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LibJS: Simplify DifferenceISODate

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This is an editorial change in the Temporal spec.

See: 76452d2
This commit is contained in:
Linus Groh 2022-05-06 23:40:50 +02:00
parent 6a2b73a4a9
commit ade7946217
2 changed files with 18 additions and 47 deletions
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63
Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
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@ -142,10 +142,9 @@ ThrowCompletionOr<PlainDate*> to_temporal_date(GlobalObject& global_object, Valu
// 3.5.3 DifferenceISODate ( y1, m1, d1, y2, m2, d2, largestUnit ), https://tc39.es/proposal-temporal/#sec-temporal-differenceisodate
DateDurationRecord difference_iso_date(GlobalObject& global_object, i32 year1, u8 month1, u8 day1, i32 year2, u8 month2, u8 day2, StringView largest_unit)
{
// 1. Assert: largestUnit is one of "year", "month", "week", or "day".
VERIFY(largest_unit.is_one_of("year"sv, "month"sv, "week"sv, "day"sv));
// 2. If largestUnit is "year" or "month", then
// 1. If largestUnit is "year" or "month", then
if (largest_unit.is_one_of("year"sv, "month"sv)) {
// a. Let sign be -(! CompareISODate(y1, m1, d1, y2, m2, d2)).
auto sign = -compare_iso_date(year1, month1, day1, year2, month2, day2);
@ -257,65 +256,37 @@ DateDurationRecord difference_iso_date(GlobalObject& global_object, i32 year1, u
// t. Return ! CreateDateDurationRecord(years, months, 0, days).
return create_date_duration_record(years, months, 0, days);
}
// 3. If largestUnit is "day" or "week", then
// 2. If largestUnit is "day" or "week", then
else {
ISODate smaller;
ISODate greater;
i8 sign;
// a. Let epochDays1 be MakeDay(𝔽(y1), 𝔽(m1 - 1), 𝔽(d1)).
auto epoch_days_1 = make_day(year1, month1 - 1, day1);
// a. If ! CompareISODate(y1, m1, d1, y2, m2, d2) < 0, then
if (compare_iso_date(year1, month1, day1, year2, month2, day2) < 0) {
// i. Let smaller be the Record { [[Year]]: y1, [[Month]]: m1, [[Day]]: d1 }.
smaller = { .year = year1, .month = month1, .day = day1 };
// b. Assert: epochDays1 is finite.
VERIFY(isfinite(epoch_days_1));
// ii. Let greater be the Record { [[Year]]: y2, [[Month]]: m2, [[Day]]: d2 }.
greater = { .year = year2, .month = month2, .day = day2 };
// c. Let epochDays2 be MakeDay(𝔽(y2), 𝔽(m2 - 1), 𝔽(d2)).
auto epoch_days_2 = make_day(year2, month2 - 1, day2);
// iii. Let sign be 1.
sign = 1;
}
// b. Else,
else {
// i. Let smaller be the Record { [[Year]]: y2, [[Month]]: m2, [[Day]]: d2 }.
smaller = { .year = year2, .month = month2, .day = day2 };
// d. Assert: epochDays2 is finite.
VERIFY(isfinite(epoch_days_2));
// ii. Let greater be the Record { [[Year]]: y1, [[Month]]: m1, [[Day]]: d1 }.
greater = { .year = year1, .month = month1, .day = day1 };
// iii. Let sign be -1.
sign = -1;
}
// c. Let days be ! ToISODayOfYear(greater.[[Year]], greater.[[Month]], greater.[[Day]]) - ! ToISODayOfYear(smaller.[[Year]], smaller.[[Month]], smaller.[[Day]]).
double days = to_iso_day_of_year(greater.year, greater.month, greater.day) - to_iso_day_of_year(smaller.year, smaller.month, smaller.day);
// d. Let year be smaller.[[Year]].
auto year = smaller.year;
// e. Repeat, while year < greater.[[Year]],
while (year < greater.year) {
// i. Set days to days + ! ISODaysInYear(year).
days += iso_days_in_year(year);
// ii. Set year to year + 1.
year++;
}
// e. Let days be ℝ(epochDays2) - ℝ(epochDays1).
auto days = epoch_days_2 - epoch_days_1;
// f. Let weeks be 0.
double weeks = 0;
// g. If largestUnit is "week", then
if (largest_unit == "week"sv) {
// i. Set weeks to floor(days / 7).
weeks = floor(days / 7);
// i. Set weeks to RoundTowardsZero(days / 7).
weeks = trunc(days / 7);
// ii. Set days to days modulo 7.
// ii. Set days to remainder(days, 7).
days = fmod(days, 7);
}
// h. Return ! CreateDateDurationRecord(0, 0, weeks × sign, days × sign).
// NOTE: We set weeks and days conditionally to avoid negative zero for 0 * -1.
return create_date_duration_record(0, 0, (weeks != 0) ? weeks * sign : 0, (days != 0) ? days * sign : 0);
// h. Return ! CreateDateDurationRecord(0, 0, weeks, days).
return create_date_duration_record(0, 0, weeks, days);
}
VERIFY_NOT_REACHED();
}