public static InstructionNode UncodifyInstructionFormat(
int number,
Var var)
{
if (number < 0)
{
throw new InvalidOperationException();
}
InstructionNode fakeInstruction;
if (number == 0)
{
fakeInstruction = new UnaryExpressionInstructionNode(
var.ToString(),
-1);
}
else if (number == 1 || number == 2)
{
fakeInstruction = new BinaryExpressionInstructionNode(
var.ToString(),
number == 1 ? "+" : "-");
}
else
{
var codifiedLabel = number - 2;
var label = UncodifyLabel(codifiedLabel);
fakeInstruction = new ConditionalInstructionNode(
var.ToString(),
label.ToString(),
-1);
}
return(fakeInstruction);
}
public void Instruction()
{
var instruction = new BinaryExpressionInstructionNode("X", "+")
{
Label = new Label("A")
};
AssertEqualCodified(instruction, 21);
}
private static void StepBinaryExpression(BinaryExpressionInstructionNode binaryExpression)
{
var targetVar = GetTargetVar(binaryExpression.Var.Type);
var index = GetNormalizedIndex(binaryExpression);
switch (binaryExpression.Operator)
{
case BinaryExpressionInstructionNode.OperatorEnum.Increment:
targetVar[index] += 1;
break;
case BinaryExpressionInstructionNode.OperatorEnum.Decrement:
if (targetVar[index] > 0)
{
targetVar[index] -= 1;
}
break;
default:
throw new InvalidOperationException();
}
}
public void DecrementBinaryExpressionInstructionFormat()
{
var instruction = new BinaryExpressionInstructionNode("X", "-");
AssertEqualCodifiedFormat(instruction, 2);
}
