goldberg_emulator/overlay_experimental/System/Encoding.cpp

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2022-08-05 08:06:42 +02:00
/*
* Copyright (C) Nemirtingas
* This file is part of System.
*
* System is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* System 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with System; if not, see
* <http://www.gnu.org/licenses/>.
*/
#include "System_internals.h"
#include "Encoding.hpp"
#include "utfcpp/utf8.h"
#include <string.h>
#include <algorithm>
namespace System {
namespace Encoding {
namespace details {
template<typename T, size_t s = sizeof(typename T::value_type)>
struct string_deducer
{
static std::string convert_string(T const& str) = delete;
static std::wstring convert_wstring(T const& str) = delete;
};
template<typename T>
struct string_deducer<T, 1>
{
static std::string convert_string(T const& str)
{
return std::string(std::begin(str), std::end(str));
}
static std::wstring convert_wstring(std::string const& str)
{
std::wstring r(std::begin(str), std::end(str));
return r;
}
};
template<typename T>
struct string_deducer<T, 2>
{
static std::string convert_string(T const& str)
{
std::string r;
utf8::utf16to8(std::begin(str), std::end(str), std::back_inserter(r));
return r;
}
static std::wstring convert_wstring(std::string const& str)
{
std::wstring r;
utf8::utf8to16(std::begin(str), std::end(str), std::back_inserter(r));
return r;
}
};
template<typename T>
struct string_deducer<T, 4>
{
static std::string convert_string(T const& str)
{
std::string r;
utf8::utf32to8(std::begin(str), std::end(str), std::back_inserter(r));
return r;
}
static std::wstring convert_wstring(std::string const& str)
{
std::wstring r;
utf8::utf8to32(std::begin(str), std::end(str), std::back_inserter(r));
return r;
}
};
}
std::wstring Utf8ToWChar(std::string const& str)
{
return details::string_deducer<std::wstring>::convert_wstring(str);
}
std::u16string Utf8ToUtf16(std::string const& str)
{
return utf8::utf8to16(str);
}
std::u32string Utf8ToUtf32(std::string const& str)
{
return utf8::utf8to32(str);
}
std::string WCharToUtf8(std::wstring const& str)
{
return details::string_deducer<std::wstring>::convert_string(str);
}
std::string Utf16ToUtf8(std::u16string const& str)
{
return utf8::utf16to8(str);
}
std::string Utf32ToUtf8(std::u32string const& str)
{
return utf8::utf32to8(str);
}
size_t EncodedLength(std::string const& str)
{
return utf8::distance(str.begin(), str.end());
}
}// namespace Encoding
}// namespace System