FM / Deps

/usr/share/perl5/Dpkg/Deps

Name	Size	Mode	Actions
AND.pm	4711	0644	edit dl rm
KnownFacts.pm	5772	0644	edit dl rm
Multiple.pm	5128	0644	edit dl rm
OR.pm	4329	0644	edit dl rm
Simple.pm	18383	0644	edit dl rm
Union.pm	2511	0644	edit dl rm

Edit: /usr/share/perl5/Dpkg/Deps/OR.pm (4329B)

# Copyright © 1998 Richard Braakman
# Copyright © 1999 Darren Benham
# Copyright © 2000 Sean 'Shaleh' Perry
# Copyright © 2004 Frank Lichtenheld
# Copyright © 2006 Russ Allbery
# Copyright © 2007-2009 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2008-2009, 2012-2014 Guillem Jover <guillem@debian.org>
#
# This program is free software; you may 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 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, see <https://www.gnu.org/licenses/>.

package Dpkg::Deps::OR;

=encoding utf8

=head1 NAME

Dpkg::Deps::OR - list of OR dependencies

=head1 DESCRIPTION

This class represents a list of dependencies of which only one must be met
for the dependency to be true. It inherits from Dpkg::Deps::Multiple.

=cut

use strict;
use warnings;

our $VERSION = '1.00';

use parent qw(Dpkg::Deps::Multiple);

=head1 METHODS

=over 4

=item $dep->output([$fh])

The output method uses " | " to join the list of sub-dependencies.

=cut

sub output {
    my ($self, $fh) = @_;

my $res = join(' | ', map {
        $_->output()
    } grep {
        not $_->is_empty()
    } $self->get_deps());

if (defined $fh) {
        print { $fh } $res;
    }
    return $res;
}

=item $dep->implies($other_dep)

Returns 1 when $dep implies $other_dep. Returns 0 when $dep implies
NOT($other_dep). Returns undef when there's no implication. $dep and
$other_dep do not need to be of the same type.

=cut

sub implies {
    my ($self, $o) = @_;

# Special case for AND with a single member, replace it by its member
    if ($o->isa('Dpkg::Deps::AND')) {
        my @subdeps = $o->get_deps();
        if (scalar(@subdeps) == 1) {
            $o = $subdeps[0];
        }
    }

# In general, an OR dependency can't imply anything except if each
    # of its member implies a member in the other OR dependency
    if ($o->isa('Dpkg::Deps::OR')) {
        my $subset = 1;
        foreach my $dep ($self->get_deps()) {
            my $found = 0;
            foreach my $odep ($o->get_deps()) {
                $found = 1 if $dep->implies($odep);
            }
            $subset = 0 if not $found;
        }
        return 1 if $subset;
    }
    return;
}

=item $dep->get_evaluation($facts)

Evaluates the dependency given a list of installed packages and a list of
virtual packages provided. These lists are part of the Dpkg::Deps::KnownFacts
object given as parameters.

Returns 1 when it's true, 0 when it's false, undef when some information
is lacking to conclude.

=cut

sub get_evaluation {
    my ($self, $facts) = @_;

# Returns false if all members evaluates to 0
    # Returns true if at least one member evaluates to true
    # Returns undef otherwise
    my $result = 0;
    foreach my $dep ($self->get_deps()) {
        my $eval = $dep->get_evaluation($facts);
        if (not defined $eval) {
            $result = undef;
        } elsif ($eval == 1) {
            $result = 1;
            last;
        } elsif ($eval == 0) {
            # Still possible to have a false evaluation
        }
    }
    return $result;
}

=item $dep->simplify_deps($facts, @assumed_deps)

Simplifies the dependency as much as possible given the list of facts (see
object Dpkg::Deps::KnownFacts) and a list of other dependencies that are
known to be true.

=cut

sub simplify_deps {
    my ($self, $facts) = @_;
    my @new;

WHILELOOP:
    while (@{$self->{list}}) {
        my $dep = shift @{$self->{list}};
        my $eval = $dep->get_evaluation($facts);
        if (defined $eval and $eval == 1) {
            $self->{list} = [];
            return;
        }
        foreach my $odep (@new, @{$self->{list}}) {
            next WHILELOOP if $odep->implies($dep);
        }
        push @new, $dep;
    }
    $self->{list} = [ @new ];
}

=back

=head1 CHANGES

=head2 Version 1.00 (dpkg 1.15.6)

Mark the module as public.

=cut

cmd: