RegExps

#include "stdafx.h"
#include <deque>
#include <iostream>

class Connection
{
private:
    char symb;
    int startState;
    int finState;
public:
    Connection()
    {
        symb = NULL;
        startState = -1;
        finState = -1;
    };
    Connection(char s, int start, int fin)
    {
        symb = s;
        startState = start;
        finState = fin;
    }
    Connection(char s)
    {
        symb = s;
        startState = -1;
        finState = -1;
    }
    void setStState(int st)
    {
        startState = st;
    }
    void setFinState(int st)
    {
        finState = st;
    }
    void getInfo()
    {
        std::cout << startState << "---" << symb << "-->" << finState << std::endl;
    }
    int getFinState()
    {
        return finState;
    }
    int getStartState()
    {
        return startState;
    }
};

void patchDot(Connection obj1, Connection& obj2)
{
    obj2.setStState(obj1.getFinState());
    obj2.setFinState(obj1.getFinState() + 1);
}

void patchStick(Connection obj1, Connection& obj2)
{
    obj2.setStState(obj1.getStartState());
    obj2.setFinState(obj1.getFinState());
}

void Star(Connection& obj)
{
    obj.setFinState(obj.getStartState());
}

int main()
{
    char *txt = new char[255];
    int counter = 0;
    int i = 0;

    while (std::cin >> txt[i])
        i++;
    txt[i] = '\0';
    std::cout << std::endl;
    if (txt[0] == '\0')
    {
        std::cout << "String is empty" << std::endl;
        return 0;
    }

    std::deque<Connection> FSM;
    i = 0;
    while (txt[i] != '\0')
    {
        switch (txt[i])
        {
        default:
        {
            Connection *obj = new Connection(txt[i], counter, counter + 1);
            counter++;
            FSM.push_back(*obj);
            delete obj;
            i++;
            break;
        }
        case '.':
        {
            i++;
            Connection *obj2 = new Connection(txt[i]);
            patchDot(FSM[counter - 1], *obj2);
            counter++;
            FSM.push_back(*obj2);
            delete obj2;
            i++;
            break;
        }
        case '|':
        {
            i++;
            Connection *obj = new Connection(txt[i]);
            patchStick(FSM[counter - 1], *obj);
            counter++;
            FSM.push_back(*obj); delete obj;
            i++;
            break;
        }
        case '?':
        {
            Connection *obj = new Connection(' ');
            patchStick(FSM[counter - 1], *obj);
            counter++;
            FSM.push_back(*obj); delete obj;
            i++;
            break;
        }
        case '*':
        {
            Connection *obj = new Connection(' ');
            patchStick(FSM[counter - 1], *obj);
            Star(FSM[counter - 1]);
            FSM.push_back(*obj);
            delete obj; i++; counter++;
            break;
        }
        case '+':
        {
            Connection *obj = new Connection(' ');
            Star(FSM[counter - 1]);
            patchDot(FSM[counter - 1], *obj);
            FSM.push_back(*obj);
            delete obj; i++; counter++;
            break;
        }
        }
    }



    for (int i = 0; i < FSM.size(); i++)
    {
        FSM[i].getInfo();
    }

    return 0;
}