private static void VisitOr(Disjunction or, GdlVisitor visitor)
{
visitor.VisitOr(or);
var expressions = or.GetDisjuncts().ToList();
for (int i = 0; i < expressions.Count(); i++)
VisitAll(expressions[i], visitor);
}
private static Substitution Mgu(Disjunction dis1, Disjunction dis2)
{
List<Expression> contents1 = dis1.GetDisjuncts().ToList();
List<Expression> contents2 = dis2.GetDisjuncts().ToList();
if (contents1.Count != contents2.Count)
return null;
var subs = new Substitution();
return contents1.Where((t, i) => Mgu(t, contents2[i], subs) == false).Any() ? null : subs;
}
private Disjunction RenameOr(Disjunction or, Dictionary<TermVariable, TermVariable> renamings)
{
return or.VariablesOrEmpty.Any()
? new Disjunction(or.Constituents.Select(t => RenameLiteral(t, renamings)).ToArray())
: or;
}
private static Disjunction SubstituteOr(Disjunction or, Substitution theta)
{
return or.VariablesOrEmpty.Any()
? new Disjunction(or.Constituents.Select(t => SubstituteLiteral(t, theta)).ToArray())
: or;
}
private void AskOr(Disjunction or, LinkedList<Expression> goals, KnowledgeBase context, Substitution theta,
ProverCache cache, VariableRenamer renamer, bool askOne, HashSet<Substitution> results, HashSet<Fact> alreadyAsking)
{
foreach (Expression expression in or.Constituents)
{
goals.AddFirst(expression);
Ask(goals, context, theta, cache, renamer, askOne, results, alreadyAsking);
goals.RemoveFirst();
if (askOne && (results.Any()))
break;
}
}