listEach function

IValidator listEach(
  1. IValidator itemValidator
)

Returns a Validator that runs itemValidator for each item in the list

This validator also checks that the value is a list

Implementation

IValidator listEach(IValidator itemValidator) {
  return $isList &
      Validator((value) {
        final errors = <Expectation>[];
        FutureOr<Result> loop(int index) {
          if (index >= value.length) {
            return errors.isEmpty
                ? Result.valid(value)
                : Result.invalid(value, expectations: errors);
          }
          final item = value[index];

          if (item == null && itemValidator.isNullable) {
            return loop(index + 1);
          }
          final res = itemValidator.validator(item);
          if (res is Future<Result>) {
            return res.then((r) {
              _collectListIndex(r, errors, index);
              return loop(index + 1);
            });
          }
          _collectListIndex(res, errors, index);
          return loop(index + 1);
        }

        return loop(0);
      });
}