Commit | Line | Data |
3b46bd49 |
1 | package Mouse::Util::TypeConstraints; |
d60c78b9 |
2 | use strict; |
3 | use warnings; |
f3bb863f |
4 | |
5 | use Exporter; |
9baf5d6b |
6 | |
61a02a3a |
7 | use Carp (); |
6c169c50 |
8 | use Scalar::Util qw/blessed looks_like_number openhandle/; |
6d28c5cf |
9 | |
2efc0af1 |
10 | use Mouse::Util qw(does_role not_supported); |
a497c7d3 |
11 | use Mouse::Meta::Module; # class_of |
684db121 |
12 | use Mouse::Meta::TypeConstraint; |
d60c78b9 |
13 | |
f3bb863f |
14 | our @ISA = qw(Exporter); |
139d92d2 |
15 | our @EXPORT = qw( |
d44f0d03 |
16 | as where message from via type subtype coerce class_type role_type enum |
ccf44227 |
17 | find_type_constraint |
139d92d2 |
18 | ); |
19 | |
cceb0e25 |
20 | my %TYPE; |
7dbebb1b |
21 | my %TYPE_SOURCE; |
8a7f2a8a |
22 | my %COERCE; |
23 | my %COERCE_KEYS; |
4188b837 |
24 | |
139d92d2 |
25 | sub as ($) { |
cd2b9201 |
26 | return(as => $_[0]); |
61a02a3a |
27 | } |
139d92d2 |
28 | sub where (&) { |
cd2b9201 |
29 | return(where => $_[0]) |
61a02a3a |
30 | } |
0f1dae9a |
31 | sub message (&) { |
cd2b9201 |
32 | return(message => $_[0]) |
61a02a3a |
33 | } |
34 | |
73766a27 |
35 | sub from { @_ } |
cd2b9201 |
36 | sub via (&) { $_[0] } |
61a02a3a |
37 | |
321e5271 |
38 | BEGIN { |
993e62a7 |
39 | my %builtins = ( |
381f326a |
40 | Any => sub { 1 }, |
41 | Item => sub { 1 }, |
73766a27 |
42 | |
43 | Bool => sub { $_[0] ? $_[0] eq '1' : 1 }, |
c91d12e0 |
44 | Undef => sub { !defined($_[0]) }, |
45 | Defined => sub { defined($_[0]) }, |
46 | Value => sub { defined($_[0]) && !ref($_[0]) }, |
47 | Num => sub { !ref($_[0]) && looks_like_number($_[0]) }, |
48 | Int => sub { defined($_[0]) && !ref($_[0]) && $_[0] =~ /^-?[0-9]+$/ }, |
49 | Str => sub { defined($_[0]) && !ref($_[0]) }, |
c91d12e0 |
50 | Ref => sub { ref($_[0]) }, |
51 | |
52 | ScalarRef => sub { ref($_[0]) eq 'SCALAR' }, |
53 | ArrayRef => sub { ref($_[0]) eq 'ARRAY' }, |
54 | HashRef => sub { ref($_[0]) eq 'HASH' }, |
55 | CodeRef => sub { ref($_[0]) eq 'CODE' }, |
56 | RegexpRef => sub { ref($_[0]) eq 'Regexp' }, |
57 | GlobRef => sub { ref($_[0]) eq 'GLOB' }, |
381f326a |
58 | |
59 | FileHandle => sub { |
c91d12e0 |
60 | ref($_[0]) eq 'GLOB' && openhandle($_[0]) |
381f326a |
61 | or |
c91d12e0 |
62 | blessed($_[0]) && $_[0]->isa("IO::Handle") |
abe4e887 |
63 | }, |
381f326a |
64 | |
c91d12e0 |
65 | Object => sub { blessed($_[0]) && blessed($_[0]) ne 'Regexp' }, |
73766a27 |
66 | |
67 | ClassName => sub { Mouse::Util::is_class_loaded($_[0]) }, |
d4571def |
68 | RoleName => sub { (Mouse::Util::find_meta($_[0]) || return 0)->isa('Mouse::Meta::Role') }, |
8a7f2a8a |
69 | ); |
993e62a7 |
70 | |
71 | while (my ($name, $code) = each %builtins) { |
73766a27 |
72 | $TYPE{$name} = Mouse::Meta::TypeConstraint->new( |
73 | name => $name, |
74 | _compiled_type_constraint => $code, |
75 | ); |
d4571def |
76 | $TYPE_SOURCE{$name} = __PACKAGE__; |
78b13827 |
77 | } |
d3982c7e |
78 | |
cceb0e25 |
79 | sub optimized_constraints { \%TYPE } |
d4571def |
80 | |
993e62a7 |
81 | my @builtins = keys %TYPE; |
82 | sub list_all_builtin_type_constraints { @builtins } |
83 | |
84 | sub list_all_type_constraints { keys %TYPE } |
381f326a |
85 | } |
d3982c7e |
86 | |
139d92d2 |
87 | sub type { |
73766a27 |
88 | my $name; |
89 | my %conf; |
90 | |
91 | if(@_ == 1 && ref $_[0]){ # type { where => ... } |
92 | %conf = %{$_[0]}; |
93 | } |
94 | elsif(@_ == 2 && ref $_[1]){ # type $name => { where => ... }* |
95 | $name = $_[0]; |
96 | %conf = %{$_[1]}; |
97 | } |
98 | elsif(@_ % 2){ # odd number of arguments |
99 | $name = shift; |
100 | %conf = @_; |
101 | } |
102 | else{ |
103 | %conf = @_; |
104 | } |
105 | |
106 | $name = '__ANON__' if !defined $name; |
107 | |
108 | my $pkg = caller; |
cd2b9201 |
109 | |
0d062abb |
110 | if ($TYPE{$name} && $TYPE_SOURCE{$name} ne $pkg) { |
7dbebb1b |
111 | Carp::croak "The type constraint '$name' has already been created in $TYPE_SOURCE{$name} and cannot be created again in $pkg"; |
cd2b9201 |
112 | } |
d4571def |
113 | |
321e5271 |
114 | my $constraint = $conf{where} || do { |
115 | my $as = delete $conf{as} || 'Any'; |
d4571def |
116 | ($TYPE{$as} ||= _build_type_constraint($as))->{_compiled_type_constraint}; |
321e5271 |
117 | }; |
7dbebb1b |
118 | |
d4571def |
119 | my $tc = Mouse::Meta::TypeConstraint->new( |
120 | name => $name, |
684db121 |
121 | _compiled_type_constraint => sub { |
122 | local $_ = $_[0]; |
d4571def |
123 | return &{$constraint}; |
124 | }, |
684db121 |
125 | ); |
d4571def |
126 | |
127 | $TYPE_SOURCE{$name} = $pkg; |
128 | $TYPE{$name} = $tc; |
129 | |
130 | return $tc; |
0d9fea22 |
131 | } |
132 | |
139d92d2 |
133 | sub subtype { |
7a50b450 |
134 | my $name; |
135 | my %conf; |
136 | |
73766a27 |
137 | if(@_ == 1 && ref $_[0]){ # type { where => ... } |
138 | %conf = %{$_[0]}; |
139 | } |
140 | elsif(@_ == 2 && ref $_[1]){ # type $name => { where => ... }* |
141 | $name = $_[0]; |
142 | %conf = %{$_[1]}; |
143 | } |
144 | elsif(@_ % 2){ # odd number of arguments |
7a50b450 |
145 | $name = shift; |
146 | %conf = @_; |
147 | } |
148 | else{ |
149 | %conf = @_; |
7a50b450 |
150 | } |
151 | |
73766a27 |
152 | $name = '__ANON__' if !defined $name; |
153 | |
154 | my $pkg = caller; |
155 | |
0d062abb |
156 | if ($TYPE{$name} && $TYPE_SOURCE{$name} ne $pkg) { |
7dbebb1b |
157 | Carp::croak "The type constraint '$name' has already been created in $TYPE_SOURCE{$name} and cannot be created again in $pkg"; |
73766a27 |
158 | } |
7dbebb1b |
159 | |
d4571def |
160 | my $constraint = delete $conf{where}; |
161 | my $as_constraint = find_or_create_isa_type_constraint(delete $conf{as} || 'Any') |
162 | ->{_compiled_type_constraint}; |
163 | |
164 | my $tc = Mouse::Meta::TypeConstraint->new( |
684db121 |
165 | name => $name, |
166 | _compiled_type_constraint => ( |
167 | $constraint ? |
168 | sub { |
169 | local $_ = $_[0]; |
d4571def |
170 | $as_constraint->($_[0]) && $constraint->($_[0]) |
684db121 |
171 | } : |
172 | sub { |
173 | local $_ = $_[0]; |
d4571def |
174 | $as_constraint->($_[0]); |
684db121 |
175 | } |
176 | ), |
d4571def |
177 | %conf, |
684db121 |
178 | ); |
7dbebb1b |
179 | |
d4571def |
180 | $TYPE_SOURCE{$name} = $pkg; |
181 | $TYPE{$name} = $tc; |
182 | |
183 | return $tc; |
4188b837 |
184 | } |
185 | |
139d92d2 |
186 | sub coerce { |
cd2b9201 |
187 | my $name = shift; |
61a02a3a |
188 | |
189 | Carp::croak "Cannot find type '$name', perhaps you forgot to load it." |
cceb0e25 |
190 | unless $TYPE{$name}; |
61a02a3a |
191 | |
8a7f2a8a |
192 | unless ($COERCE{$name}) { |
193 | $COERCE{$name} = {}; |
194 | $COERCE_KEYS{$name} = []; |
195 | } |
cd2b9201 |
196 | |
197 | while (my($type, $code) = splice @_, 0, 2) { |
61a02a3a |
198 | Carp::croak "A coercion action already exists for '$type'" |
8a7f2a8a |
199 | if $COERCE{$name}->{$type}; |
61a02a3a |
200 | |
310ad28b |
201 | if (! $TYPE{$type}) { |
202 | # looks parameterized |
203 | if ($type =~ /^[^\[]+\[.+\]$/) { |
94593ae8 |
204 | $TYPE{$type} = _build_type_constraint($type); |
310ad28b |
205 | } else { |
206 | Carp::croak "Could not find the type constraint ($type) to coerce from" |
207 | } |
208 | } |
61a02a3a |
209 | |
cd2b9201 |
210 | push @{ $COERCE_KEYS{$name} }, $type; |
8a7f2a8a |
211 | $COERCE{$name}->{$type} = $code; |
61a02a3a |
212 | } |
cd2b9201 |
213 | return; |
4188b837 |
214 | } |
215 | |
139d92d2 |
216 | sub class_type { |
ecc6e3b1 |
217 | my($name, $conf) = @_; |
d9f8c878 |
218 | if ($conf && $conf->{class}) { |
219 | # No, you're using this wrong |
220 | warn "class_type() should be class_type(ClassName). Perhaps you're looking for subtype $name => as '$conf->{class}'?"; |
2efc0af1 |
221 | subtype $name => (as => $conf->{class}); |
a497c7d3 |
222 | } |
223 | else { |
224 | subtype $name => ( |
225 | where => sub { blessed($_) && $_->isa($name) }, |
d9f8c878 |
226 | ); |
227 | } |
ecc6e3b1 |
228 | } |
229 | |
139d92d2 |
230 | sub role_type { |
47f36c05 |
231 | my($name, $conf) = @_; |
232 | my $role = $conf->{role}; |
a497c7d3 |
233 | subtype $name => ( |
2efc0af1 |
234 | where => sub { does_role($_, $role) }, |
61a02a3a |
235 | ); |
47f36c05 |
236 | } |
237 | |
684db121 |
238 | # this is an original method for Mouse |
4188b837 |
239 | sub typecast_constraints { |
684db121 |
240 | my($class, $pkg, $types, $value) = @_; |
2efc0af1 |
241 | Carp::croak("wrong arguments count") unless @_ == 4; |
eec1bb49 |
242 | |
b3b74cc6 |
243 | local $_; |
684db121 |
244 | for my $type ( split /\|/, $types ) { |
8a7f2a8a |
245 | next unless $COERCE{$type}; |
8a7f2a8a |
246 | for my $coerce_type (@{ $COERCE_KEYS{$type}}) { |
b3b74cc6 |
247 | $_ = $value; |
684db121 |
248 | next unless $TYPE{$coerce_type}->check($value); |
b3b74cc6 |
249 | $_ = $value; |
c91d12e0 |
250 | $_ = $COERCE{$type}->{$coerce_type}->($value); |
684db121 |
251 | return $_ if $types->check($_); |
4188b837 |
252 | } |
253 | } |
4188b837 |
254 | return $value; |
255 | } |
256 | |
01904723 |
257 | my $serial_enum = 0; |
d44f0d03 |
258 | sub enum { |
01904723 |
259 | # enum ['small', 'medium', 'large'] |
260 | if (ref($_[0]) eq 'ARRAY') { |
261 | my @elements = @{ shift @_ }; |
262 | |
263 | my $name = 'Mouse::Util::TypeConstaints::Enum::Serial::' |
264 | . ++$serial_enum; |
265 | enum($name, @elements); |
266 | return $name; |
267 | } |
268 | |
269 | # enum size => 'small', 'medium', 'large' |
d44f0d03 |
270 | my $name = shift; |
271 | my %is_valid = map { $_ => 1 } @_; |
272 | |
273 | subtype( |
274 | $name => where => sub { $is_valid{$_} } |
275 | ); |
276 | } |
277 | |
321e5271 |
278 | sub _build_type_constraint { |
2efc0af1 |
279 | my($spec) = @_; |
321e5271 |
280 | |
321e5271 |
281 | my $code; |
94593ae8 |
282 | $spec =~ s/\s+//g; |
2efc0af1 |
283 | |
284 | if ($spec =~ /\A (\w+) \[ (.+) \] \z/xms) { |
321e5271 |
285 | # parameterized |
286 | my $constraint = $1; |
287 | my $param = $2; |
288 | my $parent; |
2efc0af1 |
289 | |
321e5271 |
290 | if ($constraint eq 'Maybe') { |
291 | $parent = _build_type_constraint('Undef'); |
2efc0af1 |
292 | } |
293 | else { |
321e5271 |
294 | $parent = _build_type_constraint($constraint); |
295 | } |
296 | my $child = _build_type_constraint($param); |
297 | if ($constraint eq 'ArrayRef') { |
298 | my $code_str = |
299 | "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" . |
300 | "sub {\n" . |
684db121 |
301 | " if (\$parent->check(\$_[0])) {\n" . |
321e5271 |
302 | " foreach my \$e (\@{\$_[0]}) {\n" . |
684db121 |
303 | " return () unless \$child->check(\$e);\n" . |
321e5271 |
304 | " }\n" . |
305 | " return 1;\n" . |
306 | " }\n" . |
307 | " return ();\n" . |
308 | "};\n" |
309 | ; |
310 | $code = eval $code_str or Carp::confess("Failed to generate inline type constraint: $@"); |
311 | } elsif ($constraint eq 'HashRef') { |
312 | my $code_str = |
313 | "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" . |
314 | "sub {\n" . |
684db121 |
315 | " if (\$parent->check(\$_[0])) {\n" . |
321e5271 |
316 | " foreach my \$e (values \%{\$_[0]}) {\n" . |
684db121 |
317 | " return () unless \$child->check(\$e);\n" . |
321e5271 |
318 | " }\n" . |
319 | " return 1;\n" . |
320 | " }\n" . |
321 | " return ();\n" . |
322 | "};\n" |
323 | ; |
324 | $code = eval $code_str or Carp::confess($@); |
325 | } elsif ($constraint eq 'Maybe') { |
326 | my $code_str = |
327 | "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" . |
328 | "sub {\n" . |
684db121 |
329 | " return \$child->check(\$_[0]) || \$parent->check(\$_[0]);\n" . |
321e5271 |
330 | "};\n" |
331 | ; |
332 | $code = eval $code_str or Carp::confess($@); |
333 | } else { |
766534c2 |
334 | Carp::confess("Support for parameterized types other than Maybe, ArrayRef or HashRef is not implemented yet"); |
321e5271 |
335 | } |
684db121 |
336 | $TYPE{$spec} = Mouse::Meta::TypeConstraint->new( _compiled_type_constraint => $code, name => $spec ); |
321e5271 |
337 | } else { |
338 | $code = $TYPE{ $spec }; |
339 | if (! $code) { |
5c5a61e0 |
340 | # is $spec a known role? If so, constrain with 'does' instead of 'isa' |
341 | require Mouse::Meta::Role; |
342 | my $check = Mouse::Meta::Role->_metaclass_cache($spec)? |
343 | 'does' : 'isa'; |
321e5271 |
344 | my $code_str = |
345 | "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" . |
346 | "sub {\n" . |
5c5a61e0 |
347 | " Scalar::Util::blessed(\$_[0]) && \$_[0]->$check('$spec');\n" . |
321e5271 |
348 | "}" |
349 | ; |
350 | $code = eval $code_str or Carp::confess($@); |
684db121 |
351 | $TYPE{$spec} = Mouse::Meta::TypeConstraint->new( _compiled_type_constraint => $code, name => $spec ); |
321e5271 |
352 | } |
353 | } |
684db121 |
354 | return Mouse::Meta::TypeConstraint->new( _compiled_type_constraint => $code, name => $spec ); |
321e5271 |
355 | } |
356 | |
357 | sub find_type_constraint { |
993e62a7 |
358 | my($type) = @_; |
359 | if(blessed($type) && $type->isa('Mouse::Meta::TypeConstraint')){ |
360 | return $type; |
361 | } |
362 | else{ |
363 | return $TYPE{$type}; |
364 | } |
321e5271 |
365 | } |
366 | |
2efc0af1 |
367 | sub find_or_create_does_type_constraint{ |
368 | not_supported; |
369 | } |
370 | |
321e5271 |
371 | sub find_or_create_isa_type_constraint { |
372 | my $type_constraint = shift; |
373 | |
9c85e9dc |
374 | Carp::confess("Got isa => type_constraints, but Mouse does not yet support parameterized types for containers other than ArrayRef and HashRef and Maybe (rt.cpan.org #39795)") |
375 | if $type_constraint =~ /\A ( [^\[]+ ) \[\.+\] \z/xms && |
376 | $1 ne 'ArrayRef' && |
377 | $1 ne 'HashRef' && |
378 | $1 ne 'Maybe' |
379 | ; |
380 | |
321e5271 |
381 | |
382 | $type_constraint =~ s/\s+//g; |
94593ae8 |
383 | |
2efc0af1 |
384 | my $tc = find_type_constraint($type_constraint); |
385 | if (!$tc) { |
94593ae8 |
386 | my @type_constraints = split /\|/, $type_constraint; |
387 | if (@type_constraints == 1) { |
2efc0af1 |
388 | $tc = $TYPE{$type_constraints[0]} || |
94593ae8 |
389 | _build_type_constraint($type_constraints[0]); |
2efc0af1 |
390 | } |
391 | else { |
94593ae8 |
392 | my @code_list = map { |
393 | $TYPE{$_} || _build_type_constraint($_) |
394 | } @type_constraints; |
2efc0af1 |
395 | |
396 | $tc = Mouse::Meta::TypeConstraint->new( |
397 | name => $type_constraint, |
398 | |
684db121 |
399 | _compiled_type_constraint => sub { |
2efc0af1 |
400 | foreach my $code (@code_list) { |
684db121 |
401 | return 1 if $code->check($_[0]); |
402 | } |
403 | return 0; |
404 | }, |
684db121 |
405 | ); |
94593ae8 |
406 | } |
321e5271 |
407 | } |
2efc0af1 |
408 | return $tc; |
321e5271 |
409 | } |
410 | |
d60c78b9 |
411 | 1; |
412 | |
6feb83f1 |
413 | __END__ |
414 | |
415 | =head1 NAME |
416 | |
5893ee36 |
417 | Mouse::Util::TypeConstraints - Type constraint system for Mouse |
418 | |
419 | =head2 SYNOPSIS |
420 | |
421 | use Mouse::Util::TypeConstraints; |
422 | |
423 | subtype 'Natural' |
424 | => as 'Int' |
425 | => where { $_ > 0 }; |
426 | |
427 | subtype 'NaturalLessThanTen' |
428 | => as 'Natural' |
429 | => where { $_ < 10 } |
430 | => message { "This number ($_) is not less than ten!" }; |
431 | |
432 | coerce 'Num' |
433 | => from 'Str' |
434 | => via { 0+$_ }; |
435 | |
436 | enum 'RGBColors' => qw(red green blue); |
437 | |
438 | no Mouse::Util::TypeConstraints; |
439 | |
440 | =head1 DESCRIPTION |
441 | |
442 | This module provides Mouse with the ability to create custom type |
443 | constraints to be used in attribute definition. |
444 | |
445 | =head2 Important Caveat |
446 | |
447 | This is B<NOT> a type system for Perl 5. These are type constraints, |
448 | and they are not used by Mouse unless you tell it to. No type |
449 | inference is performed, expressions are not typed, etc. etc. etc. |
450 | |
451 | A type constraint is at heart a small "check if a value is valid" |
452 | function. A constraint can be associated with an attribute. This |
453 | simplifies parameter validation, and makes your code clearer to read, |
454 | because you can refer to constraints by name. |
455 | |
456 | =head2 Slightly Less Important Caveat |
457 | |
458 | It is B<always> a good idea to quote your type names. |
459 | |
460 | This prevents Perl from trying to execute the call as an indirect |
461 | object call. This can be an issue when you have a subtype with the |
462 | same name as a valid class. |
463 | |
464 | For instance: |
465 | |
466 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
467 | |
468 | will I<just work>, while this: |
469 | |
470 | use DateTime; |
471 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
472 | |
473 | will fail silently and cause many headaches. The simple way to solve |
474 | this, as well as future proof your subtypes from classes which have |
475 | yet to have been created, is to quote the type name: |
476 | |
477 | use DateTime; |
478 | subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') }; |
479 | |
480 | =head2 Default Type Constraints |
481 | |
482 | This module also provides a simple hierarchy for Perl 5 types, here is |
483 | that hierarchy represented visually. |
484 | |
485 | Any |
486 | Item |
487 | Bool |
488 | Maybe[`a] |
489 | Undef |
490 | Defined |
491 | Value |
492 | Num |
493 | Int |
494 | Str |
495 | ClassName |
496 | RoleName |
497 | Ref |
498 | ScalarRef |
499 | ArrayRef[`a] |
500 | HashRef[`a] |
501 | CodeRef |
502 | RegexpRef |
503 | GlobRef |
504 | FileHandle |
505 | Object |
506 | Role |
507 | |
508 | B<NOTE:> Any type followed by a type parameter C<[`a]> can be |
509 | parameterized, this means you can say: |
510 | |
511 | ArrayRef[Int] # an array of integers |
512 | HashRef[CodeRef] # a hash of str to CODE ref mappings |
513 | Maybe[Str] # value may be a string, may be undefined |
514 | |
515 | If Mouse finds a name in brackets that it does not recognize as an |
516 | existing type, it assumes that this is a class name, for example |
517 | C<ArrayRef[DateTime]>. |
518 | |
519 | B<NOTE:> Unless you parameterize a type, then it is invalid to include |
520 | the square brackets. I.e. C<ArrayRef[]> will be treated as a new type |
521 | name, I<not> as a parameterization of C<ArrayRef>. |
522 | |
523 | B<NOTE:> The C<Undef> type constraint for the most part works |
524 | correctly now, but edge cases may still exist, please use it |
525 | sparingly. |
526 | |
527 | B<NOTE:> The C<ClassName> type constraint does a complex package |
528 | existence check. This means that your class B<must> be loaded for this |
529 | type constraint to pass. |
530 | |
531 | B<NOTE:> The C<RoleName> constraint checks a string is a I<package |
532 | name> which is a role, like C<'MyApp::Role::Comparable'>. The C<Role> |
533 | constraint checks that an I<object does> the named role. |
534 | |
535 | =head2 Type Constraint Naming |
536 | |
537 | Type name declared via this module can only contain alphanumeric |
538 | characters, colons (:), and periods (.). |
539 | |
540 | Since the types created by this module are global, it is suggested |
541 | that you namespace your types just as you would namespace your |
542 | modules. So instead of creating a I<Color> type for your |
543 | B<My::Graphics> module, you would call the type |
544 | I<My::Graphics::Types::Color> instead. |
545 | |
546 | =head2 Use with Other Constraint Modules |
547 | |
548 | This module can play nicely with other constraint modules with some |
549 | slight tweaking. The C<where> clause in types is expected to be a |
550 | C<CODE> reference which checks it's first argument and returns a |
551 | boolean. Since most constraint modules work in a similar way, it |
552 | should be simple to adapt them to work with Mouse. |
553 | |
554 | For instance, this is how you could use it with |
555 | L<Declare::Constraints::Simple> to declare a completely new type. |
556 | |
557 | type 'HashOfArrayOfObjects', |
558 | { |
559 | where => IsHashRef( |
560 | -keys => HasLength, |
561 | -values => IsArrayRef(IsObject) |
562 | ) |
563 | }; |
564 | |
565 | Here is an example of using L<Test::Deep> and it's non-test |
566 | related C<eq_deeply> function. |
567 | |
568 | type 'ArrayOfHashOfBarsAndRandomNumbers' |
569 | => where { |
570 | eq_deeply($_, |
571 | array_each(subhashof({ |
572 | bar => isa('Bar'), |
573 | random_number => ignore() |
574 | }))) |
575 | }; |
6feb83f1 |
576 | |
577 | =head1 METHODS |
578 | |
579 | =head2 optimized_constraints -> HashRef[CODE] |
580 | |
581 | Returns the simple type constraints that Mouse understands. |
582 | |
c91d12e0 |
583 | =head1 FUNCTIONS |
584 | |
585 | =over 4 |
586 | |
1820fffe |
587 | =item C<< subtype 'Name' => as 'Parent' => where { } ... -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
588 | |
1820fffe |
589 | =item C<< subtype as 'Parent' => where { } ... -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
590 | |
1820fffe |
591 | =item C<< class_type ($class, ?$options) -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
592 | |
1820fffe |
593 | =item C<< role_type ($role, ?$options) -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
594 | |
1820fffe |
595 | =item C<< enum (\@values) -> Mouse::Meta::TypeConstraint >> |
596 | |
597 | =back |
598 | |
599 | =over 4 |
600 | |
601 | =item C<< find_type_constraint(Type) -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
602 | |
603 | =back |
604 | |
5893ee36 |
605 | =head1 THANKS |
606 | |
1820fffe |
607 | Much of this documentation was taken from C<Moose::Util::TypeConstraints> |
608 | |
609 | =head1 SEE ALSO |
610 | |
611 | L<Moose::Util::TypeConstraints> |
5893ee36 |
612 | |
6feb83f1 |
613 | =cut |
614 | |
615 | |