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1 | package Moose::Meta::Role::Application::ToClass; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
d939e016 |
7 | use Moose::Util 'english_list'; |
154a4aae |
8 | use Scalar::Util 'weaken', 'blessed'; |
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9 | |
85f8617c |
10 | our $VERSION = '0.78'; |
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11 | $VERSION = eval $VERSION; |
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12 | our $AUTHORITY = 'cpan:STEVAN'; |
13 | |
14 | use base 'Moose::Meta::Role::Application'; |
15 | |
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16 | __PACKAGE__->meta->add_attribute('role' => ( |
17 | reader => 'role', |
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18 | )); |
19 | |
20 | __PACKAGE__->meta->add_attribute('class' => ( |
21 | reader => 'class', |
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22 | )); |
23 | |
1c9db35c |
24 | sub apply { |
d03bd989 |
25 | my ($self, $role, $class) = @_; |
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26 | |
154a4aae |
27 | # We need weak_ref in CMOP :( |
28 | weaken($self->{role} = $role); |
29 | weaken($self->{class} = $class); |
ff9c4953 |
30 | |
1c9db35c |
31 | $self->SUPER::apply($role, $class); |
a9b63d79 |
32 | |
d03bd989 |
33 | $class->add_role($role); |
a9b63d79 |
34 | $class->add_role_application($self); |
1c9db35c |
35 | } |
36 | |
37 | sub check_role_exclusions { |
38 | my ($self, $role, $class) = @_; |
39 | if ($class->excludes_role($role->name)) { |
4c0b3599 |
40 | $class->throw_error("Conflict detected: " . $class->name . " excludes role '" . $role->name . "'"); |
1c9db35c |
41 | } |
42 | foreach my $excluded_role_name ($role->get_excluded_roles_list) { |
43 | if ($class->does_role($excluded_role_name)) { |
4c0b3599 |
44 | $class->throw_error("The class " . $class->name . " does the excluded role '$excluded_role_name'"); |
1c9db35c |
45 | } |
46 | } |
47 | } |
48 | |
49 | sub check_required_methods { |
50 | my ($self, $role, $class) = @_; |
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51 | |
52 | my @missing; |
53 | my @is_attr; |
54 | |
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55 | # NOTE: |
56 | # we might need to move this down below the |
57 | # the attributes so that we can require any |
58 | # attribute accessors. However I am thinking |
59 | # that maybe those are somehow exempt from |
60 | # the require methods stuff. |
61 | foreach my $required_method_name ($role->get_required_method_list) { |
62 | |
3e19778d |
63 | if (!$class->find_method_by_name($required_method_name)) { |
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64 | |
3e19778d |
65 | next if $self->is_aliased_method($required_method_name); |
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66 | |
67 | push @missing, $required_method_name; |
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68 | } |
1c9db35c |
69 | } |
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70 | |
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71 | return unless @missing; |
d939e016 |
72 | |
73 | my $error = ''; |
74 | |
75 | if (@missing) { |
76 | my $noun = @missing == 1 ? 'method' : 'methods'; |
77 | |
78 | my $list |
79 | = Moose::Util::english_list( map { q{'} . $_ . q{'} } @missing ); |
80 | |
81 | $error |
82 | .= q{'} |
83 | . $role->name |
84 | . "' requires the $noun $list " |
85 | . "to be implemented by '" |
86 | . $class->name . q{'}; |
87 | } |
88 | |
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89 | $class->throw_error($error); |
1c9db35c |
90 | } |
91 | |
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92 | sub check_required_attributes { |
d03bd989 |
93 | |
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94 | } |
95 | |
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96 | sub apply_attributes { |
97 | my ($self, $role, $class) = @_; |
98 | foreach my $attribute_name ($role->get_attribute_list) { |
99 | # it if it has one already |
100 | if ($class->has_attribute($attribute_name) && |
101 | # make sure we haven't seen this one already too |
102 | $class->get_attribute($attribute_name) != $role->get_attribute($attribute_name)) { |
103 | next; |
104 | } |
105 | else { |
d7d8a8c7 |
106 | $class->add_attribute( |
107 | $attribute_name, |
108 | $role->get_attribute($attribute_name) |
109 | ); |
1c9db35c |
110 | } |
111 | } |
112 | } |
113 | |
114 | sub apply_methods { |
115 | my ($self, $role, $class) = @_; |
116 | foreach my $method_name ($role->get_method_list) { |
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117 | |
f5b6d42e |
118 | unless ($self->is_method_excluded($method_name)) { |
119 | # it if it has one already |
120 | if ($class->has_method($method_name) && |
121 | # and if they are not the same thing ... |
122 | $class->get_method($method_name)->body != $role->get_method($method_name)->body) { |
123 | next; |
124 | } |
125 | else { |
6549b0d1 |
126 | # add it, although it could be overridden |
f5b6d42e |
127 | $class->add_method( |
128 | $method_name, |
129 | $role->get_method($method_name) |
d03bd989 |
130 | ); |
f5b6d42e |
131 | } |
1c9db35c |
132 | } |
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133 | |
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134 | if ($self->is_method_aliased($method_name)) { |
135 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
136 | # it if it has one already |
137 | if ($class->has_method($aliased_method_name) && |
138 | # and if they are not the same thing ... |
139 | $class->get_method($aliased_method_name)->body != $role->get_method($method_name)->body) { |
4c0b3599 |
140 | $class->throw_error("Cannot create a method alias if a local method of the same name exists"); |
d03bd989 |
141 | } |
87e63626 |
142 | $class->add_method( |
43a41ede |
143 | $aliased_method_name, |
144 | $role->get_method($method_name) |
d03bd989 |
145 | ); |
146 | } |
1c9db35c |
147 | } |
148 | # we must reset the cache here since |
149 | # we are just aliasing methods, otherwise |
150 | # the modifiers go wonky. |
d03bd989 |
151 | $class->reset_package_cache_flag; |
1c9db35c |
152 | } |
153 | |
154 | sub apply_override_method_modifiers { |
155 | my ($self, $role, $class) = @_; |
156 | foreach my $method_name ($role->get_method_modifier_list('override')) { |
157 | # it if it has one already then ... |
158 | if ($class->has_method($method_name)) { |
159 | next; |
160 | } |
161 | else { |
162 | # if this is not a role, then we need to |
163 | # find the original package of the method |
164 | # so that we can tell the class were to |
165 | # find the right super() method |
166 | my $method = $role->get_override_method_modifier($method_name); |
167 | my ($package) = Class::MOP::get_code_info($method); |
168 | # if it is a class, we just add it |
169 | $class->add_override_method_modifier($method_name, $method, $package); |
170 | } |
171 | } |
172 | } |
173 | |
174 | sub apply_method_modifiers { |
175 | my ($self, $modifier_type, $role, $class) = @_; |
176 | my $add = "add_${modifier_type}_method_modifier"; |
177 | my $get = "get_${modifier_type}_method_modifiers"; |
178 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
179 | $class->$add( |
180 | $method_name, |
181 | $_ |
182 | ) foreach $role->$get($method_name); |
183 | } |
184 | } |
185 | |
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186 | 1; |
187 | |
188 | __END__ |
189 | |
190 | =pod |
191 | |
192 | =head1 NAME |
193 | |
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194 | Moose::Meta::Role::Application::ToClass - Compose a role into a class |
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195 | |
196 | =head1 DESCRIPTION |
197 | |
198 | =head2 METHODS |
199 | |
200 | =over 4 |
201 | |
202 | =item B<new> |
203 | |
204 | =item B<meta> |
205 | |
1c9db35c |
206 | =item B<apply> |
207 | |
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208 | =item B<check_role_exclusions> |
209 | |
1c9db35c |
210 | =item B<check_required_methods> |
211 | |
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212 | =item B<check_required_attributes> |
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213 | |
214 | =item B<apply_attributes> |
215 | |
216 | =item B<apply_methods> |
217 | |
218 | =item B<apply_method_modifiers> |
219 | |
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220 | =item B<apply_override_method_modifiers> |
221 | |
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222 | =back |
223 | |
224 | =head1 BUGS |
225 | |
226 | All complex software has bugs lurking in it, and this module is no |
227 | exception. If you find a bug please either email me, or add the bug |
228 | to cpan-RT. |
229 | |
230 | =head1 AUTHOR |
231 | |
232 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
233 | |
234 | =head1 COPYRIGHT AND LICENSE |
235 | |
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236 | Copyright 2006-2009 by Infinity Interactive, Inc. |
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237 | |
238 | L<http://www.iinteractive.com> |
239 | |
240 | This library is free software; you can redistribute it and/or modify |
241 | it under the same terms as Perl itself. |
242 | |
243 | =cut |
244 | |