2 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 = $self->name;
63 # Get all the CODE symbol table entries
64 my @functions = grep !/^meta$/,
65 grep { /\A[^\W\d]\w*\z/o }
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 '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' || $name eq 'excludes';
91 if ($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);
111 Mouse::Meta::Attribute->create($class, $name, %$spec);
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);
123 # XXX Room for speed improvement in role to role
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"};
128 for my $method_name (keys %$modified) {
129 for my $code (@{ $modified->{$method_name} }) {
130 $class->$add_method($method_name => $code);
136 push @{ $class->roles }, $self, @{ $self->roles };
140 my(undef, $class, @roles) = @_;
141 my $classname = $class->name;
143 if ($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);
152 confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'"
153 unless $method_required;
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' || $name eq 'excludes';
168 if ($classname->can($name)) {
169 # XXX what's Moose's behavior?
172 *{"${classname}::${name}"} = *{"${selfname}::${name}"};
174 if ($args{alias} && $args{alias}->{$name}) {
175 my $dstname = $args{alias}->{$name};
176 unless ($classname->can($dstname)) {
177 *{"${classname}::${dstname}"} = *{"${selfname}::${name}"};
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);
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);
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"};
215 for my $method_name (keys %$modified) {
216 for my $code (@{ $modified->{$method_name} }) {
217 $class->$add_method($method_name => $code);
224 my %role_apply_cache;
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}++;
235 for my $modifier_type (qw/before after around/) {
237 *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub {
238 my ($self, $method_name, $method) = @_;
240 push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} },
244 *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub {
245 my ($self, $method_name, $method) = @_;
246 @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] }
250 sub roles { $_[0]->{roles} }