Viewing file:  ForTokenParser.php (4.95 KB) -rw-r--r--
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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
* (c) Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig\TokenParser;
use Twig\Error\SyntaxError;
use Twig\Node\Expression\AssignNameExpression;
use Twig\Node\Expression\ConstantExpression;
use Twig\Node\Expression\GetAttrExpression;
use Twig\Node\Expression\NameExpression;
use Twig\Node\ForNode;
use Twig\Node\Node;
use Twig\Token;
use Twig\TokenStream;
/**
* Loops over each item of a sequence.
*
* <ul>
* {% for user in users %}
* <li>{{ user.username|e }}</li>
* {% endfor %}
* </ul>
*/
final class ForTokenParser extends AbstractTokenParser
{
public function parse(Token $token)
{
$lineno = $token->getLine();
$stream = $this->parser->getStream();
$targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
$stream->expect(/* Token::OPERATOR_TYPE */ 8, 'in');
$seq = $this->parser->getExpressionParser()->parseExpression();
$ifexpr = null;
if ($stream->nextIf(/* Token::NAME_TYPE */ 5, 'if')) {
@trigger_error(sprintf('Using an "if" condition on "for" tag in "%s" at line %d is deprecated since Twig 2.10.0, use a "filter" filter or an "if" condition inside the "for" body instead (if your condition depends on a variable updated inside the loop).', $stream->getSourceContext()->getName(), $lineno), E_USER_DEPRECATED);
$ifexpr = $this->parser->getExpressionParser()->parseExpression();
}
$stream->expect(/* Token::BLOCK_END_TYPE */ 3);
$body = $this->parser->subparse([$this, 'decideForFork']);
if ('else' == $stream->next()->getValue()) {
$stream->expect(/* Token::BLOCK_END_TYPE */ 3);
$else = $this->parser->subparse([$this, 'decideForEnd'], true);
} else {
$else = null;
}
$stream->expect(/* Token::BLOCK_END_TYPE */ 3);
if (\count($targets) > 1) {
$keyTarget = $targets->getNode(0);
$keyTarget = new AssignNameExpression($keyTarget->getAttribute('name'), $keyTarget->getTemplateLine());
$valueTarget = $targets->getNode(1);
$valueTarget = new AssignNameExpression($valueTarget->getAttribute('name'), $valueTarget->getTemplateLine());
} else {
$keyTarget = new AssignNameExpression('_key', $lineno);
$valueTarget = $targets->getNode(0);
$valueTarget = new AssignNameExpression($valueTarget->getAttribute('name'), $valueTarget->getTemplateLine());
}
if ($ifexpr) {
$this->checkLoopUsageCondition($stream, $ifexpr);
$this->checkLoopUsageBody($stream, $body);
}
return new ForNode($keyTarget, $valueTarget, $seq, $ifexpr, $body, $else, $lineno, $this->getTag());
}
public function decideForFork(Token $token)
{
return $token->test(['else', 'endfor']);
}
public function decideForEnd(Token $token)
{
return $token->test('endfor');
}
// the loop variable cannot be used in the condition
private function checkLoopUsageCondition(TokenStream $stream, Node $node)
{
if ($node instanceof GetAttrExpression && $node->getNode('node') instanceof NameExpression && 'loop' == $node->getNode('node')->getAttribute('name')) {
throw new SyntaxError('The "loop" variable cannot be used in a looping condition.', $node->getTemplateLine(), $stream->getSourceContext());
}
foreach ($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)
private function checkLoopUsageBody(TokenStream $stream, Node $node)
{
if ($node instanceof GetAttrExpression && $node->getNode('node') instanceof NameExpression && 'loop' == $node->getNode('node')->getAttribute('name')) {
$attribute = $node->getNode('attribute');
if ($attribute instanceof ConstantExpression && \in_array($attribute->getAttribute('value'), ['length', 'revindex0', 'revindex', 'last'])) {
throw new SyntaxError(sprintf('The "loop.%s" variable is not defined when looping with a condition.', $attribute->getAttribute('value')), $node->getTemplateLine(), $stream->getSourceContext());
}
}
// should check for parent.loop.XXX usage
if ($node instanceof ForNode) {
return;
}
foreach ($node as $n) {
if (!$n) {
continue;
}
$this->checkLoopUsageBody($stream, $n);
}
}
public function getTag()
{
return 'for';
}
}
class_alias('Twig\TokenParser\ForTokenParser', 'Twig_TokenParser_For');
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