class Twig_TokenParser_If

class Twig_TokenParser_If 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();
    $expr = $this->parser
      ->getExpressionParser()
      ->parseExpression();
    $this->parser
      ->getStream()
      ->expect(Twig_Token::BLOCK_END_TYPE);
    $body = $this->parser
      ->subparse(array(
      $this,
      'decideIfFork',
    ));
    $tests = array(
      $expr,
      $body,
    );
    $else = null;
    $end = false;
    while (!$end) {
      switch ($this->parser
        ->getStream()
        ->next()
        ->getValue()) {
        case 'else':
          $this->parser
            ->getStream()
            ->expect(Twig_Token::BLOCK_END_TYPE);
          $else = $this->parser
            ->subparse(array(
            $this,
            'decideIfEnd',
          ));
          break;
        case 'elseif':
          $expr = $this->parser
            ->getExpressionParser()
            ->parseExpression();
          $this->parser
            ->getStream()
            ->expect(Twig_Token::BLOCK_END_TYPE);
          $body = $this->parser
            ->subparse(array(
            $this,
            'decideIfFork',
          ));
          $tests[] = $expr;
          $tests[] = $body;
          break;
        case 'endif':
          $end = true;
          break;
        default:
          throw new Twig_Error_Syntax(sprintf('Unexpected end of template. Twig was looking for the following tags "else", "elseif", or "endif" to close the "if" block started at line %d)', $lineno), -1);
      }
    }
    $this->parser
      ->getStream()
      ->expect(Twig_Token::BLOCK_END_TYPE);
    return new Twig_Node_If(new Twig_Node($tests), $else, $lineno, $this
      ->getTag());
  }
  public function decideIfFork(Twig_Token $token) {
    return $token
      ->test(array(
      'elseif',
      'else',
      'endif',
    ));
  }
  public function decideIfEnd(Twig_Token $token) {
    return $token
      ->test(array(
      'endif',
    ));
  }

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

}