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LibJS: Implement Temporal.Calendar.prototype.weekOfYear

This commit is contained in:
Idan Horowitz 2021-07-23 18:19:45 +03:00 committed by Linus Groh
parent d561535ac9
commit d22fe25643
6 changed files with 81 additions and 0 deletions

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@ -382,6 +382,21 @@ bool is_iso_leap_year(i32 year)
return true;
}
// 12.1.31 ISODaysInYear ( year ), https://tc39.es/proposal-temporal/#sec-temporal-isodaysinyear
u16 iso_days_in_year(i32 year)
{
// 1. Assert: year is an integer.
// 2. If ! IsISOLeapYear(year) is true, then
if (is_iso_leap_year(year)) {
// a. Return 366.
return 366;
}
// 3. Return 365.
return 365;
}
// 12.1.32 ISODaysInMonth ( year, month ), https://tc39.es/proposal-temporal/#sec-temporal-isodaysinmonth
i32 iso_days_in_month(i32 year, i32 month)
{
@ -441,6 +456,34 @@ u16 to_iso_day_of_year(i32 year, u8 month, u8 day)
return days;
}
// 12.1.35 ToISOWeekOfYear ( year, month, day ), https://tc39.es/proposal-temporal/#sec-temporal-toisoweekofyear
u8 to_iso_week_of_year(i32 year, u8 month, u8 day)
{
// 1. Assert: year is an integer.
// 2. Assert: month is an integer.
// 3. Assert: day is an integer.
// 4. Let date be the date given by year, month, and day.
// 5. Return date's week number according to ISO-8601.
auto day_of_year = to_iso_day_of_year(year, month, day);
auto day_of_week = to_iso_day_of_week(year, month, day);
auto week = (day_of_year - day_of_week + 10) / 7;
if (week < 1) {
auto day_of_jump = to_iso_day_of_week(year, 1, 1);
if (day_of_jump == 5 || (is_iso_leap_year(year) && day_of_jump == 6))
return 53;
else
return 52;
} else if (week == 53) {
auto days_in_year = iso_days_in_year(year);
if (days_in_year - day_of_year < 4 - day_of_week)
return 1;
}
return week;
}
// 12.1.36 BuildISOMonthCode ( month ), https://tc39.es/proposal-temporal/#sec-buildisomonthcode
String build_iso_month_code(i32 month)
{