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#
# DebVersions
# $Id: Versions.pm,v 1.1 2003/12/22 00:32:15 djpig Exp $
#
# Copyright 2003 Frank Lichtenheld <frank@lichtenheld.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
=head1 NAME
DebVersions - compare Versions of Debian packages
=head1 SYNOPSIS
use DebVersions
my $res = version_cmp( "1:0.2.2-2woody1", "1:0.2.3-7" );
my @sorted = version_sort( "1:0.2.2-2woody1", "1:0.2.3-7", "2:0.1.1" );
=head1 DESCRIPTION
This module allows you to compare version numbers like defined
in the Debian policy, section 3.2 (L<SEE ALSO>).
It provides two functions:
=over 4
=item *
version_cmp() gets two version strings as parameters and returns
-1, if the first is lower than the second, 0 if equal, 1 if greater.
You can use this function as first parameter for the sort() function.
=item *
version_sort() is just an usefull abbrevation for
sort { version_cmp( $b, $a ) } @_;
=back
=head1 EXPORTS
By default, DebVersions exports version_cmp() and version_sort().
=cut
package DebVersions;
use strict;
use Exporter;
our @ISA = qw( Exporter );
our @EXPORT = qw( version_cmp version_sort );
sub version_cmp {
my ( $ver1, $ver2 ) = @_;
my ( $e1, $e2, $u1, $u2, $d1, $d2 );
my $re = qr/^(?:(\d):)?(.*?)(?:-([\w+.]+))?$/;
if ( $ver1 =~ $re ) {
( $e1, $u1, $d1 ) = ( $1, $2, $3 );
$e1 ||= 0;
} else {
warn "This seems not to be a valid version number:"
. "<$ver1>\n";
return -1;
}
if ( $ver2 =~ $re ) {
( $e2, $u2, $d2 ) = ( $1, $2, $3 );
$e2 ||= 0;
} else {
warn "This seems not to be a valid version number:"
. "<$ver2>\n";
return 1;
}
# warn "D: <$e1><$u1><$d1> <=> <$e2><$u2><$d2>\n";
if ( $e1 <=> $e2 ) {
return $e1 <=> $e2;
}
my $res = 0;
$res = _cmp_part ( $u1, $u2 );
return $res if $res;
$res = _cmp_part ( $d1, $d2 );
return $res if $res;
return 0;
}
sub version_sort {
return sort { version_cmp( $b, $a ) } @_;
}
sub _cmp_part {
my ( $v1, $v2 ) = @_;
while ( $v1 && $v2 ) {
$v1 =~ s/^(\D*)//o;
my $sp1 = $1;
$v2 =~ s/^(\D*)//o;
my $sp2 = $1;
# warn "$sp1 cmp $sp2 = "._lcmp( $sp1,$sp2)."\n";
if ( my $r = _lcmp( $sp1, $sp2 ) ) {
return $r;
}
$v1 =~ s/^(\d*)//o;
my $np1 = $1;
$v2 =~ s/^(\d*)//o;
my $np2 = $1;
# warn "$np1 <=> $np2 = ".($np1 <=> $np2)."\n";
if ( $np1 <=> $np2 ) {
return $np1 <=> $np2;
}
}
if ( $v1 || $v2 ) {
return $v1 ? 1 : -1;
}
}
sub _lcmp {
my ( $v1, $v2 ) = @_;
for ( my $i = 0; $i < length( $v1 ); $i++ ) {
my ( $n1, $n2 ) = ( ord( substr( $v1, $i, 1 ) ),
ord( substr( $v2, $i, 1 ) ) );
$n1 += 100 if $n1 < 65;
$n2 += 100 if $n2 < 65;
if ( $n1 <=> $n2 ) {
return $n1 <=> $n2;
}
}
return length( $v1 ) <=> length( $v2 );
}
1;
__END__
=head1 COPYRIGHT
Copyright 2003 Frank Lichtenheld <frank@lichtenheld.de>
This file is distributed under the terms of the GNU Public
License, Version 2. See the source code for more details.
=head1 SEE ALSO
Debian policy <URL:http://www..debian.org/doc/debian-policy/>
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