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module;
#include <boost/locale.hpp>
#include <unicode/localematcher.h>
module routemon:locale$impl;
import :locale;
namespace routemon::locale {
struct locale_priority
{
float weight;
std::size_t original_index;
};
auto operator<(locale_priority const& lhs, locale_priority const& rhs) -> bool
{
if (lhs.weight != rhs.weight)
return lhs.weight > rhs.weight;
return lhs.original_index < rhs.original_index;
}
struct icu_locale_hash
{
std::size_t operator()(icu::Locale const& l) const noexcept
{
static_assert(sizeof(std::int32_t) < sizeof(std::size_t));
std::int32_t hash = l.hashCode();
if (hash < 0)
{
return static_cast<std::size_t>(std::numeric_limits<int>::max())
+ static_cast<std::size_t>(-hash) + 1;
}
else
{
return static_cast<std::size_t>(hash);
}
}
};
using icu_locale_priority_map =
std::unordered_map<icu::Locale, locale_priority, icu_locale_hash>;
using icu_priority_locale = std::pair<icu::Locale, locale_priority>;
auto operator<(icu_priority_locale const& lhs, icu_priority_locale const& rhs)
-> bool
{
return lhs.second < rhs.second;
}
class icu_priority_locale_vec_iterator : public icu::Locale::Iterator
{
std::size_t i_ = 0uz;
std::vector<icu_priority_locale> ls_;
public:
explicit icu_priority_locale_vec_iterator(
std::vector<icu_priority_locale>&& ls)
: ls_(std::move(ls))
{
}
auto hasNext() const -> UBool override { return i_ < ls_.size(); }
auto next() -> icu::Locale const& override { return ls_[i_++].first; }
~icu_priority_locale_vec_iterator() override = default;
};
auto to_bcp47_lang_tag(std::locale locale) -> std::optional<std::string>
{
auto const& locale_info = std::use_facet<blocale::info>(locale);
auto ec = UErrorCode::U_ZERO_ERROR;
auto bcp47_lang_tag =
icu::Locale{locale_info.name().c_str()}.toLanguageTag<std::string>(ec);
if (U_FAILURE(ec))
return std::nullopt;
return bcp47_lang_tag;
}
auto bcp47_tag::id = std::locale::id{};
bcp47_tag::bcp47_tag(std::locale locale)
{
auto mtag = to_bcp47_lang_tag(locale);
if (!mtag)
throw std::invalid_argument{
"locale name cannot be expressed as a BCP 47 language tag"
};
tag_ = *mtag;
}
auto bcp47_tag::tag() const -> std::string_view { return tag_; }
auto selector::make_matcher(std::vector<std::locale> const& supported_locales)
-> icu::LocaleMatcher
{
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);
}
builder.setNoDefaultLocale();
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.
auto selector::ltrim_ows(std::string_view s) -> std::string_view
{
if (auto i = s.find_first_not_of(" \t"); i != std::string_view::npos)
s.remove_prefix(i);
return s;
}
auto selector::rtrim_ows(std::string_view s) -> std::string_view
{
if (auto i = s.find_last_not_of(" \t"); i != std::string_view::npos)
return s.substr(0, i + 1);
return s;
}
auto selector::trim_ows(std::string_view s) -> std::string_view
{
return rtrim_ows(ltrim_ows(s));
}
auto selector::select(std::string_view accept_language) const -> std::locale
{
using namespace std::literals::string_view_literals;
// NOTE: can also contain a *;q=0.1
// q should have at most 3 digits after period
auto dlpm = icu_locale_priority_map{};
for (auto const [i, lang_prio] :
accept_language | std::views::split(","sv) | std::views::enumerate)
{
auto [lang_range_ut, mweight_ut] =
util::split_on(std::string_view{lang_prio}, ';');
auto lang_range_str = trim_ows(lang_range_ut);
auto mweight_str = mweight_ut.transform(trim_ows);
if (lang_range_str == "*")
break;
auto ec = UErrorCode::U_ZERO_ERROR;
auto icu_locale = icu::Locale::forLanguageTag(lang_range_str, ec);
if (U_FAILURE(ec) || icu_locale.isBogus())
continue; // ignore this locale
auto weight = 1.0f;
if (mweight_str && mweight_str->starts_with("q="))
{
auto weight_str = mweight_str->substr(2, 4);
if (auto mweight =
util::parse_float(weight_str, std::chars_format::fixed);
mweight && 0.0f < *mweight && *mweight < 1.0f)
{
weight = *mweight;
}
}
if (weight > 0.0f)
{
dlpm[icu_locale] = {
.weight = weight,
.original_index = static_cast<std::size_t>(i),
};
}
else
{
dlpm.erase(icu_locale);
}
}
auto desired_locales =
std::vector<icu_priority_locale>{dlpm.begin(), dlpm.end()};
std::sort(desired_locales.begin(), desired_locales.end());
auto it = icu_priority_locale_vec_iterator{std::move(desired_locales)};
auto ec = UErrorCode::U_ZERO_ERROR;
auto res = matcher_.getBestMatchResult(it, ec);
if (U_FAILURE(ec))
return default_;
auto i = res.getSupportedIndex();
if (i == -1)
return default_;
return supported_[util::size_from_int(i).value()];
}
#ifdef LOCALEDIR
#define LOCALEDIR_AUX_XSTR(s) LOCALEDIR_AUX_STR(s)
#define LOCALEDIR_AUX_STR(s) #s
constexpr auto messages_path = std::string_view{LOCALEDIR_AUX_XSTR(LOCALEDIR)};
#undef LOCALEDIR_AUX_STR
#undef LOCALEDIR_AUX_XSTR
#else // ifdef LOCALEDIR
constexpr auto messages_path = std::string_view{"locale/dev"};
#endif // ifdef LOCALEDIR
export auto make_generator() -> std::shared_ptr<blocale::generator const>
{
auto lgen = std::make_shared<blocale::generator>();
lgen->add_messages_path(std::string{messages_path});
lgen->add_messages_domain("routemon");
return std::static_pointer_cast<blocale::generator const>(lgen);
}
} // namespace routemon::locale
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