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