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1 | package Catalyst::ClassData; |
2 | |
3 | use Moose::Role; |
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4 | use Class::MOP; |
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5 | use Class::MOP::Object; |
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6 | use Scalar::Util 'blessed'; |
7 | |
8 | sub mk_classdata { |
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9 | my ($class, $attribute) = @_; |
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10 | confess("mk_classdata() is a class method, not an object method") |
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11 | if blessed $class; |
12 | |
13 | my $slot = '$'.$attribute; |
14 | my $accessor = sub { |
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15 | my $pkg = ref $_[0] || $_[0]; |
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16 | my $meta = $pkg->Class::MOP::Object::meta(); |
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17 | if (@_ > 1) { |
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18 | $meta->namespace->{$attribute} = \$_[1]; |
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19 | return $_[1]; |
20 | } |
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21 | |
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22 | # tighter version of |
23 | # if ( $meta->has_package_symbol($slot) ) { |
24 | # return ${ $meta->get_package_symbol($slot) }; |
25 | # } |
26 | no strict 'refs'; |
27 | my $v = *{"${pkg}::${attribute}"}{SCALAR}; |
28 | if (defined ${$v}) { |
29 | return ${$v}; |
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30 | } else { |
31 | foreach my $super ( $meta->linearized_isa ) { |
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32 | # tighter version of same after |
33 | # my $super_meta = Moose::Meta::Class->initialize($super); |
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34 | my $v = ${"${super}::"}{$attribute} ? *{"${super}::${attribute}"}{SCALAR} : undef; |
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35 | if (defined ${$v}) { |
36 | return ${$v}; |
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37 | } |
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38 | } |
39 | } |
40 | return; |
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41 | }; |
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42 | |
43 | confess("Failed to create accessor: $@ ") |
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44 | unless ref $accessor eq 'CODE'; |
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45 | |
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46 | my $meta = $class->Class::MOP::Object::meta(); |
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47 | my $immutable_options; |
48 | if( $meta->is_immutable ){ |
49 | $immutable_options = $meta->get_immutable_options; |
50 | $meta->make_mutable; |
51 | } |
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52 | my $alias = "_${attribute}_accessor"; |
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53 | $meta->add_method($alias, $accessor); |
54 | $meta->add_method($attribute, $accessor); |
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55 | if(defined $immutable_options){ |
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56 | $meta->make_immutable(%{ $immutable_options }); |
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57 | } |
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58 | $class->$attribute($_[2]) if(@_ > 2); |
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59 | return $accessor; |
60 | } |
61 | |
62 | 1; |
63 | |
64 | __END__ |
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65 | |
66 | |
67 | =head1 NAME |
68 | |
69 | Catalyst::ClassData - Class data acessors |
70 | |
71 | =head1 METHODS |
72 | |
73 | =head2 mk_classdata $name, $optional_value |
74 | |
75 | A moose-safe clone of L<Class::Data::Inheritable> that borrows some ideas from |
76 | L<Class::Accessor::Grouped>; |
77 | |
78 | =head1 AUTHOR |
79 | |
80 | Guillermo Roditi |
81 | |
82 | =head1 COPYRIGHT |
83 | |
84 | This program is free software, you can redistribute it and/or modify it under |
85 | the same terms as Perl itself. |
86 | |
87 | =cut |