1 package Mouse::Meta::Class;
5 use Scalar::Util qw/blessed weaken/;
7 use Mouse::Util qw/:meta get_linear_isa not_supported/;
9 use Mouse::Meta::Method::Constructor;
10 use Mouse::Meta::Method::Destructor;
11 use Mouse::Meta::Module;
12 our @ISA = qw(Mouse::Meta::Module);
14 sub method_metaclass() { 'Mouse::Meta::Method' }
15 sub attribute_metaclass() { 'Mouse::Meta::Attribute' }
18 my($class, %args) = @_;
20 $args{attributes} ||= {};
21 $args{methods} ||= {};
24 $args{superclasses} = do {
26 \@{ $args{package} . '::ISA' };
29 my $self = bless \%args, ref($class) || $class;
30 if(ref($self) ne __PACKAGE__){
31 $self->meta->_initialize_object($self, \%args);
36 sub create_anon_class{
38 return $self->create(undef, @_);
42 return exists $_[0]->{anon_serial_id};
45 sub roles { $_[0]->{roles} }
51 Mouse::load_class($_) for @_;
52 @{ $self->{superclasses} } = @_;
55 return @{ $self->{superclasses} };
58 sub find_method_by_name{
59 my($self, $method_name) = @_;
61 or $self->throw_error('You must define a method name to find');
62 foreach my $class( $self->linearized_isa ){
63 my $method = $self->initialize($class)->get_method($method_name);
64 return $method if defined $method;
71 return map{ $self->find_method_by_name($_) } $self->get_all_method_names;
74 sub get_all_method_names {
77 return grep { $uniq{$_}++ == 0 }
78 map { Mouse::Meta::Class->initialize($_)->get_method_list() }
79 $self->linearized_isa;
90 $attr->isa('Mouse::Meta::Attribute')
91 || $self->throw_error("Your attribute must be an instance of Mouse::Meta::Attribute (or a subclass)");
99 my %args = (@_ == 1) ? %{$_[0]} : @_;
102 or $self->throw_error('You must provide a name for the attribute');
104 if ($name =~ s/^\+//) { # inherited attributes
107 foreach my $class($self->linearized_isa){
108 my $meta = Mouse::Util::get_metaclass_by_name($class) or next;
109 $inherited_attr = $meta->get_attribute($name) and last;
112 defined($inherited_attr)
113 or $self->throw_error("Could not find an attribute by the name of '$name' to inherit from in ".$self->name);
115 $attr = $inherited_attr->clone_and_inherit_options($name, \%args);
118 my($attribute_class, @traits) = $self->attribute_metaclass->interpolate_class($name, \%args);
119 $args{traits} = \@traits if @traits;
121 $attr = $attribute_class->new($name, %args);
125 weaken( $attr->{associated_class} = $self );
127 $self->{attributes}{$attr->name} = $attr;
128 $attr->install_accessors();
130 if(_MOUSE_VERBOSE && !$attr->{associated_methods} && ($attr->{is} || '') ne 'bare'){
131 Carp::cluck(qq{Attribute (}.$attr->name.qq{) of class }.$self->name.qq{ has no associated methods (did you mean to provide an "is" argument?)});
136 sub compute_all_applicable_attributes {
137 Carp::cluck('compute_all_applicable_attributes() has been deprecated');
138 return shift->get_all_attributes(@_)
141 sub get_all_attributes {
145 for my $class ($self->linearized_isa) {
146 my $meta = Mouse::Util::get_metaclass_by_name($class)
149 for my $name ($meta->get_attribute_list) {
150 next if $seen{$name}++;
151 push @attr, $meta->get_attribute($name);
158 sub linearized_isa { @{ get_linear_isa($_[0]->name) } }
162 my %args = (@_ == 1 ? %{$_[0]} : @_);
164 my $object = bless {}, $self->name;
166 $self->_initialize_object($object, \%args);
170 sub _initialize_object{
171 my($self, $object, $args) = @_;
175 foreach my $attribute ($self->get_all_attributes) {
176 my $from = $attribute->init_arg;
177 my $key = $attribute->name;
179 if (defined($from) && exists($args->{$from})) {
180 $object->{$key} = $attribute->_coerce_and_verify($args->{$from});
182 weaken($object->{$key})
183 if ref($object->{$key}) && $attribute->is_weak_ref;
185 if ($attribute->has_trigger) {
186 push @triggers_queue, [ $attribute->trigger, $object->{$key} ];
190 if ($attribute->has_default || $attribute->has_builder) {
191 unless ($attribute->is_lazy) {
192 my $default = $attribute->default;
193 my $builder = $attribute->builder;
194 my $value = $builder ? $object->$builder()
195 : ref($default) eq 'CODE' ? $object->$default()
198 # XXX: we cannot use $attribute->set_value() because it invokes triggers.
199 $object->{$key} = $attribute->_coerce_and_verify($value, $object);;
201 weaken($object->{$key})
202 if ref($object->{$key}) && $attribute->is_weak_ref;
206 if ($attribute->is_required) {
207 $self->throw_error("Attribute (".$attribute->name.") is required");
213 foreach my $trigger_and_value(@triggers_queue){
214 my($trigger, $value) = @{$trigger_and_value};
215 $trigger->($object, $value);
218 if($self->is_anon_class){
219 $object->{__METACLASS__} = $self;
228 my %params = (@_ == 1) ? %{$_[0]} : @_;
230 (blessed($object) && $object->isa($class->name))
231 || $class->throw_error("You must pass an instance of the metaclass (" . $class->name . "), not ($object)");
233 my $cloned = bless { %$object }, ref $object;
234 $class->_initialize_object($cloned, \%params);
240 my ($class, $instance, %params) = @_;
242 Carp::cluck('clone_instance has been deprecated. Use clone_object instead')
244 return $class->clone_object($instance, %params);
250 inline_constructor => 1,
251 inline_destructor => 1,
252 constructor_name => 'new',
256 $self->{is_immutable}++;
258 if ($args{inline_constructor}) {
259 # generate and install
260 Mouse::Meta::Method::Constructor->_generate_constructor_method($self, \%args);
263 if ($args{inline_destructor}) {
264 # generate and install
265 Mouse::Meta::Method::Destructor->_generate_destructor_method($self, \%args);
268 # Moose's make_immutable returns true allowing calling code to skip setting an explicit true value
269 # at the end of a source file.
273 sub make_mutable { not_supported }
275 sub is_immutable { $_[0]->{is_immutable} }
276 sub is_mutable { !$_[0]->{is_immutable} }
278 sub _install_modifier_pp{
279 my( $self, $into, $type, $name, $code ) = @_;
281 my $original = $into->can($name)
282 or $self->throw_error("The method '$name' is not found in the inheritance hierarchy for class $into");
284 my $modifier_table = $self->{modifiers}{$name};
286 if(!$modifier_table){
287 my(@before, @after, @around, $cache, $modified);
292 for my $c (@before) { $c->(@_) }
294 if(wantarray){ # list context
295 my @rval = $cache->(@_);
297 for my $c(@after){ $c->(@_) }
300 elsif(defined wantarray){ # scalar context
301 my $rval = $cache->(@_);
303 for my $c(@after){ $c->(@_) }
309 for my $c(@after){ $c->(@_) }
314 $self->{modifiers}{$name} = $modifier_table = {
315 original => $original,
321 cache => \$cache, # cache for around modifiers
324 $self->add_method($name => $modified);
327 if($type eq 'before'){
328 unshift @{$modifier_table->{before}}, $code;
330 elsif($type eq 'after'){
331 push @{$modifier_table->{after}}, $code;
334 push @{$modifier_table->{around}}, $code;
336 my $next = ${ $modifier_table->{cache} };
337 ${ $modifier_table->{cache} } = sub{ $code->($next, @_) };
343 sub _install_modifier {
344 my ( $self, $into, $type, $name, $code ) = @_;
346 # load Class::Method::Modifiers first
347 my $no_cmm_fast = do{
349 eval q{ require Class::Method::Modifiers::Fast };
355 $impl = \&_install_modifier_pp;
358 my $install_modifier = Class::Method::Modifiers::Fast->can('_install_modifier');
360 my ( $self, $into, $type, $name, $code ) = @_;
367 $self->{methods}{$name}++; # register it to the method map
372 # replace this method itself :)
374 no warnings 'redefine';
375 *_install_modifier = $impl;
378 $self->$impl( $into, $type, $name, $code );
381 sub add_before_method_modifier {
382 my ( $self, $name, $code ) = @_;
383 $self->_install_modifier( $self->name, 'before', $name, $code );
386 sub add_around_method_modifier {
387 my ( $self, $name, $code ) = @_;
388 $self->_install_modifier( $self->name, 'around', $name, $code );
391 sub add_after_method_modifier {
392 my ( $self, $name, $code ) = @_;
393 $self->_install_modifier( $self->name, 'after', $name, $code );
396 sub add_override_method_modifier {
397 my ($self, $name, $code) = @_;
399 my $package = $self->name;
401 my $body = $package->can($name)
402 or $self->throw_error("You cannot override '$name' because it has no super method");
404 $self->add_method($name => sub { $code->($package, $body, @_) });
408 my ($self, $role_name) = @_;
411 || $self->throw_error("You must supply a role name to look for");
413 for my $class ($self->linearized_isa) {
414 my $meta = Mouse::Util::get_metaclass_by_name($class);
415 next unless $meta && $meta->can('roles');
417 for my $role (@{ $meta->roles }) {
419 return 1 if $role->does_role($role_name);
432 Mouse::Meta::Class - The Mouse class metaclass
436 =head2 C<< initialize(ClassName) -> Mouse::Meta::Class >>
438 Finds or creates a C<Mouse::Meta::Class> instance for the given ClassName. Only
439 one instance should exist for a given class.
441 =head2 C<< name -> ClassName >>
443 Returns the name of the owner class.
445 =head2 C<< superclasses -> ClassNames >> C<< superclass(ClassNames) >>
447 Gets (or sets) the list of superclasses of the owner class.
449 =head2 C<< add_method(name => CodeRef) >>
451 Adds a method to the owner class.
453 =head2 C<< has_method(name) -> Bool >>
455 Returns whether we have a method with the given name.
457 =head2 C<< get_method(name) -> Mouse::Meta::Method | undef >>
459 Returns a L<Mouse::Meta::Method> with the given name.
461 Note that you can also use C<< $metaclass->name->can($name) >> for a method body.
463 =head2 C<< get_method_list -> Names >>
465 Returns a list of method names which are defined in the local class.
466 If you want a list of all applicable methods for a class, use the
467 C<get_all_methods> method.
469 =head2 C<< get_all_methods -> (Mouse::Meta::Method) >>
471 Return the list of all L<Mouse::Meta::Method> instances associated with
472 the class and its superclasses.
474 =head2 C<< add_attribute(name => spec | Mouse::Meta::Attribute) >>
476 Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
479 =head2 C<< has_attribute(Name) -> Bool >>
481 Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
483 =head2 C<< get_attribute Name -> Mouse::Meta::Attribute | undef >>
485 Returns the L<Mouse::Meta::Attribute> with the given name.
487 =head2 C<< get_attribute_list -> Names >>
489 Returns a list of attribute names which are defined in the local
490 class. If you want a list of all applicable attributes for a class,
491 use the C<get_all_attributes> method.
493 =head2 C<< get_all_attributes -> (Mouse::Meta::Attribute) >>
495 Returns the list of all L<Mouse::Meta::Attribute> instances associated with
496 this class and its superclasses.
498 =head2 C<< linearized_isa -> [ClassNames] >>
500 Returns the list of classes in method dispatch order, with duplicates removed.
502 =head2 C<< new_object(Parameters) -> Instance >>
504 Creates a new instance.
506 =head2 C<< clone_object(Instance, Parameters) -> Instance >>
508 Clones the given instance which must be an instance governed by this
511 =head2 C<< throw_error(Message, Parameters) >>
513 Throws an error with the given message.
517 L<Moose::Meta::Class>