Dependency? _fromJson()

in lib/src/dependency.dart [43:96]
47 lines of code
13 McCabe index (conditional complexity)

Dependency? _fromJson(Object? data, String name) {
  if (data is String || data == null) {
    return _$HostedDependencyFromJson({'version': data});
  }

  if (data is Map) {
    final matchedKeys =
        data.keys.cast<String>().where((key) => key != 'version').toList();

    if (data.isEmpty || (matchedKeys.isEmpty && data.containsKey('version'))) {
      return _$HostedDependencyFromJson(data);
    } else {
      final firstUnrecognizedKey =
          matchedKeys.firstWhereOrNull((k) => !_sourceKeys.contains(k));

      return $checkedNew<Dependency>('Dependency', data, () {
        if (firstUnrecognizedKey != null) {
          throw UnrecognizedKeysException(
            [firstUnrecognizedKey],
            data,
            _sourceKeys,
          );
        }
        if (matchedKeys.length > 1) {
          throw CheckedFromJsonException(
            data,
            matchedKeys[1],
            'Dependency',
            'A dependency may only have one source.',
          );
        }

        final key = matchedKeys.single;

        switch (key) {
          case 'git':
            return GitDependency.fromData(data[key]);
          case 'path':
            return PathDependency.fromData(data[key]);
          case 'sdk':
            return _$SdkDependencyFromJson(data);
          case 'hosted':
            final hosted = _$HostedDependencyFromJson(data);
            hosted.hosted?._nameOfPackage = name;
            return hosted;
        }
        throw StateError('There is a bug in pubspec_parse.');
      });
    }
  }

  // Not a String or a Map – return null so parent logic can throw proper error
  return null;
}