On Mon, 30 Jan 2017 13:53:46 +0200 "Andrew W. Nosenko" <andrew.w.nose...@gmail.com> wrote: > On Sun, Jan 29, 2017 at 2:16 AM, Eric Cashon via gtk-devel-list < > gtk-devel-list@gnome.org> wrote: > > > > > I have been working on a little search experimentation. Gave > > writing a case in-sensitive gtk_text_iter_forward_search() a try. > > The code is shorter than what is in gtktextiter.c and it works a > > little faster. If a word is searched that isn't very frequent the > > time is about the same. If you just look for single chars or words > > that are frequent it looks to be quicker. Not sure if this a > > suitable method though. I know little of the textbuffer internals. > > UTF-8 gives me some trouble also. > > > > There is a test progam at > > > > https://github.com/cecashon/OrderedSetVelociRaptor/blob/ > > master/Misc/Csamples/search_textbuffer2.c > > > > that does a side by side comparison of the two search methods. If > > there is an inherent problem with the test forward search please > > say so. If not, maybe it can be used. I would be glad to work on it > > a little more if corrections need to be made. > > > > Sorry, but your approach just doesn't work. > You falsely assume that if bring two characters to the same case > (both to lower or both to upper), then it's enough for > case-insensetive search. While it's indeed enough for English, it's > not true in the general case. Just try to compare "Straße" and > "STRASSE", which mean "street" in German, using your code. (The > second string is an uppercased version of the first, so searching for > one should match another.)
Problems like this can arise with unicode in any writing, including English. Printed words in modern English can have lower-case ligatures similar to ß (which a few hundred years ago was also a ligature used in printed English), viz: field - four code points FIELD - five code points Comparing unicode strings is fraught with difficulty, including the assumption that "character" is the same as "code point". Chris _______________________________________________ gtk-devel-list mailing list gtk-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-devel-list
