Commit | Line | Data |
a15dff8d |
1 | |
2 | package Moose::Util::TypeConstraints; |
3 | |
998a8a25 |
4 | use Carp (); |
9e856c83 |
5 | use List::MoreUtils qw( all any ); |
9a63faba |
6 | use Scalar::Util qw( blessed reftype ); |
e606ae5f |
7 | use Moose::Exporter; |
a15dff8d |
8 | |
d9b40005 |
9 | ## -------------------------------------------------------- |
e85d2a5d |
10 | # Prototyped subs must be predeclared because we have a |
11 | # circular dependency with Moose::Meta::Attribute et. al. |
12 | # so in case of us being use'd first the predeclaration |
d9b40005 |
13 | # ensures the prototypes are in scope when consumers are |
14 | # compiled. |
15 | |
d9b40005 |
16 | # dah sugah! |
180899ed |
17 | sub where (&); |
18 | sub via (&); |
19 | sub message (&); |
d9b40005 |
20 | sub optimize_as (&); |
4e36cf24 |
21 | sub inline_as (&); |
d9b40005 |
22 | |
d9b40005 |
23 | ## -------------------------------------------------------- |
8c4acc60 |
24 | |
1fa1a58d |
25 | use Moose::Deprecated; |
4e036ee4 |
26 | use Moose::Meta::TypeConstraint; |
3726f905 |
27 | use Moose::Meta::TypeConstraint::Union; |
0fbd4b0a |
28 | use Moose::Meta::TypeConstraint::Parameterized; |
7e4e1ad4 |
29 | use Moose::Meta::TypeConstraint::Parameterizable; |
620db045 |
30 | use Moose::Meta::TypeConstraint::Class; |
31 | use Moose::Meta::TypeConstraint::Role; |
dabed765 |
32 | use Moose::Meta::TypeConstraint::Enum; |
0a6bff54 |
33 | use Moose::Meta::TypeConstraint::DuckType; |
2ca63f5d |
34 | use Moose::Meta::TypeCoercion; |
3726f905 |
35 | use Moose::Meta::TypeCoercion::Union; |
22aed3c0 |
36 | use Moose::Meta::TypeConstraint::Registry; |
4e036ee4 |
37 | |
e606ae5f |
38 | Moose::Exporter->setup_import_methods( |
39 | as_is => [ |
40 | qw( |
180899ed |
41 | type subtype class_type role_type maybe_type duck_type |
7afaa906 |
42 | as where message optimize_as inline_as |
e606ae5f |
43 | coerce from via |
44 | enum |
45 | find_type_constraint |
0d29b772 |
46 | register_type_constraint |
47 | match_on_type ) |
e606ae5f |
48 | ], |
e606ae5f |
49 | ); |
a15dff8d |
50 | |
d9b40005 |
51 | ## -------------------------------------------------------- |
52 | ## type registry and some useful functions for it |
53 | ## -------------------------------------------------------- |
54 | |
22aed3c0 |
55 | my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new; |
587ae0d2 |
56 | |
180899ed |
57 | sub get_type_constraint_registry {$REGISTRY} |
58 | sub list_all_type_constraints { keys %{ $REGISTRY->type_constraints } } |
59 | |
d9b40005 |
60 | sub export_type_constraints_as_functions { |
61 | my $pkg = caller(); |
62 | no strict 'refs'; |
180899ed |
63 | foreach my $constraint ( keys %{ $REGISTRY->type_constraints } ) { |
64 | my $tc = $REGISTRY->get_type_constraint($constraint) |
65 | ->_compiled_type_constraint; |
66 | *{"${pkg}::${constraint}"} |
67 | = sub { $tc->( $_[0] ) ? 1 : undef }; # the undef is for compat |
a0f8153d |
68 | } |
d9b40005 |
69 | } |
182134e8 |
70 | |
0c015f1b |
71 | sub create_type_constraint_union { |
d9b40005 |
72 | my @type_constraint_names; |
e85d2a5d |
73 | |
180899ed |
74 | if ( scalar @_ == 1 && _detect_type_constraint_union( $_[0] ) ) { |
75 | @type_constraint_names = _parse_type_constraint_union( $_[0] ); |
d9b40005 |
76 | } |
77 | else { |
78 | @type_constraint_names = @_; |
429ccc11 |
79 | } |
180899ed |
80 | |
81 | ( scalar @type_constraint_names >= 2 ) |
82 | || __PACKAGE__->_throw_error( |
83 | "You must pass in at least 2 type names to make a union"); |
e85d2a5d |
84 | |
84a9c64c |
85 | my @type_constraints = map { |
180899ed |
86 | find_or_parse_type_constraint($_) |
87 | || __PACKAGE__->_throw_error( |
88 | "Could not locate type constraint ($_) for the union"); |
08380fdb |
89 | } @type_constraint_names; |
84a9c64c |
90 | |
3726f905 |
91 | return Moose::Meta::TypeConstraint::Union->new( |
180899ed |
92 | type_constraints => \@type_constraints ); |
182134e8 |
93 | } |
a15dff8d |
94 | |
0c015f1b |
95 | sub create_parameterized_type_constraint { |
d9b40005 |
96 | my $type_constraint_name = shift; |
180899ed |
97 | my ( $base_type, $type_parameter ) |
98 | = _parse_parameterized_type_constraint($type_constraint_name); |
e85d2a5d |
99 | |
180899ed |
100 | ( defined $base_type && defined $type_parameter ) |
101 | || __PACKAGE__->_throw_error( |
102 | "Could not parse type name ($type_constraint_name) correctly"); |
e85d2a5d |
103 | |
180899ed |
104 | if ( $REGISTRY->has_type_constraint($base_type) ) { |
90e78884 |
105 | my $base_type_tc = $REGISTRY->get_type_constraint($base_type); |
106 | return _create_parameterized_type_constraint( |
107 | $base_type_tc, |
108 | $type_parameter |
109 | ); |
180899ed |
110 | } |
111 | else { |
112 | __PACKAGE__->_throw_error( |
113 | "Could not locate the base type ($base_type)"); |
90e78884 |
114 | } |
22aed3c0 |
115 | } |
116 | |
90e78884 |
117 | sub _create_parameterized_type_constraint { |
118 | my ( $base_type_tc, $type_parameter ) = @_; |
119 | if ( $base_type_tc->can('parameterize') ) { |
120 | return $base_type_tc->parameterize($type_parameter); |
180899ed |
121 | } |
122 | else { |
90e78884 |
123 | return Moose::Meta::TypeConstraint::Parameterized->new( |
180899ed |
124 | name => $base_type_tc->name . '[' . $type_parameter . ']', |
90e78884 |
125 | parent => $base_type_tc, |
180899ed |
126 | type_parameter => |
127 | find_or_create_isa_type_constraint($type_parameter), |
90e78884 |
128 | ); |
129 | } |
180899ed |
130 | } |
90e78884 |
131 | |
4ab662d6 |
132 | #should we also support optimized checks? |
0c015f1b |
133 | sub create_class_type_constraint { |
620db045 |
134 | my ( $class, $options ) = @_; |
135 | |
180899ed |
136 | # too early for this check |
137 | #find_type_constraint("ClassName")->check($class) |
138 | # || __PACKAGE__->_throw_error("Can't create a class type constraint because '$class' is not a class name"); |
3fef8ce8 |
139 | |
620db045 |
140 | my %options = ( |
141 | class => $class, |
142 | name => $class, |
143 | %{ $options || {} }, |
4ab662d6 |
144 | ); |
620db045 |
145 | |
146 | $options{name} ||= "__ANON__"; |
147 | |
180899ed |
148 | Moose::Meta::TypeConstraint::Class->new(%options); |
3fef8ce8 |
149 | } |
150 | |
0c015f1b |
151 | sub create_role_type_constraint { |
620db045 |
152 | my ( $role, $options ) = @_; |
e85d2a5d |
153 | |
180899ed |
154 | # too early for this check |
155 | #find_type_constraint("ClassName")->check($class) |
156 | # || __PACKAGE__->_throw_error("Can't create a class type constraint because '$class' is not a class name"); |
e85d2a5d |
157 | |
620db045 |
158 | my %options = ( |
159 | role => $role, |
160 | name => $role, |
161 | %{ $options || {} }, |
162 | ); |
e85d2a5d |
163 | |
620db045 |
164 | $options{name} ||= "__ANON__"; |
165 | |
180899ed |
166 | Moose::Meta::TypeConstraint::Role->new(%options); |
620db045 |
167 | } |
168 | |
0c015f1b |
169 | sub find_or_create_type_constraint { |
620db045 |
170 | my ( $type_constraint_name, $options_for_anon_type ) = @_; |
171 | |
180899ed |
172 | if ( my $constraint |
173 | = find_or_parse_type_constraint($type_constraint_name) ) { |
620db045 |
174 | return $constraint; |
d9b40005 |
175 | } |
620db045 |
176 | elsif ( defined $options_for_anon_type ) { |
180899ed |
177 | |
d9b40005 |
178 | # NOTE: |
4ab662d6 |
179 | # if there is no $options_for_anon_type |
180 | # specified, then we assume they don't |
f3c4e20e |
181 | # want to create one, and return nothing. |
f3c4e20e |
182 | |
d9b40005 |
183 | # otherwise assume that we should create |
e85d2a5d |
184 | # an ANON type with the $options_for_anon_type |
d9b40005 |
185 | # options which can be passed in. It should |
e85d2a5d |
186 | # be noted that these don't get registered |
d9b40005 |
187 | # so we need to return it. |
188 | # - SL |
189 | return Moose::Meta::TypeConstraint->new( |
190 | name => '__ANON__', |
e85d2a5d |
191 | %{$options_for_anon_type} |
d9b40005 |
192 | ); |
193 | } |
e85d2a5d |
194 | |
620db045 |
195 | return; |
196 | } |
197 | |
0c015f1b |
198 | sub find_or_create_isa_type_constraint { |
620db045 |
199 | my $type_constraint_name = shift; |
180899ed |
200 | find_or_parse_type_constraint($type_constraint_name) |
201 | || create_class_type_constraint($type_constraint_name); |
620db045 |
202 | } |
203 | |
0c015f1b |
204 | sub find_or_create_does_type_constraint { |
620db045 |
205 | my $type_constraint_name = shift; |
180899ed |
206 | find_or_parse_type_constraint($type_constraint_name) |
207 | || create_role_type_constraint($type_constraint_name); |
620db045 |
208 | } |
209 | |
0c015f1b |
210 | sub find_or_parse_type_constraint { |
eb4c4e82 |
211 | my $type_constraint_name = normalize_type_constraint_name(shift); |
620db045 |
212 | my $constraint; |
180899ed |
213 | |
214 | if ( $constraint = find_type_constraint($type_constraint_name) ) { |
e606ae5f |
215 | return $constraint; |
180899ed |
216 | } |
217 | elsif ( _detect_type_constraint_union($type_constraint_name) ) { |
620db045 |
218 | $constraint = create_type_constraint_union($type_constraint_name); |
180899ed |
219 | } |
220 | elsif ( _detect_parameterized_type_constraint($type_constraint_name) ) { |
221 | $constraint |
222 | = create_parameterized_type_constraint($type_constraint_name); |
223 | } |
224 | else { |
620db045 |
225 | return; |
226 | } |
bb6c8335 |
227 | |
d9b40005 |
228 | $REGISTRY->add_type_constraint($constraint); |
e85d2a5d |
229 | return $constraint; |
d9b40005 |
230 | } |
22aed3c0 |
231 | |
eb4c4e82 |
232 | sub normalize_type_constraint_name { |
84a9c64c |
233 | my $type_constraint_name = shift; |
c8f663b2 |
234 | $type_constraint_name =~ s/\s//g; |
eb4c4e82 |
235 | return $type_constraint_name; |
236 | } |
237 | |
5f223879 |
238 | sub _confess { |
239 | my $error = shift; |
240 | |
241 | local $Carp::CarpLevel = $Carp::CarpLevel + 1; |
242 | Carp::confess($error); |
243 | } |
244 | |
22aed3c0 |
245 | ## -------------------------------------------------------- |
246 | ## exported functions ... |
247 | ## -------------------------------------------------------- |
248 | |
0c015f1b |
249 | sub find_type_constraint { |
eeedfc8a |
250 | my $type = shift; |
251 | |
252 | if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) { |
253 | return $type; |
e606ae5f |
254 | } |
255 | else { |
256 | return unless $REGISTRY->has_type_constraint($type); |
eeedfc8a |
257 | return $REGISTRY->get_type_constraint($type); |
258 | } |
259 | } |
22aed3c0 |
260 | |
0c015f1b |
261 | sub register_type_constraint { |
3fef8ce8 |
262 | my $constraint = shift; |
180899ed |
263 | __PACKAGE__->_throw_error("can't register an unnamed type constraint") |
264 | unless defined $constraint->name; |
3fef8ce8 |
265 | $REGISTRY->add_type_constraint($constraint); |
dabed765 |
266 | return $constraint; |
3fef8ce8 |
267 | } |
268 | |
7c13858b |
269 | # type constructors |
a15dff8d |
270 | |
9c27968f |
271 | sub type { |
9e856c83 |
272 | my $name = shift; |
9a63faba |
273 | |
9e856c83 |
274 | my %p = map { %{$_} } @_; |
275 | |
180899ed |
276 | return _create_type_constraint( |
277 | $name, undef, $p{where}, $p{message}, |
4e36cf24 |
278 | $p{optimize_as}, $p{inline_as}, |
180899ed |
279 | ); |
a15dff8d |
280 | } |
281 | |
9c27968f |
282 | sub subtype { |
180899ed |
283 | if ( @_ == 1 && !ref $_[0] ) { |
284 | __PACKAGE__->_throw_error( |
285 | 'A subtype cannot consist solely of a name, it must have a parent' |
286 | ); |
f75f625d |
287 | } |
288 | |
f6c0c589 |
289 | # The blessed check is mostly to accommodate MooseX::Types, which |
290 | # uses an object which overloads stringification as a type name. |
180899ed |
291 | my $name = ref $_[0] && !blessed $_[0] ? undef : shift; |
9a63faba |
292 | |
293 | my %p = map { %{$_} } @_; |
294 | |
295 | # subtype Str => where { ... }; |
180899ed |
296 | if ( !exists $p{as} ) { |
9e856c83 |
297 | $p{as} = $name; |
9a63faba |
298 | $name = undef; |
299 | } |
300 | |
180899ed |
301 | return _create_type_constraint( |
302 | $name, $p{as}, $p{where}, $p{message}, |
4e36cf24 |
303 | $p{optimize_as}, $p{inline_as}, |
180899ed |
304 | ); |
a15dff8d |
305 | } |
306 | |
9c27968f |
307 | sub class_type { |
4ab662d6 |
308 | register_type_constraint( |
309 | create_class_type_constraint( |
310 | $_[0], |
180899ed |
311 | ( defined( $_[1] ) ? $_[1] : () ), |
4ab662d6 |
312 | ) |
313 | ); |
3fef8ce8 |
314 | } |
315 | |
620db045 |
316 | sub role_type ($;$) { |
317 | register_type_constraint( |
318 | create_role_type_constraint( |
319 | $_[0], |
180899ed |
320 | ( defined( $_[1] ) ? $_[1] : () ), |
620db045 |
321 | ) |
322 | ); |
323 | } |
324 | |
1b2c9bda |
325 | sub maybe_type { |
326 | my ($type_parameter) = @_; |
327 | |
28ce1444 |
328 | register_type_constraint( |
ed7060d9 |
329 | $REGISTRY->get_type_constraint('Maybe')->parameterize($type_parameter) |
28ce1444 |
330 | ); |
1b2c9bda |
331 | } |
332 | |
180899ed |
333 | sub duck_type { |
cdacfaf3 |
334 | my ( $type_name, @methods ) = @_; |
180899ed |
335 | if ( ref $type_name eq 'ARRAY' && !@methods ) { |
cdacfaf3 |
336 | @methods = @$type_name; |
180899ed |
337 | $type_name = undef; |
338 | } |
bce5d4a5 |
339 | if ( @methods == 1 && ref $methods[0] eq 'ARRAY' ) { |
340 | @methods = @{ $methods[0] }; |
341 | } |
180899ed |
342 | |
343 | register_type_constraint( |
0a6bff54 |
344 | create_duck_type_constraint( |
cdacfaf3 |
345 | $type_name, |
0a6bff54 |
346 | \@methods, |
180899ed |
347 | ) |
348 | ); |
349 | } |
350 | |
9c27968f |
351 | sub coerce { |
180899ed |
352 | my ( $type_name, @coercion_map ) = @_; |
353 | _install_type_coercions( $type_name, \@coercion_map ); |
182134e8 |
354 | } |
355 | |
f6c0c589 |
356 | # The trick of returning @_ lets us avoid having to specify a |
357 | # prototype. Perl will parse this: |
358 | # |
359 | # subtype 'Foo' |
360 | # => as 'Str' |
361 | # => where { ... } |
362 | # |
363 | # as this: |
364 | # |
365 | # subtype( 'Foo', as( 'Str', where { ... } ) ); |
366 | # |
69229b40 |
367 | # If as() returns all its extra arguments, this just works, and |
f6c0c589 |
368 | # preserves backwards compatibility. |
180899ed |
369 | sub as { { as => shift }, @_ } |
9e856c83 |
370 | sub where (&) { { where => $_[0] } } |
371 | sub message (&) { { message => $_[0] } } |
372 | sub optimize_as (&) { { optimize_as => $_[0] } } |
4e36cf24 |
373 | sub inline_as (&) { { inline_as => $_[0] } } |
8ecb1fa0 |
374 | |
9a63faba |
375 | sub from {@_} |
376 | sub via (&) { $_[0] } |
a15dff8d |
377 | |
9c27968f |
378 | sub enum { |
180899ed |
379 | my ( $type_name, @values ) = @_; |
380 | |
4ab662d6 |
381 | # NOTE: |
382 | # if only an array-ref is passed then |
9f4334a1 |
383 | # you get an anon-enum |
384 | # - SL |
f6af1028 |
385 | if ( ref $type_name eq 'ARRAY' ) { |
386 | @values == 0 |
387 | || __PACKAGE__->_throw_error("enum called with an array reference and additional arguments. Did you mean to parenthesize the enum call's parameters?"); |
388 | |
9f4334a1 |
389 | @values = @$type_name; |
390 | $type_name = undef; |
391 | } |
bce5d4a5 |
392 | if ( @values == 1 && ref $values[0] eq 'ARRAY' ) { |
393 | @values = @{ $values[0] }; |
394 | } |
dabed765 |
395 | |
396 | register_type_constraint( |
397 | create_enum_type_constraint( |
398 | $type_name, |
399 | \@values, |
400 | ) |
401 | ); |
402 | } |
403 | |
0c015f1b |
404 | sub create_enum_type_constraint { |
dabed765 |
405 | my ( $type_name, $values ) = @_; |
e606ae5f |
406 | |
dabed765 |
407 | Moose::Meta::TypeConstraint::Enum->new( |
180899ed |
408 | name => $type_name || '__ANON__', |
dabed765 |
409 | values => $values, |
a0f8153d |
410 | ); |
fcec2383 |
411 | } |
412 | |
0a6bff54 |
413 | sub create_duck_type_constraint { |
414 | my ( $type_name, $methods ) = @_; |
415 | |
416 | Moose::Meta::TypeConstraint::DuckType->new( |
417 | name => $type_name || '__ANON__', |
418 | methods => $methods, |
419 | ); |
420 | } |
421 | |
0d29b772 |
422 | sub match_on_type { |
423 | my ($to_match, @cases) = @_; |
424 | my $default; |
425 | if (@cases % 2 != 0) { |
426 | $default = pop @cases; |
427 | (ref $default eq 'CODE') |
428 | || __PACKAGE__->_throw_error("Default case must be a CODE ref, not $default"); |
429 | } |
430 | while (@cases) { |
431 | my ($type, $action) = splice @cases, 0, 2; |
432 | |
433 | unless (blessed $type && $type->isa('Moose::Meta::TypeConstraint')) { |
434 | $type = find_or_parse_type_constraint($type) |
435 | || __PACKAGE__->_throw_error("Cannot find or parse the type '$type'") |
436 | } |
437 | |
438 | (ref $action eq 'CODE') |
439 | || __PACKAGE__->_throw_error("Match action must be a CODE ref, not $action"); |
440 | |
441 | if ($type->check($to_match)) { |
442 | local $_ = $to_match; |
443 | return $action->($to_match); |
444 | } |
445 | } |
1d39d709 |
446 | (defined $default) |
447 | || __PACKAGE__->_throw_error("No cases matched for $to_match"); |
0d29b772 |
448 | { |
449 | local $_ = $to_match; |
1d39d709 |
450 | return $default->($to_match); |
0d29b772 |
451 | } |
452 | } |
453 | |
454 | |
d9b40005 |
455 | ## -------------------------------------------------------- |
456 | ## desugaring functions ... |
457 | ## -------------------------------------------------------- |
458 | |
e85d2a5d |
459 | sub _create_type_constraint ($$$;$$) { |
9a63faba |
460 | my $name = shift; |
461 | my $parent = shift; |
462 | my $check = shift; |
463 | my $message = shift; |
464 | my $optimized = shift; |
4e36cf24 |
465 | my $inlined = shift; |
d9b40005 |
466 | |
9a63faba |
467 | my $pkg_defined_in = scalar( caller(1) ); |
e85d2a5d |
468 | |
1da6728b |
469 | if ( defined $name ) { |
d9b40005 |
470 | my $type = $REGISTRY->get_type_constraint($name); |
e85d2a5d |
471 | |
5f223879 |
472 | ( $type->_package_defined_in eq $pkg_defined_in ) |
473 | || _confess( |
474 | "The type constraint '$name' has already been created in " |
475 | . $type->_package_defined_in |
476 | . " and cannot be created again in " |
477 | . $pkg_defined_in ) |
478 | if defined $type; |
eee1a213 |
479 | |
480 | $name =~ /^[\w:\.]+$/ |
481 | or die qq{$name contains invalid characters for a type name.} |
33c8a6d0 |
482 | . qq{ Names can contain alphanumeric character, ":", and "."\n}; |
e85d2a5d |
483 | } |
1da6728b |
484 | |
9ceb576e |
485 | my %opts = ( |
9a63faba |
486 | name => $name, |
d9b40005 |
487 | package_defined_in => $pkg_defined_in, |
e85d2a5d |
488 | |
1da6728b |
489 | ( $check ? ( constraint => $check ) : () ), |
490 | ( $message ? ( message => $message ) : () ), |
491 | ( $optimized ? ( optimized => $optimized ) : () ), |
4e36cf24 |
492 | ( $inlined ? ( inlined => $inlined ) : () ), |
d9b40005 |
493 | ); |
1da6728b |
494 | |
9ceb576e |
495 | my $constraint; |
180899ed |
496 | if ( |
497 | defined $parent |
1da6728b |
498 | and $parent |
180899ed |
499 | = blessed $parent |
500 | ? $parent |
501 | : find_or_create_isa_type_constraint($parent) |
502 | ) { |
85a9908f |
503 | $constraint = $parent->create_child_type(%opts); |
1da6728b |
504 | } |
505 | else { |
506 | $constraint = Moose::Meta::TypeConstraint->new(%opts); |
4ab662d6 |
507 | } |
d9b40005 |
508 | |
509 | $REGISTRY->add_type_constraint($constraint) |
510 | if defined $name; |
511 | |
512 | return $constraint; |
513 | } |
514 | |
e85d2a5d |
515 | sub _install_type_coercions ($$) { |
180899ed |
516 | my ( $type_name, $coercion_map ) = @_; |
e606ae5f |
517 | my $type = find_type_constraint($type_name); |
180899ed |
518 | ( defined $type ) |
519 | || __PACKAGE__->_throw_error( |
a885c019 |
520 | "Cannot find type '$type_name', perhaps you forgot to load it"); |
180899ed |
521 | if ( $type->has_coercion ) { |
41e007e4 |
522 | $type->coercion->add_type_coercions(@$coercion_map); |
523 | } |
524 | else { |
525 | my $type_coercion = Moose::Meta::TypeCoercion->new( |
526 | type_coercion_map => $coercion_map, |
527 | type_constraint => $type |
528 | ); |
529 | $type->coercion($type_coercion); |
530 | } |
d9b40005 |
531 | } |
532 | |
533 | ## -------------------------------------------------------- |
f1917f58 |
534 | ## type notation parsing ... |
535 | ## -------------------------------------------------------- |
536 | |
537 | { |
180899ed |
538 | |
e85d2a5d |
539 | # All I have to say is mugwump++ cause I know |
540 | # do not even have enough regexp-fu to be able |
541 | # to have written this (I can only barely |
f1917f58 |
542 | # understand it as it is) |
e85d2a5d |
543 | # - SL |
544 | |
f1917f58 |
545 | use re "eval"; |
546 | |
eee1a213 |
547 | my $valid_chars = qr{[\w:\.]}; |
68d5a469 |
548 | my $type_atom = qr{ (?>$valid_chars+) }x; |
68113f48 |
549 | my $ws = qr{ (?>\s*) }x; |
550 | my $op_union = qr{ $ws \| $ws }x; |
551 | |
552 | my ($type, $type_capture_parts, $type_with_parameter, $union, $any); |
553 | if (Class::MOP::IS_RUNNING_ON_5_10) { |
554 | my $type_pattern |
555 | = q{ (?&type_atom) (?: \[ (?&ws) (?&any) (?&ws) \] )? }; |
556 | my $type_capture_parts_pattern |
557 | = q{ ((?&type_atom)) (?: \[ (?&ws) ((?&any)) (?&ws) \] )? }; |
558 | my $type_with_parameter_pattern |
559 | = q{ (?&type_atom) \[ (?&ws) (?&any) (?&ws) \] }; |
560 | my $union_pattern |
561 | = q{ (?&type) (?> (?: (?&op_union) (?&type) )+ ) }; |
562 | my $any_pattern |
563 | = q{ (?&type) | (?&union) }; |
564 | |
565 | my $defines = qr{(?(DEFINE) |
566 | (?<valid_chars> $valid_chars) |
567 | (?<type_atom> $type_atom) |
568 | (?<ws> $ws) |
569 | (?<op_union> $op_union) |
570 | (?<type> $type_pattern) |
571 | (?<type_capture_parts> $type_capture_parts_pattern) |
572 | (?<type_with_parameter> $type_with_parameter_pattern) |
573 | (?<union> $union_pattern) |
574 | (?<any> $any_pattern) |
575 | )}x; |
576 | |
577 | $type = qr{ $type_pattern $defines }x; |
578 | $type_capture_parts = qr{ $type_capture_parts_pattern $defines }x; |
579 | $type_with_parameter = qr{ $type_with_parameter_pattern $defines }x; |
580 | $union = qr{ $union_pattern $defines }x; |
581 | $any = qr{ $any_pattern $defines }x; |
582 | } |
583 | else { |
584 | $type |
585 | = qr{ $type_atom (?: \[ $ws (??{$any}) $ws \] )? }x; |
586 | $type_capture_parts |
587 | = qr{ ($type_atom) (?: \[ $ws ((??{$any})) $ws \] )? }x; |
588 | $type_with_parameter |
589 | = qr{ $type_atom \[ $ws (??{$any}) $ws \] }x; |
590 | $union |
591 | = qr{ $type (?> (?: $op_union $type )+ ) }x; |
592 | $any |
593 | = qr{ $type | $union }x; |
594 | } |
f1917f58 |
595 | |
f1917f58 |
596 | |
0fbd4b0a |
597 | sub _parse_parameterized_type_constraint { |
180899ed |
598 | { no warnings 'void'; $any; } # force capture of interpolated lexical |
84a9c64c |
599 | $_[0] =~ m{ $type_capture_parts }x; |
180899ed |
600 | return ( $1, $2 ); |
f1917f58 |
601 | } |
602 | |
0fbd4b0a |
603 | sub _detect_parameterized_type_constraint { |
180899ed |
604 | { no warnings 'void'; $any; } # force capture of interpolated lexical |
e85d2a5d |
605 | $_[0] =~ m{ ^ $type_with_parameter $ }x; |
f1917f58 |
606 | } |
607 | |
608 | sub _parse_type_constraint_union { |
180899ed |
609 | { no warnings 'void'; $any; } # force capture of interpolated lexical |
e85d2a5d |
610 | my $given = shift; |
611 | my @rv; |
612 | while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) { |
82a5b1a7 |
613 | push @rv => $1; |
e85d2a5d |
614 | } |
180899ed |
615 | ( pos($given) eq length($given) ) |
616 | || __PACKAGE__->_throw_error( "'$given' didn't parse (parse-pos=" |
617 | . pos($given) |
618 | . " and str-length=" |
619 | . length($given) |
620 | . ")" ); |
e85d2a5d |
621 | @rv; |
f1917f58 |
622 | } |
623 | |
624 | sub _detect_type_constraint_union { |
180899ed |
625 | { no warnings 'void'; $any; } # force capture of interpolated lexical |
e85d2a5d |
626 | $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x; |
f1917f58 |
627 | } |
628 | } |
629 | |
630 | ## -------------------------------------------------------- |
d9b40005 |
631 | # define some basic built-in types |
632 | ## -------------------------------------------------------- |
a15dff8d |
633 | |
06d02aac |
634 | # By making these classes immutable before creating all the types in |
635 | # Moose::Util::TypeConstraints::Builtin , we avoid repeatedly calling the slow |
636 | # MOP-based accessors. |
3cae4250 |
637 | $_->make_immutable( |
638 | inline_constructor => 1, |
639 | constructor_name => "_new", |
640 | |
641 | # these are Class::MOP accessors, so they need inlining |
642 | inline_accessors => 1 |
643 | ) for grep { $_->is_mutable } |
37edf27e |
644 | map { Class::MOP::class_of($_) } |
3cae4250 |
645 | qw( |
646 | Moose::Meta::TypeConstraint |
647 | Moose::Meta::TypeConstraint::Union |
648 | Moose::Meta::TypeConstraint::Parameterized |
649 | Moose::Meta::TypeConstraint::Parameterizable |
650 | Moose::Meta::TypeConstraint::Class |
651 | Moose::Meta::TypeConstraint::Role |
652 | Moose::Meta::TypeConstraint::Enum |
0a6bff54 |
653 | Moose::Meta::TypeConstraint::DuckType |
3cae4250 |
654 | Moose::Meta::TypeConstraint::Registry |
655 | ); |
656 | |
06d02aac |
657 | require Moose::Util::TypeConstraints::Builtins; |
658 | Moose::Util::TypeConstraints::Builtins::define_builtins($REGISTRY); |
7e4e1ad4 |
659 | |
180899ed |
660 | my @PARAMETERIZABLE_TYPES |
2c29c0e7 |
661 | = map { $REGISTRY->get_type_constraint($_) } qw[ScalarRef ArrayRef HashRef Maybe]; |
180899ed |
662 | |
663 | sub get_all_parameterizable_types {@PARAMETERIZABLE_TYPES} |
7e4e1ad4 |
664 | |
4ab662d6 |
665 | sub add_parameterizable_type { |
7e4e1ad4 |
666 | my $type = shift; |
180899ed |
667 | ( blessed $type |
668 | && $type->isa('Moose::Meta::TypeConstraint::Parameterizable') ) |
669 | || __PACKAGE__->_throw_error( |
670 | "Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type" |
671 | ); |
7e4e1ad4 |
672 | push @PARAMETERIZABLE_TYPES => $type; |
4ab662d6 |
673 | } |
7e4e1ad4 |
674 | |
675 | ## -------------------------------------------------------- |
d9b40005 |
676 | # end of built-in types ... |
677 | ## -------------------------------------------------------- |
678 | |
943596a6 |
679 | { |
680 | my @BUILTINS = list_all_type_constraints(); |
180899ed |
681 | sub list_all_builtin_type_constraints {@BUILTINS} |
943596a6 |
682 | } |
683 | |
6ea98933 |
684 | sub _throw_error { |
6b83828f |
685 | shift; |
6ea98933 |
686 | require Moose; |
687 | unshift @_, 'Moose'; |
688 | goto &Moose::throw_error; |
689 | } |
690 | |
a15dff8d |
691 | 1; |
692 | |
ad46f524 |
693 | # ABSTRACT: Type constraint system for Moose |
694 | |
a15dff8d |
695 | __END__ |
696 | |
697 | =pod |
698 | |
a15dff8d |
699 | =head1 SYNOPSIS |
700 | |
701 | use Moose::Util::TypeConstraints; |
702 | |
04eec387 |
703 | subtype 'Natural', |
704 | as 'Int', |
705 | where { $_ > 0 }; |
e85d2a5d |
706 | |
04eec387 |
707 | subtype 'NaturalLessThanTen', |
708 | as 'Natural', |
709 | where { $_ < 10 }, |
710 | message { "This number ($_) is not less than ten!" }; |
e85d2a5d |
711 | |
04eec387 |
712 | coerce 'Num', |
713 | from 'Str', |
714 | via { 0+$_ }; |
e85d2a5d |
715 | |
04eec387 |
716 | enum 'RGBColors', [qw(red green blue)]; |
a15dff8d |
717 | |
e7fcb7b2 |
718 | no Moose::Util::TypeConstraints; |
719 | |
a15dff8d |
720 | =head1 DESCRIPTION |
721 | |
e85d2a5d |
722 | This module provides Moose with the ability to create custom type |
6549b0d1 |
723 | constraints to be used in attribute definition. |
e522431d |
724 | |
6ba6d68c |
725 | =head2 Important Caveat |
726 | |
e85d2a5d |
727 | This is B<NOT> a type system for Perl 5. These are type constraints, |
728 | and they are not used by Moose unless you tell it to. No type |
e7fcb7b2 |
729 | inference is performed, expressions are not typed, etc. etc. etc. |
6ba6d68c |
730 | |
e7fcb7b2 |
731 | A type constraint is at heart a small "check if a value is valid" |
732 | function. A constraint can be associated with an attribute. This |
733 | simplifies parameter validation, and makes your code clearer to read, |
734 | because you can refer to constraints by name. |
6ba6d68c |
735 | |
2c0cbef7 |
736 | =head2 Slightly Less Important Caveat |
737 | |
e7fcb7b2 |
738 | It is B<always> a good idea to quote your type names. |
004222dc |
739 | |
e7fcb7b2 |
740 | This prevents Perl from trying to execute the call as an indirect |
741 | object call. This can be an issue when you have a subtype with the |
742 | same name as a valid class. |
2c0cbef7 |
743 | |
e7fcb7b2 |
744 | For instance: |
e85d2a5d |
745 | |
2c0cbef7 |
746 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
747 | |
e7fcb7b2 |
748 | will I<just work>, while this: |
2c0cbef7 |
749 | |
750 | use DateTime; |
751 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
752 | |
e85d2a5d |
753 | will fail silently and cause many headaches. The simple way to solve |
754 | this, as well as future proof your subtypes from classes which have |
e7fcb7b2 |
755 | yet to have been created, is to quote the type name: |
2c0cbef7 |
756 | |
757 | use DateTime; |
04eec387 |
758 | subtype 'DateTime', as 'Object', where { $_->isa('DateTime') }; |
2c0cbef7 |
759 | |
6ba6d68c |
760 | =head2 Default Type Constraints |
e522431d |
761 | |
e606ae5f |
762 | This module also provides a simple hierarchy for Perl 5 types, here is |
004222dc |
763 | that hierarchy represented visually. |
e522431d |
764 | |
765 | Any |
e85d2a5d |
766 | Item |
5a4c5493 |
767 | Bool |
7e4e1ad4 |
768 | Maybe[`a] |
f65cb534 |
769 | Undef |
770 | Defined |
5a4c5493 |
771 | Value |
5a4c5493 |
772 | Str |
f1bbe1e1 |
773 | Num |
774 | Int |
fcb5b0cd |
775 | ClassName |
776 | RoleName |
5a4c5493 |
777 | Ref |
2c29c0e7 |
778 | ScalarRef[`a] |
7e4e1ad4 |
779 | ArrayRef[`a] |
780 | HashRef[`a] |
5a4c5493 |
781 | CodeRef |
782 | RegexpRef |
3f7376b0 |
783 | GlobRef |
94ab1609 |
784 | FileHandle |
e85d2a5d |
785 | Object |
e522431d |
786 | |
4ab662d6 |
787 | B<NOTE:> Any type followed by a type parameter C<[`a]> can be |
7e4e1ad4 |
788 | parameterized, this means you can say: |
789 | |
757e07ef |
790 | ArrayRef[Int] # an array of integers |
7e4e1ad4 |
791 | HashRef[CodeRef] # a hash of str to CODE ref mappings |
2c29c0e7 |
792 | ScalarRef[Int] # a reference to an integer |
7e4e1ad4 |
793 | Maybe[Str] # value may be a string, may be undefined |
794 | |
4e8a0f64 |
795 | If Moose finds a name in brackets that it does not recognize as an |
796 | existing type, it assumes that this is a class name, for example |
797 | C<ArrayRef[DateTime]>. |
798 | |
e7fcb7b2 |
799 | B<NOTE:> Unless you parameterize a type, then it is invalid to include |
800 | the square brackets. I.e. C<ArrayRef[]> will be treated as a new type |
801 | name, I<not> as a parameterization of C<ArrayRef>. |
e606ae5f |
802 | |
4ab662d6 |
803 | B<NOTE:> The C<Undef> type constraint for the most part works |
804 | correctly now, but edge cases may still exist, please use it |
6549b0d1 |
805 | sparingly. |
703e92fb |
806 | |
7e4e1ad4 |
807 | B<NOTE:> The C<ClassName> type constraint does a complex package |
e7fcb7b2 |
808 | existence check. This means that your class B<must> be loaded for this |
809 | type constraint to pass. |
9af1d28b |
810 | |
e7fcb7b2 |
811 | B<NOTE:> The C<RoleName> constraint checks a string is a I<package |
4831e2de |
812 | name> which is a role, like C<'MyApp::Role::Comparable'>. |
ed87d4fd |
813 | |
e606ae5f |
814 | =head2 Type Constraint Naming |
004222dc |
815 | |
eee1a213 |
816 | Type name declared via this module can only contain alphanumeric |
817 | characters, colons (:), and periods (.). |
818 | |
e606ae5f |
819 | Since the types created by this module are global, it is suggested |
820 | that you namespace your types just as you would namespace your |
e7fcb7b2 |
821 | modules. So instead of creating a I<Color> type for your |
822 | B<My::Graphics> module, you would call the type |
823 | I<My::Graphics::Types::Color> instead. |
004222dc |
824 | |
703e92fb |
825 | =head2 Use with Other Constraint Modules |
826 | |
e7fcb7b2 |
827 | This module can play nicely with other constraint modules with some |
828 | slight tweaking. The C<where> clause in types is expected to be a |
69229b40 |
829 | C<CODE> reference which checks its first argument and returns a |
e7fcb7b2 |
830 | boolean. Since most constraint modules work in a similar way, it |
831 | should be simple to adapt them to work with Moose. |
703e92fb |
832 | |
e85d2a5d |
833 | For instance, this is how you could use it with |
834 | L<Declare::Constraints::Simple> to declare a completely new type. |
703e92fb |
835 | |
9e856c83 |
836 | type 'HashOfArrayOfObjects', |
04eec387 |
837 | where { |
838 | IsHashRef( |
839 | -keys => HasLength, |
840 | -values => IsArrayRef(IsObject) |
841 | )->(@_); |
842 | }; |
703e92fb |
843 | |
2c739d1a |
844 | For more examples see the F<t/examples/example_w_DCS.t> test |
e7fcb7b2 |
845 | file. |
703e92fb |
846 | |
69229b40 |
847 | Here is an example of using L<Test::Deep> and its non-test |
e85d2a5d |
848 | related C<eq_deeply> function. |
703e92fb |
849 | |
04eec387 |
850 | type 'ArrayOfHashOfBarsAndRandomNumbers', |
851 | where { |
e85d2a5d |
852 | eq_deeply($_, |
703e92fb |
853 | array_each(subhashof({ |
854 | bar => isa('Bar'), |
855 | random_number => ignore() |
e85d2a5d |
856 | }))) |
703e92fb |
857 | }; |
858 | |
e606ae5f |
859 | For a complete example see the |
2c739d1a |
860 | F<t/examples/example_w_TestDeep.t> test file. |
e85d2a5d |
861 | |
32549612 |
862 | =head2 Error messages |
863 | |
864 | Type constraints can also specify custom error messages, for when they fail to |
865 | validate. This is provided as just another coderef, which receives the invalid |
866 | value in C<$_>, as in: |
867 | |
868 | subtype 'PositiveInt', |
869 | as 'Int', |
870 | where { $_ > 0 }, |
871 | message { "$_ is not a positive integer!" }; |
872 | |
873 | If no message is specified, a default message will be used, which indicates |
874 | which type constraint was being used and what value failed. If |
875 | L<Devel::PartialDump> (version 0.14 or higher) is installed, it will be used to |
876 | display the invalid value, otherwise it will just be printed as is. |
877 | |
a15dff8d |
878 | =head1 FUNCTIONS |
879 | |
880 | =head2 Type Constraint Constructors |
881 | |
e7fcb7b2 |
882 | The following functions are used to create type constraints. They |
883 | will also register the type constraints your create in a global |
884 | registry that is used to look types up by name. |
a15dff8d |
885 | |
cec39889 |
886 | See the L</SYNOPSIS> for an example of how to use these. |
a15dff8d |
887 | |
6ba6d68c |
888 | =over 4 |
a15dff8d |
889 | |
04eec387 |
890 | =item B<< subtype 'Name', as 'Parent', where { } ... >> |
182134e8 |
891 | |
e85d2a5d |
892 | This creates a named subtype. |
d6e2d9a1 |
893 | |
dba9208a |
894 | If you provide a parent that Moose does not recognize, it will |
895 | automatically create a new class type constraint for this name. |
896 | |
9e856c83 |
897 | When creating a named type, the C<subtype> function should either be |
898 | called with the sugar helpers (C<where>, C<message>, etc), or with a |
899 | name and a hashref of parameters: |
900 | |
901 | subtype( 'Foo', { where => ..., message => ... } ); |
902 | |
903 | The valid hashref keys are C<as> (the parent), C<where>, C<message>, |
904 | and C<optimize_as>. |
9a63faba |
905 | |
04eec387 |
906 | =item B<< subtype as 'Parent', where { } ... >> |
182134e8 |
907 | |
e85d2a5d |
908 | This creates an unnamed subtype and will return the type |
909 | constraint meta-object, which will be an instance of |
910 | L<Moose::Meta::TypeConstraint>. |
a15dff8d |
911 | |
9e856c83 |
912 | When creating an anonymous type, the C<subtype> function should either |
913 | be called with the sugar helpers (C<where>, C<message>, etc), or with |
914 | just a hashref of parameters: |
915 | |
916 | subtype( { where => ..., message => ... } ); |
917 | |
620db045 |
918 | =item B<class_type ($class, ?$options)> |
3fef8ce8 |
919 | |
ed87d4fd |
920 | Creates a new subtype of C<Object> with the name C<$class> and the |
921 | metaclass L<Moose::Meta::TypeConstraint::Class>. |
3fef8ce8 |
922 | |
620db045 |
923 | =item B<role_type ($role, ?$options)> |
924 | |
ed87d4fd |
925 | Creates a C<Role> type constraint with the name C<$role> and the |
926 | metaclass L<Moose::Meta::TypeConstraint::Role>. |
620db045 |
927 | |
1b2c9bda |
928 | =item B<maybe_type ($type)> |
929 | |
930 | Creates a type constraint for either C<undef> or something of the |
931 | given type. |
932 | |
bce5d4a5 |
933 | =item B<duck_type ($name, \@methods)> |
e451e855 |
934 | |
88b68372 |
935 | This will create a subtype of Object and test to make sure the value |
bce5d4a5 |
936 | C<can()> do the methods in C<\@methods>. |
88b68372 |
937 | |
938 | This is intended as an easy way to accept non-Moose objects that |
939 | provide a certain interface. If you're using Moose classes, we |
940 | recommend that you use a C<requires>-only Role instead. |
e451e855 |
941 | |
942 | =item B<duck_type (\@methods)> |
943 | |
bce5d4a5 |
944 | If passed an ARRAY reference as the only parameter instead of the |
945 | C<$name>, C<\@methods> pair, this will create an unnamed duck type. |
946 | This can be used in an attribute definition like so: |
e451e855 |
947 | |
88b68372 |
948 | has 'cache' => ( |
949 | is => 'ro', |
950 | isa => duck_type( [qw( get_set )] ), |
951 | ); |
e451e855 |
952 | |
bce5d4a5 |
953 | =item B<enum ($name, \@values)> |
fcec2383 |
954 | |
e85d2a5d |
955 | This will create a basic subtype for a given set of strings. |
956 | The resulting constraint will be a subtype of C<Str> and |
bce5d4a5 |
957 | will match any of the items in C<\@values>. It is case sensitive. |
cec39889 |
958 | See the L</SYNOPSIS> for a simple example. |
2c0cbef7 |
959 | |
6549b0d1 |
960 | B<NOTE:> This is not a true proper enum type, it is simply |
961 | a convenient constraint builder. |
2c0cbef7 |
962 | |
9f4334a1 |
963 | =item B<enum (\@values)> |
964 | |
bce5d4a5 |
965 | If passed an ARRAY reference as the only parameter instead of the |
966 | C<$name>, C<\@values> pair, this will create an unnamed enum. This |
967 | can then be used in an attribute definition like so: |
9f4334a1 |
968 | |
969 | has 'sort_order' => ( |
970 | is => 'ro', |
4ab662d6 |
971 | isa => enum([qw[ ascending descending ]]), |
9f4334a1 |
972 | ); |
973 | |
e7fcb7b2 |
974 | =item B<as 'Parent'> |
a15dff8d |
975 | |
6ba6d68c |
976 | This is just sugar for the type constraint construction syntax. |
a15dff8d |
977 | |
e7fcb7b2 |
978 | It takes a single argument, which is the name of a parent type. |
979 | |
980 | =item B<where { ... }> |
a15dff8d |
981 | |
6ba6d68c |
982 | This is just sugar for the type constraint construction syntax. |
76d37e5a |
983 | |
e7fcb7b2 |
984 | It takes a subroutine reference as an argument. When the type |
985 | constraint is tested, the reference is run with the value to be tested |
986 | in C<$_>. This reference should return true or false to indicate |
987 | whether or not the constraint check passed. |
e606ae5f |
988 | |
e7fcb7b2 |
989 | =item B<message { ... }> |
76d37e5a |
990 | |
991 | This is just sugar for the type constraint construction syntax. |
a15dff8d |
992 | |
e7fcb7b2 |
993 | It takes a subroutine reference as an argument. When the type |
994 | constraint fails, then the code block is run with the value provided |
995 | in C<$_>. This reference should return a string, which will be used in |
996 | the text of the exception thrown. |
e606ae5f |
997 | |
7142d232 |
998 | =item B<inline_as { ... }> |
999 | |
1000 | This can be used to define a "hand optimized" inlinable version of your type |
1001 | constraint. |
1002 | |
1003 | You provide a subroutine which will be called I<as a method> on a |
1004 | L<Moose::Meta::TypeConstraint> object. It will receive a single parameter, the |
1005 | name of the variable to check, typically something like C<"$_"> or C<"$_[0]">. |
1006 | |
1007 | The subroutine should return a code string suitable for inlining. You can |
297899d1 |
1008 | assume that the check will be wrapped in parentheses when it is inlined. |
7142d232 |
1009 | |
01062d8a |
1010 | The inlined code should include any checks that your type's parent types |
0578d5ce |
1011 | do. For example, the C<Value> type's inlining sub looks like this: |
7142d232 |
1012 | |
1013 | sub { |
0578d5ce |
1014 | 'defined(' . $_[1] . ')' |
1015 | . ' && !ref(' . $_[1] . ')' |
7142d232 |
1016 | } |
1017 | |
0578d5ce |
1018 | Note that it checks if the variable is defined, since it is a subtype of |
1019 | the C<Defined> type. However, to avoid repeating code, this can be optimized as: |
1020 | |
1021 | sub { |
1022 | $_[0]->parent()->_inline_check($_[1]) |
1023 | . ' && !ref(' . $_[1] . ')' |
1024 | } |
7142d232 |
1025 | |
e7fcb7b2 |
1026 | =item B<optimize_as { ... }> |
8ecb1fa0 |
1027 | |
7142d232 |
1028 | B<This feature is deprecated, use C<inline_as> instead.> |
1029 | |
e85d2a5d |
1030 | This can be used to define a "hand optimized" version of your |
d44714be |
1031 | type constraint which can be used to avoid traversing a subtype |
6549b0d1 |
1032 | constraint hierarchy. |
d44714be |
1033 | |
b0f8f0ec |
1034 | B<NOTE:> You should only use this if you know what you are doing. |
1035 | All the built in types use this, so your subtypes (assuming they |
d44714be |
1036 | are shallow) will not likely need to use this. |
1037 | |
04eec387 |
1038 | =item B<< type 'Name', where { } ... >> |
e7fcb7b2 |
1039 | |
1040 | This creates a base type, which has no parent. |
1041 | |
1042 | The C<type> function should either be called with the sugar helpers |
1043 | (C<where>, C<message>, etc), or with a name and a hashref of |
1044 | parameters: |
1045 | |
1046 | type( 'Foo', { where => ..., message => ... } ); |
1047 | |
7142d232 |
1048 | The valid hashref keys are C<where>, C<message>, and C<inlined_as>. |
e7fcb7b2 |
1049 | |
6ba6d68c |
1050 | =back |
a15dff8d |
1051 | |
0d29b772 |
1052 | =head2 Type Constraint Utilities |
1053 | |
1054 | =over 4 |
1055 | |
1056 | =item B<< match_on_type $value => ( $type => \&action, ... ?\&default ) >> |
1057 | |
1a15f4a8 |
1058 | This is a utility function for doing simple type based dispatching similar to |
2ae1457e |
1059 | match/case in OCaml and case/of in Haskell. It is not as featureful as those |
1a15f4a8 |
1060 | languages, nor does not it support any kind of automatic destructuring |
1061 | bind. Here is a simple Perl pretty printer dispatching over the core Moose |
1062 | types. |
0d29b772 |
1063 | |
1064 | sub ppprint { |
1065 | my $x = shift; |
1a15f4a8 |
1066 | match_on_type $x => ( |
1067 | HashRef => sub { |
0d29b772 |
1068 | my $hash = shift; |
1a15f4a8 |
1069 | '{ ' |
1070 | . ( |
1071 | join ", " => map { $_ . ' => ' . ppprint( $hash->{$_} ) } |
1072 | sort keys %$hash |
1073 | ) . ' }'; |
1074 | }, |
1075 | ArrayRef => sub { |
0d29b772 |
1076 | my $array = shift; |
1a15f4a8 |
1077 | '[ ' . ( join ", " => map { ppprint($_) } @$array ) . ' ]'; |
1078 | }, |
1079 | CodeRef => sub {'sub { ... }'}, |
1080 | RegexpRef => sub { 'qr/' . $_ . '/' }, |
1081 | GlobRef => sub { '*' . B::svref_2object($_)->NAME }, |
0d29b772 |
1082 | Object => sub { $_->can('to_string') ? $_->to_string : $_ }, |
1a15f4a8 |
1083 | ScalarRef => sub { '\\' . ppprint( ${$_} ) }, |
1084 | Num => sub {$_}, |
1085 | Str => sub { '"' . $_ . '"' }, |
1086 | Undef => sub {'undef'}, |
1087 | => sub { die "I don't know what $_ is" } |
1088 | ); |
0d29b772 |
1089 | } |
1090 | |
e7597637 |
1091 | Or a simple JSON serializer: |
1092 | |
1093 | sub to_json { |
1094 | my $x = shift; |
1a15f4a8 |
1095 | match_on_type $x => ( |
1096 | HashRef => sub { |
e7597637 |
1097 | my $hash = shift; |
1a15f4a8 |
1098 | '{ ' |
1099 | . ( |
1100 | join ", " => |
1101 | map { '"' . $_ . '" : ' . to_json( $hash->{$_} ) } |
1102 | sort keys %$hash |
1103 | ) . ' }'; |
1104 | }, |
1105 | ArrayRef => sub { |
e7597637 |
1106 | my $array = shift; |
1a15f4a8 |
1107 | '[ ' . ( join ", " => map { to_json($_) } @$array ) . ' ]'; |
1108 | }, |
1109 | Num => sub {$_}, |
1110 | Str => sub { '"' . $_ . '"' }, |
1111 | Undef => sub {'null'}, |
1112 | => sub { die "$_ is not acceptable json type" } |
1113 | ); |
e7597637 |
1114 | } |
1115 | |
1a15f4a8 |
1116 | The matcher is done by mapping a C<$type> to an C<\&action>. The C<$type> can |
1117 | be either a string type or a L<Moose::Meta::TypeConstraint> object, and |
1118 | C<\&action> is a subroutine reference. This function will dispatch on the |
1119 | first match for C<$value>. It is possible to have a catch-all by providing an |
1120 | additional subroutine reference as the final argument to C<match_on_type>. |
0d29b772 |
1121 | |
1122 | =back |
1123 | |
6ba6d68c |
1124 | =head2 Type Coercion Constructors |
a15dff8d |
1125 | |
e7fcb7b2 |
1126 | You can define coercions for type constraints, which allow you to |
1127 | automatically transform values to something valid for the type |
1128 | constraint. If you ask your accessor to coerce, then Moose will run |
1129 | the type-coercion code first, followed by the type constraint |
1130 | check. This feature should be used carefully as it is very powerful |
1131 | and could easily take off a limb if you are not careful. |
a15dff8d |
1132 | |
cec39889 |
1133 | See the L</SYNOPSIS> for an example of how to use these. |
a15dff8d |
1134 | |
6ba6d68c |
1135 | =over 4 |
a15dff8d |
1136 | |
04eec387 |
1137 | =item B<< coerce 'Name', from 'OtherName', via { ... } >> |
a15dff8d |
1138 | |
e7fcb7b2 |
1139 | This defines a coercion from one type to another. The C<Name> argument |
1140 | is the type you are coercing I<to>. |
1141 | |
f55dd47f |
1142 | To define multiple coercions, supply more sets of from/via pairs: |
1143 | |
04eec387 |
1144 | coerce 'Name', |
1145 | from 'OtherName', via { ... }, |
1146 | from 'ThirdName', via { ... }; |
f55dd47f |
1147 | |
e7fcb7b2 |
1148 | =item B<from 'OtherName'> |
a15dff8d |
1149 | |
6ba6d68c |
1150 | This is just sugar for the type coercion construction syntax. |
1151 | |
e7fcb7b2 |
1152 | It takes a single type name (or type object), which is the type being |
1153 | coerced I<from>. |
1154 | |
1155 | =item B<via { ... }> |
a15dff8d |
1156 | |
6ba6d68c |
1157 | This is just sugar for the type coercion construction syntax. |
a15dff8d |
1158 | |
e7fcb7b2 |
1159 | It takes a subroutine reference. This reference will be called with |
1160 | the value to be coerced in C<$_>. It is expected to return a new value |
1161 | of the proper type for the coercion. |
1162 | |
a15dff8d |
1163 | =back |
1164 | |
e7fcb7b2 |
1165 | =head2 Creating and Finding Type Constraints |
1166 | |
1167 | These are additional functions for creating and finding type |
1168 | constraints. Most of these functions are not available for |
1169 | importing. The ones that are importable as specified. |
004222dc |
1170 | |
1171 | =over 4 |
1172 | |
e7fcb7b2 |
1173 | =item B<find_type_constraint($type_name)> |
eb4c4e82 |
1174 | |
e7fcb7b2 |
1175 | This function can be used to locate the L<Moose::Meta::TypeConstraint> |
1176 | object for a named type. |
eb4c4e82 |
1177 | |
e7fcb7b2 |
1178 | This function is importable. |
004222dc |
1179 | |
e7fcb7b2 |
1180 | =item B<register_type_constraint($type_object)> |
004222dc |
1181 | |
e7fcb7b2 |
1182 | This function will register a L<Moose::Meta::TypeConstraint> with the |
1183 | global type registry. |
004222dc |
1184 | |
e7fcb7b2 |
1185 | This function is importable. |
004222dc |
1186 | |
e7fcb7b2 |
1187 | =item B<normalize_type_constraint_name($type_constraint_name)> |
004222dc |
1188 | |
e7fcb7b2 |
1189 | This method takes a type constraint name and returns the normalized |
1190 | form. This removes any whitespace in the string. |
004222dc |
1191 | |
e7fcb7b2 |
1192 | =item B<create_type_constraint_union($pipe_separated_types | @type_constraint_names)> |
004222dc |
1193 | |
e7fcb7b2 |
1194 | This can take a union type specification like C<'Int|ArrayRef[Int]'>, |
1195 | or a list of names. It returns a new |
1196 | L<Moose::Meta::TypeConstraint::Union> object. |
004222dc |
1197 | |
e7fcb7b2 |
1198 | =item B<create_parameterized_type_constraint($type_name)> |
620db045 |
1199 | |
e7fcb7b2 |
1200 | Given a C<$type_name> in the form of C<'BaseType[ContainerType]'>, |
1201 | this will create a new L<Moose::Meta::TypeConstraint::Parameterized> |
1202 | object. The C<BaseType> must exist already exist as a parameterizable |
1203 | type. |
620db045 |
1204 | |
e7fcb7b2 |
1205 | =item B<create_class_type_constraint($class, $options)> |
dabed765 |
1206 | |
e7fcb7b2 |
1207 | Given a class name this function will create a new |
1208 | L<Moose::Meta::TypeConstraint::Class> object for that class name. |
004222dc |
1209 | |
e7fcb7b2 |
1210 | The C<$options> is a hash reference that will be passed to the |
1211 | L<Moose::Meta::TypeConstraint::Class> constructor (as a hash). |
620db045 |
1212 | |
e7fcb7b2 |
1213 | =item B<create_role_type_constraint($role, $options)> |
620db045 |
1214 | |
e7fcb7b2 |
1215 | Given a role name this function will create a new |
1216 | L<Moose::Meta::TypeConstraint::Role> object for that role name. |
620db045 |
1217 | |
e7fcb7b2 |
1218 | The C<$options> is a hash reference that will be passed to the |
1219 | L<Moose::Meta::TypeConstraint::Role> constructor (as a hash). |
620db045 |
1220 | |
8a6c8c47 |
1221 | =item B<create_enum_type_constraint($name, $values)> |
1222 | |
1223 | Given a enum name this function will create a new |
1224 | L<Moose::Meta::TypeConstraint::Enum> object for that enum name. |
1225 | |
0a6bff54 |
1226 | =item B<create_duck_type_constraint($name, $methods)> |
1227 | |
1228 | Given a duck type name this function will create a new |
1229 | L<Moose::Meta::TypeConstraint::DuckType> object for that enum name. |
1230 | |
e7fcb7b2 |
1231 | =item B<find_or_parse_type_constraint($type_name)> |
620db045 |
1232 | |
ec4b72d2 |
1233 | Given a type name, this first attempts to find a matching constraint |
e7fcb7b2 |
1234 | in the global registry. |
620db045 |
1235 | |
e7fcb7b2 |
1236 | If the type name is a union or parameterized type, it will create a |
1237 | new object of the appropriate, but if given a "regular" type that does |
1238 | not yet exist, it simply returns false. |
620db045 |
1239 | |
e7fcb7b2 |
1240 | When given a union or parameterized type, the member or base type must |
1241 | already exist. |
620db045 |
1242 | |
e7fcb7b2 |
1243 | If it creates a new union or parameterized type, it will add it to the |
1244 | global registry. |
004222dc |
1245 | |
e7fcb7b2 |
1246 | =item B<find_or_create_isa_type_constraint($type_name)> |
004222dc |
1247 | |
e7fcb7b2 |
1248 | =item B<find_or_create_does_type_constraint($type_name)> |
004222dc |
1249 | |
e7fcb7b2 |
1250 | These functions will first call C<find_or_parse_type_constraint>. If |
72042ad7 |
1251 | that function does not return a type, a new type object will |
e7fcb7b2 |
1252 | be created. |
004222dc |
1253 | |
e7fcb7b2 |
1254 | The C<isa> variant will use C<create_class_type_constraint> and the |
1255 | C<does> variant will use C<create_role_type_constraint>. |
004222dc |
1256 | |
1257 | =item B<get_type_constraint_registry> |
1258 | |
e7fcb7b2 |
1259 | Returns the L<Moose::Meta::TypeConstraint::Registry> object which |
004222dc |
1260 | keeps track of all type constraints. |
1261 | |
1262 | =item B<list_all_type_constraints> |
1263 | |
e7fcb7b2 |
1264 | This will return a list of type constraint names in the global |
1265 | registry. You can then fetch the actual type object using |
1266 | C<find_type_constraint($type_name)>. |
004222dc |
1267 | |
1268 | =item B<list_all_builtin_type_constraints> |
1269 | |
e7fcb7b2 |
1270 | This will return a list of builtin type constraints, meaning those |
1271 | which are defined in this module. See the L<Default Type Constraints> |
1272 | section for a complete list. |
004222dc |
1273 | |
1274 | =item B<export_type_constraints_as_functions> |
1275 | |
e7fcb7b2 |
1276 | This will export all the current type constraints as functions into |
1277 | the caller's namespace (C<Int()>, C<Str()>, etc). Right now, this is |
1278 | mostly used for testing, but it might prove useful to others. |
004222dc |
1279 | |
1280 | =item B<get_all_parameterizable_types> |
1281 | |
e7fcb7b2 |
1282 | This returns all the parameterizable types that have been registered, |
1283 | as a list of type objects. |
004222dc |
1284 | |
e7fcb7b2 |
1285 | =item B<add_parameterizable_type($type)> |
004222dc |
1286 | |
1287 | Adds C<$type> to the list of parameterizable types |
1288 | |
1289 | =back |
1290 | |
a15dff8d |
1291 | =head1 BUGS |
1292 | |
d4048ef3 |
1293 | See L<Moose/BUGS> for details on reporting bugs. |
a15dff8d |
1294 | |
81dc201f |
1295 | =cut |