public override ToyExpression Reduce(ToyContext context)
{
var reduced1 = _operand1.Reduce(context);
var reduced2 = _operand2.Reduce(context);
var number1 = reduced1 as ToyNumberValue;
var number2 = reduced2 as ToyNumberValue;
if (number1 != null && number2 != null)
{
switch (_operator)
{
case ToyOperatorType.Add:
return(new ToyNumberValue(number1.Value + number2.Value));
case ToyOperatorType.Sub:
return(new ToyNumberValue(number1.Value - number2.Value));
case ToyOperatorType.Mul:
return(new ToyNumberValue(number1.Value * number2.Value));
case ToyOperatorType.Div:
return(new ToyNumberValue(number1.Value / number2.Value));
default:
throw new ArgumentOutOfRangeException();
}
}
return(new ToyBinaryExpression(_operator, reduced1, reduced2));
}
public override ToyExpression Reduce(ToyContext context)
{
var reduced = _expression.Reduce(context);
var number = reduced as ToyNumberValue;
if (number != null)
{
return(new ToyNumberValue(-number.Value));
}
return(new ToyNegateExpression(reduced));
}