package Perl::Critic::Policy::Modules::ProhibitMultiplePackages;

use 5.006001;
use strict;
use warnings;
use Readonly;

use Perl::Critic::Utils qw{ :severities };
use base 'Perl::Critic::Policy';

our $VERSION = '1.140';

#-----------------------------------------------------------------------------

Readonly::Scalar my $DESC   => q{Multiple "package" declarations};
Readonly::Scalar my $EXPL   => q{Limit to one per file};

#-----------------------------------------------------------------------------

sub supported_parameters { return ()              }
sub default_severity     { return $SEVERITY_HIGH  }
sub default_themes       { return qw( core bugs ) }
sub applies_to           { return 'PPI::Document' }

#-----------------------------------------------------------------------------

sub violates {
    my ( $self, $elem, $doc ) = @_;
    my $nodes_ref = $doc->find('PPI::Statement::Package');
    return if !$nodes_ref;
    my @matches = @{$nodes_ref} > 1 ? @{$nodes_ref}[ 1 .. $#{$nodes_ref} ] :();

    return map {$self->violation($DESC, $EXPL, $_)} @matches;
}

1;

__END__

#-----------------------------------------------------------------------------

=pod

=head1 NAME

Perl::Critic::Policy::Modules::ProhibitMultiplePackages - Put packages (especially subclasses) in separate files.


=head1 AFFILIATION

This Policy is part of the core L<Perl::Critic|Perl::Critic>
distribution.


=head1 DESCRIPTION

Conway doesn't specifically mention this, but I find it annoying when
there are multiple packages in the same file.  When searching for
methods or keywords in your editor, it makes it hard to find the right
chunk of code, especially if each package is a subclass of the same
base.


=head1 CONFIGURATION

This Policy is not configurable except for the standard options.


=head1 AUTHOR

Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>


=head1 COPYRIGHT

Copyright (c) 2005-2011 Imaginative Software Systems.  All rights reserved.

This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.  The full text of this license
can be found in the LICENSE file included with this module.

=cut

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