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+ <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
+<span id="2"> 2</span>
+<span id="3"> 3</span>
+<span id="4"> 4</span>
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+<span id="1166">1166</span>
+<span id="1167">1167</span>
+<span id="1168">1168</span>
+<span id="1169">1169</span>
+<span id="1170">1170</span>
+<span id="1171">1171</span>
+<span id="1172">1172</span>
+<span id="1173">1173</span>
+<span id="1174">1174</span>
+<span id="1175">1175</span>
+<span id="1176">1176</span>
+<span id="1177">1177</span>
+<span id="1178">1178</span>
+<span id="1179">1179</span>
+<span id="1180">1180</span>
+<span id="1181">1181</span>
+<span id="1182">1182</span>
+<span id="1183">1183</span>
+<span id="1184">1184</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2014-2015 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 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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'>/*!
+This crate provides a regular expression parser and an abstract syntax for
+regular expressions. The abstract syntax is defined by the `Expr` type. The
+concrete syntax is enumerated in the
+[`regex`](../regex/index.html#syntax)
+crate documentation.
+
+Note that since this crate is first and foremost an implementation detail for
+the `regex` crate, it may experience more frequent breaking changes. It is
+exposed as a separate crate so that others may use it to do analysis on regular
+expressions or even build their own matching engine.
+
+# Example: parsing an expression
+
+Parsing a regular expression can be done with the `Expr::parse` function.
+
+```rust
+use regex_syntax::Expr;
+
+assert_eq!(Expr::parse(r&quot;ab|yz&quot;).unwrap(), Expr::Alternate(vec![
+ Expr::Literal { chars: vec![&#39;a&#39;, &#39;b&#39;], casei: false },
+ Expr::Literal { chars: vec![&#39;y&#39;, &#39;z&#39;], casei: false },
+]));
+```
+
+# Example: inspecting an error
+
+The parser in this crate provides very detailed error values. For example,
+if an invalid character class range is given:
+
+```rust
+use regex_syntax::{Expr, ErrorKind};
+
+let err = Expr::parse(r&quot;[z-a]&quot;).unwrap_err();
+assert_eq!(err.position(), 4);
+assert_eq!(err.kind(), &amp;ErrorKind::InvalidClassRange {
+ start: &#39;z&#39;,
+ end: &#39;a&#39;,
+});
+```
+
+Or unbalanced parentheses:
+
+```rust
+use regex_syntax::{Expr, ErrorKind};
+
+let err = Expr::parse(r&quot;ab(cd&quot;).unwrap_err();
+assert_eq!(err.position(), 2);
+assert_eq!(err.kind(), &amp;ErrorKind::UnclosedParen);
+```
+*/</span>
+
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>deny</span>(<span class='ident'>missing_docs</span>)]</span>
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>quickcheck</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>rand</span>;
+
+<span class='kw'>mod</span> <span class='ident'>parser</span>;
+<span class='kw'>mod</span> <span class='ident'>unicode</span>;
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::{<span class='ident'>Ordering</span>, <span class='ident'>max</span>, <span class='ident'>min</span>};
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>IntoIterator</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>slice</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>vec</span>;
+
+<span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>case_folding</span>;
+
+<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Expr</span>::<span class='op'>*</span>;
+<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Repeater</span>::<span class='op'>*</span>;
+
+<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>;
+
+<span class='doccomment'>/// A regular expression abstract syntax tree.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// An `Expr` represents the abstract syntax of a regular expression.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Expr</span> {
+ <span class='doccomment'>/// An empty regex (which never matches any text).</span>
+ <span class='ident'>Empty</span>,
+ <span class='doccomment'>/// A sequence of one or more literal characters to be matched.</span>
+ <span class='ident'>Literal</span> {
+ <span class='doccomment'>/// The characters.</span>
+ <span class='ident'>chars</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span>,
+ <span class='doccomment'>/// Whether to match case insensitively.</span>
+ <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+ },
+ <span class='doccomment'>/// Match any character, excluding new line.</span>
+ <span class='ident'>AnyChar</span>,
+ <span class='doccomment'>/// Match any character.</span>
+ <span class='ident'>AnyCharNoNL</span>,
+ <span class='doccomment'>/// A character class.</span>
+ <span class='ident'>Class</span>(<span class='ident'>CharClass</span>),
+ <span class='doccomment'>/// Match the start of a line or beginning of input.</span>
+ <span class='ident'>StartLine</span>,
+ <span class='doccomment'>/// Match the end of a line or end of input.</span>
+ <span class='ident'>EndLine</span>,
+ <span class='doccomment'>/// Match the beginning of input.</span>
+ <span class='ident'>StartText</span>,
+ <span class='doccomment'>/// Match the end of input.</span>
+ <span class='ident'>EndText</span>,
+ <span class='doccomment'>/// Match a word boundary (word character on one side and a non-word</span>
+ <span class='doccomment'>/// character on the other).</span>
+ <span class='ident'>WordBoundary</span>,
+ <span class='doccomment'>/// Match a position that is not a word boundary (word or non-word</span>
+ <span class='doccomment'>/// characters on both sides).</span>
+ <span class='ident'>NotWordBoundary</span>,
+ <span class='doccomment'>/// A group, possibly non-capturing.</span>
+ <span class='ident'>Group</span> {
+ <span class='doccomment'>/// The expression inside the group.</span>
+ <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>,
+ <span class='doccomment'>/// The capture index (starting at `1`) only for capturing groups.</span>
+ <span class='ident'>i</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>,
+ <span class='doccomment'>/// The capture name, only for capturing named groups.</span>
+ <span class='ident'>name</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>,
+ },
+ <span class='doccomment'>/// A repeat operator (`?`, `*`, `+` or `{m,n}`).</span>
+ <span class='ident'>Repeat</span> {
+ <span class='doccomment'>/// The expression to be repeated. Limited to literals, `.`, classes</span>
+ <span class='doccomment'>/// or grouped expressions.</span>
+ <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>,
+ <span class='doccomment'>/// The type of repeat operator used.</span>
+ <span class='ident'>r</span>: <span class='ident'>Repeater</span>,
+ <span class='doccomment'>/// Whether the repeat is greedy (match the most) or not (match the</span>
+ <span class='doccomment'>/// least).</span>
+ <span class='ident'>greedy</span>: <span class='ident'>bool</span>,
+ },
+ <span class='doccomment'>/// A concatenation of expressions. Must be matched one after the other.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// N.B. A concat expression can only appear at the top-level or</span>
+ <span class='doccomment'>/// immediately inside a group expression.</span>
+ <span class='ident'>Concat</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>),
+ <span class='doccomment'>/// An alternation of expressions. Only one must match.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// N.B. An alternate expression can only appear at the top-level or</span>
+ <span class='doccomment'>/// immediately inside a group expression.</span>
+ <span class='ident'>Alternate</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>),
+}
+
+<span class='kw'>type</span> <span class='ident'>CaptureIndex</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>;
+
+<span class='kw'>type</span> <span class='ident'>CaptureName</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// The type of a repeat operator expression.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Repeater</span> {
+ <span class='doccomment'>/// Match zero or one (`?`).</span>
+ <span class='ident'>ZeroOrOne</span>,
+ <span class='doccomment'>/// Match zero or more (`*`).</span>
+ <span class='ident'>ZeroOrMore</span>,
+ <span class='doccomment'>/// Match one or more (`+`).</span>
+ <span class='ident'>OneOrMore</span>,
+ <span class='doccomment'>/// Match for at least `min` and at most `max` (`{m,n}`).</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// When `max` is `None`, there is no upper bound on the number of matches.</span>
+ <span class='ident'>Range</span> {
+ <span class='doccomment'>/// Lower bound on the number of matches.</span>
+ <span class='ident'>min</span>: <span class='ident'>u32</span>,
+ <span class='doccomment'>/// Optional upper bound on the number of matches.</span>
+ <span class='ident'>max</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span>,
+ },
+}
+
+<span class='doccomment'>/// A character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// A character class has a canonical format that the parser guarantees. Its</span>
+<span class='doccomment'>/// canonical format is defined by the following invariants:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// 1. Given any Unicode scalar value, it is matched by *at most* one character</span>
+<span class='doccomment'>/// range in a canonical character class.</span>
+<span class='doccomment'>/// 2. Every adjacent character range is separated by at least one Unicode</span>
+<span class='doccomment'>/// scalar value.</span>
+<span class='doccomment'>/// 3. Given any pair of character ranges `r1` and `r2`, if</span>
+<span class='doccomment'>/// `r1.end &lt; r2.start`, then `r1` comes before `r2` in a canonical</span>
+<span class='doccomment'>/// character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// In sum, any `CharClass` produced by this crate&#39;s parser is a sorted</span>
+<span class='doccomment'>/// sequence of non-overlapping ranges. This makes it possible to test whether</span>
+<span class='doccomment'>/// a character is matched by a class with a binary search.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Additionally, a character class may be marked *case insensitive*. If it&#39;s</span>
+<span class='doccomment'>/// case insensitive, then:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// 1. Simple case folding has been applied to all ranges.</span>
+<span class='doccomment'>/// 2. Simple case folding must be applied to a character before testing</span>
+<span class='doccomment'>/// whether it matches the character class.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>CharClass</span> {
+ <span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>,
+ <span class='ident'>casei</span>: <span class='ident'>bool</span>,
+}
+
+<span class='doccomment'>/// A single inclusive range in a character class.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Since range boundaries are defined by Unicode scalar values, the boundaries</span>
+<span class='doccomment'>/// can never be in the open interval `(0xD7FF, 0xE000)`. However, a range may</span>
+<span class='doccomment'>/// *cover* codepoints that are not scalar values.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Note that this has a few convenient impls on `PartialEq` and `PartialOrd`</span>
+<span class='doccomment'>/// for testing whether a character is contained inside a given range.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>PartialOrd</span>, <span class='ident'>Eq</span>, <span class='ident'>Ord</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ClassRange</span> {
+ <span class='doccomment'>/// The start character of the range.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// This must be less than or equal to `end`.</span>
+ <span class='kw'>pub</span> <span class='ident'>start</span>: <span class='ident'>char</span>,
+
+ <span class='doccomment'>/// The end character of the range.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// This must be greater than or equal to `end`.</span>
+ <span class='kw'>pub</span> <span class='ident'>end</span>: <span class='ident'>char</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Expr</span> {
+ <span class='doccomment'>/// Parses a string in a regular expression syntax tree.</span>
+ <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span> {
+ <span class='ident'>parser</span>::<span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='ident'>s</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>())
+ }
+
+ <span class='doccomment'>/// Returns true iff the expression can be repeated by a quantifier.</span>
+ <span class='kw'>fn</span> <span class='ident'>can_repeat</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+ <span class='ident'>Literal</span>{..}
+ <span class='op'>|</span> <span class='ident'>AnyChar</span>
+ <span class='op'>|</span> <span class='ident'>AnyCharNoNL</span>
+ <span class='op'>|</span> <span class='ident'>Class</span>(_)
+ <span class='op'>|</span> <span class='ident'>StartLine</span> <span class='op'>|</span> <span class='ident'>EndLine</span> <span class='op'>|</span> <span class='ident'>StartText</span> <span class='op'>|</span> <span class='ident'>EndText</span>
+ <span class='op'>|</span> <span class='ident'>WordBoundary</span> <span class='op'>|</span> <span class='ident'>NotWordBoundary</span>
+ <span class='op'>|</span> <span class='ident'>Group</span>{..}
+ <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+ _ <span class='op'>=&gt;</span> <span class='boolval'>false</span>,
+ }
+ }
+
+ <span class='kw'>fn</span> <span class='ident'>simplify</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Expr</span> {
+ <span class='kw'>fn</span> <span class='ident'>combine_literals</span>(<span class='ident'>es</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Expr</span><span class='op'>&gt;</span>, <span class='ident'>e</span>: <span class='ident'>Expr</span>) {
+ <span class='kw'>match</span> (<span class='ident'>es</span>.<span class='ident'>pop</span>(), <span class='ident'>e</span>) {
+ (<span class='prelude-val'>None</span>, <span class='ident'>e</span>) <span class='op'>=&gt;</span> <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e</span>),
+ (<span class='prelude-val'>Some</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='kw-2'>mut</span> <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> }),
+ <span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> }) <span class='op'>=&gt;</span> {
+ <span class='kw'>if</span> <span class='ident'>casei1</span> <span class='op'>==</span> <span class='ident'>casei2</span> {
+ <span class='ident'>chars1</span>.<span class='ident'>extend</span>(<span class='ident'>chars2</span>);
+ <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> });
+ } <span class='kw'>else</span> {
+ <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> });
+ <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> });
+ }
+ }
+ (<span class='prelude-val'>Some</span>(<span class='ident'>e1</span>), <span class='ident'>e2</span>) <span class='op'>=&gt;</span> {
+ <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e1</span>);
+ <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e2</span>);
+ }
+ }
+ }
+ <span class='kw'>match</span> <span class='self'>self</span> {
+ <span class='ident'>Repeat</span> { <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=&gt;</span> <span class='ident'>Repeat</span> {
+ <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>.<span class='ident'>simplify</span>()),
+ <span class='ident'>r</span>: <span class='ident'>r</span>,
+ <span class='ident'>greedy</span>: <span class='ident'>greedy</span>,
+ },
+ <span class='ident'>Group</span> { <span class='ident'>e</span>, <span class='ident'>i</span>, <span class='ident'>name</span> } <span class='op'>=&gt;</span> {
+ <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>();
+ <span class='kw'>if</span> <span class='ident'>i</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>name</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>e</span>.<span class='ident'>can_repeat</span>() {
+ <span class='ident'>e</span>
+ } <span class='kw'>else</span> {
+ <span class='ident'>Group</span> { <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>), <span class='ident'>i</span>: <span class='ident'>i</span>, <span class='ident'>name</span>: <span class='ident'>name</span> }
+ }
+ }
+ <span class='ident'>Concat</span>(<span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_es</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>es</span>.<span class='ident'>len</span>());
+ <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> {
+ <span class='ident'>combine_literals</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>new_es</span>, <span class='ident'>e</span>.<span class='ident'>simplify</span>());
+ }
+ <span class='kw'>if</span> <span class='ident'>new_es</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span> {
+ <span class='ident'>new_es</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>()
+ } <span class='kw'>else</span> {
+ <span class='ident'>Concat</span>(<span class='ident'>new_es</span>)
+ }
+ }
+ <span class='ident'>Alternate</span>(<span class='ident'>es</span>) <span class='op'>=&gt;</span> <span class='ident'>Alternate</span>(<span class='ident'>es</span>.<span class='ident'>into_iter</span>()
+ .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>())
+ .<span class='ident'>collect</span>()),
+ <span class='ident'>e</span> <span class='op'>=&gt;</span> <span class='ident'>e</span>,
+ }
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+ <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>ranges</span> }
+}
+
+<span class='kw'>impl</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>ClassRange</span>;
+ <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+ <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>into_iter</span>() }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>ClassRange</span>;
+ <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>ClassRange</span><span class='op'>&gt;</span>;
+ <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>ClassRange</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>iter</span>() }
+}
+
+<span class='kw'>impl</span> <span class='ident'>CharClass</span> {
+ <span class='doccomment'>/// Create a new class from an existing set of ranges.</span>
+ <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>ranges</span>, <span class='ident'>casei</span>: <span class='boolval'>false</span> }
+ }
+
+ <span class='doccomment'>/// Create an empty class.</span>
+ <span class='kw'>fn</span> <span class='ident'>empty</span>() <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>Vec</span>::<span class='ident'>new</span>())
+ }
+
+ <span class='doccomment'>/// Returns true if `c` is matched by this character class.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// If this character class is case insensitive, then simple case folding</span>
+ <span class='doccomment'>/// is applied to `c` before checking for a match.</span>
+ <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>matches</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='kw-2'>mut</span> <span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_case_insensitive</span>() {
+ <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>)
+ }
+ <span class='self'>self</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='ident'>range</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>partial_cmp</span>(<span class='ident'>range</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>()
+ }
+
+ <span class='doccomment'>/// Returns true if this character class should be matched case</span>
+ <span class='doccomment'>/// insensitively.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// When `true`, simple case folding has already been applied to the</span>
+ <span class='doccomment'>/// class.</span>
+ <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_case_insensitive</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='self'>self</span>.<span class='ident'>casei</span>
+ }
+
+ <span class='doccomment'>/// Create a new empty class from this one.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// Namely, its capacity and case insensitive setting will be the same.</span>
+ <span class='kw'>fn</span> <span class='ident'>to_empty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='self'>self</span>.<span class='ident'>len</span>()), <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>casei</span> }
+ }
+
+ <span class='doccomment'>/// Merge two classes and canonicalize them.</span>
+ <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+ <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>CharClass</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>other</span>);
+ <span class='self'>self</span>.<span class='ident'>canonicalize</span>()
+ }
+
+ <span class='doccomment'>/// Canonicalze any sequence of ranges.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// This is responsible for enforcing the canonical format invariants</span>
+ <span class='doccomment'>/// as described on the docs for the `CharClass` type.</span>
+ <span class='kw'>fn</span> <span class='ident'>canonicalize</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='comment'>// TODO: Save some cycles here by checking if already canonicalized.</span>
+ <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>sort</span>();
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ordered</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>(); <span class='comment'>// TODO: Do this in place?</span>
+ <span class='kw'>for</span> <span class='ident'>candidate</span> <span class='kw'>in</span> <span class='self'>self</span> {
+ <span class='comment'>// If the candidate overlaps with an existing range, then it must</span>
+ <span class='comment'>// be the most recent range added because we process the candidates</span>
+ <span class='comment'>// in order.</span>
+ <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>or</span>) <span class='op'>=</span> <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>last_mut</span>() {
+ <span class='kw'>if</span> <span class='ident'>or</span>.<span class='ident'>overlapping</span>(<span class='ident'>candidate</span>) {
+ <span class='op'>*</span><span class='ident'>or</span> <span class='op'>=</span> <span class='ident'>or</span>.<span class='ident'>merge</span>(<span class='ident'>candidate</span>);
+ <span class='kw'>continue</span>;
+ }
+ }
+ <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>candidate</span>);
+ }
+ <span class='ident'>ordered</span>
+ }
+
+ <span class='doccomment'>/// Negates the character class.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// For all `c` where `c` is a Unicode scalar value, `c` matches `self`</span>
+ <span class='doccomment'>/// if and only if `c` does not match `self.negate()`.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// Note that this cannot be called on a character class that has had</span>
+ <span class='doccomment'>/// case folding applied to it. (Because case folding turns on a flag</span>
+ <span class='doccomment'>/// and doesn&#39;t store every possible matching character. Therefore,</span>
+ <span class='doccomment'>/// its negation is tricky to get right. Turns out, we don&#39;t need it</span>
+ <span class='doccomment'>/// anyway!)</span>
+ <span class='kw'>fn</span> <span class='ident'>negate</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>fn</span> <span class='ident'>range</span>(<span class='ident'>s</span>: <span class='ident'>char</span>, <span class='ident'>e</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> { <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>s</span>, <span class='ident'>e</span>) }
+
+ <span class='comment'>// Never allow negating of a class that has been case folded!</span>
+ <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='self'>self</span>.<span class='ident'>casei</span>);
+
+ <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_empty</span>() { <span class='kw'>return</span> <span class='self'>self</span>; }
+ <span class='self'>self</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>canonicalize</span>();
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inv</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>();
+ <span class='kw'>if</span> <span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span> <span class='op'>&gt;</span> <span class='string'>&#39;\x00&#39;</span> {
+ <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='string'>&#39;\x00&#39;</span>, <span class='ident'>dec_char</span>(<span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span>)));
+ }
+ <span class='kw'>for</span> <span class='ident'>win</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>windows</span>(<span class='number'>2</span>) {
+ <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='ident'>win</span>[<span class='number'>0</span>].<span class='ident'>end</span>),
+ <span class='ident'>dec_char</span>(<span class='ident'>win</span>[<span class='number'>1</span>].<span class='ident'>start</span>)));
+ }
+ <span class='kw'>if</span> <span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span> <span class='op'>&lt;</span> <span class='ident'>char</span>::<span class='ident'>MAX</span> {
+ <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span>),
+ <span class='ident'>char</span>::<span class='ident'>MAX</span>));
+ }
+ <span class='ident'>inv</span>
+ }
+
+ <span class='doccomment'>/// Apply case folding to this character class.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// One a class had been case folded, it cannot be negated.</span>
+ <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>folded</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>();
+ <span class='ident'>folded</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+ <span class='kw'>for</span> <span class='ident'>r</span> <span class='kw'>in</span> <span class='self'>self</span> {
+ <span class='comment'>// Applying case folding to a range is expensive because *every*</span>
+ <span class='comment'>// character needed to be examined. Thus, we avoid that drudgery</span>
+ <span class='comment'>// if no character in the current range is in our case folding</span>
+ <span class='comment'>// table.</span>
+ <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>needs_case_folding</span>() {
+ <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>r</span>.<span class='ident'>case_fold</span>());
+ } <span class='kw'>else</span> {
+ <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>r</span>);
+ }
+ }
+ <span class='ident'>folded</span>.<span class='ident'>canonicalize</span>()
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>ClassRange</span> {
+ <span class='doccomment'>/// Create a new class range.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// If `end &lt; start`, then the two values are swapped so that</span>
+ <span class='doccomment'>/// the invariant `start &lt;= end` is preserved.</span>
+ <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>start</span>: <span class='ident'>char</span>, <span class='ident'>end</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+ <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>&lt;=</span> <span class='ident'>end</span> {
+ <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>start</span>, <span class='ident'>end</span>: <span class='ident'>end</span> }
+ } <span class='kw'>else</span> {
+ <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>end</span>, <span class='ident'>end</span>: <span class='ident'>start</span> }
+ }
+ }
+
+ <span class='doccomment'>/// Create a range of one character.</span>
+ <span class='kw'>fn</span> <span class='ident'>one</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+ <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>c</span>, <span class='ident'>end</span>: <span class='ident'>c</span> }
+ }
+
+ <span class='doccomment'>/// Returns true if and only if the two ranges are overlapping. Note that</span>
+ <span class='doccomment'>/// since ranges are inclusive, `a-c` and `d-f` are overlapping!</span>
+ <span class='kw'>fn</span> <span class='ident'>overlapping</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>) <span class='op'>&lt;=</span> <span class='ident'>inc_char</span>(<span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>))
+ }
+
+ <span class='doccomment'>/// Creates a new range representing the union of `self` and `other.</span>
+ <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>ClassRange</span> {
+ <span class='ident'>ClassRange</span> {
+ <span class='ident'>start</span>: <span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>),
+ <span class='ident'>end</span>: <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>),
+ }
+ }
+
+ <span class='doccomment'>/// Returns true if and only if this range contains a character that is</span>
+ <span class='doccomment'>/// in the case folding table.</span>
+ <span class='kw'>fn</span> <span class='ident'>needs_case_folding</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>
+ .<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>c</span>, _)<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>()
+ }
+
+ <span class='doccomment'>/// Apply case folding to this range.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// Since case folding might add characters such that the range is no</span>
+ <span class='doccomment'>/// longer contiguous, this returns multiple class ranges. They are in</span>
+ <span class='doccomment'>/// canonical order.</span>
+ <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> {
+ <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>start</span> <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='self'>self</span>.<span class='ident'>end</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>);
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='self'>self</span>.<span class='ident'>start</span>);
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>start</span>;
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>start</span>;
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='number'>100</span>);
+ <span class='kw'>for</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='kw'>in</span> (<span class='ident'>s</span><span class='op'>+</span><span class='number'>1</span>..<span class='ident'>e</span>).<span class='ident'>filter_map</span>(<span class='ident'>char</span>::<span class='ident'>from_u32</span>) {
+ <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='ident'>next_case_fold</span> {
+ <span class='ident'>c</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>) {
+ <span class='prelude-val'>Ok</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>,
+ <span class='prelude-val'>Err</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> {
+ <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&lt;</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>len</span>() {
+ <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>0</span>;
+ } <span class='kw'>else</span> {
+ <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='string'>&#39;\u{10FFFF}&#39;</span>
+ }
+ <span class='ident'>c</span>
+ }
+ };
+ }
+ <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='ident'>inc_char</span>(<span class='ident'>end</span>) {
+ <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+ <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>c</span>;
+ }
+ <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>c</span>;
+ }
+ <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>));
+ <span class='ident'>ranges</span>
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+ <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='self'>self</span>.<span class='ident'>start</span> <span class='op'>&lt;=</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&amp;&amp;</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&lt;=</span> <span class='self'>self</span>.<span class='ident'>end</span>
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+ <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='ident'>other</span>.<span class='ident'>eq</span>(<span class='self'>self</span>)
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+ <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+ <span class='prelude-val'>Some</span>(<span class='kw'>if</span> <span class='self'>self</span> <span class='op'>==</span> <span class='ident'>other</span> {
+ <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
+ } <span class='kw'>else</span> <span class='kw'>if</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&gt;</span> <span class='self'>self</span>.<span class='ident'>end</span> {
+ <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
+ } <span class='kw'>else</span> {
+ <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
+ })
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>ClassRange</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>char</span> {
+ <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>ClassRange</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+ <span class='ident'>other</span>.<span class='ident'>partial_cmp</span>(<span class='self'>self</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>o</span><span class='op'>|</span> <span class='ident'>o</span>.<span class='ident'>reverse</span>())
+ }
+}
+
+<span class='doccomment'>/// This implementation of `Display` will write a regular expression from the</span>
+<span class='doccomment'>/// syntax tree. It does not write the original string parsed.</span>
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Expr</span> {
+ <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+ <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+ <span class='ident'>Empty</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;&quot;</span>),
+ <span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, <span class='ident'>casei</span> } <span class='op'>=&gt;</span> {
+ <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?i:&quot;</span>)); }
+ <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>chars</span> {
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>quote_char</span>(<span class='ident'>c</span>)));
+ }
+ <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;)&quot;</span>)); }
+ <span class='prelude-val'>Ok</span>(())
+ }
+ <span class='ident'>AnyChar</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?s:.)&quot;</span>),
+ <span class='ident'>AnyCharNoNL</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;.&quot;</span>),
+ <span class='ident'>Class</span>(<span class='kw-2'>ref</span> <span class='ident'>cls</span>) <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>cls</span>),
+ <span class='ident'>StartLine</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?m:^)&quot;</span>),
+ <span class='ident'>EndLine</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?m:$)&quot;</span>),
+ <span class='ident'>StartText</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;^&quot;</span>),
+ <span class='ident'>EndText</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;$&quot;</span>),
+ <span class='ident'>WordBoundary</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;\b&quot;</span>),
+ <span class='ident'>NotWordBoundary</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r&quot;\B&quot;</span>),
+ <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>i</span>: <span class='prelude-val'>None</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span> } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?:{})&quot;</span>, <span class='ident'>e</span>),
+ <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span>, .. } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;({})&quot;</span>, <span class='ident'>e</span>),
+ <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>), .. } <span class='op'>=&gt;</span> {
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?P&lt;{}&gt;{})&quot;</span>, <span class='ident'>n</span>, <span class='ident'>e</span>)
+ }
+ <span class='ident'>Repeat</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=&gt;</span> {
+ <span class='kw'>match</span> <span class='kw-2'>&amp;</span><span class='op'>*</span><span class='op'>*</span><span class='ident'>e</span> {
+ <span class='kw-2'>&amp;</span><span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, .. } <span class='kw'>if</span> <span class='ident'>chars</span>.<span class='ident'>len</span>() <span class='op'>&gt;</span> <span class='number'>1</span> <span class='op'>=&gt;</span> {
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?:{}){}&quot;</span>, <span class='ident'>e</span>, <span class='ident'>r</span>))
+ }
+ _ <span class='op'>=&gt;</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}{}&quot;</span>, <span class='ident'>e</span>, <span class='ident'>r</span>)),
+ }
+ <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>greedy</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;?&quot;</span>)); }
+ <span class='prelude-val'>Ok</span>(())
+ }
+ <span class='ident'>Concat</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+ <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> {
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>e</span>));
+ }
+ <span class='prelude-val'>Ok</span>(())
+ }
+ <span class='ident'>Alternate</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=&gt;</span> {
+ <span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>e</span>) <span class='kw'>in</span> <span class='ident'>es</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
+ <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>&gt;</span> <span class='number'>0</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;|&quot;</span>)); }
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>e</span>));
+ }
+ <span class='prelude-val'>Ok</span>(())
+ }
+ }
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Repeater</span> {
+ <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+ <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+ <span class='ident'>ZeroOrOne</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;?&quot;</span>),
+ <span class='ident'>ZeroOrMore</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;*&quot;</span>),
+ <span class='ident'>OneOrMore</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;+&quot;</span>),
+ <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{},}}&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='kw'>if</span> <span class='ident'>s</span> <span class='op'>==</span> <span class='ident'>e</span> <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{}}}&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{{{}, {}}}&quot;</span>, <span class='ident'>s</span>, <span class='ident'>e</span>),
+ }
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+ <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> {
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;(?i:&quot;</span>));
+ }
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;[&quot;</span>));
+ <span class='kw'>for</span> <span class='ident'>range</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>iter</span>() {
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>range</span>));
+ }
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;]&quot;</span>));
+ <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> {
+ <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;)&quot;</span>));
+ }
+ <span class='prelude-val'>Ok</span>(())
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> {
+ <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}-{}&quot;</span>, <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>start</span>), <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>end</span>))
+ }
+}
+
+<span class='doccomment'>/// An alias for computations that can return a `Error`.</span>
+<span class='kw'>pub</span> <span class='kw'>type</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='op'>=</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>Error</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// A parse error.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This includes details about the specific type of error and a rough</span>
+<span class='doccomment'>/// approximation of where it occurred.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Error</span> {
+ <span class='ident'>pos</span>: <span class='ident'>usize</span>,
+ <span class='ident'>surround</span>: <span class='ident'>String</span>,
+ <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>,
+}
+
+<span class='doccomment'>/// The specific type of parse error that can occur.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>ErrorKind</span> {
+ <span class='doccomment'>/// A negation symbol is used twice in flag settings.</span>
+ <span class='doccomment'>/// e.g., `(?-i-s)`.</span>
+ <span class='ident'>DoubleFlagNegation</span>,
+ <span class='doccomment'>/// The same capture name was used more than once.</span>
+ <span class='doccomment'>/// e.g., `(?P&lt;a&gt;.)(?P&lt;a&gt;.)`.</span>
+ <span class='ident'>DuplicateCaptureName</span>(<span class='ident'>String</span>),
+ <span class='doccomment'>/// An alternate is empty. e.g., `(|a)`.</span>
+ <span class='ident'>EmptyAlternate</span>,
+ <span class='doccomment'>/// A capture group name is empty. e.g., `(?P&lt;&gt;a)`.</span>
+ <span class='ident'>EmptyCaptureName</span>,
+ <span class='doccomment'>/// A negation symbol was not proceded by any flags. e.g., `(?i-)`.</span>
+ <span class='ident'>EmptyFlagNegation</span>,
+ <span class='doccomment'>/// A group is empty. e.g., `()`.</span>
+ <span class='ident'>EmptyGroup</span>,
+ <span class='doccomment'>/// An invalid number was used in a counted repetition. e.g., `a{b}`.</span>
+ <span class='ident'>InvalidBase10</span>(<span class='ident'>String</span>),
+ <span class='doccomment'>/// An invalid hexadecimal number was used in an escape sequence.</span>
+ <span class='doccomment'>/// e.g., `\xAG`.</span>
+ <span class='ident'>InvalidBase16</span>(<span class='ident'>String</span>),
+ <span class='doccomment'>/// An invalid capture name was used. e.g., `(?P&lt;0a&gt;b)`.</span>
+ <span class='ident'>InvalidCaptureName</span>(<span class='ident'>String</span>),
+ <span class='doccomment'>/// An invalid class range was givien. Specifically, when the start of the</span>
+ <span class='doccomment'>/// range is greater than the end. e.g., `[z-a]`.</span>
+ <span class='ident'>InvalidClassRange</span> {
+ <span class='doccomment'>/// The first character specified in the range.</span>
+ <span class='ident'>start</span>: <span class='ident'>char</span>,
+ <span class='doccomment'>/// The second character specified in the range.</span>
+ <span class='ident'>end</span>: <span class='ident'>char</span>,
+ },
+ <span class='doccomment'>/// An escape sequence was used in a character class where it is not</span>
+ <span class='doccomment'>/// allowed. e.g., `[a-\pN]` or `[\A]`.</span>
+ <span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>),
+ <span class='doccomment'>/// An invalid counted repetition min/max was given. e.g., `a{2,1}`.</span>
+ <span class='ident'>InvalidRepeatRange</span> {
+ <span class='doccomment'>/// The first number specified in the repetition.</span>
+ <span class='ident'>min</span>: <span class='ident'>u32</span>,
+ <span class='doccomment'>/// The second number specified in the repetition.</span>
+ <span class='ident'>max</span>: <span class='ident'>u32</span>,
+ },
+ <span class='doccomment'>/// An invalid Unicode scalar value was used in a long hexadecimal</span>
+ <span class='doccomment'>/// sequence. e.g., `\x{D800}`.</span>
+ <span class='ident'>InvalidScalarValue</span>(<span class='ident'>u32</span>),
+ <span class='doccomment'>/// An empty counted repetition operator. e.g., `a{}`.</span>
+ <span class='ident'>MissingBase10</span>,
+ <span class='doccomment'>/// A repetition operator was not applied to an expression. e.g., `*`.</span>
+ <span class='ident'>RepeaterExpectsExpr</span>,
+ <span class='doccomment'>/// A repetition operator was applied to an expression that cannot be</span>
+ <span class='doccomment'>/// repeated. e.g., `a+*` or `a|*`.</span>
+ <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>),
+ <span class='doccomment'>/// A capture group name that is never closed. e.g., `(?P&lt;a`.</span>
+ <span class='ident'>UnclosedCaptureName</span>(<span class='ident'>String</span>),
+ <span class='doccomment'>/// An unclosed hexadecimal literal. e.g., `\x{a`.</span>
+ <span class='ident'>UnclosedHex</span>,
+ <span class='doccomment'>/// An unclosed parenthesis. e.g., `(a`.</span>
+ <span class='ident'>UnclosedParen</span>,
+ <span class='doccomment'>/// An unclosed counted repetition operator. e.g., `a{2`.</span>
+ <span class='ident'>UnclosedRepeat</span>,
+ <span class='doccomment'>/// An unclosed named Unicode class. e.g., `\p{Yi`.</span>
+ <span class='ident'>UnclosedUnicodeName</span>,
+ <span class='doccomment'>/// Saw end of regex before class was closed. e.g., `[a`.</span>
+ <span class='ident'>UnexpectedClassEof</span>,
+ <span class='doccomment'>/// Saw end of regex before escape sequence was closed. e.g., `\`.</span>
+ <span class='ident'>UnexpectedEscapeEof</span>,
+ <span class='doccomment'>/// Saw end of regex before flags were closed. e.g., `(?i`.</span>
+ <span class='ident'>UnexpectedFlagEof</span>,
+ <span class='doccomment'>/// Saw end of regex before two hexadecimal digits were seen. e.g., `\xA`.</span>
+ <span class='ident'>UnexpectedTwoDigitHexEof</span>,
+ <span class='doccomment'>/// Unopened parenthesis. e.g., `)`.</span>
+ <span class='ident'>UnopenedParen</span>,
+ <span class='doccomment'>/// Unrecognized escape sequence. e.g., `\q`.</span>
+ <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>char</span>),
+ <span class='doccomment'>/// Unrecognized flag. e.g., `(?a)`.</span>
+ <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>char</span>),
+ <span class='doccomment'>/// Unrecognized named Unicode class. e.g., `\p{Foo}`.</span>
+ <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='ident'>String</span>),
+ <span class='doccomment'>/// Hints that destructuring should not be exhaustive.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// This enum may grow additional variants, so this makes sure clients</span>
+ <span class='doccomment'>/// don&#39;t count on exhaustive matching. (Otherwise, adding a new variant</span>
+ <span class='doccomment'>/// could break existing code.)</span>
+ <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+ <span class='ident'>__Nonexhaustive</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Error</span> {
+ <span class='doccomment'>/// Returns an approximate *character* offset at which the error occurred.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// The character offset may be equal to the number of characters in the</span>
+ <span class='doccomment'>/// string, in which case it should be interpreted as pointing to the end</span>
+ <span class='doccomment'>/// of the regex.</span>
+ <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>position</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
+ <span class='self'>self</span>.<span class='ident'>pos</span>
+ }
+
+ <span class='doccomment'>/// Returns the type of the regex parse error.</span>
+ <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>kind</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>ErrorKind</span> {
+ <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>kind</span>
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>ErrorKind</span> {
+ <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
+ <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>;
+ <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+ <span class='ident'>DoubleFlagNegation</span> <span class='op'>=&gt;</span> <span class='string'>&quot;double flag negation&quot;</span>,
+ <span class='ident'>DuplicateCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;duplicate capture name&quot;</span>,
+ <span class='ident'>EmptyAlternate</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty alternate&quot;</span>,
+ <span class='ident'>EmptyCaptureName</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty capture name&quot;</span>,
+ <span class='ident'>EmptyFlagNegation</span> <span class='op'>=&gt;</span> <span class='string'>&quot;flag negation without any flags&quot;</span>,
+ <span class='ident'>EmptyGroup</span> <span class='op'>=&gt;</span> <span class='string'>&quot;empty group (e.g., &#39;()&#39;)&quot;</span>,
+ <span class='ident'>InvalidBase10</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid base 10 number&quot;</span>,
+ <span class='ident'>InvalidBase16</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid base 16 number&quot;</span>,
+ <span class='ident'>InvalidCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid capture name&quot;</span>,
+ <span class='ident'>InvalidClassRange</span>{..} <span class='op'>=&gt;</span> <span class='string'>&quot;invalid character class range&quot;</span>,
+ <span class='ident'>InvalidClassEscape</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid escape sequence in class&quot;</span>,
+ <span class='ident'>InvalidRepeatRange</span>{..} <span class='op'>=&gt;</span> <span class='string'>&quot;invalid counted repetition range&quot;</span>,
+ <span class='ident'>InvalidScalarValue</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;invalid Unicode scalar value&quot;</span>,
+ <span class='ident'>MissingBase10</span> <span class='op'>=&gt;</span> <span class='string'>&quot;missing count in repetition operator&quot;</span>,
+ <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=&gt;</span> <span class='string'>&quot;repetition operator missing expression&quot;</span>,
+ <span class='ident'>RepeaterUnexpectedExpr</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;expression cannot be repeated&quot;</span>,
+ <span class='ident'>UnclosedCaptureName</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed capture group name&quot;</span>,
+ <span class='ident'>UnclosedHex</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed hexadecimal literal&quot;</span>,
+ <span class='ident'>UnclosedParen</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed parenthesis&quot;</span>,
+ <span class='ident'>UnclosedRepeat</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed counted repetition operator&quot;</span>,
+ <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unclosed Unicode class literal&quot;</span>,
+ <span class='ident'>UnexpectedClassEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in character class&quot;</span>,
+ <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in escape sequence&quot;</span>,
+ <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in flags&quot;</span>,
+ <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unexpected EOF in hex literal&quot;</span>,
+ <span class='ident'>UnopenedParen</span> <span class='op'>=&gt;</span> <span class='string'>&quot;unopened parenthesis&quot;</span>,
+ <span class='ident'>UnrecognizedEscape</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized escape sequence&quot;</span>,
+ <span class='ident'>UnrecognizedFlag</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized flag&quot;</span>,
+ <span class='ident'>UnrecognizedUnicodeClass</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;unrecognized Unicode class name&quot;</span>,
+ <span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+ }
+ }
+}
+
+<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
+ <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
+ <span class='self'>self</span>.<span class='ident'>kind</span>.<span class='ident'>description</span>()
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
+ <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Error parsing regex near &#39;{}&#39; at character offset {}: {}&quot;</span>,
+ <span class='self'>self</span>.<span class='ident'>surround</span>, <span class='self'>self</span>.<span class='ident'>pos</span>, <span class='self'>self</span>.<span class='ident'>kind</span>)
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ErrorKind</span> {
+ <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+ <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>;
+ <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+ <span class='ident'>DoubleFlagNegation</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Only one negation symbol is allowed in flags.&quot;</span>),
+ <span class='ident'>DuplicateCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture name &#39;{}&#39; is used more than once.&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>EmptyAlternate</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Alternations cannot be empty.&quot;</span>),
+ <span class='ident'>EmptyCaptureName</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture names cannot be empty.&quot;</span>),
+ <span class='ident'>EmptyFlagNegation</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Flag negation requires setting at least one flag.&quot;</span>),
+ <span class='ident'>EmptyGroup</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Empty regex groups (e.g., &#39;()&#39;) are not allowed.&quot;</span>),
+ <span class='ident'>InvalidBase10</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Not a valid base 10 number: &#39;{}&#39;&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>InvalidBase16</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Not a valid base 16 number: &#39;{}&#39;&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>InvalidCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid capture name: &#39;{}&#39;. Capture names must \
+ consist of [_a-zA-Z0-9] and are not allowed to \
+ start with with a number.&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>InvalidClassRange</span> { <span class='ident'>start</span>, <span class='ident'>end</span> } <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid character class range &#39;{}-{}&#39;. \
+ Character class ranges must start with the smaller \
+ character, but {} &gt; {}&quot;</span>, <span class='ident'>start</span>, <span class='ident'>end</span>, <span class='ident'>start</span>, <span class='ident'>end</span>),
+ <span class='ident'>InvalidClassEscape</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid escape sequence in character \
+ class: &#39;{}&#39;.&quot;</span>, <span class='ident'>e</span>),
+ <span class='ident'>InvalidRepeatRange</span> { <span class='ident'>min</span>, <span class='ident'>max</span> } <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid counted repetition range: {{{}, {}}}. \
+ Counted repetition ranges must start with the \
+ minimum, but {} &gt; {}&quot;</span>, <span class='ident'>min</span>, <span class='ident'>max</span>, <span class='ident'>min</span>, <span class='ident'>max</span>),
+ <span class='ident'>InvalidScalarValue</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Number does not correspond to a Unicode scalar \
+ value: &#39;{}&#39;.&quot;</span>, <span class='ident'>c</span>),
+ <span class='ident'>MissingBase10</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Missing maximum in counted reptition operator.&quot;</span>),
+ <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Missing expression for reptition operator.&quot;</span>),
+ <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Invalid application of reptition operator to: \
+ &#39;{}&#39;.&quot;</span>, <span class='ident'>e</span>),
+ <span class='ident'>UnclosedCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Capture name group for &#39;{}&#39; is not closed. \
+ (Missing a &#39;&gt;&#39;.)&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>UnclosedHex</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed hexadecimal literal (missing a &#39;}}&#39;).&quot;</span>),
+ <span class='ident'>UnclosedParen</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed parenthesis.&quot;</span>),
+ <span class='ident'>UnclosedRepeat</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed counted repetition (missing a &#39;}}&#39;).&quot;</span>),
+ <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unclosed Unicode literal (missing a &#39;}}&#39;).&quot;</span>),
+ <span class='ident'>UnexpectedClassEof</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Character class was not closed before the end of \
+ the regex (missing a &#39;]&#39;).&quot;</span>),
+ <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Started an escape sequence that didn&#39;t finish \
+ before the end of the regex.&quot;</span>),
+ <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Inline flag settings was not closed before the end \
+ of the regex (missing a &#39;)&#39; or &#39;:&#39;).&quot;</span>),
+ <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unexpected end of two digit hexadecimal literal.&quot;</span>),
+ <span class='ident'>UnopenedParen</span> <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unopened parenthesis.&quot;</span>),
+ <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized escape sequence: &#39;\\{}&#39;.&quot;</span>, <span class='ident'>c</span>),
+ <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized flag: &#39;{}&#39;. \
+ (Allowed flags: i, s, m, U, x.)&quot;</span>, <span class='ident'>c</span>),
+ <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=&gt;</span>
+ <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Unrecognized Unicode class name: &#39;{}&#39;.&quot;</span>, <span class='ident'>s</span>),
+ <span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
+ }
+ }
+}
+
+<span class='doccomment'>/// Returns the Unicode *simple* case folding of `c`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// N.B. This is hidden because it really isn&#39;t the responsibility of this</span>
+<span class='doccomment'>/// crate to do simple case folding. One hopes that either another crate or</span>
+<span class='doccomment'>/// the standard library will be able to do this for us. In any case, we still</span>
+<span class='doccomment'>/// expose it because it is used inside the various Regex engines.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+ <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>)
+ .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>)
+ .<span class='ident'>unwrap_or</span>(<span class='ident'>c</span>)
+}
+
+<span class='doccomment'>/// The result of binary search on the simple case folding table.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This level of detail is exposed so that we can do case folding on a</span>
+<span class='doccomment'>/// range of characters efficiently.</span>
+<span class='kw'>fn</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>usize</span>, <span class='ident'>usize</span><span class='op'>&gt;</span> {
+ <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>x</span>, _)<span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>))
+}
+
+<span class='doccomment'>/// Escapes all regular expression meta characters in `text`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The string returned may be safely used as a literal in a regular</span>
+<span class='doccomment'>/// expression.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>quote</span>(<span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>quoted</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>text</span>.<span class='ident'>len</span>());
+ <span class='kw'>for</span> <span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>text</span>.<span class='ident'>chars</span>() {
+ <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+ <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>);
+ }
+ <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
+ }
+ <span class='ident'>quoted</span>
+}
+
+<span class='kw'>fn</span> <span class='ident'>quote_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>new</span>();
+ <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
+ <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>);
+ }
+ <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
+ <span class='ident'>s</span>
+}
+
+<span class='kw'>fn</span> <span class='ident'>inc_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+ <span class='kw'>match</span> <span class='ident'>c</span> {
+ <span class='ident'>char</span>::<span class='ident'>MAX</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>MAX</span>,
+ <span class='string'>&#39;\u{D7FF}&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\u{E000}&#39;</span>,
+ <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(),
+ }
+}
+
+<span class='kw'>fn</span> <span class='ident'>dec_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>char</span> {
+ <span class='kw'>match</span> <span class='ident'>c</span> {
+ <span class='string'>&#39;\x00&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\x00&#39;</span>,
+ <span class='string'>&#39;\u{E000}&#39;</span> <span class='op'>=&gt;</span> <span class='string'>&#39;\u{D7FF}&#39;</span>,
+ <span class='ident'>c</span> <span class='op'>=&gt;</span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>-</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(),
+ }
+}
+
+<span class='doccomment'>/// Returns true if and only if `c` is a word character.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_word_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+ <span class='kw'>match</span> <span class='ident'>c</span> {
+ <span class='string'>&#39;_&#39;</span> <span class='op'>|</span> <span class='string'>&#39;0&#39;</span> ... <span class='string'>&#39;9&#39;</span> <span class='op'>|</span> <span class='string'>&#39;a&#39;</span> ... <span class='string'>&#39;z&#39;</span> <span class='op'>|</span> <span class='string'>&#39;A&#39;</span> ... <span class='string'>&#39;Z&#39;</span> <span class='op'>=&gt;</span> <span class='boolval'>true</span>,
+ _ <span class='op'>=&gt;</span> ::<span class='ident'>unicode</span>::<span class='ident'>regex</span>::<span class='ident'>PERLW</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span>(<span class='ident'>start</span>, <span class='ident'>end</span>)<span class='op'>|</span> {
+ <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>&gt;=</span> <span class='ident'>start</span> <span class='op'>&amp;&amp;</span> <span class='ident'>c</span> <span class='op'>&lt;=</span> <span class='ident'>end</span> {
+ <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
+ } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>&gt;</span> <span class='ident'>c</span> {
+ <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
+ } <span class='kw'>else</span> {
+ <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
+ }
+ }).<span class='ident'>is_ok</span>(),
+ }
+}
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>properties</span>;
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>tests</span> {
+ <span class='kw'>use</span> {<span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>};
+
+ <span class='kw'>fn</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>let</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>ranges</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>()
+ .<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)).<span class='ident'>collect</span>();
+ <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>ranges</span>)
+ }
+
+ <span class='kw'>fn</span> <span class='ident'>classi</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&amp;</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-&gt;</span> <span class='ident'>CharClass</span> {
+ <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>);
+ <span class='ident'>cls</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>;
+ <span class='ident'>cls</span>
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_no_change</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>cls</span>);
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_unordered</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_overlap</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;w&#39;</span>, <span class='string'>&#39;y&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;w&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;c&#39;</span>, <span class='string'>&#39;f&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;g&#39;</span>), (<span class='string'>&#39;d&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>),
+ (<span class='string'>&#39;m&#39;</span>, <span class='string'>&#39;p&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+ ]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many_case_fold</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;C&#39;</span>, <span class='string'>&#39;F&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;G&#39;</span>), (<span class='string'>&#39;D&#39;</span>, <span class='string'>&#39;J&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;C&#39;</span>),
+ (<span class='string'>&#39;M&#39;</span>, <span class='string'>&#39;P&#39;</span>), (<span class='string'>&#39;L&#39;</span>, <span class='string'>&#39;S&#39;</span>), (<span class='string'>&#39;c&#39;</span>, <span class='string'>&#39;f&#39;</span>),
+ ]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;j&#39;</span>), (<span class='string'>&#39;l&#39;</span>, <span class='string'>&#39;s&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_boundary</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>), (<span class='string'>&#39;u&#39;</span>, <span class='string'>&#39;w&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;u&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_extreme_edge_case</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>), (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_canon_singles</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>), (<span class='string'>&#39;b&#39;</span>, <span class='string'>&#39;b&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;b&#39;</span>)]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_single</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_singles</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>), (<span class='string'>&#39;b&#39;</span>, <span class='string'>&#39;b&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x63&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_multiples</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;c&#39;</span>), (<span class='string'>&#39;x&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>), (<span class='string'>&#39;\x64&#39;</span>, <span class='string'>&#39;\x77&#39;</span>), (<span class='string'>&#39;\x7b&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_min_scalar</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;a&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x62&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_max_scalar</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x60&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_everything</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_everything_sans_one</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{10FFFD}&#39;</span>), (<span class='string'>&#39;\u{10FFFF}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)
+ ]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\u{10FFFE}&#39;</span>, <span class='string'>&#39;\u{10FFFE}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FF}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\u{E000}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min_edge</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FE}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\u{D7FF}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\u{E000}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{D7FF}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max_edge</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\u{E001}&#39;</span>, <span class='string'>&#39;\u{10FFFF}&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\u{E000}&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_fold_retain_only_needed</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_fold_az</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;Z&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;z&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_fold_a_underscore</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>),
+ ]));
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;_&#39;</span>, <span class='string'>&#39;_&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_fold_a_equals</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>), (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>), (<span class='string'>&#39;A&#39;</span>, <span class='string'>&#39;A&#39;</span>),
+ ]));
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;=&#39;</span>, <span class='string'>&#39;=&#39;</span>), (<span class='string'>&#39;a&#39;</span>, <span class='string'>&#39;a&#39;</span>),
+ ]));
+ }
+
+ <span class='attribute'>#[<span class='ident'>test</span>]</span>
+ <span class='kw'>fn</span> <span class='ident'>class_fold_no_folding_needed</span>() {
+ <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&amp;</span>[(<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x10&#39;</span>)]);
+ <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&amp;</span>[
+ (<span class='string'>&#39;\x00&#39;</span>, <span class='string'>&#39;\x10&#39;</span>),
+ ]));
+ }
+}
+</pre>
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