public static IEnumerator <IntCodeOutput> ParseAndRunIntCode(
string intCode,
Queue <long> inputs = null,
long?noun = null,
long?verb = null,
Func <long> getInput = null)
{
long GetNextInput()
{
if (inputs.Any())
{
return(inputs.Dequeue());
}
if (getInput != null)
{
return(getInput());
}
throw new Exception("Cannot fetch new input - queue empty and no input provider present.");
}
inputs ??= new Queue <long>();
var initialState = Parser.ParseIntCode(intCode);
var state = new IntCodeState
{
State = initialState.ApplyNounAndVerb(noun, verb),
Index = 0
};
var outputs = new List <long>();
while (state.OpCode != 99)
{
switch (state.OpCode)
{
// ADD
case 1:
state = state.ApplyOperation((x, y) => x + y);
break;
// MULTIPLY
case 2:
state = state.ApplyOperation((x, y) => x * y);
break;
// INPUT
case 3:
state = state.ApplyInput(GetNextInput());
break;
// OUTPUT
case 4:
state = state.ApplyOutput(x => { outputs.Add(x); });
yield return(new IntCodeOutput
{
Output = outputs.Last(), IsComplete = false, CurrentState = state.State
});
break;
// JUMP IF TRUE
case 5:
state = state.JumpIf(x => x != 0);
break;
// JUMP IF FALSE
case 6:
state = state.JumpIf(x => x == 0);
break;
// LESS THAN
case 7:
state = state.Compare((x, y) => x < y);
break;
// EQUALS
case 8:
state = state.Compare((x, y) => x == y);
break;
// EQUALS
case 9:
state = state.AdjustRelativeBase();
break;
default:
throw new Exception($"Unrecognised instruction: {state.Value}");
}
}
yield return(new IntCodeOutput {
IsComplete = true, CurrentState = state.State
});
}
