—package
metaclass;
use
strict;
use
warnings;
our
$VERSION
=
'0.92'
;
$VERSION
=
eval
$VERSION
;
our
$AUTHORITY
=
'cpan:STEVAN'
;
use
Class::MOP;
sub
import
{
my
(
$class
,
@args
) =
@_
;
unshift
@args
,
"metaclass"
if
@args
% 2 == 1;
my
%options
=
@args
;
my
$metaclass
=
delete
$options
{metaclass};
unless
(
defined
$metaclass
) {
$metaclass
=
"Class::MOP::Class"
;
}
else
{
Class::MOP::load_class(
$metaclass
);
}
(
$metaclass
->isa(
'Class::MOP::Class'
))
|| confess
"The metaclass ($metaclass) must be derived from Class::MOP::Class"
;
# make sure the custom metaclasses get loaded
foreach
my
$key
(
grep
{ /_(?:meta)?class$/ }
keys
%options
) {
unless
(
ref
(
my
$class
=
$options
{
$key
} ) ) {
Class::MOP::load_class(
$class
)
}
}
my
$package
=
caller
();
# create a meta object so we can install &meta
my
$meta
=
$metaclass
->initialize(
$package
=>
%options
);
$meta
->add_method(
'meta'
=>
sub
{
# we must re-initialize so that it
# works as expected in subclasses,
# since metaclass instances are
# singletons, this is not really a
# big deal anyway.
$metaclass
->initialize((blessed(
$_
[0]) ||
$_
[0]) =>
%options
)
});
}
1;
__END__
=pod
=head1 NAME
metaclass - a pragma for installing and using Class::MOP metaclasses
=head1 SYNOPSIS
package MyClass;
# use Class::MOP::Class
use metaclass;
# ... or use a custom metaclass
use metaclass 'MyMetaClass';
# ... or use a custom metaclass
# and custom attribute and method
# metaclasses
use metaclass 'MyMetaClass' => (
'attribute_metaclass' => 'MyAttributeMetaClass',
'method_metaclass' => 'MyMethodMetaClass',
);
# ... or just specify custom attribute
# and method classes, and Class::MOP::Class
# is the assumed metaclass
use metaclass (
'attribute_metaclass' => 'MyAttributeMetaClass',
'method_metaclass' => 'MyMethodMetaClass',
);
=head1 DESCRIPTION
This is a pragma to make it easier to use a specific metaclass
and a set of custom attribute and method metaclasses. It also
installs a C<meta> method to your class as well.
=head1 AUTHORS
Stevan Little E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2009 by Infinity Interactive, Inc.
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut