use strict;
use warnings;
+use Scalar::Util 'blessed';
+use Carp 'confess';
+
use MRO::Compat;
do {
my %METACLASS_CACHE;
+
+ # because Mouse doesn't introspect existing classes, we're forced to
+ # only pay attention to other Mouse classes
+ sub _metaclass_cache {
+ my $class = shift;
+ my $name = shift;
+ return $METACLASS_CACHE{$name};
+ }
+
sub initialize {
my $class = shift;
my $name = shift;
sub new {
my $class = shift;
- my %args = @_;
+ my %args = @_;
$args{attributes} = {};
$args{superclasses} = do {
$self->{'attributes'}{$attr->name} = $attr;
}
+sub compute_all_applicable_attributes {
+ my $self = shift;
+ my (@attr, %seen);
+
+ for my $class ($self->linearized_isa) {
+ my $meta = $self->_metaclass_cache($class)
+ or next;
+
+ for my $name (keys %{ $meta->get_attribute_map }) {
+ next if $seen{$name}++;
+ push @attr, $meta->get_attribute($name);
+ }
+ }
+
+ return @attr;
+}
+
sub get_attribute_map { $_[0]->{attributes} }
+sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
sub get_attribute { $_[0]->{attributes}->{$_[1]} }
sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } }
+sub clone_object {
+ my $class = shift;
+ my $instance = shift;
+
+ (blessed($instance) && $instance->isa($class->name))
+ || confess "You must pass an instance ($instance) of the metaclass (" . $class->name . ")";
+
+ $class->clone_instance($instance, @_);
+}
+
+sub clone_instance {
+ my ($class, $instance, %params) = @_;
+
+ (blessed($instance))
+ || confess "You can only clone instances, \$self is not a blessed instance";
+
+ my $clone = bless { %$instance }, ref $instance;
+
+ foreach my $attr ($class->compute_all_applicable_attributes()) {
+ if ( defined( my $init_arg = $attr->init_arg ) ) {
+ if (exists $params{$init_arg}) {
+ $clone->{ $attr->name } = $params{$init_arg};
+ }
+ }
+ }
+
+ return $clone;
+
+}
+
+
1;
__END__
Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
class.
+=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
+
+Returns the list of all L<Mouse::Meta::Attribute> instances associated with
+this class and its superclasses.
+
=head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
Returns a mapping of attribute names to their corresponding
L<Mouse::Meta::Attribute> objects.
+=head2 has_attribute Name -> Boool
+
+Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
+
=head2 get_attribute Name -> Mouse::Meta::Attribute | undef
Returns the L<Mouse::Meta::Attribute> with the given name.