class Twig_TokenParser_For in Zircon Profile 8

Loops over each item of a sequence.

<pre> <ul> {% for user in users %} <li>{{ user.username|e }}</li> {% endfor %} </ul> </pre>

Hierarchy

• class \Twig_TokenParser implements Twig_TokenParserInterface
  • class \Twig_TokenParser_For

File

vendor/twig/twig/lib/Twig/TokenParser/For.php, line 24

class Twig_TokenParser_For extends Twig_TokenParser {
  public function parse(Twig_Token $token) {
    $lineno = $token
      ->getLine();
    $stream = $this->parser
      ->getStream();
    $targets = $this->parser
      ->getExpressionParser()
      ->parseAssignmentExpression();
    $stream
      ->expect(Twig_Token::OPERATOR_TYPE, 'in');
    $seq = $this->parser
      ->getExpressionParser()
      ->parseExpression();
    $ifexpr = null;
    if ($stream
      ->nextIf(Twig_Token::NAME_TYPE, 'if')) {
      $ifexpr = $this->parser
        ->getExpressionParser()
        ->parseExpression();
    }
    $stream
      ->expect(Twig_Token::BLOCK_END_TYPE);
    $body = $this->parser
      ->subparse(array(
      $this,
      'decideForFork',
    ));
    if ($stream
      ->next()
      ->getValue() == 'else') {
      $stream
        ->expect(Twig_Token::BLOCK_END_TYPE);
      $else = $this->parser
        ->subparse(array(
        $this,
        'decideForEnd',
      ), true);
    }
    else {
      $else = null;
    }
    $stream
      ->expect(Twig_Token::BLOCK_END_TYPE);
    if (count($targets) > 1) {
      $keyTarget = $targets
        ->getNode(0);
      $keyTarget = new Twig_Node_Expression_AssignName($keyTarget
        ->getAttribute('name'), $keyTarget
        ->getLine());
      $valueTarget = $targets
        ->getNode(1);
      $valueTarget = new Twig_Node_Expression_AssignName($valueTarget
        ->getAttribute('name'), $valueTarget
        ->getLine());
    }
    else {
      $keyTarget = new Twig_Node_Expression_AssignName('_key', $lineno);
      $valueTarget = $targets
        ->getNode(0);
      $valueTarget = new Twig_Node_Expression_AssignName($valueTarget
        ->getAttribute('name'), $valueTarget
        ->getLine());
    }
    if ($ifexpr) {
      $this
        ->checkLoopUsageCondition($stream, $ifexpr);
      $this
        ->checkLoopUsageBody($stream, $body);
    }
    return new Twig_Node_For($keyTarget, $valueTarget, $seq, $ifexpr, $body, $else, $lineno, $this
      ->getTag());
  }
  public function decideForFork(Twig_Token $token) {
    return $token
      ->test(array(
      'else',
      'endfor',
    ));
  }
  public function decideForEnd(Twig_Token $token) {
    return $token
      ->test('endfor');
  }

  // the loop variable cannot be used in the condition
  protected function checkLoopUsageCondition(Twig_TokenStream $stream, Twig_NodeInterface $node) {
    if ($node instanceof Twig_Node_Expression_GetAttr && $node
      ->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node
      ->getNode('node')
      ->getAttribute('name')) {
      throw new Twig_Error_Syntax('The "loop" variable cannot be used in a looping condition.', $node
        ->getLine(), $stream
        ->getFilename());
    }
    foreach ($node as $n) {
      if (!$n) {
        continue;
      }
      $this
        ->checkLoopUsageCondition($stream, $n);
    }
  }

  // check usage of non-defined loop-items
  // it does not catch all problems (for instance when a for is included into another or when the variable is used in an include)
  protected function checkLoopUsageBody(Twig_TokenStream $stream, Twig_NodeInterface $node) {
    if ($node instanceof Twig_Node_Expression_GetAttr && $node
      ->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node
      ->getNode('node')
      ->getAttribute('name')) {
      $attribute = $node
        ->getNode('attribute');
      if ($attribute instanceof Twig_Node_Expression_Constant && in_array($attribute
        ->getAttribute('value'), array(
        'length',
        'revindex0',
        'revindex',
        'last',
      ))) {
        throw new Twig_Error_Syntax(sprintf('The "loop.%s" variable is not defined when looping with a condition.', $attribute
          ->getAttribute('value')), $node
          ->getLine(), $stream
          ->getFilename());
      }
    }

    // should check for parent.loop.XXX usage
    if ($node instanceof Twig_Node_For) {
      return;
    }
    foreach ($node as $n) {
      if (!$n) {
        continue;
      }
      $this
        ->checkLoopUsageBody($stream, $n);
    }
  }
  public function getTag() {
    return 'for';
  }

}

Members

Name	Modifiers	Type	Description	Overrides
Twig_TokenParser::$parser	protected	property
Twig_TokenParser::setParser	public	function	Sets the parser associated with this token parser. Overrides Twig_TokenParserInterface::setParser
Twig_TokenParser_For::checkLoopUsageBody	protected	function
Twig_TokenParser_For::checkLoopUsageCondition	protected	function
Twig_TokenParser_For::decideForEnd	public	function
Twig_TokenParser_For::decideForFork	public	function
Twig_TokenParser_For::getTag	public	function	Gets the tag name associated with this token parser. Overrides Twig_TokenParserInterface::getTag
Twig_TokenParser_For::parse	public	function	Parses a token and returns a node. Overrides Twig_TokenParserInterface::parse