Commit | Line | Data |
e185c027 |
1 | |
2 | package Moose::Meta::Role; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
21f1e231 |
8 | use Scalar::Util 'blessed'; |
b6a00b82 |
9 | use Carp 'confess'; |
963c24e1 |
10 | use Devel::GlobalDestruction 'in_global_destruction'; |
bdabd620 |
11 | |
8ee73eeb |
12 | use Moose::Meta::Class; |
f785aad8 |
13 | use Moose::Meta::Role::Attribute; |
39b3bc94 |
14 | use Moose::Meta::Role::Method; |
d67145ed |
15 | use Moose::Meta::Role::Method::Required; |
bb153262 |
16 | use Moose::Meta::Role::Method::Conflicting; |
699a2e32 |
17 | use Moose::Meta::Method::Meta; |
f785aad8 |
18 | use Moose::Util qw( ensure_all_roles ); |
d2782813 |
19 | use Class::MOP::MiniTrait; |
8ee73eeb |
20 | |
72276e04 |
21 | use base 'Class::MOP::Module', |
22 | 'Class::MOP::Mixin::HasAttributes', |
23 | 'Class::MOP::Mixin::HasMethods'; |
80572233 |
24 | |
d2782813 |
25 | Class::MOP::MiniTrait::apply(__PACKAGE__, 'Moose::Meta::Object::Trait'); |
26 | |
fb1e11d5 |
27 | ## ------------------------------------------------------------------ |
28 | ## NOTE: |
29 | ## I normally don't do this, but I am doing |
30 | ## a whole bunch of meta-programmin in this |
31 | ## module, so it just makes sense. For a clearer |
d03bd989 |
32 | ## picture of what is going on in the next |
33 | ## several lines of code, look at the really |
fb1e11d5 |
34 | ## big comment at the end of this file (right |
35 | ## before the POD). |
36 | ## - SL |
37 | ## ------------------------------------------------------------------ |
80572233 |
38 | |
21716c07 |
39 | my $META = __PACKAGE__->meta; |
40 | |
41 | ## ------------------------------------------------------------------ |
42 | ## attributes ... |
e185c027 |
43 | |
21716c07 |
44 | # NOTE: |
45 | # since roles are lazy, we hold all the attributes |
fb1e11d5 |
46 | # of the individual role in 'statis' until which |
47 | # time when it is applied to a class. This means |
48 | # keeping a lot of things in hash maps, so we are |
21716c07 |
49 | # using a little of that meta-programmin' magic |
d03bd989 |
50 | # here an saving lots of extra typin. And since |
fb1e11d5 |
51 | # many of these attributes above require similar |
52 | # functionality to support them, so we again use |
53 | # the wonders of meta-programmin' to deliver a |
21716c07 |
54 | # very compact solution to this normally verbose |
55 | # problem. |
56 | # - SL |
57 | |
58 | foreach my $action ( |
fb1e11d5 |
59 | { |
60 | name => 'excluded_roles_map', |
61 | attr_reader => 'get_excluded_roles_map' , |
21716c07 |
62 | methods => { |
fb1e11d5 |
63 | add => 'add_excluded_roles', |
55f28f0a |
64 | get_keys => 'get_excluded_roles_list', |
fb1e11d5 |
65 | existence => 'excludes_role', |
21716c07 |
66 | } |
67 | }, |
fb1e11d5 |
68 | { |
69 | name => 'required_methods', |
21716c07 |
70 | attr_reader => 'get_required_methods_map', |
71 | methods => { |
7c62cb0a |
72 | remove => 'remove_required_methods', |
73 | get_values => 'get_required_method_list', |
74 | existence => 'requires_method', |
21716c07 |
75 | } |
d03bd989 |
76 | }, |
21716c07 |
77 | ) { |
fb1e11d5 |
78 | |
21716c07 |
79 | my $attr_reader = $action->{attr_reader}; |
80 | my $methods = $action->{methods}; |
fb1e11d5 |
81 | |
82 | # create the attribute |
83 | $META->add_attribute($action->{name} => ( |
84 | reader => $attr_reader, |
85 | default => sub { {} } |
86 | )); |
87 | |
88 | # create some helper methods |
21716c07 |
89 | $META->add_method($methods->{add} => sub { |
90 | my ($self, @values) = @_; |
fb1e11d5 |
91 | $self->$attr_reader->{$_} = undef foreach @values; |
21716c07 |
92 | }) if exists $methods->{add}; |
fb1e11d5 |
93 | |
55f28f0a |
94 | $META->add_method($methods->{get_keys} => sub { |
21716c07 |
95 | my ($self) = @_; |
fb1e11d5 |
96 | keys %{$self->$attr_reader}; |
55f28f0a |
97 | }) if exists $methods->{get_keys}; |
fb1e11d5 |
98 | |
8a0bfed9 |
99 | $META->add_method($methods->{get_values} => sub { |
100 | my ($self) = @_; |
101 | values %{$self->$attr_reader}; |
102 | }) if exists $methods->{get_values}; |
103 | |
21716c07 |
104 | $META->add_method($methods->{get} => sub { |
105 | my ($self, $name) = @_; |
fb1e11d5 |
106 | $self->$attr_reader->{$name} |
107 | }) if exists $methods->{get}; |
108 | |
21716c07 |
109 | $META->add_method($methods->{existence} => sub { |
110 | my ($self, $name) = @_; |
fb1e11d5 |
111 | exists $self->$attr_reader->{$name} ? 1 : 0; |
112 | }) if exists $methods->{existence}; |
113 | |
21716c07 |
114 | $META->add_method($methods->{remove} => sub { |
115 | my ($self, @values) = @_; |
116 | delete $self->$attr_reader->{$_} foreach @values; |
fb1e11d5 |
117 | }) if exists $methods->{remove}; |
21716c07 |
118 | } |
d79e62fd |
119 | |
b05518b2 |
120 | $META->add_attribute( |
121 | 'method_metaclass', |
122 | reader => 'method_metaclass', |
123 | default => 'Moose::Meta::Role::Method', |
124 | ); |
125 | |
77ed8b8d |
126 | $META->add_attribute( |
127 | 'required_method_metaclass', |
128 | reader => 'required_method_metaclass', |
129 | default => 'Moose::Meta::Role::Method::Required', |
130 | ); |
131 | |
eec8ca8a |
132 | $META->add_attribute( |
bb153262 |
133 | 'conflicting_method_metaclass', |
134 | reader => 'conflicting_method_metaclass', |
135 | default => 'Moose::Meta::Role::Method::Conflicting', |
eec8ca8a |
136 | ); |
137 | |
07de7559 |
138 | $META->add_attribute( |
139 | 'application_to_class_class', |
140 | reader => 'application_to_class_class', |
141 | default => 'Moose::Meta::Role::Application::ToClass', |
142 | ); |
143 | |
144 | $META->add_attribute( |
145 | 'application_to_role_class', |
146 | reader => 'application_to_role_class', |
147 | default => 'Moose::Meta::Role::Application::ToRole', |
148 | ); |
149 | |
150 | $META->add_attribute( |
151 | 'application_to_instance_class', |
152 | reader => 'application_to_instance_class', |
153 | default => 'Moose::Meta::Role::Application::ToInstance', |
154 | ); |
155 | |
d037bb62 |
156 | $META->add_attribute( |
157 | 'applied_attribute_metaclass', |
158 | reader => 'applied_attribute_metaclass', |
159 | default => 'Moose::Meta::Attribute', |
160 | ); |
161 | |
f785aad8 |
162 | # More or less copied from Moose::Meta::Class |
163 | sub initialize { |
164 | my $class = shift; |
165 | my $pkg = shift; |
6f73c555 |
166 | |
167 | if (defined(my $meta = Class::MOP::get_metaclass_by_name($pkg))) { |
168 | return $meta; |
169 | } |
170 | |
171 | my %options = @_; |
172 | |
173 | my $meta = $class->SUPER::initialize( |
f785aad8 |
174 | $pkg, |
175 | 'attribute_metaclass' => 'Moose::Meta::Role::Attribute', |
6f73c555 |
176 | %options, |
177 | ); |
178 | |
179 | Class::MOP::weaken_metaclass($pkg) if $options{weaken}; |
180 | |
181 | return $meta; |
f785aad8 |
182 | } |
80572233 |
183 | |
f785aad8 |
184 | sub reinitialize { |
21716c07 |
185 | my $self = shift; |
f785aad8 |
186 | my $pkg = shift; |
187 | |
188 | my $meta = blessed $pkg ? $pkg : Class::MOP::class_of($pkg); |
189 | |
190 | my %existing_classes; |
191 | if ($meta) { |
192 | %existing_classes = map { $_ => $meta->$_() } qw( |
193 | attribute_metaclass |
194 | method_metaclass |
195 | wrapped_method_metaclass |
196 | required_method_metaclass |
197 | conflicting_method_metaclass |
198 | application_to_class_class |
199 | application_to_role_class |
200 | application_to_instance_class |
d037bb62 |
201 | applied_attribute_metaclass |
f785aad8 |
202 | ); |
70ea9161 |
203 | } |
f785aad8 |
204 | |
6f73c555 |
205 | my %options = @_; |
206 | $options{weaken} = Class::MOP::metaclass_is_weak($meta->name) |
207 | if !exists $options{weaken} |
208 | && blessed($meta) |
209 | && $meta->isa('Moose::Meta::Role'); |
210 | |
6feff4da |
211 | # don't need to remove generated metaobjects here yet, since we don't |
212 | # yet generate anything in roles. this may change in the future though... |
213 | # keep an eye on that |
214 | my $new_meta = $self->SUPER::reinitialize( |
f785aad8 |
215 | $pkg, |
216 | %existing_classes, |
6f73c555 |
217 | %options, |
f785aad8 |
218 | ); |
6feff4da |
219 | $new_meta->_restore_metaobjects_from($meta) |
220 | if $meta && $meta->isa('Moose::Meta::Role'); |
221 | return $new_meta; |
222 | } |
223 | |
224 | sub _restore_metaobjects_from { |
225 | my $self = shift; |
226 | my ($old_meta) = @_; |
227 | |
228 | $self->_restore_metamethods_from($old_meta); |
229 | $self->_restore_metaattributes_from($old_meta); |
17c594b1 |
230 | |
231 | for my $role ( @{ $old_meta->get_roles } ) { |
232 | $self->add_role($role); |
233 | } |
f785aad8 |
234 | } |
235 | |
236 | sub add_attribute { |
237 | my $self = shift; |
238 | |
239 | if (blessed $_[0] && ! $_[0]->isa('Moose::Meta::Role::Attribute') ) { |
240 | my $class = ref $_[0]; |
241 | Moose->throw_error( "Cannot add a $class as an attribute to a role" ); |
21716c07 |
242 | } |
8c063f8e |
243 | elsif (!blessed($_[0]) && defined($_[0]) && $_[0] =~ /^\+(.*)/) { |
576cd474 |
244 | Moose->throw_error( "has '+attr' is not supported in roles" ); |
245 | } |
f785aad8 |
246 | |
247 | return $self->SUPER::add_attribute(@_); |
248 | } |
249 | |
250 | sub _attach_attribute { |
251 | my ( $self, $attribute ) = @_; |
252 | |
253 | $attribute->attach_to_role($self); |
21716c07 |
254 | } |
e185c027 |
255 | |
16d721b3 |
256 | sub add_required_methods { |
257 | my $self = shift; |
258 | |
259 | for (@_) { |
260 | my $method = $_; |
c9d7e396 |
261 | if (!blessed($method)) { |
16d721b3 |
262 | $method = $self->required_method_metaclass->new( |
263 | name => $method, |
264 | ); |
265 | } |
266 | $self->get_required_methods_map->{$method->name} = $method; |
267 | } |
268 | } |
269 | |
bb153262 |
270 | sub add_conflicting_method { |
09eeab06 |
271 | my $self = shift; |
272 | |
273 | my $method; |
274 | if (@_ == 1 && blessed($_[0])) { |
275 | $method = shift; |
276 | } |
277 | else { |
bb153262 |
278 | $method = $self->conflicting_method_metaclass->new(@_); |
09eeab06 |
279 | } |
280 | |
281 | $self->add_required_methods($method); |
282 | } |
283 | |
21716c07 |
284 | ## ------------------------------------------------------------------ |
285 | ## method modifiers |
286 | |
21716c07 |
287 | # NOTE: |
fb1e11d5 |
288 | # the before/around/after method modifiers are |
21716c07 |
289 | # stored by name, but there can be many methods |
290 | # then associated with that name. So again we have |
291 | # lots of similar functionality, so we can do some |
292 | # meta-programmin' and save some time. |
293 | # - SL |
294 | |
295 | foreach my $modifier_type (qw[ before around after ]) { |
fb1e11d5 |
296 | |
297 | my $attr_reader = "get_${modifier_type}_method_modifiers_map"; |
d03bd989 |
298 | |
fb1e11d5 |
299 | # create the attribute ... |
300 | $META->add_attribute("${modifier_type}_method_modifiers" => ( |
301 | reader => $attr_reader, |
302 | default => sub { {} } |
d03bd989 |
303 | )); |
fb1e11d5 |
304 | |
305 | # and some helper methods ... |
21716c07 |
306 | $META->add_method("get_${modifier_type}_method_modifiers" => sub { |
307 | my ($self, $method_name) = @_; |
fb1e11d5 |
308 | #return () unless exists $self->$attr_reader->{$method_name}; |
d9847263 |
309 | my $mm = $self->$attr_reader->{$method_name}; |
310 | $mm ? @$mm : (); |
21716c07 |
311 | }); |
fb1e11d5 |
312 | |
21716c07 |
313 | $META->add_method("has_${modifier_type}_method_modifiers" => sub { |
314 | my ($self, $method_name) = @_; |
315 | # NOTE: |
fb1e11d5 |
316 | # for now we assume that if it exists,.. |
21716c07 |
317 | # it has at least one modifier in it |
318 | (exists $self->$attr_reader->{$method_name}) ? 1 : 0; |
fb1e11d5 |
319 | }); |
320 | |
21716c07 |
321 | $META->add_method("add_${modifier_type}_method_modifier" => sub { |
322 | my ($self, $method_name, $method) = @_; |
fb1e11d5 |
323 | |
324 | $self->$attr_reader->{$method_name} = [] |
21716c07 |
325 | unless exists $self->$attr_reader->{$method_name}; |
fb1e11d5 |
326 | |
21716c07 |
327 | my $modifiers = $self->$attr_reader->{$method_name}; |
fb1e11d5 |
328 | |
21716c07 |
329 | # NOTE: |
fb1e11d5 |
330 | # check to see that we aren't adding the |
331 | # same code twice. We err in favor of the |
21716c07 |
332 | # first on here, this may not be as expected |
333 | foreach my $modifier (@{$modifiers}) { |
334 | return if $modifier == $method; |
335 | } |
fb1e11d5 |
336 | |
21716c07 |
337 | push @{$modifiers} => $method; |
338 | }); |
fb1e11d5 |
339 | |
21716c07 |
340 | } |
1331430a |
341 | |
21716c07 |
342 | ## ------------------------------------------------------------------ |
343 | ## override method mofidiers |
0558683c |
344 | |
fb1e11d5 |
345 | $META->add_attribute('override_method_modifiers' => ( |
346 | reader => 'get_override_method_modifiers_map', |
347 | default => sub { {} } |
348 | )); |
349 | |
21716c07 |
350 | # NOTE: |
fb1e11d5 |
351 | # these are a little different because there |
21716c07 |
352 | # can only be one per name, whereas the other |
353 | # method modifiers can have multiples. |
354 | # - SL |
0558683c |
355 | |
21716c07 |
356 | sub add_override_method_modifier { |
357 | my ($self, $method_name, $method) = @_; |
358 | (!$self->has_method($method_name)) |
c245d69b |
359 | || Moose->throw_error("Cannot add an override of method '$method_name' " . |
4c0b3599 |
360 | "because there is a local version of '$method_name'"); |
fb1e11d5 |
361 | $self->get_override_method_modifiers_map->{$method_name} = $method; |
21716c07 |
362 | } |
0558683c |
363 | |
21716c07 |
364 | sub has_override_method_modifier { |
365 | my ($self, $method_name) = @_; |
366 | # NOTE: |
fb1e11d5 |
367 | # for now we assume that if it exists,.. |
21716c07 |
368 | # it has at least one modifier in it |
fb1e11d5 |
369 | (exists $self->get_override_method_modifiers_map->{$method_name}) ? 1 : 0; |
21716c07 |
370 | } |
0558683c |
371 | |
21716c07 |
372 | sub get_override_method_modifier { |
373 | my ($self, $method_name) = @_; |
fb1e11d5 |
374 | $self->get_override_method_modifiers_map->{$method_name}; |
21716c07 |
375 | } |
0558683c |
376 | |
21716c07 |
377 | ## general list accessor ... |
80572233 |
378 | |
21716c07 |
379 | sub get_method_modifier_list { |
380 | my ($self, $modifier_type) = @_; |
fb1e11d5 |
381 | my $accessor = "get_${modifier_type}_method_modifiers_map"; |
21716c07 |
382 | keys %{$self->$accessor}; |
383 | } |
e185c027 |
384 | |
699a2e32 |
385 | sub _meta_method_class { 'Moose::Meta::Method::Meta' } |
e606ae5f |
386 | |
21716c07 |
387 | ## ------------------------------------------------------------------ |
80572233 |
388 | ## subroles |
389 | |
278ca49c |
390 | $META->add_attribute('roles' => ( |
21716c07 |
391 | reader => 'get_roles', |
392 | default => sub { [] } |
393 | )); |
394 | |
80572233 |
395 | sub add_role { |
396 | my ($self, $role) = @_; |
397 | (blessed($role) && $role->isa('Moose::Meta::Role')) |
c245d69b |
398 | || Moose->throw_error("Roles must be instances of Moose::Meta::Role"); |
80572233 |
399 | push @{$self->get_roles} => $role; |
e606ae5f |
400 | $self->reset_package_cache_flag; |
80572233 |
401 | } |
402 | |
b8aeb4dc |
403 | sub calculate_all_roles { |
404 | my $self = shift; |
405 | my %seen; |
fb1e11d5 |
406 | grep { |
407 | !$seen{$_->name}++ |
408 | } ($self, map { |
409 | $_->calculate_all_roles |
410 | } @{ $self->get_roles }); |
b8aeb4dc |
411 | } |
412 | |
80572233 |
413 | sub does_role { |
560c498d |
414 | my ($self, $role) = @_; |
415 | (defined $role) |
c245d69b |
416 | || Moose->throw_error("You must supply a role name to look for"); |
560c498d |
417 | my $role_name = blessed $role ? $role->name : $role; |
bdabd620 |
418 | # if we are it,.. then return true |
419 | return 1 if $role_name eq $self->name; |
420 | # otherwise.. check our children |
80572233 |
421 | foreach my $role (@{$self->get_roles}) { |
bdabd620 |
422 | return 1 if $role->does_role($role_name); |
80572233 |
423 | } |
424 | return 0; |
425 | } |
426 | |
1db8ecc7 |
427 | sub find_method_by_name { (shift)->get_method(@_) } |
093b12c2 |
428 | |
21716c07 |
429 | ## ------------------------------------------------------------------ |
fb1e11d5 |
430 | ## role construction |
21716c07 |
431 | ## ------------------------------------------------------------------ |
e185c027 |
432 | |
21716c07 |
433 | sub apply { |
f315aab3 |
434 | my ($self, $other, %args) = @_; |
bca01282 |
435 | |
436 | (blessed($other)) |
c245d69b |
437 | || Moose->throw_error("You must pass in an blessed instance"); |
d03bd989 |
438 | |
07de7559 |
439 | my $application_class; |
1c9db35c |
440 | if ($other->isa('Moose::Meta::Role')) { |
07de7559 |
441 | $application_class = $self->application_to_role_class; |
1c9db35c |
442 | } |
443 | elsif ($other->isa('Moose::Meta::Class')) { |
07de7559 |
444 | $application_class = $self->application_to_class_class; |
d03bd989 |
445 | } |
1c9db35c |
446 | else { |
07de7559 |
447 | $application_class = $self->application_to_instance_class; |
d03bd989 |
448 | } |
07de7559 |
449 | |
450 | Class::MOP::load_class($application_class); |
4c52e860 |
451 | |
452 | my $deprecation_check = 0; |
453 | |
454 | if ( exists $args{excludes} && !exists $args{'-excludes'} ) { |
455 | $args{'-excludes'} = delete $args{excludes}; |
456 | $deprecation_check = 1; |
457 | } |
458 | if ( exists $args{alias} && !exists $args{'-alias'} ) { |
459 | $args{'-alias'} = delete $args{alias}; |
460 | $deprecation_check = 1; |
461 | } |
462 | |
463 | if ( $deprecation_check ) { |
4c52e860 |
464 | Moose::Deprecated::deprecated( |
465 | feature => 'alias or excludes', |
466 | message => |
467 | 'The alias and excludes options for role application'. |
468 | ' have been renamed -alias and -excludes'. |
469 | " (${\$other->name} is consuming ${\$self->name}". |
14bda293 |
470 | " - do you need to upgrade ${\$other->name}?).". |
471 | ' This will be an error in Moose 2.0200.' |
4c52e860 |
472 | ); |
473 | } |
474 | |
475 | if ( exists $args{'-excludes'} ) { |
4c52e860 |
476 | # I wish we had coercion here :) |
477 | $args{'-excludes'} = ( |
478 | ref $args{'-excludes'} eq 'ARRAY' |
479 | ? $args{'-excludes'} |
480 | : [ $args{'-excludes'} ] |
481 | ); |
482 | } |
483 | |
f315aab3 |
484 | return $application_class->new(%args)->apply($self, $other, \%args); |
0558683c |
485 | } |
486 | |
4701ceff |
487 | sub composition_class_roles { } |
488 | |
21716c07 |
489 | sub combine { |
a4e516f6 |
490 | my ($class, @role_specs) = @_; |
d03bd989 |
491 | |
d03bd989 |
492 | require Moose::Meta::Role::Composite; |
493 | |
28412c0b |
494 | my (@roles, %role_params); |
495 | while (@role_specs) { |
560c498d |
496 | my ($role, $params) = @{ splice @role_specs, 0, 1 }; |
497 | my $requested_role |
498 | = blessed $role |
499 | ? $role |
500 | : Class::MOP::class_of($role); |
31d96c3e |
501 | |
6bdef412 |
502 | my $actual_role = $requested_role->_role_for_combination($params); |
31d96c3e |
503 | push @roles => $actual_role; |
504 | |
28412c0b |
505 | next unless defined $params; |
31d96c3e |
506 | $role_params{$actual_role->name} = $params; |
28412c0b |
507 | } |
d03bd989 |
508 | |
fb1e11d5 |
509 | my $c = Moose::Meta::Role::Composite->new(roles => \@roles); |
7071e2cb |
510 | return $c->apply_params(\%role_params); |
0558683c |
511 | } |
512 | |
6bdef412 |
513 | sub _role_for_combination { |
436d7a28 |
514 | my ($self, $params) = @_; |
515 | return $self; |
516 | } |
517 | |
b6a00b82 |
518 | sub create { |
2d5f3fab |
519 | my ( $role, $package_name, %options ) = @_; |
b6a00b82 |
520 | |
2d5f3fab |
521 | $options{package} = $package_name; |
b6a00b82 |
522 | |
523 | (ref $options{attributes} eq 'HASH') |
524 | || confess "You must pass a HASH ref of attributes" |
525 | if exists $options{attributes}; |
526 | |
527 | (ref $options{methods} eq 'HASH') |
528 | || confess "You must pass a HASH ref of methods" |
529 | if exists $options{methods}; |
530 | |
2937ed18 |
531 | $options{meta_name} = 'meta' |
532 | unless exists $options{meta_name}; |
533 | |
2d5f3fab |
534 | my (%initialize_options) = %options; |
b6a00b82 |
535 | delete @initialize_options{qw( |
536 | package |
537 | attributes |
538 | methods |
2937ed18 |
539 | meta_name |
b6a00b82 |
540 | version |
541 | authority |
542 | )}; |
543 | |
544 | my $meta = $role->initialize( $package_name => %initialize_options ); |
545 | |
6a4a7c31 |
546 | $meta->_instantiate_module( $options{version}, $options{authority} ); |
547 | |
2937ed18 |
548 | $meta->_add_meta_method($options{meta_name}) |
549 | if defined $options{meta_name}; |
b6a00b82 |
550 | |
551 | if (exists $options{attributes}) { |
552 | foreach my $attribute_name (keys %{$options{attributes}}) { |
553 | my $attr = $options{attributes}->{$attribute_name}; |
f785aad8 |
554 | $meta->add_attribute( |
555 | $attribute_name => blessed $attr ? $attr : %{$attr} ); |
b6a00b82 |
556 | } |
557 | } |
558 | |
559 | if (exists $options{methods}) { |
560 | foreach my $method_name (keys %{$options{methods}}) { |
561 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
562 | } |
563 | } |
564 | |
565 | return $meta; |
566 | } |
567 | |
c23885b1 |
568 | sub consumers { |
569 | my $self = shift; |
570 | my @consumers; |
571 | for my $meta (Class::MOP::get_all_metaclass_instances) { |
572 | next if $meta->name eq $self->name; |
573 | next unless $meta->isa('Moose::Meta::Class') |
574 | || $meta->isa('Moose::Meta::Role'); |
575 | push @consumers, $meta->name |
576 | if $meta->does_role($self->name); |
577 | } |
578 | return @consumers; |
579 | } |
580 | |
c9ee520d |
581 | # anonymous roles. most of it is copied straight out of Class::MOP::Class. |
582 | # an intrepid hacker might find great riches if he unifies this code with that |
583 | # code in Class::MOP::Module or Class::MOP::Package |
584 | { |
585 | # NOTE: |
586 | # this should be sufficient, if you have a |
587 | # use case where it is not, write a test and |
588 | # I will change it. |
589 | my $ANON_ROLE_SERIAL = 0; |
590 | |
591 | # NOTE: |
592 | # we need a sufficiently annoying prefix |
593 | # this should suffice for now, this is |
594 | # used in a couple of places below, so |
595 | # need to put it up here for now. |
596 | my $ANON_ROLE_PREFIX = 'Moose::Meta::Role::__ANON__::SERIAL::'; |
597 | |
598 | sub is_anon_role { |
599 | my $self = shift; |
600 | no warnings 'uninitialized'; |
601 | $self->name =~ /^$ANON_ROLE_PREFIX/; |
602 | } |
603 | |
604 | sub create_anon_role { |
605 | my ($role, %options) = @_; |
6f73c555 |
606 | $options{weaken} = 1 unless exists $options{weaken}; |
c9ee520d |
607 | my $package_name = $ANON_ROLE_PREFIX . ++$ANON_ROLE_SERIAL; |
608 | return $role->create($package_name, %options); |
609 | } |
610 | |
611 | # NOTE: |
612 | # this will only get called for |
613 | # anon-roles, all other calls |
614 | # are assumed to occur during |
615 | # global destruction and so don't |
616 | # really need to be handled explicitly |
617 | sub DESTROY { |
618 | my $self = shift; |
619 | |
963c24e1 |
620 | return if in_global_destruction(); # it'll happen soon anyway and this just makes things more complicated |
c9ee520d |
621 | |
9e476743 |
622 | $self->free_anon_role |
623 | if $self->is_anon_role; |
624 | } |
625 | |
626 | sub free_anon_role { |
627 | my $self = shift; |
628 | my $name = $self->name; |
629 | |
630 | my ($first_fragments, $last_fragment) = ($name =~ /^(.*)::(.*)$/); |
c9ee520d |
631 | |
c9ee520d |
632 | # Moose does a weird thing where it replaces the metaclass for |
633 | # class when fixing metaclass incompatibility. In that case, |
634 | # we don't want to clean out the namespace now. We can detect |
635 | # that because Moose will explicitly update the singleton |
636 | # cache in Class::MOP. |
082256d0 |
637 | my $current_meta = Class::MOP::get_metaclass_by_name($self->name); |
638 | return if $current_meta ne $self; |
c9ee520d |
639 | |
c9ee520d |
640 | no strict 'refs'; |
9e476743 |
641 | @{$name . '::ISA'} = (); |
642 | %{$name . '::'} = (); |
643 | delete ${$first_fragments}{$last_fragment . '::'}; |
644 | |
645 | Class::MOP::remove_metaclass_by_name($name); |
c9ee520d |
646 | } |
647 | } |
648 | |
fb1e11d5 |
649 | ##################################################################### |
650 | ## NOTE: |
d03bd989 |
651 | ## This is Moose::Meta::Role as defined by Moose (plus the use of |
652 | ## MooseX::AttributeHelpers module). It is here as a reference to |
fb1e11d5 |
653 | ## make it easier to see what is happening above with all the meta |
654 | ## programming. - SL |
655 | ##################################################################### |
656 | # |
657 | # has 'roles' => ( |
a40b446a |
658 | # metaclass => 'Array', |
fb1e11d5 |
659 | # reader => 'get_roles', |
764a7831 |
660 | # isa => 'ArrayRef[Moose::Meta::Role]', |
fb1e11d5 |
661 | # default => sub { [] }, |
662 | # provides => { |
663 | # 'push' => 'add_role', |
664 | # } |
665 | # ); |
d03bd989 |
666 | # |
fb1e11d5 |
667 | # has 'excluded_roles_map' => ( |
a40b446a |
668 | # metaclass => 'Hash', |
fb1e11d5 |
669 | # reader => 'get_excluded_roles_map', |
670 | # isa => 'HashRef[Str]', |
671 | # provides => { |
672 | # # Not exactly set, cause it sets multiple |
673 | # 'set' => 'add_excluded_roles', |
674 | # 'keys' => 'get_excluded_roles_list', |
675 | # 'exists' => 'excludes_role', |
676 | # } |
677 | # ); |
d03bd989 |
678 | # |
fb1e11d5 |
679 | # has 'required_methods' => ( |
a40b446a |
680 | # metaclass => 'Hash', |
fb1e11d5 |
681 | # reader => 'get_required_methods_map', |
72264f10 |
682 | # isa => 'HashRef[Moose::Meta::Role::Method::Required]', |
d03bd989 |
683 | # provides => { |
684 | # # not exactly set, or delete since it works for multiple |
fb1e11d5 |
685 | # 'set' => 'add_required_methods', |
686 | # 'delete' => 'remove_required_methods', |
687 | # 'keys' => 'get_required_method_list', |
d03bd989 |
688 | # 'exists' => 'requires_method', |
fb1e11d5 |
689 | # } |
690 | # ); |
d03bd989 |
691 | # |
692 | # # the before, around and after modifiers are |
693 | # # HASH keyed by method-name, with ARRAY of |
fb1e11d5 |
694 | # # CODE refs to apply in that order |
d03bd989 |
695 | # |
fb1e11d5 |
696 | # has 'before_method_modifiers' => ( |
a40b446a |
697 | # metaclass => 'Hash', |
fb1e11d5 |
698 | # reader => 'get_before_method_modifiers_map', |
699 | # isa => 'HashRef[ArrayRef[CodeRef]]', |
700 | # provides => { |
701 | # 'keys' => 'get_before_method_modifiers', |
d03bd989 |
702 | # 'exists' => 'has_before_method_modifiers', |
703 | # # This actually makes sure there is an |
fb1e11d5 |
704 | # # ARRAY at the given key, and pushed onto |
705 | # # it. It also checks for duplicates as well |
d03bd989 |
706 | # # 'add' => 'add_before_method_modifier' |
707 | # } |
fb1e11d5 |
708 | # ); |
d03bd989 |
709 | # |
fb1e11d5 |
710 | # has 'after_method_modifiers' => ( |
a40b446a |
711 | # metaclass => 'Hash', |
fb1e11d5 |
712 | # reader =>'get_after_method_modifiers_map', |
713 | # isa => 'HashRef[ArrayRef[CodeRef]]', |
714 | # provides => { |
715 | # 'keys' => 'get_after_method_modifiers', |
d03bd989 |
716 | # 'exists' => 'has_after_method_modifiers', |
717 | # # This actually makes sure there is an |
fb1e11d5 |
718 | # # ARRAY at the given key, and pushed onto |
d03bd989 |
719 | # # it. It also checks for duplicates as well |
720 | # # 'add' => 'add_after_method_modifier' |
721 | # } |
fb1e11d5 |
722 | # ); |
d03bd989 |
723 | # |
fb1e11d5 |
724 | # has 'around_method_modifiers' => ( |
a40b446a |
725 | # metaclass => 'Hash', |
fb1e11d5 |
726 | # reader =>'get_around_method_modifiers_map', |
727 | # isa => 'HashRef[ArrayRef[CodeRef]]', |
728 | # provides => { |
729 | # 'keys' => 'get_around_method_modifiers', |
d03bd989 |
730 | # 'exists' => 'has_around_method_modifiers', |
731 | # # This actually makes sure there is an |
fb1e11d5 |
732 | # # ARRAY at the given key, and pushed onto |
d03bd989 |
733 | # # it. It also checks for duplicates as well |
734 | # # 'add' => 'add_around_method_modifier' |
735 | # } |
fb1e11d5 |
736 | # ); |
d03bd989 |
737 | # |
fb1e11d5 |
738 | # # override is similar to the other modifiers |
739 | # # except that it is not an ARRAY of code refs |
740 | # # but instead just a single name->code mapping |
d03bd989 |
741 | # |
fb1e11d5 |
742 | # has 'override_method_modifiers' => ( |
a40b446a |
743 | # metaclass => 'Hash', |
fb1e11d5 |
744 | # reader =>'get_override_method_modifiers_map', |
d03bd989 |
745 | # isa => 'HashRef[CodeRef]', |
fb1e11d5 |
746 | # provides => { |
747 | # 'keys' => 'get_override_method_modifier', |
d03bd989 |
748 | # 'exists' => 'has_override_method_modifier', |
749 | # 'add' => 'add_override_method_modifier', # checks for local method .. |
fb1e11d5 |
750 | # } |
751 | # ); |
d03bd989 |
752 | # |
fb1e11d5 |
753 | ##################################################################### |
754 | |
755 | |
e185c027 |
756 | 1; |
757 | |
ad46f524 |
758 | # ABSTRACT: The Moose Role metaclass |
759 | |
e185c027 |
760 | __END__ |
761 | |
762 | =pod |
763 | |
e185c027 |
764 | =head1 DESCRIPTION |
765 | |
705d4cfd |
766 | This class is a subclass of L<Class::MOP::Module> that provides |
767 | additional Moose-specific functionality. |
768 | |
769 | It's API looks a lot like L<Moose::Meta::Class>, but internally it |
770 | implements many things differently. This may change in the future. |
79592a54 |
771 | |
cf3bb5c5 |
772 | =head1 INHERITANCE |
773 | |
774 | C<Moose::Meta::Role> is a subclass of L<Class::MOP::Module>. |
775 | |
e185c027 |
776 | =head1 METHODS |
777 | |
705d4cfd |
778 | =head2 Construction |
779 | |
e185c027 |
780 | =over 4 |
781 | |
705d4cfd |
782 | =item B<< Moose::Meta::Role->initialize($role_name) >> |
e185c027 |
783 | |
705d4cfd |
784 | This method creates a new role object with the provided name. |
e185c027 |
785 | |
705d4cfd |
786 | =item B<< Moose::Meta::Role->combine( [ $role => { ... } ], [ $role ], ... ) >> |
78cd1d3b |
787 | |
705d4cfd |
788 | This method accepts a list of array references. Each array reference |
560c498d |
789 | should contain a role name or L<Moose::Meta::Role> object as its first element. The second element is |
c8b8d92f |
790 | an optional hash reference. The hash reference can contain C<-excludes> |
791 | and C<-alias> keys to control how methods are composed from the role. |
e606ae5f |
792 | |
705d4cfd |
793 | The return value is a new L<Moose::Meta::Role::Composite> that |
794 | represents the combined roles. |
db1ab48d |
795 | |
4701ceff |
796 | =item B<< $metarole->composition_class_roles >> |
797 | |
798 | When combining multiple roles using C<combine>, this method is used to obtain a |
799 | list of role names to be applied to the L<Moose::Meta::Role::Composite> |
800 | instance returned by C<combine>. The default implementation returns an empty |
801 | list. Extensions that need to hook into role combination may wrap this method |
802 | to return additional role names. |
803 | |
705d4cfd |
804 | =item B<< Moose::Meta::Role->create($name, %options) >> |
e185c027 |
805 | |
705d4cfd |
806 | This method is identical to the L<Moose::Meta::Class> C<create> |
807 | method. |
808 | |
809 | =item B<< Moose::Meta::Role->create_anon_role >> |
e185c027 |
810 | |
705d4cfd |
811 | This method is identical to the L<Moose::Meta::Class> |
812 | C<create_anon_class> method. |
e185c027 |
813 | |
705d4cfd |
814 | =item B<< $metarole->is_anon_role >> |
e185c027 |
815 | |
705d4cfd |
816 | Returns true if the role is an anonymous role. |
e185c027 |
817 | |
c23885b1 |
818 | =item B<< $metarole->consumers >> |
819 | |
820 | Returns a list of names of classes and roles which consume this role. |
821 | |
e185c027 |
822 | =back |
823 | |
705d4cfd |
824 | =head2 Role application |
825 | |
e185c027 |
826 | =over 4 |
827 | |
705d4cfd |
828 | =item B<< $metarole->apply( $thing, @options ) >> |
80572233 |
829 | |
705d4cfd |
830 | This method applies a role to the given C<$thing>. That can be another |
831 | L<Moose::Meta::Role>, object, a L<Moose::Meta::Class> object, or a |
832 | (non-meta) object instance. |
80572233 |
833 | |
705d4cfd |
834 | The options are passed directly to the constructor for the appropriate |
835 | L<Moose::Meta::Role::Application> subclass. |
80572233 |
836 | |
d05235e1 |
837 | Note that this will apply the role even if the C<$thing> in question already |
838 | C<does> this role. L<Moose::Util/does_role> is a convenient wrapper for |
839 | finding out if role application is necessary. |
840 | |
80572233 |
841 | =back |
842 | |
705d4cfd |
843 | =head2 Roles and other roles |
844 | |
80572233 |
845 | =over 4 |
846 | |
705d4cfd |
847 | =item B<< $metarole->get_roles >> |
d79e62fd |
848 | |
705d4cfd |
849 | This returns an array reference of roles which this role does. This |
850 | list may include duplicates. |
d79e62fd |
851 | |
705d4cfd |
852 | =item B<< $metarole->calculate_all_roles >> |
d79e62fd |
853 | |
705d4cfd |
854 | This returns a I<unique> list of all roles that this role does, and |
855 | all the roles that its roles do. |
d79e62fd |
856 | |
560c498d |
857 | =item B<< $metarole->does_role($role) >> |
2b14ac61 |
858 | |
560c498d |
859 | Given a role I<name> or L<Moose::Meta::Role> object, returns true if this role |
860 | does the given role. |
d79e62fd |
861 | |
705d4cfd |
862 | =item B<< $metarole->add_role($role) >> |
d79e62fd |
863 | |
705d4cfd |
864 | Given a L<Moose::Meta::Role> object, this adds the role to the list of |
865 | roles that the role does. |
68efb014 |
866 | |
705d4cfd |
867 | =item B<< $metarole->get_excluded_roles_list >> |
be4427d0 |
868 | |
705d4cfd |
869 | Returns a list of role names which this role excludes. |
e185c027 |
870 | |
705d4cfd |
871 | =item B<< $metarole->excludes_role($role_name) >> |
e185c027 |
872 | |
705d4cfd |
873 | Given a role I<name>, returns true if this role excludes the named |
874 | role. |
e606ae5f |
875 | |
705d4cfd |
876 | =item B<< $metarole->add_excluded_roles(@role_names) >> |
e606ae5f |
877 | |
705d4cfd |
878 | Given one or more role names, adds those roles to the list of excluded |
879 | roles. |
bdabd620 |
880 | |
705d4cfd |
881 | =back |
e185c027 |
882 | |
705d4cfd |
883 | =head2 Methods |
093b12c2 |
884 | |
705d4cfd |
885 | The methods for dealing with a role's methods are all identical in API |
886 | and behavior to the same methods in L<Class::MOP::Class>. |
638853cb |
887 | |
705d4cfd |
888 | =over 4 |
53dd42d8 |
889 | |
705d4cfd |
890 | =item B<< $metarole->method_metaclass >> |
e185c027 |
891 | |
705d4cfd |
892 | Returns the method metaclass name for the role. This defaults to |
893 | L<Moose::Meta::Role::Method>. |
e185c027 |
894 | |
705d4cfd |
895 | =item B<< $metarole->get_method($name) >> |
e185c027 |
896 | |
705d4cfd |
897 | =item B<< $metarole->has_method($name) >> |
e185c027 |
898 | |
705d4cfd |
899 | =item B<< $metarole->add_method( $name, $body ) >> |
e185c027 |
900 | |
705d4cfd |
901 | =item B<< $metarole->get_method_list >> |
e185c027 |
902 | |
705d4cfd |
903 | =item B<< $metarole->find_method_by_name($name) >> |
904 | |
905 | These methods are all identical to the methods of the same name in |
8f6cbfcd |
906 | L<Class::MOP::Package> |
e185c027 |
907 | |
908 | =back |
909 | |
705d4cfd |
910 | =head2 Attributes |
911 | |
912 | As with methods, the methods for dealing with a role's attribute are |
913 | all identical in API and behavior to the same methods in |
914 | L<Class::MOP::Class>. |
915 | |
916 | However, attributes stored in this class are I<not> stored as |
917 | objects. Rather, the attribute definition is stored as a hash |
918 | reference. When a role is composed into a class, this hash reference |
919 | is passed directly to the metaclass's C<add_attribute> method. |
920 | |
921 | This is quite likely to change in the future. |
922 | |
e185c027 |
923 | =over 4 |
924 | |
705d4cfd |
925 | =item B<< $metarole->get_attribute($attribute_name) >> |
926 | |
927 | =item B<< $metarole->has_attribute($attribute_name) >> |
1331430a |
928 | |
705d4cfd |
929 | =item B<< $metarole->get_attribute_list >> |
1331430a |
930 | |
705d4cfd |
931 | =item B<< $metarole->add_attribute($name, %options) >> |
1331430a |
932 | |
705d4cfd |
933 | =item B<< $metarole->remove_attribute($attribute_name) >> |
1331430a |
934 | |
935 | =back |
936 | |
705d4cfd |
937 | =head2 Required methods |
938 | |
0558683c |
939 | =over 4 |
940 | |
705d4cfd |
941 | =item B<< $metarole->get_required_method_list >> |
0558683c |
942 | |
705d4cfd |
943 | Returns the list of methods required by the role. |
0558683c |
944 | |
705d4cfd |
945 | =item B<< $metarole->requires_method($name) >> |
0558683c |
946 | |
705d4cfd |
947 | Returns true if the role requires the named method. |
0558683c |
948 | |
0ecff16b |
949 | =item B<< $metarole->add_required_methods(@names) >> |
0558683c |
950 | |
b3c1586a |
951 | Adds the named methods to the role's list of required methods. |
0558683c |
952 | |
705d4cfd |
953 | =item B<< $metarole->remove_required_methods(@names) >> |
0558683c |
954 | |
2dda1d28 |
955 | Removes the named methods from the role's list of required methods. |
0558683c |
956 | |
bb153262 |
957 | =item B<< $metarole->add_conflicting_method(%params) >> |
09eeab06 |
958 | |
bb153262 |
959 | Instantiate the parameters as a L<Moose::Meta::Role::Method::Conflicting> |
09eeab06 |
960 | object, then add it to the required method list. |
961 | |
705d4cfd |
962 | =back |
963 | |
964 | =head2 Method modifiers |
0558683c |
965 | |
fa907f2e |
966 | These methods act like their counterparts in L<Class::MOP::Class> and |
705d4cfd |
967 | L<Moose::Meta::Class>. |
968 | |
969 | However, method modifiers are simply stored internally, and are not |
970 | applied until the role itself is applied to a class. |
0558683c |
971 | |
972 | =over 4 |
973 | |
705d4cfd |
974 | =item B<< $metarole->add_after_method_modifier($method_name, $method) >> |
0558683c |
975 | |
705d4cfd |
976 | =item B<< $metarole->add_around_method_modifier($method_name, $method) >> |
0558683c |
977 | |
705d4cfd |
978 | =item B<< $metarole->add_before_method_modifier($method_name, $method) >> |
0558683c |
979 | |
705d4cfd |
980 | =item B<< $metarole->add_override_method_modifier($method_name, $method) >> |
0558683c |
981 | |
705d4cfd |
982 | These methods all add an appropriate modifier to the internal list of |
983 | modifiers. |
0558683c |
984 | |
705d4cfd |
985 | =item B<< $metarole->has_after_method_modifiers >> |
0558683c |
986 | |
705d4cfd |
987 | =item B<< $metarole->has_around_method_modifiers >> |
988 | |
989 | =item B<< $metarole->has_before_method_modifiers >> |
990 | |
991 | =item B<< $metarole->has_override_method_modifier >> |
0558683c |
992 | |
705d4cfd |
993 | Return true if the role has any modifiers of the given type. |
0558683c |
994 | |
705d4cfd |
995 | =item B<< $metarole->get_after_method_modifiers($method_name) >> |
0558683c |
996 | |
705d4cfd |
997 | =item B<< $metarole->get_around_method_modifiers($method_name) >> |
0558683c |
998 | |
705d4cfd |
999 | =item B<< $metarole->get_before_method_modifiers($method_name) >> |
0558683c |
1000 | |
705d4cfd |
1001 | Given a method name, returns a list of the appropriate modifiers for |
1002 | that method. |
1003 | |
1004 | =item B<< $metarole->get_override_method_modifier($method_name) >> |
1005 | |
1006 | Given a method name, returns the override method modifier for that |
1007 | method, if it has one. |
0558683c |
1008 | |
1009 | =back |
1010 | |
705d4cfd |
1011 | =head2 Introspection |
505065c4 |
1012 | |
705d4cfd |
1013 | =over 4 |
505065c4 |
1014 | |
705d4cfd |
1015 | =item B<< Moose::Meta::Role->meta >> |
505065c4 |
1016 | |
705d4cfd |
1017 | This will return a L<Class::MOP::Class> instance for this class. |
505065c4 |
1018 | |
1019 | =back |
1020 | |
e185c027 |
1021 | =head1 BUGS |
1022 | |
d4048ef3 |
1023 | See L<Moose/BUGS> for details on reporting bugs. |
e185c027 |
1024 | |
b8aeb4dc |
1025 | =cut |