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#ifndef STRING_HDR
#define STRING_HDR
#include<iostream>
#include<fstream>
const int MAX_SIZE = 1024;
class String {
private:
char* str;
int len;
void CopyFrom(const String& other);
void Free();
public:
String();
String(char ch);
String(const char* str);
String(const String& other);
String& operator=(const String& other);
~String();
int getLenght() const;
String SubString(int start);
String SubString(int start, int end);
int IndexOf(const String& other, int index); //return the index of the first encounter of other in the object
int IndexOf(const char* str, int index); //reusing IndexOf(const String& other, int index)
int CountOcurences(String str); // How many times a string is found as substring
int GetOcurence(String str,int i); //Get if the i-th substring (count start from 1)
const char& operator[](int index) const;
char& operator[](int index);
String& operator+=(const String& other); //return the concatenation of the object with other
friend bool operator==(const String& lhs, const String& rhs); //return true if two strings are equivalent
friend bool operator!=(const String& lhs, const String& rhs); //return true if two strings are not equivalent
friend std::ostream& operator<<(std::ostream& os, const String& obj);
friend std::istream& operator>>(std::istream& is, String& obj);
String* Split(String str);
};
const String operator+(const String& lhs, const String& rhs);
void String::CopyFrom(const String& other) {
str = new char[strlen(other.str) + 1];
strcpy(str, other.str);
len = other.len;
}
void String::Free() {
delete[] str;
}
String::String() {
str = new char[1];
str[0] = '\0';
len = 0;
}
inline String::String(char ch)
{
str = new char[2];
str[0] = ch;
str[1] = '\0';
len = 1;
}
String::String(const char* str) {
len = strlen(str);
this->str = new char[len + 1];
strcpy(this->str, str);
}
String::String(const String& other) {
CopyFrom(other);
}
String& String::operator=(const String& other) {
if (this != &other) {
Free();
CopyFrom(other);
}
return *this;
}
String::~String() {
Free();
}
int String::getLenght() const {
return len;
}
String String::SubString(int start) {
if (start < 0 || start > len)
throw std::logic_error("Invalid index.\n");
char* newStr = new char[len - start + 2];
int j = 0;
for (int i = start; i < len; i++)
newStr[j++] = str[i];
newStr[j] = '\0';
String newString(newStr);
delete[] newStr;
return newString;
}
String String::SubString(int start, int end) {
if (start < 0 || start > len || end <= 0 || end > len)
throw std::logic_error("Invalid index.\n");
char* newStr = new char[end - start + 2];
int j = 0;
for (int i = start; i <= end; i++)
newStr[j++] = str[i];
newStr[j] = '\0';
String newString(newStr);
delete[] newStr;
return newString;
}
int String::IndexOf(const String& other, int index) {
if(index < 0)
throw std::logic_error("Invalid index.\n");
int iter = 0;
for (int i = index; i <= len; i++) {
if (iter == other.len)
return i - other.len;
if (str[i] != other.str[iter])
iter = 0;
else
iter++;
}
return -1;
}
int String::IndexOf(const char* str, int index) {
String searched(str);
return IndexOf(searched, index);
}
int String::CountOcurences(String str)
{
int count = 0;
int i = IndexOf(str,0);
while (i!=-1)
{
count++;
i = IndexOf(str, i + 1);
}
return count;
}
inline int String::GetOcurence(String str, int num)
{
int count = 0;
int i = IndexOf(str, 0);
while (i != -1)
{
count++;
if (count == num)
return i;
i = IndexOf(str, i + 1);
}
return count;
}
const char& String::operator[](int index) const {
if(index >= len)
throw std::out_of_range("Out of range!");
return str[index];
}
char& String::operator[](int index) {
return str[index];
}
String& String::operator+=(const String& other) {
char* temp = str;
str = new char[len + other.len + 1];
strcpy(str, temp);
strcat(str, other.str);
len += other.len;
delete[] temp;
return *this;
}
bool operator==(const String& lhs, const String& rhs) {
return !strcmp(lhs.str, rhs.str);
}
bool operator!=(const String& lhs, const String& rhs) {
return strcmp(lhs.str, rhs.str);
}
std::ostream& operator<<(std::ostream& os, const String& obj) {
return os << obj.str;
}
std::istream& operator>>(std::istream& is, String& obj) {
char buff[MAX_SIZE];
is.getline(buff, MAX_SIZE);
obj.str = new char[strlen(buff) + 1];
strcpy(obj.str, buff);
return is;
}
const String operator+(const String& lhs, const String& rhs) {
if (lhs.getLenght() == 0)
return rhs;
else if (rhs.getLenght() == 0)
return lhs;
return String(lhs) += rhs;
}
#endif // !STRING_HDR
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