2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.17';
13 our $AUTHORITY = 'cpan:STEVAN';
15 use Moose::Meta::Method::Overriden;
17 use base 'Class::MOP::Class';
19 __PACKAGE__->meta->add_attribute('roles' => (
27 $class->SUPER::initialize($pkg,
28 'attribute_metaclass' => 'Moose::Meta::Attribute',
29 'method_metaclass' => 'Moose::Meta::Method',
30 'instance_metaclass' => 'Moose::Meta::Instance',
35 my ($self, $role) = @_;
36 (blessed($role) && $role->isa('Moose::Meta::Role'))
37 || confess "Roles must be instances of Moose::Meta::Role";
38 push @{$self->roles} => $role;
41 sub calculate_all_roles {
44 grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles };
48 my ($self, $role_name) = @_;
50 || confess "You must supply a role name to look for";
51 foreach my $class ($self->class_precedence_list) {
52 next unless $class->can('meta');
53 foreach my $role (@{$class->meta->roles}) {
54 return 1 if $role->does_role($role_name);
61 my ($self, $role_name) = @_;
63 || confess "You must supply a role name to look for";
64 foreach my $class ($self->class_precedence_list) {
65 next unless $class->can('meta');
67 # in the pretty rare instance when a Moose metaclass
68 # is itself extended with a role, this check needs to
69 # be done since some items in the class_precedence_list
70 # might in fact be Class::MOP based still.
71 next unless $class->meta->can('roles');
72 foreach my $role (@{$class->meta->roles}) {
73 return 1 if $role->excludes_role($role_name);
80 my ($class, %params) = @_;
81 my $self = $class->SUPER::new_object(%params);
82 foreach my $attr ($class->compute_all_applicable_attributes()) {
84 # this does not accept undefined
85 # values, nor does it accept false
86 # values to be passed into the init-arg
87 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
88 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
93 sub construct_instance {
94 my ($class, %params) = @_;
95 my $meta_instance = $class->get_meta_instance;
97 # the code below is almost certainly incorrect
98 # but this is foreign inheritence, so we might
99 # have to kludge it in the end.
100 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
101 foreach my $attr ($class->compute_all_applicable_attributes()) {
102 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
112 if (defined $self->{'$!_package_cache_flag'} &&
113 $self->{'$!_package_cache_flag'} == Class::MOP::check_package_cache_flag($self->meta->name)) {
114 return $self->{'%!methods'};
117 my $map = $self->{'%!methods'};
119 my $class_name = $self->name;
120 my $method_metaclass = $self->method_metaclass;
122 foreach my $symbol ($self->list_all_package_symbols('CODE')) {
124 my $code = $self->get_package_symbol('&' . $symbol);
126 next if exists $map->{$symbol} &&
127 defined $map->{$symbol} &&
128 $map->{$symbol}->body == $code;
130 my ($pkg, $name) = Class::MOP::get_code_info($code);
132 if ($pkg->can('meta')
134 # we don't know what ->meta we are calling
135 # here, so we need to be careful cause it
136 # just might blow up at us, or just complain
137 # loudly (in the case of Curses.pm) so we
138 # just be a little overly cautious here.
140 && eval { no warnings; blessed($pkg->meta) }
141 && $pkg->meta->isa('Moose::Meta::Role')) {
142 #my $role = $pkg->meta->name;
143 #next unless $self->does_role($role);
146 next if ($pkg || '') ne $class_name &&
147 ($name || '') ne '__ANON__';
151 $map->{$symbol} = $method_metaclass->wrap($code);
157 ### ---------------------------------------------
161 $self->SUPER::add_attribute($self->_process_attribute(@_));
164 sub add_override_method_modifier {
165 my ($self, $name, $method, $_super_package) = @_;
166 (!$self->has_method($name))
167 || confess "Cannot add an override method if a local method is already present";
168 # need this for roles ...
169 $_super_package ||= $self->name;
170 my $super = $self->find_next_method_by_name($name);
172 || confess "You cannot override '$name' because it has no super method";
173 $self->add_method($name => Moose::Meta::Method::Overriden->wrap(sub {
175 no warnings 'redefine';
176 if ($Moose::SUPER_SLOT{$_super_package}) {
177 local *{$Moose::SUPER_SLOT{$_super_package}} = sub { $super->body->(@args) };
178 return $method->(@args);
180 confess "Trying to call override modifier'd method without super()";
185 sub add_augment_method_modifier {
186 my ($self, $name, $method) = @_;
187 (!$self->has_method($name))
188 || confess "Cannot add an augment method if a local method is already present";
189 my $super = $self->find_next_method_by_name($name);
191 || confess "You cannot augment '$name' because it has no super method";
192 my $_super_package = $super->package_name;
193 # BUT!,... if this is an overriden method ....
194 if ($super->isa('Moose::Meta::Method::Overriden')) {
195 # we need to be sure that we actually
196 # find the next method, which is not
197 # an 'override' method, the reason is
198 # that an 'override' method will not
199 # be the one calling inner()
200 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
201 $_super_package = $real_super->package_name;
203 $self->add_method($name => sub {
205 no warnings 'redefine';
206 if ($Moose::INNER_SLOT{$_super_package}) {
207 local *{$Moose::INNER_SLOT{$_super_package}} = sub {
208 local *{$Moose::INNER_SLOT{$_super_package}} = sub {};
211 return $super->body->(@args);
214 return $super->body->(@args);
219 ## Private Utility methods ...
221 sub _find_next_method_by_name_which_is_not_overridden {
222 my ($self, $name) = @_;
223 foreach my $method ($self->find_all_methods_by_name($name)) {
224 return $method->{code}
225 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
230 sub _fix_metaclass_incompatability {
231 my ($self, @superclasses) = @_;
232 foreach my $super (@superclasses) {
233 # don't bother if it does not have a meta.
234 next unless $super->can('meta');
235 # get the name, make sure we take
236 # immutable classes into account
237 my $super_meta_name = ($super->meta->is_immutable
238 ? $super->meta->get_mutable_metaclass_name
239 : blessed($super->meta));
240 # if it's meta is a vanilla Moose,
241 # then we can safely ignore it.
242 next if $super_meta_name eq 'Moose::Meta::Class';
243 # but if we have anything else,
244 # we need to check it out ...
245 unless (# see if of our metaclass is incompatible
246 ($self->isa($super_meta_name) &&
247 # and see if our instance metaclass is incompatible
248 $self->instance_metaclass->isa($super->meta->instance_metaclass)) &&
249 # ... and if we are just a vanilla Moose
250 $self->isa('Moose::Meta::Class')) {
251 # re-initialize the meta ...
252 my $super_meta = $super->meta;
254 # We might want to consider actually
255 # transfering any attributes from the
256 # original meta into this one, but in
257 # general you should not have any there
258 # at this point anyway, so it's very
259 # much an obscure edge case anyway
260 $self = $super_meta->reinitialize($self->name => (
261 'attribute_metaclass' => $super_meta->attribute_metaclass,
262 'method_metaclass' => $super_meta->method_metaclass,
263 'instance_metaclass' => $super_meta->instance_metaclass,
271 # this was crap anyway, see
272 # Moose::Util::apply_all_roles
274 sub _apply_all_roles { die "DEPRECATED" }
278 sub _process_attribute {
281 my %options = ((scalar @_ == 1 && ref($_[0]) eq 'HASH') ? %{$_[0]} : @_);
283 if ($name =~ /^\+(.*)/) {
284 return $self->_process_inherited_attribute($1, %options);
287 my $attr_metaclass_name;
288 if ($options{metaclass}) {
289 my $metaclass_name = $options{metaclass};
291 my $possible_full_name = 'Moose::Meta::Attribute::Custom::' . $metaclass_name;
292 Class::MOP::load_class($possible_full_name);
293 $metaclass_name = $possible_full_name->can('register_implementation')
294 ? $possible_full_name->register_implementation
295 : $possible_full_name;
298 Class::MOP::load_class($metaclass_name);
300 $attr_metaclass_name = $metaclass_name;
303 $attr_metaclass_name = $self->attribute_metaclass;
306 if ($options{traits}) {
308 my $anon_role_key = join "|" => @{$options{traits}};
311 if (exists $ANON_CLASSES{$anon_role_key} && defined $ANON_CLASSES{$anon_role_key}) {
312 $class = $ANON_CLASSES{$anon_role_key};
315 $class = Moose::Meta::Class->create_anon_class(
316 superclasses => [ $attr_metaclass_name ]
318 $ANON_CLASSES{$anon_role_key} = $class;
319 Moose::Util::apply_all_roles($class, @{$options{traits}});
322 $attr_metaclass_name = $class->name;
325 return $attr_metaclass_name->new($name, %options);
329 sub _process_inherited_attribute {
330 my ($self, $attr_name, %options) = @_;
331 my $inherited_attr = $self->find_attribute_by_name($attr_name);
332 (defined $inherited_attr)
333 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
334 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
335 return $inherited_attr->clone_and_inherit_options(%options);
339 # kind of a kludge to handle Class::MOP::Attributes
340 return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options);
344 ## -------------------------------------------------
346 use Moose::Meta::Method::Constructor;
347 use Moose::Meta::Method::Destructor;
349 # This could be done by using SUPER and altering ->options
350 # I am keeping it this way to make it more explicit.
351 sub create_immutable_transformer {
353 my $class = Class::MOP::Immutable->new($self, {
354 read_only => [qw/superclasses/],
362 remove_package_symbol
366 class_precedence_list => 'ARRAY',
367 compute_all_applicable_attributes => 'ARRAY',
368 get_meta_instance => 'SCALAR',
369 get_method_map => 'SCALAR',
371 calculate_all_roles => 'ARRAY',
379 $self->SUPER::make_immutable
381 constructor_class => 'Moose::Meta::Method::Constructor',
382 destructor_class => 'Moose::Meta::Method::Destructor',
383 inline_destructor => 1,
385 # no need to do this,
386 # Moose always does it
387 inline_accessors => 0,
400 Moose::Meta::Class - The Moose metaclass
404 This is a subclass of L<Class::MOP::Class> with Moose specific
407 For the most part, the only time you will ever encounter an
408 instance of this class is if you are doing some serious deep
409 introspection. To really understand this class, you need to refer
410 to the L<Class::MOP::Class> documentation.
418 =item B<make_immutable>
420 Override original to add default options for inlining destructor
421 and altering the Constructor metaclass.
423 =item B<create_immutable_transformer>
425 Override original to lock C<add_role> and memoize C<calculate_all_roles>
429 We override this method to support the C<trigger> attribute option.
431 =item B<construct_instance>
433 This provides some Moose specific extensions to this method, you
434 almost never call this method directly unless you really know what
437 This method makes sure to handle the moose weak-ref, type-constraint
438 and type coercion features.
440 =item B<get_method_map>
442 This accommodates Moose::Meta::Role::Method instances, which are
443 aliased, instead of added, but still need to be counted as valid
446 =item B<add_override_method_modifier ($name, $method)>
448 This will create an C<override> method modifier for you, and install
451 =item B<add_augment_method_modifier ($name, $method)>
453 This will create an C<augment> method modifier for you, and install
456 =item B<calculate_all_roles>
460 This will return an array of C<Moose::Meta::Role> instances which are
461 attached to this class.
463 =item B<add_role ($role)>
465 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
466 to the list of associated roles.
468 =item B<does_role ($role_name)>
470 This will test if this class C<does> a given C<$role_name>. It will
471 not only check it's local roles, but ask them as well in order to
472 cascade down the role hierarchy.
474 =item B<excludes_role ($role_name)>
476 This will test if this class C<excludes> a given C<$role_name>. It will
477 not only check it's local roles, but ask them as well in order to
478 cascade down the role hierarchy.
480 =item B<add_attribute ($attr_name, %params|$params)>
482 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
483 support for taking the C<$params> as a HASH ref.
489 All complex software has bugs lurking in it, and this module is no
490 exception. If you find a bug please either email me, or add the bug
495 Stevan Little E<lt>stevan@iinteractive.comE<gt>
497 =head1 COPYRIGHT AND LICENSE
499 Copyright 2006-2008 by Infinity Interactive, Inc.
501 L<http://www.iinteractive.com>
503 This library is free software; you can redistribute it and/or modify
504 it under the same terms as Perl itself.