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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
| <span id="2"> 2</span> |
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| <span id="1000">1000</span> |
| <span id="1001">1001</span> |
| <span id="1002">1002</span> |
| <span id="1003">1003</span> |
| <span id="1004">1004</span> |
| <span id="1005">1005</span> |
| <span id="1006">1006</span> |
| <span id="1007">1007</span> |
| <span id="1008">1008</span> |
| <span id="1009">1009</span> |
| <span id="1010">1010</span> |
| <span id="1011">1011</span> |
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| <span id="1016">1016</span> |
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| <span id="1019">1019</span> |
| <span id="1020">1020</span> |
| <span id="1021">1021</span> |
| <span id="1022">1022</span> |
| <span id="1023">1023</span> |
| <span id="1024">1024</span> |
| <span id="1025">1025</span> |
| <span id="1026">1026</span> |
| <span id="1027">1027</span> |
| <span id="1028">1028</span> |
| <span id="1029">1029</span> |
| <span id="1030">1030</span> |
| <span id="1031">1031</span> |
| <span id="1032">1032</span> |
| <span id="1033">1033</span> |
| <span id="1034">1034</span> |
| <span id="1035">1035</span> |
| <span id="1036">1036</span> |
| <span id="1037">1037</span> |
| <span id="1038">1038</span> |
| <span id="1039">1039</span> |
| <span id="1040">1040</span> |
| <span id="1041">1041</span> |
| <span id="1042">1042</span> |
| <span id="1043">1043</span> |
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| <span id="1045">1045</span> |
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| <span id="1048">1048</span> |
| <span id="1049">1049</span> |
| <span id="1050">1050</span> |
| <span id="1051">1051</span> |
| <span id="1052">1052</span> |
| <span id="1053">1053</span> |
| <span id="1054">1054</span> |
| <span id="1055">1055</span> |
| <span id="1056">1056</span> |
| <span id="1057">1057</span> |
| <span id="1058">1058</span> |
| <span id="1059">1059</span> |
| <span id="1060">1060</span> |
| <span id="1061">1061</span> |
| <span id="1062">1062</span> |
| <span id="1063">1063</span> |
| <span id="1064">1064</span> |
| <span id="1065">1065</span> |
| <span id="1066">1066</span> |
| <span id="1067">1067</span> |
| <span id="1068">1068</span> |
| <span id="1069">1069</span> |
| <span id="1070">1070</span> |
| <span id="1071">1071</span> |
| <span id="1072">1072</span> |
| <span id="1073">1073</span> |
| <span id="1074">1074</span> |
| <span id="1075">1075</span> |
| <span id="1076">1076</span> |
| <span id="1077">1077</span> |
| <span id="1078">1078</span> |
| <span id="1079">1079</span> |
| <span id="1080">1080</span> |
| <span id="1081">1081</span> |
| <span id="1082">1082</span> |
| <span id="1083">1083</span> |
| <span id="1084">1084</span> |
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| <span id="2041">2041</span> |
| <span id="2042">2042</span> |
| <span id="2043">2043</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 <LICENSE-APACHE or</span> |
| <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| |
| <span class="doccomment">/*! |
| 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"ab|yz").unwrap(), Expr::Alternate(vec![ |
| Expr::Literal { chars: vec!['a', 'b'], casei: false }, |
| Expr::Literal { chars: vec!['y', 'z'], 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"[z-a]").unwrap_err(); |
| assert_eq!(err.position(), 4); |
| assert_eq!(err.kind(), &ErrorKind::InvalidClassRange { |
| start: 'z', |
| end: 'a', |
| }); |
| ``` |
| |
| Or unbalanced parentheses: |
| |
| ```rust |
| use regex_syntax::{Expr, ErrorKind}; |
| |
| let err = Expr::parse(r"ab(cd").unwrap_err(); |
| assert_eq!(err.position(), 2); |
| assert_eq!(err.kind(), &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="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">deny</span>(<span class="ident">warnings</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">literals</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">ascii</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">result</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">u8</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="kw-2">*</span>; |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">Repeater</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use</span> <span class="ident">parser</span>::{<span class="ident">Flags</span>, <span class="ident">Parser</span>}; |
| |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">literals</span>::{<span class="ident">Literals</span>, <span class="ident">Lit</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"><</span><span class="ident">char</span><span class="op">></span>, |
| <span class="doccomment">/// Whether to match case insensitively.</span> |
| <span class="ident">casei</span>: <span class="ident">bool</span>, |
| }, |
| <span class="doccomment">/// A sequence of one or more literal bytes to be matched.</span> |
| <span class="ident">LiteralBytes</span> { |
| <span class="doccomment">/// The bytes.</span> |
| <span class="ident">bytes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, |
| <span class="doccomment">/// Whether to match case insensitively.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The interpretation of "case insensitive" in this context is</span> |
| <span class="doccomment">/// ambiguous since `bytes` can be arbitrary. However, a good heuristic</span> |
| <span class="doccomment">/// is to assume that the bytes are ASCII-compatible and do simple</span> |
| <span class="doccomment">/// ASCII case folding.</span> |
| <span class="ident">casei</span>: <span class="ident">bool</span>, |
| }, |
| <span class="doccomment">/// Match any character.</span> |
| <span class="ident">AnyChar</span>, |
| <span class="doccomment">/// Match any character, excluding new line (`0xA`).</span> |
| <span class="ident">AnyCharNoNL</span>, |
| <span class="doccomment">/// Match any byte.</span> |
| <span class="ident">AnyByte</span>, |
| <span class="doccomment">/// Match any byte, excluding new line (`0xA`).</span> |
| <span class="ident">AnyByteNoNL</span>, |
| <span class="doccomment">/// A character class.</span> |
| <span class="ident">Class</span>(<span class="ident">CharClass</span>), |
| <span class="doccomment">/// A character class with byte ranges only.</span> |
| <span class="ident">ClassBytes</span>(<span class="ident">ByteClass</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">/// Match an ASCII word boundary.</span> |
| <span class="ident">WordBoundaryAscii</span>, |
| <span class="doccomment">/// Match a position that is not an ASCII word boundary.</span> |
| <span class="ident">NotWordBoundaryAscii</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"><</span><span class="ident">Expr</span><span class="op">></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"><</span><span class="ident">usize</span><span class="op">></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"><</span><span class="ident">String</span><span class="op">></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"><</span><span class="ident">Expr</span><span class="op">></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"><</span><span class="ident">Expr</span><span class="op">></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"><</span><span class="ident">Expr</span><span class="op">></span>), |
| } |
| |
| <span class="kw">type</span> <span class="ident">CaptureIndex</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>; |
| |
| <span class="kw">type</span> <span class="ident">CaptureName</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></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"><</span><span class="ident">u32</span><span class="op">></span>, |
| }, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Repeater</span> { |
| <span class="doccomment">/// Returns true if and only if this repetition can match the empty string.</span> |
| <span class="kw">fn</span> <span class="ident">matches_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">Repeater</span>::<span class="kw-2">*</span>; |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">ZeroOrOne</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| <span class="ident">ZeroOrMore</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| <span class="ident">OneOrMore</span> <span class="op">=></span> <span class="bool-val">false</span>, |
| <span class="ident">Range</span> { <span class="ident">min</span>, .. } <span class="op">=></span> <span class="ident">min</span> <span class="op">==</span> <span class="number">0</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 < 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'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">/// If the case insensitive flag was set when parsing a character class, then</span> |
| <span class="doccomment">/// simple case folding is done automatically. For example, `(?i)[a-c]` is</span> |
| <span class="doccomment">/// automatically translated to `[a-cA-C]`.</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"><</span><span class="ident">ClassRange</span><span class="op">></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 `start`.</span> |
| <span class="kw">pub</span> <span class="ident">end</span>: <span class="ident">char</span>, |
| } |
| |
| <span class="doccomment">/// A byte class for byte ranges only.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// A byte 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 byte, it is matched by *at most* one byte range in a canonical</span> |
| <span class="doccomment">/// character class.</span> |
| <span class="doccomment">/// 2. Every adjacent byte range is separated by at least one byte.</span> |
| <span class="doccomment">/// 3. Given any pair of byte ranges `r1` and `r2`, if</span> |
| <span class="doccomment">/// `r1.end < 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 `ByteClass` produced by this crate'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 byte is matched by a class with a binary search.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the case insensitive flag was set when parsing a character class,</span> |
| <span class="doccomment">/// then simple ASCII-only case folding is done automatically. For example,</span> |
| <span class="doccomment">/// `(?i)[a-c]` is automatically translated to `[a-cA-C]`.</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">ByteClass</span> { |
| <span class="ident">ranges</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span>, |
| } |
| |
| <span class="doccomment">/// A single inclusive range in a byte class.</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 byte 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">ByteRange</span> { |
| <span class="doccomment">/// The start byte 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">u8</span>, |
| |
| <span class="doccomment">/// The end byte 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">u8</span>, |
| } |
| |
| <span class="doccomment">/// A builder for configuring regular expression parsing.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This allows setting the default values of flags and other options, such</span> |
| <span class="doccomment">/// as the maximum nesting depth.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ExprBuilder</span> { |
| <span class="ident">flags</span>: <span class="ident">Flags</span>, |
| <span class="ident">nest_limit</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">ExprBuilder</span> { |
| <span class="doccomment">/// Create a new builder for configuring expression parsing.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that all flags are disabled by default.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="ident">ExprBuilder</span> { |
| <span class="ident">flags</span>: <span class="ident">Flags</span>::<span class="ident">default</span>(), |
| <span class="ident">nest_limit</span>: <span class="number">200</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Set the default value for the case insensitive (`i`) flag.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">case_insensitive</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">casei</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Set the default value for the multi-line matching (`m`) flag.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">multi_line</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">multi</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Set the default value for the any character (`s`) flag.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dot_matches_new_line</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">dotnl</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Set the default value for the greedy swap (`U`) flag.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap_greed</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">swap_greed</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Set the default value for the ignore whitespace (`x`) flag.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ignore_whitespace</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">ignore_space</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Set the default value for the Unicode (`u`) flag.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If `yes` is false, then `allow_bytes` is set to true.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unicode</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">yes</span> { |
| <span class="self">self</span>.<span class="ident">allow_bytes</span>(<span class="bool-val">true</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span> |
| } |
| } |
| |
| <span class="doccomment">/// Whether the parser allows matching arbitrary bytes or not.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When the `u` flag is disabled (either with this builder or in the</span> |
| <span class="doccomment">/// expression itself), the parser switches to interpreting the expression</span> |
| <span class="doccomment">/// as matching arbitrary bytes instead of Unicode codepoints. For example,</span> |
| <span class="doccomment">/// the expression `(?u:\xFF)` matches the *codepoint* `\xFF`, which</span> |
| <span class="doccomment">/// corresponds to the UTF-8 byte sequence `\xCE\xBF`. Conversely,</span> |
| <span class="doccomment">/// `(?-u:\xFF)` matches the *byte* `\xFF`, which is not valid UTF-8.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When `allow_bytes` is disabled (the default), an expression like</span> |
| <span class="doccomment">/// `(?-u:\xFF)` will cause the parser to return an error, since it would</span> |
| <span class="doccomment">/// otherwise match invalid UTF-8. When enabled, it will be allowed.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">allow_bytes</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">yes</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">allow_bytes</span> <span class="op">=</span> <span class="ident">yes</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Set the nesting limit for regular expression parsing.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Regular expressions that nest more than this limit will result in a</span> |
| <span class="doccomment">/// `StackExhausted` error.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nest_limit</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">limit</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ExprBuilder</span> { |
| <span class="self">self</span>.<span class="ident">nest_limit</span> <span class="op">=</span> <span class="ident">limit</span>; |
| <span class="self">self</span> |
| } |
| |
| <span class="doccomment">/// Parse a string as a regular expression using the current configuraiton.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span>(<span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Expr</span><span class="op">></span> { |
| <span class="ident">Parser</span>::<span class="ident">parse</span>(<span class="ident">s</span>, <span class="self">self</span>.<span class="ident">flags</span>).<span class="ident">and_then</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="self">self</span>.<span class="ident">nest_limit</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="doccomment">///</span> |
| <span class="doccomment">/// This is a convenience method for parsing an expression using the</span> |
| <span class="doccomment">/// default configuration. To tweak parsing options (such as which flags</span> |
| <span class="doccomment">/// are enabled by default), use the `ExprBuilder` type.</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">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Expr</span><span class="op">></span> { |
| <span class="ident">ExprBuilder</span>::<span class="ident">new</span>().<span class="ident">parse</span>(<span class="ident">s</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">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Literal</span>{..} <span class="op">|</span> <span class="ident">LiteralBytes</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">AnyByte</span> <span class="op">|</span> <span class="ident">AnyByteNoNL</span> |
| <span class="op">|</span> <span class="ident">Class</span>(_) <span class="op">|</span> <span class="ident">ClassBytes</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">WordBoundaryAscii</span> <span class="op">|</span> <span class="ident">NotWordBoundaryAscii</span> |
| <span class="op">|</span> <span class="ident">Group</span>{..} |
| <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">simplify</span>(<span class="self">self</span>, <span class="ident">nest_limit</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Expr</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">combine_literals</span>(<span class="ident">es</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Expr</span><span class="op">></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">=></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">=></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">LiteralBytes</span> { <span class="ident">bytes</span>: <span class="kw-2">mut</span> <span class="ident">bytes1</span>, <span class="ident">casei</span>: <span class="ident">casei1</span> }), |
| <span class="ident">LiteralBytes</span> { <span class="ident">bytes</span>: <span class="ident">bytes2</span>, <span class="ident">casei</span>: <span class="ident">casei2</span> }) <span class="op">=></span> { |
| <span class="kw">if</span> <span class="ident">casei1</span> <span class="op">==</span> <span class="ident">casei2</span> { |
| <span class="ident">bytes1</span>.<span class="ident">extend</span>(<span class="ident">bytes2</span>); |
| <span class="ident">es</span>.<span class="ident">push</span>(<span class="ident">LiteralBytes</span> { <span class="ident">bytes</span>: <span class="ident">bytes1</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">LiteralBytes</span> { <span class="ident">bytes</span>: <span class="ident">bytes1</span>, <span class="ident">casei</span>: <span class="ident">casei1</span> }); |
| <span class="ident">es</span>.<span class="ident">push</span>(<span class="ident">LiteralBytes</span> { <span class="ident">bytes</span>: <span class="ident">bytes2</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">=></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">fn</span> <span class="ident">simp</span>(<span class="ident">expr</span>: <span class="ident">Expr</span>, <span class="ident">recurse</span>: <span class="ident">usize</span>, <span class="ident">limit</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Expr</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="ident">recurse</span> <span class="op">></span> <span class="ident">limit</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error</span> { |
| <span class="ident">pos</span>: <span class="number">0</span>, |
| <span class="ident">surround</span>: <span class="string">""</span>.<span class="ident">to_owned</span>(), |
| <span class="ident">kind</span>: <span class="ident">ErrorKind</span>::<span class="ident">StackExhausted</span>, |
| }); |
| } |
| <span class="kw">let</span> <span class="ident">simplify</span> <span class="op">=</span> <span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">simp</span>(<span class="ident">e</span>, <span class="ident">recurse</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">limit</span>); |
| <span class="prelude-val">Ok</span>(<span class="kw">match</span> <span class="ident">expr</span> { |
| <span class="ident">Repeat</span> { <span class="ident">e</span>, <span class="ident">r</span>, <span class="ident">greedy</span> } <span class="op">=></span> <span class="ident">Repeat</span> { |
| <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">simplify</span>(<span class="kw-2">*</span><span class="ident">e</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">=></span> { |
| <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">simplify</span>(<span class="kw-2">*</span><span class="ident">e</span>)); |
| <span class="kw">if</span> <span class="ident">i</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="ident">name</span>.<span class="ident">is_none</span>() <span class="op">&&</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">=></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">&</span><span class="kw-2">mut</span> <span class="ident">new_es</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">simplify</span>(<span class="ident">e</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">=></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">new_es</span>.<span class="ident">push</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">simplify</span>(<span class="ident">e</span>))); |
| } |
| <span class="ident">Alternate</span>(<span class="ident">new_es</span>) |
| } |
| <span class="ident">e</span> <span class="op">=></span> <span class="ident">e</span>, |
| }) |
| } |
| <span class="ident">simp</span>(<span class="self">self</span>, <span class="number">0</span>, <span class="ident">nest_limit</span>) |
| } |
| |
| <span class="doccomment">/// Returns a set of literal prefixes extracted from this expression.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">prefixes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Literals</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">Literals</span>::<span class="ident">empty</span>(); |
| <span class="ident">lits</span>.<span class="ident">union_prefixes</span>(<span class="self">self</span>); |
| <span class="ident">lits</span> |
| } |
| |
| <span class="doccomment">/// Returns a set of literal suffixes extracted from this expression.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">suffixes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Literals</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">Literals</span>::<span class="ident">empty</span>(); |
| <span class="ident">lits</span>.<span class="ident">union_suffixes</span>(<span class="self">self</span>); |
| <span class="ident">lits</span> |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the expression is required to match from</span> |
| <span class="doccomment">/// the beginning of text.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_anchored_start</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>, .. } <span class="op">=></span> { |
| <span class="op">!</span><span class="ident">r</span>.<span class="ident">matches_empty</span>() <span class="op">&&</span> <span class="ident">e</span>.<span class="ident">is_anchored_start</span>() |
| } |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=></span> <span class="ident">e</span>.<span class="ident">is_anchored_start</span>(), |
| <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>[<span class="number">0</span>].<span class="ident">is_anchored_start</span>(), |
| <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">is_anchored_start</span>()), |
| <span class="ident">StartText</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the expression has at least one matchable</span> |
| <span class="doccomment">/// sub-expression that must match the beginning of text.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_anchored_start</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>, .. } <span class="op">=></span> { |
| <span class="op">!</span><span class="ident">r</span>.<span class="ident">matches_empty</span>() <span class="op">&&</span> <span class="ident">e</span>.<span class="ident">has_anchored_start</span>() |
| } |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=></span> <span class="ident">e</span>.<span class="ident">has_anchored_start</span>(), |
| <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>[<span class="number">0</span>].<span class="ident">has_anchored_start</span>(), |
| <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">has_anchored_start</span>()), |
| <span class="ident">StartText</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the expression is required to match at the</span> |
| <span class="doccomment">/// end of the text.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_anchored_end</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>, .. } <span class="op">=></span> { |
| <span class="op">!</span><span class="ident">r</span>.<span class="ident">matches_empty</span>() <span class="op">&&</span> <span class="ident">e</span>.<span class="ident">is_anchored_end</span>() |
| } |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=></span> <span class="ident">e</span>.<span class="ident">is_anchored_end</span>(), |
| <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>[<span class="ident">es</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>].<span class="ident">is_anchored_end</span>(), |
| <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">is_anchored_end</span>()), |
| <span class="ident">EndText</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the expression has at least one matchable</span> |
| <span class="doccomment">/// sub-expression that must match the beginning of text.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_anchored_end</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>, .. } <span class="op">=></span> { |
| <span class="op">!</span><span class="ident">r</span>.<span class="ident">matches_empty</span>() <span class="op">&&</span> <span class="ident">e</span>.<span class="ident">has_anchored_end</span>() |
| } |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=></span> <span class="ident">e</span>.<span class="ident">has_anchored_end</span>(), |
| <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>[<span class="ident">es</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>].<span class="ident">has_anchored_end</span>(), |
| <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">has_anchored_end</span>()), |
| <span class="ident">EndText</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the expression contains sub-expressions</span> |
| <span class="doccomment">/// that can match arbitrary bytes.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=></span> <span class="ident">e</span>.<span class="ident">has_bytes</span>(), |
| <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=></span> <span class="ident">e</span>.<span class="ident">has_bytes</span>(), |
| <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">has_bytes</span>()), |
| <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=></span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">has_bytes</span>()), |
| <span class="ident">LiteralBytes</span>{..} <span class="op">=></span> <span class="bool-val">true</span>, |
| <span class="ident">AnyByte</span> <span class="op">|</span> <span class="ident">AnyByteNoNL</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| <span class="ident">ClassBytes</span>(_) <span class="op">=></span> <span class="bool-val">true</span>, |
| <span class="ident">WordBoundaryAscii</span> <span class="op">|</span> <span class="ident">NotWordBoundaryAscii</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</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"><</span><span class="ident">ClassRange</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">ClassRange</span><span class="op">></span> { <span class="kw-2">&</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"><</span><span class="ident">ClassRange</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">vec</span>::<span class="ident">IntoIter</span><span class="op"><</span><span class="ident">ClassRange</span><span class="op">></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"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'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">&</span><span class="lifetime">'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"><</span><span class="lifetime">'a</span>, <span class="ident">ClassRange</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">ClassRange</span><span class="op">></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">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">ranges</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">ClassRange</span><span class="op">></span>) <span class="op">-></span> <span class="ident">CharClass</span> { |
| <span class="ident">CharClass</span> { <span class="ident">ranges</span>: <span class="ident">ranges</span> } |
| } |
| |
| <span class="doccomment">/// Create an empty class.</span> |
| <span class="kw">fn</span> <span class="ident">empty</span>() <span class="op">-></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="kw">pub</span> <span class="kw">fn</span> <span class="ident">matches</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="ident">bool</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">/// Removes the given character from the class if it exists.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that this takes `O(n)` time in the number of ranges.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">partial_cmp</span>(<span class="ident">r</span>).<span class="ident">unwrap</span>()) { |
| <span class="prelude-val">Ok</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="ident">i</span>, |
| <span class="prelude-val">Err</span>(_) <span class="op">=></span> <span class="kw">return</span>, |
| }; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">remove</span>(<span class="ident">i</span>); |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">start</span> <span class="op">==</span> <span class="ident">c</span> { |
| <span class="ident">r</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">inc_char</span>(<span class="ident">c</span>); |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">start</span> <span class="op">></span> <span class="ident">r</span>.<span class="ident">end</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="ident">char</span>::<span class="ident">MAX</span> { |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="ident">i</span>, <span class="ident">r</span>); |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">end</span> <span class="op">==</span> <span class="ident">c</span> { |
| <span class="ident">r</span>.<span class="ident">end</span> <span class="op">=</span> <span class="ident">dec_char</span>(<span class="ident">c</span>); |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">end</span> <span class="op"><</span> <span class="ident">r</span>.<span class="ident">start</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'\x00'</span> { |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="ident">r</span>); |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">r1</span>, <span class="kw-2">mut</span> <span class="ident">r2</span>) <span class="op">=</span> (<span class="ident">r</span>.<span class="ident">clone</span>(), <span class="ident">r</span>.<span class="ident">clone</span>()); |
| <span class="ident">r1</span>.<span class="ident">end</span> <span class="op">=</span> <span class="ident">dec_char</span>(<span class="ident">c</span>); |
| <span class="kw">if</span> <span class="ident">r1</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="ident">r1</span>.<span class="ident">end</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="ident">i</span>, <span class="ident">r1</span>); |
| <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>; |
| } |
| <span class="ident">r2</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">inc_char</span>(<span class="ident">c</span>); |
| <span class="kw">if</span> <span class="ident">r2</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="ident">r2</span>.<span class="ident">end</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="ident">i</span>, <span class="ident">r2</span>); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Create a new empty class from this one.</span> |
| <span class="kw">fn</span> <span class="ident">to_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></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="doccomment">/// Create a byte class from this character class.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Codepoints above 0xFF are removed.</span> |
| <span class="kw">fn</span> <span class="ident">to_byte_class</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">ByteClass</span> { |
| <span class="ident">ByteClass</span>::<span class="ident">new</span>( |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">into_iter</span>() |
| .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">to_byte_range</span>()) |
| .<span class="ident">collect</span>()).<span class="ident">canonicalize</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">-></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">-></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="kw-2">*</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="kw">pub</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">-></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">-></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="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { |
| <span class="comment">// Inverting an empty range yields all of Unicode.</span> |
| <span class="kw">return</span> <span class="ident">CharClass</span> { |
| <span class="ident">ranges</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="string">'\x00'</span>, <span class="ident">end</span>: <span class="string">'\u{10ffff}'</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">></span> <span class="string">'\x00'</span> { |
| <span class="ident">inv</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">range</span>(<span class="string">'\x00'</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"><</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">/// N.B. Applying case folding to a negated character class probably</span> |
| <span class="doccomment">/// won't produce the expected result. e.g., `(?i)[^x]` really should</span> |
| <span class="doccomment">/// match any character sans `x` and `X`, but if `[^x]` is negated</span> |
| <span class="doccomment">/// before being case folded, you'll end up matching any character.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">case_fold</span>(<span class="self">self</span>) <span class="op">-></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="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 needs 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="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="doccomment">/// Returns the number of characters that match this class.</span> |
| <span class="kw">fn</span> <span class="ident">num_chars</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">r</span><span class="op">|</span> <span class="number">1</span> <span class="op">+</span> (<span class="ident">r</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">-</span> (<span class="ident">r</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u32</span>)) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="ident">len</span><span class="op">|</span> <span class="ident">acc</span> <span class="op">+</span> <span class="ident">len</span>) |
| <span class="kw">as</span> <span class="ident">usize</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 < start`, then the two values are swapped so that</span> |
| <span class="doccomment">/// the invariant `start <= 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">-></span> <span class="ident">ClassRange</span> { |
| <span class="kw">if</span> <span class="ident">start</span> <span class="op"><=</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">/// Translate this to a byte class.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the start codepoint exceeds 0xFF, then this returns `None`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the end codepoint exceeds 0xFF, then it is set to 0xFF.</span> |
| <span class="kw">fn</span> <span class="ident">to_byte_range</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">start</span> <span class="op">></span> <span class="string">'\u{FF}'</span> { |
| <span class="prelude-val">None</span> |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u8</span>; |
| <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">min</span>(<span class="string">'\u{FF}'</span>, <span class="self">self</span>.<span class="ident">end</span>) <span class="kw">as</span> <span class="ident">u8</span>; |
| <span class="prelude-val">Some</span>(<span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="ident">s</span>, <span class="ident">e</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">-></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">-></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"><=</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">-></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">-></span> <span class="ident">bool</span> { |
| <span class="ident">case_folding</span>::<span class="ident">C_plus_S_both_table</span> |
| .<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="kw-2">&</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">&</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">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">ClassRange</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">table</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">case_folding</span>::<span class="ident">C_plus_S_both_table</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="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="string">'\x00'</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">10</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="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">>=</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_both_result</span>(<span class="ident">c</span>) { |
| <span class="prelude-val">Ok</span>(<span class="ident">i</span>) <span class="op">=></span> { |
| <span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">table</span>[<span class="ident">i</span>..] { |
| <span class="kw">if</span> <span class="ident">c1</span> <span class="op">!=</span> <span class="ident">c</span> { |
| <span class="kw">break</span>; |
| } |
| <span class="kw">if</span> <span class="ident">c2</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">c2</span>; |
| } |
| <span class="ident">end</span> <span class="op">=</span> <span class="ident">c2</span>; |
| } |
| <span class="kw">continue</span>; |
| } |
| <span class="prelude-val">Err</span>(<span class="ident">i</span>) <span class="op">=></span> { |
| <span class="kw">if</span> <span class="ident">i</span> <span class="op"><</span> <span class="ident">table</span>.<span class="ident">len</span>() { |
| <span class="ident">next_case_fold</span> <span class="op">=</span> <span class="ident">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">'\u{10FFFF}'</span>; |
| } |
| <span class="ident">c</span> |
| } |
| }; |
| } |
| <span class="comment">// The fast path. We know this character doesn't have an entry</span> |
| <span class="comment">// in the case folding table.</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"><</span><span class="ident">char</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">char</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="op">&&</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">end</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">ClassRange</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">ClassRange</span>) <span class="op">-></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"><</span><span class="ident">char</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></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="kw-2">*</span><span class="ident">other</span> <span class="op">></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"><</span><span class="ident">ClassRange</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">ClassRange</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></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="kw">impl</span> <span class="ident">ByteClass</span> { |
| <span class="doccomment">/// Create a new class from an existing set of ranges.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">ranges</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span>) <span class="op">-></span> <span class="ident">ByteClass</span> { |
| <span class="ident">ByteClass</span> { <span class="ident">ranges</span>: <span class="ident">ranges</span> } |
| } |
| |
| <span class="doccomment">/// Returns true if `b` is matched by this byte class.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">matches</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</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">b</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">/// Removes the given byte from the class if it exists.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that this takes `O(n)` time in the number of ranges.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">b</span>: <span class="ident">u8</span>) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">b</span>.<span class="ident">partial_cmp</span>(<span class="ident">r</span>).<span class="ident">unwrap</span>()) { |
| <span class="prelude-val">Ok</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="ident">i</span>, |
| <span class="prelude-val">Err</span>(_) <span class="op">=></span> <span class="kw">return</span>, |
| }; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">remove</span>(<span class="ident">i</span>); |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">start</span> <span class="op">==</span> <span class="ident">b</span> { |
| <span class="ident">r</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">saturating_add</span>(<span class="number">1</span>); |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">start</span> <span class="op">></span> <span class="ident">r</span>.<span class="ident">end</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">u8</span>::<span class="ident">MAX</span> { |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="ident">i</span>, <span class="ident">r</span>); |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">end</span> <span class="op">==</span> <span class="ident">b</span> { |
| <span class="ident">r</span>.<span class="ident">end</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">saturating_sub</span>(<span class="number">1</span>); |
| <span class="kw">if</span> <span class="ident">r</span>.<span class="ident">end</span> <span class="op"><</span> <span class="ident">r</span>.<span class="ident">start</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b'\x00'</span> { |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="ident">r</span>); |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">r1</span>, <span class="kw-2">mut</span> <span class="ident">r2</span>) <span class="op">=</span> (<span class="ident">r</span>.<span class="ident">clone</span>(), <span class="ident">r</span>.<span class="ident">clone</span>()); |
| <span class="ident">r1</span>.<span class="ident">end</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">saturating_sub</span>(<span class="number">1</span>); |
| <span class="kw">if</span> <span class="ident">r1</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="ident">r1</span>.<span class="ident">end</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="ident">i</span>, <span class="ident">r1</span>); |
| <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>; |
| } |
| <span class="ident">r2</span>.<span class="ident">start</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">saturating_add</span>(<span class="number">1</span>); |
| <span class="kw">if</span> <span class="ident">r2</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="ident">r2</span>.<span class="ident">end</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">insert</span>(<span class="ident">i</span>, <span class="ident">r2</span>); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Create a new empty class from this one.</span> |
| <span class="kw">fn</span> <span class="ident">to_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">ByteClass</span> { |
| <span class="ident">ByteClass</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="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 `ByteClass` 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">-></span> <span class="ident">ByteClass</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="kw-2">*</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 byte class.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// For all `b` where `b` is a byte, `b` matches `self` if and only if `b`</span> |
| <span class="doccomment">/// does not match `self.negate()`.</span> |
| <span class="kw">pub</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">-></span> <span class="ident">ByteClass</span> { |
| <span class="kw">fn</span> <span class="ident">range</span>(<span class="ident">s</span>: <span class="ident">u8</span>, <span class="ident">e</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">ByteRange</span> { <span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="ident">s</span>, <span class="ident">e</span>) } |
| |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { |
| <span class="comment">// Inverting an empty range yields all bytes.</span> |
| <span class="kw">return</span> <span class="ident">ByteClass</span> { |
| <span class="ident">ranges</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="string">b'\x00'</span>, <span class="ident">end</span>: <span class="string">b'\xff'</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">></span> <span class="string">b'\x00'</span> { |
| <span class="ident">inv</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">range</span>(<span class="string">b'\x00'</span>, <span class="self">self</span>[<span class="number">0</span>].<span class="ident">start</span>.<span class="ident">saturating_sub</span>(<span class="number">1</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">win</span>[<span class="number">0</span>].<span class="ident">end</span>.<span class="ident">saturating_add</span>(<span class="number">1</span>), |
| <span class="ident">win</span>[<span class="number">1</span>].<span class="ident">start</span>.<span class="ident">saturating_sub</span>(<span class="number">1</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"><</span> <span class="ident">u8</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="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">saturating_add</span>(<span class="number">1</span>), |
| <span class="ident">u8</span>::<span class="ident">MAX</span>)); |
| } |
| <span class="ident">inv</span> |
| } |
| |
| <span class="doccomment">/// Apply case folding to this byte class.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This assumes that the bytes in the ranges are ASCII compatible.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// N.B. Applying case folding to a negated character class probably</span> |
| <span class="doccomment">/// won't produce the expected result. e.g., `(?i)[^x]` really should</span> |
| <span class="doccomment">/// match any character sans `x` and `X`, but if `[^x]` is negated</span> |
| <span class="doccomment">/// before being case folded, you'll end up matching any character.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">case_fold</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">ByteClass</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="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="self">self</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="ident">folded</span>.<span class="ident">canonicalize</span>() |
| } |
| |
| <span class="doccomment">/// Returns the number of bytes that match this class.</span> |
| <span class="kw">fn</span> <span class="ident">num_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">ranges</span>.<span class="ident">iter</span>() |
| .<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">r</span><span class="op">|</span> <span class="number">1</span> <span class="op">+</span> (<span class="ident">r</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">-</span> (<span class="ident">r</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u32</span>)) |
| .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="ident">len</span><span class="op">|</span> <span class="ident">acc</span> <span class="op">+</span> <span class="ident">len</span>) |
| <span class="kw">as</span> <span class="ident">usize</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">ByteRange</span> { |
| <span class="doccomment">/// Create a new class range.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If `end < start`, then the two values are swapped so that</span> |
| <span class="doccomment">/// the invariant `start <= end` is preserved.</span> |
| <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">start</span>: <span class="ident">u8</span>, <span class="ident">end</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">ByteRange</span> { |
| <span class="kw">if</span> <span class="ident">start</span> <span class="op"><=</span> <span class="ident">end</span> { |
| <span class="ident">ByteRange</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">ByteRange</span> { <span class="ident">start</span>: <span class="ident">end</span>, <span class="ident">end</span>: <span class="ident">start</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">ByteRange</span>) <span class="op">-></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"><=</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="ident">saturating_add</span>(<span class="number">1</span>) |
| } |
| |
| <span class="doccomment">/// Returns true if and only if the intersection of self and other is non</span> |
| <span class="doccomment">/// empty.</span> |
| <span class="kw">fn</span> <span class="ident">is_intersect_empty</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">ByteRange</span>) <span class="op">-></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">></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">ByteRange</span>) <span class="op">-></span> <span class="ident">ByteRange</span> { |
| <span class="ident">ByteRange</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">/// Apply case folding to this range.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Since case folding might add bytes such that the range is no</span> |
| <span class="doccomment">/// longer contiguous, this returns multiple byte ranges.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This assumes that the bytes in this range are ASCII compatible.</span> |
| <span class="kw">fn</span> <span class="ident">case_fold</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span> { |
| <span class="comment">// So much easier than Unicode case folding!</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ranges</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="self">self</span>]; |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="string">b'a'</span>, <span class="string">b'z'</span>).<span class="ident">is_intersect_empty</span>(<span class="self">self</span>) { |
| <span class="kw">let</span> <span class="ident">lower</span> <span class="op">=</span> <span class="ident">max</span>(<span class="self">self</span>.<span class="ident">start</span>, <span class="string">b'a'</span>); |
| <span class="kw">let</span> <span class="ident">upper</span> <span class="op">=</span> <span class="ident">min</span>(<span class="self">self</span>.<span class="ident">end</span>, <span class="string">b'z'</span>); |
| <span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="ident">lower</span> <span class="op">-</span> <span class="number">32</span>, <span class="ident">upper</span> <span class="op">-</span> <span class="number">32</span>)); |
| } |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="string">b'A'</span>, <span class="string">b'Z'</span>).<span class="ident">is_intersect_empty</span>(<span class="self">self</span>) { |
| <span class="kw">let</span> <span class="ident">lower</span> <span class="op">=</span> <span class="ident">max</span>(<span class="self">self</span>.<span class="ident">start</span>, <span class="string">b'A'</span>); |
| <span class="kw">let</span> <span class="ident">upper</span> <span class="op">=</span> <span class="ident">min</span>(<span class="self">self</span>.<span class="ident">end</span>, <span class="string">b'Z'</span>); |
| <span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="ident">lower</span> <span class="op">+</span> <span class="number">32</span>, <span class="ident">upper</span> <span class="op">+</span> <span class="number">32</span>)); |
| } |
| <span class="ident">ranges</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">ByteClass</span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span> { <span class="kw-2">&</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">ByteClass</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">ByteRange</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"><</span><span class="ident">ByteRange</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">vec</span>::<span class="ident">IntoIter</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></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"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">ByteClass</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">ByteRange</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"><</span><span class="lifetime">'a</span>, <span class="ident">ByteRange</span><span class="op">></span>; |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">ByteRange</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>() } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ByteRange</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">start</span> <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="op">&&</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">end</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">ByteRange</span><span class="op">></span> <span class="kw">for</span> <span class="ident">u8</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">ByteRange</span>) <span class="op">-></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"><</span><span class="ident">u8</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ByteRange</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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">u8</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></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="kw-2">*</span><span class="ident">other</span> <span class="op">></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"><</span><span class="ident">ByteRange</span><span class="op">></span> <span class="kw">for</span> <span class="ident">u8</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">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">ByteRange</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">Empty</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">""</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">=></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">"(?iu:"</span>)); |
| } <span class="kw">else</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">"(?u:"</span>)); |
| } |
| <span class="kw">for</span> <span class="kw-2">&</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">"{}"</span>, <span class="ident">quote_char</span>(<span class="ident">c</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">")"</span>)); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="ident">LiteralBytes</span> { <span class="kw-2">ref</span> <span class="ident">bytes</span>, <span class="ident">casei</span> } <span class="op">=></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">"(?i-u:"</span>)); |
| } <span class="kw">else</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">"(?-u:"</span>)); |
| } |
| <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">bytes</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">"{}"</span>, <span class="ident">quote_byte</span>(<span class="ident">b</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">")"</span>)); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="ident">AnyChar</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?su:.)"</span>), |
| <span class="ident">AnyCharNoNL</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?u:.)"</span>), |
| <span class="ident">AnyByte</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?s-u:.)"</span>), |
| <span class="ident">AnyByteNoNL</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?-u:.)"</span>), |
| <span class="ident">Class</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="ident">cls</span>), |
| <span class="ident">ClassBytes</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="ident">cls</span>), |
| <span class="ident">StartLine</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?m:^)"</span>), |
| <span class="ident">EndLine</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?m:$)"</span>), |
| <span class="ident">StartText</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">r"^"</span>), |
| <span class="ident">EndText</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">r"$"</span>), |
| <span class="ident">WordBoundary</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">r"(?u:\b)"</span>), |
| <span class="ident">NotWordBoundary</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">r"(?u:\B)"</span>), |
| <span class="ident">WordBoundaryAscii</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">r"(?-u:\b)"</span>), |
| <span class="ident">NotWordBoundaryAscii</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">r"(?-u:\B)"</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">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?:{})"</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">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"({})"</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">=></span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"(?P<{}>{})"</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">=></span> { |
| <span class="kw">match</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span> { |
| <span class="kw-2">&</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">></span> <span class="number">1</span> <span class="op">=></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">"(?:{}){}"</span>, <span class="ident">e</span>, <span class="ident">r</span>)) |
| } |
| _ <span class="op">=></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">"{}{}"</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">"?"</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">=></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">"{}"</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">=></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">></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">"|"</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">"{}"</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">ZeroOrOne</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"?"</span>), |
| <span class="ident">ZeroOrMore</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"*"</span>), |
| <span class="ident">OneOrMore</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"+"</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">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{{{},}}"</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">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{{{}}}"</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">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{{{}, {}}}"</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</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">"(?u:["</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="kw">if</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">==</span> <span class="string">'-'</span> <span class="op">||</span> <span class="ident">range</span>.<span class="ident">end</span> <span class="op">==</span> <span class="string">'-'</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">"-"</span>)); |
| <span class="kw">break</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">range</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">range</span>; |
| <span class="kw">if</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">==</span> <span class="string">'-'</span> { |
| <span class="ident">range</span>.<span class="ident">start</span> <span class="op">=</span> ((<span class="ident">range</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u8</span>) <span class="op">+</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">char</span>; |
| } |
| <span class="kw">if</span> <span class="ident">range</span>.<span class="ident">end</span> <span class="op">==</span> <span class="string">'-'</span> { |
| <span class="ident">range</span>.<span class="ident">end</span> <span class="op">=</span> ((<span class="ident">range</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">u8</span>) <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">char</span>; |
| } |
| <span class="kw">if</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">></span> <span class="ident">range</span>.<span class="ident">end</span> { |
| <span class="kw">continue</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">"{}"</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">"])"</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></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">"{}-{}"</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="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ByteClass</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</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">"(?-u:["</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="kw">if</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">==</span> <span class="string">b'-'</span> <span class="op">||</span> <span class="ident">range</span>.<span class="ident">end</span> <span class="op">==</span> <span class="string">b'-'</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">"-"</span>)); |
| <span class="kw">break</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">range</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">range</span>; |
| <span class="kw">if</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">==</span> <span class="string">b'-'</span> { |
| <span class="ident">range</span>.<span class="ident">start</span> <span class="op">+=</span> <span class="number">1</span>; |
| } |
| <span class="kw">if</span> <span class="ident">range</span>.<span class="ident">end</span> <span class="op">==</span> <span class="string">b'-'</span> { |
| <span class="ident">range</span>.<span class="ident">start</span> <span class="op">-=</span> <span class="number">1</span>; |
| } |
| <span class="kw">if</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">></span> <span class="ident">range</span>.<span class="ident">end</span> { |
| <span class="kw">continue</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">"{}"</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">"])"</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">ByteRange</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></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">"{}-{}"</span>, <span class="ident">quote_byte</span>(<span class="self">self</span>.<span class="ident">start</span>), <span class="ident">quote_byte</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"><</span><span class="ident">T</span><span class="op">></span> <span class="op">=</span> ::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Error</span><span class="op">></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<a>.)(?P<a>.)`.</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<>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<0a>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<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">/// Indicates that the regex uses too much nesting.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// (N.B. This error exists because traversing the Expr is recursive and</span> |
| <span class="doccomment">/// an explicit heap allocated stack is not (yet?) used. Regardless, some</span> |
| <span class="doccomment">/// sort of limit must be applied to avoid unbounded memory growth.</span> |
| <span class="ident">StackExhausted</span>, |
| <span class="doccomment">/// A disallowed flag was found (e.g., `u`).</span> |
| <span class="ident">FlagNotAllowed</span>(<span class="ident">char</span>), |
| <span class="doccomment">/// A Unicode class was used when the Unicode (`u`) flag was disabled.</span> |
| <span class="ident">UnicodeNotAllowed</span>, |
| <span class="doccomment">/// InvalidUtf8 indicates that the expression may match non-UTF-8 bytes.</span> |
| <span class="doccomment">/// This never returned if the parser is permitted to allow expressions</span> |
| <span class="doccomment">/// that match arbitrary bytes.</span> |
| <span class="ident">InvalidUtf8</span>, |
| <span class="doccomment">/// A character class was constructed such that it is empty.</span> |
| <span class="doccomment">/// e.g., `[^\d\D]`.</span> |
| <span class="ident">EmptyClass</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'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">&</span><span class="self">self</span>) <span class="op">-></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">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">ErrorKind</span> { |
| <span class="kw-2">&</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">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> { |
| <span class="kw">use</span> <span class="ident">ErrorKind</span>::<span class="kw-2">*</span>; |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">DoubleFlagNegation</span> <span class="op">=></span> <span class="string">"double flag negation"</span>, |
| <span class="ident">DuplicateCaptureName</span>(_) <span class="op">=></span> <span class="string">"duplicate capture name"</span>, |
| <span class="ident">EmptyAlternate</span> <span class="op">=></span> <span class="string">"empty alternate"</span>, |
| <span class="ident">EmptyCaptureName</span> <span class="op">=></span> <span class="string">"empty capture name"</span>, |
| <span class="ident">EmptyFlagNegation</span> <span class="op">=></span> <span class="string">"flag negation without any flags"</span>, |
| <span class="ident">EmptyGroup</span> <span class="op">=></span> <span class="string">"empty group (e.g., '()')"</span>, |
| <span class="ident">InvalidBase10</span>(_) <span class="op">=></span> <span class="string">"invalid base 10 number"</span>, |
| <span class="ident">InvalidBase16</span>(_) <span class="op">=></span> <span class="string">"invalid base 16 number"</span>, |
| <span class="ident">InvalidCaptureName</span>(_) <span class="op">=></span> <span class="string">"invalid capture name"</span>, |
| <span class="ident">InvalidClassRange</span>{..} <span class="op">=></span> <span class="string">"invalid character class range"</span>, |
| <span class="ident">InvalidClassEscape</span>(_) <span class="op">=></span> <span class="string">"invalid escape sequence in class"</span>, |
| <span class="ident">InvalidRepeatRange</span>{..} <span class="op">=></span> <span class="string">"invalid counted repetition range"</span>, |
| <span class="ident">InvalidScalarValue</span>(_) <span class="op">=></span> <span class="string">"invalid Unicode scalar value"</span>, |
| <span class="ident">MissingBase10</span> <span class="op">=></span> <span class="string">"missing count in repetition operator"</span>, |
| <span class="ident">RepeaterExpectsExpr</span> <span class="op">=></span> <span class="string">"repetition operator missing expression"</span>, |
| <span class="ident">RepeaterUnexpectedExpr</span>(_) <span class="op">=></span> <span class="string">"expression cannot be repeated"</span>, |
| <span class="ident">UnclosedCaptureName</span>(_) <span class="op">=></span> <span class="string">"unclosed capture group name"</span>, |
| <span class="ident">UnclosedHex</span> <span class="op">=></span> <span class="string">"unclosed hexadecimal literal"</span>, |
| <span class="ident">UnclosedParen</span> <span class="op">=></span> <span class="string">"unclosed parenthesis"</span>, |
| <span class="ident">UnclosedRepeat</span> <span class="op">=></span> <span class="string">"unclosed counted repetition operator"</span>, |
| <span class="ident">UnclosedUnicodeName</span> <span class="op">=></span> <span class="string">"unclosed Unicode class literal"</span>, |
| <span class="ident">UnexpectedClassEof</span> <span class="op">=></span> <span class="string">"unexpected EOF in character class"</span>, |
| <span class="ident">UnexpectedEscapeEof</span> <span class="op">=></span> <span class="string">"unexpected EOF in escape sequence"</span>, |
| <span class="ident">UnexpectedFlagEof</span> <span class="op">=></span> <span class="string">"unexpected EOF in flags"</span>, |
| <span class="ident">UnexpectedTwoDigitHexEof</span> <span class="op">=></span> <span class="string">"unexpected EOF in hex literal"</span>, |
| <span class="ident">UnopenedParen</span> <span class="op">=></span> <span class="string">"unopened parenthesis"</span>, |
| <span class="ident">UnrecognizedEscape</span>(_) <span class="op">=></span> <span class="string">"unrecognized escape sequence"</span>, |
| <span class="ident">UnrecognizedFlag</span>(_) <span class="op">=></span> <span class="string">"unrecognized flag"</span>, |
| <span class="ident">UnrecognizedUnicodeClass</span>(_) <span class="op">=></span> <span class="string">"unrecognized Unicode class name"</span>, |
| <span class="ident">StackExhausted</span> <span class="op">=></span> <span class="string">"stack exhausted, too much nesting"</span>, |
| <span class="ident">FlagNotAllowed</span>(_) <span class="op">=></span> <span class="string">"flag not allowed"</span>, |
| <span class="ident">UnicodeNotAllowed</span> <span class="op">=></span> <span class="string">"Unicode features not allowed"</span>, |
| <span class="ident">InvalidUtf8</span> <span class="op">=></span> <span class="string">"matching arbitrary bytes is not allowed"</span>, |
| <span class="ident">EmptyClass</span> <span class="op">=></span> <span class="string">"empty character class"</span>, |
| <span class="ident">__Nonexhaustive</span> <span class="op">=></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">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="ident">ErrorKind</span>::<span class="ident">StackExhausted</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">kind</span> { |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Error parsing regex: {}"</span>, <span class="self">self</span>.<span class="ident">kind</span>) |
| } <span class="kw">else</span> { |
| <span class="macro">write</span><span class="macro">!</span>( |
| <span class="ident">f</span>, <span class="string">"Error parsing regex near '{}' at character offset {}: {}"</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">use</span> <span class="ident">ErrorKind</span>::<span class="kw-2">*</span>; |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">DoubleFlagNegation</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Only one negation symbol is allowed in flags."</span>), |
| <span class="ident">DuplicateCaptureName</span>(<span class="kw-2">ref</span> <span class="ident">s</span>) <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Capture name '{}' is used more than once."</span>, <span class="ident">s</span>), |
| <span class="ident">EmptyAlternate</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Alternations cannot be empty."</span>), |
| <span class="ident">EmptyCaptureName</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Capture names cannot be empty."</span>), |
| <span class="ident">EmptyFlagNegation</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Flag negation requires setting at least one flag."</span>), |
| <span class="ident">EmptyGroup</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Empty regex groups (e.g., '()') are not allowed."</span>), |
| <span class="ident">InvalidBase10</span>(<span class="kw-2">ref</span> <span class="ident">s</span>) <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Not a valid base 10 number: '{}'"</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">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Not a valid base 16 number: '{}'"</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">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Invalid capture name: '{}'. Capture names must \ |
| consist of [_a-zA-Z0-9] and are not allowed to \ |
| start with with a number."</span>, <span class="ident">s</span>), |
| <span class="ident">InvalidClassRange</span> { <span class="ident">start</span>, <span class="ident">end</span> } <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Invalid character class range '{}-{}'. \ |
| Character class ranges must start with the smaller \ |
| character, but {} > {}"</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">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Invalid escape sequence in character \ |
| class: '{}'."</span>, <span class="ident">e</span>), |
| <span class="ident">InvalidRepeatRange</span> { <span class="ident">min</span>, <span class="ident">max</span> } <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Invalid counted repetition range: {{{}, {}}}. \ |
| Counted repetition ranges must start with the \ |
| minimum, but {} > {}"</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">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Number does not correspond to a Unicode scalar \ |
| value: '{}'."</span>, <span class="ident">c</span>), |
| <span class="ident">MissingBase10</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Missing maximum in counted reptition operator."</span>), |
| <span class="ident">RepeaterExpectsExpr</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Missing expression for reptition operator."</span>), |
| <span class="ident">RepeaterUnexpectedExpr</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Invalid application of reptition operator to: \ |
| '{}'."</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">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Capture name group for '{}' is not closed. \ |
| (Missing a '>'.)"</span>, <span class="ident">s</span>), |
| <span class="ident">UnclosedHex</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unclosed hexadecimal literal (missing a '}}')."</span>), |
| <span class="ident">UnclosedParen</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unclosed parenthesis."</span>), |
| <span class="ident">UnclosedRepeat</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unclosed counted repetition (missing a '}}')."</span>), |
| <span class="ident">UnclosedUnicodeName</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unclosed Unicode literal (missing a '}}')."</span>), |
| <span class="ident">UnexpectedClassEof</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Character class was not closed before the end of \ |
| the regex (missing a ']')."</span>), |
| <span class="ident">UnexpectedEscapeEof</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Started an escape sequence that didn't finish \ |
| before the end of the regex."</span>), |
| <span class="ident">UnexpectedFlagEof</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Inline flag settings was not closed before the end \ |
| of the regex (missing a ')' or ':')."</span>), |
| <span class="ident">UnexpectedTwoDigitHexEof</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unexpected end of two digit hexadecimal literal."</span>), |
| <span class="ident">UnopenedParen</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unopened parenthesis."</span>), |
| <span class="ident">UnrecognizedEscape</span>(<span class="ident">c</span>) <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unrecognized escape sequence: '\\{}'."</span>, <span class="ident">c</span>), |
| <span class="ident">UnrecognizedFlag</span>(<span class="ident">c</span>) <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unrecognized flag: '{}'. \ |
| (Allowed flags: i, m, s, U, u, x.)"</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">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unrecognized Unicode class name: '{}'."</span>, <span class="ident">s</span>), |
| <span class="ident">StackExhausted</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Exhausted space required to parse regex with too \ |
| much nesting."</span>), |
| <span class="ident">FlagNotAllowed</span>(<span class="ident">flag</span>) <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Use of the flag '{}' is not allowed."</span>, <span class="ident">flag</span>), |
| <span class="ident">UnicodeNotAllowed</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Unicode features are not allowed when the Unicode \ |
| (u) flag is not set."</span>), |
| <span class="ident">InvalidUtf8</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Matching arbitrary bytes is not allowed."</span>), |
| <span class="ident">EmptyClass</span> <span class="op">=></span> |
| <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Empty character classes are not allowed."</span>), |
| <span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// The result of binary search on the simple case folding table.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that this binary search is done on the "both" table, such that</span> |
| <span class="doccomment">/// the index returned corresponds to the *first* location of `c1` in the</span> |
| <span class="doccomment">/// table. The table can then be scanned linearly starting from the position</span> |
| <span class="doccomment">/// returned to find other case mappings for `c1`.</span> |
| <span class="kw">fn</span> <span class="ident">simple_case_fold_both_result</span>(<span class="ident">c1</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">table</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">case_folding</span>::<span class="ident">C_plus_S_both_table</span>; |
| <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">binary_search</span>(<span class="ident">table</span>, <span class="op">|</span><span class="kw-2">&</span>(<span class="ident">c2</span>, _)<span class="op">|</span> <span class="ident">c1</span> <span class="op"><=</span> <span class="ident">c2</span>); |
| <span class="kw">if</span> <span class="ident">i</span> <span class="op">>=</span> <span class="ident">table</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">table</span>[<span class="ident">i</span>].<span class="number">0</span> <span class="op">!=</span> <span class="ident">c1</span> { |
| <span class="prelude-val">Err</span>(<span class="ident">i</span>) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">Ok</span>(<span class="ident">i</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Binary search to find first element such that `pred(T) == true`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Assumes that if `pred(xs[i]) == true` then `pred(xs[i+1]) == true`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If all elements yield `pred(T) == false`, then `xs.len()` is returned.</span> |
| <span class="kw">fn</span> <span class="ident">binary_search</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">xs</span>: <span class="kw-2">&</span>[<span class="ident">T</span>], <span class="kw-2">mut</span> <span class="ident">pred</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">usize</span> |
| <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">left</span>, <span class="kw-2">mut</span> <span class="ident">right</span>) <span class="op">=</span> (<span class="number">0</span>, <span class="ident">xs</span>.<span class="ident">len</span>()); |
| <span class="kw">while</span> <span class="ident">left</span> <span class="op"><</span> <span class="ident">right</span> { |
| <span class="kw">let</span> <span class="ident">mid</span> <span class="op">=</span> (<span class="ident">left</span> <span class="op">+</span> <span class="ident">right</span>) <span class="op">/</span> <span class="number">2</span>; |
| <span class="kw">if</span> <span class="ident">pred</span>(<span class="kw-2">&</span><span class="ident">xs</span>[<span class="ident">mid</span>]) { |
| <span class="ident">right</span> <span class="op">=</span> <span class="ident">mid</span>; |
| } <span class="kw">else</span> { |
| <span class="ident">left</span> <span class="op">=</span> <span class="ident">mid</span> <span class="op">+</span> <span class="number">1</span>; |
| } |
| } |
| <span class="ident">left</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">&</span><span class="ident">str</span>) <span class="op">-></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">'\\'</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">-></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">'\\'</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">quote_byte</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">String</span> { |
| <span class="kw">if</span> <span class="ident">parser</span>::<span class="ident">is_punct</span>(<span class="ident">b</span> <span class="kw">as</span> <span class="ident">char</span>) <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b'\''</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b'"'</span> { |
| <span class="ident">quote_char</span>(<span class="ident">b</span> <span class="kw">as</span> <span class="ident">char</span>) |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">escaped</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="ident">b</span>).<span class="ident">collect</span>(); |
| <span class="ident">String</span>::<span class="ident">from_utf8</span>(<span class="ident">escaped</span>).<span class="ident">unwrap</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">-></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">=></span> <span class="ident">char</span>::<span class="ident">MAX</span>, |
| <span class="string">'\u{D7FF}'</span> <span class="op">=></span> <span class="string">'\u{E000}'</span>, |
| <span class="ident">c</span> <span class="op">=></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">-></span> <span class="ident">char</span> { |
| <span class="kw">match</span> <span class="ident">c</span> { |
| <span class="string">'\x00'</span> <span class="op">=></span> <span class="string">'\x00'</span>, |
| <span class="string">'\u{E000}'</span> <span class="op">=></span> <span class="string">'\u{D7FF}'</span>, |
| <span class="ident">c</span> <span class="op">=></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">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="ident">c</span> { |
| <span class="string">'_'</span> <span class="op">|</span> <span class="string">'0'</span> ... <span class="string">'9'</span> <span class="op">|</span> <span class="string">'a'</span> ... <span class="string">'z'</span> <span class="op">|</span> <span class="string">'A'</span> ... <span class="string">'Z'</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></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">&</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">>=</span> <span class="ident">start</span> <span class="op">&&</span> <span class="ident">c</span> <span class="op"><=</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">></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="doccomment">/// Returns true if and only if `c` is an ASCII word byte.</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_byte</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="ident">b</span> { |
| <span class="string">b'_'</span> <span class="op">|</span> <span class="string">b'0'</span> ... <span class="string">b'9'</span> <span class="op">|</span> <span class="string">b'a'</span> ... <span class="string">b'z'</span> <span class="op">|</span> <span class="string">b'A'</span> ... <span class="string">b'Z'</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</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="ident">ByteClass</span>, <span class="ident">ByteRange</span>, <span class="ident">Expr</span>}; |
| |
| <span class="kw">fn</span> <span class="ident">class</span>(<span class="ident">ranges</span>: <span class="kw-2">&</span>[(<span class="ident">char</span>, <span class="ident">char</span>)]) <span class="op">-></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">bclass</span>(<span class="ident">ranges</span>: <span class="kw-2">&</span>[(<span class="ident">u8</span>, <span class="ident">u8</span>)]) <span class="op">-></span> <span class="ident">ByteClass</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">ByteRange</span>::<span class="ident">new</span>(<span class="ident">c1</span>, <span class="ident">c2</span>)).<span class="ident">collect</span>(); |
| <span class="ident">ByteClass</span>::<span class="ident">new</span>(<span class="ident">ranges</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">e</span>(<span class="ident">re</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">Expr</span> { <span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="ident">re</span>).<span class="ident">unwrap</span>() } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">stack_exhaustion</span>() { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">repeat</span>; |
| |
| <span class="kw">let</span> <span class="ident">open</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">repeat</span>(<span class="string">'('</span>).<span class="ident">take</span>(<span class="number">200</span>).<span class="ident">collect</span>(); |
| <span class="kw">let</span> <span class="ident">close</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">repeat</span>(<span class="string">')'</span>).<span class="ident">take</span>(<span class="number">200</span>).<span class="ident">collect</span>(); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}a{}"</span>, <span class="ident">open</span>, <span class="ident">close</span>)).<span class="ident">is_ok</span>()); |
| |
| <span class="kw">let</span> <span class="ident">open</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">repeat</span>(<span class="string">'('</span>).<span class="ident">take</span>(<span class="number">200</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">collect</span>(); |
| <span class="kw">let</span> <span class="ident">close</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">repeat</span>(<span class="string">')'</span>).<span class="ident">take</span>(<span class="number">200</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">collect</span>(); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}a{}"</span>, <span class="ident">open</span>, <span class="ident">close</span>)).<span class="ident">is_err</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">anchored_start</span>() { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"^a"</span>).<span class="ident">is_anchored_start</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"(^a)"</span>).<span class="ident">is_anchored_start</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"^a|^b"</span>).<span class="ident">is_anchored_start</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"(^a)|(^b)"</span>).<span class="ident">is_anchored_start</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"(^(a|b))"</span>).<span class="ident">is_anchored_start</span>()); |
| |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">e</span>(<span class="string">"^a|b"</span>).<span class="ident">is_anchored_start</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">e</span>(<span class="string">"a|^b"</span>).<span class="ident">is_anchored_start</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">anchored_end</span>() { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"a$"</span>).<span class="ident">is_anchored_end</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"(a$)"</span>).<span class="ident">is_anchored_end</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"a$|b$"</span>).<span class="ident">is_anchored_end</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"(a$)|(b$)"</span>).<span class="ident">is_anchored_end</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">e</span>(<span class="string">"((a|b)$)"</span>).<span class="ident">is_anchored_end</span>()); |
| |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">e</span>(<span class="string">"a$|b"</span>).<span class="ident">is_anchored_end</span>()); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">e</span>(<span class="string">"a|b$"</span>).<span class="ident">is_anchored_end</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">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</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">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>), (<span class="string">'a'</span>, <span class="string">'c'</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">&</span>[ |
| (<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</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">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>), (<span class="string">'w'</span>, <span class="string">'y'</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">&</span>[ |
| (<span class="string">'w'</span>, <span class="string">'z'</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">&</span>[ |
| (<span class="string">'c'</span>, <span class="string">'f'</span>), (<span class="string">'a'</span>, <span class="string">'g'</span>), (<span class="string">'d'</span>, <span class="string">'j'</span>), (<span class="string">'a'</span>, <span class="string">'c'</span>), |
| (<span class="string">'m'</span>, <span class="string">'p'</span>), (<span class="string">'l'</span>, <span class="string">'s'</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">&</span>[ |
| (<span class="string">'a'</span>, <span class="string">'j'</span>), (<span class="string">'l'</span>, <span class="string">'s'</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">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>), (<span class="string">'u'</span>, <span class="string">'w'</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">&</span>[ |
| (<span class="string">'u'</span>, <span class="string">'z'</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">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</span>), (<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>), (<span class="string">'b'</span>, <span class="string">'b'</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">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</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">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\x60'</span>), (<span class="string">'\x62'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>), (<span class="string">'b'</span>, <span class="string">'b'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\x60'</span>), (<span class="string">'\x63'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\x60'</span>), (<span class="string">'\x64'</span>, <span class="string">'\x77'</span>), (<span class="string">'\x7b'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'\x00'</span>, <span class="string">'a'</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">&</span>[ |
| (<span class="string">'\x62'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'a'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\x60'</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">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</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">&</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\u{10FFFD}'</span>), (<span class="string">'\u{10FFFF}'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[ |
| (<span class="string">'\u{10FFFE}'</span>, <span class="string">'\u{10FFFE}'</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">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{D7FF}'</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">&</span>[ |
| (<span class="string">'\u{E000}'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{D7FE}'</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">&</span>[ |
| (<span class="string">'\u{D7FF}'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[(<span class="string">'\u{E000}'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\u{D7FF}'</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">&</span>[(<span class="string">'\u{E001}'</span>, <span class="string">'\u{10FFFF}'</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">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\u{E000}'</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">&</span>[ |
| (<span class="string">'C'</span>, <span class="string">'F'</span>), (<span class="string">'A'</span>, <span class="string">'G'</span>), (<span class="string">'D'</span>, <span class="string">'J'</span>), (<span class="string">'A'</span>, <span class="string">'C'</span>), |
| (<span class="string">'M'</span>, <span class="string">'P'</span>), (<span class="string">'L'</span>, <span class="string">'S'</span>), (<span class="string">'c'</span>, <span class="string">'f'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'J'</span>), (<span class="string">'L'</span>, <span class="string">'S'</span>), |
| (<span class="string">'a'</span>, <span class="string">'j'</span>), (<span class="string">'l'</span>, <span class="string">'s'</span>), |
| (<span class="string">'\u{17F}'</span>, <span class="string">'\u{17F}'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'C'</span>, <span class="string">b'F'</span>), (<span class="string">b'A'</span>, <span class="string">b'G'</span>), (<span class="string">b'D'</span>, <span class="string">b'J'</span>), (<span class="string">b'A'</span>, <span class="string">b'C'</span>), |
| (<span class="string">b'M'</span>, <span class="string">b'P'</span>), (<span class="string">b'L'</span>, <span class="string">b'S'</span>), (<span class="string">b'c'</span>, <span class="string">b'f'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'A'</span>, <span class="string">b'J'</span>), (<span class="string">b'L'</span>, <span class="string">b'S'</span>), |
| (<span class="string">b'a'</span>, <span class="string">b'j'</span>), (<span class="string">b'l'</span>, <span class="string">b's'</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">&</span>[(<span class="string">'A'</span>, <span class="string">'Z'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'Z'</span>), (<span class="string">'a'</span>, <span class="string">'z'</span>), |
| (<span class="string">'\u{17F}'</span>, <span class="string">'\u{17F}'</span>), |
| (<span class="string">'\u{212A}'</span>, <span class="string">'\u{212A}'</span>), |
| ])); |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">class</span>(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'Z'</span>), (<span class="string">'a'</span>, <span class="string">'z'</span>), |
| (<span class="string">'\u{17F}'</span>, <span class="string">'\u{17F}'</span>), |
| (<span class="string">'\u{212A}'</span>, <span class="string">'\u{212A}'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'Z'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'A'</span>, <span class="string">b'Z'</span>), (<span class="string">b'a'</span>, <span class="string">b'z'</span>), |
| ])); |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'A'</span>, <span class="string">b'Z'</span>), (<span class="string">b'a'</span>, <span class="string">b'z'</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">&</span>[(<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'_'</span>, <span class="string">'_'</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">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'_'</span>, <span class="string">'_'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'_'</span>, <span class="string">'_'</span>), (<span class="string">'a'</span>, <span class="string">'a'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'_'</span>, <span class="string">b'_'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'_'</span>, <span class="string">b'_'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'_'</span>, <span class="string">b'_'</span>), (<span class="string">b'a'</span>, <span class="string">b'a'</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">&</span>[(<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'='</span>, <span class="string">'='</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">&</span>[ |
| (<span class="string">'='</span>, <span class="string">'='</span>), (<span class="string">'A'</span>, <span class="string">'A'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'='</span>, <span class="string">'='</span>), (<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'a'</span>, <span class="string">'a'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'='</span>, <span class="string">b'='</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'='</span>, <span class="string">b'='</span>), (<span class="string">b'A'</span>, <span class="string">b'A'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'='</span>, <span class="string">b'='</span>), (<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'a'</span>, <span class="string">b'a'</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">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\x10'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\x10'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\x10'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'\x00'</span>, <span class="string">b'\x10'</span>), |
| ])); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">class_fold_negated</span>() { |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">class</span>(<span class="kw-2">&</span>[(<span class="string">'x'</span>, <span class="string">'x'</span>)]); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cls</span>.<span class="ident">clone</span>().<span class="ident">case_fold</span>(), <span class="ident">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'X'</span>, <span class="string">'X'</span>), (<span class="string">'x'</span>, <span class="string">'x'</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">negate</span>(), <span class="ident">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'W'</span>), (<span class="string">'Y'</span>, <span class="string">'w'</span>), (<span class="string">'y'</span>, <span class="string">'\u{10FFFF}'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'x'</span>, <span class="string">b'x'</span>)]); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cls</span>.<span class="ident">clone</span>().<span class="ident">case_fold</span>(), <span class="ident">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'X'</span>, <span class="string">b'X'</span>), (<span class="string">b'x'</span>, <span class="string">b'x'</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">negate</span>(), <span class="ident">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'\x00'</span>, <span class="string">b'W'</span>), (<span class="string">b'Y'</span>, <span class="string">b'w'</span>), (<span class="string">b'y'</span>, <span class="string">b'\xff'</span>), |
| ])); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">class_fold_single_to_multiple</span>() { |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">class</span>(<span class="kw-2">&</span>[(<span class="string">'k'</span>, <span class="string">'k'</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">class</span>(<span class="kw-2">&</span>[ |
| (<span class="string">'K'</span>, <span class="string">'K'</span>), (<span class="string">'k'</span>, <span class="string">'k'</span>), (<span class="string">'\u{212A}'</span>, <span class="string">'\u{212A}'</span>), |
| ])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'k'</span>, <span class="string">b'k'</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">bclass</span>(<span class="kw-2">&</span>[ |
| (<span class="string">b'K'</span>, <span class="string">b'K'</span>), (<span class="string">b'k'</span>, <span class="string">b'k'</span>), |
| ])); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">class_fold_at</span>() { |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">class</span>(<span class="kw-2">&</span>[(<span class="string">'@'</span>, <span class="string">'@'</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">&</span>[(<span class="string">'@'</span>, <span class="string">'@'</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">class</span>(<span class="kw-2">&</span>[(<span class="string">'@'</span>, <span class="string">'@'</span>)])); |
| |
| <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'@'</span>, <span class="string">b'@'</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">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'@'</span>, <span class="string">b'@'</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">bclass</span>(<span class="kw-2">&</span>[(<span class="string">b'@'</span>, <span class="string">b'@'</span>)])); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">roundtrip_class_hypen</span>() { |
| <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="ident">e</span>(<span class="string">"[-./]"</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"(?u:[-\\.-/])"</span>, <span class="ident">expr</span>.<span class="ident">to_string</span>()); |
| |
| <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="ident">e</span>(<span class="string">"(?-u)[-./]"</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"(?-u:[-\\.-/])"</span>, <span class="ident">expr</span>.<span class="ident">to_string</span>()); |
| } |
| } |
| </pre> |
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