/// <summary>
/// 实例化方法
/// </summary>
/// <param name="sign">运算符</param>
/// <returns>返回运算法则</returns>
public static Operation CreateOperation(string sign)
{
Operation opera = null;
switch (sign)
{
case "+":
opera = new AddOperation();
break;
case "-":
opera = new SubOperation();
break;
case "*":
opera = new MulOperation();
break;
case "/":
opera = new DivOperation();
break;
default:
throw new System.Exception("暂未添加此功能！");
}
return(opera);
}
public static GenericOperation CreateOperation(string oprator)
{
GenericOperation operation = null;
switch (oprator)
{
case "+":
operation = new AddOperation();
break;
case "-":
operation = new SubOperation();
break;
case "*":
operation = new MulOperation();
break;
case "/":
operation = new DivOperation();
break;
default:
throw new System.ArgumentException(string.Format("{0} operation is not defined.", oprator));
// break;
}
return(operation);
}
public static Operation CreateOperation(string strOp)
{
Operation op;
switch (strOp)
{
case "+":
op = new AddOperation();
break;
case "-":
op = new SubOperation();
break;
case "*":
op = new MulOperation();
break;
case "/":
op = new DivOperation();
break;
case "%":
op = new ModuloOperation();
break;
default:
return(null);
}
return(op);
}
public SimpleTerm(NonTerminal factor, MulOperation mulOperation)
{
Factor = factor;
MulOperation = mulOperation;
}
