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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  use Symfony\Component\CssSelector\Parser\Handler;
  15  use Symfony\Component\CssSelector\Parser\Reader;
  16  use Symfony\Component\CssSelector\Parser\Token;
  17  use Symfony\Component\CssSelector\Parser\TokenStream;
  18  
  19  /**
  20   * CSS selector tokenizer.
  21   *
  22   * This component is a port of the Python cssselect library,
  23   * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  24   *
  25   * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
  26   *
  27   * @internal
  28   */
  29  class Tokenizer
  30  {
  31      /**
  32       * @var Handler\HandlerInterface[]
  33       */
  34      private $handlers;
  35  
  36      public function __construct()
  37      {
  38          $patterns = new TokenizerPatterns();
  39          $escaping = new TokenizerEscaping($patterns);
  40  
  41          $this->handlers = [
  42              new Handler\WhitespaceHandler(),
  43              new Handler\IdentifierHandler($patterns, $escaping),
  44              new Handler\HashHandler($patterns, $escaping),
  45              new Handler\StringHandler($patterns, $escaping),
  46              new Handler\NumberHandler($patterns),
  47              new Handler\CommentHandler(),
  48          ];
  49      }
  50  
  51      /**
  52       * Tokenize selector source code.
  53       */
  54      public function tokenize(Reader $reader): TokenStream
  55      {
  56          $stream = new TokenStream();
  57  
  58          while (!$reader->isEOF()) {
  59              foreach ($this->handlers as $handler) {
  60                  if ($handler->handle($reader, $stream)) {
  61                      continue 2;
  62                  }
  63              }
  64  
  65              $stream->push(new Token(Token::TYPE_DELIMITER, $reader->getSubstring(1), $reader->getPosition()));
  66              $reader->moveForward(1);
  67          }
  68  
  69          return $stream
  70              ->push(new Token(Token::TYPE_FILE_END, null, $reader->getPosition()))
  71              ->freeze();
  72      }
  73  }