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

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
+}
+
+}