LibUnicode: Parse and generate date, time, and date-time format patterns

Userland/Libraries/LibUnicode/CMakeLists.txt

@@ -4,6 +4,7 @@ SET(SOURCES
     ${UNICODE_DATA_SOURCES}
     CharacterTypes.cpp
     CurrencyCode.cpp
+    DateTimeFormat.cpp
     Locale.cpp
     NumberFormat.cpp
 )

Userland/Libraries/LibUnicode/DateTimeFormat.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibUnicode/DateTimeFormat.h>
+
+#if ENABLE_UNICODE_DATA
+#    include <LibUnicode/UnicodeDateTimeFormat.h>
+#endif
+
+namespace Unicode {
+
+CalendarPatternStyle calendar_pattern_style_from_string(StringView style)
+{
+    if (style == "narrow"sv)
+        return CalendarPatternStyle::Narrow;
+    if (style == "short"sv)
+        return CalendarPatternStyle::Short;
+    if (style == "long"sv)
+        return CalendarPatternStyle::Long;
+    if (style == "numeric"sv)
+        return CalendarPatternStyle::Numeric;
+    if (style == "2-digit"sv)
+        return CalendarPatternStyle::TwoDigit;
+    VERIFY_NOT_REACHED();
+}
+
+StringView calendar_pattern_style_to_string(CalendarPatternStyle style)
+{
+    switch (style) {
+    case CalendarPatternStyle::Narrow:
+        return "narrow"sv;
+    case CalendarPatternStyle::Short:
+        return "short"sv;
+    case CalendarPatternStyle::Long:
+        return "long"sv;
+    case CalendarPatternStyle::Numeric:
+        return "Numeric"sv;
+    case CalendarPatternStyle::TwoDigit:
+        return "2-digit"sv;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
+Optional<CalendarFormat> get_calendar_format([[maybe_unused]] StringView locale, [[maybe_unused]] StringView calendar, [[maybe_unused]] CalendarFormatType type)
+{
+#if ENABLE_UNICODE_DATA
+    switch (type) {
+    case CalendarFormatType::Date:
+        return Detail::get_calendar_date_format(locale, calendar);
+    case CalendarFormatType::Time:
+        return Detail::get_calendar_time_format(locale, calendar);
+    case CalendarFormatType::DateTime:
+        return Detail::get_calendar_date_time_format(locale, calendar);
+    default:
+        VERIFY_NOT_REACHED();
+    }
+#else
+    return {};
+#endif
+}
+
+}

Userland/Libraries/LibUnicode/DateTimeFormat.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Optional.h>
+#include <AK/String.h>
+#include <AK/StringView.h>
+#include <AK/Types.h>
+#include <LibUnicode/Forward.h>
+
+namespace Unicode {
+
+enum class CalendarPatternStyle : u8 {
+    Narrow,
+    Short,
+    Long,
+    Numeric,
+    TwoDigit,
+};
+
+struct CalendarPattern {
+    String pattern {};
+    Optional<String> pattern12 {};
+
+    // https://unicode.org/reports/tr35/tr35-dates.html#Calendar_Fields
+    Optional<CalendarPatternStyle> era {};
+    Optional<CalendarPatternStyle> year {};
+    Optional<CalendarPatternStyle> month {};
+    Optional<CalendarPatternStyle> weekday {};
+    Optional<CalendarPatternStyle> day {};
+    Optional<CalendarPatternStyle> day_period {};
+    Optional<CalendarPatternStyle> hour {};
+    Optional<CalendarPatternStyle> minute {};
+    Optional<CalendarPatternStyle> second {};
+    Optional<u8> fractional_second_digits {};
+    Optional<CalendarPatternStyle> time_zone_name {};
+};
+
+enum class CalendarFormatType : u8 {
+    Date,
+    Time,
+    DateTime,
+};
+
+struct CalendarFormat {
+    CalendarPattern full_format {};
+    CalendarPattern long_format {};
+    CalendarPattern medium_format {};
+    CalendarPattern short_format {};
+};
+
+CalendarPatternStyle calendar_pattern_style_from_string(StringView style);
+StringView calendar_pattern_style_to_string(CalendarPatternStyle style);
+Optional<CalendarFormat> get_calendar_format(StringView locale, StringView calendar, CalendarFormatType type);
+
+}

Userland/Libraries/LibUnicode/Forward.h

@@ -10,6 +10,8 @@
 
 namespace Unicode {
 
+enum class CalendarFormatType : u8;
+enum class CalendarPatternStyle : u8;
 enum class CompactNumberFormatType : u8;
 enum class Condition : u8;
 enum class GeneralCategory : u8;
@@ -24,6 +26,8 @@ enum class Style : u8;
 enum class Territory : u8;
 enum class WordBreakProperty : u8;
 
+struct CalendarFormat;
+struct CalendarPattern;
 struct CurrencyCode;
 struct Keyword;
 struct LanguageID;