/usr/share/perl5/Hash/Diff.pm is in libhash-diff-perl 0.005-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | package Hash::Diff;
use strict;
use warnings;
use Carp;
use Hash::Merge;
use base 'Exporter';
use vars qw($VERSION @ISA @EXPORT_OK %EXPORT_TAGS);
$VERSION = 0.005;
@EXPORT_OK = qw( diff left_diff );
sub left_diff {
my ($h1, $h2) = @_;
my $rh = {};
foreach my $k (keys %{$h1}) {
if (ref $h1->{$k} eq 'HASH') {
if (ref $h2->{$k} eq 'HASH') {
$rh->{$k} = left_diff($h1->{$k}, $h2->{$k});
}
else {
$rh->{$k} = $h1->{$k}
}
}
elsif ((!defined $h2->{$k})||($h1->{$k} ne $h2->{$k})) {
$rh->{$k} = $h1->{$k}
}
}
return $rh;
}
sub diff {
my ($h1, $h2) = @_;
return Hash::Merge::merge(left_diff($h1,$h2),left_diff($h2,$h1));
}
1;
__END__
=head1 NAME
Hash::Diff - Return difference between two hashes as a hash
=head1 SYNOPSIS
use Hash::Diff qw( diff );
my %a = (
'foo' => 1,
'bar' => { a => 1, b => 1 },
);
my %b = (
'foo' => 2,
'bar' => { a => 1 },
);
my %c = %{ diff( \%a, \%b ) };
# %c = %{ foo => 1, bar => { b => 1} }
=head1 DESCRIPTION
Hash::Diff returns the difference between two hashes as a hash.
=over
=item diff ( <hashref>, <hashref> )
Diffs two hashes. Returns a reference to the new hash.
=item left_diff ( <hashref>, <hashref> )
Returns the values in the left hash that is not, or different from the right hash.
=back
=head1 CAVEATS
This will not handle self-referencing/recursion within hashes well.
This will only handle HASH and SCALAR.
Plans for a future version include incorporate deep recursion protection.
And support for ARRAY.
=head1 BUGS
Sure!
Report here: http://rt.cpan.org/NoAuth/Bugs.html?Dist=Hash::Diff
=head1 AUTHOR
Bjorn-Olav Strand E<lt>bo@startsiden.noE<gt>
=head1 COPYRIGHT
Copyright (c) 2010 ABC Startsiden AS. All rights reserved.
This library is free software. You can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
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