Commit | Line | Data |
e606ae5f |
1 | package Moose::Exporter; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
9039e8ec |
6 | our $VERSION = '0.89_01'; |
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 | |
45975bce |
40 | my ( $exports, $is_removable, $groups ) |
e05fb8ae |
41 | = $class->_make_sub_exporter_params( |
f44ec924 |
42 | [ @exports_from, $exporting_package ], $export_recorder ); |
e606ae5f |
43 | |
44 | my $exporter = Sub::Exporter::build_exporter( |
45 | { |
46 | exports => $exports, |
45975bce |
47 | groups => { default => [':all'], %$groups } |
e606ae5f |
48 | } |
49 | ); |
50 | |
95056a1e |
51 | my %methods; |
e606ae5f |
52 | # $args{_export_to_main} exists for backwards compat, because |
53 | # Moose::Util::TypeConstraints did export to main (unlike Moose & |
54 | # Moose::Role). |
95056a1e |
55 | $methods{import} = $class->_make_import_sub( $exporting_package, |
56 | $exporter, \@exports_from, $args{_export_to_main} ); |
e606ae5f |
57 | |
95056a1e |
58 | $methods{unimport} = $class->_make_unimport_sub( $exporting_package, |
59 | $exports, $is_removable, $export_recorder ); |
60 | |
61 | $methods{init_meta} = $class->_make_init_meta( $exporting_package, |
62 | \%args ); |
63 | |
64 | my $package = Class::MOP::Package->initialize($exporting_package); |
906eabcd |
65 | for my $to_install ( @{ $args{install} || [] } ) { |
95056a1e |
66 | my $symbol = '&' . $to_install; |
906eabcd |
67 | next |
68 | unless $methods{$to_install} |
69 | && !$package->has_package_symbol($symbol); |
70 | $package->add_package_symbol( $symbol, $methods{$to_install} ); |
95056a1e |
71 | } |
e606ae5f |
72 | |
95056a1e |
73 | return ( $methods{import}, $methods{unimport}, $methods{init_meta} ) |
e606ae5f |
74 | } |
75 | |
76 | { |
77 | my $seen = {}; |
78 | |
79 | sub _follow_also { |
80 | my $class = shift; |
81 | my $exporting_package = shift; |
82 | |
83 | local %$seen = ( $exporting_package => 1 ); |
84 | |
85 | return uniq( _follow_also_real($exporting_package) ); |
86 | } |
87 | |
88 | sub _follow_also_real { |
89 | my $exporting_package = shift; |
90 | |
ba1a3c2f |
91 | if (!exists $EXPORT_SPEC{$exporting_package}) { |
92 | my $loaded = Class::MOP::is_class_loaded($exporting_package); |
93 | |
94 | die "Package in also ($exporting_package) does not seem to " |
95 | . "use Moose::Exporter" |
96 | . ($loaded ? "" : " (is it loaded?)"); |
97 | } |
e606ae5f |
98 | |
99 | my $also = $EXPORT_SPEC{$exporting_package}{also}; |
100 | |
101 | return unless defined $also; |
102 | |
103 | my @also = ref $also ? @{$also} : $also; |
104 | |
105 | for my $package (@also) |
106 | { |
f5d03831 |
107 | die "Circular reference in also parameter to Moose::Exporter between $exporting_package and $package" |
e606ae5f |
108 | if $seen->{$package}; |
109 | |
110 | $seen->{$package} = 1; |
111 | } |
112 | |
113 | return @also, map { _follow_also_real($_) } @also; |
114 | } |
115 | } |
116 | |
117 | sub _make_sub_exporter_params { |
118 | my $class = shift; |
119 | my $packages = shift; |
120 | my $export_recorder = shift; |
121 | |
45975bce |
122 | my %groups; |
e606ae5f |
123 | my %exports; |
e05fb8ae |
124 | my %is_removable; |
e606ae5f |
125 | |
126 | for my $package ( @{$packages} ) { |
127 | my $args = $EXPORT_SPEC{$package} |
128 | or die "The $package package does not use Moose::Exporter\n"; |
129 | |
45975bce |
130 | # one group for each 'also' package |
131 | $groups{$package} = [ |
132 | @{ $args->{with_caller} || [] }, |
133 | @{ $args->{with_meta} || [] }, |
134 | @{ $args->{as_is} || [] }, |
135 | map ":$_", |
136 | keys %{ $args->{groups} || {} } |
137 | ]; |
138 | |
e606ae5f |
139 | for my $name ( @{ $args->{with_caller} } ) { |
140 | my $sub = do { |
141 | no strict 'refs'; |
142 | \&{ $package . '::' . $name }; |
143 | }; |
144 | |
145 | my $fq_name = $package . '::' . $name; |
146 | |
147 | $exports{$name} = $class->_make_wrapped_sub( |
148 | $fq_name, |
149 | $sub, |
150 | $export_recorder, |
151 | ); |
e05fb8ae |
152 | |
153 | $is_removable{$name} = 1; |
e606ae5f |
154 | } |
155 | |
45975bce |
156 | for my $name ( @{ $args->{with_meta} } ) { |
157 | my $sub = do { |
158 | no strict 'refs'; |
159 | \&{ $package . '::' . $name }; |
160 | }; |
161 | |
162 | my $fq_name = $package . '::' . $name; |
163 | |
164 | $exports{$name} = $class->_make_wrapped_sub_with_meta( |
165 | $fq_name, |
166 | $sub, |
167 | $export_recorder, |
168 | ); |
169 | |
170 | $is_removable{$name} = 1; |
171 | } |
172 | |
e606ae5f |
173 | for my $name ( @{ $args->{as_is} } ) { |
174 | my $sub; |
175 | |
176 | if ( ref $name ) { |
177 | $sub = $name; |
e05fb8ae |
178 | |
179 | # Even though Moose re-exports things from Carp & |
180 | # Scalar::Util, we don't want to remove those at |
181 | # unimport time, because the importing package may |
182 | # have imported them explicitly ala |
183 | # |
184 | # use Carp qw( confess ); |
185 | # |
186 | # This is a hack. Since we can't know whether they |
187 | # really want to keep these subs or not, we err on the |
188 | # safe side and leave them in. |
189 | my $coderef_pkg; |
190 | ( $coderef_pkg, $name ) = Class::MOP::get_code_info($name); |
191 | |
192 | $is_removable{$name} = $coderef_pkg eq $package ? 1 : 0; |
e606ae5f |
193 | } |
194 | else { |
195 | $sub = do { |
196 | no strict 'refs'; |
197 | \&{ $package . '::' . $name }; |
198 | }; |
e05fb8ae |
199 | |
200 | $is_removable{$name} = 1; |
e606ae5f |
201 | } |
202 | |
203 | $export_recorder->{$sub} = 1; |
204 | |
205 | $exports{$name} = sub {$sub}; |
206 | } |
45975bce |
207 | |
208 | for my $name ( keys %{ $args->{groups} } ) { |
209 | my $group = $args->{groups}{$name}; |
210 | |
211 | if (ref $group eq 'CODE') { |
212 | $groups{$name} = $class->_make_wrapped_group( |
213 | $package, |
214 | $group, |
215 | $export_recorder, |
216 | \%exports, |
217 | \%is_removable |
218 | ); |
219 | } |
220 | elsif (ref $group eq 'ARRAY') { |
221 | $groups{$name} = $group; |
222 | } |
223 | } |
e606ae5f |
224 | } |
225 | |
45975bce |
226 | return ( \%exports, \%is_removable, \%groups ); |
e606ae5f |
227 | } |
228 | |
96bb13ea |
229 | our $CALLER; |
230 | |
231 | sub _make_wrapped_sub { |
b4f00a34 |
232 | my $self = shift; |
96bb13ea |
233 | my $fq_name = shift; |
234 | my $sub = shift; |
235 | my $export_recorder = shift; |
236 | |
237 | # We need to set the package at import time, so that when |
238 | # package Foo imports has(), we capture "Foo" as the |
239 | # package. This lets other packages call Foo::has() and get |
240 | # the right package. This is done for backwards compatibility |
241 | # with existing production code, not because this is a good |
242 | # idea ;) |
243 | return sub { |
244 | my $caller = $CALLER; |
245 | |
6de00734 |
246 | my $wrapper = $self->_curry_wrapper($sub, $fq_name, $caller); |
b4f00a34 |
247 | |
9f2230e9 |
248 | my $sub = subname($fq_name => $wrapper); |
96bb13ea |
249 | |
250 | $export_recorder->{$sub} = 1; |
251 | |
252 | return $sub; |
253 | }; |
254 | } |
e606ae5f |
255 | |
45975bce |
256 | sub _make_wrapped_sub_with_meta { |
257 | my $self = shift; |
258 | my $fq_name = shift; |
259 | my $sub = shift; |
260 | my $export_recorder = shift; |
261 | |
262 | return sub { |
263 | my $caller = $CALLER; |
264 | |
265 | my $wrapper = $self->_late_curry_wrapper($sub, $fq_name, |
266 | sub { Class::MOP::class_of(shift) } => $caller); |
267 | |
268 | my $sub = subname($fq_name => $wrapper); |
269 | |
270 | $export_recorder->{$sub} = 1; |
271 | |
272 | return $sub; |
273 | }; |
274 | } |
275 | |
276 | sub _make_wrapped_group { |
277 | my $class = shift; |
278 | my $package = shift; # package calling use Moose::Exporter |
279 | my $sub = shift; |
280 | my $export_recorder = shift; |
281 | my $keywords = shift; |
282 | my $is_removable = shift; |
283 | |
284 | return sub { |
285 | my $caller = $CALLER; # package calling use PackageUsingMooseExporter -group => {args} |
286 | |
287 | # there are plenty of ways to deal with telling the code which |
288 | # package it lives in. the last arg (collector hashref) is |
289 | # otherwise unused, so we'll stick the original package in |
290 | # there and act like 'with_caller' by putting the calling |
291 | # package name as the first arg |
292 | $_[0] = $caller; |
293 | $_[3]{from} = $package; |
294 | |
295 | my $named_code = $sub->(@_); |
296 | $named_code ||= { }; |
297 | |
298 | # send invalid return value error up to Sub::Exporter |
299 | unless (ref $named_code eq 'HASH') { |
300 | return $named_code; |
301 | } |
302 | |
303 | for my $name (keys %$named_code) { |
304 | my $code = $named_code->{$name}; |
305 | |
306 | my $fq_name = $package . '::' . $name; |
307 | my $wrapper = $class->_curry_wrapper( |
308 | $code, |
309 | $fq_name, |
310 | $caller |
311 | ); |
312 | |
313 | my $sub = subname( $fq_name => $wrapper ); |
314 | $named_code->{$name} = $sub; |
315 | |
316 | # mark each coderef as ours |
317 | $keywords->{$name} = 1; |
318 | $is_removable->{$name} = 1; |
319 | $export_recorder->{$sub} = 1; |
320 | } |
321 | |
322 | return $named_code; |
323 | }; |
324 | } |
325 | |
6de00734 |
326 | sub _curry_wrapper { |
badbc528 |
327 | my $class = shift; |
b4f00a34 |
328 | my $sub = shift; |
329 | my $fq_name = shift; |
6de00734 |
330 | my @extra = @_; |
b4f00a34 |
331 | |
6de00734 |
332 | my $wrapper = sub { $sub->(@extra, @_) }; |
badbc528 |
333 | if (my $proto = prototype $sub) { |
2d7e979b |
334 | # XXX - Perl's prototype sucks. Use & to make set_prototype |
6de00734 |
335 | # ignore the fact that we're passing "private variables" |
2d7e979b |
336 | &Scalar::Util::set_prototype($wrapper, $proto); |
badbc528 |
337 | } |
338 | return $wrapper; |
b4f00a34 |
339 | } |
340 | |
45975bce |
341 | sub _late_curry_wrapper { |
342 | my $class = shift; |
343 | my $sub = shift; |
344 | my $fq_name = shift; |
345 | my $extra = shift; |
346 | my @ex_args = @_; |
347 | |
348 | my $wrapper = sub { |
349 | # resolve curried arguments at runtime via this closure |
350 | my @curry = ( $extra->( @ex_args ) ); |
351 | return $sub->(@curry, @_); |
352 | }; |
353 | |
354 | if (my $proto = prototype $sub) { |
355 | # XXX - Perl's prototype sucks. Use & to make set_prototype |
356 | # ignore the fact that we're passing "private variables" |
357 | &Scalar::Util::set_prototype($wrapper, $proto); |
358 | } |
359 | return $wrapper; |
360 | } |
361 | |
96bb13ea |
362 | sub _make_import_sub { |
363 | shift; |
364 | my $exporting_package = shift; |
365 | my $exporter = shift; |
366 | my $exports_from = shift; |
367 | my $export_to_main = shift; |
368 | |
369 | return sub { |
370 | |
371 | # I think we could use Sub::Exporter's collector feature |
372 | # to do this, but that would be rather gross, since that |
373 | # feature isn't really designed to return a value to the |
374 | # caller of the exporter sub. |
375 | # |
376 | # Also, this makes sure we preserve backwards compat for |
377 | # _get_caller, so it always sees the arguments in the |
378 | # expected order. |
379 | my $traits; |
380 | ( $traits, @_ ) = _strip_traits(@_); |
381 | |
8f30b86e |
382 | my $metaclass; |
383 | ( $metaclass, @_ ) = _strip_metaclass(@_); |
8a8856de |
384 | $metaclass = Moose::Util::resolve_metaclass_alias( |
385 | 'Class' => $metaclass |
386 | ) if defined $metaclass && length $metaclass; |
8f30b86e |
387 | |
96bb13ea |
388 | # Normally we could look at $_[0], but in some weird cases |
389 | # (involving goto &Moose::import), $_[0] ends as something |
390 | # else (like Squirrel). |
391 | my $class = $exporting_package; |
392 | |
393 | $CALLER = _get_caller(@_); |
394 | |
395 | # this works because both pragmas set $^H (see perldoc |
396 | # perlvar) which affects the current compilation - |
397 | # i.e. the file who use'd us - which is why we don't need |
398 | # to do anything special to make it affect that file |
399 | # rather than this one (which is already compiled) |
400 | |
401 | strict->import; |
402 | warnings->import; |
403 | |
404 | # we should never export to main |
405 | if ( $CALLER eq 'main' && !$export_to_main ) { |
406 | warn |
407 | qq{$class does not export its sugar to the 'main' package.\n}; |
408 | return; |
409 | } |
e606ae5f |
410 | |
96bb13ea |
411 | my $did_init_meta; |
412 | for my $c ( grep { $_->can('init_meta') } $class, @{$exports_from} ) { |
816208bc |
413 | # init_meta can apply a role, which when loaded uses |
414 | # Moose::Exporter, which in turn sets $CALLER, so we need |
415 | # to protect against that. |
fdeb8354 |
416 | local $CALLER = $CALLER; |
89bcd625 |
417 | $c->init_meta( for_class => $CALLER, metaclass => $metaclass ); |
96bb13ea |
418 | $did_init_meta = 1; |
419 | } |
e606ae5f |
420 | |
96bb13ea |
421 | if ( $did_init_meta && @{$traits} ) { |
422 | # The traits will use Moose::Role, which in turn uses |
423 | # Moose::Exporter, which in turn sets $CALLER, so we need |
424 | # to protect against that. |
425 | local $CALLER = $CALLER; |
426 | _apply_meta_traits( $CALLER, $traits ); |
427 | } |
428 | elsif ( @{$traits} ) { |
70ea9161 |
429 | require Moose; |
96bb13ea |
430 | Moose->throw_error( |
431 | "Cannot provide traits when $class does not have an init_meta() method" |
432 | ); |
433 | } |
e606ae5f |
434 | |
96bb13ea |
435 | goto $exporter; |
436 | }; |
e606ae5f |
437 | } |
438 | |
96bb13ea |
439 | |
e606ae5f |
440 | sub _strip_traits { |
441 | my $idx = first_index { $_ eq '-traits' } @_; |
442 | |
443 | return ( [], @_ ) unless $idx >= 0 && $#_ >= $idx + 1; |
444 | |
445 | my $traits = $_[ $idx + 1 ]; |
446 | |
447 | splice @_, $idx, 2; |
448 | |
449 | $traits = [ $traits ] unless ref $traits; |
450 | |
451 | return ( $traits, @_ ); |
452 | } |
453 | |
8f30b86e |
454 | sub _strip_metaclass { |
455 | my $idx = first_index { $_ eq '-metaclass' } @_; |
456 | |
457 | return ( undef, @_ ) unless $idx >= 0 && $#_ >= $idx + 1; |
458 | |
459 | my $metaclass = $_[ $idx + 1 ]; |
460 | |
461 | splice @_, $idx, 2; |
462 | |
463 | return ( $metaclass, @_ ); |
464 | } |
465 | |
e606ae5f |
466 | sub _apply_meta_traits { |
467 | my ( $class, $traits ) = @_; |
468 | |
469 | return unless @{$traits}; |
470 | |
2571a16d |
471 | my $meta = Class::MOP::class_of($class); |
e606ae5f |
472 | |
473 | my $type = ( split /::/, ref $meta )[-1] |
c245d69b |
474 | or Moose->throw_error( |
e606ae5f |
475 | 'Cannot determine metaclass type for trait application . Meta isa ' |
4c0b3599 |
476 | . ref $meta ); |
e606ae5f |
477 | |
478 | my @resolved_traits |
386c056b |
479 | = map { |
480 | ref $_ ? $_ : Moose::Util::resolve_metatrait_alias( $type => $_ ) |
481 | } |
e606ae5f |
482 | @$traits; |
483 | |
484 | return unless @resolved_traits; |
485 | |
486 | Moose::Util::MetaRole::apply_metaclass_roles( |
487 | for_class => $class, |
488 | metaclass_roles => \@resolved_traits, |
489 | ); |
490 | } |
491 | |
492 | sub _get_caller { |
493 | # 1 extra level because it's called by import so there's a layer |
494 | # of indirection |
495 | my $offset = 1; |
496 | |
497 | return |
498 | ( ref $_[1] && defined $_[1]->{into} ) ? $_[1]->{into} |
499 | : ( ref $_[1] && defined $_[1]->{into_level} ) |
500 | ? caller( $offset + $_[1]->{into_level} ) |
501 | : caller($offset); |
502 | } |
503 | |
504 | sub _make_unimport_sub { |
505 | shift; |
506 | my $exporting_package = shift; |
507 | my $exports = shift; |
e05fb8ae |
508 | my $is_removable = shift; |
e606ae5f |
509 | my $export_recorder = shift; |
510 | |
511 | return sub { |
512 | my $caller = scalar caller(); |
513 | Moose::Exporter->_remove_keywords( |
514 | $caller, |
515 | [ keys %{$exports} ], |
e05fb8ae |
516 | $is_removable, |
e606ae5f |
517 | $export_recorder, |
518 | ); |
519 | }; |
520 | } |
521 | |
522 | sub _remove_keywords { |
523 | shift; |
524 | my $package = shift; |
525 | my $keywords = shift; |
e05fb8ae |
526 | my $is_removable = shift; |
e606ae5f |
527 | my $recorded_exports = shift; |
528 | |
529 | no strict 'refs'; |
530 | |
531 | foreach my $name ( @{ $keywords } ) { |
e05fb8ae |
532 | next unless $is_removable->{$name}; |
e606ae5f |
533 | |
534 | if ( defined &{ $package . '::' . $name } ) { |
535 | my $sub = \&{ $package . '::' . $name }; |
536 | |
537 | # make sure it is from us |
538 | next unless $recorded_exports->{$sub}; |
539 | |
540 | # and if it is from us, then undef the slot |
541 | delete ${ $package . '::' }{$name}; |
542 | } |
543 | } |
544 | } |
545 | |
95056a1e |
546 | sub _make_init_meta { |
547 | shift; |
906eabcd |
548 | my $class = shift; |
549 | my $args = shift; |
95056a1e |
550 | |
551 | my %metaclass_roles; |
906eabcd |
552 | for my $role ( |
553 | map {"${_}_roles"} |
554 | qw(metaclass |
555 | attribute_metaclass |
556 | method_metaclass |
557 | wrapped_method_metaclass |
558 | instance_metaclass |
559 | constructor_class |
560 | destructor_class |
561 | error_class |
562 | application_to_class_class |
563 | application_to_role_class |
564 | application_to_instance_class) |
565 | ) { |
95056a1e |
566 | $metaclass_roles{$role} = $args->{$role} if exists $args->{$role}; |
567 | } |
568 | |
569 | my %base_class_roles; |
906eabcd |
570 | %base_class_roles = ( roles => $args->{base_class_roles} ) |
95056a1e |
571 | if exists $args->{base_class_roles}; |
572 | |
573 | return unless %metaclass_roles || %base_class_roles; |
574 | |
575 | return sub { |
576 | shift; |
577 | my %options = @_; |
906eabcd |
578 | |
579 | return unless Class::MOP::class_of( $options{for_class} ); |
580 | |
95056a1e |
581 | Moose::Util::MetaRole::apply_metaclass_roles( |
582 | for_class => $options{for_class}, |
583 | %metaclass_roles, |
584 | ); |
906eabcd |
585 | |
95056a1e |
586 | Moose::Util::MetaRole::apply_base_class_roles( |
587 | for_class => $options{for_class}, |
588 | %base_class_roles, |
906eabcd |
589 | ) |
590 | if Class::MOP::class_of( $options{for_class} ) |
591 | ->isa('Moose::Meta::Class'); |
592 | |
593 | return Class::MOP::class_of( $options{for_class} ); |
95056a1e |
594 | }; |
595 | } |
596 | |
e2fa092d |
597 | sub import { |
598 | strict->import; |
599 | warnings->import; |
600 | } |
601 | |
e606ae5f |
602 | 1; |
603 | |
604 | __END__ |
605 | |
606 | =head1 NAME |
607 | |
608 | Moose::Exporter - make an import() and unimport() just like Moose.pm |
609 | |
610 | =head1 SYNOPSIS |
611 | |
612 | package MyApp::Moose; |
613 | |
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614 | use Moose (); |
615 | use Moose::Exporter; |
616 | |
617 | Moose::Exporter->setup_import_methods( |
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618 | with_caller => [ 'has_rw', 'sugar2' ], |
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619 | as_is => [ 'sugar3', \&Some::Random::thing ], |
620 | also => 'Moose', |
621 | ); |
622 | |
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623 | sub has_rw { |
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624 | my ($caller, $name, %options) = @_; |
4a8a45bc |
625 | Class::MOP::class_of($caller)->add_attribute($name, |
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626 | is => 'rw', |
627 | %options, |
628 | ); |
629 | } |
630 | |
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631 | # then later ... |
632 | package MyApp::User; |
633 | |
634 | use MyApp::Moose; |
635 | |
636 | has 'name'; |
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637 | has_rw 'size'; |
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638 | thing; |
639 | |
640 | no MyApp::Moose; |
641 | |
642 | =head1 DESCRIPTION |
643 | |
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644 | This module encapsulates the exporting of sugar functions in a |
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645 | C<Moose.pm>-like manner. It does this by building custom C<import>, |
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646 | C<unimport>, and C<init_meta> methods for your module, based on a spec you |
647 | provide. |
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648 | |
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649 | It also lets you "stack" Moose-alike modules so you can export Moose's sugar |
650 | as well as your own, along with sugar from any random C<MooseX> module, as |
651 | long as they all use C<Moose::Exporter>. This feature exists to let you bundle |
652 | a set of MooseX modules into a policy module that developers can use directly |
653 | instead of using Moose itself. |
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654 | |
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655 | To simplify writing exporter modules, C<Moose::Exporter> also imports |
656 | C<strict> and C<warnings> into your exporter module, as well as into |
657 | modules that use it. |
658 | |
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659 | =head1 METHODS |
660 | |
661 | This module provides two public methods: |
662 | |
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663 | =over 4 |
664 | |
665 | =item B<< Moose::Exporter->setup_import_methods(...) >> |
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666 | |
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667 | When you call this method, C<Moose::Exporter> builds custom C<import>, |
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668 | C<unimport>, and C<init_meta> methods for your module. The C<import> method |
669 | will export the functions you specify, and can also re-export functions |
670 | exported by some other module (like C<Moose.pm>). |
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671 | |
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672 | The C<unimport> method cleans the caller's namespace of all the exported |
673 | functions. |
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674 | |
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675 | If you pass any parameters for L<Moose::Util::MetaRole>, this method will |
676 | generate an C<init_meta> for you as well (see below for details). This |
677 | C<init_meta> will call C<Moose::Util::MetaRole::apply_metaclass_roles> and |
678 | C<Moose::Util::MetaRole::apply_base_class_roles> as needed. |
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679 | |
680 | Note that if any of these methods already exist, they will not be |
681 | overridden, you will have to use C<build_import_methods> to get the |
682 | coderef that would be installed. |
683 | |
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684 | This method accepts the following parameters: |
685 | |
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686 | =over 8 |
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687 | |
688 | =item * with_caller => [ ... ] |
689 | |
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690 | This list of function I<names only> will be wrapped and then exported. The |
691 | wrapper will pass the name of the calling package as the first argument to the |
692 | function. Many sugar functions need to know their caller so they can get the |
693 | calling package's metaclass object. |
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694 | |
695 | =item * as_is => [ ... ] |
696 | |
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697 | This list of function names or sub references will be exported as-is. You can |
698 | identify a subroutine by reference, which is handy to re-export some other |
699 | module's functions directly by reference (C<\&Some::Package::function>). |
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700 | |
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701 | If you do export some other package's function, this function will never be |
702 | removed by the C<unimport> method. The reason for this is we cannot know if |
703 | the caller I<also> explicitly imported the sub themselves, and therefore wants |
704 | to keep it. |
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705 | |
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706 | =item * also => $name or \@names |
707 | |
708 | This is a list of modules which contain functions that the caller |
709 | wants to export. These modules must also use C<Moose::Exporter>. The |
710 | most common use case will be to export the functions from C<Moose.pm>. |
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711 | Functions specified by C<with_caller> or C<as_is> take precedence over |
712 | functions exported by modules specified by C<also>, so that a module |
713 | can selectively override functions exported by another module. |
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714 | |
715 | C<Moose::Exporter> also makes sure all these functions get removed |
716 | when C<unimport> is called. |
717 | |
718 | =back |
719 | |
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720 | Any of the C<*_roles> options for |
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721 | C<Moose::Util::MetaRole::apply_metaclass_roles> and |
722 | C<Moose::Util::MetaRole::base_class_roles> are also acceptable. |
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723 | |
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724 | =item B<< Moose::Exporter->build_import_methods(...) >> |
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725 | |
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726 | Returns two or three code refs, one for C<import>, one for |
727 | C<unimport>, and optionally one for C<init_meta>, if the appropriate |
728 | options are passed in. |
729 | |
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730 | Accepts the additional C<install> option, which accepts an arrayref of method |
731 | names to install into your exporting package. The valid options are C<import>, |
732 | C<unimport>, and C<init_meta>. Calling C<setup_import_methods> is equivalent |
733 | to calling C<build_import_methods> with C<< install => [qw(import unimport |
734 | init_meta)] >> except that it doesn't also return the methods. |
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735 | |
736 | Used by C<setup_import_methods>. |
737 | |
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738 | =back |
739 | |
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740 | =head1 IMPORTING AND init_meta |
741 | |
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742 | If you want to set an alternative base object class or metaclass class, see |
743 | above for details on how this module can call L<Moose::Util::MetaRole> for |
744 | you. |
745 | |
746 | If you want to do something that is not supported by this module, simply |
747 | define an C<init_meta> method in your class. The C<import> method that |
748 | C<Moose::Exporter> generates for you will call this method (if it exists). It |
749 | will always pass the caller to this method via the C<for_class> parameter. |
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750 | |
751 | Most of the time, your C<init_meta> method will probably just call C<< |
752 | Moose->init_meta >> to do the real work: |
753 | |
754 | sub init_meta { |
755 | shift; # our class name |
756 | return Moose->init_meta( @_, metaclass => 'My::Metaclass' ); |
757 | } |
758 | |
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759 | Keep in mind that C<build_import_methods> will return an C<init_meta> |
760 | method for you, which you can also call from within your custom |
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761 | C<init_meta>: |
762 | |
763 | my ( $import, $unimport, $init_meta ) = |
764 | Moose::Exporter->build_import_methods( ... ); |
765 | |
766 | sub import { |
767 | my $class = shift; |
768 | |
769 | ... |
770 | |
771 | $class->$import(...); |
772 | |
773 | ... |
774 | } |
775 | |
776 | sub unimport { goto &$unimport } |
777 | |
778 | sub init_meta { |
779 | my $class = shift; |
780 | |
781 | ... |
782 | |
783 | $class->$init_meta(...); |
784 | |
785 | ... |
786 | } |
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787 | |
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788 | =head1 METACLASS TRAITS |
789 | |
790 | The C<import> method generated by C<Moose::Exporter> will allow the |
791 | user of your module to specify metaclass traits in a C<-traits> |
792 | parameter passed as part of the import: |
793 | |
794 | use Moose -traits => 'My::Meta::Trait'; |
795 | |
796 | use Moose -traits => [ 'My::Meta::Trait', 'My::Other::Trait' ]; |
797 | |
798 | These traits will be applied to the caller's metaclass |
799 | instance. Providing traits for an exporting class that does not create |
800 | a metaclass for the caller is an error. |
801 | |
802 | =head1 AUTHOR |
803 | |
804 | Dave Rolsky E<lt>autarch@urth.orgE<gt> |
805 | |
806 | This is largely a reworking of code in Moose.pm originally written by |
807 | Stevan Little and others. |
808 | |
809 | =head1 COPYRIGHT AND LICENSE |
810 | |
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811 | Copyright 2009 by Infinity Interactive, Inc. |
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812 | |
813 | L<http://www.iinteractive.com> |
814 | |
815 | This library is free software; you can redistribute it and/or modify |
816 | it under the same terms as Perl itself. |
817 | |
818 | =cut |