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package Acme::emcA;

use 5.004;
use strict qw[vars subs];
use vars '$VERSION';

$VERSION = '0.10E0';

open 0 or print "Can't reverse '$0'\n" and exit;
( my $code = join "", <0> ) =~ s/.*?^(\s*);?use\s+Acme::emcA\s*(?: esu)?;\n//sm;
my $max = 10 + length $1;
local $SIG{__WARN__} = \&is_forward;
do { eval forward($code); exit } if is_backward($code);
open 0, ">$0" or print "Can't reverse '$0'\n" and exit;
$max  = 10;
$code = backward($code);
$code =
    ( " " x ( $max - 10 ) )
  . ";use Acme::emcA esu;\n"
  . ( " " x ( $max * 2 ) ) . "\n"
  . $code;
print {0} $code . ( join( "\n", reverse split( /\n/, $code ) ) ), "\n" and exit;

sub forward {
    join( "\n",
        map substr( $_, $max ),
        ( split "\n", substr( $_[0], 0, length( $_[0] ) / 2 ) ) );
}

sub is_forward { $_[0] !~ /^ {20,}$/m }
sub is_backward { $_[0] =~ s/\n?.*$// if $_[0] =~ /^ {20,}$/m }

sub backward {
    @_ = split "\n", $_[0];
    length > $max && ( $max = length ) for @_;
    return join "\n", map sprintf( "%${max}s", scalar reverse $_ ) . $_, @_, '';
}

1;

__END__

=head1 NAME

Acme::emcA - Acme::emcA

=head1 VERSION

This document describes version 0.10E0 of Acme::emcA, released
December 24, 2007.

=head1 SYNOPSIS

    use Acme::emcA;
    print "Hello, World";

=head1 DESCRIPTION

The first time you run a program under C<use Acme::emcA>, the module takes
your source file and makes an mirror image of it at both row- and column-
level.  The code continues to work exactly as it did before, but now it looks
like this:

		;use Acme::emcA esu;

    ;"!dlroW ,olleH" tnirpprint "Hello, World!";

    ;"!dlroW ,olleH" tnirpprint "Hello, World!";

		;use Acme::emcA esu;

=head1 DIAGNOSTICS

=over 4

=item C<Can't reverse "%s">

Acme::emcA could not access the source file to modify it.

=head1 SEE ALSO

L<Acme::Palindrome> - Code and documentation nearly taken verbatim from it.

=head1 COPYRIGHT

Copyright 2003, 2005, 2007 by Audrey Tang E<lt>cpan@audreyt.orgE<gt>.

This software is released under the MIT license cited below.

=head2 The "MIT" License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell