commandLab/calculator.cpp at master · tshen005/commandLab · GitHub

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//
//  main.cpp
//  commandLab
//
//  Created by shen on 16/11/7.
//  Copyright © 2016年 shen. All rights reserved.
//

#include <iostream>
#include <vector>
#include "composite.h"
#include "menu.h"
#include "command.h"
#include <stdlib.h>
#include <cstring>
using namespace std;

bool isInteger(const string& s)
{
    if(s.empty()) {
        return false ;
    }

    char * p ;
    strtol(s.c_str(), &p, 10) ;

    return (*p == 0) ;
}

int main() {

    Menu* menu = new Menu();
    string input;

    while(input != "exit") {

        cout << "Choose a Menu Command: ";
        getline(cin, input);
        //cout << isInteger(input.substr(2)) << endl;
        //cout << input.substr(0,1) << "======" << endl;
        //string a =input.substr(0,1);
        if(input == "exit") {
            break;
        }
        else if(input == "redo") {
            cout << "Redoing Command" << endl;
            menu->redo();
            cout << "Result: ";
            menu->execute();
        }
        else if(input == "undo") {
            cout << "Undoing Command" << endl;
            menu->undo();
            cout << "Result: ";
            menu->execute();
        }
        else if(isInteger(input)) {
            if(!menu->initialized()) {
                menu->add_command(new OpCommand(atoi(input.c_str())));
                cout << "Result: ";
                menu->execute();
            }
        }
        //
        else if(input.substr(0,1) == "+") {
            if(menu->initialized()) {
                if(isInteger(input.substr(2))) {
                    menu->add_command(new AddCommand(menu->get_command(), atoi((input.substr(2)).c_str())));
                    cout << "Result: ";
                    menu->execute();
                }
            }
        }
        else if(input.substr(0,1) == "-") {
            if(menu->initialized()) {
                if(isInteger(input.substr(2))) {
                    menu->add_command(new SubCommand(menu->get_command(), atoi((input.substr(2)).c_str())));
                    cout << "Result: ";
                    menu->execute();
                }
            }
        }
        else if(input.substr(0,1) == "*") {
            if(menu->initialized()) {
                if(isInteger(input.substr(2))) {
                    menu->add_command(new MultCommand(menu->get_command(), atoi((input.substr(2)).c_str())));
                    cout << "Result: ";
                    menu->execute();
                }
            }
        }
        else if(input == "^") {
            if(menu->initialized()) {
                menu->add_command(new SqrCommand(menu->get_command()));
                cout << "Result: ";
                menu->execute();
            }
        }
        else {
            cout << "Invalid Command" << endl;
        }

    }
};