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<?php declare( strict_types = 1 ); namespace Wikimedia\Parsoid\Utils; use Wikimedia\Parsoid\DOM\Node; /** * Non-recursive post-order traversal of a DOM tree. / class DOMPostOrder { /* * @suppress PhanEmptyPrivateMethod / private function __construct() { / Not meant to be instantiated. / } /* * Non-recursive post-order traversal of a DOM tree. * @param Node $root * @param callable $visitFunc Called in post-order on each node. / public static function traverse( Node $root, callable $visitFunc ): void { $node = $root; while ( true ) { // Find leftmost (grand)child, and visit that first. while ( $node->firstChild ) { $node = $node->firstChild; } while ( true ) { $visitFunc( $node ); if ( $node === $root ) { return; // Visiting the root is the last thing we do. } / Look for right sibling to continue traversal. / if ( $node->nextSibling ) { $node = $node->nextSibling; / Loop back and visit its leftmost (grand)child first. / break; } / Visit parent only after we've run out of right siblings. */ $node = $node->parentNode; } } } }

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