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1 | package Catalyst::ClassData; |
2 | |
3 | use Moose::Role; |
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4 | use Moose::Meta::Class (); |
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5 | use Class::MOP; |
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6 | use Moose::Util (); |
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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 $meta = Moose::Util::find_meta($pkg) |
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17 | || Moose::Meta::Class->initialize( $pkg ); |
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18 | if (@_ > 1) { |
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19 | $meta->namespace->{$attribute} = \$_[1]; |
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20 | return $_[1]; |
21 | } |
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22 | |
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23 | # tighter version of |
24 | # if ( $meta->has_package_symbol($slot) ) { |
25 | # return ${ $meta->get_package_symbol($slot) }; |
26 | # } |
27 | no strict 'refs'; |
28 | my $v = *{"${pkg}::${attribute}"}{SCALAR}; |
29 | if (defined ${$v}) { |
30 | return ${$v}; |
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31 | } else { |
32 | foreach my $super ( $meta->linearized_isa ) { |
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33 | # tighter version of same after |
34 | # my $super_meta = Moose::Meta::Class->initialize($super); |
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35 | my $v = ${"${super}::"}{$attribute} ? *{"${super}::${attribute}"}{SCALAR} : undef; |
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36 | if (defined ${$v}) { |
37 | return ${$v}; |
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38 | } |
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39 | } |
40 | } |
41 | return; |
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42 | }; |
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43 | |
44 | confess("Failed to create accessor: $@ ") |
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45 | unless ref $accessor eq 'CODE'; |
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46 | |
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47 | my $meta = $class->Class::MOP::Object::meta(); |
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48 | confess "${class}'s metaclass is not a Class::MOP::Class" |
49 | unless $meta->isa('Class::MOP::Class'); |
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50 | |
51 | my $was_immutable = $meta->is_immutable; |
52 | $meta->make_mutable if $was_immutable; |
53 | |
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54 | my $alias = "_${attribute}_accessor"; |
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55 | $meta->add_method($alias, $accessor); |
56 | $meta->add_method($attribute, $accessor); |
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57 | |
58 | $meta->make_immutable if $was_immutable; |
59 | |
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60 | $class->$attribute($_[2]) if(@_ > 2); |
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61 | return $accessor; |
62 | } |
63 | |
64 | 1; |
65 | |
66 | __END__ |
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67 | |
68 | |
69 | =head1 NAME |
70 | |
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71 | Catalyst::ClassData - Class data accessors |
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72 | |
73 | =head1 METHODS |
74 | |
75 | =head2 mk_classdata $name, $optional_value |
76 | |
77 | A moose-safe clone of L<Class::Data::Inheritable> that borrows some ideas from |
78 | L<Class::Accessor::Grouped>; |
79 | |
80 | =head1 AUTHOR |
81 | |
82 | Guillermo Roditi |
83 | |
84 | =head1 COPYRIGHT |
85 | |
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86 | This library is free software. You can redistribute it and/or modify it under |
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87 | the same terms as Perl itself. |
88 | |
89 | =cut |