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< ? php
/*
* This file is part of Twig .
*
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* ( c ) Fabien Potencier
* ( c ) Armin Ronacher
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*
* For the full copyright and license information , please view the LICENSE
* file that was distributed with this source code .
*/
/**
* Loops over each item of a sequence .
*
* < pre >
* < ul >
* { % for user in users % }
* < li > {{ user . username | e }} </ li >
* { % endfor % }
* </ ul >
* </ pre >
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*
* @ final
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*/
class Twig_TokenParser_For extends Twig_TokenParser
{
public function parse ( Twig_Token $token )
{
$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 ();
$ifexpr = null ;
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if ( $stream -> nextIf ( Twig_Token :: NAME_TYPE , 'if' )) {
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$ifexpr = $this -> parser -> getExpressionParser () -> parseExpression ();
}
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$stream -> expect ( Twig_Token :: BLOCK_END_TYPE );
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$body = $this -> parser -> subparse ( array ( $this , 'decideForFork' ));
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if ( 'else' == $stream -> next () -> getValue ()) {
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$stream -> expect ( Twig_Token :: BLOCK_END_TYPE );
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$else = $this -> parser -> subparse ( array ( $this , 'decideForEnd' ), true );
} else {
$else = null ;
}
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$stream -> expect ( Twig_Token :: BLOCK_END_TYPE );
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if ( count ( $targets ) > 1 ) {
$keyTarget = $targets -> getNode ( 0 );
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$keyTarget = new Twig_Node_Expression_AssignName ( $keyTarget -> getAttribute ( 'name' ), $keyTarget -> getTemplateLine ());
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$valueTarget = $targets -> getNode ( 1 );
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$valueTarget = new Twig_Node_Expression_AssignName ( $valueTarget -> getAttribute ( 'name' ), $valueTarget -> getTemplateLine ());
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} else {
$keyTarget = new Twig_Node_Expression_AssignName ( '_key' , $lineno );
$valueTarget = $targets -> getNode ( 0 );
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$valueTarget = new Twig_Node_Expression_AssignName ( $valueTarget -> getAttribute ( 'name' ), $valueTarget -> getTemplateLine ());
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}
if ( $ifexpr ) {
$this -> checkLoopUsageCondition ( $stream , $ifexpr );
$this -> checkLoopUsageBody ( $stream , $body );
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}
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' );
}
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// 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' )) {
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throw new Twig_Error_Syntax ( 'The "loop" variable cannot be used in a looping condition.' , $node -> getTemplateLine (), $stream -> getSourceContext ());
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}
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' ))) {
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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 -> getTemplateLine (), $stream -> getSourceContext ());
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}
}
// 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 );
}
}
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public function getTag ()
{
return 'for' ;
}
}
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class_alias ( 'Twig_TokenParser_For' , 'Twig\TokenParser\ForTokenParser' , false );