Perl::Critic::Policy::UserlPerl::Critic::Policy::Modules::RequireVersionVar(3)NAMEPerl::Critic::Policy::Modules::RequireVersionVar - Give every module a
"$VERSION" number.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Every Perl file (modules, libraries, and programs) should have a
package-scoped $VERSION variable. The $VERSION allows clients to
insist on a particular revision of your file like this:
use SomeModule 2.4; #Only loads version 2.4
This Policy scans your file for any package variable named $VERSION.
I'm assuming that you are using "strict", so you'll have to declare it
like one of these:
our $VERSION = 1.0611;
$MyPackage::VERSION = 1.061;
use vars qw($VERSION);
use version; our $VERSION = qv(1.0611);
Perl's version system does not recognize lexical variables such as
my $VERSION = 1.0611;
so they are not accepted by this policy.
A common practice is to use the "$Revision: 4078 $" keyword to
automatically define the $VERSION variable like this:
our ($VERSION) = '$Revision: 4078 $' =~ m{ \$Revision: \s+ (\S+) }x;
CONFIGURATION
This Policy is not configurable except for the standard options.
NOTES
Conway recommends using the "version" pragma instead of raw numbers or
'v-strings.' However, this Policy only insists that the $VERSION be
defined somehow. I may try to extend this in the future.
TO DO
Add check that $VERSION is independently evaluatable. In particular,
prohibit this:
our $VERSION = $Other::Module::VERSION;
This doesn't work because PAUSE and other tools literally copy your
version declaration out of your module and evaluates it in isolation,
at which point there's nothing in "Other::Module", and so the $VERSION
is undefined.
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights
reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself. The full text of this license can
be found in the LICENSE file included with this module.
perl v5.14.1Perl::Critic::Policy::Modules::RequireVersionVar(3)
