/usr/share/perl5/Debian/Dependency.pm is in dh-make-perl 0.80-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use strict;
use warnings;
our $VERSION = '0.77';
use AptPkg::Config;
use Carp;
use Dpkg::Version ();
use List::MoreUtils qw(mesh);
=head1 NAME
Debian::Dependency - dependency relationship between Debian packages
=head1 SYNOPSIS
# simple dependency
my $d = Debian::Dependency->new( 'perl' );
# also parses a single argument
my $d = Debian::Dependency->new('perl (>= 5.10)');
# dependency with a version
my $d = Debian::Dependency->new( 'perl', '5.10' );
# dependency with version and relation
my $d = Debian::Dependency->new( 'perl', '>=', '5.10' );
print $d->pkg; # 'perl'
print $d->ver; # '5.10'
# for people who like to type much
my $d = Debian::Dependency->new( { pkg => 'perl', ver => '5.10' } );
# stringification
print "$d" # 'perl (>= 5.10)'
# 'adding'
$deps = $dep1 + $dep2;
$deps = $dep1 + 'foo (>= 1.23)'
=cut
use base qw(Class::Accessor);
__PACKAGE__->mk_accessors(qw( pkg ver rel alternatives ));
use Carp;
use overload '""' => \&_stringify,
'+' => \&_add,
'<=>' => \&_compare;
=head2 CLASS_METHODS
=over 4
=item new()
Construct a new instance.
=item new( { pkg => 'package', rel => '>=', ver => '1.9' } )
If a hash reference is passed as an argument, its contents are used to
initialize the object.
=item new( [ { pkg => 'foo' }, 'bar (<= 3)' ] );
In an array reference is passed as an argument, its elements are used for
constructing a dependency with alternatives.
=item new('foo (= 42)')
=item new('foo (= 42) | bar')
If a single argument is given, the construction is passed to the C<parse>
constructor.
=item new( 'foo', '1.4' )
Two arguments are interpreted as package name and version. The relation is
assumed to be '>='.
=item new( 'foo', '=', '42' )
Three arguments are interpreted as package name, relation and version.
=cut
sub new {
my $class = shift;
$class = ref($class) if ref($class);
my $self = $class->SUPER::new();
my( $pkg, $rel, $ver );
if( ref($_[0]) and ref($_[0]) eq 'HASH' ) {
$pkg = delete $_[0]->{pkg};
$rel = delete $_[0]->{rel} // '>=';
$ver = delete $_[0]->{ver};
# pass-through the rest
while( my($k,$v) = each %{$_[0]} ) {
$self->$k($v);
}
}
elsif( ref($_[0]) and ref($_[0]) eq 'ARRAY' ) {
$self->alternatives(
[ map { $self->new($_) } @{ $_[0] } ],
);
for( @{ $self->alternatives } ) {
croak "Alternatives can't be nested"
if $_->alternatives;
}
return $self;
}
elsif( @_ == 1 ) {
return $class->parse($_[0]);
}
elsif( @_ == 2 ) {
$pkg = shift;
$rel = '>=';
$ver = shift;
}
elsif( @_ == 3 ) {
( $pkg, $rel, $ver ) = @_;
}
else {
die "Unsupported number of arguments";
}
$self->ver($ver);
unless( defined( $self->ver ) ) {
undef($rel);
delete $self->{ver};
};
if ($rel) {
$rel = '<=' if $rel eq '<';
$rel = '>=' if $rel eq '>';
$self->rel($rel);
}
croak "pkg is mandatory" unless $pkg or $self->alternatives;
$self->pkg($pkg);
return $self;
}
sub _stringify {
my $self = shift;
if( $self->alternatives ) {
return join( ' | ', @{ $self->alternatives } );
}
return (
$self->ver
? $self->pkg . ' (' . $self->rel . ' ' . $self->ver . ')'
: $self->pkg
);
}
sub _add {
my $left = shift;
my $right = shift;
my $mode = shift;
confess "cannot += Dependency. put Dependencies instance on the left instead" unless defined($mode);
return bless( [ $left ], 'Debian::Dependencies' ) + $right;
}
our %rel_order = (
'<<' => -2,
'<=' => -1,
'=' => 0,
'>=' => +1,
'>>' => +2,
);
sub _compare {
my( $left, $right ) = @_;
if( $left->alternatives ) {
if( $right->alternatives ) {
my @pairs = mesh(
@{ $left->alternatives }, @{ $right->alternatives },
);
while(@pairs) {
my( $l, $r ) = splice @pairs, 0, 2;
return -1 unless $l;
return 1 unless $r;
my $res = _compare( $l, $r );
return $res if $res;
}
return 0;
}
else {
my $res = _compare( $left->alternatives->[0], $right );
return $res if $res;
return 1;
}
}
else {
if( $right->alternatives ) {
my $res = _compare( $left, $right->alternatives->[0] );
return $res if $res;
return -1;
}
else {
# nothing, the code below compares two plain dependencies
}
}
my $res = $left->pkg cmp $right->pkg;
return $res if $res != 0;
return -1 if not defined( $left->ver ) and defined( $right->ver );
return +1 if defined( $left->ver ) and not defined( $right->ver );
return 0 unless $left->ver; # both have no version
$res = $left->ver <=> $right->ver;
return $res if $res != 0;
# same versions, compare relations
return $rel_order{ $left->rel } <=> $rel_order{ $right->rel };
}
=item set
Overrides the set method from L<Class::Accessor>. Used to convert zero versions
(for example I<0> or I<0.000>) to void versions.
=cut
sub set {
my( $self, $field, $value ) = @_;
undef($value)
if $field eq 'ver'
and defined($value)
and $value =~ /^0[0.]*$/;
$value = Dpkg::Version->new( $value, check => 1 )
if $field eq 'ver' and defined($value);
$self->SUPER::set( $field, $value );
}
=item parse()
Takes a single string argument and parses it.
Examples:
=over
=item perl
=item perl (>= 5.8)
=item libversion-perl (<< 3.4)
=back
=cut
sub parse {
my ( $class, $str ) = @_;
if( $str =~ /\|/ ) {
# alternative dependencies
return $class->new( {
alternatives => [
map { $class->new($_) } split( /\s*\|\s*/, $str )
],
} );
}
if ($str =~ m{
^ # start from the beginning
\s* # stray space
([^\(\s]+) # package name - no paren, no space
\s* # optional space
(?: # version is optional
\( # opening paren
( # various relations
<<
| <=
| =
| >=
| >>
| <
| >
)
\s* # optional space
(.+) # version
\) # closing paren
)?
\s* # optional space
(?: # architecture is optional
\[
(?:
!? # negation is optional
[^\s\]]+ # architecture name
(?:\s+|(?=\])) # whitespace or end
)+
\]
)?
$}x # done
)
{
return $class->new(
{ pkg => $1,
( ( defined($2) and defined($3) )
? ( rel => $2, ver => $3 )
: ()
)
}
);
}
else {
die "Unable to parse '$str'";
}
}
1;
=back
=head2 FIELDS
=over
=item pkg
Contains the name of the package that is depended upon
=item rel
Contains the relation of the dependency. May be any of '<<', '<=', '=', '>='
or '>>'. Default is '>='.
=item ver
Contains the version of the package the dependency is about. The value is an
instance of L<Dpkg::Version> class. If you set it to a scalar value, that is
given to L<Dpkg::Version>->new().
=back
C<rel> and C<ver> are either both present or both missing.
Examples
print $dep->pkg;
$dep->ver('3.4');
=head1 METHODS
=over
=item satisfies($dep)
Returns true if I<$dep> states a dependency that is already covered by this
instance. In other words, if this method returns true, any package satisfying
the dependency of this instance will also satisfy I<$dep> ($dep is redundant in
dependency lists where this instance is already present).
I<$dep> can be either an instance of the L<Debian::Dependency> class, or a
plain string.
my $dep = Debian::Dependency->new('foo (>= 2)');
print $dep->satisfies('foo') ? 'yes' : 'no'; # no
print $dep->satisfies('bar') ? 'yes' : 'no'; # no
print $dep->satisfies('foo (>= 2.1)') ? 'yes' : 'no'; # yes
=cut
sub satisfies {
my( $self, $dep ) = @_;
$dep = Debian::Dependency->new($dep)
unless ref($dep);
# we have alternatives? then we satisfy the dependency only if
# all of the alternatives satisfy it
if( $self->alternatives ) {
for( @{ $self->alternatives } ) {
return 0 unless $_->satisfies($dep);
}
return 1;
}
# $dep has alternatives? then we satisfy it if we satisfy any of them
if( $dep->alternatives ) {
for( @{ $dep->alternatives } ) {
return 1 if $self->satisfies($_);
}
return 0;
}
# different package?
return 0 unless $self->pkg eq $dep->pkg;
# $dep has no relation?
return 1 unless $dep->rel;
# $dep has relation, but we don't?
return 0 if not $self->rel;
# from this point below both $dep and we have relation (and version)
my $cmpver = ( $self->ver <=> $dep->ver );
if( $self->rel eq '>>' ) {
# >> 4 satisfies also >> 3
return 1 if $dep->rel eq '>>'
and $cmpver >= 0;
# >> 4 satisfies >= 3 and >= 4
return 1 if $dep->rel eq '>='
and $cmpver >= 0;
# >> 4 can't satisfy =, <= and << relations
return 0;
}
elsif( $self->rel eq '>=' ) {
# >= 4 satisfies >= 3
return 1 if $dep->rel eq '>='
and $cmpver >= 0;
# >= 4 satisvies >> 3, but not >> 4
return 1 if $dep->rel eq '>>'
and $cmpver > 0;
# >= 4 can't satosfy =, <= and << relations
}
elsif( $self->rel eq '=' ) {
return 1 if $dep->rel eq '='
and $cmpver == 0;
# = 4 also satisfies >= 3 and >= 4
return 1 if $dep->rel eq '>='
and $cmpver >= 0;
# = 4 satisfies >> 3, but not >> 4
return 1 if $dep->rel eq '>>'
and $cmpver > 0;
# = 4 satisfies <= 4 and <= 5
return 1 if $dep->rel eq '<='
and $cmpver <= 0;
# = 4 satisfies << 5, but not << 4
return 1 if $dep->rel eq '<<'
and $cmpver < 0;
# other cases mean 'no'
return 0;
}
elsif( $self->rel eq '<=' ) {
# <= 4 satisfies <= 5
return 1 if $dep->rel eq '<='
and $cmpver <= 0;
# <= 4 satisfies << 5, but not << 4
return 1 if $dep->rel eq '<<'
and $cmpver < 0;
# <= 4 can't satisfy =, >= and >>
return 0;
}
elsif( $self->rel eq '<<' ) {
# << 4 satisfies << 5
return 1 if $dep->rel eq '<<'
and $cmpver <= 0;
# << 4 satisfies <= 5 and <= 4
return 1 if $dep->rel eq '<='
and $cmpver <= 0;
# << 4 can't satisfy =, >= and >>
return 0;
}
else {
croak "Should not happen: $self satisfies $dep?";
}
}
=back
=head1 SEE ALSO
L<Debian::Dependencies>
=head1 AUTHOR
=over 4
=item Damyan Ivanov <dmn@debian.org>
=back
=head1 COPYRIGHT & LICENSE
=over 4
=item Copyright (C) 2008,2009,2010 Damyan Ivanov <dmn@debian.org>
=back
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License version 2 as published by the Free
Software Foundation.
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.
=cut
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