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} => $role;
38 my ($self, $role_name) = @_;
40 || confess "You must supply a role name to look for";
41 foreach my $class ($self->class_precedence_list) {
42 next unless $class->can('meta');
43 foreach my $role (@{$class->meta->roles}) {
44 return 1 if $role->does_role($role_name);
51 my ($self, $role_name) = @_;
53 || confess "You must supply a role name to look for";
54 foreach my $class ($self->class_precedence_list) {
55 next unless $class->can('meta');
56 foreach my $role (@{$class->meta->roles}) {
57 return 1 if $role->excludes_role($role_name);
64 my ($class, %params) = @_;
65 my $self = $class->SUPER::new_object(%params);
66 foreach my $attr ($class->compute_all_applicable_attributes()) {
67 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
68 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
73 sub construct_instance {
74 my ($class, %params) = @_;
75 my $meta_instance = $class->get_meta_instance;
77 # the code below is almost certainly incorrect
78 # but this is foreign inheritence, so we might
79 # have to kludge it in the end.
80 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
81 foreach my $attr ($class->compute_all_applicable_attributes()) {
82 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
88 my ($self, $method_name) = @_;
89 (defined $method_name && $method_name)
90 || confess "You must define a method name";
92 my $sub_name = ($self->name . '::' . $method_name);
95 return 0 if !defined(&{$sub_name});
96 my $method = \&{$sub_name};
98 return 1 if blessed($method) && $method->isa('Moose::Meta::Role::Method');
99 return $self->SUPER::has_method($method_name);
105 if (scalar @_ == 1 && ref($_[0]) eq 'HASH') {
107 # if it is a HASH ref, we de-ref it.
108 # this will usually mean that it is
110 $self->SUPER::add_attribute($name => %{$_[0]});
113 # otherwise we just pass the args
114 $self->SUPER::add_attribute($name => @_);
118 sub add_override_method_modifier {
119 my ($self, $name, $method, $_super_package) = @_;
120 (!$self->has_method($name))
121 || confess "Cannot add an override method if a local method is already present";
122 # need this for roles ...
123 $_super_package ||= $self->name;
124 my $super = $self->find_next_method_by_name($name);
126 || confess "You cannot override '$name' because it has no super method";
127 $self->add_method($name => bless sub {
130 no warnings 'redefine';
131 local *{$_super_package . '::super'} = sub { $super->(@args) };
132 return $method->(@args);
133 } => 'Moose::Meta::Method::Overriden');
136 sub add_augment_method_modifier {
137 my ($self, $name, $method) = @_;
138 (!$self->has_method($name))
139 || confess "Cannot add an augment method if a local method is already present";
140 my $super = $self->find_next_method_by_name($name);
142 || confess "You cannot augment '$name' because it has no super method";
143 my $_super_package = $super->package_name;
144 # BUT!,... if this is an overriden method ....
145 if ($super->isa('Moose::Meta::Method::Overriden')) {
146 # we need to be sure that we actually
147 # find the next method, which is not
148 # an 'override' method, the reason is
149 # that an 'override' method will not
150 # be the one calling inner()
151 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
152 $_super_package = $real_super->package_name;
154 $self->add_method($name => sub {
157 no warnings 'redefine';
158 local *{$_super_package . '::inner'} = sub { $method->(@args) };
159 return $super->(@args);
163 ## Private Utility methods ...
165 sub _find_next_method_by_name_which_is_not_overridden {
166 my ($self, $name) = @_;
167 my @methods = $self->find_all_methods_by_name($name);
168 foreach my $method (@methods) {
169 return $method->{code}
170 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
175 sub _fix_metaclass_incompatability {
176 my ($self, @superclasses) = @_;
177 foreach my $super (@superclasses) {
178 # don't bother if it does not have a meta.
179 next unless $super->can('meta');
180 # if it's meta is a vanilla Moose,
181 # then we can safely ignore it.
182 next if blessed($super->meta) eq 'Moose::Meta::Class';
183 # but if we have anything else,
184 # we need to check it out ...
185 unless (# see if of our metaclass is incompatible
186 ($self->isa(blessed($super->meta)) &&
187 # and see if our instance metaclass is incompatible
188 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
189 # ... and if we are just a vanilla Moose
190 $self->isa('Moose::Meta::Class')) {
191 # re-initialize the meta ...
192 my $super_meta = $super->meta;
194 # We might want to consider actually
195 # transfering any attributes from the
196 # original meta into this one, but in
197 # general you should not have any there
198 # at this point anyway, so it's very
199 # much an obscure edge case anyway
200 $self = $super_meta->reinitialize($self->name => (
201 ':attribute_metaclass' => $super_meta->attribute_metaclass,
202 ':method_metaclass' => $super_meta->method_metaclass,
203 ':instance_metaclass' => $super_meta->instance_metaclass,
210 sub _apply_all_roles {
211 my ($self, @roles) = @_;
212 ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
213 || confess "You can only consume roles, $_ is not a Moose role"
215 if (scalar @roles == 1) {
216 $roles[0]->meta->apply($self);
219 Moose::Meta::Role->combine(
220 map { $_->meta } @roles
225 sub _process_attribute {
226 my ($self, $name, %options) = @_;
227 if ($name =~ /^\+(.*)/) {
228 my $new_attr = $self->_process_inherited_attribute($1, %options);
229 $self->add_attribute($new_attr);
232 if ($options{metaclass}) {
233 Moose::_load_all_classes($options{metaclass});
234 $self->add_attribute($options{metaclass}->new($name, %options));
237 $self->add_attribute($name, %options);
242 sub _process_inherited_attribute {
243 my ($self, $attr_name, %options) = @_;
244 my $inherited_attr = $self->find_attribute_by_name($attr_name);
245 (defined $inherited_attr)
246 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
248 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
249 $new_attr = $inherited_attr->clone_and_inherit_options(%options);
253 # kind of a kludge to handle Class::MOP::Attributes
254 $new_attr = Moose::Meta::Attribute::clone_and_inherit_options(
255 $inherited_attr, %options
261 package Moose::Meta::Method::Overriden;
266 our $VERSION = '0.01';
268 use base 'Class::MOP::Method';
278 Moose::Meta::Class - The Moose metaclass
282 This is a subclass of L<Class::MOP::Class> with Moose specific
285 For the most part, the only time you will ever encounter an
286 instance of this class is if you are doing some serious deep
287 introspection. To really understand this class, you need to refer
288 to the L<Class::MOP::Class> documentation.
298 We override this method to support the C<trigger> attribute option.
300 =item B<construct_instance>
302 This provides some Moose specific extensions to this method, you
303 almost never call this method directly unless you really know what
306 This method makes sure to handle the moose weak-ref, type-constraint
307 and type coercion features.
309 =item B<has_method ($name)>
311 This accomidates Moose::Meta::Role::Method instances, which are
312 aliased, instead of added, but still need to be counted as valid
315 =item B<add_override_method_modifier ($name, $method)>
317 This will create an C<override> method modifier for you, and install
320 =item B<add_augment_method_modifier ($name, $method)>
322 This will create an C<augment> method modifier for you, and install
327 This will return an array of C<Moose::Meta::Role> instances which are
328 attached to this class.
330 =item B<add_role ($role)>
332 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
333 to the list of associated roles.
335 =item B<does_role ($role_name)>
337 This will test if this class C<does> a given C<$role_name>. It will
338 not only check it's local roles, but ask them as well in order to
339 cascade down the role hierarchy.
341 =item B<excludes_role ($role_name)>
343 This will test if this class C<excludes> a given C<$role_name>. It will
344 not only check it's local roles, but ask them as well in order to
345 cascade down the role hierarchy.
347 =item B<add_attribute ($attr_name, %params|$params)>
349 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
350 support for taking the C<$params> as a HASH ref.
356 All complex software has bugs lurking in it, and this module is no
357 exception. If you find a bug please either email me, or add the bug
362 Stevan Little E<lt>stevan@iinteractive.comE<gt>
364 =head1 COPYRIGHT AND LICENSE
366 Copyright 2006 by Infinity Interactive, Inc.
368 L<http://www.iinteractive.com>
370 This library is free software; you can redistribute it and/or modify
371 it under the same terms as Perl itself.