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Function `std.uni.toTitleSpecial`

Converts s to titlecase using locale-aware special casing rules from Unicode 3.13 Section 3.13. Unlike the existing titlecase conversion, this function handles conditional casing rules that depend on surrounding context and language.


						
				string toTitleSpecial(
				
  string s,
				
  CasingLanguage lang
				

				) @trusted;

Parameters

Name	Description
s	the string to convert
lang	the language context to use for language-sensitive rules

Returns

A newly allocated string with the locale-aware titlecase mapping applied.

Example

// Unconditional special casing still works via existing toLower
writeln(toLower("\u0130")); // "i\u0307"

// Turkish
writeln(toLowerSpecial("\u0130", CasingLanguage.Turkish)); // "i"
writeln(toUpperSpecial("i", CasingLanguage.Turkish)); // "\u0130"
writeln(toLowerSpecial("I", CasingLanguage.Turkish)); // "\u0131"
writeln(toUpperSpecial("\u0131", CasingLanguage.Turkish)); // "I"
writeln(toTitleSpecial("\u0069", CasingLanguage.Turkish)); // "\u0130"

// Azeri (same as Turkish for these rules)
writeln(toLowerSpecial("I", CasingLanguage.Azeri)); // "\u0131"

// Lithuanian: I + grave -> i + dot above + grave
writeln(toLowerSpecial("I\u0300", CasingLanguage.Lithuanian)); // "i\u0307\u0300"
writeln(toLowerSpecial("J\u0300", CasingLanguage.Lithuanian)); // "j\u0307\u0300"

// Existing functions untouched
writeln(toLower("hello")); // "hello"
writeln(toUpper("hello")); // "HELLO"

Authors

Dmitry Olshansky

License

Boost License 1.0.