AjErl.Expressions.CallExpression.Evaluate C# (CSharp) Method

        public object Evaluate(Context context, bool withvars = false)
        {
            object namevalue = this.nameexpression.Evaluate(context, withvars);

            IList<object> arguments = new List<object>();

            foreach (var argexpr in this.argumentexpressions)
                arguments.Add(Machine.ExpandDelayedCall(argexpr.Evaluate(context, withvars)));

            if (namevalue is Atom)
                namevalue = context.GetValue(string.Format("{0}/{1}", ((Atom)namevalue).Name, this.argumentexpressions.Count));

            IFunction func = (IFunction)namevalue;

            return func.Apply(context, arguments);
        }

        public void EvaluateCallExpression()
        {
            Context context = new Context();
            Function function = new Function(context, new object[] { new Variable("X"), new Variable("Y") }, new AddExpression(new VariableExpression(new Variable("X")), new VariableExpression(new Variable("Y"))));
            context.SetValue("add/2", function);
            CallExpression expr = new CallExpression(new AtomExpression(new Atom("add")), new IExpression[] { new ConstantExpression(1), new ConstantExpression(2) });

            Assert.IsFalse(expr.HasVariable());
            Assert.IsNotNull(expr.NameExpression);
            Assert.IsInstanceOfType(expr.NameExpression, typeof(AtomExpression));
            Assert.IsNotNull(expr.ArgumentExpressions);
            Assert.AreEqual(2, expr.ArgumentExpressions.Count);

            Assert.AreEqual(3, expr.Evaluate(context));
        }