you're absolutely right, this issue is related. So we would require a Regular Expression method that matches only at the beginning of the string and does not populate Regexp.last_match.
On Apr 19, 2012, at 3:58 PM, Watson wrote: > Hi, > > I think your report is relating with http://www.macruby.org/trac/ticket/1341 > > > Thanks > > 2012/4/19 Sylvester Keil <sylvester.k...@gmail.com>: >> Dear all, >> >> while debugging performance issues for a gem (bibtex-ruby) I noticed that >> MacRuby's StringScanner implementation creates new Regular Expression >> objects every time #scan is called; as I am dealing with a lexical analyzer >> based on StringScanner the #scan method is quite crucial and the current >> implementation performs so slowly that it is basically unusable on MacRuby. >> >> This is the problematic method in MacRuby: >> >> https://github.com/MacRuby/MacRuby/blob/master/lib/strscan.rb#L638 >> >> Both MRI and Rubinius work around this by using a feature of Oniguruma >> patterns to match the pattern at the beginning of a string only. Here are >> the corresponding sections: >> >> https://github.com/ruby/ruby/blob/trunk/ext/strscan/strscan.c#L437 >> https://github.com/rubinius/rubinius/blob/master/lib/strscan.rb#L264 >> >> Do regular expressions in MacRuby expose similar functionality to either >> Ruby or C extensions? I'd be happy to help resolving this issue, but have no >> experience with MacRuby so any pointers on how to best approach this are >> much appreciated. >> >> Thanks, >> >> Sylvester >> >> >> >> >> _______________________________________________ >> MacRuby-devel mailing list >> MacRuby-devel@lists.macosforge.org >> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel > _______________________________________________ > MacRuby-devel mailing list > MacRuby-devel@lists.macosforge.org > http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel _______________________________________________ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
