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   1  <?php
   2  
   3  /*
   4   * This file is part of Twig.
   5   *
   6   * (c) 2009 Fabien Potencier
   7   * (c) 2009 Armin Ronacher
   8   *
   9   * For the full copyright and license information, please view the LICENSE
  10   * file that was distributed with this source code.
  11   */
  12  
  13  /**
  14   * Tests a condition.
  15   *
  16   * <pre>
  17   * {% if users %}
  18   *  <ul>
  19   *    {% for user in users %}
  20   *      <li>{{ user.username|e }}</li>
  21   *    {% endfor %}
  22   *  </ul>
  23   * {% endif %}
  24   * </pre>
  25   */
  26  class Twig_TokenParser_If extends Twig_TokenParser
  27  {
  28      public function parse(Twig_Token $token)
  29      {
  30          $lineno = $token->getLine();
  31          $expr = $this->parser->getExpressionParser()->parseExpression();
  32          $stream = $this->parser->getStream();
  33          $stream->expect(Twig_Token::BLOCK_END_TYPE);
  34          $body = $this->parser->subparse(array($this, 'decideIfFork'));
  35          $tests = array($expr, $body);
  36          $else = null;
  37  
  38          $end = false;
  39          while (!$end) {
  40              switch ($stream->next()->getValue()) {
  41                  case 'else':
  42                      $stream->expect(Twig_Token::BLOCK_END_TYPE);
  43                      $else = $this->parser->subparse(array($this, 'decideIfEnd'));
  44                      break;
  45  
  46                  case 'elseif':
  47                      $expr = $this->parser->getExpressionParser()->parseExpression();
  48                      $stream->expect(Twig_Token::BLOCK_END_TYPE);
  49                      $body = $this->parser->subparse(array($this, 'decideIfFork'));
  50                      $tests[] = $expr;
  51                      $tests[] = $body;
  52                      break;
  53  
  54                  case 'endif':
  55                      $end = true;
  56                      break;
  57  
  58                  default:
  59                      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), $stream->getCurrent()->getLine(), $stream->getFilename());
  60              }
  61          }
  62  
  63          $stream->expect(Twig_Token::BLOCK_END_TYPE);
  64  
  65          return new Twig_Node_If(new Twig_Node($tests), $else, $lineno, $this->getTag());
  66      }
  67  
  68      public function decideIfFork(Twig_Token $token)
  69      {
  70          return $token->test(array('elseif', 'else', 'endif'));
  71      }
  72  
  73      public function decideIfEnd(Twig_Token $token)
  74      {
  75          return $token->test(array('endif'));
  76      }
  77  
  78      public function getTag()
  79      {
  80          return 'if';
  81      }
  82  }