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 :
>> 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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