Inheritance: BinaryExpression
 public void SubtractTwoIntegers()
 {
     SubtractExpression expr = new SubtractExpression(new ConstantExpression(2), new ConstantExpression(1));
     Assert.IsNotNull(expr.LeftExpression);
     Assert.IsNotNull(expr.RightExpression);
     Assert.AreEqual(1, expr.Evaluate(null));
 }
Beispiel #2
0
        private IExpression ParseBinaryExpression(int level)
        {
            if (level >= binaryoperators.Length)
                return this.ParseTerm();

            IExpression expr = this.ParseBinaryExpression(level + 1);

            if (expr == null)
                return null;

            Token token;

            for (token = this.lexer.NextToken(); token != null && this.IsBinaryOperator(level, token); token = this.lexer.NextToken())
            {
                if (token.Value == "=:=")
                    expr = new StrictEqualExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "==")
                    expr = new EqualExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "+")
                    expr = new AddExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "-")
                    expr = new SubtractExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "*")
                    expr = new MultiplyExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "/")
                    expr = new DivideExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "div")
                    expr = new DivExpression(expr, this.ParseBinaryExpression(level + 1));
                else if (token.Value == "rem")
                    expr = new RemExpression(expr, this.ParseBinaryExpression(level + 1));
            }

            if (token != null)
                this.lexer.PushToken(token);

            return expr;
        }
        public void SubtractIntegerFromDouble()
        {
            SubtractExpression expr = new SubtractExpression(new ConstantExpression(2.5), new ConstantExpression(1));

            Assert.AreEqual(2.5 - 1, expr.Evaluate(null));
        }
        public void SubtractTwoDoubles()
        {
            SubtractExpression expr = new SubtractExpression(new ConstantExpression(2.5), new ConstantExpression(3.7));

            Assert.AreEqual(2.5 - 3.7, expr.Evaluate(null));
        }
        public void SubtractDoubleFromInteger()
        {
            SubtractExpression expr = new SubtractExpression(new ConstantExpression(1), new ConstantExpression(2.5));

            Assert.AreEqual(1 - 2.5, expr.Evaluate(null));
        }