main.cpp

#include <iostream>
#include <fstream>
#include <string>
#include <stack>
#include "Machine.h"
#include "FileIO.h"
using namespace std;

int main() {
  string alphabet; // sigma - character alphabet
  int numStates = 0; // number of states;
  string finalStates; // F - finals states

  // Get input file
  string fileName; // Input file name
  FileIO fileInput; // Input file object
  cout << "Please specify input file name: ";
  getline(cin, fileName);
  while(!fileInput.setFile(fileName)) {
    cout << "File open failed." << endl << "Please specify another file name: ";
    getline(cin, fileName);
  }

  // Get alphabet
  alphabet = fileInput.getLine();
  // Get number of states
  numStates = fileInput.getNumber();
  // Get final states
  finalStates = fileInput.getLine();

  // Make state objects
  State** states = new State*[numStates];
  for(int i = 0; i < numStates; i++) {
    bool isFinal = false;
    for(unsigned int j = 0; j < finalStates.length(); j++) {
      if(finalStates[j] == static_cast<char>(i + 48)) isFinal = true;
    }
    states[i] = new State(alphabet.length(), isFinal);
  }

  // Get transitions
  for(int i = 0; i < numStates; i++) {
    states[i]->addTransition(fileInput.getTransition());
  }
  // Machine constructor
  Machine* machine = new Machine(states, numStates);

  // Close file
  fileInput.closeFile();
  cout << "File read successfully." << endl;

  // Main loop
  string input;
  int runType; // Step by step or fast run
  bool invalid; // Invalid input marker
  cout << "Type an input or -q to quit." << endl << "Input (! for lambda): ";
  getline(cin, input);
  while(input != "-q") {
    // Check for invalid characters if not equal to lambda
    if(input.length() == 1 && input[0] == '!') {
      machine->doLambda();
    } else {
      invalid = false; // Innocent until proven guilty
      for(unsigned int i = 0; i < input.length() && !invalid; i++) {
        bool found = false;
        for(unsigned int j = 0; j < alphabet.length(); j++) {
          if(input[i] == alphabet[j]) found = true;
        }
        if(!found) {
          cout << "Invalid input." << endl;
          invalid = true;
        }
      }
      // If character is invalid, start over
      if(invalid) {
        cout << "Type an input or -q to quit." << endl << "Input (! for lambda): ";
        getline(cin, input);
        continue;
      }
      // Get run type - step by step or fast run
      runType = 0;
      while(runType < 1 || runType > 2) {
        cout << "(1) Step By Step" << endl << "(2) Fast Run" << endl << "Choice: ";
        cin >> runType;
        cin.ignore(256, '\n');
      }
      if(runType == 1) {
        machine->doStep(alphabet, input);
      } else {
        machine->doAll(alphabet, input);
      }
    }
    cout << "Type an input or -q to quit." << endl << "Input (! for lambda): ";
    getline(cin, input);
  }
  // End
  delete machine;
  return 0;
}