parseOn method

@override Result<Sequence3<R1, R2, R3>> parseOn(Context context)

Primitive method doing the actual parsing.

The method is overridden in concrete subclasses to implement the parser specific logic. The methods takes a parse context and returns the resulting context, which is either a Success or Failure context.

Implementation

@override
Result<Sequence3<R1, R2, R3>> parseOn(Context context) {
  final result1 = parser1.parseOn(context);
  if (result1.isFailure) return result1.failure(result1.message);
  final result2 = parser2.parseOn(result1);
  if (result2.isFailure) return result2.failure(result2.message);
  final result3 = parser3.parseOn(result2);
  if (result3.isFailure) return result3.failure(result3.message);
  return result3.success(
      Sequence3<R1, R2, R3>(result1.value, result2.value, result3.value));
}