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LibUnicode: Add method to combine two format pattern skeletons

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The fields of the generated elements must be in the same order as the
table here:
https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table

Further, only one field from each group of fields is allowed.
This commit is contained in:
Timothy Flynn 2021-12-08 19:52:48 -05:00 committed by Linus Groh
parent 9d4c4303fd
commit 2024d9e9ea
Notes: sideshowbarker 2024-07-17 23:01:57 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/2024d9e9ea8
Pull-request: https://github.com/SerenityOS/serenity/pull/11199
Reviewed-by: https://github.com/linusg ✅
2 changed files with 44 additions and 0 deletions
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43
Userland/Libraries/LibUnicode/DateTimeFormat.cpp
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@ -4,6 +4,8 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/StringBuilder.h>
#include <LibUnicode/DateTimeFormat.h>
#include <LibUnicode/Locale.h>
@ -113,6 +115,47 @@ Optional<Unicode::HourCycle> get_default_regional_hour_cycle(StringView locale)
return {};
}
String combine_skeletons(StringView first, StringView second)
{
// https://unicode.org/reports/tr35/tr35-dates.html#availableFormats_appendItems
constexpr auto field_order = Array {
"G"sv, // Era
"yYuUr"sv, // Year
"ML"sv, // Month
"dDFg"sv, // Day
"Eec"sv, // Weekday
"abB"sv, // Period
"hHKk"sv, // Hour
"m"sv, // Minute
"sSA"sv, // Second
"zZOvVXx"sv, // Zone
};
StringBuilder builder;
auto append_from_skeleton = [&](auto skeleton, auto ch) {
auto first_index = skeleton.find(ch);
if (!first_index.has_value())
return false;
auto last_index = skeleton.find_last(ch);
builder.append(skeleton.substring_view(*first_index, *last_index - *first_index + 1));
return true;
};
for (auto fields : field_order) {
for (auto ch : fields) {
if (append_from_skeleton(first, ch))
break;
if (append_from_skeleton(second, ch))
break;
}
}
return builder.build();
}
Optional<CalendarFormat> get_calendar_format([[maybe_unused]] StringView locale, [[maybe_unused]] StringView calendar, [[maybe_unused]] CalendarFormatType type)
{
#if ENABLE_UNICODE_DATA

1
Userland/Libraries/LibUnicode/DateTimeFormat.h
View file

@ -157,6 +157,7 @@ CalendarPatternStyle calendar_pattern_style_from_string(StringView style);
StringView calendar_pattern_style_to_string(CalendarPatternStyle style);
Vector<Unicode::HourCycle> get_regional_hour_cycles(StringView locale);
Optional<Unicode::HourCycle> get_default_regional_hour_cycle(StringView locale);
String combine_skeletons(StringView first, StringView second);
Optional<CalendarFormat> get_calendar_format(StringView locale, StringView calendar, CalendarFormatType type);
Vector<CalendarPattern> get_calendar_available_formats(StringView locale, StringView calendar);
Optional<Unicode::CalendarRangePattern> get_calendar_default_range_format(StringView locale, StringView calendar);