class Twig_TokenParser_Block

class Twig_TokenParser_Block extends Twig_TokenParser {

  /**
   * Parses a token and returns a node.
   *
   * @param Twig_Token $token A Twig_Token instance
   *
   * @return Twig_NodeInterface A Twig_NodeInterface instance
   */
  public function parse(Twig_Token $token) {
    $lineno = $token
      ->getLine();
    $stream = $this->parser
      ->getStream();
    $name = $stream
      ->expect(Twig_Token::NAME_TYPE)
      ->getValue();
    if ($this->parser
      ->hasBlock($name)) {
      throw new Twig_Error_Syntax(sprintf("The block '{$name}' has already been defined line %d", $this->parser
        ->getBlock($name)
        ->getLine()), $lineno);
    }
    $this->parser
      ->setBlock($name, $block = new Twig_Node_Block($name, new Twig_Node(array()), $lineno));
    $this->parser
      ->pushLocalScope();
    $this->parser
      ->pushBlockStack($name);
    if ($stream
      ->test(Twig_Token::BLOCK_END_TYPE)) {
      $stream
        ->next();
      $body = $this->parser
        ->subparse(array(
        $this,
        'decideBlockEnd',
      ), true);
      if ($stream
        ->test(Twig_Token::NAME_TYPE)) {
        $value = $stream
          ->next()
          ->getValue();
        if ($value != $name) {
          throw new Twig_Error_Syntax(sprintf("Expected endblock for block '{$name}' (but %s given)", $value), $lineno);
        }
      }
    }
    else {
      $body = new Twig_Node(array(
        new Twig_Node_Print($this->parser
          ->getExpressionParser()
          ->parseExpression(), $lineno),
      ));
    }
    $stream
      ->expect(Twig_Token::BLOCK_END_TYPE);
    $block
      ->setNode('body', $body);
    $this->parser
      ->popBlockStack();
    $this->parser
      ->popLocalScope();
    return new Twig_Node_BlockReference($name, $lineno, $this
      ->getTag());
  }
  public function decideBlockEnd(Twig_Token $token) {
    return $token
      ->test('endblock');
  }

  /**
   * Gets the tag name associated with this token parser.
   *
   * @return string The tag name
   */
  public function getTag() {
    return 'block';
  }

}