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<?php |
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|
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/* |
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* This file is part of Twig. |
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* |
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* (c) Fabien Potencier |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace ElementorDeps\Twig; |
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|
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use ElementorDeps\Twig\Node\Node; |
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use ElementorDeps\Twig\NodeVisitor\NodeVisitorInterface; |
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/** |
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* A node traverser. |
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* |
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* It visits all nodes and their children and calls the given visitor for each. |
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* |
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* @author Fabien Potencier <fabien@symfony.com> |
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*/ |
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final class NodeTraverser |
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{ |
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private $env; |
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private $visitors = []; |
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/** |
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* @param NodeVisitorInterface[] $visitors |
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*/ |
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public function __construct(Environment $env, array $visitors = []) |
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{ |
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$this->env = $env; |
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foreach ($visitors as $visitor) { |
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$this->addVisitor($visitor); |
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} |
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} |
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public function addVisitor(NodeVisitorInterface $visitor) : void |
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{ |
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$this->visitors[$visitor->getPriority()][] = $visitor; |
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} |
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/** |
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* Traverses a node and calls the registered visitors. |
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*/ |
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public function traverse(Node $node) : Node |
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{ |
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\ksort($this->visitors); |
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foreach ($this->visitors as $visitors) { |
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foreach ($visitors as $visitor) { |
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$node = $this->traverseForVisitor($visitor, $node); |
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} |
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} |
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return $node; |
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} |
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private function traverseForVisitor(NodeVisitorInterface $visitor, Node $node) : ?Node |
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{ |
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$node = $visitor->enterNode($node, $this->env); |
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foreach ($node as $k => $n) { |
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if (null !== ($m = $this->traverseForVisitor($visitor, $n))) { |
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if ($m !== $n) { |
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$node->setNode($k, $m); |
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} |
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} else { |
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$node->removeNode($k); |
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} |
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} |
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return $visitor->leaveNode($node, $this->env); |
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} |
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} |
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