Commit | Line | Data |
e185c027 |
1 | |
2 | package Moose::Role; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
e65dccbc |
7 | use Scalar::Util 'blessed'; |
cc5e6b6f |
8 | use Carp 'confess', 'croak'; |
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9 | |
c4538447 |
10 | use Data::OptList; |
2d562421 |
11 | use Sub::Exporter; |
12 | |
a94188ac |
13 | our $VERSION = '0.56'; |
d44714be |
14 | our $AUTHORITY = 'cpan:STEVAN'; |
e185c027 |
15 | |
d7d8a8c7 |
16 | use Moose (); |
17 | use Moose::Util (); |
e65dccbc |
18 | |
e185c027 |
19 | use Moose::Meta::Role; |
7eaef7ad |
20 | use Moose::Util::TypeConstraints; |
e185c027 |
21 | |
5bd4db9b |
22 | sub extends { |
23 | croak "Roles do not currently support 'extends'"; |
24 | } |
fb1e11d5 |
25 | |
5bd4db9b |
26 | sub with { |
27 | Moose::Util::apply_all_roles( shift->meta(), @_ ); |
28 | } |
2d562421 |
29 | |
5bd4db9b |
30 | sub requires { |
31 | my $meta = shift->meta(); |
32 | croak "Must specify at least one method" unless @_; |
33 | $meta->add_required_methods(@_); |
34 | } |
fb1e11d5 |
35 | |
5bd4db9b |
36 | sub excludes { |
37 | my $meta = shift->meta(); |
38 | croak "Must specify at least one role" unless @_; |
39 | $meta->add_excluded_roles(@_); |
40 | } |
fc9a40d7 |
41 | |
5bd4db9b |
42 | sub has { |
43 | my $meta = shift->meta(); |
44 | my $name = shift; |
45 | croak 'Usage: has \'name\' => ( key => value, ... )' if @_ == 1; |
46 | my %options = @_; |
47 | my $attrs = ( ref($name) eq 'ARRAY' ) ? $name : [ ($name) ]; |
48 | $meta->add_attribute( $_, %options ) for @$attrs; |
49 | } |
fb1e11d5 |
50 | |
5bd4db9b |
51 | sub before { |
52 | my $meta = shift->meta(); |
53 | my $code = pop @_; |
2d562421 |
54 | |
5bd4db9b |
55 | for (@_) { |
56 | croak "Moose::Role do not currently support " |
57 | . ref($_) |
58 | . " references for before method modifiers" |
59 | if ref $_; |
60 | $meta->add_before_method_modifier( $_, $code ); |
61 | } |
62 | } |
63 | |
64 | sub after { |
65 | my $meta = shift->meta(); |
66 | |
67 | my $code = pop @_; |
68 | for (@_) { |
69 | croak "Moose::Role do not currently support " |
70 | . ref($_) |
71 | . " references for after method modifiers" |
72 | if ref $_; |
73 | $meta->add_after_method_modifier( $_, $code ); |
74 | } |
75 | } |
2d562421 |
76 | |
5bd4db9b |
77 | sub around { |
78 | my $meta = shift->meta(); |
79 | my $code = pop @_; |
80 | for (@_) { |
81 | croak "Moose::Role do not currently support " |
82 | . ref($_) |
83 | . " references for around method modifiers" |
84 | if ref $_; |
85 | $meta->add_around_method_modifier( $_, $code ); |
86 | } |
87 | } |
2d562421 |
88 | |
5bd4db9b |
89 | # see Moose.pm for discussion |
90 | sub super { |
91 | return unless $Moose::SUPER_BODY; |
92 | $Moose::SUPER_BODY->(@Moose::SUPER_ARGS); |
93 | } |
d31f9614 |
94 | |
5bd4db9b |
95 | sub override { |
96 | my $meta = shift->meta(); |
97 | my ( $name, $code ) = @_; |
98 | $meta->add_override_method_modifier( $name, $code ); |
99 | } |
d31f9614 |
100 | |
5bd4db9b |
101 | sub inner { |
102 | croak "Moose::Role cannot support 'inner'"; |
103 | } |
d31f9614 |
104 | |
5bd4db9b |
105 | sub augment { |
106 | croak "Moose::Role cannot support 'augment'"; |
107 | } |
d31f9614 |
108 | |
a5c426fc |
109 | my $exporter = Moose::Exporter->build_import_methods( |
5bd4db9b |
110 | with_caller => [ |
111 | qw( with requires excludes has before after around override make_immutable ) |
112 | ], |
113 | as_is => [ |
114 | qw( extends super inner augment ), |
115 | \&Carp::confess, |
116 | \&Scalar::Util::blessed, |
117 | ], |
118 | ); |
119 | |
cbb03d24 |
120 | { |
121 | my %METAS; |
122 | |
0338a411 |
123 | sub _init_meta { |
124 | shift; |
125 | my %args = @_; |
126 | |
127 | my $role = $args{for_class} |
128 | or confess |
129 | "Cannot call _init_meta without specifying a for_class"; |
cbb03d24 |
130 | |
131 | return $METAS{$role} if exists $METAS{$role}; |
132 | |
133 | # make a subtype for each Moose class |
134 | role_type $role unless find_type_constraint($role); |
135 | |
136 | my $meta; |
137 | if ($role->can('meta')) { |
138 | $meta = $role->meta(); |
139 | (blessed($meta) && $meta->isa('Moose::Meta::Role')) |
140 | || confess "You already have a &meta function, but it does not return a Moose::Meta::Role"; |
141 | } |
142 | else { |
143 | $meta = Moose::Meta::Role->initialize($role); |
144 | $meta->alias_method('meta' => sub { $meta }); |
145 | } |
146 | |
147 | return $METAS{$role} = $meta; |
148 | } |
149 | } |
150 | |
e185c027 |
151 | 1; |
152 | |
153 | __END__ |
154 | |
155 | =pod |
156 | |
157 | =head1 NAME |
158 | |
159 | Moose::Role - The Moose Role |
160 | |
76d37e5a |
161 | =head1 SYNOPSIS |
162 | |
163 | package Eq; |
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164 | use Moose::Role; # automatically turns on strict and warnings |
fb1e11d5 |
165 | |
e46edf94 |
166 | requires 'equal'; |
fb1e11d5 |
167 | |
168 | sub no_equal { |
76d37e5a |
169 | my ($self, $other) = @_; |
170 | !$self->equal($other); |
171 | } |
fb1e11d5 |
172 | |
76d37e5a |
173 | # ... then in your classes |
fb1e11d5 |
174 | |
76d37e5a |
175 | package Currency; |
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176 | use Moose; # automatically turns on strict and warnings |
fb1e11d5 |
177 | |
76d37e5a |
178 | with 'Eq'; |
fb1e11d5 |
179 | |
76d37e5a |
180 | sub equal { |
181 | my ($self, $other) = @_; |
bdabd620 |
182 | $self->as_float == $other->as_float; |
76d37e5a |
183 | } |
184 | |
e185c027 |
185 | =head1 DESCRIPTION |
186 | |
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187 | Role support in Moose is pretty solid at this point. However, the best |
188 | documentation is still the the test suite. It is fairly safe to assume Perl 6 |
189 | style behavior and then either refer to the test suite, or ask questions on |
190 | #moose if something doesn't quite do what you expect. |
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191 | |
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192 | We are planning writing some more documentation in the near future, but nothing |
193 | is ready yet, sorry. |
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194 | |
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195 | =head1 EXPORTED FUNCTIONS |
196 | |
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197 | Moose::Role currently supports all of the functions that L<Moose> exports, but |
198 | differs slightly in how some items are handled (see L<CAVEATS> below for |
199 | details). |
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200 | |
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201 | Moose::Role also offers two role-specific keyword exports: |
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202 | |
203 | =over 4 |
204 | |
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205 | =item B<requires (@method_names)> |
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206 | |
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207 | Roles can require that certain methods are implemented by any class which |
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208 | C<does> the role. |
9e93dd19 |
209 | |
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210 | =item B<excludes (@role_names)> |
211 | |
9e93dd19 |
212 | Roles can C<exclude> other roles, in effect saying "I can never be combined |
fb1e11d5 |
213 | with these C<@role_names>". This is a feature which should not be used |
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214 | lightly. |
9e93dd19 |
215 | |
2c0cbef7 |
216 | =back |
217 | |
d31f9614 |
218 | =head2 B<unimport> |
219 | |
220 | Moose::Role offers a way to remove the keywords it exports, through the |
221 | C<unimport> method. You simply have to say C<no Moose::Role> at the bottom of |
222 | your code for this to work. |
223 | |
2c0cbef7 |
224 | =head1 CAVEATS |
225 | |
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226 | Role support has only a few caveats: |
2c0cbef7 |
227 | |
228 | =over 4 |
76d37e5a |
229 | |
76d37e5a |
230 | =item * |
231 | |
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232 | Roles cannot use the C<extends> keyword; it will throw an exception for now. |
233 | The same is true of the C<augment> and C<inner> keywords (not sure those |
234 | really make sense for roles). All other Moose keywords will be I<deferred> |
85424612 |
235 | so that they can be applied to the consuming class. |
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236 | |
fb1e11d5 |
237 | =item * |
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238 | |
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239 | Role composition does its best to B<not> be order-sensitive when it comes to |
240 | conflict resolution and requirements detection. However, it is order-sensitive |
241 | when it comes to method modifiers. All before/around/after modifiers are |
242 | included whenever a role is composed into a class, and then applied in the order |
243 | in which the roles are used. This also means that there is no conflict for |
244 | before/around/after modifiers. |
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245 | |
85424612 |
246 | In most cases, this will be a non-issue; however, it is something to keep in |
247 | mind when using method modifiers in a role. You should never assume any |
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248 | ordering. |
249 | |
250 | =item * |
251 | |
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252 | The C<requires> keyword currently only works with actual methods. A method |
253 | modifier (before/around/after and override) will not count as a fufillment |
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254 | of the requirement, and neither will an autogenerated accessor for an attribute. |
255 | |
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256 | It is likely that attribute accessors will eventually be allowed to fufill those |
257 | requirements, or we will introduce a C<requires_attr> keyword of some kind |
258 | instead. This decision has not yet been finalized. |
2c0cbef7 |
259 | |
e185c027 |
260 | =back |
261 | |
262 | =head1 BUGS |
263 | |
fb1e11d5 |
264 | All complex software has bugs lurking in it, and this module is no |
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265 | exception. If you find a bug please either email me, or add the bug |
266 | to cpan-RT. |
267 | |
268 | =head1 AUTHOR |
269 | |
270 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
271 | |
db1ab48d |
272 | Christian Hansen E<lt>chansen@cpan.orgE<gt> |
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273 | |
e185c027 |
274 | =head1 COPYRIGHT AND LICENSE |
275 | |
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276 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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277 | |
278 | L<http://www.iinteractive.com> |
279 | |
280 | This library is free software; you can redistribute it and/or modify |
fb1e11d5 |
281 | it under the same terms as Perl itself. |
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282 | |
68117c45 |
283 | =cut |