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LibWeb/HTML: Implement date conversions for month and week inputs

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This implements the conversion algorithms between strings and dates for
inputs of the types month and week.
This commit is contained in:
Glenn Skrzypczak 2025-08-26 22:03:46 +02:00 • committed by Jelle Raaijmakers
commit bd34b11ca2
Notes: github-actions[bot] 2025-08-27 13:11:23 +00:00
5 changed files with 283 additions and 0 deletions
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48
Libraries/LibWeb/HTML/HTMLInputElement.cpp
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@ -2374,6 +2374,15 @@ static Utf16String convert_number_to_month_string(double input)
return Utf16String::formatted("{:04d}-{:02d}", static_cast<int>(year), static_cast<int>(months) + 1);
}
// https://html.spec.whatwg.org/multipage/input.html#month-state-(type=month):concept-input-value-date-string
static Utf16String convert_date_to_month_string(double input)
{
// The algorithm to convert a number to a string, given a number input, is as follows: Return a valid month
// string that represents the month that has input months between it and January 1970.
auto date = AK::UnixDateTime::from_milliseconds_since_epoch(input);
return date.to_utf16_string("%Y-%m"sv, AK::UnixDateTime::LocalTime::No);
}
// https://html.spec.whatwg.org/multipage/input.html#concept-input-value-number-string
static Utf16String convert_number_to_week_string(double input)
{
@ -2488,6 +2497,31 @@ WebIDL::ExceptionOr<GC::Ptr<JS::Date>> HTMLInputElement::convert_string_to_date(
return JS::Date::create(realm(), JS::make_date(JS::make_day(date.year, date.month - 1, date.day), 0));
}
// https://html.spec.whatwg.org/multipage/input.html#month-state-(type=month):concept-input-value-string-date
if (type_state() == TypeAttributeState::Month) {
// If parsing a month from input results in an error, then return an error;
auto maybe_year_and_month = parse_a_month_string(input);
if (!maybe_year_and_month.has_value())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Can't parse month string"sv };
auto year_and_month = maybe_year_and_month.value();
// otherwise, return a new Date object representing midnight UTC on the morning of the first day of the parsed month.
return JS::Date::create(realm(), JS::make_date(JS::make_day(year_and_month.year, year_and_month.month - 1, 1), 0));
}
// https://html.spec.whatwg.org/multipage/input.html#week-state-(type=week):concept-input-value-string-date
if (type_state() == TypeAttributeState::Week) {
// If parsing a week from input results in an error, then return an error;
auto maybe_week = parse_a_week_string(input);
if (!maybe_week.has_value())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Can't parse week string"sv };
auto week = maybe_week.value();
// otherwise, return a new Date object representing midnight UTC on the morning of the Monday of the parsed week.
auto datetime = UnixDateTime::from_iso8601_week(week.week_year, week.week);
return JS::Date::create(realm(), datetime.milliseconds_since_epoch());
}
// https://html.spec.whatwg.org/multipage/input.html#time-state-(type=time):concept-input-value-string-date
if (type_state() == TypeAttributeState::Time) {
// If parsing a time from input results in an error, then return an error;
@ -2522,6 +2556,20 @@ Utf16String HTMLInputElement::convert_date_to_string(GC::Ref<JS::Date> input) co
return convert_number_to_date_string(input->date_value());
}
// https://html.spec.whatwg.org/multipage/input.html#month-state-(type=month):concept-input-value-date-string
if (type_state() == TypeAttributeState::Month) {
// Return a valid month string that represents the month current at the time represented by input in the UTC time zone.
// https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-month-string
return convert_date_to_month_string(input->date_value());
}
// https://html.spec.whatwg.org/multipage/input.html#week-state-(type=week):concept-input-value-date-string
if (type_state() == TypeAttributeState::Week) {
// Return a valid week string that represents the week current at the time represented by input in the UTC time zone.
// https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-week-string
return convert_number_to_week_string(input->date_value());
}
// https://html.spec.whatwg.org/multipage/input.html#time-state-(type=time):concept-input-value-string-date
if (type_state() == TypeAttributeState::Time) {
// Return a valid time string that represents the UTC time component that is represented by input.