LibUnicode: Parse and generate the Unicode locale list patterns dataset

This data informs consumers how to join lists of values. For example,
in en-US, the list ["a", "b", "c"] formatted to a string should become
"a, b, and c".

3 files changed, 20 insertions, 0 deletions

diff --git a/Userland/Libraries/LibUnicode/Forward.h b/Userland/Libraries/LibUnicode/Forward.h
index 33a6991b31..5d9dde274e 100644
--- a/Userland/Libraries/LibUnicode/Forward.h
+++ b/Userland/Libraries/LibUnicode/Forward.h
@@ -13,6 +13,8 @@ namespace Unicode {
 enum class Condition : u8;
 enum class GeneralCategory : u8;
 enum class Language : u8;
+enum class ListPatternStyle : u8;
+enum class ListPatternType : u8;
 enum class Locale : u16;
 enum class Property : u8;
 enum class Script : u8;
@@ -21,6 +23,7 @@ enum class WordBreakProperty : u8;
 
 struct Keyword;
 struct LanguageID;
+struct ListPatterns;
 struct LocaleExtension;
 struct LocaleID;
 struct OtherExtension;
diff --git a/Userland/Libraries/LibUnicode/Locale.cpp b/Userland/Libraries/LibUnicode/Locale.cpp
index d293e2c493..025d202458 100644
--- a/Userland/Libraries/LibUnicode/Locale.cpp
+++ b/Userland/Libraries/LibUnicode/Locale.cpp
@@ -798,6 +798,15 @@ Optional<StringView> get_locale_currency_mapping([[maybe_unused]] StringView loc
 #endif
 }
 
+Optional<ListPatterns> get_locale_list_patterns([[maybe_unused]] StringView locale, [[maybe_unused]] StringView type, [[maybe_unused]] StringView style)
+{
+#if ENABLE_UNICODE_DATA
+    return Detail::get_locale_list_pattern_mapping(locale, type, style);
+#else
+    return {};
+#endif
+}
+
 Optional<StringView> resolve_language_alias(StringView language)
 {
 #if ENABLE_UNICODE_DATA
diff --git a/Userland/Libraries/LibUnicode/Locale.h b/Userland/Libraries/LibUnicode/Locale.h
index 0a388fd16e..428d84714b 100644
--- a/Userland/Libraries/LibUnicode/Locale.h
+++ b/Userland/Libraries/LibUnicode/Locale.h
@@ -78,6 +78,13 @@ struct LocaleID {
     Vector<String> private_use_extensions {};
 };
 
+struct ListPatterns {
+    StringView start;
+    StringView middle;
+    StringView end;
+    StringView pair;
+};
+
 // 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)
@@ -130,6 +137,7 @@ Optional<StringView> get_locale_language_mapping(StringView locale, StringView l
 Optional<StringView> get_locale_territory_mapping(StringView locale, StringView territory);
 Optional<StringView> get_locale_script_mapping(StringView locale, StringView script);
 Optional<StringView> get_locale_currency_mapping(StringView locale, StringView currency);
+Optional<ListPatterns> get_locale_list_patterns(StringView locale, StringView type, StringView style);
 
 Optional<StringView> resolve_language_alias(StringView language);
 Optional<StringView> resolve_territory_alias(StringView territory);