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LibUnicode: Parse and generate regional hour cycles

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Unlike most data in the CLDR, hour cycles are not stored on a per-locale
basis. Instead, they are keyed by a string that is usually a region, but
sometimes is a locale. Therefore, given a locale, to determine the hour
cycles for that locale, we:

    1. Check if the locale itself is assigned hour cycles.
    2. If the locale has a region, check if that region is assigned hour
       cycles.
    3. Otherwise, maximize that locale, and if the maximized locale has
       a region, check if that region is assigned hour cycles.
    4. If the above all fail, fallback to the "001" region.

Further, each locale's default hour cycle is the first assigned hour
cycle.
This commit is contained in:
Timothy Flynn 2021-11-27 20:57:21 -05:00 • committed by Linus Groh
parent 15fc03ef34
commit 48ce72e472
5 changed files with 183 additions and 7 deletions
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68
Userland/Libraries/LibUnicode/DateTimeFormat.cpp
View file

@ -5,6 +5,7 @@
*/
#include <LibUnicode/DateTimeFormat.h>
#include <LibUnicode/Locale.h>
#if ENABLE_UNICODE_DATA
# include <LibUnicode/UnicodeDateTimeFormat.h>
@ -12,6 +13,35 @@
namespace Unicode {
HourCycle hour_cycle_from_string(StringView hour_cycle)
{
if (hour_cycle == "h11"sv)
return Unicode::HourCycle::H11;
else if (hour_cycle == "h12"sv)
return Unicode::HourCycle::H12;
else if (hour_cycle == "h23"sv)
return Unicode::HourCycle::H23;
else if (hour_cycle == "h24"sv)
return Unicode::HourCycle::H24;
VERIFY_NOT_REACHED();
}
StringView hour_cycle_to_string(HourCycle hour_cycle)
{
switch (hour_cycle) {
case HourCycle::H11:
return "h11"sv;
case HourCycle::H12:
return "h12"sv;
case HourCycle::H23:
return "h23"sv;
case HourCycle::H24:
return "h24"sv;
default:
VERIFY_NOT_REACHED();
}
}
CalendarPatternStyle calendar_pattern_style_from_string(StringView style)
{
if (style == "narrow"sv)
@ -45,6 +75,44 @@ StringView calendar_pattern_style_to_string(CalendarPatternStyle style)
}
}
// https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table
Vector<Unicode::HourCycle> get_regional_hour_cycles([[maybe_unused]] StringView locale)
{
#if ENABLE_UNICODE_DATA
if (auto hour_cycles = Detail::get_regional_hour_cycles(locale); !hour_cycles.is_empty())
return hour_cycles;
auto return_default_hour_cycles = []() {
auto hour_cycles = Detail::get_regional_hour_cycles("001"sv);
VERIFY(!hour_cycles.is_empty());
return hour_cycles;
};
auto language = parse_unicode_language_id(locale);
if (!language.has_value())
return return_default_hour_cycles();
if (!language->region.has_value())
language = add_likely_subtags(*language);
if (!language.has_value() || !language->region.has_value())
return return_default_hour_cycles();
if (auto hour_cycles = Detail::get_regional_hour_cycles(*language->region); !hour_cycles.is_empty())
return hour_cycles;
return return_default_hour_cycles();
#else
return {};
#endif
}
Optional<Unicode::HourCycle> get_default_regional_hour_cycle(StringView locale)
{
if (auto hour_cycles = get_regional_hour_cycles(locale); !hour_cycles.is_empty())
return hour_cycles.first();
return {};
}
Optional<CalendarFormat> get_calendar_format([[maybe_unused]] StringView locale, [[maybe_unused]] StringView calendar, [[maybe_unused]] CalendarFormatType type)
{
#if ENABLE_UNICODE_DATA