Commit | Line | Data |
d245e471 |
1 | package Moo::Role; |
2 | |
3 | use strictures 1; |
4 | use Moo::_Utils; |
7a9263a9 |
5 | use Role::Tiny (); |
d245e471 |
6 | use base qw(Role::Tiny); |
7 | |
a047096b |
8 | require Moo::sification; |
9 | |
d245e471 |
10 | BEGIN { *INFO = \%Role::Tiny::INFO } |
11 | |
12 | our %INFO; |
1e84d6ac |
13 | our %APPLY_DEFAULTS; |
d245e471 |
14 | |
108f8ddc |
15 | sub _install_tracked { |
16 | my ($target, $name, $code) = @_; |
17 | $INFO{$target}{exports}{$name} = $code; |
18 | _install_coderef "${target}::${name}" => "Moo::Role::${name}" => $code; |
19 | } |
20 | |
d245e471 |
21 | sub import { |
22 | my $target = caller; |
6c49212f |
23 | my ($me) = @_; |
d245e471 |
24 | strictures->import; |
1791ba32 |
25 | if ($Moo::MAKERS{$target} and $Moo::MAKERS{$target}{is_class}) { |
26 | die "Cannot import Moo::Role into a Moo class"; |
27 | } |
fa93bfb2 |
28 | $INFO{$target} ||= {}; |
d245e471 |
29 | # get symbol table reference |
30 | my $stash = do { no strict 'refs'; \%{"${target}::"} }; |
108f8ddc |
31 | _install_tracked $target => has => sub { |
1d17c7c1 |
32 | my ($name_proto, %spec) = @_; |
33 | my $name_isref = ref $name_proto eq 'ARRAY'; |
34 | foreach my $name ($name_isref ? @$name_proto : $name_proto) { |
35 | my $spec_ref = $name_isref ? +{%spec} : \%spec; |
36 | ($INFO{$target}{accessor_maker} ||= do { |
37 | require Method::Generate::Accessor; |
38 | Method::Generate::Accessor->new |
39 | })->generate_method($target, $name, $spec_ref); |
40 | push @{$INFO{$target}{attributes}||=[]}, $name, $spec_ref; |
41 | $me->_maybe_reset_handlemoose($target); |
42 | } |
d245e471 |
43 | }; |
6c49212f |
44 | # install before/after/around subs |
45 | foreach my $type (qw(before after around)) { |
108f8ddc |
46 | _install_tracked $target => $type => sub { |
6c49212f |
47 | require Class::Method::Modifiers; |
48 | push @{$INFO{$target}{modifiers}||=[]}, [ $type => @_ ]; |
49 | $me->_maybe_reset_handlemoose($target); |
50 | }; |
51 | } |
108f8ddc |
52 | _install_tracked $target => requires => sub { |
6c49212f |
53 | push @{$INFO{$target}{requires}||=[]}, @_; |
54 | $me->_maybe_reset_handlemoose($target); |
55 | }; |
108f8ddc |
56 | _install_tracked $target => with => sub { |
6c49212f |
57 | $me->apply_roles_to_package($target, @_); |
58 | $me->_maybe_reset_handlemoose($target); |
59 | }; |
fa93bfb2 |
60 | return if $INFO{$target}{is_role}; # already exported into this package |
61 | $INFO{$target}{is_role} = 1; |
62 | *{_getglob("${target}::meta")} = $me->can('meta'); |
6c49212f |
63 | # grab all *non-constant* (stash slot is not a scalarref) subs present |
64 | # in the symbol table and store their refaddrs (no need to forcibly |
65 | # inflate constant subs into real subs) - also add '' to here (this |
66 | # is used later) with a map to the coderefs in case of copying or re-use |
67 | my @not_methods = ('', map { *$_{CODE}||() } grep !ref($_), values %$stash); |
68 | @{$INFO{$target}{not_methods}={}}{@not_methods} = @not_methods; |
69 | # a role does itself |
70 | $Role::Tiny::APPLIED_TO{$target} = { $target => undef }; |
71 | |
7f9775b1 |
72 | if ($INC{'Moo/HandleMoose.pm'}) { |
73 | Moo::HandleMoose::inject_fake_metaclass_for($target); |
74 | } |
6c49212f |
75 | } |
76 | |
fa93bfb2 |
77 | # duplicate from Moo::Object |
78 | sub meta { |
79 | require Moo::HandleMoose::FakeMetaClass; |
80 | my $class = ref($_[0])||$_[0]; |
81 | bless({ name => $class }, 'Moo::HandleMoose::FakeMetaClass'); |
82 | } |
83 | |
108f8ddc |
84 | sub unimport { |
85 | my $target = caller; |
86 | _unimport_coderefs($target, $INFO{$target}); |
87 | } |
88 | |
6c49212f |
89 | sub _maybe_reset_handlemoose { |
90 | my ($class, $target) = @_; |
91 | if ($INC{"Moo/HandleMoose.pm"}) { |
92 | Moo::HandleMoose::maybe_reinject_fake_metaclass_for($target); |
93 | } |
d245e471 |
94 | } |
95 | |
a84066c7 |
96 | sub _inhale_if_moose { |
97 | my ($self, $role) = @_; |
98 | _load_module($role); |
c100c04c |
99 | my $meta; |
100 | if (!$INFO{$role} |
101 | and ( |
102 | $INC{"Moose.pm"} |
103 | and $meta = Class::MOP::class_of($role) |
c316ebe5 |
104 | and $meta->isa('Moose::Meta::Role') |
c100c04c |
105 | ) |
106 | or ( |
96b09f21 |
107 | Mouse::Util->can('find_meta') |
c100c04c |
108 | and $meta = Mouse::Util::find_meta($role) |
c316ebe5 |
109 | and $meta->isa('Mouse::Meta::Role') |
c100c04c |
110 | ) |
111 | ) { |
112 | $INFO{$role}{methods} = { |
113 | map +($_ => $role->can($_)), |
114 | grep !$meta->get_method($_)->isa('Class::MOP::Method::Meta'), |
115 | $meta->get_method_list |
116 | }; |
117 | $Role::Tiny::APPLIED_TO{$role} = { |
118 | map +($_->name => 1), $meta->calculate_all_roles |
119 | }; |
120 | $INFO{$role}{requires} = [ $meta->get_required_method_list ]; |
121 | $INFO{$role}{attributes} = [ |
a668eb67 |
122 | map +($_ => do { |
358c29e1 |
123 | my $attr = $meta->get_attribute($_); |
124 | my $is_mouse = $meta->isa('Mouse::Meta::Role'); |
125 | my $spec = { %{ $is_mouse ? $attr : $attr->original_options } }; |
f96bb37c |
126 | |
a668eb67 |
127 | if ($spec->{isa}) { |
f96bb37c |
128 | |
129 | my $get_constraint = do { |
358c29e1 |
130 | my $pkg = $is_mouse |
f96bb37c |
131 | ? 'Mouse::Util::TypeConstraints' |
132 | : 'Moose::Util::TypeConstraints'; |
133 | _load_module($pkg); |
134 | $pkg->can('find_or_create_isa_type_constraint'); |
135 | }; |
136 | |
137 | my $tc = $get_constraint->($spec->{isa}); |
a668eb67 |
138 | my $check = $tc->_compiled_type_constraint; |
f96bb37c |
139 | |
140 | $spec->{isa} = sub { |
141 | &$check or die "Type constraint failed for $_[0]" |
142 | }; |
143 | |
a668eb67 |
144 | if ($spec->{coerce}) { |
f96bb37c |
145 | |
146 | # Mouse has _compiled_type_coercion straight on the TC object |
147 | $spec->{coerce} = $tc->${\( |
148 | $tc->can('coercion')||sub { $_[0] } |
149 | )}->_compiled_type_coercion; |
a668eb67 |
150 | } |
151 | } |
152 | $spec; |
153 | }), $meta->get_attribute_list |
c100c04c |
154 | ]; |
155 | my $mods = $INFO{$role}{modifiers} = []; |
156 | foreach my $type (qw(before after around)) { |
157 | # Mouse pokes its own internals so we have to fall back to doing |
158 | # the same thing in the absence of the Moose API method |
159 | my $map = $meta->${\( |
160 | $meta->can("get_${type}_method_modifiers_map") |
161 | or sub { shift->{"${type}_method_modifiers"} } |
162 | )}; |
163 | foreach my $method (keys %$map) { |
164 | foreach my $mod (@{$map->{$method}}) { |
165 | push @$mods, [ $type => $method => $mod ]; |
a84066c7 |
166 | } |
167 | } |
a84066c7 |
168 | } |
c100c04c |
169 | require Class::Method::Modifiers if @$mods; |
170 | $INFO{$role}{inhaled_from_moose} = 1; |
a84066c7 |
171 | } |
172 | } |
173 | |
a41e15c3 |
174 | sub _maybe_make_accessors { |
5d4eb6e9 |
175 | my ($self, $target, $role) = @_; |
a41e15c3 |
176 | my $m; |
5d4eb6e9 |
177 | if ($INFO{$role} && $INFO{$role}{inhaled_from_moose} |
e9290d4a |
178 | or $INC{"Moo.pm"} |
179 | and $m = Moo->_accessor_maker_for($target) |
a41e15c3 |
180 | and ref($m) ne 'Method::Generate::Accessor') { |
5d4eb6e9 |
181 | $self->_make_accessors($target, $role); |
a41e15c3 |
182 | } |
183 | } |
184 | |
a84066c7 |
185 | sub _make_accessors_if_moose { |
5d4eb6e9 |
186 | my ($self, $target, $role) = @_; |
187 | if ($INFO{$role} && $INFO{$role}{inhaled_from_moose}) { |
188 | $self->_make_accessors($target, $role); |
a41e15c3 |
189 | } |
190 | } |
191 | |
192 | sub _make_accessors { |
5d4eb6e9 |
193 | my ($self, $target, $role) = @_; |
a41e15c3 |
194 | my $acc_gen = ($Moo::MAKERS{$target}{accessor} ||= do { |
195 | require Method::Generate::Accessor; |
196 | Method::Generate::Accessor->new |
197 | }); |
db10ae2d |
198 | my $con_gen = $Moo::MAKERS{$target}{constructor}; |
a41e15c3 |
199 | my @attrs = @{$INFO{$role}{attributes}||[]}; |
200 | while (my ($name, $spec) = splice @attrs, 0, 2) { |
db10ae2d |
201 | # needed to ensure we got an index for an arrayref based generator |
202 | if ($con_gen) { |
203 | $spec = $con_gen->all_attribute_specs->{$name}; |
204 | } |
a41e15c3 |
205 | $acc_gen->generate_method($target, $name, $spec); |
a84066c7 |
206 | } |
207 | } |
208 | |
4a79464d |
209 | sub apply_roles_to_package { |
210 | my ($me, $to, @roles) = @_; |
141b507a |
211 | foreach my $role (@roles) { |
212 | $me->_inhale_if_moose($role); |
213 | } |
4a79464d |
214 | $me->SUPER::apply_roles_to_package($to, @roles); |
215 | } |
216 | |
6893ea30 |
217 | sub apply_single_role_to_package { |
369a4c50 |
218 | my ($me, $to, $role) = @_; |
a84066c7 |
219 | $me->_inhale_if_moose($role); |
8420a97e |
220 | die "${role} is not a Moo::Role" unless my $info = $INFO{$role}; |
5d4eb6e9 |
221 | $me->_handle_constructor($to, $role); |
222 | $me->_maybe_make_accessors($to, $role); |
a41e15c3 |
223 | $me->SUPER::apply_single_role_to_package($to, $role); |
d245e471 |
224 | } |
225 | |
226 | sub create_class_with_roles { |
227 | my ($me, $superclass, @roles) = @_; |
228 | |
c69190f1 |
229 | my $new_name = join( |
230 | '__WITH__', $superclass, my $compose_name = join '__AND__', @roles |
231 | ); |
232 | |
d245e471 |
233 | return $new_name if $Role::Tiny::COMPOSED{class}{$new_name}; |
234 | |
141b507a |
235 | foreach my $role (@roles) { |
236 | $me->_inhale_if_moose($role); |
237 | } |
a84066c7 |
238 | |
64284a1b |
239 | my $m; |
e9290d4a |
240 | if ($INC{"Moo.pm"} |
241 | and $m = Moo->_accessor_maker_for($superclass) |
64284a1b |
242 | and ref($m) ne 'Method::Generate::Accessor') { |
243 | # old fashioned way time. |
244 | *{_getglob("${new_name}::ISA")} = [ $superclass ]; |
245 | $me->apply_roles_to_package($new_name, @roles); |
246 | return $new_name; |
247 | } |
248 | |
faa9ce11 |
249 | require Sub::Quote; |
d245e471 |
250 | |
251 | $me->SUPER::create_class_with_roles($superclass, @roles); |
252 | |
253 | foreach my $role (@roles) { |
5d4eb6e9 |
254 | die "${role} is not a Role::Tiny" unless $INFO{$role}; |
d245e471 |
255 | } |
256 | |
c69190f1 |
257 | $Moo::MAKERS{$new_name} = {}; |
258 | |
5d4eb6e9 |
259 | $me->_handle_constructor($new_name, $_) for @roles; |
d245e471 |
260 | |
261 | return $new_name; |
262 | } |
263 | |
fe0d87fb |
264 | sub apply_roles_to_object { |
265 | my ($me, $object, @roles) = @_; |
266 | my $new = $me->SUPER::apply_roles_to_object($object, @roles); |
fe0d87fb |
267 | |
1e84d6ac |
268 | my $apply_defaults = $APPLY_DEFAULTS{ref $new} ||= do { |
fe0d87fb |
269 | my %attrs = map { @{$INFO{$_}{attributes}||[]} } @roles; |
270 | |
1e84d6ac |
271 | if ($INC{'Moo.pm'} |
272 | and keys %attrs |
273 | and my $con_gen = Moo->_constructor_maker_for(ref $new) |
274 | and my $m = Moo->_accessor_maker_for(ref $new)) { |
275 | require Sub::Quote; |
276 | |
277 | my $specs = $con_gen->all_attribute_specs; |
278 | |
279 | my $assign = ''; |
280 | my %captures; |
281 | foreach my $name ( keys %attrs ) { |
282 | my $spec = $specs->{$name}; |
283 | if ($m->has_eager_default($name, $spec)) { |
284 | my ($has, $has_cap) |
285 | = $m->generate_simple_has('$_[0]', $name, $spec); |
286 | my ($code, $pop_cap) |
287 | = $m->generate_use_default('$_[0]', $name, $spec, $has); |
288 | |
289 | $assign .= $code; |
290 | @captures{keys %$has_cap, keys %$pop_cap} |
291 | = (values %$has_cap, values %$pop_cap); |
292 | } |
fe0d87fb |
293 | } |
1e84d6ac |
294 | Sub::Quote::quote_sub($assign, \%captures); |
fe0d87fb |
295 | } |
1e84d6ac |
296 | else { |
297 | sub {}; |
298 | } |
299 | }; |
300 | $new->$apply_defaults; |
fe0d87fb |
301 | return $new; |
302 | } |
303 | |
a84066c7 |
304 | sub _composable_package_for { |
305 | my ($self, $role) = @_; |
306 | my $composed_name = 'Role::Tiny::_COMPOSABLE::'.$role; |
307 | return $composed_name if $Role::Tiny::COMPOSED{role}{$composed_name}; |
5d4eb6e9 |
308 | $self->_make_accessors_if_moose($composed_name, $role); |
a84066c7 |
309 | $self->SUPER::_composable_package_for($role); |
310 | } |
311 | |
dccea57d |
312 | sub _install_single_modifier { |
313 | my ($me, @args) = @_; |
314 | _install_modifier(@args); |
d245e471 |
315 | } |
316 | |
317 | sub _handle_constructor { |
5d4eb6e9 |
318 | my ($me, $to, $role) = @_; |
319 | my $attr_info = $INFO{$role} && $INFO{$role}{attributes}; |
57d402ef |
320 | return unless $attr_info && @$attr_info; |
d245e471 |
321 | if ($INFO{$to}) { |
57d402ef |
322 | push @{$INFO{$to}{attributes}||=[]}, @$attr_info; |
d245e471 |
323 | } else { |
324 | # only fiddle with the constructor if the target is a Moo class |
325 | if ($INC{"Moo.pm"} |
8dee08c1 |
326 | and my $con = Moo->_constructor_maker_for($to)) { |
a41e15c3 |
327 | # shallow copy of the specs since the constructor will assign an index |
57d402ef |
328 | $con->register_attribute_specs(map ref() ? { %$_ } : $_, @$attr_info); |
d245e471 |
329 | } |
330 | } |
331 | } |
332 | |
333 | 1; |
bce933ec |
334 | |
0b6e5fff |
335 | =head1 NAME |
336 | |
337 | Moo::Role - Minimal Object Orientation support for Roles |
bce933ec |
338 | |
339 | =head1 SYNOPSIS |
340 | |
341 | package My::Role; |
342 | |
343 | use Moo::Role; |
344 | |
345 | sub foo { ... } |
346 | |
347 | sub bar { ... } |
348 | |
349 | has baz => ( |
350 | is => 'ro', |
351 | ); |
352 | |
353 | 1; |
354 | |
52e8f144 |
355 | And elsewhere: |
bce933ec |
356 | |
357 | package Some::Class; |
358 | |
359 | use Moo; |
360 | |
361 | # bar gets imported, but not foo |
362 | with('My::Role'); |
363 | |
364 | sub foo { ... } |
365 | |
366 | 1; |
367 | |
368 | =head1 DESCRIPTION |
369 | |
370 | C<Moo::Role> builds upon L<Role::Tiny>, so look there for most of the |
371 | documentation on how this works. The main addition here is extra bits to make |
372 | the roles more "Moosey;" which is to say, it adds L</has>. |
373 | |
374 | =head1 IMPORTED SUBROUTINES |
375 | |
376 | See L<Role::Tiny/IMPORTED SUBROUTINES> for all the other subroutines that are |
377 | imported by this module. |
378 | |
379 | =head2 has |
380 | |
381 | has attr => ( |
382 | is => 'ro', |
383 | ); |
384 | |
385 | Declares an attribute for the class to be composed into. See |
386 | L<Moo/has> for all options. |
40f3e3aa |
387 | |
072d158f |
388 | =head1 SUPPORT |
389 | |
1108b2e2 |
390 | See L<Moo> for support and contact information. |
072d158f |
391 | |
40f3e3aa |
392 | =head1 AUTHORS |
393 | |
394 | See L<Moo> for authors. |
395 | |
396 | =head1 COPYRIGHT AND LICENSE |
397 | |
398 | See L<Moo> for the copyright and license. |