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, $instance, \%params)
98 my ($self, $method_name) = @_;
99 (defined $method_name && $method_name)
100 || confess "You must define a method name";
102 my $sub_name = ($self->name . '::' . $method_name);
105 return 0 if !defined(&{$sub_name});
106 my $method = \&{$sub_name};
108 return 1 if blessed($method) && $method->isa('Moose::Meta::Role::Method');
109 return $self->SUPER::has_method($method_name);
115 if (scalar @_ == 1 && ref($_[0]) eq 'HASH') {
117 # if it is a HASH ref, we de-ref it.
118 # this will usually mean that it is
120 $self->SUPER::add_attribute($name => %{$_[0]});
123 # otherwise we just pass the args
124 $self->SUPER::add_attribute($name => @_);
128 sub add_override_method_modifier {
129 my ($self, $name, $method, $_super_package) = @_;
130 (!$self->has_method($name))
131 || confess "Cannot add an override method if a local method is already present";
132 # need this for roles ...
133 $_super_package ||= $self->name;
134 my $super = $self->find_next_method_by_name($name);
136 || confess "You cannot override '$name' because it has no super method";
137 $self->add_method($name => bless sub {
140 no warnings 'redefine';
141 local *{$_super_package . '::super'} = sub { $super->(@args) };
142 return $method->(@args);
143 } => 'Moose::Meta::Method::Overriden');
146 sub add_augment_method_modifier {
147 my ($self, $name, $method) = @_;
148 (!$self->has_method($name))
149 || confess "Cannot add an augment method if a local method is already present";
150 my $super = $self->find_next_method_by_name($name);
152 || confess "You cannot augment '$name' because it has no super method";
153 my $_super_package = $super->package_name;
154 # BUT!,... if this is an overriden method ....
155 if ($super->isa('Moose::Meta::Method::Overriden')) {
156 # we need to be sure that we actually
157 # find the next method, which is not
158 # an 'override' method, the reason is
159 # that an 'override' method will not
160 # be the one calling inner()
161 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
162 $_super_package = $real_super->package_name;
164 $self->add_method($name => sub {
167 no warnings 'redefine';
168 local *{$_super_package . '::inner'} = sub { $method->(@args) };
169 return $super->(@args);
173 ## Private Utility methods ...
175 sub _find_next_method_by_name_which_is_not_overridden {
176 my ($self, $name) = @_;
177 my @methods = $self->find_all_methods_by_name($name);
178 foreach my $method (@methods) {
179 return $method->{code}
180 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
185 sub _fix_metaclass_incompatability {
186 my ($self, @superclasses) = @_;
187 foreach my $super (@superclasses) {
188 # don't bother if it does not have a meta.
189 next unless $super->can('meta');
190 # if it's meta is a vanilla Moose,
191 # then we can safely ignore it.
192 next if blessed($super->meta) eq 'Moose::Meta::Class';
193 # but if we have anything else,
194 # we need to check it out ...
195 unless (# see if of our metaclass is incompatible
196 ($self->isa(blessed($super->meta)) &&
197 # and see if our instance metaclass is incompatible
198 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
199 # ... and if we are just a vanilla Moose
200 $self->isa('Moose::Meta::Class')) {
201 # re-initialize the meta ...
202 my $super_meta = $super->meta;
204 # We might want to consider actually
205 # transfering any attributes from the
206 # original meta into this one, but in
207 # general you should not have any there
208 # at this point anyway, so it's very
209 # much an obscure edge case anyway
210 $self = $super_meta->reinitialize($self->name => (
211 ':attribute_metaclass' => $super_meta->attribute_metaclass,
212 ':method_metaclass' => $super_meta->method_metaclass,
213 ':instance_metaclass' => $super_meta->instance_metaclass,
220 sub _apply_all_roles {
221 my ($self, @roles) = @_;
222 ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
223 || confess "You can only consume roles, $_ is not a Moose role"
225 if (scalar @roles == 1) {
226 $roles[0]->meta->apply($self);
229 Moose::Meta::Role->combine(
230 map { $_->meta } @roles
235 sub _process_attribute {
236 my ($self, $name, %options) = @_;
237 if ($name =~ /^\+(.*)/) {
238 my $new_attr = $self->_process_inherited_attribute($1, %options);
239 $self->add_attribute($new_attr);
242 if ($options{metaclass}) {
243 Moose::_load_all_classes($options{metaclass});
244 $self->add_attribute($options{metaclass}->new($name, %options));
247 $self->add_attribute($name, %options);
252 sub _process_inherited_attribute {
253 my ($self, $attr_name, %options) = @_;
254 my $inherited_attr = $self->find_attribute_by_name($attr_name);
255 (defined $inherited_attr)
256 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
258 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
259 $new_attr = $inherited_attr->clone_and_inherit_options(%options);
263 # kind of a kludge to handle Class::MOP::Attributes
264 $new_attr = Moose::Meta::Attribute::clone_and_inherit_options(
265 $inherited_attr, %options
271 package Moose::Meta::Method::Overriden;
276 our $VERSION = '0.01';
278 use base 'Class::MOP::Method';
288 Moose::Meta::Class - The Moose metaclass
292 This is a subclass of L<Class::MOP::Class> with Moose specific
295 For the most part, the only time you will ever encounter an
296 instance of this class is if you are doing some serious deep
297 introspection. To really understand this class, you need to refer
298 to the L<Class::MOP::Class> documentation.
308 We override this method to support the C<trigger> attribute option.
310 =item B<construct_instance>
312 This provides some Moose specific extensions to this method, you
313 almost never call this method directly unless you really know what
316 This method makes sure to handle the moose weak-ref, type-constraint
317 and type coercion features.
319 =item B<has_method ($name)>
321 This accomidates Moose::Meta::Role::Method instances, which are
322 aliased, instead of added, but still need to be counted as valid
325 =item B<add_override_method_modifier ($name, $method)>
327 This will create an C<override> method modifier for you, and install
330 =item B<add_augment_method_modifier ($name, $method)>
332 This will create an C<augment> method modifier for you, and install
335 =item B<calculate_all_roles>
339 This will return an array of C<Moose::Meta::Role> instances which are
340 attached to this class.
342 =item B<add_role ($role)>
344 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
345 to the list of associated roles.
347 =item B<does_role ($role_name)>
349 This will test if this class C<does> a given C<$role_name>. It will
350 not only check it's local roles, but ask them as well in order to
351 cascade down the role hierarchy.
353 =item B<excludes_role ($role_name)>
355 This will test if this class C<excludes> a given C<$role_name>. It will
356 not only check it's local roles, but ask them as well in order to
357 cascade down the role hierarchy.
359 =item B<add_attribute ($attr_name, %params|$params)>
361 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
362 support for taking the C<$params> as a HASH ref.
368 All complex software has bugs lurking in it, and this module is no
369 exception. If you find a bug please either email me, or add the bug
374 Stevan Little E<lt>stevan@iinteractive.comE<gt>
376 =head1 COPYRIGHT AND LICENSE
378 Copyright 2006 by Infinity Interactive, Inc.
380 L<http://www.iinteractive.com>
382 This library is free software; you can redistribute it and/or modify
383 it under the same terms as Perl itself.