36     public function getSafe(Node $node)  argument
38         $hash = spl_object_hash($node);
44             if ($bucket['key'] !== $node) {
56     private function setSafe(Node $node, array $safe)  argument
58         $hash = spl_object_hash($node);
61                 if ($bucket['key'] === $node) {
69             'key' => $node,
74     protected function doEnterNode(Node $node, Environment $env)  argument
76         return $node;
79     protected function doLeaveNode(Node $node, Environment $env)  argument
81         if ($node instanceof ConstantExpression) {
83             $this->setSafe($node, ['all']);
84         } elseif ($node instanceof BlockReferenceExpression) {
86             $this->setSafe($node, ['all']);
87         } elseif ($node instanceof ParentExpression) {
89             $this->setSafe($node, ['all']);
90         } elseif ($node instanceof ConditionalExpression) {
92 …$safe = $this->intersectSafe($this->getSafe($node->getNode('expr2')), $this->getSafe($node->getNod…
93             $this->setSafe($node, $safe);
94         } elseif ($node instanceof FilterExpression) {
96             $name = $node->getNode('filter')->getAttribute('value');
97             $args = $node->getNode('arguments');
101 …$safe = $this->intersectSafe($this->getSafe($node->getNode('node')), $filter->getPreservesSafety()…
103                 $this->setSafe($node, $safe);
105                 $this->setSafe($node, []);
107         } elseif ($node instanceof FunctionExpression) {
109             $name = $node->getAttribute('name');
110             $args = $node->getNode('arguments');
113                 $this->setSafe($node, $function->getSafe($args));
115                 $this->setSafe($node, []);
117         } elseif ($node instanceof MethodCallExpression) {
118             if ($node->getAttribute('safe')) {
119                 $this->setSafe($node, ['all']);
121                 $this->setSafe($node, []);
123 …} elseif ($node instanceof GetAttrExpression && $node->getNode('node') instanceof NameExpression) {
124             $name = $node->getNode('node')->getAttribute('name');
126                 $this->setSafe($node, ['all']);
128                 $this->setSafe($node, []);
131             $this->setSafe($node, []);
134         return $node;