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