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a2227e71 |
1 | package Mouse::Meta::Role; |
2 | use strict; |
3 | use warnings; |
59089ec3 |
4 | use Carp 'confess'; |
67199842 |
5 | use Mouse::Util qw(version authority identifier); |
a2227e71 |
6 | |
acf0f643 |
7 | do { |
8 | my %METACLASS_CACHE; |
9 | |
10 | # because Mouse doesn't introspect existing classes, we're forced to |
11 | # only pay attention to other Mouse classes |
12 | sub _metaclass_cache { |
13 | my $class = shift; |
14 | my $name = shift; |
15 | return $METACLASS_CACHE{$name}; |
16 | } |
17 | |
18 | sub initialize { |
19 | my $class = shift; |
20 | my $name = shift; |
21 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
22 | if !exists($METACLASS_CACHE{$name}); |
23 | return $METACLASS_CACHE{$name}; |
24 | } |
25 | }; |
26 | |
27 | sub new { |
28 | my $class = shift; |
29 | my %args = @_; |
30 | |
59089ec3 |
31 | $args{attributes} ||= {}; |
32 | $args{required_methods} ||= []; |
47f36c05 |
33 | $args{roles} ||= []; |
274b6cce |
34 | |
acf0f643 |
35 | bless \%args, $class; |
36 | } |
a2227e71 |
37 | |
513854c7 |
38 | sub name { $_[0]->{name} } |
39 | |
59089ec3 |
40 | sub add_required_methods { |
41 | my $self = shift; |
42 | my @methods = @_; |
43 | push @{$self->{required_methods}}, @methods; |
44 | } |
45 | |
67199842 |
46 | |
47 | |
274b6cce |
48 | sub add_attribute { |
49 | my $self = shift; |
50 | my $name = shift; |
69ac1dcf |
51 | my $spec = shift; |
52 | $self->{attributes}->{$name} = $spec; |
da0c885d |
53 | } |
54 | |
274b6cce |
55 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
56 | sub get_attribute_list { keys %{ $_[0]->{attributes} } } |
69ac1dcf |
57 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
274b6cce |
58 | |
2e92bb89 |
59 | # copied from Class::Inspector |
60 | sub get_method_list { |
61 | my $self = shift; |
62 | my $name = $self->name; |
63 | |
64 | no strict 'refs'; |
65 | # Get all the CODE symbol table entries |
8632b6fe |
66 | my @functions = |
949ee85c |
67 | grep !/^(?:has|with|around|before|after|blessed|extends|confess|excludes|meta|requires)$/, |
2e92bb89 |
68 | grep { defined &{"${name}::$_"} } |
69 | keys %{"${name}::"}; |
70 | wantarray ? @functions : \@functions; |
71 | } |
72 | |
da0c885d |
73 | sub apply { |
74 | my $self = shift; |
2e92bb89 |
75 | my $selfname = $self->name; |
da0c885d |
76 | my $class = shift; |
2e92bb89 |
77 | my $classname = $class->name; |
4aaa2ed6 |
78 | my %args = @_; |
da0c885d |
79 | |
4aaa2ed6 |
80 | if ($class->isa('Mouse::Meta::Class')) { |
81 | for my $name (@{$self->{required_methods}}) { |
82 | unless ($classname->can($name)) { |
83 | confess "'$selfname' requires the method '$name' to be implemented by '$classname'"; |
84 | } |
2e92bb89 |
85 | } |
86 | } |
87 | |
88 | { |
89 | no strict 'refs'; |
90 | for my $name ($self->get_method_list) { |
8632b6fe |
91 | next if $name eq 'meta'; |
21498b08 |
92 | |
67199842 |
93 | my $class_function = "${classname}::${name}"; |
94 | my $role_function = "${selfname}::${name}"; |
95 | if (defined &$class_function) { |
2e92bb89 |
96 | # XXX what's Moose's behavior? |
21498b08 |
97 | #next; |
98 | } else { |
67199842 |
99 | *$class_function = *$role_function; |
21498b08 |
100 | } |
101 | if ($args{alias} && $args{alias}->{$name}) { |
102 | my $dstname = $args{alias}->{$name}; |
103 | unless ($classname->can($dstname)) { |
67199842 |
104 | *{"${classname}::${dstname}"} = *$role_function; |
21498b08 |
105 | } |
2e92bb89 |
106 | } |
59089ec3 |
107 | } |
108 | } |
109 | |
b1b81553 |
110 | if ($class->isa('Mouse::Meta::Class')) { |
111 | # apply role to class |
112 | for my $name ($self->get_attribute_list) { |
113 | next if $class->has_attribute($name); |
114 | my $spec = $self->get_attribute($name); |
05b9dc92 |
115 | |
116 | my $metaclass = 'Mouse::Meta::Attribute'; |
117 | if ( my $metaclass_name = $spec->{metaclass} ) { |
118 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
119 | 'Attribute', |
120 | $metaclass_name |
121 | ); |
122 | if ( $metaclass ne $new_class ) { |
123 | $metaclass = $new_class; |
124 | } |
125 | } |
126 | |
127 | $metaclass->create($class, $name, %$spec); |
b1b81553 |
128 | } |
129 | } else { |
130 | # apply role to role |
131 | # XXX Room for speed improvement |
132 | for my $name ($self->get_attribute_list) { |
133 | next if $class->has_attribute($name); |
134 | my $spec = $self->get_attribute($name); |
135 | $class->add_attribute($name, $spec); |
136 | } |
da0c885d |
137 | } |
d99db7b6 |
138 | |
b1b81553 |
139 | # XXX Room for speed improvement in role to role |
67199842 |
140 | for my $modifier_type (qw/before after around override/) { |
d99db7b6 |
141 | my $add_method = "add_${modifier_type}_method_modifier"; |
142 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
143 | |
144 | for my $method_name (keys %$modified) { |
145 | for my $code (@{ $modified->{$method_name} }) { |
146 | $class->$add_method($method_name => $code); |
147 | } |
148 | } |
149 | } |
47f36c05 |
150 | |
151 | # append roles |
152 | push @{ $class->roles }, $self, @{ $self->roles }; |
da0c885d |
153 | } |
0fc8adbc |
154 | |
21498b08 |
155 | sub combine_apply { |
156 | my(undef, $class, @roles) = @_; |
157 | my $classname = $class->name; |
158 | |
159 | if ($class->isa('Mouse::Meta::Class')) { |
160 | for my $role_spec (@roles) { |
161 | my $self = $role_spec->[0]->meta; |
162 | for my $name (@{$self->{required_methods}}) { |
163 | unless ($classname->can($name)) { |
164 | my $method_required = 0; |
165 | for my $role (@roles) { |
166 | $method_required = 1 if $self->name ne $role->[0] && $role->[0]->can($name); |
167 | } |
168 | confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'" |
169 | unless $method_required; |
170 | } |
171 | } |
172 | } |
173 | } |
174 | |
175 | { |
176 | no strict 'refs'; |
177 | for my $role_spec (@roles) { |
178 | my $self = $role_spec->[0]->meta; |
179 | my $selfname = $self->name; |
180 | my %args = %{ $role_spec->[1] }; |
181 | for my $name ($self->get_method_list) { |
8632b6fe |
182 | next if $name eq 'meta'; |
21498b08 |
183 | |
67199842 |
184 | my $class_function = "${classname}::${name}"; |
185 | my $role_function = "${selfname}::${name}"; |
186 | if (defined &$class_function) { |
21498b08 |
187 | # XXX what's Moose's behavior? |
188 | #next; |
189 | } else { |
67199842 |
190 | *$class_function = *$role_function; |
21498b08 |
191 | } |
192 | if ($args{alias} && $args{alias}->{$name}) { |
193 | my $dstname = $args{alias}->{$name}; |
194 | unless ($classname->can($dstname)) { |
67199842 |
195 | *{"${classname}::${dstname}"} = *$role_function; |
21498b08 |
196 | } |
197 | } |
198 | } |
199 | } |
200 | } |
201 | |
202 | |
203 | if ($class->isa('Mouse::Meta::Class')) { |
204 | # apply role to class |
205 | for my $role_spec (@roles) { |
206 | my $self = $role_spec->[0]->meta; |
207 | for my $name ($self->get_attribute_list) { |
208 | next if $class->has_attribute($name); |
209 | my $spec = $self->get_attribute($name); |
05b9dc92 |
210 | |
211 | my $metaclass = 'Mouse::Meta::Attribute'; |
212 | if ( my $metaclass_name = $spec->{metaclass} ) { |
213 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
214 | 'Attribute', |
215 | $metaclass_name |
216 | ); |
217 | if ( $metaclass ne $new_class ) { |
218 | $metaclass = $new_class; |
219 | } |
220 | } |
221 | |
222 | $metaclass->create($class, $name, %$spec); |
21498b08 |
223 | } |
224 | } |
225 | } else { |
226 | # apply role to role |
227 | # XXX Room for speed improvement |
228 | for my $role_spec (@roles) { |
229 | my $self = $role_spec->[0]->meta; |
230 | for my $name ($self->get_attribute_list) { |
231 | next if $class->has_attribute($name); |
232 | my $spec = $self->get_attribute($name); |
233 | $class->add_attribute($name, $spec); |
234 | } |
235 | } |
236 | } |
237 | |
238 | # XXX Room for speed improvement in role to role |
67199842 |
239 | for my $modifier_type (qw/before after around override/) { |
21498b08 |
240 | my $add_method = "add_${modifier_type}_method_modifier"; |
241 | for my $role_spec (@roles) { |
242 | my $self = $role_spec->[0]->meta; |
243 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
244 | |
245 | for my $method_name (keys %$modified) { |
246 | for my $code (@{ $modified->{$method_name} }) { |
247 | $class->$add_method($method_name => $code); |
248 | } |
249 | } |
250 | } |
251 | } |
252 | |
253 | # append roles |
254 | my %role_apply_cache; |
67199842 |
255 | my $apply_roles = $class->roles; |
21498b08 |
256 | for my $role_spec (@roles) { |
257 | my $self = $role_spec->[0]->meta; |
67199842 |
258 | push @$apply_roles, $self unless $role_apply_cache{$self}++; |
259 | for my $role (@{ $self->roles }) { |
260 | push @$apply_roles, $role unless $role_apply_cache{$role}++; |
21498b08 |
261 | } |
262 | } |
263 | } |
264 | |
67199842 |
265 | for my $modifier_type (qw/before after around override/) { |
c2f128e7 |
266 | no strict 'refs'; |
fc0e0bbd |
267 | *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub { |
268 | my ($self, $method_name, $method) = @_; |
269 | |
270 | push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} }, |
271 | $method; |
272 | }; |
273 | |
c2f128e7 |
274 | *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub { |
275 | my ($self, $method_name, $method) = @_; |
276 | @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] } |
277 | }; |
278 | } |
279 | |
47f36c05 |
280 | sub roles { $_[0]->{roles} } |
281 | |
67199842 |
282 | |
283 | # This is currently not passing all the Moose tests. |
284 | sub does_role { |
285 | my ($self, $role_name) = @_; |
286 | |
287 | (defined $role_name) |
288 | || confess "You must supply a role name to look for"; |
289 | |
290 | # if we are it,.. then return true |
291 | return 1 if $role_name eq $self->name; |
292 | |
293 | for my $role (@{ $self->{roles} }) { |
294 | return 1 if $role->does_role($role_name); |
295 | } |
296 | return 0; |
297 | } |
298 | |
299 | |
a2227e71 |
300 | 1; |
301 | |