use Carp 'confess';
use Scalar::Util 'blessed', 'reftype', 'weaken';
use Sub::Name 'subname';
-use B 'svref_2object';
-our $VERSION = '0.23';
+our $VERSION = '0.30';
our $AUTHORITY = 'cpan:STEVAN';
use base 'Class::MOP::Module';
-# Self-introspection
-
-sub meta { Class::MOP::Class->initialize(blessed($_[0]) || $_[0]) }
-
# Creation
sub initialize {
# now create the metaclass
my $meta;
- if ($class =~ /^Class::MOP::Class$/) {
+ if ($class eq 'Class::MOP::Class') {
no strict 'refs';
$meta = bless {
# inherited from Class::MOP::Package
'$!attribute_metaclass' => $options{'attribute_metaclass'} || 'Class::MOP::Attribute',
'$!method_metaclass' => $options{'method_metaclass'} || 'Class::MOP::Method',
'$!instance_metaclass' => $options{'instance_metaclass'} || 'Class::MOP::Instance',
+
+ ## uber-private variables
+ # NOTE:
+ # this starts out as undef so that
+ # we can tell the first time the
+ # methods are fetched
+ # - SL
+ '$!_package_cache_flag' => undef,
} => $class;
}
else {
}
# and check the metaclass compatibility
- $meta->check_metaclass_compatability();
+ $meta->check_metaclass_compatability();
Class::MOP::store_metaclass_by_name($package_name, $meta);
$meta;
}
+sub reset_package_cache_flag { (shift)->{'$!_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);
+}
+
sub check_metaclass_compatability {
my $self = shift;
return if blessed($self) eq 'Class::MOP::Class' &&
$self->instance_metaclass eq 'Class::MOP::Instance';
- my @class_list = $self->class_precedence_list;
+ my @class_list = $self->linearized_isa;
shift @class_list; # shift off $self->name
foreach my $class_name (@class_list) {
"(I found an uneven number of params in \@_)";
my (%options) = @_;
+
+ (ref $options{superclasses} eq 'ARRAY')
+ || confess "You must pass an ARRAY ref of superclasses"
+ if exists $options{superclasses};
+
+ (ref $options{attributes} eq 'ARRAY')
+ || confess "You must pass an ARRAY ref of attributes"
+ if exists $options{attributes};
+
+ (ref $options{methods} eq 'HASH')
+ || confess "You must pass an HASH ref of methods"
+ if exists $options{methods};
my $code = "package $package_name;";
$code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';"
# this is a prime canidate for conversion to XS
sub get_method_map {
my $self = shift;
+
+ if (defined $self->{'$!_package_cache_flag'} &&
+ $self->{'$!_package_cache_flag'} == Class::MOP::check_package_cache_flag($self->name)) {
+ return $self->{'%!methods'};
+ }
+
my $map = $self->{'%!methods'};
my $class_name = $self->name;
defined $map->{$symbol} &&
$map->{$symbol}->body == $code;
- my $gv = svref_2object($code)->GV;
- next if ($gv->STASH->NAME || '') ne $class_name &&
- ($gv->NAME || '') ne '__ANON__';
+ my ($pkg, $name) = Class::MOP::get_code_info($code);
+ next if ($pkg || '') ne $class_name &&
+ ($name || '') ne '__ANON__';
$map->{$symbol} = $method_metaclass->wrap($code);
}
my $meta_instance = $class->get_meta_instance();
my $clone = $meta_instance->clone_instance($instance);
foreach my $attr ($class->compute_all_applicable_attributes()) {
- if (exists $params{$attr->init_arg}) {
- $meta_instance->set_slot_value($clone, $attr->name, $params{$attr->init_arg});
+ if ( defined( my $init_arg = $attr->init_arg ) ) {
+ if (exists $params{$init_arg}) {
+ $attr->set_value($clone, $params{$init_arg});
+ }
}
}
return $clone;
}
+sub rebless_instance {
+ my ($self, $instance, %params) = @_;
+
+ my $old_metaclass;
+ if ($instance->can('meta')) {
+ ($instance->meta->isa('Class::MOP::Class'))
+ || confess 'Cannot rebless instance if ->meta is not an instance of Class::MOP::Class';
+ $old_metaclass = $instance->meta;
+ }
+ else {
+ $old_metaclass = $self->initialize(blessed($instance));
+ }
+
+ my $meta_instance = $self->get_meta_instance();
+
+ $self->name->isa($old_metaclass->name)
+ || confess "You may rebless only into a subclass of (". $old_metaclass->name ."), of which (". $self->name .") isn't.";
+
+ # rebless!
+ $meta_instance->rebless_instance_structure($instance, $self);
+
+ foreach my $attr ( $self->compute_all_applicable_attributes ) {
+ if ( $attr->has_value($instance) ) {
+ if ( defined( my $init_arg = $attr->init_arg ) ) {
+ $params{$init_arg} = $attr->get_value($instance)
+ unless exists $params{$init_arg};
+ }
+ else {
+ $attr->set_value($instance, $attr->get_value($instance));
+ }
+ }
+ }
+
+ foreach my $attr ($self->compute_all_applicable_attributes) {
+ $attr->initialize_instance_slot($meta_instance, $instance, \%params);
+ }
+
+ $instance;
+}
+
# Inheritance
sub superclasses {
@{$self->get_package_symbol('@ISA')} = @supers;
# NOTE:
# we need to check the metaclass
- # compatability here so that we can
+ # compatibility here so that we can
# be sure that the superclass is
# not potentially creating an issues
# we don't know about
@{$self->get_package_symbol('@ISA')};
}
+sub subclasses {
+ my $self = shift;
+
+ my $super_class = $self->name;
+ my @derived_classes;
+
+ my $find_derived_classes;
+ $find_derived_classes = sub {
+ my ($outer_class) = @_;
+
+ my $symbol_table_hashref = do { no strict 'refs'; \%{"${outer_class}::"} };
+
+ SYMBOL:
+ for my $symbol ( keys %$symbol_table_hashref ) {
+ next SYMBOL if $symbol !~ /\A (\w+):: \z/x;
+ my $inner_class = $1;
+
+ next SYMBOL if $inner_class eq 'SUPER'; # skip '*::SUPER'
+
+ my $class =
+ $outer_class
+ ? "${outer_class}::$inner_class"
+ : $inner_class;
+
+ if ( $class->isa($super_class) and $class ne $super_class ) {
+ push @derived_classes, $class;
+ }
+
+ next SYMBOL if $class eq 'main'; # skip 'main::*'
+
+ $find_derived_classes->($class);
+ }
+ };
+
+ my $root_class = q{};
+ $find_derived_classes->($root_class);
+
+ undef $find_derived_classes;
+
+ @derived_classes = sort { $a->isa($b) ? 1 : $b->isa($a) ? -1 : 0 } @derived_classes;
+
+ return @derived_classes;
+}
+
+
+sub linearized_isa {
+ return @{ mro::get_linear_isa( (shift)->name ) };
+}
+
sub class_precedence_list {
my $self = shift;
- # NOTE:
- # We need to check for ciruclar inheirtance here.
- # This will do nothing if all is well, and blow
- # up otherwise. Yes, it's an ugly hack, better
- # suggestions are welcome.
- { ($self->name || return)->isa('This is a test for circular inheritance') }
-
- (
- $self->name,
- map {
- $self->initialize($_)->class_precedence_list()
- } $self->superclasses()
- );
+ my $name = $self->name;
+
+ unless (Class::MOP::IS_RUNNING_ON_5_10()) {
+ # NOTE:
+ # We need to check for circular inheritance here
+ # if we are are not on 5.10, cause 5.8 detects it
+ # late. This will do nothing if all is well, and
+ # blow up otherwise. Yes, it's an ugly hack, better
+ # suggestions are welcome.
+ # - SL
+ ($name || return)->isa('This is a test for circular inheritance')
+ }
+
+ # if our mro is c3, we can
+ # just grab the linear_isa
+ if (mro::get_mro($name) eq 'c3') {
+ return @{ mro::get_linear_isa($name) }
+ }
+ else {
+ # NOTE:
+ # we can't grab the linear_isa for dfs
+ # since it has all the duplicates
+ # already removed.
+ return (
+ $name,
+ map {
+ $self->initialize($_)->class_precedence_list()
+ } $self->superclasses()
+ );
+ }
}
## Methods
my $full_method_name = ($self->name . '::' . $method_name);
$self->add_package_symbol("&${method_name}" => subname $full_method_name => $body);
+ $self->update_package_cache_flag;
}
{
|| confess "Your code block must be a CODE reference";
$self->add_package_symbol("&${method_name}" => $body);
+ $self->update_package_cache_flag;
}
sub has_method {
(defined $method_name && $method_name)
|| confess "You must define a method name";
- my $removed_method = $self->get_method($method_name);
-
- do {
- $self->remove_package_symbol("&${method_name}");
- delete $self->get_method_map->{$method_name};
- } if defined $removed_method;
+ my $removed_method = delete $self->get_method_map->{$method_name};
+
+ $self->remove_package_symbol("&${method_name}");
+
+ $self->update_package_cache_flag;
return $removed_method;
}
my ($self, $method_name) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name to find";
- # keep a record of what we have seen
- # here, this will handle all the
- # inheritence issues because we are
- # using the &class_precedence_list
- my %seen_class;
- my @cpl = $self->class_precedence_list();
- foreach my $class (@cpl) {
- next if $seen_class{$class};
- $seen_class{$class}++;
+ foreach my $class ($self->linearized_isa) {
# fetch the meta-class ...
my $meta = $self->initialize($class);
return $meta->get_method($method_name)
sub compute_all_applicable_methods {
my $self = shift;
- my @methods;
- # keep a record of what we have seen
- # here, this will handle all the
- # inheritence issues because we are
- # using the &class_precedence_list
- my (%seen_class, %seen_method);
- foreach my $class ($self->class_precedence_list()) {
- next if $seen_class{$class};
- $seen_class{$class}++;
+ my (@methods, %seen_method);
+ foreach my $class ($self->linearized_isa) {
# fetch the meta-class ...
my $meta = $self->initialize($class);
foreach my $method_name ($meta->get_method_list()) {
(defined $method_name && $method_name)
|| confess "You must define a method name to find";
my @methods;
- # keep a record of what we have seen
- # here, this will handle all the
- # inheritence issues because we are
- # using the &class_precedence_list
- my %seen_class;
- foreach my $class ($self->class_precedence_list()) {
- next if $seen_class{$class};
- $seen_class{$class}++;
+ foreach my $class ($self->linearized_isa) {
# fetch the meta-class ...
my $meta = $self->initialize($class);
push @methods => {
my ($self, $method_name) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name to find";
- # keep a record of what we have seen
- # here, this will handle all the
- # inheritence issues because we are
- # using the &class_precedence_list
- my %seen_class;
- my @cpl = $self->class_precedence_list();
+ my @cpl = $self->linearized_isa;
shift @cpl; # discard ourselves
foreach my $class (@cpl) {
- next if $seen_class{$class};
- $seen_class{$class}++;
# fetch the meta-class ...
my $meta = $self->initialize($class);
return $meta->get_method($method_name)
sub compute_all_applicable_attributes {
my $self = shift;
- my @attrs;
- # keep a record of what we have seen
- # here, this will handle all the
- # inheritence issues because we are
- # using the &class_precedence_list
- my (%seen_class, %seen_attr);
- foreach my $class ($self->class_precedence_list()) {
- next if $seen_class{$class};
- $seen_class{$class}++;
+ my (@attrs, %seen_attr);
+ foreach my $class ($self->linearized_isa) {
# fetch the meta-class ...
my $meta = $self->initialize($class);
foreach my $attr_name ($meta->get_attribute_list()) {
sub find_attribute_by_name {
my ($self, $attr_name) = @_;
- # keep a record of what we have seen
- # here, this will handle all the
- # inheritence issues because we are
- # using the &class_precedence_list
- my %seen_class;
- foreach my $class ($self->class_precedence_list()) {
- next if $seen_class{$class};
- $seen_class{$class}++;
+ foreach my $class ($self->linearized_isa) {
# fetch the meta-class ...
my $meta = $self->initialize($class);
return $meta->get_attribute($attr_name)
$IMMUTABLE_TRANSFORMERS{$class} ||= $self->create_immutable_transformer;
my $transformer = $IMMUTABLE_TRANSFORMERS{$class};
- $transformer->make_metaclass_immutable($self, %options);
+ $transformer->make_metaclass_immutable($self, \%options);
$IMMUTABLE_OPTIONS{$self->name} =
{ %options, IMMUTABLE_TRANSFORMER => $transformer };
print STDERR "# of Metaclass options: ", keys %IMMUTABLE_OPTIONS;
print STDERR "# of Immutable transformers: ", keys %IMMUTABLE_TRANSFORMERS;
}
+
+ 1;
}
sub make_mutable{
my $options = delete $IMMUTABLE_OPTIONS{$self->name};
confess "unable to find immutabilizing options" unless ref $options;
my $transformer = delete $options->{IMMUTABLE_TRANSFORMER};
- $transformer->make_metaclass_mutable($self, %$options);
+ $transformer->make_metaclass_mutable($self, $options);
+ 1;
}
}
/],
memoize => {
class_precedence_list => 'ARRAY',
+ linearized_isa => 'ARRAY',
compute_all_applicable_attributes => 'ARRAY',
get_meta_instance => 'SCALAR',
get_method_map => 'SCALAR',
your ancestors. For more inforamtion about metaclass compatibility
see the C<About Metaclass compatibility> section in L<Class::MOP>.
+=item B<update_package_cache_flag>
+
+This will reset the package cache flag for this particular metaclass
+it is basically the value of the C<Class::MOP::get_package_cache_flag>
+function. This is very rarely needed from outside of C<Class::MOP::Class>
+but in some cases you might want to use it, so it is here.
+
+=item B<reset_package_cache_flag>
+
+Clears the package cache flag to announce to the internals that we need
+to rebuild the method map.
+
=back
=head2 Object instance construction and cloning
=item B<instance_metaclass>
+Returns the class name of the instance metaclass, see L<Class::MOP::Instance>
+for more information on the instance metaclasses.
+
=item B<get_meta_instance>
+Returns an instance of L<Class::MOP::Instance> to be used in the construction
+of a new instance of the class.
+
=item B<new_object (%params)>
This is a convience method for creating a new object of the class, and
$class->meta->new_object(%params);
}
-Of course the ideal place for this would actually be in C<UNIVERSAL::>
-but that is considered bad style, so we do not do that.
-
=item B<construct_instance (%params)>
-This method is used to construct an instace structure suitable for
+This method is used to construct an instance structure suitable for
C<bless>-ing into your package of choice. It works in conjunction
with the Attribute protocol to collect all applicable attributes.
$self->meta->clone_object($self, %params);
}
-Of course the ideal place for this would actually be in C<UNIVERSAL::>
-but that is considered bad style, so we do not do that.
-
=item B<clone_instance($instance, %params)>
This method is a compliment of C<construct_instance> (which means if
think Yuval "nothingmuch" Kogman put it best when he said that cloning
is too I<context-specific> to be part of the MOP.
+=item B<rebless_instance($instance, ?%params)>
+
+This will change the class of C<$instance> to the class of the invoking
+C<Class::MOP::Class>. You may only rebless the instance to a subclass of
+itself. You may pass in optional C<%params> which are like constructor
+params and will override anything already defined in the instance.
+
=back
=head2 Informational
relationships of the class the B<Class::MOP::Class> instance is
associated with. Basically, it can get and set the C<@ISA> for you.
-B<NOTE:>
-Perl will occasionally perform some C<@ISA> and method caching, if
-you decide to change your superclass relationship at runtime (which
-is quite insane and very much not recommened), then you should be
-aware of this and the fact that this module does not make any
-attempt to address this issue.
-
=item B<class_precedence_list>
This computes the a list of all the class's ancestors in the same order
-in which method dispatch will be done. This is similair to
-what B<Class::ISA::super_path> does, but we don't remove duplicate names.
+in which method dispatch will be done. This is similair to what
+B<Class::ISA::super_path> does, but we don't remove duplicate names.
+
+=item B<linearized_isa>
+
+This returns a list based on C<class_precedence_list> but with all
+duplicates removed.
+
+=item B<subclasses>
+
+This returns a list of subclasses for this class.
=back
=item B<get_method_map>
+Returns a HASH ref of name to CODE reference mapping for this class.
+
=item B<method_metaclass>
+Returns the class name of the method metaclass, see L<Class::MOP::Method>
+for more information on the method metaclasses.
+
=item B<add_method ($method_name, $method)>
This will take a C<$method_name> and CODE reference to that
=item B<attribute_metaclass>
+Returns the class name of the attribute metaclass, see L<Class::MOP::Attribute>
+for more information on the attribute metaclasses.
+
=item B<get_attribute_map>
-=item B<add_attribute ($attribute_meta_object | $attribute_name, %attribute_spec)>
+This returns a HASH ref of name to attribute meta-object mapping.
+
+=item B<add_attribute ($attribute_meta_object | ($attribute_name, %attribute_spec))>
This stores the C<$attribute_meta_object> (or creates one from the
C<$attribute_name> and C<%attribute_spec>) in the B<Class::MOP::Class>
=head1 COPYRIGHT AND LICENSE
-Copyright 2006, 2007 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
projects / gitmo/Class-MOP.git / blobdiff