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package Class::MOP::Method::Meta;
our $VERSION = '2.4000';
use strict;
use warnings;
use Carp 'confess';
use Scalar::Util 'blessed', 'weaken';
use constant DEBUG_NO_META => $ENV{DEBUG_NO_META} ? 1 : 0;
use parent 'Class::MOP::Method';
sub _is_caller_mop_internal {
my $self = shift;
my ($caller) = @_;
return $caller =~ /^(?:Class::MOP|metaclass)(?:::|$)/;
}
sub _generate_meta_method {
my $method_self = shift;
my $metaclass = shift;
weaken($metaclass);
sub {
# this will be compiled out if the env var wasn't set
if (DEBUG_NO_META) {
confess "'meta' method called by MOP internals"
# it's okay to call meta methods on metaclasses, since we
# explicitly ask for them
if !$_[0]->isa('Class::MOP::Object')
&& !$_[0]->isa('Class::MOP::Mixin')
# it's okay if the test itself calls ->meta, we only care about
# if the mop internals call ->meta
&& $method_self->_is_caller_mop_internal(scalar caller);
}
# 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]) || $_[0])
};
}
sub wrap {
my ($class, @args) = @_;
unshift @args, 'body' if @args % 2 == 1;
my %params = @args;
$class->_throw_exception( CannotOverrideBodyOfMetaMethods => params => \%params,
class => $class
)
if $params{body};
my $metaclass_class = $params{associated_metaclass}->meta;
$params{body} = $class->_generate_meta_method($metaclass_class);
return $class->SUPER::wrap(%params);
}
sub _make_compatible_with {
my $self = shift;
my ($other) = @_;
# XXX: this is pretty gross. the issue here is that CMOP::Method::Meta
# objects are subclasses of CMOP::Method, but when we get to moose, they'll
# need to be compatible with Moose::Meta::Method, which isn't possible. the
# right solution here is to make ::Meta into a role that gets applied to
# whatever the method_metaclass happens to be and get rid of
# _meta_method_metaclass entirely, but that's not going to happen until
# we ditch cmop and get roles into the bootstrapping, so. i'm not
# maintaining the previous behavior of turning them into instances of the
# new method_metaclass because that's equally broken, and at least this way
# any issues will at least be detectable and potentially fixable. -doy
return $self unless $other->_is_compatible_with($self->_real_ref_name);
return $self->SUPER::_make_compatible_with(@_);
}
1;
# ABSTRACT: Method Meta Object for C<meta> methods
__END__
=pod
=encoding UTF-8
=head1 NAME
Class::MOP::Method::Meta - Method Meta Object for C<meta> methods
=head1 VERSION
version 2.4000
=head1 DESCRIPTION
This is a L<Class::MOP::Method> subclass which represents C<meta>
methods installed into classes by Class::MOP.
=head1 METHODS
=over 4
=item B<< Class::MOP::Method::Wrapped->wrap($metamethod, %options) >>
This is the constructor. It accepts a L<Class::MOP::Method> object and
a hash of options. The options accepted are identical to the ones
accepted by L<Class::MOP::Method>, except that C<body> cannot be passed
(it will be generated automatically).
=back
=head1 AUTHORS
=over 4
=item *
Stevan Little <stevan@cpan.org>
=item *
Dave Rolsky <autarch@urth.org>
=item *
Jesse Luehrs <doy@cpan.org>
=item *
Shawn M Moore <sartak@cpan.org>
=item *
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
=item *
Karen Etheridge <ether@cpan.org>
=item *
Florian Ragwitz <rafl@debian.org>
=item *
Hans Dieter Pearcey <hdp@cpan.org>
=item *
Chris Prather <chris@prather.org>
=item *
Matt S Trout <mstrout@cpan.org>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by Infinity Interactive, Inc.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|
