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LibUnicode: Implement TR-35's localized GMT offset formatting

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This adds an API to use LibTimeZone to convert a time zone such as
"America/New_York" to a GMT offset string like "GMT-5" (short form) or
"GMT-05:00" (long form).
This commit is contained in:
Timothy Flynn 2022-01-11 11:35:50 -05:00 • committed by Linus Groh
parent 6409900a5b
commit 8d35563f28
5 changed files with 238 additions and 20 deletions
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14
Userland/Libraries/LibUnicode/DateTimeFormat.h
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@ -9,6 +9,7 @@
#include <AK/Optional.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Time.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibUnicode/Forward.h>
@ -167,6 +168,17 @@ enum class CalendarSymbol : u8 {
Weekday,
};
struct TimeZoneFormat {
StringView symbol_ahead_sign {};
StringView symbol_ahead_separator {};
StringView symbol_behind_sign {};
StringView symbol_behind_separator {};
StringView gmt_format {};
StringView gmt_zero_format {};
};
HourCycle hour_cycle_from_string(StringView hour_cycle);
StringView hour_cycle_to_string(HourCycle hour_cycle);
@ -197,6 +209,8 @@ Optional<StringView> get_calendar_weekday_symbol(StringView locale, StringView c
Optional<StringView> get_calendar_day_period_symbol(StringView locale, StringView calendar, CalendarPatternStyle style, Unicode::DayPeriod value);
Optional<StringView> get_calendar_day_period_symbol_for_hour(StringView locale, StringView calendar, CalendarPatternStyle style, u8 hour);
String format_time_zone(StringView locale, StringView time_zone, CalendarPatternStyle style, AK::Time time);
Optional<StringView> get_time_zone_name(StringView locale, StringView time_zone, CalendarPatternStyle style);
Optional<TimeZoneFormat> get_time_zone_format(StringView locale);
}