>, property_value } => { |
| <span class="kw">let </span><span class="kw-2">mut </span>class = hir::ClassUnicode::empty(); |
| <span class="kw">for </span>set <span class="kw">in </span>ages(property_value)<span class="question-mark">? </span>{ |
| class.union(<span class="kw-2">&</span>hir_class(set)); |
| } |
| <span class="prelude-val">Ok</span>(class) |
| } |
| ByValue { property_name: <span class="string">"Script_Extensions"</span>, property_value } => { |
| script_extension(property_value) |
| } |
| ByValue { |
| property_name: <span class="string">"Grapheme_Cluster_Break"</span>, |
| property_value, |
| } => gcb(property_value), |
| ByValue { property_name: <span class="string">"Sentence_Break"</span>, property_value } => { |
| sb(property_value) |
| } |
| ByValue { property_name: <span class="string">"Word_Break"</span>, property_value } => { |
| wb(property_value) |
| } |
| <span class="kw">_ </span>=> { |
| <span class="comment">// What else should we support? |
| </span><span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Returns a Unicode aware class for \w. |
| /// |
| /// This returns an error if the data is not available for \w. |
| </span><span class="kw">pub fn </span>perl_word() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-perl"</span>))] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PerlClassNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-perl"</span>)] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::perl_word::PERL_WORD; |
| <span class="prelude-val">Ok</span>(hir_class(PERL_WORD)) |
| } |
| |
| imp() |
| } |
| |
| <span class="doccomment">/// Returns a Unicode aware class for \s. |
| /// |
| /// This returns an error if the data is not available for \s. |
| </span><span class="kw">pub fn </span>perl_space() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(any(feature = <span class="string">"unicode-perl"</span>, feature = <span class="string">"unicode-bool"</span>)))] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PerlClassNotFound) |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"unicode-perl"</span>, not(feature = <span class="string">"unicode-bool"</span>)))] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::perl_space::WHITE_SPACE; |
| <span class="prelude-val">Ok</span>(hir_class(WHITE_SPACE)) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-bool"</span>)] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::property_bool::WHITE_SPACE; |
| <span class="prelude-val">Ok</span>(hir_class(WHITE_SPACE)) |
| } |
| |
| imp() |
| } |
| |
| <span class="doccomment">/// Returns a Unicode aware class for \d. |
| /// |
| /// This returns an error if the data is not available for \d. |
| </span><span class="kw">pub fn </span>perl_digit() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(any(feature = <span class="string">"unicode-perl"</span>, feature = <span class="string">"unicode-gencat"</span>)))] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PerlClassNotFound) |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"unicode-perl"</span>, not(feature = <span class="string">"unicode-gencat"</span>)))] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::perl_decimal::DECIMAL_NUMBER; |
| <span class="prelude-val">Ok</span>(hir_class(DECIMAL_NUMBER)) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-gencat"</span>)] |
| </span><span class="kw">fn </span>imp() -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::general_category::DECIMAL_NUMBER; |
| <span class="prelude-val">Ok</span>(hir_class(DECIMAL_NUMBER)) |
| } |
| |
| imp() |
| } |
| |
| <span class="doccomment">/// Build a Unicode HIR class from a sequence of Unicode scalar value ranges. |
| </span><span class="kw">pub fn </span>hir_class(ranges: <span class="kw-2">&</span>[(char, char)]) -> hir::ClassUnicode { |
| <span class="kw">let </span>hir_ranges: Vec<hir::ClassUnicodeRange> = ranges |
| .iter() |
| .map(|<span class="kw-2">&</span>(s, e)| hir::ClassUnicodeRange::new(s, e)) |
| .collect(); |
| hir::ClassUnicode::new(hir_ranges) |
| } |
| |
| <span class="doccomment">/// Returns true only if the given codepoint is in the `\w` character class. |
| /// |
| /// If the `unicode-perl` feature is not enabled, then this returns an error. |
| </span><span class="kw">pub fn </span>is_word_character(c: char) -> <span class="prelude-ty">Result</span><bool, UnicodeWordError> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-perl"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: char) -> <span class="prelude-ty">Result</span><bool, UnicodeWordError> { |
| <span class="prelude-val">Err</span>(UnicodeWordError(())) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-perl"</span>)] |
| </span><span class="kw">fn </span>imp(c: char) -> <span class="prelude-ty">Result</span><bool, UnicodeWordError> { |
| <span class="kw">use crate</span>::{is_word_byte, unicode_tables::perl_word::PERL_WORD}; |
| |
| <span class="kw">if </span>u8::try_from(c).map_or(<span class="bool-val">false</span>, is_word_byte) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">true</span>); |
| } |
| <span class="prelude-val">Ok</span>(PERL_WORD |
| .binary_search_by(|<span class="kw-2">&</span>(start, end)| { |
| <span class="kw">use </span>core::cmp::Ordering; |
| |
| <span class="kw">if </span>start <= c && c <= end { |
| Ordering::Equal |
| } <span class="kw">else if </span>start > c { |
| Ordering::Greater |
| } <span class="kw">else </span>{ |
| Ordering::Less |
| } |
| }) |
| .is_ok()) |
| } |
| |
| imp(c) |
| } |
| |
| <span class="doccomment">/// A mapping of property values for a specific property. |
| /// |
| /// The first element of each tuple is a normalized property value while the |
| /// second element of each tuple is the corresponding canonical property |
| /// value. |
| </span><span class="kw">type </span>PropertyValues = <span class="kw-2">&</span><span class="lifetime">'static </span>[(<span class="kw-2">&</span><span class="lifetime">'static </span>str, <span class="kw-2">&</span><span class="lifetime">'static </span>str)]; |
| |
| <span class="kw">fn </span>canonical_gencat( |
| normalized_value: <span class="kw-2">&</span>str, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>str>, Error> { |
| <span class="prelude-val">Ok</span>(<span class="kw">match </span>normalized_value { |
| <span class="string">"any" </span>=> <span class="prelude-val">Some</span>(<span class="string">"Any"</span>), |
| <span class="string">"assigned" </span>=> <span class="prelude-val">Some</span>(<span class="string">"Assigned"</span>), |
| <span class="string">"ascii" </span>=> <span class="prelude-val">Some</span>(<span class="string">"ASCII"</span>), |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>gencats = property_values(<span class="string">"General_Category"</span>)<span class="question-mark">?</span>.unwrap(); |
| canonical_value(gencats, normalized_value) |
| } |
| }) |
| } |
| |
| <span class="kw">fn </span>canonical_script( |
| normalized_value: <span class="kw-2">&</span>str, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>str>, Error> { |
| <span class="kw">let </span>scripts = property_values(<span class="string">"Script"</span>)<span class="question-mark">?</span>.unwrap(); |
| <span class="prelude-val">Ok</span>(canonical_value(scripts, normalized_value)) |
| } |
| |
| <span class="doccomment">/// Find the canonical property name for the given normalized property name. |
| /// |
| /// If no such property exists, then `None` is returned. |
| /// |
| /// The normalized property name must have been normalized according to |
| /// UAX44 LM3, which can be done using `symbolic_name_normalize`. |
| /// |
| /// If the property names data is not available, then an error is returned. |
| </span><span class="kw">fn </span>canonical_prop( |
| normalized_name: <span class="kw-2">&</span>str, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>str>, Error> { |
| <span class="attribute">#[cfg(not(any( |
| feature = <span class="string">"unicode-age"</span>, |
| feature = <span class="string">"unicode-bool"</span>, |
| feature = <span class="string">"unicode-gencat"</span>, |
| feature = <span class="string">"unicode-perl"</span>, |
| feature = <span class="string">"unicode-script"</span>, |
| feature = <span class="string">"unicode-segment"</span>, |
| )))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>str>, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(any( |
| feature = <span class="string">"unicode-age"</span>, |
| feature = <span class="string">"unicode-bool"</span>, |
| feature = <span class="string">"unicode-gencat"</span>, |
| feature = <span class="string">"unicode-perl"</span>, |
| feature = <span class="string">"unicode-script"</span>, |
| feature = <span class="string">"unicode-segment"</span>, |
| ))] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>str>, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::property_names::PROPERTY_NAMES; |
| |
| <span class="prelude-val">Ok</span>(PROPERTY_NAMES |
| .binary_search_by_key(<span class="kw-2">&</span>name, |<span class="kw-2">&</span>(n, <span class="kw">_</span>)| n) |
| .ok() |
| .map(|i| PROPERTY_NAMES[i].<span class="number">1</span>)) |
| } |
| |
| imp(normalized_name) |
| } |
| |
| <span class="doccomment">/// Find the canonical property value for the given normalized property |
| /// value. |
| /// |
| /// The given property values should correspond to the values for the property |
| /// under question, which can be found using `property_values`. |
| /// |
| /// If no such property value exists, then `None` is returned. |
| /// |
| /// The normalized property value must have been normalized according to |
| /// UAX44 LM3, which can be done using `symbolic_name_normalize`. |
| </span><span class="kw">fn </span>canonical_value( |
| vals: PropertyValues, |
| normalized_value: <span class="kw-2">&</span>str, |
| ) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>str> { |
| vals.binary_search_by_key(<span class="kw-2">&</span>normalized_value, |<span class="kw-2">&</span>(n, <span class="kw">_</span>)| n) |
| .ok() |
| .map(|i| vals[i].<span class="number">1</span>) |
| } |
| |
| <span class="doccomment">/// Return the table of property values for the given property name. |
| /// |
| /// If the property values data is not available, then an error is returned. |
| </span><span class="kw">fn </span>property_values( |
| canonical_property_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><PropertyValues>, Error> { |
| <span class="attribute">#[cfg(not(any( |
| feature = <span class="string">"unicode-age"</span>, |
| feature = <span class="string">"unicode-bool"</span>, |
| feature = <span class="string">"unicode-gencat"</span>, |
| feature = <span class="string">"unicode-perl"</span>, |
| feature = <span class="string">"unicode-script"</span>, |
| feature = <span class="string">"unicode-segment"</span>, |
| )))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><PropertyValues>, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyValueNotFound) |
| } |
| |
| <span class="attribute">#[cfg(any( |
| feature = <span class="string">"unicode-age"</span>, |
| feature = <span class="string">"unicode-bool"</span>, |
| feature = <span class="string">"unicode-gencat"</span>, |
| feature = <span class="string">"unicode-perl"</span>, |
| feature = <span class="string">"unicode-script"</span>, |
| feature = <span class="string">"unicode-segment"</span>, |
| ))] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><PropertyValues>, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::property_values::PROPERTY_VALUES; |
| |
| <span class="prelude-val">Ok</span>(PROPERTY_VALUES |
| .binary_search_by_key(<span class="kw-2">&</span>name, |<span class="kw-2">&</span>(n, <span class="kw">_</span>)| n) |
| .ok() |
| .map(|i| PROPERTY_VALUES[i].<span class="number">1</span>)) |
| } |
| |
| imp(canonical_property_name) |
| } |
| |
| <span class="comment">// This is only used in some cases, but small enough to just let it be dead |
| // instead of figuring out (and maintaining) the right set of features. |
| </span><span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">fn </span>property_set( |
| name_map: <span class="kw-2">&</span><span class="lifetime">'static </span>[(<span class="kw-2">&</span><span class="lifetime">'static </span>str, Range)], |
| canonical: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| ) -> <span class="prelude-ty">Option</span><Range> { |
| name_map |
| .binary_search_by_key(<span class="kw-2">&</span>canonical, |x| x.<span class="number">0</span>) |
| .ok() |
| .map(|i| name_map[i].<span class="number">1</span>) |
| } |
| |
| <span class="doccomment">/// Returns an iterator over Unicode Age sets. Each item corresponds to a set |
| /// of codepoints that were added in a particular revision of Unicode. The |
| /// iterator yields items in chronological order. |
| /// |
| /// If the given age value isn't valid or if the data isn't available, then an |
| /// error is returned instead. |
| </span><span class="kw">fn </span>ages(canonical_age: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="kw">impl </span>Iterator<Item = Range>, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-age"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="kw">impl </span>Iterator<Item = Range>, Error> { |
| <span class="kw">use </span>core::option::IntoIter; |
| <span class="prelude-val">Err</span>::<IntoIter<Range>, <span class="kw">_</span>>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-age"</span>)] |
| </span><span class="kw">fn </span>imp(canonical_age: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="kw">impl </span>Iterator<Item = Range>, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::age; |
| |
| <span class="kw">const </span>AGES: <span class="kw-2">&</span>[(<span class="kw-2">&</span>str, Range)] = <span class="kw-2">&</span>[ |
| (<span class="string">"V1_1"</span>, age::V1_1), |
| (<span class="string">"V2_0"</span>, age::V2_0), |
| (<span class="string">"V2_1"</span>, age::V2_1), |
| (<span class="string">"V3_0"</span>, age::V3_0), |
| (<span class="string">"V3_1"</span>, age::V3_1), |
| (<span class="string">"V3_2"</span>, age::V3_2), |
| (<span class="string">"V4_0"</span>, age::V4_0), |
| (<span class="string">"V4_1"</span>, age::V4_1), |
| (<span class="string">"V5_0"</span>, age::V5_0), |
| (<span class="string">"V5_1"</span>, age::V5_1), |
| (<span class="string">"V5_2"</span>, age::V5_2), |
| (<span class="string">"V6_0"</span>, age::V6_0), |
| (<span class="string">"V6_1"</span>, age::V6_1), |
| (<span class="string">"V6_2"</span>, age::V6_2), |
| (<span class="string">"V6_3"</span>, age::V6_3), |
| (<span class="string">"V7_0"</span>, age::V7_0), |
| (<span class="string">"V8_0"</span>, age::V8_0), |
| (<span class="string">"V9_0"</span>, age::V9_0), |
| (<span class="string">"V10_0"</span>, age::V10_0), |
| (<span class="string">"V11_0"</span>, age::V11_0), |
| (<span class="string">"V12_0"</span>, age::V12_0), |
| (<span class="string">"V12_1"</span>, age::V12_1), |
| (<span class="string">"V13_0"</span>, age::V13_0), |
| (<span class="string">"V14_0"</span>, age::V14_0), |
| (<span class="string">"V15_0"</span>, age::V15_0), |
| ]; |
| <span class="macro">assert_eq!</span>(AGES.len(), age::BY_NAME.len(), <span class="string">"ages are out of sync"</span>); |
| |
| <span class="kw">let </span>pos = AGES.iter().position(|<span class="kw-2">&</span>(age, <span class="kw">_</span>)| canonical_age == age); |
| <span class="kw">match </span>pos { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(Error::PropertyValueNotFound), |
| <span class="prelude-val">Some</span>(i) => <span class="prelude-val">Ok</span>(AGES[..=i].iter().map(|<span class="kw-2">&</span>(<span class="kw">_</span>, classes)| classes)), |
| } |
| } |
| |
| imp(canonical_age) |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given general category. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given general category could not be found, or if the general |
| /// category data is not available, then an error is returned. |
| </span><span class="kw">fn </span>gencat(canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-gencat"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-gencat"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::general_category::BY_NAME; |
| <span class="kw">match </span>name { |
| <span class="string">"ASCII" </span>=> <span class="prelude-val">Ok</span>(hir_class(<span class="kw-2">&</span>[(<span class="string">'\0'</span>, <span class="string">'\x7F'</span>)])), |
| <span class="string">"Any" </span>=> <span class="prelude-val">Ok</span>(hir_class(<span class="kw-2">&</span>[(<span class="string">'\0'</span>, <span class="string">'\u{10FFFF}'</span>)])), |
| <span class="string">"Assigned" </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = gencat(<span class="string">"Unassigned"</span>)<span class="question-mark">?</span>; |
| cls.negate(); |
| <span class="prelude-val">Ok</span>(cls) |
| } |
| name => property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyValueNotFound), |
| } |
| } |
| |
| <span class="kw">match </span>canonical_name { |
| <span class="string">"Decimal_Number" </span>=> perl_digit(), |
| name => imp(name), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given script. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given script could not be found, or if the script data is not |
| /// available, then an error is returned. |
| </span><span class="kw">fn </span>script(canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-script"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-script"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::script::BY_NAME; |
| property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyValueNotFound) |
| } |
| |
| imp(canonical_name) |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given script extension. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given script extension could not be found, or if the script data is |
| /// not available, then an error is returned. |
| </span><span class="kw">fn </span>script_extension( |
| canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| ) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-script"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-script"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::script_extension::BY_NAME; |
| property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyValueNotFound) |
| } |
| |
| imp(canonical_name) |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given Unicode boolean |
| /// property. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given boolean property could not be found, or if the boolean |
| /// property data is not available, then an error is returned. |
| </span><span class="kw">fn </span>bool_property( |
| canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| ) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-bool"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-bool"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::property_bool::BY_NAME; |
| property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyNotFound) |
| } |
| |
| <span class="kw">match </span>canonical_name { |
| <span class="string">"Decimal_Number" </span>=> perl_digit(), |
| <span class="string">"White_Space" </span>=> perl_space(), |
| name => imp(name), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given grapheme cluster |
| /// break property. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given property could not be found, or if the corresponding data is |
| /// not available, then an error is returned. |
| </span><span class="kw">fn </span>gcb(canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-segment"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-segment"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::grapheme_cluster_break::BY_NAME; |
| property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyValueNotFound) |
| } |
| |
| imp(canonical_name) |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given word break |
| /// property. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given property could not be found, or if the corresponding data is |
| /// not available, then an error is returned. |
| </span><span class="kw">fn </span>wb(canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-segment"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-segment"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::word_break::BY_NAME; |
| property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyValueNotFound) |
| } |
| |
| imp(canonical_name) |
| } |
| |
| <span class="doccomment">/// Returns the Unicode HIR class corresponding to the given sentence |
| /// break property. |
| /// |
| /// Name canonicalization is assumed to be performed by the caller. |
| /// |
| /// If the given property could not be found, or if the corresponding data is |
| /// not available, then an error is returned. |
| </span><span class="kw">fn </span>sb(canonical_name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="attribute">#[cfg(not(feature = <span class="string">"unicode-segment"</span>))] |
| </span><span class="kw">fn </span>imp(<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="prelude-val">Err</span>(Error::PropertyNotFound) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-segment"</span>)] |
| </span><span class="kw">fn </span>imp(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str) -> <span class="prelude-ty">Result</span><hir::ClassUnicode, Error> { |
| <span class="kw">use </span><span class="kw">crate</span>::unicode_tables::sentence_break::BY_NAME; |
| property_set(BY_NAME, name) |
| .map(hir_class) |
| .ok_or(Error::PropertyValueNotFound) |
| } |
| |
| imp(canonical_name) |
| } |
| |
| <span class="doccomment">/// Like symbolic_name_normalize_bytes, but operates on a string. |
| </span><span class="kw">fn </span>symbolic_name_normalize(x: <span class="kw-2">&</span>str) -> String { |
| <span class="kw">let </span><span class="kw-2">mut </span>tmp = x.as_bytes().to_vec(); |
| <span class="kw">let </span>len = symbolic_name_normalize_bytes(<span class="kw-2">&mut </span>tmp).len(); |
| tmp.truncate(len); |
| <span class="comment">// This should always succeed because `symbolic_name_normalize_bytes` |
| // guarantees that `&tmp[..len]` is always valid UTF-8. |
| // |
| // N.B. We could avoid the additional UTF-8 check here, but it's unlikely |
| // to be worth skipping the additional safety check. A benchmark must |
| // justify it first. |
| </span>String::from_utf8(tmp).unwrap() |
| } |
| |
| <span class="doccomment">/// Normalize the given symbolic name in place according to UAX44-LM3. |
| /// |
| /// A "symbolic name" typically corresponds to property names and property |
| /// value aliases. Note, though, that it should not be applied to property |
| /// string values. |
| /// |
| /// The slice returned is guaranteed to be valid UTF-8 for all possible values |
| /// of `slice`. |
| /// |
| /// See: https://unicode.org/reports/tr44/#UAX44-LM3 |
| </span><span class="kw">fn </span>symbolic_name_normalize_bytes(slice: <span class="kw-2">&mut </span>[u8]) -> <span class="kw-2">&mut </span>[u8] { |
| <span class="comment">// I couldn't find a place in the standard that specified that property |
| // names/aliases had a particular structure (unlike character names), but |
| // we assume that it's ASCII only and drop anything that isn't ASCII. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>start = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>starts_with_is = <span class="bool-val">false</span>; |
| <span class="kw">if </span>slice.len() >= <span class="number">2 </span>{ |
| <span class="comment">// Ignore any "is" prefix. |
| </span>starts_with_is = slice[<span class="number">0</span>..<span class="number">2</span>] == <span class="string">b"is"</span>[..] |
| || slice[<span class="number">0</span>..<span class="number">2</span>] == <span class="string">b"IS"</span>[..] |
| || slice[<span class="number">0</span>..<span class="number">2</span>] == <span class="string">b"iS"</span>[..] |
| || slice[<span class="number">0</span>..<span class="number">2</span>] == <span class="string">b"Is"</span>[..]; |
| <span class="kw">if </span>starts_with_is { |
| start = <span class="number">2</span>; |
| } |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>next_write = <span class="number">0</span>; |
| <span class="kw">for </span>i <span class="kw">in </span>start..slice.len() { |
| <span class="comment">// VALIDITY ARGUMENT: To guarantee that the resulting slice is valid |
| // UTF-8, we ensure that the slice contains only ASCII bytes. In |
| // particular, we drop every non-ASCII byte from the normalized string. |
| </span><span class="kw">let </span>b = slice[i]; |
| <span class="kw">if </span>b == <span class="string">b' ' </span>|| b == <span class="string">b'_' </span>|| b == <span class="string">b'-' </span>{ |
| <span class="kw">continue</span>; |
| } <span class="kw">else if </span><span class="string">b'A' </span><= b && b <= <span class="string">b'Z' </span>{ |
| slice[next_write] = b + (<span class="string">b'a' </span>- <span class="string">b'A'</span>); |
| next_write += <span class="number">1</span>; |
| } <span class="kw">else if </span>b <= <span class="number">0x7F </span>{ |
| slice[next_write] = b; |
| next_write += <span class="number">1</span>; |
| } |
| } |
| <span class="comment">// Special case: ISO_Comment has a 'isc' abbreviation. Since we generally |
| // ignore 'is' prefixes, the 'isc' abbreviation gets caught in the cross |
| // fire and ends up creating an alias for 'c' to 'ISO_Comment', but it |
| // is actually an alias for the 'Other' general category. |
| </span><span class="kw">if </span>starts_with_is && next_write == <span class="number">1 </span>&& slice[<span class="number">0</span>] == <span class="string">b'c' </span>{ |
| slice[<span class="number">0</span>] = <span class="string">b'i'</span>; |
| slice[<span class="number">1</span>] = <span class="string">b's'</span>; |
| slice[<span class="number">2</span>] = <span class="string">b'c'</span>; |
| next_write = <span class="number">3</span>; |
| } |
| <span class="kw-2">&mut </span>slice[..next_write] |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>simple_fold_ok(c: char) -> <span class="kw">impl </span>Iterator<Item = char> { |
| SimpleCaseFolder::new().unwrap().mapping(c).iter().copied() |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>contains_case_map(start: char, end: char) -> bool { |
| SimpleCaseFolder::new().unwrap().overlaps(start, end) |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>simple_fold_k() { |
| <span class="kw">let </span>xs: Vec<char> = simple_fold_ok(<span class="string">'k'</span>).collect(); |
| <span class="macro">assert_eq!</span>(xs, <span class="macro">alloc::vec!</span>[<span class="string">'K'</span>, <span class="string">'K'</span>]); |
| |
| <span class="kw">let </span>xs: Vec<char> = simple_fold_ok(<span class="string">'K'</span>).collect(); |
| <span class="macro">assert_eq!</span>(xs, <span class="macro">alloc::vec!</span>[<span class="string">'k'</span>, <span class="string">'K'</span>]); |
| |
| <span class="kw">let </span>xs: Vec<char> = simple_fold_ok(<span class="string">'K'</span>).collect(); |
| <span class="macro">assert_eq!</span>(xs, <span class="macro">alloc::vec!</span>[<span class="string">'K'</span>, <span class="string">'k'</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>simple_fold_a() { |
| <span class="kw">let </span>xs: Vec<char> = simple_fold_ok(<span class="string">'a'</span>).collect(); |
| <span class="macro">assert_eq!</span>(xs, <span class="macro">alloc::vec!</span>[<span class="string">'A'</span>]); |
| |
| <span class="kw">let </span>xs: Vec<char> = simple_fold_ok(<span class="string">'A'</span>).collect(); |
| <span class="macro">assert_eq!</span>(xs, <span class="macro">alloc::vec!</span>[<span class="string">'a'</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(not(feature = <span class="string">"unicode-case"</span>))] |
| </span><span class="kw">fn </span>simple_fold_disabled() { |
| <span class="macro">assert!</span>(SimpleCaseFolder::new().is_err()); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>range_contains() { |
| <span class="macro">assert!</span>(contains_case_map(<span class="string">'A'</span>, <span class="string">'A'</span>)); |
| <span class="macro">assert!</span>(contains_case_map(<span class="string">'Z'</span>, <span class="string">'Z'</span>)); |
| <span class="macro">assert!</span>(contains_case_map(<span class="string">'A'</span>, <span class="string">'Z'</span>)); |
| <span class="macro">assert!</span>(contains_case_map(<span class="string">'@'</span>, <span class="string">'A'</span>)); |
| <span class="macro">assert!</span>(contains_case_map(<span class="string">'Z'</span>, <span class="string">'['</span>)); |
| <span class="macro">assert!</span>(contains_case_map(<span class="string">'☃'</span>, <span class="string">'Ⰰ'</span>)); |
| |
| <span class="macro">assert!</span>(!contains_case_map(<span class="string">'['</span>, <span class="string">'['</span>)); |
| <span class="macro">assert!</span>(!contains_case_map(<span class="string">'['</span>, <span class="string">'`'</span>)); |
| |
| <span class="macro">assert!</span>(!contains_case_map(<span class="string">'☃'</span>, <span class="string">'☃'</span>)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"unicode-gencat"</span>)] |
| </span><span class="kw">fn </span>regression_466() { |
| <span class="kw">use super</span>::{CanonicalClassQuery, ClassQuery}; |
| |
| <span class="kw">let </span>q = ClassQuery::OneLetter(<span class="string">'C'</span>); |
| <span class="macro">assert_eq!</span>( |
| q.canonicalize().unwrap(), |
| CanonicalClassQuery::GeneralCategory(<span class="string">"Other"</span>) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>sym_normalize() { |
| <span class="kw">let </span>sym_norm = symbolic_name_normalize; |
| |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"Line_Break"</span>), <span class="string">"linebreak"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"Line-break"</span>), <span class="string">"linebreak"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"linebreak"</span>), <span class="string">"linebreak"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"BA"</span>), <span class="string">"ba"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"ba"</span>), <span class="string">"ba"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"Greek"</span>), <span class="string">"greek"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"isGreek"</span>), <span class="string">"greek"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"IS_Greek"</span>), <span class="string">"greek"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"isc"</span>), <span class="string">"isc"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"is c"</span>), <span class="string">"isc"</span>); |
| <span class="macro">assert_eq!</span>(sym_norm(<span class="string">"is_c"</span>), <span class="string">"isc"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>valid_utf8_symbolic() { |
| <span class="kw">let </span><span class="kw-2">mut </span>x = <span class="string">b"abc\xFFxyz"</span>.to_vec(); |
| <span class="kw">let </span>y = symbolic_name_normalize_bytes(<span class="kw-2">&mut </span>x); |
| <span class="macro">assert_eq!</span>(y, <span class="string">b"abcxyz"</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="regex_syntax" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |