Commit | Line | Data |
59b51046 |
1 | |
2 | package Class::MOP::Method::Meta; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed'; |
9 | |
a9f48b4b |
10 | our $VERSION = '1.11'; |
59b51046 |
11 | $VERSION = eval $VERSION; |
12 | our $AUTHORITY = 'cpan:STEVAN'; |
13 | |
684b69cf |
14 | use constant DEBUG_NO_META => $ENV{DEBUG_NO_META} ? 1 : 0; |
59b51046 |
15 | |
16 | use base 'Class::MOP::Method'; |
17 | |
28a82dda |
18 | sub _is_caller_mop_internal { |
19 | my $self = shift; |
20 | my ($caller) = @_; |
21 | return $caller =~ /^(?:Class::MOP|metaclass)(?:::|$)/; |
22 | } |
23 | |
59b51046 |
24 | sub _generate_meta_method { |
25 | my $method_self = shift; |
26 | my $metaclass = shift; |
27 | sub { |
28 | # this will be compiled out if the env var wasn't set |
29 | if (DEBUG_NO_META) { |
59b51046 |
30 | confess "'meta' method called by MOP internals" |
28a82dda |
31 | # it's okay to call meta methods on metaclasses, since we |
32 | # explicitly ask for them |
33 | if !$_[0]->isa('Class::MOP::Object') |
23ab51e4 |
34 | && !$_[0]->isa('Class::MOP::Mixin') |
28a82dda |
35 | # it's okay if the test itself calls ->meta, we only care about |
36 | # if the mop internals call ->meta |
37 | && $method_self->_is_caller_mop_internal(scalar caller); |
59b51046 |
38 | } |
39 | # we must re-initialize so that it |
40 | # works as expected in subclasses, |
41 | # since metaclass instances are |
42 | # singletons, this is not really a |
43 | # big deal anyway. |
44 | $metaclass->initialize(blessed($_[0]) || $_[0]) |
45 | }; |
46 | } |
47 | |
48 | sub wrap { |
49 | my ($class, @args) = @_; |
50 | |
51 | unshift @args, 'body' if @args % 2 == 1; |
52 | my %params = @args; |
53 | confess "Overriding the body of meta methods is not allowed" |
54 | if $params{body}; |
55 | |
56 | my $metaclass_class = $params{associated_metaclass}->meta; |
57 | $params{body} = $class->_generate_meta_method($metaclass_class); |
58 | return $class->SUPER::wrap(%params); |
59 | } |
60 | |
5281e1f9 |
61 | sub _make_compatible_with { |
62 | my $self = shift; |
63 | my ($other) = @_; |
64 | |
65 | # XXX: this is pretty gross. the issue here is that CMOP::Method::Meta |
66 | # objects are subclasses of CMOP::Method, but when we get to moose, they'll |
67 | # need to be compatible with Moose::Meta::Method, which isn't possible. the |
68 | # right solution here is to make ::Meta into a role that gets applied to |
69 | # whatever the method_metaclass happens to be and get rid of |
70 | # _meta_method_metaclass entirely, but that's not going to happen until |
71 | # we ditch cmop and get roles into the bootstrapping, so. i'm not |
72 | # maintaining the previous behavior of turning them into instances of the |
73 | # new method_metaclass because that's equally broken, and at least this way |
74 | # any issues will at least be detectable and potentially fixable. -doy |
75 | return $self unless $other->_is_compatible_with($self->_real_ref_name); |
76 | |
77 | return $self->SUPER::_make_compatible_with(@_); |
78 | } |
79 | |
59b51046 |
80 | 1; |
81 | |
82 | __END__ |
83 | |
84 | =pod |
85 | |
86 | =head1 NAME |
87 | |
88 | Class::MOP::Method::Meta - Method Meta Object for C<meta> methods |
89 | |
90 | =head1 DESCRIPTION |
91 | |
92 | This is a L<Class::MOP::Method> subclass which represents C<meta> |
93 | methods installed into classes by Class::MOP. |
94 | |
95 | =head1 METHODS |
96 | |
97 | =over 4 |
98 | |
99 | =item B<< Class::MOP::Method::Wrapped->wrap($metamethod, %options) >> |
100 | |
101 | This is the constructor. It accepts a L<Class::MOP::Method> object and |
102 | a hash of options. The options accepted are identical to the ones |
103 | accepted by L<Class::MOP::Method>, except that C<body> cannot be passed |
104 | (it will be generated automatically). |
105 | |
106 | =back |
107 | |
108 | =head1 AUTHORS |
109 | |
110 | Jesse Luehrs E<lt>doy at tozt dot netE<gt> |
111 | |
112 | =head1 COPYRIGHT AND LICENSE |
113 | |
114 | Copyright 2006-2010 by Infinity Interactive, Inc. |
115 | |
116 | L<http://www.iinteractive.com> |
117 | |
118 | This library is free software; you can redistribute it and/or modify |
119 | it under the same terms as Perl itself. |
120 | |
121 | =cut |
122 | |