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Util.pm
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package Alien::Util; use strict; use warnings; use Exporter qw( import ); # ABSTRACT: Alien Utilities used at build and runtime our $VERSION = '2.80'; # VERSION our @EXPORT_OK = qw( version_cmp ); # Sort::Versions isn't quite the same algorithm because it differs in # behaviour with leading zeroes. # See also https://dev.gentoo.org/~mgorny/pkg-config-spec.html#version-comparison sub version_cmp { my @x = (shift =~ m/([0-9]+|[a-z]+)/ig); my @y = (shift =~ m/([0-9]+|[a-z]+)/ig); while(@x and @y) { my $x = shift @x; my $x_isnum = $x =~ m/[0-9]/; my $y = shift @y; my $y_isnum = $y =~ m/[0-9]/; if($x_isnum and $y_isnum) { # Numerical comparison return $x <=> $y if $x != $y; } elsif(!$x_isnum && !$y_isnum) { # Alphabetic comparison return $x cmp $y if $x ne $y; } else { # Of differing types, the numeric one is newer return $x_isnum - $y_isnum; } } # Equal so far; the longer is newer return @x <=> @y; } 1; __END__ =pod =encoding UTF-8 =head1 NAME Alien::Util - Alien Utilities used at build and runtime =head1 VERSION version 2.80 =head1 SYNOPSIS use Alien::Util qw( version_cmp ); =head1 DESCRIPTION This module contains some functions used by both the L<Alien::Build> build-time and <Alien::Base> run-time for Alien. =head2 version_cmp $cmp = version_cmp($x, $y) Comparison method used by L<Alien::Base/atleast_version>, L<Alien::Base/exact_version> and L<Alien::Base/max_version>. May be useful to implement custom comparisons, or for subclasses to overload to get different version comparison semantics than the default rules, for packages that have some other rules than the F<pkg-config> behaviour. Should return a number less than, equal to, or greater than zero; similar in behaviour to the C<< <=> >> and C<cmp> operators. =head1 SEE ALSO L<Alien::Base>, L<alienfile>, L<Alien::Build> =head1 AUTHOR Author: Graham Ollis E<lt>plicease@cpan.orgE<gt> Contributors: Diab Jerius (DJERIUS) Roy Storey (KIWIROY) Ilya Pavlov David Mertens (run4flat) Mark Nunberg (mordy, mnunberg) Christian Walde (Mithaldu) Brian Wightman (MidLifeXis) Zaki Mughal (zmughal) mohawk (mohawk2, ETJ) Vikas N Kumar (vikasnkumar) Flavio Poletti (polettix) Salvador Fandiño (salva) Gianni Ceccarelli (dakkar) Pavel Shaydo (zwon, trinitum) Kang-min Liu (劉康民, gugod) Nicholas Shipp (nshp) Juan Julián Merelo Guervós (JJ) Joel Berger (JBERGER) Petr Písař (ppisar) Lance Wicks (LANCEW) Ahmad Fatoum (a3f, ATHREEF) José Joaquín Atria (JJATRIA) Duke Leto (LETO) Shoichi Kaji (SKAJI) Shawn Laffan (SLAFFAN) Paul Evans (leonerd, PEVANS) Håkon Hægland (hakonhagland, HAKONH) nick nauwelaerts (INPHOBIA) Florian Weimer =head1 COPYRIGHT AND LICENSE This software is copyright (c) 2011-2022 by Graham Ollis. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =cut