/**
* Distribute or (|) over and (&).
*
* @param sentence
* a propositional logic sentence. This sentence should already
* have biconditionals, and implications removed and negations
* moved inwards.
* @return an equivalent Sentence to the input with or's distributed over
* and's.
*/
public static Sentence distribute(Sentence sentence)
{
Sentence result = null;
DistributeOrOverAnd distributeOrOverAnd = new DistributeOrOverAnd();
result = sentence.accept(distributeOrOverAnd, null);
return(result);
}
/**
* Returns the specified sentence in its logically equivalent conjunctive
* normal form.
*
* @param s
* a propositional logic sentence
*
* @return the input sentence converted to it logically equivalent
* conjunctive normal form.
*/
public static Sentence convert(Sentence s)
{
Sentence result = null;
Sentence nnfSentence = ConvertToNNF.convert(s);
Sentence cnfSentence = DistributeOrOverAnd.distribute(nnfSentence);
result = cnfSentence;
return(result);
}