1 package Mouse::Meta::Role;
10 # because Mouse doesn't introspect existing classes, we're forced to
11 # only pay attention to other Mouse classes
12 sub _metaclass_cache {
15 return $METACLASS_CACHE{$name};
21 $METACLASS_CACHE{$name} = $class->new(name => $name)
22 if !exists($METACLASS_CACHE{$name});
23 return $METACLASS_CACHE{$name};
31 $args{attributes} ||= {};
32 $args{required_methods} ||= [];
38 sub name { $_[0]->{name} }
40 sub add_required_methods {
43 push @{$self->{required_methods}}, @methods;
50 $self->{attributes}->{$name} = $spec;
53 sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
54 sub get_attribute_list { keys %{ $_[0]->{attributes} } }
55 sub get_attribute { $_[0]->{attributes}->{$_[1]} }
57 # copied from Class::Inspector
60 my $name = $self->name;
63 # Get all the CODE symbol table entries
65 grep !/^(?:has|with|around|before|after|blessed|extends|confess|excludes|meta|requires)$/,
66 grep { defined &{"${name}::$_"} }
68 wantarray ? @functions : \@functions;
73 my $selfname = $self->name;
75 my $classname = $class->name;
78 if ($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'";
88 for my $name ($self->get_method_list) {
89 next if $name eq 'meta';
91 if ($classname->can($name)) {
92 # XXX what's Moose's behavior?
95 *{"${classname}::${name}"} = *{"${selfname}::${name}"};
97 if ($args{alias} && $args{alias}->{$name}) {
98 my $dstname = $args{alias}->{$name};
99 unless ($classname->can($dstname)) {
100 *{"${classname}::${dstname}"} = *{"${selfname}::${name}"};
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);
112 my $metaclass = 'Mouse::Meta::Attribute';
113 if ( my $metaclass_name = $spec->{metaclass} ) {
114 my $new_class = Mouse::Util::resolve_metaclass_alias(
118 if ( $metaclass ne $new_class ) {
119 $metaclass = $new_class;
123 $metaclass->create($class, $name, %$spec);
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);
135 # XXX Room for speed improvement in role to role
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"};
140 for my $method_name (keys %$modified) {
141 for my $code (@{ $modified->{$method_name} }) {
142 $class->$add_method($method_name => $code);
148 push @{ $class->roles }, $self, @{ $self->roles };
152 my(undef, $class, @roles) = @_;
153 my $classname = $class->name;
155 if ($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);
164 confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'"
165 unless $method_required;
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) {
178 next if $name eq 'meta';
180 if ($classname->can($name)) {
181 # XXX what's Moose's behavior?
184 *{"${classname}::${name}"} = *{"${selfname}::${name}"};
186 if ($args{alias} && $args{alias}->{$name}) {
187 my $dstname = $args{alias}->{$name};
188 unless ($classname->can($dstname)) {
189 *{"${classname}::${dstname}"} = *{"${selfname}::${name}"};
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);
205 my $metaclass = 'Mouse::Meta::Attribute';
206 if ( my $metaclass_name = $spec->{metaclass} ) {
207 my $new_class = Mouse::Util::resolve_metaclass_alias(
211 if ( $metaclass ne $new_class ) {
212 $metaclass = $new_class;
216 $metaclass->create($class, $name, %$spec);
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);
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"};
239 for my $method_name (keys %$modified) {
240 for my $code (@{ $modified->{$method_name} }) {
241 $class->$add_method($method_name => $code);
248 my %role_apply_cache;
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}++;
259 for my $modifier_type (qw/before after around/) {
261 *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub {
262 my ($self, $method_name, $method) = @_;
264 push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} },
268 *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub {
269 my ($self, $method_name, $method) = @_;
270 @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] }
274 sub roles { $_[0]->{roles} }