//
//  MyString.cpp
//  lab1
//
//  Created by Alex on 10/2/12.
//  Copyright (c) 2012 Alexey Oshevnev. All rights reserved.
//

#include "MyString.h"
#include <string.h>
#include <iostream>

using namespace std;

MyString::MyString() {
    str = NULL;
}


MyString::~MyString() {
    delete[] str;
}

MyString::MyString (const MyString &obj) {
    str = new char[strlen(obj.str) + 1];
    strcpy(str, obj.str);
}

void MyString :: input() {
    char *tmp = new char[1];
    cout << endl << "input: ";
    fflush(stdin);
    gets(tmp);
    str = new char[strlen(tmp) + 1];
    strcpy(str, tmp);
}

void MyString :: output() {
    cout << endl << "output: " << str <<endl;
}

MyString MyString::operator+(MyString obj) {
    MyString tmp;
    tmp.str= new char[strlen(this->str)+strlen(obj.str) + 1];
    strcpy(tmp.str,this->str);
    strcat(tmp.str,obj.str);

    return tmp;
}

void MyString::operator+=(MyString obj) {
    strcat(this->str, obj.str);
}

MyString MyString::operator=(MyString obj) {
    str = new char[strlen(obj.str) + 1];
    strcpy(str, obj.str);

    return *this;
}

bool MyString::operator==(MyString obj) {
    return !(strcmp(this->str, obj.str));
}

bool MyString::operator!=(MyString obj) {
    return (strcmp(this->str, obj.str));
}

bool MyString::operator<(MyString obj) {
    if (strcmp(this->str, obj.str) >= 0)
        return false;
    else
        return true;
}

bool MyString::operator>(MyString obj) {
    if (strcmp(this->str, obj.str) >= 0)
        return true;
    else
        return false;
}

char MyString::operator[](int counter)
{
    if (strlen(this->str) < counter || counter < 0)
        return '?';
    else
        return this->str[counter];
}

char* MyString::operator()(int begin, int end) {
    if (begin > end || strlen(this->str) < end) {
        char *error = new char[1]; error = "?";
        return error;
    }
    else {
        int count = 0;
        char *tmp = new char[end - begin];
        for (int i = begin; i < end; i++) {
            tmp[count] = this->str[i];
            count++;
        }
        return tmp;
    }
}