private void Store(ISentence aSentence)
{
originalSentences.Add(aSentence);
// Convert the sentence to CNF
CNF cnfOfOrig = cnfConverter.ConvertToCNF(aSentence);
foreach (Clause c in cnfOfOrig.GetConjunctionOfClauses())
{
c.SetProofStep(new ProofStepClauseClausifySentence(c, aSentence));
if (c.IsEmpty())
{
// This should not happen, if so the user
// is trying to add an unsatisfiable sentence
// to the KB.
throw new InvalidOperationException(
"Attempted to add unsatisfiable sentence to KB, orig=["
+ aSentence + "] CNF=" + cnfOfOrig);
}
// Ensure all clauses added to the KB are Standardized Apart.
var standardizedC = standardizeApart.GetStandardizeApartResult(c, variableIndexical);
// Will make all clauses immutable
// so that they cannot be modified externally.
standardizedC.Immutable = true;
if (clauses.Add(standardizedC))
{
// If added keep track of special types of
// clauses, as useful for query purposes
if (standardizedC.IsDefiniteClause())
{
allDefiniteClauses.Add(standardizedC);
}
if (standardizedC.IsImplicationDefiniteClause())
{
implicationDefiniteClauses.Add(standardizedC);
}
if (standardizedC.IsUnitClause())
{
this.IndexFact(standardizedC.GetLiterals().First());
}
}
}
}
public ISet <Clause> ConvertToClauses(ISentence aSentence)
{
CNF cnf = cnfConverter.ConvertToCNF(aSentence);
return(new HashedSet <Clause>(cnf.GetConjunctionOfClauses()));
}