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1 | package Mouse::Meta::Module; |
2 | use strict; |
3 | use warnings; |
4 | |
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5 | use Carp (); |
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6 | use Scalar::Util qw/blessed weaken/; |
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7 | |
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8 | use Mouse::Util qw/get_code_info not_supported load_class/; |
9 | |
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10 | { |
11 | my %METACLASS_CACHE; |
12 | |
13 | # because Mouse doesn't introspect existing classes, we're forced to |
14 | # only pay attention to other Mouse classes |
15 | sub _metaclass_cache { |
16 | my($class, $name) = @_; |
17 | return $METACLASS_CACHE{$name}; |
18 | } |
19 | |
20 | sub initialize { |
21 | my($class, $package_name, @args) = @_; |
22 | |
23 | ($package_name && !ref($package_name))\r |
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24 | || $class->throw_error("You must pass a package name and it cannot be blessed");\r |
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25 | |
26 | return $METACLASS_CACHE{$package_name} |
27 | ||= $class->_new(package => $package_name, @args); |
28 | } |
29 | |
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30 | sub class_of{ |
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31 | my($class_or_instance) = @_; |
32 | return undef unless defined $class_or_instance; |
33 | return $METACLASS_CACHE{ blessed($class_or_instance) || $class_or_instance }; |
34 | } |
35 | |
36 | # Means of accessing all the metaclasses that have |
37 | # been initialized thus far |
38 | sub get_all_metaclasses { %METACLASS_CACHE } |
39 | sub get_all_metaclass_instances { values %METACLASS_CACHE } |
40 | sub get_all_metaclass_names { keys %METACLASS_CACHE } |
41 | sub get_metaclass_by_name { $METACLASS_CACHE{$_[0]} } |
42 | sub store_metaclass_by_name { $METACLASS_CACHE{$_[0]} = $_[1] } |
43 | sub weaken_metaclass { weaken($METACLASS_CACHE{$_[0]}) } |
44 | sub does_metaclass_exist { defined $METACLASS_CACHE{$_[0]} } |
45 | sub remove_metaclass_by_name { delete $METACLASS_CACHE{$_[0]} } |
46 | |
47 | } |
48 | |
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49 | sub meta{ Mouse::Meta::Class->initialize(ref $_[0] || $_[0]) } |
50 | |
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51 | sub _new{ Carp::croak("Mouse::Meta::Module is an abstract class") } |
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52 | |
53 | sub name { $_[0]->{package} } |
54 | sub _method_map{ $_[0]->{methods} } |
55 | |
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56 | sub version { no strict 'refs'; ${shift->name.'::VERSION'} } |
57 | sub authority { no strict 'refs'; ${shift->name.'::AUTHORITY'} } |
58 | sub identifier { |
59 | my $self = shift; |
60 | return join '-' => ( |
61 | $self->name, |
62 | ($self->version || ()), |
63 | ($self->authority || ()), |
64 | ); |
65 | } |
66 | |
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67 | # add_attribute is an abstract method |
68 | |
69 | sub get_attribute_map { $_[0]->{attributes} } |
70 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
71 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
72 | sub get_attribute_list{ keys %{$_[0]->{attributes}} } |
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73 | sub remove_attribute { delete $_[0]->{attributes}->{$_[1]} } |
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74 | |
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75 | sub namespace{ |
76 | my $name = $_[0]->{package}; |
77 | no strict 'refs'; |
78 | return \%{ $name . '::' }; |
79 | } |
80 | |
81 | sub add_method { |
82 | my($self, $name, $code) = @_; |
83 | |
84 | if(!defined $name){ |
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85 | $self->throw_error("You must pass a defined name"); |
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86 | } |
87 | if(ref($code) ne 'CODE'){ |
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88 | not_supported 'add_method for a method object'; |
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89 | } |
90 | |
91 | $self->_method_map->{$name}++; # Moose stores meta object here. |
92 | |
93 | my $pkg = $self->name; |
94 | no strict 'refs'; |
95 | no warnings 'redefine'; |
96 | *{ $pkg . '::' . $name } = $code; |
97 | } |
98 | |
99 | sub _code_is_mine { # taken from Class::MOP::Class\r |
100 | my ( $self, $code ) = @_;\r |
101 | \r |
102 | my ( $code_package, $code_name ) = get_code_info($code);\r |
103 | \r |
104 | return $code_package && $code_package eq $self->name\r |
105 | || ( $code_package eq 'constant' && $code_name eq '__ANON__' );\r |
106 | } |
107 | |
108 | sub has_method { |
109 | my($self, $method_name) = @_; |
110 | |
111 | return 1 if $self->_method_map->{$method_name}; |
112 | my $code = $self->name->can($method_name); |
113 | |
114 | return $code && $self->_code_is_mine($code); |
115 | } |
116 | |
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117 | sub get_method{ |
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118 | my($self, $method_name) = @_; |
119 | |
120 | if($self->has_method($method_name)){ |
121 | my $method_metaclass = $self->method_metaclass; |
122 | load_class($method_metaclass); |
123 | |
124 | my $package = $self->name; |
125 | return $method_metaclass->new( |
126 | body => $package->can($method_name), |
127 | name => $method_name, |
128 | package => $package, |
129 | ); |
130 | } |
131 | |
132 | return undef; |
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133 | } |
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134 | |
135 | sub get_method_list {\r |
136 | my($self) = @_; |
137 | \r |
138 | return grep { $self->has_method($_) } keys %{ $self->namespace };\r |
139 | } |
140 | |
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141 | { |
142 | my $ANON_SERIAL = 0; |
143 | my $ANON_PREFIX = 'Mouse::Meta::Module::__ANON__::'; |
144 | |
145 | my %IMMORTALS; |
146 | |
147 | sub create { |
148 | my ($class, $package_name, %options) = @_; |
149 | |
150 | $class->throw_error('You must pass a package name') if @_ == 1; |
151 | |
152 | |
153 | if(exists $options{superclasses}){ |
154 | if($class->isa('Mouse::Meta::Class')){ |
155 | (ref $options{superclasses} eq 'ARRAY') |
156 | || $class->throw_error("You must pass an ARRAY ref of superclasses"); |
157 | } |
158 | else{ # role |
159 | delete $options{superclasses}; |
160 | } |
161 | } |
162 | |
163 | my $attributes; |
164 | if(exists $options{attributes}){ |
165 | $attributes = delete $options{attributes}; |
166 | (ref $attributes eq 'ARRAY' || ref $attributes eq 'HASH') |
167 | || $class->throw_error("You must pass an ARRAY ref of attributes") |
168 | } |
169 | |
170 | (ref $options{methods} eq 'HASH') |
171 | || $class->throw_error("You must pass a HASH ref of methods") |
172 | if exists $options{methods}; |
173 | |
174 | (ref $options{roles} eq 'ARRAY') |
175 | || $class->throw_error("You must pass an ARRAY ref of roles") |
176 | if exists $options{roles}; |
177 | |
178 | |
179 | my @extra_options; |
180 | my $mortal; |
181 | my $cache_key; |
182 | |
183 | if(!defined $package_name){ # anonymous |
184 | $mortal = !$options{cache}; |
185 | |
186 | # anonymous but immortal |
187 | if(!$mortal){ |
188 | # something like Super::Class|Super::Class::2=Role|Role::1\r |
189 | $cache_key = join '=' => (\r |
190 | join('|', @{$options{superclasses} || []}),\r |
191 | join('|', sort @{$options{roles} || []}),\r |
192 | ); |
193 | return $IMMORTALS{$cache_key} if exists $IMMORTALS{$cache_key}; |
194 | } |
195 | $package_name = $ANON_PREFIX . ++$ANON_SERIAL; |
196 | |
197 | push @extra_options, (anon_serial_id => $ANON_SERIAL); |
198 | } |
199 | |
200 | # instantiate a module |
201 | { |
202 | no strict 'refs'; |
203 | ${ $package_name . '::VERSION' } = delete $options{version} if exists $options{version}; |
204 | ${ $package_name . '::AUTHORITY' } = delete $options{authority} if exists $options{authority}; |
205 | } |
206 | |
207 | my %initialize_options = %options; |
208 | delete @initialize_options{qw( |
209 | package |
210 | superclasses |
211 | attributes |
212 | methods |
213 | roles |
214 | )}; |
215 | my $meta = $class->initialize( $package_name, %initialize_options, @extra_options); |
216 | |
217 | Mouse::Meta::Module::weaken_metaclass($package_name) |
218 | if $mortal; |
219 | |
220 | # FIXME totally lame |
221 | $meta->add_method('meta' => sub { |
222 | $class->initialize(ref($_[0]) || $_[0]); |
223 | }); |
224 | |
225 | $meta->superclasses(@{$options{superclasses}}) |
226 | if exists $options{superclasses}; |
227 | |
228 | # NOTE: |
229 | # process attributes first, so that they can |
230 | # install accessors, but locally defined methods |
231 | # can then overwrite them. It is maybe a little odd, but |
232 | # I think this should be the order of things. |
233 | if (defined $attributes) { |
234 | if(ref($attributes) eq 'ARRAY'){ |
235 | foreach my $attr (@{$attributes}) { |
236 | $meta->add_attribute($attr->{name} => $attr); |
237 | } |
238 | } |
239 | else{ |
240 | while(my($name, $attr) = each %{$attributes}){ |
241 | $meta->add_attribute($name => $attr); |
242 | } |
243 | } |
244 | } |
245 | if (exists $options{methods}) { |
246 | foreach my $method_name (keys %{$options{methods}}) { |
247 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
248 | } |
249 | } |
250 | if (exists $options{roles}){ |
251 | Mouse::Util::apply_all_roles($package_name, @{$options{roles}}); |
252 | } |
253 | |
254 | if(!$mortal && exists $meta->{anon_serial_id}){ |
255 | $IMMORTALS{$cache_key} = $meta; |
256 | } |
257 | |
258 | return $meta; |
259 | } |
260 | |
261 | sub DESTROY{ |
262 | my($self) = @_; |
263 | |
264 | my $serial_id = $self->{anon_serial_id}; |
265 | |
266 | return if !$serial_id; |
267 | |
268 | my $stash = $self->namespace; |
269 | |
270 | @{$self->{superclasses}} = () if exists $self->{superclasses}; |
271 | %{$stash} = (); |
272 | Mouse::Meta::Module::remove_metaclass_by_name($self->name); |
273 | |
274 | no strict 'refs'; |
275 | delete ${$ANON_PREFIX}{ $serial_id . '::' }; |
276 | |
277 | return; |
278 | } |
279 | } |
280 | |
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281 | sub throw_error{ |
282 | my($class, $message, %args) = @_; |
283 | |
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284 | local $Carp::CarpLevel = $Carp::CarpLevel + 1 + ($args{depth} || 0); |
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285 | local $Carp::MaxArgNums = 20; # default is 8, usually we use named args which gets messier though\r |
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286 | |
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287 | if(exists $args{longmess} && !$args{longmess}){ # intentionaly longmess => 0 |
288 | Carp::croak($message); |
289 | } |
290 | else{ |
291 | Carp::confess($message); |
292 | } |
293 | } |
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294 | |
295 | 1; |
296 | |
297 | __END__ |
298 | |
299 | =head1 NAME |
300 | |
301 | Mouse::Meta::Module - Common base class for Mouse::Meta::Class and Mouse::Meta::Role |
302 | |
303 | =cut |