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

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+<?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
+{
+    private TokenizerPatterns $patterns;
+
+    public function __construct(TokenizerPatterns $patterns)
+    {
+        $this->patterns = $patterns;
+    }
+
+    public function escapeUnicode(string $value): string
+    {
+        $value = $this->replaceUnicodeSequences($value);
+
+        return preg_replace($this->patterns->getSimpleEscapePattern(), '$1', $value);
+    }
+
+    public function escapeUnicodeAndNewLine(string $value): string
+    {
+        $value = preg_replace($this->patterns->getNewLineEscapePattern(), '', $value);
+
+        return $this->escapeUnicode($value);
+    }
+
+    private function replaceUnicodeSequences(string $value): string
+    {
+        return preg_replace_callback($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);
+            }
+
+            return '';
+        }, $value);
+    }
+}