Axiom.Runtime.Instructions.GetListInstruction.Execute C# (CSharp) Method

        public override void Execute(AbstractMachineState state)
        {
            AMProgram program = (AMProgram)state.Program;
            AMHeap heap = (AMHeap)state.DataArea;

            AbstractTerm Ai = ((AbstractTerm)state[_ai]).Dereference();

            if (Ai.IsReference)
            {
                heap.Push(new ListTerm());
                Ai.Bind((AbstractTerm)heap.Top());
                state.IsWriteMode = true;
            }
            else if (Ai.IsList)
            {
                state.S = Ai.Next;
                state.IsReadMode = true;
            }
            else
            {
                state.Fail = true;
            }

            if (state.Fail)
            {
                state.Backtrack();
            }
            else
            {
                program.Next();
            }
        }

        public void GetList()
        {
            AbstractMachineState state = SetupMachine();

            GetListInstruction i = new GetListInstruction();

            object[] args = { "X0" };

            i.Process(args);

            i.Execute(state);

            Assert.AreEqual("get_list", i.Name());
            Assert.AreEqual(1, i.NumberOfArguments());

            AbstractTerm X0 = ((AbstractTerm)state["X0"]).Dereference();

            Assert.IsTrue(X0.IsList);
        }