package Perl::Critic::Policy::Subroutines::ProhibitNestedSubs;

use 5.010001;
use strict;
use warnings;
use Readonly;

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

our $VERSION = '1.156';

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

Readonly::Scalar my $DESC => q{Nested named subroutine};
Readonly::Scalar my $EXPL =>
    q{Declaring a named sub inside another named sub does not prevent the }
        . q{inner sub from being global};

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

sub supported_parameters { return ()                    }
sub default_severity     { return $SEVERITY_HIGHEST     }
sub default_themes       { return qw(core bugs)         }
sub applies_to           { return 'PPI::Statement::Sub' }

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

sub violates {
    my ($self, $elem, undef) = @_;

    return if $elem->isa('PPI::Statement::Scheduled') || defined $elem->type;

    my $outer = $elem;
    while ($outer = $outer->parent) {
        last if $outer->isa('PPI::Statement::Sub')
            &&  ! $outer->isa('PPI::Statement::Scheduled');
    }
    return if not $outer;

    # Must be a violation...
    return $self->violation($DESC, $EXPL, $elem);
}

1;

__END__

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

=pod

=for stopwords RJBS SIGNES

=head1 NAME

Perl::Critic::Policy::Subroutines::ProhibitNestedSubs - C<sub never { sub correct {} }>.

=head1 AFFILIATION

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


=head1 DESCRIPTION

B<Attention would-be clever Perl writers (including Younger RJBS):>

This does not do what you think:

  sub do_something {
      ...
      sub do_subprocess {
          ...
      }
      ...
  }

C<do_subprocess()> is global, despite where it is declared.  Either
write your subs without nesting or use anonymous code references.



=head1 CONFIGURATION

This Policy is not configurable except for the standard options.


=head1 NOTE

Originally part of L<Perl::Critic::Tics|Perl::Critic::Tics>.


=head1 AUTHOR

Ricardo SIGNES <rjbs@cpan.org>

=head1 COPYRIGHT

Copyright (c) 2007-2011 Ricardo SIGNES.

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

=cut

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