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LibJS: Implement Temporal.Calendar.prototype.yearMonthFromFields()

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Linus Groh 2021-08-16 00:35:05 +01:00
parent c1c12497b5
commit ed9d37bd40
10 changed files with 223 additions and 14 deletions
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43
Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -714,6 +715,48 @@ Optional<ISODate> iso_date_from_fields(GlobalObject& global_object, Object& fiel
return regulate_iso_date(global_object, year.as_double(), month, day.as_double(), *overflow);
}
// 12.1.39 ISOYearMonthFromFields ( fields, options ), https://tc39.es/proposal-temporal/#sec-temporal-isoyearmonthfromfields
Optional<ISOYearMonth> iso_year_month_from_fields(GlobalObject& global_object, Object& fields, Object& options)
{
auto& vm = global_object.vm();
// 1. Assert: Type(fields) is Object.
// 2. Let overflow be ? ToTemporalOverflow(options).
auto overflow = to_temporal_overflow(global_object, options);
if (vm.exception())
return {};
// 3. Set fields to ? PrepareTemporalFields(fields, « "month", "monthCode", "year" », «»).
auto* prepared_fields = prepare_temporal_fields(global_object, fields, { "month"sv, "monthCode"sv, "year"sv }, {});
if (vm.exception())
return {};
// 4. Let year be ? Get(fields, "year").
auto year = prepared_fields->get(vm.names.year);
if (vm.exception())
return {};
// 5. If year is undefined, throw a TypeError exception.
if (year.is_undefined()) {
vm.throw_exception<TypeError>(global_object, ErrorType::TemporalMissingRequiredProperty, vm.names.year.as_string());
return {};
}
// 6. Let month be ? ResolveISOMonth(fields).
auto month = resolve_iso_month(global_object, *prepared_fields);
if (vm.exception())
return {};
// 7. Let result be ? RegulateISOYearMonth(year, month, overflow).
auto result = regulate_iso_year_month(global_object, year.as_double(), month, *overflow);
if (vm.exception())
return {};
// 8. Return the new Record { [[Year]]: result.[[Year]], [[Month]]: result.[[Month]], [[ReferenceISODay]]: 1 }.
return ISOYearMonth { .year = result->year, .month = result->month, .reference_iso_day = 1 };
}
// 12.1.41 ISOYear ( temporalObject ), https://tc39.es/proposal-temporal/#sec-temporal-isoyear
i32 iso_year(Object& temporal_object)
{