use Carp 'confess';
use Scalar::Util 'weaken', 'blessed', 'reftype';
-our $VERSION = '0.05';
+our $VERSION = '0.06';
use base 'Class::MOP::Class';
my ($self, $role_name) = @_;
(defined $role_name)
|| confess "You must supply a role name to look for";
- foreach my $role (@{$self->roles}) {
- return 1 if $role->does_role($role_name);
+ foreach my $class ($self->class_precedence_list) {
+ foreach my $role (@{$class->meta->roles}) {
+ return 1 if $role->does_role($role_name);
+ }
+ }
+ return 0;
+}
+
+sub excludes_role {
+ my ($self, $role_name) = @_;
+ (defined $role_name)
+ || confess "You must supply a role name to look for";
+ foreach my $class ($self->class_precedence_list) {
+ foreach my $role (@{$class->meta->roles}) {
+ return 1 if $role->excludes_role($role_name);
+ }
}
return 0;
}
sub construct_instance {
my ($class, %params) = @_;
my $meta_instance = $class->get_meta_instance;
+ # FIXME:
+ # the code below is almost certainly incorrect
+ # but this is foreign inheritence, so we might
+ # have to kludge it in the end.
my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
foreach my $attr ($class->compute_all_applicable_attributes()) {
$attr->initialize_instance_slot($meta_instance, $instance, \%params)
return $self->SUPER::has_method($method_name);
}
-sub add_attribute {
- my ($self, $name, %params) = @_;
-
- my @delegations;
- if ( my $delegation = delete $params{handles} ) {
- my @method_names_or_hashes = $self->compute_delegation( $name, $delegation, \%params );
- @delegations = $self->get_delegatable_methods( @method_names_or_hashes );
- }
-
- my $ret = $self->SUPER::add_attribute( $name, %params );
-
- if ( @delegations ) {
- my $attr = $self->get_attribute( $name );
- $self->generate_delgate_method( $attr, $_ ) for @delegations;
- }
-
- return $ret;
-}
-
-sub generate_delgate_method {
- my ( $self, $attr, $method ) = @_;
-
- # FIXME like generated accessors these methods must be regenerated
- # FIXME the reader may not work for subclasses with weird instances
-
- my $reader = $attr->generate_reader_method( $attr->name ); # FIXME no need for attr name
-
- my $method_name = $method->{name};
- my $new_name = $method->{new_name} || $method_name;
-
- $self->add_method( $new_name, sub {
- if ( Scalar::Util::blessed( my $delegate = shift->$reader ) ) {
- return $delegate->$method_name( @_ );
- }
- return;
- });
-}
-
-sub compute_delegation {
- my ( $self, $attr_name, $delegation, $params ) = @_;
-
-
- # either it's a concrete list of method names
- return $delegation unless ref $delegation; # single method name
- return @$delegation if reftype($delegation) eq "ARRAY";
-
- # or it's a generative api
- my $delegator_meta = $self->_guess_attr_class_or_role( $attr_name, $params );
- $self->generate_delegation_list( $delegation, $delegator_meta );
-}
-
-sub get_delegatable_methods {
- my ( $self, @names_or_hashes ) = @_;
- my @hashes = map { ref($_) ? $_ : { name => $_ } } @names_or_hashes;
- return grep { !$self->name->can( $_->{name} ) } @hashes;
-}
-
-sub generate_delegation_list {
- my ( $self, $delegation, $delegator_meta ) = @_;
-
- if ( reftype($delegation) eq "CODE" ) {
- return $delegation->( $self, $delegator_meta );
- } elsif ( blessed($delegation) eq "Regexp" ) {
- confess "For regular expression support the delegator class/role must use a Class::MOP::Class metaclass"
- unless $delegator_meta->isa( "Class::MOP::Class" );
- return grep { $_->{name} =~ /$delegation/ } $delegator_meta->compute_all_applicable_methods();
- } else {
- confess "The 'handles' specification '$delegation' is not supported";
- }
-}
-
-sub _guess_attr_class_or_role {
- my ( $self, $attr, $params ) = @_;
-
- my ( $isa, $does ) = @{ $params }{qw/isa does/};
-
- confess "Generative delegations must explicitly specify a class or a role for the attribute's type"
- unless $isa || $does;
-
- for (grep { blessed($_) } $isa, $does) {
- confess "You must use classes/roles, not type constraints to use delegation"
- unless $_->isa( "Moose::Meta::Class" );
- }
-
- confess "Cannot have an isa option and a does option if the isa does not do the does"
- if $isa and $does and $isa->can("does") and !$isa->does( $does );
-
- # if it's a class/role name make it into a meta object
- for ($isa, $does) {
- $_ = $_->meta if defined and !ref and $_->can("meta");
- }
-
- return $isa || $does;
-}
-
sub add_override_method_modifier {
my ($self, $name, $method, $_super_package) = @_;
+ (!$self->has_method($name))
+ || confess "Cannot add an override method if a local method is already present";
# need this for roles ...
$_super_package ||= $self->name;
my $super = $self->find_next_method_by_name($name);
sub add_augment_method_modifier {
my ($self, $name, $method) = @_;
+ (!$self->has_method($name))
+ || confess "Cannot add an augment method if a local method is already present";
my $super = $self->find_next_method_by_name($name);
(defined $super)
|| confess "You cannot augment '$name' because it has no super method";
not only check it's local roles, but ask them as well in order to
cascade down the role hierarchy.
+=item B<excludes_role ($role_name)>
+
+This will test if this class C<excludes> a given C<$role_name>. It will
+not only check it's local roles, but ask them as well in order to
+cascade down the role hierarchy.
+
+=item B<add_attribute $attr_name, %params>
+
+This method does the same thing as L<Class::MOP::Class/add_attribute>, but adds
+suport for delegation.
+
+=back
+
+=head1 INTERNAL METHODS
+
+=over 4
+
+=item compute_delegation
+
+=item generate_delegation_list
+
+=item generate_delgate_method
+
+=item get_delegatable_methods
+
+=item filter_delegations
+
=back
=head1 BUGS
it under the same terms as Perl itself.
=cut
+
projects / gitmo/Moose.git / blobdiff