wikimedia/mediawiki-extensions-Wikibase

/**
 * JavaScript implementation of \Wikibase\Lib\LanguageFallbackIndicator.
 *
 * @license GPL-2.0-or-later
 */
wikibase.view.languageFallbackIndicator = ( function ( wb ) {
    'use strict';

    var SELF = {};

    /**
     * @param {Term} term The term for which a fallback is potentially shown.
     * @param {string} requestedLanguage The language code which was requested (generally the user language).
     * @return {string} HTML
     */
    SELF.getHtml = function getHtml( term, requestedLanguage ) {
        var actualLanguage = term.getLanguageCode();
        // sourceLanguage does not apply, no transliteration in JS

        var isFallback = actualLanguage !== requestedLanguage;
        // isTransliteration does not apply

        if ( !isFallback ) {
            return '';
        }

        if (
            this._getBaseLanguage( actualLanguage ) === this._getBaseLanguage( requestedLanguage )
                || actualLanguage === 'mul'
        ) {
            return '';
        }

        var text = wb.getLanguageNameByCodeForTerms( actualLanguage );

        var classes = 'wb-language-fallback-indicator';
        var attributes = { class: classes };

        var html = mw.html.element( 'sup', attributes, text );
        return '\u{00A0}' + html;
    };

    /**
     * @private
     * @param {string} languageCode
     * @return {string}
     */
    SELF._getBaseLanguage = function ( languageCode ) {
        return languageCode.replace( /-.*/, '' );
    };

    return SELF;
}( wikibase ) );