+bool isOpenPunctuation(char_type c)
+{
+ if (!is_utf16(c)) {
+ // assume that no non-utf16 character is an op
+ // c outside the UCS4 range is catched as well
+ return false;
+ }
+ QChar const qc = ucs4_to_qchar(c);
+ return qc.category() == QChar::Punctuation_Open;
+}
+
+