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vendor/scrivo/highlight.php/Highlight/RegEx.php

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