//public bool HasNext()
//{
// if (c == null) // the first call of hasNext should find the first response
// Find();
// return c != null;
//}
//public Unifier Next()
//{
// if (c == null) Find();
// Unifier b = c;
// Find(); // find next response
// return b;
//}
void Find()
{
while (listOutter != null && listOutter.Count != 0)
{
while (list.Count != 0)
{
IListTerm candidate = AsSyntax.AsSyntax.CreateList(list);
list.Remove(list.ElementAt(list.Count - 1));
c = un.Clone();
if (c.UnifiesNoUndo(sublist, candidate))
{
return; // found another sublist, c is the current response
}
}
listOutter = listOutter.GetNext();
if (listOutter == null || listOutter.IsVar()) // the case of lists with tail
{
break;
}
list = listOutter.GetAsList();
}
if (!triedEmpty)
{
triedEmpty = true;
c = un.Clone();
if (c.UnifiesNoUndo(sublist, AsSyntax.AsSyntax.CreateList()))
{
return; // found another sublist, c is the current response
}
}
c = null; // no more sublists found
}
//public bool HasNext()
//{
// if (c == null) // the first call of hasNext should find the first response
// Find();
// return c != null;
//}
//public Unifier Next()
//{
// if (c == null)
// Find();
// Unifier b = c;
// Find(); // find next response
// return b;
//}
void Find()
{
while (list.MoveNext())
{
IListTerm l = list.Current;
if (l.IsVar()) // the case of the tail of the list
{
break;
}
c = un.Clone();
if (c.UnifiesNoUndo(sublist, AsSyntax.AsSyntax.CreateList(l)))
{
return; // found another sublist, c is the current response
}
}
c = null; // no more sublists found
}
public override bool HasSubsetAnnot(Literal p, Unifier u)
{
if (annotations == null)
{
return(true);
}
if (!p.HasAnnot())
{
return(false);
}
ITerm thisTail = null;
IListTerm pAnnots = p.GetAnnots().CloneLTShallow();
VarTerm pTail = pAnnots.GetTail();
ITerm pAnnot = null;
IListTerm pAnnotsTail = null;
IEnumerator <ITerm> en = pAnnots.ListTermIterator();
bool enReset = false;
IEnumerator <IListTerm> en2 = annotations.ListTermIterator(); // use this iterator to get the tail of the list
while (en2.MoveNext())
{
IListTerm lt = en2.Current;
ITerm annot = lt.GetTerm();
if (annot == null)
{
break;
}
if (lt.IsTail())
{
thisTail = lt.GetTail();
}
if (annotations.IsVar() && !enReset)
{
enReset = true;
en = pAnnots.ListTermIterator();
pAnnot = null;
}
bool ok = false;
while (true)
{
if (pAnnot != null && u.UnifiesNoUndo(annotations, pAnnot))
{
ok = true;
en.Dispose();
pAnnot = en.Current;
break;
}
else if (pAnnot != null && pAnnot.CompareTo(annot) > 0)
{
break;
}
else if (en.MoveNext())
{
pAnnot = en.Current;
}
else
{
break;
}
}
if (!ok && pTail != null)
{
if (pAnnotsTail == null)
{
pAnnotsTail = (IListTerm)u.Get(pTail);
if (pAnnotsTail == null)
{
pAnnotsTail = new ListTermImpl();
u.Unifies(pTail, pAnnotsTail);
pAnnotsTail = (IListTerm)u.Get(pTail);
}
}
pAnnotsTail.Add((ITerm)annot.Clone()); // Como uso el Clone de C# lo que clono son object que luego hay que castear...
ok = true;
}
if (!ok)
{
return(false);
}
}
if (thisTail != null)
{
u.Unifies(thisTail, pAnnots);
}
return(true);
}
