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ethan (3163)

ethan
  reversethis-{ed. ... rap.nov.olissat}

Being a 25-year old chap living in the western-most town of Germany. Stuying communication and information science and being a huge fan of XS-related things.

Journal of ethan (3163)

Friday April 04, 2003
02:45 AM

source filtering

[ #11440 ]

Source filters are really cool and a nice playground. Here's one that eliminates the need for use() or require() most of the time:


        package RealAutoUse; # autouse already exists but does something else

        use strict;
        use Filter::Simple;

        my %load;

        use Filter::Simple;

        FILTER_ONLY executable => sub {
                # perhaps a little too simple-minded, but alas
                while (/([A-Za-z0-9_:]+)\s*(?:->|::)(\s*\w+)/g) {
                        $load{ $1 }++;
                }
                $_ = join "\n", map ("require $_;", keys %load), $_;
        };

        1;

Naturally, this is more useful with object-oriented modules:


        use RealAutoUse;

        my $cgi = CGI->new;
        print $cgi->header("text/plain");
        print $cgi->param("para");

        # but functional ones work, too

        print POSIX::strftime("%H", localtime);

Too bad that mere filtering wont do for cases where modules export symbols etc., otherwise this little piece of code could have made it to the CPAN.

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  • <plug type="CPAN module"> Module::MagicUse [cpan.org] </plug>
    --

    broquaint out

    • Wasn't aware of it yet. You seem to be doing it a little differently by not letting one of the Filter modules change the code but instead string-evaling the necessary use-statements.

      But yours can deal with indirect method invocation. I forgot about that.