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#pragma once
#include <mbgl/util/optional.hpp>
#include <string>
/*
Use LanguageTag to go back and forth between BCP 47 language tags
and their component language/script/region.
This implementation accepts but will not round-trip additional
variant/extension/privateuse/grandfathered information in a BCP 47 tag.
Why implement this?
Mapbox Style Spec specifies locales with BCP 47
Android and Intl.Collator implementations speak BCP 47 out of the box
Darwin implementation requires translation to "Language Identifier"
We're OK with not supporting extensions, but we want to succesfully
parse any valid BCP 47 tag and get out the base language/script/region.
Mozilla's version: https://dxr.mozilla.org/mozilla-central/source/intl/locale/MozLocale.cpp
Looks like it actually supports a subset of BCP 47.
See https://bugzilla.mozilla.org/show_bug.cgi?id=bcp47
Chromium is based on ICU version: https://ssl.icu-project.org/apiref/icu4c/uloc_8h.html
Getting all the locale information is overkill for us, we just want
language/script/region.
*/
namespace mbgl {
struct LanguageTag {
LanguageTag() = default;
LanguageTag(optional<std::string> language_, optional<std::string> script_, optional<std::string> region_);
static LanguageTag fromBCP47(const std::string& bcp47Tag);
std::string toBCP47() const;
optional<std::string> language; // ISO 639
optional<std::string> script; // ISO 15924
optional<std::string> region; // ISO 3316-1 || UN M.49
};
} // end namespace mbgl
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