TokenizerEscaping.php

<?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 {
    public function __construct(TokenizerPatterns $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);
    }

}