Commit | Line | Data |
c0e30cf5 |
1 | |
2 | package Moose::Meta::Attribute; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
a15dff8d |
7 | use Scalar::Util 'weaken', 'reftype'; |
8 | use Carp 'confess'; |
9 | |
10 | use Moose::Util::TypeConstraints ':no_export'; |
11 | |
5569c072 |
12 | our $VERSION = '0.02'; |
bc1e29b5 |
13 | |
c0e30cf5 |
14 | use base 'Class::MOP::Attribute'; |
15 | |
a15dff8d |
16 | Moose::Meta::Attribute->meta->add_attribute( |
17 | Class::MOP::Attribute->new('weak_ref' => ( |
18 | reader => 'weak_ref', |
19 | predicate => { |
20 | 'has_weak_ref' => sub { $_[0]->weak_ref() ? 1 : 0 } |
21 | } |
22 | )) |
23 | ); |
24 | |
25 | Moose::Meta::Attribute->meta->add_attribute( |
26 | Class::MOP::Attribute->new('type_constraint' => ( |
27 | reader => 'type_constraint', |
28 | predicate => 'has_type_constraint', |
29 | )) |
30 | ); |
31 | |
32 | Moose::Meta::Attribute->meta->add_before_method_modifier('new' => sub { |
33 | my (undef, undef, %options) = @_; |
34 | (reftype($options{type_constraint}) && reftype($options{type_constraint}) eq 'CODE') |
29db16a9 |
35 | || confess "Type cosntraint parameter must be a code-ref, not " . $options{type_constraint} |
36 | if exists $options{type_constraint}; |
c0e30cf5 |
37 | }); |
38 | |
a15dff8d |
39 | sub generate_accessor_method { |
40 | my ($self, $attr_name) = @_; |
41 | if ($self->has_type_constraint) { |
42 | if ($self->has_weak_ref) { |
43 | return sub { |
44 | if (scalar(@_) == 2) { |
45 | (defined $self->type_constraint->($_[1])) |
5569c072 |
46 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
47 | if defined $_[1]; |
48 | $_[0]->{$attr_name} = $_[1]; |
49 | weaken($_[0]->{$attr_name}); |
50 | } |
51 | $_[0]->{$attr_name}; |
52 | }; |
53 | } |
54 | else { |
55 | return sub { |
56 | if (scalar(@_) == 2) { |
57 | (defined $self->type_constraint->($_[1])) |
5569c072 |
58 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
59 | if defined $_[1]; |
60 | $_[0]->{$attr_name} = $_[1]; |
61 | } |
62 | $_[0]->{$attr_name}; |
63 | }; |
64 | } |
65 | } |
66 | else { |
67 | if ($self->has_weak_ref) { |
68 | return sub { |
69 | if (scalar(@_) == 2) { |
70 | $_[0]->{$attr_name} = $_[1]; |
71 | weaken($_[0]->{$attr_name}); |
72 | } |
73 | $_[0]->{$attr_name}; |
74 | }; |
75 | } |
76 | else { |
77 | sub { |
78 | $_[0]->{$attr_name} = $_[1] if scalar(@_) == 2; |
79 | $_[0]->{$attr_name}; |
80 | }; |
81 | } |
82 | } |
83 | } |
84 | |
85 | sub generate_writer_method { |
86 | my ($self, $attr_name) = @_; |
87 | if ($self->has_type_constraint) { |
88 | if ($self->has_weak_ref) { |
89 | return sub { |
90 | (defined $self->type_constraint->($_[1])) |
5569c072 |
91 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
92 | if defined $_[1]; |
93 | $_[0]->{$attr_name} = $_[1]; |
94 | weaken($_[0]->{$attr_name}); |
95 | }; |
96 | } |
97 | else { |
98 | return sub { |
99 | (defined $self->type_constraint->($_[1])) |
5569c072 |
100 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
101 | if defined $_[1]; |
102 | $_[0]->{$attr_name} = $_[1]; |
103 | }; |
104 | } |
105 | } |
106 | else { |
107 | if ($self->has_weak_ref) { |
108 | return sub { |
109 | $_[0]->{$attr_name} = $_[1]; |
110 | weaken($_[0]->{$attr_name}); |
111 | }; |
112 | } |
113 | else { |
114 | return sub { $_[0]->{$attr_name} = $_[1] }; |
115 | } |
116 | } |
117 | } |
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118 | |
119 | 1; |
120 | |
121 | __END__ |
122 | |
123 | =pod |
124 | |
125 | =head1 NAME |
126 | |
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127 | Moose::Meta::Attribute - The Moose attribute metaobject |
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128 | |
129 | =head1 SYNOPSIS |
130 | |
131 | =head1 DESCRIPTION |
132 | |
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133 | This is a subclass of L<Class::MOP::Attribute> with Moose specific |
134 | extensions. |
135 | |
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136 | =head1 METHODS |
137 | |
138 | =over 4 |
139 | |
140 | =item B<new> |
141 | |
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142 | =item B<generate_accessor_method> |
143 | |
144 | =item B<generate_writer_method> |
145 | |
146 | =back |
147 | |
148 | =over 4 |
149 | |
150 | =item B<has_type_constraint> |
151 | |
152 | =item B<type_constraint> |
153 | |
154 | =item B<has_weak_ref> |
155 | |
156 | =item B<weak_ref> |
157 | |
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158 | =back |
159 | |
160 | =head1 BUGS |
161 | |
162 | All complex software has bugs lurking in it, and this module is no |
163 | exception. If you find a bug please either email me, or add the bug |
164 | to cpan-RT. |
165 | |
c0e30cf5 |
166 | =head1 AUTHOR |
167 | |
168 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
169 | |
170 | =head1 COPYRIGHT AND LICENSE |
171 | |
172 | Copyright 2006 by Infinity Interactive, Inc. |
173 | |
174 | L<http://www.iinteractive.com> |
175 | |
176 | This library is free software; you can redistribute it and/or modify |
177 | it under the same terms as Perl itself. |
178 | |
179 | =cut |