canonicalizedLocale function

String canonicalizedLocale(
  1. String? aLocale
)

Implementation

String canonicalizedLocale(String? aLocale) {
// Locales of length < 5 are presumably two-letter forms, or else malformed.
// We return them unmodified and if correct they will be found.
// Locales longer than 6 might be malformed, but also do occur. Do as
// little as possible to them, but make the '-' be an '_' if it's there.
// We treat C as a special case, and assume it wants en_ISO for formatting.
// TODO(alanknight): en_ISO is probably not quite right for the C/Posix
// locale for formatting. Consider adding C to the formats database.
  if (aLocale == null) return global_state.getCurrentLocale();
  if (aLocale == 'C') return 'en_ISO';
  if (aLocale.length < 5) return aLocale;
  if (aLocale[2] != '-' && (aLocale[2] != '_')) return aLocale;
  var region = aLocale.substring(3);
// If it's longer than three it's something odd, so don't touch it.
  if (region.length <= 3) region = region.toUpperCase();
  return '${aLocale[0]}${aLocale[1]}_$region';
}