parser.cpp

#include <bits/stdc++.h>
#include "parser.h"

using namespace std;

// Extract both model and wirings of the rotor referenced in string s. This is done by splitting a given line into a model name, and its respective wirings.
pair<string, string> getFields(string s)
{
      string model = "";
      string wiring = "";

      for (auto c : s)
      {
            // The model and the wiring for each rotor are separated by a ":".
            if (c != ':')
                  model += c;
            else
            {
                  // Removes the model name and the two following characters ": " from s. The resultant string is the wiring for the rotor referenced by model.
                  wiring = s.erase(0, model.length() + 2);

                  break;
            }
      }

      pair<string, string> pair_model_wiring = make_pair(model, wiring);

      return pair_model_wiring;
}

pair<string, string> searchRotor(int rotor_index)
{
      map<int, string> map_rotorModels =
          {
              {1, "ROTOR_I"},
              {2, "ROTOR_II"},
              {3, "ROTOR_III"}};

      //Allocate a file enabled for read-only
      ifstream f_rotor_wirings;

      //Open specified .GraphModellingLanguage file
      f_rotor_wirings.open("wirings.txt");

      if (!f_rotor_wirings)
      {
            cout << "Unable to read rotor wirings. Check if the file 'wirings.txt' exists.\n";
      }

      string line;

      pair<string, string> pair_model_wirings;

      while (getline(f_rotor_wirings, line))
      {
            pair_model_wirings = getFields(line);

            if (pair_model_wirings.first == map_rotorModels[rotor_index])
                  break;
      }

      return pair_model_wirings;
}

pair<string, string> searchReflector(int reflector_index)
{
      map<int, string> map_reflectorModels =
          {
              {1, "REFLECTOR_A"}};

      //Allocate a file enabled for read-only
      ifstream f_reflector_wirings;

      //Open specified .GraphModellingLanguage file
      f_reflector_wirings.open("reflector-wiring.txt");

      if (!f_reflector_wirings)
      {
            cout << "Unable to read reflector wirings. Check if the file 'reflector.txt' exists.\n";
      }

      string line;

      pair<string, string> pair_model_wirings;

      while (getline(f_reflector_wirings, line))
      {     
            pair_model_wirings = getFields(line);

            if (pair_model_wirings.first == map_reflectorModels[reflector_index])
                  break;
      }

      return pair_model_wirings;
}