Source of file SafeAnalysis.php
Size: 4,450 Bytes - Last Modified: 2013-06-06T08:06:01+02:00
/home/theseer/Downloads/Symfony/vendor/twig/twig/lib/Twig/NodeVisitor/SafeAnalysis.php
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132 | <?php class Twig_NodeVisitor_SafeAnalysis implements Twig_NodeVisitorInterface { protected $data = array(); protected $safeVars = array(); public function setSafeVars($safeVars) { $this->safeVars = $safeVars; } public function getSafe(Twig_NodeInterface $node) { $hash = spl_object_hash($node); if (isset($this->data[$hash])) { foreach ($this->data[$hash] as $bucket) { if ($bucket['key'] === $node) { return $bucket['value']; } } } } protected function setSafe(Twig_NodeInterface $node, array $safe) { $hash = spl_object_hash($node); if (isset($this->data[$hash])) { foreach ($this->data[$hash] as &$bucket) { if ($bucket['key'] === $node) { $bucket['value'] = $safe; return; } } } $this->data[$hash][] = array( 'key' => $node, 'value' => $safe, ); } public function enterNode(Twig_NodeInterface $node, Twig_Environment $env) { return $node; } public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env) { if ($node instanceof Twig_Node_Expression_Constant) { // constants are marked safe for all $this->setSafe($node, array('all')); } elseif ($node instanceof Twig_Node_Expression_BlockReference) { // blocks are safe by definition $this->setSafe($node, array('all')); } elseif ($node instanceof Twig_Node_Expression_Parent) { // parent block is safe by definition $this->setSafe($node, array('all')); } elseif ($node instanceof 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 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 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 ($node instanceof Twig_Node_Expression_MethodCall) { if ($node->getAttribute('safe')) { $this->setSafe($node, array('all')); } else { $this->setSafe($node, array()); } } elseif ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof 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; } protected function intersectSafe(array $a = null, array $b = null) { if (null === $a || null === $b) { return array(); } if (in_array('all', $a)) { return $b; } if (in_array('all', $b)) { return $a; } return array_intersect($a, $b); } /** * {@inheritdoc} */ public function getPriority() { return 0; } } |