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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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 &lt;jeanfrancois.simon@sensiolabs.com&gt;
 *
 * @internal
 */
class TokenizerEscaping
{
    private $patterns;

    public function __construct(TokenizerPatterns $patterns)
    {
        $this-&gt;patterns = $patterns;
    }

    public function escapeUnicode(string $value): string
    {
        $value = $this-&gt;replaceUnicodeSequences($value);

        return preg_replace($this-&gt;patterns-&gt;getSimpleEscapePattern(), '$1', $value);
    }

    public function escapeUnicodeAndNewLine(string $value): string
    {
        $value = preg_replace($this-&gt;patterns-&gt;getNewLineEscapePattern(), '', $value);

        return $this-&gt;escapeUnicode($value);
    }

    private function replaceUnicodeSequences(string $value): string
    {
        return preg_replace_callback($this-&gt;patterns-&gt;getUnicodeEscapePattern(), function ($match) {
            $c = hexdec($match[1]);

            if (0x80 &gt; $c %= 0x200000) {
                return \chr($c);
            }
            if (0x800 &gt; $c) {
                return \chr(0xC0 | $c &gt;&gt; 6).\chr(0x80 | $c &amp; 0x3F);
            }
            if (0x10000 &gt; $c) {
                return \chr(0xE0 | $c &gt;&gt; 12).\chr(0x80 | $c &gt;&gt; 6 &amp; 0x3F).\chr(0x80 | $c &amp; 0x3F);
            }

            return '';
        }, $value);
    }
}
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