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<?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.
*/
/**
* Tests a condition.
*
* <pre>
* {% if users %}
* <ul>
* {% for user in users %}
* <li>{{ user.username|e }}</li>
* {% endfor %}
* </ul>
* {% endif %}
* </pre>
*/
class Twig_TokenParser_If 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();
$expr = $this->parser->getExpressionParser()->parseExpression();
$stream = $this->parser->getStream();
$stream->expect(Twig_Token::BLOCK_END_TYPE);
$body = $this->parser->subparse(array($this, 'decideIfFork'));
$tests = array($expr, $body);
$else = null;
$end = false;
while (!$end) {
switch ($stream->next()->getValue()) {
case 'else':
$stream->expect(Twig_Token::BLOCK_END_TYPE);
$else = $this->parser->subparse(array($this, 'decideIfEnd'));
break;
case 'elseif':
$expr = $this->parser->getExpressionParser()->parseExpression();
$stream->expect(Twig_Token::BLOCK_END_TYPE);
$body = $this->parser->subparse(array($this, 'decideIfFork'));
$tests[] = $expr;
$tests[] = $body;
break;
case 'endif':
$end = true;
break;
default:
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());
}
}
$stream->expect(Twig_Token::BLOCK_END_TYPE);
return new Twig_Node_If(new Twig_Node($tests), $else, $lineno, $this->getTag());
}
public function decideIfFork(Twig_Token $token)
{
return $token->test(array('elseif', 'else', 'endif'));
}
public function decideIfEnd(Twig_Token $token)
{
return $token->test(array('endif'));
}
/**
* Gets the tag name associated with this token parser.
*
* @return string The tag name
*/
public function getTag()
{
return 'if';
}
}
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