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LibJS: Implement Temporal.Calendar.prototype.monthDayFromFields()
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@ -787,6 +787,85 @@ Optional<ISOYearMonth> iso_year_month_from_fields(GlobalObject& global_object, O
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return ISOYearMonth { .year = result->year, .month = result->month, .reference_iso_day = 1 };
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}
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// 12.1.40 ISOMonthDayFromFields ( fields, options ), https://tc39.es/proposal-temporal/#sec-temporal-isomonthdayfromfields
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Optional<ISOMonthDay> iso_month_day_from_fields(GlobalObject& global_object, Object& fields, Object& options)
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{
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auto& vm = global_object.vm();
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// 1. Assert: Type(fields) is Object.
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// 2. Let overflow be ? ToTemporalOverflow(options).
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auto overflow = to_temporal_overflow(global_object, options);
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if (vm.exception())
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return {};
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// 3. Set fields to ? PrepareTemporalFields(fields, « "day", "month", "monthCode", "year" », «»).
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auto* prepared_fields = prepare_temporal_fields(global_object, fields, { "day"sv, "month"sv, "monthCode"sv, "year"sv }, {});
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if (vm.exception())
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return {};
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// 4. Let month be ? Get(fields, "month").
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auto month_value = prepared_fields->get(vm.names.month);
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if (vm.exception())
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return {};
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// 5. Let monthCode be ? Get(fields, "monthCode").
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auto month_code = prepared_fields->get(vm.names.monthCode);
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if (vm.exception())
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return {};
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// 6. Let year be ? Get(fields, "year").
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auto year = prepared_fields->get(vm.names.year);
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if (vm.exception())
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return {};
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// 7. If month is not undefined, and monthCode and year are both undefined, then
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if (!month_value.is_undefined() && month_code.is_undefined() && year.is_undefined()) {
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// a. Throw a TypeError exception.
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vm.throw_exception<TypeError>(global_object, ErrorType::TemporalMissingRequiredProperty, "monthCode or year");
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return {};
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}
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// 8. Set month to ? ResolveISOMonth(fields).
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auto month = resolve_iso_month(global_object, *prepared_fields);
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if (vm.exception())
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return {};
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// 9. Let day be ? Get(fields, "day").
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auto day = prepared_fields->get(vm.names.day);
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if (vm.exception())
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return {};
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// 10. If day is undefined, throw a TypeError exception.
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if (day.is_undefined()) {
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vm.throw_exception<TypeError>(global_object, ErrorType::TemporalMissingRequiredProperty, vm.names.day.as_string());
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return {};
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}
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// 11. Let referenceISOYear be 1972 (the first leap year after the Unix epoch).
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i32 reference_iso_year = 1972;
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Optional<ISODate> result;
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// 12. If monthCode is undefined, then
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if (month_code.is_undefined()) {
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// a. Let result be ? RegulateISODate(year, month, day, overflow).
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result = regulate_iso_date(global_object, year.as_double(), month, day.as_double(), *overflow);
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if (vm.exception())
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return {};
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}
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// 13. Else,
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else {
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// a. Let result be ? RegulateISODate(referenceISOYear, month, day, overflow).
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result = regulate_iso_date(global_object, reference_iso_year, month, day.as_double(), *overflow);
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if (vm.exception())
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return {};
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}
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// 14. Return the new Record { [[Month]]: result.[[Month]], [[Day]]: result.[[Day]], [[ReferenceISOYear]]: referenceISOYear }.
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return ISOMonthDay { .month = result->month, .day = result->day, .reference_iso_year = reference_iso_year };
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}
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// 12.1.41 ISOYear ( temporalObject ), https://tc39.es/proposal-temporal/#sec-temporal-isoyear
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i32 iso_year(Object& temporal_object)
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{
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