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Postings from April 2003
http://rt.perl.org/rt2/Ticket/Display.html?id=8063 The requester mentions that some source filters clobber the DATA filehanle. In my testing (and as I suspected), Filter::Util::Call doesn't mess with the DATA filehandle so sane source filter implementations based on this module wouldn't be a problem. Of course, hand-rolled source filters could very well clobber the DATA filehandle. With this in mind I submit the following patch. The thing is, I'm not sure if it's necessary because perlfilter is all about using Filter::Util::Call. What say you? Casey West -- Shooting yourself in the foot with Ada After correctly packing your foot, you attempt to concurrently load the gun, pull the trigger, scream, and confidently aim at your foot knowing it is safe. However the cordite in the round does an Unchecked Conversion, fires and shoots you in the foot anyway. --- perl-current.orig/pod/perlfilter.pod Mon Nov 12 10:56:58 2001 +++ perl-current/pod/perlfilter.pod Mon Apr 28 10:55:37 2003 @@ -551,6 +551,20 @@ you know. The tricky bit will be choosing how much knowledge of Perl's syntax you want your filter to have. +=head1 THINGS TO LOOK OUT FOR + +=over 5 + +=item Some Filters Clobber the C<DATA> Handle + +Some source filters use the C<DATA> handle to read the calling program. +When using these source filters you cannot rely on this handle, nor expect +any particular kind of behavior when operating on it. Filters based on +Filter::Util::Call (and therefore Filter::Simple) do not alter the C<DATA> +filehandle. + +=back + =head1 REQUIREMENTS The Source Filters distribution is available on CPAN, in LocalWords: NovThread Next