1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
package Moose::Meta::Role::Attribute;
use strict;
use warnings;
use Carp 'confess';
use List::MoreUtils 'all';
use Scalar::Util 'blessed', 'weaken';
our $VERSION = '1.09';
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::Mixin::AttributeCore';
__PACKAGE__->meta->add_attribute(
'metaclass' => (
reader => 'metaclass',
)
);
__PACKAGE__->meta->add_attribute(
'associated_role' => (
reader => 'associated_role',
)
);
__PACKAGE__->meta->add_attribute(
'is' => (
reader => 'is',
)
);
__PACKAGE__->meta->add_attribute(
'original_options' => (
reader => 'original_options',
)
);
sub new {
my ( $class, $name, %options ) = @_;
(defined $name)
|| confess "You must provide a name for the attribute";
return bless {
name => $name,
original_options => \%options,
%options,
}, $class;
}
sub attach_to_role {
my ( $self, $role ) = @_;
( blessed($role) && $role->isa('Moose::Meta::Role') )
|| confess
"You must pass a Moose::Meta::Role instance (or a subclass)";
weaken( $self->{'associated_role'} = $role );
}
sub attribute_for_class {
my $self = shift;
my $metaclass = shift;
return $metaclass->interpolate_class_and_new(
$self->name => %{ $self->original_options } );
}
sub clone {
my $self = shift;
return ( ref $self )->new( $self->name, %{ $self->original_options } );
}
sub is_same_as {
my $self = shift;
my $attr = shift;
my $self_options = $self->original_options;
my $other_options = $attr->original_options;
return 0
unless ( join q{|}, sort keys %{$self_options} ) eq ( join q{|}, sort keys %{$other_options} );
for my $key ( keys %{$self_options} ) {
return 0 if defined $self_options->{$key} && ! defined $other_options->{$key};
return 0 if ! defined $self_options->{$key} && defined $other_options->{$key};
next if all { ! defined } $self_options->{$key}, $other_options->{$key};
return 0 unless $self_options->{$key} eq $other_options->{$key};
}
return 1;
}
1;
=pod
=head1 NAME
Moose::Meta::Role::Attribute - A Moose Attribute metaclass for Roles
=head1 DESCRIPTION
This class implements the API for attributes in roles. Attributes in roles are
more like attribute prototypes than full blown attributes. While they are
introspectable, they have very little behavior.
=head1 METHODS
This class provides the following methods:
=over 4
=item B<< Moose::Meta::Role::Attribute->new(...) >>
This method accepts all the options that would be passed to the constructor
for L<Moose::Meta::Attribute>.
=item B<< $attr->metaclass >>
=item B<< $attr->is >>
Returns the option as passed to the constructor.
=item B<< $attr->associated_role >>
Returns the L<Moose::Meta::Role> to which this attribute belongs, if any.
=item B<< $attr->original_options >>
Returns a hash reference of options passed to the constructor. This is used
when creating a L<Moose::Meta::Attribute> object from this object.
=item B<< $attr->attach_to_role($role) >>
Attaches the attribute to the given L<Moose::Meta::Role>.
=item B<< $attr->attribute_for_class($metaclass) >>
Given an attribute metaclass name, this method calls C<<
$metaclass->interpolate_class_and_new >> to construct an attribute object
which can be added to a L<Moose::Meta::Class>.
=item B<< $attr->clone >>
Creates a new object identical to the object on which the method is called.
=item B<< $attr->is_same_as($other_attr) >>
Compares two role attributes and returns true if they are identical.
=back
In addition, this class implements all informational predicates implements by
L<Moose::Meta::Attribute> (and L<Class::MOP::Attribute>).
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Dave Rolsky E<lt>autarch@urth.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
