public IntepreterInstruction(InterpreterInstructionType type, int value, int sourceIndex)
: this()
{
this.Type = type;
this.Value = value;
this.SourceIndex = sourceIndex;
this.SourceLength = 1;
}
private static void HandlePointerAndValues(List <IntepreterInstruction> instructions, ref int pointerPosition, bool knownPosition, int i, char c, InterpreterInstructionType lastType, ref IntepreterInstruction nextInsn)
{
var movePointer = c == '<' || c == '>';
var changeValue = c == '+' || c == '-';
if (movePointer || changeValue)
{
var step = c == '-' || c == '<' ? -1 : +1;
if (movePointer)
{
pointerPosition += step;
}
if ((movePointer && (lastType == InterpreterInstructionType.SetPointer || lastType == InterpreterInstructionType.MovePointer)) ||
(changeValue && (lastType == InterpreterInstructionType.SetValue || lastType == InterpreterInstructionType.AddValue)))
{
nextInsn = instructions.Pop();
nextInsn.Value += step;
nextInsn.SourceLength++;
}
else if (movePointer)
{
if (knownPosition)
{
nextInsn = new IntepreterInstruction(InterpreterInstructionType.SetPointer, pointerPosition, i);
}
else
{
nextInsn = new IntepreterInstruction(InterpreterInstructionType.MovePointer, pointerPosition, i);
}
}
else
{
// if (changeValue)
nextInsn = new IntepreterInstruction(InterpreterInstructionType.AddValue, step, i);
}
}
}
private static void HandleBeginLoop(string source, ref bool knownPosition, ref int i, InterpreterInstructionType lastType, ref IntepreterInstruction nextInsn)
{
// skip loop, after loop
if (lastType == InterpreterInstructionType.EndLoop)
{
i = ScannLoop(source, i, true);
}
else
{
// check if pointer movements in loops are balanced, so we can know the absolute position of the pointer
if (knownPosition && !BalancedPointerInLoop(source, i))
{
knownPosition = false;
}
nextInsn = new IntepreterInstruction(InterpreterInstructionType.BeginLoop, 0, i);
}
}
