Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Displaying symbol tables for debugging

by integral (Hermit)
on Feb 09, 2003 at 08:37 UTC ( #233859=snippet: print w/replies, xml ) Need Help??
Description: Although there are now Devel:: modules on CPAN which do an excellent job of making symbol tables easy to play with, I wrote these three routines for quick debugging of some code which played around with Safe and other symbol table tricks.
sub packages {
  print "Packages: ", join(" ", grep /::$/, keys %::), "\n";
  print "  INC: ", join(" ", sort keys %INC), "\n";
}

sub symbols {
  my $pkg = $_[0] || '';
  no strict 'refs';
  print "Symbols: ", join(" ", sort keys %{$pkg.'::'}), "\n";
}

sub symbols2 {
  my $pkg = $_[0] || '';
  no strict 'refs';
  print "Symbols in ${pkg}::\n";
  my $hash = *{$pkg.'::'}{HASH};
  for (sort grep {!/::$|^_</} keys %$hash) {
    my $sym = $_;
    my $glob = $hash->{$_};
    $sym =~ s/[[:cntrl:]]/'^' . chr(ord($&) + ord('@'))/ge;
    print "  $sym (", *{$glob}{PACKAGE}, '::', *{$glob}{NAME}, "): ";
    if (defined $$_) {
      print "SCALAR='$$glob' ";
    };
    for my $THING (qw(ARRAY HASH CODE IO)) {
      my $ref = *{$glob}{$THING};
      if (defined $ref) {
        print "$THING=$ref ";
      }
    }
    print "\n";
  }
}
Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: snippet [id://233859]
help
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (5)
As of 2017-03-25 19:49 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Should Pluto Get Its Planethood Back?



    Results (313 votes). Check out past polls.