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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>
 *
 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
 *  - (c) John MacFarlane
 *
 * 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;

final class NodeWalker
{
    /** @psalm-readonly */
    private Node $root;

    /** @psalm-readonly-allow-private-mutation */
    private ?Node $current = null;

    /** @psalm-readonly-allow-private-mutation */
    private bool $entering;

    public function __construct(Node $root)
    {
        $this->root     = $root;
        $this->current  = $this->root;
        $this->entering = true;
    }

    /**
     * Returns an event which contains node and entering flag
     * (entering is true when we enter a Node from a parent or sibling,
     * and false when we reenter it from child)
     */
    public function next(): ?NodeWalkerEvent
    {
        $current  = $this->current;
        $entering = $this->entering;
        if ($current === null) {
            return null;
        }

        if ($entering && ($current instanceof AbstractBlock || $current->hasChildren())) {
            if ($current->firstChild()) {
                $this->current  = $current->firstChild();
                $this->entering = true;
            } else {
                $this->entering = false;
            }
        } elseif ($current === $this->root) {
            $this->current = null;
        } elseif ($current->next() === null) {
            $this->current  = $current->parent();
            $this->entering = false;
        } else {
            $this->current  = $current->next();
            $this->entering = true;
        }

        return new NodeWalkerEvent($current, $entering);
    }

    /**
     * Resets the iterator to resume at the specified node
     */
    public function resumeAt(Node $node, bool $entering = true): void
    {
        $this->current  = $node;
        $this->entering = $entering;
    }
}

Filemanager

Name Type Size Permission Actions
Block Folder 0755
Inline Folder 0755
Query Folder 0755
Node.php File 6.31 KB 0644
NodeIterator.php File 1.35 KB 0644
NodeWalker.php File 2.15 KB 0644
NodeWalkerEvent.php File 893 B 0644
Query.php File 3.23 KB 0644
RawMarkupContainerInterface.php File 465 B 0644
StringContainerHelper.php File 1.32 KB 0644
StringContainerInterface.php File 640 B 0644