use strict;
use warnings;
+use Class::MOP::Method::Accessor;
+
use Carp 'confess';
use Scalar::Util 'blessed', 'reftype', 'weaken';
-our $VERSION = '0.09';
+our $VERSION = '0.12';
+our $AUTHORITY = 'cpan:STEVAN';
+
+use base 'Class::MOP::Object';
sub meta {
require Class::MOP::Class;
(defined $name && $name)
|| confess "You must provide a name for the attribute";
+
$options{init_arg} = $name
if not exists $options{init_arg};
+ (is_default_a_coderef(\%options))
+ || confess("References are not allowed as default values, you must ".
+ "wrap then in a CODE reference (ex: sub { [] } and not [])")
+ if exists $options{default} && ref $options{default};
+
bless {
name => $name,
accessor => $options{accessor},
reader => $options{reader},
writer => $options{writer},
predicate => $options{predicate},
+ clearer => $options{clearer},
init_arg => $options{init_arg},
default => $options{default},
# keep a weakened link to the
# class we are associated with
associated_class => undef,
+ # and a list of the methods
+ # associated with this attr
+ associated_methods => [],
} => $class;
}
sub name { $_[0]->{name} }
-sub associated_class { $_[0]->{associated_class} }
+sub associated_class { $_[0]->{associated_class} }
+sub associated_methods { $_[0]->{associated_methods} }
sub has_accessor { defined($_[0]->{accessor}) ? 1 : 0 }
sub has_reader { defined($_[0]->{reader}) ? 1 : 0 }
sub has_writer { defined($_[0]->{writer}) ? 1 : 0 }
sub has_predicate { defined($_[0]->{predicate}) ? 1 : 0 }
+sub has_clearer { defined($_[0]->{clearer}) ? 1 : 0 }
sub has_init_arg { defined($_[0]->{init_arg}) ? 1 : 0 }
sub has_default { defined($_[0]->{default}) ? 1 : 0 }
sub reader { $_[0]->{reader} }
sub writer { $_[0]->{writer} }
sub predicate { $_[0]->{predicate} }
+sub clearer { $_[0]->{clearer} }
sub init_arg { $_[0]->{init_arg} }
# end bootstrapped away method section.
# (all methods below here are kept intact)
sub is_default_a_coderef {
- (reftype($_[0]->{default}) && reftype($_[0]->{default}) eq 'CODE')
+ ('CODE' eq (reftype($_[0]->{default}) || ''))
}
sub default {
$self->{associated_class} = undef;
}
+# method association
+
+sub associate_method {
+ my ($self, $method) = @_;
+ push @{$self->{associated_methods}} => $method;
+}
+
## Slot management
sub set_value {
- my ( $self, $instance, $value ) = @_;
+ my ($self, $instance, $value) = @_;
- Class::MOP::Class->initialize(Scalar::Util::blessed($instance))
+ Class::MOP::Class->initialize(blessed($instance))
->get_meta_instance
- ->set_slot_value( $instance, $self->name, $value );
+ ->set_slot_value($instance, $self->name, $value);
}
sub get_value {
- my ( $self, $instance ) = @_;
+ my ($self, $instance) = @_;
- Class::MOP::Class->initialize(Scalar::Util::blessed($instance))
+ Class::MOP::Class->initialize(blessed($instance))
->get_meta_instance
- ->get_slot_value( $instance, $self->name );
-}
-
-## Method generation helpers
-
-sub generate_accessor_method {
- my $attr = shift;
- return sub {
- $attr->set_value( $_[0], $_[1] ) if scalar(@_) == 2;
- $attr->get_value( $_[0] );
- };
-}
-
-sub generate_accessor_method_inline {
- my $self = shift;
- my $attr_name = $self->name;
- my $meta_instance = $self->associated_class->instance_metaclass;
-
- my $code = eval 'sub {'
- . $meta_instance->inline_set_slot_value('$_[0]', "'$attr_name'", '$_[1]') . ' if scalar(@_) == 2; '
- . $meta_instance->inline_get_slot_value('$_[0]', "'$attr_name'")
- . '}';
- confess "Could not generate inline accessor because : $@" if $@;
-
- return $code;
-}
-
-sub generate_reader_method {
- my $attr = shift;
- return sub {
- confess "Cannot assign a value to a read-only accessor" if @_ > 1;
- $attr->get_value( $_[0] );
- };
-}
-
-sub generate_reader_method_inline {
- my $self = shift;
- my $attr_name = $self->name;
- my $meta_instance = $self->associated_class->instance_metaclass;
-
- my $code = eval 'sub {'
- . 'confess "Cannot assign a value to a read-only accessor" if @_ > 1;'
- . $meta_instance->inline_get_slot_value('$_[0]', "'$attr_name'")
- . '}';
- confess "Could not generate inline accessor because : $@" if $@;
-
- return $code;
-}
-
-sub generate_writer_method {
- my $attr = shift;
- return sub {
- $attr->set_value( $_[0], $_[1] );
- };
+ ->get_slot_value($instance, $self->name);
}
-sub generate_writer_method_inline {
- my $self = shift;
- my $attr_name = $self->name;
- my $meta_instance = $self->associated_class->instance_metaclass;
-
- my $code = eval 'sub {'
- . $meta_instance->inline_set_slot_value('$_[0]', "'$attr_name'", '$_[1]')
- . '}';
- confess "Could not generate inline accessor because : $@" if $@;
-
- return $code;
+sub has_value {
+ my ($self, $instance) = @_;
+
+ defined Class::MOP::Class->initialize(blessed($instance))
+ ->get_meta_instance
+ ->get_slot_value($instance, $self->name) ? 1 : 0;
}
-sub generate_predicate_method {
- my $self = shift;
- my $attr_name = $self->name;
- return sub {
- defined Class::MOP::Class->initialize(Scalar::Util::blessed($_[0]))
- ->get_meta_instance
- ->get_slot_value($_[0], $attr_name) ? 1 : 0;
- };
+sub clear_value {
+ my ($self, $instance) = @_;
+
+ Class::MOP::Class->initialize(blessed($instance))
+ ->get_meta_instance
+ ->deinitialize_slot($instance, $self->name);
}
-sub generate_predicate_method_inline {
- my $self = shift;
- my $attr_name = $self->name;
- my $meta_instance = $self->associated_class->instance_metaclass;
+## load em up ...
- my $code = eval 'sub {'
- . 'defined ' . $meta_instance->inline_get_slot_value('$_[0]', "'$attr_name'") . ' ? 1 : 0'
- . '}';
- confess "Could not generate inline accessor because : $@" if $@;
-
- return $code;
-}
+sub accessor_metaclass { 'Class::MOP::Method::Accessor' }
sub process_accessors {
my ($self, $type, $accessor, $generate_as_inline_methods) = @_;
if (reftype($accessor)) {
(reftype($accessor) eq 'HASH')
- || confess "bad accessor/reader/writer/predicate format, must be a HASH ref";
+ || confess "bad accessor/reader/writer/predicate/clearer format, must be a HASH ref";
my ($name, $method) = %{$accessor};
- return ($name, Class::MOP::Attribute::Accessor->wrap($method));
+ $method = $self->accessor_metaclass->wrap($method);
+ $self->associate_method($method);
+ return ($name, $method);
}
else {
- my $inline_me = ($generate_as_inline_methods && $self->associated_class->instance_metaclass->is_inlinable);
- my $generator = $self->can('generate_' . $type . '_method' . ($inline_me ? '_inline' : ''));
- ($generator)
- || confess "There is no method generator for the type='$type'";
- if (my $method = $self->$generator($self->name)) {
- return ($accessor => Class::MOP::Attribute::Accessor->wrap($method));
- }
- confess "Could not create the '$type' method for " . $self->name . " because : $@";
+ my $inline_me = ($generate_as_inline_methods && $self->associated_class->instance_metaclass->is_inlinable);
+ my $method;
+ eval {
+ $method = $self->accessor_metaclass->new(
+ attribute => $self,
+ as_inline => $inline_me,
+ accessor_type => $type,
+ );
+ };
+ confess "Could not create the '$type' method for " . $self->name . " because : $@" if $@;
+ $self->associate_method($method);
+ return ($accessor, $method);
}
}
$self->process_accessors('predicate' => $self->predicate(), $inline)
) if $self->has_predicate();
+ $class->add_method(
+ $self->process_accessors('clearer' => $self->clearer(), $inline)
+ ) if $self->has_clearer();
+
return;
}
}
my $method = $class->get_method($accessor);
$class->remove_method($accessor)
- if (blessed($method) && $method->isa('Class::MOP::Attribute::Accessor'));
+ if (blessed($method) && $method->isa('Class::MOP::Method::Accessor'));
};
sub remove_accessors {
$_remove_accessor->($self->reader(), $self->associated_class()) if $self->has_reader();
$_remove_accessor->($self->writer(), $self->associated_class()) if $self->has_writer();
$_remove_accessor->($self->predicate(), $self->associated_class()) if $self->has_predicate();
+ $_remove_accessor->($self->clearer(), $self->associated_class()) if $self->has_clearer();
return;
}
}
-package Class::MOP::Attribute::Accessor;
-
-use strict;
-use warnings;
-
-use Class::MOP::Method;
-
-our $VERSION = '0.01';
-
-our @ISA = ('Class::MOP::Method');
-
1;
__END__
=back
-The I<accessor>, I<reader>, I<writer> and I<predicate> keys can
-contain either; the name of the method and an appropriate default
-one will be generated for you, B<or> a HASH ref containing exactly one
-key (which will be used as the name of the method) and one value,
-which should contain a CODE reference which will be installed as
-the method itself.
+The I<accessor>, I<reader>, I<writer>, I<predicate> and I<clearer> keys can
+contain either; the name of the method and an appropriate default one will be
+generated for you, B<or> a HASH ref containing exactly one key (which will be
+used as the name of the method) and one value, which should contain a CODE
+reference which will be installed as the method itself.
=over 4
C<undef>. It will return true (C<1>) if the attribute's value is
defined, and false (C<0>) otherwise.
+=item I<clearer>
+
+This is the a method that will uninitialize the attr, reverting lazy values
+back to their "unfulfilled" state.
+
=back
=item B<clone (%options)>
=over 4
-=item set_value $instance, $value
+=item B<set_value ($instance, $value)>
Set the value without going through the accessor. Note that this may be done to
even attributes with just read only accessors.
-=item get_value $instance
+=item B<get_value ($instance)>
Return the value without going through the accessor. Note that this may be done
even to attributes with just write only accessors.
+=item B<has_value ($instance)>
+
+=item B<clear_value ($instance)>
+
=back
=head2 Informational
=item B<predicate>
+=item B<clearer>
+
=item B<init_arg>
=item B<is_default_a_coderef>
=item B<has_predicate>
+=item B<has_clearer>
+
=item B<has_init_arg>
=item B<has_default>
=item B<detach_from_class>
-=item B<slot_name>
-
-=item B<allocate_slots>
-
-=item B<deallocate_slots>
-
=back
=head2 Attribute Accessor generation
=over 4
+=item B<accessor_metaclass>
+
+=item B<associate_method>
+
+=item B<associated_methods>
+
=item B<install_accessors>
This allows the attribute to generate and install code for it's own
(using the C<generate_*_method> methods listed below) or it will
use the custom method passed through the constructor.
-=over 4
-
-=item B<generate_accessor_method>
-
-=item B<generate_predicate_method>
-
-=item B<generate_reader_method>
-
-=item B<generate_writer_method>
-
-=back
-
-=over 4
-
-=item B<generate_accessor_method_inline>
-
-=item B<generate_predicate_method_inline>
-
-=item B<generate_reader_method_inline>
-
-=item B<generate_writer_method_inline>
-
-=back
-
=item B<remove_accessors>
This allows the attribute to remove the method for it's own
-I<accessor/reader/writer/predicate>. This is called by
+I<accessor/reader/writer/predicate/clearer>. This is called by
C<Class::MOP::Class::remove_attribute>.
=back
=back
-=head1 AUTHOR
+=head1 AUTHORS
Stevan Little E<lt>stevan@iinteractive.comE<gt>
+Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
+
=head1 COPYRIGHT AND LICENSE
Copyright 2006 by Infinity Interactive, Inc.
=cut
+
projects / gitmo/Class-MOP.git / blobdiff