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109 lines
3.3 KiB
PHP
109 lines
3.3 KiB
PHP
<?php
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/* Copyright (c) 2019 Geert Bergman (geert@scrivo.nl), highlight.php
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of "highlight.js", "highlight.php", nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Highlight;
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/**
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* A PHP implementation to match JavaScript's RegExp class as closely as possible.
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*
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* A lot of behavior in this class is reversed engineered, so improvements are welcome!
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*
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* @internal
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*
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* @since 9.16.0
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*/
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final class RegEx
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{
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/**
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* @var string
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*/
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public $source;
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/**
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* @var int
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*/
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public $lastIndex = 0;
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/**
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* @param RegEx|string $regex
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*/
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public function __construct($regex)
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{
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$this->source = (string) $regex;
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}
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public function __toString()
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{
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return (string) $this->source;
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}
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/**
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* Run the regular expression against the given string.
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*
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* @since 9.16.0.0
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*
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* @param string $str the string to run this regular expression against
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*
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* @return RegExMatch|null
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*/
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public function exec($str)
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{
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$index = null;
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$results = array();
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preg_match($this->source, $str, $results, PREG_OFFSET_CAPTURE, $this->lastIndex);
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if ($results === null || count($results) === 0) {
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return null;
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}
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foreach ($results as &$result) {
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if ($result[1] !== -1) {
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// Only save the index if it hasn't been set yet
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if ($index === null) {
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$index = $result[1];
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}
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$result = $result[0];
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} else {
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$result = null;
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}
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}
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unset($result);
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$this->lastIndex += strlen($results[0]) + ($index - $this->lastIndex);
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$matches = new RegExMatch($results);
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$matches->index = isset($index) ? $index : 0;
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$matches->input = $str;
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return $matches;
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}
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}
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