Commit | Line | Data |
4e036ee4 |
1 | |
2 | package Moose::Meta::TypeConstraint; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
ed90007b |
8 | use overload '0+' => sub { refaddr(shift) }, # id an object |
9 | '""' => sub { shift->name }, # stringify to tc name |
72e389bf |
10 | bool => sub { 1 }, |
b644e331 |
11 | fallback => 1; |
900466d6 |
12 | |
d49812bc |
13 | use Carp qw(confess); |
477a812e |
14 | use Eval::Closure; |
dabed765 |
15 | use Scalar::Util qw(blessed refaddr); |
9f2230e9 |
16 | use Sub::Name qw(subname); |
5a18346b |
17 | use Try::Tiny; |
66811d63 |
18 | |
e606ae5f |
19 | use base qw(Class::MOP::Object); |
20 | |
dc2b7cc8 |
21 | __PACKAGE__->meta->add_attribute('name' => ( |
22 | reader => 'name', |
23 | Class::MOP::_definition_context(), |
24 | )); |
3726f905 |
25 | __PACKAGE__->meta->add_attribute('parent' => ( |
26 | reader => 'parent', |
27 | predicate => 'has_parent', |
dc2b7cc8 |
28 | Class::MOP::_definition_context(), |
3726f905 |
29 | )); |
baf26cc6 |
30 | |
31 | my $null_constraint = sub { 1 }; |
d67145ed |
32 | __PACKAGE__->meta->add_attribute('constraint' => ( |
8de73ff1 |
33 | reader => 'constraint', |
34 | writer => '_set_constraint', |
dc2b7cc8 |
35 | default => sub { $null_constraint }, |
36 | Class::MOP::_definition_context(), |
d67145ed |
37 | )); |
dc2b7cc8 |
38 | |
76d37e5a |
39 | __PACKAGE__->meta->add_attribute('message' => ( |
40 | accessor => 'message', |
dc2b7cc8 |
41 | predicate => 'has_message', |
42 | Class::MOP::_definition_context(), |
76d37e5a |
43 | )); |
dc2b7cc8 |
44 | |
92a88343 |
45 | __PACKAGE__->meta->add_attribute('_default_message' => ( |
46 | accessor => '_default_message', |
dc2b7cc8 |
47 | Class::MOP::_definition_context(), |
92a88343 |
48 | )); |
dc2b7cc8 |
49 | |
92a88343 |
50 | # can't make this a default because it has to close over the type name, and |
51 | # cmop attributes don't have lazy |
52 | my $_default_message_generator = sub { |
53 | my $name = shift; |
54 | sub { |
55 | my $value = shift; |
56 | # have to load it late like this, since it uses Moose itself |
57 | my $can_partialdump = try { |
58 | # versions prior to 0.14 had a potential infinite loop bug |
59 | Class::MOP::load_class('Devel::PartialDump', { -version => 0.14 }); |
60 | 1; |
61 | }; |
62 | if ($can_partialdump) { |
63 | $value = Devel::PartialDump->new->dump($value); |
64 | } |
65 | else { |
66 | $value = (defined $value ? overload::StrVal($value) : 'undef'); |
67 | } |
68 | return "Validation failed for '" . $name . "' with value $value"; |
69 | } |
70 | }; |
a27aa600 |
71 | __PACKAGE__->meta->add_attribute('coercion' => ( |
72 | accessor => 'coercion', |
dc2b7cc8 |
73 | predicate => 'has_coercion', |
74 | Class::MOP::_definition_context(), |
a27aa600 |
75 | )); |
70ea9161 |
76 | |
c8cf9aaa |
77 | __PACKAGE__->meta->add_attribute('hand_optimized_type_constraint' => ( |
78 | init_arg => 'optimized', |
79 | accessor => 'hand_optimized_type_constraint', |
e27dfc11 |
80 | predicate => 'has_hand_optimized_type_constraint', |
dc2b7cc8 |
81 | Class::MOP::_definition_context(), |
c8cf9aaa |
82 | )); |
83 | |
4e36cf24 |
84 | __PACKAGE__->meta->add_attribute('inlined' => ( |
7487e61c |
85 | init_arg => 'inlined', |
4e36cf24 |
86 | accessor => 'inlined', |
7487e61c |
87 | predicate => '_has_inlined_type_constraint', |
dc2b7cc8 |
88 | Class::MOP::_definition_context(), |
4e36cf24 |
89 | )); |
90 | |
9c44971f |
91 | __PACKAGE__->meta->add_attribute('inline_environment' => ( |
92 | init_arg => 'inline_environment', |
ca789903 |
93 | accessor => '_inline_environment', |
9c44971f |
94 | default => sub { {} }, |
dc2b7cc8 |
95 | Class::MOP::_definition_context(), |
9c44971f |
96 | )); |
97 | |
bd72f3c8 |
98 | sub parents { |
99 | my $self; |
100 | $self->parent; |
101 | } |
102 | |
3726f905 |
103 | # private accessors |
104 | |
105 | __PACKAGE__->meta->add_attribute('compiled_type_constraint' => ( |
106 | accessor => '_compiled_type_constraint', |
dc2b7cc8 |
107 | predicate => '_has_compiled_type_constraint', |
108 | Class::MOP::_definition_context(), |
3726f905 |
109 | )); |
dc2b7cc8 |
110 | |
22aed3c0 |
111 | __PACKAGE__->meta->add_attribute('package_defined_in' => ( |
dc2b7cc8 |
112 | accessor => '_package_defined_in', |
113 | Class::MOP::_definition_context(), |
22aed3c0 |
114 | )); |
115 | |
e27dfc11 |
116 | sub new { |
a27aa600 |
117 | my $class = shift; |
8534c69a |
118 | my ($first, @rest) = @_; |
119 | my %args = ref $first ? %$first : $first ? ($first, @rest) : (); |
120 | $args{name} = $args{name} ? "$args{name}" : "__ANON__"; |
70ea9161 |
121 | |
d49812bc |
122 | if ( exists $args{message} |
123 | && (!ref($args{message}) || ref($args{message}) ne 'CODE') ) { |
124 | confess("The 'message' parameter must be a coderef"); |
125 | } |
126 | |
8534c69a |
127 | my $self = $class->_new(%args); |
3726f905 |
128 | $self->compile_type_constraint() |
129 | unless $self->_has_compiled_type_constraint; |
92a88343 |
130 | $self->_default_message($_default_message_generator->($self->name)) |
131 | unless $self->has_message; |
66811d63 |
132 | return $self; |
133 | } |
134 | |
8534c69a |
135 | |
136 | |
70ea9161 |
137 | sub coerce { |
138 | my $self = shift; |
139 | |
140 | my $coercion = $self->coercion; |
141 | |
142 | unless ($coercion) { |
143 | require Moose; |
144 | Moose->throw_error("Cannot coerce without a type coercion"); |
145 | } |
146 | |
02679ba4 |
147 | return $_[0] if $self->check($_[0]); |
148 | |
70ea9161 |
149 | return $coercion->coerce(@_); |
150 | } |
a1257460 |
151 | |
bb6ac54a |
152 | sub assert_coerce { |
153 | my $self = shift; |
154 | |
155 | my $coercion = $self->coercion; |
156 | |
157 | unless ($coercion) { |
158 | require Moose; |
159 | Moose->throw_error("Cannot coerce without a type coercion"); |
160 | } |
161 | |
162 | return $_[0] if $self->check($_[0]); |
163 | |
164 | my $result = $coercion->coerce(@_); |
165 | |
166 | $self->assert_valid($result); |
167 | |
168 | return $result; |
169 | } |
170 | |
a1257460 |
171 | sub check { |
172 | my ($self, @args) = @_; |
173 | my $constraint_subref = $self->_compiled_type_constraint; |
174 | return $constraint_subref->(@args) ? 1 : undef; |
175 | } |
176 | |
e27dfc11 |
177 | sub validate { |
76d37e5a |
178 | my ($self, $value) = @_; |
179 | if ($self->_compiled_type_constraint->($value)) { |
180 | return undef; |
181 | } |
182 | else { |
688fcdda |
183 | $self->get_message($value); |
76d37e5a |
184 | } |
185 | } |
186 | |
7c047a36 |
187 | sub can_be_inlined { |
7487e61c |
188 | my $self = shift; |
189 | |
92efe680 |
190 | if ( $self->has_parent && $self->constraint == $null_constraint ) { |
7c047a36 |
191 | return $self->parent->can_be_inlined; |
7487e61c |
192 | } |
193 | |
194 | return $self->_has_inlined_type_constraint; |
195 | } |
196 | |
4e36cf24 |
197 | sub _inline_check { |
198 | my $self = shift; |
199 | |
7c047a36 |
200 | unless ( $self->can_be_inlined ) { |
3f9c18f3 |
201 | require Moose; |
202 | Moose->throw_error( 'Cannot inline a type constraint check for ' . $self->name ); |
203 | } |
4e36cf24 |
204 | |
92efe680 |
205 | if ( $self->has_parent && $self->constraint == $null_constraint ) { |
7487e61c |
206 | return $self->parent->_inline_check(@_); |
207 | } |
208 | |
e6fff671 |
209 | return '( do { ' . $self->inlined->( $self, @_ ) . ' } )'; |
4e36cf24 |
210 | } |
211 | |
ca789903 |
212 | sub inline_environment { |
213 | my $self = shift; |
214 | |
215 | if ( $self->has_parent && $self->constraint == $null_constraint ) { |
216 | return $self->parent->inline_environment; |
217 | } |
218 | |
219 | return $self->_inline_environment; |
220 | } |
221 | |
c24269b3 |
222 | sub assert_valid { |
223 | my ($self, $value) = @_; |
224 | |
225 | my $error = $self->validate($value); |
226 | return 1 if ! defined $error; |
227 | |
228 | require Moose; |
229 | Moose->throw_error($error); |
230 | } |
231 | |
688fcdda |
232 | sub get_message { |
233 | my ($self, $value) = @_; |
d49812bc |
234 | my $msg = $self->has_message |
235 | ? $self->message |
236 | : $self->_default_message; |
92a88343 |
237 | local $_ = $value; |
238 | return $msg->($value); |
688fcdda |
239 | } |
240 | |
3726f905 |
241 | ## type predicates ... |
242 | |
d9e17f80 |
243 | sub equals { |
244 | my ( $self, $type_or_name ) = @_; |
245 | |
e606ae5f |
246 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return; |
dabed765 |
247 | |
0677975f |
248 | return 1 if $self == $other; |
dabed765 |
249 | |
250 | if ( $self->has_hand_optimized_type_constraint and $other->has_hand_optimized_type_constraint ) { |
251 | return 1 if $self->hand_optimized_type_constraint == $other->hand_optimized_type_constraint; |
252 | } |
253 | |
254 | return unless $self->constraint == $other->constraint; |
255 | |
256 | if ( $self->has_parent ) { |
257 | return unless $other->has_parent; |
258 | return unless $self->parent->equals( $other->parent ); |
259 | } else { |
260 | return if $other->has_parent; |
261 | } |
d9e17f80 |
262 | |
05a5763c |
263 | return; |
d9e17f80 |
264 | } |
265 | |
b26e162e |
266 | sub is_a_type_of { |
d9e17f80 |
267 | my ($self, $type_or_name) = @_; |
268 | |
e606ae5f |
269 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return; |
d9e17f80 |
270 | |
271 | ($self->equals($type) || $self->is_subtype_of($type)); |
b26e162e |
272 | } |
273 | |
cce8198b |
274 | sub is_subtype_of { |
d9e17f80 |
275 | my ($self, $type_or_name) = @_; |
276 | |
e606ae5f |
277 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return; |
d9e17f80 |
278 | |
cce8198b |
279 | my $current = $self; |
d9e17f80 |
280 | |
cce8198b |
281 | while (my $parent = $current->parent) { |
d9e17f80 |
282 | return 1 if $parent->equals($type); |
cce8198b |
283 | $current = $parent; |
284 | } |
d9e17f80 |
285 | |
cce8198b |
286 | return 0; |
287 | } |
288 | |
3726f905 |
289 | ## compiling the type constraint |
290 | |
291 | sub compile_type_constraint { |
292 | my $self = shift; |
293 | $self->_compiled_type_constraint($self->_actually_compile_type_constraint); |
451c8248 |
294 | } |
295 | |
3726f905 |
296 | ## type compilers ... |
297 | |
298 | sub _actually_compile_type_constraint { |
299 | my $self = shift; |
e27dfc11 |
300 | |
3726f905 |
301 | return $self->_compile_hand_optimized_type_constraint |
302 | if $self->has_hand_optimized_type_constraint; |
e27dfc11 |
303 | |
7c047a36 |
304 | if ( $self->can_be_inlined ) { |
477a812e |
305 | return eval_closure( |
9c44971f |
306 | source => 'sub { ' . $self->_inline_check('$_[0]') . ' }', |
307 | environment => $self->inline_environment, |
477a812e |
308 | ); |
43837b8a |
309 | } |
310 | |
3726f905 |
311 | my $check = $self->constraint; |
70ea9161 |
312 | unless ( defined $check ) { |
313 | require Moose; |
314 | Moose->throw_error( "Could not compile type constraint '" |
e27dfc11 |
315 | . $self->name |
70ea9161 |
316 | . "' because no constraint check" ); |
317 | } |
e27dfc11 |
318 | |
3726f905 |
319 | return $self->_compile_subtype($check) |
320 | if $self->has_parent; |
e27dfc11 |
321 | |
3726f905 |
322 | return $self->_compile_type($check); |
323 | } |
324 | |
325 | sub _compile_hand_optimized_type_constraint { |
326 | my $self = shift; |
e27dfc11 |
327 | |
3726f905 |
328 | my $type_constraint = $self->hand_optimized_type_constraint; |
e27dfc11 |
329 | |
70ea9161 |
330 | unless ( ref $type_constraint ) { |
331 | require Moose; |
70ea9161 |
332 | Moose->throw_error("Hand optimized type constraint is not a code reference"); |
333 | } |
42bc21a4 |
334 | |
335 | return $type_constraint; |
3726f905 |
336 | } |
337 | |
338 | sub _compile_subtype { |
339 | my ($self, $check) = @_; |
e27dfc11 |
340 | |
baf26cc6 |
341 | # gather all the parent constraintss in order |
3726f905 |
342 | my @parents; |
baf26cc6 |
343 | my $optimized_parent; |
3726f905 |
344 | foreach my $parent ($self->_collect_all_parents) { |
baf26cc6 |
345 | # if a parent is optimized, the optimized constraint already includes |
346 | # all of its parents tcs, so we can break the loop |
3726f905 |
347 | if ($parent->has_hand_optimized_type_constraint) { |
baf26cc6 |
348 | push @parents => $optimized_parent = $parent->hand_optimized_type_constraint; |
e27dfc11 |
349 | last; |
3726f905 |
350 | } |
351 | else { |
baf26cc6 |
352 | push @parents => $parent->constraint; |
3726f905 |
353 | } |
354 | } |
e27dfc11 |
355 | |
baf26cc6 |
356 | @parents = grep { $_ != $null_constraint } reverse @parents; |
357 | |
358 | unless ( @parents ) { |
359 | return $self->_compile_type($check); |
360 | } elsif( $optimized_parent and @parents == 1 ) { |
361 | # the case of just one optimized parent is optimized to prevent |
362 | # looping and the unnecessary localization |
b5981f07 |
363 | if ( $check == $null_constraint ) { |
364 | return $optimized_parent; |
365 | } else { |
9f2230e9 |
366 | return subname($self->name, sub { |
b5981f07 |
367 | return undef unless $optimized_parent->($_[0]); |
a1257460 |
368 | my (@args) = @_; |
369 | local $_ = $args[0]; |
370 | $check->(@args); |
b5981f07 |
371 | }); |
372 | } |
baf26cc6 |
373 | } else { |
374 | # general case, check all the constraints, from the first parent to ourselves |
b5981f07 |
375 | my @checks = @parents; |
376 | push @checks, $check if $check != $null_constraint; |
9f2230e9 |
377 | return subname($self->name => sub { |
a1257460 |
378 | my (@args) = @_; |
379 | local $_ = $args[0]; |
baf26cc6 |
380 | foreach my $check (@checks) { |
a1257460 |
381 | return undef unless $check->(@args); |
baf26cc6 |
382 | } |
383 | return 1; |
384 | }); |
385 | } |
3726f905 |
386 | } |
387 | |
388 | sub _compile_type { |
389 | my ($self, $check) = @_; |
baf26cc6 |
390 | |
391 | return $check if $check == $null_constraint; # Item, Any |
392 | |
9f2230e9 |
393 | return subname($self->name => sub { |
a1257460 |
394 | my (@args) = @_; |
395 | local $_ = $args[0]; |
396 | $check->(@args); |
1b2aea39 |
397 | }); |
3726f905 |
398 | } |
399 | |
400 | ## other utils ... |
401 | |
402 | sub _collect_all_parents { |
403 | my $self = shift; |
404 | my @parents; |
405 | my $current = $self->parent; |
406 | while (defined $current) { |
407 | push @parents => $current; |
408 | $current = $current->parent; |
409 | } |
410 | return @parents; |
411 | } |
412 | |
85a9908f |
413 | sub create_child_type { |
9ceb576e |
414 | my ($self, %opts) = @_; |
415 | my $class = ref $self; |
416 | return $class->new(%opts, parent => $self); |
417 | } |
418 | |
4e036ee4 |
419 | 1; |
420 | |
ad46f524 |
421 | # ABSTRACT: The Moose Type Constraint metaclass |
422 | |
4e036ee4 |
423 | __END__ |
424 | |
425 | =pod |
426 | |
4e036ee4 |
427 | =head1 DESCRIPTION |
428 | |
cfd006f0 |
429 | This class represents a single type constraint. Moose's built-in type |
76127c77 |
430 | constraints, as well as constraints you define, are all stored in a |
cfd006f0 |
431 | L<Moose::Meta::TypeConstraint::Registry> object as objects of this |
432 | class. |
6ba6d68c |
433 | |
baf46b9e |
434 | =head1 INHERITANCE |
435 | |
436 | C<Moose::Meta::TypeConstraint> is a subclass of L<Class::MOP::Object>. |
437 | |
4e036ee4 |
438 | =head1 METHODS |
439 | |
440 | =over 4 |
441 | |
cfd006f0 |
442 | =item B<< Moose::Meta::TypeConstraint->new(%options) >> |
4e036ee4 |
443 | |
cfd006f0 |
444 | This creates a new type constraint based on the provided C<%options>: |
4e036ee4 |
445 | |
cfd006f0 |
446 | =over 8 |
d9e17f80 |
447 | |
cfd006f0 |
448 | =item * name |
e606ae5f |
449 | |
cfd006f0 |
450 | The constraint name. If a name is not provided, it will be set to |
451 | "__ANON__". |
b26e162e |
452 | |
cfd006f0 |
453 | =item * parent |
b26e162e |
454 | |
cfd006f0 |
455 | A C<Moose::Meta::TypeConstraint> object which is the parent type for |
456 | the type being created. This is optional. |
cce8198b |
457 | |
cfd006f0 |
458 | =item * constraint |
e606ae5f |
459 | |
cfd006f0 |
460 | This is the subroutine reference that implements the actual constraint |
461 | check. This defaults to a subroutine which always returns true. |
6ba6d68c |
462 | |
cfd006f0 |
463 | =item * message |
0a5bd159 |
464 | |
cfd006f0 |
465 | A subroutine reference which is used to generate an error message when |
466 | the constraint fails. This is optional. |
0a5bd159 |
467 | |
cfd006f0 |
468 | =item * coercion |
76d37e5a |
469 | |
cfd006f0 |
470 | A L<Moose::Meta::TypeCoercion> object representing the coercions to |
471 | the type. This is optional. |
76d37e5a |
472 | |
7142d232 |
473 | =item * inlined |
474 | |
475 | A subroutine which returns a string suitable for inlining this type |
476 | constraint. It will be called as a method on the type constraint object, and |
477 | will receive a single additional parameter, a variable name to be tested |
478 | (usually C<"$_"> or C<"$_[0]">. |
479 | |
480 | This is optional. |
481 | |
482 | =item * inline_environment |
483 | |
484 | A hash reference of variables to close over. The keys are variables names, and |
485 | the values are I<references> to the variables. |
486 | |
cfd006f0 |
487 | =item * optimized |
76d37e5a |
488 | |
7142d232 |
489 | B<This option is deprecated.> |
490 | |
cfd006f0 |
491 | This is a variant of the C<constraint> parameter that is somehow |
492 | optimized. Typically, this means incorporating both the type's |
493 | constraint and all of its parents' constraints into a single |
494 | subroutine reference. |
6ba6d68c |
495 | |
cfd006f0 |
496 | =back |
4e036ee4 |
497 | |
cfd006f0 |
498 | =item B<< $constraint->equals($type_name_or_object) >> |
e606ae5f |
499 | |
cfd006f0 |
500 | Returns true if the supplied name or type object is the same as the |
501 | current type. |
66811d63 |
502 | |
cfd006f0 |
503 | =item B<< $constraint->is_subtype_of($type_name_or_object) >> |
e606ae5f |
504 | |
cfd006f0 |
505 | Returns true if the supplied name or type object is a parent of the |
506 | current type. |
3726f905 |
507 | |
cfd006f0 |
508 | =item B<< $constraint->is_a_type_of($type_name_or_object) >> |
e606ae5f |
509 | |
cfd006f0 |
510 | Returns true if the given type is the same as the current type, or is |
511 | a parent of the current type. This is a shortcut for checking |
512 | C<equals> and C<is_subtype_of>. |
d9e17f80 |
513 | |
cfd006f0 |
514 | =item B<< $constraint->coerce($value) >> |
2f7e4042 |
515 | |
b2894aea |
516 | This will attempt to coerce the value to the type. If the type does not |
cfd006f0 |
517 | have any defined coercions this will throw an error. |
66811d63 |
518 | |
572b5187 |
519 | If no coercion can produce a value matching C<$constraint>, the original |
520 | value is returned. |
521 | |
086c6b6c |
522 | =item B<< $constraint->assert_coerce($value) >> |
572b5187 |
523 | |
524 | This method behaves just like C<coerce>, but if the result is not valid |
525 | according to C<$constraint>, an error is thrown. |
526 | |
cfd006f0 |
527 | =item B<< $constraint->check($value) >> |
2f7e4042 |
528 | |
cfd006f0 |
529 | Returns true if the given value passes the constraint for the type. |
76d37e5a |
530 | |
cfd006f0 |
531 | =item B<< $constraint->validate($value) >> |
2f7e4042 |
532 | |
cfd006f0 |
533 | This is similar to C<check>. However, if the type I<is valid> then the |
534 | method returns an explicit C<undef>. If the type is not valid, we call |
535 | C<< $self->get_message($value) >> internally to generate an error |
536 | message. |
76d37e5a |
537 | |
952320e0 |
538 | =item B<< $constraint->assert_valid($value) >> |
539 | |
540 | Like C<check> and C<validate>, this method checks whether C<$value> is |
541 | valid under the constraint. If it is, it will return true. If it is not, |
542 | an exception will be thrown with the results of |
543 | C<< $self->get_message($value) >>. |
544 | |
cfd006f0 |
545 | =item B<< $constraint->name >> |
2f7e4042 |
546 | |
cfd006f0 |
547 | Returns the type's name, as provided to the constructor. |
688fcdda |
548 | |
cfd006f0 |
549 | =item B<< $constraint->parent >> |
2f7e4042 |
550 | |
cfd006f0 |
551 | Returns the type's parent, as provided to the constructor, if any. |
4e036ee4 |
552 | |
cfd006f0 |
553 | =item B<< $constraint->has_parent >> |
2f7e4042 |
554 | |
cfd006f0 |
555 | Returns true if the type has a parent type. |
a27aa600 |
556 | |
cfd006f0 |
557 | =item B<< $constraint->parents >> |
2f7e4042 |
558 | |
cfd006f0 |
559 | A synonym for C<parent>. This is useful for polymorphism with types |
560 | that can have more than one parent. |
c8cf9aaa |
561 | |
cfd006f0 |
562 | =item B<< $constraint->constraint >> |
c8cf9aaa |
563 | |
cfd006f0 |
564 | Returns the type's constraint, as provided to the constructor. |
9ceb576e |
565 | |
cfd006f0 |
566 | =item B<< $constraint->get_message($value) >> |
4e036ee4 |
567 | |
cfd006f0 |
568 | This generates a method for the given value. If the type does not have |
569 | an explicit message, we generate a default message. |
3726f905 |
570 | |
cfd006f0 |
571 | =item B<< $constraint->has_message >> |
572 | |
573 | Returns true if the type has a message. |
574 | |
575 | =item B<< $constraint->message >> |
576 | |
577 | Returns the type's message as a subroutine reference. |
578 | |
579 | =item B<< $constraint->coercion >> |
580 | |
581 | Returns the type's L<Moose::Meta::TypeCoercion> object, if one |
582 | exists. |
583 | |
584 | =item B<< $constraint->has_coercion >> |
585 | |
586 | Returns true if the type has a coercion. |
587 | |
7142d232 |
588 | =item B<< $constraint->can_be_inlined >> |
589 | |
590 | Returns true if this type constraint can be inlined. A type constraint which |
591 | subtypes an inlinable constraint and does not add an additional constraint |
592 | "inherits" its parent type's inlining. |
593 | |
cfd006f0 |
594 | =item B<< $constraint->hand_optimized_type_constraint >> |
595 | |
7142d232 |
596 | B<This method is deprecated.> |
597 | |
cfd006f0 |
598 | Returns the type's hand optimized constraint, as provided to the |
599 | constructor via the C<optimized> option. |
600 | |
601 | =item B<< $constraint->has_hand_optimized_type_constraint >> |
602 | |
7142d232 |
603 | B<This method is deprecated.> |
604 | |
cfd006f0 |
605 | Returns true if the type has an optimized constraint. |
606 | |
607 | =item B<< $constraint->create_child_type(%options) >> |
451c8248 |
608 | |
cfd006f0 |
609 | This returns a new type constraint of the same class using the |
610 | provided C<%options>. The C<parent> option will be the current type. |
3726f905 |
611 | |
cfd006f0 |
612 | This method exists so that subclasses of this class can override this |
613 | behavior and change how child types are created. |
451c8248 |
614 | |
615 | =back |
616 | |
4e036ee4 |
617 | =head1 BUGS |
618 | |
d4048ef3 |
619 | See L<Moose/BUGS> for details on reporting bugs. |
4e036ee4 |
620 | |
c8cf9aaa |
621 | =cut |