95 lines
2.6 KiB
PHP
95 lines
2.6 KiB
PHP
<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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* (c) 2009 Armin Ronacher
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Tests a condition.
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*
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* <pre>
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* {% if users %}
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* <ul>
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* {% for user in users %}
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* <li>{{ user.username|e }}</li>
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* {% endfor %}
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* </ul>
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* {% endif %}
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* </pre>
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*/
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class Twig_TokenParser_If extends Twig_TokenParser
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{
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/**
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* Parses a token and returns a node.
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*
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* @param Twig_Token $token A Twig_Token instance
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*
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* @return Twig_NodeInterface A Twig_NodeInterface instance
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*/
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public function parse(Twig_Token $token)
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{
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$lineno = $token->getLine();
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$expr = $this->parser->getExpressionParser()->parseExpression();
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$stream = $this->parser->getStream();
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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$body = $this->parser->subparse(array($this, 'decideIfFork'));
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$tests = array($expr, $body);
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$else = null;
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$end = false;
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while (!$end) {
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switch ($stream->next()->getValue()) {
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case 'else':
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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$else = $this->parser->subparse(array($this, 'decideIfEnd'));
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break;
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case 'elseif':
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$expr = $this->parser->getExpressionParser()->parseExpression();
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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$body = $this->parser->subparse(array($this, 'decideIfFork'));
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$tests[] = $expr;
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$tests[] = $body;
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break;
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case 'endif':
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$end = true;
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break;
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default:
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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(), $stream->getFilename());
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}
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}
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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return new Twig_Node_If(new Twig_Node($tests), $else, $lineno, $this->getTag());
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}
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public function decideIfFork(Twig_Token $token)
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{
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return $token->test(array('elseif', 'else', 'endif'));
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}
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public function decideIfEnd(Twig_Token $token)
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{
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return $token->test(array('endif'));
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}
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/**
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* Gets the tag name associated with this token parser.
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*
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* @return string The tag name
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*/
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public function getTag()
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{
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return 'if';
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}
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}
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