@prezly/theme-kit-core/build/intl/getLanguageDisplayName.mjs

Data layer and utility library for developing Prezly themes with JavaScript

import { Locale } from '@prezly/theme-kit-intl';

/**
 * @returns the display name of the locale in its native language
 *
 * If there's only one culture used in a specific language,
 * we strip the culture name completely.
 *
 * Examples:
 *  - English (Global), Spanish (Spain)
 *  - -> English, Spanish
 *  - English (Global), English (UK), Spanish (Spain)
 *  - -> English (Global), English (UK), Spanish
 */

export function getLanguageDisplayName(subject, context) {
  var locale = toLocale(subject);
  var locales = context.map(toLocale);
  var candidates = locales.filter(candidate => Locale.isSameLang(candidate.code, locale.code));
  if (candidates.length === 1) {
    return locale.native_name.replace(/\s*\(.*\)/, '');
  }
  return locale.native_name;
}
function toLocale(value) {
  if ('native_name' in value && 'code' in value) {
    return value;
  }
  return value.locale;
}