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
74 my $name = $self->name;
77 # Get all the CODE symbol table entries
79 grep !/^(?:has|with|around|before|after|blessed|extends|confess)$/,
80 grep { defined &{"${name}::$_"} }
82 push @functions, keys %{$self->{'methods'}->{$name}};
83 wantarray ? @functions : \@functions;
90 $self->{'attributes'}{$attr->name} = $attr;
93 sub compute_all_applicable_attributes {
97 for my $class ($self->linearized_isa) {
98 my $meta = $self->_metaclass_cache($class)
101 for my $name (keys %{ $meta->get_attribute_map }) {
102 next if $seen{$name}++;
103 push @attr, $meta->get_attribute($name);
110 sub get_attribute_map { $_[0]->{attributes} }
111 sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
112 sub get_attribute { $_[0]->{attributes}->{$_[1]} }
114 sub linearized_isa { @{ get_linear_isa($_[0]->name) } }
118 my $instance = shift;
120 (blessed($instance) && $instance->isa($class->name))
121 || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)";
123 $class->clone_instance($instance, @_);
127 my ($class, $instance, %params) = @_;
130 || confess "You can only clone instances, ($instance) is not a blessed instance";
132 my $clone = bless { %$instance }, ref $instance;
134 foreach my $attr ($class->compute_all_applicable_attributes()) {
135 if ( defined( my $init_arg = $attr->init_arg ) ) {
136 if (exists $params{$init_arg}) {
137 $clone->{ $attr->name } = $params{$init_arg};
149 my $name = $self->name;
150 $self->{is_immutable}++;
151 $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self ));
152 if ($args{inline_destructor}) {
153 $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self ));
157 sub make_mutable { confess "Mouse does not currently support 'make_mutable'" }
159 sub is_immutable { $_[0]->{is_immutable} }
161 sub attribute_metaclass { "Mouse::Meta::Class" }
163 sub _install_fast_modifier {
169 foreach my $name (@_) {
170 my $method = Data::Util::get_code_ref( $into, $name );
172 if ( !$method || !Data::Util::subroutine_modifier($method) ) {
175 $method = $into->can($name)
176 or confess "The method '$name' is not found in the inheritance hierarchy for class $into";
178 $method = Data::Util::modify_subroutine( $method,
179 $type => [$modifier] );
181 no warnings 'redefine';
182 Data::Util::install_subroutine( $into, $name => $method );
185 Data::Util::subroutine_modifier( $method, $type => $modifier );
191 sub _install_modifier {
192 my ( $self, $into, $type, $name, $code ) = @_;
193 if (eval "require Data::Util; 1") {
194 $self->_install_fast_modifier(
202 require Class::Method::Modifiers;
203 Class::Method::Modifiers::_install_modifier(
212 sub add_before_method_modifier {
213 my ( $self, $name, $code ) = @_;
214 $self->_install_modifier( $self->name, 'before', $name, $code );
217 sub add_around_method_modifier {
218 my ( $self, $name, $code ) = @_;
219 $self->_install_modifier( $self->name, 'around', $name, $code );
222 sub add_after_method_modifier {
223 my ( $self, $name, $code ) = @_;
224 $self->_install_modifier( $self->name, 'after', $name, $code );
227 sub roles { $_[0]->{roles} }
230 my ($self, $role_name) = @_;
233 || confess "You must supply a role name to look for";
235 for my $role (@{ $self->{roles} }) {
236 return 1 if $role->name eq $role_name;
243 my ($self, $package_name, %options) = @_;
245 (ref $options{superclasses} eq 'ARRAY')
246 || confess "You must pass an ARRAY ref of superclasses"
247 if exists $options{superclasses};
249 (ref $options{attributes} eq 'ARRAY')
250 || confess "You must pass an ARRAY ref of attributes"
251 if exists $options{attributes};
253 (ref $options{methods} eq 'HASH')
254 || confess "You must pass a HASH ref of methods"
255 if exists $options{methods};
258 ( defined $package_name && $package_name )
259 || confess "You must pass a package name";
261 my $code = "package $package_name;";
262 $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';"
263 if exists $options{version};
264 $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';"
265 if exists $options{authority};
268 confess "creation of $package_name failed : $@" if $@;
271 my %initialize_options = %options;
272 delete @initialize_options{qw(
280 my $meta = $self->initialize( $package_name => %initialize_options );
283 $meta->add_method('meta' => sub {
284 $self->initialize(ref($_[0]) || $_[0]);
287 $meta->superclasses(@{$options{superclasses}})
288 if exists $options{superclasses};
290 # process attributes first, so that they can
291 # install accessors, but locally defined methods
292 # can then overwrite them. It is maybe a little odd, but
293 # I think this should be the order of things.
294 if (exists $options{attributes}) {
295 foreach my $attr (@{$options{attributes}}) {
296 Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr);
299 if (exists $options{methods}) {
300 foreach my $method_name (keys %{$options{methods}}) {
301 $meta->add_method($method_name, $options{methods}->{$method_name});
308 my $ANON_CLASS_SERIAL = 0;
309 my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::';
310 sub create_anon_class {
311 my ( $class, %options ) = @_;
312 my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL;
313 return $class->create( $package_name, %options );
323 Mouse::Meta::Class - hook into the Mouse MOP
327 =head2 initialize ClassName -> Mouse::Meta::Class
329 Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only
330 one instance should exist for a given class.
332 =head2 new %args -> Mouse::Meta::Class
334 Creates a new Mouse::Meta::Class. Don't call this directly.
336 =head2 name -> ClassName
338 Returns the name of the owner class.
340 =head2 superclasses -> [ClassName]
342 Gets (or sets) the list of superclasses of the owner class.
344 =head2 add_attribute Mouse::Meta::Attribute
346 Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
349 =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
351 Returns the list of all L<Mouse::Meta::Attribute> instances associated with
352 this class and its superclasses.
354 =head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
356 Returns a mapping of attribute names to their corresponding
357 L<Mouse::Meta::Attribute> objects.
359 =head2 has_attribute Name -> Bool
361 Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
363 =head2 get_attribute Name -> Mouse::Meta::Attribute | undef
365 Returns the L<Mouse::Meta::Attribute> with the given name.
367 =head2 linearized_isa -> [ClassNames]
369 Returns the list of classes in method dispatch order, with duplicates removed.
371 =head2 clone_object Instance -> Instance
373 Clones the given C<Instance> which must be an instance governed by this
376 =head2 clone_instance Instance, Parameters -> Instance
378 Clones the given C<Instance> and sets any additional parameters.