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LibJS: Implement Temporal.Duration.prototype.round

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Until we have re-implemented Temporal.PlainDate/ZonedDateTime, some of
Temporal.Duration.prototype.round (and its invoked AOs) are left
unimplemented.
This commit is contained in:
Timothy Flynn 2024-11-18 14:41:29 -05:00 • committed by Tim Flynn
commit 5689621c2b
Notes: github-actions[bot] 2024-11-21 00:05:45 +00:00
7 changed files with 450 additions and 0 deletions
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16
Libraries/LibJS/Runtime/Temporal/Duration.cpp
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@ -9,6 +9,7 @@
#include <AK/Math.h>
#include <AK/NumericLimits.h>
#include <LibCrypto/BigFraction/BigFraction.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Intrinsics.h>
#include <LibJS/Runtime/Realm.h>
@ -740,6 +741,21 @@ ThrowCompletionOr<TimeDuration> round_time_duration(VM& vm, TimeDuration const&
return TRY(round_time_duration_to_increment(vm, time_duration, divisor.multiplied_by(increment), rounding_mode));
}
// 7.5.31 TotalTimeDuration ( timeDuration, unit ), https://tc39.es/proposal-temporal/#sec-temporal-totaltimeduration
double total_time_duration(TimeDuration const& time_duration, Unit unit)
{
// 1. Let divisor be the value in the "Length in Nanoseconds" column of the row of Table 21 whose "Value" column contains unit.
auto const& divisor = temporal_unit_length_in_nanoseconds(unit);
// 2. NOTE: The following step cannot be implemented directly using floating-point arithmetic when 𝔽(timeDuration) is
// not a safe integer. The division can be implemented in C++ with the __float128 type if the compiler supports it,
// or with software emulation such as in the SoftFP library.
// 3. Return timeDuration / divisor.
auto result = Crypto::BigFraction { time_duration } / Crypto::BigFraction { Crypto::SignedBigInteger { divisor } };
return result.to_double();
}
// 7.5.39 TemporalDurationToString ( duration, precision ), https://tc39.es/proposal-temporal/#sec-temporal-temporaldurationtostring
String temporal_duration_to_string(Duration const& duration, Precision precision)
{