2 package Mouse::Meta::Class;
6 use Mouse::Meta::Method::Constructor;
7 use Mouse::Meta::Method::Destructor;
8 use Mouse::Util qw/get_linear_isa blessed/;
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 *{ $pkg . '::' . $name } = $code;
69 # copied from Class::Inspector
72 my $name = $self->name;
75 # Get all the CODE symbol table entries
76 my @functions = grep !/^meta$/,
77 grep { /\A[^\W\d]\w*\z/o }
78 grep { defined &{"${name}::$_"} }
80 wantarray ? @functions : \@functions;
87 $self->{'attributes'}{$attr->name} = $attr;
90 sub compute_all_applicable_attributes {
94 for my $class ($self->linearized_isa) {
95 my $meta = $self->_metaclass_cache($class)
98 for my $name (keys %{ $meta->get_attribute_map }) {
99 next if $seen{$name}++;
100 push @attr, $meta->get_attribute($name);
107 sub get_attribute_map { $_[0]->{attributes} }
108 sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
109 sub get_attribute { $_[0]->{attributes}->{$_[1]} }
111 sub linearized_isa { @{ get_linear_isa($_[0]->name) } }
115 my $instance = shift;
117 (blessed($instance) && $instance->isa($class->name))
118 || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)";
120 $class->clone_instance($instance, @_);
124 my ($class, $instance, %params) = @_;
127 || confess "You can only clone instances, ($instance) is not a blessed instance";
129 my $clone = bless { %$instance }, ref $instance;
131 foreach my $attr ($class->compute_all_applicable_attributes()) {
132 if ( defined( my $init_arg = $attr->init_arg ) ) {
133 if (exists $params{$init_arg}) {
134 $clone->{ $attr->name } = $params{$init_arg};
145 my $name = $self->name;
146 $self->{is_immutable}++;
148 *{"$name\::new"} = Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self );
149 *{"$name\::DESTROY"} = Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self );
152 Carp::croak "Mouse::Meta::Class->make_mutable does not supported by Mouse";
154 sub is_immutable { $_[0]->{is_immutable} }
156 sub attribute_metaclass { "Mouse::Meta::Class" }
158 sub add_before_method_modifier {
159 my ($self, $name, $code) = @_;
160 require Class::Method::Modifiers;
161 Class::Method::Modifiers::_install_modifier(
169 sub add_around_method_modifier {
170 my ($self, $name, $code) = @_;
171 require Class::Method::Modifiers;
172 Class::Method::Modifiers::_install_modifier(
180 sub add_after_method_modifier {
181 my ($self, $name, $code) = @_;
182 require Class::Method::Modifiers;
183 Class::Method::Modifiers::_install_modifier(
191 sub roles { $_[0]->{roles} }
194 my ($self, $role_name) = @_;
196 || confess "You must supply a role name to look for";
197 for my $role (@{ $self->{roles} }) {
198 return 1 if $role->name eq $role_name;
204 my ( $class, @args ) = @_;
206 unshift @args, 'package' if @args % 2 == 1;
208 my (%options) = @args;
209 my $package_name = $options{package};
211 (ref $options{superclasses} eq 'ARRAY')
212 || confess "You must pass an ARRAY ref of superclasses"
213 if exists $options{superclasses};
215 (ref $options{attributes} eq 'ARRAY')
216 || confess "You must pass an ARRAY ref of attributes"
217 if exists $options{attributes};
219 (ref $options{methods} eq 'HASH')
220 || confess "You must pass a HASH ref of methods"
221 if exists $options{methods};
224 # XXX should I implement Mouse::Meta::Module?
225 my $package_name = $options{package};
227 ( defined $package_name && $package_name )
228 || confess "You must pass a package name";
230 my $code = "package $package_name;";
231 $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';"
232 if exists $options{version};
233 $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';"
234 if exists $options{authority};
237 confess "creation of $package_name failed : $@" if $@;
240 my (%initialize_options) = @args;
241 delete @initialize_options{qw(
249 my $meta = $class->initialize( $package_name => %initialize_options );
252 $meta->add_method('meta' => sub {
253 $class->initialize(ref($_[0]) || $_[0]);
256 $meta->superclasses(@{$options{superclasses}})
257 if exists $options{superclasses};
259 # process attributes first, so that they can
260 # install accessors, but locally defined methods
261 # can then overwrite them. It is maybe a little odd, but
262 # I think this should be the order of things.
263 if (exists $options{attributes}) {
264 foreach my $attr (@{$options{attributes}}) {
265 Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr);
268 if (exists $options{methods}) {
269 foreach my $method_name (keys %{$options{methods}}) {
270 $meta->add_method($method_name, $options{methods}->{$method_name});
277 my $ANON_CLASS_SERIAL = 0;
278 my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::';
279 sub create_anon_class {
280 my ( $class, %options ) = @_;
281 my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL;
282 return $class->create( $package_name, %options );
292 Mouse::Meta::Class - hook into the Mouse MOP
296 =head2 initialize ClassName -> Mouse::Meta::Class
298 Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only
299 one instance should exist for a given class.
301 =head2 new %args -> Mouse::Meta::Class
303 Creates a new Mouse::Meta::Class. Don't call this directly.
305 =head2 name -> ClassName
307 Returns the name of the owner class.
309 =head2 superclasses -> [ClassName]
311 Gets (or sets) the list of superclasses of the owner class.
313 =head2 add_attribute Mouse::Meta::Attribute
315 Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
318 =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
320 Returns the list of all L<Mouse::Meta::Attribute> instances associated with
321 this class and its superclasses.
323 =head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
325 Returns a mapping of attribute names to their corresponding
326 L<Mouse::Meta::Attribute> objects.
328 =head2 has_attribute Name -> Boool
330 Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
332 =head2 get_attribute Name -> Mouse::Meta::Attribute | undef
334 Returns the L<Mouse::Meta::Attribute> with the given name.
336 =head2 linearized_isa -> [ClassNames]
338 Returns the list of classes in method dispatch order, with duplicates removed.
340 =head2 clone_object Instance -> Instance
342 Clones the given C<Instance> which must be an instance governed by this
345 =head2 clone_instance Instance, Parameters -> Instance
347 Clones the given C<Instance> and sets any additional parameters.