0a8edd5ce7
This commit adds the PlainYearMonth object itself, its constructor and prototype (currently empty), and the CreateTemporalYearMonth and ISOYearMonthWithinLimits abstract operations.
109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@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/AbstractOperations.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Temporal/PlainDate.h>
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#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
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#include <LibJS/Runtime/Temporal/PlainYearMonthConstructor.h>
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namespace JS::Temporal {
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// 9 Temporal.PlainYearMonth Objects, https://tc39.es/proposal-temporal/#sec-temporal-plainyearmonth-objects
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PlainYearMonth::PlainYearMonth(i32 iso_year, u8 iso_month, u8 iso_day, Object& calendar, Object& prototype)
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: Object(prototype)
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, m_iso_year(iso_year)
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, m_iso_month(iso_month)
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, m_iso_day(iso_day)
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, m_calendar(calendar)
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{
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}
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void PlainYearMonth::visit_edges(Visitor& visitor)
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{
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visitor.visit(&m_calendar);
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}
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// 9.5.5 BalanceISOYearMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-balanceisoyearmonth
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ISOYearMonth balance_iso_year_month(i32 year, i32 month)
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{
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// 1. Assert: year and month are integers.
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// 2. Set year to year + floor((month - 1) / 12).
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year += (month - 1) / 12;
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// 3. Set month to (month − 1) modulo 12 + 1.
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month = (month - 1) % 12 + 1;
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// 4. Return the new Record { [[Year]]: year, [[Month]]: month }.
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return ISOYearMonth { .year = year, .month = static_cast<u8>(month) };
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}
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// 9.5.4 ISOYearMonthWithinLimits ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-isoyearmonthwithinlimits
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bool iso_year_month_within_limits(i32 year, u8 month)
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{
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// 1. Assert: year and month are integers.
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// 2. If year < −271821 or year > 275760, then
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if (year < -271821 || year > 275760) {
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// a. Return false.
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return false;
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}
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// 3. If year is −271821 and month < 4, then
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if (year == -271821 && month < 4) {
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// a. Return false.
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return false;
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}
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// 4. If year is 275760 and month > 9, then
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if (year == 275760 && month > 9) {
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// a. Return false.
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return false;
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}
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// 5. Return true.
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return true;
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}
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// 9.5.7 CreateTemporalYearMonth ( isoYear, isoMonth, calendar, referenceISODay [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporalyearmonth
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PlainYearMonth* create_temporal_year_month(GlobalObject& global_object, i32 iso_year, u8 iso_month, Object& calendar, u8 reference_iso_day, FunctionObject* new_target)
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{
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auto& vm = global_object.vm();
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// 1. Assert: isoYear, isoMonth, and referenceISODay are integers.
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// 2. Assert: Type(calendar) is Object.
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// 3. If ! IsValidISODate(isoYear, isoMonth, referenceISODay) is false, throw a RangeError exception.
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if (!is_valid_iso_date(iso_year, iso_month, reference_iso_day)) {
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vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
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return {};
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}
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// 4. If ! ISOYearMonthWithinLimits(isoYear, isoMonth) is false, throw a RangeError exception.
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if (!iso_year_month_within_limits(iso_year, iso_month)) {
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vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainYearMonth);
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return {};
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}
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// 5. If newTarget is not present, set it to %Temporal.PlainYearMonth%.
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if (!new_target)
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new_target = global_object.temporal_plain_year_month_constructor();
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// 6. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.PlainYearMonth.prototype%", « [[InitializedTemporalYearMonth]], [[ISOYear]], [[ISOMonth]], [[ISODay]], [[Calendar]] »).
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// 7. Set object.[[ISOYear]] to isoYear.
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// 8. Set object.[[ISOMonth]] to isoMonth.
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// 9. Set object.[[Calendar]] to calendar.
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// 10. Set object.[[ISODay]] to referenceISODay.
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auto* object = ordinary_create_from_constructor<PlainYearMonth>(global_object, *new_target, &GlobalObject::temporal_plain_year_month_prototype, iso_year, iso_month, reference_iso_day, calendar);
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if (vm.exception())
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return {};
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// 11. Return object.
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return object;
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}
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}
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