Block.php

1. 8.x drupal/core/vendor/twig/twig/lib/Twig/Node/Block.php
2. 8.x drupal/core/vendor/twig/twig/lib/Twig/TokenParser/Block.php
3. 8.x drupal/core/modules/block/lib/Drupal/block/Plugin/views/display/Block.php
4. 8.x drupal/core/modules/block/lib/Drupal/block/Plugin/Core/Entity/Block.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) 2009 Fabien Potencier
 * (c) 2009 Armin Ronacher
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Marks a section of a template as being reusable.
 *
 * <pre>
 *  {% block head %}
 *    <link rel="stylesheet" href="style.css" />
 *    <title>{% block title %}{% endblock %} - My Webpage</title>
 *  {% endblock %}
 * </pre>
 */
class Twig_TokenParser_Block 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();
    $stream = $this->parser
      ->getStream();
    $name = $stream
      ->expect(Twig_Token::NAME_TYPE)
      ->getValue();
    if ($this->parser
      ->hasBlock($name)) {
      throw new Twig_Error_Syntax(sprintf("The block '{$name}' has already been defined line %d", $this->parser
        ->getBlock($name)
        ->getLine()), $stream
        ->getCurrent()
        ->getLine(), $stream
        ->getFilename());
    }
    $this->parser
      ->setBlock($name, $block = new Twig_Node_Block($name, new Twig_Node(array()), $lineno));
    $this->parser
      ->pushLocalScope();
    $this->parser
      ->pushBlockStack($name);
    if ($stream
      ->test(Twig_Token::BLOCK_END_TYPE)) {
      $stream
        ->next();
      $body = $this->parser
        ->subparse(array(
        $this,
        'decideBlockEnd',
      ), true);
      if ($stream
        ->test(Twig_Token::NAME_TYPE)) {
        $value = $stream
          ->next()
          ->getValue();
        if ($value != $name) {
          throw new Twig_Error_Syntax(sprintf("Expected endblock for block '{$name}' (but %s given)", $value), $stream
            ->getCurrent()
            ->getLine(), $stream
            ->getFilename());
        }
      }
    }
    else {
      $body = new Twig_Node(array(
        new Twig_Node_Print($this->parser
          ->getExpressionParser()
          ->parseExpression(), $lineno),
      ));
    }
    $stream
      ->expect(Twig_Token::BLOCK_END_TYPE);
    $block
      ->setNode('body', $body);
    $this->parser
      ->popBlockStack();
    $this->parser
      ->popLocalScope();
    return new Twig_Node_BlockReference($name, $lineno, $this
      ->getTag());
  }
  public function decideBlockEnd(Twig_Token $token) {
    return $token
      ->test('endblock');
  }

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

}