mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-07-05 16:41:52 +00:00
62793b1bd8
This is an editorial change in the ECMA-402 spec. See:
a2beb66
We implement this change by introducing a virtual interface that all
Intl "service" objects must implement. A future patch will make use of
the virtualized RelevantExtensionKeys and ResolutionOptionDescriptors
accessors, and we will need to be able to use those slots from a generic
instance type.
72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
/*
|
||
* Copyright (c) 2022-2025, Tim Flynn <trflynn89@ladybird.org>
|
||
*
|
||
* SPDX-License-Identifier: BSD-2-Clause
|
||
*/
|
||
|
||
#include <LibJS/Runtime/Intl/PluralRules.h>
|
||
#include <LibJS/Runtime/VM.h>
|
||
|
||
namespace JS::Intl {
|
||
|
||
GC_DEFINE_ALLOCATOR(PluralRules);
|
||
|
||
// 17 PluralRules Objects, https://tc39.es/ecma402/#pluralrules-objects
|
||
PluralRules::PluralRules(Object& prototype)
|
||
: NumberFormatBase(prototype)
|
||
{
|
||
}
|
||
|
||
// 17.2.3 Internal slots, https://tc39.es/ecma402/#sec-intl.pluralrules-internal-slots
|
||
ReadonlySpan<StringView> PluralRules::relevant_extension_keys() const
|
||
{
|
||
// The value of the [[RelevantExtensionKeys]] internal slot is « ».
|
||
return {};
|
||
}
|
||
|
||
// 17.2.3 Internal slots, https://tc39.es/ecma402/#sec-intl.pluralrules-internal-slots
|
||
ReadonlySpan<ResolutionOptionDescriptor> PluralRules::resolution_option_descriptors(VM&) const
|
||
{
|
||
// The value of the [[ResolutionOptionDescriptors]] internal slot is « ».
|
||
return {};
|
||
}
|
||
|
||
// 17.5.2 ResolvePlural ( pluralRules, n ), https://tc39.es/ecma402/#sec-resolveplural
|
||
Unicode::PluralCategory resolve_plural(PluralRules const& plural_rules, Value number)
|
||
{
|
||
// 1. If n is not a finite Number, then
|
||
if (!number.is_finite_number()) {
|
||
// a. Let s be ! ToString(n).
|
||
// b. Return the Record { [[PluralCategory]]: "other", [[FormattedString]]: s }.
|
||
return Unicode::PluralCategory::Other;
|
||
}
|
||
|
||
// 2. Let res be FormatNumericToString(pluralRules, ℝ(n)).
|
||
// 3. Let s be res.[[FormattedString]].
|
||
// 4. Let locale be pluralRules.[[Locale]].
|
||
// 5. Let type be pluralRules.[[Type]].
|
||
// 6. Let p be PluralRuleSelect(locale, type, s).
|
||
// 7. Return the Record { [[PluralCategory]]: p, [[FormattedString]]: s }.
|
||
return plural_rules.formatter().select_plural(number.as_double());
|
||
}
|
||
|
||
// 17.5.4 ResolvePluralRange ( pluralRules, x, y ), https://tc39.es/ecma402/#sec-resolveplural
|
||
ThrowCompletionOr<Unicode::PluralCategory> resolve_plural_range(VM& vm, PluralRules const& plural_rules, Value start, Value end)
|
||
{
|
||
// 1. If x is NaN or y is NaN, throw a RangeError exception.
|
||
if (start.is_nan())
|
||
return vm.throw_completion<RangeError>(ErrorType::NumberIsNaN, "start"sv);
|
||
if (end.is_nan())
|
||
return vm.throw_completion<RangeError>(ErrorType::NumberIsNaN, "end"sv);
|
||
|
||
// 2. Let xp be ResolvePlural(pluralRules, x).
|
||
// 3. Let yp be ResolvePlural(pluralRules, y).
|
||
// 4. If xp.[[FormattedString]] is yp.[[FormattedString]], then
|
||
// a. Return xp.[[PluralCategory]].
|
||
// 5. Let locale be pluralRules.[[Locale]].
|
||
// 6. Let type be pluralRules.[[Type]].
|
||
// 7. Return PluralRuleSelectRange(locale, type, xp.[[PluralCategory]], yp.[[PluralCategory]]).
|
||
return plural_rules.formatter().select_plural_range(start.as_double(), end.as_double());
|
||
}
|
||
|
||
}
|