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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/locale/conversion.hpp>
#include <boost/locale/encoding.hpp>
#include <boost/locale/generator.hpp>
#include <locale>
#include <stdexcept>
#include <vector>
#include "all_generator.hpp"
namespace boost { namespace locale { namespace impl_std {
template<typename CharType>
class std_converter : public converter<CharType> {
public:
typedef std::basic_string<CharType> string_type;
typedef std::ctype<CharType> ctype_type;
std_converter(const std::string& locale_name) :
base_(std::locale::classic(), new std::ctype_byname<CharType>(locale_name))
{}
string_type convert(converter_base::conversion_type how,
const CharType* begin,
const CharType* end,
int /*flags*/ = 0) const override
{
switch(how) {
case converter_base::upper_case:
case converter_base::lower_case:
case converter_base::case_folding: {
const ctype_type& ct = std::use_facet<ctype_type>(base_);
size_t len = end - begin;
std::vector<CharType> res(len + 1, 0);
CharType* lbegin = res.data();
std::copy(begin, end, lbegin);
if(how == converter_base::upper_case)
ct.toupper(lbegin, lbegin + len);
else
ct.tolower(lbegin, lbegin + len);
return string_type(lbegin, len);
}
case converter_base::normalization:
case converter_base::title_case: break;
}
return string_type(begin, end - begin);
}
private:
std::locale base_;
};
template<typename U8Char>
class utf8_converter : public converter<U8Char> {
public:
typedef std::basic_string<U8Char> string_type;
typedef std::ctype<wchar_t> wctype_type;
utf8_converter(const std::string& locale_name) :
base_(std::locale::classic(), new std::ctype_byname<wchar_t>(locale_name))
{}
string_type convert(converter_base::conversion_type how,
const U8Char* begin,
const U8Char* end,
int /*flags*/ = 0) const override
{
using conversion_type = converter_base::conversion_type;
switch(how) {
case conversion_type::upper_case:
case conversion_type::lower_case:
case conversion_type::case_folding: {
std::wstring tmp = conv::utf_to_utf<wchar_t>(begin, end);
const wctype_type& ct = std::use_facet<wctype_type>(base_);
wchar_t* lbegin = &tmp.front();
const size_t len = tmp.size();
if(how == conversion_type::upper_case)
ct.toupper(lbegin, lbegin + len);
else
ct.tolower(lbegin, lbegin + len);
return conv::utf_to_utf<U8Char>(lbegin, lbegin + len);
}
case conversion_type::title_case:
case conversion_type::normalization: break;
}
return string_type(begin, end - begin);
}
private:
std::locale base_;
};
std::locale
create_convert(const std::locale& in, const std::string& locale_name, char_facet_t type, utf8_support utf)
{
switch(type) {
case char_facet_t::nochar: break;
case char_facet_t::char_f:
if(utf != utf8_support::none)
return std::locale(in, new utf8_converter<char>(locale_name));
else
return std::locale(in, new std_converter<char>(locale_name));
case char_facet_t::wchar_f: return std::locale(in, new std_converter<wchar_t>(locale_name));
#ifdef __cpp_lib_char8_t
case char_facet_t::char8_f: return std::locale(in, new utf8_converter<char8_t>(locale_name));
#elif defined(__cpp_char8_t)
case char_facet_t::char8_f: break;
#endif
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
case char_facet_t::char16_f: return std::locale(in, new std_converter<char16_t>(locale_name));
#endif
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
case char_facet_t::char32_f: return std::locale(in, new std_converter<char32_t>(locale_name));
#endif
}
return in;
}
}}} // namespace boost::locale::impl_std
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