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LibUnicode: Implement the Remove Likely Subtags method

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Unlike Add Likely Subtags, this method doesn't require generated data.
Instead, it is defined in terms of Add Likely Subtags.
This commit is contained in:
Timothy Flynn 2021-09-02 21:44:12 -04:00 committed by Linus Groh
parent 0b1f5118d5
commit a77f323dfb
2 changed files with 48 additions and 0 deletions
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46
Userland/Libraries/LibUnicode/Locale.cpp
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@ -843,6 +843,52 @@ Optional<LanguageID> add_likely_subtags([[maybe_unused]] LanguageID const& langu
#endif
}
Optional<LanguageID> remove_likely_subtags([[maybe_unused]] LanguageID const& language_id)
{
#if ENABLE_UNICODE_DATA
// https://www.unicode.org/reports/tr35/#Likely_Subtags
auto return_language_and_variants = [](auto language, auto variants) {
language.variants = move(variants);
return language;
};
// 1. First get max = AddLikelySubtags(inputLocale). If an error is signaled, return it.
auto maximized = add_likely_subtags(language_id);
if (!maximized.has_value())
return {};
// 2. Remove the variants from max.
auto variants = move(maximized->variants);
// 3. Get the components of the max (languagemax, scriptmax, regionmax).
auto language_max = maximized->language;
auto script_max = maximized->script;
auto region_max = maximized->region;
// 4. Then for trial in {languagemax, languagemax_regionmax, languagemax_scriptmax}:
// If AddLikelySubtags(trial) = max, then return trial + variants.
auto run_trial = [&](Optional<String> language, Optional<String> script, Optional<String> region) -> Optional<LanguageID> {
LanguageID trial { .language = move(language), .script = move(script), .region = move(region) };
if (add_likely_subtags(trial) == maximized)
return return_language_and_variants(move(trial), move(variants));
return {};
};
if (auto trial = run_trial(language_max, {}, {}); trial.has_value())
return trial;
if (auto trial = run_trial(language_max, {}, region_max); trial.has_value())
return trial;
if (auto trial = run_trial(language_max, script_max, {}); trial.has_value())
return trial;
// 5. If you do not get a match, return max + variants.
return return_language_and_variants(maximized.release_value(), move(variants));
#else
return {};
#endif
}
String resolve_most_likely_territory([[maybe_unused]] LanguageID const& language_id, StringView territory_alias)
{
auto aliases = territory_alias.split_view(' ');

2
Userland/Libraries/LibUnicode/Locale.h
View file

@ -18,6 +18,7 @@ namespace Unicode {
struct LanguageID {
String to_string() const;
bool operator==(LanguageID const&) const = default;
bool is_root { false };
Optional<String> language {};
@ -131,6 +132,7 @@ Optional<StringView> resolve_variant_alias(StringView variant);
Optional<StringView> resolve_subdivision_alias(StringView subdivision);
Optional<LanguageID> add_likely_subtags(LanguageID const& language_id);
Optional<LanguageID> remove_likely_subtags(LanguageID const& language_id);
String resolve_most_likely_territory(LanguageID const& language_id, StringView territory_alias);
}