Commit | Line | Data |
d26633fc |
1 | |
2 | package MooseX::AttributeHelpers::Base; |
3 | use Moose; |
8ba40fb0 |
4 | use Moose::Util::TypeConstraints; |
d26633fc |
5 | |
6 | our $VERSION = '0.01'; |
7 | our $AUTHORITY = 'cpan:STEVAN'; |
8 | |
9 | extends 'Moose::Meta::Attribute'; |
10 | |
8e3fab6d |
11 | # this is the method map you define ... |
d26633fc |
12 | has 'provides' => ( |
9810162d |
13 | is => 'ro', |
14 | isa => 'HashRef', |
15 | default => sub {{}} |
d26633fc |
16 | ); |
17 | |
8e3fab6d |
18 | |
19 | # these next two are the possible methods |
20 | # you can use in the 'provides' map. |
21 | |
22 | # provide a Class or Role which we can |
23 | # collect the method providers from |
24 | has 'method_provider' => ( |
25 | is => 'ro', |
26 | isa => 'ClassName', |
27 | predicate => 'has_method_provider', |
28 | ); |
29 | |
30 | # or you can provide a HASH ref of anon subs |
31 | # yourself. This will also collect and store |
32 | # the methods from a method_provider as well |
33 | has 'method_constructors' => ( |
34 | is => 'ro', |
35 | isa => 'HashRef', |
36 | lazy => 1, |
37 | default => sub { |
38 | my $self = shift; |
39 | return +{} unless $self->has_method_provider; |
40 | # or grab them from the role/class |
41 | my $method_provider = $self->method_provider->meta; |
42 | return +{ |
43 | map { |
44 | $_ => $method_provider->get_method($_) |
45 | } $method_provider->get_method_list |
46 | }; |
47 | } |
48 | ); |
49 | |
8881a8d3 |
50 | # extend the parents stuff to make sure |
51 | # certain bits are now required ... |
d26633fc |
52 | has '+$!default' => (required => 1); |
53 | has '+type_constraint' => (required => 1); |
54 | |
8ba40fb0 |
55 | ## Methods called prior to instantiation |
56 | |
57 | sub helper_type { () } |
d26633fc |
58 | |
8ba40fb0 |
59 | sub process_options_for_provides { |
d26633fc |
60 | my ($self, $options) = @_; |
21c7045b |
61 | |
8ba40fb0 |
62 | if (my $type = $self->helper_type) { |
63 | (exists $options->{isa}) |
64 | || confess "You must define a type with the $type metaclass"; |
65 | |
8c651099 |
66 | my $isa = $options->{isa}; |
8ba40fb0 |
67 | |
68 | unless (blessed($isa) && $isa->isa('Moose::Meta::TypeConstraint')) { |
69 | $isa = find_type_constraint($isa); |
70 | } |
71 | |
72 | ($isa->is_a_type_of($type)) |
73 | || confess "The type constraint for a $type ($options->{isa}) must be a subtype of $type"; |
74 | } |
d26633fc |
75 | } |
76 | |
77 | before '_process_options' => sub { |
88aaf2bd |
78 | my ($self, $name, $options) = @_; |
9810162d |
79 | if (exists $options->{provides} || |
80 | exists $options->{isa} && $options->{isa} =~ /^.*?\[.*?\]$/) { |
8ba40fb0 |
81 | $self->process_options_for_provides($options); |
d26633fc |
82 | } |
83 | }; |
84 | |
8ba40fb0 |
85 | ## methods called after instantiation |
86 | |
87 | # this confirms that provides has |
88 | # all valid possibilities in it |
89 | sub check_provides_values { |
90 | my $self = shift; |
8e3fab6d |
91 | |
8ba40fb0 |
92 | my $method_constructors = $self->method_constructors; |
8e3fab6d |
93 | |
8ba40fb0 |
94 | foreach my $key (keys %{$self->provides}) { |
95 | (exists $method_constructors->{$key}) |
96 | || confess "$key is an unsupported method type"; |
97 | } |
98 | } |
99 | |
d26633fc |
100 | after 'install_accessors' => sub { |
101 | my $attr = shift; |
102 | my $class = $attr->associated_class; |
103 | |
88aaf2bd |
104 | # before we install them, lets |
105 | # make sure they are valid |
8ba40fb0 |
106 | $attr->check_provides_values; |
88aaf2bd |
107 | |
d26633fc |
108 | my $method_constructors = $attr->method_constructors; |
109 | |
110 | foreach my $key (keys %{$attr->provides}) { |
8f7951c9 |
111 | |
112 | my $method_name = $attr->provides->{$key}; |
113 | my $method_body = $method_constructors->{$key}->($attr); |
114 | |
115 | if ($class->has_method($method_name)) { |
116 | confess "The method ($method_name) already exists in class (" . $class->name . ")"; |
117 | } |
118 | |
119 | $class->add_method($method_name => |
120 | MooseX::AttributeHelpers::Meta::Method::Provided->wrap( |
121 | $method_body, |
122 | ) |
d26633fc |
123 | ); |
124 | } |
125 | }; |
126 | |
127 | no Moose; |
8ba40fb0 |
128 | no Moose::Util::TypeConstraints; |
d26633fc |
129 | |
130 | 1; |
131 | |
132 | __END__ |
133 | |
134 | =pod |
135 | |
136 | =head1 NAME |
137 | |
138 | MooseX::AttributeHelpers::Base |
139 | |
140 | =head1 SYNOPSIS |
141 | |
142 | =head1 DESCRIPTION |
143 | |
144 | =head1 METHODS |
145 | |
146 | =head1 BUGS |
147 | |
148 | All complex software has bugs lurking in it, and this module is no |
149 | exception. If you find a bug please either email me, or add the bug |
150 | to cpan-RT. |
151 | |
152 | =head1 AUTHOR |
153 | |
154 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
155 | |
156 | =head1 COPYRIGHT AND LICENSE |
157 | |
158 | Copyright 2007 by Infinity Interactive, Inc. |
159 | |
160 | L<http://www.iinteractive.com> |
161 | |
162 | This library is free software; you can redistribute it and/or modify |
163 | it under the same terms as Perl itself. |
164 | |
8a9cea9b |
165 | =cut |