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# Copyright Colin Watson <cjwatson@debian.org>
# Copyright Ian Jackson <iwj@debian.org>
# Copyright 2007 by Don Armstrong <don@donarmstrong.com>.
# 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
package Dpkg::Version;
use strict;
use warnings;
use Dpkg::ErrorHandling qw(error);
use Dpkg::Gettext;
use Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(vercmp compare_versions check_version parseversion);
=head1 NAME
Dpkg::Version - pure-Perl dpkg-style version comparison
=head1 DESCRIPTION
The Dpkg::Version module provides pure-Perl routines to compare
dpkg-style version numbers, as used in Debian packages. If you have the
libapt-pkg Perl bindings available (Debian package libapt-pkg-perl), they
may offer better performance.
=head1 METHODS
=over 8
=cut
sub parseversion ($)
{
my $ver = shift;
my %verhash;
if ($ver =~ /:/)
{
$ver =~ /^(\d+):(.+)/ or die "bad version number '$ver'";
$verhash{epoch} = $1;
$ver = $2;
}
else
{
$verhash{epoch} = 0;
}
if ($ver =~ /(.+)-(.+)$/)
{
$verhash{version} = $1;
$verhash{revision} = $2;
}
else
{
$verhash{version} = $ver;
$verhash{revision} = 0;
}
return %verhash;
}
# verrevcmp
# This function is almost exactly equivalent
# to dpkg's verrevcmp function, including the
# order subroutine which it uses.
sub verrevcmp($$)
{
sub order{
my ($x) = @_;
##define order(x) ((x) == '~' ? -1 \
# : cisdigit((x)) ? 0 \
# : !(x) ? 0 \
# : cisalpha((x)) ? (x) \
# : (x) + 256)
# This comparison is out of dpkg's order to avoid
# comparing things to undef and triggering warnings.
if (not defined $x) {
return 0;
}
elsif ($x eq '~') {
return -1;
}
elsif ($x =~ /^\d$/) {
return 0;
}
elsif ($x =~ /^[A-Z]$/i) {
return ord($x);
}
else {
return ord($x) + 256;
}
}
sub next_elem(\@){
my $a = shift;
return @{$a} ? shift @{$a} : undef;
}
my ($val, $ref) = @_;
$val = "" if not defined $val;
$ref = "" if not defined $ref;
my @val = split //,$val;
my @ref = split //,$ref;
my $vc = next_elem @val;
my $rc = next_elem @ref;
while (defined $vc or defined $rc) {
my $first_diff = 0;
while ((defined $vc and $vc !~ /^\d$/) or
(defined $rc and $rc !~ /^\d$/)) {
my $vo = order($vc); my $ro = order($rc);
# Unlike dpkg's verrevcmp, we only return 1 or -1 here.
return (($vo - $ro > 0) ? 1 : -1) if $vo != $ro;
$vc = next_elem @val; $rc = next_elem @ref;
}
while (defined $vc and $vc eq '0') {
$vc = next_elem @val;
}
while (defined $rc and $rc eq '0') {
$rc = next_elem @ref;
}
while (defined $vc and $vc =~ /^\d$/ and
defined $rc and $rc =~ /^\d$/) {
$first_diff = ord($vc) - ord($rc) if !$first_diff;
$vc = next_elem @val; $rc = next_elem @ref;
}
return 1 if defined $vc and $vc =~ /^\d$/;
return -1 if defined $rc and $rc =~ /^\d$/;
return $first_diff if $first_diff;
}
return 0;
}
=item vercmp
Compare the two arguments as dpkg-style version numbers. Returns -1 if the
first argument represents a lower version number than the second, 1 if the
first argument represents a higher version number than the second, and 0 if
the two arguments represent equal version numbers.
=cut
sub vercmp ($$)
{
my %version = parseversion $_[0];
my %refversion = parseversion $_[1];
return 1 if $version{epoch} > $refversion{epoch};
return -1 if $version{epoch} < $refversion{epoch};
my $r = verrevcmp($version{version}, $refversion{version});
return $r if $r;
return verrevcmp($version{revision}, $refversion{revision});
}
=item compare_versions
Emulates dpkg --compare-versions. Takes two versions as arguments
one and three and one operator as argument two. Supports the following
operators: 'gt', 'ge', 'eq', 'le', 'lt', and '>>', '>=', '=', '<=', '<<'.
Returns a true value if the specified condition is true, a false value
otherwise.
=cut
sub compare_versions ($$$)
{
my $rel = $_[1];
my $res = vercmp($_[0], $_[2]);
if ($rel eq 'gt' or $rel eq ">" or $rel eq ">>") {
return $res > 0;
} elsif ($rel eq 'ge' or $rel eq '>=') {
return $res >= 0;
} elsif ($rel eq 'eq' or $rel eq '=') {
return $res == 0;
} elsif ($rel eq 'le' or $rel eq '<=') {
return $res <= 0;
} elsif ($rel eq 'lt' or $rel eq "<" or $rel eq "<<") {
return $res < 0;
} else {
die "bad relation '$rel'";
}
}
=item check_version($version)
Check the version string and fails it it's invalid.
=cut
sub check_version ($) {
my $version = shift || '';
$version =~ m/[^-+:.0-9a-zA-Z~]/o &&
error(_g("version number contains illegal character `%s'"), $&);
}
=back
=head1 AUTHOR
Don Armstrong <don@donarmstrong.com> and Colin Watson
E<lt>cjwatson@debian.orgE<gt>, based on the implementation in
C<dpkg/lib/vercmp.c> by Ian Jackson and others.
=cut
1;
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