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.\" ========================================================================
.\"
.IX Title "Debian::Dependency 3pm"
.TH Debian::Dependency 3pm "2019-02-28" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Debian::Dependency \- dependency relationship between Debian packages
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 8
\&                                    # simple dependency
\&   my $d = Debian::Dependency\->new( \*(Aqperl\*(Aq );
\&                                    # also parses a single argument
\&   my $d = Debian::Dependency\->new(\*(Aqperl (>= 5.10)\*(Aq);
\&                                    # dependency with a version
\&   my $d = Debian::Dependency\->new( \*(Aqperl\*(Aq, \*(Aq5.10\*(Aq );
\&                                    # dependency with version and relation
\&   my $d = Debian::Dependency\->new( \*(Aqperl\*(Aq, \*(Aq>=\*(Aq, \*(Aq5.10\*(Aq );
\&
\&   print $d\->pkg;  # \*(Aqperl\*(Aq
\&   print $d\->ver;  # \*(Aq5.10\*(Aq
\&
\&                                    # for people who like to type much
\&   my $d = Debian::Dependency\->new( { pkg => \*(Aqperl\*(Aq, ver => \*(Aq5.10\*(Aq } );
\&
\&   # stringification
\&   print "$d"      # \*(Aqperl (>= 5.10)\*(Aq
\&
\&   # \*(Aqadding\*(Aq
\&   $deps = $dep1 + $dep2;
\&   $deps = $dep1 + \*(Aqfoo (>= 1.23)\*(Aq
.Ve
.SS "\s-1CLASS_METHODS\s0"
.IX Subsection "CLASS_METHODS"
.IP "\fBnew()\fR" 4
.IX Item "new()"
Construct a new instance.
.IP "new( { pkg => 'package', rel => '>=', ver => '1.9' } )" 4
.IX 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.
.IP "new( [ { pkg => 'foo' }, 'bar (<= 3)' ] );" 4
.IX 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.
.IP "new('foo (= 42)')" 4
.IX Item "new('foo (= 42)')"
.PD 0
.IP "new('foo (= 42) | bar')" 4
.IX Item "new('foo (= 42) | bar')"
.PD
If a single argument is given, the construction is passed to the \f(CW\*(C`parse\*(C'\fR
constructor.
.IP "new( 'foo', '1.4' )" 4
.IX Item "new( 'foo', '1.4' )"
Two arguments are interpreted as package name and version. The relation is
assumed to be '>='.
.IP "new( 'foo', '=', '42' )" 4
.IX Item "new( 'foo', '=', '42' )"
Three arguments are interpreted as package name, relation and version.
.IP "set" 4
.IX Item "set"
Overrides the set method from Class::Accessor. Used to convert zero versions
(for example \fI0\fR or \fI0.000\fR) to void versions.
.IP "\fBparse()\fR" 4
.IX Item "parse()"
Takes a single string argument and parses it.
.Sp
Examples:
.RS 4
.IP "perl" 4
.IX Item "perl"
.PD 0
.IP "perl (>= 5.8)" 4
.IX Item "perl (>= 5.8)"
.IP "libversion-perl (<< 3.4)" 4
.IX Item "libversion-perl (<< 3.4)"
.RE
.RS 4
.RE
.PD
.SS "\s-1FIELDS\s0"
.IX Subsection "FIELDS"
.IP "pkg" 4
.IX Item "pkg"
Contains the name of the package that is depended upon
.IP "rel" 4
.IX Item "rel"
Contains the relation of the dependency. May be any of '<<', '<=', '=', '>='
or '>>'. Default is '>='.
.IP "ver" 4
.IX Item "ver"
Contains the version of the package the dependency is about. The value is an
instance of Dpkg::Version class. If you set it to a scalar value, that is
given to Dpkg::Version\->\fBnew()\fR.
.PP
\&\f(CW\*(C`rel\*(C'\fR and \f(CW\*(C`ver\*(C'\fR are either both present or both missing.
.PP
Examples
.PP
.Vb 2
\&    print $dep\->pkg;
\&    $dep\->ver(\*(Aq3.4\*(Aq);
.Ve
.SH "METHODS"
.IX Header "METHODS"
.IP "satisfies($dep)" 4
.IX Item "satisfies($dep)"
Returns true if \fI\f(CI$dep\fI\fR 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 \fI\f(CI$dep\fI\fR ($dep is redundant in
dependency lists where this instance is already present).
.Sp
\&\fI\f(CI$dep\fI\fR can be either an instance of the Debian::Dependency class, or a
plain string.
.Sp
.Vb 4
\&    my $dep  = Debian::Dependency\->new(\*(Aqfoo (>= 2)\*(Aq);
\&    print $dep\->satisfies(\*(Aqfoo\*(Aq) ? \*(Aqyes\*(Aq : \*(Aqno\*(Aq;             # no
\&    print $dep\->satisfies(\*(Aqbar\*(Aq) ? \*(Aqyes\*(Aq : \*(Aqno\*(Aq;             # no
\&    print $dep\->satisfies(\*(Aqfoo (>= 2.1)\*(Aq) ? \*(Aqyes\*(Aq : \*(Aqno\*(Aq;    # yes
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Debian::Dependencies
.SH "AUTHOR"
.IX Header "AUTHOR"
.IP "Damyan Ivanov <dmn@debian.org>" 4
.IX Item "Damyan Ivanov <dmn@debian.org>"
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
.PD 0
.IP "Copyright (C) 2008,2009,2010 Damyan Ivanov <dmn@debian.org>" 4
.IX Item "Copyright (C) 2008,2009,2010 Damyan Ivanov <dmn@debian.org>"
.PD
.PP
This program is free software; you can redistribute it and/or modify it under
the terms of the \s-1GNU\s0 General Public License version 2 as published by the Free
Software Foundation.
.PP
This program is distributed in the hope that it will be useful, but \s-1WITHOUT ANY
WARRANTY\s0; without even the implied warranty of \s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A
PARTICULAR PURPOSE.\s0  See the \s-1GNU\s0 General Public License for more details.
.PP
You should have received a copy of the \s-1GNU\s0 General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, \s-1MA 02110\-1301 USA.\s0