Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/css-selector/Parser/Tokenizer/TokenizerEscaping.php

@@ -0,0 +1,82 @@
+<?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>
+ */
+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);
+    }
+}