Base lab1

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <regex>
#include <streambuf>
#include <iomanip>
#include <Windows.h>

int matrix[4][4] =
{ //S, A1, A2, A3
    1, 1,  2,  3, //A for 0-9
    3, 2,  3,  3, //A for ".,"
    3, 4,  4,  0, //S/F for fail or end
    3, 3,  3,  3  //F - fail state for everything else
};
// 3 - fail state
// 1 - state for digits
// 2 - state for dot in number
// 4 - print state

/*
 * Most important function in auto-rifle. Add states or new conditions in it for new functionality
 * This one is for searching fractional numbers
 */
int row(char& a)
{
    if (a >= '0' && a <= '9')
    {
        return 0;
    }
    if (a == '.' || a == ',')
    {
        return 1;
    }
    if (a == ' ' || a == '\n')
    {
        return 2;
    }
    return 3;
}


/*
 Auto-rifle
 Usage: auto_rifle(string_you_want_to_check, vec_you_want_to_pt_results);
 */
void auto_rifle(std::string& str, std::vector<double>& vec)
{
    std::string num = "";
    int state = 0;
    for (unsigned long long k = 0; k < str.size(); k++)
    {
        if (state == 0)
            num.clear();
        state = matrix[(row(str[k]))][state];
        num.push_back(str[k]);
        if (state == 4 || ((state == 1 || state == 2) && k == str.size() - 1))
        {
            vec.push_back(std::stod(num));
            state = 0;
        }
    }
    return;
}

using namespace std;

HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE); //Console address to change text color

/*
 Printing color messages in console
 Usage: print_str(sring_you_want_to_print, color_of_text, time_between_letters);
 Colors: https://i.stack.imgur.com/ZG625.png
*/
inline bool print_str(string str, int k, int n)
{
    SetConsoleTextAttribute(hConsole, k);
    for (int l = 0; l < int(str.size()); l++)
    {
        cout << str[l];
        Sleep(n);
    }
    SetConsoleTextAttribute(hConsole, 14);
    return true;
}

/*
 * Read function, reads from given path/.../file
 * Usage: read(vec_you_want_to_fill, file)
 * Returns 1 if couldn't open file, can be used in cycles like "do{} while()" or common
 * Returns 0 if everything is okay (maybe)
 */
int read(vector<double>& vec, string& file_path)
{
    string file;
    ifstream in;
    in.open(file_path);
    if (!in.is_open())
    {
        print_str("Couldn't read the file, type again: ", 4, 10);
        return 1;
    }
    ofstream on("out.txt");
    file.assign((istreambuf_iterator<char>(in)),
        istreambuf_iterator<char>());
    in.close();
    auto_rifle(file, vec);
    return 0;
}

//Calcs some stuff for lab
double calc(double& a, double& b)
{
    if (a < b)
    {
        print_str("a < b\n", 11, 10);
        print_str("(b^3 - 2) / a = ", 10, 10);
        return (b*b*b - 2) / a;
    }
    else if (a == b)
    {
        print_str("a == b\n", 11, 10);
        print_str("Answer = ", 10, 10);
        return -3;
    }
    else
    {
        print_str("a > b\n", 11, 10);
        print_str("(3 * a - 5) / b = ", 10, 10);
        return (3 * a - 5) / b;
    }
}

int main()
{
    string file, output, dummy;
    ofstream out;
    vector<double> Nums;
    double a, b, result;
    print_str("Write file name: ", 11, 10);
    do
    {
        getline(cin, file);
    } while (read(Nums, file));
    print_str("Write output file: ", 11, 10);
    getline(cin, output);
    out.open(output);
    for (unsigned int i = 1; i < Nums.size(); i = i + 2)
    {
        a = Nums[i-1];
        b = Nums[i];
        print_str("a = ", 15, 10);
        cout << a << " ";
        print_str("b = ", 15, 10);
        cout << b << endl;
        out << "a = " << a << " b = " << b << endl;
        result = calc(a, b);
        cout << setprecision(10) << result << endl << endl;
        out << "Result = " << setprecision(10) << result << endl << endl;
    }
    out.close();
    print_str("Press Enter to exit.", 15, 10);
    getline(cin, dummy);
    return 0;
}