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LibJS+LibUnicode: Handle flexible day periods that roll over midnight

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When searching for the locale-specific flexible day period for a given
hour, we were neglecting to handle cases where the period crosses 00:00.
For example, the en locale defines a day period range of [21:00, 06:00).
When given the hour of 05:00, we were checking if (21 <= 5 && 5 < 6),
thus not recognizing that the hour falls in that period.
This commit is contained in:
Timothy Flynn 2022-01-05 08:24:02 -05:00 committed by Linus Groh
parent c8addf1a5e
commit ec7d5351ed
Notes: sideshowbarker 2024-07-18 00:34:07 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/ec7d5351ed0
Pull-request: https://github.com/SerenityOS/serenity/pull/11640
2 changed files with 16 additions and 2 deletions
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10
Meta/Lagom/Tools/CodeGenerators/LibUnicode/GenerateUnicodeDateTimeFormat.cpp
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@ -2043,9 +2043,15 @@ Optional<StringView> get_calendar_day_period_symbol_for_hour(StringView locale,
auto day_periods = s_day_period_lists[day_periods_index];
for (auto day_period_index : day_periods) {
auto const& day_period = s_day_periods[day_period_index];
auto day_period = s_day_periods[day_period_index];
auto h = hour;
if ((day_period.begin <= hour) && (hour < day_period.end)) {
if (day_period.begin > day_period.end) {
day_period.end += 24;
h += 24;
}
if ((day_period.begin <= h) && (h < day_period.end)) {
auto period = static_cast<DayPeriod>(day_period.day_period);
return get_calendar_day_period_symbol(locale, calendar, style, period);
}

8
Userland/Libraries/LibJS/Tests/builtins/Intl/DateTimeFormat/DateTimeFormat.prototype.format.js
View File

@ -261,6 +261,14 @@ describe("dayPeriod", () => {
expect(as.format(d1)).toBe(d.as1);
});
});
test("flexible day period rolls over midnight", () => {
// For the en locale, this time (05:00) falls in the flexible day period range of [21:00, 06:00).
const date = Date.UTC(2017, 11, 12, 5, 0, 0, 0);
const en = new Intl.DateTimeFormat("en", { dayPeriod: "short", timeZone: "UTC" });
expect(en.format(date)).toBe("5 at night");
});
});
describe("hour", () => {