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