Function msg

third_party/subscriptions-project/swg.js:8647–8681

* Gets a message for a given language code, from a map of messages. * @param {!Object } map * @param {?string|?Element} languageCodeOrElement * @return {?string}

(map, languageCodeOrElement)

 * @return {?string}
 */
function msg(map, languageCodeOrElement) {
  const defaultMsg = map[DEFAULT_LANGUAGE_CODE];

  // Verify params.
  if (typeof map !== 'object' || !languageCodeOrElement) {
    return defaultMsg;
  }

  // Get language code.
  let languageCode =
    typeof languageCodeOrElement === 'string'
      ? languageCodeOrElement
      : getLanguageCodeFromElement(languageCodeOrElement);

  // Normalize language code.
  languageCode = languageCode.toLowerCase();
  languageCode = languageCode.replace(/_/g, '-');

  // Search for a message matching the language code.
  // If a message can't be found, try again with a less specific language code.
  const languageCodeSegments = languageCode.split('-');
  while (languageCodeSegments.length) {
    const key = languageCodeSegments.join('-');
    if (key in map) {
      return map[key];
    }

    // Simplify language code.
    // Ex: "en-US-SF" => "en-US"
    languageCodeSegments.pop();
  }

  // There was an attempt.
  return defaultMsg;
}

/**
 * Gets a language code (ex: "en-US") from a given Element.