public Object newMinus(int line, int column, Object left, Object right) {
MinusNode node = new MinusNode();
node.setLeft((Node) left);
node.setRight((Node) right);
setPosition(node, line, column);
return node;
}
@Override
public Object visit(MinusNode node) {
StringBuilder sb = new StringBuilder();
sb.append(visit(node.GetLeftChild()));
sb.append(" - ");
sb.append(visit(node.GetRightChild()));
return sb.toString();
}