@Override
public Sequence[] expand(Sequence sigma) {
if (!isEvaluated()) {
throw new LogicalException("Can't expand not evaluated implication!");
}
if (value == LogicalValue.TRUE) {
Sequence firstBranch = new Sequence(sigma);
Formula newLeft = left.clone();
newLeft.setValue(LogicalValue.FALSE);
firstBranch.addFront(newLeft);
Sequence secondBranch = new Sequence(sigma);
Formula newRight = right.clone();
newRight.setValue(LogicalValue.TRUE);
secondBranch.addFront(newRight);
return new Sequence[] {firstBranch, secondBranch};
} else {
Sequence resultSequence = new Sequence(sigma);
Formula newRight = right.clone();
newRight.setValue(LogicalValue.FALSE);
resultSequence.addFront(newRight);
Formula newLeft = left.clone();
newLeft.setValue(LogicalValue.TRUE);
resultSequence.addFront(newLeft);
return new Sequence[] {resultSequence};
}
}
public void run() {
Tokenizer tokenizer = new Tokenizer(input);
tokenizer.run();
InfixToPostfixConverter converter = new InfixToPostfixConverter(tokenizer.getLexemes());
converter.run();
FormulaGenerator generator = new FormulaGenerator(converter.getRPN());
generator.run();
formula = generator.getFormula();
formula.setValue(LogicalValue.FALSE);
}