Commit | Line | Data |
c0e30cf5 |
1 | |
2 | package Moose::Meta::Class; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
0addec44 |
7 | use Class::MOP; |
648e79ae |
8 | |
11c86f15 |
9 | use Carp (); |
f8b6827f |
10 | use List::Util qw( first ); |
8b1d510f |
11 | use List::MoreUtils qw( any all uniq ); |
21f1e231 |
12 | use Scalar::Util 'weaken', 'blessed'; |
a15dff8d |
13 | |
75d2da34 |
14 | our $VERSION = '0.77'; |
e606ae5f |
15 | $VERSION = eval $VERSION; |
d44714be |
16 | our $AUTHORITY = 'cpan:STEVAN'; |
bc1e29b5 |
17 | |
74862722 |
18 | use Moose::Meta::Method::Overridden; |
3f9e4b0a |
19 | use Moose::Meta::Method::Augmented; |
bf6fa6b3 |
20 | use Moose::Error::Default; |
0fa70d03 |
21 | use Moose::Meta::Class::Immutable::Trait; |
22 | use Moose::Meta::Method::Constructor; |
23 | use Moose::Meta::Method::Destructor; |
8ee73eeb |
24 | |
c0e30cf5 |
25 | use base 'Class::MOP::Class'; |
26 | |
598340d5 |
27 | __PACKAGE__->meta->add_attribute('roles' => ( |
ef333f17 |
28 | reader => 'roles', |
29 | default => sub { [] } |
30 | )); |
31 | |
a9b63d79 |
32 | __PACKAGE__->meta->add_attribute('role_applications' => ( |
639f9a1a |
33 | reader => '_get_role_applications', |
a9b63d79 |
34 | default => sub { [] } |
35 | )); |
36 | |
0fa70d03 |
37 | __PACKAGE__->meta->add_attribute( |
38 | Class::MOP::Attribute->new('immutable_trait' => ( |
39 | accessor => "immutable_trait", |
40 | default => 'Moose::Meta::Class::Immutable::Trait', |
41 | )) |
42 | ); |
43 | |
e606ae5f |
44 | __PACKAGE__->meta->add_attribute('constructor_class' => ( |
45 | accessor => 'constructor_class', |
e0001338 |
46 | default => 'Moose::Meta::Method::Constructor', |
e606ae5f |
47 | )); |
48 | |
49 | __PACKAGE__->meta->add_attribute('destructor_class' => ( |
50 | accessor => 'destructor_class', |
e0001338 |
51 | default => 'Moose::Meta::Method::Destructor', |
e606ae5f |
52 | )); |
53 | |
11c86f15 |
54 | __PACKAGE__->meta->add_attribute('error_class' => ( |
bf6fa6b3 |
55 | accessor => 'error_class', |
56 | default => 'Moose::Error::Default', |
11c86f15 |
57 | )); |
58 | |
590868a3 |
59 | sub initialize { |
60 | my $class = shift; |
61 | my $pkg = shift; |
d03bd989 |
62 | return Class::MOP::get_metaclass_by_name($pkg) |
685f7e44 |
63 | || $class->SUPER::initialize($pkg, |
64 | 'attribute_metaclass' => 'Moose::Meta::Attribute', |
65 | 'method_metaclass' => 'Moose::Meta::Method', |
66 | 'instance_metaclass' => 'Moose::Meta::Instance', |
67 | @_ |
d03bd989 |
68 | ); |
ac2dc464 |
69 | } |
590868a3 |
70 | |
0fa70d03 |
71 | sub _immutable_options { |
72 | my ( $self, @args ) = @_; |
73 | |
74 | $self->SUPER::_immutable_options( |
75 | inline_destructor => 1, |
76 | |
77 | # Moose always does this when an attribute is created |
78 | inline_accessors => 0, |
79 | |
80 | @args, |
81 | ); |
82 | } |
83 | |
61bdd94f |
84 | sub create { |
85 | my ($self, $package_name, %options) = @_; |
d03bd989 |
86 | |
61bdd94f |
87 | (ref $options{roles} eq 'ARRAY') |
11c86f15 |
88 | || $self->throw_error("You must pass an ARRAY ref of roles", data => $options{roles}) |
61bdd94f |
89 | if exists $options{roles}; |
310ba883 |
90 | my $roles = delete $options{roles}; |
dd37a5be |
91 | |
61bdd94f |
92 | my $class = $self->SUPER::create($package_name, %options); |
dd37a5be |
93 | |
310ba883 |
94 | if ($roles) { |
95 | Moose::Util::apply_all_roles( $class, @$roles ); |
61bdd94f |
96 | } |
d03bd989 |
97 | |
61bdd94f |
98 | return $class; |
99 | } |
100 | |
6a4a7c31 |
101 | sub _check_metaclass_compatibility { |
2b72f3b4 |
102 | my $self = shift; |
103 | |
104 | if ( my @supers = $self->superclasses ) { |
105 | $self->_fix_metaclass_incompatibility(@supers); |
106 | } |
107 | |
6a4a7c31 |
108 | $self->SUPER::_check_metaclass_compatibility(@_); |
2b72f3b4 |
109 | } |
110 | |
17594769 |
111 | my %ANON_CLASSES; |
112 | |
113 | sub create_anon_class { |
114 | my ($self, %options) = @_; |
115 | |
116 | my $cache_ok = delete $options{cache}; |
d03bd989 |
117 | |
17594769 |
118 | # something like Super::Class|Super::Class::2=Role|Role::1 |
119 | my $cache_key = join '=' => ( |
11aaed6c |
120 | join('|', @{$options{superclasses} || []}), |
121 | join('|', sort @{$options{roles} || []}), |
17594769 |
122 | ); |
d03bd989 |
123 | |
6d5cbd2b |
124 | if ($cache_ok && defined $ANON_CLASSES{$cache_key}) { |
17594769 |
125 | return $ANON_CLASSES{$cache_key}; |
126 | } |
d03bd989 |
127 | |
17594769 |
128 | my $new_class = $self->SUPER::create_anon_class(%options); |
129 | |
6d5cbd2b |
130 | $ANON_CLASSES{$cache_key} = $new_class |
131 | if $cache_ok; |
17594769 |
132 | |
133 | return $new_class; |
134 | } |
135 | |
ef333f17 |
136 | sub add_role { |
137 | my ($self, $role) = @_; |
138 | (blessed($role) && $role->isa('Moose::Meta::Role')) |
11c86f15 |
139 | || $self->throw_error("Roles must be instances of Moose::Meta::Role", data => $role); |
ef333f17 |
140 | push @{$self->roles} => $role; |
141 | } |
142 | |
639f9a1a |
143 | sub role_applications { |
144 | my ($self) = @_; |
145 | |
146 | return @{$self->_get_role_applications}; |
147 | } |
148 | |
a9b63d79 |
149 | sub add_role_application { |
150 | my ($self, $application) = @_; |
151 | (blessed($application) && $application->isa('Moose::Meta::Role::Application::ToClass')) |
152 | || $self->throw_error("Role applications must be instances of Moose::Meta::Role::Application::ToClass", data => $application); |
639f9a1a |
153 | push @{$self->_get_role_applications} => $application; |
a9b63d79 |
154 | } |
155 | |
b8aeb4dc |
156 | sub calculate_all_roles { |
157 | my $self = shift; |
158 | my %seen; |
159 | grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles }; |
160 | } |
161 | |
ef333f17 |
162 | sub does_role { |
163 | my ($self, $role_name) = @_; |
322abb07 |
164 | |
ef333f17 |
165 | (defined $role_name) |
11c86f15 |
166 | || $self->throw_error("You must supply a role name to look for"); |
322abb07 |
167 | |
9c429218 |
168 | foreach my $class ($self->class_precedence_list) { |
322abb07 |
169 | my $meta = Class::MOP::class_of($class); |
3d0f5a27 |
170 | # when a Moose metaclass is itself extended with a role, |
171 | # this check needs to be done since some items in the |
172 | # class_precedence_list might in fact be Class::MOP |
173 | # based still. |
322abb07 |
174 | next unless $meta && $meta->can('roles'); |
175 | foreach my $role (@{$meta->roles}) { |
9c429218 |
176 | return 1 if $role->does_role($role_name); |
177 | } |
ef333f17 |
178 | } |
179 | return 0; |
180 | } |
181 | |
d79e62fd |
182 | sub excludes_role { |
183 | my ($self, $role_name) = @_; |
ebfc4d0f |
184 | |
d79e62fd |
185 | (defined $role_name) |
11c86f15 |
186 | || $self->throw_error("You must supply a role name to look for"); |
ebfc4d0f |
187 | |
ac2dc464 |
188 | foreach my $class ($self->class_precedence_list) { |
ebfc4d0f |
189 | my $meta = Class::MOP::class_of($class); |
190 | # when a Moose metaclass is itself extended with a role, |
191 | # this check needs to be done since some items in the |
192 | # class_precedence_list might in fact be Class::MOP |
193 | # based still. |
194 | next unless $meta && $meta->can('roles'); |
195 | foreach my $role (@{$meta->roles}) { |
9c429218 |
196 | return 1 if $role->excludes_role($role_name); |
197 | } |
d79e62fd |
198 | } |
199 | return 0; |
200 | } |
201 | |
8c9d74e7 |
202 | sub new_object { |
1308deb4 |
203 | my $class = shift; |
e606ae5f |
204 | my $params = @_ == 1 ? $_[0] : {@_}; |
1308deb4 |
205 | my $self = $class->SUPER::new_object($params); |
206 | |
b2df9268 |
207 | foreach my $attr ( $class->get_all_attributes() ) { |
1308deb4 |
208 | |
209 | next unless $attr->can('has_trigger') && $attr->has_trigger; |
210 | |
211 | my $init_arg = $attr->init_arg; |
212 | |
213 | next unless defined $init_arg; |
214 | |
215 | next unless exists $params->{$init_arg}; |
216 | |
217 | $attr->trigger->( |
218 | $self, |
219 | ( |
220 | $attr->should_coerce |
221 | ? $attr->get_read_method_ref->($self) |
222 | : $params->{$init_arg} |
223 | ), |
1308deb4 |
224 | ); |
8c9d74e7 |
225 | } |
1308deb4 |
226 | |
ac2dc464 |
227 | return $self; |
8c9d74e7 |
228 | } |
229 | |
b2df9268 |
230 | sub _construct_instance { |
e606ae5f |
231 | my $class = shift; |
232 | my $params = @_ == 1 ? $_[0] : {@_}; |
ddd0ec20 |
233 | my $meta_instance = $class->get_meta_instance; |
575db57d |
234 | # FIXME: |
235 | # the code below is almost certainly incorrect |
6549b0d1 |
236 | # but this is foreign inheritance, so we might |
ac2dc464 |
237 | # have to kludge it in the end. |
e606ae5f |
238 | my $instance = $params->{'__INSTANCE__'} || $meta_instance->create_instance(); |
b2df9268 |
239 | foreach my $attr ($class->get_all_attributes()) { |
e606ae5f |
240 | $attr->initialize_instance_slot($meta_instance, $instance, $params); |
a15dff8d |
241 | } |
242 | return $instance; |
243 | } |
244 | |
e2eef3a5 |
245 | sub superclasses { |
246 | my $self = shift; |
247 | my @supers = @_; |
248 | foreach my $super (@supers) { |
249 | my $meta = Class::MOP::load_class($super); |
250 | Moose->throw_error("You cannot inherit from a Moose Role ($super)") |
251 | if $meta && $meta->isa('Moose::Meta::Role') |
252 | } |
253 | return $self->SUPER::superclasses(@supers); |
254 | } |
255 | |
093b12c2 |
256 | ### --------------------------------------------- |
257 | |
a2eec5e7 |
258 | sub add_attribute { |
259 | my $self = shift; |
e472c9a5 |
260 | $self->SUPER::add_attribute( |
261 | (blessed $_[0] && $_[0]->isa('Class::MOP::Attribute') |
d03bd989 |
262 | ? $_[0] |
263 | : $self->_process_attribute(@_)) |
e472c9a5 |
264 | ); |
a2eec5e7 |
265 | } |
266 | |
78cd1d3b |
267 | sub add_override_method_modifier { |
268 | my ($self, $name, $method, $_super_package) = @_; |
18c2ec0e |
269 | |
d05cd563 |
270 | (!$self->has_method($name)) |
11c86f15 |
271 | || $self->throw_error("Cannot add an override method if a local method is already present"); |
18c2ec0e |
272 | |
74862722 |
273 | $self->add_method($name => Moose::Meta::Method::Overridden->new( |
3f9e4b0a |
274 | method => $method, |
275 | class => $self, |
276 | package => $_super_package, # need this for roles |
277 | name => $name, |
18c2ec0e |
278 | )); |
78cd1d3b |
279 | } |
280 | |
281 | sub add_augment_method_modifier { |
ac2dc464 |
282 | my ($self, $name, $method) = @_; |
d05cd563 |
283 | (!$self->has_method($name)) |
11c86f15 |
284 | || $self->throw_error("Cannot add an augment method if a local method is already present"); |
3f9e4b0a |
285 | |
286 | $self->add_method($name => Moose::Meta::Method::Augmented->new( |
287 | method => $method, |
288 | class => $self, |
289 | name => $name, |
290 | )); |
78cd1d3b |
291 | } |
292 | |
1341f10c |
293 | ## Private Utility methods ... |
294 | |
05d9eaf6 |
295 | sub _find_next_method_by_name_which_is_not_overridden { |
296 | my ($self, $name) = @_; |
68efb014 |
297 | foreach my $method ($self->find_all_methods_by_name($name)) { |
ac2dc464 |
298 | return $method->{code} |
74862722 |
299 | if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overridden'); |
05d9eaf6 |
300 | } |
301 | return undef; |
302 | } |
303 | |
41419b9e |
304 | sub _fix_metaclass_incompatibility { |
1341f10c |
305 | my ($self, @superclasses) = @_; |
e606ae5f |
306 | |
1341f10c |
307 | foreach my $super (@superclasses) { |
f8b6827f |
308 | next if $self->_superclass_meta_is_compatible($super); |
e606ae5f |
309 | |
310 | unless ( $self->is_pristine ) { |
f8b6827f |
311 | $self->throw_error( |
312 | "Cannot attempt to reinitialize metaclass for " |
313 | . $self->name |
314 | . ", it isn't pristine" ); |
1341f10c |
315 | } |
e606ae5f |
316 | |
0635500e |
317 | $self->_reconcile_with_superclass_meta($super); |
f8b6827f |
318 | } |
f8b6827f |
319 | } |
320 | |
321 | sub _superclass_meta_is_compatible { |
322 | my ($self, $super) = @_; |
323 | |
324 | my $super_meta = Class::MOP::Class->initialize($super) |
325 | or return 1; |
326 | |
327 | next unless $super_meta->isa("Class::MOP::Class"); |
328 | |
329 | my $super_meta_name |
330 | = $super_meta->is_immutable |
331 | ? $super_meta->get_mutable_metaclass_name |
332 | : ref($super_meta); |
333 | |
334 | return 1 |
335 | if $self->isa($super_meta_name) |
336 | and |
337 | $self->instance_metaclass->isa( $super_meta->instance_metaclass ); |
338 | } |
339 | |
340 | # I don't want to have to type this >1 time |
341 | my @MetaClassTypes = |
3e334262 |
342 | qw( attribute_metaclass |
343 | method_metaclass |
344 | wrapped_method_metaclass |
345 | instance_metaclass |
346 | constructor_class |
347 | destructor_class |
348 | error_class ); |
f8b6827f |
349 | |
350 | sub _reconcile_with_superclass_meta { |
351 | my ($self, $super) = @_; |
352 | |
29782f74 |
353 | my $super_meta = Class::MOP::class_of($super); |
f8b6827f |
354 | |
dd37a5be |
355 | my $super_meta_name |
f8b6827f |
356 | = $super_meta->is_immutable |
357 | ? $super_meta->get_mutable_metaclass_name |
358 | : ref($super_meta); |
e606ae5f |
359 | |
f8b6827f |
360 | my $self_metaclass = ref $self; |
361 | |
362 | # If neither of these is true we have a more serious |
363 | # incompatibility that we just cannot fix (yet?). |
dd37a5be |
364 | if ( $super_meta_name->isa( ref $self ) |
f8b6827f |
365 | && all { $super_meta->$_->isa( $self->$_ ) } @MetaClassTypes ) { |
0635500e |
366 | $self->_reinitialize_with($super_meta); |
f8b6827f |
367 | } |
368 | elsif ( $self->_all_metaclasses_differ_by_roles_only($super_meta) ) { |
0635500e |
369 | $self->_reconcile_role_differences($super_meta); |
1341f10c |
370 | } |
1341f10c |
371 | } |
372 | |
f8b6827f |
373 | sub _reinitialize_with { |
374 | my ( $self, $new_meta ) = @_; |
375 | |
0635500e |
376 | my $new_self = $new_meta->reinitialize( |
f8b6827f |
377 | $self->name, |
378 | attribute_metaclass => $new_meta->attribute_metaclass, |
379 | method_metaclass => $new_meta->method_metaclass, |
380 | instance_metaclass => $new_meta->instance_metaclass, |
381 | ); |
382 | |
8b1d510f |
383 | $new_self->$_( $new_meta->$_ ) |
384 | for qw( constructor_class destructor_class error_class ); |
f8b6827f |
385 | |
0635500e |
386 | %$self = %$new_self; |
387 | |
388 | bless $self, ref $new_self; |
389 | |
4c5fcc12 |
390 | # We need to replace the cached metaclass instance or else when it |
391 | # goes out of scope Class::MOP::Class destroy's the namespace for |
392 | # the metaclass's class, causing much havoc. |
0635500e |
393 | Class::MOP::store_metaclass_by_name( $self->name, $self ); |
4c5fcc12 |
394 | Class::MOP::weaken_metaclass( $self->name ) if $self->is_anon_class; |
f8b6827f |
395 | } |
396 | |
397 | # In the more complex case, we share a common ancestor with our |
398 | # superclass's metaclass, but each metaclass (ours and the parent's) |
399 | # has a different set of roles applied. We reconcile this by first |
400 | # reinitializing into the parent class, and _then_ applying our own |
401 | # roles. |
402 | sub _all_metaclasses_differ_by_roles_only { |
403 | my ($self, $super_meta) = @_; |
404 | |
405 | for my $pair ( |
406 | [ ref $self, ref $super_meta ], |
407 | map { [ $self->$_, $super_meta->$_ ] } @MetaClassTypes |
408 | ) { |
409 | |
410 | next if $pair->[0] eq $pair->[1]; |
411 | |
412 | my $self_meta_meta = Class::MOP::Class->initialize( $pair->[0] ); |
413 | my $super_meta_meta = Class::MOP::Class->initialize( $pair->[1] ); |
414 | |
415 | my $common_ancestor |
416 | = _find_common_ancestor( $self_meta_meta, $super_meta_meta ); |
417 | |
418 | return unless $common_ancestor; |
419 | |
420 | return |
421 | unless _is_role_only_subclass_of( |
422 | $self_meta_meta, |
423 | $common_ancestor, |
424 | ) |
425 | && _is_role_only_subclass_of( |
426 | $super_meta_meta, |
427 | $common_ancestor, |
428 | ); |
429 | } |
430 | |
431 | return 1; |
432 | } |
433 | |
434 | # This, and some other functions, could be called as methods, but |
435 | # they're not for two reasons. One, we just end up ignoring the first |
436 | # argument, because we can't call these directly on one of the real |
437 | # arguments, because one of them could be a Class::MOP::Class object |
438 | # and not a Moose::Meta::Class. Second, only a completely insane |
439 | # person would attempt to subclass this stuff! |
440 | sub _find_common_ancestor { |
441 | my ($meta1, $meta2) = @_; |
442 | |
443 | # FIXME? This doesn't account for multiple inheritance (not sure |
444 | # if it needs to though). For example, is somewhere in $meta1's |
db9fda52 |
445 | # history it inherits from both ClassA and ClassB, and $meta2 |
f8b6827f |
446 | # inherits from ClassB & ClassA, does it matter? And what crazy |
447 | # fool would do that anyway? |
448 | |
449 | my %meta1_parents = map { $_ => 1 } $meta1->linearized_isa; |
450 | |
451 | return first { $meta1_parents{$_} } $meta2->linearized_isa; |
452 | } |
453 | |
454 | sub _is_role_only_subclass_of { |
455 | my ($meta, $ancestor) = @_; |
456 | |
457 | return 1 if $meta->name eq $ancestor; |
458 | |
459 | my @roles = _all_roles_until( $meta, $ancestor ); |
460 | |
461 | my %role_packages = map { $_->name => 1 } @roles; |
462 | |
463 | my $ancestor_meta = Class::MOP::Class->initialize($ancestor); |
464 | |
465 | my %shared_ancestors = map { $_ => 1 } $ancestor_meta->linearized_isa; |
466 | |
467 | for my $method ( $meta->get_all_methods() ) { |
468 | next if $method->name eq 'meta'; |
469 | next if $method->can('associated_attribute'); |
470 | |
471 | next |
472 | if $role_packages{ $method->original_package_name } |
473 | || $shared_ancestors{ $method->original_package_name }; |
474 | |
475 | return 0; |
476 | } |
477 | |
478 | # FIXME - this really isn't right. Just because an attribute is |
479 | # defined in a role doesn't mean it isn't _also_ defined in the |
480 | # subclass. |
481 | for my $attr ( $meta->get_all_attributes ) { |
482 | next if $shared_ancestors{ $attr->associated_class->name }; |
483 | |
484 | next if any { $_->has_attribute( $attr->name ) } @roles; |
485 | |
486 | return 0; |
487 | } |
488 | |
489 | return 1; |
490 | } |
491 | |
492 | sub _all_roles { |
493 | my $meta = shift; |
494 | |
495 | return _all_roles_until($meta); |
496 | } |
497 | |
498 | sub _all_roles_until { |
499 | my ($meta, $stop_at_class) = @_; |
500 | |
501 | return unless $meta->can('calculate_all_roles'); |
502 | |
503 | my @roles = $meta->calculate_all_roles; |
504 | |
505 | for my $class ( $meta->linearized_isa ) { |
506 | last if $stop_at_class && $stop_at_class eq $class; |
507 | |
508 | my $meta = Class::MOP::Class->initialize($class); |
509 | last unless $meta->can('calculate_all_roles'); |
510 | |
511 | push @roles, $meta->calculate_all_roles; |
512 | } |
513 | |
8b1d510f |
514 | return uniq @roles; |
f8b6827f |
515 | } |
516 | |
517 | sub _reconcile_role_differences { |
518 | my ($self, $super_meta) = @_; |
519 | |
3897e146 |
520 | my $self_meta = Class::MOP::class_of($self); |
f8b6827f |
521 | |
522 | my %roles; |
523 | |
524 | if ( my @roles = map { $_->name } _all_roles($self_meta) ) { |
525 | $roles{metaclass_roles} = \@roles; |
526 | } |
527 | |
528 | for my $thing (@MetaClassTypes) { |
529 | my $name = $self->$thing(); |
530 | |
531 | my $thing_meta = Class::MOP::Class->initialize($name); |
532 | |
533 | my @roles = map { $_->name } _all_roles($thing_meta) |
534 | or next; |
535 | |
536 | $roles{ $thing . '_roles' } = \@roles; |
537 | } |
538 | |
2b72f3b4 |
539 | $self->_reinitialize_with($super_meta); |
f8b6827f |
540 | |
541 | Moose::Util::MetaRole::apply_metaclass_roles( |
542 | for_class => $self->name, |
543 | %roles, |
544 | ); |
545 | |
546 | return $self; |
547 | } |
548 | |
1341f10c |
549 | sub _process_attribute { |
a3738e5b |
550 | my ( $self, $name, @args ) = @_; |
7e59b803 |
551 | |
552 | @args = %{$args[0]} if scalar @args == 1 && ref($args[0]) eq 'HASH'; |
d9bb6c63 |
553 | |
f9b5f5f8 |
554 | if (($name || '') =~ /^\+(.*)/) { |
7e59b803 |
555 | return $self->_process_inherited_attribute($1, @args); |
1341f10c |
556 | } |
557 | else { |
7e59b803 |
558 | return $self->_process_new_attribute($name, @args); |
559 | } |
560 | } |
561 | |
562 | sub _process_new_attribute { |
563 | my ( $self, $name, @args ) = @_; |
7e59b803 |
564 | |
d5c30e52 |
565 | $self->attribute_metaclass->interpolate_class_and_new($name, @args); |
1341f10c |
566 | } |
567 | |
568 | sub _process_inherited_attribute { |
569 | my ($self, $attr_name, %options) = @_; |
570 | my $inherited_attr = $self->find_attribute_by_name($attr_name); |
571 | (defined $inherited_attr) |
329c5dd4 |
572 | || $self->throw_error("Could not find an attribute by the name of '$attr_name' to inherit from in ${\$self->name}", data => $attr_name); |
1341f10c |
573 | if ($inherited_attr->isa('Moose::Meta::Attribute')) { |
d7d8a8c7 |
574 | return $inherited_attr->clone_and_inherit_options(%options); |
1341f10c |
575 | } |
576 | else { |
577 | # NOTE: |
578 | # kind of a kludge to handle Class::MOP::Attributes |
d7d8a8c7 |
579 | return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options); |
ac2dc464 |
580 | } |
1341f10c |
581 | } |
582 | |
5cf3dbcf |
583 | ## ------------------------------------------------- |
584 | |
bf6fa6b3 |
585 | our $error_level; |
11c86f15 |
586 | |
587 | sub throw_error { |
588 | my ( $self, @args ) = @_; |
bf6fa6b3 |
589 | local $error_level = ($error_level || 0) + 1; |
11c86f15 |
590 | $self->raise_error($self->create_error(@args)); |
591 | } |
592 | |
593 | sub raise_error { |
594 | my ( $self, @args ) = @_; |
595 | die @args; |
596 | } |
597 | |
598 | sub create_error { |
599 | my ( $self, @args ) = @_; |
600 | |
18748ad6 |
601 | require Carp::Heavy; |
602 | |
bf6fa6b3 |
603 | local $error_level = ($error_level || 0 ) + 1; |
18748ad6 |
604 | |
11c86f15 |
605 | if ( @args % 2 == 1 ) { |
606 | unshift @args, "message"; |
607 | } |
608 | |
fcab1742 |
609 | my %args = ( metaclass => $self, last_error => $@, @args ); |
11c86f15 |
610 | |
bf6fa6b3 |
611 | $args{depth} += $error_level; |
11c86f15 |
612 | |
bf6fa6b3 |
613 | my $class = ref $self ? $self->error_class : "Moose::Error::Default"; |
11c86f15 |
614 | |
a810a01f |
615 | Class::MOP::load_class($class); |
616 | |
11c86f15 |
617 | $class->new( |
bf6fa6b3 |
618 | Carp::caller_info($args{depth}), |
619 | %args |
11c86f15 |
620 | ); |
621 | } |
622 | |
c0e30cf5 |
623 | 1; |
624 | |
625 | __END__ |
626 | |
627 | =pod |
628 | |
629 | =head1 NAME |
630 | |
e522431d |
631 | Moose::Meta::Class - The Moose metaclass |
c0e30cf5 |
632 | |
c0e30cf5 |
633 | =head1 DESCRIPTION |
634 | |
70bb0f97 |
635 | This class is a subclass of L<Class::MOP::Class> that provides |
636 | additional Moose-specific functionality. |
e522431d |
637 | |
7854b409 |
638 | To really understand this class, you will need to start with the |
639 | L<Class::MOP::Class> documentation. This class can be understood as a |
640 | set of additional features on top of the basic feature provided by |
641 | that parent class. |
6ba6d68c |
642 | |
d4b1449e |
643 | =head1 INHERITANCE |
644 | |
645 | C<Moose::Meta::Class> is a subclass of L<Class::MOP::Class>. |
646 | |
c0e30cf5 |
647 | =head1 METHODS |
648 | |
649 | =over 4 |
650 | |
70bb0f97 |
651 | =item B<< Moose::Meta::Class->initialize($package_name, %options) >> |
590868a3 |
652 | |
70bb0f97 |
653 | This overrides the parent's method in order to provide its own |
654 | defaults for the C<attribute_metaclass>, C<instance_metaclass>, and |
655 | C<method_metaclass> options. |
61bdd94f |
656 | |
70bb0f97 |
657 | These all default to the appropriate Moose class. |
61bdd94f |
658 | |
70bb0f97 |
659 | =item B<< Moose::Meta::Class->create($package_name, %options) >> |
17594769 |
660 | |
70bb0f97 |
661 | This overrides the parent's method in order to accept a C<roles> |
662 | option. This should be an array reference containing one more roles |
663 | that the class does. |
17594769 |
664 | |
70bb0f97 |
665 | my $metaclass = Moose::Meta::Class->create( 'New::Class', roles => [...] ); |
17594769 |
666 | |
70bb0f97 |
667 | =item B<< Moose::Meta::Class->create_anon_class >> |
17594769 |
668 | |
70bb0f97 |
669 | This overrides the parent's method to accept a C<roles> option, just |
670 | as C<create> does. |
5cf3dbcf |
671 | |
70bb0f97 |
672 | It also accepts a C<cache> option. If this is true, then the anonymous |
673 | class will be cached based on its superclasses and roles. If an |
674 | existing anonymous class in the cache has the same superclasses and |
675 | roles, it will be reused. |
ac2dc464 |
676 | |
70bb0f97 |
677 | my $metaclass = Moose::Meta::Class->create_anon_class( |
678 | superclasses => ['Foo'], |
679 | roles => [qw/Some Roles Go Here/], |
680 | cache => 1, |
681 | ); |
ac2dc464 |
682 | |
70bb0f97 |
683 | =item B<< $metaclass->make_immutable(%options) >> |
ac2dc464 |
684 | |
70bb0f97 |
685 | This overrides the parent's method to add a few options. Specifically, |
686 | it uses the Moose-specific constructor and destructor classes, and |
687 | enables inlining the destructor. |
8c9d74e7 |
688 | |
70bb0f97 |
689 | Also, since Moose always inlines attributes, it sets the |
690 | C<inline_accessors> option to false. |
02a0fb52 |
691 | |
70bb0f97 |
692 | =item B<< $metaclass->new_object(%params) >> |
a15dff8d |
693 | |
70bb0f97 |
694 | This overrides the parent's method in order to add support for |
695 | attribute triggers. |
6ba6d68c |
696 | |
70bb0f97 |
697 | =item B<< $metaclass->add_override_method_modifier($name, $sub) >> |
ef1d5f4b |
698 | |
70bb0f97 |
699 | This adds an C<override> method modifier to the package. |
e9ec68d6 |
700 | |
70bb0f97 |
701 | =item B<< $metaclass->add_augment_method_modifier($name, $sub) >> |
e9ec68d6 |
702 | |
70bb0f97 |
703 | This adds an C<augment> method modifier to the package. |
78cd1d3b |
704 | |
70bb0f97 |
705 | =item B<< $metaclass->calculate_all_roles >> |
02a0fb52 |
706 | |
70bb0f97 |
707 | This will return a unique array of C<Moose::Meta::Role> instances |
708 | which are attached to this class. |
78cd1d3b |
709 | |
70bb0f97 |
710 | =item B<< $metaclass->add_role($role) >> |
02a0fb52 |
711 | |
70bb0f97 |
712 | This takes a L<Moose::Meta::Role> object, and adds it to the class's |
713 | list of roles. This I<does not> actually apply the role to the class. |
2b14ac61 |
714 | |
b90dd4ef |
715 | =item B<< $metaclass->role_applications >> |
716 | |
639f9a1a |
717 | Returns a list of L<Moose::Meta::Role::Application::ToClass> |
b90dd4ef |
718 | objects, which contain the arguments to role application. |
719 | |
720 | =item B<< $metaclass->add_role_application($application) >> |
721 | |
722 | This takes a L<Moose::Meta::Role::Application::ToClass> object, and |
723 | adds it to the class's list of role applications. This I<does not> |
724 | actually apply any role to the class; it is only for tracking role |
725 | applications. |
726 | |
70bb0f97 |
727 | =item B<< $metaclass->does_role($role_name) >> |
ef333f17 |
728 | |
70bb0f97 |
729 | This returns a boolean indicating whether or not the class does the |
730 | specified role. This tests both the class and its parents. |
02a0fb52 |
731 | |
70bb0f97 |
732 | =item B<< $metaclass->excludes_role($role_name) >> |
ef333f17 |
733 | |
70bb0f97 |
734 | A class excludes a role if it has already composed a role which |
735 | excludes the named role. This tests both the class and its parents. |
02a0fb52 |
736 | |
70bb0f97 |
737 | =item B<< $metaclass->add_attribute($attr_name, %params|$params) >> |
ef333f17 |
738 | |
70bb0f97 |
739 | This overrides the parent's method in order to allow the parameters to |
740 | be provided as a hash reference. |
02a0fb52 |
741 | |
70bb0f97 |
742 | =item B<< $metaclass->constructor_class ($class_name) >> |
d79e62fd |
743 | |
70bb0f97 |
744 | =item B<< $metaclass->destructor_class ($class_name) >> |
e606ae5f |
745 | |
746 | These are the names of classes used when making a class |
747 | immutable. These default to L<Moose::Meta::Method::Constructor> and |
748 | L<Moose::Meta::Method::Destructor> respectively. These accessors are |
749 | read-write, so you can use them to change the class name. |
750 | |
70bb0f97 |
751 | =item B<< $metaclass->error_class($class_name) >> |
8b1d510f |
752 | |
70bb0f97 |
753 | The name of the class used to throw errors. This defaults to |
8b1d510f |
754 | L<Moose::Error::Default>, which generates an error with a stacktrace |
755 | just like C<Carp::confess>. |
756 | |
70bb0f97 |
757 | =item B<< $metaclass->throw_error($message, %extra) >> |
11c86f15 |
758 | |
759 | Throws the error created by C<create_error> using C<raise_error> |
760 | |
c0e30cf5 |
761 | =back |
762 | |
763 | =head1 BUGS |
764 | |
ac2dc464 |
765 | All complex software has bugs lurking in it, and this module is no |
c0e30cf5 |
766 | exception. If you find a bug please either email me, or add the bug |
767 | to cpan-RT. |
768 | |
c0e30cf5 |
769 | =head1 AUTHOR |
770 | |
771 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
772 | |
773 | =head1 COPYRIGHT AND LICENSE |
774 | |
2840a3b2 |
775 | Copyright 2006-2009 by Infinity Interactive, Inc. |
c0e30cf5 |
776 | |
777 | L<http://www.iinteractive.com> |
778 | |
779 | This library is free software; you can redistribute it and/or modify |
ac2dc464 |
780 | it under the same terms as Perl itself. |
c0e30cf5 |
781 | |
8a7a9c53 |
782 | =cut |
1a563243 |
783 | |