2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.08';
14 use Moose::Meta::Method::Overriden;
16 use base 'Class::MOP::Class';
18 __PACKAGE__->meta->add_attribute('roles' => (
26 $class->SUPER::initialize($pkg,
27 'attribute_metaclass' => 'Moose::Meta::Attribute',
28 'method_metaclass' => 'Moose::Meta::Method',
29 'instance_metaclass' => 'Moose::Meta::Instance',
34 my ($self, $role) = @_;
35 (blessed($role) && $role->isa('Moose::Meta::Role'))
36 || confess "Roles must be instances of Moose::Meta::Role";
37 push @{$self->roles} => $role;
40 sub calculate_all_roles {
43 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
47 my ($self, $role_name) = @_;
49 || confess "You must supply a role name to look for";
50 foreach my $class ($self->class_precedence_list) {
51 next unless $class->can('meta');
52 foreach my $role (@{$class->meta->roles}) {
53 return 1 if $role->does_role($role_name);
60 my ($self, $role_name) = @_;
62 || confess "You must supply a role name to look for";
63 foreach my $class ($self->class_precedence_list) {
64 next unless $class->can('meta');
65 foreach my $role (@{$class->meta->roles}) {
66 return 1 if $role->excludes_role($role_name);
73 my ($class, %params) = @_;
74 my $self = $class->SUPER::new_object(%params);
75 foreach my $attr ($class->compute_all_applicable_attributes()) {
77 # this does not accept undefined
78 # values, nor does it accept false
79 # values to be passed into the init-arg
80 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
81 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
86 sub construct_instance {
87 my ($class, %params) = @_;
88 my $meta_instance = $class->get_meta_instance;
90 # the code below is almost certainly incorrect
91 # but this is foreign inheritence, so we might
92 # have to kludge it in the end.
93 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
94 foreach my $attr ($class->compute_all_applicable_attributes()) {
95 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
105 my $map = $self->{'%!methods'};
107 my $class_name = $self->name;
108 my $method_metaclass = $self->method_metaclass;
110 foreach my $symbol ($self->list_all_package_symbols('CODE')) {
112 my $code = $self->get_package_symbol('&' . $symbol);
114 next if exists $map->{$symbol} &&
115 defined $map->{$symbol} &&
116 $map->{$symbol}->body == $code;
118 my $gv = B::svref_2object($code)->GV;
120 my $pkg = $gv->STASH->NAME;
121 if ($pkg->can('meta') && $pkg->meta && $pkg->meta->isa('Moose::Meta::Role')) {
122 #my $role = $pkg->meta->name;
123 #next unless $self->does_role($role);
126 next if ($gv->STASH->NAME || '') ne $class_name &&
127 ($gv->NAME || '') ne '__ANON__';
130 $map->{$symbol} = $method_metaclass->wrap($code);
136 ### ---------------------------------------------
141 if (scalar @_ == 1 && ref($_[0]) eq 'HASH') {
143 # if it is a HASH ref, we de-ref it.
144 # this will usually mean that it is
146 $self->SUPER::add_attribute($name => %{$_[0]});
149 # otherwise we just pass the args
150 $self->SUPER::add_attribute($name => @_);
154 sub add_override_method_modifier {
155 my ($self, $name, $method, $_super_package) = @_;
156 (!$self->has_method($name))
157 || confess "Cannot add an override method if a local method is already present";
158 # need this for roles ...
159 $_super_package ||= $self->name;
160 my $super = $self->find_next_method_by_name($name);
162 || confess "You cannot override '$name' because it has no super method";
163 $self->add_method($name => Moose::Meta::Method::Overriden->wrap(sub {
166 no warnings 'redefine';
167 local *{$_super_package . '::super'} = sub { $super->(@args) };
168 return $method->(@args);
172 sub add_augment_method_modifier {
173 my ($self, $name, $method) = @_;
174 (!$self->has_method($name))
175 || confess "Cannot add an augment method if a local method is already present";
176 my $super = $self->find_next_method_by_name($name);
178 || confess "You cannot augment '$name' because it has no super method";
179 my $_super_package = $super->package_name;
180 # BUT!,... if this is an overriden method ....
181 if ($super->isa('Moose::Meta::Method::Overriden')) {
182 # we need to be sure that we actually
183 # find the next method, which is not
184 # an 'override' method, the reason is
185 # that an 'override' method will not
186 # be the one calling inner()
187 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
188 $_super_package = $real_super->package_name;
190 $self->add_method($name => sub {
193 no warnings 'redefine';
194 local *{$_super_package . '::inner'} = sub { $method->(@args) };
195 return $super->(@args);
199 ## Private Utility methods ...
201 sub _find_next_method_by_name_which_is_not_overridden {
202 my ($self, $name) = @_;
203 foreach my $method ($self->find_all_methods_by_name($name)) {
204 return $method->{code}
205 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
210 sub _fix_metaclass_incompatability {
211 my ($self, @superclasses) = @_;
212 foreach my $super (@superclasses) {
213 # don't bother if it does not have a meta.
214 next unless $super->can('meta');
215 # if it's meta is a vanilla Moose,
216 # then we can safely ignore it.
217 next if blessed($super->meta) eq 'Moose::Meta::Class';
218 # but if we have anything else,
219 # we need to check it out ...
220 unless (# see if of our metaclass is incompatible
221 ($self->isa(blessed($super->meta)) &&
222 # and see if our instance metaclass is incompatible
223 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
224 # ... and if we are just a vanilla Moose
225 $self->isa('Moose::Meta::Class')) {
226 # re-initialize the meta ...
227 my $super_meta = $super->meta;
229 # We might want to consider actually
230 # transfering any attributes from the
231 # original meta into this one, but in
232 # general you should not have any there
233 # at this point anyway, so it's very
234 # much an obscure edge case anyway
235 $self = $super_meta->reinitialize($self->name => (
236 'attribute_metaclass' => $super_meta->attribute_metaclass,
237 'method_metaclass' => $super_meta->method_metaclass,
238 'instance_metaclass' => $super_meta->instance_metaclass,
245 sub _apply_all_roles {
246 my ($self, @roles) = @_;
247 ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
248 || confess "You can only consume roles, $_ is not a Moose role"
250 if (scalar @roles == 1) {
251 $roles[0]->meta->apply($self);
255 # we should make a Moose::Meta::Role::Composite
256 # which is a smaller version of Moose::Meta::Role
257 # which does not use any package stuff
258 Moose::Meta::Role->combine(
259 map { $_->meta } @roles
264 sub _process_attribute {
265 my ($self, $name, %options) = @_;
266 if ($name =~ /^\+(.*)/) {
267 my $new_attr = $self->_process_inherited_attribute($1, %options);
268 $self->add_attribute($new_attr);
271 if ($options{metaclass}) {
272 Moose::_load_all_classes($options{metaclass});
273 $self->add_attribute($options{metaclass}->new($name, %options));
276 $self->add_attribute($name, %options);
281 sub _process_inherited_attribute {
282 my ($self, $attr_name, %options) = @_;
283 my $inherited_attr = $self->find_attribute_by_name($attr_name);
284 (defined $inherited_attr)
285 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
287 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
288 $new_attr = $inherited_attr->clone_and_inherit_options(%options);
292 # kind of a kludge to handle Class::MOP::Attributes
293 $new_attr = Moose::Meta::Attribute::clone_and_inherit_options(
294 $inherited_attr, %options
300 ## -------------------------------------------------
302 use Moose::Meta::Method::Constructor;
306 # the immutable version of a
307 # particular metaclass is
308 # really class-level data so
309 # we don't want to regenerate
310 # it any more than we need to
311 my $IMMUTABLE_METACLASS;
315 $IMMUTABLE_METACLASS ||= Class::MOP::Immutable->new($self, {
316 read_only => [qw/superclasses/],
324 remove_package_symbol
328 class_precedence_list => 'ARRAY',
329 compute_all_applicable_attributes => 'ARRAY',
330 get_meta_instance => 'SCALAR',
331 get_method_map => 'SCALAR',
333 calculate_all_roles => 'ARRAY',
337 $IMMUTABLE_METACLASS->make_metaclass_immutable(
339 constructor_class => 'Moose::Meta::Method::Constructor',
340 inline_accessors => 0,
354 Moose::Meta::Class - The Moose metaclass
358 This is a subclass of L<Class::MOP::Class> with Moose specific
361 For the most part, the only time you will ever encounter an
362 instance of this class is if you are doing some serious deep
363 introspection. To really understand this class, you need to refer
364 to the L<Class::MOP::Class> documentation.
372 =item B<make_immutable>
376 We override this method to support the C<trigger> attribute option.
378 =item B<construct_instance>
380 This provides some Moose specific extensions to this method, you
381 almost never call this method directly unless you really know what
384 This method makes sure to handle the moose weak-ref, type-constraint
385 and type coercion features.
387 =item B<get_method_map>
389 This accommodates Moose::Meta::Role::Method instances, which are
390 aliased, instead of added, but still need to be counted as valid
393 =item B<add_override_method_modifier ($name, $method)>
395 This will create an C<override> method modifier for you, and install
398 =item B<add_augment_method_modifier ($name, $method)>
400 This will create an C<augment> method modifier for you, and install
403 =item B<calculate_all_roles>
407 This will return an array of C<Moose::Meta::Role> instances which are
408 attached to this class.
410 =item B<add_role ($role)>
412 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
413 to the list of associated roles.
415 =item B<does_role ($role_name)>
417 This will test if this class C<does> a given C<$role_name>. It will
418 not only check it's local roles, but ask them as well in order to
419 cascade down the role hierarchy.
421 =item B<excludes_role ($role_name)>
423 This will test if this class C<excludes> a given C<$role_name>. It will
424 not only check it's local roles, but ask them as well in order to
425 cascade down the role hierarchy.
427 =item B<add_attribute ($attr_name, %params|$params)>
429 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
430 support for taking the C<$params> as a HASH ref.
436 All complex software has bugs lurking in it, and this module is no
437 exception. If you find a bug please either email me, or add the bug
442 Stevan Little E<lt>stevan@iinteractive.comE<gt>
444 =head1 COPYRIGHT AND LICENSE
446 Copyright 2006 by Infinity Interactive, Inc.
448 L<http://www.iinteractive.com>
450 This library is free software; you can redistribute it and/or modify
451 it under the same terms as Perl itself.