Commit | Line | Data |
a2227e71 |
1 | package Mouse::Meta::Role; |
2 | use strict; |
3 | use warnings; |
59089ec3 |
4 | use Carp 'confess'; |
11d41528 |
5 | |
6 | use Mouse::Meta::Attribute; |
67199842 |
7 | use Mouse::Util qw(version authority identifier); |
a2227e71 |
8 | |
acf0f643 |
9 | do { |
10 | my %METACLASS_CACHE; |
11 | |
12 | # because Mouse doesn't introspect existing classes, we're forced to |
13 | # only pay attention to other Mouse classes |
14 | sub _metaclass_cache { |
15 | my $class = shift; |
16 | my $name = shift; |
17 | return $METACLASS_CACHE{$name}; |
18 | } |
19 | |
20 | sub initialize { |
21 | my $class = shift; |
22 | my $name = shift; |
23 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
24 | if !exists($METACLASS_CACHE{$name}); |
25 | return $METACLASS_CACHE{$name}; |
26 | } |
27 | }; |
28 | |
29 | sub new { |
30 | my $class = shift; |
31 | my %args = @_; |
32 | |
59089ec3 |
33 | $args{attributes} ||= {}; |
34 | $args{required_methods} ||= []; |
47f36c05 |
35 | $args{roles} ||= []; |
274b6cce |
36 | |
acf0f643 |
37 | bless \%args, $class; |
38 | } |
a2227e71 |
39 | |
513854c7 |
40 | sub name { $_[0]->{name} } |
41 | |
59089ec3 |
42 | sub add_required_methods { |
43 | my $self = shift; |
44 | my @methods = @_; |
45 | push @{$self->{required_methods}}, @methods; |
46 | } |
47 | |
67199842 |
48 | |
49 | |
274b6cce |
50 | sub add_attribute { |
51 | my $self = shift; |
52 | my $name = shift; |
69ac1dcf |
53 | my $spec = shift; |
11d41528 |
54 | $self->{attributes}->{$name} = Mouse::Meta::Attribute->new($name, %$spec); |
da0c885d |
55 | } |
56 | |
274b6cce |
57 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
58 | sub get_attribute_list { keys %{ $_[0]->{attributes} } } |
69ac1dcf |
59 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
274b6cce |
60 | |
2e92bb89 |
61 | # copied from Class::Inspector |
62 | sub get_method_list { |
63 | my $self = shift; |
64 | my $name = $self->name; |
65 | |
66 | no strict 'refs'; |
67 | # Get all the CODE symbol table entries |
8632b6fe |
68 | my @functions = |
3084f7a9 |
69 | grep !/^(?:has|with|around|before|after|augment|inner|override|super|blessed|extends|confess|excludes|meta|requires)$/, |
2e92bb89 |
70 | grep { defined &{"${name}::$_"} } |
71 | keys %{"${name}::"}; |
72 | wantarray ? @functions : \@functions; |
73 | } |
74 | |
e0b163e1 |
75 | # Moose uses Application::ToInstance, Application::ToClass, Application::ToRole |
da0c885d |
76 | sub apply { |
77 | my $self = shift; |
2e92bb89 |
78 | my $selfname = $self->name; |
da0c885d |
79 | my $class = shift; |
2e92bb89 |
80 | my $classname = $class->name; |
4aaa2ed6 |
81 | my %args = @_; |
da0c885d |
82 | |
e0b163e1 |
83 | if ($class->isa('Mouse::Object')) { |
84 | Carp::croak('Mouse does not support Application::ToInstance yet'); |
85 | } |
86 | |
4aaa2ed6 |
87 | if ($class->isa('Mouse::Meta::Class')) { |
88 | for my $name (@{$self->{required_methods}}) { |
89 | unless ($classname->can($name)) { |
90 | confess "'$selfname' requires the method '$name' to be implemented by '$classname'"; |
91 | } |
2e92bb89 |
92 | } |
93 | } |
94 | |
95 | { |
96 | no strict 'refs'; |
97 | for my $name ($self->get_method_list) { |
8632b6fe |
98 | next if $name eq 'meta'; |
21498b08 |
99 | |
67199842 |
100 | my $class_function = "${classname}::${name}"; |
101 | my $role_function = "${selfname}::${name}"; |
102 | if (defined &$class_function) { |
2e92bb89 |
103 | # XXX what's Moose's behavior? |
21498b08 |
104 | #next; |
105 | } else { |
e82cf08d |
106 | *{$class_function} = \&{$role_function}; |
21498b08 |
107 | } |
108 | if ($args{alias} && $args{alias}->{$name}) { |
109 | my $dstname = $args{alias}->{$name}; |
110 | unless ($classname->can($dstname)) { |
bded4514 |
111 | *{"${classname}::${dstname}"} = \&$role_function; |
21498b08 |
112 | } |
2e92bb89 |
113 | } |
59089ec3 |
114 | } |
115 | } |
116 | |
b1b81553 |
117 | if ($class->isa('Mouse::Meta::Class')) { |
118 | # apply role to class |
119 | for my $name ($self->get_attribute_list) { |
120 | next if $class->has_attribute($name); |
121 | my $spec = $self->get_attribute($name); |
05b9dc92 |
122 | |
123 | my $metaclass = 'Mouse::Meta::Attribute'; |
124 | if ( my $metaclass_name = $spec->{metaclass} ) { |
125 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
126 | 'Attribute', |
127 | $metaclass_name |
128 | ); |
129 | if ( $metaclass ne $new_class ) { |
130 | $metaclass = $new_class; |
131 | } |
132 | } |
133 | |
134 | $metaclass->create($class, $name, %$spec); |
b1b81553 |
135 | } |
136 | } else { |
137 | # apply role to role |
138 | # XXX Room for speed improvement |
139 | for my $name ($self->get_attribute_list) { |
140 | next if $class->has_attribute($name); |
141 | my $spec = $self->get_attribute($name); |
142 | $class->add_attribute($name, $spec); |
143 | } |
da0c885d |
144 | } |
d99db7b6 |
145 | |
b1b81553 |
146 | # XXX Room for speed improvement in role to role |
67199842 |
147 | for my $modifier_type (qw/before after around override/) { |
d99db7b6 |
148 | my $add_method = "add_${modifier_type}_method_modifier"; |
149 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
150 | |
151 | for my $method_name (keys %$modified) { |
152 | for my $code (@{ $modified->{$method_name} }) { |
153 | $class->$add_method($method_name => $code); |
154 | } |
155 | } |
156 | } |
47f36c05 |
157 | |
158 | # append roles |
159 | push @{ $class->roles }, $self, @{ $self->roles }; |
da0c885d |
160 | } |
0fc8adbc |
161 | |
21498b08 |
162 | sub combine_apply { |
163 | my(undef, $class, @roles) = @_; |
164 | my $classname = $class->name; |
165 | |
166 | if ($class->isa('Mouse::Meta::Class')) { |
167 | for my $role_spec (@roles) { |
168 | my $self = $role_spec->[0]->meta; |
169 | for my $name (@{$self->{required_methods}}) { |
170 | unless ($classname->can($name)) { |
171 | my $method_required = 0; |
172 | for my $role (@roles) { |
173 | $method_required = 1 if $self->name ne $role->[0] && $role->[0]->can($name); |
174 | } |
175 | confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'" |
176 | unless $method_required; |
177 | } |
178 | } |
179 | } |
180 | } |
181 | |
182 | { |
183 | no strict 'refs'; |
184 | for my $role_spec (@roles) { |
185 | my $self = $role_spec->[0]->meta; |
186 | my $selfname = $self->name; |
187 | my %args = %{ $role_spec->[1] }; |
188 | for my $name ($self->get_method_list) { |
8632b6fe |
189 | next if $name eq 'meta'; |
21498b08 |
190 | |
67199842 |
191 | my $class_function = "${classname}::${name}"; |
192 | my $role_function = "${selfname}::${name}"; |
193 | if (defined &$class_function) { |
21498b08 |
194 | # XXX what's Moose's behavior? |
195 | #next; |
196 | } else { |
67199842 |
197 | *$class_function = *$role_function; |
21498b08 |
198 | } |
199 | if ($args{alias} && $args{alias}->{$name}) { |
200 | my $dstname = $args{alias}->{$name}; |
201 | unless ($classname->can($dstname)) { |
bded4514 |
202 | *{"${classname}::${dstname}"} = \&$role_function; |
21498b08 |
203 | } |
204 | } |
205 | } |
206 | } |
207 | } |
208 | |
209 | |
210 | if ($class->isa('Mouse::Meta::Class')) { |
211 | # apply role to class |
212 | for my $role_spec (@roles) { |
213 | my $self = $role_spec->[0]->meta; |
214 | for my $name ($self->get_attribute_list) { |
215 | next if $class->has_attribute($name); |
216 | my $spec = $self->get_attribute($name); |
05b9dc92 |
217 | |
218 | my $metaclass = 'Mouse::Meta::Attribute'; |
219 | if ( my $metaclass_name = $spec->{metaclass} ) { |
220 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
221 | 'Attribute', |
222 | $metaclass_name |
223 | ); |
224 | if ( $metaclass ne $new_class ) { |
225 | $metaclass = $new_class; |
226 | } |
227 | } |
228 | |
229 | $metaclass->create($class, $name, %$spec); |
21498b08 |
230 | } |
231 | } |
232 | } else { |
233 | # apply role to role |
234 | # XXX Room for speed improvement |
235 | for my $role_spec (@roles) { |
236 | my $self = $role_spec->[0]->meta; |
237 | for my $name ($self->get_attribute_list) { |
238 | next if $class->has_attribute($name); |
239 | my $spec = $self->get_attribute($name); |
240 | $class->add_attribute($name, $spec); |
241 | } |
242 | } |
243 | } |
244 | |
245 | # XXX Room for speed improvement in role to role |
67199842 |
246 | for my $modifier_type (qw/before after around override/) { |
21498b08 |
247 | my $add_method = "add_${modifier_type}_method_modifier"; |
248 | for my $role_spec (@roles) { |
249 | my $self = $role_spec->[0]->meta; |
250 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
251 | |
252 | for my $method_name (keys %$modified) { |
253 | for my $code (@{ $modified->{$method_name} }) { |
254 | $class->$add_method($method_name => $code); |
255 | } |
256 | } |
257 | } |
258 | } |
259 | |
260 | # append roles |
261 | my %role_apply_cache; |
67199842 |
262 | my $apply_roles = $class->roles; |
21498b08 |
263 | for my $role_spec (@roles) { |
264 | my $self = $role_spec->[0]->meta; |
67199842 |
265 | push @$apply_roles, $self unless $role_apply_cache{$self}++; |
266 | for my $role (@{ $self->roles }) { |
267 | push @$apply_roles, $role unless $role_apply_cache{$role}++; |
21498b08 |
268 | } |
269 | } |
270 | } |
271 | |
67199842 |
272 | for my $modifier_type (qw/before after around override/) { |
c2f128e7 |
273 | no strict 'refs'; |
fc0e0bbd |
274 | *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub { |
275 | my ($self, $method_name, $method) = @_; |
276 | |
277 | push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} }, |
278 | $method; |
279 | }; |
280 | |
c2f128e7 |
281 | *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub { |
282 | my ($self, $method_name, $method) = @_; |
283 | @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] } |
284 | }; |
285 | } |
286 | |
47f36c05 |
287 | sub roles { $_[0]->{roles} } |
288 | |
67199842 |
289 | |
290 | # This is currently not passing all the Moose tests. |
291 | sub does_role { |
292 | my ($self, $role_name) = @_; |
293 | |
294 | (defined $role_name) |
295 | || confess "You must supply a role name to look for"; |
296 | |
297 | # if we are it,.. then return true |
298 | return 1 if $role_name eq $self->name; |
299 | |
300 | for my $role (@{ $self->{roles} }) { |
301 | return 1 if $role->does_role($role_name); |
302 | } |
303 | return 0; |
304 | } |
305 | |
306 | |
a2227e71 |
307 | 1; |
308 | |