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LibJS: Implement Temporal.Now.plainDate()

...and ten required AOs we didn't have yet:

- BalanceISODate
- BalanceISODateTime
- BalanceISOYearMonth
- BalanceTime
- BuiltinTimeZoneGetPlainDateTimeFor
- GetISOPartsFromEpoch
- GetOffsetNanosecondsFor
- ParseTemporalTimeZone
- SystemDateTime
- ToTemporalTimeZone
This commit is contained in:
Linus Groh 2021-07-27 00:21:16 +01:00
parent 5512ff79f0
commit c303bbde54
18 changed files with 507 additions and 1 deletions

View file

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/*
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
namespace JS::Temporal {
// 9.5.5 BalanceISOYearMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-balanceisoyearmonth
ISOYearMonth balance_iso_year_month(i32 year, i32 month)
{
// 1. Assert: year and month are integers.
// 2. Set year to year + floor((month - 1) / 12).
year += (month - 1) / 12;
// 3. Set month to (month 1) modulo 12 + 1.
month = (month - 1) % 12 + 1;
// 4. Return the new Record { [[Year]]: year, [[Month]]: month }.
return ISOYearMonth { .year = year, .month = static_cast<u8>(month) };
}
}