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12e7c0808a
This includes: * The minimum number of days in a week for that week to count as the first week of a new year. * The day to be shown as the first day of the week in a calendar. * The start/end days of the weekend. Like the existing hour cycle data, week data is presented per-region in the CLDR, rather than per-locale. The method to add likely subtags to a locale to perform region lookups is the same. The list of regions in the CLDR for hour cycle, minimum days, first day, and weekend days are quite different. So rather than changing the existing HourCycleRegion enum to a generic Region enum, we generate separate enums for each of the week data fields. This allows each lookup into these fields to remain simple array-based index access, without any "jumps" for regions that don't have CLDR data for a field.
337 lines
12 KiB
C++
337 lines
12 KiB
C++
/*
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* Copyright (c) 2021-2022, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Array.h>
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#include <AK/StringBuilder.h>
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#include <LibUnicode/DateTimeFormat.h>
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#include <LibUnicode/Locale.h>
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#include <LibUnicode/NumberFormat.h>
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#include <stdlib.h>
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namespace Unicode {
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HourCycle hour_cycle_from_string(StringView hour_cycle)
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{
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if (hour_cycle == "h11"sv)
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return Unicode::HourCycle::H11;
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else if (hour_cycle == "h12"sv)
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return Unicode::HourCycle::H12;
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else if (hour_cycle == "h23"sv)
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return Unicode::HourCycle::H23;
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else if (hour_cycle == "h24"sv)
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return Unicode::HourCycle::H24;
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VERIFY_NOT_REACHED();
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}
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StringView hour_cycle_to_string(HourCycle hour_cycle)
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{
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switch (hour_cycle) {
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case HourCycle::H11:
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return "h11"sv;
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case HourCycle::H12:
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return "h12"sv;
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case HourCycle::H23:
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return "h23"sv;
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case HourCycle::H24:
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return "h24"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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CalendarPatternStyle calendar_pattern_style_from_string(StringView style)
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{
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if (style == "narrow"sv)
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return CalendarPatternStyle::Narrow;
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if (style == "short"sv)
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return CalendarPatternStyle::Short;
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if (style == "long"sv)
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return CalendarPatternStyle::Long;
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if (style == "numeric"sv)
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return CalendarPatternStyle::Numeric;
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if (style == "2-digit"sv)
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return CalendarPatternStyle::TwoDigit;
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if (style == "shortOffset"sv)
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return CalendarPatternStyle::ShortOffset;
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if (style == "longOffset"sv)
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return CalendarPatternStyle::LongOffset;
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if (style == "shortGeneric"sv)
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return CalendarPatternStyle::ShortGeneric;
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if (style == "longGeneric"sv)
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return CalendarPatternStyle::LongGeneric;
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VERIFY_NOT_REACHED();
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}
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StringView calendar_pattern_style_to_string(CalendarPatternStyle style)
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{
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switch (style) {
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case CalendarPatternStyle::Narrow:
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return "narrow"sv;
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case CalendarPatternStyle::Short:
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return "short"sv;
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case CalendarPatternStyle::Long:
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return "long"sv;
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case CalendarPatternStyle::Numeric:
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return "numeric"sv;
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case CalendarPatternStyle::TwoDigit:
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return "2-digit"sv;
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case CalendarPatternStyle::ShortOffset:
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return "shortOffset"sv;
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case CalendarPatternStyle::LongOffset:
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return "longOffset"sv;
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case CalendarPatternStyle::ShortGeneric:
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return "shortGeneric"sv;
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case CalendarPatternStyle::LongGeneric:
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return "longGeneric"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Optional<HourCycleRegion> __attribute__((weak)) hour_cycle_region_from_string(StringView) { return {}; }
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Vector<HourCycle> __attribute__((weak)) get_regional_hour_cycles(StringView) { return {}; }
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template<typename GetRegionalValues>
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static auto find_regional_values_for_locale(StringView locale, GetRegionalValues&& get_regional_values)
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{
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auto has_value = [](auto const& container) {
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if constexpr (requires { container.has_value(); })
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return container.has_value();
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else
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return !container.is_empty();
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};
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if (auto regional_values = get_regional_values(locale); has_value(regional_values))
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return regional_values;
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auto return_default_values = [&]() { return get_regional_values("001"sv); };
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auto language = parse_unicode_language_id(locale);
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if (!language.has_value())
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return return_default_values();
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if (!language->region.has_value())
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language = add_likely_subtags(*language);
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if (!language.has_value() || !language->region.has_value())
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return return_default_values();
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if (auto regional_values = get_regional_values(*language->region); has_value(regional_values))
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return regional_values;
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return return_default_values();
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}
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// https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table
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Vector<Unicode::HourCycle> get_locale_hour_cycles(StringView locale)
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{
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return find_regional_values_for_locale(locale, get_regional_hour_cycles);
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}
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Optional<Unicode::HourCycle> get_default_regional_hour_cycle(StringView locale)
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{
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if (auto hour_cycles = get_locale_hour_cycles(locale); !hour_cycles.is_empty())
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return hour_cycles.first();
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return {};
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}
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Optional<MinimumDaysRegion> __attribute__((weak)) minimum_days_region_from_string(StringView) { return {}; }
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Optional<u8> __attribute__((weak)) get_regional_minimum_days(StringView) { return {}; }
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Optional<u8> get_locale_minimum_days(StringView locale)
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{
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return find_regional_values_for_locale(locale, get_regional_minimum_days);
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}
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Optional<FirstDayRegion> __attribute__((weak)) first_day_region_from_string(StringView) { return {}; }
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Optional<Weekday> __attribute__((weak)) get_regional_first_day(StringView) { return {}; }
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Optional<Weekday> get_locale_first_day(StringView locale)
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{
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return find_regional_values_for_locale(locale, get_regional_first_day);
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}
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Optional<WeekendStartRegion> __attribute__((weak)) weekend_start_region_from_string(StringView) { return {}; }
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Optional<Weekday> __attribute__((weak)) get_regional_weekend_start(StringView) { return {}; }
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Optional<Weekday> get_locale_weekend_start(StringView locale)
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{
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return find_regional_values_for_locale(locale, get_regional_weekend_start);
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}
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Optional<WeekendEndRegion> __attribute__((weak)) weekend_end_region_from_string(StringView) { return {}; }
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Optional<Weekday> __attribute__((weak)) get_regional_weekend_end(StringView) { return {}; }
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Optional<Weekday> get_locale_weekend_end(StringView locale)
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{
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return find_regional_values_for_locale(locale, get_regional_weekend_end);
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}
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String combine_skeletons(StringView first, StringView second)
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{
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// https://unicode.org/reports/tr35/tr35-dates.html#availableFormats_appendItems
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constexpr auto field_order = Array {
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"G"sv, // Era
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"yYuUr"sv, // Year
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"ML"sv, // Month
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"dDFg"sv, // Day
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"Eec"sv, // Weekday
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"abB"sv, // Period
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"hHKk"sv, // Hour
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"m"sv, // Minute
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"sSA"sv, // Second
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"zZOvVXx"sv, // Zone
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};
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StringBuilder builder;
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auto append_from_skeleton = [&](auto skeleton, auto ch) {
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auto first_index = skeleton.find(ch);
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if (!first_index.has_value())
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return false;
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auto last_index = skeleton.find_last(ch);
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builder.append(skeleton.substring_view(*first_index, *last_index - *first_index + 1));
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return true;
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};
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for (auto fields : field_order) {
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for (auto ch : fields) {
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if (append_from_skeleton(first, ch))
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break;
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if (append_from_skeleton(second, ch))
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break;
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}
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}
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return builder.build();
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}
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Optional<CalendarFormat> __attribute__((weak)) get_calendar_date_format(StringView, StringView) { return {}; }
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Optional<CalendarFormat> __attribute__((weak)) get_calendar_time_format(StringView, StringView) { return {}; }
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Optional<CalendarFormat> __attribute__((weak)) get_calendar_date_time_format(StringView, StringView) { return {}; }
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Optional<CalendarFormat> get_calendar_format(StringView locale, StringView calendar, CalendarFormatType type)
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{
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switch (type) {
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case CalendarFormatType::Date:
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return get_calendar_date_format(locale, calendar);
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case CalendarFormatType::Time:
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return get_calendar_time_format(locale, calendar);
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case CalendarFormatType::DateTime:
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return get_calendar_date_time_format(locale, calendar);
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Vector<CalendarPattern> __attribute__((weak)) get_calendar_available_formats(StringView, StringView) { return {}; }
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Optional<CalendarRangePattern> __attribute__((weak)) get_calendar_default_range_format(StringView, StringView) { return {}; }
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Vector<CalendarRangePattern> __attribute__((weak)) get_calendar_range_formats(StringView, StringView, StringView) { return {}; }
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Vector<CalendarRangePattern> __attribute__((weak)) get_calendar_range12_formats(StringView, StringView, StringView) { return {}; }
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Optional<StringView> __attribute__((weak)) get_calendar_era_symbol(StringView, StringView, CalendarPatternStyle, Era) { return {}; }
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Optional<StringView> __attribute__((weak)) get_calendar_month_symbol(StringView, StringView, CalendarPatternStyle, Month) { return {}; }
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Optional<StringView> __attribute__((weak)) get_calendar_weekday_symbol(StringView, StringView, CalendarPatternStyle, Weekday) { return {}; }
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Optional<StringView> __attribute__((weak)) get_calendar_day_period_symbol(StringView, StringView, CalendarPatternStyle, DayPeriod) { return {}; }
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Optional<StringView> __attribute__((weak)) get_calendar_day_period_symbol_for_hour(StringView, StringView, CalendarPatternStyle, u8) { return {}; }
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Optional<StringView> __attribute__((weak)) get_time_zone_name(StringView, StringView, CalendarPatternStyle, TimeZone::InDST) { return {}; }
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Optional<TimeZoneFormat> __attribute__((weak)) get_time_zone_format(StringView) { return {}; }
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static Optional<String> format_time_zone_offset(StringView locale, CalendarPatternStyle style, i64 offset_seconds)
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{
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auto formats = get_time_zone_format(locale);
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if (!formats.has_value())
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return {};
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auto number_system = get_default_number_system(locale);
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if (!number_system.has_value())
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return {};
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if (offset_seconds == 0)
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return formats->gmt_zero_format;
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auto sign = offset_seconds > 0 ? formats->symbol_ahead_sign : formats->symbol_behind_sign;
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auto separator = offset_seconds > 0 ? formats->symbol_ahead_separator : formats->symbol_behind_separator;
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offset_seconds = llabs(offset_seconds);
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auto offset_hours = offset_seconds / 3'600;
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offset_seconds %= 3'600;
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auto offset_minutes = offset_seconds / 60;
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offset_seconds %= 60;
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StringBuilder builder;
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builder.append(sign);
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switch (style) {
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// The long format always uses 2-digit hours field and minutes field, with optional 2-digit seconds field.
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case CalendarPatternStyle::LongOffset:
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builder.appendff("{:02}{}{:02}", offset_hours, separator, offset_minutes);
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if (offset_seconds > 0)
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builder.appendff("{}{:02}", separator, offset_seconds);
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break;
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// The short format is intended for the shortest representation and uses hour fields without leading zero, with optional 2-digit minutes and seconds fields.
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case CalendarPatternStyle::ShortOffset:
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builder.appendff("{}", offset_hours);
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if (offset_minutes > 0) {
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builder.appendff("{}{:02}", separator, offset_minutes);
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if (offset_seconds > 0)
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builder.appendff("{}{:02}", separator, offset_seconds);
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}
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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// The digits used for hours, minutes and seconds fields in this format are the locale's default decimal digits.
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auto result = replace_digits_for_number_system(*number_system, builder.build());
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return formats->gmt_format.replace("{0}"sv, result, ReplaceMode::FirstOnly);
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}
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// https://unicode.org/reports/tr35/tr35-dates.html#Time_Zone_Format_Terminology
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String format_time_zone(StringView locale, StringView time_zone, CalendarPatternStyle style, AK::Time time)
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{
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auto offset = TimeZone::get_time_zone_offset(time_zone, time);
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if (!offset.has_value())
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return time_zone;
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switch (style) {
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case CalendarPatternStyle::Short:
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case CalendarPatternStyle::Long:
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case CalendarPatternStyle::ShortGeneric:
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case CalendarPatternStyle::LongGeneric:
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if (auto name = get_time_zone_name(locale, time_zone, style, offset->in_dst); name.has_value())
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return *name;
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break;
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case CalendarPatternStyle::ShortOffset:
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case CalendarPatternStyle::LongOffset:
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return format_time_zone_offset(locale, style, offset->seconds).value_or(time_zone);
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default:
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VERIFY_NOT_REACHED();
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}
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// If more styles are added, consult the following table to ensure always falling back to GMT offset is still correct:
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// https://unicode.org/reports/tr35/tr35-dates.html#dfst-zone
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switch (style) {
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case CalendarPatternStyle::Short:
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case CalendarPatternStyle::ShortGeneric:
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return format_time_zone(locale, time_zone, CalendarPatternStyle::ShortOffset, time);
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case CalendarPatternStyle::Long:
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case CalendarPatternStyle::LongGeneric:
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return format_time_zone(locale, time_zone, CalendarPatternStyle::LongOffset, time);
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default:
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VERIFY_NOT_REACHED();
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}
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}
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}
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