Re^5: Introsepcting the current Perl file via DATA, even w/o DATA? (perl5db.pl)

in reply to Re^4: Introspecting the current Perl file via DATA, even w/o DATA? (perl5db.pl)
in thread Introspecting the current Perl file via DATA, even w/o DATA?

Anyway, let us know if you'll find something details about that magic. ;-)

You're so lazy, LanX ;) I'm sure you could do it yourself, but if you insist...

# main.pl
BEGIN {
    $^P = 0x400;
}
use test ();
[download]

and

# test.pm
my @source = @{ $main::{ '_<' . __FILE__ } };
print for @source;
1;
[download]

Now, the thing is, you have to set $^P before the file (test.pm in this case) is even opened. So you can't do it inside test.pm itself, I don't think...

Is that good enough for you?

Comment on Re^5: Introsepcting the current Perl file via DATA, even w/o DATA? (perl5db.pl) Select or Download Code

Replies are listed 'Best First'.
Re^6: Introsepcting the current Perl file via DATA, even w/o DATA? (perl5db.pl) by Mr. Muskrat (Canon) on Feb 05, 2016 at 16:37 UTC
I found this interesting so I played with it briefly... `# main.pl my @source = @{ $main::{ '_<' . __FILE__ } }; shift @source; # get rid of sub DB::DB{}; print for @source;` [download] and `PERL5DB="sub DB::DB{}" perl -d main.pl` [download] Output: `my @source = @{ $main::{ '_<' . __FILE__ } }; shift @source; # get rid of sub DB::DB{}; print for @source;` [download] Update: I had found @{$main::{'_<'.$filename}} yesterday but didn't have time to play with it. Update 2: Added shift.	[reply] [d/l] [select]
Re^7: Introspecting the current Perl file via DATA, even w/o DATA? (perl5db.pl) by LanX (Saint) on Feb 05, 2016 at 17:05 UTC
> Added shift. as a side note: line numbers start with 1, so changing the content of the 0th element may be the better strategy. ( Otherwise looking up a line will include a cumbersome -1 operation.) Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply]
Re^6: Introspecting the current Perl file via DATA, even w/o DATA? (perl5db.pl) by LanX (Saint) on Feb 05, 2016 at 16:19 UTC
> Is that good enough for you? yes, I knew I can count on your collaboration! ;) > Now, the thing is, you have to set `$^P` before the file (test.pm in this case) is even opened. I think one could trick that², the question is rather about other penalties included. ... let's have a look into perlvar#$^P ... `x400 Save source code lines into @{"_<$filename"} .` [download] OK this doesn't look to expensive ... benchmark needed. (too busy now ;-) Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!} footnotes ²) for instance IIRC it's possible to configure global setting for your perl interpreter.	[reply] [d/l] [select]

In Section Seekers of Perl Wisdom

footnotes