1 package Mouse::Meta::Class;
5 use Mouse::Meta::Method::Constructor;
6 use Mouse::Meta::Method::Destructor;
7 use Scalar::Util qw/blessed/;
8 use Mouse::Util qw/get_linear_isa/;
14 # because Mouse doesn't introspect existing classes, we're forced to
15 # only pay attention to other Mouse classes
16 sub _metaclass_cache {
19 return $METACLASS_CACHE{$name};
25 $METACLASS_CACHE{$name} = $class->new(name => $name)
26 if !exists($METACLASS_CACHE{$name});
27 return $METACLASS_CACHE{$name};
35 $args{attributes} = {};
36 $args{superclasses} = do {
38 \@{ $args{name} . '::ISA' };
45 sub name { $_[0]->{name} }
51 Mouse::load_class($_) for @_;
52 @{ $self->{superclasses} } = @_;
55 @{ $self->{superclasses} };
63 my $pkg = $self->name;
66 no warnings 'redefine';
67 $self->{'methods'}->{$name}++; # Moose stores meta object here.
68 *{ $pkg . '::' . $name } = $code;
71 # copied from Class::Inspector
72 my $get_methods_for_class = sub {
77 # Get all the CODE symbol table entries
79 grep !/^(?:has|with|around|before|after|blessed|extends|confess|override|super)$/,
80 grep { defined &{"${name}::$_"} }
82 push @functions, keys %{$self->{'methods'}->{$name}} if $self;
83 wantarray ? @functions : \@functions;
88 $get_methods_for_class->($self, $self->name);
95 $self->{'attributes'}{$attr->name} = $attr;
98 sub compute_all_applicable_attributes {
102 for my $class ($self->linearized_isa) {
103 my $meta = $self->_metaclass_cache($class)
106 for my $name (keys %{ $meta->get_attribute_map }) {
107 next if $seen{$name}++;
108 push @attr, $meta->get_attribute($name);
115 sub get_attribute_map { $_[0]->{attributes} }
116 sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
117 sub get_attribute { $_[0]->{attributes}->{$_[1]} }
119 sub linearized_isa { @{ get_linear_isa($_[0]->name) } }
123 my $instance = shift;
125 (blessed($instance) && $instance->isa($class->name))
126 || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)";
128 $class->clone_instance($instance, @_);
132 my ($class, $instance, %params) = @_;
135 || confess "You can only clone instances, ($instance) is not a blessed instance";
137 my $clone = bless { %$instance }, ref $instance;
139 foreach my $attr ($class->compute_all_applicable_attributes()) {
140 if ( defined( my $init_arg = $attr->init_arg ) ) {
141 if (exists $params{$init_arg}) {
142 $clone->{ $attr->name } = $params{$init_arg};
154 inline_constructor => 1,
158 my $name = $self->name;
159 $self->{is_immutable}++;
161 if ($args{inline_constructor}) {
162 $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self ));
165 if ($args{inline_destructor}) {
166 $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self ));
170 sub make_mutable { confess "Mouse does not currently support 'make_mutable'" }
172 sub is_immutable { $_[0]->{is_immutable} }
174 sub attribute_metaclass { "Mouse::Meta::Class" }
176 sub _install_modifier {
177 my ( $self, $into, $type, $name, $code ) = @_;
178 if (eval "require Class::Method::Modifiers::Fast; 1") {
179 Class::Method::Modifiers::Fast::_install_modifier(
187 require Class::Method::Modifiers;
188 Class::Method::Modifiers::_install_modifier(
197 sub add_before_method_modifier {
198 my ( $self, $name, $code ) = @_;
199 $self->_install_modifier( $self->name, 'before', $name, $code );
202 sub add_around_method_modifier {
203 my ( $self, $name, $code ) = @_;
204 $self->_install_modifier( $self->name, 'around', $name, $code );
207 sub add_after_method_modifier {
208 my ( $self, $name, $code ) = @_;
209 $self->_install_modifier( $self->name, 'after', $name, $code );
212 sub roles { $_[0]->{roles} }
215 my ($self, $role_name) = @_;
218 || confess "You must supply a role name to look for";
220 for my $role (@{ $self->{roles} }) {
221 return 1 if $role->name eq $role_name;
228 my ($self, $package_name, %options) = @_;
230 (ref $options{superclasses} eq 'ARRAY')
231 || confess "You must pass an ARRAY ref of superclasses"
232 if exists $options{superclasses};
234 (ref $options{attributes} eq 'ARRAY')
235 || confess "You must pass an ARRAY ref of attributes"
236 if exists $options{attributes};
238 (ref $options{methods} eq 'HASH')
239 || confess "You must pass a HASH ref of methods"
240 if exists $options{methods};
243 ( defined $package_name && $package_name )
244 || confess "You must pass a package name";
246 my $code = "package $package_name;";
247 $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';"
248 if exists $options{version};
249 $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';"
250 if exists $options{authority};
253 confess "creation of $package_name failed : $@" if $@;
256 my %initialize_options = %options;
257 delete @initialize_options{qw(
265 my $meta = $self->initialize( $package_name => %initialize_options );
268 $meta->add_method('meta' => sub {
269 $self->initialize(ref($_[0]) || $_[0]);
272 $meta->superclasses(@{$options{superclasses}})
273 if exists $options{superclasses};
275 # process attributes first, so that they can
276 # install accessors, but locally defined methods
277 # can then overwrite them. It is maybe a little odd, but
278 # I think this should be the order of things.
279 if (exists $options{attributes}) {
280 foreach my $attr (@{$options{attributes}}) {
281 Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr);
284 if (exists $options{methods}) {
285 foreach my $method_name (keys %{$options{methods}}) {
286 $meta->add_method($method_name, $options{methods}->{$method_name});
293 my $ANON_CLASS_SERIAL = 0;
294 my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::';
295 sub create_anon_class {
296 my ( $class, %options ) = @_;
297 my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL;
298 return $class->create( $package_name, %options );
308 Mouse::Meta::Class - hook into the Mouse MOP
312 =head2 initialize ClassName -> Mouse::Meta::Class
314 Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only
315 one instance should exist for a given class.
317 =head2 new %args -> Mouse::Meta::Class
319 Creates a new Mouse::Meta::Class. Don't call this directly.
321 =head2 name -> ClassName
323 Returns the name of the owner class.
325 =head2 superclasses -> [ClassName]
327 Gets (or sets) the list of superclasses of the owner class.
329 =head2 add_attribute Mouse::Meta::Attribute
331 Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
334 =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
336 Returns the list of all L<Mouse::Meta::Attribute> instances associated with
337 this class and its superclasses.
339 =head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
341 Returns a mapping of attribute names to their corresponding
342 L<Mouse::Meta::Attribute> objects.
344 =head2 has_attribute Name -> Bool
346 Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
348 =head2 get_attribute Name -> Mouse::Meta::Attribute | undef
350 Returns the L<Mouse::Meta::Attribute> with the given name.
352 =head2 linearized_isa -> [ClassNames]
354 Returns the list of classes in method dispatch order, with duplicates removed.
356 =head2 clone_object Instance -> Instance
358 Clones the given C<Instance> which must be an instance governed by this
361 =head2 clone_instance Instance, Parameters -> Instance
363 Clones the given C<Instance> and sets any additional parameters.