public override bool DropInt(Circumstance C, Literal goal, Unifier un)
{
Unifier bak = un.Clone();
bool isCurrentInt = false;
IEnumerator <Intention> iint = C.GetAllIntentions();
while (iint.Current != null)
{
Intention i = iint.Current;
IPlanBody pb = i.Peek().GetPlan().GetBody();
while (pb != null)
{
if (pb.GetBodyType() == BodyType.Body_Type.achieve || pb.GetBodyType() == BodyType.Body_Type.achieveNF)
{
if (un.Unifies(pb.GetBodyTerm(), goal))
{
C.DropIntention(i);
isCurrentInt = isCurrentInt || i.Equals(C.GetSelectedIntention());
un = bak.Clone();
break;
}
}
pb = pb.GetBodyNext();
}
}
return(isCurrentInt);
}
public ITerm RemoveCurrentStep()
{
if (IsFinished())
{
return(null);
}
else
{
ITerm r = planBody.GetBodyTerm();
planBody = planBody.GetBodyNext();
return(r);
}
}
public override ITerm GetTerm(int i)
{
switch (i)
{
case 0:
return((label == null) ? noLabelAtom : label);
case 1:
return(tevent);
case 2:
return((context == null) ? Literal.LTrue : context);
case 3:
if (body.GetBodyNext() == null && body.GetBodyTerm().IsVar())
{
return(body.GetBodyTerm());
}
return(body);
default:
return(null);
}
}
public bool UnifyTerms(ITerm term, ITerm term2)
{
if (term.IsArithExpr())
{
term = term.CApply(this);
}
if (term2.IsArithExpr())
{
term2 = term2.CApply(this);
}
bool termIsVar = term.IsVar();
bool term2IsVar = term2.IsVar();
// One of them is a variable
if (termIsVar || term2IsVar)
{
VarTerm termv = termIsVar ? (VarTerm)term : null;
VarTerm term2v = term2IsVar ? (VarTerm)term2 : null;
// Get their values
ITerm termvl = termIsVar ? Get(termv) : term;
ITerm term2vl = term2IsVar ? Get(term2v) : term2;
if (termvl != null && term2vl != null) // Unify the values of the two variables
{
return(UnifiesNoUndo(termvl, term2vl));
}
else if (termvl != null) // Unify a variable with a value
{
return(Bind(term2v, termvl));
}
else if (term2vl != null)
{
return(Bind(termv, term2vl));
}
else // Unify two variables
{
if (!UnifyTerms(termv.GetNS(), term2v.GetNS()))
{
return(false);
}
if (termv.Negated() != term2v.Negated())
{
return(false);
}
Bind(termv, term2v);
return(true);
}
}
// Both terms are not vars
// If any of the terms is not a literal (is a number or string), they must be equal
// For unification, lists are literals
if (!term.IsLiteral() && !term.IsList() || !term2.IsLiteral() && !term2.IsList())
{
return(term.Equals(term2));
}
// Case of plan body
if (term.IsPlanBody() && term2.IsPlanBody())
{
IPlanBody pb1 = (IPlanBody)term;
IPlanBody pb2 = (IPlanBody)term2;
if (pb1.GetBodyTerm() == null && pb2.GetBodyTerm() == null)
{
return(true);
}
if (pb1.GetBodyTerm() == null && pb2.GetBodyTerm() != null)
{
return(false);
}
if (pb1.GetBodyTerm() != null && pb2.GetBodyTerm() == null)
{
return(false);
}
if (pb1.GetBodyTerm().IsVar() && pb2.GetBodyTerm().IsVar())
{
if (UnifiesNoUndo(pb1.GetBodyTerm(), pb2.GetBodyTerm()))
{
return(UnifiesNoUndo(pb1.GetBodyNext(), pb2.GetBodyNext()));
}
else
{
return(false);
}
}
if (pb1.GetBodyTerm().IsVar())
{
if (pb1.GetBodyNext() == null)
{
return(UnifiesNoUndo(pb1.GetBodyTerm(), pb2));
}
else
{
if (pb2.GetBodyTerm() == null)
{
return(false);
}
if (UnifiesNoUndo(pb1.GetBodyTerm(), pb2.GetHead()))
{
if (pb2.GetBodyNext() == null)
{
if (pb1.GetBodyNext() != null && pb1.GetBodyNext().GetBodyTerm().IsVar() && pb1.GetBodyNext().GetBodyNext() == null)
{
return(UnifiesNoUndo(pb1.GetBodyNext().GetBodyTerm(), new PlanBodyImpl()));
}
return(false);
}
else
{
return(UnifiesNoUndo(pb1.GetBodyNext(), pb2.GetBodyNext()));
}
}
}
}
else if (pb2.GetBodyTerm().IsVar())
{
return(Unifies(pb2, pb1));
}
}
// Both terms are literal
Literal t1s = (Literal)term;
Literal t2s = (Literal)term2;
// Different arities
int ts = t1s.GetArity();
if (ts != t2s.GetArity())
{
return(false);
}
// If both are literal, they must have the same negated
if (t1s.Negated() != t2s.Negated())
{
return(false);
}
// Different functor
if (!t1s.GetFunctor().Equals(t2s.GetFunctor()))
{
return(false);
}
// Different namespace
if (!UnifiesNamespace(t1s, t2s))
{
return(false);
}
// Unify inner terms
for (int i = 0; i < ts; i++)
{
if (!UnifiesNoUndo(t1s.GetTerm(i), t2s.GetTerm(i)))
{
return(false);
}
}
// The first's annotations must be a subset of the second's annotations
if (!t1s.HasSubsetAnnot(t2s, this))
{
return(false);
}
return(true);
}
