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This uses ICU for all of the Intl.PluralRules prototypes, which lets us remove all data from our plural rules generator. Plural rules depend directly on internal data from the number formatter, so rather than creating a separate Locale::PluralRules class (which will make accessing that data awkward), this adds plural rules APIs to the existing Locale::NumberFormat.
58 lines
2.2 KiB
C++
58 lines
2.2 KiB
C++
/*
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* Copyright (c) 2022-2024, Tim Flynn <trflynn89@serenityos.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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namespace JS::Intl {
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JS_DEFINE_ALLOCATOR(PluralRules);
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// 16 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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// 16.5.4 ResolvePlural ( pluralRules, n ), https://tc39.es/ecma402/#sec-resolveplural
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::Locale::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 ::Locale::PluralCategory::Other;
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}
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// 2. Let locale be pluralRules.[[Locale]].
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// 3. Let type be pluralRules.[[Type]].
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// 4. Let res be FormatNumericToString(pluralRules, ℝ(n)).
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// 5. Let s be res.[[FormattedString]].
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// 6. Let operands be GetOperands(s).
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// 7. Let p be PluralRuleSelect(locale, type, n, operands).
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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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// 16.5.6 ResolvePluralRange ( pluralRules, x, y ), https://tc39.es/ecma402/#sec-resolveplural
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ThrowCompletionOr<::Locale::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. Return PluralRuleSelectRange(locale, type, 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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