/// <summary> /// Dereferences this object to the object it is assigned to. /// </summary> /// <returns></returns> public virtual AbstractTerm Dereference() { // in case we are wrapping a variable if (IsAssigned()) { return(_containee.Dereference()); } return(this); //if (_containee == null || _containee == this) //{ // return this; //} //else //{ // AbstractTerm reference = _containee; // while (reference._containee != null) // { // _reference = _reference._containee; // } // return _reference; //} //return null; }
public void Assign() { AbstractTerm term = new AbstractTerm(); ConstantTerm con = new ConstantTerm("ali"); term.Assign(con); Assert.AreSame(term.Dereference(), con); Assert.AreSame(term.Dereference(), con.Dereference()); Assert.AreEqual(term.Data(), con.Data()); Assert.AreSame(term.Reference(), con.Reference()); Assert.IsFalse(term.IsList); Assert.IsFalse(term.IsObject); Assert.IsFalse(term.IsReference); Assert.IsFalse(term.IsStructure); Assert.IsTrue(term.IsConstant); }
/// <summary> /// Assigns this object to another one. /// </summary> /// <param name="term"></param> public void Assign(AbstractTerm term) { //if (term._containee == this) //{ // return; //} //_containee = term; _containee = term.Dereference(); }
public void Dereference() { AbstractTerm term1 = new AbstractTerm(); AbstractTerm term2 = new AbstractTerm(); AbstractTerm term3 = new AbstractTerm(); term2.Bind(term3); term1.Bind(term2); Assert.AreSame(term3, term1.Dereference()); }
public void Unify_ref_ref() { AbstractTerm term = new AbstractTerm(); AbstractTerm another = new AbstractTerm(); bool result = term.Unify(another); Assert.AreSame(term.Dereference(), another); Assert.IsTrue(result); }
public bool Call(string predicatename, int arity, object[] args, bool more) { AMProgram program = (AMProgram)_program; AMHeap heap = (AMHeap)_dataArea; AMInstructionSet iset = new AMInstructionSet(); // argument indexes ArrayList argumentIndexes = new ArrayList(); if (!more) { _passedVariables = new ArrayList(); } for (int i = 0; i < args.Length; i++) { if (args[i] != null) { switch (args[i].GetType().ToString()) { case "System.String": case "System.Int32": case "System.Boolean": if (!more) { AbstractTerm var = new ConstantTerm(args[i].ToString()); heap.Push(var); _passedVariables.Add(-1); AbstractTerm Xn = (AbstractTerm)this["X" + i]; Xn.Assign(var); } break; case "Axiom.Runtime.AbstractTerm": if (!more) { AbstractTerm heapVariable = new AbstractTerm(); heap.Push(heapVariable); _passedVariables.Add(heapVariable); AbstractTerm Xn = (AbstractTerm)this["X" + i]; Xn.Assign(heapVariable); } break; } } } if (!more) { program.P = new ProgramNode(iset.CreateInstruction("call", predicatename, arity.ToString())); program.AddProgramNode(program.P); program.AddInstruction(iset.CreateInstruction("halt")); } // Execute the program Transition(); for (int i = 0; i < _passedVariables.Count; i++) { if (!(_passedVariables[i] is int)) { AbstractTerm v = (AbstractTerm)_passedVariables[i]; AbstractTerm argumentVariable = (AbstractTerm)args[i]; argumentVariable.Assign(v.Dereference()); } } return(!_fail); }
public static double Evaluate(AbstractTerm t) { double result = 0; AbstractTerm term = t.Dereference(); if (term.IsConstant) { int r; double d; if (Int32.TryParse((string)term.Data(), out r)) { return r; } else if (Double.TryParse((string)term.Data(), out d)) { return d; } else { switch ((string)term.Data()) { case "pi": result = Math.PI; break; case "e": result = Math.E; break; case "cputime": Process p = Process.GetCurrentProcess(); result = (p.TotalProcessorTime.TotalMilliseconds/1000); break; default: throw new Exception("TermEvaluator: cannot evaluate string " + term.Data()); } } } else if (term.IsReference) { throw new Exception("TermEvaluator: cannot evaluate a reference term."); } else if (term.IsStructure) { AbstractTerm op1 = (AbstractTerm)term.Next; AbstractTerm op2 = (AbstractTerm)term.Next.Next; switch (term.Name) { case "+": result = Evaluate(op1) + Evaluate(op2); break; case "-": result = Evaluate(op1) - Evaluate(op2); break; case "*": result = Evaluate(op1) * Evaluate(op2); break; case "/": if (Evaluate(op2) == 0) { throw new Exception("TermEvaluator: Division by zero error."); } result = Evaluate(op1) / Evaluate(op2); break; case "^": result = Math.Pow(Evaluate(op1), Evaluate(op2)); break; case "cos": result = Math.Cos(Evaluate(op1)); break; case "sin": result = Math.Sin(Evaluate(op1)); break; case "tan": result = Math.Tan(Evaluate(op1)); break; case "log": result = Math.Log(Evaluate(op1)); break; } } return result; }
/// <summary> /// Assigns this object to another one. /// </summary> /// <param name="term"></param> public void Assign(AbstractTerm term) { //if (term._containee == this) //{ // return; //} //_containee = term; _containee = term.Dereference(); }