Module:gmw-pro-sortkey

local export = {} local u = mw.ustring.char

local remove_diacritics = u(0x0304) .. u(0x0328) -- macron, ogonek

local oneChar = { ["ʀ"] = "r" }

function export.makeSortKey(text, lang, sc) return mw.ustring.upper(mw.ustring.toNFC(mw.ustring.gsub(mw.ustring.toNFD(mw.ustring.gsub(mw.ustring.lower(text), ".", oneChar)), "[" .. remove_diacritics .. "]", ""))) -- decompose, remove appropriate diacritics, then recompose again end

return export