Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibUnicode/RelativeTimeFormat.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2022-2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullOwnPtr.h>
+#include <AK/Optional.h>
+#include <AK/String.h>
+#include <AK/StringView.h>
+#include <AK/Vector.h>
+#include <LibUnicode/Forward.h>
+
+namespace Unicode {
+
+// These are just the subset of fields in the CLDR required for ECMA-402.
+enum class TimeUnit {
+    Second,
+    Minute,
+    Hour,
+    Day,
+    Week,
+    Month,
+    Quarter,
+    Year,
+};
+Optional<TimeUnit> time_unit_from_string(StringView);
+StringView time_unit_to_string(TimeUnit);
+
+enum class NumericDisplay {
+    Always,
+    Auto,
+};
+NumericDisplay numeric_display_from_string(StringView);
+StringView numeric_display_to_string(NumericDisplay);
+
+class RelativeTimeFormat {
+public:
+    static NonnullOwnPtr<RelativeTimeFormat> create(StringView locale, Style style);
+    virtual ~RelativeTimeFormat() = default;
+
+    struct Partition {
+        StringView type;
+        String value;
+        StringView unit;
+    };
+
+    virtual String format(double, TimeUnit, NumericDisplay) const = 0;
+    virtual Vector<Partition> format_to_parts(double, TimeUnit, NumericDisplay) const = 0;
+
+protected:
+    RelativeTimeFormat() = default;
+};
+
+}