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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:
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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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48
Libraries/LibJS/Runtime/Intl/LocaleConstructor.cpp
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@ -66,25 +66,61 @@ static ThrowCompletionOr<String> update_language_id(VM& vm, StringView tag, Obje
// a. If region cannot be matched by the unicode_region_subtag Unicode locale nonterminal, throw a RangeError exception.
auto region = TRY(get_string_option(vm, options, vm.names.region, Unicode::is_unicode_region_subtag, {}, base_name.region));
// 8. Let allExtensions be the suffix of tag following baseName.
// 8. Let variants be ? GetOption(options, "variants", STRING, EMPTY, GetLocaleVariants(baseName)).
auto variants = TRY(get_string_option(vm, options, vm.names.variants, nullptr, {}, get_locale_variants(*locale_id)));
Vector<String> variant_subtags;
// 9. If variants is not undefined, then
if (variants.has_value()) {
// a. If variants is the empty String, throw a RangeError exception.
if (variants->is_empty())
return vm.throw_completion<RangeError>(ErrorType::OptionIsNotValidValue, *variants, vm.names.variants);
// b. Let lowerVariants be the ASCII-lowercase of variants.
auto lower_variants = variants->to_ascii_lowercase();
// c. Let variantSubtags be StringSplitToList(lowerVariants, "-").
variant_subtags = MUST(lower_variants.split('-', SplitBehavior::KeepEmpty));
HashTable<String> seen_variants;
bool has_duplicate_variant = false;
// d. For each element variant of variantSubtags, do
for (auto const& variant : variant_subtags) {
has_duplicate_variant |= seen_variants.set(variant) != HashSetResult::InsertedNewEntry;
// i. If variant cannot be matched by the unicode_variant_subtag Unicode locale nonterminal, throw a RangeError exception.
if (!Unicode::is_unicode_variant_subtag(variant))
return vm.throw_completion<RangeError>(ErrorType::OptionIsNotValidValue, *variants, vm.names.variants);
}
// e. If variantSubtags contains any duplicate elements, throw a RangeError exception.
if (has_duplicate_variant)
return vm.throw_completion<RangeError>(ErrorType::OptionIsNotValidValue, *variants, vm.names.variants);
}
// 10. Let allExtensions be the suffix of tag following baseName.
auto& extensions = locale_id->extensions;
auto& private_use_extensions = locale_id->private_use_extensions;
// 9. Let newTag be language.
// 11. Let newTag be language.
Unicode::LocaleID new_tag;
new_tag.language_id.language = move(language);
// 10. If script is not undefined, set newTag to the string-concatenation of newTag, "-", and script.
// 12. If script is not undefined, set newTag to the string-concatenation of newTag, "-", and script.
new_tag.language_id.script = move(script);
// 11. If region is not undefined, set newTag to the string-concatenation of newTag, "-", and region.
// 13. If region is not undefined, set newTag to the string-concatenation of newTag, "-", and region.
new_tag.language_id.region = move(region);
// 12. Set newTag to the string-concatenation of newTag and allExtensions.
// 14. If variants is not undefined, set newTag to the string-concatenation of newTag, "-", and variants.
new_tag.language_id.variants = move(variant_subtags);
// 15. Set newTag to the string-concatenation of newTag and allExtensions.
new_tag.extensions = move(extensions);
new_tag.private_use_extensions = move(private_use_extensions);
// 13. Return newTag.
// 16. Return newTag.
return new_tag.to_string();
}