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LibJS+LibUnicode: Handle flexible day periods on both sides of midnight

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Commit ec7d535 only partially handled the case of flexible day periods
rolling over midnight, in that it only worked for hours after midnight.
For example, the en locale defines a day period range of [21:00, 06:00).
The previous method of adding 24 hours to the given hour would change
e.g. 23:00 to 47:00, which isn't valid.
This commit is contained in:
Timothy Flynn
2022-07-21 11:28:59 -04:00
committed by Linus Groh
parent fadd69263a
commit 0f26ab89ae
Notes: sideshowbarker 2024-07-17 08:43:11 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/0f26ab89ae
Pull-request: https://github.com/SerenityOS/serenity/pull/14637
Reviewed-by: https://github.com/linusg ✅
2 changed files with 16 additions and 8 deletions
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12
Meta/Lagom/Tools/CodeGenerators/LibUnicode/GenerateUnicodeDateTimeFormat.cpp
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@@ -2289,14 +2289,18 @@ Optional<StringView> get_calendar_day_period_symbol_for_hour(StringView locale,
for (auto day_period_index : day_periods) {
auto day_period = s_day_periods[day_period_index];
auto h = hour;
bool hour_falls_within_day_period = false;
if (day_period.begin > day_period.end) {
day_period.end += 24;
h += 24;
if (hour >= day_period.begin)
hour_falls_within_day_period = true;
else if (hour <= day_period.end)
hour_falls_within_day_period = true;
} else if ((day_period.begin <= hour) && (hour < day_period.end)) {
hour_falls_within_day_period = true;
}
if ((day_period.begin <= h) && (h < day_period.end)) {
if (hour_falls_within_day_period) {
auto period = static_cast<DayPeriod>(day_period.day_period);
return get_calendar_day_period_symbol(locale, calendar, style, period);
}