2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.18';
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' => $super_meta->instance_metaclass,
271 # this was crap anyway, see
272 # Moose::Util::apply_all_roles
274 sub _apply_all_roles {
275 die 'DEPRECATED: use Moose::Util::apply_all_roles($meta, @roles) instead'
280 sub _process_attribute {
283 my %options = ((scalar @_ == 1 && ref($_[0]) eq 'HASH') ? %{$_[0]} : @_);
285 if ($name =~ /^\+(.*)/) {
286 return $self->_process_inherited_attribute($1, %options);
289 my $attr_metaclass_name;
290 if ($options{metaclass}) {
291 my $metaclass_name = $options{metaclass};
293 my $possible_full_name = 'Moose::Meta::Attribute::Custom::' . $metaclass_name;
294 Class::MOP::load_class($possible_full_name);
295 $metaclass_name = $possible_full_name->can('register_implementation')
296 ? $possible_full_name->register_implementation
297 : $possible_full_name;
300 Class::MOP::load_class($metaclass_name);
302 $attr_metaclass_name = $metaclass_name;
305 $attr_metaclass_name = $self->attribute_metaclass;
308 if ($options{traits}) {
310 my $anon_role_key = join "|" => @{$options{traits}};
313 if (exists $ANON_CLASSES{$anon_role_key} && defined $ANON_CLASSES{$anon_role_key}) {
314 $class = $ANON_CLASSES{$anon_role_key};
317 $class = Moose::Meta::Class->create_anon_class(
318 superclasses => [ $attr_metaclass_name ]
320 $ANON_CLASSES{$anon_role_key} = $class;
323 foreach my $trait (@{$options{traits}}) {
325 my $possible_full_name = 'Moose::Meta::Attribute::Custom::Trait::' . $trait;
326 Class::MOP::load_class($possible_full_name);
327 push @traits => $possible_full_name->can('register_implementation')
328 ? $possible_full_name->register_implementation
329 : $possible_full_name;
332 push @traits => $trait;
336 Moose::Util::apply_all_roles($class, @traits);
339 $attr_metaclass_name = $class->name;
342 return $attr_metaclass_name->new($name, %options);
346 sub _process_inherited_attribute {
347 my ($self, $attr_name, %options) = @_;
348 my $inherited_attr = $self->find_attribute_by_name($attr_name);
349 (defined $inherited_attr)
350 || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
351 if ($inherited_attr->isa('Moose::Meta::Attribute')) {
352 return $inherited_attr->clone_and_inherit_options(%options);
356 # kind of a kludge to handle Class::MOP::Attributes
357 return $inherited_attr->Moose::Meta::Attribute::clone_and_inherit_options(%options);
361 ## -------------------------------------------------
363 use Moose::Meta::Method::Constructor;
364 use Moose::Meta::Method::Destructor;
366 # This could be done by using SUPER and altering ->options
367 # I am keeping it this way to make it more explicit.
368 sub create_immutable_transformer {
370 my $class = Class::MOP::Immutable->new($self, {
371 read_only => [qw/superclasses/],
379 remove_package_symbol
383 class_precedence_list => 'ARRAY',
384 compute_all_applicable_attributes => 'ARRAY',
385 get_meta_instance => 'SCALAR',
386 get_method_map => 'SCALAR',
388 calculate_all_roles => 'ARRAY',
396 $self->SUPER::make_immutable
398 constructor_class => 'Moose::Meta::Method::Constructor',
399 destructor_class => 'Moose::Meta::Method::Destructor',
400 inline_destructor => 1,
402 # no need to do this,
403 # Moose always does it
404 inline_accessors => 0,
417 Moose::Meta::Class - The Moose metaclass
421 This is a subclass of L<Class::MOP::Class> with Moose specific
424 For the most part, the only time you will ever encounter an
425 instance of this class is if you are doing some serious deep
426 introspection. To really understand this class, you need to refer
427 to the L<Class::MOP::Class> documentation.
435 =item B<make_immutable>
437 Override original to add default options for inlining destructor
438 and altering the Constructor metaclass.
440 =item B<create_immutable_transformer>
442 Override original to lock C<add_role> and memoize C<calculate_all_roles>
446 We override this method to support the C<trigger> attribute option.
448 =item B<construct_instance>
450 This provides some Moose specific extensions to this method, you
451 almost never call this method directly unless you really know what
454 This method makes sure to handle the moose weak-ref, type-constraint
455 and type coercion features.
457 =item B<get_method_map>
459 This accommodates Moose::Meta::Role::Method instances, which are
460 aliased, instead of added, but still need to be counted as valid
463 =item B<add_override_method_modifier ($name, $method)>
465 This will create an C<override> method modifier for you, and install
468 =item B<add_augment_method_modifier ($name, $method)>
470 This will create an C<augment> method modifier for you, and install
473 =item B<calculate_all_roles>
477 This will return an array of C<Moose::Meta::Role> instances which are
478 attached to this class.
480 =item B<add_role ($role)>
482 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
483 to the list of associated roles.
485 =item B<does_role ($role_name)>
487 This will test if this class C<does> a given C<$role_name>. It will
488 not only check it's local roles, but ask them as well in order to
489 cascade down the role hierarchy.
491 =item B<excludes_role ($role_name)>
493 This will test if this class C<excludes> a given C<$role_name>. It will
494 not only check it's local roles, but ask them as well in order to
495 cascade down the role hierarchy.
497 =item B<add_attribute ($attr_name, %params|$params)>
499 This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
500 support for taking the C<$params> as a HASH ref.
506 All complex software has bugs lurking in it, and this module is no
507 exception. If you find a bug please either email me, or add the bug
512 Stevan Little E<lt>stevan@iinteractive.comE<gt>
514 =head1 COPYRIGHT AND LICENSE
516 Copyright 2006-2008 by Infinity Interactive, Inc.
518 L<http://www.iinteractive.com>
520 This library is free software; you can redistribute it and/or modify
521 it under the same terms as Perl itself.