#include "pistring.h"


PIString & PIString::operator +=(const char * str) {
	uint i = 0;
	while (str[i] != '\0') push_back(str[i++]);
	return *this;
}


PIString & PIString::operator +=(const string & str) {
	uint l = str.size();
	for (uint i = 0; i < l; ++i) push_back(str[i]);
	return *this;
}


PIString & PIString::operator +=(const PIString & str) {
	uint l = str.size();
	for (uint i = 0; i < l; ++i) push_back(str[i]);
	return *this;
}


bool PIString::operator ==(const PIString & str) const {
	uint l = str.size();
	if (size() != l) return false;
	for (uint i = 0; i < l; ++i)
		if (str[i] != at(i))
			return false;
	return true;
}


bool PIString::operator !=(const PIString & str) const {
	uint l = str.size();
	if (size() != l) return true;
	for (uint i = 0; i < l; ++i)
		if (str[i] != at(i))
			return true;
	return false;
}


PIString PIString::mid(const int start, const int len) const {
	PIString str;
	int s = start, l = len;
	if (l == 0) return str;
	if (s < 0) {
		l += s;
		s = 0;
	}
	if (l < 0) {
		for (uint i = s; i < size(); ++i)
			str += at(i);
	} else {
		if (l > length() - s)
			l = length() - s;
		for (int i = s; i < s + l; ++i)
			str += at(i);
	}
	return str;
}


PIString & PIString::cutMid(const int start, const int len) {
	int s = start, l = len;
	if (l == 0) return *this;
	if (s < 0) {
		l += s;
		s = 0;
	}
	if (l < 0)
		erase(begin() + s, end());
	else {
		if (l > length() - s)
			l = length() - s;
		erase(begin() + s, begin() + s + l);
	}
	return *this;
}


PIString PIString::trimmed() const {
	int st = 0, fn = 0;
	for (int i = 0; i < length(); ++i)
		if (at(i) != ' ' && at(i) != '\t')
			{st = i; break;}
	for (int i = length() - 1; i >= 0; --i)
		if (at(i) != ' ' && at(i) != '\t')
			{fn = i; break;}
	return mid(st, fn - st + 1);
}


PIString & PIString::trim() {
	int st = 0, fn = 0;
	for (int i = 0; i < length(); ++i)
		if (at(i) != ' ' && at(i) != '\t')
			{st = i; break;}
	for (int i = length() - 1; i >= 0; --i)
		if (at(i) != ' ' && at(i) != '\t')
			{fn = i; break;}
	return cutMid(st, fn - st + 1);
}


int PIString::find(const char str, const int start) {
	for (int i = start; i < length(); ++i)
		if (at(i) == str)
			return i;
	return -1;
}


int PIString::find(const PIString str, const int start) {
	int l = str.length();
	for (int i = start; i < length() - l + 1; ++i)
		if (mid(i, l) == str)
			return i;
	return -1;
}


int PIString::findLast(const char str, const int start) {
	for (int i = length() - 1; i >= start; --i)
		if (at(i) == str)
			return i;
	return -1;
}


int PIString::findLast(const PIString str, const int start) {
	int l = str.length();
	for (int i = length() - l; i >= start; --i)
		if (mid(i, l) == str)
			return i;
	return -1;
}


PIString PIString::toUpperCase() const {
	PIString str(*this);
	int l = str.size();
	for (int i = 0; i < l; ++i) str[i] = chrUpr(str[i]);
	return str;
}


PIString PIString::toLowerCase() const {
	PIString str(*this);
	int l = str.size();
	for (int i = 0; i < l; ++i) str[i] = chrLwr(str[i]);
	return str;
}


char chrUpr(char c) {
	if (c >= 'a' && c <= 'z') return c + 'A' - 'a';
	//if (c >= 'а' && c <= 'я') return c + 'А' - 'а';
	return c;
}


char chrLwr(char c) {
	if (c >= 'A' && c <= 'Z') return c + 'a' - 'A';
	//if (c >= 'А' && c <= 'Я') return c + 'а' - 'А';
	return c;
}