1 package Moose::Meta::Role::Application::RoleSummation;
7 use Scalar::Util 'blessed';
9 use Moose::Meta::Role::Composite;
11 use base 'Moose::Meta::Role::Application';
13 __PACKAGE__->meta->add_attribute('role_params' => (
14 reader => 'role_params',
15 default => sub { {} },
16 Class::MOP::_definition_context(),
19 sub get_exclusions_for_role {
20 my ($self, $role) = @_;
21 $role = $role->name if blessed $role;
22 my $excludes_key = exists $self->role_params->{$role}->{'-excludes'} ?
23 '-excludes' : 'excludes';
24 if ($self->role_params->{$role} && defined $self->role_params->{$role}->{$excludes_key}) {
25 if (ref $self->role_params->{$role}->{$excludes_key} eq 'ARRAY') {
26 return $self->role_params->{$role}->{$excludes_key};
28 return [ $self->role_params->{$role}->{$excludes_key} ];
33 sub get_method_aliases_for_role {
34 my ($self, $role) = @_;
35 $role = $role->name if blessed $role;
36 my $alias_key = exists $self->role_params->{$role}->{'-alias'} ?
38 if ($self->role_params->{$role} && defined $self->role_params->{$role}->{$alias_key}) {
39 return $self->role_params->{$role}->{$alias_key};
44 sub is_method_excluded {
45 my ($self, $role, $method_name) = @_;
46 foreach ($self->get_exclusions_for_role($role->name)) {
47 return 1 if $_ eq $method_name;
52 sub is_method_aliased {
53 my ($self, $role, $method_name) = @_;
54 exists $self->get_method_aliases_for_role($role->name)->{$method_name} ? 1 : 0
57 sub is_aliased_method {
58 my ($self, $role, $method_name) = @_;
59 my %aliased_names = reverse %{$self->get_method_aliases_for_role($role->name)};
60 exists $aliased_names{$method_name} ? 1 : 0;
63 sub check_role_exclusions {
67 for my $role (@{ $c->get_roles }) {
68 my $name = $role->name;
70 for my $excluded ($role->get_excluded_roles_list) {
71 push @{ $excluded_roles{$excluded} }, $name;
75 foreach my $role (@{$c->get_roles}) {
76 foreach my $excluded (keys %excluded_roles) {
77 next unless $role->does_role($excluded);
79 my @excluding = @{ $excluded_roles{$excluded} };
81 Moose::Util::throw(sprintf "Conflict detected: Role%s %s exclude%s role '%s'", (@excluding == 1 ? '' : 's'), join(', ', @excluding), (@excluding == 1 ? 's' : ''), $excluded);
85 $c->add_excluded_roles(keys %excluded_roles);
88 sub check_required_methods {
91 my %all_required_methods =
92 map { $_->name => $_ }
93 map { $_->get_required_method_list }
96 foreach my $role (@{$c->get_roles}) {
97 foreach my $required (keys %all_required_methods) {
99 delete $all_required_methods{$required}
100 if $role->has_method($required)
101 || $self->is_aliased_method($role, $required);
105 $c->add_required_methods(values %all_required_methods);
108 sub check_required_attributes {
112 sub apply_attributes {
117 for my $role ( @{ $c->get_roles } ) {
118 push @all_attributes,
119 map { $role->get_attribute($_) } $role->get_attribute_list;
123 foreach my $attr (@all_attributes) {
124 my $name = $attr->name;
126 if ( exists $seen{$name} ) {
127 next if $seen{$name}->is_same_as($attr);
129 my $role1 = $seen{$name}->associated_role->name;
130 my $role2 = $attr->associated_role->name;
133 "We have encountered an attribute conflict with '$name' "
134 . "during role composition. "
135 . " This attribute is defined in both $role1 and $role2."
136 . " This is a fatal error and cannot be disambiguated." );
139 $seen{$name} = $attr;
142 foreach my $attr (@all_attributes) {
143 $c->add_attribute( $attr->clone );
150 my @all_methods = map {
152 my $aliases = $self->get_method_aliases_for_role($role);
153 my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) };
156 exists $excludes{$_} ? () :
160 method => $role->get_method($_),
163 grep { !$_->isa('Class::MOP::Method::Meta') }
164 $role->_get_local_methods),
168 name => $aliases->{$_},
169 method => $role->get_method($_),
175 my (%seen, %conflicts, %method_map);
176 foreach my $method (@all_methods) {
177 next if $conflicts{$method->{name}};
178 my $seen = $seen{$method->{name}};
181 if ($seen->{method}->body != $method->{method}->body) {
182 $c->add_conflicting_method(
183 name => $method->{name},
184 roles => [$method->{role}->name, $seen->{role}->name],
187 delete $method_map{$method->{name}};
188 $conflicts{$method->{name}} = 1;
193 $seen{$method->{name}} = $method;
194 $method_map{$method->{name}} = $method->{method};
197 $c->add_method($_ => $method_map{$_}) for keys %method_map;
200 sub apply_override_method_modifiers {
203 my @all_overrides = map {
208 method => $role->get_override_method_modifier($_),
210 } $role->get_method_modifier_list('override');
214 foreach my $override (@all_overrides) {
215 if ( $c->has_method($override->{name}) ){
216 Moose::Util::throw( "Role '" . $c->name . "' has encountered an 'override' method conflict " .
217 "during composition (A local method of the same name as been found). This " .
220 if (exists $seen{$override->{name}}) {
221 if ( $seen{$override->{name}} != $override->{method} ) {
222 Moose::Util::throw( "We have encountered an 'override' method conflict during " .
223 "composition (Two 'override' methods of the same name encountered). " .
224 "This is fatal error.")
227 $seen{$override->{name}} = $override->{method};
230 $c->add_override_method_modifier(
231 $_->{name}, $_->{method}
232 ) for @all_overrides;
236 sub apply_method_modifiers {
237 my ($self, $modifier_type, $c) = @_;
238 my $add = "add_${modifier_type}_method_modifier";
239 my $get = "get_${modifier_type}_method_modifiers";
240 foreach my $role (@{$c->get_roles}) {
241 foreach my $method_name ($role->get_method_modifier_list($modifier_type)) {
245 ) foreach $role->$get($method_name);
252 # ABSTRACT: Combine two or more roles
260 Summation composes two traits, forming the union of non-conflicting
261 bindings and 'disabling' the conflicting bindings
273 =item B<get_exclusions_for_role>
275 =item B<get_method_aliases_for_role>
277 =item B<is_aliased_method>
279 =item B<is_method_aliased>
281 =item B<is_method_excluded>
285 =item B<check_role_exclusions>
287 =item B<check_required_methods>
289 =item B<check_required_attributes>
291 =item B<apply_attributes>
293 =item B<apply_methods>
295 =item B<apply_method_modifiers>
297 =item B<apply_override_method_modifiers>
303 See L<Moose/BUGS> for details on reporting bugs.