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/; |
8 | use Mouse::Util qw/get_linear_isa/; |
7a59f4e8 |
9 | use Carp 'confess'; |
72b88a88 |
10 | |
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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 { |
23 | my $class = shift; |
24 | my $name = shift; |
25 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
26 | if !exists($METACLASS_CACHE{$name}); |
27 | return $METACLASS_CACHE{$name}; |
28 | } |
29 | }; |
30 | |
31 | sub new { |
32 | my $class = shift; |
6cbacbf6 |
33 | my %args = @_; |
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34 | |
35 | $args{attributes} = {}; |
36 | $args{superclasses} = do { |
37 | no strict 'refs'; |
38 | \@{ $args{name} . '::ISA' }; |
39 | }; |
47f36c05 |
40 | $args{roles} ||= []; |
c3398f5b |
41 | |
42 | bless \%args, $class; |
43 | } |
44 | |
45 | sub name { $_[0]->{name} } |
46 | |
47 | sub superclasses { |
48 | my $self = shift; |
49 | |
50 | if (@_) { |
51 | Mouse::load_class($_) for @_; |
52 | @{ $self->{superclasses} } = @_; |
53 | } |
54 | |
55 | @{ $self->{superclasses} }; |
56 | } |
57 | |
d16fe7d7 |
58 | sub add_method { |
59 | my $self = shift; |
60 | my $name = shift; |
61 | my $code = shift; |
62 | |
63 | my $pkg = $self->name; |
64 | |
65 | no strict 'refs'; |
47b5feb9 |
66 | no warnings 'redefine'; |
8632b6fe |
67 | $self->{'methods'}->{$name}++; # Moose stores meta object here. |
d16fe7d7 |
68 | *{ $pkg . '::' . $name } = $code; |
69 | } |
70 | |
2e92bb89 |
71 | # copied from Class::Inspector |
4724d42e |
72 | my $get_methods_for_class = sub { |
2e92bb89 |
73 | my $self = shift; |
4724d42e |
74 | my $name = shift; |
2e92bb89 |
75 | |
76 | no strict 'refs'; |
77 | # Get all the CODE symbol table entries |
8632b6fe |
78 | my @functions = |
478cab2c |
79 | grep !/^(?:has|with|around|before|after|blessed|extends|confess|override|super)$/, |
2e92bb89 |
80 | grep { defined &{"${name}::$_"} } |
81 | keys %{"${name}::"}; |
4724d42e |
82 | push @functions, keys %{$self->{'methods'}->{$name}} if $self; |
2e92bb89 |
83 | wantarray ? @functions : \@functions; |
4724d42e |
84 | }; |
85 | |
86 | sub get_method_list { |
87 | my $self = shift; |
88 | $get_methods_for_class->($self, $self->name); |
2e92bb89 |
89 | } |
90 | |
c3398f5b |
91 | sub add_attribute { |
92 | my $self = shift; |
93 | my $attr = shift; |
94 | |
95 | $self->{'attributes'}{$attr->name} = $attr; |
96 | } |
97 | |
72b88a88 |
98 | sub compute_all_applicable_attributes { |
99 | my $self = shift; |
100 | my (@attr, %seen); |
101 | |
102 | for my $class ($self->linearized_isa) { |
103 | my $meta = $self->_metaclass_cache($class) |
104 | or next; |
105 | |
106 | for my $name (keys %{ $meta->get_attribute_map }) { |
107 | next if $seen{$name}++; |
108 | push @attr, $meta->get_attribute($name); |
109 | } |
110 | } |
111 | |
112 | return @attr; |
113 | } |
114 | |
c3398f5b |
115 | sub get_attribute_map { $_[0]->{attributes} } |
66eea168 |
116 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
c3398f5b |
117 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
118 | |
00ca1c62 |
119 | sub linearized_isa { @{ get_linear_isa($_[0]->name) } } |
c3398f5b |
120 | |
7a59f4e8 |
121 | sub clone_object { |
122 | my $class = shift; |
123 | my $instance = shift; |
124 | |
125 | (blessed($instance) && $instance->isa($class->name)) |
1a0f0802 |
126 | || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"; |
7a59f4e8 |
127 | |
128 | $class->clone_instance($instance, @_); |
129 | } |
130 | |
131 | sub clone_instance { |
132 | my ($class, $instance, %params) = @_; |
133 | |
134 | (blessed($instance)) |
e42bee44 |
135 | || confess "You can only clone instances, ($instance) is not a blessed instance"; |
7a59f4e8 |
136 | |
137 | my $clone = bless { %$instance }, ref $instance; |
138 | |
139 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
140 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
141 | if (exists $params{$init_arg}) { |
142 | $clone->{ $attr->name } = $params{$init_arg}; |
143 | } |
144 | } |
145 | } |
146 | |
147 | return $clone; |
148 | |
149 | } |
150 | |
fc1d8369 |
151 | sub make_immutable { |
152 | my $self = shift; |
6a1d1835 |
153 | my %args = ( |
154 | inline_constructor => 1, |
155 | @_, |
156 | ); |
157 | |
fc1d8369 |
158 | my $name = $self->name; |
159 | $self->{is_immutable}++; |
c7a6403f |
160 | |
6a1d1835 |
161 | if ($args{inline_constructor}) { |
c7a6403f |
162 | $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self )); |
163 | } |
164 | |
8632b6fe |
165 | if ($args{inline_destructor}) { |
166 | $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self )); |
167 | } |
fc1d8369 |
168 | } |
ad958001 |
169 | |
170 | sub make_mutable { confess "Mouse does not currently support 'make_mutable'" } |
171 | |
fc1d8369 |
172 | sub is_immutable { $_[0]->{is_immutable} } |
84ef660f |
173 | |
174 | sub attribute_metaclass { "Mouse::Meta::Class" } |
7a59f4e8 |
175 | |
4859d490 |
176 | sub _install_modifier { |
177 | my ( $self, $into, $type, $name, $code ) = @_; |
fa9a3caa |
178 | if (eval "require Class::Method::Modifiers::Fast; 1") { |
179 | Class::Method::Modifiers::Fast::_install_modifier( |
4859d490 |
180 | $into, |
181 | $type, |
182 | $name, |
183 | $code |
184 | ); |
185 | } |
186 | else { |
187 | require Class::Method::Modifiers; |
188 | Class::Method::Modifiers::_install_modifier( |
189 | $into, |
190 | $type, |
191 | $name, |
192 | $code |
193 | ); |
194 | } |
195 | } |
196 | |
50dc6ee5 |
197 | sub add_before_method_modifier { |
4859d490 |
198 | my ( $self, $name, $code ) = @_; |
199 | $self->_install_modifier( $self->name, 'before', $name, $code ); |
50dc6ee5 |
200 | } |
201 | |
202 | sub add_around_method_modifier { |
4859d490 |
203 | my ( $self, $name, $code ) = @_; |
204 | $self->_install_modifier( $self->name, 'around', $name, $code ); |
50dc6ee5 |
205 | } |
206 | |
207 | sub add_after_method_modifier { |
4859d490 |
208 | my ( $self, $name, $code ) = @_; |
209 | $self->_install_modifier( $self->name, 'after', $name, $code ); |
50dc6ee5 |
210 | } |
211 | |
47f36c05 |
212 | sub roles { $_[0]->{roles} } |
213 | |
214 | sub does_role { |
215 | my ($self, $role_name) = @_; |
ad958001 |
216 | |
47f36c05 |
217 | (defined $role_name) |
218 | || confess "You must supply a role name to look for"; |
ad958001 |
219 | |
47f36c05 |
220 | for my $role (@{ $self->{roles} }) { |
221 | return 1 if $role->name eq $role_name; |
222 | } |
ad958001 |
223 | |
47f36c05 |
224 | return 0; |
225 | } |
226 | |
ae3edb8a |
227 | sub create { |
1a72f15c |
228 | my ($self, $package_name, %options) = @_; |
ae3edb8a |
229 | |
230 | (ref $options{superclasses} eq 'ARRAY') |
231 | || confess "You must pass an ARRAY ref of superclasses" |
232 | if exists $options{superclasses}; |
ad958001 |
233 | |
ae3edb8a |
234 | (ref $options{attributes} eq 'ARRAY') |
235 | || confess "You must pass an ARRAY ref of attributes" |
ad958001 |
236 | if exists $options{attributes}; |
237 | |
ae3edb8a |
238 | (ref $options{methods} eq 'HASH') |
239 | || confess "You must pass a HASH ref of methods" |
ad958001 |
240 | if exists $options{methods}; |
ae3edb8a |
241 | |
242 | do { |
ae3edb8a |
243 | ( defined $package_name && $package_name ) |
244 | || confess "You must pass a package name"; |
245 | |
246 | my $code = "package $package_name;"; |
247 | $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';" |
248 | if exists $options{version}; |
249 | $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';" |
250 | if exists $options{authority}; |
251 | |
252 | eval $code; |
253 | confess "creation of $package_name failed : $@" if $@; |
254 | }; |
255 | |
dd3c04d7 |
256 | my %initialize_options = %options; |
257 | delete @initialize_options{qw( |
ae3edb8a |
258 | package |
259 | superclasses |
260 | attributes |
261 | methods |
262 | version |
263 | authority |
264 | )}; |
dd3c04d7 |
265 | my $meta = $self->initialize( $package_name => %initialize_options ); |
ae3edb8a |
266 | |
267 | # FIXME totally lame |
268 | $meta->add_method('meta' => sub { |
1a72f15c |
269 | $self->initialize(ref($_[0]) || $_[0]); |
ae3edb8a |
270 | }); |
271 | |
272 | $meta->superclasses(@{$options{superclasses}}) |
273 | if exists $options{superclasses}; |
274 | # NOTE: |
275 | # process attributes first, so that they can |
276 | # install accessors, but locally defined methods |
277 | # can then overwrite them. It is maybe a little odd, but |
278 | # I think this should be the order of things. |
279 | if (exists $options{attributes}) { |
280 | foreach my $attr (@{$options{attributes}}) { |
281 | Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr); |
282 | } |
283 | } |
284 | if (exists $options{methods}) { |
285 | foreach my $method_name (keys %{$options{methods}}) { |
286 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
287 | } |
288 | } |
289 | return $meta; |
290 | } |
291 | |
292 | { |
293 | my $ANON_CLASS_SERIAL = 0; |
294 | my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::'; |
295 | sub create_anon_class { |
296 | my ( $class, %options ) = @_; |
297 | my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL; |
298 | return $class->create( $package_name, %options ); |
299 | } |
300 | } |
301 | |
c3398f5b |
302 | 1; |
303 | |
304 | __END__ |
305 | |
306 | =head1 NAME |
307 | |
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308 | Mouse::Meta::Class - hook into the Mouse MOP |
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309 | |
310 | =head1 METHODS |
311 | |
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312 | =head2 initialize ClassName -> Mouse::Meta::Class |
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313 | |
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314 | Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only |
315 | one instance should exist for a given class. |
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316 | |
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317 | =head2 new %args -> Mouse::Meta::Class |
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318 | |
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319 | Creates a new Mouse::Meta::Class. Don't call this directly. |
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320 | |
321 | =head2 name -> ClassName |
322 | |
323 | Returns the name of the owner class. |
324 | |
325 | =head2 superclasses -> [ClassName] |
326 | |
327 | Gets (or sets) the list of superclasses of the owner class. |
328 | |
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329 | =head2 add_attribute Mouse::Meta::Attribute |
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330 | |
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331 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
332 | class. |
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333 | |
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334 | =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) |
335 | |
336 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
337 | this class and its superclasses. |
338 | |
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339 | =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } |
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340 | |
341 | Returns a mapping of attribute names to their corresponding |
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342 | L<Mouse::Meta::Attribute> objects. |
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343 | |
cbc437f2 |
344 | =head2 has_attribute Name -> Bool |
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345 | |
346 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
347 | |
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348 | =head2 get_attribute Name -> Mouse::Meta::Attribute | undef |
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349 | |
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350 | Returns the L<Mouse::Meta::Attribute> with the given name. |
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351 | |
352 | =head2 linearized_isa -> [ClassNames] |
353 | |
354 | Returns the list of classes in method dispatch order, with duplicates removed. |
355 | |
f7b11a21 |
356 | =head2 clone_object Instance -> Instance |
357 | |
358 | Clones the given C<Instance> which must be an instance governed by this |
359 | metaclass. |
360 | |
361 | =head2 clone_instance Instance, Parameters -> Instance |
362 | |
363 | Clones the given C<Instance> and sets any additional parameters. |
364 | |
c3398f5b |
365 | =cut |
366 | |