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1 | package Moose::Meta::Role::Application::ToClass; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
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7 | use Moose::Util 'english_list'; |
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8 | use Scalar::Util 'weaken', 'blessed'; |
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9 | |
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10 | use base 'Moose::Meta::Role::Application'; |
11 | |
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12 | __PACKAGE__->meta->add_attribute('role' => ( |
13 | reader => 'role', |
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14 | )); |
15 | |
16 | __PACKAGE__->meta->add_attribute('class' => ( |
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17 | accessor => 'class', |
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18 | )); |
19 | |
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20 | sub apply { |
d03bd989 |
21 | my ($self, $role, $class) = @_; |
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22 | |
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23 | # We need weak_ref in CMOP :( |
24 | weaken($self->{role} = $role); |
25 | weaken($self->{class} = $class); |
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26 | |
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27 | $self->SUPER::apply($role, $class); |
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28 | |
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29 | $class->add_role($role); |
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30 | $class->add_role_application($self); |
1c9db35c |
31 | } |
32 | |
33 | sub check_role_exclusions { |
34 | my ($self, $role, $class) = @_; |
35 | if ($class->excludes_role($role->name)) { |
4c0b3599 |
36 | $class->throw_error("Conflict detected: " . $class->name . " excludes role '" . $role->name . "'"); |
1c9db35c |
37 | } |
38 | foreach my $excluded_role_name ($role->get_excluded_roles_list) { |
39 | if ($class->does_role($excluded_role_name)) { |
4c0b3599 |
40 | $class->throw_error("The class " . $class->name . " does the excluded role '$excluded_role_name'"); |
1c9db35c |
41 | } |
42 | } |
43 | } |
44 | |
45 | sub check_required_methods { |
46 | my ($self, $role, $class) = @_; |
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47 | |
48 | my @missing; |
49 | my @is_attr; |
50 | |
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51 | # NOTE: |
52 | # we might need to move this down below the |
53 | # the attributes so that we can require any |
54 | # attribute accessors. However I am thinking |
55 | # that maybe those are somehow exempt from |
56 | # the require methods stuff. |
92b7f727 |
57 | foreach my $required_method ($role->get_required_method_list) { |
58 | my $required_method_name = $required_method->name; |
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59 | |
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60 | if (!$class->find_method_by_name($required_method_name)) { |
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61 | |
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62 | next if $self->is_aliased_method($required_method_name); |
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63 | |
92b7f727 |
64 | push @missing, $required_method; |
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65 | } |
1c9db35c |
66 | } |
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67 | |
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68 | return unless @missing; |
d939e016 |
69 | |
70 | my $error = ''; |
71 | |
bb365545 |
72 | @missing = sort { $a->name cmp $b->name } @missing; |
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73 | my @conflicts = grep { $_->isa('Moose::Meta::Role::Method::Conflicting') } @missing; |
884837f3 |
74 | |
75 | if (@conflicts) { |
76 | my $conflict = $conflicts[0]; |
e893345e |
77 | my $roles = $conflict->roles_as_english_list; |
78 | |
79 | my @same_role_conflicts = grep { $_->roles_as_english_list eq $roles } @conflicts; |
80 | |
81 | if (@same_role_conflicts == 1) { |
82 | $error |
83 | .= "Due to a method name conflict in roles " |
84 | . $roles |
85 | . ", the method '" |
86 | . $conflict->name |
87 | . "' must be implemented or excluded by '" |
88 | . $class->name |
89 | . q{'}; |
90 | } |
91 | else { |
92 | my $methods |
93 | = Moose::Util::english_list( map { q{'} . $_->name . q{'} } @same_role_conflicts ); |
94 | |
95 | $error |
96 | .= "Due to method name conflicts in roles " |
97 | . $roles |
98 | . ", the methods " |
99 | . $methods |
100 | . " must be implemented or excluded by '" |
101 | . $class->name |
102 | . q{'}; |
103 | } |
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104 | } |
105 | elsif (@missing) { |
d939e016 |
106 | my $noun = @missing == 1 ? 'method' : 'methods'; |
107 | |
108 | my $list |
109 | = Moose::Util::english_list( map { q{'} . $_ . q{'} } @missing ); |
110 | |
111 | $error |
112 | .= q{'} |
113 | . $role->name |
114 | . "' requires the $noun $list " |
115 | . "to be implemented by '" |
116 | . $class->name . q{'}; |
117 | } |
118 | |
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119 | $class->throw_error($error); |
1c9db35c |
120 | } |
121 | |
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122 | sub check_required_attributes { |
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123 | |
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124 | } |
125 | |
1c9db35c |
126 | sub apply_attributes { |
127 | my ($self, $role, $class) = @_; |
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128 | |
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129 | foreach my $attribute_name ($role->get_attribute_list) { |
130 | # it if it has one already |
131 | if ($class->has_attribute($attribute_name) && |
132 | # make sure we haven't seen this one already too |
133 | $class->get_attribute($attribute_name) != $role->get_attribute($attribute_name)) { |
134 | next; |
135 | } |
136 | else { |
d7d8a8c7 |
137 | $class->add_attribute( |
3cfeb291 |
138 | $role->get_attribute($attribute_name)->attribute_for_class |
d7d8a8c7 |
139 | ); |
1c9db35c |
140 | } |
141 | } |
142 | } |
143 | |
144 | sub apply_methods { |
4a9e8ff6 |
145 | my ( $self, $role, $class ) = @_; |
146 | |
147 | foreach my $method ( $role->_get_local_methods ) { |
148 | my $method_name = $method->name; |
149 | |
ba7d613d |
150 | next if $method->isa('Class::MOP::Method::Meta'); |
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151 | |
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152 | unless ( $self->is_method_excluded($method_name) ) { |
153 | |
154 | my $class_method = $class->get_method($method_name); |
155 | |
156 | next if $class_method && $class_method->body != $method->body; |
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157 | |
87e63626 |
158 | $class->add_method( |
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159 | $method_name, |
160 | $method, |
161 | ); |
162 | } |
163 | |
164 | next unless $self->is_method_aliased($method_name); |
165 | |
166 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
167 | |
168 | my $class_method = $class->get_method($aliased_method_name); |
169 | |
170 | if ( $class_method && $class_method->body != $method->body ) { |
171 | $class->throw_error( |
172 | "Cannot create a method alias if a local method of the same name exists" |
d03bd989 |
173 | ); |
174 | } |
4a9e8ff6 |
175 | |
176 | $class->add_method( |
177 | $aliased_method_name, |
178 | $method, |
179 | ); |
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180 | } |
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181 | |
1c9db35c |
182 | # we must reset the cache here since |
183 | # we are just aliasing methods, otherwise |
184 | # the modifiers go wonky. |
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185 | $class->reset_package_cache_flag; |
1c9db35c |
186 | } |
187 | |
188 | sub apply_override_method_modifiers { |
189 | my ($self, $role, $class) = @_; |
190 | foreach my $method_name ($role->get_method_modifier_list('override')) { |
191 | # it if it has one already then ... |
192 | if ($class->has_method($method_name)) { |
193 | next; |
194 | } |
195 | else { |
196 | # if this is not a role, then we need to |
197 | # find the original package of the method |
198 | # so that we can tell the class were to |
199 | # find the right super() method |
200 | my $method = $role->get_override_method_modifier($method_name); |
201 | my ($package) = Class::MOP::get_code_info($method); |
202 | # if it is a class, we just add it |
203 | $class->add_override_method_modifier($method_name, $method, $package); |
204 | } |
205 | } |
206 | } |
207 | |
208 | sub apply_method_modifiers { |
209 | my ($self, $modifier_type, $role, $class) = @_; |
210 | my $add = "add_${modifier_type}_method_modifier"; |
211 | my $get = "get_${modifier_type}_method_modifiers"; |
212 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
213 | $class->$add( |
214 | $method_name, |
215 | $_ |
216 | ) foreach $role->$get($method_name); |
217 | } |
218 | } |
219 | |
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220 | 1; |
221 | |
ad46f524 |
222 | # ABSTRACT: Compose a role into a class |
223 | |
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224 | __END__ |
225 | |
226 | =pod |
227 | |
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228 | =head1 DESCRIPTION |
229 | |
230 | =head2 METHODS |
231 | |
232 | =over 4 |
233 | |
234 | =item B<new> |
235 | |
236 | =item B<meta> |
237 | |
1c9db35c |
238 | =item B<apply> |
239 | |
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240 | =item B<check_role_exclusions> |
241 | |
1c9db35c |
242 | =item B<check_required_methods> |
243 | |
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244 | =item B<check_required_attributes> |
1c9db35c |
245 | |
246 | =item B<apply_attributes> |
247 | |
248 | =item B<apply_methods> |
249 | |
250 | =item B<apply_method_modifiers> |
251 | |
1c9db35c |
252 | =item B<apply_override_method_modifiers> |
253 | |
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254 | =back |
255 | |
256 | =head1 BUGS |
257 | |
d4048ef3 |
258 | See L<Moose/BUGS> for details on reporting bugs. |
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259 | |
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260 | =cut |
261 | |