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module;
#include <boost/locale.hpp>
#include <unicode/localematcher.h>
export module routemon:locale;
import std;
import :util;
export namespace blocale = boost::locale;
export namespace routemon {
using lformat = blocale::format;
using blocale::gettext;
using blocale::translate;
} // namespace routemon
namespace routemon::locale {
export template <class T>
concept locale_input_range =
std::ranges::input_range<T>
&& std::
same_as<std::locale const&, std::ranges::range_const_reference_t<T>>;
// Helps select a locale based on the Accept-Language header in an
// HTTP request.
export class selector
{
std::locale default_;
icu::LocaleMatcher matcher_;
std::shared_ptr<blocale::generator const> lgen_;
auto make_matcher(
locale_input_range auto supported_locales, std::locale default_locale)
{
auto builder = icu::LocaleMatcher::Builder{};
for (auto const& supported_locale : supported_locales)
{
auto const& supported_locale_info =
std::use_facet<blocale::info>(supported_locale);
auto supported_icu_locale =
icu::Locale{supported_locale_info.name().c_str()};
if (supported_icu_locale.isBogus())
throw std::runtime_error{
"supported locale gives rise to bogus ICU locale"
};
builder.addSupportedLocale(supported_icu_locale);
}
auto const& default_locale_info =
std::use_facet<blocale::info>(default_locale);
auto default_icu_locale = icu::Locale{default_locale_info.name().c_str()};
if (default_icu_locale.isBogus())
throw std::runtime_error{"default locale gives rise to bogus ICU locale"};
builder.setDefaultLocale(&default_icu_locale);
auto ec = UErrorCode::U_ZERO_ERROR;
auto matcher = builder.build(ec);
if (U_FAILURE(ec))
throw std::runtime_error{"failed to build icu::LocaleMatcher"};
return matcher;
}
// Trimming optional whitespace as defined in RFC 9110, § 12.4.2.
static auto ltrim_ows(std::string_view s) -> std::string_view;
static auto rtrim_ows(std::string_view s) -> std::string_view;
static auto trim_ows(std::string_view s) -> std::string_view;
auto from_icu_locale(icu::Locale const& l) const -> std::locale;
public:
// Note: lgen must live at least as long as the selector constructed here!
// It is unfortunately not possible to copy/move a blocale::generator.
explicit selector(
locale_input_range auto locales, std::locale default_,
std::shared_ptr<blocale::generator const> lgen)
: default_{default_}, matcher_{make_matcher(locales, default_)}, lgen_{lgen}
{
}
auto select(std::string_view accept_language) const -> std::locale;
};
auto to_bcp47_lang_tag(std::locale locale) -> std::optional<std::string>;
export auto make_generator() -> std::shared_ptr<blocale::generator const>;
} // namespace routemon::locale
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