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If.php (2484B)

      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 }