}
sub new {
- my ( $class, $meta ) = @_;
+ my ($class, $meta) = @_;
+ my $slots = $class->_compute_slot_list_from_class($meta);
bless {
- meta => $meta,
- instance_layout => {}
+ meta => $meta,
+ slots => $slots,
} => $class;
}
-sub create_instance {
- my ( $self, $class ) = @_;
-
- # rely on autovivification
- $self->bless_instance_structure( {}, $class );
+# private for now ...
+sub _compute_slot_list_from_class {
+ my ($self, $meta) = @_;
+ return [
+ map {
+ $_->name
+ } $meta->compute_all_applicable_attributes()
+ ];
}
-sub bless_instance_structure {
- my ( $self, $instance_structure, $class ) = @_;
- $class ||= $self->{meta}->name;
- bless $instance_structure, $class;
+sub create_instance {
+ my $self = shift;
+ $self->bless_instance_structure({});
}
-sub get_all_parents {
- my $self = shift;
- my @parents = $self->{meta}->class_precedence_list;
- shift @parents; # shift off ourselves
- return map { $_->get_meta_instance } map { $_->meta || () } @parents;
+sub bless_instance_structure {
+ my ($self, $instance_structure) = @_;
+ bless $instance_structure, $self->{meta}->name;
}
# operations on meta instance
-sub add_slot {
- my ($self, $slot_name ) = @_;
- confess "The slot '$slot_name' already exists"
- if 0 && $self->has_slot_recursively( $slot_name ); # FIXME
- $self->{instance_layout}->{$slot_name} = undef;
-}
-
sub get_all_slots {
my $self = shift;
- keys %{ $self->{instance_layout} };
-}
-
-sub get_all_slots_recursively {
- my $self = shift;
- return (
- $self->get_all_slots,
- map { $_->get_all_slots } $self->get_all_parents,
- ),
-}
-
-sub has_slot {
- my ($self, $slot_name) = @_;
- exists $self->{instance_layout}->{$slot_name} ? 1 : 0;
-}
-
-sub has_slot_recursively {
- my ( $self, $slot_name ) = @_;
- return 1 if $self->has_slot($slot_name);
- $_->has_slot_recursively($slot_name) && return 1 for $self->get_all_parents;
- return 0;
+ return @{$self->{slots}};
}
-sub remove_slot {
- my ( $self, $slot_name ) = @_;
- # NOTE:
- # this does not search recursively cause
- # that is not the domain of this meta-instance
- # it is specific to this class ...
- confess "The slot '$slot_name' does not exist (maybe it's inherited?)"
- if 0 && $self->has_slot( $slot_name ); # FIXME
- delete $self->{instance_layout}->{$slot_name};
-}
-
-
# operations on created instances
sub get_slot_value {
return $instance->{$slot_name};
}
-# can be called only after initialize_slot_value
sub set_slot_value {
my ($self, $instance, $slot_name, $value) = @_;
$instance->{$slot_name} = $value;
}
-sub set_weak_slot_value {
- my ( $self, $instance, $slot_name, $value) = @_;
- $self->set_slot_value( $instance, $slot_name, $value );
- $self->weeaken_slot_value( $instance, $slot_name );
-}
-
-sub weaken_slot_value {
- my ( $self, $instance, $slot_name ) = @_;
- weaken( $instance->{$slot_name} );
-}
-
-# convenience method
-# non autovivifying stores will have this as { initialize_slot unless slot_initlized; set_slot_value }
-sub set_slot_value_with_init {
- my ( $self, $instance, $slot_name, $value ) = @_;
- $self->set_slot_value( $instance, $slot_name, $value );
-}
-
sub initialize_slot {
- my ( $self, $instance, $slot_name ) = @_;
+ my ($self, $instance, $slot_name) = @_;
+ $instance->{$slot_name} = undef;
}
-sub slot_initialized {
- my ($self, $instance, $slot_name) = @_;
+sub is_slot_initialized {
+ my ($self, $instance, $slot_name, $value) = @_;
exists $instance->{$slot_name} ? 1 : 0;
}
-
# inlinable operation snippets
sub inline_get_slot_value {
- my ($self, $instance, $slot_name) = @_;
- sprintf "%s->{%s}", $instance, $slot_name;
+ my ($self, $instance_var_name, $slot_name) = @_;
+ return ($instance_var_name . '->{\'' . $slot_name . '\'}');
}
sub inline_set_slot_value {
- my ($self, $instance, $slot_name, $value) = @_;
- $self->_inline_slot_lvalue( $instance, $slot_name ) . " = $value",
-}
-
-sub inline_set_weak_slot_value {
- my ( $self, $instance, $slot_name, $value ) = @_;
- return ""
- . $self->inline_set_slot_value( $instance, $slot_name, $value )
- . "; "
- . $self->inline_weaken_slot_value( $instance, $slot_name );
-}
-
-sub inline_weaken_slot_value {
- my ( $self, $instance, $slot_name ) = @_;
- return 'Scalar::Util::weaken( ' . $self->_inline_slot_lvalue( $instance, $slot_name ) . ')';
-}
-
-sub inline_set_slot_value_with_init {
- my ( $self, $instance, $slot_name, $value) = @_;
- $self->inline_set_slot_value( $instance, $slot_name, $value ) . ";";
+ my ($self, $instance_var_name, $slot_name, $value_name) = @_;
+ return ($self->inline_get_slot_value($instance_var_name, $slot_name) . ' = ' . $value_name);
}
sub inline_initialize_slot {
- return "";
+ my ($self, $instance_var_name, $slot_name) = @_;
+ $self->inline_set_slot_value($instance_var_name, $slot_name, 'undef');
}
-sub inline_slot_initialized {
- my ($self, $instance, $slot_name) = @_;
- "exists " . $self->inline_get_slot_value;
-}
-
-sub _inline_slot_lvalue {
- my ($self, $instance, $slot_name) = @_;
- $self->inline_get_slot_value( $instance, $slot_name );
+sub inline_is_slot_initialized {
+ my ($self, $instance_var_name, $slot_name) = @_;
+ return ('exists ' . $self->inline_get_slot_value($instance_var_name, $slot_name) . ' ? 1 : 0');
}
1;
=item B<new>
-=item B<add_slot>
-
=item B<bless_instance_structure>
+=item B<compute_layout_from_class>
+
=item B<create_instance>
-=item B<get_all_parents>
+=item B<get_all_slots>
=item B<get_slot_value>
-=item B<has_slot>
-
-=item B<has_slot_recursively>
+=item B<set_slot_value>
=item B<initialize_slot>
-=item B<inline_get_slot_value>
+=item B<is_slot_initialized>
-=item B<inline_initialize_slot>
+=item B<inline_get_slot_value>
=item B<inline_set_slot_value>
-=item B<inline_set_slot_value_with_init>
-
-=item B<inline_slot_initialized>
-
-=item B<remove_slot>
-
-=item B<set_slot_value>
-
-=item B<set_slot_value_with_init>
-
-=item B<slot_initialized>
-
-=item B<get_all_slots>
+=item B<inline_initialize_slot>
-=item B<get_all_slots_recursively>
+=item B<inline_is_slot_initialized>
=back
projects / gitmo/Class-MOP.git / blobdiff