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LibJS: Implement Intl.PluralRules.prototype.selectRange

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Timothy Flynn 2022-07-11 11:28:10 -04:00 • committed by Linus Groh
parent a337b059dd
commit f089c11b5b
7 changed files with 150 additions and 0 deletions
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42
Userland/Libraries/LibJS/Runtime/Intl/PluralRules.cpp
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@ -130,4 +130,46 @@ Unicode::PluralCategory resolve_plural(GlobalObject& global_object, NumberFormat
return plural_rule_select(locale, type, number, move(operands));
}
// 1.1.5 PluralRuleSelectRange ( locale, type, xp, yp ), https://tc39.es/proposal-intl-numberformat-v3/out/pluralrules/proposed.html#sec-pluralruleselectrange
Unicode::PluralCategory plural_rule_select_range(StringView locale, Unicode::PluralForm, Unicode::PluralCategory start, Unicode::PluralCategory end)
{
return Unicode::determine_plural_range(locale, start, end);
}
// 1.1.6 ResolvePluralRange ( pluralRules, x, y ), https://tc39.es/proposal-intl-numberformat-v3/out/pluralrules/proposed.html#sec-resolvepluralrange
ThrowCompletionOr<Unicode::PluralCategory> resolve_plural_range(GlobalObject& global_object, PluralRules const& plural_rules, Value start, Value end)
{
auto& vm = global_object.vm();
// 1. Assert: Type(pluralRules) is Object.
// 2. Assert: pluralRules has an [[InitializedPluralRules]] internal slot.
// 3. Assert: Type(x) is Number.
// 4. Assert: Type(y) is Number.
// 5. If x is NaN or y is NaN, throw a RangeError exception.
if (start.is_nan())
return vm.throw_completion<RangeError>(global_object, ErrorType::IntlNumberIsNaN, "start"sv);
if (end.is_nan())
return vm.throw_completion<RangeError>(global_object, ErrorType::IntlNumberIsNaN, "end"sv);
// 6. If x > y, throw a RangeError exception.
if (start.as_double() > end.as_double())
return vm.throw_completion<RangeError>(global_object, ErrorType::IntlStartRangeAfterEndRange, start, end);
// 7. Let xp be ! ResolvePlural(pluralRules, x).
auto start_plurality = resolve_plural(global_object, plural_rules, start);
// 8. Let yp be ! ResolvePlural(pluralRules, y).
auto end_plurality = resolve_plural(global_object, plural_rules, end);
// 9. Let locale be pluralRules.[[Locale]].
auto const& locale = plural_rules.locale();
// 10. Let type be pluralRules.[[Type]].
auto type = plural_rules.type();
// 11. Return ! PluralRuleSelectRange(locale, type, xp, yp).
return plural_rule_select_range(locale, type, start_plurality, end_plurality);
}
}