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( |
4b598ea3 |
17 | Class::MOP::Attribute->new('coerce' => ( |
18 | reader => 'coerce', |
19 | predicate => 'has_coercion' |
20 | )) |
21 | ); |
22 | |
23 | Moose::Meta::Attribute->meta->add_attribute( |
a15dff8d |
24 | Class::MOP::Attribute->new('weak_ref' => ( |
25 | reader => 'weak_ref', |
26 | predicate => { |
27 | 'has_weak_ref' => sub { $_[0]->weak_ref() ? 1 : 0 } |
28 | } |
29 | )) |
30 | ); |
31 | |
32 | Moose::Meta::Attribute->meta->add_attribute( |
33 | Class::MOP::Attribute->new('type_constraint' => ( |
34 | reader => 'type_constraint', |
35 | predicate => 'has_type_constraint', |
36 | )) |
37 | ); |
38 | |
39 | Moose::Meta::Attribute->meta->add_before_method_modifier('new' => sub { |
40 | my (undef, undef, %options) = @_; |
4b598ea3 |
41 | if (exists $options{coerce} && $options{coerce}) { |
42 | (exists $options{type_constraint}) |
43 | || confess "You cannot have coercion without specifying a type constraint"; |
44 | confess "You cannot have a weak reference to a coerced value" |
45 | if $options{weak_ref}; |
46 | } |
a15dff8d |
47 | (reftype($options{type_constraint}) && reftype($options{type_constraint}) eq 'CODE') |
29db16a9 |
48 | || confess "Type cosntraint parameter must be a code-ref, not " . $options{type_constraint} |
49 | if exists $options{type_constraint}; |
c0e30cf5 |
50 | }); |
51 | |
a15dff8d |
52 | sub generate_accessor_method { |
53 | my ($self, $attr_name) = @_; |
54 | if ($self->has_type_constraint) { |
55 | if ($self->has_weak_ref) { |
56 | return sub { |
57 | if (scalar(@_) == 2) { |
58 | (defined $self->type_constraint->($_[1])) |
5569c072 |
59 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
60 | if defined $_[1]; |
61 | $_[0]->{$attr_name} = $_[1]; |
62 | weaken($_[0]->{$attr_name}); |
63 | } |
64 | $_[0]->{$attr_name}; |
65 | }; |
66 | } |
67 | else { |
4b598ea3 |
68 | if ($self->has_coercion) { |
69 | return sub { |
70 | if (scalar(@_) == 2) { |
71 | my $val = $self->coerce->($_[1]); |
72 | (defined $self->type_constraint->($val)) |
73 | || confess "Attribute ($attr_name) does not pass the type contraint with '$val'" |
74 | if defined $val; |
75 | $_[0]->{$attr_name} = $val; |
76 | } |
77 | $_[0]->{$attr_name}; |
78 | }; |
79 | } |
80 | else { |
81 | return sub { |
82 | if (scalar(@_) == 2) { |
83 | (defined $self->type_constraint->($_[1])) |
84 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
85 | if defined $_[1]; |
86 | $_[0]->{$attr_name} = $_[1]; |
87 | } |
88 | $_[0]->{$attr_name}; |
89 | }; |
90 | } |
a15dff8d |
91 | } |
92 | } |
93 | else { |
94 | if ($self->has_weak_ref) { |
95 | return sub { |
96 | if (scalar(@_) == 2) { |
97 | $_[0]->{$attr_name} = $_[1]; |
98 | weaken($_[0]->{$attr_name}); |
99 | } |
100 | $_[0]->{$attr_name}; |
101 | }; |
102 | } |
103 | else { |
104 | sub { |
105 | $_[0]->{$attr_name} = $_[1] if scalar(@_) == 2; |
106 | $_[0]->{$attr_name}; |
107 | }; |
108 | } |
109 | } |
110 | } |
111 | |
112 | sub generate_writer_method { |
113 | my ($self, $attr_name) = @_; |
114 | if ($self->has_type_constraint) { |
115 | if ($self->has_weak_ref) { |
116 | return sub { |
117 | (defined $self->type_constraint->($_[1])) |
5569c072 |
118 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
119 | if defined $_[1]; |
120 | $_[0]->{$attr_name} = $_[1]; |
121 | weaken($_[0]->{$attr_name}); |
122 | }; |
123 | } |
124 | else { |
125 | return sub { |
126 | (defined $self->type_constraint->($_[1])) |
5569c072 |
127 | || confess "Attribute ($attr_name) does not pass the type contraint with '$_[1]'" |
a15dff8d |
128 | if defined $_[1]; |
129 | $_[0]->{$attr_name} = $_[1]; |
130 | }; |
131 | } |
132 | } |
133 | else { |
134 | if ($self->has_weak_ref) { |
135 | return sub { |
136 | $_[0]->{$attr_name} = $_[1]; |
137 | weaken($_[0]->{$attr_name}); |
138 | }; |
139 | } |
140 | else { |
141 | return sub { $_[0]->{$attr_name} = $_[1] }; |
142 | } |
143 | } |
144 | } |
c0e30cf5 |
145 | |
146 | 1; |
147 | |
148 | __END__ |
149 | |
150 | =pod |
151 | |
152 | =head1 NAME |
153 | |
e522431d |
154 | Moose::Meta::Attribute - The Moose attribute metaobject |
c0e30cf5 |
155 | |
156 | =head1 SYNOPSIS |
157 | |
158 | =head1 DESCRIPTION |
159 | |
e522431d |
160 | This is a subclass of L<Class::MOP::Attribute> with Moose specific |
161 | extensions. |
162 | |
c0e30cf5 |
163 | =head1 METHODS |
164 | |
165 | =over 4 |
166 | |
167 | =item B<new> |
168 | |
a15dff8d |
169 | =item B<generate_accessor_method> |
170 | |
171 | =item B<generate_writer_method> |
172 | |
173 | =back |
174 | |
175 | =over 4 |
176 | |
177 | =item B<has_type_constraint> |
178 | |
179 | =item B<type_constraint> |
180 | |
181 | =item B<has_weak_ref> |
182 | |
183 | =item B<weak_ref> |
184 | |
4b598ea3 |
185 | =item B<coerce> |
186 | |
187 | =item B<has_coercion> |
188 | |
c0e30cf5 |
189 | =back |
190 | |
191 | =head1 BUGS |
192 | |
193 | All complex software has bugs lurking in it, and this module is no |
194 | exception. If you find a bug please either email me, or add the bug |
195 | to cpan-RT. |
196 | |
c0e30cf5 |
197 | =head1 AUTHOR |
198 | |
199 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
200 | |
201 | =head1 COPYRIGHT AND LICENSE |
202 | |
203 | Copyright 2006 by Infinity Interactive, Inc. |
204 | |
205 | L<http://www.iinteractive.com> |
206 | |
207 | This library is free software; you can redistribute it and/or modify |
208 | it under the same terms as Perl itself. |
209 | |
210 | =cut |