decodeBallFileJson function

Implementation

BallFile decodeBallFileJson(Object? json) {
  if (json is! Map) {
    throw BallFileFormatException('ball file JSON must be an object');
  }
  final type = json['@type'];
  if (type is! String) {
    throw BallFileFormatException(
      'ball file JSON is not self-describing: missing "@type" '
      '(expected a google.protobuf.Any envelope)',
    );
  }
  final body = Map<String, dynamic>.from(json)..remove('@type');
  if (_isProgramUrl(type)) {
    return BallProgramFile(
      Program()..mergeFromProto3Json(body, ignoreUnknownFields: true),
    );
  }
  if (_isModuleUrl(type)) {
    return BallModuleFile(
      Module()..mergeFromProto3Json(body, ignoreUnknownFields: true),
    );
  }
  throw BallFileFormatException('unknown ball file @type: "$type"');
}