Commit | Line | Data |
306290e8 |
1 | package Mouse::Meta::Class; |
c3398f5b |
2 | use strict; |
3 | use warnings; |
4 | |
fc1d8369 |
5 | use Mouse::Meta::Method::Constructor; |
bbf64e76 |
6 | use Mouse::Meta::Method::Destructor; |
cecfb973 |
7 | use Scalar::Util qw/blessed weaken/; |
fce211ae |
8 | use Mouse::Util qw/get_linear_isa not_supported/; |
72b88a88 |
9 | |
3a63a2e7 |
10 | use base qw(Mouse::Meta::Module); |
11 | |
3a63a2e7 |
12 | |
8536d351 |
13 | sub _new { |
88ed7189 |
14 | my($class, %args) = @_; |
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15 | |
8536d351 |
16 | $args{attributes} ||= {}; |
17 | $args{methods} ||= {}; |
18 | $args{roles} ||= []; |
19 | |
c3398f5b |
20 | $args{superclasses} = do { |
21 | no strict 'refs'; |
88ed7189 |
22 | \@{ $args{package} . '::ISA' }; |
c3398f5b |
23 | }; |
24 | |
25 | bless \%args, $class; |
26 | } |
27 | |
afc73948 |
28 | sub roles { $_[0]->{roles} } |
c3398f5b |
29 | |
30 | sub superclasses { |
31 | my $self = shift; |
32 | |
33 | if (@_) { |
34 | Mouse::load_class($_) for @_; |
35 | @{ $self->{superclasses} } = @_; |
36 | } |
37 | |
38 | @{ $self->{superclasses} }; |
39 | } |
40 | |
60cfc6ad |
41 | sub get_all_method_names { |
42 | my $self = shift; |
43 | my %uniq; |
44 | return grep { $uniq{$_}++ == 0 } |
3a63a2e7 |
45 | map { Mouse::Meta::Class->initialize($_)->get_method_list() } |
60cfc6ad |
46 | $self->linearized_isa; |
47 | } |
48 | |
c3398f5b |
49 | sub add_attribute { |
50 | my $self = shift; |
c3398f5b |
51 | |
60f6eba9 |
52 | if (@_ == 1 && blessed($_[0])) { |
53 | my $attr = shift @_; |
54 | $self->{'attributes'}{$attr->name} = $attr; |
55 | } else { |
56 | my $names = shift @_; |
57 | $names = [$names] if !ref($names); |
58 | my $metaclass = 'Mouse::Meta::Attribute'; |
59 | my %options = @_; |
60 | |
61 | if ( my $metaclass_name = delete $options{metaclass} ) { |
62 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
63 | 'Attribute', |
64 | $metaclass_name |
65 | ); |
66 | if ( $metaclass ne $new_class ) { |
67 | $metaclass = $new_class; |
68 | } |
69 | } |
70 | |
71 | for my $name (@$names) { |
72 | if ($name =~ s/^\+//) { |
73 | $metaclass->clone_parent($self, $name, @_); |
74 | } |
75 | else { |
76 | $metaclass->create($self, $name, @_); |
77 | } |
78 | } |
79 | } |
c3398f5b |
80 | } |
81 | |
d60824af |
82 | sub compute_all_applicable_attributes { shift->get_all_attributes(@_) } |
83 | sub get_all_attributes { |
72b88a88 |
84 | my $self = shift; |
85 | my (@attr, %seen); |
86 | |
87 | for my $class ($self->linearized_isa) { |
88 | my $meta = $self->_metaclass_cache($class) |
89 | or next; |
90 | |
91 | for my $name (keys %{ $meta->get_attribute_map }) { |
92 | next if $seen{$name}++; |
93 | push @attr, $meta->get_attribute($name); |
94 | } |
95 | } |
96 | |
97 | return @attr; |
98 | } |
99 | |
8536d351 |
100 | sub linearized_isa { @{ get_linear_isa($_[0]->name) } } |
101 | |
102 | sub new_object { |
c68b4110 |
103 | my $self = shift; |
8536d351 |
104 | my $args = (@_ == 1) ? $_[0] : { @_ }; |
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105 | |
fce211ae |
106 | my $instance = bless {}, $self->name; |
107 | |
108 | foreach my $attribute ($self->get_all_attributes) { |
8536d351 |
109 | my $from = $attribute->init_arg; |
110 | my $key = $attribute->name; |
111 | |
112 | if (defined($from) && exists($args->{$from})) { |
113 | $args->{$from} = $attribute->coerce_constraint($args->{$from}) |
114 | if $attribute->should_coerce; |
115 | $attribute->verify_against_type_constraint($args->{$from}); |
116 | |
117 | $instance->{$key} = $args->{$from}; |
118 | |
119 | weaken($instance->{$key}) |
fce211ae |
120 | if ref($instance->{$key}) && $attribute->is_weak_ref; |
8536d351 |
121 | |
122 | if ($attribute->has_trigger) { |
123 | $attribute->trigger->($instance, $args->{$from}); |
124 | } |
125 | } |
126 | else { |
127 | if ($attribute->has_default || $attribute->has_builder) { |
128 | unless ($attribute->is_lazy) { |
129 | my $default = $attribute->default; |
130 | my $builder = $attribute->builder; |
131 | my $value = $attribute->has_builder |
132 | ? $instance->$builder |
133 | : ref($default) eq 'CODE' |
134 | ? $default->($instance) |
135 | : $default; |
136 | |
137 | $value = $attribute->coerce_constraint($value) |
138 | if $attribute->should_coerce; |
139 | $attribute->verify_against_type_constraint($value); |
140 | |
141 | $instance->{$key} = $value; |
142 | |
143 | weaken($instance->{$key}) |
fce211ae |
144 | if ref($instance->{$key}) && $attribute->is_weak_ref; |
8536d351 |
145 | } |
146 | } |
147 | else { |
148 | if ($attribute->is_required) { |
fce211ae |
149 | $self->throw_error("Attribute (".$attribute->name.") is required"); |
8536d351 |
150 | } |
151 | } |
152 | } |
153 | } |
154 | return $instance; |
155 | } |
c3398f5b |
156 | |
7a59f4e8 |
157 | sub clone_object { |
158 | my $class = shift; |
159 | my $instance = shift; |
160 | |
161 | (blessed($instance) && $instance->isa($class->name)) |
fce211ae |
162 | || $class->throw_error("You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"); |
7a59f4e8 |
163 | |
164 | $class->clone_instance($instance, @_); |
165 | } |
166 | |
167 | sub clone_instance { |
168 | my ($class, $instance, %params) = @_; |
169 | |
170 | (blessed($instance)) |
fce211ae |
171 | || $class->throw_error("You can only clone instances, ($instance) is not a blessed instance"); |
7a59f4e8 |
172 | |
173 | my $clone = bless { %$instance }, ref $instance; |
174 | |
d60824af |
175 | foreach my $attr ($class->get_all_attributes()) { |
7a59f4e8 |
176 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
177 | if (exists $params{$init_arg}) { |
178 | $clone->{ $attr->name } = $params{$init_arg}; |
179 | } |
180 | } |
181 | } |
182 | |
183 | return $clone; |
184 | |
185 | } |
186 | |
fc1d8369 |
187 | sub make_immutable { |
188 | my $self = shift; |
6a1d1835 |
189 | my %args = ( |
190 | inline_constructor => 1, |
e578d610 |
191 | inline_destructor => 1, |
6a1d1835 |
192 | @_, |
193 | ); |
194 | |
fc1d8369 |
195 | $self->{is_immutable}++; |
c7a6403f |
196 | |
6a1d1835 |
197 | if ($args{inline_constructor}) { |
c7a6403f |
198 | $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self )); |
199 | } |
200 | |
8632b6fe |
201 | if ($args{inline_destructor}) { |
202 | $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self )); |
203 | } |
2276cb14 |
204 | |
205 | # Moose's make_immutable returns true allowing calling code to skip setting an explicit true value |
206 | # at the end of a source file. |
207 | return 1; |
fc1d8369 |
208 | } |
ad958001 |
209 | |
fce211ae |
210 | sub make_mutable { not_supported } |
ad958001 |
211 | |
fc1d8369 |
212 | sub is_immutable { $_[0]->{is_immutable} } |
84ef660f |
213 | |
214 | sub attribute_metaclass { "Mouse::Meta::Class" } |
7a59f4e8 |
215 | |
4859d490 |
216 | sub _install_modifier { |
217 | my ( $self, $into, $type, $name, $code ) = @_; |
4f5b44a0 |
218 | |
219 | # which is modifer class available? |
220 | my $modifier_class = do { |
221 | if (eval "require Class::Method::Modifiers::Fast; 1") { |
222 | 'Class::Method::Modifiers::Fast'; |
223 | } elsif (eval "require Class::Method::Modifiers; 1") { |
224 | 'Class::Method::Modifiers'; |
225 | } else { |
226 | Carp::croak("Method modifiers require the use of Class::Method::Modifiers or Class::Method::Modifiers::Fast. Please install it from CPAN and file a bug report with this application."); |
227 | } |
228 | }; |
229 | my $modifier = $modifier_class->can('_install_modifier'); |
230 | |
231 | # replace this method itself :) |
232 | { |
233 | no strict 'refs'; |
234 | no warnings 'redefine'; |
235 | *{__PACKAGE__ . '::_install_modifier'} = sub { |
236 | my ( $self, $into, $type, $name, $code ) = @_; |
237 | $modifier->( |
238 | $into, |
239 | $type, |
240 | $name, |
241 | $code |
242 | ); |
243 | }; |
1b79a118 |
244 | } |
4f5b44a0 |
245 | |
246 | # call me. for first time. |
247 | $self->_install_modifier( $into, $type, $name, $code ); |
4859d490 |
248 | } |
249 | |
50dc6ee5 |
250 | sub add_before_method_modifier { |
4859d490 |
251 | my ( $self, $name, $code ) = @_; |
252 | $self->_install_modifier( $self->name, 'before', $name, $code ); |
50dc6ee5 |
253 | } |
254 | |
255 | sub add_around_method_modifier { |
4859d490 |
256 | my ( $self, $name, $code ) = @_; |
257 | $self->_install_modifier( $self->name, 'around', $name, $code ); |
50dc6ee5 |
258 | } |
259 | |
260 | sub add_after_method_modifier { |
4859d490 |
261 | my ( $self, $name, $code ) = @_; |
262 | $self->_install_modifier( $self->name, 'after', $name, $code ); |
50dc6ee5 |
263 | } |
264 | |
67199842 |
265 | sub add_override_method_modifier { |
266 | my ($self, $name, $code) = @_; |
267 | |
268 | my $pkg = $self->name; |
269 | my $method = "${pkg}::${name}"; |
270 | |
271 | # Class::Method::Modifiers won't do this for us, so do it ourselves |
272 | |
273 | my $body = $pkg->can($name) |
fce211ae |
274 | or $self->throw_error("You cannot override '$method' because it has no super method"); |
67199842 |
275 | |
276 | no strict 'refs'; |
277 | *$method = sub { $code->($pkg, $body, @_) }; |
278 | } |
279 | |
47f36c05 |
280 | sub does_role { |
281 | my ($self, $role_name) = @_; |
ad958001 |
282 | |
47f36c05 |
283 | (defined $role_name) |
fce211ae |
284 | || $self->throw_error("You must supply a role name to look for"); |
ad958001 |
285 | |
f7fec86c |
286 | for my $class ($self->linearized_isa) { |
8536d351 |
287 | my $meta = Mouse::class_of($class); |
3a63a2e7 |
288 | next unless $meta && $meta->can('roles'); |
289 | |
290 | for my $role (@{ $meta->roles }) { |
291 | return 1 if $role->does_role($role_name); |
f7fec86c |
292 | } |
47f36c05 |
293 | } |
ad958001 |
294 | |
47f36c05 |
295 | return 0; |
296 | } |
297 | |
ae3edb8a |
298 | sub create { |
88ed7189 |
299 | my ($class, $package_name, %options) = @_; |
ae3edb8a |
300 | |
301 | (ref $options{superclasses} eq 'ARRAY') |
fce211ae |
302 | || $class->throw_error("You must pass an ARRAY ref of superclasses") |
ae3edb8a |
303 | if exists $options{superclasses}; |
ad958001 |
304 | |
ae3edb8a |
305 | (ref $options{attributes} eq 'ARRAY') |
fce211ae |
306 | || $class->throw_error("You must pass an ARRAY ref of attributes") |
ad958001 |
307 | if exists $options{attributes}; |
308 | |
ae3edb8a |
309 | (ref $options{methods} eq 'HASH') |
fce211ae |
310 | || $class->throw_error("You must pass a HASH ref of methods") |
ad958001 |
311 | if exists $options{methods}; |
ae3edb8a |
312 | |
313 | do { |
ae3edb8a |
314 | ( defined $package_name && $package_name ) |
fce211ae |
315 | || $class->throw_error("You must pass a package name"); |
ae3edb8a |
316 | |
317 | my $code = "package $package_name;"; |
318 | $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';" |
319 | if exists $options{version}; |
320 | $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';" |
321 | if exists $options{authority}; |
322 | |
323 | eval $code; |
fce211ae |
324 | $class->throw_error("creation of $package_name failed : $@") if $@; |
ae3edb8a |
325 | }; |
326 | |
dd3c04d7 |
327 | my %initialize_options = %options; |
328 | delete @initialize_options{qw( |
ae3edb8a |
329 | package |
330 | superclasses |
331 | attributes |
332 | methods |
333 | version |
334 | authority |
335 | )}; |
88ed7189 |
336 | my $meta = $class->initialize( $package_name => %initialize_options ); |
ae3edb8a |
337 | |
338 | # FIXME totally lame |
339 | $meta->add_method('meta' => sub { |
88ed7189 |
340 | Mouse::Meta::Class->initialize(ref($_[0]) || $_[0]); |
ae3edb8a |
341 | }); |
342 | |
343 | $meta->superclasses(@{$options{superclasses}}) |
344 | if exists $options{superclasses}; |
345 | # NOTE: |
346 | # process attributes first, so that they can |
347 | # install accessors, but locally defined methods |
348 | # can then overwrite them. It is maybe a little odd, but |
349 | # I think this should be the order of things. |
350 | if (exists $options{attributes}) { |
351 | foreach my $attr (@{$options{attributes}}) { |
352 | Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr); |
353 | } |
354 | } |
355 | if (exists $options{methods}) { |
356 | foreach my $method_name (keys %{$options{methods}}) { |
357 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
358 | } |
359 | } |
360 | return $meta; |
361 | } |
362 | |
363 | { |
364 | my $ANON_CLASS_SERIAL = 0; |
365 | my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::'; |
366 | sub create_anon_class { |
367 | my ( $class, %options ) = @_; |
368 | my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL; |
369 | return $class->create( $package_name, %options ); |
370 | } |
371 | } |
372 | |
c3398f5b |
373 | 1; |
374 | |
375 | __END__ |
376 | |
377 | =head1 NAME |
378 | |
306290e8 |
379 | Mouse::Meta::Class - hook into the Mouse MOP |
c3398f5b |
380 | |
381 | =head1 METHODS |
382 | |
306290e8 |
383 | =head2 initialize ClassName -> Mouse::Meta::Class |
c3398f5b |
384 | |
306290e8 |
385 | Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only |
386 | one instance should exist for a given class. |
c3398f5b |
387 | |
306290e8 |
388 | =head2 new %args -> Mouse::Meta::Class |
c3398f5b |
389 | |
306290e8 |
390 | Creates a new Mouse::Meta::Class. Don't call this directly. |
c3398f5b |
391 | |
392 | =head2 name -> ClassName |
393 | |
394 | Returns the name of the owner class. |
395 | |
396 | =head2 superclasses -> [ClassName] |
397 | |
398 | Gets (or sets) the list of superclasses of the owner class. |
399 | |
60f6eba9 |
400 | =head2 add_attribute (Mouse::Meta::Attribute| name => spec) |
c3398f5b |
401 | |
306290e8 |
402 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
403 | class. |
c3398f5b |
404 | |
d60824af |
405 | =head2 get_all_attributes -> (Mouse::Meta::Attribute) |
72b88a88 |
406 | |
407 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
408 | this class and its superclasses. |
409 | |
306290e8 |
410 | =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } |
c3398f5b |
411 | |
412 | Returns a mapping of attribute names to their corresponding |
306290e8 |
413 | L<Mouse::Meta::Attribute> objects. |
c3398f5b |
414 | |
c68b4110 |
415 | =head2 get_attribute_list -> { name => Mouse::Meta::Attribute } |
416 | |
417 | This returns a list of attribute names which are defined in the local |
418 | class. If you want a list of all applicable attributes for a class, |
d60824af |
419 | use the C<get_all_attributes> method. |
c68b4110 |
420 | |
cbc437f2 |
421 | =head2 has_attribute Name -> Bool |
66eea168 |
422 | |
423 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
424 | |
306290e8 |
425 | =head2 get_attribute Name -> Mouse::Meta::Attribute | undef |
c3398f5b |
426 | |
306290e8 |
427 | Returns the L<Mouse::Meta::Attribute> with the given name. |
c3398f5b |
428 | |
429 | =head2 linearized_isa -> [ClassNames] |
430 | |
431 | Returns the list of classes in method dispatch order, with duplicates removed. |
432 | |
f7b11a21 |
433 | =head2 clone_object Instance -> Instance |
434 | |
435 | Clones the given C<Instance> which must be an instance governed by this |
436 | metaclass. |
437 | |
438 | =head2 clone_instance Instance, Parameters -> Instance |
439 | |
518e303a |
440 | The clone_instance method has been made private. |
441 | The public version is deprecated. |
f7b11a21 |
442 | |
c3398f5b |
443 | =cut |
444 | |