2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.21';
13 our $AUTHORITY = 'cpan:STEVAN';
15 use Moose::Meta::Method::Overriden;
17 use base 'Class::MOP::Class';
19 __PACKAGE__->meta->add_attribute('roles' => (
27 $class->SUPER::initialize($pkg,
28 'attribute_metaclass' => 'Moose::Meta::Attribute',
29 'method_metaclass' => 'Moose::Meta::Method',
30 'instance_metaclass' => 'Moose::Meta::Instance',
35 my ($self, $package_name, %options) = @_;
37 (ref $options{roles} eq 'ARRAY')
38 || confess "You must pass an ARRAY ref of roles"
39 if exists $options{roles};
41 my $class = $self->SUPER::create($package_name, %options);
43 if (exists $options{roles}) {
44 Moose::Util::apply_all_roles($class, @{$options{roles}});
52 sub create_anon_class {
53 my ($self, %options) = @_;
55 my $cache_ok = delete $options{cache};
57 # something like Super::Class|Super::Class::2=Role|Role::1
58 my $cache_key = join '=' => (
59 join('|', sort @{$options{superclasses} || []}),
60 join('|', sort @{$options{roles} || []}),
63 if ($cache_ok && defined $ANON_CLASSES{$cache_key}) {
64 return $ANON_CLASSES{$cache_key};
67 my $new_class = $self->SUPER::create_anon_class(%options);
69 $ANON_CLASSES{$cache_key} = $new_class
76 my ($self, $role) = @_;
77 (blessed($role) && $role->isa('Moose::Meta::Role'))
78 || confess "Roles must be instances of Moose::Meta::Role";
79 push @{$self->roles} => $role;
82 sub calculate_all_roles {
85 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
89 my ($self, $role_name) = @_;
91 || confess "You must supply a role name to look for";
92 foreach my $class ($self->class_precedence_list) {
93 next unless $class->can('meta') && $class->meta->can('roles');
94 foreach my $role (@{$class->meta->roles}) {
95 return 1 if $role->does_role($role_name);
102 my ($self, $role_name) = @_;
104 || confess "You must supply a role name to look for";
105 foreach my $class ($self->class_precedence_list) {
106 next unless $class->can('meta');
108 # in the pretty rare instance when a Moose metaclass
109 # is itself extended with a role, this check needs to
110 # be done since some items in the class_precedence_list
111 # might in fact be Class::MOP based still.
112 next unless $class->meta->can('roles');
113 foreach my $role (@{$class->meta->roles}) {
114 return 1 if $role->excludes_role($role_name);
121 my ($class, %params) = @_;
122 my $self = $class->SUPER::new_object(%params);
123 foreach my $attr ($class->compute_all_applicable_attributes()) {
124 # if we have a trigger, then ...
125 if ($attr->can('has_trigger') && $attr->has_trigger) {
126 # make sure we have an init-arg ...
127 if (defined(my $init_arg = $attr->init_arg)) {
128 # now make sure an init-arg was passes ...
129 if (exists $params{$init_arg}) {
130 # and if get here, fire the trigger
133 # check if there is a coercion
134 ($attr->should_coerce
135 # and if so, we need to grab the
136 # value that is actually been stored
137 ? $attr->get_read_method_ref->($self)
138 # otherwise, just get the value from
139 # the constructor params
140 : $params{$init_arg}),
150 sub construct_instance {
151 my ($class, %params) = @_;
152 my $meta_instance = $class->get_meta_instance;
154 # the code below is almost certainly incorrect
155 # but this is foreign inheritence, so we might
156 # have to kludge it in the end.
157 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
158 foreach my $attr ($class->compute_all_applicable_attributes()) {
159 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
169 if (defined $self->{'$!_package_cache_flag'} &&
170 $self->{'$!_package_cache_flag'} == Class::MOP::check_package_cache_flag($self->meta->name)) {
171 return $self->{'%!methods'};
174 my $map = $self->{'%!methods'};
176 my $class_name = $self->name;
177 my $method_metaclass = $self->method_metaclass;
179 foreach my $symbol ($self->list_all_package_symbols('CODE')) {
181 my $code = $self->get_package_symbol('&' . $symbol);
183 next if exists $map->{$symbol} &&
184 defined $map->{$symbol} &&
185 $map->{$symbol}->body == $code;
187 my ($pkg, $name) = Class::MOP::get_code_info($code);
189 if ($pkg->can('meta')
191 # we don't know what ->meta we are calling
192 # here, so we need to be careful cause it
193 # just might blow up at us, or just complain
194 # loudly (in the case of Curses.pm) so we
195 # just be a little overly cautious here.
197 && eval { no warnings; blessed($pkg->meta) }
198 && $pkg->meta->isa('Moose::Meta::Role')) {
199 #my $role = $pkg->meta->name;
200 #next unless $self->does_role($role);
203 next if ($pkg || '') ne $class_name &&
204 ($name || '') ne '__ANON__';
208 $map->{$symbol} = $method_metaclass->wrap($code);
214 ### ---------------------------------------------
218 $self->SUPER::add_attribute(
219 (blessed $_[0] && $_[0]->isa('Class::MOP::Attribute')
221 : $self->_process_attribute(@_))
225 sub add_override_method_modifier {
226 my ($self, $name, $method, $_super_package) = @_;
228 (!$self->has_method($name))
229 || confess "Cannot add an override method if a local method is already present";
231 $self->add_method($name => Moose::Meta::Method::Overriden->new(
234 package => $_super_package, # need this for roles
239 sub add_augment_method_modifier {
240 my ($self, $name, $method) = @_;
241 (!$self->has_method($name))
242 || confess "Cannot add an augment method if a local method is already present";
243 my $super = $self->find_next_method_by_name($name);
245 || confess "You cannot augment '$name' because it has no super method";
246 my $_super_package = $super->package_name;
247 # BUT!,... if this is an overriden method ....
248 if ($super->isa('Moose::Meta::Method::Overriden')) {
249 # we need to be sure that we actually
250 # find the next method, which is not
251 # an 'override' method, the reason is
252 # that an 'override' method will not
253 # be the one calling inner()
254 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
255 $_super_package = $real_super->package_name;
257 $self->add_method($name => sub {
259 no warnings 'redefine';
260 if ($Moose::INNER_SLOT{$_super_package}) {
261 local *{$Moose::INNER_SLOT{$_super_package}} = sub {
262 local *{$Moose::INNER_SLOT{$_super_package}} = sub {};
265 return $super->body->(@args);
268 return $super->body->(@args);
273 ## Private Utility methods ...
275 sub _find_next_method_by_name_which_is_not_overridden {
276 my ($self, $name) = @_;
277 foreach my $method ($self->find_all_methods_by_name($name)) {
278 return $method->{code}
279 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
284 sub _fix_metaclass_incompatability {
285 my ($self, @superclasses) = @_;
286 foreach my $super (@superclasses) {
287 # don't bother if it does not have a meta.
288 next unless $super->can('meta');
289 # get the name, make sure we take
290 # immutable classes into account
291 my $super_meta_name = ($super->meta->is_immutable
292 ? $super->meta->get_mutable_metaclass_name
293 : blessed($super->meta));
294 # if it's meta is a vanilla Moose,
295 # then we can safely ignore it.
296 next if $super_meta_name eq 'Moose::Meta::Class';
297 # but if we have anything else,
298 # we need to check it out ...
299 unless (# see if of our metaclass is incompatible
300 ($self->isa($super_meta_name) &&
301 # and see if our instance metaclass is incompatible
302 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
303 # ... and if we are just a vanilla Moose
304 $self->isa('Moose::Meta::Class')) {
305 # re-initialize the meta ...
306 my $super_meta = $super->meta;
308 # We might want to consider actually
309 # transfering any attributes from the
310 # original meta into this one, but in
311 # general you should not have any there
312 # at this point anyway, so it's very
313 # much an obscure edge case anyway
314 $self = $super_meta->reinitialize($self->name => (
315 'attribute_metaclass' => $super_meta->attribute_metaclass,
316 'method_metaclass' => $super_meta->method_metaclass,
317 'instance_metaclass' => $super_meta->instance_metaclass,
325 # this was crap anyway, see
326 # Moose::Util::apply_all_roles
328 sub _apply_all_roles {
329 Carp::croak 'DEPRECATED: use Moose::Util::apply_all_roles($meta, @roles) instead'
332 sub _process_attribute {
335 my %options = ((scalar @_ == 1 && ref($_[0]) eq 'HASH') ? %{$_[0]} : @_);
337 if ($name =~ /^\+(.*)/) {
338 return $self->_process_inherited_attribute($1, %options);
341 my $attr_metaclass_name;
342 if ($options{metaclass}) {
343 my $metaclass_name = $options{metaclass};
345 my $possible_full_name = 'Moose::Meta::Attribute::Custom::' . $metaclass_name;
346 Class::MOP::load_class($possible_full_name);
347 $metaclass_name = $possible_full_name->can('register_implementation')
348 ? $possible_full_name->register_implementation
349 : $possible_full_name;
352 Class::MOP::load_class($metaclass_name);
354 $attr_metaclass_name = $metaclass_name;
357 $attr_metaclass_name = $self->attribute_metaclass;
360 if ($options{traits}) {
362 foreach my $trait (@{$options{traits}}) {
364 my $possible_full_name = 'Moose::Meta::Attribute::Custom::Trait::' . $trait;
365 Class::MOP::load_class($possible_full_name);
366 push @traits => $possible_full_name->can('register_implementation')
367 ? $possible_full_name->register_implementation
368 : $possible_full_name;
371 push @traits => $trait;
375 my $class = Moose::Meta::Class->create_anon_class(
376 superclasses => [ $attr_metaclass_name ],
377 roles => [ @traits ],
381 $attr_metaclass_name = $class->name;
384 return $attr_metaclass_name->new($name, %options);
388 sub _process_inherited_attribute {
389 my ($self, $attr_name, %options) = @_;
390 my $inherited_attr = $self->find_attribute_by_name($attr_name);
391 (defined $inherited_attr)
392 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
393 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
394 return $inherited_attr->clone_and_inherit_options(%options);
398 # kind of a kludge to handle Class::MOP::Attributes
399 return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options);
403 ## -------------------------------------------------
405 use Moose::Meta::Method::Constructor;
406 use Moose::Meta::Method::Destructor;
408 # This could be done by using SUPER and altering ->options
409 # I am keeping it this way to make it more explicit.
410 sub create_immutable_transformer {
412 my $class = Class::MOP::Immutable->new($self, {
413 read_only => [qw/superclasses/],
421 remove_package_symbol
425 class_precedence_list => 'ARRAY',
426 compute_all_applicable_attributes => 'ARRAY',
427 get_meta_instance => 'SCALAR',
428 get_method_map => 'SCALAR',
430 calculate_all_roles => 'ARRAY',
438 $self->SUPER::make_immutable
440 constructor_class => 'Moose::Meta::Method::Constructor',
441 destructor_class => 'Moose::Meta::Method::Destructor',
442 inline_destructor => 1,
444 # no need to do this,
445 # Moose always does it
446 inline_accessors => 0,
459 Moose::Meta::Class - The Moose metaclass
463 This is a subclass of L<Class::MOP::Class> with Moose specific
466 For the most part, the only time you will ever encounter an
467 instance of this class is if you are doing some serious deep
468 introspection. To really understand this class, you need to refer
469 to the L<Class::MOP::Class> documentation.
479 Overrides original to accept a list of roles to apply to
482 my $metaclass = Moose::Meta::Class->create( 'New::Class', roles => [...] );
484 =item B<create_anon_class>
486 Overrides original to support roles and caching.
488 my $metaclass = Moose::Meta::Class->create_anon_class(
489 superclasses => ['Foo'],
490 roles => [qw/Some Roles Go Here/],
494 =item B<make_immutable>
496 Override original to add default options for inlining destructor
497 and altering the Constructor metaclass.
499 =item B<create_immutable_transformer>
501 Override original to lock C<add_role> and memoize C<calculate_all_roles>
505 We override this method to support the C<trigger> attribute option.
507 =item B<construct_instance>
509 This provides some Moose specific extensions to this method, you
510 almost never call this method directly unless you really know what
513 This method makes sure to handle the moose weak-ref, type-constraint
514 and type coercion features.
516 =item B<get_method_map>
518 This accommodates Moose::Meta::Role::Method instances, which are
519 aliased, instead of added, but still need to be counted as valid
522 =item B<add_override_method_modifier ($name, $method)>
524 This will create an C<override> method modifier for you, and install
527 =item B<add_augment_method_modifier ($name, $method)>
529 This will create an C<augment> method modifier for you, and install
532 =item B<calculate_all_roles>
536 This will return an array of C<Moose::Meta::Role> instances which are
537 attached to this class.
539 =item B<add_role ($role)>
541 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
542 to the list of associated roles.
544 =item B<does_role ($role_name)>
546 This will test if this class C<does> a given C<$role_name>. It will
547 not only check it's local roles, but ask them as well in order to
548 cascade down the role hierarchy.
550 =item B<excludes_role ($role_name)>
552 This will test if this class C<excludes> a given C<$role_name>. It will
553 not only check it's local roles, but ask them as well in order to
554 cascade down the role hierarchy.
556 =item B<add_attribute ($attr_name, %params|$params)>
558 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
559 support for taking the C<$params> as a HASH ref.
565 All complex software has bugs lurking in it, and this module is no
566 exception. If you find a bug please either email me, or add the bug
571 Stevan Little E<lt>stevan@iinteractive.comE<gt>
573 =head1 COPYRIGHT AND LICENSE
575 Copyright 2006-2008 by Infinity Interactive, Inc.
577 L<http://www.iinteractive.com>
579 This library is free software; you can redistribute it and/or modify
580 it under the same terms as Perl itself.