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, ... ) =item 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.