Commit | Line | Data |
3fea05b9 |
1 | package Mouse::Meta::Module; |
2 | use Mouse::Util qw/:meta get_code_package get_code_ref load_class not_supported/; # enables strict and warnings |
3 | |
4 | use Carp (); |
5 | use Scalar::Util (); |
6 | |
7 | my %METAS; |
8 | |
9 | # XXX: work around a warning "useless use of a constant in void context" in 5.6.2 |
10 | if(&Mouse::Util::MOUSE_XS){ |
11 | # register meta storage for performance |
12 | Mouse::Util::__register_metaclass_storage(\%METAS, 0); |
13 | |
14 | # ensure thread safety |
15 | *CLONE = sub { Mouse::Util::__register_metaclass_storage(\%METAS, 1) }; |
16 | } |
17 | |
18 | sub _metaclass_cache { # DEPRECATED |
19 | my($class, $name) = @_; |
20 | return $METAS{$name}; |
21 | } |
22 | |
23 | sub initialize { |
24 | my($class, $package_name, @args) = @_; |
25 | |
26 | ($package_name && !ref($package_name)) |
27 | || $class->throw_error("You must pass a package name and it cannot be blessed"); |
28 | |
29 | return $METAS{$package_name} |
30 | ||= $class->_construct_meta(package => $package_name, @args); |
31 | } |
32 | |
33 | sub reinitialize { |
34 | my($class, $package_name, @args) = @_; |
35 | |
36 | $package_name = $package_name->name if ref $package_name; |
37 | |
38 | ($package_name && !ref($package_name)) |
39 | || $class->throw_error("You must pass a package name and it cannot be blessed"); |
40 | |
41 | delete $METAS{$package_name}; |
42 | return $class->initialize($package_name, @args); |
43 | } |
44 | |
45 | sub _class_of{ |
46 | my($class_or_instance) = @_; |
47 | return undef unless defined $class_or_instance; |
48 | return $METAS{ ref($class_or_instance) || $class_or_instance }; |
49 | } |
50 | |
51 | # Means of accessing all the metaclasses that have |
52 | # been initialized thus far |
53 | #sub _get_all_metaclasses { %METAS } |
54 | sub _get_all_metaclass_instances { values %METAS } |
55 | sub _get_all_metaclass_names { keys %METAS } |
56 | sub _get_metaclass_by_name { $METAS{$_[0]} } |
57 | #sub _store_metaclass_by_name { $METAS{$_[0]} = $_[1] } |
58 | #sub _weaken_metaclass { weaken($METAS{$_[0]}) } |
59 | #sub _does_metaclass_exist { defined $METAS{$_[0]} } |
60 | #sub _remove_metaclass_by_name { delete $METAS{$_[0]} } |
61 | |
62 | sub name; |
63 | |
64 | sub namespace; |
65 | |
66 | # The followings are Class::MOP specific methods |
67 | |
68 | #sub version { no strict 'refs'; ${shift->name.'::VERSION'} } |
69 | #sub authority { no strict 'refs'; ${shift->name.'::AUTHORITY'} } |
70 | #sub identifier { |
71 | # my $self = shift; |
72 | # return join '-' => ( |
73 | # $self->name, |
74 | # ($self->version || ()), |
75 | # ($self->authority || ()), |
76 | # ); |
77 | #} |
78 | |
79 | # add_attribute is an abstract method |
80 | |
81 | sub get_attribute_map { # DEPRECATED |
82 | Carp::cluck('get_attribute_map() has been deprecated'); |
83 | return $_[0]->{attributes}; |
84 | } |
85 | |
86 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
87 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
88 | sub remove_attribute { delete $_[0]->{attributes}->{$_[1]} } |
89 | |
90 | sub get_attribute_list{ keys %{$_[0]->{attributes}} } |
91 | |
92 | # XXX: for backward compatibility |
93 | my %foreign = map{ $_ => undef } qw( |
94 | Mouse Mouse::Role Mouse::Util Mouse::Util::TypeConstraints |
95 | Carp Scalar::Util List::Util |
96 | ); |
97 | sub _code_is_mine{ |
98 | # my($self, $code) = @_; |
99 | |
100 | return !exists $foreign{ get_code_package($_[1]) }; |
101 | } |
102 | |
103 | sub add_method; |
104 | |
105 | sub has_method { |
106 | my($self, $method_name) = @_; |
107 | |
108 | defined($method_name) |
109 | or $self->throw_error('You must define a method name'); |
110 | |
111 | return defined($self->{methods}{$method_name}) || do{ |
112 | my $code = get_code_ref($self->{package}, $method_name); |
113 | $code && $self->_code_is_mine($code); |
114 | }; |
115 | } |
116 | |
117 | sub get_method_body { |
118 | my($self, $method_name) = @_; |
119 | |
120 | defined($method_name) |
121 | or $self->throw_error('You must define a method name'); |
122 | |
123 | return $self->{methods}{$method_name} ||= do{ |
124 | my $code = get_code_ref($self->{package}, $method_name); |
125 | $code && $self->_code_is_mine($code) ? $code : undef; |
126 | }; |
127 | } |
128 | |
129 | sub get_method{ |
130 | my($self, $method_name) = @_; |
131 | |
132 | if(my $code = $self->get_method_body($method_name)){ |
133 | my $method_metaclass = $self->method_metaclass; |
134 | load_class($method_metaclass); |
135 | |
136 | return $method_metaclass->wrap( |
137 | body => $code, |
138 | name => $method_name, |
139 | package => $self->name, |
140 | associated_metaclass => $self, |
141 | ); |
142 | } |
143 | |
144 | return undef; |
145 | } |
146 | |
147 | sub get_method_list { |
148 | my($self) = @_; |
149 | |
150 | return grep { $self->has_method($_) } keys %{ $self->namespace }; |
151 | } |
152 | |
153 | { |
154 | my $ANON_SERIAL = 0; |
155 | |
156 | my %IMMORTALS; |
157 | |
158 | sub create { |
159 | my($self, $package_name, %options) = @_; |
160 | |
161 | my $class = ref($self) || $self; |
162 | $self->throw_error('You must pass a package name') if @_ < 2; |
163 | |
164 | my $superclasses; |
165 | if(exists $options{superclasses}){ |
166 | if(Mouse::Util::is_a_metarole($self)){ |
167 | delete $options{superclasses}; |
168 | } |
169 | else{ |
170 | $superclasses = delete $options{superclasses}; |
171 | (ref $superclasses eq 'ARRAY') |
172 | || $self->throw_error("You must pass an ARRAY ref of superclasses"); |
173 | } |
174 | } |
175 | |
176 | my $attributes = delete $options{attributes}; |
177 | if(defined $attributes){ |
178 | (ref $attributes eq 'ARRAY' || ref $attributes eq 'HASH') |
179 | || $self->throw_error("You must pass an ARRAY ref of attributes"); |
180 | } |
181 | my $methods = delete $options{methods}; |
182 | if(defined $methods){ |
183 | (ref $methods eq 'HASH') |
184 | || $self->throw_error("You must pass a HASH ref of methods"); |
185 | } |
186 | my $roles = delete $options{roles}; |
187 | if(defined $roles){ |
188 | (ref $roles eq 'ARRAY') |
189 | || $self->throw_error("You must pass an ARRAY ref of roles"); |
190 | } |
191 | my $mortal; |
192 | my $cache_key; |
193 | |
194 | if(!defined $package_name){ # anonymous |
195 | $mortal = !$options{cache}; |
196 | |
197 | # anonymous but immortal |
198 | if(!$mortal){ |
199 | # something like Super::Class|Super::Class::2=Role|Role::1 |
200 | $cache_key = join '=' => ( |
201 | join('|', @{$superclasses || []}), |
202 | join('|', sort @{$roles || []}), |
203 | ); |
204 | return $IMMORTALS{$cache_key} if exists $IMMORTALS{$cache_key}; |
205 | } |
206 | $options{anon_serial_id} = ++$ANON_SERIAL; |
207 | $package_name = $class . '::__ANON__::' . $ANON_SERIAL; |
208 | } |
209 | |
210 | # instantiate a module |
211 | { |
212 | no strict 'refs'; |
213 | ${ $package_name . '::VERSION' } = delete $options{version} if exists $options{version}; |
214 | ${ $package_name . '::AUTHORITY' } = delete $options{authority} if exists $options{authority}; |
215 | } |
216 | |
217 | my $meta = $self->initialize( $package_name, %options); |
218 | |
219 | Scalar::Util::weaken $METAS{$package_name} |
220 | if $mortal; |
221 | |
222 | $meta->add_method(meta => sub{ |
223 | $self->initialize(ref($_[0]) || $_[0]); |
224 | }); |
225 | |
226 | $meta->superclasses(@{$superclasses}) |
227 | if defined $superclasses; |
228 | |
229 | # NOTE: |
230 | # process attributes first, so that they can |
231 | # install accessors, but locally defined methods |
232 | # can then overwrite them. It is maybe a little odd, but |
233 | # I think this should be the order of things. |
234 | if (defined $attributes) { |
235 | if(ref($attributes) eq 'ARRAY'){ |
236 | # array of Mouse::Meta::Attribute |
237 | foreach my $attr (@{$attributes}) { |
238 | $meta->add_attribute($attr); |
239 | } |
240 | } |
241 | else{ |
242 | # hash map of name and attribute spec pairs |
243 | while(my($name, $attr) = each %{$attributes}){ |
244 | $meta->add_attribute($name => $attr); |
245 | } |
246 | } |
247 | } |
248 | if (defined $methods) { |
249 | while(my($method_name, $method_body) = each %{$methods}){ |
250 | $meta->add_method($method_name, $method_body); |
251 | } |
252 | } |
253 | if (defined $roles){ |
254 | Mouse::Util::apply_all_roles($package_name, @{$roles}); |
255 | } |
256 | |
257 | if($cache_key){ |
258 | $IMMORTALS{$cache_key} = $meta; |
259 | } |
260 | |
261 | return $meta; |
262 | } |
263 | |
264 | sub DESTROY{ |
265 | my($self) = @_; |
266 | |
267 | return if $Mouse::Util::in_global_destruction; |
268 | |
269 | my $serial_id = $self->{anon_serial_id}; |
270 | |
271 | return if !$serial_id; |
272 | |
273 | # @ISA is a magical variable, so we clear it manually. |
274 | @{$self->{superclasses}} = () if exists $self->{superclasses}; |
275 | |
276 | # Then, clear the symbol table hash |
277 | %{$self->namespace} = (); |
278 | |
279 | my $name = $self->name; |
280 | delete $METAS{$name}; |
281 | |
282 | $name =~ s/ $serial_id \z//xms; |
283 | |
284 | no strict 'refs'; |
285 | delete ${$name}{ $serial_id . '::' }; |
286 | |
287 | return; |
288 | } |
289 | } |
290 | |
291 | sub throw_error{ |
292 | my($class, $message, %args) = @_; |
293 | |
294 | local $Carp::CarpLevel = $Carp::CarpLevel + 1 + ($args{depth} || 0); |
295 | local $Carp::MaxArgNums = 20; # default is 8, usually we use named args which gets messier though |
296 | |
297 | if(exists $args{longmess} && !$args{longmess}){ # intentionaly longmess => 0 |
298 | Carp::croak($message); |
299 | } |
300 | else{ |
301 | Carp::confess($message); |
302 | } |
303 | } |
304 | |
305 | 1; |
306 | __END__ |
307 | |
308 | =head1 NAME |
309 | |
310 | Mouse::Meta::Module - The base class for Mouse::Meta::Class and Mouse::Meta::Role |
311 | |
312 | =head1 VERSION |
313 | |
314 | This document describes Mouse version 0.43 |
315 | |
316 | =head1 SEE ALSO |
317 | |
318 | L<Class::MOP::Class> |
319 | |
320 | L<Class::MOP::Module> |
321 | |
322 | L<Class::MOP::Package> |
323 | |
324 | =cut |
325 | |