1 package Moose::Meta::TypeConstraint::Role;
8 use Scalar::Util 'blessed';
9 use Moose::Util::TypeConstraints ();
11 use base 'Moose::Meta::TypeConstraint';
13 __PACKAGE__->meta->add_attribute('role' => (
21 return 'Moose::Util::does_role('
23 . B::perlstring($self->role)
28 my ( $class, %args ) = @_;
30 $args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Object');
32 my $role_name = $args{role};
33 $args{constraint} = sub { Moose::Util::does_role( $_[0], $role_name ) };
35 $args{inlined} = $inliner;
37 my $self = $class->_new( \%args );
39 $self->_create_hand_optimized_type_constraint;
40 $self->compile_type_constraint();
45 sub _create_hand_optimized_type_constraint {
47 my $role = $self->role;
48 $self->hand_optimized_type_constraint(
49 sub { Moose::Util::does_role($_[0], $role) }
58 # FIXME find_type_constraint might find a TC named after the role but that isn't really it
59 # I did this anyway since it's a convention that preceded TypeConstraint::Role, and it should DWIM
60 # if anybody thinks this problematic please discuss on IRC.
61 # a possible fix is to add by attr indexing to the type registry to find types of a certain property
62 # regardless of their name
63 Moose::Util::TypeConstraints::find_type_constraint($_)
65 __PACKAGE__->new( role => $_, name => "__ANON__" )
66 } @{ Class::MOP::class_of($self->role)->get_roles },
71 my ( $self, $type_or_name ) = @_;
73 my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
75 return unless defined $other;
76 return unless $other->isa(__PACKAGE__);
78 return $self->role eq $other->role;
82 my ($self, $type_or_name) = @_;
84 my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
86 ($self->equals($type) || $self->is_subtype_of($type_or_name));
90 my ($self, $type_or_name_or_role ) = @_;
92 if ( not ref $type_or_name_or_role ) {
94 return 1 if Class::MOP::class_of($self->role)->does_role( $type_or_name_or_role );
97 my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_role);
99 return unless defined $type;
101 if ( $type->isa(__PACKAGE__) ) {
102 # if $type_or_name_or_role isn't a role, it might be the TC name of another ::Role type
103 # or it could also just be a type object in this branch
104 return Class::MOP::class_of($self->role)->does_role( $type->role );
106 # the only other thing we are a subtype of is Object
107 $self->SUPER::is_subtype_of($type);
111 sub create_child_type {
112 my ($self, @args) = @_;
113 return Moose::Meta::TypeConstraint->new(@args, parent => $self);
118 # ABSTRACT: Role/TypeConstraint parallel hierarchy
126 This class represents type constraints for a role.
130 C<Moose::Meta::TypeConstraint::Role> is a subclass of
131 L<Moose::Meta::TypeConstraint>.
137 =item B<< Moose::Meta::TypeConstraint::Role->new(%options) >>
139 This creates a new role type constraint based on the given
142 It takes the same options as its parent, with two exceptions. First,
143 it requires an additional option, C<role>, which is name of the
144 constraint's role. Second, it automatically sets the parent to the
147 The constructor also overrides the hand optimized type constraint with
148 one it creates internally.
150 =item B<< $constraint->role >>
152 Returns the role name associated with the constraint.
154 =item B<< $constraint->parents >>
156 Returns all the type's parent types, corresponding to the roles that
159 =item B<< $constraint->is_subtype_of($type_name_or_object) >>
161 If the given type is also a role type, then this checks that the
162 type's role does the other type's role.
164 Otherwise it falls back to the implementation in
165 L<Moose::Meta::TypeConstraint>.
167 =item B<< $constraint->create_child_type(%options) >>
169 This returns a new L<Moose::Meta::TypeConstraint> object with the type
172 Note that it does I<not> return a C<Moose::Meta::TypeConstraint::Role>
179 See L<Moose/BUGS> for details on reporting bugs.