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LibJS: Implement Temporal.TimeZone.prototype.getPossibleInstantsFor()

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Linus Groh 2021-10-30 10:22:19 +02:00
parent 82792a6815
commit 5fde02184d
6 changed files with 92 additions and 0 deletions
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14
Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
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@ -154,6 +154,20 @@ ISODateTime get_iso_parts_from_epoch(BigInt const& epoch_nanoseconds)
return { .year = year, .month = month, .day = day, .hour = hour, .minute = minute, .second = second, .millisecond = millisecond, .microsecond = microsecond, .nanosecond = nanosecond };
}
// 11.6.4 GetIANATimeZoneEpochValue ( timeZoneIdentifier, year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/proposal-temporal/#sec-temporal-getianatimezoneepochvalue
MarkedValueList get_iana_time_zone_epoch_value(GlobalObject& global_object, StringView time_zone_identifier, i32 year, u8 month, u8 day, u8 hour, u8 minute, u8 second, u16 millisecond, u16 microsecond, u16 nanosecond)
{
// The abstract operation GetIANATimeZoneEpochValue is an implementation-defined algorithm that returns a List of integers. Each integer in the List represents a number of nanoseconds since the Unix epoch in UTC that may correspond to the given calendar date and wall-clock time in the IANA time zone identified by timeZoneIdentifier.
// When the input represents a local time repeating multiple times at a negative time zone transition (e.g. when the daylight saving time ends or the time zone offset is decreased due to a time zone rule change), the returned List will have more than one element. When the input represents a skipped local time at a positive time zone transition (e.g. when the daylight saving time starts or the time zone offset is increased due to a time zone rule change), the returned List will be empty. Otherwise, the returned List will have one element.
VERIFY(time_zone_identifier == "UTC"sv);
// FIXME: MarkedValueList<T> for T != Value would still be nice.
auto& vm = global_object.vm();
auto list = MarkedValueList { vm.heap() };
list.append(get_epoch_from_iso_parts(global_object, year, month, day, hour, minute, second, millisecond, microsecond, nanosecond));
return list;
}
// 11.6.5 GetIANATimeZoneOffsetNanoseconds ( epochNanoseconds, timeZoneIdentifier ), https://tc39.es/proposal-temporal/#sec-temporal-getianatimezoneoffsetnanoseconds
i64 get_iana_time_zone_offset_nanoseconds([[maybe_unused]] BigInt const& epoch_nanoseconds, [[maybe_unused]] String const& time_zone_identifier)
{