1 package Moose::Meta::Role::Application::ToClass;
7 use Moose::Util 'english_list';
8 use Scalar::Util 'weaken', 'blessed';
10 use base 'Moose::Meta::Role::Application';
12 __PACKAGE__->meta->add_attribute('role' => (
16 __PACKAGE__->meta->add_attribute('class' => (
21 my ($self, $role, $class) = @_;
23 # We need weak_ref in CMOP :(
24 weaken($self->{role} = $role);
25 weaken($self->{class} = $class);
27 $self->SUPER::apply($role, $class);
29 $class->add_role($role);
30 $class->add_role_application($self);
33 sub check_role_exclusions {
34 my ($self, $role, $class) = @_;
35 if ($class->excludes_role($role->name)) {
36 $class->throw_error("Conflict detected: " . $class->name . " excludes role '" . $role->name . "'");
38 foreach my $excluded_role_name ($role->get_excluded_roles_list) {
39 if ($class->does_role($excluded_role_name)) {
40 $class->throw_error("The class " . $class->name . " does the excluded role '$excluded_role_name'");
45 sub check_required_methods {
46 my ($self, $role, $class) = @_;
52 # we might need to move this down below the
53 # the attributes so that we can require any
54 # attribute accessors. However I am thinking
55 # that maybe those are somehow exempt from
56 # the require methods stuff.
57 foreach my $required_method ($role->get_required_method_list) {
58 my $required_method_name = $required_method->name;
60 if (!$class->find_method_by_name($required_method_name)) {
62 next if $self->is_aliased_method($required_method_name);
64 push @missing, $required_method;
68 return unless @missing;
72 @missing = sort { $a->name cmp $b->name } @missing;
73 my @conflicts = grep { $_->isa('Moose::Meta::Role::Method::Conflicting') } @missing;
76 my $conflict = $conflicts[0];
77 my $roles = $conflict->roles_as_english_list;
79 my @same_role_conflicts = grep { $_->roles_as_english_list eq $roles } @conflicts;
81 if (@same_role_conflicts == 1) {
83 .= "Due to a method name conflict in roles "
87 . "' must be implemented or excluded by '"
93 = Moose::Util::english_list( map { q{'} . $_->name . q{'} } @same_role_conflicts );
96 .= "Due to method name conflicts in roles "
100 . " must be implemented or excluded by '"
106 my $noun = @missing == 1 ? 'method' : 'methods';
109 = Moose::Util::english_list( map { q{'} . $_ . q{'} } @missing );
114 . "' requires the $noun $list "
115 . "to be implemented by '"
116 . $class->name . q{'};
119 $class->throw_error($error);
122 sub check_required_attributes {
126 sub apply_attributes {
127 my ($self, $role, $class) = @_;
128 my $attr_metaclass = $role->applied_attribute_metaclass;
130 foreach my $attribute_name ($role->get_attribute_list) {
131 # it if it has one already
132 if ($class->has_attribute($attribute_name) &&
133 # make sure we haven't seen this one already too
134 $class->get_attribute($attribute_name) != $role->get_attribute($attribute_name)) {
138 $class->add_attribute(
139 $role->get_attribute($attribute_name)->attribute_for_class($attr_metaclass)
146 my ( $self, $role, $class ) = @_;
148 foreach my $method ( $role->_get_local_methods ) {
149 my $method_name = $method->name;
151 next if $method->isa('Class::MOP::Method::Meta');
153 unless ( $self->is_method_excluded($method_name) ) {
155 my $class_method = $class->get_method($method_name);
157 next if $class_method && $class_method->body != $method->body;
165 next unless $self->is_method_aliased($method_name);
167 my $aliased_method_name = $self->get_method_aliases->{$method_name};
169 my $class_method = $class->get_method($aliased_method_name);
171 if ( $class_method && $class_method->body != $method->body ) {
173 "Cannot create a method alias if a local method of the same name exists"
178 $aliased_method_name,
183 # we must reset the cache here since
184 # we are just aliasing methods, otherwise
185 # the modifiers go wonky.
186 $class->reset_package_cache_flag;
189 sub apply_override_method_modifiers {
190 my ($self, $role, $class) = @_;
191 foreach my $method_name ($role->get_method_modifier_list('override')) {
192 # it if it has one already then ...
193 if ($class->has_method($method_name)) {
197 # if this is not a role, then we need to
198 # find the original package of the method
199 # so that we can tell the class were to
200 # find the right super() method
201 my $method = $role->get_override_method_modifier($method_name);
202 my ($package) = Class::MOP::get_code_info($method);
203 # if it is a class, we just add it
204 $class->add_override_method_modifier($method_name, $method, $package);
209 sub apply_method_modifiers {
210 my ($self, $modifier_type, $role, $class) = @_;
211 my $add = "add_${modifier_type}_method_modifier";
212 my $get = "get_${modifier_type}_method_modifiers";
213 foreach my $method_name ($role->get_method_modifier_list($modifier_type)) {
217 ) foreach $role->$get($method_name);
223 # ABSTRACT: Compose a role into a class
241 =item B<check_role_exclusions>
243 =item B<check_required_methods>
245 =item B<check_required_attributes>
247 =item B<apply_attributes>
249 =item B<apply_methods>
251 =item B<apply_method_modifiers>
253 =item B<apply_override_method_modifiers>
259 See L<Moose/BUGS> for details on reporting bugs.