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LibJS+LibUnicode: Generate a set of default DateTimeFormat patterns

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This isn't called out in TR-35, but before ICU even looks at CLDR data,
it adds a hard-coded set of default patterns to each locale's calendar.
It has done this since 2006 when its DateTimeFormat feature was first
created. Several test262 tests depend on this, which under ECMA-402,
falls into "implementation defined" behavior. For compatibility, we
can do the same in LibUnicode.
This commit is contained in:
Timothy Flynn
2022-07-22 18:00:06 -04:00
committed by Linus Groh
parent 8150d71821
commit ae2acc8cdf
Notes: sideshowbarker 2024-07-17 08:38:23 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/ae2acc8cdf
Pull-request: https://github.com/SerenityOS/serenity/pull/14655
Reviewed-by: https://github.com/linusg ✅
3 changed files with 56 additions and 2 deletions
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2
Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
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@@ -431,7 +431,7 @@ Optional<Unicode::CalendarPattern> basic_format_matcher(Unicode::CalendarPattern
best_format->for_each_calendar_field_zipped_with(options, [&](auto& best_format_field, auto const& option_field, auto field_type) {
switch (field_type) {
case Unicode::CalendarPattern::Field::FractionalSecondDigits:
if (best_format->second.has_value() && option_field.has_value())
if ((best_format_field.has_value() || best_format->second.has_value()) && option_field.has_value())
best_format_field = option_field;
break;