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LibJS: Implement Temporal.PlainMonthDay.prototype.toString()

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Linus Groh 2021-08-19 08:39:34 +01:00
parent c1c8d7861c
commit ea44f33d5b
5 changed files with 101 additions and 0 deletions
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34
Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp
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@ -6,6 +6,7 @@
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Temporal/Calendar.h>
#include <LibJS/Runtime/Temporal/PlainDate.h>
#include <LibJS/Runtime/Temporal/PlainMonthDay.h>
#include <LibJS/Runtime/Temporal/PlainMonthDayConstructor.h>
@ -59,4 +60,37 @@ PlainMonthDay* create_temporal_month_day(GlobalObject& global_object, u8 iso_mon
return object;
}
// 10.5.3 TemporalMonthDayToString ( monthDay, showCalendar ), https://tc39.es/proposal-temporal/#sec-temporal-temporalmonthdaytostring
Optional<String> temporal_month_day_to_string(GlobalObject& global_object, PlainMonthDay& month_day, StringView show_calendar)
{
auto& vm = global_object.vm();
// 1. Assert: Type(monthDay) is Object.
// 2. Assert: monthDay has an [[InitializedTemporalMonthDay]] internal slot.
// 3. Let month be monthDay.[[ISOMonth]] formatted as a two-digit decimal number, padded to the left with a zero if necessary.
// 4. Let day be monthDay.[[ISODay]] formatted as a two-digit decimal number, padded to the left with a zero if necessary.
// 5. Let result be the string-concatenation of month, the code unit 0x002D (HYPHEN-MINUS), and day.
auto result = String::formatted("{:02}-{:02}", month_day.iso_month(), month_day.iso_day());
// 6. Let calendarID be ? ToString(monthDay.[[Calendar]]).
auto calendar_id = Value(&month_day.calendar()).to_string(global_object);
if (vm.exception())
return {};
// 7. If calendarID is not "iso8601", then
if (calendar_id != "iso8601"sv) {
// a. Let year be ! PadISOYear(monthDay.[[ISOYear]]).
// b. Set result to the string-concatenation of year, the code unit 0x002D (HYPHEN-MINUS), and result.
result = String::formatted("{}-{}", pad_iso_year(month_day.iso_year()), result);
}
// 8. Let calendarString be ! FormatCalendarAnnotation(calendarID, showCalendar).
auto calendar_string = format_calendar_annotation(calendar_id, show_calendar);
// 9. Set result to the string-concatenation of result and calendarString.
// 10. Return result.
return String::formatted("{}{}", result, calendar_string);
}
}