Commit | Line | Data |
a2227e71 |
1 | package Mouse::Meta::Role; |
2 | use strict; |
3 | use warnings; |
59089ec3 |
4 | use Carp 'confess'; |
05b9dc92 |
5 | use Mouse::Util; |
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 | |
274b6cce |
46 | sub add_attribute { |
47 | my $self = shift; |
48 | my $name = shift; |
69ac1dcf |
49 | my $spec = shift; |
50 | $self->{attributes}->{$name} = $spec; |
da0c885d |
51 | } |
52 | |
274b6cce |
53 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
54 | sub get_attribute_list { keys %{ $_[0]->{attributes} } } |
69ac1dcf |
55 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
274b6cce |
56 | |
2e92bb89 |
57 | # copied from Class::Inspector |
58 | sub get_method_list { |
59 | my $self = shift; |
60 | my $name = $self->name; |
61 | |
62 | no strict 'refs'; |
63 | # Get all the CODE symbol table entries |
8632b6fe |
64 | my @functions = |
949ee85c |
65 | grep !/^(?:has|with|around|before|after|blessed|extends|confess|excludes|meta|requires)$/, |
2e92bb89 |
66 | grep { defined &{"${name}::$_"} } |
67 | keys %{"${name}::"}; |
68 | wantarray ? @functions : \@functions; |
69 | } |
70 | |
da0c885d |
71 | sub apply { |
72 | my $self = shift; |
2e92bb89 |
73 | my $selfname = $self->name; |
da0c885d |
74 | my $class = shift; |
2e92bb89 |
75 | my $classname = $class->name; |
4aaa2ed6 |
76 | my %args = @_; |
da0c885d |
77 | |
4aaa2ed6 |
78 | if ($class->isa('Mouse::Meta::Class')) { |
79 | for my $name (@{$self->{required_methods}}) { |
80 | unless ($classname->can($name)) { |
81 | confess "'$selfname' requires the method '$name' to be implemented by '$classname'"; |
82 | } |
2e92bb89 |
83 | } |
84 | } |
85 | |
86 | { |
87 | no strict 'refs'; |
88 | for my $name ($self->get_method_list) { |
8632b6fe |
89 | next if $name eq 'meta'; |
21498b08 |
90 | |
91 | if ($classname->can($name)) { |
2e92bb89 |
92 | # XXX what's Moose's behavior? |
21498b08 |
93 | #next; |
94 | } else { |
95 | *{"${classname}::${name}"} = *{"${selfname}::${name}"}; |
96 | } |
97 | if ($args{alias} && $args{alias}->{$name}) { |
98 | my $dstname = $args{alias}->{$name}; |
99 | unless ($classname->can($dstname)) { |
100 | *{"${classname}::${dstname}"} = *{"${selfname}::${name}"}; |
101 | } |
2e92bb89 |
102 | } |
59089ec3 |
103 | } |
104 | } |
105 | |
b1b81553 |
106 | if ($class->isa('Mouse::Meta::Class')) { |
107 | # apply role to class |
108 | for my $name ($self->get_attribute_list) { |
109 | next if $class->has_attribute($name); |
110 | my $spec = $self->get_attribute($name); |
05b9dc92 |
111 | |
112 | my $metaclass = 'Mouse::Meta::Attribute'; |
113 | if ( my $metaclass_name = $spec->{metaclass} ) { |
114 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
115 | 'Attribute', |
116 | $metaclass_name |
117 | ); |
118 | if ( $metaclass ne $new_class ) { |
119 | $metaclass = $new_class; |
120 | } |
121 | } |
122 | |
123 | $metaclass->create($class, $name, %$spec); |
b1b81553 |
124 | } |
125 | } else { |
126 | # apply role to role |
127 | # XXX Room for speed improvement |
128 | for my $name ($self->get_attribute_list) { |
129 | next if $class->has_attribute($name); |
130 | my $spec = $self->get_attribute($name); |
131 | $class->add_attribute($name, $spec); |
132 | } |
da0c885d |
133 | } |
d99db7b6 |
134 | |
b1b81553 |
135 | # XXX Room for speed improvement in role to role |
d99db7b6 |
136 | for my $modifier_type (qw/before after around/) { |
137 | my $add_method = "add_${modifier_type}_method_modifier"; |
138 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
139 | |
140 | for my $method_name (keys %$modified) { |
141 | for my $code (@{ $modified->{$method_name} }) { |
142 | $class->$add_method($method_name => $code); |
143 | } |
144 | } |
145 | } |
47f36c05 |
146 | |
147 | # append roles |
148 | push @{ $class->roles }, $self, @{ $self->roles }; |
da0c885d |
149 | } |
0fc8adbc |
150 | |
21498b08 |
151 | sub combine_apply { |
152 | my(undef, $class, @roles) = @_; |
153 | my $classname = $class->name; |
154 | |
155 | if ($class->isa('Mouse::Meta::Class')) { |
156 | for my $role_spec (@roles) { |
157 | my $self = $role_spec->[0]->meta; |
158 | for my $name (@{$self->{required_methods}}) { |
159 | unless ($classname->can($name)) { |
160 | my $method_required = 0; |
161 | for my $role (@roles) { |
162 | $method_required = 1 if $self->name ne $role->[0] && $role->[0]->can($name); |
163 | } |
164 | confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'" |
165 | unless $method_required; |
166 | } |
167 | } |
168 | } |
169 | } |
170 | |
171 | { |
172 | no strict 'refs'; |
173 | for my $role_spec (@roles) { |
174 | my $self = $role_spec->[0]->meta; |
175 | my $selfname = $self->name; |
176 | my %args = %{ $role_spec->[1] }; |
177 | for my $name ($self->get_method_list) { |
8632b6fe |
178 | next if $name eq 'meta'; |
21498b08 |
179 | |
180 | if ($classname->can($name)) { |
181 | # XXX what's Moose's behavior? |
182 | #next; |
183 | } else { |
184 | *{"${classname}::${name}"} = *{"${selfname}::${name}"}; |
185 | } |
186 | if ($args{alias} && $args{alias}->{$name}) { |
187 | my $dstname = $args{alias}->{$name}; |
188 | unless ($classname->can($dstname)) { |
189 | *{"${classname}::${dstname}"} = *{"${selfname}::${name}"}; |
190 | } |
191 | } |
192 | } |
193 | } |
194 | } |
195 | |
196 | |
197 | if ($class->isa('Mouse::Meta::Class')) { |
198 | # apply role to class |
199 | for my $role_spec (@roles) { |
200 | my $self = $role_spec->[0]->meta; |
201 | for my $name ($self->get_attribute_list) { |
202 | next if $class->has_attribute($name); |
203 | my $spec = $self->get_attribute($name); |
05b9dc92 |
204 | |
205 | my $metaclass = 'Mouse::Meta::Attribute'; |
206 | if ( my $metaclass_name = $spec->{metaclass} ) { |
207 | my $new_class = Mouse::Util::resolve_metaclass_alias( |
208 | 'Attribute', |
209 | $metaclass_name |
210 | ); |
211 | if ( $metaclass ne $new_class ) { |
212 | $metaclass = $new_class; |
213 | } |
214 | } |
215 | |
216 | $metaclass->create($class, $name, %$spec); |
21498b08 |
217 | } |
218 | } |
219 | } else { |
220 | # apply role to role |
221 | # XXX Room for speed improvement |
222 | for my $role_spec (@roles) { |
223 | my $self = $role_spec->[0]->meta; |
224 | for my $name ($self->get_attribute_list) { |
225 | next if $class->has_attribute($name); |
226 | my $spec = $self->get_attribute($name); |
227 | $class->add_attribute($name, $spec); |
228 | } |
229 | } |
230 | } |
231 | |
232 | # XXX Room for speed improvement in role to role |
233 | for my $modifier_type (qw/before after around/) { |
234 | my $add_method = "add_${modifier_type}_method_modifier"; |
235 | for my $role_spec (@roles) { |
236 | my $self = $role_spec->[0]->meta; |
237 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
238 | |
239 | for my $method_name (keys %$modified) { |
240 | for my $code (@{ $modified->{$method_name} }) { |
241 | $class->$add_method($method_name => $code); |
242 | } |
243 | } |
244 | } |
245 | } |
246 | |
247 | # append roles |
248 | my %role_apply_cache; |
249 | my @apply_roles; |
250 | for my $role_spec (@roles) { |
251 | my $self = $role_spec->[0]->meta; |
252 | push @apply_roles, $self unless $role_apply_cache{$self}++; |
253 | for my $role ($self->roles) { |
254 | push @apply_roles, $role unless $role_apply_cache{$role}++; |
255 | } |
256 | } |
257 | } |
258 | |
c2f128e7 |
259 | for my $modifier_type (qw/before after around/) { |
260 | no strict 'refs'; |
fc0e0bbd |
261 | *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub { |
262 | my ($self, $method_name, $method) = @_; |
263 | |
264 | push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} }, |
265 | $method; |
266 | }; |
267 | |
c2f128e7 |
268 | *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub { |
269 | my ($self, $method_name, $method) = @_; |
270 | @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] } |
271 | }; |
272 | } |
273 | |
47f36c05 |
274 | sub roles { $_[0]->{roles} } |
275 | |
a2227e71 |
276 | 1; |
277 | |