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<?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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* Loops over each item of a sequence.
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*
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* <pre>
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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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* </pre>
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*/
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class Twig_TokenParser_For extends Twig_TokenParser
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{
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public function parse(Twig_Token $token)
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{
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$lineno = $token->getLine();
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$stream = $this->parser->getStream();
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$targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
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$stream->expect(Twig_Token::OPERATOR_TYPE, 'in');
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$seq = $this->parser->getExpressionParser()->parseExpression();
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$ifexpr = null;
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if ($stream->nextIf(Twig_Token::NAME_TYPE, 'if')) {
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$ifexpr = $this->parser->getExpressionParser()->parseExpression();
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}
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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$body = $this->parser->subparse(array($this, 'decideForFork'));
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if ($stream->next()->getValue() == 'else') {
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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$else = $this->parser->subparse(array($this, 'decideForEnd'), true);
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} else {
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$else = null;
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}
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$stream->expect(Twig_Token::BLOCK_END_TYPE);
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if (count($targets) > 1) {
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$keyTarget = $targets->getNode(0);
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$keyTarget = new Twig_Node_Expression_AssignName($keyTarget->getAttribute('name'), $keyTarget->getLine());
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$valueTarget = $targets->getNode(1);
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$valueTarget = new Twig_Node_Expression_AssignName($valueTarget->getAttribute('name'), $valueTarget->getLine());
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} else {
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$keyTarget = new Twig_Node_Expression_AssignName('_key', $lineno);
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$valueTarget = $targets->getNode(0);
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$valueTarget = new Twig_Node_Expression_AssignName($valueTarget->getAttribute('name'), $valueTarget->getLine());
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}
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if ($ifexpr) {
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$this->checkLoopUsageCondition($stream, $ifexpr);
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$this->checkLoopUsageBody($stream, $body);
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}
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return new Twig_Node_For($keyTarget, $valueTarget, $seq, $ifexpr, $body, $else, $lineno, $this->getTag());
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}
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public function decideForFork(Twig_Token $token)
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{
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return $token->test(array('else', 'endfor'));
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}
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public function decideForEnd(Twig_Token $token)
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{
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return $token->test('endfor');
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}
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// the loop variable cannot be used in the condition
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protected function checkLoopUsageCondition(Twig_TokenStream $stream, Twig_NodeInterface $node)
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{
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if ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node->getNode('node')->getAttribute('name')) {
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throw new Twig_Error_Syntax('The "loop" variable cannot be used in a looping condition.', $node->getLine(), $stream->getFilename());
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}
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foreach ($node as $n) {
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if (!$n) {
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continue;
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}
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$this->checkLoopUsageCondition($stream, $n);
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}
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}
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// check usage of non-defined loop-items
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// it does not catch all problems (for instance when a for is included into another or when the variable is used in an include)
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protected function checkLoopUsageBody(Twig_TokenStream $stream, Twig_NodeInterface $node)
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{
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if ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node->getNode('node')->getAttribute('name')) {
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$attribute = $node->getNode('attribute');
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if ($attribute instanceof Twig_Node_Expression_Constant && in_array($attribute->getAttribute('value'), array('length', 'revindex0', 'revindex', 'last'))) {
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throw new Twig_Error_Syntax(sprintf('The "loop.%s" variable is not defined when looping with a condition.', $attribute->getAttribute('value')), $node->getLine(), $stream->getFilename());
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}
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}
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// should check for parent.loop.XXX usage
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if ($node instanceof Twig_Node_For) {
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return;
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}
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foreach ($node as $n) {
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if (!$n) {
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continue;
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}
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$this->checkLoopUsageBody($stream, $n);
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}
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}
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public function getTag()
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{
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return 'for';
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}
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}
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