public new Trigger Clone()
{
Trigger c = new Trigger(op, type, literal.Copy());
c.predicateIndicatorCache = predicateIndicatorCache;
c.isTerm = isTerm;
return(c);
}
//public bool HasNext()
//{
// if (needsUpdate)
// Get();
// return current != null;
//}
//public Unifier Next()
//{
// if (needsUpdate)
// Get();
// if (current != null)
// needsUpdate = true;
// return current;
//}
private void Get()
{
needsUpdate = false;
current = default;
if (arch != null && !arch.IsRunning())
{
return;
}
if (annotsOptions != null)
{
while (annotsOptions.MoveNext())
{
Literal belToTry = belInBB.Copy().SetAnnots(null).AddAnnots(annotsOptions.Current);
Unifier u = un.Clone();
if (u.UnifiesNoUndo(lit, belToTry))
{
current = u;
return;
}
}
annotsOptions = null;
}
if (ruleIt != null)
{
while (ruleIt.MoveNext())
{
Unifier ruleUn = ruleIt.Current;
Literal rHead = rule.HeadCApply(ruleUn);
UseDerefVars(rHead, ruleUn);
rHead.MakeVarsAnnon();
Unifier unC = un.Clone();
if (unC.UnifiesNoUndo(lit, rHead))
{
current = unC;
return;
}
}
ruleIt = null;
}
while (il.MoveNext())
{
belInBB = il.Current;
if (belInBB.IsRule())
{
rule = (Rule)belInBB;
if (cloneAnnon == null)
{
cloneAnnon = (Literal)lit.CApply(un);
cloneAnnon.MakeVarsAnnon();
}
Unifier ruleUn = new Unifier();
if (ruleUn.UnifiesNoUndo(cloneAnnon, rule))
{
ruleIt = rule.GetBody().LogicalConsequence(ag, ruleUn);
Get();
if (current != null)
{
return;
}
}
else
{
if (nbAnnots > 0)
{
if (belInBB.HasAnnot())
{
int nbAnnotsB = belInBB.GetAnnots().Count;
if (nbAnnotsB >= nbAnnots)
{
annotsOptions = belInBB.GetAnnots().SubSets(nbAnnots);
Get();
if (current != null)
{
return;
}
}
}
}
else
{
Unifier u = un.Clone();
if (u.UnifiesNoUndo(lit, belInBB))
{
current = u;
return;
}
}
}
}
}
}