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LibJS: Add sign(Crypto::SignedBigInteger const&) overload

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This commit is contained in:
Linus Groh 2021-11-23 22:30:27 +00:00
parent a20b189eab
commit 1e41a8668d
3 changed files with 18 additions and 9 deletions
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14
Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
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@ -952,6 +952,20 @@ double sign(double n)
return 1;
}
double sign(Crypto::SignedBigInteger const& n)
{
// 1. If n is NaN, n is +0𝔽, or n is −0𝔽, return n.
if (n == Crypto::SignedBigInteger { 0 })
return n.is_negative() ? -0 : 0;
// 2. If n < +0𝔽, return −1𝔽.
if (n.is_negative())
return -1;
// 3. Return 1𝔽.
return 1;
}
// 13.29 ConstrainToRange ( x, minimum, maximum ), https://tc39.es/proposal-temporal/#sec-temporal-constraintorange
double constrain_to_range(double x, double minimum, double maximum)
{

1
Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.h
View file

@ -124,6 +124,7 @@ Optional<u16> maximum_temporal_duration_rounding_increment(StringView unit);
ThrowCompletionOr<void> reject_object_with_calendar_or_time_zone(GlobalObject&, Object&);
String format_seconds_string_part(u8 second, u16 millisecond, u16 microsecond, u16 nanosecond, Variant<StringView, u8> const& precision);
double sign(double);
double sign(Crypto::SignedBigInteger const&);
double constrain_to_range(double x, double minimum, double maximum);
i64 round_number_to_increment(double, u64 increment, StringView rounding_mode);
BigInt* round_number_to_increment(GlobalObject&, BigInt const&, u64 increment, StringView rounding_mode);

12
Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
View file

@ -403,13 +403,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(GlobalObject& glo
auto nanoseconds = nanoseconds_bigint.big_integer();
// 3. Let sign be ! ℝ(Sign(𝔽(nanoseconds))).
i8 sign;
if (nanoseconds == Crypto::UnsignedBigInteger { 0 })
sign = 0;
else if (nanoseconds.is_negative())
sign = -1;
else
sign = 1;
auto sign = Temporal::sign(nanoseconds);
// 4. Let dayLengthNs be 8.64 × 10^13.
auto day_length_ns = "86400000000000"_sbigint;
@ -425,7 +419,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(GlobalObject& glo
// a. Return the Record { [[Days]]: the integral part of nanoseconds / dayLengthNs, [[Nanoseconds]]: (abs(nanoseconds) modulo dayLengthNs) × sign, [[DayLength]]: dayLengthNs }.
return NanosecondsToDaysResult {
.days = nanoseconds.divided_by(day_length_ns).quotient.to_double(),
.nanoseconds = make_handle(js_bigint(vm, Crypto::SignedBigInteger { nanoseconds.unsigned_value() }.divided_by(day_length_ns).remainder.multiplied_by(Crypto::SignedBigInteger { sign }))),
.nanoseconds = make_handle(js_bigint(vm, Crypto::SignedBigInteger { nanoseconds.unsigned_value() }.divided_by(day_length_ns).remainder.multiplied_by(Crypto::SignedBigInteger { (i32)sign }))),
.day_length = day_length_ns.to_double()
};
}
@ -484,7 +478,7 @@ ThrowCompletionOr<NanosecondsToDaysResult> nanoseconds_to_days(GlobalObject& glo
day_length_ns = one_day_farther_ns.minus(intermediate_ns);
// c. If (nanoseconds − dayLengthNs) × sign ≥ 0, then
if (nanoseconds.minus(day_length_ns).multiplied_by(Crypto::SignedBigInteger { sign }) >= "0"_sbigint) {
if (nanoseconds.minus(day_length_ns).multiplied_by(Crypto::SignedBigInteger { (i32)sign }) >= "0"_sbigint) {
// i. Set nanoseconds to nanoseconds − dayLengthNs.
nanoseconds = nanoseconds.minus(day_length_ns);