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74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/*
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* Copyright (c) 2022-2025, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/Intl/PluralRules.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS::Intl {
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GC_DEFINE_ALLOCATOR(PluralRules);
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// 17 PluralRules Objects, https://tc39.es/ecma402/#pluralrules-objects
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PluralRules::PluralRules(Object& prototype)
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: NumberFormatBase(prototype)
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{
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}
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// 17.2.3 Internal slots, https://tc39.es/ecma402/#sec-intl.pluralrules-internal-slots
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ReadonlySpan<StringView> PluralRules::relevant_extension_keys() const
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{
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// The value of the [[RelevantExtensionKeys]] internal slot is « ».
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return {};
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}
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// 17.2.3 Internal slots, https://tc39.es/ecma402/#sec-intl.pluralrules-internal-slots
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ReadonlySpan<ResolutionOptionDescriptor> PluralRules::resolution_option_descriptors(VM&) const
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{
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// The value of the [[ResolutionOptionDescriptors]] internal slot is « ».
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return {};
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}
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// 17.5.2 ResolvePlural ( pluralRules, n ), https://tc39.es/ecma402/#sec-resolveplural
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Unicode::PluralCategory resolve_plural(PluralRules const& plural_rules, Value number)
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{
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// 1. If n is not a finite Number, then
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if (!number.is_finite_number()) {
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// a. Let s be ! ToString(n).
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// b. Return the Record { [[PluralCategory]]: "other", [[FormattedString]]: s }.
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return Unicode::PluralCategory::Other;
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}
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// 2. Let res be FormatNumericToString(pluralRules, ℝ(n)).
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// 3. Let s be res.[[FormattedString]].
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// 4. Let locale be pluralRules.[[Locale]].
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// 5. Let type be pluralRules.[[Type]].
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// 6. Let notation be pluralRules.[[Notation]].
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// 7. Let p be PluralRuleSelect(locale, type, notation, s).
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// 8. Return the Record { [[PluralCategory]]: p, [[FormattedString]]: s }.
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return plural_rules.formatter().select_plural(number.as_double());
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}
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// 17.5.4 ResolvePluralRange ( pluralRules, x, y ), https://tc39.es/ecma402/#sec-resolveplural
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ThrowCompletionOr<Unicode::PluralCategory> resolve_plural_range(VM& vm, PluralRules const& plural_rules, Value start, Value end)
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{
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// 1. If x is NaN or y is NaN, throw a RangeError exception.
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if (start.is_nan())
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return vm.throw_completion<RangeError>(ErrorType::NumberIsNaN, "start"sv);
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if (end.is_nan())
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return vm.throw_completion<RangeError>(ErrorType::NumberIsNaN, "end"sv);
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// 2. Let xp be ResolvePlural(pluralRules, x).
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// 3. Let yp be ResolvePlural(pluralRules, y).
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// 4. If xp.[[FormattedString]] is yp.[[FormattedString]], then
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// a. Return xp.[[PluralCategory]].
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// 5. Let locale be pluralRules.[[Locale]].
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// 6. Let type be pluralRules.[[Type]].
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// 7. Let notation be pluralRules.[[Notation]].
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// 8. Return PluralRuleSelectRange(locale, type, notation, xp.[[PluralCategory]], yp.[[PluralCategory]]).
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return plural_rules.formatter().select_plural_range(start.as_double(), end.as_double());
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}
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}
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