use Class::MOP::Method::Wrapped;
use Class::MOP::Method::Accessor;
use Class::MOP::Method::Constructor;
-use Class::MOP::Method::Meta;
use Class::MOP::MiniTrait;
use Carp 'confess';
use Try::Tiny;
use List::MoreUtils 'all';
-our $VERSION = '1.09';
+our $VERSION = '1.11';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
my $old_metaclass = blessed($options{package})
? $options{package}
: Class::MOP::get_metaclass_by_name($options{package});
+ $options{weaken} = Class::MOP::metaclass_is_weak($old_metaclass->name)
+ if !exists $options{weaken}
+ && blessed($old_metaclass)
+ && $old_metaclass->isa('Class::MOP::Class');
$old_metaclass->_remove_generated_metaobjects
if $old_metaclass && $old_metaclass->isa('Class::MOP::Class');
- my $new_metaclass = $class->SUPER::reinitialize(@args);
+ my $new_metaclass = $class->SUPER::reinitialize(%options);
$new_metaclass->_restore_metaobjects_from($old_metaclass)
if $old_metaclass && $old_metaclass->isa('Class::MOP::Class');
return $new_metaclass;
# NOTE:
# we need to weaken any anon classes
# so that they can call DESTROY properly
- Class::MOP::weaken_metaclass($package_name) if $meta->is_anon_class;
+ Class::MOP::weaken_metaclass($package_name) if $options->{weaken};
$meta;
}
: ref $self;
}
-sub _meta_method_class { 'Class::MOP::Method::Meta' }
-
-sub _add_meta_method {
- my $self = shift;
- my $existing_method = $self->find_method_by_name('meta');
- return if $existing_method
- && $existing_method->isa($self->_meta_method_class);
- $self->add_method(
- 'meta' => $self->_meta_method_class->wrap(
- name => 'meta',
- package_name => $self->name,
- associated_metaclass => $self,
- )
- );
-}
-
sub _new {
my $class = shift;
}, $class;
}
-sub reset_package_cache_flag { (shift)->{'_package_cache_flag'} = undef }
-sub update_package_cache_flag {
- my $self = shift;
- # NOTE:
- # we can manually update the cache number
- # since we are actually adding the method
- # to our cache as well. This avoids us
- # having to regenerate the method_map.
- # - SL
- $self->{'_package_cache_flag'} = Class::MOP::check_package_cache_flag($self->name);
-}
-
## Metaclass compatibility
{
my %base_metaclass = (
sub create_anon_class {
my ($class, %options) = @_;
+ $options{weaken} = 1 unless exists $options{weaken};
my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL;
return $class->create($package_name, %options);
}
|| confess "You must pass a HASH ref of methods"
if exists $options{methods};
+ $options{meta_name} = 'meta'
+ unless exists $options{meta_name};
+
my (%initialize_options) = @args;
delete @initialize_options{qw(
package
superclasses
attributes
methods
- no_meta
+ meta_name
version
authority
)};
$meta->_instantiate_module( $options{version}, $options{authority} );
- $meta->_add_meta_method unless $options{no_meta};
+ $meta->_add_meta_method($options{meta_name})
+ if defined $options{meta_name};
$meta->superclasses(@{$options{superclasses}})
if exists $options{superclasses};
return $meta;
}
-## Attribute readers
-
-# NOTE:
-# all these attribute readers will be bootstrapped
-# away in the Class::MOP bootstrap section
-
-sub instance_metaclass { $_[0]->{'instance_metaclass'} }
-sub immutable_trait { $_[0]->{'immutable_trait'} }
-sub constructor_class { $_[0]->{'constructor_class'} }
-sub constructor_name { $_[0]->{'constructor_name'} }
-sub destructor_class { $_[0]->{'destructor_class'} }
-
# Instance Construction & Cloning
sub new_object {
foreach my $attr ($class->get_all_attributes()) {
$attr->initialize_instance_slot($meta_instance, $instance, $params);
}
- # NOTE:
- # this will only work for a HASH instance type
- if ($class->is_anon_class) {
- (reftype($instance) eq 'HASH')
- || confess "Currently only HASH based instances are supported with instance of anon-classes";
- # NOTE:
- # At some point we should make this official
- # as a reserved slot name, but right now I am
- # going to keep it here.
- # my $RESERVED_MOP_SLOT = '__MOP__';
- $instance->{'__MOP__'} = $class;
+ if (Class::MOP::metaclass_is_weak($class->name)) {
+ $meta_instance->_set_mop_slot($instance, $class);
}
return $instance;
}
+sub _inline_new_object {
+ my $self = shift;
+
+ return (
+ 'my $class = shift;',
+ '$class = Scalar::Util::blessed($class) || $class;',
+ $self->_inline_fallback_constructor('$class'),
+ $self->_inline_params('$params', '$class'),
+ $self->_inline_generate_instance('$instance', '$class'),
+ $self->_inline_slot_initializers,
+ $self->_inline_preserve_weak_metaclasses,
+ $self->_inline_extra_init,
+ 'return $instance',
+ );
+}
+
+sub _inline_fallback_constructor {
+ my $self = shift;
+ my ($class) = @_;
+ return (
+ 'return ' . $self->_generate_fallback_constructor($class),
+ 'if ' . $class . ' ne \'' . $self->name . '\';',
+ );
+}
+
+sub _generate_fallback_constructor {
+ my $self = shift;
+ my ($class) = @_;
+ return 'Class::MOP::Class->initialize(' . $class . ')->new_object(@_)',
+}
+
+sub _inline_params {
+ my $self = shift;
+ my ($params, $class) = @_;
+ return (
+ 'my ' . $params . ' = @_ == 1 ? $_[0] : {@_};',
+ );
+}
+
+sub _inline_generate_instance {
+ my $self = shift;
+ my ($inst, $class) = @_;
+ return (
+ 'my ' . $inst . ' = ' . $self->_inline_create_instance($class) . ';',
+ );
+}
+
+sub _inline_create_instance {
+ my $self = shift;
+
+ return $self->get_meta_instance->inline_create_instance(@_);
+}
+
+sub _inline_slot_initializers {
+ my $self = shift;
+
+ my $idx = 0;
+
+ return map { $self->_inline_slot_initializer($_, $idx++) }
+ sort { $a->name cmp $b->name } $self->get_all_attributes;
+}
+
+sub _inline_slot_initializer {
+ my $self = shift;
+ my ($attr, $idx) = @_;
+
+ my $default = $self->_inline_default_value($attr, $idx);
+
+ if (defined(my $init_arg = $attr->init_arg)) {
+ my @source = (
+ 'if (exists $params->{\'' . $init_arg . '\'}) {',
+ $attr->_inline_set_value(
+ '$instance', '$params->{\'' . $init_arg . '\'}'
+ ),
+ '}',
+ );
+ if (defined $default) {
+ push @source, (
+ 'else {',
+ $attr->_inline_set_value('$instance', $default),
+ '}',
+ );
+ }
+ return @source;
+ }
+ elsif (defined $default) {
+ return $attr->_inline_set_value('$instance', $default);
+ }
+ else {
+ return ();
+ }
+}
+
+sub _inline_default_value {
+ my $self = shift;
+ my ($attr, $index) = @_;
+
+ if ($attr->has_default) {
+ # NOTE:
+ # default values can either be CODE refs
+ # in which case we need to call them. Or
+ # they can be scalars (strings/numbers)
+ # in which case we can just deal with them
+ # in the code we eval.
+ if ($attr->is_default_a_coderef) {
+ return '$defaults->[' . $index . ']->($instance)';
+ }
+ else {
+ return '$defaults->[' . $index . ']';
+ }
+ }
+ elsif ($attr->has_builder) {
+ return '$instance->' . $attr->builder;
+ }
+ else {
+ return;
+ }
+}
+
+sub _inline_preserve_weak_metaclasses {
+ my $self = shift;
+ if (Class::MOP::metaclass_is_weak($self->name)) {
+ return (
+ $self->_inline_set_mop_slot(
+ '$instance', 'Class::MOP::class_of($class)'
+ ) . ';'
+ );
+ }
+ else {
+ return ();
+ }
+}
+
+sub _inline_extra_init { }
+
sub get_meta_instance {
my $self = shift;
return $instance;
}
-sub inline_create_instance {
+sub _inline_rebless_instance {
my $self = shift;
- return $self->get_meta_instance->inline_create_instance(@_);
+ return $self->get_meta_instance->inline_rebless_instance_structure(@_);
}
-sub inline_rebless_instance {
+sub _inline_get_mop_slot {
my $self = shift;
- return $self->get_meta_instance->inline_rebless_instance_structure(@_);
+ return $self->get_meta_instance->_inline_get_mop_slot(@_);
+}
+
+sub _inline_set_mop_slot {
+ my $self = shift;
+
+ return $self->get_meta_instance->_inline_set_mop_slot(@_);
+}
+
+sub _inline_clear_mop_slot {
+ my $self = shift;
+
+ return $self->get_meta_instance->_inline_clear_mop_slot(@_);
}
sub clone_object {
my $meta_instance = $self->get_meta_instance;
+ if (Class::MOP::metaclass_is_weak($old_metaclass->name)) {
+ $meta_instance->_clear_mop_slot($instance);
+ }
+
# rebless!
# we use $_[1] here because of t/306_rebless_overload.t regressions on 5.8.8
$meta_instance->rebless_instance_structure($_[1], $self);
$self->_fixup_attributes_after_rebless($instance, $old_metaclass, %params);
+
+ if (Class::MOP::metaclass_is_weak($self->name)) {
+ $meta_instance->_set_mop_slot($instance, $self);
+ }
}
sub rebless_instance {
sub superclasses {
my $self = shift;
- my $isa = $self->get_or_add_package_symbol(
- { sigil => '@', type => 'ARRAY', name => 'ISA' } );
+ my $isa = $self->get_or_add_package_symbol('@ISA');
if (@_) {
my @supers = @_;
sub _superclasses_updated {
my $self = shift;
$self->update_meta_instance_dependencies();
+ # keep strong references to all our parents, so they don't disappear if
+ # they are anon classes and don't have any direct instances
+ $self->_superclass_metas(
+ map { Class::MOP::class_of($_) } $self->superclasses
+ );
+}
+
+sub _superclass_metas {
+ my $self = shift;
+ $self->{_superclass_metas} = [@_];
}
sub subclasses {
An optional array reference of L<Class::MOP::Attribute> objects.
-=item * no_meta
+=item * meta_name
+
+Specifies the name to install the C<meta> method for this class under.
+If it is not passed, C<meta> is assumed, and if C<undef> is explicitly
+given, no meta method will be installed.
+
+=item * weaken
+
+If true, the metaclass that is stored in the global cache will be a
+weak reference.
+
+Classes created in this way are destroyed once the metaclass they are
+attached to goes out of scope, and will be removed from Perl's internal
+symbol table.
+
+All instances of a class with a weakened metaclass keep a special
+reference to the metaclass object, which prevents the metaclass from
+going out of scope while any instances exist.
-If true, a C<meta> method will not be installed into the class.
+This only works if the instance is based on a hash reference, however.
=back
It accepts the same C<superclasses>, C<methods>, and C<attributes>
parameters that C<create> accepts.
-Anonymous classes are destroyed once the metaclass they are attached
-to goes out of scope, and will be removed from Perl's internal symbol
-table.
-
-All instances of an anonymous class keep a special reference to the
-metaclass object, which prevents the metaclass from going out of scope
-while any instances exist.
-
-This only works if the instance is based on a hash reference, however.
+Anonymous classes default to C<< weaken => 1 >>, although this can be
+overridden.
=item B<< Class::MOP::Class->initialize($package_name, %options) >>
Returns an instance of the C<instance_metaclass> to be used in the
construction of a new instance of the class.
-=item B<< $metaclass->inline_create_instance($class_var) >>
-
-=item B<< $metaclass->inline_rebless_instance($instance_var, $class_var) >>
-
-These methods takes variable names, and use them to create an inline snippet
-of code that will create a new instance of the class.
-
=back
=head2 Informational predicates
projects / gitmo/Class-MOP.git / blobdiff