108 lines
3.3 KiB
PHP
108 lines
3.3 KiB
PHP
<?php
|
|
|
|
class Twig_NodeVisitor_SafeAnalysis implements Twig_NodeVisitorInterface
|
|
{
|
|
protected $data = array();
|
|
|
|
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'];
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
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)) {
|
|
$this->setSafe($node, $filter->getSafe($args));
|
|
} 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());
|
|
}
|
|
} 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;
|
|
}
|
|
}
|