/// <summary>
/// Call a predicate that takes no arguments
/// </summary>
/// <param name="predicateName">predicate name only.</param>
/// <returns>success or failure</returns>
public bool Call(string predicateName)
{
AMProgram program = (AMProgram)_program;
AMInstructionSet iset = new AMInstructionSet();
if (!program.IsDefined(predicateName + "/0"))
{
return(false);
}
// Add the call instruction
program.P = new ProgramNode(iset.CreateInstruction("call", predicateName, "0"));
program.AddProgramNode(program.P);
// Add the halt insturction
program.AddInstruction(iset.CreateInstruction("halt"));
// Execute the program
Transition();
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);
}