Commit | Line | Data |
d245e471 |
1 | package Moo::Role; |
2 | |
3 | use strictures 1; |
4 | use Moo::_Utils; |
5 | use base qw(Role::Tiny); |
6 | |
7 | BEGIN { *INFO = \%Role::Tiny::INFO } |
8 | |
9 | our %INFO; |
10 | |
11 | sub import { |
12 | my $target = caller; |
13 | strictures->import; |
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14 | return if $INFO{$target}; # already exported into this package |
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15 | # get symbol table reference |
16 | my $stash = do { no strict 'refs'; \%{"${target}::"} }; |
17 | *{_getglob "${target}::has"} = sub { |
18 | my ($name, %spec) = @_; |
19 | ($INFO{$target}{accessor_maker} ||= do { |
20 | require Method::Generate::Accessor; |
21 | Method::Generate::Accessor->new |
22 | })->generate_method($target, $name, \%spec); |
23 | $INFO{$target}{attributes}{$name} = \%spec; |
24 | }; |
25 | goto &Role::Tiny::import; |
26 | } |
27 | |
28 | sub apply_role_to_package { |
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29 | my ($me, $to, $role) = @_; |
30 | $me->SUPER::apply_role_to_package($to, $role); |
d245e471 |
31 | $me->_handle_constructor($to, $INFO{$role}{attributes}); |
32 | } |
33 | |
34 | sub create_class_with_roles { |
35 | my ($me, $superclass, @roles) = @_; |
36 | |
37 | my $new_name = join('+', $superclass, my $compose_name = join '+', @roles); |
38 | return $new_name if $Role::Tiny::COMPOSED{class}{$new_name}; |
39 | |
40 | require Sub::Quote; |
41 | |
42 | $me->SUPER::create_class_with_roles($superclass, @roles); |
43 | |
44 | foreach my $role (@roles) { |
45 | die "${role} is not a Role::Tiny" unless my $info = $INFO{$role}; |
46 | } |
47 | |
48 | $me->_handle_constructor( |
49 | $new_name, { map %{$INFO{$_}{attributes}||{}}, @roles } |
50 | ); |
51 | |
52 | return $new_name; |
53 | } |
54 | |
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55 | sub _install_single_modifier { |
56 | my ($me, @args) = @_; |
57 | _install_modifier(@args); |
d245e471 |
58 | } |
59 | |
60 | sub _handle_constructor { |
61 | my ($me, $to, $attr_info) = @_; |
62 | return unless $attr_info && keys %$attr_info; |
63 | if ($INFO{$to}) { |
64 | @{$INFO{$to}{attributes}||={}}{keys %$attr_info} = values %$attr_info; |
65 | } else { |
66 | # only fiddle with the constructor if the target is a Moo class |
67 | if ($INC{"Moo.pm"} |
68 | and my $con = Moo->_constructor_maker_for($to)) { |
69 | $con->register_attribute_specs(%$attr_info); |
70 | } |
71 | } |
72 | } |
73 | |
74 | 1; |
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75 | |
0b6e5fff |
76 | =head1 NAME |
77 | |
78 | Moo::Role - Minimal Object Orientation support for Roles |
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79 | |
80 | =head1 SYNOPSIS |
81 | |
82 | package My::Role; |
83 | |
84 | use Moo::Role; |
85 | |
86 | sub foo { ... } |
87 | |
88 | sub bar { ... } |
89 | |
90 | has baz => ( |
91 | is => 'ro', |
92 | ); |
93 | |
94 | 1; |
95 | |
96 | else where |
97 | |
98 | package Some::Class; |
99 | |
100 | use Moo; |
101 | |
102 | # bar gets imported, but not foo |
103 | with('My::Role'); |
104 | |
105 | sub foo { ... } |
106 | |
107 | 1; |
108 | |
109 | =head1 DESCRIPTION |
110 | |
111 | C<Moo::Role> builds upon L<Role::Tiny>, so look there for most of the |
112 | documentation on how this works. The main addition here is extra bits to make |
113 | the roles more "Moosey;" which is to say, it adds L</has>. |
114 | |
115 | =head1 IMPORTED SUBROUTINES |
116 | |
117 | See L<Role::Tiny/IMPORTED SUBROUTINES> for all the other subroutines that are |
118 | imported by this module. |
119 | |
120 | =head2 has |
121 | |
122 | has attr => ( |
123 | is => 'ro', |
124 | ); |
125 | |
126 | Declares an attribute for the class to be composed into. See |
127 | L<Moo/has> for all options. |