Commit | Line | Data |
38bf2a25 |
1 | |
2 | package metaclass; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed'; |
9 | use Try::Tiny; |
10 | |
38bf2a25 |
11 | use Class::MOP; |
12 | |
13 | sub import { |
14 | my ( $class, @args ) = @_; |
15 | |
16 | unshift @args, "metaclass" if @args % 2 == 1; |
17 | my %options = @args; |
18 | |
19 | my $meta_name = exists $options{meta_name} ? $options{meta_name} : 'meta'; |
20 | my $metaclass = delete $options{metaclass}; |
21 | |
22 | unless ( defined $metaclass ) { |
23 | $metaclass = "Class::MOP::Class"; |
24 | } else { |
25 | Class::MOP::load_class($metaclass); |
26 | } |
27 | |
28 | ($metaclass->isa('Class::MOP::Class')) |
29 | || confess "The metaclass ($metaclass) must be derived from Class::MOP::Class"; |
30 | |
31 | # make sure the custom metaclasses get loaded |
32 | foreach my $key (grep { /_(?:meta)?class$/ } keys %options) { |
33 | unless ( ref( my $class = $options{$key} ) ) { |
34 | Class::MOP::load_class($class) |
35 | } |
36 | } |
37 | |
38 | my $package = caller(); |
39 | |
40 | # create a meta object so we can install &meta |
41 | my $meta = $metaclass->initialize($package => %options); |
42 | $meta->_add_meta_method($meta_name) |
43 | if defined $meta_name; |
44 | } |
45 | |
46 | 1; |
47 | |
48 | # ABSTRACT: a pragma for installing and using Class::MOP metaclasses |
49 | |
50 | __END__ |
51 | |
52 | =pod |
53 | |
54 | =head1 SYNOPSIS |
55 | |
56 | package MyClass; |
57 | |
58 | # use Class::MOP::Class |
59 | use metaclass; |
60 | |
61 | # ... or use a custom metaclass |
62 | use metaclass 'MyMetaClass'; |
63 | |
64 | # ... or use a custom metaclass |
65 | # and custom attribute and method |
66 | # metaclasses |
67 | use metaclass 'MyMetaClass' => ( |
68 | 'attribute_metaclass' => 'MyAttributeMetaClass', |
69 | 'method_metaclass' => 'MyMethodMetaClass', |
70 | ); |
71 | |
72 | # ... or just specify custom attribute |
73 | # and method classes, and Class::MOP::Class |
74 | # is the assumed metaclass |
75 | use metaclass ( |
76 | 'attribute_metaclass' => 'MyAttributeMetaClass', |
77 | 'method_metaclass' => 'MyMethodMetaClass', |
78 | ); |
79 | |
80 | # if we'd rather not install a 'meta' method, we can do this |
81 | use metaclass meta_name => undef; |
82 | # or if we'd like it to have a different name, |
83 | use metaclass meta_name => 'my_meta'; |
84 | |
85 | =head1 DESCRIPTION |
86 | |
87 | This is a pragma to make it easier to use a specific metaclass |
88 | and a set of custom attribute and method metaclasses. It also |
89 | installs a C<meta> method to your class as well, unless C<undef> |
90 | is passed to the C<meta_name> option. |
91 | |
b5d324aa |
92 | Note that if you are using Moose, you most likely do B<not> want |
93 | to be using this - look into L<Moose::Util::MetaRole> instead. |
94 | |
38bf2a25 |
95 | =cut |