%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Neon;
/** @internal */
final class Traverser
{
public const DontTraverseChildren = 1;
public const StopTraversal = 2;
/** @var callable(Node): (Node|int|null)|null */
private $enter;
/** @var callable(Node): (Node|int|null)|null */
private $leave;
/** @var bool */
private $stop;
/**
* @param callable(Node): (Node|int|null)|null $enter
* @param callable(Node): (Node|int|null)|null $leave
*/
public function traverse(Node $node, ?callable $enter = null, ?callable $leave = null): Node
{
$this->enter = $enter;
$this->leave = $leave;
$this->stop = false;
return $this->traverseNode($node);
}
private function traverseNode(Node $node): Node
{
$children = true;
if ($this->enter) {
$res = ($this->enter)($node);
if ($res instanceof Node) {
$node = $res;
} elseif ($res === self::DontTraverseChildren) {
$children = false;
} elseif ($res === self::StopTraversal) {
$this->stop = true;
$children = false;
}
}
if ($children) {
foreach ($node as &$subnode) {
$subnode = $this->traverseNode($subnode);
if ($this->stop) {
break;
}
}
}
if (!$this->stop && $this->leave) {
$res = ($this->leave)($node);
if ($res instanceof Node) {
$node = $res;
} elseif ($res === self::StopTraversal) {
$this->stop = true;
}
}
return $node;
}
}
Zerion Mini Shell 1.0