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LibJS: Update DifferenceInstant and its callers to latest spec

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This is a bit tangled in that updating these functions involves a slew
of other spec changes.

However those spec updates fix a bunch of rounding issues, fixing 32
test cases.

Diff Tests:
    +32 ✅    -32 ❌
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Shannon Booth 2024-01-10 20:53:23 +13:00 • committed by Andreas Kling
parent c4f37c1bfa
commit 0ed352e44e
4 changed files with 51 additions and 36 deletions
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13
Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
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@ -590,16 +590,11 @@ ThrowCompletionOr<Duration*> difference_temporal_zoned_date_time(VM& vm, Differe
// 5. If settings.[[LargestUnit]] is not one of "year", "month", "week", or "day", then
if (!settings.largest_unit.is_one_of("year"sv, "month"sv, "week"sv, "day"sv)) {
// a. Let differenceNs be ! DifferenceInstant(zonedDateTime.[[Nanoseconds]], other.[[Nanoseconds]], settings.[[RoundingIncrement]], settings.[[SmallestUnit]], settings.[[RoundingMode]]).
auto* difference_ns = difference_instant(vm, zoned_date_time.nanoseconds(), other->nanoseconds(), settings.rounding_increment, settings.smallest_unit, settings.rounding_mode);
// a. Let result be DifferenceInstant(zonedDateTime.[[Nanoseconds]], other.[[Nanoseconds]], settings.[[RoundingIncrement]], settings.[[SmallestUnit]], settings.[[LargestUnit]], settings.[[RoundingMode]]).
auto result = difference_instant(vm, zoned_date_time.nanoseconds(), other->nanoseconds(), settings.rounding_increment, settings.smallest_unit, settings.largest_unit, settings.rounding_mode);
// b. Assert: The following steps cannot fail due to overflow in the Number domain because abs(differenceNs) ≤ 2 × nsMaxInstant.
// c. Let balanceResult be ! BalanceDuration(0, 0, 0, 0, 0, 0, differenceNs, settings.[[LargestUnit]]).
auto balance_result = MUST(balance_duration(vm, 0, 0, 0, 0, 0, 0, difference_ns->big_integer(), settings.largest_unit));
// d. Return ! CreateTemporalDuration(0, 0, 0, 0, sign × balanceResult.[[Hours]], sign × balanceResult.[[Minutes]], sign × balanceResult.[[Seconds]], sign × balanceResult.[[Milliseconds]], sign × balanceResult.[[Microseconds]], sign × balanceResult.[[Nanoseconds]]).
return MUST(create_temporal_duration(vm, 0, 0, 0, 0, sign * balance_result.hours, sign * balance_result.minutes, sign * balance_result.seconds, sign * balance_result.milliseconds, sign * balance_result.microseconds, sign * balance_result.nanoseconds));
// b. Return ! CreateTemporalDuration(0, 0, 0, 0, sign × result.[[Hours]], sign × result.[[Minutes]], sign × result.[[Seconds]], sign × result.[[Milliseconds]], sign × result.[[Microseconds]], sign × result.[[Nanoseconds]]).
return create_temporal_duration(vm, 0, 0, 0, 0, sign * result.hours, sign * result.minutes, sign * result.seconds, sign * result.milliseconds, sign * result.microseconds, sign * result.nanoseconds);
}
// 6. If ? TimeZoneEquals(zonedDateTime.[[TimeZone]], other.[[TimeZone]]) is false, then