This file is indexed.

/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.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
package Debian::Dependency;

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