<?php
namespace MailPoetVendor\Twig;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Twig\Node\Node;
use MailPoetVendor\Twig\NodeVisitor\NodeVisitorInterface;
final class NodeTraverser
{
private $env;
private $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;
}
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);
}
}