Exemplo n.º 1
0
 public function leaveNode(IfwPsn_Vendor_Twig_NodeInterface $node, IfwPsn_Vendor_Twig_Environment $env)
 {
     if ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_Constant) {
         // constants are marked safe for all
         $this->setSafe($node, array('all'));
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_BlockReference) {
         // blocks are safe by definition
         $this->setSafe($node, array('all'));
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_Parent) {
         // parent block is safe by definition
         $this->setSafe($node, array('all'));
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_Conditional) {
         // intersect safeness of both operands
         $safe = $this->intersectSafe($this->getSafe($node->getNode('expr2')), $this->getSafe($node->getNode('expr3')));
         $this->setSafe($node, $safe);
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_Filter) {
         // filter expression is safe when the filter is safe
         $name = $node->getNode('filter')->getAttribute('value');
         $args = $node->getNode('arguments');
         if (false !== ($filter = $env->getFilter($name))) {
             $safe = $filter->getSafe($args);
             if (null === $safe) {
                 $safe = $this->intersectSafe($this->getSafe($node->getNode('node')), $filter->getPreservesSafety());
             }
             $this->setSafe($node, $safe);
         } else {
             $this->setSafe($node, array());
         }
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_Function) {
         // function expression is safe when the function is safe
         $name = $node->getAttribute('name');
         $args = $node->getNode('arguments');
         $function = $env->getFunction($name);
         if (false !== $function) {
             $this->setSafe($node, $function->getSafe($args));
         } else {
             $this->setSafe($node, array());
         }
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_MethodCall) {
         if ($node->getAttribute('safe')) {
             $this->setSafe($node, array('all'));
         } else {
             $this->setSafe($node, array());
         }
     } elseif ($node instanceof IfwPsn_Vendor_Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof IfwPsn_Vendor_Twig_Node_Expression_Name) {
         $name = $node->getNode('node')->getAttribute('name');
         // attributes on template instances are safe
         if ('_self' == $name || in_array($name, $this->safeVars)) {
             $this->setSafe($node, array('all'));
         } else {
             $this->setSafe($node, array());
         }
     } else {
         $this->setSafe($node, array());
     }
     return $node;
 }