public static void Main(string[] args)
{
var compiler = new InstructionParser() {
setColorAction = arg => Console.WriteLine("Setting Color to {0}", arg),
setThicknessAction = arg => Console.WriteLine("Setting Thickness to {0}", arg),
setStrokeAction = arg => { if (arg!=0) { Console.WriteLine("Stroke ON"); } else { Console.WriteLine("Stroke OFF"); } },
moveAction = arg => Console.WriteLine("Moving {0} Units", arg),
turnAction = arg => Console.WriteLine("Turning {0} Degrees", arg),
};
var program = compiler.Parse(@"
X = (10+32)
repeat 2 times
set color to blue
set thickness to 10
start stroke
move forward X
turn left
move backward 5
stop stroke
end
if 0
move forward 100
else
move backward 100
end
");
var interpreter = new Interpreter(program);
while(interpreter.ExecuteNextInstruction()) {}
}
public override int Compute(Interpreter interp)
{
switch(mOp) {
case BinaryOperation.Add: return mLeft.Compute(interp) + mRight.Compute(interp);
case BinaryOperation.Subtract: return mLeft.Compute(interp) - mRight.Compute(interp);
case BinaryOperation.Multiply: return mLeft.Compute(interp) * mRight.Compute(interp);
case BinaryOperation.Divide:
int r = mRight.Compute(interp);
if (r == 0) {
Console.WriteLine("Divide By Zero");
return 0;
} else {
return mLeft.Compute(interp) / r;
}
case BinaryOperation.And: return (mLeft.Compute(interp) != 0) && (mRight.Compute(interp) != 0) ? 1 : 0;
case BinaryOperation.Or: return (mLeft.Compute(interp) != 0) || (mRight.Compute(interp) != 0) ? 1 : 0;
case BinaryOperation.Equals: return mLeft.Compute(interp) == mRight.Compute(interp) ? 1 : 0;
case BinaryOperation.GreaterThan: return mLeft.Compute(interp) > mRight.Compute(interp) ? 1 : 0;
case BinaryOperation.LessThan: return mLeft.Compute(interp) < mRight.Compute(interp) ? 1 : 0;
case BinaryOperation.GreaterThanOrEqualTo: return mLeft.Compute(interp) >= mRight.Compute(interp) ? 1 : 0;
case BinaryOperation.LessThanOrEqualTo: return mLeft.Compute(interp) <= mRight.Compute(interp) ? 1 : 0;
default: return 0;
}
}
public override int Compute(Interpreter interp)
{
int result;
if (!interp.GetVariable(name, out result)) {
Console.WriteLine("Undefined Variable Expression");
}
return result;
}
public override int Compute(Interpreter interp)
{
switch(mOp) {
case UnaryOperation.Negate: return -mExpr.Compute(interp);
case UnaryOperation.Complement: return mExpr.Compute(interp) != 0 ? 0 : 1;
default: return 0;
}
}
public override int Compute(Interpreter interp)
{
return 0;
}
public abstract int Compute(Interpreter interp);
public abstract void Execute(Interpreter interp);
public override void Execute(Interpreter interp)
{
interp.Goto(condition.Compute(interp) == 0 ? indexFalse : indexTrue);
}
public override void Execute(Interpreter interp)
{
mAction(mExpr.Compute(interp));
}
public override void Execute(Interpreter interp)
{
interp.ClearVariable(name);
}
public override void Execute(Interpreter interp)
{
interp.SetVariable(mName, mExpr.Compute(interp));
}
public override void Execute(Interpreter interp)
{
interp.Goto(index);
}
