No parens on call to defined
[gitmo/Moose.git] / lib / Moose / Meta / Class.pm
CommitLineData
c0e30cf5 1
2package Moose::Meta::Class;
3
4use strict;
5use warnings;
6
0addec44 7use Class::MOP;
648e79ae 8
590e8894 9use Carp qw( confess );
2e7f6cf4 10use Data::OptList;
f8b6827f 11use List::Util qw( first );
349cda54 12use List::MoreUtils qw( any all uniq first_index );
21f1e231 13use Scalar::Util 'weaken', 'blessed';
a15dff8d 14
40290d18 15our $VERSION = '1.04';
e606ae5f 16$VERSION = eval $VERSION;
d44714be 17our $AUTHORITY = 'cpan:STEVAN';
bc1e29b5 18
74862722 19use Moose::Meta::Method::Overridden;
3f9e4b0a 20use Moose::Meta::Method::Augmented;
77f14411 21use Moose::Error::Default;
0fa70d03 22use Moose::Meta::Class::Immutable::Trait;
23use Moose::Meta::Method::Constructor;
24use Moose::Meta::Method::Destructor;
8ee73eeb 25
c0e30cf5 26use base 'Class::MOP::Class';
27
598340d5 28__PACKAGE__->meta->add_attribute('roles' => (
ef333f17 29 reader => 'roles',
30 default => sub { [] }
31));
32
a9b63d79 33__PACKAGE__->meta->add_attribute('role_applications' => (
639f9a1a 34 reader => '_get_role_applications',
a9b63d79 35 default => sub { [] }
36));
37
0fa70d03 38__PACKAGE__->meta->add_attribute(
39 Class::MOP::Attribute->new('immutable_trait' => (
40 accessor => "immutable_trait",
41 default => 'Moose::Meta::Class::Immutable::Trait',
42 ))
43);
44
e606ae5f 45__PACKAGE__->meta->add_attribute('constructor_class' => (
46 accessor => 'constructor_class',
e0001338 47 default => 'Moose::Meta::Method::Constructor',
e606ae5f 48));
49
50__PACKAGE__->meta->add_attribute('destructor_class' => (
51 accessor => 'destructor_class',
e0001338 52 default => 'Moose::Meta::Method::Destructor',
e606ae5f 53));
54
11c86f15 55__PACKAGE__->meta->add_attribute('error_class' => (
bf6fa6b3 56 accessor => 'error_class',
57 default => 'Moose::Error::Default',
11c86f15 58));
59
590868a3 60sub initialize {
61 my $class = shift;
62 my $pkg = shift;
d03bd989 63 return Class::MOP::get_metaclass_by_name($pkg)
685f7e44 64 || $class->SUPER::initialize($pkg,
65 'attribute_metaclass' => 'Moose::Meta::Attribute',
66 'method_metaclass' => 'Moose::Meta::Method',
67 'instance_metaclass' => 'Moose::Meta::Instance',
68 @_
d03bd989 69 );
ac2dc464 70}
590868a3 71
0fa70d03 72sub _immutable_options {
73 my ( $self, @args ) = @_;
74
75 $self->SUPER::_immutable_options(
76 inline_destructor => 1,
77
78 # Moose always does this when an attribute is created
79 inline_accessors => 0,
80
81 @args,
82 );
83}
84
61bdd94f 85sub create {
7d4035ae 86 my ($class, $package_name, %options) = @_;
d03bd989 87
61bdd94f 88 (ref $options{roles} eq 'ARRAY')
7d4035ae 89 || $class->throw_error("You must pass an ARRAY ref of roles", data => $options{roles})
61bdd94f 90 if exists $options{roles};
310ba883 91 my $roles = delete $options{roles};
dd37a5be 92
7d4035ae 93 my $new_meta = $class->SUPER::create($package_name, %options);
dd37a5be 94
310ba883 95 if ($roles) {
7d4035ae 96 Moose::Util::apply_all_roles( $new_meta, @$roles );
61bdd94f 97 }
d03bd989 98
7d4035ae 99 return $new_meta;
61bdd94f 100}
101
17594769 102my %ANON_CLASSES;
103
104sub create_anon_class {
105 my ($self, %options) = @_;
106
107 my $cache_ok = delete $options{cache};
d03bd989 108
cf600c83 109 my $cache_key
110 = _anon_cache_key( $options{superclasses}, $options{roles} );
d03bd989 111
6d5cbd2b 112 if ($cache_ok && defined $ANON_CLASSES{$cache_key}) {
17594769 113 return $ANON_CLASSES{$cache_key};
114 }
d03bd989 115
17594769 116 my $new_class = $self->SUPER::create_anon_class(%options);
117
6d5cbd2b 118 $ANON_CLASSES{$cache_key} = $new_class
119 if $cache_ok;
17594769 120
121 return $new_class;
122}
123
cf600c83 124sub _anon_cache_key {
125 # Makes something like Super::Class|Super::Class::2=Role|Role::1
126 return join '=' => (
127 join( '|', @{ $_[0] || [] } ),
128 join( '|', sort @{ $_[1] || [] } ),
129 );
130}
131
132sub reinitialize {
133 my $self = shift;
134 my $pkg = shift;
135
136 my $meta = blessed $pkg ? $pkg : Class::MOP::class_of($pkg);
137
138 my $cache_key;
139
140 my %existing_classes;
141 if ($meta) {
142 %existing_classes = map { $_ => $meta->$_() } qw(
143 attribute_metaclass
144 method_metaclass
145 wrapped_method_metaclass
146 instance_metaclass
147 constructor_class
148 destructor_class
149 error_class
150 );
151
152 $cache_key = _anon_cache_key(
153 [ $meta->superclasses ],
154 [ map { $_->name } @{ $meta->roles } ],
155 ) if $meta->is_anon_class;
156 }
157
158 my $new_meta = $self->SUPER::reinitialize(
159 $pkg,
160 %existing_classes,
161 @_,
162 );
163
164 return $new_meta unless defined $cache_key;
165
166 my $new_cache_key = _anon_cache_key(
167 [ $meta->superclasses ],
168 [ map { $_->name } @{ $meta->roles } ],
169 );
170
171 delete $ANON_CLASSES{$cache_key};
172 $ANON_CLASSES{$new_cache_key} = $new_meta;
173
174 return $new_meta;
175}
176
ef333f17 177sub add_role {
178 my ($self, $role) = @_;
179 (blessed($role) && $role->isa('Moose::Meta::Role'))
11c86f15 180 || $self->throw_error("Roles must be instances of Moose::Meta::Role", data => $role);
ef333f17 181 push @{$self->roles} => $role;
182}
183
639f9a1a 184sub role_applications {
185 my ($self) = @_;
186
187 return @{$self->_get_role_applications};
188}
189
a9b63d79 190sub add_role_application {
191 my ($self, $application) = @_;
192 (blessed($application) && $application->isa('Moose::Meta::Role::Application::ToClass'))
193 || $self->throw_error("Role applications must be instances of Moose::Meta::Role::Application::ToClass", data => $application);
639f9a1a 194 push @{$self->_get_role_applications} => $application;
a9b63d79 195}
196
b8aeb4dc 197sub calculate_all_roles {
198 my $self = shift;
199 my %seen;
200 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
201}
202
9f83eb5d 203sub calculate_all_roles_with_inheritance {
204 my $self = shift;
205 my %seen;
206 grep { !$seen{$_->name}++ }
207 map { Class::MOP::class_of($_)->can('calculate_all_roles')
208 ? Class::MOP::class_of($_)->calculate_all_roles
209 : () }
210 $self->linearized_isa;
211}
212
ef333f17 213sub does_role {
214 my ($self, $role_name) = @_;
322abb07 215
ef333f17 216 (defined $role_name)
11c86f15 217 || $self->throw_error("You must supply a role name to look for");
322abb07 218
9c429218 219 foreach my $class ($self->class_precedence_list) {
322abb07 220 my $meta = Class::MOP::class_of($class);
3d0f5a27 221 # when a Moose metaclass is itself extended with a role,
222 # this check needs to be done since some items in the
223 # class_precedence_list might in fact be Class::MOP
224 # based still.
322abb07 225 next unless $meta && $meta->can('roles');
226 foreach my $role (@{$meta->roles}) {
9c429218 227 return 1 if $role->does_role($role_name);
228 }
ef333f17 229 }
230 return 0;
231}
232
d79e62fd 233sub excludes_role {
234 my ($self, $role_name) = @_;
ebfc4d0f 235
d79e62fd 236 (defined $role_name)
11c86f15 237 || $self->throw_error("You must supply a role name to look for");
ebfc4d0f 238
ac2dc464 239 foreach my $class ($self->class_precedence_list) {
ebfc4d0f 240 my $meta = Class::MOP::class_of($class);
241 # when a Moose metaclass is itself extended with a role,
242 # this check needs to be done since some items in the
243 # class_precedence_list might in fact be Class::MOP
244 # based still.
245 next unless $meta && $meta->can('roles');
246 foreach my $role (@{$meta->roles}) {
9c429218 247 return 1 if $role->excludes_role($role_name);
248 }
d79e62fd 249 }
250 return 0;
251}
252
8c9d74e7 253sub new_object {
7d4035ae 254 my $self = shift;
e606ae5f 255 my $params = @_ == 1 ? $_[0] : {@_};
7d4035ae 256 my $object = $self->SUPER::new_object($params);
1308deb4 257
7d4035ae 258 foreach my $attr ( $self->get_all_attributes() ) {
1308deb4 259
260 next unless $attr->can('has_trigger') && $attr->has_trigger;
261
262 my $init_arg = $attr->init_arg;
263
264 next unless defined $init_arg;
265
266 next unless exists $params->{$init_arg};
267
268 $attr->trigger->(
7d4035ae 269 $object,
1308deb4 270 (
271 $attr->should_coerce
7d4035ae 272 ? $attr->get_read_method_ref->($object)
1308deb4 273 : $params->{$init_arg}
274 ),
1308deb4 275 );
8c9d74e7 276 }
1308deb4 277
7d4035ae 278 $object->BUILDALL($params) if $object->can('BUILDALL');
a19ae3d7 279
7d4035ae 280 return $object;
8c9d74e7 281}
282
e2eef3a5 283sub superclasses {
284 my $self = shift;
2e7f6cf4 285 my $supers = Data::OptList::mkopt(\@_);
286 foreach my $super (@{ $supers }) {
287 my ($name, $opts) = @{ $super };
288 Class::MOP::load_class($name, $opts);
289 my $meta = Class::MOP::class_of($name);
290 $self->throw_error("You cannot inherit from a Moose Role ($name)")
e2eef3a5 291 if $meta && $meta->isa('Moose::Meta::Role')
292 }
2e7f6cf4 293 return $self->SUPER::superclasses(map { $_->[0] } @{ $supers });
e2eef3a5 294}
295
093b12c2 296### ---------------------------------------------
297
a2eec5e7 298sub add_attribute {
299 my $self = shift;
28af3424 300 my $attr =
e472c9a5 301 (blessed $_[0] && $_[0]->isa('Class::MOP::Attribute')
d03bd989 302 ? $_[0]
28af3424 303 : $self->_process_attribute(@_));
304 $self->SUPER::add_attribute($attr);
305 # it may be a Class::MOP::Attribute, theoretically, which doesn't have
306 # 'bare' and doesn't implement this method
9340e346 307 if ($attr->can('_check_associated_methods')) {
308 $attr->_check_associated_methods;
28af3424 309 }
310 return $attr;
a2eec5e7 311}
312
78cd1d3b 313sub add_override_method_modifier {
314 my ($self, $name, $method, $_super_package) = @_;
18c2ec0e 315
d05cd563 316 (!$self->has_method($name))
11c86f15 317 || $self->throw_error("Cannot add an override method if a local method is already present");
18c2ec0e 318
74862722 319 $self->add_method($name => Moose::Meta::Method::Overridden->new(
3f9e4b0a 320 method => $method,
321 class => $self,
322 package => $_super_package, # need this for roles
323 name => $name,
18c2ec0e 324 ));
78cd1d3b 325}
326
327sub add_augment_method_modifier {
ac2dc464 328 my ($self, $name, $method) = @_;
d05cd563 329 (!$self->has_method($name))
11c86f15 330 || $self->throw_error("Cannot add an augment method if a local method is already present");
3f9e4b0a 331
332 $self->add_method($name => Moose::Meta::Method::Augmented->new(
333 method => $method,
334 class => $self,
335 name => $name,
336 ));
78cd1d3b 337}
338
1341f10c 339## Private Utility methods ...
340
05d9eaf6 341sub _find_next_method_by_name_which_is_not_overridden {
342 my ($self, $name) = @_;
68efb014 343 foreach my $method ($self->find_all_methods_by_name($name)) {
ac2dc464 344 return $method->{code}
74862722 345 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overridden');
05d9eaf6 346 }
347 return undef;
348}
349
f6df97ae 350## Metaclass compatibility
f8b6827f 351
f6df97ae 352sub _base_metaclasses {
353 my $self = shift;
354 my %metaclasses = $self->SUPER::_base_metaclasses;
355 for my $class (keys %metaclasses) {
356 $metaclasses{$class} =~ s/^Class::MOP/Moose::Meta/;
1341f10c 357 }
f6df97ae 358 return (
359 %metaclasses,
360 error_class => 'Moose::Error::Default',
f8b6827f 361 );
f8b6827f 362}
363
f6df97ae 364sub _find_common_base {
365 my $self = shift;
366 my ($meta1, $meta2) = map { Class::MOP::class_of($_) } @_;
0b91067b 367 return unless defined $meta1 && defined $meta2;
f8b6827f 368
369 # FIXME? This doesn't account for multiple inheritance (not sure
79ca665e 370 # if it needs to though). For example, if somewhere in $meta1's
db9fda52 371 # history it inherits from both ClassA and ClassB, and $meta2
f8b6827f 372 # inherits from ClassB & ClassA, does it matter? And what crazy
373 # fool would do that anyway?
374
375 my %meta1_parents = map { $_ => 1 } $meta1->linearized_isa;
376
377 return first { $meta1_parents{$_} } $meta2->linearized_isa;
378}
379
f6df97ae 380sub _get_ancestors_until {
381 my $self = shift;
dd3ac8f9 382 my ($start_name, $until_name) = @_;
f8b6827f 383
dd3ac8f9 384 my @ancestor_names;
385 for my $ancestor_name (Class::MOP::class_of($start_name)->linearized_isa) {
386 last if $ancestor_name eq $until_name;
387 push @ancestor_names, $ancestor_name;
f6df97ae 388 }
dd3ac8f9 389 return @ancestor_names;
f6df97ae 390}
f8b6827f 391
f6df97ae 392sub _is_role_only_subclass {
393 my $self = shift;
dd3ac8f9 394 my ($meta_name) = @_;
395 my $meta = Class::MOP::Class->initialize($meta_name);
396 my @parent_names = $meta->superclasses;
f6df97ae 397
398 # XXX: don't feel like messing with multiple inheritance here... what would
399 # that even do?
dd3ac8f9 400 return unless @parent_names == 1;
401 my ($parent_name) = @parent_names;
402 my $parent_meta = Class::MOP::Class->initialize($parent_name);
f6df97ae 403
404 # loop over all methods that are a part of the current class
405 # (not inherited)
dd3ac8f9 406 for my $method (map { $meta->get_method($_) } $meta->get_method_list) {
f6df97ae 407 # always ignore meta
f8b6827f 408 next if $method->name eq 'meta';
f6df97ae 409 # we'll deal with attributes below
410 next if $method->isa('Class::MOP::Method::Accessor');
411 # if the method comes from a role we consumed, ignore it
dd3ac8f9 412 next if $meta->can('does_role')
413 && $meta->does_role($method->original_package_name);
f8b6827f 414
415 return 0;
416 }
417
f6df97ae 418 # loop over all attributes that are a part of the current class
419 # (not inherited)
f8b6827f 420 # FIXME - this really isn't right. Just because an attribute is
421 # defined in a role doesn't mean it isn't _also_ defined in the
422 # subclass.
dd3ac8f9 423 for my $attr (map { $meta->get_attribute($_) } $meta->get_attribute_list) {
f6df97ae 424 next if any { $_->has_attribute($attr->name) }
9f83eb5d 425 $meta->calculate_all_roles_with_inheritance;
f8b6827f 426
427 return 0;
428 }
429
430 return 1;
431}
432
f6df97ae 433sub _can_fix_class_metaclass_incompatibility_by_role_reconciliation {
434 my $self = shift;
435 my ($super_meta) = @_;
436
a907317a 437 my $super_meta_name = $super_meta->_real_ref_name;
9f83eb5d 438 my $common_base_name = $self->_find_common_base(blessed($self), $super_meta_name);
f6df97ae 439 # if they're not both moose metaclasses, and the cmop fixing couldn't
440 # do anything, there's nothing more we can do
0b91067b 441 return unless defined $common_base_name;
dd3ac8f9 442 return unless $common_base_name->isa('Moose::Meta::Class');
f8b6827f 443
9f83eb5d 444 my @super_meta_name_ancestor_names = $self->_get_ancestors_until($super_meta_name, $common_base_name);
dd3ac8f9 445 my @class_meta_name_ancestor_names = $self->_get_ancestors_until(blessed($self), $common_base_name);
f6df97ae 446 # we're only dealing with roles here
447 return unless all { $self->_is_role_only_subclass($_) }
dd3ac8f9 448 (@super_meta_name_ancestor_names,
449 @class_meta_name_ancestor_names);
f6df97ae 450
451 return 1;
f8b6827f 452}
453
f6df97ae 454sub _can_fix_single_metaclass_incompatibility_by_role_reconciliation {
455 my $self = shift;
dd3ac8f9 456 my ($metaclass_type, $super_meta) = @_;
f8b6827f 457
dd3ac8f9 458 my $class_specific_meta_name = $self->$metaclass_type;
459 return unless $super_meta->can($metaclass_type);
460 my $super_specific_meta_name = $super_meta->$metaclass_type;
f6df97ae 461 my %metaclasses = $self->_base_metaclasses;
f8b6827f 462
dd3ac8f9 463 my $common_base_name = $self->_find_common_base($class_specific_meta_name, $super_specific_meta_name);
f6df97ae 464 # if they're not both moose metaclasses, and the cmop fixing couldn't
465 # do anything, there's nothing more we can do
0b91067b 466 return unless defined $common_base_name;
dd3ac8f9 467 return unless $common_base_name->isa($metaclasses{$metaclass_type});
f8b6827f 468
dd3ac8f9 469 my @super_specific_meta_name_ancestor_names = $self->_get_ancestors_until($super_specific_meta_name, $common_base_name);
470 my @class_specific_meta_name_ancestor_names = $self->_get_ancestors_until($class_specific_meta_name, $common_base_name);
f6df97ae 471 # we're only dealing with roles here
472 return unless all { $self->_is_role_only_subclass($_) }
dd3ac8f9 473 (@super_specific_meta_name_ancestor_names,
474 @class_specific_meta_name_ancestor_names);
f8b6827f 475
f6df97ae 476 return 1;
477}
f8b6827f 478
f6df97ae 479sub _role_differences {
480 my $self = shift;
dd3ac8f9 481 my ($class_meta_name, $super_meta_name) = @_;
9f83eb5d 482 my @super_role_metas = $super_meta_name->meta->can('calculate_all_roles_with_inheritance')
483 ? $super_meta_name->meta->calculate_all_roles_with_inheritance
dd3ac8f9 484 : ();
9f83eb5d 485 my @role_metas = $class_meta_name->meta->can('calculate_all_roles_with_inheritance')
486 ? $class_meta_name->meta->calculate_all_roles_with_inheritance
dd3ac8f9 487 : ();
f6df97ae 488 my @differences;
dd3ac8f9 489 for my $role_meta (@role_metas) {
490 push @differences, $role_meta
491 unless any { $_->name eq $role_meta->name } @super_role_metas;
f8b6827f 492 }
f6df97ae 493 return @differences;
f8b6827f 494}
495
f6df97ae 496sub _reconcile_roles_for_metaclass {
497 my $self = shift;
dd3ac8f9 498 my ($class_meta_name, $super_meta_name) = @_;
f8b6827f 499
dd3ac8f9 500 my @role_differences = $self->_role_differences(
501 $class_meta_name, $super_meta_name,
502 );
9f83eb5d 503 return Moose::Meta::Class->create_anon_class(
dd3ac8f9 504 superclasses => [$super_meta_name],
f6df97ae 505 roles => \@role_differences,
506 cache => 1,
507 );
508}
509
510sub _can_fix_metaclass_incompatibility_by_role_reconciliation {
511 my $self = shift;
512 my ($super_meta) = @_;
f8b6827f 513
f6df97ae 514 return 1 if $self->_can_fix_class_metaclass_incompatibility_by_role_reconciliation($super_meta);
f8b6827f 515
f6df97ae 516 my %base_metaclass = $self->_base_metaclasses;
517 for my $metaclass_type (keys %base_metaclass) {
518 next unless defined $self->$metaclass_type;
519 return 1 if $self->_can_fix_single_metaclass_incompatibility_by_role_reconciliation($metaclass_type, $super_meta);
f8b6827f 520 }
521
f6df97ae 522 return;
523}
f8b6827f 524
f6df97ae 525sub _can_fix_metaclass_incompatibility {
526 my $self = shift;
527 return 1 if $self->_can_fix_metaclass_incompatibility_by_role_reconciliation(@_);
528 return $self->SUPER::_can_fix_metaclass_incompatibility(@_);
529}
530
531sub _fix_class_metaclass_incompatibility {
532 my $self = shift;
533 my ($super_meta) = @_;
f8b6827f 534
f6df97ae 535 $self->SUPER::_fix_class_metaclass_incompatibility(@_);
f8b6827f 536
f6df97ae 537 if ($self->_can_fix_class_metaclass_incompatibility_by_role_reconciliation($super_meta)) {
590e8894 538 ($self->is_pristine)
539 || confess "Can't fix metaclass incompatibility for "
540 . $self->name
541 . " because it is not pristine.";
a907317a 542 my $super_meta_name = $super_meta->_real_ref_name;
9f83eb5d 543 my $class_meta_subclass_meta = $self->_reconcile_roles_for_metaclass(blessed($self), $super_meta_name);
cf7febc7 544 my $new_self = $class_meta_subclass_meta->name->reinitialize(
545 $self->name,
546 );
6a52b083 547
548 $self->_replace_self( $new_self, $class_meta_subclass_meta->name );
f8b6827f 549 }
f6df97ae 550}
f8b6827f 551
f6df97ae 552sub _fix_single_metaclass_incompatibility {
553 my $self = shift;
554 my ($metaclass_type, $super_meta) = @_;
f8b6827f 555
f6df97ae 556 $self->SUPER::_fix_single_metaclass_incompatibility(@_);
f8b6827f 557
f6df97ae 558 if ($self->_can_fix_single_metaclass_incompatibility_by_role_reconciliation($metaclass_type, $super_meta)) {
590e8894 559 ($self->is_pristine)
560 || confess "Can't fix metaclass incompatibility for "
561 . $self->name
562 . " because it is not pristine.";
dd3ac8f9 563 my $class_specific_meta_subclass_meta = $self->_reconcile_roles_for_metaclass($self->$metaclass_type, $super_meta->$metaclass_type);
cf7febc7 564 my $new_self = $super_meta->reinitialize(
565 $self->name,
566 $metaclass_type => $class_specific_meta_subclass_meta->name,
567 );
6a52b083 568
569 $self->_replace_self( $new_self, blessed($super_meta) );
f6df97ae 570 }
f8b6827f 571}
572
6a52b083 573
574sub _replace_self {
575 my $self = shift;
576 my ( $new_self, $new_class) = @_;
577
578 %$self = %$new_self;
579 bless $self, $new_class;
580
581 # We need to replace the cached metaclass instance or else when it goes
582 # out of scope Class::MOP::Class destroy's the namespace for the
583 # metaclass's class, causing much havoc.
584 Class::MOP::store_metaclass_by_name( $self->name, $self );
585 Class::MOP::weaken_metaclass( $self->name ) if $self->is_anon_class;
586}
587
1341f10c 588sub _process_attribute {
a3738e5b 589 my ( $self, $name, @args ) = @_;
7e59b803 590
591 @args = %{$args[0]} if scalar @args == 1 && ref($args[0]) eq 'HASH';
d9bb6c63 592
f9b5f5f8 593 if (($name || '') =~ /^\+(.*)/) {
7e59b803 594 return $self->_process_inherited_attribute($1, @args);
1341f10c 595 }
596 else {
7e59b803 597 return $self->_process_new_attribute($name, @args);
598 }
599}
600
601sub _process_new_attribute {
602 my ( $self, $name, @args ) = @_;
7e59b803 603
d5c30e52 604 $self->attribute_metaclass->interpolate_class_and_new($name, @args);
1341f10c 605}
606
607sub _process_inherited_attribute {
608 my ($self, $attr_name, %options) = @_;
609 my $inherited_attr = $self->find_attribute_by_name($attr_name);
610 (defined $inherited_attr)
329c5dd4 611 || $self->throw_error("Could not find an attribute by the name of '$attr_name' to inherit from in ${\$self->name}", data => $attr_name);
1341f10c 612 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
d7d8a8c7 613 return $inherited_attr->clone_and_inherit_options(%options);
1341f10c 614 }
615 else {
616 # NOTE:
617 # kind of a kludge to handle Class::MOP::Attributes
d7d8a8c7 618 return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options);
ac2dc464 619 }
1341f10c 620}
621
5cf3dbcf 622## -------------------------------------------------
623
bf6fa6b3 624our $error_level;
11c86f15 625
626sub throw_error {
627 my ( $self, @args ) = @_;
bf6fa6b3 628 local $error_level = ($error_level || 0) + 1;
11c86f15 629 $self->raise_error($self->create_error(@args));
630}
631
632sub raise_error {
633 my ( $self, @args ) = @_;
634 die @args;
635}
636
637sub create_error {
638 my ( $self, @args ) = @_;
639
18748ad6 640 require Carp::Heavy;
641
bf6fa6b3 642 local $error_level = ($error_level || 0 ) + 1;
18748ad6 643
11c86f15 644 if ( @args % 2 == 1 ) {
645 unshift @args, "message";
646 }
647
fcab1742 648 my %args = ( metaclass => $self, last_error => $@, @args );
11c86f15 649
bf6fa6b3 650 $args{depth} += $error_level;
11c86f15 651
bf6fa6b3 652 my $class = ref $self ? $self->error_class : "Moose::Error::Default";
11c86f15 653
a810a01f 654 Class::MOP::load_class($class);
655
11c86f15 656 $class->new(
bf6fa6b3 657 Carp::caller_info($args{depth}),
658 %args
11c86f15 659 );
660}
661
c0e30cf5 6621;
663
664__END__
665
666=pod
667
668=head1 NAME
669
e522431d 670Moose::Meta::Class - The Moose metaclass
c0e30cf5 671
c0e30cf5 672=head1 DESCRIPTION
673
70bb0f97 674This class is a subclass of L<Class::MOP::Class> that provides
675additional Moose-specific functionality.
e522431d 676
7854b409 677To really understand this class, you will need to start with the
678L<Class::MOP::Class> documentation. This class can be understood as a
679set of additional features on top of the basic feature provided by
680that parent class.
6ba6d68c 681
d4b1449e 682=head1 INHERITANCE
683
684C<Moose::Meta::Class> is a subclass of L<Class::MOP::Class>.
685
c0e30cf5 686=head1 METHODS
687
688=over 4
689
70bb0f97 690=item B<< Moose::Meta::Class->initialize($package_name, %options) >>
590868a3 691
70bb0f97 692This overrides the parent's method in order to provide its own
693defaults for the C<attribute_metaclass>, C<instance_metaclass>, and
694C<method_metaclass> options.
61bdd94f 695
70bb0f97 696These all default to the appropriate Moose class.
61bdd94f 697
70bb0f97 698=item B<< Moose::Meta::Class->create($package_name, %options) >>
17594769 699
70bb0f97 700This overrides the parent's method in order to accept a C<roles>
9e25a72a 701option. This should be an array reference containing roles
702that the class does, each optionally followed by a hashref of options
703(C<-excludes> and C<-alias>).
17594769 704
70bb0f97 705 my $metaclass = Moose::Meta::Class->create( 'New::Class', roles => [...] );
17594769 706
70bb0f97 707=item B<< Moose::Meta::Class->create_anon_class >>
17594769 708
70bb0f97 709This overrides the parent's method to accept a C<roles> option, just
710as C<create> does.
5cf3dbcf 711
70bb0f97 712It also accepts a C<cache> option. If this is true, then the anonymous
713class will be cached based on its superclasses and roles. If an
714existing anonymous class in the cache has the same superclasses and
715roles, it will be reused.
ac2dc464 716
70bb0f97 717 my $metaclass = Moose::Meta::Class->create_anon_class(
718 superclasses => ['Foo'],
719 roles => [qw/Some Roles Go Here/],
720 cache => 1,
721 );
ac2dc464 722
2e7f6cf4 723Each entry in both the C<superclasses> and the C<roles> option can be
b2d54db8 724followed by a hash reference with arguments. The C<superclasses>
2e7f6cf4 725option can be supplied with a L<-version|Class::MOP/Class Loading
726Options> option that ensures the loaded superclass satisfies the
727required version. The C<role> option also takes the C<-version> as an
728argument, but the option hash reference can also contain any other
729role relevant values like exclusions or parameterized role arguments.
730
70bb0f97 731=item B<< $metaclass->make_immutable(%options) >>
ac2dc464 732
70bb0f97 733This overrides the parent's method to add a few options. Specifically,
734it uses the Moose-specific constructor and destructor classes, and
735enables inlining the destructor.
8c9d74e7 736
70bb0f97 737Also, since Moose always inlines attributes, it sets the
738C<inline_accessors> option to false.
02a0fb52 739
70bb0f97 740=item B<< $metaclass->new_object(%params) >>
a15dff8d 741
70bb0f97 742This overrides the parent's method in order to add support for
743attribute triggers.
6ba6d68c 744
2e7f6cf4 745=item B<< $metaclass->superclasses(@superclasses) >>
746
6b958a3e 747This is the accessor allowing you to read or change the parents of
2e7f6cf4 748the class.
749
750Each superclass can be followed by a hash reference containing a
751L<-version|Class::MOP/Class Loading Options> value. If the version
752requirement is not satisfied an error will be thrown.
753
70bb0f97 754=item B<< $metaclass->add_override_method_modifier($name, $sub) >>
ef1d5f4b 755
70bb0f97 756This adds an C<override> method modifier to the package.
e9ec68d6 757
70bb0f97 758=item B<< $metaclass->add_augment_method_modifier($name, $sub) >>
e9ec68d6 759
70bb0f97 760This adds an C<augment> method modifier to the package.
78cd1d3b 761
70bb0f97 762=item B<< $metaclass->calculate_all_roles >>
02a0fb52 763
70bb0f97 764This will return a unique array of C<Moose::Meta::Role> instances
765which are attached to this class.
78cd1d3b 766
9f83eb5d 767=item B<< $metaclass->calculate_all_roles_with_inheritance >>
768
769This will return a unique array of C<Moose::Meta::Role> instances
770which are attached to this class, and each of this class's ancestors.
771
70bb0f97 772=item B<< $metaclass->add_role($role) >>
02a0fb52 773
70bb0f97 774This takes a L<Moose::Meta::Role> object, and adds it to the class's
775list of roles. This I<does not> actually apply the role to the class.
2b14ac61 776
b90dd4ef 777=item B<< $metaclass->role_applications >>
778
639f9a1a 779Returns a list of L<Moose::Meta::Role::Application::ToClass>
b90dd4ef 780objects, which contain the arguments to role application.
781
782=item B<< $metaclass->add_role_application($application) >>
783
784This takes a L<Moose::Meta::Role::Application::ToClass> object, and
785adds it to the class's list of role applications. This I<does not>
786actually apply any role to the class; it is only for tracking role
787applications.
788
560c498d 789=item B<< $metaclass->does_role($role) >>
ef333f17 790
560c498d 791This returns a boolean indicating whether or not the class does the specified
792role. The role provided can be either a role name or a L<Moose::Meta::Role>
793object. This tests both the class and its parents.
02a0fb52 794
70bb0f97 795=item B<< $metaclass->excludes_role($role_name) >>
ef333f17 796
70bb0f97 797A class excludes a role if it has already composed a role which
798excludes the named role. This tests both the class and its parents.
02a0fb52 799
70bb0f97 800=item B<< $metaclass->add_attribute($attr_name, %params|$params) >>
ef333f17 801
70bb0f97 802This overrides the parent's method in order to allow the parameters to
803be provided as a hash reference.
02a0fb52 804
9f9fdd08 805=item B<< $metaclass->constructor_class($class_name) >>
d79e62fd 806
9f9fdd08 807=item B<< $metaclass->destructor_class($class_name) >>
e606ae5f 808
809These are the names of classes used when making a class
810immutable. These default to L<Moose::Meta::Method::Constructor> and
811L<Moose::Meta::Method::Destructor> respectively. These accessors are
812read-write, so you can use them to change the class name.
813
70bb0f97 814=item B<< $metaclass->error_class($class_name) >>
8b1d510f 815
70bb0f97 816The name of the class used to throw errors. This defaults to
8b1d510f 817L<Moose::Error::Default>, which generates an error with a stacktrace
818just like C<Carp::confess>.
819
70bb0f97 820=item B<< $metaclass->throw_error($message, %extra) >>
11c86f15 821
822Throws the error created by C<create_error> using C<raise_error>
823
c0e30cf5 824=back
825
826=head1 BUGS
827
d4048ef3 828See L<Moose/BUGS> for details on reporting bugs.
c0e30cf5 829
c0e30cf5 830=head1 AUTHOR
831
832Stevan Little E<lt>stevan@iinteractive.comE<gt>
833
834=head1 COPYRIGHT AND LICENSE
835
7e0492d3 836Copyright 2006-2010 by Infinity Interactive, Inc.
c0e30cf5 837
838L<http://www.iinteractive.com>
839
840This library is free software; you can redistribute it and/or modify
ac2dc464 841it under the same terms as Perl itself.
c0e30cf5 842
8a7a9c53 843=cut
1a563243 844