Map? _environmentMap()

in lib/src/pubspec.dart [176:212]

• 32 lines of code
• 5 McCabe index (conditional complexity)

Map<String, VersionConstraint?>? _environmentMap(Map? source) =>
    source?.map((k, value) {
      final key = k as String;
      if (key == 'dart') {
        // github.com/dart-lang/pub/blob/d84173eeb03c3/lib/src/pubspec.dart#L342
        // 'dart' is not allowed as a key!
        throw CheckedFromJsonException(
          source,
          'dart',
          'VersionConstraint',
          'Use "sdk" to for Dart SDK constraints.',
          badKey: true,
        );
      }

      VersionConstraint? constraint;
      if (value == null) {
        constraint = null;
      } else if (value is String) {
        try {
          constraint = VersionConstraint.parse(value);
        } on FormatException catch (e) {
          throw CheckedFromJsonException(source, key, 'Pubspec', e.message);
        }

        return MapEntry(key, constraint);
      } else {
        throw CheckedFromJsonException(
          source,
          key,
          'VersionConstraint',
          '`$value` is not a String.',
        );
      }

      return MapEntry(key, constraint);
    });