use Class::MOP::Method::Wrapped;
use Carp 'confess';
-use Scalar::Util 'blessed', 'reftype', 'weaken';
-use Sub::Name 'subname';
+use Scalar::Util 'blessed', 'weaken';
-our $VERSION = '0.26';
+our $VERSION = '0.65';
our $AUTHORITY = 'cpan:STEVAN';
use base 'Class::MOP::Module';
-# Self-introspection
-
-sub meta { Class::MOP::Class->initialize(blessed($_[0]) || $_[0]) }
-
# Creation
sub initialize {
my $package_name = shift;
(defined $package_name && $package_name && !blessed($package_name))
|| confess "You must pass a package name and it cannot be blessed";
- if (defined(my $meta = Class::MOP::get_metaclass_by_name($package_name))) {
- return $meta;
- }
- $class->construct_class_instance('package' => $package_name, @_);
+ return Class::MOP::get_metaclass_by_name($package_name)
+ || $class->construct_class_instance('package' => $package_name, @_);
}
sub reinitialize {
no strict 'refs';
$meta = bless {
# inherited from Class::MOP::Package
- '$!package' => $package_name,
+ 'package' => $package_name,
# NOTE:
# since the following attributes will
# listed here for reference, because they
# should not actually have a value associated
# with the slot.
- '%!namespace' => \undef,
+ 'namespace' => \undef,
# inherited from Class::MOP::Module
- '$!version' => \undef,
- '$!authority' => \undef,
+ 'version' => \undef,
+ 'authority' => \undef,
# defined in Class::MOP::Class
- '@!superclasses' => \undef,
+ 'superclasses' => \undef,
- '%!methods' => {},
- '%!attributes' => {},
- '$!attribute_metaclass' => $options{'attribute_metaclass'} || 'Class::MOP::Attribute',
- '$!method_metaclass' => $options{'method_metaclass'} || 'Class::MOP::Method',
- '$!instance_metaclass' => $options{'instance_metaclass'} || 'Class::MOP::Instance',
+ 'methods' => {},
+ 'attributes' => {},
+ 'attribute_metaclass' => $options{'attribute_metaclass'} || 'Class::MOP::Attribute',
+ 'method_metaclass' => $options{'method_metaclass'} || 'Class::MOP::Method',
+ 'instance_metaclass' => $options{'instance_metaclass'} || 'Class::MOP::Instance',
## uber-private variables
# NOTE:
# we can tell the first time the
# methods are fetched
# - SL
- '$!_package_cache_flag' => undef,
+ '_package_cache_flag' => undef,
+ '_meta_instance' => undef,
} => $class;
}
else {
$meta;
}
-sub reset_package_cache_flag { (shift)->{'$!_package_cache_flag'} = undef }
+sub reset_package_cache_flag { (shift)->{'_package_cache_flag'} = undef }
sub update_package_cache_flag {
my $self = shift;
# NOTE:
# 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);
+ $self->{'_package_cache_flag'} = Class::MOP::check_package_cache_flag($self->name);
}
sub check_metaclass_compatability {
"(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} . "';"
# all these attribute readers will be bootstrapped
# away in the Class::MOP bootstrap section
-sub get_attribute_map { $_[0]->{'%!attributes'} }
-sub attribute_metaclass { $_[0]->{'$!attribute_metaclass'} }
-sub method_metaclass { $_[0]->{'$!method_metaclass'} }
-sub instance_metaclass { $_[0]->{'$!instance_metaclass'} }
+sub get_attribute_map { $_[0]->{'attributes'} }
+sub attribute_metaclass { $_[0]->{'attribute_metaclass'} }
+sub method_metaclass { $_[0]->{'method_metaclass'} }
+sub instance_metaclass { $_[0]->{'instance_metaclass'} }
# FIXME:
# 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'};
+ 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 $map = $self->{'methods'};
my $class_name = $self->name;
my $method_metaclass = $self->method_metaclass;
- foreach my $symbol ($self->list_all_package_symbols('CODE')) {
- my $code = $self->get_package_symbol('&' . $symbol);
+ my %all_code = $self->get_all_package_symbols('CODE');
+
+ foreach my $symbol (keys %all_code) {
+ my $code = $all_code{$symbol};
next if exists $map->{$symbol} &&
defined $map->{$symbol} &&
$map->{$symbol}->body == $code;
my ($pkg, $name) = Class::MOP::get_code_info($code);
- next if ($pkg || '') ne $class_name &&
- ($name || '') ne '__ANON__';
+
+ # NOTE:
+ # in 5.10 constant.pm the constants show up
+ # as being in the right package, but in pre-5.10
+ # they show up as constant::__ANON__ so we
+ # make an exception here to be sure that things
+ # work as expected in both.
+ # - SL
+ unless ($pkg eq 'constant' && $name eq '__ANON__') {
+ next if ($pkg || '') ne $class_name ||
+ (($name || '') ne '__ANON__' && ($pkg || '') ne $class_name);
+ }
- $map->{$symbol} = $method_metaclass->wrap($code);
+ $map->{$symbol} = $method_metaclass->wrap(
+ $code,
+ package_name => $class_name,
+ name => $symbol,
+ );
}
return $map;
sub new_object {
my $class = shift;
+
# NOTE:
# we need to protect the integrity of the
# Class::MOP::Class singletons here, so we
# NOTE:
# this will only work for a HASH instance type
if ($class->is_anon_class) {
- (reftype($instance) eq 'HASH')
+ (Scalar::Util::reftype($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
return $instance;
}
+
sub get_meta_instance {
- my $class = shift;
- return $class->instance_metaclass->new(
- $class,
- $class->compute_all_applicable_attributes()
+ my $self = shift;
+ # NOTE:
+ # just about any fiddling with @ISA or
+ # any fiddling with attributes will
+ # also fiddle with the symbol table
+ # and therefore invalidate the package
+ # cache, in which case we should blow
+ # away the meta-instance cache. Of course
+ # this will invalidate it more often then
+ # is probably needed, but better safe
+ # then sorry.
+ # - SL
+ $self->{'_meta_instance'} = undef
+ if defined $self->{'_package_cache_flag'} &&
+ $self->{'_package_cache_flag'} == Class::MOP::check_package_cache_flag($self->name);
+ $self->{'_meta_instance'} ||= $self->instance_metaclass->new(
+ $self,
+ $self->compute_all_applicable_attributes()
);
}
my $class = shift;
my $instance = shift;
(blessed($instance) && $instance->isa($class->name))
- || confess "You must pass an instance ($instance) of the metaclass (" . $class->name . ")";
+ || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)";
+
# NOTE:
# we need to protect the integrity of the
# Class::MOP::Class singletons here, they
sub clone_instance {
my ($class, $instance, %params) = @_;
(blessed($instance))
- || confess "You can only clone instances, \$self is not a blessed instance";
+ || confess "You can only clone instances, ($instance) is not a blessed instance";
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 {
- my $self = shift;
+ my $self = shift;
+ my $var_spec = { sigil => '@', type => 'ARRAY', name => 'ISA' };
if (@_) {
my @supers = @_;
- @{$self->get_package_symbol('@ISA')} = @supers;
+ @{$self->get_package_symbol($var_spec)} = @supers;
# NOTE:
# we need to check the metaclass
# compatibility here so that we can
# we don't know about
$self->check_metaclass_compatability();
}
- @{$self->get_package_symbol('@ISA')};
+ @{$self->get_package_symbol($var_spec)};
}
sub subclasses {
sub linearized_isa {
- if (Class::MOP::IS_RUNNING_ON_5_10()) {
- return @{ mro::get_linear_isa( (shift)->name ) };
- }
- else {
- my %seen;
- return grep { !($seen{$_}++) } (shift)->class_precedence_list;
- }
+ return @{ mro::get_linear_isa( (shift)->name ) };
}
sub class_precedence_list {
my $self = shift;
+ my $name = $self->name;
unless (Class::MOP::IS_RUNNING_ON_5_10()) {
# NOTE:
# blow up otherwise. Yes, it's an ugly hack, better
# suggestions are welcome.
# - SL
- ($self->name || return)->isa('This is a test for circular inheritance')
+ ($name || return)->isa('This is a test for circular inheritance')
}
- (
- $self->name,
- map {
- $self->initialize($_)->class_precedence_list()
- } $self->superclasses()
- );
+ # if our mro is c3, we can
+ # just grab the linear_isa
+ if (mro::get_mro($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 $body;
if (blessed($method)) {
$body = $method->body;
+ if ($method->package_name ne $self->name &&
+ $method->name ne $method_name) {
+ warn "Hello there, got something for you."
+ . " Method says " . $method->package_name . " " . $method->name
+ . " Class says " . $self->name . " " . $method_name;
+ $method = $method->clone(
+ package_name => $self->name,
+ name => $method_name
+ ) if $method->can('clone');
+ }
}
else {
$body = $method;
- ('CODE' eq (reftype($body) || ''))
+ ('CODE' eq ref($body))
|| confess "Your code block must be a CODE reference";
- $method = $self->method_metaclass->wrap($body);
+ $method = $self->method_metaclass->wrap(
+ $body => (
+ package_name => $self->name,
+ name => $method_name
+ )
+ );
}
$self->get_method_map->{$method_name} = $method;
-
- my $full_method_name = ($self->name . '::' . $method_name);
- $self->add_package_symbol("&${method_name}" => subname $full_method_name => $body);
+
+ my $full_method_name = ($self->name . '::' . $method_name);
+ $self->add_package_symbol(
+ { sigil => '&', type => 'CODE', name => $method_name },
+ Class::MOP::subname($full_method_name => $body)
+ );
$self->update_package_cache_flag;
}
(defined $method_name && $method_name)
|| confess "You must pass in a method name";
my $method = $fetch_and_prepare_method->($self, $method_name);
- $method->add_before_modifier(subname ':before' => $method_modifier);
+ $method->add_before_modifier(
+ Class::MOP::subname(':before' => $method_modifier)
+ );
}
sub add_after_method_modifier {
(defined $method_name && $method_name)
|| confess "You must pass in a method name";
my $method = $fetch_and_prepare_method->($self, $method_name);
- $method->add_after_modifier(subname ':after' => $method_modifier);
+ $method->add_after_modifier(
+ Class::MOP::subname(':after' => $method_modifier)
+ );
}
sub add_around_method_modifier {
(defined $method_name && $method_name)
|| confess "You must pass in a method name";
my $method = $fetch_and_prepare_method->($self, $method_name);
- $method->add_around_modifier(subname ':around' => $method_modifier);
+ $method->add_around_modifier(
+ Class::MOP::subname(':around' => $method_modifier)
+ );
}
# NOTE:
|| confess "You must define a method name";
my $body = (blessed($method) ? $method->body : $method);
- ('CODE' eq (reftype($body) || ''))
+ ('CODE' eq ref($body))
|| confess "Your code block must be a CODE reference";
- $self->add_package_symbol("&${method_name}" => $body);
+ $self->add_package_symbol(
+ { sigil => '&', type => 'CODE', name => $method_name } => $body
+ );
$self->update_package_cache_flag;
}
my $removed_method = delete $self->get_method_map->{$method_name};
- $self->remove_package_symbol("&${method_name}");
+ $self->remove_package_symbol(
+ { sigil => '&', type => 'CODE', name => $method_name }
+ );
$self->update_package_cache_flag;
# the reference stored in $IMMUTABLE_TRANSFORMERS{$class} and ||= should DWIM
{
+
my %IMMUTABLE_TRANSFORMERS;
my %IMMUTABLE_OPTIONS;
+
+ sub get_immutable_options {
+ my $self = shift;
+ return if $self->is_mutable;
+ confess "unable to find immutabilizing options"
+ unless exists $IMMUTABLE_OPTIONS{$self->name};
+ my %options = %{$IMMUTABLE_OPTIONS{$self->name}};
+ delete $options{IMMUTABLE_TRANSFORMER};
+ return \%options;
+ }
+
+ sub get_immutable_transformer {
+ my $self = shift;
+ if( $self->is_mutable ){
+ my $class = blessed $self || $self;
+ return $IMMUTABLE_TRANSFORMERS{$class} ||= $self->create_immutable_transformer;
+ }
+ confess "unable to find transformer for immutable class"
+ unless exists $IMMUTABLE_OPTIONS{$self->name};
+ return $IMMUTABLE_OPTIONS{$self->name}->{IMMUTABLE_TRANSFORMER};
+ }
+
sub make_immutable {
my $self = shift;
my %options = @_;
- my $class = blessed $self || $self;
-
- $IMMUTABLE_TRANSFORMERS{$class} ||= $self->create_immutable_transformer;
- my $transformer = $IMMUTABLE_TRANSFORMERS{$class};
+ my $transformer = $self->get_immutable_transformer;
$transformer->make_metaclass_immutable($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{
confess "unable to find immutabilizing options" unless ref $options;
my $transformer = delete $options->{IMMUTABLE_TRANSFORMER};
$transformer->make_metaclass_mutable($self, $options);
+ 1;
}
}
sub create_immutable_transformer {
my $self = shift;
my $class = Class::MOP::Immutable->new($self, {
- read_only => [qw/superclasses/],
- cannot_call => [qw/
+ read_only => [qw/superclasses/],
+ cannot_call => [qw/
add_method
alias_method
remove_method
add_attribute
remove_attribute
- add_package_symbol
remove_package_symbol
- /],
- memoize => {
+ /],
+ memoize => {
class_precedence_list => 'ARRAY',
linearized_isa => 'ARRAY',
compute_all_applicable_attributes => 'ARRAY',
get_meta_instance => 'SCALAR',
get_method_map => 'SCALAR',
- }
+ },
+ # NOTE:
+ # this is ugly, but so are typeglobs,
+ # so whattayahgonnadoboutit
+ # - SL
+ wrapped => {
+ add_package_symbol => sub {
+ my $original = shift;
+ confess "Cannot add package symbols to an immutable metaclass"
+ unless (caller(2))[3] eq 'Class::MOP::Package::get_package_symbol';
+ goto $original->body;
+ },
+ },
});
return $class;
}
=item B<reset_package_cache_flag>
-Clear this flag, used in Moose.
+Clears the package cache flag to announce to the internals that we need
+to rebuild the method map.
=back
=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<$instance> to the class of the invoking
+C<Class::MOP::Class>. You may only rebless the instance to a subclass of
+itself. You may pass in optional C<%params> which are like constructor
+params and will override anything already defined in the instance.
+
=back
=head2 Informational
relationships of the class the B<Class::MOP::Class> instance is
associated with. Basically, it can get and set the C<@ISA> for you.
-B<NOTE:>
-Perl will occasionally perform some C<@ISA> and method caching, if
-you decide to change your superclass relationship at runtime (which
-is quite insane and very much not recommened), then you should be
-aware of this and the fact that this module does not make any
-attempt to address this issue.
-
=item B<class_precedence_list>
This computes the a list of all the class's ancestors in the same order
-in which method dispatch will be done. This is similair to
-what B<Class::ISA::super_path> does, but we don't remove duplicate names.
+in which method dispatch will be done. This is similair to what
+B<Class::ISA::super_path> does, but we don't remove duplicate names.
=item B<linearized_isa>
=item B<subclasses>
-This returns a list of subclasses for this class.
+This returns a list of subclasses for this class.
=back
=item B<get_method_map>
+Returns a HASH ref of name to CODE reference mapping for this class.
+
=item B<method_metaclass>
+Returns the class name of the method metaclass, see L<Class::MOP::Method>
+for more information on the method metaclasses.
+
=item B<add_method ($method_name, $method)>
This will take a C<$method_name> and CODE reference to that
The Class::MOP::Method is codifiable, so you can use it like a normal
CODE reference, see L<Class::MOP::Method> for more information.
-=item B<find_method_by_name ($method_name>
+=item B<find_method_by_name ($method_name)>
This will return a CODE reference of the specified C<$method_name>,
or return undef if that method does not exist.
=item B<attribute_metaclass>
+Returns the class name of the attribute metaclass, see L<Class::MOP::Attribute>
+for more information on the attribute metaclasses.
+
=item B<get_attribute_map>
-=item B<add_attribute ($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>
This method will reverse tranforamtion upon the class which
made it immutable.
+=item B<get_immutable_transformer>
+
+Return a transformer suitable for making this class immutable or, if this
+class is immutable, the transformer used to make it immutable.
+
+=item B<get_immutable_options>
+
+If the class is immutable, return the options used to make it immutable.
+
=item B<create_immutable_transformer>
Create a transformer suitable for making this class immutable
projects / gitmo/Class-MOP.git / blobdiff