package # hide the package from PAUSE Perl6Attribute; use strict; use warnings; our $VERSION = '0.02'; use base 'Class::MOP::Attribute'; Perl6Attribute->meta->add_around_method_modifier('new' => sub { my $cont = shift; my ($class, $attribute_name, %options) = @_; # extract the sigil and accessor name my ($sigil, $accessor_name) = ($attribute_name =~ /^([\$\@\%])\.(.*)$/); # pass the accessor name $options{accessor} = $accessor_name; # create a default value based on the sigil $options{default} = sub { [] } if ($sigil eq '@'); $options{default} = sub { {} } if ($sigil eq '%'); $cont->($class, $attribute_name, %options); }); 1; __END__ =pod =head1 NAME Perl6Attribute - An example attribute metaclass for Perl 6 style attributes =head1 SYNOPSIS package Foo; Foo->meta->add_attribute(Perl6Attribute->new('$.foo')); Foo->meta->add_attribute(Perl6Attribute->new('@.bar')); Foo->meta->add_attribute(Perl6Attribute->new('%.baz')); sub new { my $class = shift; $class->meta->new_object(@_); } =head1 DESCRIPTION This is an attribute metaclass which implements Perl 6 style attributes, including the auto-generating accessors. This code is very simple, we only need to subclass C and override C<&new>. Then we just pre-process the attribute name, and create the accessor name and default value based on it. More advanced features like the C trait (see L) can be accomplished as well doing the same pre-processing approach. This is left as an exercise to the reader though (if you do it, please send me a patch though, and will update this). =head1 AUTHORS Stevan Little Estevan@iinteractive.comE Yuval Kogman Enothingmuch@woobling.comE =head1 COPYRIGHT AND LICENSE Copyright 2006-2008 by Infinity Interactive, Inc. L This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut