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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\CssSelector\Parser\Tokenizer;
  13  
  14  /**
  15   * CSS selector tokenizer escaping applier.
  16   *
  17   * This component is a port of the Python cssselect library,
  18   * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  19   *
  20   * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
  21   *
  22   * @internal
  23   */
  24  class TokenizerEscaping
  25  {
  26      private $patterns;
  27  
  28      public function __construct(TokenizerPatterns $patterns)
  29      {
  30          $this->patterns = $patterns;
  31      }
  32  
  33      public function escapeUnicode(string $value): string
  34      {
  35          $value = $this->replaceUnicodeSequences($value);
  36  
  37          return preg_replace($this->patterns->getSimpleEscapePattern(), '$1', $value);
  38      }
  39  
  40      public function escapeUnicodeAndNewLine(string $value): string
  41      {
  42          $value = preg_replace($this->patterns->getNewLineEscapePattern(), '', $value);
  43  
  44          return $this->escapeUnicode($value);
  45      }
  46  
  47      private function replaceUnicodeSequences(string $value): string
  48      {
  49          return preg_replace_callback($this->patterns->getUnicodeEscapePattern(), function ($match) {
  50              $c = hexdec($match[1]);
  51  
  52              if (0x80 > $c %= 0x200000) {
  53                  return \chr($c);
  54              }
  55              if (0x800 > $c) {
  56                  return \chr(0xC0 | $c >> 6).\chr(0x80 | $c & 0x3F);
  57              }
  58              if (0x10000 > $c) {
  59                  return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
  60              }
  61  
  62              return '';
  63          }, $value);
  64      }
  65  }