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NodeTraverser.php
*/ final class NodeTraverser { private $env; private $visitors = []; /** * @param NodeVisitorInterface[] $visitors */ public function __construct(Environment $env, array $visitors = []) { $this->env = $env; foreach ($visitors as $visitor) { $this->addVisitor($visitor); } } public function addVisitor(NodeVisitorInterface $visitor): void { $this->visitors[$visitor->getPriority()][] = $visitor; } /** * Traverses a node and calls the registered visitors. */ public function traverse(Node $node): Node { ksort($this->visitors); foreach ($this->visitors as $visitors) { foreach ($visitors as $visitor) { $node = $this->traverseForVisitor($visitor, $node); } } return $node; } private function traverseForVisitor(NodeVisitorInterface $visitor, Node $node): ?Node { $node = $visitor->enterNode($node, $this->env); foreach ($node as $k => $n) { if (null !== $m = $this->traverseForVisitor($visitor, $n)) { if ($m !== $n) { $node->setNode($k, $m); } } else { $node->removeNode($k); } } return $visitor->leaveNode($node, $this->env); } }