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<?php |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js) |
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* - (c) John MacFarlane |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Node; |
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final class NodeWalker |
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{ |
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/** |
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* @var Node |
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*/ |
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private $root; |
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/** |
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* @var Node|null |
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*/ |
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private $current; |
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/** |
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* @var bool |
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*/ |
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private $entering; |
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/** |
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* @param Node $root |
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*/ |
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public function __construct(Node $root) |
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{ |
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$this->root = $root; |
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$this->current = $this->root; |
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$this->entering = true; |
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} |
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/** |
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* Returns an event which contains node and entering flag |
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* (entering is true when we enter a Node from a parent or sibling, |
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* and false when we reenter it from child) |
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* |
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* @return NodeWalkerEvent|null |
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*/ |
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public function next(): ?NodeWalkerEvent |
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{ |
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$current = $this->current; |
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$entering = $this->entering; |
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if (null === $current) { |
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return null; |
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} |
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if ($entering && $current->isContainer()) { |
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if ($current->firstChild()) { |
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$this->current = $current->firstChild(); |
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$this->entering = true; |
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} else { |
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$this->entering = false; |
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} |
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} elseif ($current === $this->root) { |
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$this->current = null; |
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} elseif (null === $current->next()) { |
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$this->current = $current->parent(); |
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$this->entering = false; |
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} else { |
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$this->current = $current->next(); |
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$this->entering = true; |
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} |
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return new NodeWalkerEvent($current, $entering); |
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} |
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/** |
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* Resets the iterator to resume at the specified node |
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* |
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* @param Node $node |
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* @param bool $entering |
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*/ |
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public function resumeAt(Node $node, bool $entering = true) |
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{ |
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$this->current = $node; |
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$this->entering = $entering; |
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} |
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} |
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thephpleague /
commonmark
