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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, $package_name, @args) = @_; |
22 | |
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23 | ($package_name && !ref($package_name)) |
24 | || $class->throw_error("You must pass a package name and it cannot be blessed"); |
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25 | |
26 | return $METACLASS_CACHE{$package_name} |
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27 | ||= $class->_construct_meta(package => $package_name, @args); |
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28 | } |
29 | |
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30 | sub class_of{ |
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31 | my($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} } |
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54 | |
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55 | sub version { no strict 'refs'; ${shift->name.'::VERSION'} } |
56 | sub authority { no strict 'refs'; ${shift->name.'::AUTHORITY'} } |
57 | sub identifier { |
58 | my $self = shift; |
59 | return join '-' => ( |
60 | $self->name, |
61 | ($self->version || ()), |
62 | ($self->authority || ()), |
63 | ); |
64 | } |
65 | |
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66 | # add_attribute is an abstract method |
67 | |
68 | sub get_attribute_map { $_[0]->{attributes} } |
69 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
70 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
71 | sub get_attribute_list{ keys %{$_[0]->{attributes}} } |
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72 | sub remove_attribute { delete $_[0]->{attributes}->{$_[1]} } |
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73 | |
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74 | sub namespace{ |
75 | my $name = $_[0]->{package}; |
76 | no strict 'refs'; |
77 | return \%{ $name . '::' }; |
78 | } |
79 | |
80 | sub add_method { |
81 | my($self, $name, $code) = @_; |
82 | |
83 | if(!defined $name){ |
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84 | $self->throw_error('You must pass a defined name'); |
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85 | } |
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86 | if(!defined $code){ |
87 | $self->throw_error('You must pass a defined code'); |
88 | } |
89 | |
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90 | if(ref($code) ne 'CODE'){ |
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91 | not_supported 'add_method for a method object'; |
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92 | } |
93 | |
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94 | $self->{methods}->{$name}++; # Moose stores meta object here. |
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95 | |
96 | my $pkg = $self->name; |
97 | no strict 'refs'; |
98 | no warnings 'redefine'; |
99 | *{ $pkg . '::' . $name } = $code; |
100 | } |
101 | |
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102 | sub _code_is_mine { # taken from Class::MOP::Class |
103 | my ( $self, $code ) = @_; |
104 | |
105 | my ( $code_package, $code_name ) = get_code_info($code); |
106 | |
107 | return $code_package && $code_package eq $self->name |
108 | || ( $code_package eq 'constant' && $code_name eq '__ANON__' ); |
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109 | } |
110 | |
111 | sub has_method { |
112 | my($self, $method_name) = @_; |
113 | |
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114 | return 1 if $self->{methods}->{$method_name}; |
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115 | my $code = $self->name->can($method_name); |
116 | |
117 | return $code && $self->_code_is_mine($code); |
118 | } |
119 | |
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120 | sub get_method{ |
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121 | my($self, $method_name) = @_; |
122 | |
123 | if($self->has_method($method_name)){ |
124 | my $method_metaclass = $self->method_metaclass; |
125 | load_class($method_metaclass); |
126 | |
127 | my $package = $self->name; |
128 | return $method_metaclass->new( |
129 | body => $package->can($method_name), |
130 | name => $method_name, |
131 | package => $package, |
132 | ); |
133 | } |
134 | |
135 | return undef; |
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136 | } |
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137 | |
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138 | sub get_method_list { |
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139 | my($self) = @_; |
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140 | |
141 | return grep { $self->has_method($_) } keys %{ $self->namespace }; |
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142 | } |
143 | |
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144 | { |
145 | my $ANON_SERIAL = 0; |
146 | my $ANON_PREFIX = 'Mouse::Meta::Module::__ANON__::'; |
147 | |
148 | my %IMMORTALS; |
149 | |
150 | sub create { |
151 | my ($class, $package_name, %options) = @_; |
152 | |
153 | $class->throw_error('You must pass a package name') if @_ == 1; |
154 | |
155 | |
156 | if(exists $options{superclasses}){ |
157 | if($class->isa('Mouse::Meta::Class')){ |
158 | (ref $options{superclasses} eq 'ARRAY') |
159 | || $class->throw_error("You must pass an ARRAY ref of superclasses"); |
160 | } |
161 | else{ # role |
162 | delete $options{superclasses}; |
163 | } |
164 | } |
165 | |
166 | my $attributes; |
167 | if(exists $options{attributes}){ |
168 | $attributes = delete $options{attributes}; |
169 | (ref $attributes eq 'ARRAY' || ref $attributes eq 'HASH') |
170 | || $class->throw_error("You must pass an ARRAY ref of attributes") |
171 | } |
172 | |
173 | (ref $options{methods} eq 'HASH') |
174 | || $class->throw_error("You must pass a HASH ref of methods") |
175 | if exists $options{methods}; |
176 | |
177 | (ref $options{roles} eq 'ARRAY') |
178 | || $class->throw_error("You must pass an ARRAY ref of roles") |
179 | if exists $options{roles}; |
180 | |
181 | |
182 | my @extra_options; |
183 | my $mortal; |
184 | my $cache_key; |
185 | |
186 | if(!defined $package_name){ # anonymous |
187 | $mortal = !$options{cache}; |
188 | |
189 | # anonymous but immortal |
190 | if(!$mortal){ |
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191 | # something like Super::Class|Super::Class::2=Role|Role::1 |
192 | $cache_key = join '=' => ( |
193 | join('|', @{$options{superclasses} || []}), |
194 | join('|', sort @{$options{roles} || []}), |
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195 | ); |
196 | return $IMMORTALS{$cache_key} if exists $IMMORTALS{$cache_key}; |
197 | } |
198 | $package_name = $ANON_PREFIX . ++$ANON_SERIAL; |
199 | |
200 | push @extra_options, (anon_serial_id => $ANON_SERIAL); |
201 | } |
202 | |
203 | # instantiate a module |
204 | { |
205 | no strict 'refs'; |
206 | ${ $package_name . '::VERSION' } = delete $options{version} if exists $options{version}; |
207 | ${ $package_name . '::AUTHORITY' } = delete $options{authority} if exists $options{authority}; |
208 | } |
209 | |
210 | my %initialize_options = %options; |
211 | delete @initialize_options{qw( |
212 | package |
213 | superclasses |
214 | attributes |
215 | methods |
216 | roles |
217 | )}; |
218 | my $meta = $class->initialize( $package_name, %initialize_options, @extra_options); |
219 | |
220 | Mouse::Meta::Module::weaken_metaclass($package_name) |
221 | if $mortal; |
222 | |
223 | # FIXME totally lame |
224 | $meta->add_method('meta' => sub { |
225 | $class->initialize(ref($_[0]) || $_[0]); |
226 | }); |
227 | |
228 | $meta->superclasses(@{$options{superclasses}}) |
229 | if exists $options{superclasses}; |
230 | |
231 | # NOTE: |
232 | # process attributes first, so that they can |
233 | # install accessors, but locally defined methods |
234 | # can then overwrite them. It is maybe a little odd, but |
235 | # I think this should be the order of things. |
236 | if (defined $attributes) { |
237 | if(ref($attributes) eq 'ARRAY'){ |
238 | foreach my $attr (@{$attributes}) { |
239 | $meta->add_attribute($attr->{name} => $attr); |
240 | } |
241 | } |
242 | else{ |
243 | while(my($name, $attr) = each %{$attributes}){ |
244 | $meta->add_attribute($name => $attr); |
245 | } |
246 | } |
247 | } |
248 | if (exists $options{methods}) { |
249 | foreach my $method_name (keys %{$options{methods}}) { |
250 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
251 | } |
252 | } |
253 | if (exists $options{roles}){ |
254 | Mouse::Util::apply_all_roles($package_name, @{$options{roles}}); |
255 | } |
256 | |
257 | if(!$mortal && exists $meta->{anon_serial_id}){ |
258 | $IMMORTALS{$cache_key} = $meta; |
259 | } |
260 | |
261 | return $meta; |
262 | } |
263 | |
264 | sub DESTROY{ |
265 | my($self) = @_; |
266 | |
267 | my $serial_id = $self->{anon_serial_id}; |
268 | |
269 | return if !$serial_id; |
270 | |
271 | my $stash = $self->namespace; |
272 | |
273 | @{$self->{superclasses}} = () if exists $self->{superclasses}; |
274 | %{$stash} = (); |
275 | Mouse::Meta::Module::remove_metaclass_by_name($self->name); |
276 | |
277 | no strict 'refs'; |
278 | delete ${$ANON_PREFIX}{ $serial_id . '::' }; |
279 | |
280 | return; |
281 | } |
282 | } |
283 | |
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284 | sub throw_error{ |
285 | my($class, $message, %args) = @_; |
286 | |
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287 | local $Carp::CarpLevel = $Carp::CarpLevel + 1 + ($args{depth} || 0); |
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288 | local $Carp::MaxArgNums = 20; # default is 8, usually we use named args which gets messier though |
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289 | |
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290 | if(exists $args{longmess} && !$args{longmess}){ # intentionaly longmess => 0 |
291 | Carp::croak($message); |
292 | } |
293 | else{ |
294 | Carp::confess($message); |
295 | } |
296 | } |
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297 | |
298 | 1; |
299 | |
300 | __END__ |
301 | |
302 | =head1 NAME |
303 | |
304 | Mouse::Meta::Module - Common base class for Mouse::Meta::Class and Mouse::Meta::Role |
305 | |
306 | =cut |