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LibJS: Implement Intl.Locale.prototype.variants

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This is a normative change in the ECMA-402 spec. See:
e8c995a
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Timothy Flynn 2025-06-04 10:20:10 -04:00 • committed by Tim Flynn
commit 128675770c
Notes: github-actions[bot] 2025-06-04 21:12:35 +00:00
7 changed files with 123 additions and 7 deletions
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18
Libraries/LibJS/Runtime/Intl/Locale.cpp
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@ -43,6 +43,24 @@ Unicode::LocaleID const& Locale::locale_id() const
return *m_cached_locale_id;
}
// 15.5.5 GetLocaleVariants ( locale ), https://tc39.es/ecma402/#sec-getlocalevariants
Optional<String> get_locale_variants(Unicode::LocaleID const& locale)
{
// 1. Let baseName be GetLocaleBaseName(locale).
auto const& base_name = locale.language_id;
// 2. NOTE: Each subtag in baseName that is preceded by "-" is either a unicode_script_subtag, unicode_region_subtag,
// or unicode_variant_subtag, but any substring matched by unicode_variant_subtag is strictly longer than any
// prefix thereof which could also be matched by one of the other productions.
// 3. Let variants be the longest suffix of baseName that starts with a "-" followed by a substring that is matched
// by the unicode_variant_subtag Unicode locale nonterminal. If there is no such suffix, return undefined.
// 4. Return the substring of variants from 1.
if (base_name.variants.is_empty())
return {};
return MUST(String::join("-"sv, base_name.variants));
}
// 1.1.1 CreateArrayFromListOrRestricted ( list , restricted )
static GC::Ref<Array> create_array_from_list_or_restricted(VM& vm, Vector<String> list, Optional<String> restricted)
{