public void Test2()
{
/* 提示：算术运算符的不同优先级 */
var a = Operand.Constant(1);
var b = (Operand)2;
var c = (Operand)3;
var d = (Operand)4;
var e = (Operand)5;
var expression = a + b * c - d / e;
Assert.IsType <Operand.BinaryOperand>(expression);
Assert.Equal(OperandType.Subtract, expression.Type);
var binary = (Operand.BinaryOperand)expression;
Assert.IsType <Operand.BinaryOperand>(binary.Left);
var addition = (Operand.BinaryOperand)binary.Left;
Assert.Equal(OperandType.Constant, addition.Left.Type);
Assert.Equal(1, ((Operand.ConstantOperand <int>)addition.Left).Value);
Assert.IsType <Operand.BinaryOperand>(addition.Right);
var multiply = (Operand.BinaryOperand)addition.Right;
Assert.Equal(OperandType.Multiply, multiply.Type);
Assert.Equal(OperandType.Constant, multiply.Left.Type);
Assert.Equal(OperandType.Constant, multiply.Right.Type);
Assert.Equal(2, ((Operand.ConstantOperand <int>)multiply.Left).Value);
Assert.Equal(3, ((Operand.ConstantOperand <int>)multiply.Right).Value);
Assert.IsType <Operand.BinaryOperand>(binary.Right);
var divide = (Operand.BinaryOperand)binary.Right;
Assert.Equal(OperandType.Divide, divide.Type);
Assert.Equal(OperandType.Constant, divide.Left.Type);
Assert.Equal(OperandType.Constant, divide.Right.Type);
Assert.Equal(4, ((Operand.ConstantOperand <int>)divide.Left).Value);
Assert.Equal(5, ((Operand.ConstantOperand <int>)divide.Right).Value);
}
public void Test1()
{
var a = Operand.Constant(1);
var b = (Operand)2;
var c = (Operand)3;
var d = (Operand)4;
var e = (Operand)5;
var expression = (a + b) * (c - d) / e;
Assert.IsType <Operand.BinaryOperand>(expression);
Assert.Equal(OperandType.Divide, expression.Type);
var binary = (Operand.BinaryOperand)expression;
Assert.Equal(OperandType.Constant, binary.Right.Type);
Assert.Equal(5, ((Operand.ConstantOperand <int>)binary.Right).Value);
Assert.IsType <Operand.BinaryOperand>(binary.Left);
binary = (Operand.BinaryOperand)binary.Left;
Assert.Equal(OperandType.Multiply, binary.Type);
Assert.IsType <Operand.BinaryOperand>(binary.Left);
var addition = (Operand.BinaryOperand)binary.Left;
Assert.Equal(OperandType.Add, addition.Type);
Assert.Equal(OperandType.Constant, addition.Left.Type);
Assert.Equal(OperandType.Constant, addition.Right.Type);
Assert.Equal(1, ((Operand.ConstantOperand <int>)addition.Left).Value);
Assert.Equal(2, ((Operand.ConstantOperand <int>)addition.Right).Value);
Assert.IsType <Operand.BinaryOperand>(binary.Right);
var subtraction = (Operand.BinaryOperand)binary.Right;
Assert.Equal(OperandType.Subtract, subtraction.Type);
Assert.Equal(OperandType.Constant, subtraction.Left.Type);
Assert.Equal(OperandType.Constant, subtraction.Right.Type);
Assert.Equal(3, ((Operand.ConstantOperand <int>)subtraction.Left).Value);
Assert.Equal(4, ((Operand.ConstantOperand <int>)subtraction.Right).Value);
}
