Commit | Line | Data |
3b46bd49 |
1 | package Mouse::Util::TypeConstraints; |
bc69ee88 |
2 | use Mouse::Util qw(does_role not_supported); # enables strict and warnings |
9baf5d6b |
3 | |
f5ee065f |
4 | use Carp qw(confess); |
b7d1f970 |
5 | use Scalar::Util (); |
6d28c5cf |
6 | |
684db121 |
7 | use Mouse::Meta::TypeConstraint; |
bc69ee88 |
8 | use Mouse::Exporter; |
9 | |
10 | Mouse::Exporter->setup_import_methods( |
11 | as_is => [qw( |
5d4810c1 |
12 | as where message optimize_as |
13 | from via |
ebe91068 |
14 | |
15 | type subtype class_type role_type duck_type |
16 | enum |
17 | coerce |
18 | |
bc69ee88 |
19 | find_type_constraint |
20 | )], |
139d92d2 |
21 | ); |
22 | |
cceb0e25 |
23 | my %TYPE; |
4188b837 |
24 | |
ddbad0b1 |
25 | sub as ($) { (as => $_[0]) } |
26 | sub where (&) { (where => $_[0]) } |
27 | sub message (&) { (message => $_[0]) } |
5d4810c1 |
28 | sub optimize_as (&) { (optimize_as => $_[0]) } |
61a02a3a |
29 | |
73766a27 |
30 | sub from { @_ } |
cd2b9201 |
31 | sub via (&) { $_[0] } |
61a02a3a |
32 | |
321e5271 |
33 | BEGIN { |
993e62a7 |
34 | my %builtins = ( |
f5ee065f |
35 | Any => undef, # null check |
36 | Item => undef, # null check |
37 | Maybe => undef, # null check |
73766a27 |
38 | |
7d96ae4d |
39 | Bool => \&Bool, |
40 | Undef => \&Undef, |
41 | Defined => \&Defined, |
42 | Value => \&Value, |
43 | Num => \&Num, |
44 | Int => \&Int, |
45 | Str => \&Str, |
46 | Ref => \&Ref, |
c91d12e0 |
47 | |
7d96ae4d |
48 | ScalarRef => \&ScalarRef, |
49 | ArrayRef => \&ArrayRef, |
50 | HashRef => \&HashRef, |
51 | CodeRef => \&CodeRef, |
52 | RegexpRef => \&RegexpRef, |
53 | GlobRef => \&GlobRef, |
381f326a |
54 | |
7d96ae4d |
55 | FileHandle => \&FileHandle, |
381f326a |
56 | |
7d96ae4d |
57 | Object => \&Object, |
73766a27 |
58 | |
7d96ae4d |
59 | ClassName => \&ClassName, |
60 | RoleName => \&RoleName, |
8a7f2a8a |
61 | ); |
993e62a7 |
62 | |
63 | while (my ($name, $code) = each %builtins) { |
73766a27 |
64 | $TYPE{$name} = Mouse::Meta::TypeConstraint->new( |
3b89ea91 |
65 | name => $name, |
66 | optimized => $code, |
73766a27 |
67 | ); |
78b13827 |
68 | } |
d3982c7e |
69 | |
deb9a0f3 |
70 | sub optimized_constraints { # DEPRECATED |
f5ee065f |
71 | Carp::cluck('optimized_constraints() has been deprecated'); |
72 | return \%TYPE; |
73 | } |
d4571def |
74 | |
993e62a7 |
75 | my @builtins = keys %TYPE; |
76 | sub list_all_builtin_type_constraints { @builtins } |
77 | |
78 | sub list_all_type_constraints { keys %TYPE } |
381f326a |
79 | } |
d3982c7e |
80 | |
f5ee065f |
81 | sub _create_type{ |
82 | my $mode = shift; |
83 | |
73766a27 |
84 | my $name; |
f5ee065f |
85 | my %args; |
73766a27 |
86 | |
f5ee065f |
87 | if(@_ == 1 && ref $_[0]){ # @_ : { name => $name, where => ... } |
88 | %args = %{$_[0]}; |
73766a27 |
89 | } |
f5ee065f |
90 | elsif(@_ == 2 && ref $_[1]){ # @_ : $name => { where => ... } |
73766a27 |
91 | $name = $_[0]; |
f5ee065f |
92 | %args = %{$_[1]}; |
73766a27 |
93 | } |
f5ee065f |
94 | elsif(@_ % 2){ # @_ : $name => ( where => ... ) |
95 | ($name, %args) = @_; |
73766a27 |
96 | } |
f5ee065f |
97 | else{ # @_ : (name => $name, where => ...) |
98 | %args = @_; |
73766a27 |
99 | } |
100 | |
f5ee065f |
101 | if(!defined $name){ |
102 | if(!defined($name = $args{name})){ |
103 | $name = '__ANON__'; |
104 | } |
cd2b9201 |
105 | } |
d4571def |
106 | |
f5ee065f |
107 | $args{name} = $name; |
b8434acc |
108 | my $parent; |
109 | if($mode eq 'subtype'){ |
110 | $parent = delete $args{as}; |
111 | if(!$parent){ |
112 | $parent = delete $args{name}; |
113 | $name = '__ANON__'; |
114 | } |
115 | } |
7dbebb1b |
116 | |
f5ee065f |
117 | my $package_defined_in = $args{package_defined_in} ||= caller(1); |
d4571def |
118 | |
f5ee065f |
119 | my $existing = $TYPE{$name}; |
120 | if($existing && $existing->{package_defined_in} ne $package_defined_in){ |
121 | confess("The type constraint '$name' has already been created in " |
122 | . "$existing->{package_defined_in} and cannot be created again in $package_defined_in"); |
123 | } |
d4571def |
124 | |
b8434acc |
125 | $args{constraint} = delete $args{where} if exists $args{where}; |
24410e3a |
126 | $args{optimized} = delete $args{optimized_as} if exists $args{optimized_as}; |
0d9fea22 |
127 | |
f5ee065f |
128 | my $constraint; |
129 | if($mode eq 'subtype'){ |
24410e3a |
130 | $constraint = find_or_create_isa_type_constraint($parent)->create_child_type(%args); |
7a50b450 |
131 | } |
132 | else{ |
f5ee065f |
133 | $constraint = Mouse::Meta::TypeConstraint->new(%args); |
73766a27 |
134 | } |
7dbebb1b |
135 | |
f5ee065f |
136 | return $TYPE{$name} = $constraint; |
137 | } |
7dbebb1b |
138 | |
f5ee065f |
139 | sub type { |
140 | return _create_type('type', @_); |
141 | } |
d4571def |
142 | |
f5ee065f |
143 | sub subtype { |
144 | return _create_type('subtype', @_); |
4188b837 |
145 | } |
146 | |
139d92d2 |
147 | sub coerce { |
ffbbf459 |
148 | my $type_name = shift; |
61a02a3a |
149 | |
ffbbf459 |
150 | my $type = find_type_constraint($type_name) |
151 | or confess("Cannot find type '$type_name', perhaps you forgot to load it."); |
61a02a3a |
152 | |
ffbbf459 |
153 | $type->_add_type_coercions(@_); |
cd2b9201 |
154 | return; |
4188b837 |
155 | } |
156 | |
139d92d2 |
157 | sub class_type { |
337e3b0c |
158 | my($name, $options) = @_; |
159 | my $class = $options->{class} || $name; |
160 | return _create_type 'subtype', $name => ( |
ddbad0b1 |
161 | as => 'Object', |
e3540312 |
162 | optimized_as => Mouse::Util::generate_isa_predicate_for($class), |
f5ee065f |
163 | |
337e3b0c |
164 | type => 'Class', |
165 | ); |
ecc6e3b1 |
166 | } |
167 | |
139d92d2 |
168 | sub role_type { |
337e3b0c |
169 | my($name, $options) = @_; |
170 | my $role = $options->{role} || $name; |
171 | return _create_type 'subtype', $name => ( |
1d5ecd5f |
172 | as => 'Object', |
b7d1f970 |
173 | optimized_as => sub { Scalar::Util::blessed($_[0]) && does_role($_[0], $role) }, |
f5ee065f |
174 | |
175 | type => 'Role', |
61a02a3a |
176 | ); |
47f36c05 |
177 | } |
178 | |
ebe91068 |
179 | sub duck_type { |
180 | my($name, @methods); |
181 | |
182 | if(!(@_ == 1 && ref($_[0]) eq 'ARRAY')){ |
183 | $name = shift; |
184 | } |
185 | |
186 | @methods = (@_ == 1 && ref($_[0]) eq 'ARRAY') ? @{$_[0]} : @_; |
187 | |
188 | return _create_type 'type', $name => ( |
189 | optimized_as => Mouse::Util::generate_can_predicate_for(\@methods), |
190 | |
191 | type => 'DuckType', |
192 | ); |
193 | } |
194 | |
deb9a0f3 |
195 | sub typecast_constraints { # DEPRECATED |
ffbbf459 |
196 | my($class, $pkg, $type, $value) = @_; |
2efc0af1 |
197 | Carp::croak("wrong arguments count") unless @_ == 4; |
eec1bb49 |
198 | |
e763d56e |
199 | Carp::cluck("typecast_constraints() has been deprecated, which was an internal utility anyway"); |
200 | |
ffbbf459 |
201 | return $type->coerce($value); |
4188b837 |
202 | } |
203 | |
d44f0d03 |
204 | sub enum { |
f5ee065f |
205 | my($name, %valid); |
206 | |
f152b099 |
207 | if(!(@_ == 1 && ref($_[0]) eq 'ARRAY')){ |
208 | $name = shift; |
f5ee065f |
209 | } |
f152b099 |
210 | |
211 | %valid = map{ $_ => undef } (@_ == 1 && ref($_[0]) eq 'ARRAY' ? @{$_[0]} : @_); |
212 | |
f5ee065f |
213 | return _create_type 'type', $name => ( |
214 | optimized_as => sub{ defined($_[0]) && !ref($_[0]) && exists $valid{$_[0]} }, |
215 | |
216 | type => 'Enum', |
217 | ); |
218 | } |
219 | |
220 | sub _find_or_create_regular_type{ |
221 | my($spec) = @_; |
222 | |
223 | return $TYPE{$spec} if exists $TYPE{$spec}; |
01904723 |
224 | |
337e3b0c |
225 | my $meta = Mouse::Util::get_metaclass_by_name($spec) |
226 | or return undef; |
01904723 |
227 | |
f48920c1 |
228 | if(Mouse::Util::is_a_metarole($meta)){ |
1d5ecd5f |
229 | return role_type($spec); |
f5ee065f |
230 | } |
231 | else{ |
1d5ecd5f |
232 | return class_type($spec); |
f5ee065f |
233 | } |
d44f0d03 |
234 | } |
235 | |
619338ac |
236 | $TYPE{ArrayRef}{constraint_generator} = \&_parameterize_ArrayRef_for; |
237 | $TYPE{HashRef}{constraint_generator} = \&_parameterize_HashRef_for; |
238 | $TYPE{Maybe}{constraint_generator} = \&_parameterize_Maybe_for; |
f5ee065f |
239 | |
240 | sub _find_or_create_parameterized_type{ |
241 | my($base, $param) = @_; |
242 | |
243 | my $name = sprintf '%s[%s]', $base->name, $param->name; |
244 | |
b4d791ba |
245 | $TYPE{$name} ||= $base->parameterize($param, $name); |
f5ee065f |
246 | } |
b4d791ba |
247 | |
f5ee065f |
248 | sub _find_or_create_union_type{ |
a2f1294a |
249 | my @types = sort map{ $_->{type_constraints} ? @{$_->{type_constraints}} : $_ } @_; |
f5ee065f |
250 | |
30b28db3 |
251 | my $name = join '|', @types; |
f5ee065f |
252 | |
b4d791ba |
253 | $TYPE{$name} ||= Mouse::Meta::TypeConstraint->new( |
254 | name => $name, |
255 | type_constraints => \@types, |
f5ee065f |
256 | |
b4d791ba |
257 | type => 'Union', |
258 | ); |
f5ee065f |
259 | } |
260 | |
261 | # The type parser |
262 | sub _parse_type{ |
263 | my($spec, $start) = @_; |
264 | |
265 | my @list; |
266 | my $subtype; |
267 | |
268 | my $len = length $spec; |
269 | my $i; |
270 | |
271 | for($i = $start; $i < $len; $i++){ |
272 | my $char = substr($spec, $i, 1); |
273 | |
274 | if($char eq '['){ |
57f0e313 |
275 | my $base = _find_or_create_regular_type( substr($spec, $start, $i - $start) ) |
f5ee065f |
276 | or return; |
277 | |
278 | ($i, $subtype) = _parse_type($spec, $i+1) |
279 | or return; |
280 | $start = $i+1; # reset |
281 | |
282 | push @list, _find_or_create_parameterized_type($base => $subtype); |
321e5271 |
283 | } |
f5ee065f |
284 | elsif($char eq ']'){ |
285 | $len = $i+1; |
286 | last; |
321e5271 |
287 | } |
f5ee065f |
288 | elsif($char eq '|'){ |
57f0e313 |
289 | my $type = _find_or_create_regular_type( substr($spec, $start, $i - $start) ); |
290 | |
57f0e313 |
291 | if(!defined $type){ |
3b89ea91 |
292 | # XXX: Mouse creates a new class type, but Moose does not. |
293 | $type = class_type( substr($spec, $start, $i - $start) ); |
57f0e313 |
294 | } |
f5ee065f |
295 | |
296 | push @list, $type; |
297 | |
298 | ($i, $subtype) = _parse_type($spec, $i+1) |
299 | or return; |
300 | |
301 | $start = $i+1; # reset |
302 | |
303 | push @list, $subtype; |
321e5271 |
304 | } |
305 | } |
f5ee065f |
306 | if($i - $start){ |
29376895 |
307 | my $type = _find_or_create_regular_type( substr $spec, $start, $i - $start ); |
308 | |
309 | if(defined $type){ |
310 | push @list, $type; |
311 | } |
312 | elsif($start != 0) { |
313 | # RT #50421 |
314 | # create a new class type |
315 | push @list, class_type( substr $spec, $start, $i - $start ); |
316 | } |
f5ee065f |
317 | } |
321e5271 |
318 | |
f5ee065f |
319 | if(@list == 0){ |
320 | return; |
321 | } |
322 | elsif(@list == 1){ |
323 | return ($len, $list[0]); |
993e62a7 |
324 | } |
325 | else{ |
f5ee065f |
326 | return ($len, _find_or_create_union_type(@list)); |
993e62a7 |
327 | } |
321e5271 |
328 | } |
329 | |
f5ee065f |
330 | |
331 | sub find_type_constraint { |
332 | my($spec) = @_; |
f48920c1 |
333 | return $spec if Mouse::Util::is_a_type_constraint($spec); |
f5ee065f |
334 | |
335 | $spec =~ s/\s+//g; |
336 | return $TYPE{$spec}; |
2efc0af1 |
337 | } |
338 | |
f5ee065f |
339 | sub find_or_parse_type_constraint { |
340 | my($spec) = @_; |
f48920c1 |
341 | return $spec if Mouse::Util::is_a_type_constraint($spec); |
9c85e9dc |
342 | |
f5ee065f |
343 | $spec =~ s/\s+//g; |
344 | return $TYPE{$spec} || do{ |
345 | my($pos, $type) = _parse_type($spec, 0); |
346 | $type; |
347 | }; |
348 | } |
321e5271 |
349 | |
f5ee065f |
350 | sub find_or_create_does_type_constraint{ |
ddbad0b1 |
351 | # XXX: Moose does not register a new role_type, but Mouse does. |
bddbe49f |
352 | return find_or_parse_type_constraint(@_) || role_type(@_); |
f5ee065f |
353 | } |
354 | |
355 | sub find_or_create_isa_type_constraint { |
ddbad0b1 |
356 | # XXX: Moose does not register a new class_type, but Mouse does. |
f5ee065f |
357 | return find_or_parse_type_constraint(@_) || class_type(@_); |
321e5271 |
358 | } |
359 | |
d60c78b9 |
360 | 1; |
6feb83f1 |
361 | __END__ |
362 | |
363 | =head1 NAME |
364 | |
5893ee36 |
365 | Mouse::Util::TypeConstraints - Type constraint system for Mouse |
366 | |
a25ca8d6 |
367 | =head1 VERSION |
368 | |
4819ed36 |
369 | This document describes Mouse version 0.43 |
a25ca8d6 |
370 | |
5893ee36 |
371 | =head2 SYNOPSIS |
372 | |
373 | use Mouse::Util::TypeConstraints; |
374 | |
375 | subtype 'Natural' |
376 | => as 'Int' |
377 | => where { $_ > 0 }; |
378 | |
379 | subtype 'NaturalLessThanTen' |
380 | => as 'Natural' |
381 | => where { $_ < 10 } |
382 | => message { "This number ($_) is not less than ten!" }; |
383 | |
384 | coerce 'Num' |
385 | => from 'Str' |
386 | => via { 0+$_ }; |
387 | |
388 | enum 'RGBColors' => qw(red green blue); |
389 | |
390 | no Mouse::Util::TypeConstraints; |
391 | |
392 | =head1 DESCRIPTION |
393 | |
394 | This module provides Mouse with the ability to create custom type |
395 | constraints to be used in attribute definition. |
396 | |
397 | =head2 Important Caveat |
398 | |
399 | This is B<NOT> a type system for Perl 5. These are type constraints, |
400 | and they are not used by Mouse unless you tell it to. No type |
401 | inference is performed, expressions are not typed, etc. etc. etc. |
402 | |
403 | A type constraint is at heart a small "check if a value is valid" |
404 | function. A constraint can be associated with an attribute. This |
405 | simplifies parameter validation, and makes your code clearer to read, |
406 | because you can refer to constraints by name. |
407 | |
408 | =head2 Slightly Less Important Caveat |
409 | |
410 | It is B<always> a good idea to quote your type names. |
411 | |
412 | This prevents Perl from trying to execute the call as an indirect |
413 | object call. This can be an issue when you have a subtype with the |
414 | same name as a valid class. |
415 | |
416 | For instance: |
417 | |
418 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
419 | |
420 | will I<just work>, while this: |
421 | |
422 | use DateTime; |
423 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
424 | |
425 | will fail silently and cause many headaches. The simple way to solve |
426 | this, as well as future proof your subtypes from classes which have |
427 | yet to have been created, is to quote the type name: |
428 | |
429 | use DateTime; |
430 | subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') }; |
431 | |
432 | =head2 Default Type Constraints |
433 | |
434 | This module also provides a simple hierarchy for Perl 5 types, here is |
435 | that hierarchy represented visually. |
436 | |
dba2e142 |
437 | Any |
5893ee36 |
438 | Item |
439 | Bool |
440 | Maybe[`a] |
441 | Undef |
442 | Defined |
443 | Value |
5893ee36 |
444 | Str |
dba2e142 |
445 | Num |
446 | Int |
447 | ClassName |
448 | RoleName |
5893ee36 |
449 | Ref |
450 | ScalarRef |
451 | ArrayRef[`a] |
452 | HashRef[`a] |
453 | CodeRef |
454 | RegexpRef |
455 | GlobRef |
dba2e142 |
456 | FileHandle |
5893ee36 |
457 | Object |
5893ee36 |
458 | |
459 | B<NOTE:> Any type followed by a type parameter C<[`a]> can be |
460 | parameterized, this means you can say: |
461 | |
462 | ArrayRef[Int] # an array of integers |
463 | HashRef[CodeRef] # a hash of str to CODE ref mappings |
464 | Maybe[Str] # value may be a string, may be undefined |
465 | |
466 | If Mouse finds a name in brackets that it does not recognize as an |
467 | existing type, it assumes that this is a class name, for example |
468 | C<ArrayRef[DateTime]>. |
469 | |
470 | B<NOTE:> Unless you parameterize a type, then it is invalid to include |
471 | the square brackets. I.e. C<ArrayRef[]> will be treated as a new type |
472 | name, I<not> as a parameterization of C<ArrayRef>. |
473 | |
474 | B<NOTE:> The C<Undef> type constraint for the most part works |
475 | correctly now, but edge cases may still exist, please use it |
476 | sparingly. |
477 | |
478 | B<NOTE:> The C<ClassName> type constraint does a complex package |
479 | existence check. This means that your class B<must> be loaded for this |
480 | type constraint to pass. |
481 | |
482 | B<NOTE:> The C<RoleName> constraint checks a string is a I<package |
483 | name> which is a role, like C<'MyApp::Role::Comparable'>. The C<Role> |
484 | constraint checks that an I<object does> the named role. |
485 | |
486 | =head2 Type Constraint Naming |
487 | |
488 | Type name declared via this module can only contain alphanumeric |
489 | characters, colons (:), and periods (.). |
490 | |
491 | Since the types created by this module are global, it is suggested |
492 | that you namespace your types just as you would namespace your |
493 | modules. So instead of creating a I<Color> type for your |
494 | B<My::Graphics> module, you would call the type |
495 | I<My::Graphics::Types::Color> instead. |
496 | |
497 | =head2 Use with Other Constraint Modules |
498 | |
499 | This module can play nicely with other constraint modules with some |
500 | slight tweaking. The C<where> clause in types is expected to be a |
501 | C<CODE> reference which checks it's first argument and returns a |
502 | boolean. Since most constraint modules work in a similar way, it |
503 | should be simple to adapt them to work with Mouse. |
504 | |
505 | For instance, this is how you could use it with |
506 | L<Declare::Constraints::Simple> to declare a completely new type. |
507 | |
508 | type 'HashOfArrayOfObjects', |
509 | { |
510 | where => IsHashRef( |
511 | -keys => HasLength, |
512 | -values => IsArrayRef(IsObject) |
513 | ) |
514 | }; |
515 | |
516 | Here is an example of using L<Test::Deep> and it's non-test |
517 | related C<eq_deeply> function. |
518 | |
519 | type 'ArrayOfHashOfBarsAndRandomNumbers' |
520 | => where { |
521 | eq_deeply($_, |
522 | array_each(subhashof({ |
523 | bar => isa('Bar'), |
524 | random_number => ignore() |
525 | }))) |
526 | }; |
6feb83f1 |
527 | |
528 | =head1 METHODS |
529 | |
24410e3a |
530 | =head2 C<< list_all_builtin_type_constraints -> (Names) >> |
6feb83f1 |
531 | |
24410e3a |
532 | Returns the names of builtin type constraints. |
533 | |
534 | =head2 C<< list_all_type_constraints -> (Names) >> |
535 | |
536 | Returns the names of all the type constraints. |
6feb83f1 |
537 | |
c91d12e0 |
538 | =head1 FUNCTIONS |
539 | |
540 | =over 4 |
541 | |
1820fffe |
542 | =item C<< subtype 'Name' => as 'Parent' => where { } ... -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
543 | |
1820fffe |
544 | =item C<< subtype as 'Parent' => where { } ... -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
545 | |
1820fffe |
546 | =item C<< class_type ($class, ?$options) -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
547 | |
1820fffe |
548 | =item C<< role_type ($role, ?$options) -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
549 | |
1820fffe |
550 | =item C<< enum (\@values) -> Mouse::Meta::TypeConstraint >> |
551 | |
552 | =back |
553 | |
554 | =over 4 |
555 | |
556 | =item C<< find_type_constraint(Type) -> Mouse::Meta::TypeConstraint >> |
c91d12e0 |
557 | |
558 | =back |
559 | |
5893ee36 |
560 | =head1 THANKS |
561 | |
1820fffe |
562 | Much of this documentation was taken from C<Moose::Util::TypeConstraints> |
563 | |
564 | =head1 SEE ALSO |
565 | |
566 | L<Moose::Util::TypeConstraints> |
5893ee36 |
567 | |
6feb83f1 |
568 | =cut |
569 | |
570 | |