matrix_thing/include/raii/string_base.tpp

/**
	This file is a part of rexy's matrix client
	Copyright (C) 2019 rexy712

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef RAII_STRING_BASE_TPP
#define RAII_STRING_BASE_TPP

#include <utility> //forward, move, swap, etc
#include <cstdlib> //memcpy
#include <cstring> //strlen, strcpy

namespace raii{
	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(char* data, size_t len):
		string_base(data, len){}
	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(const char* data, size_t len):
		string_base(reinterpret_cast<char*>(len ? Allocator::copy(data, len+1) : nullptr), len)
	{
		m_data[len] = 0;
	}
	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(const char* data):
		string_base(data ? strlen(data) : 0)
	{
		if(m_length)
			m_data = reinterpret_cast<char*>(Allocator::copy(data, m_length+1));
	}
	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(size_t len):
		string_base(reinterpret_cast<char*>(len ? Allocator::allocate(len+1) : nullptr), len)
	{
		m_data[len] = 0;
	}

	//normal copy and move ctors
	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(const string_intermediary& b):
		string_base(reinterpret_cast<char*>(b.m_length ? Allocator::copy(b.m_data, b.m_length+1) : nullptr), b.m_length){}
	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(string_intermediary&& s):
		string_base(std::exchange(s.m_data, nullptr), s.m_length){}

	template<class Allocator>
	string_intermediary<Allocator>::string_intermediary(const string_base& b):
		string_base(reinterpret_cast<char*>(b.length() ? Allocator::copy(b.get(), b.length()+1) : nullptr), b.length()){}

	//dtor
	template<class Allocator>
	string_intermediary<Allocator>::~string_intermediary(void){
		Allocator::free(m_data);
	}

	template<class Allocator>
	string_intermediary<Allocator>& string_intermediary<Allocator>::operator=(const string_intermediary& s){
		string_intermediary tmp(s);
		return (*this = std::move(tmp));
	}
	template<class Allocator>
	string_intermediary<Allocator>& string_intermediary<Allocator>::operator=(string_intermediary&& s){
		std::swap(m_data, s.m_data);
		m_length = s.m_length;
		return *this;
	}
	//Copy from c string
	template<class Allocator>
	string_intermediary<Allocator>& string_intermediary<Allocator>::operator=(const char* c){
		return _copy_string(c, strlen(c));
	}
	//Copy from other string_base
	template<class Allocator>
	string_intermediary<Allocator>& string_intermediary<Allocator>::operator=(const string_base& s){
		return _copy_string(s.get(), s.length());
	}

	//Replace managed pointer. Frees existing value
	template<class Allocator>
	void string_intermediary<Allocator>::reset(char* val){
		Allocator::free(m_data);
		m_data = val;
		m_length = val ? strlen(val) : 0;
	}
	template<class Allocator>
	void string_intermediary<Allocator>::reset(char* val, size_t len){
		Allocator::free(m_data);
		m_data = val;
		m_length = len;
	}
	template<class Allocator>
	bool string_intermediary<Allocator>::resize(size_t newsize){
		if(newsize < m_length)
			return false;
		string_intermediary tmp(newsize);
		memcpy(tmp.get(), m_data, m_length);
		tmp[m_length] = 0;
		*this = std::move(tmp);
		return true;
	}
	template<class Allocator>
	void string_intermediary<Allocator>::append(const char* data, size_t len){
		string_intermediary tmp(m_length + len);
		memcpy(tmp.m_data, m_data, m_length);
		memcpy(tmp.m_data+m_length, data, len);
		tmp[m_length+len] = 0;
		*this = std::move(tmp);
	}
	template<class Allocator>
	void string_intermediary<Allocator>::append(const char* data){
		size_t len = strlen(data);
		resize(m_length+len);
		memcpy(m_data+m_length, data, len);
		m_length += len;
		m_data[m_length] = 0;
	}
	template<class Allocator>
	void string_intermediary<Allocator>::append(const string_base& s){
		append(s.get());
	}

	template<class Allocator>
	string_intermediary<Allocator>& string_intermediary<Allocator>::_copy_string(const char* s, size_t len){
		if(!len){
			Allocator::free(m_data);
			m_length = 0;
			return *this;
		}
		if(len <= m_length){
			strcpy(m_data, s);
		}else{
			Allocator::free(m_data);
			m_data = reinterpret_cast<char*>(Allocator::copy(s, len+1));
			if(!m_data){
				m_length = 0;
				return *this;
			}
		}
		m_length = len;
		return *this;
	}


	template<class Left, class Right>
	template<class T, class U>
	constexpr string_cat_expr<Left,Right>::string_cat_expr(T&& l, U&& r):
		m_l(std::forward<T>(l)),
		m_r(std::forward<U>(r)){}
	template<class Left, class Right>
	constexpr string_cat_expr<Left,Right>::string_cat_expr(const string_cat_expr& s):
		m_l(std::forward<Left>(s.m_l)),
		m_r(std::forward<Right>(s.m_r)){}
	template<class Left, class Right>
	constexpr string_cat_expr<Left,Right>::string_cat_expr(string_cat_expr&& s):
		m_l(std::forward<Left>(s.m_l)),
		m_r(std::forward<Right>(s.m_r)){}

	template<class Left, class Right>
	constexpr size_t string_cat_expr<Left,Right>::length(void)const{
		return m_l.length() + m_r.length();
	}
	template<class Left, class Right>
	template<class Alloc>
	string_cat_expr<Left,Right>::operator string_intermediary<Alloc>(void){
		string_intermediary<Alloc> ret(length());
		for(size_t i = 0;i < length();++i)
			ret[i] = 'n';
		appender<string_intermediary<Alloc>> append(ret);
		append(*this);
		return ret;
	}
	template<class Left, class Right>
	constexpr const Left& string_cat_expr<Left,Right>::left(void)const{
		return m_l;
	}
	template<class Left, class Right>
	constexpr const Right& string_cat_expr<Left,Right>::right(void)const{
		return m_r;
	}


	template<class Targ>
	appender<Targ>::appender(Targ& t): m_targ(t){}
	template<class Targ>
	template<class L, class R>
	void appender<Targ>::operator()(const string_cat_expr<L,R>& str){
		(*this)(str.left());
		(*this)(str.right());
	}
	template<class Targ>
	void appender<Targ>::operator()(const string_base& str){
		memcpy(m_targ.get()+m_pos, str.get(), str.length());
		m_pos += str.length();
	}

	template<size_t N>
	constexpr static_string::static_string(const char(&str)[N]):
		string_base(const_cast<char*>(str), N){}
	constexpr static_string::static_string(const char* str, size_t len):
		string_base(const_cast<char*>(str), len){}
	constexpr static_string::static_string(const static_string& s):
		string_base(s.m_data, s.m_length){}
	constexpr static_string::static_string(static_string&& s):
		string_base(s.m_data, s.m_length){}

} //namespace raii

#endif