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' => (
22 "Moose::Util::does_role( $val, " . B::perlstring( $self->role ) . ')';
26 my ( $class, %args ) = @_;
28 $args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Object');
30 my $role_name = $args{role};
31 $args{constraint} = sub { Moose::Util::does_role( $_[0], $role_name ) };
33 $args{inlined} = $inliner;
35 my $self = $class->_new( \%args );
37 $self->_create_hand_optimized_type_constraint;
38 $self->compile_type_constraint();
43 sub _create_hand_optimized_type_constraint {
45 my $role = $self->role;
46 $self->hand_optimized_type_constraint(
47 sub { Moose::Util::does_role($_[0], $role) }
56 # FIXME find_type_constraint might find a TC named after the role but that isn't really it
57 # I did this anyway since it's a convention that preceded TypeConstraint::Role, and it should DWIM
58 # if anybody thinks this problematic please discuss on IRC.
59 # a possible fix is to add by attr indexing to the type registry to find types of a certain property
60 # regardless of their name
61 Moose::Util::TypeConstraints::find_type_constraint($_)
63 __PACKAGE__->new( role => $_, name => "__ANON__" )
64 } @{ Class::MOP::class_of($self->role)->get_roles },
69 my ( $self, $type_or_name ) = @_;
71 my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
73 return unless defined $other;
74 return unless $other->isa(__PACKAGE__);
76 return $self->role eq $other->role;
80 my ($self, $type_or_name) = @_;
82 my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
84 ($self->equals($type) || $self->is_subtype_of($type_or_name));
88 my ($self, $type_or_name_or_role ) = @_;
90 if ( not ref $type_or_name_or_role ) {
92 return 1 if Class::MOP::class_of($self->role)->does_role( $type_or_name_or_role );
95 my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_role);
97 return unless defined $type;
99 if ( $type->isa(__PACKAGE__) ) {
100 # if $type_or_name_or_role isn't a role, it might be the TC name of another ::Role type
101 # or it could also just be a type object in this branch
102 return Class::MOP::class_of($self->role)->does_role( $type->role );
104 # the only other thing we are a subtype of is Object
105 $self->SUPER::is_subtype_of($type);
109 sub create_child_type {
110 my ($self, @args) = @_;
111 return Moose::Meta::TypeConstraint->new(@args, parent => $self);
116 # ABSTRACT: Role/TypeConstraint parallel hierarchy
124 This class represents type constraints for a role.
128 C<Moose::Meta::TypeConstraint::Role> is a subclass of
129 L<Moose::Meta::TypeConstraint>.
135 =item B<< Moose::Meta::TypeConstraint::Role->new(%options) >>
137 This creates a new role type constraint based on the given
140 It takes the same options as its parent, with two exceptions. First,
141 it requires an additional option, C<role>, which is name of the
142 constraint's role. Second, it automatically sets the parent to the
145 The constructor also overrides the hand optimized type constraint with
146 one it creates internally.
148 =item B<< $constraint->role >>
150 Returns the role name associated with the constraint.
152 =item B<< $constraint->parents >>
154 Returns all the type's parent types, corresponding to the roles that
157 =item B<< $constraint->is_subtype_of($type_name_or_object) >>
159 If the given type is also a role type, then this checks that the
160 type's role does the other type's role.
162 Otherwise it falls back to the implementation in
163 L<Moose::Meta::TypeConstraint>.
165 =item B<< $constraint->create_child_type(%options) >>
167 This returns a new L<Moose::Meta::TypeConstraint> object with the type
170 Note that it does I<not> return a C<Moose::Meta::TypeConstraint::Role>
177 See L<Moose/BUGS> for details on reporting bugs.