public override bool Unify(AbstractTerm term)
{
if (term.IsReference)
{
term.Assign(this);
return(true);
}
if (term.IsStructure)
{
if (term.Name != _name || term.Arity != _arity)
{
return(false);
}
for (int i = 0; i < _arity; i++)
{
if (!this[i].Unify(term[i]))
{
return(false);
}
}
return(true);
}
return(false);
}
public void UnsaveRegisters(AbstractMachineState state, int count)
{
for (int i = 0; i < count; i++)
{
AbstractTerm Xi = (AbstractTerm)state["X" + i.ToString()];
Xi.Assign((AbstractTerm)_savedVariables[i]);
}
}
private bool CreateObject(string classType, AbstractTerm netObject, AbstractMachineState state)
{
Assembly asm = GetRequiredAssembly(classType, state);
Type[] types = asm.GetTypes();
Type type = null;
type = asm.GetType(fullTypeName);
if (type == null)
{
return false;
}
netObject.Assign(new ObjectTerm(Activator.CreateInstance(type)));
return true;
}
public override bool Unify(AbstractTerm term)
{
if (term.IsReference)
{
term.Assign(this);
return(true);
}
if (term.IsList)
{
return(Head.Unify(term.Head) && Tail.Unify(term.Tail));
}
return(false);
}
public override bool Unify(AbstractTerm term)
{
if (term.IsReference)
{
term.Assign(this);
return(true);
}
if (term.IsConstant)
{
bool res = term.Data().Equals(this.Data());
return(res);
}
return(false);
}
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>
/// Binds this object to another one.
/// </summary>
/// <param name="term"></param>
public virtual void Bind(AbstractTerm term)
{
AbstractTerm t1 = this;
AbstractTerm t2 = term;
AMTrail trail = AMTrail.Instance;
// if t1 is a reference
// and
// (t2 is not a reference) or address2 < address1
if (t1.IsReference && !t2.IsReference)
{
Assign(t2);
trail.Trail(t1);
}
else
{
t2.Assign(t1);
trail.Trail(t2);
}
}
public override bool Unify(AbstractTerm term)
{
if (term.IsReference)
{
term.Assign(this);
return true;
}
if (term.IsStructure)
{
if (term.Name != _name || term.Arity != _arity)
{
return false;
}
for (int i = 0; i < _arity; i++)
{
if (!this[i].Unify(term[i]))
{
return false;
}
}
return true;
}
return false;
}
public void Unify_after_assignment()
{
AbstractTerm term = new AbstractTerm();
ConstantTerm con = new ConstantTerm("test");
term.Assign(con);
Assert.AreEqual(term.Unify(con), con.Unify(term));
}
public void Unbind()
{
AbstractTerm term = new AbstractTerm();
ConstantTerm con = new ConstantTerm("ali");
term.Assign(con);
term.Unbind();
Assert.AreNotSame(term.Reference(), con.Reference());
}
public override bool Unify(AbstractTerm term)
{
if (term.IsReference)
{
term.Assign(this);
return true;
}
if (term.IsConstant)
{
bool res = term.Data().Equals(this.Data());
return res;
}
return false;
}
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 bool Call(string predicateName, int arity, object[] args)
{
AMProgram program = (AMProgram)_program;
AMHeap heap = (AMHeap)_dataArea;
AMInstructionSet iset = new AMInstructionSet();
if (!program.IsDefined(predicateName + "/" + arity))
{
return(false);
}
ArrayList a = new ArrayList();
ProgramNode entryPoint = null;
for (int i = 0; i < args.Length; i++)
{
switch (args[i].GetType().ToString())
{
case "System.String":
case "System.Int32":
case "System.Boolean":
if (entryPoint == null)
{
entryPoint = new ProgramNode(iset.CreateInstruction("put_constant", args[i].ToString(), "X" + i.ToString()));
program.AddProgramNode(entryPoint);
}
else
{
program.AddInstruction(iset.CreateInstruction("put_constant", args[i].ToString(), "X" + i.ToString()));
}
break;
case "Axiom.Runtime.AbstractTerm":
a.Add(i);
if (entryPoint == null)
{
entryPoint = new ProgramNode(iset.CreateInstruction("put_variable", "X" + args[i].ToString(), "X" + i.ToString()));
program.AddProgramNode(entryPoint);
}
else
{
program.AddInstruction(iset.CreateInstruction("put_variable", "X" + args[i].ToString(), "X" + args[i].ToString()));
}
break;
}
}
// Add the call instruction
program.AddInstruction(iset.CreateInstruction("call", predicateName, arity.ToString()));
// Add the halt insturction
program.AddInstruction(iset.CreateInstruction("halt"));
program.P = entryPoint;
// Execute the program
Transition();
foreach (int argumentNumber in a)
{
AbstractTerm var = (AbstractTerm)args[argumentNumber];
var.Assign((AbstractTerm)this["X" + argumentNumber.ToString()]);
}
return(!_fail);
}
public override bool Unify(AbstractTerm term)
{
if (term.IsReference)
{
term.Assign(this);
return true;
}
if (term.IsList)
{
return Head.Unify(term.Head) && Tail.Unify(term.Tail);
}
return false;
}
private bool InvokeMethod(AbstractTerm obj, AbstractTerm method, AbstractTerm returnObject, AbstractMachineState state)
{
if (obj.IsConstant)
{
// invoke a static method
Assembly asm = GetRequiredAssembly(obj.Data() as string, state);
Type type = asm.GetType(obj.Data() as string);
if (type == null)
{
return false;
}
ArrayList paramArray = new ArrayList();
GetTypes(type.GetMethod(method.Data() as string), method, ref paramArray, obj);
object[] arguments = paramArray.ToArray();
object res = type.InvokeMember(method.Data() as string, BindingFlags.Static | BindingFlags.Public | BindingFlags.InvokeMethod, null, null, arguments);
switch (res.GetType().ToString())
{
case "System.Char":
case "System.String":
case "System.Int32":
case "System.Boolean":
returnObject.Assign(new ConstantTerm(res.ToString()));
break;
default:
returnObject.Assign(new ObjectTerm(res));
break;
}
SetTypes(method, arguments);
}
else
{
// invoke an instance method
ArrayList paramArray = new ArrayList();
GetTypes(obj.Data().GetType().GetMethod(method.Data() as string), method, ref paramArray, obj);
object classObject = obj.Data();
MethodInfo omi = classObject.GetType().GetMethod(method.Data() as string);
object[] arguments = paramArray.ToArray();
object res = obj.Data().GetType().InvokeMember(method.Data() as string, BindingFlags.Default | BindingFlags.ExactBinding | BindingFlags.InvokeMethod, null, obj.Data(), arguments);
if (res != null)
{
switch (res.GetType().ToString())
{
case "System.String":
ConstantTerm rC = new ConstantTerm(res.ToString());
if (!returnObject.Unify(rC))
{
return false;
}
break;
case "System.Char":
case "System.Int32":
case "System.Boolean":
ConstantTerm returnConstant = new ConstantTerm(res.ToString());
if (!returnObject.Unify(returnConstant))
{
return false;
}
break;
default:
returnObject.Assign(new ObjectTerm(res));
break;
}
}
SetTypes(method, arguments);
}
return true;
}
