How can I list all variables that are in a given scope?
And that does it. Thanks to MGoDave and kbosak for providing the answer in front of my face that I was too stupid to see (I looked in %main:: to start with, but missed that they didn't have their sigils). Here is the complete code:
#!/usr/bin/perl
use strict;
use warnings;
use PadWalker qw/peek_our peek_my/;
use Data::Dumper;
our $foo = 1;
our $bar = 2;
{
my $foo = 3;
print Dumper in_scope_variables();
}
print Dumper in_scope_variables();
sub in_scope_variables {
my %in_scope = %{peek_our(1)};
my $lexical = peek_my(1);
for my $name (keys %main::) {
my $glob = $main::{$name};
if (defined ${$glob}) {
$in_scope{'$' . $name} = ${$glob};
}
if (defined @{$glob}) {
$in_scope{'@' . $name} = [@{$glob}];
}
if (defined %{$glob}) {
$in_scope{'%' . $name} = {%{$glob}};
}
}
#lexicals hide package variables
while (my ($var, $ref) = each %$lexical) {
$in_scope{$var} = $ref;
}
return \%in_scope;
}
You can do something like the following to check the symbol table of the main package:
{
no strict 'refs';
for my $var (keys %{'main::'}) {
print "$var\n";
}
}
You can access the symbol table, check out p. 293 of "Programming Perl" Also look at "Mastering Perl: http://www252.pair.com/comdog/mastering_perl/ Specifically: http://www252.pair.com/comdog/mastering_perl/Chapters/08.symbol_tables.html
Those variables you are looking for will be under the main namespace
A quick Google search gave me:
{
no strict 'refs';
foreach my $entry ( keys %main:: )
{
print "$entry\n";
}
}
You can also do
*sym = $main::{"/"}
and likewise for other values
If you want to find the type of the symbol you can do (from mastering perl):
foreach my $entry ( keys %main:: )
{
print "-" x 30, "Name: $entry\n";
print "\tscalar is defined\n" if defined ${$entry};
print "\tarray is defined\n" if defined @{$entry};
print "\thash is defined\n" if defined %{$entry};
print "\tsub is defined\n" if defined &{$entry};
}