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   1  <?php
   2  
   3  /*
   4   * This file is part of Twig.
   5   *
   6   * (c) Fabien Potencier
   7   * (c) 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  namespace Twig\TokenParser;
  14  
  15  use Twig\Error\SyntaxError;
  16  use Twig\Node\IfNode;
  17  use Twig\Node\Node;
  18  use Twig\Token;
  19  
  20  /**
  21   * Tests a condition.
  22   *
  23   *   {% if users %}
  24   *    <ul>
  25   *      {% for user in users %}
  26   *        <li>{{ user.username|e }}</li>
  27   *      {% endfor %}
  28   *    </ul>
  29   *   {% endif %}
  30   */
  31  final class IfTokenParser extends AbstractTokenParser
  32  {
  33      public function parse(Token $token)
  34      {
  35          $lineno = $token->getLine();
  36          $expr = $this->parser->getExpressionParser()->parseExpression();
  37          $stream = $this->parser->getStream();
  38          $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
  39          $body = $this->parser->subparse([$this, 'decideIfFork']);
  40          $tests = [$expr, $body];
  41          $else = null;
  42  
  43          $end = false;
  44          while (!$end) {
  45              switch ($stream->next()->getValue()) {
  46                  case 'else':
  47                      $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
  48                      $else = $this->parser->subparse([$this, 'decideIfEnd']);
  49                      break;
  50  
  51                  case 'elseif':
  52                      $expr = $this->parser->getExpressionParser()->parseExpression();
  53                      $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
  54                      $body = $this->parser->subparse([$this, 'decideIfFork']);
  55                      $tests[] = $expr;
  56                      $tests[] = $body;
  57                      break;
  58  
  59                  case 'endif':
  60                      $end = true;
  61                      break;
  62  
  63                  default:
  64                      throw new SyntaxError(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->getSourceContext());
  65              }
  66          }
  67  
  68          $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
  69  
  70          return new IfNode(new Node($tests), $else, $lineno, $this->getTag());
  71      }
  72  
  73      public function decideIfFork(Token $token)
  74      {
  75          return $token->test(['elseif', 'else', 'endif']);
  76      }
  77  
  78      public function decideIfEnd(Token $token)
  79      {
  80          return $token->test(['endif']);
  81      }
  82  
  83      public function getTag()
  84      {
  85          return 'if';
  86      }
  87  }
  88  
  89  class_alias('Twig\TokenParser\IfTokenParser', 'Twig_TokenParser_If');