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<?php
declare(strict_types=1);
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Node;
use League\CommonMark\Node\Block\AbstractBlock;
/**
* @implements \IteratorAggregate<int, Node>
*/
final class NodeIterator implements \IteratorAggregate
{
public const FLAG_BLOCKS_ONLY = 1;
private Node $node;
private bool $blocksOnly;
public function __construct(Node $node, int $flags = 0)
{
$this->node = $node;
$this->blocksOnly = ($flags & self::FLAG_BLOCKS_ONLY) === self::FLAG_BLOCKS_ONLY;
}
/**
* @return \Generator<int, Node>
*/
public function getIterator(): \Generator
{
$stack = [$this->node];
$index = 0;
while ($stack) {
$node = \array_pop($stack);
yield $index++ => $node;
// Push all children onto the stack in reverse order
$child = $node->lastChild();
while ($child !== null) {
if (! $this->blocksOnly || $child instanceof AbstractBlock) {
$stack[] = $child;
}
$child = $child->previous();
}
}
}
}