InOtherLanguagesAid.php

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<?php
class InOtherLanguagesAid extends TranslationAid {
    public function getData() {
        $suggestions = array(
            '**' => 'suggestion',
        );

        // Fuzzy translations are not included in these
        $translations = $this->getTranslations();
        $code = $this->handle->getCode();

        $sourceLanguage = $this->handle->getGroup()->getSourceLanguage();

        foreach ( $this->getFallbacks( $code ) as $fbcode ) {
            if ( !isset( $translations[$fbcode] ) ) {
                continue;
            }

            if ( $fbcode === $sourceLanguage ) {
                continue;
            }

            $suggestions[] = array(
                'language' => $fbcode,
                'value' => $translations[$fbcode],
            );
        }

        return $suggestions;
    }

    protected function getFallbacks( $code ) {
        global $wgTranslateLanguageFallbacks;

        // User preference has the final say
        $preference = $this->context->getUser()->getOption( 'translate-editlangs' );
        if ( $preference !== 'default' ) {
            $fallbacks = array_map( 'trim', explode( ',', $preference ) );
            foreach ( $fallbacks as $k => $v ) {
                if ( $v === $code ) {
                    unset( $fallbacks[$k] );
                }
            }

            return $fallbacks;
        }

        // Global configuration settings
        $fallbacks = array();
        if ( isset( $wgTranslateLanguageFallbacks[$code] ) ) {
            $fallbacks = (array)$wgTranslateLanguageFallbacks[$code];
        }

        $list = Language::getFallbacksFor( $code );
        array_pop( $list ); // Get 'en' away from the end
        $fallbacks = array_merge( $list, $fallbacks );

        return array_unique( $fallbacks );
    }
}