Create branch register_actions.

[catagits/Catalyst-Runtime.git] / lib / Catalyst / ClassData.pm

diff --git a/lib/Catalyst/ClassData.pm b/lib/Catalyst/ClassData.pm
new file mode 100644 (file)
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+++ b/lib/Catalyst/ClassData.pm
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+package Catalyst::ClassData;
+
+use Moose::Role;
+use Class::MOP;
+use Class::MOP::Object;
+
+sub mk_classdata {
+  my ($class, $attribute) = @_;
+  confess("mk_classdata() is a class method, not an object method")
+    if blessed $class;
+
+  my $slot = '$'.$attribute;
+  my $accessor =  sub {
+    my $pkg = ref $_[0] || $_[0];
+    # Hack - delberately create a metaclass instance
+    my $meta = $pkg->Class::MOP::Object::meta();
+    if (@_ > 1) {
+      $meta->namespace->{$attribute} = \$_[1];
+      return $_[1];
+    }
+
+    # tighter version of
+    # if ( $meta->has_package_symbol($slot) ) {
+    #   return ${ $meta->get_package_symbol($slot) };
+    # }
+    no strict 'refs';
+    my $v = *{"${pkg}::${attribute}"}{SCALAR};
+    if (defined ${$v}) {
+     return ${$v};
+    } else {
+      foreach my $super ( $meta->linearized_isa ) {
+        # tighter version of same after
+        # my $super_meta = Moose::Meta::Class->initialize($super);
+        my $v = ${"${super}::"}{$attribute} ? *{"${super}::${attribute}"}{SCALAR} : undef;
+        if (defined ${$v}) {
+          return ${$v};
+        }
+      }
+    }
+    return;
+  };
+
+  confess("Failed to create accessor: $@ ")
+    unless ref $accessor eq 'CODE';
+
+  my $meta = $class->Class::MOP::Object::meta();
+  my $immutable_options;
+  if( $meta->is_immutable ){
+    $immutable_options = $meta->get_immutable_options;
+    $meta->make_mutable;
+  }
+  my $alias = "_${attribute}_accessor";
+  $meta->add_method($alias, $accessor);
+  $meta->add_method($attribute, $accessor);
+  if(defined $immutable_options){
+    $meta->make_immutable(%{ $immutable_options });
+  }
+  $class->$attribute($_[2]) if(@_ > 2);
+  return $accessor;
+}
+
+1;
+
+__END__
+
+
+=head1 NAME
+
+Catalyst::ClassData - Class data accessors
+
+=head1 METHODS
+
+=head2 mk_classdata $name, $optional_value
+
+A moose-safe clone of L<Class::Data::Inheritable> that borrows some ideas from
+L<Class::Accessor::Grouped>;
+
+=head1 AUTHOR
+
+Guillermo Roditi
+
+=head1 COPYRIGHT
+
+This program is free software, you can redistribute it and/or modify it under
+the same terms as Perl itself.
+
+=cut