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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2022-2023 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include "std_backend.hpp"
#include <boost/locale/gnu_gettext.hpp>
#include <boost/locale/localization_backend.hpp>
#include <boost/locale/util.hpp>
#include <boost/locale/util/locale_data.hpp>
#include <boost/assert.hpp>
#include <boost/core/ignore_unused.hpp>
#include <algorithm>
#include <iterator>
#include <vector>
#if BOOST_LOCALE_USE_WIN32_API
# ifndef NOMINMAX
# define NOMINMAX
# endif
# include "../win32/lcid.hpp"
# include <windows.h>
#endif
#include "../shared/message.hpp"
#include "../util/encoding.hpp"
#include "../util/gregorian.hpp"
#include "../util/make_std_unique.hpp"
#include "../util/numeric_conversion.hpp"
#include "all_generator.hpp"
namespace {
struct windows_name {
std::string name, codepage;
explicit operator bool() const { return !name.empty() && !codepage.empty(); }
};
windows_name to_windows_name(const std::string& l)
{
#if BOOST_LOCALE_USE_WIN32_API
windows_name res;
const unsigned lcid = boost::locale::impl_win::locale_to_lcid(l);
char win_lang[256]{};
if(lcid == 0 || GetLocaleInfoA(lcid, LOCALE_SENGLANGUAGE, win_lang, sizeof(win_lang)) == 0)
return res;
res.name = win_lang;
char win_country[256]{};
if(GetLocaleInfoA(lcid, LOCALE_SENGCOUNTRY, win_country, sizeof(win_country)) != 0) {
res.name += "_";
res.name += win_country;
}
char win_codepage[10]{};
if(GetLocaleInfoA(lcid, LOCALE_IDEFAULTANSICODEPAGE, win_codepage, sizeof(win_codepage)) != 0)
res.codepage = win_codepage;
return res;
#else
boost::ignore_unused(l);
return {};
#endif
}
bool loadable(const std::string& name)
{
try {
std::locale l(name);
return true;
} catch(const std::exception&) {
return false;
}
}
} // namespace
namespace boost { namespace locale { namespace impl_std {
class std_localization_backend : public localization_backend {
public:
std_localization_backend() : invalid_(true), use_ansi_encoding_(false) {}
std_localization_backend(const std_localization_backend& other) :
localization_backend(), paths_(other.paths_), domains_(other.domains_), locale_id_(other.locale_id_),
invalid_(true), use_ansi_encoding_(other.use_ansi_encoding_)
{}
std_localization_backend* clone() const override { return new std_localization_backend(*this); }
void set_option(const std::string& name, const std::string& value) override
{
invalid_ = true;
if(name == "locale")
locale_id_ = value;
else if(name == "message_path")
paths_.push_back(value);
else if(name == "message_application")
domains_.push_back(value);
else if(name == "use_ansi_encoding")
use_ansi_encoding_ = value == "true";
}
void clear_options() override
{
invalid_ = true;
use_ansi_encoding_ = false;
locale_id_.clear();
paths_.clear();
domains_.clear();
}
void prepare_data()
{
if(!invalid_)
return;
invalid_ = false;
std::string lid = locale_id_;
if(lid.empty()) {
bool use_utf8 = !use_ansi_encoding_;
lid = util::get_system_locale(use_utf8);
}
in_use_id_ = lid;
data_.parse(lid);
const auto l_win = to_windows_name(lid);
if(!data_.is_utf8()) {
utf_mode_ = utf8_support::none;
if(loadable(lid))
name_ = lid;
else if(l_win && loadable(l_win.name)) {
if(util::are_encodings_equal(l_win.codepage, data_.encoding()))
name_ = l_win.name;
else {
int codepage_int;
if(util::try_to_int(l_win.codepage, codepage_int)
&& codepage_int == util::encoding_to_windows_codepage(data_.encoding()))
{
name_ = l_win.name;
} else
name_ = "C";
}
} else
name_ = "C";
} else {
if(loadable(lid)) {
name_ = lid;
utf_mode_ = utf8_support::native;
} else {
std::vector<std::string> alt_names;
if(l_win)
alt_names.push_back(l_win.name);
// Try different spellings
alt_names.push_back(util::locale_data(data_).encoding("UTF-8").to_string());
alt_names.push_back(util::locale_data(data_).encoding("utf8", false).to_string());
// Without encoding, let from_wide classes handle it
alt_names.push_back(util::locale_data(data_).encoding("").to_string());
// Final try: Classic locale, but enable Unicode (if supported)
alt_names.push_back("C.UTF-8");
alt_names.push_back("C.utf8");
// If everything fails rely on the classic locale
alt_names.push_back("C");
for(const std::string& name : alt_names) {
if(loadable(name)) {
name_ = name;
break;
}
}
BOOST_ASSERT(!name_.empty());
utf_mode_ = utf8_support::from_wide;
}
}
}
std::locale install(const std::locale& base, category_t category, char_facet_t type) override
{
prepare_data();
switch(category) {
case category_t::convert: return create_convert(base, name_, type, utf_mode_);
case category_t::collation: return create_collate(base, name_, type, utf_mode_);
case category_t::formatting: return create_formatting(base, name_, type, utf_mode_);
case category_t::parsing: return create_parsing(base, name_, type, utf_mode_);
case category_t::codepage: return create_codecvt(base, name_, type, utf_mode_);
case category_t::calendar: return util::install_gregorian_calendar(base, data_.country());
case category_t::message: return detail::install_message_facet(base, type, data_, domains_, paths_);
case category_t::information: return util::create_info(base, in_use_id_);
case category_t::boundary: break; // Not implemented
}
return base;
}
private:
std::vector<std::string> paths_;
std::vector<std::string> domains_;
std::string locale_id_;
util::locale_data data_;
std::string name_;
std::string in_use_id_;
utf8_support utf_mode_;
bool invalid_;
bool use_ansi_encoding_;
};
std::unique_ptr<localization_backend> create_localization_backend()
{
return make_std_unique<std_localization_backend>();
}
}}} // namespace boost::locale::impl_std
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