Dutch ‘IJ’ capitalisation. #11
Description
Firstly, let me thank you for all of the work you have put into this library. It is exactly what I was looking for.
In Dutch, there exists a digraph ‘IJ’. In many circumstances, it is treated as if it were a single letter. If a word begins with IJ, then both letters will be capitalised if the first letter needs to be capitalised. (More information here.) For example, the name of the IJssel river has both a capital I and J.
With this in mind, the to_titlecase function should act as follows:
const auto decodedString = unicode::utf8::decode("ik hou van ijsje");
// Call to_titlecase with Dutch language code.
const auto titleCaseCodepoints = unicode::to_titlecase(decodedString , "nl");
// encodedString should be "Ik Hou Van IJsje" instead of "Ik Hou Van Ijsje".
const auto encodedString = unicode::utf8::encode(titleCaseCodepoints);