public static AtomicTableau GetAtomicTableau(this Formula formula, TruthLabel truthLabel)
{
switch (formula)
{
case ConjuctionFormula conjunction:
return(new ConjunctionTableau(conjunction, truthLabel));
case DisjunctionFormula disjunction:
return(new DisjunctionTableau(disjunction, truthLabel));
case EquivalenceFormula equivalence:
return(new EquivalenceTableau(equivalence, truthLabel));
case ImplicationFormula implication:
return(new ImplicationTableau(implication, truthLabel));
case NegationFormula negation:
return(new NegationTableau(negation, truthLabel));
case VariableFormula variable:
return(new VariableTableau(variable, truthLabel));
}
throw new ArgumentException();
}
public static string GetStringRepresentation(this TruthLabel truthLabel)
{
if (truthLabel == TruthLabel.True)
{
return("T");
}
if (truthLabel == TruthLabel.False)
{
return("F");
}
else
{
throw new InvalidOperationException();
}
}
internal ConjunctionTableau(ConjuctionFormula formula, TruthLabel truthLabel)
{
Formula = Conjunction = formula;
TruthLabel = truthLabel;
}
internal EquivalenceTableau(EquivalenceFormula formula, TruthLabel truthLabel)
{
Formula = Equivalence = formula;
TruthLabel = truthLabel;
}
internal Literal(char symbol, TruthLabel truthLabel)
{
Symbol = symbol;
TruthLabel = truthLabel;
}
public NegationTableau(NegationFormula formula, TruthLabel truthLabel)
{
Formula = Negation = formula;
TruthLabel = truthLabel;
}
protected override void HandleFalseCase(Branch branch)
{
branch.AddNewFormula(new BranchItem(Negation.Subformula, TruthLabel.GetOpposite()));
ComputeRepresentingNode(branch);
}
internal VariableTableau(VariableFormula formula, TruthLabel truthLabel)
{
Formula = Variable = formula;
TruthLabel = truthLabel;
}
public static string ToString(this TruthLabel truthLabel)
{
return((truthLabel == TruthLabel.True) ? "True" : "False");
}
public static int GetBinaryValue(this TruthLabel label)
{
return((label == TruthLabel.True) ? 1 : 0);
}
public static TruthLabel GetOpposite(this TruthLabel label)
{
var oppositeValue = TruthLabel.True == label ? TruthLabel.False : TruthLabel.True;
return(oppositeValue);
}
internal BranchItem(Formula formula, TruthLabel truthLabel)
{
Formula = formula;
TruthLabel = truthLabel;
}
internal BranchItem(TableauInputNode tableauInputNode)
{
Formula = tableauInputNode.Formula;
TruthLabel = tableauInputNode.TruthLabel;
}
internal DisjunctionTableau(DisjunctionFormula formula, TruthLabel truthLabel)
{
Formula = Disjunction = formula;
TruthLabel = truthLabel;
}
internal ImplicationTableau(ImplicationFormula formula, TruthLabel truthLabel)
{
Formula = Implication = formula;
TruthLabel = truthLabel;
}