public ICCOutput IntCodeComputer()
{
//InitMemory();
int jumpIndex = 0;
inputCallBacks = 0;
ICCOutput iccMainOutput = new ICCOutput();
while (jumpIndex <= opCodeSequence.Length)
{
ICCOutput temp = new ICCOutput();
temp = ProcessOptCode(ref opCodeSequence, ref jumpIndex);
//iccMainOutput.opCodeDetected = temp.opCodeDetected;
if (temp.opCodeDetected == OpCodes.output)
{
iccMainOutput.outputFromPhase = temp.outputFromPhase;
//break;
}
else if (temp.opCodeDetected == OpCodes.halt || temp.opCodeDetected == OpCodes.unexpectedHalt)
{
Debug.WriteLine(temp.outputFromPhase);
iccMainOutput.opCodeDetected = OpCodes.halt;
break;
}
}
return(iccMainOutput);
}
public ICCOutput ProcessOptCode(ref int[] opCodeSeq, ref int instructionStart)
{
try
{
ICCOutput outputStruct = new ICCOutput();
//new route is ABCDE
//before we do the operation. We must work out what mode we are in.
int pos1, pos2, pos3;
int sequenceSize = opCodeSeq.Length - 1;
pos3 = (instructionStart + 3) <= sequenceSize ? opCodeSeq[instructionStart + 3] : 0;
pos2 = instructionStart + 2 <= sequenceSize ? opCodeSeq[instructionStart + 2] : 0;
pos1 = instructionStart + 1 <= sequenceSize ? opCodeSeq[instructionStart + 1] : 0;
var opCodeAndParamModeList = ProcessInstruction(opCodeSeq[instructionStart]);
int val1, val2, val3;
switch (opCodeAndParamModeList.Item1)
{
case OpCodes.add:
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
val2 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
val3 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[2], opCodeSeq, pos3);
//moves by 4 params.
//Work out what the mode is, then perform the operation.
opCodeSeq[pos3] = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1) + RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
instructionStart += 4;
outputStruct.opCodeDetected = OpCodes.add;
break;
case OpCodes.times:
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
val2 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
val3 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[2], opCodeSeq, pos3);
//moves by 4 params
opCodeSeq[pos3] = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1) * RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
instructionStart += 4;
outputStruct.opCodeDetected = OpCodes.times;
break;
case OpCodes.input:
if (manualInputs.Count > 0)
{
opCodeSeq[pos1] = manualInputs.Dequeue();
instructionStart += 2;
}
break;
case OpCodes.output:
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
instructionStart += 2;
outputStruct.opCodeDetected = OpCodes.output;
outputStruct.outputFromPhase = val1;
break;
case OpCodes.jumpIfTrue:
//Opcode 5 is jump-if-true: if the first parameter is non-zero,
//it sets the instruction pointer to the value from the second parameter. Otherwise, it does nothing.
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
if (Math.Abs(val1) > 0)
{
val2 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
instructionStart = val2;
}
else
{
instructionStart += 3;
}
outputStruct.opCodeDetected = OpCodes.jumpIfTrue;
break;
case OpCodes.jumpIfFalse:
//Opcode 6 is jump-if-false: if the first parameter is zero,
//it sets the instruction pointer to the value from the second parameter. Otherwise, it does nothing.
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
if (val1 == 0)
{
val2 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
instructionStart = val2;
}
else
{
instructionStart += 3;
}
outputStruct.opCodeDetected = OpCodes.jumpIfFalse;
break;
case OpCodes.isLessThan:
//Opcode 7 is less than: if the first parameter is less than the second parameter,
//it stores 1 in the position given by the third parameter. Otherwise, it stores 0.
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
val2 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
val3 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[2], opCodeSeq, pos3);
opCodeSeq[pos3] = val1 < val2 ? 1 : 0;
instructionStart += 4;
outputStruct.opCodeDetected = OpCodes.isLessThan;
break;
case OpCodes.isEquals:
//Opcode 8 is equals: if the first parameter is equal to the second parameter,
//it stores 1 in the position given by the third parameter. Otherwise, it stores 0.
val1 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[0], opCodeSeq, pos1);
val2 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[1], opCodeSeq, pos2);
val3 = RetrieveValueBasedOnMode(opCodeAndParamModeList.Item2[2], opCodeSeq, pos3);
opCodeSeq[pos3] = val1 == val2 ? 1 : 0;
instructionStart += 4;
outputStruct.opCodeDetected = OpCodes.isEquals;
break;
case OpCodes.halt:
outputStruct.opCodeDetected = OpCodes.halt;
break;
}
return(outputStruct);
}
catch (Exception exc)
{
Debug.WriteLine(exc.Message);
ICCOutput oc = new ICCOutput();
oc.opCodeDetected = OpCodes.unexpectedHalt;
return(oc);
}
}
