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Function `std.uni.toLowerSpecial`

Converts s to lowercase using locale-aware special casing rules from Unicode 3.13 Section 3.13. Unlike toLower, this function handles conditional casing rules that depend on surrounding context and language, such as:


						
				string toLowerSpecial(
				
  string s,
				
  CasingLanguage lang
				

				) @trusted;

Final_Sigma: Greek capital sigma (U+03A3) lowercases to final sigma (U+03C2) only when it appears at the end of a word.
Turkish/Azeri: The dotted I (U+0130) lowercases to plain i, and plain I lowercases to dotless i (U+0131).
Lithuanian: Capital I and J retain an explicit dot above when lowercased and followed by combining accents.

The existing toLower handles only the unconditional mappings. This function adds the conditional rules that require knowledge of the locality, the preceding, and following characters.

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 lowercase mapping applied.

Authors

Dmitry Olshansky

License

Boost License 1.0.