Exemple #1
0
        private void CreateConnective(char connective)
        {
            Proposition result = null;

            // 'GetCorrespondingConnective'
            switch (connective)
            {
            case Negation.SYMBOL:
                result = new Negation();
                break;

            case Implication.SYMBOL:
                result = new Implication();
                break;

            case BiImplication.SYMBOL:
                result = new BiImplication();
                break;

            case Conjunction.SYMBOL:
                result = new Conjunction();
                break;

            case Disjunction.SYMBOL:
                result = new Disjunction();
                break;

            case Nand.SYMBOL:
                result = new Nand();
                break;

            case UniversalQuantifier.SYMBOL:
                result = new UniversalQuantifier(PopBoundVariable());
                break;

            case ExistentialQuantifier.SYMBOL:
                result = new ExistentialQuantifier(PopBoundVariable());
                break;
            }

            // 'CreateExpression'
            // The symbols[symbols.Count - 1] can always be done. Placement is dependent on Unary or Binary connective.
            if (result is BinaryConnective)
            {
                ((BinaryConnective)result).LeftSuccessor  = symbols[symbols.Count - 2];
                ((BinaryConnective)result).RightSuccessor = symbols[symbols.Count - 1];
                symbols.RemoveAt(symbols.Count - 1);
                symbols.RemoveAt(symbols.Count - 1);
            }
            else
            {
                ((UnaryConnective)result).LeftSuccessor = symbols[symbols.Count - 1];
                symbols.RemoveAt(symbols.Count - 1);
            }

            // Now the expression is a symbol in case a nested connective needs to use it
            // as right or left successor.
            symbols.Add(result);
        }
Exemple #2
0
        public override Proposition Copy()
        {
            Quantifier quantifier = null;

            if (Data == UniversalQuantifier.SYMBOL)
            {
                quantifier = new UniversalQuantifier(boundVariable);
            }
            else
            {
                quantifier = new ExistentialQuantifier(boundVariable);
            }

            foreach (char appliedVariable in alreadyAppliedReplacementCharacters)
            {
                quantifier.AddAppliedReplacementVariable(appliedVariable);
            }

            quantifier.LeftSuccessor = LeftSuccessor.Copy();
            return(quantifier);
        }