package Pod::Simple::Debug; use strict; our $VERSION = '3.45'; sub import { my($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 STDERR "# Starting Pod::Simple::DEBUG = non-constant $variable with val $value\n"; } else { *Pod::Simple::DEBUG = eval " sub () { $value } "; print STDERR "# 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 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 too late to call Pod::Simple::Debug". Note that the C)> 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 The article "Constants in Perl", in I issue 21. See L =head1 SUPPORT Questions or discussion about POD and Pod::Simple should be sent to the pod-people@perl.org mail list. Send an empty email to pod-people-subscribe@perl.org to subscribe. This module is managed in an open GitHub repository, L. Feel free to fork and contribute, or to clone L and send patches! Patches against Pod::Simple are welcome. Please send bug reports to . =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 . But don't bother him, he's retired. Pod::Simple is maintained by: =over =item * Allison Randal C =item * Hans Dieter Pearcey C =item * David E. Wheeler C =back =cut use warnings;