load method

@override Future<GettextLocalizations> load(Locale locale)

Start loading the resources for locale. The returned future completes when the resources have finished loading.

It's assumed that this method will return an object that contains a collection of related string resources (typically defined with one method per resource). The object will be retrieved with Localizations.of.

Implementation

@override
Future<GettextLocalizations> load(Locale locale) async {
  ByteData? data;

  // Only try the regional `<lang>_<country>.po` asset when a country code
  // is actually present, otherwise the path becomes `<lang>_null.po`.
  final countryCode = locale.countryCode;
  if (countryCode != null && countryCode.isNotEmpty) {
    data = await _tryLoad(
      'assets/i18n/${locale.languageCode}_$countryCode.po',
    );
  }

  data ??= await _tryLoad('assets/i18n/${locale.languageCode}.po');
  data ??= await _tryLoad('assets/i18n/$defaultLanguage.po');

  // If no PO file was found, use default strings.
  if (data == null) {
    return GettextLocalizations.fromPO(
      'msgid ""\nmsgstr ""\n"Language: $defaultLanguage\\n"\n',
      onWarning: onWarning,
    );
  }

  return GettextLocalizations.fromBytes(
    data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes),
    onWarning: onWarning,
  );
}