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/Locale.h

@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2021-2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/CharacterTypes.h>
+#include <AK/Optional.h>
+#include <AK/String.h>
+#include <AK/StringView.h>
+#include <AK/Variant.h>
+#include <AK/Vector.h>
+#include <LibUnicode/Forward.h>
+
+namespace Unicode {
+
+struct LanguageID {
+    String to_string() const;
+    bool operator==(LanguageID const&) const = default;
+
+    bool is_root { false };
+    Optional<String> language {};
+    Optional<String> script {};
+    Optional<String> region {};
+    Vector<String> variants {};
+};
+
+struct Keyword {
+    String key {};
+    String value {};
+};
+
+struct LocaleExtension {
+    Vector<String> attributes {};
+    Vector<Keyword> keywords {};
+};
+
+struct TransformedField {
+    String key {};
+    String value {};
+};
+
+struct TransformedExtension {
+    Optional<LanguageID> language {};
+    Vector<TransformedField> fields {};
+};
+
+struct OtherExtension {
+    char key {};
+    String value {};
+};
+
+using Extension = AK::Variant<LocaleExtension, TransformedExtension, OtherExtension>;
+
+struct LocaleID {
+    String to_string() const;
+
+    template<typename ExtensionType>
+    Vector<Extension> remove_extension_type()
+    {
+        Vector<Extension> removed_extensions {};
+        auto tmp_extensions = move(extensions);
+
+        for (auto& extension : tmp_extensions) {
+            if (extension.has<ExtensionType>())
+                removed_extensions.append(move(extension));
+            else
+                extensions.append(move(extension));
+        }
+
+        return removed_extensions;
+    }
+
+    LanguageID language_id {};
+    Vector<Extension> extensions {};
+    Vector<String> private_use_extensions {};
+};
+
+enum class Style {
+    Long,
+    Short,
+    Narrow,
+};
+
+// Note: These methods only verify that the provided strings match the EBNF grammar of the
+// Unicode identifier subtag (i.e. no validation is done that the tags actually exist).
+constexpr bool is_unicode_language_subtag(StringView subtag)
+{
+    // unicode_language_subtag = alpha{2,3} | alpha{5,8}
+    if ((subtag.length() < 2) || (subtag.length() == 4) || (subtag.length() > 8))
+        return false;
+    return all_of(subtag, is_ascii_alpha);
+}
+
+constexpr bool is_unicode_script_subtag(StringView subtag)
+{
+    // unicode_script_subtag = alpha{4}
+    if (subtag.length() != 4)
+        return false;
+    return all_of(subtag, is_ascii_alpha);
+}
+
+constexpr bool is_unicode_region_subtag(StringView subtag)
+{
+    // unicode_region_subtag = (alpha{2} | digit{3})
+    if (subtag.length() == 2)
+        return all_of(subtag, is_ascii_alpha);
+    if (subtag.length() == 3)
+        return all_of(subtag, is_ascii_digit);
+    return false;
+}
+
+constexpr bool is_unicode_variant_subtag(StringView subtag)
+{
+    // unicode_variant_subtag = (alphanum{5,8} | digit alphanum{3})
+    if ((subtag.length() >= 5) && (subtag.length() <= 8))
+        return all_of(subtag, is_ascii_alphanumeric);
+    if (subtag.length() == 4)
+        return is_ascii_digit(subtag[0]) && all_of(subtag.substring_view(1), is_ascii_alphanumeric);
+    return false;
+}
+
+bool is_type_identifier(StringView);
+
+Optional<LanguageID> parse_unicode_language_id(StringView);
+Optional<LocaleID> parse_unicode_locale_id(StringView);
+
+String canonicalize_unicode_locale_id(StringView);
+String canonicalize_unicode_extension_values(StringView key, StringView value);
+
+StringView default_locale();
+bool is_locale_available(StringView locale);
+
+Style style_from_string(StringView style);
+StringView style_to_string(Style style);
+
+Optional<String> add_likely_subtags(StringView);
+Optional<String> remove_likely_subtags(StringView);
+
+bool is_locale_character_ordering_right_to_left(StringView locale);
+
+}