NAME

       Debian::Dependencies - a list of Debian::Dependency objects

SYNOPSIS

           my $dl = Debian::Dependencies->new('perl, libfoo-perl (>= 3.4)');
           print $dl->[1]->ver;      # 3.4
           print $dl->[1];           # libfoo-perl (>= 3.4)
           print $dl;                # perl, libfoo-perl (>= 3.4)

           $dl += 'libbar-perl';
           print $dl;                # perl, libfoo-perl (>= 3.4), libbar-perl

           print Debian::Dependencies->new('perl') + 'libfoo-bar-perl';
                                     # simple 'sum'

           print Debian::Dependencies->new('perl')
                 + Debian::Dependencies->new('libfoo, libbar');
                                     # add (concatenate) two lists

           print Debian::Dependencies->new('perl')
                 + Debian::Dependency->new('foo');
                                     # add dependency to a list

DESCRIPTION

       Debian::Dependencies a list of Debian::Dependency objects, with automatic construction and
       stringification.

       Objects of this class are blessed array references. You can safely treat them as arrayrefs, as long as
       the elements you put in them are instances of the Debian::Dependency class.

       When used in string context, Debian::Dependencies converts itself into a comma-delimited list of
       dependencies, suitable for dependency fields of debian/control files.

   CLASS METHODS
       new(dependency-string)
           Constructs a new Debian::Dependencies object. Accepts one scalar argument, which is parsed and turned
           into an arrayref of Debian::Dependency objects.  Each dependency should be delimited by a comma and
           optional space. The exact regular expression is "/\s*,\s*/".

   OBJECT METHODS
       add( dependency[, ... ] )
           Adds dependency (or a list of) to the list of dependencies. If the new dependency is a subset of or
           overlaps some of the old dependencies, it is not duplicated.

               my $d = Debian::Dependencies('foo, bar (<=4)');
               $d->add('foo (>= 4), bar');
               print "$d";     # foo (>= 4), bar (>= 4)

           dependency can be either a Debian::Dependency object, a Debian::Deendencies object, or a string (in
           which case it is converted to an instance of the Debian::Dependencies class).

       remove( dependency, ... )
       remove( dependencies, ... )
           Removes a dependency from the list of dependencies. Instances of Debian::Dependency and
           Debian::Dependencies classes are supported as arguments.

           Any non-reference arguments are coerced to instances of Debian::Dependencies class.

           Only dependencies that are subset of the given dependencies are removed:

               my $deps = Debian::Dependencies->new('foo (>= 1.2), bar');
               $deps->remove('foo, bar (>= 2.0)');
               print $deps;    # bar

           Returns the list of the dependencies removed.

       has( dep )
           Return true if the dependency list contains given dependency. In other words, this returns true if
           the list of dependencies guarantees that the given dependency will be satisfied. For example, "foo,
           bar" satisfies "foo", but not "foo (>= 5)".

       prune()
           This method is deprecated. If you want to sort the dependency list, either call "sort" or use normal
           perl sorting stuff on the dereferenced array.

       sort()
           Sorts the dependency list by package name, version and relation.

SEE ALSO

       Debian::Dependency

AUTHOR

       Damyan Ivanov <dmn@debian.org>

COPYRIGHT & LICENSE

       Copyright (C) 2008, 2009, 2010 Damyan Ivanov <dmn@debian.org>
       Copyright (C) 2009 gregor herrmann <gregoa@debian.org>

       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.