StackItemSets.fromJson constructor

StackItemSets.fromJson(
  1. Object? json_
)

Returns a new instance from a JSON value. May throw if the value does not have the expected structure.

Implementation

factory StackItemSets.fromJson(Object? json_) {
  final json = json_ is Map
      ? _spec.fields.map((f) => json_[f.label]).toList(growable: false)
      : json_;
  return switch (json) {
    [final insertions, final deletions] ||
    (final insertions, final deletions) =>
      StackItemSets(
        insertions: (insertions! as Iterable)
            .map((e) => (() {
                  final l = e is Map
                      ? List.generate(2, (i) => e[i.toString()],
                          growable: false)
                      : e;
                  return switch (l) {
                    [final v0, final v1] || (final v0, final v1) => (
                        bigIntFromJson(v0),
                        (v1! as Iterable).map(StartLength.fromJson).toList(),
                      ),
                    _ => throw Exception('Invalid JSON $e')
                  };
                })())
            .toList(),
        deletions: (deletions! as Iterable)
            .map((e) => (() {
                  final l = e is Map
                      ? List.generate(2, (i) => e[i.toString()],
                          growable: false)
                      : e;
                  return switch (l) {
                    [final v0, final v1] || (final v0, final v1) => (
                        bigIntFromJson(v0),
                        (v1! as Iterable).map(StartLength.fromJson).toList(),
                      ),
                    _ => throw Exception('Invalid JSON $e')
                  };
                })())
            .toList(),
      ),
    _ => throw Exception('Invalid JSON $json_')
  };
}