public object Evaluate()
{
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.TaxFunction += TaxFunction;
visitor.TaxWithPointFunction += TaxWithPointFunction;
visitor.AnnualBonusTaxFunction += AnnualBonusTaxFunction;
visitor.ForeignTaxFunction += ForeignTaxFunction;
visitor.IsSalaryEndDateMonthEquelFunction += IsSalaryEndDateMonthEquelFunction;
visitor.DoubleSalaryFunction += DoubleSalaryFunction;
visitor.AnnualBonusForeignTaxFunction += AnnualBonusForeignTaxFunction;
visitor.EvaluateFunction += EvaluateFunction;
visitor.EvaluateParameter += EvaluateParameter;
visitor.Parameters = parameters;
//LogicalExpression.Create(Parse(expression)).Accept(visitor);
//modify by wsl
CommonTree ct = Parse(expression);
//将表达式转化成LogicalExpression对象
LogicalExpression le = LogicalExpression.Create(ct);
//计算表达式
le.Accept(visitor);
return(visitor.Result);
}
public void LogicalExpressionShouldHandlePrecedence()
{
BinaryExpresssion expression = LogicalExpression.Create(Parse("3 * (5 + 2)")) as BinaryExpresssion;
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(21, visitor.Result);
Assert.AreEqual(40, new Expression("5 * 2 ^ 3").Evaluate());
}
public object Evaluate()
{
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.EvaluateFunction += EvaluateFunction;
visitor.EvaluateParameter += EvaluateParameter;
visitor.Parameters = parameters;
LogicalExpression.Create(Parse(expression)).Accept(visitor);
return(visitor.Result);
}
public void LogicalExpressionShouldCreateTimes()
{
BinaryExpresssion expression = LogicalExpression.Create(Parse("3 * 2")) as BinaryExpresssion;
Assert.IsNotNull(expression);
Assert.AreEqual(BinaryExpressionType.Times, expression.Type);
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(6, visitor.Result);
}
public void LogicalExpressionShouldCreateNot()
{
UnaryExpression expression = LogicalExpression.Create(Parse("not true")) as UnaryExpression;
Assert.IsNotNull(expression);
Assert.AreEqual(typeof(Value), expression.Expression.GetType());
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(false, visitor.Result);
}
public void LogicalExpressionShouldCreateInteger()
{
Value expression = LogicalExpression.Create(Parse("2")) as Value;
Assert.IsNotNull(expression);
Assert.AreEqual("2", expression.Text);
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(2, visitor.Result);
}