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LibJS: Implement Temporal.Calendar.prototype.dateUntil()

This commit is contained in:
Linus Groh 2021-10-10 22:46:10 +01:00
parent 045c85af4b
commit 99adb54391
6 changed files with 307 additions and 0 deletions

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@ -142,6 +142,191 @@ ThrowCompletionOr<PlainDate*> to_temporal_date(GlobalObject& global_object, Valu
return create_temporal_date(global_object, result.year, result.month, result.day, *calendar);
}
// 3.5.3 DifferenceISODate ( y1, m1, d1, y2, m2, d2, largestUnit ), https://tc39.es/proposal-temporal/#sec-temporal-differenceisodate
DifferenceISODateResult 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
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);
// b. If sign is 0, return the Record { [[Years]]: 0, [[Months]]: 0, [[Weeks]]: 0, [[Days]]: 0 }.
if (sign == 0)
return { .years = 0, .months = 0, .weeks = 0, .days = 0 };
// c. Let start be the Record { [[Year]]: y1, [[Month]]: m1, [[Day]]: d1 }.
auto start = ISODate { .year = year1, .month = month1, .day = day1 };
// d. Let end be the Record { [[Year]]: y2, [[Month]]: m2, [[Day]]: d2 }.
auto end = ISODate { .year = year2, .month = month2, .day = day2 };
// e. Let years be end.[[Year]] start.[[Year]].
double years = end.year - start.year;
// f. Let mid be ! AddISODate(y1, m1, d1, years, 0, 0, 0, "constrain").
auto mid = MUST(add_iso_date(global_object, year1, month1, day1, years, 0, 0, 0, "constrain"sv));
// g. Let midSign be -(! CompareISODate(mid.[[Year]], mid.[[Month]], mid.[[Day]], y2, m2, d2)).
auto mid_sign = -compare_iso_date(mid.year, mid.month, mid.day, year2, month2, day2);
// h. If midSign is 0, then
if (mid_sign == 0) {
// i. If largestUnit is "year", return the Record { [[Years]]: years, [[Months]]: 0, [[Weeks]]: 0, [[Days]]: 0 }.
if (largest_unit == "year"sv)
return { .years = years, .months = 0, .weeks = 0, .days = 0 };
// ii. Return the Record { [[Years]]: 0, [[Months]]: years × 12, [[Weeks]]: 0, [[Days]]: 0 }.
return { .years = 0, .months = years * 12, .weeks = 0, .days = 0 };
}
// i. Let months be end.[[Month]] start.[[Month]].
double months = end.month - start.month;
// j. If midSign is not equal to sign, then
if (mid_sign != sign) {
// i. Set years to years - sign.
years -= sign;
// ii. Set months to months + sign × 12.
months += sign * 12;
}
// k. Set mid to ! AddISODate(y1, m1, d1, years, months, 0, 0, "constrain").
mid = MUST(add_iso_date(global_object, year1, month1, day1, years, months, 0, 0, "constrain"sv));
// l. Set midSign to -(! CompareISODate(mid.[[Year]], mid.[[Month]], mid.[[Day]], y2, m2, d2)).
mid_sign = -compare_iso_date(mid.year, mid.month, mid.day, year2, month2, day2);
// m. If midSign is 0, then
if (mid_sign == 0) {
// i. If largestUnit is "year", return the Record { [[Years]]: years, [[Months]]: months, [[Weeks]]: 0, [[Days]]: 0 }.
if (largest_unit == "year"sv)
return { .years = years, .months = months, .weeks = 0, .days = 0 };
// ii. Return the Record { [[Years]]: 0, [[Months]]: months + years × 12, [[Weeks]]: 0, [[Days]]: 0 }.
return { .years = 0, .months = months + years * 12, .weeks = 0, .days = 0 };
}
// n. If midSign is not equal to sign, then
if (mid_sign != sign) {
// i. Set months to months - sign.
months -= sign;
// ii. If months is equal to -sign, then
if (months == -sign) {
// 1. Set years to years - sign.
years -= sign;
// 2. Set months to 11 × sign.
months = 11 * sign;
}
// iii. Set mid to ! AddISODate(y1, m1, d1, years, months, 0, 0, "constrain").
mid = MUST(add_iso_date(global_object, year1, month1, day1, years, months, 0, 0, "constrain"sv));
// FIXME: This is not used (spec issue, see https://github.com/tc39/proposal-temporal/issues/1483).
// iv. Set midSign to -(! CompareISODate(mid.[[Year]], mid.[[Month]], mid.[[Day]], y2, m2, d2)).
mid_sign = -compare_iso_date(mid.year, mid.month, mid.day, year2, month2, day2);
}
// o. Let days be 0.
double days = 0;
// p. If mid.[[Month]] = end.[[Month]], then
if (mid.month == end.month) {
// i. Assert: mid.[[Year]] = end.[[Year]].
VERIFY(mid.year == end.year);
// ii. Set days to end.[[Day]] - mid.[[Day]].
days = end.day - mid.day;
}
// q. Else if sign < 0, set days to -mid.[[Day]] - (! ISODaysInMonth(end.[[Year]], end.[[Month]]) - end.[[Day]]).
else if (sign < 0) {
days = -mid.day - (iso_days_in_month(end.year, end.month) - end.day);
}
// r. Else, set days to end.[[Day]] + (! ISODaysInMonth(mid.[[Year]], mid.[[Month]]) - mid.[[Day]]).
else {
days = end.day + (iso_days_in_month(mid.year, mid.month) - mid.day);
}
// s. If largestUnit is "month", then
if (largest_unit == "month"sv) {
// i. Set months to months + years × 12.
months += years * 12;
// ii. Set years to 0.
years = 0;
}
// t. Return the Record { [[Years]]: years, [[Months]]: months, [[Weeks]]: 0, [[Days]]: days }.
return { .years = years, .months = months, .weeks = 0, .days = days };
}
// 3. If largestUnit is "day" or "week", then
else {
ISODate smaller;
ISODate greater;
i8 sign;
// 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 };
// ii. Let greater be the Record { [[Year]]: y2, [[Month]]: m2, [[Day]]: d2 }.
greater = { .year = year2, .month = month2, .day = 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 };
// 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++;
}
// 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);
// ii. Set days to days modulo 7.
days = fmod(days, 7);
}
// h. Return the Record { [[Years]]: 0, [[Months]]: 0, [[Weeks]]: weeks × sign, [[Days]]: days × sign }.
// NOTE: We set weeks and days conditionally to avoid negative zero for 0 * -1.
return { .years = 0, .months = 0, .weeks = (weeks != 0) ? weeks * sign : 0, .days = (days != 0) ? days * sign : 0 };
}
VERIFY_NOT_REACHED();
}
// 3.5.4 RegulateISODate ( year, month, day, overflow ), https://tc39.es/proposal-temporal/#sec-temporal-regulateisodate
ThrowCompletionOr<ISODate> regulate_iso_date(GlobalObject& global_object, double year, double month, double day, StringView overflow)
{