Commit | Line | Data |
c0e30cf5 |
1 | |
2 | package Moose::Meta::Class; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
648e79ae |
7 | use Class::MOP; |
8 | |
6ba6d68c |
9 | use Carp 'confess'; |
54b1cdf0 |
10 | use Scalar::Util 'weaken', 'blessed', 'reftype'; |
a15dff8d |
11 | |
1341f10c |
12 | our $VERSION = '0.07'; |
bc1e29b5 |
13 | |
c0e30cf5 |
14 | use base 'Class::MOP::Class'; |
15 | |
598340d5 |
16 | __PACKAGE__->meta->add_attribute('roles' => ( |
ef333f17 |
17 | reader => 'roles', |
18 | default => sub { [] } |
19 | )); |
20 | |
590868a3 |
21 | sub initialize { |
22 | my $class = shift; |
23 | my $pkg = shift; |
24 | $class->SUPER::initialize($pkg, |
25 | ':attribute_metaclass' => 'Moose::Meta::Attribute', |
ddd0ec20 |
26 | ':instance_metaclass' => 'Moose::Meta::Instance', |
590868a3 |
27 | @_); |
1341f10c |
28 | } |
590868a3 |
29 | |
ef333f17 |
30 | sub add_role { |
31 | my ($self, $role) = @_; |
32 | (blessed($role) && $role->isa('Moose::Meta::Role')) |
33 | || confess "Roles must be instances of Moose::Meta::Role"; |
34 | push @{$self->roles} => $role; |
35 | } |
36 | |
b8aeb4dc |
37 | sub calculate_all_roles { |
38 | my $self = shift; |
39 | my %seen; |
40 | grep { !$seen{$_->name}++ } map { $_->calculate_all_roles } @{ $self->roles }; |
41 | } |
42 | |
ef333f17 |
43 | sub does_role { |
44 | my ($self, $role_name) = @_; |
45 | (defined $role_name) |
46 | || confess "You must supply a role name to look for"; |
9c429218 |
47 | foreach my $class ($self->class_precedence_list) { |
74f6d830 |
48 | next unless $class->can('meta'); |
9c429218 |
49 | foreach my $role (@{$class->meta->roles}) { |
50 | return 1 if $role->does_role($role_name); |
51 | } |
ef333f17 |
52 | } |
53 | return 0; |
54 | } |
55 | |
d79e62fd |
56 | sub excludes_role { |
57 | my ($self, $role_name) = @_; |
58 | (defined $role_name) |
59 | || confess "You must supply a role name to look for"; |
74f6d830 |
60 | foreach my $class ($self->class_precedence_list) { |
61 | next unless $class->can('meta'); |
9c429218 |
62 | foreach my $role (@{$class->meta->roles}) { |
63 | return 1 if $role->excludes_role($role_name); |
64 | } |
d79e62fd |
65 | } |
66 | return 0; |
67 | } |
68 | |
8c9d74e7 |
69 | sub new_object { |
70 | my ($class, %params) = @_; |
71 | my $self = $class->SUPER::new_object(%params); |
72 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
715ea0b7 |
73 | # FIXME: |
74 | # this does not accept undefined |
75 | # values, nor does it accept false |
76 | # values to be passed into the init-arg |
5faf11bb |
77 | next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger; |
78 | $attr->trigger->($self, $params{$attr->init_arg}, $attr); |
8c9d74e7 |
79 | } |
80 | return $self; |
81 | } |
82 | |
a15dff8d |
83 | sub construct_instance { |
84 | my ($class, %params) = @_; |
ddd0ec20 |
85 | my $meta_instance = $class->get_meta_instance; |
575db57d |
86 | # FIXME: |
87 | # the code below is almost certainly incorrect |
88 | # but this is foreign inheritence, so we might |
89 | # have to kludge it in the end. |
ddd0ec20 |
90 | my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance(); |
74f6d830 |
91 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
ddd0ec20 |
92 | $attr->initialize_instance_slot($meta_instance, $instance, \%params) |
a15dff8d |
93 | } |
94 | return $instance; |
95 | } |
96 | |
a7d0cd00 |
97 | |
093b12c2 |
98 | # FIXME: |
99 | # This is ugly |
100 | sub get_method_map { |
101 | my $self = shift; |
102 | my $map = $self->{'%:methods'}; |
a7d0cd00 |
103 | |
093b12c2 |
104 | my $class_name = $self->name; |
105 | my $method_metaclass = $self->method_metaclass; |
106 | |
107 | foreach my $symbol ($self->list_all_package_symbols('CODE')) { |
108 | |
109 | my $code = $self->get_package_symbol('&' . $symbol); |
110 | |
111 | next if exists $map->{$symbol} && |
112 | defined $map->{$symbol} && |
113 | $map->{$symbol}->body == $code; |
114 | |
115 | my $gv = B::svref_2object($code)->GV; |
116 | |
117 | my $pkg = $gv->STASH->NAME; |
118 | if ($pkg->can('meta') && $pkg->meta->isa('Moose::Meta::Role')) { |
119 | #my $role = $pkg->meta->name; |
120 | #next unless $self->does_role($role); |
121 | } |
122 | else { |
123 | next if ($gv->STASH->NAME || '') ne $class_name && |
124 | ($gv->NAME || '') ne '__ANON__'; |
125 | } |
126 | |
127 | $map->{$symbol} = $method_metaclass->wrap($code); |
128 | } |
129 | |
130 | return $map; |
a7d0cd00 |
131 | } |
132 | |
093b12c2 |
133 | #sub find_method_by_name { |
134 | # my ($self, $method_name) = @_; |
135 | # (defined $method_name && $method_name) |
136 | # || confess "You must define a method name to find"; |
137 | # # keep a record of what we have seen |
138 | # # here, this will handle all the |
139 | # # inheritence issues because we are |
140 | # # using the &class_precedence_list |
141 | # my %seen_class; |
142 | # foreach my $class ($self->class_precedence_list()) { |
143 | # next if $seen_class{$class}; |
144 | # $seen_class{$class}++; |
145 | # # fetch the meta-class ... |
146 | # my $meta = $self->initialize($class); |
147 | # return $meta->get_method($method_name) |
148 | # if $meta->has_method($method_name); |
149 | # } |
150 | #} |
151 | |
152 | ### --------------------------------------------- |
153 | |
a2eec5e7 |
154 | sub add_attribute { |
155 | my $self = shift; |
156 | my $name = shift; |
157 | if (scalar @_ == 1 && ref($_[0]) eq 'HASH') { |
158 | # NOTE: |
159 | # if it is a HASH ref, we de-ref it. |
160 | # this will usually mean that it is |
161 | # coming from a role |
162 | $self->SUPER::add_attribute($name => %{$_[0]}); |
163 | } |
164 | else { |
165 | # otherwise we just pass the args |
166 | $self->SUPER::add_attribute($name => @_); |
167 | } |
168 | } |
169 | |
78cd1d3b |
170 | sub add_override_method_modifier { |
171 | my ($self, $name, $method, $_super_package) = @_; |
d05cd563 |
172 | (!$self->has_method($name)) |
173 | || confess "Cannot add an override method if a local method is already present"; |
78cd1d3b |
174 | # need this for roles ... |
175 | $_super_package ||= $self->name; |
176 | my $super = $self->find_next_method_by_name($name); |
177 | (defined $super) |
178 | || confess "You cannot override '$name' because it has no super method"; |
093b12c2 |
179 | $self->add_method($name => Moose::Meta::Method::Overriden->wrap(sub { |
78cd1d3b |
180 | my @args = @_; |
181 | no strict 'refs'; |
182 | no warnings 'redefine'; |
183 | local *{$_super_package . '::super'} = sub { $super->(@args) }; |
184 | return $method->(@args); |
093b12c2 |
185 | })); |
78cd1d3b |
186 | } |
187 | |
188 | sub add_augment_method_modifier { |
05d9eaf6 |
189 | my ($self, $name, $method) = @_; |
d05cd563 |
190 | (!$self->has_method($name)) |
191 | || confess "Cannot add an augment method if a local method is already present"; |
78cd1d3b |
192 | my $super = $self->find_next_method_by_name($name); |
193 | (defined $super) |
05d9eaf6 |
194 | || confess "You cannot augment '$name' because it has no super method"; |
195 | my $_super_package = $super->package_name; |
196 | # BUT!,... if this is an overriden method .... |
197 | if ($super->isa('Moose::Meta::Method::Overriden')) { |
198 | # we need to be sure that we actually |
199 | # find the next method, which is not |
200 | # an 'override' method, the reason is |
201 | # that an 'override' method will not |
202 | # be the one calling inner() |
203 | my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name); |
204 | $_super_package = $real_super->package_name; |
205 | } |
78cd1d3b |
206 | $self->add_method($name => sub { |
207 | my @args = @_; |
208 | no strict 'refs'; |
209 | no warnings 'redefine'; |
05d9eaf6 |
210 | local *{$_super_package . '::inner'} = sub { $method->(@args) }; |
78cd1d3b |
211 | return $super->(@args); |
212 | }); |
213 | } |
214 | |
1341f10c |
215 | ## Private Utility methods ... |
216 | |
05d9eaf6 |
217 | sub _find_next_method_by_name_which_is_not_overridden { |
218 | my ($self, $name) = @_; |
68efb014 |
219 | foreach my $method ($self->find_all_methods_by_name($name)) { |
05d9eaf6 |
220 | return $method->{code} |
221 | if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden'); |
222 | } |
223 | return undef; |
224 | } |
225 | |
1341f10c |
226 | sub _fix_metaclass_incompatability { |
227 | my ($self, @superclasses) = @_; |
228 | foreach my $super (@superclasses) { |
229 | # don't bother if it does not have a meta. |
230 | next unless $super->can('meta'); |
231 | # if it's meta is a vanilla Moose, |
232 | # then we can safely ignore it. |
233 | next if blessed($super->meta) eq 'Moose::Meta::Class'; |
234 | # but if we have anything else, |
235 | # we need to check it out ... |
236 | unless (# see if of our metaclass is incompatible |
237 | ($self->isa(blessed($super->meta)) && |
238 | # and see if our instance metaclass is incompatible |
239 | $self->instance_metaclass->isa($super->meta->instance_metaclass)) && |
240 | # ... and if we are just a vanilla Moose |
241 | $self->isa('Moose::Meta::Class')) { |
242 | # re-initialize the meta ... |
243 | my $super_meta = $super->meta; |
244 | # NOTE: |
245 | # We might want to consider actually |
246 | # transfering any attributes from the |
247 | # original meta into this one, but in |
248 | # general you should not have any there |
249 | # at this point anyway, so it's very |
250 | # much an obscure edge case anyway |
251 | $self = $super_meta->reinitialize($self->name => ( |
252 | ':attribute_metaclass' => $super_meta->attribute_metaclass, |
253 | ':method_metaclass' => $super_meta->method_metaclass, |
254 | ':instance_metaclass' => $super_meta->instance_metaclass, |
255 | )); |
256 | } |
257 | } |
258 | return $self; |
259 | } |
260 | |
261 | sub _apply_all_roles { |
262 | my ($self, @roles) = @_; |
263 | ($_->can('meta') && $_->meta->isa('Moose::Meta::Role')) |
264 | || confess "You can only consume roles, $_ is not a Moose role" |
265 | foreach @roles; |
266 | if (scalar @roles == 1) { |
267 | $roles[0]->meta->apply($self); |
268 | } |
269 | else { |
68efb014 |
270 | # FIXME |
271 | # we should make a Moose::Meta::Role::Composite |
272 | # which is a smaller version of Moose::Meta::Role |
273 | # which does not use any package stuff |
1341f10c |
274 | Moose::Meta::Role->combine( |
275 | map { $_->meta } @roles |
276 | )->apply($self); |
277 | } |
278 | } |
279 | |
280 | sub _process_attribute { |
281 | my ($self, $name, %options) = @_; |
282 | if ($name =~ /^\+(.*)/) { |
283 | my $new_attr = $self->_process_inherited_attribute($1, %options); |
284 | $self->add_attribute($new_attr); |
285 | } |
286 | else { |
287 | if ($options{metaclass}) { |
288 | Moose::_load_all_classes($options{metaclass}); |
289 | $self->add_attribute($options{metaclass}->new($name, %options)); |
290 | } |
291 | else { |
292 | $self->add_attribute($name, %options); |
293 | } |
294 | } |
295 | } |
296 | |
297 | sub _process_inherited_attribute { |
298 | my ($self, $attr_name, %options) = @_; |
299 | my $inherited_attr = $self->find_attribute_by_name($attr_name); |
300 | (defined $inherited_attr) |
301 | || confess "Could not find an attribute by the name of '$attr_name' to inherit from"; |
302 | my $new_attr; |
303 | if ($inherited_attr->isa('Moose::Meta::Attribute')) { |
304 | $new_attr = $inherited_attr->clone_and_inherit_options(%options); |
305 | } |
306 | else { |
307 | # NOTE: |
308 | # kind of a kludge to handle Class::MOP::Attributes |
309 | $new_attr = Moose::Meta::Attribute::clone_and_inherit_options( |
310 | $inherited_attr, %options |
311 | ); |
312 | } |
313 | return $new_attr; |
314 | } |
315 | |
05d9eaf6 |
316 | package Moose::Meta::Method::Overriden; |
317 | |
318 | use strict; |
319 | use warnings; |
320 | |
321 | our $VERSION = '0.01'; |
322 | |
323 | use base 'Class::MOP::Method'; |
324 | |
c0e30cf5 |
325 | 1; |
326 | |
327 | __END__ |
328 | |
329 | =pod |
330 | |
331 | =head1 NAME |
332 | |
e522431d |
333 | Moose::Meta::Class - The Moose metaclass |
c0e30cf5 |
334 | |
c0e30cf5 |
335 | =head1 DESCRIPTION |
336 | |
e522431d |
337 | This is a subclass of L<Class::MOP::Class> with Moose specific |
338 | extensions. |
339 | |
6ba6d68c |
340 | For the most part, the only time you will ever encounter an |
341 | instance of this class is if you are doing some serious deep |
342 | introspection. To really understand this class, you need to refer |
343 | to the L<Class::MOP::Class> documentation. |
344 | |
c0e30cf5 |
345 | =head1 METHODS |
346 | |
347 | =over 4 |
348 | |
590868a3 |
349 | =item B<initialize> |
350 | |
8c9d74e7 |
351 | =item B<new_object> |
352 | |
02a0fb52 |
353 | We override this method to support the C<trigger> attribute option. |
354 | |
a15dff8d |
355 | =item B<construct_instance> |
356 | |
6ba6d68c |
357 | This provides some Moose specific extensions to this method, you |
358 | almost never call this method directly unless you really know what |
359 | you are doing. |
360 | |
361 | This method makes sure to handle the moose weak-ref, type-constraint |
362 | and type coercion features. |
ef1d5f4b |
363 | |
093b12c2 |
364 | =item B<get_method_map> |
e9ec68d6 |
365 | |
68efb014 |
366 | This accommodates Moose::Meta::Role::Method instances, which are |
e9ec68d6 |
367 | aliased, instead of added, but still need to be counted as valid |
368 | methods. |
369 | |
78cd1d3b |
370 | =item B<add_override_method_modifier ($name, $method)> |
371 | |
02a0fb52 |
372 | This will create an C<override> method modifier for you, and install |
373 | it in the package. |
374 | |
78cd1d3b |
375 | =item B<add_augment_method_modifier ($name, $method)> |
376 | |
02a0fb52 |
377 | This will create an C<augment> method modifier for you, and install |
378 | it in the package. |
379 | |
2b14ac61 |
380 | =item B<calculate_all_roles> |
381 | |
ef333f17 |
382 | =item B<roles> |
383 | |
02a0fb52 |
384 | This will return an array of C<Moose::Meta::Role> instances which are |
385 | attached to this class. |
386 | |
ef333f17 |
387 | =item B<add_role ($role)> |
388 | |
02a0fb52 |
389 | This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it |
390 | to the list of associated roles. |
391 | |
ef333f17 |
392 | =item B<does_role ($role_name)> |
393 | |
02a0fb52 |
394 | This will test if this class C<does> a given C<$role_name>. It will |
395 | not only check it's local roles, but ask them as well in order to |
396 | cascade down the role hierarchy. |
397 | |
d79e62fd |
398 | =item B<excludes_role ($role_name)> |
399 | |
400 | This will test if this class C<excludes> a given C<$role_name>. It will |
401 | not only check it's local roles, but ask them as well in order to |
402 | cascade down the role hierarchy. |
403 | |
9e93dd19 |
404 | =item B<add_attribute ($attr_name, %params|$params)> |
4e848edb |
405 | |
9e93dd19 |
406 | This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds |
407 | support for taking the C<$params> as a HASH ref. |
ac1ef2f9 |
408 | |
c0e30cf5 |
409 | =back |
410 | |
411 | =head1 BUGS |
412 | |
413 | All complex software has bugs lurking in it, and this module is no |
414 | exception. If you find a bug please either email me, or add the bug |
415 | to cpan-RT. |
416 | |
c0e30cf5 |
417 | =head1 AUTHOR |
418 | |
419 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
420 | |
421 | =head1 COPYRIGHT AND LICENSE |
422 | |
423 | Copyright 2006 by Infinity Interactive, Inc. |
424 | |
425 | L<http://www.iinteractive.com> |
426 | |
427 | This library is free software; you can redistribute it and/or modify |
428 | it under the same terms as Perl itself. |
429 | |
8a7a9c53 |
430 | =cut |
1a563243 |
431 | |