Viewing file:  NodeTraverser.php (1.78 KB) -rw-r--r--
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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig;
use Twig\Node\Node;
use Twig\NodeVisitor\NodeVisitorInterface;
/**
* A node traverser.
*
* It visits all nodes and their children and calls the given visitor for each.
*
* @author Fabien Potencier <[email protected]>
*/
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);
}
}
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