Commit | Line | Data |
306290e8 |
1 | package Mouse::Meta::Class; |
c3398f5b |
2 | use strict; |
3 | use warnings; |
4 | |
cecfb973 |
5 | use Scalar::Util qw/blessed weaken/; |
6d28c5cf |
6 | |
04493075 |
7 | use Mouse::Util qw/:meta get_linear_isa not_supported/; |
72b88a88 |
8 | |
6d28c5cf |
9 | use Mouse::Meta::Method::Constructor; |
10 | use Mouse::Meta::Method::Destructor; |
11 | use Mouse::Meta::Module; |
f3bb863f |
12 | our @ISA = qw(Mouse::Meta::Module); |
3a63a2e7 |
13 | |
6cfa1e5e |
14 | sub method_metaclass(){ 'Mouse::Meta::Method' } # required for get_method() |
3a63a2e7 |
15 | |
8e64d0fa |
16 | sub _construct_meta { |
88ed7189 |
17 | my($class, %args) = @_; |
c3398f5b |
18 | |
8536d351 |
19 | $args{attributes} ||= {}; |
20 | $args{methods} ||= {}; |
21 | $args{roles} ||= []; |
22 | |
c3398f5b |
23 | $args{superclasses} = do { |
24 | no strict 'refs'; |
88ed7189 |
25 | \@{ $args{package} . '::ISA' }; |
c3398f5b |
26 | }; |
27 | |
7a50b450 |
28 | #return Mouse::Meta::Class->initialize($class)->new_object(%args) |
29 | # if $class ne __PACKAGE__; |
30 | |
8e64d0fa |
31 | return bless \%args, ref($class) || $class; |
7a50b450 |
32 | } |
33 | |
34 | sub create_anon_class{ |
35 | my $self = shift; |
36 | return $self->create(undef, @_); |
37 | } |
38 | |
39 | sub is_anon_class{ |
40 | return exists $_[0]->{anon_serial_id}; |
c3398f5b |
41 | } |
42 | |
afc73948 |
43 | sub roles { $_[0]->{roles} } |
c3398f5b |
44 | |
45 | sub superclasses { |
46 | my $self = shift; |
47 | |
48 | if (@_) { |
49 | Mouse::load_class($_) for @_; |
50 | @{ $self->{superclasses} } = @_; |
51 | } |
52 | |
8e64d0fa |
53 | return @{ $self->{superclasses} }; |
54 | } |
55 | |
56 | sub find_method_by_name{ |
57 | my($self, $method_name) = @_; |
58 | defined($method_name) |
59 | or $self->throw_error('You must define a method name to find'); |
60 | foreach my $class( $self->linearized_isa ){ |
61 | my $method = $self->initialize($class)->get_method($method_name); |
62 | return $method if defined $method; |
63 | } |
64 | return undef; |
65 | } |
66 | |
67 | sub get_all_methods { |
68 | my($self) = @_; |
612d3e1a |
69 | return map{ $self->find_method_by_name($_) } $self->get_all_method_names; |
c3398f5b |
70 | } |
71 | |
60cfc6ad |
72 | sub get_all_method_names { |
73 | my $self = shift; |
74 | my %uniq; |
75 | return grep { $uniq{$_}++ == 0 } |
3a63a2e7 |
76 | map { Mouse::Meta::Class->initialize($_)->get_method_list() } |
60cfc6ad |
77 | $self->linearized_isa; |
78 | } |
79 | |
87ca293b |
80 | sub add_attribute { |
c3398f5b |
81 | my $self = shift; |
60f6eba9 |
82 | |
87ca293b |
83 | my($attr, $name); |
1b9e472d |
84 | |
87ca293b |
85 | if(blessed $_[0]){ |
86 | $attr = $_[0]; |
1b9e472d |
87 | |
87ca293b |
88 | $attr->isa('Mouse::Meta::Attribute') |
89 | || $self->throw_error("Your attribute must be an instance of Mouse::Meta::Attribute (or a subclass)"); |
1b9e472d |
90 | |
87ca293b |
91 | $name = $attr->name; |
1b9e472d |
92 | } |
93 | else{ |
87ca293b |
94 | # _process_attribute |
95 | $name = shift; |
1b9e472d |
96 | |
87ca293b |
97 | my %args = (@_ == 1) ? %{$_[0]} : @_; |
1b9e472d |
98 | |
87ca293b |
99 | defined($name) |
100 | or $self->throw_error('You must provide a name for the attribute'); |
1b9e472d |
101 | |
87ca293b |
102 | if ($name =~ s/^\+//) { # inherited attributes |
103 | my $inherited_attr; |
104 | |
105 | foreach my $class($self->linearized_isa){ |
739525d0 |
106 | my $meta = Mouse::Util::get_metaclass_by_name($class) or next; |
87ca293b |
107 | $inherited_attr = $meta->get_attribute($name) and last; |
108 | } |
109 | |
110 | defined($inherited_attr) |
111 | or $self->throw_error("Could not find an attribute by the name of '$name' to inherit from in ".$self->name); |
112 | |
113 | $attr = $inherited_attr->clone_and_inherit_options($name, \%args); |
114 | } |
115 | else{ |
116 | my($attribute_class, @traits) = Mouse::Meta::Attribute->interpolate_class($name, \%args); |
117 | $args{traits} = \@traits if @traits; |
118 | |
119 | $attr = $attribute_class->new($name, \%args); |
120 | } |
121 | } |
1b9e472d |
122 | |
123 | weaken( $attr->{associated_class} = $self ); |
124 | |
125 | $self->{attributes}{$attr->name} = $attr; |
126 | $attr->install_accessors(); |
127 | |
04493075 |
128 | if(_MOUSE_VERBOSE && !$attr->{associated_methods} && ($attr->{is} || '') ne 'bare'){ |
1b9e472d |
129 | Carp::cluck(qq{Attribute (}.$attr->name.qq{) of class }.$self->name.qq{ has no associated methods (did you mean to provide an "is" argument?)}); |
60f6eba9 |
130 | } |
1b9e472d |
131 | return $attr; |
c3398f5b |
132 | } |
133 | |
d60824af |
134 | sub compute_all_applicable_attributes { shift->get_all_attributes(@_) } |
135 | sub get_all_attributes { |
72b88a88 |
136 | my $self = shift; |
137 | my (@attr, %seen); |
138 | |
139 | for my $class ($self->linearized_isa) { |
140 | my $meta = $self->_metaclass_cache($class) |
141 | or next; |
142 | |
143 | for my $name (keys %{ $meta->get_attribute_map }) { |
144 | next if $seen{$name}++; |
145 | push @attr, $meta->get_attribute($name); |
146 | } |
147 | } |
148 | |
149 | return @attr; |
150 | } |
151 | |
8536d351 |
152 | sub linearized_isa { @{ get_linear_isa($_[0]->name) } } |
153 | |
154 | sub new_object { |
c68b4110 |
155 | my $self = shift; |
7a50b450 |
156 | my %args = (@_ == 1 ? %{$_[0]} : @_); |
c3398f5b |
157 | |
fce211ae |
158 | my $instance = bless {}, $self->name; |
159 | |
1b9e472d |
160 | $self->_initialize_instance($instance, \%args); |
161 | return $instance; |
162 | } |
163 | |
164 | sub _initialize_instance{ |
165 | my($self, $instance, $args) = @_; |
166 | |
53c495ce |
167 | my @triggers_queue; |
168 | |
fce211ae |
169 | foreach my $attribute ($self->get_all_attributes) { |
8536d351 |
170 | my $from = $attribute->init_arg; |
171 | my $key = $attribute->name; |
172 | |
1b9e472d |
173 | if (defined($from) && exists($args->{$from})) { |
ffbbf459 |
174 | $instance->{$key} = $attribute->_coerce_and_verify($args->{$from}); |
8536d351 |
175 | |
176 | weaken($instance->{$key}) |
fce211ae |
177 | if ref($instance->{$key}) && $attribute->is_weak_ref; |
8536d351 |
178 | |
179 | if ($attribute->has_trigger) { |
ffbbf459 |
180 | push @triggers_queue, [ $attribute->trigger, $instance->{$from} ]; |
8536d351 |
181 | } |
182 | } |
183 | else { |
184 | if ($attribute->has_default || $attribute->has_builder) { |
185 | unless ($attribute->is_lazy) { |
186 | my $default = $attribute->default; |
187 | my $builder = $attribute->builder; |
8215d725 |
188 | my $value = $builder ? $instance->$builder() |
189 | : ref($default) eq 'CODE' ? $instance->$default() |
190 | : $default; |
8536d351 |
191 | |
8215d725 |
192 | # XXX: we cannot use $attribute->set_value() because it invokes triggers. |
193 | $instance->{$key} = $attribute->_coerce_and_verify($value, $instance);; |
8536d351 |
194 | |
195 | weaken($instance->{$key}) |
fce211ae |
196 | if ref($instance->{$key}) && $attribute->is_weak_ref; |
8536d351 |
197 | } |
198 | } |
199 | else { |
200 | if ($attribute->is_required) { |
fce211ae |
201 | $self->throw_error("Attribute (".$attribute->name.") is required"); |
8536d351 |
202 | } |
203 | } |
204 | } |
205 | } |
53c495ce |
206 | |
207 | foreach my $trigger_and_value(@triggers_queue){ |
208 | my($trigger, $value) = @{$trigger_and_value}; |
209 | $trigger->($instance, $value); |
210 | } |
211 | |
2efc0af1 |
212 | if($self->is_anon_class){ |
213 | $instance->{__METACLASS__} = $self; |
214 | } |
215 | |
8536d351 |
216 | return $instance; |
217 | } |
c3398f5b |
218 | |
7a59f4e8 |
219 | sub clone_object { |
220 | my $class = shift; |
221 | my $instance = shift; |
2cea7a5f |
222 | my %params = (@_ == 1) ? %{$_[0]} : @_; |
7a59f4e8 |
223 | |
224 | (blessed($instance) && $instance->isa($class->name)) |
fce211ae |
225 | || $class->throw_error("You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"); |
7a59f4e8 |
226 | |
7a59f4e8 |
227 | my $clone = bless { %$instance }, ref $instance; |
228 | |
d60824af |
229 | foreach my $attr ($class->get_all_attributes()) { |
7a59f4e8 |
230 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
231 | if (exists $params{$init_arg}) { |
232 | $clone->{ $attr->name } = $params{$init_arg}; |
233 | } |
234 | } |
235 | } |
236 | |
237 | return $clone; |
2cea7a5f |
238 | } |
7a59f4e8 |
239 | |
2cea7a5f |
240 | sub clone_instance { |
241 | my ($class, $instance, %params) = @_; |
242 | |
04493075 |
243 | Carp::cluck('clone_instance has been deprecated. Use clone_object instead') |
244 | if _MOUSE_VERBOSE; |
2cea7a5f |
245 | return $class->clone_object($instance, %params); |
7a59f4e8 |
246 | } |
247 | |
fc1d8369 |
248 | sub make_immutable { |
249 | my $self = shift; |
6a1d1835 |
250 | my %args = ( |
251 | inline_constructor => 1, |
e578d610 |
252 | inline_destructor => 1, |
6a1d1835 |
253 | @_, |
254 | ); |
255 | |
fc1d8369 |
256 | $self->{is_immutable}++; |
c7a6403f |
257 | |
6a1d1835 |
258 | if ($args{inline_constructor}) { |
c7a6403f |
259 | $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self )); |
260 | } |
261 | |
8632b6fe |
262 | if ($args{inline_destructor}) { |
263 | $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self )); |
264 | } |
2276cb14 |
265 | |
266 | # Moose's make_immutable returns true allowing calling code to skip setting an explicit true value |
267 | # at the end of a source file. |
268 | return 1; |
fc1d8369 |
269 | } |
ad958001 |
270 | |
fce211ae |
271 | sub make_mutable { not_supported } |
ad958001 |
272 | |
6cfa1e5e |
273 | sub is_immutable { $_[0]->{is_immutable} } |
274 | sub is_mutable { !$_[0]->{is_immutable} } |
84ef660f |
275 | |
3fbade18 |
276 | sub _install_modifier_pp{ |
277 | my( $self, $into, $type, $name, $code ) = @_; |
278 | |
279 | my $original = $into->can($name) |
280 | or $self->throw_error("The method '$name' is not found in the inheritance hierarchy for class $into"); |
281 | |
282 | my $modifier_table = $self->{modifiers}{$name}; |
283 | |
284 | if(!$modifier_table){ |
285 | my(@before, @after, @around, $cache, $modified); |
286 | |
287 | $cache = $original; |
288 | |
289 | $modified = sub { |
290 | for my $c (@before) { $c->(@_) } |
291 | |
292 | if(wantarray){ # list context |
293 | my @rval = $cache->(@_); |
294 | |
295 | for my $c(@after){ $c->(@_) } |
296 | return @rval; |
297 | } |
298 | elsif(defined wantarray){ # scalar context |
299 | my $rval = $cache->(@_); |
300 | |
301 | for my $c(@after){ $c->(@_) } |
302 | return $rval; |
303 | } |
304 | else{ # void context |
305 | $cache->(@_); |
306 | |
307 | for my $c(@after){ $c->(@_) } |
308 | return; |
309 | } |
310 | }; |
311 | |
312 | $self->{modifiers}{$name} = $modifier_table = { |
313 | original => $original, |
314 | |
315 | before => \@before, |
316 | after => \@after, |
317 | around => \@around, |
318 | |
319 | cache => \$cache, # cache for around modifiers |
320 | }; |
321 | |
322 | $self->add_method($name => $modified); |
323 | } |
324 | |
325 | if($type eq 'before'){ |
326 | unshift @{$modifier_table->{before}}, $code; |
327 | } |
328 | elsif($type eq 'after'){ |
329 | push @{$modifier_table->{after}}, $code; |
330 | } |
331 | else{ # around |
332 | push @{$modifier_table->{around}}, $code; |
333 | |
334 | my $next = ${ $modifier_table->{cache} }; |
335 | ${ $modifier_table->{cache} } = sub{ $code->($next, @_) }; |
336 | } |
337 | |
338 | return; |
339 | } |
340 | |
4859d490 |
341 | sub _install_modifier { |
342 | my ( $self, $into, $type, $name, $code ) = @_; |
4f5b44a0 |
343 | |
3fbade18 |
344 | # load Class::Method::Modifiers first |
7ca5c5fb |
345 | my $no_cmm_fast = do{ |
3fbade18 |
346 | local $@; |
347 | eval q{ require Class::Method::Modifiers::Fast }; |
348 | $@; |
4f5b44a0 |
349 | }; |
4f5b44a0 |
350 | |
3fbade18 |
351 | my $impl; |
352 | if($no_cmm_fast){ |
353 | $impl = \&_install_modifier_pp; |
354 | } |
355 | else{ |
356 | my $install_modifier = Class::Method::Modifiers::Fast->can('_install_modifier'); |
357 | $impl = sub { |
4f5b44a0 |
358 | my ( $self, $into, $type, $name, $code ) = @_; |
3fbade18 |
359 | $install_modifier->( |
4f5b44a0 |
360 | $into, |
361 | $type, |
362 | $name, |
363 | $code |
364 | ); |
6cfa1e5e |
365 | $self->{methods}{$name}++; # register it to the method map |
366 | return; |
4f5b44a0 |
367 | }; |
1b79a118 |
368 | } |
4f5b44a0 |
369 | |
3fbade18 |
370 | # replace this method itself :) |
371 | { |
372 | no warnings 'redefine'; |
373 | *_install_modifier = $impl; |
374 | } |
375 | |
376 | $self->$impl( $into, $type, $name, $code ); |
4859d490 |
377 | } |
378 | |
50dc6ee5 |
379 | sub add_before_method_modifier { |
4859d490 |
380 | my ( $self, $name, $code ) = @_; |
381 | $self->_install_modifier( $self->name, 'before', $name, $code ); |
50dc6ee5 |
382 | } |
383 | |
384 | sub add_around_method_modifier { |
4859d490 |
385 | my ( $self, $name, $code ) = @_; |
386 | $self->_install_modifier( $self->name, 'around', $name, $code ); |
50dc6ee5 |
387 | } |
388 | |
389 | sub add_after_method_modifier { |
4859d490 |
390 | my ( $self, $name, $code ) = @_; |
391 | $self->_install_modifier( $self->name, 'after', $name, $code ); |
50dc6ee5 |
392 | } |
393 | |
67199842 |
394 | sub add_override_method_modifier { |
395 | my ($self, $name, $code) = @_; |
396 | |
6cfa1e5e |
397 | my $package = $self->name; |
67199842 |
398 | |
6cfa1e5e |
399 | my $body = $package->can($name) |
400 | or $self->throw_error("You cannot override '$name' because it has no super method"); |
67199842 |
401 | |
6cfa1e5e |
402 | $self->add_method($name => sub { $code->($package, $body, @_) }); |
67199842 |
403 | } |
404 | |
47f36c05 |
405 | sub does_role { |
406 | my ($self, $role_name) = @_; |
ad958001 |
407 | |
47f36c05 |
408 | (defined $role_name) |
fce211ae |
409 | || $self->throw_error("You must supply a role name to look for"); |
ad958001 |
410 | |
f7fec86c |
411 | for my $class ($self->linearized_isa) { |
739525d0 |
412 | my $meta = Mouse::Util::get_metaclass_by_name($class); |
3a63a2e7 |
413 | next unless $meta && $meta->can('roles'); |
414 | |
415 | for my $role (@{ $meta->roles }) { |
ff687069 |
416 | |
3a63a2e7 |
417 | return 1 if $role->does_role($role_name); |
f7fec86c |
418 | } |
47f36c05 |
419 | } |
ad958001 |
420 | |
47f36c05 |
421 | return 0; |
422 | } |
423 | |
c3398f5b |
424 | 1; |
425 | |
426 | __END__ |
427 | |
428 | =head1 NAME |
429 | |
1820fffe |
430 | Mouse::Meta::Class - The Mouse class metaclass |
c3398f5b |
431 | |
432 | =head1 METHODS |
433 | |
612d3e1a |
434 | =head2 C<< initialize(ClassName) -> Mouse::Meta::Class >> |
c3398f5b |
435 | |
31c5194b |
436 | Finds or creates a C<Mouse::Meta::Class> instance for the given ClassName. Only |
306290e8 |
437 | one instance should exist for a given class. |
c3398f5b |
438 | |
612d3e1a |
439 | =head2 C<< name -> ClassName >> |
c3398f5b |
440 | |
441 | Returns the name of the owner class. |
442 | |
612d3e1a |
443 | =head2 C<< superclasses -> ClassNames >> C<< superclass(ClassNames) >> |
c3398f5b |
444 | |
445 | Gets (or sets) the list of superclasses of the owner class. |
446 | |
31c5194b |
447 | =head2 C<< add_method(name => CodeRef) >> |
c3398f5b |
448 | |
31c5194b |
449 | Adds a method to the owner class. |
c3398f5b |
450 | |
31c5194b |
451 | =head2 C<< has_method(name) -> Bool >> |
72b88a88 |
452 | |
31c5194b |
453 | Returns whether we have a method with the given name. |
72b88a88 |
454 | |
31c5194b |
455 | =head2 C<< get_method(name) -> Mouse::Meta::Method | undef >> |
c68b4110 |
456 | |
31c5194b |
457 | Returns a L<Mouse::Meta::Method> with the given name. |
458 | |
459 | Note that you can also use C<< $metaclass->name->can($name) >> for a method body. |
460 | |
461 | =head2 C<< get_method_list -> Names >> |
462 | |
463 | Returns a list of method names which are defined in the local class. |
464 | If you want a list of all applicable methods for a class, use the |
465 | C<get_all_methods> method. |
466 | |
467 | =head2 C<< get_all_methods -> (Mouse::Meta::Method) >> |
468 | |
469 | Return the list of all L<Mouse::Meta::Method> instances associated with |
470 | the class and its superclasses. |
471 | |
472 | =head2 C<< add_attribute(name => spec | Mouse::Meta::Attribute) >> |
473 | |
474 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
475 | class. |
c68b4110 |
476 | |
612d3e1a |
477 | =head2 C<< has_attribute(Name) -> Bool >> |
66eea168 |
478 | |
479 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
480 | |
31c5194b |
481 | =head2 C<< get_attribute Name -> Mouse::Meta::Attribute | undef >> |
c3398f5b |
482 | |
306290e8 |
483 | Returns the L<Mouse::Meta::Attribute> with the given name. |
c3398f5b |
484 | |
31c5194b |
485 | =head2 C<< get_attribute_list -> Names >> |
486 | |
487 | Returns a list of attribute names which are defined in the local |
488 | class. If you want a list of all applicable attributes for a class, |
489 | use the C<get_all_attributes> method. |
490 | |
491 | =head2 C<< get_all_attributes -> (Mouse::Meta::Attribute) >> |
492 | |
493 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
494 | this class and its superclasses. |
495 | |
612d3e1a |
496 | =head2 C<< linearized_isa -> [ClassNames] >> |
c3398f5b |
497 | |
498 | Returns the list of classes in method dispatch order, with duplicates removed. |
499 | |
612d3e1a |
500 | =head2 C<< new_object(Parameters) -> Instance >> |
2cea7a5f |
501 | |
612d3e1a |
502 | Creates a new instance. |
2cea7a5f |
503 | |
612d3e1a |
504 | =head2 C<< clone_object(Instance, Parameters) -> Instance >> |
f7b11a21 |
505 | |
31c5194b |
506 | Clones the given instance which must be an instance governed by this |
f7b11a21 |
507 | metaclass. |
508 | |
31c5194b |
509 | =head2 C<< throw_error(Message, Parameters) >> |
510 | |
511 | Throws an error with the given message. |
512 | |
1820fffe |
513 | =head1 SEE ALSO |
f7b11a21 |
514 | |
1820fffe |
515 | L<Moose::Meta::Class> |
f7b11a21 |
516 | |
31c5194b |
517 | L<Class::MOP::Class> |
518 | |
c3398f5b |
519 | =cut |
520 | |