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LibJS: Implement temporal AO BalancePossiblyInfiniteTimeDuration

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This has the guts of the old temporal AO BalanceDuration with some
differences such as an extra precision of one unit. This appears to be
important for different rounding modes to act as a tiebreaker.

It also does not have any logic regarding a zoned date time 'relative
to' - the spec seems to have this factored in a way where callers are
expected to perform this logic if neccessary.
This commit is contained in:
Shannon Booth 2024-01-10 20:35:09 +13:00 • committed by Andreas Kling
parent 750ecc3f43
commit 276930185a
2 changed files with 169 additions and 0 deletions
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161
Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
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@ -632,6 +632,167 @@ ThrowCompletionOr<TimeDurationRecord> balance_duration(VM& vm, double days, doub
return create_time_duration_record(vm, days, hours * sign, minutes * sign, seconds * sign, milliseconds * sign, microseconds * sign, result_nanoseconds * sign);
}
// 7.5.18 BalancePossiblyInfiniteTimeDuration ( days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds, largestUnit ), https://tc39.es/proposal-temporal/#sec-temporal-balancepossiblyinfinitetimeduration
Variant<TimeDurationRecord, Overflow> balance_possibly_infinite_time_duration(VM& vm, double days, double hours, double minutes, double seconds, double milliseconds, double microseconds, Crypto::SignedBigInteger const& nanoseconds, StringView largest_unit)
{
// 1. Set hours to hours + days × 24.
hours += days * 24.;
// 2. Set nanoseconds to TotalDurationNanoseconds(hours, minutes, seconds, milliseconds, microseconds, nanoseconds).
// FIXME: We shouldn't be passing through 0 days and 0 offset digit
auto nanoseconds_bigint = total_duration_nanoseconds(0, hours, minutes, seconds, milliseconds, microseconds, Crypto::SignedBigInteger { nanoseconds }, 0);
double result_nanoseconds = 0;
// 3. Set days, hours, minutes, seconds, milliseconds, and microseconds to 0.
days = 0;
hours = 0;
minutes = 0;
seconds = 0;
milliseconds = 0;
microseconds = 0;
// 4. If nanoseconds < 0, let sign be -1; else, let sign be 1.
auto sign = nanoseconds_bigint.is_negative() ? -1 : 1;
// 5. Set nanoseconds to abs(nanoseconds).
auto total_nanoseconds = Crypto::SignedBigInteger { nanoseconds_bigint.unsigned_value() };
// 6. If largestUnit is "year", "month", "week", or "day", then
if (largest_unit.is_one_of("year"sv, "month"sv, "week"sv, "day"sv)) {
// a. Set microseconds to floor(nanoseconds / 1000).
auto nanoseconds_division_result = total_nanoseconds.divided_by(Crypto::UnsignedBigInteger(1000));
// b. Set nanoseconds to nanoseconds modulo 1000.
result_nanoseconds = nanoseconds_division_result.remainder.to_double();
// c. Set milliseconds to floor(microseconds / 1000).
auto microseconds_division_result = nanoseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// d. Set microseconds to microseconds modulo 1000.
microseconds = microseconds_division_result.remainder.to_double();
// e. Set seconds to floor(milliseconds / 1000).
auto milliseconds_division_result = microseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// f. Set milliseconds to milliseconds modulo 1000.
milliseconds = milliseconds_division_result.remainder.to_double();
// g. Set minutes to floor(seconds / 60).
auto seconds_division_result = milliseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(60));
// h. Set seconds to seconds modulo 60.
seconds = seconds_division_result.remainder.to_double();
// i. Set hours to floor(minutes / 60).
auto minutes_division_result = seconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(60));
// j. Set minutes to minutes modulo 60.
minutes = minutes_division_result.remainder.to_double();
// k. Set days to floor(hours / 24).
auto hours_division_result = minutes_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(24));
days = hours_division_result.quotient.to_double();
// l. Set hours to hours modulo 24.
hours = hours_division_result.remainder.to_double();
}
// 7. Else if largestUnit is "hour", then
else if (largest_unit == "hour"sv) {
// a. Set microseconds to floor(nanoseconds / 1000).
auto nanoseconds_division_result = total_nanoseconds.divided_by(Crypto::UnsignedBigInteger(1000));
// b. Set nanoseconds to nanoseconds modulo 1000.
result_nanoseconds = nanoseconds_division_result.remainder.to_double();
// c. Set milliseconds to floor(microseconds / 1000).
auto microseconds_division_result = nanoseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// d. Set microseconds to microseconds modulo 1000.
microseconds = microseconds_division_result.remainder.to_double();
// e. Set seconds to floor(milliseconds / 1000).
auto milliseconds_division_result = microseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// f. Set milliseconds to milliseconds modulo 1000.
milliseconds = milliseconds_division_result.remainder.to_double();
// g. Set minutes to floor(seconds / 60).
auto seconds_division_result = milliseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(60));
// h. Set seconds to seconds modulo 60.
seconds = seconds_division_result.remainder.to_double();
// i. Set hours to floor(minutes / 60).
auto minutes_division_result = seconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(60));
hours = minutes_division_result.quotient.to_double();
// j. Set minutes to minutes modulo 60.
minutes = minutes_division_result.remainder.to_double();
}
// 8. Else if largestUnit is "minute", then
else if (largest_unit == "minute"sv) {
// a. Set microseconds to floor(nanoseconds / 1000).
auto nanoseconds_division_result = total_nanoseconds.divided_by(Crypto::UnsignedBigInteger(1000));
// b. Set nanoseconds to nanoseconds modulo 1000.
result_nanoseconds = nanoseconds_division_result.remainder.to_double();
// c. Set milliseconds to floor(microseconds / 1000).
auto microseconds_division_result = nanoseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// d. Set microseconds to microseconds modulo 1000.
microseconds = microseconds_division_result.remainder.to_double();
// e. Set seconds to floor(milliseconds / 1000).
auto milliseconds_division_result = microseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// f. Set milliseconds to milliseconds modulo 1000.
milliseconds = milliseconds_division_result.remainder.to_double();
// g. Set minutes to floor(seconds / 60).
auto seconds_division_result = milliseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(60));
minutes = seconds_division_result.quotient.to_double();
// h. Set seconds to seconds modulo 60.
seconds = seconds_division_result.remainder.to_double();
}
// 9. Else if largestUnit is "second", then
else if (largest_unit == "second"sv) {
// a. Set microseconds to floor(nanoseconds / 1000).
auto nanoseconds_division_result = total_nanoseconds.divided_by(Crypto::UnsignedBigInteger(1000));
// b. Set nanoseconds to nanoseconds modulo 1000.
result_nanoseconds = nanoseconds_division_result.remainder.to_double();
// c. Set milliseconds to floor(microseconds / 1000).
auto microseconds_division_result = nanoseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
// d. Set microseconds to microseconds modulo 1000.
microseconds = microseconds_division_result.remainder.to_double();
// e. Set seconds to floor(milliseconds / 1000).
auto milliseconds_division_result = microseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
seconds = milliseconds_division_result.quotient.to_double();
// f. Set milliseconds to milliseconds modulo 1000.
milliseconds = milliseconds_division_result.remainder.to_double();
}
// 10. Else if largestUnit is "millisecond", then
else if (largest_unit == "millisecond"sv) {
// a. Set microseconds to floor(nanoseconds / 1000).
auto nanoseconds_division_result = total_nanoseconds.divided_by(Crypto::UnsignedBigInteger(1000));
// b. Set nanoseconds to nanoseconds modulo 1000.
result_nanoseconds = nanoseconds_division_result.remainder.to_double();
// c. Set milliseconds to floor(microseconds / 1000).
auto microseconds_division_result = nanoseconds_division_result.quotient.divided_by(Crypto::UnsignedBigInteger(1000));
milliseconds = microseconds_division_result.quotient.to_double();
// d. Set microseconds to microseconds modulo 1000.
microseconds = microseconds_division_result.remainder.to_double();
}
// 11. Else if largestUnit is "microsecond", then
else if (largest_unit == "microsecond"sv) {
// a. Set microseconds to floor(nanoseconds / 1000).
auto nanoseconds_division_result = total_nanoseconds.divided_by(Crypto::UnsignedBigInteger(1000));
microseconds = nanoseconds_division_result.quotient.to_double();
// b. Set nanoseconds to nanoseconds modulo 1000.
result_nanoseconds = nanoseconds_division_result.remainder.to_double();
}
// 12. Else,
else {
// a. Assert: largestUnit is "nanosecond".
VERIFY(largest_unit == "nanosecond"sv);
result_nanoseconds = total_nanoseconds.to_double();
}
// 13. For each value v of « days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds », do
for (double v : { days, hours, minutes, seconds, milliseconds, microseconds, microseconds, result_nanoseconds }) {
// a. If 𝔽(v) is not finite, then
if (!isfinite(v)) {
// i. If sign = 1, then
if (sign == 1) {
// 1. Return positive overflow.
return Overflow::Positive;
}
// ii. Else if sign = -1, then
else {
// 1. Return negative overflow.
return Overflow::Negative;
}
}
}
// 14. Return ! CreateTimeDurationRecord(days × sign, hours × sign, minutes × sign, seconds × sign, milliseconds × sign, microseconds × sign, nanoseconds × sign).
return MUST(create_time_duration_record(vm, days * sign, hours * sign, minutes * sign, seconds * sign, milliseconds * sign, microseconds * sign, result_nanoseconds * sign));
}
// 7.5.19 UnbalanceDurationRelative ( years, months, weeks, days, largestUnit, relativeTo ), https://tc39.es/proposal-temporal/#sec-temporal-unbalancedurationrelative
ThrowCompletionOr<DateDurationRecord> unbalance_duration_relative(VM& vm, double years, double months, double weeks, double days, StringView largest_unit, Value relative_to)
{