2 package # hide the package from PAUSE
10 use base 'Class::MOP::Attribute';
12 Perl6Attribute->meta->add_around_method_modifier('new' => sub {
14 my ($class, $attribute_name, %options) = @_;
16 # extract the sigil and accessor name
17 my ($sigil, $accessor_name) = ($attribute_name =~ /^([\$\@\%])\.(.*)$/);
19 # pass the accessor name
20 $options{accessor} = $accessor_name;
22 # create a default value based on the sigil
23 $options{default} = sub { [] } if ($sigil eq '@');
24 $options{default} = sub { {} } if ($sigil eq '%');
26 $cont->($class, $attribute_name, %options);
37 Perl6Attribute - An example attribute metaclass for Perl 6 style attributes
43 Foo->meta->add_attribute(Perl6Attribute->new('$.foo'));
44 Foo->meta->add_attribute(Perl6Attribute->new('@.bar'));
45 Foo->meta->add_attribute(Perl6Attribute->new('%.baz'));
49 $class->meta->new_object(@_);
54 This is an attribute metaclass which implements Perl 6 style
55 attributes, including the auto-generating accessors.
57 This code is very simple, we only need to subclass
58 C<Class::MOP::Attribute> and override C<&new>. Then we just
59 pre-process the attribute name, and create the accessor name
60 and default value based on it.
62 More advanced features like the C<handles> trait (see
63 L<Perl6::Bible/A12>) can be accomplished as well doing the
64 same pre-processing approach. This is left as an exercise to
65 the reader though (if you do it, please send me a patch
66 though, and will update this).
70 Stevan Little E<lt>stevan@iinteractive.comE<gt>
72 Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
74 =head1 COPYRIGHT AND LICENSE
76 Copyright 2006-2008 by Infinity Interactive, Inc.
78 L<http://www.iinteractive.com>
80 This library is free software; you can redistribute it and/or modify
81 it under the same terms as Perl itself.