wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Repo\ChangeOp;

/**
 * Collect distinct languages of changed parts in {@link ChangeOpResult} tree
 * @license GPL-2.0-or-later
 */
class ChangedLanguagesCollector {

    use ChangeOpResultTraversal;

    /**
     * @param ChangeOpResult $changeOpResult
     * @return string[]
     */
    public function collectChangedLanguages( ChangeOpResult $changeOpResult ): array {
        $languagesAsKeys = [];
        $traversable = $this->makeRecursiveTraversable( $changeOpResult );

        foreach ( $traversable as $result ) {
            if ( $result instanceof LanguageBoundChangeOpResult && $result->isEntityChanged() ) {
                $languagesAsKeys[$result->getLanguageCode()] = 1;
            }
        }

        return array_keys( $languagesAsKeys );
    }
}