2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.15';
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, $role) = @_;
36 (blessed($role) && $role->isa('Moose::Meta::Role'))
37 || confess "Roles must be instances of Moose::Meta::Role";
38 push @{$self->roles} => $role;
41 sub calculate_all_roles {
44 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
48 my ($self, $role_name) = @_;
50 || confess "You must supply a role name to look for";
51 foreach my $class ($self->class_precedence_list) {
52 next unless $class->can('meta');
53 foreach my $role (@{$class->meta->roles}) {
54 return 1 if $role->does_role($role_name);
61 my ($self, $role_name) = @_;
63 || confess "You must supply a role name to look for";
64 foreach my $class ($self->class_precedence_list) {
65 next unless $class->can('meta');
67 # in the pretty rare instance when a Moose metaclass
68 # is itself extended with a role, this check needs to
69 # be done since some items in the class_precedence_list
70 # might in fact be Class::MOP based still.
71 next unless $class->meta->can('roles');
72 foreach my $role (@{$class->meta->roles}) {
73 return 1 if $role->excludes_role($role_name);
80 my ($class, %params) = @_;
81 my $self = $class->SUPER::new_object(%params);
82 foreach my $attr ($class->compute_all_applicable_attributes()) {
84 # this does not accept undefined
85 # values, nor does it accept false
86 # values to be passed into the init-arg
87 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
88 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
93 sub construct_instance {
94 my ($class, %params) = @_;
95 my $meta_instance = $class->get_meta_instance;
97 # the code below is almost certainly incorrect
98 # but this is foreign inheritence, so we might
99 # have to kludge it in the end.
100 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
101 foreach my $attr ($class->compute_all_applicable_attributes()) {
102 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
112 my $map = $self->{'%!methods'};
114 my $class_name = $self->name;
115 my $method_metaclass = $self->method_metaclass;
117 foreach my $symbol ($self->list_all_package_symbols('CODE')) {
119 my $code = $self->get_package_symbol('&' . $symbol);
121 next if exists $map->{$symbol} &&
122 defined $map->{$symbol} &&
123 $map->{$symbol}->body == $code;
125 my $gv = B::svref_2object($code)->GV;
127 my $pkg = $gv->STASH->NAME;
128 if ($pkg->can('meta')
130 # we don't know what ->meta we are calling
131 # here, so we need to be careful cause it
132 # just might blow up at us, or just complain
133 # loudly (in the case of Curses.pm) so we
134 # just be a little overly cautious here.
136 && eval { no warnings; blessed($pkg->meta) }
137 && $pkg->meta->isa('Moose::Meta::Role')) {
138 #my $role = $pkg->meta->name;
139 #next unless $self->does_role($role);
142 next if ($gv->STASH->NAME || '') ne $class_name &&
143 ($gv->NAME || '') ne '__ANON__';
146 $map->{$symbol} = $method_metaclass->wrap($code);
152 ### ---------------------------------------------
157 if (scalar @_ == 1 && ref($_[0]) eq 'HASH') {
159 # if it is a HASH ref, we de-ref it.
160 # this will usually mean that it is
162 $self->SUPER::add_attribute($name => %{$_[0]});
165 # otherwise we just pass the args
166 $self->SUPER::add_attribute($name => @_);
170 sub add_override_method_modifier {
171 my ($self, $name, $method, $_super_package) = @_;
172 (!$self->has_method($name))
173 || confess "Cannot add an override method if a local method is already present";
174 # need this for roles ...
175 $_super_package ||= $self->name;
176 my $super = $self->find_next_method_by_name($name);
178 || confess "You cannot override '$name' because it has no super method";
179 $self->add_method($name => Moose::Meta::Method::Overriden->wrap(sub {
181 no warnings 'redefine';
182 if ($Moose::SUPER_SLOT{$_super_package}) {
183 local *{$Moose::SUPER_SLOT{$_super_package}}
184 = sub { $super->(@args) };
185 return $method->(@args);
187 confess "Trying to call override modifier'd method without super()";
192 sub add_augment_method_modifier {
193 my ($self, $name, $method) = @_;
194 (!$self->has_method($name))
195 || confess "Cannot add an augment method if a local method is already present";
196 my $super = $self->find_next_method_by_name($name);
198 || confess "You cannot augment '$name' because it has no super method";
199 my $_super_package = $super->package_name;
200 # BUT!,... if this is an overriden method ....
201 if ($super->isa('Moose::Meta::Method::Overriden')) {
202 # we need to be sure that we actually
203 # find the next method, which is not
204 # an 'override' method, the reason is
205 # that an 'override' method will not
206 # be the one calling inner()
207 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
208 $_super_package = $real_super->package_name;
210 $self->add_method($name => sub {
212 no warnings 'redefine';
213 if ($Moose::INNER_SLOT{$_super_package}) {
214 local *{$Moose::INNER_SLOT{$_super_package}}
215 = sub { $method->(@args) };
216 return $super->(@args);
218 return $super->(@args);
223 ## Private Utility methods ...
225 sub _find_next_method_by_name_which_is_not_overridden {
226 my ($self, $name) = @_;
227 foreach my $method ($self->find_all_methods_by_name($name)) {
228 return $method->{code}
229 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
234 sub _fix_metaclass_incompatability {
235 my ($self, @superclasses) = @_;
236 foreach my $super (@superclasses) {
237 # don't bother if it does not have a meta.
238 next unless $super->can('meta');
239 # get the name, make sure we take
240 # immutable classes into account
241 my $super_meta_name = ($super->meta->is_immutable
242 ? $super->meta->get_mutable_metaclass_name
243 : blessed($super->meta));
244 # if it's meta is a vanilla Moose,
245 # then we can safely ignore it.
246 next if $super_meta_name eq 'Moose::Meta::Class';
247 # but if we have anything else,
248 # we need to check it out ...
249 unless (# see if of our metaclass is incompatible
250 ($self->isa($super_meta_name) &&
251 # and see if our instance metaclass is incompatible
252 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
253 # ... and if we are just a vanilla Moose
254 $self->isa('Moose::Meta::Class')) {
255 # re-initialize the meta ...
256 my $super_meta = $super->meta;
258 # We might want to consider actually
259 # transfering any attributes from the
260 # original meta into this one, but in
261 # general you should not have any there
262 # at this point anyway, so it's very
263 # much an obscure edge case anyway
264 $self = $super_meta->reinitialize($self->name => (
265 'attribute_metaclass' => $super_meta->attribute_metaclass,
266 'method_metaclass' => $super_meta->method_metaclass,
267 'instance_metaclass' => $super_meta->instance_metaclass,
274 sub _apply_all_roles {
275 my ($self, @roles) = @_;
276 ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
277 || confess "You can only consume roles, $_ is not a Moose role"
279 if (scalar @roles == 1) {
280 $roles[0]->meta->apply($self);
284 # we should make a Moose::Meta::Role::Composite
285 # which is a smaller version of Moose::Meta::Role
286 # which does not use any package stuff
287 Moose::Meta::Role->combine(
288 map { $_->meta } @roles
293 sub _process_attribute {
294 my ($self, $name, %options) = @_;
295 if ($name =~ /^\+(.*)/) {
296 my $new_attr = $self->_process_inherited_attribute($1, %options);
297 $self->add_attribute($new_attr);
300 if ($options{metaclass}) {
301 my $metaclass_name = $options{metaclass};
303 my $possible_full_name = 'Moose::Meta::Attribute::Custom::' . $metaclass_name;
304 Class::MOP::load_class($possible_full_name);
305 $metaclass_name = $possible_full_name->can('register_implementation')
306 ? $possible_full_name->register_implementation
307 : $possible_full_name;
310 Class::MOP::load_class($metaclass_name);
312 $self->add_attribute($metaclass_name->new($name, %options));
315 $self->add_attribute($name, %options);
320 sub _process_inherited_attribute {
321 my ($self, $attr_name, %options) = @_;
322 my $inherited_attr = $self->find_attribute_by_name($attr_name);
323 (defined $inherited_attr)
324 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
326 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
327 $new_attr = $inherited_attr->clone_and_inherit_options(%options);
331 # kind of a kludge to handle Class::MOP::Attributes
332 $new_attr = Moose::Meta::Attribute::clone_and_inherit_options(
333 $inherited_attr, %options
339 ## -------------------------------------------------
341 use Moose::Meta::Method::Constructor;
342 use Moose::Meta::Method::Destructor;
344 # This could be done by using SUPER and altering ->options
345 # I am keeping it this way to make it more explicit.
346 sub create_immutable_transformer {
348 my $class = Class::MOP::Immutable->new($self, {
349 read_only => [qw/superclasses/],
357 remove_package_symbol
361 class_precedence_list => 'ARRAY',
362 compute_all_applicable_attributes => 'ARRAY',
363 get_meta_instance => 'SCALAR',
364 get_method_map => 'SCALAR',
366 calculate_all_roles => 'ARRAY',
374 $self->SUPER::make_immutable
376 constructor_class => 'Moose::Meta::Method::Constructor',
377 destructor_class => 'Moose::Meta::Method::Destructor',
378 inline_destructor => 1,
380 # no need to do this,
381 # Moose always does it
382 inline_accessors => 0,
395 Moose::Meta::Class - The Moose metaclass
399 This is a subclass of L<Class::MOP::Class> with Moose specific
402 For the most part, the only time you will ever encounter an
403 instance of this class is if you are doing some serious deep
404 introspection. To really understand this class, you need to refer
405 to the L<Class::MOP::Class> documentation.
413 =item B<make_immutable>
415 Override original to add default options for inlining destructor
416 and altering the Constructor metaclass.
418 =item B<create_immutable_transformer>
420 Override original to lock C<add_role> and memoize C<calculate_all_roles>
424 We override this method to support the C<trigger> attribute option.
426 =item B<construct_instance>
428 This provides some Moose specific extensions to this method, you
429 almost never call this method directly unless you really know what
432 This method makes sure to handle the moose weak-ref, type-constraint
433 and type coercion features.
435 =item B<get_method_map>
437 This accommodates Moose::Meta::Role::Method instances, which are
438 aliased, instead of added, but still need to be counted as valid
441 =item B<add_override_method_modifier ($name, $method)>
443 This will create an C<override> method modifier for you, and install
446 =item B<add_augment_method_modifier ($name, $method)>
448 This will create an C<augment> method modifier for you, and install
451 =item B<calculate_all_roles>
455 This will return an array of C<Moose::Meta::Role> instances which are
456 attached to this class.
458 =item B<add_role ($role)>
460 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
461 to the list of associated roles.
463 =item B<does_role ($role_name)>
465 This will test if this class C<does> a given C<$role_name>. It will
466 not only check it's local roles, but ask them as well in order to
467 cascade down the role hierarchy.
469 =item B<excludes_role ($role_name)>
471 This will test if this class C<excludes> a given C<$role_name>. It will
472 not only check it's local roles, but ask them as well in order to
473 cascade down the role hierarchy.
475 =item B<add_attribute ($attr_name, %params|$params)>
477 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
478 support for taking the C<$params> as a HASH ref.
484 All complex software has bugs lurking in it, and this module is no
485 exception. If you find a bug please either email me, or add the bug
490 Stevan Little E<lt>stevan@iinteractive.comE<gt>
492 =head1 COPYRIGHT AND LICENSE
494 Copyright 2006, 2007 by Infinity Interactive, Inc.
496 L<http://www.iinteractive.com>
498 This library is free software; you can redistribute it and/or modify
499 it under the same terms as Perl itself.