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vendor/scrivo/highlight.php/Highlight/RegExUtils.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;
+
+/**
+ * @internal
+ *
+ * @since 9.16.0.0
+ */
+abstract class RegExUtils
+{
+    /**
+     * @param string $value
+     * @param bool   $global
+     * @param bool   $case_insensitive
+     *
+     * @return RegEx
+     */
+    public static function langRe($value, $global, $case_insensitive)
+    {
+        // PCRE allows us to change the definition of "new line." The
+        // `(*ANYCRLF)` matches `\r`, `\n`, and `\r\n` for `$`
+        //
+        //   https://www.pcre.org/original/doc/html/pcrepattern.html
+
+        // PCRE requires us to tell it the string can be UTF-8, so the 'u' modifier
+        // is required. The `u` flag for PCRE is different from JS' unicode flag.
+
+        $escaped = preg_replace('#(?<!\\\)/#um', '\\/', $value);
+        $regex = "/(*ANYCRLF){$escaped}/um" . ($case_insensitive ? "i" : "");
+
+        return new RegEx($regex);
+    }
+}