[MacRuby-devel] StringScanner Performance

[Watson]

Hi,

I think your report is relating with http://www.macruby.org/trac/ticket/1341


Thanks

2012/4/19 Sylvester Keil <sylvester.keil at 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
>
>
>
>
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