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package metaclass;
use strict;
use warnings;
use Carp 'confess';
use Scalar::Util 'blessed';
our $VERSION = '1.03';
$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 2006-2010 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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