Commit | Line | Data |
a2227e71 |
1 | #!/usr/bin/env perl |
2 | package Mouse::Meta::Role; |
3 | use strict; |
4 | use warnings; |
59089ec3 |
5 | use Carp 'confess'; |
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 = $self->name; |
61 | |
62 | no strict 'refs'; |
63 | # Get all the CODE symbol table entries |
64 | my @functions = grep !/^meta$/, |
65 | grep { /\A[^\W\d]\w*\z/o } |
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) { |
89 | next if $name eq 'has' || $name eq 'requires' || $name eq 'meta' || $name eq 'with' || $name eq 'around' || $name eq 'before' || $name eq 'after' || $name eq 'blessed' || $name eq 'extends' || $name eq 'confess' || $name eq 'excludes'; |
21498b08 |
90 | |
91 | if ($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); |
111 | Mouse::Meta::Attribute->create($class, $name, %$spec); |
112 | } |
113 | } else { |
114 | # apply role to role |
115 | # XXX Room for speed improvement |
116 | for my $name ($self->get_attribute_list) { |
117 | next if $class->has_attribute($name); |
118 | my $spec = $self->get_attribute($name); |
119 | $class->add_attribute($name, $spec); |
120 | } |
da0c885d |
121 | } |
d99db7b6 |
122 | |
b1b81553 |
123 | # XXX Room for speed improvement in role to role |
d99db7b6 |
124 | for my $modifier_type (qw/before after around/) { |
125 | my $add_method = "add_${modifier_type}_method_modifier"; |
126 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
127 | |
128 | for my $method_name (keys %$modified) { |
129 | for my $code (@{ $modified->{$method_name} }) { |
130 | $class->$add_method($method_name => $code); |
131 | } |
132 | } |
133 | } |
47f36c05 |
134 | |
135 | # append roles |
136 | push @{ $class->roles }, $self, @{ $self->roles }; |
da0c885d |
137 | } |
0fc8adbc |
138 | |
21498b08 |
139 | sub combine_apply { |
140 | my(undef, $class, @roles) = @_; |
141 | my $classname = $class->name; |
142 | |
143 | if ($class->isa('Mouse::Meta::Class')) { |
144 | for my $role_spec (@roles) { |
145 | my $self = $role_spec->[0]->meta; |
146 | for my $name (@{$self->{required_methods}}) { |
147 | unless ($classname->can($name)) { |
148 | my $method_required = 0; |
149 | for my $role (@roles) { |
150 | $method_required = 1 if $self->name ne $role->[0] && $role->[0]->can($name); |
151 | } |
152 | confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'" |
153 | unless $method_required; |
154 | } |
155 | } |
156 | } |
157 | } |
158 | |
159 | { |
160 | no strict 'refs'; |
161 | for my $role_spec (@roles) { |
162 | my $self = $role_spec->[0]->meta; |
163 | my $selfname = $self->name; |
164 | my %args = %{ $role_spec->[1] }; |
165 | for my $name ($self->get_method_list) { |
166 | next if $name eq 'has' || $name eq 'requires' || $name eq 'meta' || $name eq 'with' || $name eq 'around' || $name eq 'before' || $name eq 'after' || $name eq 'blessed' || $name eq 'extends' || $name eq 'confess' || $name eq 'excludes'; |
167 | |
168 | if ($classname->can($name)) { |
169 | # XXX what's Moose's behavior? |
170 | #next; |
171 | } else { |
172 | *{"${classname}::${name}"} = *{"${selfname}::${name}"}; |
173 | } |
174 | if ($args{alias} && $args{alias}->{$name}) { |
175 | my $dstname = $args{alias}->{$name}; |
176 | unless ($classname->can($dstname)) { |
177 | *{"${classname}::${dstname}"} = *{"${selfname}::${name}"}; |
178 | } |
179 | } |
180 | } |
181 | } |
182 | } |
183 | |
184 | |
185 | if ($class->isa('Mouse::Meta::Class')) { |
186 | # apply role to class |
187 | for my $role_spec (@roles) { |
188 | my $self = $role_spec->[0]->meta; |
189 | for my $name ($self->get_attribute_list) { |
190 | next if $class->has_attribute($name); |
191 | my $spec = $self->get_attribute($name); |
192 | Mouse::Meta::Attribute->create($class, $name, %$spec); |
193 | } |
194 | } |
195 | } else { |
196 | # apply role to role |
197 | # XXX Room for speed improvement |
198 | for my $role_spec (@roles) { |
199 | my $self = $role_spec->[0]->meta; |
200 | for my $name ($self->get_attribute_list) { |
201 | next if $class->has_attribute($name); |
202 | my $spec = $self->get_attribute($name); |
203 | $class->add_attribute($name, $spec); |
204 | } |
205 | } |
206 | } |
207 | |
208 | # XXX Room for speed improvement in role to role |
209 | for my $modifier_type (qw/before after around/) { |
210 | my $add_method = "add_${modifier_type}_method_modifier"; |
211 | for my $role_spec (@roles) { |
212 | my $self = $role_spec->[0]->meta; |
213 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
214 | |
215 | for my $method_name (keys %$modified) { |
216 | for my $code (@{ $modified->{$method_name} }) { |
217 | $class->$add_method($method_name => $code); |
218 | } |
219 | } |
220 | } |
221 | } |
222 | |
223 | # append roles |
224 | my %role_apply_cache; |
225 | my @apply_roles; |
226 | for my $role_spec (@roles) { |
227 | my $self = $role_spec->[0]->meta; |
228 | push @apply_roles, $self unless $role_apply_cache{$self}++; |
229 | for my $role ($self->roles) { |
230 | push @apply_roles, $role unless $role_apply_cache{$role}++; |
231 | } |
232 | } |
233 | } |
234 | |
c2f128e7 |
235 | for my $modifier_type (qw/before after around/) { |
236 | no strict 'refs'; |
fc0e0bbd |
237 | *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub { |
238 | my ($self, $method_name, $method) = @_; |
239 | |
240 | push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} }, |
241 | $method; |
242 | }; |
243 | |
c2f128e7 |
244 | *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub { |
245 | my ($self, $method_name, $method) = @_; |
246 | @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] } |
247 | }; |
248 | } |
249 | |
47f36c05 |
250 | sub roles { $_[0]->{roles} } |
251 | |
a2227e71 |
252 | 1; |
253 | |