Axiom.Runtime.Builtins.Meta.AtomPredicate.Execute C# (CSharp) Method

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

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

            if (X0.IsReference || X0.IsList || X0.IsStructure)
            {
                state.Backtrack();
                return;
            }

            else if (X0.IsConstant)
            {
                string constantData = (string)X0.Data();

                double v;
                int u;

                if (Int32.TryParse(constantData, out u) || double.TryParse(constantData, out v))
                {
                    state.Backtrack();
                    return;
                }
            }

            program.Next();
        }