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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\BlockNode;
  17  use Twig\Node\BlockReferenceNode;
  18  use Twig\Node\Node;
  19  use Twig\Node\PrintNode;
  20  use Twig\Token;
  21  
  22  /**
  23   * Marks a section of a template as being reusable.
  24   *
  25   *  {% block head %}
  26   *    <link rel="stylesheet" href="style.css" />
  27   *    <title>{% block title %}{% endblock %} - My Webpage</title>
  28   *  {% endblock %}
  29   */
  30  final class BlockTokenParser extends AbstractTokenParser
  31  {
  32      public function parse(Token $token)
  33      {
  34          $lineno = $token->getLine();
  35          $stream = $this->parser->getStream();
  36          $name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();
  37          if ($this->parser->hasBlock($name)) {
  38              throw new SyntaxError(sprintf("The block '%s' has already been defined line %d.", $name, $this->parser->getBlock($name)->getTemplateLine()), $stream->getCurrent()->getLine(), $stream->getSourceContext());
  39          }
  40          $this->parser->setBlock($name, $block = new BlockNode($name, new Node([]), $lineno));
  41          $this->parser->pushLocalScope();
  42          $this->parser->pushBlockStack($name);
  43  
  44          if ($stream->nextIf(/* Token::BLOCK_END_TYPE */ 3)) {
  45              $body = $this->parser->subparse([$this, 'decideBlockEnd'], true);
  46              if ($token = $stream->nextIf(/* Token::NAME_TYPE */ 5)) {
  47                  $value = $token->getValue();
  48  
  49                  if ($value != $name) {
  50                      throw new SyntaxError(sprintf('Expected endblock for block "%s" (but "%s" given).', $name, $value), $stream->getCurrent()->getLine(), $stream->getSourceContext());
  51                  }
  52              }
  53          } else {
  54              $body = new Node([
  55                  new PrintNode($this->parser->getExpressionParser()->parseExpression(), $lineno),
  56              ]);
  57          }
  58          $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
  59  
  60          $block->setNode('body', $body);
  61          $this->parser->popBlockStack();
  62          $this->parser->popLocalScope();
  63  
  64          return new BlockReferenceNode($name, $lineno, $this->getTag());
  65      }
  66  
  67      public function decideBlockEnd(Token $token)
  68      {
  69          return $token->test('endblock');
  70      }
  71  
  72      public function getTag()
  73      {
  74          return 'block';
  75      }
  76  }
  77  
  78  class_alias('Twig\TokenParser\BlockTokenParser', 'Twig_TokenParser_Block');