2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed';
12 our $VERSION = '0.55_01';
13 $VERSION = eval $VERSION;
14 our $AUTHORITY = 'cpan:STEVAN';
16 use Moose::Meta::Method::Overriden;
17 use Moose::Meta::Method::Augmented;
19 use base 'Class::MOP::Class';
21 __PACKAGE__->meta->add_attribute('roles' => (
26 __PACKAGE__->meta->add_attribute('constructor_class' => (
27 accessor => 'constructor_class',
28 default => sub { 'Moose::Meta::Method::Constructor' }
31 __PACKAGE__->meta->add_attribute('destructor_class' => (
32 accessor => 'destructor_class',
33 default => sub { 'Moose::Meta::Method::Destructor' }
39 return Class::MOP::get_metaclass_by_name($pkg)
40 || $class->SUPER::initialize($pkg,
41 'attribute_metaclass' => 'Moose::Meta::Attribute',
42 'method_metaclass' => 'Moose::Meta::Method',
43 'instance_metaclass' => 'Moose::Meta::Instance',
49 my ($self, $package_name, %options) = @_;
51 (ref $options{roles} eq 'ARRAY')
52 || confess "You must pass an ARRAY ref of roles"
53 if exists $options{roles};
55 my $class = $self->SUPER::create($package_name, %options);
57 if (exists $options{roles}) {
58 Moose::Util::apply_all_roles($class, @{$options{roles}});
66 sub create_anon_class {
67 my ($self, %options) = @_;
69 my $cache_ok = delete $options{cache};
71 # something like Super::Class|Super::Class::2=Role|Role::1
72 my $cache_key = join '=' => (
73 join('|', sort @{$options{superclasses} || []}),
74 join('|', sort @{$options{roles} || []}),
77 if ($cache_ok && defined $ANON_CLASSES{$cache_key}) {
78 return $ANON_CLASSES{$cache_key};
81 my $new_class = $self->SUPER::create_anon_class(%options);
83 $ANON_CLASSES{$cache_key} = $new_class
90 my ($self, $role) = @_;
91 (blessed($role) && $role->isa('Moose::Meta::Role'))
92 || confess "Roles must be instances of Moose::Meta::Role";
93 push @{$self->roles} => $role;
96 sub calculate_all_roles {
99 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
103 my ($self, $role_name) = @_;
105 || confess "You must supply a role name to look for";
106 foreach my $class ($self->class_precedence_list) {
107 next unless $class->can('meta') && $class->meta->can('roles');
108 foreach my $role (@{$class->meta->roles}) {
109 return 1 if $role->does_role($role_name);
116 my ($self, $role_name) = @_;
118 || confess "You must supply a role name to look for";
119 foreach my $class ($self->class_precedence_list) {
120 next unless $class->can('meta');
122 # in the pretty rare instance when a Moose metaclass
123 # is itself extended with a role, this check needs to
124 # be done since some items in the class_precedence_list
125 # might in fact be Class::MOP based still.
126 next unless $class->meta->can('roles');
127 foreach my $role (@{$class->meta->roles}) {
128 return 1 if $role->excludes_role($role_name);
136 my $params = @_ == 1 ? $_[0] : {@_};
137 my $self = $class->SUPER::new_object($params);
138 foreach my $attr ($class->compute_all_applicable_attributes()) {
139 # if we have a trigger, then ...
140 if ($attr->can('has_trigger') && $attr->has_trigger) {
141 # make sure we have an init-arg ...
142 if (defined(my $init_arg = $attr->init_arg)) {
143 # now make sure an init-arg was passes ...
144 if (exists $params->{$init_arg}) {
145 # and if get here, fire the trigger
148 # check if there is a coercion
149 ($attr->should_coerce
150 # and if so, we need to grab the
151 # value that is actually been stored
152 ? $attr->get_read_method_ref->($self)
153 # otherwise, just get the value from
154 # the constructor params
155 : $params->{$init_arg}),
165 sub construct_instance {
167 my $params = @_ == 1 ? $_[0] : {@_};
168 my $meta_instance = $class->get_meta_instance;
170 # the code below is almost certainly incorrect
171 # but this is foreign inheritence, so we might
172 # have to kludge it in the end.
173 my $instance = $params->{'__INSTANCE__'} || $meta_instance->create_instance();
174 foreach my $attr ($class->compute_all_applicable_attributes()) {
175 $attr->initialize_instance_slot($meta_instance, $instance, $params);
185 my $current = Class::MOP::check_package_cache_flag($self->name);
187 if (defined $self->{'_package_cache_flag'} && $self->{'_package_cache_flag'} == $current) {
188 return $self->{'methods'};
191 $self->{_package_cache_flag} = $current;
193 my $map = $self->{'methods'};
195 my $class_name = $self->name;
196 my $method_metaclass = $self->method_metaclass;
198 my %all_code = $self->get_all_package_symbols('CODE');
200 foreach my $symbol (keys %all_code) {
201 my $code = $all_code{$symbol};
203 next if exists $map->{$symbol} &&
204 defined $map->{$symbol} &&
205 $map->{$symbol}->body == $code;
207 my ($pkg, $name) = Class::MOP::get_code_info($code);
209 if ($pkg->can('meta')
211 # we don't know what ->meta we are calling
212 # here, so we need to be careful cause it
213 # just might blow up at us, or just complain
214 # loudly (in the case of Curses.pm) so we
215 # just be a little overly cautious here.
217 && eval { no warnings; blessed($pkg->meta) }
218 && $pkg->meta->isa('Moose::Meta::Role')) {
219 #my $role = $pkg->meta->name;
220 #next unless $self->does_role($role);
225 # in 5.10 constant.pm the constants show up
226 # as being in the right package, but in pre-5.10
227 # they show up as constant::__ANON__ so we
228 # make an exception here to be sure that things
229 # work as expected in both.
231 unless ($pkg eq 'constant' && $name eq '__ANON__') {
232 next if ($pkg || '') ne $class_name ||
233 (($name || '') ne '__ANON__' && ($pkg || '') ne $class_name);
238 $map->{$symbol} = $method_metaclass->wrap(
240 package_name => $class_name,
248 ### ---------------------------------------------
252 $self->SUPER::add_attribute(
253 (blessed $_[0] && $_[0]->isa('Class::MOP::Attribute')
255 : $self->_process_attribute(@_))
259 sub add_override_method_modifier {
260 my ($self, $name, $method, $_super_package) = @_;
262 (!$self->has_method($name))
263 || confess "Cannot add an override method if a local method is already present";
265 $self->add_method($name => Moose::Meta::Method::Overriden->new(
268 package => $_super_package, # need this for roles
273 sub add_augment_method_modifier {
274 my ($self, $name, $method) = @_;
275 (!$self->has_method($name))
276 || confess "Cannot add an augment method if a local method is already present";
278 $self->add_method($name => Moose::Meta::Method::Augmented->new(
285 ## Private Utility methods ...
287 sub _find_next_method_by_name_which_is_not_overridden {
288 my ($self, $name) = @_;
289 foreach my $method ($self->find_all_methods_by_name($name)) {
290 return $method->{code}
291 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
296 sub _fix_metaclass_incompatability {
297 my ($self, @superclasses) = @_;
298 foreach my $super (@superclasses) {
299 # don't bother if it does not have a meta.
300 my $meta = Class::MOP::Class->initialize($super) or next;
301 next unless $meta->isa("Class::MOP::Class");
303 # get the name, make sure we take
304 # immutable classes into account
306 = $meta->is_immutable
307 ? $meta->get_mutable_metaclass_name
311 # if our metaclass is compatible
312 $self->isa($super_meta_name)
314 # and our instance metaclass is also compatible then no
316 $self->instance_metaclass->isa( $meta->instance_metaclass );
318 if ( $meta->isa( ref($self) ) ) {
319 unless ( $self->is_pristine ) {
320 confess "Not reinitializing metaclass for "
322 . ", it isn't pristine";
325 # also check values %{ $self->get_method_map } for any generated methods
328 # We might want to consider actually
329 # transfering any attributes from the
330 # original meta into this one, but in
331 # general you should not have any there
332 # at this point anyway, so it's very
333 # much an obscure edge case anyway
334 $self = $meta->reinitialize(
336 attribute_metaclass => $meta->attribute_metaclass,
337 method_metaclass => $meta->method_metaclass,
338 instance_metaclass => $meta->instance_metaclass,
347 # this was crap anyway, see
348 # Moose::Util::apply_all_roles
350 sub _apply_all_roles {
351 Carp::croak 'DEPRECATED: use Moose::Util::apply_all_roles($meta, @roles) instead'
354 sub _process_attribute {
355 my ( $self, $name, @args ) = @_;
357 @args = %{$args[0]} if scalar @args == 1 && ref($args[0]) eq 'HASH';
359 if ($name =~ /^\+(.*)/) {
360 return $self->_process_inherited_attribute($1, @args);
363 return $self->_process_new_attribute($name, @args);
367 sub _process_new_attribute {
368 my ( $self, $name, @args ) = @_;
370 $self->attribute_metaclass->interpolate_class_and_new($name, @args);
373 sub _process_inherited_attribute {
374 my ($self, $attr_name, %options) = @_;
375 my $inherited_attr = $self->find_attribute_by_name($attr_name);
376 (defined $inherited_attr)
377 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
378 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
379 return $inherited_attr->clone_and_inherit_options(%options);
383 # kind of a kludge to handle Class::MOP::Attributes
384 return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options);
388 ## -------------------------------------------------
390 use Moose::Meta::Method::Constructor;
391 use Moose::Meta::Method::Destructor;
393 # This could be done by using SUPER and altering ->options
394 # I am keeping it this way to make it more explicit.
395 sub create_immutable_transformer {
397 my $class = Class::MOP::Immutable->new($self, {
398 read_only => [qw/superclasses/],
405 remove_package_symbol
409 class_precedence_list => 'ARRAY',
410 linearized_isa => 'ARRAY', # FIXME perl 5.10 memoizes this on its own, no need?
411 get_all_methods => 'ARRAY',
412 #get_all_attributes => 'ARRAY', # it's an alias, no need, but maybe in the future
413 compute_all_applicable_attributes => 'ARRAY',
414 get_meta_instance => 'SCALAR',
415 get_method_map => 'SCALAR',
416 calculate_all_roles => 'ARRAY',
419 # this is ugly, but so are typeglobs,
420 # so whattayahgonnadoboutit
423 add_package_symbol => sub {
424 my $original = shift;
425 confess "Cannot add package symbols to an immutable metaclass"
426 unless (caller(2))[3] eq 'Class::MOP::Package::get_package_symbol';
427 goto $original->body;
436 $self->SUPER::make_immutable
438 constructor_class => $self->constructor_class,
439 destructor_class => $self->destructor_class,
440 inline_destructor => 1,
442 # no need to do this,
443 # Moose always does it
444 inline_accessors => 0,
457 Moose::Meta::Class - The Moose metaclass
461 This is a subclass of L<Class::MOP::Class> with Moose specific
464 For the most part, the only time you will ever encounter an
465 instance of this class is if you are doing some serious deep
466 introspection. To really understand this class, you need to refer
467 to the L<Class::MOP::Class> documentation.
477 Overrides original to accept a list of roles to apply to
480 my $metaclass = Moose::Meta::Class->create( 'New::Class', roles => [...] );
482 =item B<create_anon_class>
484 Overrides original to support roles and caching.
486 my $metaclass = Moose::Meta::Class->create_anon_class(
487 superclasses => ['Foo'],
488 roles => [qw/Some Roles Go Here/],
492 =item B<make_immutable>
494 Override original to add default options for inlining destructor
495 and altering the Constructor metaclass.
497 =item B<create_immutable_transformer>
499 Override original to lock C<add_role> and memoize C<calculate_all_roles>
503 We override this method to support the C<trigger> attribute option.
505 =item B<construct_instance>
507 This provides some Moose specific extensions to this method, you
508 almost never call this method directly unless you really know what
511 This method makes sure to handle the moose weak-ref, type-constraint
512 and type coercion features.
514 =item B<get_method_map>
516 This accommodates Moose::Meta::Role::Method instances, which are
517 aliased, instead of added, but still need to be counted as valid
520 =item B<add_override_method_modifier ($name, $method)>
522 This will create an C<override> method modifier for you, and install
525 =item B<add_augment_method_modifier ($name, $method)>
527 This will create an C<augment> method modifier for you, and install
530 =item B<calculate_all_roles>
534 This will return an array of C<Moose::Meta::Role> instances which are
535 attached to this class.
537 =item B<add_role ($role)>
539 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
540 to the list of associated roles.
542 =item B<does_role ($role_name)>
544 This will test if this class C<does> a given C<$role_name>. It will
545 not only check it's local roles, but ask them as well in order to
546 cascade down the role hierarchy.
548 =item B<excludes_role ($role_name)>
550 This will test if this class C<excludes> a given C<$role_name>. It will
551 not only check it's local roles, but ask them as well in order to
552 cascade down the role hierarchy.
554 =item B<add_attribute ($attr_name, %params|$params)>
556 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
557 support for taking the C<$params> as a HASH ref.
563 All complex software has bugs lurking in it, and this module is no
564 exception. If you find a bug please either email me, or add the bug
569 Stevan Little E<lt>stevan@iinteractive.comE<gt>
571 =head1 COPYRIGHT AND LICENSE
573 Copyright 2006-2008 by Infinity Interactive, Inc.
575 L<http://www.iinteractive.com>
577 This library is free software; you can redistribute it and/or modify
578 it under the same terms as Perl itself.