}
sub new {
- my ( $class, $meta ) = @_;
+ my ($class, $meta, @attrs) = @_;
+ my @slots = map { $_->slots } @attrs;
bless {
- meta => $meta,
- instance_layout => {}
+ # NOTE:
+ # I am not sure that it makes
+ # sense to pass in the meta
+ # The ideal would be to just
+ # pass in the class name, but
+ # that is placing too much of
+ # an assumption on bless(),
+ # which is *probably* a safe
+ # assumption,.. but you can
+ # never tell <:)
+ meta => $meta,
+ slots => \@slots,
} => $class;
}
sub create_instance {
- my ( $self, $class ) = @_;
-
- # rely on autovivification
- $self->bless_instance_structure( {}, $class );
+ my $self = shift;
+ $self->bless_instance_structure({});
}
sub bless_instance_structure {
- my ( $self, $instance_structure, $class ) = @_;
- $class ||= $self->{meta}->name;
- bless $instance_structure, $class;
-}
-
-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 { $_->meta || () } @parents;
+ my ($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 );
- $self->{instance_layout}->{$slot_name} = undef;
-}
-
-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;
-}
-
-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 );
- delete $self->{instance_layout}->{$slot_name};
+sub get_all_slots {
+ my $self = shift;
+ return @{$self->{slots}};
}
-
# 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) = @_;
- $slot_name or confess "must provide slot name";
$instance->{$slot_name} = $value;
}
-# 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 . " = $value",
-}
-
-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) . ' = ' . $value_name);
}
sub inline_initialize_slot {
- return "";
-}
-
-sub inline_slot_initialized {
- my ($self, $instance, $slot_name) = @_;
- "exists " . $self->inline_get_slot_value;
+ my ($self, $instance_var_name, $slot_name) = @_;
+ $self->inline_set_slot_value($instance_var_name, $slot_name, 'undef');
}
-sub _inline_slot_lvalue {
- my ($self, $instance, $slot_name) = @_;
- $self->inline_slot_value;
+sub inline_is_slot_initialized {
+ my ($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<inline_initialize_slot>
-=item B<slot_initialized>
+=item B<inline_is_slot_initialized>
=back
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
-=cut
\ No newline at end of file
+=cut