Oh wise perl masters, I am humbly seeking guidance.

I just recently discovered subroutine attributes in perl, because I'm starting to read about Catalyst. I kind of get them, but really I don't. :-/

I've read many documents on attributes, but something still isn't clicking for me. The Attribute::Deprecated module is a good basic example of how use to attributes based on the Attribute::Handlers module. I can use attributes that way and get it.

But, to get a deeper understanding (and because this is how Catalyst uses attributes), I've been trying to use the attributes pragma directly, but the documentation isn't answering a question I still have. The Catalyst code on this isn't a good example for me because it looks to be so highly optimized.

My question is illustrated by the code I have below, right on the "magic happens here" line.

How do I create the magic? 

#!/usr/bin/perl -w
use strict;
use attributes;

sub FETCH_CODE_ATTRIBUTES {
    return qw(Big Damn Test);
}

sub MODIFY_CODE_ATTRIBUTES {
    my ( $class, $code, @attrs ) = @_;

    if ( $class ne 'main' ) {
        if (my $code = $class->SUPER::can('MODIFY_CODE_ATTRIBUTES')) {
            @attrs = $code->( $class, $code, @attrs );
        }
    }

    my @unknown;
    foreach my $attr (@attrs) {
        if ( 1 ) { # yeah, I'm supposed to handle this attribute
            # "There is no spoon."
            # Magic Happens Here .. ???
        }
        else {
            push @unknown, $attr;
        }
    }
    return @unknown;
}

sub foo : Big Damn Test {
    warn "SPOOON!";
}

foo();

[download]
Thanks so much for any help on this.
-- mshiltonj

In reply to How do you use/create subroutine attributes? by mshiltonj

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