genericCall function

dynamic genericCall(TypeInfo info, Function fn, dynamic value)

Implementation

dynamic genericCall(TypeInfo info, Function fn, dynamic value) {
  var params = [...info.params];

  dynamic call(dynamic Function<T>() next) {
    var t = params.removeAt(0);
    if (_mappers[t.type] != null) {
      return genericCall(t, _mappers[t.type]!.typeFactory ?? (f) => f(), next);
    } else {
      throw MapperException('Cannot find generic wrapper for type $t.');
    }
  }

  if (params.isEmpty) {
    return fn(value);
  } else if (params.length == 1) {
    return call(<A>() => fn<A>(value));
  } else if (params.length == 2) {
    return call(<A>() => call(<B>() => fn<A, B>(value)));
  } else if (params.length == 3) {
    return call(<A>() => call(<B>() => call(<C>() => fn<A, B, C>(value))));
  } else {
    throw MapperException('Cannot construct generic wrapper for type $info. Mapper only supports generic classes with up to 3 type arguments.');
  }
}