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; |
6c169c50 |
7 | use Scalar::Util qw/blessed/; |
67199842 |
8 | use Mouse::Util qw/get_linear_isa version authority identifier/; |
7a59f4e8 |
9 | use Carp 'confess'; |
72b88a88 |
10 | |
c3398f5b |
11 | do { |
12 | my %METACLASS_CACHE; |
72b88a88 |
13 | |
14 | # because Mouse doesn't introspect existing classes, we're forced to |
15 | # only pay attention to other Mouse classes |
16 | sub _metaclass_cache { |
17 | my $class = shift; |
18 | my $name = shift; |
19 | return $METACLASS_CACHE{$name}; |
20 | } |
21 | |
c3398f5b |
22 | sub initialize { |
67199842 |
23 | my $class = blessed($_[0]) || $_[0]; |
24 | my $name = $_[1]; |
25 | |
c3398f5b |
26 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
27 | if !exists($METACLASS_CACHE{$name}); |
28 | return $METACLASS_CACHE{$name}; |
29 | } |
30 | }; |
31 | |
32 | sub new { |
33 | my $class = shift; |
6cbacbf6 |
34 | my %args = @_; |
c3398f5b |
35 | |
36 | $args{attributes} = {}; |
37 | $args{superclasses} = do { |
38 | no strict 'refs'; |
39 | \@{ $args{name} . '::ISA' }; |
40 | }; |
47f36c05 |
41 | $args{roles} ||= []; |
c3398f5b |
42 | |
43 | bless \%args, $class; |
44 | } |
45 | |
46 | sub name { $_[0]->{name} } |
47 | |
48 | sub superclasses { |
49 | my $self = shift; |
50 | |
51 | if (@_) { |
52 | Mouse::load_class($_) for @_; |
53 | @{ $self->{superclasses} } = @_; |
54 | } |
55 | |
56 | @{ $self->{superclasses} }; |
57 | } |
58 | |
d16fe7d7 |
59 | sub add_method { |
60 | my $self = shift; |
61 | my $name = shift; |
62 | my $code = shift; |
63 | |
64 | my $pkg = $self->name; |
65 | |
66 | no strict 'refs'; |
47b5feb9 |
67 | no warnings 'redefine'; |
8632b6fe |
68 | $self->{'methods'}->{$name}++; # Moose stores meta object here. |
d16fe7d7 |
69 | *{ $pkg . '::' . $name } = $code; |
70 | } |
71 | |
2e92bb89 |
72 | # copied from Class::Inspector |
4724d42e |
73 | my $get_methods_for_class = sub { |
2e92bb89 |
74 | my $self = shift; |
4724d42e |
75 | my $name = shift; |
2e92bb89 |
76 | |
77 | no strict 'refs'; |
78 | # Get all the CODE symbol table entries |
8632b6fe |
79 | my @functions = |
67199842 |
80 | grep !/^(?:has|with|around|before|after|augment|inner|blessed|extends|confess|override|super)$/, |
2e92bb89 |
81 | grep { defined &{"${name}::$_"} } |
82 | keys %{"${name}::"}; |
4724d42e |
83 | push @functions, keys %{$self->{'methods'}->{$name}} if $self; |
2e92bb89 |
84 | wantarray ? @functions : \@functions; |
4724d42e |
85 | }; |
86 | |
87 | sub get_method_list { |
88 | my $self = shift; |
89 | $get_methods_for_class->($self, $self->name); |
2e92bb89 |
90 | } |
91 | |
60cfc6ad |
92 | sub get_all_method_names { |
93 | my $self = shift; |
94 | my %uniq; |
95 | return grep { $uniq{$_}++ == 0 } |
96 | map { $get_methods_for_class->(undef, $_) } |
97 | $self->linearized_isa; |
98 | } |
99 | |
c3398f5b |
100 | sub add_attribute { |
101 | my $self = shift; |
c3398f5b |
102 | |
60f6eba9 |
103 | if (@_ == 1 && blessed($_[0])) { |
104 | my $attr = shift @_; |
105 | $self->{'attributes'}{$attr->name} = $attr; |
106 | } else { |
107 | my $names = shift @_; |
108 | $names = [$names] if !ref($names); |
109 | my $metaclass = 'Mouse::Meta::Attribute'; |
110 | my %options = @_; |
111 | |
112 | if ( my $metaclass_name = delete $options{metaclass} ) { |
113 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
114 | 'Attribute', |
115 | $metaclass_name |
116 | ); |
117 | if ( $metaclass ne $new_class ) { |
118 | $metaclass = $new_class; |
119 | } |
120 | } |
121 | |
122 | for my $name (@$names) { |
123 | if ($name =~ s/^\+//) { |
124 | $metaclass->clone_parent($self, $name, @_); |
125 | } |
126 | else { |
127 | $metaclass->create($self, $name, @_); |
128 | } |
129 | } |
130 | } |
c3398f5b |
131 | } |
132 | |
72b88a88 |
133 | sub compute_all_applicable_attributes { |
134 | my $self = shift; |
135 | my (@attr, %seen); |
136 | |
137 | for my $class ($self->linearized_isa) { |
138 | my $meta = $self->_metaclass_cache($class) |
139 | or next; |
140 | |
141 | for my $name (keys %{ $meta->get_attribute_map }) { |
142 | next if $seen{$name}++; |
143 | push @attr, $meta->get_attribute($name); |
144 | } |
145 | } |
146 | |
147 | return @attr; |
148 | } |
149 | |
c3398f5b |
150 | sub get_attribute_map { $_[0]->{attributes} } |
66eea168 |
151 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
c3398f5b |
152 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
153 | |
00ca1c62 |
154 | sub linearized_isa { @{ get_linear_isa($_[0]->name) } } |
c3398f5b |
155 | |
7a59f4e8 |
156 | sub clone_object { |
157 | my $class = shift; |
158 | my $instance = shift; |
159 | |
160 | (blessed($instance) && $instance->isa($class->name)) |
1a0f0802 |
161 | || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"; |
7a59f4e8 |
162 | |
163 | $class->clone_instance($instance, @_); |
164 | } |
165 | |
166 | sub clone_instance { |
167 | my ($class, $instance, %params) = @_; |
168 | |
169 | (blessed($instance)) |
e42bee44 |
170 | || confess "You can only clone instances, ($instance) is not a blessed instance"; |
7a59f4e8 |
171 | |
172 | my $clone = bless { %$instance }, ref $instance; |
173 | |
174 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
175 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
176 | if (exists $params{$init_arg}) { |
177 | $clone->{ $attr->name } = $params{$init_arg}; |
178 | } |
179 | } |
180 | } |
181 | |
182 | return $clone; |
183 | |
184 | } |
185 | |
fc1d8369 |
186 | sub make_immutable { |
187 | my $self = shift; |
6a1d1835 |
188 | my %args = ( |
189 | inline_constructor => 1, |
190 | @_, |
191 | ); |
192 | |
fc1d8369 |
193 | my $name = $self->name; |
194 | $self->{is_immutable}++; |
c7a6403f |
195 | |
6a1d1835 |
196 | if ($args{inline_constructor}) { |
c7a6403f |
197 | $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self )); |
198 | } |
199 | |
8632b6fe |
200 | if ($args{inline_destructor}) { |
201 | $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self )); |
202 | } |
2276cb14 |
203 | |
204 | # Moose's make_immutable returns true allowing calling code to skip setting an explicit true value |
205 | # at the end of a source file. |
206 | return 1; |
fc1d8369 |
207 | } |
ad958001 |
208 | |
209 | sub make_mutable { confess "Mouse does not currently support 'make_mutable'" } |
210 | |
fc1d8369 |
211 | sub is_immutable { $_[0]->{is_immutable} } |
84ef660f |
212 | |
213 | sub attribute_metaclass { "Mouse::Meta::Class" } |
7a59f4e8 |
214 | |
4859d490 |
215 | sub _install_modifier { |
216 | my ( $self, $into, $type, $name, $code ) = @_; |
4f5b44a0 |
217 | |
218 | # which is modifer class available? |
219 | my $modifier_class = do { |
220 | if (eval "require Class::Method::Modifiers::Fast; 1") { |
221 | 'Class::Method::Modifiers::Fast'; |
222 | } elsif (eval "require Class::Method::Modifiers; 1") { |
223 | 'Class::Method::Modifiers'; |
224 | } else { |
225 | 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."); |
226 | } |
227 | }; |
228 | my $modifier = $modifier_class->can('_install_modifier'); |
229 | |
230 | # replace this method itself :) |
231 | { |
232 | no strict 'refs'; |
233 | no warnings 'redefine'; |
234 | *{__PACKAGE__ . '::_install_modifier'} = sub { |
235 | my ( $self, $into, $type, $name, $code ) = @_; |
236 | $modifier->( |
237 | $into, |
238 | $type, |
239 | $name, |
240 | $code |
241 | ); |
242 | }; |
1b79a118 |
243 | } |
4f5b44a0 |
244 | |
245 | # call me. for first time. |
246 | $self->_install_modifier( $into, $type, $name, $code ); |
4859d490 |
247 | } |
248 | |
50dc6ee5 |
249 | sub add_before_method_modifier { |
4859d490 |
250 | my ( $self, $name, $code ) = @_; |
251 | $self->_install_modifier( $self->name, 'before', $name, $code ); |
50dc6ee5 |
252 | } |
253 | |
254 | sub add_around_method_modifier { |
4859d490 |
255 | my ( $self, $name, $code ) = @_; |
256 | $self->_install_modifier( $self->name, 'around', $name, $code ); |
50dc6ee5 |
257 | } |
258 | |
259 | sub add_after_method_modifier { |
4859d490 |
260 | my ( $self, $name, $code ) = @_; |
261 | $self->_install_modifier( $self->name, 'after', $name, $code ); |
50dc6ee5 |
262 | } |
263 | |
67199842 |
264 | sub add_override_method_modifier { |
265 | my ($self, $name, $code) = @_; |
266 | |
267 | my $pkg = $self->name; |
268 | my $method = "${pkg}::${name}"; |
269 | |
270 | # Class::Method::Modifiers won't do this for us, so do it ourselves |
271 | |
272 | my $body = $pkg->can($name) |
273 | or confess "You cannot override '$method' because it has no super method"; |
274 | |
275 | no strict 'refs'; |
276 | *$method = sub { $code->($pkg, $body, @_) }; |
277 | } |
278 | |
279 | |
47f36c05 |
280 | sub roles { $_[0]->{roles} } |
281 | |
282 | sub does_role { |
283 | my ($self, $role_name) = @_; |
ad958001 |
284 | |
47f36c05 |
285 | (defined $role_name) |
286 | || confess "You must supply a role name to look for"; |
ad958001 |
287 | |
47f36c05 |
288 | for my $role (@{ $self->{roles} }) { |
289 | return 1 if $role->name eq $role_name; |
290 | } |
ad958001 |
291 | |
47f36c05 |
292 | return 0; |
293 | } |
294 | |
ae3edb8a |
295 | sub create { |
1a72f15c |
296 | my ($self, $package_name, %options) = @_; |
ae3edb8a |
297 | |
298 | (ref $options{superclasses} eq 'ARRAY') |
299 | || confess "You must pass an ARRAY ref of superclasses" |
300 | if exists $options{superclasses}; |
ad958001 |
301 | |
ae3edb8a |
302 | (ref $options{attributes} eq 'ARRAY') |
303 | || confess "You must pass an ARRAY ref of attributes" |
ad958001 |
304 | if exists $options{attributes}; |
305 | |
ae3edb8a |
306 | (ref $options{methods} eq 'HASH') |
307 | || confess "You must pass a HASH ref of methods" |
ad958001 |
308 | if exists $options{methods}; |
ae3edb8a |
309 | |
310 | do { |
ae3edb8a |
311 | ( defined $package_name && $package_name ) |
312 | || confess "You must pass a package name"; |
313 | |
314 | my $code = "package $package_name;"; |
315 | $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';" |
316 | if exists $options{version}; |
317 | $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';" |
318 | if exists $options{authority}; |
319 | |
320 | eval $code; |
321 | confess "creation of $package_name failed : $@" if $@; |
322 | }; |
323 | |
dd3c04d7 |
324 | my %initialize_options = %options; |
325 | delete @initialize_options{qw( |
ae3edb8a |
326 | package |
327 | superclasses |
328 | attributes |
329 | methods |
330 | version |
331 | authority |
332 | )}; |
dd3c04d7 |
333 | my $meta = $self->initialize( $package_name => %initialize_options ); |
ae3edb8a |
334 | |
335 | # FIXME totally lame |
336 | $meta->add_method('meta' => sub { |
1a72f15c |
337 | $self->initialize(ref($_[0]) || $_[0]); |
ae3edb8a |
338 | }); |
339 | |
340 | $meta->superclasses(@{$options{superclasses}}) |
341 | if exists $options{superclasses}; |
342 | # NOTE: |
343 | # process attributes first, so that they can |
344 | # install accessors, but locally defined methods |
345 | # can then overwrite them. It is maybe a little odd, but |
346 | # I think this should be the order of things. |
347 | if (exists $options{attributes}) { |
348 | foreach my $attr (@{$options{attributes}}) { |
349 | Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr); |
350 | } |
351 | } |
352 | if (exists $options{methods}) { |
353 | foreach my $method_name (keys %{$options{methods}}) { |
354 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
355 | } |
356 | } |
357 | return $meta; |
358 | } |
359 | |
360 | { |
361 | my $ANON_CLASS_SERIAL = 0; |
362 | my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::'; |
363 | sub create_anon_class { |
364 | my ( $class, %options ) = @_; |
365 | my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL; |
366 | return $class->create( $package_name, %options ); |
367 | } |
368 | } |
369 | |
c3398f5b |
370 | 1; |
371 | |
372 | __END__ |
373 | |
374 | =head1 NAME |
375 | |
306290e8 |
376 | Mouse::Meta::Class - hook into the Mouse MOP |
c3398f5b |
377 | |
378 | =head1 METHODS |
379 | |
306290e8 |
380 | =head2 initialize ClassName -> Mouse::Meta::Class |
c3398f5b |
381 | |
306290e8 |
382 | Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only |
383 | one instance should exist for a given class. |
c3398f5b |
384 | |
306290e8 |
385 | =head2 new %args -> Mouse::Meta::Class |
c3398f5b |
386 | |
306290e8 |
387 | Creates a new Mouse::Meta::Class. Don't call this directly. |
c3398f5b |
388 | |
389 | =head2 name -> ClassName |
390 | |
391 | Returns the name of the owner class. |
392 | |
393 | =head2 superclasses -> [ClassName] |
394 | |
395 | Gets (or sets) the list of superclasses of the owner class. |
396 | |
60f6eba9 |
397 | =head2 add_attribute (Mouse::Meta::Attribute| name => spec) |
c3398f5b |
398 | |
306290e8 |
399 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
400 | class. |
c3398f5b |
401 | |
72b88a88 |
402 | =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) |
403 | |
404 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
405 | this class and its superclasses. |
406 | |
306290e8 |
407 | =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } |
c3398f5b |
408 | |
409 | Returns a mapping of attribute names to their corresponding |
306290e8 |
410 | L<Mouse::Meta::Attribute> objects. |
c3398f5b |
411 | |
cbc437f2 |
412 | =head2 has_attribute Name -> Bool |
66eea168 |
413 | |
414 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
415 | |
306290e8 |
416 | =head2 get_attribute Name -> Mouse::Meta::Attribute | undef |
c3398f5b |
417 | |
306290e8 |
418 | Returns the L<Mouse::Meta::Attribute> with the given name. |
c3398f5b |
419 | |
420 | =head2 linearized_isa -> [ClassNames] |
421 | |
422 | Returns the list of classes in method dispatch order, with duplicates removed. |
423 | |
f7b11a21 |
424 | =head2 clone_object Instance -> Instance |
425 | |
426 | Clones the given C<Instance> which must be an instance governed by this |
427 | metaclass. |
428 | |
429 | =head2 clone_instance Instance, Parameters -> Instance |
430 | |
431 | Clones the given C<Instance> and sets any additional parameters. |
432 | |
c3398f5b |
433 | =cut |
434 | |