AK+LibUnicode: Expose TrailingCodePointTransformation in to_titlecase

Relocating the definition of this enum from LibUnicode to AK.

AK/Forward.h

@@ -17,6 +17,8 @@ template<size_t inline_capacity>
 class ByteBuffer;
 }
 
+enum class TrailingCodePointTransformation : u8;
+
 class BigEndianInputBitStream;
 class BigEndianOutputBitStream;
 class Bitmap;
@@ -198,6 +200,7 @@ using AK::String;
 using AK::StringBuilder;
 using AK::StringImpl;
 using AK::StringView;
+using AK::TrailingCodePointTransformation;
 using AK::Traits;
 using AK::UnixDateTime;
 using AK::URL;

AK/String.h

@@ -95,7 +95,7 @@ public:
     // Creates a new String by case-transforming this String. Using these methods require linking LibUnicode into your application.
     ErrorOr<String> to_lowercase(Optional<StringView> const& locale = {}) const;
     ErrorOr<String> to_uppercase(Optional<StringView> const& locale = {}) const;
-    ErrorOr<String> to_titlecase(Optional<StringView> const& locale = {}) const;
+    ErrorOr<String> to_titlecase(Optional<StringView> const& locale = {}, TrailingCodePointTransformation trailing_code_point_transformation = TrailingCodePointTransformation::Lowercase) const;
     ErrorOr<String> to_casefold() const;
 
     // Compare this String against another string with caseless matching. Using this method requires linking LibUnicode into your application.

AK/StringUtils.h

@@ -54,6 +54,13 @@ enum class SplitBehavior : unsigned {
 };
 AK_ENUM_BITWISE_OPERATORS(SplitBehavior);
 
+enum class TrailingCodePointTransformation : u8 {
+    // Default behaviour; Puts the first typographic letter unit of each word, if lowercase, in titlecase; the other characters in lowercase.
+    Lowercase,
+    // Puts the first typographic letter unit of each word, if lowercase, in titlecase; other characters are unaffected. (https://drafts.csswg.org/css-text/#valdef-text-transform-capitalize)
+    PreserveExisting,
+};
+
 struct MaskSpan {
     size_t start;
     size_t length;
@@ -117,6 +124,7 @@ size_t count(StringView, char needle);
 using AK::CaseSensitivity;
 using AK::ReplaceMode;
 using AK::SplitBehavior;
+using AK::TrailingCodePointTransformation;
 using AK::TrimMode;
 using AK::TrimWhitespace;
 #endif

Userland/Libraries/LibUnicode/CharacterTypes.h

@@ -34,13 +34,6 @@ struct BlockName {
     StringView display_name;
 };
 
-enum class TrailingCodePointTransformation : u8 {
-    // Default behaviour; Puts the first typographic letter unit of each word, if lowercase, in titlecase; the other characters in lowercase.
-    Lowercase,
-    // Puts the first typographic letter unit of each word, if lowercase, in titlecase; other characters are unaffected. (https://drafts.csswg.org/css-text/#valdef-text-transform-capitalize)
-    PreserveExisting,
-};
-
 Optional<DeprecatedString> code_point_display_name(u32 code_point);
 Optional<StringView> code_point_block_display_name(u32 code_point);
 Optional<StringView> code_point_abbreviation(u32 code_point);

Userland/Libraries/LibUnicode/Forward.h

@@ -19,7 +19,6 @@ enum class Property : u8;
 enum class Script : u8;
 enum class SentenceBreakProperty : u8;
 enum class WordBreakProperty : u8;
-enum class TrailingCodePointTransformation : u8;
 
 struct CodePointDecomposition;
 struct CurrencyCode;

Userland/Libraries/LibUnicode/String.cpp

@@ -28,10 +28,10 @@ ErrorOr<String> String::to_uppercase(Optional<StringView> const& locale) const
     return builder.to_string();
 }
 
-ErrorOr<String> String::to_titlecase(Optional<StringView> const& locale) const
+ErrorOr<String> String::to_titlecase(Optional<StringView> const& locale, TrailingCodePointTransformation trailing_code_point_transformation) const
 {
     StringBuilder builder;
-    TRY(Unicode::Detail::build_titlecase_string(code_points(), builder, locale, Unicode::TrailingCodePointTransformation::Lowercase));
+    TRY(Unicode::Detail::build_titlecase_string(code_points(), builder, locale, trailing_code_point_transformation));
     return builder.to_string();
 }