private static HashSet<Term> ToSampleTerms(TermModel termModel)
{
var results = new HashSet<Term>();
if (termModel.PossibleConstants.Any())
results.Add(termModel.PossibleConstants.First());
foreach (NameAndArity nameAndArity in termModel.PossibleFunctions.Keys)
{
List<TermModel> bodyModel = termModel.PossibleFunctions[nameAndArity];
IEnumerable<HashSet<Term>> functionSampleTerms = ToSampleTerms(bodyModel);
var functionBodies = functionSampleTerms.CartesianProduct();
foreach (IEnumerable<Term> functionBody in functionBodies)
results.Add(new TermFunction(nameAndArity.Name, functionBody.ToArray()));
}
return results;
}
public bool MergeIn(TermModel other)
{
bool changesMade = !PossibleConstants.IsSupersetOf(other.PossibleConstants);
PossibleConstants.UnionWith(other.PossibleConstants);
foreach (NameAndArity key in other.PossibleFunctions.Keys)
{
List<TermModel> theirFunctionBodies = other.PossibleFunctions[key];
if (PossibleFunctions.ContainsKey(key))
{
List<TermModel> ourFunctionBodies = PossibleFunctions[key];
if (ourFunctionBodies.Count != theirFunctionBodies.Count)
throw new Exception();
for (int i = 0; i < ourFunctionBodies.Count; i++)
changesMade |= ourFunctionBodies[i].MergeIn(theirFunctionBodies[i]);
}
else
{
PossibleFunctions[key] = DeepCopyOf(theirFunctionBodies);
changesMade = true;
}
}
return changesMade;
}
private static TermModel CopyOf(TermModel originalTermModel)
{
var termModel = new TermModel();
termModel.MergeIn(originalTermModel);
return termModel;
}
private Dictionary<TermVariable, TermModel> GetVarsToModelsMap(Implication rule)
{
var varsToUse = new HashSet<TermVariable>(rule.Consequent.VariablesOrEmpty);
var varsToModelsMap = new Dictionary<TermVariable, TermModel>();
foreach (TermVariable var in varsToUse)
varsToModelsMap[var] = new TermModel();
foreach (Expression literal in rule.Antecedents.Conjuncts)
{
var fact = literal as Fact;
if (fact != null)
{
List<Term> literalBody = fact.GetTerms();
var nameAndArity = new NameAndArity(fact);
SentencesModel.CreateIfRequired(nameAndArity);
List<TermModel> literalModel = SentencesModel[nameAndArity];
AddVariablesToMap(literalBody, literalModel, varsToModelsMap);
}
}
return varsToModelsMap;
}
