wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Repo\ChangeOp;

/**
 * Provides traversal interfaces of ChangeOpResult tree
 * @license GPL-2.0-or-later
 */
trait ChangeOpResultTraversal {

    /**
     * creates a new recursive traversable on ChangeOpResult tree
     *
     * ChangeOpResults will be yielded, including inner nodes of ChangeOpsResult.
     * Order of traversal is not defined.
     *
     * @return \Traversable
     */
    public function makeRecursiveTraversable( ChangeOpResult $changeOpResult ) {
        yield from $this->yieldFrom( $changeOpResult );
    }

    private function yieldFrom( ChangeOpResult $changeOpResult ) {
        yield $changeOpResult;

        if ( $changeOpResult instanceof ChangeOpsResult ) {
            foreach ( $changeOpResult->getChangeOpsResults() as $childResult ) {
                yield from $this->yieldFrom( $childResult );
            }
        }
    }

}