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 #sub find_method_by_name {
137 # my ($self, $method_name) = @_;
138 # (defined $method_name && $method_name)
139 # || confess "You must define a method name to find";
140 # # keep a record of what we have seen
141 # # here, this will handle all the
142 # # inheritence issues because we are
143 # # using the &class_precedence_list
145 # foreach my $class ($self->class_precedence_list()) {
146 # next if $seen_class{$class};
147 # $seen_class{$class}++;
148 # # fetch the meta-class ...
149 # my $meta = $self->initialize($class);
150 # return $meta->get_method($method_name)
151 # if $meta->has_method($method_name);
155 ### ---------------------------------------------
160 if (scalar @_ == 1 && ref($_[0]) eq 'HASH') {
162 # if it is a HASH ref, we de-ref it.
163 # this will usually mean that it is
165 $self->SUPER::add_attribute($name => %{$_[0]});
168 # otherwise we just pass the args
169 $self->SUPER::add_attribute($name => @_);
173 sub add_override_method_modifier {
174 my ($self, $name, $method, $_super_package) = @_;
175 (!$self->has_method($name))
176 || confess "Cannot add an override method if a local method is already present";
177 # need this for roles ...
178 $_super_package ||= $self->name;
179 my $super = $self->find_next_method_by_name($name);
181 || confess "You cannot override '$name' because it has no super method";
182 $self->add_method($name => Moose::Meta::Method::Overriden->wrap(sub {
185 no warnings 'redefine';
186 local *{$_super_package . '::super'} = sub { $super->(@args) };
187 return $method->(@args);
191 sub add_augment_method_modifier {
192 my ($self, $name, $method) = @_;
193 (!$self->has_method($name))
194 || confess "Cannot add an augment method if a local method is already present";
195 my $super = $self->find_next_method_by_name($name);
197 || confess "You cannot augment '$name' because it has no super method";
198 my $_super_package = $super->package_name;
199 # BUT!,... if this is an overriden method ....
200 if ($super->isa('Moose::Meta::Method::Overriden')) {
201 # we need to be sure that we actually
202 # find the next method, which is not
203 # an 'override' method, the reason is
204 # that an 'override' method will not
205 # be the one calling inner()
206 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
207 $_super_package = $real_super->package_name;
209 $self->add_method($name => sub {
212 no warnings 'redefine';
213 local *{$_super_package . '::inner'} = sub { $method->(@args) };
214 return $super->(@args);
218 ## Private Utility methods ...
220 sub _find_next_method_by_name_which_is_not_overridden {
221 my ($self, $name) = @_;
222 foreach my $method ($self->find_all_methods_by_name($name)) {
223 return $method->{code}
224 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
229 sub _fix_metaclass_incompatability {
230 my ($self, @superclasses) = @_;
231 foreach my $super (@superclasses) {
232 # don't bother if it does not have a meta.
233 next unless $super->can('meta');
234 # if it's meta is a vanilla Moose,
235 # then we can safely ignore it.
236 next if blessed($super->meta) eq 'Moose::Meta::Class';
237 # but if we have anything else,
238 # we need to check it out ...
239 unless (# see if of our metaclass is incompatible
240 ($self->isa(blessed($super->meta)) &&
241 # and see if our instance metaclass is incompatible
242 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
243 # ... and if we are just a vanilla Moose
244 $self->isa('Moose::Meta::Class')) {
245 # re-initialize the meta ...
246 my $super_meta = $super->meta;
248 # We might want to consider actually
249 # transfering any attributes from the
250 # original meta into this one, but in
251 # general you should not have any there
252 # at this point anyway, so it's very
253 # much an obscure edge case anyway
254 $self = $super_meta->reinitialize($self->name => (
255 ':attribute_metaclass' => $super_meta->attribute_metaclass,
256 ':method_metaclass' => $super_meta->method_metaclass,
257 ':instance_metaclass' => $super_meta->instance_metaclass,
264 sub _apply_all_roles {
265 my ($self, @roles) = @_;
266 ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
267 || confess "You can only consume roles, $_ is not a Moose role"
269 if (scalar @roles == 1) {
270 $roles[0]->meta->apply($self);
274 # we should make a Moose::Meta::Role::Composite
275 # which is a smaller version of Moose::Meta::Role
276 # which does not use any package stuff
277 Moose::Meta::Role->combine(
278 map { $_->meta } @roles
283 sub _process_attribute {
284 my ($self, $name, %options) = @_;
285 if ($name =~ /^\+(.*)/) {
286 my $new_attr = $self->_process_inherited_attribute($1, %options);
287 $self->add_attribute($new_attr);
290 if ($options{metaclass}) {
291 Moose::_load_all_classes($options{metaclass});
292 $self->add_attribute($options{metaclass}->new($name, %options));
295 $self->add_attribute($name, %options);
300 sub _process_inherited_attribute {
301 my ($self, $attr_name, %options) = @_;
302 my $inherited_attr = $self->find_attribute_by_name($attr_name);
303 (defined $inherited_attr)
304 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
306 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
307 $new_attr = $inherited_attr->clone_and_inherit_options(%options);
311 # kind of a kludge to handle Class::MOP::Attributes
312 $new_attr = Moose::Meta::Attribute::clone_and_inherit_options(
313 $inherited_attr, %options
327 Moose::Meta::Class - The Moose metaclass
331 This is a subclass of L<Class::MOP::Class> with Moose specific
334 For the most part, the only time you will ever encounter an
335 instance of this class is if you are doing some serious deep
336 introspection. To really understand this class, you need to refer
337 to the L<Class::MOP::Class> documentation.
347 We override this method to support the C<trigger> attribute option.
349 =item B<construct_instance>
351 This provides some Moose specific extensions to this method, you
352 almost never call this method directly unless you really know what
355 This method makes sure to handle the moose weak-ref, type-constraint
356 and type coercion features.
358 =item B<get_method_map>
360 This accommodates Moose::Meta::Role::Method instances, which are
361 aliased, instead of added, but still need to be counted as valid
364 =item B<add_override_method_modifier ($name, $method)>
366 This will create an C<override> method modifier for you, and install
369 =item B<add_augment_method_modifier ($name, $method)>
371 This will create an C<augment> method modifier for you, and install
374 =item B<calculate_all_roles>
378 This will return an array of C<Moose::Meta::Role> instances which are
379 attached to this class.
381 =item B<add_role ($role)>
383 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
384 to the list of associated roles.
386 =item B<does_role ($role_name)>
388 This will test if this class C<does> a given C<$role_name>. It will
389 not only check it's local roles, but ask them as well in order to
390 cascade down the role hierarchy.
392 =item B<excludes_role ($role_name)>
394 This will test if this class C<excludes> a given C<$role_name>. It will
395 not only check it's local roles, but ask them as well in order to
396 cascade down the role hierarchy.
398 =item B<add_attribute ($attr_name, %params|$params)>
400 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
401 support for taking the C<$params> as a HASH ref.
407 All complex software has bugs lurking in it, and this module is no
408 exception. If you find a bug please either email me, or add the bug
413 Stevan Little E<lt>stevan@iinteractive.comE<gt>
415 =head1 COPYRIGHT AND LICENSE
417 Copyright 2006 by Infinity Interactive, Inc.
419 L<http://www.iinteractive.com>
421 This library is free software; you can redistribute it and/or modify
422 it under the same terms as Perl itself.