Commit | Line | Data |
e606ae5f |
1 | package Moose::Exporter; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6d0815b5 |
6 | our $VERSION = '0.93'; |
ae18d5ec |
7 | $VERSION = eval $VERSION; |
8 | our $AUTHORITY = 'cpan:STEVAN'; |
9 | |
e606ae5f |
10 | use Class::MOP; |
11 | use List::MoreUtils qw( first_index uniq ); |
12 | use Moose::Util::MetaRole; |
091ac4b7 |
13 | use Sub::Exporter 0.980; |
9f2230e9 |
14 | use Sub::Name qw(subname); |
e606ae5f |
15 | |
16 | my %EXPORT_SPEC; |
17 | |
18 | sub setup_import_methods { |
19 | my ( $class, %args ) = @_; |
20 | |
21 | my $exporting_package = $args{exporting_package} ||= caller(); |
22 | |
95056a1e |
23 | $class->build_import_methods( |
24 | %args, |
25 | install => [qw(import unimport init_meta)] |
26 | ); |
e606ae5f |
27 | } |
28 | |
29 | sub build_import_methods { |
30 | my ( $class, %args ) = @_; |
31 | |
32 | my $exporting_package = $args{exporting_package} ||= caller(); |
33 | |
34 | $EXPORT_SPEC{$exporting_package} = \%args; |
35 | |
36 | my @exports_from = $class->_follow_also( $exporting_package ); |
37 | |
38 | my $export_recorder = {}; |
39 | |
e0d3eb10 |
40 | my $exports = $class->_make_sub_exporter_params( |
41 | [ @exports_from, $exporting_package ], $export_recorder, |
42 | ); |
e606ae5f |
43 | |
44 | my $exporter = Sub::Exporter::build_exporter( |
45 | { |
46 | exports => $exports, |
0661fc1a |
47 | groups => { default => [':all'] } |
e606ae5f |
48 | } |
49 | ); |
50 | |
95056a1e |
51 | my %methods; |
95056a1e |
52 | $methods{import} = $class->_make_import_sub( $exporting_package, |
05cde4e8 |
53 | $exporter, \@exports_from ); |
e606ae5f |
54 | |
95056a1e |
55 | $methods{unimport} = $class->_make_unimport_sub( $exporting_package, |
e0d3eb10 |
56 | $exports, $export_recorder ); |
95056a1e |
57 | |
58 | $methods{init_meta} = $class->_make_init_meta( $exporting_package, |
59 | \%args ); |
60 | |
61 | my $package = Class::MOP::Package->initialize($exporting_package); |
906eabcd |
62 | for my $to_install ( @{ $args{install} || [] } ) { |
95056a1e |
63 | my $symbol = '&' . $to_install; |
906eabcd |
64 | next |
65 | unless $methods{$to_install} |
66 | && !$package->has_package_symbol($symbol); |
67 | $package->add_package_symbol( $symbol, $methods{$to_install} ); |
95056a1e |
68 | } |
e606ae5f |
69 | |
95056a1e |
70 | return ( $methods{import}, $methods{unimport}, $methods{init_meta} ) |
e606ae5f |
71 | } |
72 | |
73 | { |
74 | my $seen = {}; |
75 | |
76 | sub _follow_also { |
77 | my $class = shift; |
78 | my $exporting_package = shift; |
79 | |
80 | local %$seen = ( $exporting_package => 1 ); |
81 | |
82 | return uniq( _follow_also_real($exporting_package) ); |
83 | } |
84 | |
85 | sub _follow_also_real { |
86 | my $exporting_package = shift; |
87 | |
ba1a3c2f |
88 | if (!exists $EXPORT_SPEC{$exporting_package}) { |
89 | my $loaded = Class::MOP::is_class_loaded($exporting_package); |
90 | |
91 | die "Package in also ($exporting_package) does not seem to " |
92 | . "use Moose::Exporter" |
93 | . ($loaded ? "" : " (is it loaded?)"); |
94 | } |
e606ae5f |
95 | |
96 | my $also = $EXPORT_SPEC{$exporting_package}{also}; |
97 | |
98 | return unless defined $also; |
99 | |
100 | my @also = ref $also ? @{$also} : $also; |
101 | |
102 | for my $package (@also) |
103 | { |
b822369d |
104 | die "Circular reference in 'also' parameter to Moose::Exporter between $exporting_package and $package" |
e606ae5f |
105 | if $seen->{$package}; |
106 | |
107 | $seen->{$package} = 1; |
108 | } |
109 | |
110 | return @also, map { _follow_also_real($_) } @also; |
111 | } |
112 | } |
113 | |
114 | sub _make_sub_exporter_params { |
115 | my $class = shift; |
116 | my $packages = shift; |
117 | my $export_recorder = shift; |
118 | |
119 | my %exports; |
120 | |
121 | for my $package ( @{$packages} ) { |
122 | my $args = $EXPORT_SPEC{$package} |
123 | or die "The $package package does not use Moose::Exporter\n"; |
124 | |
5ac14e89 |
125 | for my $name ( @{ $args->{with_meta} } ) { |
0dd4228e |
126 | my $sub = $class->_sub_from_package( $package, $name ) |
127 | or next; |
e6a5040f |
128 | |
e606ae5f |
129 | my $fq_name = $package . '::' . $name; |
130 | |
5ac14e89 |
131 | $exports{$name} = $class->_make_wrapped_sub_with_meta( |
e606ae5f |
132 | $fq_name, |
133 | $sub, |
134 | $export_recorder, |
135 | ); |
136 | } |
137 | |
5ac14e89 |
138 | for my $name ( @{ $args->{with_caller} } ) { |
0dd4228e |
139 | my $sub = $class->_sub_from_package( $package, $name ) |
140 | or next; |
e6a5040f |
141 | |
45975bce |
142 | my $fq_name = $package . '::' . $name; |
143 | |
5ac14e89 |
144 | $exports{$name} = $class->_make_wrapped_sub( |
45975bce |
145 | $fq_name, |
146 | $sub, |
147 | $export_recorder, |
148 | ); |
45975bce |
149 | } |
150 | |
e606ae5f |
151 | for my $name ( @{ $args->{as_is} } ) { |
e6a5040f |
152 | my ($sub, $coderef_name); |
e606ae5f |
153 | |
154 | if ( ref $name ) { |
e0d3eb10 |
155 | $sub = $name; |
e05fb8ae |
156 | |
e05fb8ae |
157 | my $coderef_pkg; |
e6a5040f |
158 | ( $coderef_pkg, $coderef_name ) |
159 | = Class::MOP::get_code_info($name); |
e05fb8ae |
160 | |
e0d3eb10 |
161 | # Moose re-exports things from Carp and Scalar::Util. Usually, |
162 | # we want to remove those again at unimport time. However, the |
163 | # importing package might have imported those symbols |
164 | # explicitly after using Moose ala |
165 | # |
166 | # use Moose; |
167 | # use Carp qw( confess ); |
168 | # |
169 | # In this case, we don't want to remove 'confess' when |
170 | # unimporting. To do that, we wrap the exports from other |
171 | # packages in anonymous coderef. Then, at unimport time, we |
172 | # can figure out if the package symbol still contains the |
173 | # coderef we exported, or if the user overwrote it with |
174 | # something else we don't want to remove. |
175 | if ( $coderef_pkg ne $package ) { |
176 | $sub = sub { goto &$name }; |
177 | &Scalar::Util::set_prototype( $sub, prototype $name ); |
178 | } |
e606ae5f |
179 | } |
180 | else { |
0dd4228e |
181 | $sub = $class->_sub_from_package( $package, $name ) |
182 | or next; |
e6a5040f |
183 | |
e6a5040f |
184 | $coderef_name = $name; |
e606ae5f |
185 | } |
186 | |
187 | $export_recorder->{$sub} = 1; |
188 | |
e0d3eb10 |
189 | $exports{$coderef_name} = sub { $sub }; |
e606ae5f |
190 | } |
191 | } |
192 | |
e0d3eb10 |
193 | return \%exports; |
e606ae5f |
194 | } |
195 | |
0dd4228e |
196 | sub _sub_from_package { |
197 | my $sclass = shift; |
198 | my $package = shift; |
199 | my $name = shift; |
200 | |
201 | my $sub = do { |
202 | no strict 'refs'; |
203 | \&{ $package . '::' . $name }; |
204 | }; |
205 | |
206 | return $sub if defined &$sub; |
207 | |
208 | Carp::cluck |
209 | "Trying to export undefined sub ${package}::${name}"; |
210 | |
211 | return; |
212 | } |
213 | |
96bb13ea |
214 | our $CALLER; |
215 | |
216 | sub _make_wrapped_sub { |
b4f00a34 |
217 | my $self = shift; |
96bb13ea |
218 | my $fq_name = shift; |
219 | my $sub = shift; |
220 | my $export_recorder = shift; |
221 | |
222 | # We need to set the package at import time, so that when |
223 | # package Foo imports has(), we capture "Foo" as the |
224 | # package. This lets other packages call Foo::has() and get |
225 | # the right package. This is done for backwards compatibility |
226 | # with existing production code, not because this is a good |
227 | # idea ;) |
228 | return sub { |
229 | my $caller = $CALLER; |
230 | |
6de00734 |
231 | my $wrapper = $self->_curry_wrapper($sub, $fq_name, $caller); |
b4f00a34 |
232 | |
9f2230e9 |
233 | my $sub = subname($fq_name => $wrapper); |
96bb13ea |
234 | |
235 | $export_recorder->{$sub} = 1; |
236 | |
237 | return $sub; |
238 | }; |
239 | } |
e606ae5f |
240 | |
45975bce |
241 | sub _make_wrapped_sub_with_meta { |
242 | my $self = shift; |
243 | my $fq_name = shift; |
244 | my $sub = shift; |
245 | my $export_recorder = shift; |
246 | |
247 | return sub { |
248 | my $caller = $CALLER; |
249 | |
250 | my $wrapper = $self->_late_curry_wrapper($sub, $fq_name, |
251 | sub { Class::MOP::class_of(shift) } => $caller); |
252 | |
253 | my $sub = subname($fq_name => $wrapper); |
254 | |
255 | $export_recorder->{$sub} = 1; |
256 | |
257 | return $sub; |
258 | }; |
259 | } |
260 | |
6de00734 |
261 | sub _curry_wrapper { |
badbc528 |
262 | my $class = shift; |
b4f00a34 |
263 | my $sub = shift; |
264 | my $fq_name = shift; |
6de00734 |
265 | my @extra = @_; |
b4f00a34 |
266 | |
6de00734 |
267 | my $wrapper = sub { $sub->(@extra, @_) }; |
badbc528 |
268 | if (my $proto = prototype $sub) { |
2d7e979b |
269 | # XXX - Perl's prototype sucks. Use & to make set_prototype |
6de00734 |
270 | # ignore the fact that we're passing "private variables" |
2d7e979b |
271 | &Scalar::Util::set_prototype($wrapper, $proto); |
badbc528 |
272 | } |
273 | return $wrapper; |
b4f00a34 |
274 | } |
275 | |
45975bce |
276 | sub _late_curry_wrapper { |
277 | my $class = shift; |
278 | my $sub = shift; |
279 | my $fq_name = shift; |
280 | my $extra = shift; |
281 | my @ex_args = @_; |
282 | |
283 | my $wrapper = sub { |
284 | # resolve curried arguments at runtime via this closure |
285 | my @curry = ( $extra->( @ex_args ) ); |
286 | return $sub->(@curry, @_); |
287 | }; |
288 | |
289 | if (my $proto = prototype $sub) { |
290 | # XXX - Perl's prototype sucks. Use & to make set_prototype |
291 | # ignore the fact that we're passing "private variables" |
292 | &Scalar::Util::set_prototype($wrapper, $proto); |
293 | } |
294 | return $wrapper; |
295 | } |
296 | |
96bb13ea |
297 | sub _make_import_sub { |
298 | shift; |
299 | my $exporting_package = shift; |
300 | my $exporter = shift; |
301 | my $exports_from = shift; |
96bb13ea |
302 | |
303 | return sub { |
304 | |
305 | # I think we could use Sub::Exporter's collector feature |
306 | # to do this, but that would be rather gross, since that |
307 | # feature isn't really designed to return a value to the |
308 | # caller of the exporter sub. |
309 | # |
310 | # Also, this makes sure we preserve backwards compat for |
311 | # _get_caller, so it always sees the arguments in the |
312 | # expected order. |
313 | my $traits; |
314 | ( $traits, @_ ) = _strip_traits(@_); |
315 | |
8f30b86e |
316 | my $metaclass; |
317 | ( $metaclass, @_ ) = _strip_metaclass(@_); |
8a8856de |
318 | $metaclass = Moose::Util::resolve_metaclass_alias( |
319 | 'Class' => $metaclass |
320 | ) if defined $metaclass && length $metaclass; |
8f30b86e |
321 | |
96bb13ea |
322 | # Normally we could look at $_[0], but in some weird cases |
323 | # (involving goto &Moose::import), $_[0] ends as something |
324 | # else (like Squirrel). |
325 | my $class = $exporting_package; |
326 | |
327 | $CALLER = _get_caller(@_); |
328 | |
329 | # this works because both pragmas set $^H (see perldoc |
330 | # perlvar) which affects the current compilation - |
331 | # i.e. the file who use'd us - which is why we don't need |
332 | # to do anything special to make it affect that file |
333 | # rather than this one (which is already compiled) |
334 | |
335 | strict->import; |
336 | warnings->import; |
337 | |
96bb13ea |
338 | my $did_init_meta; |
339 | for my $c ( grep { $_->can('init_meta') } $class, @{$exports_from} ) { |
816208bc |
340 | # init_meta can apply a role, which when loaded uses |
341 | # Moose::Exporter, which in turn sets $CALLER, so we need |
342 | # to protect against that. |
fdeb8354 |
343 | local $CALLER = $CALLER; |
89bcd625 |
344 | $c->init_meta( for_class => $CALLER, metaclass => $metaclass ); |
96bb13ea |
345 | $did_init_meta = 1; |
346 | } |
e606ae5f |
347 | |
96bb13ea |
348 | if ( $did_init_meta && @{$traits} ) { |
349 | # The traits will use Moose::Role, which in turn uses |
350 | # Moose::Exporter, which in turn sets $CALLER, so we need |
351 | # to protect against that. |
352 | local $CALLER = $CALLER; |
353 | _apply_meta_traits( $CALLER, $traits ); |
354 | } |
355 | elsif ( @{$traits} ) { |
70ea9161 |
356 | require Moose; |
96bb13ea |
357 | Moose->throw_error( |
358 | "Cannot provide traits when $class does not have an init_meta() method" |
359 | ); |
360 | } |
e606ae5f |
361 | |
96bb13ea |
362 | goto $exporter; |
363 | }; |
e606ae5f |
364 | } |
365 | |
96bb13ea |
366 | |
e606ae5f |
367 | sub _strip_traits { |
368 | my $idx = first_index { $_ eq '-traits' } @_; |
369 | |
370 | return ( [], @_ ) unless $idx >= 0 && $#_ >= $idx + 1; |
371 | |
372 | my $traits = $_[ $idx + 1 ]; |
373 | |
374 | splice @_, $idx, 2; |
375 | |
376 | $traits = [ $traits ] unless ref $traits; |
377 | |
378 | return ( $traits, @_ ); |
379 | } |
380 | |
8f30b86e |
381 | sub _strip_metaclass { |
382 | my $idx = first_index { $_ eq '-metaclass' } @_; |
383 | |
384 | return ( undef, @_ ) unless $idx >= 0 && $#_ >= $idx + 1; |
385 | |
386 | my $metaclass = $_[ $idx + 1 ]; |
387 | |
388 | splice @_, $idx, 2; |
389 | |
390 | return ( $metaclass, @_ ); |
391 | } |
392 | |
e606ae5f |
393 | sub _apply_meta_traits { |
394 | my ( $class, $traits ) = @_; |
395 | |
396 | return unless @{$traits}; |
397 | |
2571a16d |
398 | my $meta = Class::MOP::class_of($class); |
e606ae5f |
399 | |
400 | my $type = ( split /::/, ref $meta )[-1] |
c245d69b |
401 | or Moose->throw_error( |
e606ae5f |
402 | 'Cannot determine metaclass type for trait application . Meta isa ' |
4c0b3599 |
403 | . ref $meta ); |
e606ae5f |
404 | |
405 | my @resolved_traits |
386c056b |
406 | = map { |
407 | ref $_ ? $_ : Moose::Util::resolve_metatrait_alias( $type => $_ ) |
408 | } |
e606ae5f |
409 | @$traits; |
410 | |
411 | return unless @resolved_traits; |
412 | |
413 | Moose::Util::MetaRole::apply_metaclass_roles( |
414 | for_class => $class, |
415 | metaclass_roles => \@resolved_traits, |
416 | ); |
417 | } |
418 | |
419 | sub _get_caller { |
420 | # 1 extra level because it's called by import so there's a layer |
421 | # of indirection |
422 | my $offset = 1; |
423 | |
424 | return |
425 | ( ref $_[1] && defined $_[1]->{into} ) ? $_[1]->{into} |
426 | : ( ref $_[1] && defined $_[1]->{into_level} ) |
427 | ? caller( $offset + $_[1]->{into_level} ) |
428 | : caller($offset); |
429 | } |
430 | |
431 | sub _make_unimport_sub { |
432 | shift; |
433 | my $exporting_package = shift; |
434 | my $exports = shift; |
435 | my $export_recorder = shift; |
436 | |
437 | return sub { |
438 | my $caller = scalar caller(); |
439 | Moose::Exporter->_remove_keywords( |
440 | $caller, |
441 | [ keys %{$exports} ], |
442 | $export_recorder, |
443 | ); |
444 | }; |
445 | } |
446 | |
447 | sub _remove_keywords { |
448 | shift; |
449 | my $package = shift; |
450 | my $keywords = shift; |
451 | my $recorded_exports = shift; |
452 | |
453 | no strict 'refs'; |
454 | |
455 | foreach my $name ( @{ $keywords } ) { |
e606ae5f |
456 | if ( defined &{ $package . '::' . $name } ) { |
457 | my $sub = \&{ $package . '::' . $name }; |
458 | |
459 | # make sure it is from us |
460 | next unless $recorded_exports->{$sub}; |
461 | |
462 | # and if it is from us, then undef the slot |
463 | delete ${ $package . '::' }{$name}; |
464 | } |
465 | } |
466 | } |
467 | |
95056a1e |
468 | sub _make_init_meta { |
469 | shift; |
906eabcd |
470 | my $class = shift; |
471 | my $args = shift; |
95056a1e |
472 | |
473 | my %metaclass_roles; |
906eabcd |
474 | for my $role ( |
475 | map {"${_}_roles"} |
476 | qw(metaclass |
477 | attribute_metaclass |
478 | method_metaclass |
479 | wrapped_method_metaclass |
480 | instance_metaclass |
481 | constructor_class |
482 | destructor_class |
483 | error_class |
484 | application_to_class_class |
485 | application_to_role_class |
486 | application_to_instance_class) |
487 | ) { |
95056a1e |
488 | $metaclass_roles{$role} = $args->{$role} if exists $args->{$role}; |
489 | } |
490 | |
491 | my %base_class_roles; |
906eabcd |
492 | %base_class_roles = ( roles => $args->{base_class_roles} ) |
95056a1e |
493 | if exists $args->{base_class_roles}; |
494 | |
495 | return unless %metaclass_roles || %base_class_roles; |
496 | |
497 | return sub { |
498 | shift; |
499 | my %options = @_; |
906eabcd |
500 | |
501 | return unless Class::MOP::class_of( $options{for_class} ); |
502 | |
95056a1e |
503 | Moose::Util::MetaRole::apply_metaclass_roles( |
504 | for_class => $options{for_class}, |
505 | %metaclass_roles, |
506 | ); |
906eabcd |
507 | |
95056a1e |
508 | Moose::Util::MetaRole::apply_base_class_roles( |
509 | for_class => $options{for_class}, |
510 | %base_class_roles, |
906eabcd |
511 | ) |
512 | if Class::MOP::class_of( $options{for_class} ) |
513 | ->isa('Moose::Meta::Class'); |
514 | |
515 | return Class::MOP::class_of( $options{for_class} ); |
95056a1e |
516 | }; |
517 | } |
518 | |
e2fa092d |
519 | sub import { |
520 | strict->import; |
521 | warnings->import; |
522 | } |
523 | |
e606ae5f |
524 | 1; |
525 | |
526 | __END__ |
527 | |
528 | =head1 NAME |
529 | |
530 | Moose::Exporter - make an import() and unimport() just like Moose.pm |
531 | |
532 | =head1 SYNOPSIS |
533 | |
534 | package MyApp::Moose; |
535 | |
e606ae5f |
536 | use Moose (); |
537 | use Moose::Exporter; |
538 | |
539 | Moose::Exporter->setup_import_methods( |
5ac14e89 |
540 | with_meta => [ 'has_rw', 'sugar2' ], |
541 | as_is => [ 'sugar3', \&Some::Random::thing ], |
542 | also => 'Moose', |
e606ae5f |
543 | ); |
544 | |
82ad7804 |
545 | sub has_rw { |
5ac14e89 |
546 | my ( $meta, $name, %options ) = @_; |
547 | $meta->add_attribute( |
548 | $name, |
82ad7804 |
549 | is => 'rw', |
550 | %options, |
551 | ); |
552 | } |
553 | |
e606ae5f |
554 | # then later ... |
555 | package MyApp::User; |
556 | |
557 | use MyApp::Moose; |
558 | |
559 | has 'name'; |
6daad0b9 |
560 | has_rw 'size'; |
e606ae5f |
561 | thing; |
562 | |
563 | no MyApp::Moose; |
564 | |
565 | =head1 DESCRIPTION |
566 | |
fd7ab111 |
567 | This module encapsulates the exporting of sugar functions in a |
95056a1e |
568 | C<Moose.pm>-like manner. It does this by building custom C<import>, |
37e4fe95 |
569 | C<unimport>, and C<init_meta> methods for your module, based on a spec you |
570 | provide. |
e606ae5f |
571 | |
37e4fe95 |
572 | It also lets you "stack" Moose-alike modules so you can export Moose's sugar |
573 | as well as your own, along with sugar from any random C<MooseX> module, as |
574 | long as they all use C<Moose::Exporter>. This feature exists to let you bundle |
575 | a set of MooseX modules into a policy module that developers can use directly |
576 | instead of using Moose itself. |
e606ae5f |
577 | |
10e0127a |
578 | To simplify writing exporter modules, C<Moose::Exporter> also imports |
579 | C<strict> and C<warnings> into your exporter module, as well as into |
580 | modules that use it. |
581 | |
e606ae5f |
582 | =head1 METHODS |
583 | |
584 | This module provides two public methods: |
585 | |
4b68e0de |
586 | =over 4 |
587 | |
588 | =item B<< Moose::Exporter->setup_import_methods(...) >> |
e606ae5f |
589 | |
95056a1e |
590 | When you call this method, C<Moose::Exporter> builds custom C<import>, |
37e4fe95 |
591 | C<unimport>, and C<init_meta> methods for your module. The C<import> method |
592 | will export the functions you specify, and can also re-export functions |
593 | exported by some other module (like C<Moose.pm>). |
e606ae5f |
594 | |
37e4fe95 |
595 | The C<unimport> method cleans the caller's namespace of all the exported |
596 | functions. |
e606ae5f |
597 | |
37e4fe95 |
598 | If you pass any parameters for L<Moose::Util::MetaRole>, this method will |
599 | generate an C<init_meta> for you as well (see below for details). This |
600 | C<init_meta> will call C<Moose::Util::MetaRole::apply_metaclass_roles> and |
601 | C<Moose::Util::MetaRole::apply_base_class_roles> as needed. |
95056a1e |
602 | |
603 | Note that if any of these methods already exist, they will not be |
604 | overridden, you will have to use C<build_import_methods> to get the |
605 | coderef that would be installed. |
e606ae5f |
606 | |
607 | This method accepts the following parameters: |
608 | |
4b68e0de |
609 | =over 8 |
e606ae5f |
610 | |
5ac14e89 |
611 | =item * with_meta => [ ... ] |
e606ae5f |
612 | |
37e4fe95 |
613 | This list of function I<names only> will be wrapped and then exported. The |
5ac14e89 |
614 | wrapper will pass the metaclass object for the caller as its first argument. |
615 | |
616 | Many sugar functions will need to use this metaclass object to do something to |
617 | the calling package. |
e606ae5f |
618 | |
619 | =item * as_is => [ ... ] |
620 | |
37e4fe95 |
621 | This list of function names or sub references will be exported as-is. You can |
622 | identify a subroutine by reference, which is handy to re-export some other |
623 | module's functions directly by reference (C<\&Some::Package::function>). |
e606ae5f |
624 | |
37e4fe95 |
625 | If you do export some other package's function, this function will never be |
626 | removed by the C<unimport> method. The reason for this is we cannot know if |
627 | the caller I<also> explicitly imported the sub themselves, and therefore wants |
628 | to keep it. |
e05fb8ae |
629 | |
e606ae5f |
630 | =item * also => $name or \@names |
631 | |
632 | This is a list of modules which contain functions that the caller |
633 | wants to export. These modules must also use C<Moose::Exporter>. The |
634 | most common use case will be to export the functions from C<Moose.pm>. |
5ac14e89 |
635 | Functions specified by C<with_meta> or C<as_is> take precedence over |
ae8817b6 |
636 | functions exported by modules specified by C<also>, so that a module |
637 | can selectively override functions exported by another module. |
e606ae5f |
638 | |
639 | C<Moose::Exporter> also makes sure all these functions get removed |
640 | when C<unimport> is called. |
641 | |
642 | =back |
643 | |
95056a1e |
644 | Any of the C<*_roles> options for |
37e4fe95 |
645 | C<Moose::Util::MetaRole::apply_metaclass_roles> and |
646 | C<Moose::Util::MetaRole::base_class_roles> are also acceptable. |
95056a1e |
647 | |
4b68e0de |
648 | =item B<< Moose::Exporter->build_import_methods(...) >> |
e606ae5f |
649 | |
95056a1e |
650 | Returns two or three code refs, one for C<import>, one for |
651 | C<unimport>, and optionally one for C<init_meta>, if the appropriate |
652 | options are passed in. |
653 | |
37e4fe95 |
654 | Accepts the additional C<install> option, which accepts an arrayref of method |
655 | names to install into your exporting package. The valid options are C<import>, |
656 | C<unimport>, and C<init_meta>. Calling C<setup_import_methods> is equivalent |
657 | to calling C<build_import_methods> with C<< install => [qw(import unimport |
658 | init_meta)] >> except that it doesn't also return the methods. |
e606ae5f |
659 | |
660 | Used by C<setup_import_methods>. |
661 | |
4b68e0de |
662 | =back |
663 | |
e606ae5f |
664 | =head1 IMPORTING AND init_meta |
665 | |
37e4fe95 |
666 | If you want to set an alternative base object class or metaclass class, see |
667 | above for details on how this module can call L<Moose::Util::MetaRole> for |
668 | you. |
669 | |
670 | If you want to do something that is not supported by this module, simply |
671 | define an C<init_meta> method in your class. The C<import> method that |
672 | C<Moose::Exporter> generates for you will call this method (if it exists). It |
673 | will always pass the caller to this method via the C<for_class> parameter. |
e606ae5f |
674 | |
675 | Most of the time, your C<init_meta> method will probably just call C<< |
676 | Moose->init_meta >> to do the real work: |
677 | |
678 | sub init_meta { |
679 | shift; # our class name |
680 | return Moose->init_meta( @_, metaclass => 'My::Metaclass' ); |
681 | } |
682 | |
95056a1e |
683 | Keep in mind that C<build_import_methods> will return an C<init_meta> |
684 | method for you, which you can also call from within your custom |
37e4fe95 |
685 | C<init_meta>: |
686 | |
687 | my ( $import, $unimport, $init_meta ) = |
688 | Moose::Exporter->build_import_methods( ... ); |
689 | |
690 | sub import { |
691 | my $class = shift; |
692 | |
693 | ... |
694 | |
695 | $class->$import(...); |
696 | |
697 | ... |
698 | } |
699 | |
700 | sub unimport { goto &$unimport } |
701 | |
702 | sub init_meta { |
703 | my $class = shift; |
704 | |
705 | ... |
706 | |
707 | $class->$init_meta(...); |
708 | |
709 | ... |
710 | } |
95056a1e |
711 | |
e606ae5f |
712 | =head1 METACLASS TRAITS |
713 | |
714 | The C<import> method generated by C<Moose::Exporter> will allow the |
715 | user of your module to specify metaclass traits in a C<-traits> |
716 | parameter passed as part of the import: |
717 | |
718 | use Moose -traits => 'My::Meta::Trait'; |
719 | |
720 | use Moose -traits => [ 'My::Meta::Trait', 'My::Other::Trait' ]; |
721 | |
722 | These traits will be applied to the caller's metaclass |
723 | instance. Providing traits for an exporting class that does not create |
724 | a metaclass for the caller is an error. |
725 | |
726 | =head1 AUTHOR |
727 | |
728 | Dave Rolsky E<lt>autarch@urth.orgE<gt> |
729 | |
730 | This is largely a reworking of code in Moose.pm originally written by |
731 | Stevan Little and others. |
732 | |
733 | =head1 COPYRIGHT AND LICENSE |
734 | |
2840a3b2 |
735 | Copyright 2009 by Infinity Interactive, Inc. |
e606ae5f |
736 | |
737 | L<http://www.iinteractive.com> |
738 | |
739 | This library is free software; you can redistribute it and/or modify |
740 | it under the same terms as Perl itself. |
741 | |
742 | =cut |