verifiedLocale function

String? verifiedLocale(String? newLocale, bool localeExists(String), String? onFailure(String)?)

Implementation

String? verifiedLocale(String? newLocale, bool Function(String) localeExists,
    String? Function(String)? onFailure) {
// TODO(alanknight): Previously we kept a single verified locale on the Intl
// object, but with different verification for different uses, that's more
// difficult. As a result, we call this more often. Consider keeping
// verified locales for each purpose if it turns out to be a performance
// issue.
  if (newLocale == null) {
    return verifiedLocale(
        global_state.getCurrentLocale(), localeExists, onFailure);
  }
  if (localeExists(newLocale)) {
    return newLocale;
  }
  for (var each in [
    helpers.canonicalizedLocale(newLocale),
    helpers.shortLocale(newLocale),
    'fallback'
  ]) {
    if (localeExists(each)) {
      return each;
    }
  }
  return (onFailure ?? _throwLocaleError)(newLocale);
}