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
305 my $super_meta_name = ($meta->is_immutable
306 ? $meta->get_mutable_metaclass_name
309 # but if we have anything else,
310 # we need to check it out ...
311 unless (# see if of our metaclass is incompatible
312 $self->isa($super_meta_name)
314 # and see if our instance metaclass is incompatible
315 $self->instance_metaclass->isa($meta->instance_metaclass)
317 if ( $meta->isa(ref($self)) ) {
318 unless ( $self->is_pristine ) {
319 confess "Not reinitializing metaclass for " . $self->name . ", it isn't pristine";
321 # also check values %{ $self->get_method_map } for any generated methods
324 # We might want to consider actually
325 # transfering any attributes from the
326 # original meta into this one, but in
327 # general you should not have any there
328 # at this point anyway, so it's very
329 # much an obscure edge case anyway
330 $self = $meta->reinitialize(
332 attribute_metaclass => $meta->attribute_metaclass,
333 method_metaclass => $meta->method_metaclass,
334 instance_metaclass => $meta->instance_metaclass,
337 # this will be called soon enough, for now we let it slide
338 # $self->check_metaclass_compatability()
346 # this was crap anyway, see
347 # Moose::Util::apply_all_roles
349 sub _apply_all_roles {
350 Carp::croak 'DEPRECATED: use Moose::Util::apply_all_roles($meta, @roles) instead'
353 sub _process_attribute {
354 my ( $self, $name, @args ) = @_;
356 @args = %{$args[0]} if scalar @args == 1 && ref($args[0]) eq 'HASH';
358 if ($name =~ /^\+(.*)/) {
359 return $self->_process_inherited_attribute($1, @args);
362 return $self->_process_new_attribute($name, @args);
366 sub _process_new_attribute {
367 my ( $self, $name, @args ) = @_;
369 $self->attribute_metaclass->interpolate_class_and_new($name, @args);
372 sub _process_inherited_attribute {
373 my ($self, $attr_name, %options) = @_;
374 my $inherited_attr = $self->find_attribute_by_name($attr_name);
375 (defined $inherited_attr)
376 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
377 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
378 return $inherited_attr->clone_and_inherit_options(%options);
382 # kind of a kludge to handle Class::MOP::Attributes
383 return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options);
387 ## -------------------------------------------------
389 use Moose::Meta::Method::Constructor;
390 use Moose::Meta::Method::Destructor;
392 # This could be done by using SUPER and altering ->options
393 # I am keeping it this way to make it more explicit.
394 sub create_immutable_transformer {
396 my $class = Class::MOP::Immutable->new($self, {
397 read_only => [qw/superclasses/],
404 remove_package_symbol
408 class_precedence_list => 'ARRAY',
409 linearized_isa => 'ARRAY', # FIXME perl 5.10 memoizes this on its own, no need?
410 get_all_methods => 'ARRAY',
411 #get_all_attributes => 'ARRAY', # it's an alias, no need, but maybe in the future
412 compute_all_applicable_attributes => 'ARRAY',
413 get_meta_instance => 'SCALAR',
414 get_method_map => 'SCALAR',
415 calculate_all_roles => 'ARRAY',
418 # this is ugly, but so are typeglobs,
419 # so whattayahgonnadoboutit
422 add_package_symbol => sub {
423 my $original = shift;
424 confess "Cannot add package symbols to an immutable metaclass"
425 unless (caller(2))[3] eq 'Class::MOP::Package::get_package_symbol';
426 goto $original->body;
435 $self->SUPER::make_immutable
437 constructor_class => $self->constructor_class,
438 destructor_class => $self->destructor_class,
439 inline_destructor => 1,
441 # no need to do this,
442 # Moose always does it
443 inline_accessors => 0,
456 Moose::Meta::Class - The Moose metaclass
460 This is a subclass of L<Class::MOP::Class> with Moose specific
463 For the most part, the only time you will ever encounter an
464 instance of this class is if you are doing some serious deep
465 introspection. To really understand this class, you need to refer
466 to the L<Class::MOP::Class> documentation.
476 Overrides original to accept a list of roles to apply to
479 my $metaclass = Moose::Meta::Class->create( 'New::Class', roles => [...] );
481 =item B<create_anon_class>
483 Overrides original to support roles and caching.
485 my $metaclass = Moose::Meta::Class->create_anon_class(
486 superclasses => ['Foo'],
487 roles => [qw/Some Roles Go Here/],
491 =item B<make_immutable>
493 Override original to add default options for inlining destructor
494 and altering the Constructor metaclass.
496 =item B<create_immutable_transformer>
498 Override original to lock C<add_role> and memoize C<calculate_all_roles>
502 We override this method to support the C<trigger> attribute option.
504 =item B<construct_instance>
506 This provides some Moose specific extensions to this method, you
507 almost never call this method directly unless you really know what
510 This method makes sure to handle the moose weak-ref, type-constraint
511 and type coercion features.
513 =item B<get_method_map>
515 This accommodates Moose::Meta::Role::Method instances, which are
516 aliased, instead of added, but still need to be counted as valid
519 =item B<add_override_method_modifier ($name, $method)>
521 This will create an C<override> method modifier for you, and install
524 =item B<add_augment_method_modifier ($name, $method)>
526 This will create an C<augment> method modifier for you, and install
529 =item B<calculate_all_roles>
533 This will return an array of C<Moose::Meta::Role> instances which are
534 attached to this class.
536 =item B<add_role ($role)>
538 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
539 to the list of associated roles.
541 =item B<does_role ($role_name)>
543 This will test if this class C<does> a given C<$role_name>. It will
544 not only check it's local roles, but ask them as well in order to
545 cascade down the role hierarchy.
547 =item B<excludes_role ($role_name)>
549 This will test if this class C<excludes> a given C<$role_name>. It will
550 not only check it's local roles, but ask them as well in order to
551 cascade down the role hierarchy.
553 =item B<add_attribute ($attr_name, %params|$params)>
555 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
556 support for taking the C<$params> as a HASH ref.
562 All complex software has bugs lurking in it, and this module is no
563 exception. If you find a bug please either email me, or add the bug
568 Stevan Little E<lt>stevan@iinteractive.comE<gt>
570 =head1 COPYRIGHT AND LICENSE
572 Copyright 2006-2008 by Infinity Interactive, Inc.
574 L<http://www.iinteractive.com>
576 This library is free software; you can redistribute it and/or modify
577 it under the same terms as Perl itself.