If there were two flip() functions, Simon, a naive one that understands nothing more than raw codepoints, and a sophisticated one that is "aware" of combined Unicode forms/graphemes, then the excellent would not become the enemy of the good and the raw one could be put in place without much to-do.
Tim Romano Simon Slavin wrote: > On 17 Nov 2009, at 5:52pm, Igor Tandetnik wrote: > > >> But for your goals, it has to be sortable, right? In a proper Unicode >> collation, U+0041 U+0301 would behave quite differently from U+0301 U+0041. >> Consider "A ' E" (where ' stands for a combining acute accent). In most >> locales, this would sort between AE and BE. Now, if we reverse it naively, >> we'll end up with "E ' A", with the accent now attached to E and not A. The >> result would sort between EA and FA, rather than between EA and EB as you >> would probably want. >> > > Obviously, your routine to reverse a string must be unicode-aware. First > split the string into characters, then reassemble them in reverse order. So > it will have to understand what 'character' means with regard to unicode and > understand the unicode rules for combination characters. The only way to do > this properly is to find a unicode library licensed along similar lines to > sqlite and integrate it. If one doesn't exist, one needs to be written. > This is not a trivial task. > > This revisits one of the recurring responses to my thread about what people > want added to sqlite, and that answer boiled down to unicode-awareness rather > than unicode-compatibility. > > Simon. > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.425 / Virus Database: 270.14.69/2508 - Release Date: 11/17/09 > 07:40:00 > > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
