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