Commit | Line | Data |
306290e8 |
1 | package Mouse::Meta::Attribute; |
c3398f5b |
2 | use strict; |
3 | use warnings; |
3b8fe109 |
4 | require overload; |
c3398f5b |
5 | |
6 | use Carp 'confess'; |
6c169c50 |
7 | use Scalar::Util (); |
c3398f5b |
8 | |
9 | sub new { |
2608b115 |
10 | my ($class, $name, %options) = @_; |
c3398f5b |
11 | |
2608b115 |
12 | $options{name} = $name; |
2e7e86c6 |
13 | |
2608b115 |
14 | $options{init_arg} = $name |
15 | unless exists $options{init_arg}; |
45959ffa |
16 | |
2608b115 |
17 | $options{is} ||= ''; |
c3398f5b |
18 | |
2608b115 |
19 | bless \%options, $class; |
c3398f5b |
20 | } |
21 | |
f6715552 |
22 | sub name { $_[0]->{name} } |
23 | sub associated_class { $_[0]->{associated_class} } |
24 | sub _is_metadata { $_[0]->{is} } |
25 | sub is_required { $_[0]->{required} } |
26 | sub default { $_[0]->{default} } |
27 | sub is_lazy { $_[0]->{lazy} } |
28 | sub is_lazy_build { $_[0]->{lazy_build} } |
29 | sub predicate { $_[0]->{predicate} } |
30 | sub clearer { $_[0]->{clearer} } |
31 | sub handles { $_[0]->{handles} } |
32 | sub is_weak_ref { $_[0]->{weak_ref} } |
33 | sub init_arg { $_[0]->{init_arg} } |
34 | sub type_constraint { $_[0]->{type_constraint} } |
35 | sub trigger { $_[0]->{trigger} } |
36 | sub builder { $_[0]->{builder} } |
37 | sub should_auto_deref { $_[0]->{auto_deref} } |
38 | sub should_coerce { $_[0]->{should_coerce} } |
39 | sub find_type_constraint { $_[0]->{find_type_constraint} } |
c3398f5b |
40 | |
f6715552 |
41 | sub has_default { exists $_[0]->{default} } |
42 | sub has_predicate { exists $_[0]->{predicate} } |
43 | sub has_clearer { exists $_[0]->{clearer} } |
44 | sub has_handles { exists $_[0]->{handles} } |
45 | sub has_type_constraint { exists $_[0]->{type_constraint} } |
46 | sub has_trigger { exists $_[0]->{trigger} } |
47 | sub has_builder { exists $_[0]->{builder} } |
eec1bb49 |
48 | |
1bfebf5f |
49 | sub _create_args { |
50 | $_[0]->{_create_args} = $_[1] if @_ > 1; |
51 | $_[0]->{_create_args} |
52 | } |
53 | |
7f7406a5 |
54 | sub inlined_name { |
55 | my $self = shift; |
56 | my $name = $self->name; |
57 | my $key = "'" . $name . "'"; |
58 | return $key; |
59 | } |
60 | |
c3398f5b |
61 | sub generate_accessor { |
62 | my $attribute = shift; |
63 | |
32af3489 |
64 | my $name = $attribute->name; |
65 | my $default = $attribute->default; |
32af3489 |
66 | my $constraint = $attribute->find_type_constraint; |
67 | my $builder = $attribute->builder; |
68 | my $trigger = $attribute->trigger; |
69 | my $is_weak = $attribute->is_weak_ref; |
70 | my $should_deref = $attribute->should_auto_deref; |
71 | my $should_coerce = $attribute->should_coerce; |
4e757c98 |
72 | |
85ccd3e9 |
73 | my $self = '$_[0]'; |
85ccd3e9 |
74 | my $key = $attribute->inlined_name; |
c3398f5b |
75 | |
85ccd3e9 |
76 | my $accessor = "sub {\n"; |
2434d21b |
77 | if ($attribute->_is_metadata eq 'rw') { |
d8b10b32 |
78 | $accessor .= 'if (@_ >= 2) {' . "\n"; |
7de13475 |
79 | |
80 | my $value = '$_[1]'; |
a707f587 |
81 | |
a08e715f |
82 | if ($constraint) { |
eec1bb49 |
83 | $accessor .= 'my $val = '; |
32af3489 |
84 | if ($should_coerce) { |
3b46bd49 |
85 | $accessor .= 'Mouse::Util::TypeConstraints->typecast_constraints("'.$attribute->associated_class->name.'", $attribute->{find_type_constraint}, $attribute->{type_constraint}, '.$value.');'; |
eec1bb49 |
86 | } else { |
87 | $accessor .= $value.';'; |
4188b837 |
88 | } |
4188b837 |
89 | $accessor .= ' |
c91d12e0 |
90 | unless ($constraint->($val)) { |
91 | $attribute->verify_type_constraint_error($name, $val, $attribute->type_constraint); |
b3b74cc6 |
92 | }' . "\n"; |
eec1bb49 |
93 | $value = '$val'; |
a707f587 |
94 | } |
95 | |
ccd73de7 |
96 | # if there's nothing left to do for the attribute we can return during |
97 | # this setter |
98 | $accessor .= 'return ' if !$is_weak && !$trigger && !$should_deref; |
c3398f5b |
99 | |
2b9094e8 |
100 | $accessor .= $self.'->{'.$key.'} = '.$value.';' . "\n"; |
101 | |
ccd73de7 |
102 | if ($is_weak) { |
6c169c50 |
103 | $accessor .= 'Scalar::Util::weaken('.$self.'->{'.$key.'}) if ref('.$self.'->{'.$key.'});' . "\n"; |
c3398f5b |
104 | } |
105 | |
a08e715f |
106 | if ($trigger) { |
88b6c018 |
107 | $accessor .= '$trigger->('.$self.', '.$value.');' . "\n"; |
c3398f5b |
108 | } |
109 | |
85ccd3e9 |
110 | $accessor .= "}\n"; |
c3398f5b |
111 | } |
112 | else { |
85ccd3e9 |
113 | $accessor .= 'confess "Cannot assign a value to a read-only accessor" if scalar(@_) >= 2;' . "\n"; |
c3398f5b |
114 | } |
115 | |
3aadb773 |
116 | if ($attribute->is_lazy) { |
85ccd3e9 |
117 | $accessor .= $self.'->{'.$key.'} = '; |
9367e029 |
118 | |
119 | $accessor .= $attribute->has_builder |
85ccd3e9 |
120 | ? $self.'->$builder' |
121 | : ref($default) eq 'CODE' |
122 | ? '$default->('.$self.')' |
123 | : '$default'; |
124 | $accessor .= ' if !exists '.$self.'->{'.$key.'};' . "\n"; |
c3398f5b |
125 | } |
126 | |
ccd73de7 |
127 | if ($should_deref) { |
eec1bb49 |
128 | my $type_constraint = $attribute->type_constraint; |
129 | if (!ref($type_constraint) && $type_constraint eq 'ArrayRef') { |
3cf68001 |
130 | $accessor .= 'if (wantarray) { |
85ccd3e9 |
131 | return @{ '.$self.'->{'.$key.'} || [] }; |
7de13475 |
132 | }'; |
3cf68001 |
133 | } |
134 | else { |
135 | $accessor .= 'if (wantarray) { |
85ccd3e9 |
136 | return %{ '.$self.'->{'.$key.'} || {} }; |
7de13475 |
137 | }'; |
3cf68001 |
138 | } |
139 | } |
140 | |
85ccd3e9 |
141 | $accessor .= 'return '.$self.'->{'.$key.'}; |
c3398f5b |
142 | }'; |
143 | |
71b948d1 |
144 | my $sub = eval $accessor; |
145 | confess $@ if $@; |
146 | return $sub; |
c3398f5b |
147 | } |
148 | |
149 | sub generate_predicate { |
150 | my $attribute = shift; |
d10fd510 |
151 | my $key = $attribute->inlined_name; |
c3398f5b |
152 | |
d10fd510 |
153 | my $predicate = 'sub { exists($_[0]->{'.$key.'}) }'; |
c3398f5b |
154 | |
71b948d1 |
155 | my $sub = eval $predicate; |
156 | confess $@ if $@; |
157 | return $sub; |
c3398f5b |
158 | } |
159 | |
160 | sub generate_clearer { |
161 | my $attribute = shift; |
d10fd510 |
162 | my $key = $attribute->inlined_name; |
c3398f5b |
163 | |
d10fd510 |
164 | my $clearer = 'sub { delete($_[0]->{'.$key.'}) }'; |
c3398f5b |
165 | |
71b948d1 |
166 | my $sub = eval $clearer; |
167 | confess $@ if $@; |
168 | return $sub; |
c3398f5b |
169 | } |
170 | |
171 | sub generate_handles { |
172 | my $attribute = shift; |
2434d21b |
173 | my $reader = $attribute->name; |
c3cc3642 |
174 | my %handles = $attribute->_canonicalize_handles($attribute->handles); |
c3398f5b |
175 | |
176 | my %method_map; |
177 | |
c3cc3642 |
178 | for my $local_method (keys %handles) { |
179 | my $remote_method = $handles{$local_method}; |
c3398f5b |
180 | |
181 | my $method = 'sub { |
182 | my $self = shift; |
0ecefe82 |
183 | $self->'.$reader.'->'.$remote_method.'(@_) |
c3398f5b |
184 | }'; |
185 | |
186 | $method_map{$local_method} = eval $method; |
71b948d1 |
187 | confess $@ if $@; |
c3398f5b |
188 | } |
189 | |
190 | return \%method_map; |
191 | } |
192 | |
1f7ac337 |
193 | my $optimized_constraints; |
315b97c2 |
194 | sub _build_type_constraint { |
195 | my $spec = shift; |
1f7ac337 |
196 | $optimized_constraints ||= Mouse::Util::TypeConstraints->optimized_constraints; |
315b97c2 |
197 | my $code; |
198 | if ($spec =~ /^([^\[]+)\[(.+)\]$/) { |
199 | # parameterized |
200 | my $constraint = $1; |
201 | my $param = $2; |
a510e63c |
202 | my $parent; |
203 | if ($constraint eq 'Maybe') { |
204 | $parent = _build_type_constraint('Undef'); |
205 | } else { |
206 | $parent = _build_type_constraint($constraint); |
207 | } |
208 | my $child = _build_type_constraint($param); |
315b97c2 |
209 | if ($constraint eq 'ArrayRef') { |
210 | my $code_str = |
211 | "sub {\n" . |
212 | " if (\$parent->(\$_)) {\n" . |
213 | " foreach my \$e (@\$_) {\n" . |
214 | " local \$_ = \$e;\n" . |
215 | " return () unless \$child->(\$_);\n" . |
216 | " }\n" . |
217 | " return 1;\n" . |
218 | " }\n" . |
219 | " return ();\n" . |
220 | "};\n" |
221 | ; |
222 | $code = eval $code_str or Carp::confess($@); |
223 | } elsif ($constraint eq 'HashRef') { |
224 | my $code_str = |
225 | "sub {\n" . |
226 | " if (\$parent->(\$_)) {\n" . |
227 | " foreach my \$e (values %\$_) {\n" . |
228 | " local \$_ = \$e;\n" . |
229 | " return () unless \$child->(\$_);\n" . |
230 | " }\n" . |
231 | " return 1;\n" . |
232 | " }\n" . |
233 | " return ();\n" . |
234 | "};\n" |
235 | ; |
236 | $code = eval $code_str or Carp::confess($@); |
a510e63c |
237 | } elsif ($constraint eq 'Maybe') { |
238 | my $code_str = |
239 | "sub {\n" . |
240 | " return \$child->(\$_) || \$parent->(\$_);\n" . |
241 | "};\n" |
242 | ; |
243 | $code = eval $code_str or Carp::confess($@); |
315b97c2 |
244 | } else { |
245 | Carp::confess("Support for parameterized types other than ArrayRef or HashRef is not implemented yet"); |
246 | } |
1f7ac337 |
247 | $optimized_constraints->{$spec} = $code; |
315b97c2 |
248 | } else { |
249 | $code = $optimized_constraints->{ $spec }; |
250 | if (! $code) { |
c91d12e0 |
251 | $code = sub { Scalar::Util::blessed($_[0]) && $_[0]->isa($spec) }; |
315b97c2 |
252 | $optimized_constraints->{$spec} = $code; |
253 | } |
254 | } |
255 | return $code; |
256 | } |
257 | |
c3398f5b |
258 | sub create { |
259 | my ($self, $class, $name, %args) = @_; |
260 | |
1bfebf5f |
261 | $args{name} = $name; |
181502b9 |
262 | $args{associated_class} = $class; |
1bfebf5f |
263 | |
93d190e0 |
264 | %args = $self->canonicalize_args($name, %args); |
1bbaa8ed |
265 | $self->validate_args($name, \%args); |
45ea8620 |
266 | |
32af3489 |
267 | $args{should_coerce} = delete $args{coerce} |
4188b837 |
268 | if exists $args{coerce}; |
269 | |
eec1bb49 |
270 | if (exists $args{isa}) { |
c1c94293 |
271 | confess "Got isa => $args{isa}, but Mouse does not yet support parameterized types for containers other than ArrayRef and HashRef (rt.cpan.org #39795)" |
315b97c2 |
272 | if $args{isa} =~ /^([^\[]+)\[.+\]$/ && |
273 | $1 ne 'ArrayRef' && |
a510e63c |
274 | $1 ne 'HashRef' && |
275 | $1 ne 'Maybe' |
276 | ; |
5fa003bf |
277 | |
eec1bb49 |
278 | my $type_constraint = delete $args{isa}; |
279 | $type_constraint =~ s/\s//g; |
280 | my @type_constraints = split /\|/, $type_constraint; |
281 | |
282 | my $code; |
eec1bb49 |
283 | if (@type_constraints == 1) { |
315b97c2 |
284 | $code = _build_type_constraint($type_constraints[0]); |
eec1bb49 |
285 | $args{type_constraint} = $type_constraints[0]; |
286 | } else { |
287 | my @code_list = map { |
315b97c2 |
288 | _build_type_constraint($_) |
eec1bb49 |
289 | } @type_constraints; |
290 | $code = sub { |
c91d12e0 |
291 | local $_ = $_[0]; |
eec1bb49 |
292 | for my $code (@code_list) { |
c91d12e0 |
293 | return 1 if $code->($_); |
eec1bb49 |
294 | } |
295 | return 0; |
296 | }; |
297 | $args{type_constraint} = \@type_constraints; |
298 | } |
299 | $args{find_type_constraint} = $code; |
300 | } |
186657a9 |
301 | |
2608b115 |
302 | my $attribute = $self->new($name, %args); |
1bfebf5f |
303 | |
724c77c0 |
304 | $attribute->_create_args(\%args); |
c3398f5b |
305 | |
724c77c0 |
306 | $class->add_attribute($attribute); |
b2500191 |
307 | |
c3398f5b |
308 | # install an accessor |
2434d21b |
309 | if ($attribute->_is_metadata eq 'rw' || $attribute->_is_metadata eq 'ro') { |
c3398f5b |
310 | my $accessor = $attribute->generate_accessor; |
724c77c0 |
311 | $class->add_method($name => $accessor); |
c3398f5b |
312 | } |
313 | |
c3398f5b |
314 | for my $method (qw/predicate clearer/) { |
2434d21b |
315 | my $predicate = "has_$method"; |
316 | if ($attribute->$predicate) { |
c3398f5b |
317 | my $generator = "generate_$method"; |
318 | my $coderef = $attribute->$generator; |
724c77c0 |
319 | $class->add_method($attribute->$method => $coderef); |
c3398f5b |
320 | } |
321 | } |
322 | |
2434d21b |
323 | if ($attribute->has_handles) { |
c3398f5b |
324 | my $method_map = $attribute->generate_handles; |
325 | for my $method_name (keys %$method_map) { |
724c77c0 |
326 | $class->add_method($method_name => $method_map->{$method_name}); |
c3398f5b |
327 | } |
328 | } |
329 | |
330 | return $attribute; |
331 | } |
332 | |
93d190e0 |
333 | sub canonicalize_args { |
334 | my $self = shift; |
335 | my $name = shift; |
336 | my %args = @_; |
337 | |
338 | if ($args{lazy_build}) { |
339 | $args{lazy} = 1; |
340 | $args{required} = 1; |
341 | $args{builder} = "_build_${name}" |
342 | if !exists($args{builder}); |
343 | if ($name =~ /^_/) { |
344 | $args{clearer} = "_clear${name}" if !exists($args{clearer}); |
345 | $args{predicate} = "_has${name}" if !exists($args{predicate}); |
346 | } |
347 | else { |
348 | $args{clearer} = "clear_${name}" if !exists($args{clearer}); |
349 | $args{predicate} = "has_${name}" if !exists($args{predicate}); |
350 | } |
351 | } |
352 | |
353 | return %args; |
354 | } |
355 | |
8fd9e611 |
356 | sub validate_args { |
357 | my $self = shift; |
358 | my $name = shift; |
1bbaa8ed |
359 | my $args = shift; |
8fd9e611 |
360 | |
93d190e0 |
361 | confess "You can not use lazy_build and default for the same attribute ($name)" |
1bbaa8ed |
362 | if $args->{lazy_build} && exists $args->{default}; |
93d190e0 |
363 | |
8fd9e611 |
364 | confess "You cannot have lazy attribute ($name) without specifying a default value for it" |
1bbaa8ed |
365 | if $args->{lazy} |
366 | && !exists($args->{default}) |
367 | && !exists($args->{builder}); |
8fd9e611 |
368 | |
369 | confess "References are not allowed as default values, you must wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])" |
1bbaa8ed |
370 | if ref($args->{default}) |
371 | && ref($args->{default}) ne 'CODE'; |
8fd9e611 |
372 | |
97661b77 |
373 | confess "You cannot auto-dereference without specifying a type constraint on attribute ($name)" |
1bbaa8ed |
374 | if $args->{auto_deref} && !exists($args->{isa}); |
8fd9e611 |
375 | |
97661b77 |
376 | confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)" |
1bbaa8ed |
377 | if $args->{auto_deref} |
378 | && $args->{isa} ne 'ArrayRef' |
379 | && $args->{isa} ne 'HashRef'; |
8fd9e611 |
380 | |
506db557 |
381 | if ($args->{trigger}) { |
a08e715f |
382 | if (ref($args->{trigger}) eq 'HASH') { |
383 | Carp::carp "HASH-based form of trigger has been removed. Only the coderef form of triggers are now supported."; |
844fa049 |
384 | } |
506db557 |
385 | |
844fa049 |
386 | confess "Trigger must be a CODE ref on attribute ($name)" |
a08e715f |
387 | if ref($args->{trigger}) ne 'CODE'; |
506db557 |
388 | } |
6c5498d0 |
389 | |
8fd9e611 |
390 | return 1; |
391 | } |
392 | |
20e25eb9 |
393 | sub verify_against_type_constraint { |
8a7f2a8a |
394 | return 1 unless $_[0]->{type_constraint}; |
5aa30ced |
395 | |
8a7f2a8a |
396 | local $_ = $_[1]; |
397 | return 1 if $_[0]->{find_type_constraint}->($_); |
5aa30ced |
398 | |
8a7f2a8a |
399 | my $self = shift; |
b3b74cc6 |
400 | $self->verify_type_constraint_error($self->name, $_, $self->type_constraint); |
401 | } |
5aa30ced |
402 | |
b3b74cc6 |
403 | sub verify_type_constraint_error { |
404 | my($self, $name, $value, $type) = @_; |
405 | $type = ref($type) eq 'ARRAY' ? join '|', @{ $type } : $type; |
c91d12e0 |
406 | my $display = defined($value) ? overload::StrVal($value) : 'undef'; |
f3e05dfd |
407 | Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display"); |
5aa30ced |
408 | } |
409 | |
8a7f2a8a |
410 | sub coerce_constraint { ## my($self, $value) = @_; |
411 | my $type = $_[0]->{type_constraint} |
412 | or return $_[1]; |
3b46bd49 |
413 | return Mouse::Util::TypeConstraints->typecast_constraints($_[0]->associated_class->name, $_[0]->find_type_constraint, $type, $_[1]); |
4188b837 |
414 | } |
415 | |
af745d5a |
416 | sub _canonicalize_handles { |
417 | my $self = shift; |
418 | my $handles = shift; |
419 | |
420 | if (ref($handles) eq 'HASH') { |
421 | return %$handles; |
422 | } |
423 | elsif (ref($handles) eq 'ARRAY') { |
424 | return map { $_ => $_ } @$handles; |
425 | } |
426 | else { |
427 | confess "Unable to canonicalize the 'handles' option with $handles"; |
428 | } |
429 | } |
430 | |
1bfebf5f |
431 | sub clone_parent { |
432 | my $self = shift; |
433 | my $class = shift; |
434 | my $name = shift; |
435 | my %args = ($self->get_parent_args($class, $name), @_); |
436 | |
437 | $self->create($class, $name, %args); |
438 | } |
439 | |
440 | sub get_parent_args { |
441 | my $self = shift; |
442 | my $class = shift; |
443 | my $name = shift; |
444 | |
724c77c0 |
445 | for my $super ($class->linearized_isa) { |
bb733405 |
446 | my $super_attr = $super->can("meta") && $super->meta->get_attribute($name) |
1bfebf5f |
447 | or next; |
448 | return %{ $super_attr->_create_args }; |
449 | } |
450 | |
451 | confess "Could not find an attribute by the name of '$name' to inherit from"; |
452 | } |
453 | |
c3398f5b |
454 | 1; |
455 | |
456 | __END__ |
457 | |
458 | =head1 NAME |
459 | |
306290e8 |
460 | Mouse::Meta::Attribute - attribute metaclass |
c3398f5b |
461 | |
462 | =head1 METHODS |
463 | |
306290e8 |
464 | =head2 new %args -> Mouse::Meta::Attribute |
c3398f5b |
465 | |
306290e8 |
466 | Instantiates a new Mouse::Meta::Attribute. Does nothing else. |
c3398f5b |
467 | |
306290e8 |
468 | =head2 create OwnerClass, AttributeName, %args -> Mouse::Meta::Attribute |
c3398f5b |
469 | |
470 | Creates a new attribute in OwnerClass. Accessors and helper methods are |
471 | installed. Some error checking is done. |
472 | |
473 | =head2 name -> AttributeName |
474 | |
181502b9 |
475 | =head2 associated_class -> OwnerClass |
c3398f5b |
476 | |
ab27a55e |
477 | =head2 is_required -> Bool |
c3398f5b |
478 | |
ab27a55e |
479 | =head2 default -> Item |
c3398f5b |
480 | |
ab27a55e |
481 | =head2 has_default -> Bool |
482 | |
483 | =head2 is_lazy -> Bool |
484 | |
485 | =head2 predicate -> MethodName | Undef |
486 | |
487 | =head2 has_predicate -> Bool |
488 | |
489 | =head2 clearer -> MethodName | Undef |
490 | |
491 | =head2 has_clearer -> Bool |
c3398f5b |
492 | |
493 | =head2 handles -> { LocalName => RemoteName } |
494 | |
ab27a55e |
495 | =head2 has_handles -> Bool |
496 | |
3645b316 |
497 | =head2 is_weak_ref -> Bool |
c3398f5b |
498 | |
499 | =head2 init_arg -> Str |
500 | |
ab27a55e |
501 | =head2 type_constraint -> Str |
502 | |
503 | =head2 has_type_constraint -> Bool |
504 | |
505 | =head2 trigger => CODE | Undef |
506 | |
507 | =head2 has_trigger -> Bool |
508 | |
509 | =head2 builder => MethodName | Undef |
510 | |
511 | =head2 has_builder -> Bool |
512 | |
93f08899 |
513 | =head2 is_lazy_build => Bool |
514 | |
0fff36e6 |
515 | =head2 should_auto_deref -> Bool |
516 | |
c3398f5b |
517 | Informational methods. |
518 | |
519 | =head2 generate_accessor -> CODE |
520 | |
521 | Creates a new code reference for the attribute's accessor. |
522 | |
523 | =head2 generate_predicate -> CODE |
524 | |
525 | Creates a new code reference for the attribute's predicate. |
526 | |
527 | =head2 generate_clearer -> CODE |
528 | |
529 | Creates a new code reference for the attribute's clearer. |
530 | |
531 | =head2 generate_handles -> { MethodName => CODE } |
532 | |
533 | Creates a new code reference for each of the attribute's handles methods. |
534 | |
fb706f5c |
535 | =head2 find_type_constraint -> CODE |
536 | |
537 | Returns a code reference which can be used to check that a given value passes |
538 | this attribute's type constraint; |
539 | |
20e25eb9 |
540 | =head2 verify_against_type_constraint Item -> 1 | ERROR |
fb706f5c |
541 | |
542 | Checks that the given value passes this attribute's type constraint. Returns 1 |
543 | on success, otherwise C<confess>es. |
544 | |
93d190e0 |
545 | =head2 canonicalize_args Name, %args -> %args |
546 | |
547 | Canonicalizes some arguments to create. In particular, C<lazy_build> is |
548 | canonicalized into C<lazy>, C<builder>, etc. |
549 | |
1bbaa8ed |
550 | =head2 validate_args Name, \%args -> 1 | ERROR |
93d190e0 |
551 | |
552 | Checks that the arguments to create the attribute (ie those specified by |
553 | C<has>) are valid. |
554 | |
f7b11a21 |
555 | =head2 clone_parent OwnerClass, AttributeName, %args -> Mouse::Meta::Attribute |
556 | |
557 | Creates a new attribute in OwnerClass, inheriting options from parent classes. |
558 | Accessors and helper methods are installed. Some error checking is done. |
559 | |
560 | =head2 get_parent_args OwnerClass, AttributeName -> Hash |
561 | |
562 | Returns the options that the parent class of C<OwnerClass> used for attribute |
563 | C<AttributeName>. |
564 | |
c3398f5b |
565 | =cut |
566 | |