--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Parser\Tokenizer;
+
+/**
+ * CSS selector tokenizer escaping applier.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+class TokenizerEscaping
+{
+ /**
+ * @var TokenizerPatterns
+ */
+ private $patterns;
+
+ /**
+ * @param TokenizerPatterns $patterns
+ */
+ public function __construct(TokenizerPatterns $patterns)
+ {
+ $this->patterns = $patterns;
+ }
+
+ /**
+ * @param string $value
+ *
+ * @return string
+ */
+ public function escapeUnicode($value)
+ {
+ $value = $this->replaceUnicodeSequences($value);
+
+ return preg_replace($this->patterns->getSimpleEscapePattern(), '$1', $value);
+ }
+
+ /**
+ * @param string $value
+ *
+ * @return string
+ */
+ public function escapeUnicodeAndNewLine($value)
+ {
+ $value = preg_replace($this->patterns->getNewLineEscapePattern(), '', $value);
+
+ return $this->escapeUnicode($value);
+ }
+
+ /**
+ * @param string $value
+ *
+ * @return string
+ */
+ private function replaceUnicodeSequences($value)
+ {
+ return preg_replace_callback($this->patterns->getUnicodeEscapePattern(), function ($match) {
+ $c = hexdec($match[1]);
+
+ if (0x80 > $c %= 0x200000) {
+ return chr($c);
+ }
+ if (0x800 > $c) {
+ return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
+ }
+ if (0x10000 > $c) {
+ return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
+ }
+ }, $value);
+ }
+}