require 5;
package Pod::Simple::Debug;
use strict;
use vars qw($VERSION );
$VERSION = '3.13';

sub import {
my($value,$variable);

if(@_ == 2) {
$value = $_[1];
} elsif(@_ == 3) {
($variable, $value) = @_[1,2];

($variable, $value) = ($value, $variable)
if defined $value and ref($value) eq 'SCALAR'
and not(defined $variable and ref($variable) eq 'SCALAR')
; # tolerate getting it backwards

unless( defined $variable and ref($variable) eq 'SCALAR') {
require Carp;
Carp::croak("Usage:\n use Pod::Simple::Debug (NUMVAL)\nor"
. "\n use Pod::Simple::Debug (\\\$var, STARTNUMVAL)\nAborting");
}
} else {
require Carp;
Carp::croak("Usage:\n use Pod::Simple::Debug (NUMVAL)\nor"
. "\n use Pod::Simple::Debug (\\\$var, STARTNUMVAL)\nAborting");
}

if( defined &Pod::Simple::DEBUG ) {
require Carp;
Carp::croak("It's too late to call Pod::Simple::Debug -- "
. "Pod::Simple has already loaded\nAborting");
}

$value = 0 unless defined $value;

unless($value =~ m/^-?\d+$/) {
require Carp;
Carp::croak( "$value isn't a numeric value."
. "\nUsage:\n use Pod::Simple::Debug (NUMVAL)\nor"
. "\n use Pod::Simple::Debug (\\\$var, STARTNUMVAL)\nAborting");
}

if( defined $variable ) {
# make a not-really-constant
*Pod::Simple::DEBUG = sub () { $$variable } ;
$$variable = $value;
print "# Starting Pod::Simple::DEBUG = non-constant $variable with val $value\n";
} else {
*Pod::Simple::DEBUG = eval " sub () { $value } ";
print "# Starting Pod::Simple::DEBUG = $value\n";
}

require Pod::Simple;
return;
}

1;


__END__

=head1 NAME

Pod::Simple::Debug -- put Pod::Simple into trace/debug mode

=head1 SYNOPSIS

use Pod::Simple::Debug (5); # or some integer

Or:

my $debuglevel;
use Pod::Simple::Debug (\$debuglevel, 0);
...some stuff that uses Pod::Simple to do stuff, but which
you don't want debug output from...

$debug_level = 4;
...some stuff that uses Pod::Simple to do stuff, but which
you DO want debug output from...

$debug_level = 0;

=head1 DESCRIPTION

This is an internal module for controlling the debug level (a.k.a. trace
level) of Pod::Simple. This is of interest only to Pod::Simple
developers.


=head1 CAVEATS

Note that you should load this module I<before> loading Pod::Simple (or
any Pod::Simple-based class). If you try loading Pod::Simple::Debug
after &Pod::Simple::DEBUG is already defined, Pod::Simple::Debug will
throw a fatal error to the effect that
"it's s too late to call Pod::Simple::Debug".

Note that the C<use Pod::Simple::Debug (\$x, I<somenum>)> mode will make
Pod::Simple (et al) run rather slower, since &Pod::Simple::DEBUG won't
be a constant sub anymore, and so Pod::Simple (et al) won't compile with
constant-folding.


=head1 GUTS

Doing this:

use Pod::Simple::Debug (5); # or some integer

is basically equivalent to:

BEGIN { sub Pod::Simple::DEBUG () {5} } # or some integer
use Pod::Simple ();

And this:

use Pod::Simple::Debug (\$debug_level,0); # or some integer

is basically equivalent to this:

my $debug_level;
BEGIN { $debug_level = 0 }
BEGIN { sub Pod::Simple::DEBUG () { $debug_level }
use Pod::Simple ();

=head1 SEE ALSO

L<Pod::Simple>

The article "Constants in Perl", in I<The Perl Journal> issue
21. See L<http://interglacial.com/tpj/21/>

=head1 SUPPORT

Questions or discussion about POD and Pod::Simple should be sent to the
[email protected] mail list. Send an empty email to
[email protected] to subscribe.

This module is managed in an open GitHub repository,
L<http://github.com/theory/pod-simple/>. Feel free to fork and contribute, or
to clone L<git://github.com/theory/pod-simple.git> and send patches!

Patches against Pod::Simple are welcome. Please send bug reports to
<[email protected]>.

=head1 COPYRIGHT AND DISCLAIMERS

Copyright (c) 2002 Sean M. Burke.

This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

This program is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose.

=head1 AUTHOR

Pod::Simple was created by Sean M. Burke <[email protected]>.
But don't bother him, he's retired.

Pod::Simple is maintained by:

=over

=item * Allison Randal C<[email protected]>

=item * Hans Dieter Pearcey C<[email protected]>

=item * David E. Wheeler C<[email protected]>

=back

=cut