2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.07';
14 use base 'Class::MOP::Class';
16 __PACKAGE__->meta->add_attribute('roles' => (
24 $class->SUPER::initialize($pkg,
25 ':attribute_metaclass' => 'Moose::Meta::Attribute',
26 ':instance_metaclass' => 'Moose::Meta::Instance',
31 my ($self, $role) = @_;
32 (blessed($role) && $role->isa('Moose::Meta::Role'))
33 || confess "Roles must be instances of Moose::Meta::Role";
34 push @{$self->roles} => $role;
37 sub calculate_all_roles {
40 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
44 my ($self, $role_name) = @_;
46 || confess "You must supply a role name to look for";
47 foreach my $class ($self->class_precedence_list) {
48 next unless $class->can('meta');
49 foreach my $role (@{$class->meta->roles}) {
50 return 1 if $role->does_role($role_name);
57 my ($self, $role_name) = @_;
59 || confess "You must supply a role name to look for";
60 foreach my $class ($self->class_precedence_list) {
61 next unless $class->can('meta');
62 foreach my $role (@{$class->meta->roles}) {
63 return 1 if $role->excludes_role($role_name);
70 my ($class, %params) = @_;
71 my $self = $class->SUPER::new_object(%params);
72 foreach my $attr ($class->compute_all_applicable_attributes()) {
74 # this does not accept undefined
75 # values, nor does it accept false
76 # values to be passed into the init-arg
77 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
78 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
83 sub construct_instance {
84 my ($class, %params) = @_;
85 my $meta_instance = $class->get_meta_instance;
87 # the code below is almost certainly incorrect
88 # but this is foreign inheritence, so we might
89 # have to kludge it in the end.
90 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
91 foreach my $attr ($class->compute_all_applicable_attributes()) {
92 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
102 my $map = $self->{'%:methods'};
104 my $class_name = $self->name;
105 my $method_metaclass = $self->method_metaclass;
107 foreach my $symbol ($self->list_all_package_symbols('CODE')) {
109 my $code = $self->get_package_symbol('&' . $symbol);
111 next if exists $map->{$symbol} &&
112 defined $map->{$symbol} &&
113 $map->{$symbol}->body == $code;
115 my $gv = B::svref_2object($code)->GV;
117 my $pkg = $gv->STASH->NAME;
118 if ($pkg->can('meta') && $pkg->meta->isa('Moose::Meta::Role')) {
119 #my $role = $pkg->meta->name;
120 #next unless $self->does_role($role);
123 next if ($gv->STASH->NAME || '') ne $class_name &&
124 ($gv->NAME || '') ne '__ANON__';
127 $map->{$symbol} = $method_metaclass->wrap($code);
133 #sub find_method_by_name {
134 # my ($self, $method_name) = @_;
135 # (defined $method_name && $method_name)
136 # || confess "You must define a method name to find";
137 # # keep a record of what we have seen
138 # # here, this will handle all the
139 # # inheritence issues because we are
140 # # using the &class_precedence_list
142 # foreach my $class ($self->class_precedence_list()) {
143 # next if $seen_class{$class};
144 # $seen_class{$class}++;
145 # # fetch the meta-class ...
146 # my $meta = $self->initialize($class);
147 # return $meta->get_method($method_name)
148 # if $meta->has_method($method_name);
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 {
182 no warnings 'redefine';
183 local *{$_super_package . '::super'} = sub { $super->(@args) };
184 return $method->(@args);
188 sub add_augment_method_modifier {
189 my ($self, $name, $method) = @_;
190 (!$self->has_method($name))
191 || confess "Cannot add an augment method if a local method is already present";
192 my $super = $self->find_next_method_by_name($name);
194 || confess "You cannot augment '$name' because it has no super method";
195 my $_super_package = $super->package_name;
196 # BUT!,... if this is an overriden method ....
197 if ($super->isa('Moose::Meta::Method::Overriden')) {
198 # we need to be sure that we actually
199 # find the next method, which is not
200 # an 'override' method, the reason is
201 # that an 'override' method will not
202 # be the one calling inner()
203 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
204 $_super_package = $real_super->package_name;
206 $self->add_method($name => sub {
209 no warnings 'redefine';
210 local *{$_super_package . '::inner'} = sub { $method->(@args) };
211 return $super->(@args);
215 ## Private Utility methods ...
217 sub _find_next_method_by_name_which_is_not_overridden {
218 my ($self, $name) = @_;
219 foreach my $method ($self->find_all_methods_by_name($name)) {
220 return $method->{code}
221 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
226 sub _fix_metaclass_incompatability {
227 my ($self, @superclasses) = @_;
228 foreach my $super (@superclasses) {
229 # don't bother if it does not have a meta.
230 next unless $super->can('meta');
231 # if it's meta is a vanilla Moose,
232 # then we can safely ignore it.
233 next if blessed($super->meta) eq 'Moose::Meta::Class';
234 # but if we have anything else,
235 # we need to check it out ...
236 unless (# see if of our metaclass is incompatible
237 ($self->isa(blessed($super->meta)) &&
238 # and see if our instance metaclass is incompatible
239 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
240 # ... and if we are just a vanilla Moose
241 $self->isa('Moose::Meta::Class')) {
242 # re-initialize the meta ...
243 my $super_meta = $super->meta;
245 # We might want to consider actually
246 # transfering any attributes from the
247 # original meta into this one, but in
248 # general you should not have any there
249 # at this point anyway, so it's very
250 # much an obscure edge case anyway
251 $self = $super_meta->reinitialize($self->name => (
252 ':attribute_metaclass' => $super_meta->attribute_metaclass,
253 ':method_metaclass' => $super_meta->method_metaclass,
254 ':instance_metaclass' => $super_meta->instance_metaclass,
261 sub _apply_all_roles {
262 my ($self, @roles) = @_;
263 ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
264 || confess "You can only consume roles, $_ is not a Moose role"
266 if (scalar @roles == 1) {
267 $roles[0]->meta->apply($self);
271 # we should make a Moose::Meta::Role::Composite
272 # which is a smaller version of Moose::Meta::Role
273 # which does not use any package stuff
274 Moose::Meta::Role->combine(
275 map { $_->meta } @roles
280 sub _process_attribute {
281 my ($self, $name, %options) = @_;
282 if ($name =~ /^\+(.*)/) {
283 my $new_attr = $self->_process_inherited_attribute($1, %options);
284 $self->add_attribute($new_attr);
287 if ($options{metaclass}) {
288 Moose::_load_all_classes($options{metaclass});
289 $self->add_attribute($options{metaclass}->new($name, %options));
292 $self->add_attribute($name, %options);
297 sub _process_inherited_attribute {
298 my ($self, $attr_name, %options) = @_;
299 my $inherited_attr = $self->find_attribute_by_name($attr_name);
300 (defined $inherited_attr)
301 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
303 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
304 $new_attr = $inherited_attr->clone_and_inherit_options(%options);
308 # kind of a kludge to handle Class::MOP::Attributes
309 $new_attr = Moose::Meta::Attribute::clone_and_inherit_options(
310 $inherited_attr, %options
316 package Moose::Meta::Method::Overriden;
321 our $VERSION = '0.01';
323 use base 'Class::MOP::Method';
333 Moose::Meta::Class - The Moose metaclass
337 This is a subclass of L<Class::MOP::Class> with Moose specific
340 For the most part, the only time you will ever encounter an
341 instance of this class is if you are doing some serious deep
342 introspection. To really understand this class, you need to refer
343 to the L<Class::MOP::Class> documentation.
353 We override this method to support the C<trigger> attribute option.
355 =item B<construct_instance>
357 This provides some Moose specific extensions to this method, you
358 almost never call this method directly unless you really know what
361 This method makes sure to handle the moose weak-ref, type-constraint
362 and type coercion features.
364 =item B<get_method_map>
366 This accommodates Moose::Meta::Role::Method instances, which are
367 aliased, instead of added, but still need to be counted as valid
370 =item B<add_override_method_modifier ($name, $method)>
372 This will create an C<override> method modifier for you, and install
375 =item B<add_augment_method_modifier ($name, $method)>
377 This will create an C<augment> method modifier for you, and install
380 =item B<calculate_all_roles>
384 This will return an array of C<Moose::Meta::Role> instances which are
385 attached to this class.
387 =item B<add_role ($role)>
389 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
390 to the list of associated roles.
392 =item B<does_role ($role_name)>
394 This will test if this class C<does> a given C<$role_name>. It will
395 not only check it's local roles, but ask them as well in order to
396 cascade down the role hierarchy.
398 =item B<excludes_role ($role_name)>
400 This will test if this class C<excludes> a given C<$role_name>. It will
401 not only check it's local roles, but ask them as well in order to
402 cascade down the role hierarchy.
404 =item B<add_attribute ($attr_name, %params|$params)>
406 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
407 support for taking the C<$params> as a HASH ref.
413 All complex software has bugs lurking in it, and this module is no
414 exception. If you find a bug please either email me, or add the bug
419 Stevan Little E<lt>stevan@iinteractive.comE<gt>
421 =head1 COPYRIGHT AND LICENSE
423 Copyright 2006 by Infinity Interactive, Inc.
425 L<http://www.iinteractive.com>
427 This library is free software; you can redistribute it and/or modify
428 it under the same terms as Perl itself.