Commit | Line | Data |
a15dff8d |
1 | |
2 | package Moose::Util::TypeConstraints; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
e90c03d0 |
7 | use Carp 'confess'; |
86629f93 |
8 | use Scalar::Util 'blessed', 'reftype'; |
571dd39f |
9 | use Sub::Exporter; |
a15dff8d |
10 | |
9f4334a1 |
11 | our $VERSION = '0.22'; |
d44714be |
12 | our $AUTHORITY = 'cpan:STEVAN'; |
a15dff8d |
13 | |
d9b40005 |
14 | ## -------------------------------------------------------- |
e85d2a5d |
15 | # Prototyped subs must be predeclared because we have a |
16 | # circular dependency with Moose::Meta::Attribute et. al. |
17 | # so in case of us being use'd first the predeclaration |
d9b40005 |
18 | # ensures the prototypes are in scope when consumers are |
19 | # compiled. |
20 | |
21 | # creation and location |
0fbd4b0a |
22 | sub find_type_constraint ($); |
3fef8ce8 |
23 | sub register_type_constraint ($); |
0fbd4b0a |
24 | sub find_or_create_type_constraint ($;$); |
25 | sub create_type_constraint_union (@); |
26 | sub create_parameterized_type_constraint ($); |
4ab662d6 |
27 | sub create_class_type_constraint ($;$); |
28 | #sub create_class_type_constraint ($); |
d9b40005 |
29 | |
30 | # dah sugah! |
31 | sub type ($$;$$); |
32 | sub subtype ($$;$$$); |
4ab662d6 |
33 | sub class_type ($;$); |
d9b40005 |
34 | sub coerce ($@); |
35 | sub as ($); |
36 | sub from ($); |
37 | sub where (&); |
38 | sub via (&); |
39 | sub message (&); |
40 | sub optimize_as (&); |
41 | sub enum ($;@); |
42 | |
e85d2a5d |
43 | ## private stuff ... |
d9b40005 |
44 | sub _create_type_constraint ($$$;$$); |
45 | sub _install_type_coercions ($$); |
46 | |
47 | ## -------------------------------------------------------- |
8c4acc60 |
48 | |
4e036ee4 |
49 | use Moose::Meta::TypeConstraint; |
3726f905 |
50 | use Moose::Meta::TypeConstraint::Union; |
0fbd4b0a |
51 | use Moose::Meta::TypeConstraint::Parameterized; |
7e4e1ad4 |
52 | use Moose::Meta::TypeConstraint::Parameterizable; |
2ca63f5d |
53 | use Moose::Meta::TypeCoercion; |
3726f905 |
54 | use Moose::Meta::TypeCoercion::Union; |
22aed3c0 |
55 | use Moose::Meta::TypeConstraint::Registry; |
28ffb449 |
56 | use Moose::Util::TypeConstraints::OptimizedConstraints; |
4e036ee4 |
57 | |
571dd39f |
58 | my @exports = qw/ |
3fef8ce8 |
59 | type subtype class_type as where message optimize_as |
e85d2a5d |
60 | coerce from via |
571dd39f |
61 | enum |
62 | find_type_constraint |
3fef8ce8 |
63 | register_type_constraint |
571dd39f |
64 | /; |
65 | |
e85d2a5d |
66 | Sub::Exporter::setup_exporter({ |
571dd39f |
67 | exports => \@exports, |
68 | groups => { default => [':all'] } |
69 | }); |
70 | |
71 | sub unimport { |
e85d2a5d |
72 | no strict 'refs'; |
571dd39f |
73 | my $class = caller(); |
74 | # loop through the exports ... |
75 | foreach my $name (@exports) { |
76 | # if we find one ... |
77 | if (defined &{$class . '::' . $name}) { |
78 | my $keyword = \&{$class . '::' . $name}; |
e85d2a5d |
79 | |
571dd39f |
80 | # make sure it is from Moose |
53dd42d8 |
81 | my ($pkg_name) = Class::MOP::get_code_info($keyword); |
571dd39f |
82 | next if $@; |
83 | next if $pkg_name ne 'Moose::Util::TypeConstraints'; |
e85d2a5d |
84 | |
571dd39f |
85 | # and if it is from Moose then undef the slot |
86 | delete ${$class . '::'}{$name}; |
87 | } |
2c0cbef7 |
88 | } |
571dd39f |
89 | } |
a15dff8d |
90 | |
d9b40005 |
91 | ## -------------------------------------------------------- |
92 | ## type registry and some useful functions for it |
93 | ## -------------------------------------------------------- |
94 | |
22aed3c0 |
95 | my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new; |
587ae0d2 |
96 | |
d9b40005 |
97 | sub get_type_constraint_registry { $REGISTRY } |
e85d2a5d |
98 | sub list_all_type_constraints { keys %{$REGISTRY->type_constraints} } |
d9b40005 |
99 | sub export_type_constraints_as_functions { |
100 | my $pkg = caller(); |
101 | no strict 'refs'; |
a0f8153d |
102 | foreach my $constraint (keys %{$REGISTRY->type_constraints}) { |
42bc21a4 |
103 | my $tc = $REGISTRY->get_type_constraint($constraint)->_compiled_type_constraint; |
104 | *{"${pkg}::${constraint}"} = sub { $tc->($_[0]) ? 1 : undef }; |
a0f8153d |
105 | } |
d9b40005 |
106 | } |
182134e8 |
107 | |
d9b40005 |
108 | sub create_type_constraint_union (@) { |
109 | my @type_constraint_names; |
e85d2a5d |
110 | |
f1917f58 |
111 | if (scalar @_ == 1 && _detect_type_constraint_union($_[0])) { |
112 | @type_constraint_names = _parse_type_constraint_union($_[0]); |
d9b40005 |
113 | } |
114 | else { |
115 | @type_constraint_names = @_; |
429ccc11 |
116 | } |
e85d2a5d |
117 | |
3726f905 |
118 | (scalar @type_constraint_names >= 2) |
e85d2a5d |
119 | || confess "You must pass in at least 2 type names to make a union"; |
120 | |
d9b40005 |
121 | ($REGISTRY->has_type_constraint($_)) |
122 | || confess "Could not locate type constraint ($_) for the union" |
123 | foreach @type_constraint_names; |
e85d2a5d |
124 | |
3726f905 |
125 | return Moose::Meta::TypeConstraint::Union->new( |
126 | type_constraints => [ |
e85d2a5d |
127 | map { |
128 | $REGISTRY->get_type_constraint($_) |
129 | } @type_constraint_names |
3726f905 |
130 | ], |
e85d2a5d |
131 | ); |
182134e8 |
132 | } |
a15dff8d |
133 | |
0fbd4b0a |
134 | sub create_parameterized_type_constraint ($) { |
d9b40005 |
135 | my $type_constraint_name = shift; |
e85d2a5d |
136 | |
0fbd4b0a |
137 | my ($base_type, $type_parameter) = _parse_parameterized_type_constraint($type_constraint_name); |
e85d2a5d |
138 | |
0fbd4b0a |
139 | (defined $base_type && defined $type_parameter) |
d9b40005 |
140 | || confess "Could not parse type name ($type_constraint_name) correctly"; |
e85d2a5d |
141 | |
d9b40005 |
142 | ($REGISTRY->has_type_constraint($base_type)) |
143 | || confess "Could not locate the base type ($base_type)"; |
e85d2a5d |
144 | |
0fbd4b0a |
145 | return Moose::Meta::TypeConstraint::Parameterized->new( |
d9b40005 |
146 | name => $type_constraint_name, |
147 | parent => $REGISTRY->get_type_constraint($base_type), |
0fbd4b0a |
148 | type_parameter => find_or_create_type_constraint( |
149 | $type_parameter => { |
f1917f58 |
150 | parent => $REGISTRY->get_type_constraint('Object'), |
0fbd4b0a |
151 | constraint => sub { $_[0]->isa($type_parameter) } |
f1917f58 |
152 | } |
153 | ), |
e85d2a5d |
154 | ); |
22aed3c0 |
155 | } |
156 | |
4ab662d6 |
157 | #should we also support optimized checks? |
158 | sub create_class_type_constraint ($;$) { |
3fef8ce8 |
159 | my $class = shift; |
3fef8ce8 |
160 | # too early for this check |
161 | #find_type_constraint("ClassName")->check($class) |
162 | # || confess "Can't create a class type constraint because '$class' is not a class name"; |
4ab662d6 |
163 | my $message; |
164 | if( $_[0] ){ |
165 | $message = $_[0]->{message} if exists $_[0]->{message}; |
166 | } |
3fef8ce8 |
167 | |
4ab662d6 |
168 | Moose::Meta::TypeConstraint::Class->new( |
169 | name => $class, |
170 | ($message ? (message => $message) : ()) |
171 | ); |
3fef8ce8 |
172 | } |
173 | |
d9b40005 |
174 | sub find_or_create_type_constraint ($;$) { |
175 | my ($type_constraint_name, $options_for_anon_type) = @_; |
e85d2a5d |
176 | |
d9b40005 |
177 | return $REGISTRY->get_type_constraint($type_constraint_name) |
178 | if $REGISTRY->has_type_constraint($type_constraint_name); |
e85d2a5d |
179 | |
d9b40005 |
180 | my $constraint; |
e85d2a5d |
181 | |
f1917f58 |
182 | if (_detect_type_constraint_union($type_constraint_name)) { |
d9b40005 |
183 | $constraint = create_type_constraint_union($type_constraint_name); |
184 | } |
0fbd4b0a |
185 | elsif (_detect_parameterized_type_constraint($type_constraint_name)) { |
e85d2a5d |
186 | $constraint = create_parameterized_type_constraint($type_constraint_name); |
d9b40005 |
187 | } |
188 | else { |
189 | # NOTE: |
4ab662d6 |
190 | # if there is no $options_for_anon_type |
191 | # specified, then we assume they don't |
f3c4e20e |
192 | # want to create one, and return nothing. |
4ab662d6 |
193 | return unless defined $options_for_anon_type; |
f3c4e20e |
194 | |
195 | # NOTE: |
d9b40005 |
196 | # otherwise assume that we should create |
e85d2a5d |
197 | # an ANON type with the $options_for_anon_type |
d9b40005 |
198 | # options which can be passed in. It should |
e85d2a5d |
199 | # be noted that these don't get registered |
d9b40005 |
200 | # so we need to return it. |
201 | # - SL |
202 | return Moose::Meta::TypeConstraint->new( |
203 | name => '__ANON__', |
e85d2a5d |
204 | %{$options_for_anon_type} |
d9b40005 |
205 | ); |
206 | } |
e85d2a5d |
207 | |
d9b40005 |
208 | $REGISTRY->add_type_constraint($constraint); |
e85d2a5d |
209 | return $constraint; |
d9b40005 |
210 | } |
22aed3c0 |
211 | |
212 | ## -------------------------------------------------------- |
213 | ## exported functions ... |
214 | ## -------------------------------------------------------- |
215 | |
216 | sub find_type_constraint ($) { $REGISTRY->get_type_constraint(@_) } |
217 | |
3fef8ce8 |
218 | sub register_type_constraint ($) { |
219 | my $constraint = shift; |
220 | confess "can't register an unnamed type constraint" unless defined $constraint->name; |
221 | $REGISTRY->add_type_constraint($constraint); |
222 | } |
223 | |
7c13858b |
224 | # type constructors |
a15dff8d |
225 | |
815ec671 |
226 | sub type ($$;$$) { |
1b7df21f |
227 | splice(@_, 1, 0, undef); |
a0f8153d |
228 | goto &_create_type_constraint; |
a15dff8d |
229 | } |
230 | |
8ecb1fa0 |
231 | sub subtype ($$;$$$) { |
86629f93 |
232 | # NOTE: |
233 | # this adds an undef for the name |
234 | # if this is an anon-subtype: |
235 | # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype |
236 | # but if the last arg is not a code |
237 | # ref then it is a subtype alias: |
238 | # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num |
e85d2a5d |
239 | # ... yeah I know it's ugly code |
86629f93 |
240 | # - SL |
a0f8153d |
241 | unshift @_ => undef if scalar @_ <= 2 && (reftype($_[1]) || '') eq 'CODE'; |
242 | goto &_create_type_constraint; |
a15dff8d |
243 | } |
244 | |
4ab662d6 |
245 | sub class_type ($;$) { |
246 | register_type_constraint( |
247 | create_class_type_constraint( |
248 | $_[0], |
249 | ( defined($_[1]) ? $_[1] : () ), |
250 | ) |
251 | ); |
3fef8ce8 |
252 | } |
253 | |
4b598ea3 |
254 | sub coerce ($@) { |
e85d2a5d |
255 | my ($type_name, @coercion_map) = @_; |
7c13858b |
256 | _install_type_coercions($type_name, \@coercion_map); |
182134e8 |
257 | } |
258 | |
76d37e5a |
259 | sub as ($) { $_[0] } |
260 | sub from ($) { $_[0] } |
261 | sub where (&) { $_[0] } |
262 | sub via (&) { $_[0] } |
8ecb1fa0 |
263 | |
264 | sub message (&) { +{ message => $_[0] } } |
265 | sub optimize_as (&) { +{ optimized => $_[0] } } |
a15dff8d |
266 | |
2c0cbef7 |
267 | sub enum ($;@) { |
fcec2383 |
268 | my ($type_name, @values) = @_; |
4ab662d6 |
269 | # NOTE: |
270 | # if only an array-ref is passed then |
9f4334a1 |
271 | # you get an anon-enum |
272 | # - SL |
273 | if (ref $type_name eq 'ARRAY' && !@values) { |
274 | @values = @$type_name; |
275 | $type_name = undef; |
276 | } |
2c0cbef7 |
277 | (scalar @values >= 2) |
278 | || confess "You must have at least two values to enumerate through"; |
c4fe165f |
279 | my %valid = map { $_ => 1 } @values; |
a0f8153d |
280 | _create_type_constraint( |
281 | $type_name, |
282 | 'Str', |
283 | sub { $valid{$_} } |
284 | ); |
fcec2383 |
285 | } |
286 | |
d9b40005 |
287 | ## -------------------------------------------------------- |
288 | ## desugaring functions ... |
289 | ## -------------------------------------------------------- |
290 | |
e85d2a5d |
291 | sub _create_type_constraint ($$$;$$) { |
d9b40005 |
292 | my $name = shift; |
293 | my $parent = shift; |
8de73ff1 |
294 | my $check = shift; |
e85d2a5d |
295 | |
d9b40005 |
296 | my ($message, $optimized); |
297 | for (@_) { |
298 | $message = $_->{message} if exists $_->{message}; |
e85d2a5d |
299 | $optimized = $_->{optimized} if exists $_->{optimized}; |
d9b40005 |
300 | } |
301 | |
302 | my $pkg_defined_in = scalar(caller(0)); |
e85d2a5d |
303 | |
d9b40005 |
304 | if (defined $name) { |
305 | my $type = $REGISTRY->get_type_constraint($name); |
e85d2a5d |
306 | |
d9b40005 |
307 | ($type->_package_defined_in eq $pkg_defined_in) |
e85d2a5d |
308 | || confess ("The type constraint '$name' has already been created in " |
d9b40005 |
309 | . $type->_package_defined_in . " and cannot be created again in " |
310 | . $pkg_defined_in) |
e85d2a5d |
311 | if defined $type; |
312 | } |
313 | |
a0f8153d |
314 | $parent = find_or_create_type_constraint($parent) if defined $parent; |
4ab662d6 |
315 | |
d9b40005 |
316 | my $constraint = Moose::Meta::TypeConstraint->new( |
317 | name => $name || '__ANON__', |
d9b40005 |
318 | package_defined_in => $pkg_defined_in, |
e85d2a5d |
319 | |
320 | ($parent ? (parent => $parent ) : ()), |
321 | ($check ? (constraint => $check) : ()), |
322 | ($message ? (message => $message) : ()), |
323 | ($optimized ? (optimized => $optimized) : ()), |
d9b40005 |
324 | ); |
4ab662d6 |
325 | |
8de73ff1 |
326 | # NOTE: |
4ab662d6 |
327 | # if we have a type constraint union, and no |
8de73ff1 |
328 | # type check, this means we are just aliasing |
4ab662d6 |
329 | # the union constraint, which means we need to |
8de73ff1 |
330 | # handle this differently. |
331 | # - SL |
4ab662d6 |
332 | if (not(defined $check) |
333 | && $parent->isa('Moose::Meta::TypeConstraint::Union') |
334 | && $parent->has_coercion |
8de73ff1 |
335 | ){ |
336 | $constraint->coercion(Moose::Meta::TypeCoercion::Union->new( |
337 | type_constraint => $parent |
338 | )); |
4ab662d6 |
339 | } |
d9b40005 |
340 | |
341 | $REGISTRY->add_type_constraint($constraint) |
342 | if defined $name; |
343 | |
344 | return $constraint; |
345 | } |
346 | |
e85d2a5d |
347 | sub _install_type_coercions ($$) { |
d9b40005 |
348 | my ($type_name, $coercion_map) = @_; |
349 | my $type = $REGISTRY->get_type_constraint($type_name); |
6f9ff1af |
350 | (defined $type) |
351 | || confess "Cannot find type '$type_name', perhaps you forgot to load it."; |
41e007e4 |
352 | if ($type->has_coercion) { |
353 | $type->coercion->add_type_coercions(@$coercion_map); |
354 | } |
355 | else { |
356 | my $type_coercion = Moose::Meta::TypeCoercion->new( |
357 | type_coercion_map => $coercion_map, |
358 | type_constraint => $type |
359 | ); |
360 | $type->coercion($type_coercion); |
361 | } |
d9b40005 |
362 | } |
363 | |
364 | ## -------------------------------------------------------- |
f1917f58 |
365 | ## type notation parsing ... |
366 | ## -------------------------------------------------------- |
367 | |
368 | { |
e85d2a5d |
369 | # All I have to say is mugwump++ cause I know |
370 | # do not even have enough regexp-fu to be able |
371 | # to have written this (I can only barely |
f1917f58 |
372 | # understand it as it is) |
e85d2a5d |
373 | # - SL |
374 | |
f1917f58 |
375 | use re "eval"; |
376 | |
3796382a |
377 | my $valid_chars = qr{[\w:]}; |
f1917f58 |
378 | my $type_atom = qr{ $valid_chars+ }; |
379 | |
380 | my $type = qr{ $valid_chars+ (?: \[ (??{$any}) \] )? }x; |
381 | my $type_capture_parts = qr{ ($valid_chars+) (?: \[ ((??{$any})) \] )? }x; |
382 | my $type_with_parameter = qr{ $valid_chars+ \[ (??{$any}) \] }x; |
383 | |
3796382a |
384 | my $op_union = qr{ \s* \| \s* }x; |
f1917f58 |
385 | my $union = qr{ $type (?: $op_union $type )+ }x; |
386 | |
387 | our $any = qr{ $type | $union }x; |
388 | |
0fbd4b0a |
389 | sub _parse_parameterized_type_constraint { |
e85d2a5d |
390 | $_[0] =~ m{ $type_capture_parts }x; |
391 | return ($1, $2); |
f1917f58 |
392 | } |
393 | |
0fbd4b0a |
394 | sub _detect_parameterized_type_constraint { |
e85d2a5d |
395 | $_[0] =~ m{ ^ $type_with_parameter $ }x; |
f1917f58 |
396 | } |
397 | |
398 | sub _parse_type_constraint_union { |
e85d2a5d |
399 | my $given = shift; |
400 | my @rv; |
401 | while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) { |
402 | push @rv => $1; |
403 | } |
404 | (pos($given) eq length($given)) |
405 | || confess "'$given' didn't parse (parse-pos=" |
406 | . pos($given) |
407 | . " and str-length=" |
408 | . length($given) |
409 | . ")"; |
410 | @rv; |
f1917f58 |
411 | } |
412 | |
413 | sub _detect_type_constraint_union { |
e85d2a5d |
414 | $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x; |
f1917f58 |
415 | } |
416 | } |
417 | |
418 | ## -------------------------------------------------------- |
d9b40005 |
419 | # define some basic built-in types |
420 | ## -------------------------------------------------------- |
a15dff8d |
421 | |
f65cb534 |
422 | type 'Any' => where { 1 }; # meta-type including all |
e85d2a5d |
423 | type 'Item' => where { 1 }; # base-type |
a15dff8d |
424 | |
fd542f49 |
425 | subtype 'Undef' => as 'Item' => where { !defined($_) }; |
426 | subtype 'Defined' => as 'Item' => where { defined($_) }; |
a15dff8d |
427 | |
8ecb1fa0 |
428 | subtype 'Bool' |
e85d2a5d |
429 | => as 'Item' |
8ecb1fa0 |
430 | => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' }; |
5a4c5493 |
431 | |
e85d2a5d |
432 | subtype 'Value' |
433 | => as 'Defined' |
434 | => where { !ref($_) } |
28ffb449 |
435 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Value; |
e85d2a5d |
436 | |
8ecb1fa0 |
437 | subtype 'Ref' |
e85d2a5d |
438 | => as 'Defined' |
439 | => where { ref($_) } |
28ffb449 |
440 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Ref; |
8ecb1fa0 |
441 | |
e85d2a5d |
442 | subtype 'Str' |
443 | => as 'Value' |
444 | => where { 1 } |
28ffb449 |
445 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Str; |
8ecb1fa0 |
446 | |
e85d2a5d |
447 | subtype 'Num' |
448 | => as 'Value' |
449 | => where { Scalar::Util::looks_like_number($_) } |
28ffb449 |
450 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Num; |
e85d2a5d |
451 | |
452 | subtype 'Int' |
453 | => as 'Num' |
8ecb1fa0 |
454 | => where { "$_" =~ /^-?[0-9]+$/ } |
28ffb449 |
455 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Int; |
8ecb1fa0 |
456 | |
28ffb449 |
457 | subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ScalarRef; |
28ffb449 |
458 | subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::CodeRef; |
459 | subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::RegexpRef; |
460 | subtype 'GlobRef' => as 'Ref' => where { ref($_) eq 'GLOB' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::GlobRef; |
a15dff8d |
461 | |
0a5bd159 |
462 | # NOTE: |
e85d2a5d |
463 | # scalar filehandles are GLOB refs, |
0a5bd159 |
464 | # but a GLOB ref is not always a filehandle |
e85d2a5d |
465 | subtype 'FileHandle' |
466 | => as 'GlobRef' |
128c601e |
467 | => where { Scalar::Util::openhandle($_) || ( blessed($_) && $_->isa("IO::Handle") ) } |
28ffb449 |
468 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::FileHandle; |
0a5bd159 |
469 | |
e85d2a5d |
470 | # NOTE: |
a15dff8d |
471 | # blessed(qr/.../) returns true,.. how odd |
e85d2a5d |
472 | subtype 'Object' |
473 | => as 'Ref' |
8ecb1fa0 |
474 | => where { blessed($_) && blessed($_) ne 'Regexp' } |
28ffb449 |
475 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Object; |
a15dff8d |
476 | |
e85d2a5d |
477 | subtype 'Role' |
478 | => as 'Object' |
8ecb1fa0 |
479 | => where { $_->can('does') } |
28ffb449 |
480 | => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Role; |
e85d2a5d |
481 | |
0e0709ea |
482 | my $_class_name_checker = sub { |
483 | return if ref($_[0]); |
484 | return unless defined($_[0]) && length($_[0]); |
485 | |
486 | # walk the symbol table tree to avoid autovififying |
487 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
488 | |
489 | my $pack = \*::; |
490 | foreach my $part (split('::', $_[0])) { |
491 | return unless exists ${$$pack}{"${part}::"}; |
492 | $pack = \*{${$$pack}{"${part}::"}}; |
493 | } |
494 | |
495 | # check for $VERSION or @ISA |
496 | return 1 if exists ${$$pack}{VERSION} |
497 | && defined *{${$$pack}{VERSION}}{SCALAR}; |
498 | return 1 if exists ${$$pack}{ISA} |
499 | && defined *{${$$pack}{ISA}}{ARRAY}; |
500 | |
501 | # check for any method |
502 | foreach ( keys %{$$pack} ) { |
503 | next if substr($_, -2, 2) eq '::'; |
504 | return 1 if defined *{${$$pack}{$_}}{CODE}; |
505 | } |
506 | |
507 | # fail |
508 | return; |
509 | }; |
510 | |
e85d2a5d |
511 | subtype 'ClassName' |
512 | => as 'Str' |
0e0709ea |
513 | => $_class_name_checker # where ... |
514 | => { optimize => $_class_name_checker }; |
02a0fb52 |
515 | |
d9b40005 |
516 | ## -------------------------------------------------------- |
7e4e1ad4 |
517 | # parameterizable types ... |
518 | |
519 | $REGISTRY->add_type_constraint( |
520 | Moose::Meta::TypeConstraint::Parameterizable->new( |
521 | name => 'ArrayRef', |
522 | package_defined_in => __PACKAGE__, |
523 | parent => find_type_constraint('Ref'), |
524 | constraint => sub { ref($_) eq 'ARRAY' }, |
525 | optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef, |
526 | constraint_generator => sub { |
527 | my $type_parameter = shift; |
528 | return sub { |
529 | foreach my $x (@$_) { |
530 | ($type_parameter->check($x)) || return |
531 | } 1; |
532 | } |
533 | } |
534 | ) |
535 | ); |
536 | |
537 | $REGISTRY->add_type_constraint( |
538 | Moose::Meta::TypeConstraint::Parameterizable->new( |
539 | name => 'HashRef', |
540 | package_defined_in => __PACKAGE__, |
541 | parent => find_type_constraint('Ref'), |
542 | constraint => sub { ref($_) eq 'HASH' }, |
543 | optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef, |
544 | constraint_generator => sub { |
4ab662d6 |
545 | my $type_parameter = shift; |
7e4e1ad4 |
546 | return sub { |
547 | foreach my $x (values %$_) { |
548 | ($type_parameter->check($x)) || return |
549 | } 1; |
550 | } |
551 | } |
552 | ) |
553 | ); |
554 | |
555 | $REGISTRY->add_type_constraint( |
556 | Moose::Meta::TypeConstraint::Parameterizable->new( |
557 | name => 'Maybe', |
558 | package_defined_in => __PACKAGE__, |
559 | parent => find_type_constraint('Item'), |
560 | constraint => sub { 1 }, |
561 | constraint_generator => sub { |
4ab662d6 |
562 | my $type_parameter = shift; |
7e4e1ad4 |
563 | return sub { |
564 | return 1 if not(defined($_)) || $type_parameter->check($_); |
565 | return; |
566 | } |
567 | } |
568 | ) |
569 | ); |
570 | |
4ab662d6 |
571 | my @PARAMETERIZABLE_TYPES = map { |
572 | $REGISTRY->get_type_constraint($_) |
7e4e1ad4 |
573 | } qw[ArrayRef HashRef Maybe]; |
574 | |
575 | sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES } |
4ab662d6 |
576 | sub add_parameterizable_type { |
7e4e1ad4 |
577 | my $type = shift; |
578 | (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable')) |
579 | || confess "Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type"; |
580 | push @PARAMETERIZABLE_TYPES => $type; |
4ab662d6 |
581 | } |
7e4e1ad4 |
582 | |
583 | ## -------------------------------------------------------- |
d9b40005 |
584 | # end of built-in types ... |
585 | ## -------------------------------------------------------- |
586 | |
943596a6 |
587 | { |
588 | my @BUILTINS = list_all_type_constraints(); |
589 | sub list_all_builtin_type_constraints { @BUILTINS } |
590 | } |
591 | |
a15dff8d |
592 | 1; |
593 | |
594 | __END__ |
595 | |
596 | =pod |
597 | |
598 | =head1 NAME |
599 | |
e522431d |
600 | Moose::Util::TypeConstraints - Type constraint system for Moose |
a15dff8d |
601 | |
602 | =head1 SYNOPSIS |
603 | |
604 | use Moose::Util::TypeConstraints; |
605 | |
2c0cbef7 |
606 | type 'Num' => where { Scalar::Util::looks_like_number($_) }; |
e85d2a5d |
607 | |
608 | subtype 'Natural' |
609 | => as 'Num' |
a15dff8d |
610 | => where { $_ > 0 }; |
e85d2a5d |
611 | |
612 | subtype 'NaturalLessThanTen' |
2c0cbef7 |
613 | => as 'Natural' |
79592a54 |
614 | => where { $_ < 10 } |
615 | => message { "This number ($_) is not less than ten!" }; |
e85d2a5d |
616 | |
617 | coerce 'Num' |
2c0cbef7 |
618 | => from 'Str' |
e85d2a5d |
619 | => via { 0+$_ }; |
620 | |
2c0cbef7 |
621 | enum 'RGBColors' => qw(red green blue); |
a15dff8d |
622 | |
623 | =head1 DESCRIPTION |
624 | |
e85d2a5d |
625 | This module provides Moose with the ability to create custom type |
626 | contraints to be used in attribute definition. |
e522431d |
627 | |
6ba6d68c |
628 | =head2 Important Caveat |
629 | |
e85d2a5d |
630 | This is B<NOT> a type system for Perl 5. These are type constraints, |
631 | and they are not used by Moose unless you tell it to. No type |
632 | inference is performed, expression are not typed, etc. etc. etc. |
6ba6d68c |
633 | |
e85d2a5d |
634 | This is simply a means of creating small constraint functions which |
a7d0cd00 |
635 | can be used to simplify your own type-checking code. |
6ba6d68c |
636 | |
2c0cbef7 |
637 | =head2 Slightly Less Important Caveat |
638 | |
e85d2a5d |
639 | It is almost always a good idea to quote your type and subtype names. |
640 | This is to prevent perl from trying to execute the call as an indirect |
2c0cbef7 |
641 | object call. This issue only seems to come up when you have a subtype |
e85d2a5d |
642 | the same name as a valid class, but when the issue does arise it tends |
643 | to be quite annoying to debug. |
2c0cbef7 |
644 | |
645 | So for instance, this: |
e85d2a5d |
646 | |
2c0cbef7 |
647 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
648 | |
649 | will I<Just Work>, while this: |
650 | |
651 | use DateTime; |
652 | subtype DateTime => as Object => where { $_->isa('DateTime') }; |
653 | |
e85d2a5d |
654 | will fail silently and cause many headaches. The simple way to solve |
655 | this, as well as future proof your subtypes from classes which have |
2c0cbef7 |
656 | yet to have been created yet, is to simply do this: |
657 | |
658 | use DateTime; |
d44714be |
659 | subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') }; |
2c0cbef7 |
660 | |
6ba6d68c |
661 | =head2 Default Type Constraints |
e522431d |
662 | |
e85d2a5d |
663 | This module also provides a simple hierarchy for Perl 5 types, this |
e522431d |
664 | could probably use some work, but it works for me at the moment. |
665 | |
666 | Any |
e85d2a5d |
667 | Item |
5a4c5493 |
668 | Bool |
7e4e1ad4 |
669 | Maybe[`a] |
f65cb534 |
670 | Undef |
671 | Defined |
5a4c5493 |
672 | Value |
673 | Num |
674 | Int |
675 | Str |
9af1d28b |
676 | ClassName |
5a4c5493 |
677 | Ref |
678 | ScalarRef |
7e4e1ad4 |
679 | ArrayRef[`a] |
680 | HashRef[`a] |
5a4c5493 |
681 | CodeRef |
682 | RegexpRef |
3f7376b0 |
683 | GlobRef |
0a5bd159 |
684 | FileHandle |
e85d2a5d |
685 | Object |
5a4c5493 |
686 | Role |
e522431d |
687 | |
6ba6d68c |
688 | Suggestions for improvement are welcome. |
2c0cbef7 |
689 | |
4ab662d6 |
690 | B<NOTE:> Any type followed by a type parameter C<[`a]> can be |
7e4e1ad4 |
691 | parameterized, this means you can say: |
692 | |
693 | ArrayRef[Int] # an array of intergers |
694 | HashRef[CodeRef] # a hash of str to CODE ref mappings |
695 | Maybe[Str] # value may be a string, may be undefined |
696 | |
4ab662d6 |
697 | B<NOTE:> The C<Undef> type constraint for the most part works |
698 | correctly now, but edge cases may still exist, please use it |
7e4e1ad4 |
699 | sparringly. |
703e92fb |
700 | |
7e4e1ad4 |
701 | B<NOTE:> The C<ClassName> type constraint does a complex package |
4ab662d6 |
702 | existence check. This means that your class B<must> be loaded for |
703 | this type constraint to pass. I know this is not ideal for all, |
7e4e1ad4 |
704 | but it is a saner restriction than most others. |
9af1d28b |
705 | |
703e92fb |
706 | =head2 Use with Other Constraint Modules |
707 | |
e85d2a5d |
708 | This module should play fairly nicely with other constraint |
709 | modules with only some slight tweaking. The C<where> clause |
703e92fb |
710 | in types is expected to be a C<CODE> reference which checks |
711 | it's first argument and returns a bool. Since most constraint |
e85d2a5d |
712 | modules work in a similar way, it should be simple to adapt |
703e92fb |
713 | them to work with Moose. |
714 | |
e85d2a5d |
715 | For instance, this is how you could use it with |
716 | L<Declare::Constraints::Simple> to declare a completely new type. |
703e92fb |
717 | |
e85d2a5d |
718 | type 'HashOfArrayOfObjects' |
703e92fb |
719 | => IsHashRef( |
720 | -keys => HasLength, |
721 | -values => IsArrayRef( IsObject )); |
722 | |
723 | For more examples see the F<t/204_example_w_DCS.t> test file. |
724 | |
e85d2a5d |
725 | Here is an example of using L<Test::Deep> and it's non-test |
726 | related C<eq_deeply> function. |
703e92fb |
727 | |
e85d2a5d |
728 | type 'ArrayOfHashOfBarsAndRandomNumbers' |
703e92fb |
729 | => where { |
e85d2a5d |
730 | eq_deeply($_, |
703e92fb |
731 | array_each(subhashof({ |
732 | bar => isa('Bar'), |
733 | random_number => ignore() |
e85d2a5d |
734 | }))) |
703e92fb |
735 | }; |
736 | |
e85d2a5d |
737 | For a complete example see the F<t/205_example_w_TestDeep.t> |
738 | test file. |
739 | |
a15dff8d |
740 | =head1 FUNCTIONS |
741 | |
d9b40005 |
742 | =head2 Type Constraint Construction & Locating |
182134e8 |
743 | |
744 | =over 4 |
745 | |
d9b40005 |
746 | =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)> |
182134e8 |
747 | |
e85d2a5d |
748 | Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>, |
d9b40005 |
749 | this will return a L<Moose::Meta::TypeConstraint::Union> instance. |
182134e8 |
750 | |
0fbd4b0a |
751 | =item B<create_parameterized_type_constraint ($type_name)> |
c07af9d2 |
752 | |
d9b40005 |
753 | Given a C<$type_name> in the form of: |
c07af9d2 |
754 | |
d9b40005 |
755 | BaseType[ContainerType] |
182134e8 |
756 | |
e85d2a5d |
757 | this will extract the base type and container type and build an instance of |
4ab662d6 |
758 | L<Moose::Meta::TypeConstraint::Parameterized> for it. |
d9b40005 |
759 | |
4ab662d6 |
760 | =item B<create_class_type_constraint ($class, ?$message)> |
3fef8ce8 |
761 | |
762 | Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class> |
763 | object for that class name. |
764 | |
d9b40005 |
765 | =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)> |
6ba6d68c |
766 | |
e85d2a5d |
767 | This will attempt to find or create a type constraint given the a C<$type_name>. |
768 | If it cannot find it in the registry, it will see if it should be a union or |
769 | container type an create one if appropriate, and lastly if nothing can be |
770 | found or created that way, it will create an anon-type using the |
f3c4e20e |
771 | C<$options_for_anon_type> HASH ref to populate it. If the C<$options_for_anon_type> |
772 | is not specified (it is C<undef>), then it will not create anything and simply |
773 | return. |
429ccc11 |
774 | |
d9b40005 |
775 | =item B<find_type_constraint ($type_name)> |
776 | |
777 | This function can be used to locate a specific type constraint |
778 | meta-object, of the class L<Moose::Meta::TypeConstraint> or a |
779 | derivative. What you do with it from there is up to you :) |
780 | |
3fef8ce8 |
781 | =item B<register_type_constraint ($type_object)> |
782 | |
783 | This function will register a named type constraint with the type registry. |
784 | |
d9b40005 |
785 | =item B<get_type_constraint_registry> |
786 | |
e85d2a5d |
787 | Fetch the L<Moose::Meta::TypeConstraint::Registry> object which |
d9b40005 |
788 | keeps track of all type constraints. |
429ccc11 |
789 | |
b1e01e3c |
790 | =item B<list_all_type_constraints> |
791 | |
e85d2a5d |
792 | This will return a list of type constraint names, you can then |
793 | fetch them using C<find_type_constraint ($type_name)> if you |
b1e01e3c |
794 | want to. |
795 | |
943596a6 |
796 | =item B<list_all_builtin_type_constraints> |
797 | |
e85d2a5d |
798 | This will return a list of builtin type constraints, meaning, |
799 | those which are defined in this module. See the section |
943596a6 |
800 | labeled L<Default Type Constraints> for a complete list. |
801 | |
d9b40005 |
802 | =item B<export_type_constraints_as_functions> |
803 | |
e85d2a5d |
804 | This will export all the current type constraints as functions |
805 | into the caller's namespace. Right now, this is mostly used for |
d9b40005 |
806 | testing, but it might prove useful to others. |
807 | |
7e4e1ad4 |
808 | =item B<get_all_parameterizable_types> |
809 | |
810 | This returns all the parameterizable types that have been registered. |
811 | |
812 | =item B<add_parameterizable_type ($type)> |
813 | |
814 | Adds C<$type> to the list of parameterizable types |
815 | |
182134e8 |
816 | =back |
817 | |
a15dff8d |
818 | =head2 Type Constraint Constructors |
819 | |
e85d2a5d |
820 | The following functions are used to create type constraints. |
821 | They will then register the type constraints in a global store |
822 | where Moose can get to them if it needs to. |
a15dff8d |
823 | |
25f2c3fc |
824 | See the L<SYNOPSIS> for an example of how to use these. |
a15dff8d |
825 | |
6ba6d68c |
826 | =over 4 |
a15dff8d |
827 | |
6ba6d68c |
828 | =item B<type ($name, $where_clause)> |
a15dff8d |
829 | |
e85d2a5d |
830 | This creates a base type, which has no parent. |
a15dff8d |
831 | |
79592a54 |
832 | =item B<subtype ($name, $parent, $where_clause, ?$message)> |
182134e8 |
833 | |
e85d2a5d |
834 | This creates a named subtype. |
d6e2d9a1 |
835 | |
79592a54 |
836 | =item B<subtype ($parent, $where_clause, ?$message)> |
182134e8 |
837 | |
e85d2a5d |
838 | This creates an unnamed subtype and will return the type |
839 | constraint meta-object, which will be an instance of |
840 | L<Moose::Meta::TypeConstraint>. |
a15dff8d |
841 | |
4ab662d6 |
842 | =item B<class_type ($class, ?$message)> |
3fef8ce8 |
843 | |
844 | Creates a type constraint with the name C<$class> and the metaclass |
845 | L<Moose::Meta::TypeConstraint::Class>. |
846 | |
fcec2383 |
847 | =item B<enum ($name, @values)> |
848 | |
e85d2a5d |
849 | This will create a basic subtype for a given set of strings. |
850 | The resulting constraint will be a subtype of C<Str> and |
4ce56d04 |
851 | will match any of the items in C<@values>. It is case sensitive. |
852 | See the L<SYNOPSIS> for a simple example. |
2c0cbef7 |
853 | |
e85d2a5d |
854 | B<NOTE:> This is not a true proper enum type, it is simple |
2c0cbef7 |
855 | a convient constraint builder. |
856 | |
9f4334a1 |
857 | =item B<enum (\@values)> |
858 | |
4ab662d6 |
859 | If passed an ARRAY reference instead of the C<$name>, C<@values> pair, |
9f4334a1 |
860 | this will create an unnamed enum. This can then be used in an attribute |
861 | definition like so: |
862 | |
863 | has 'sort_order' => ( |
864 | is => 'ro', |
4ab662d6 |
865 | isa => enum([qw[ ascending descending ]]), |
9f4334a1 |
866 | ); |
867 | |
6ba6d68c |
868 | =item B<as> |
a15dff8d |
869 | |
6ba6d68c |
870 | This is just sugar for the type constraint construction syntax. |
a15dff8d |
871 | |
6ba6d68c |
872 | =item B<where> |
a15dff8d |
873 | |
6ba6d68c |
874 | This is just sugar for the type constraint construction syntax. |
76d37e5a |
875 | |
876 | =item B<message> |
877 | |
878 | This is just sugar for the type constraint construction syntax. |
a15dff8d |
879 | |
8ecb1fa0 |
880 | =item B<optimize_as> |
881 | |
e85d2a5d |
882 | This can be used to define a "hand optimized" version of your |
d44714be |
883 | type constraint which can be used to avoid traversing a subtype |
e85d2a5d |
884 | constraint heirarchy. |
d44714be |
885 | |
e85d2a5d |
886 | B<NOTE:> You should only use this if you know what you are doing, |
887 | all the built in types use this, so your subtypes (assuming they |
d44714be |
888 | are shallow) will not likely need to use this. |
889 | |
6ba6d68c |
890 | =back |
a15dff8d |
891 | |
6ba6d68c |
892 | =head2 Type Coercion Constructors |
a15dff8d |
893 | |
e85d2a5d |
894 | Type constraints can also contain type coercions as well. If you |
895 | ask your accessor to coerce, then Moose will run the type-coercion |
896 | code first, followed by the type constraint check. This feature |
897 | should be used carefully as it is very powerful and could easily |
587ae0d2 |
898 | take off a limb if you are not careful. |
a15dff8d |
899 | |
25f2c3fc |
900 | See the L<SYNOPSIS> for an example of how to use these. |
a15dff8d |
901 | |
6ba6d68c |
902 | =over 4 |
a15dff8d |
903 | |
6ba6d68c |
904 | =item B<coerce> |
a15dff8d |
905 | |
6ba6d68c |
906 | =item B<from> |
a15dff8d |
907 | |
6ba6d68c |
908 | This is just sugar for the type coercion construction syntax. |
909 | |
910 | =item B<via> |
a15dff8d |
911 | |
6ba6d68c |
912 | This is just sugar for the type coercion construction syntax. |
a15dff8d |
913 | |
914 | =back |
915 | |
571dd39f |
916 | =head2 Namespace Management |
917 | |
918 | =over 4 |
919 | |
920 | =item B<unimport> |
921 | |
e85d2a5d |
922 | This will remove all the type constraint keywords from the |
571dd39f |
923 | calling class namespace. |
924 | |
925 | =back |
926 | |
a15dff8d |
927 | =head1 BUGS |
928 | |
e85d2a5d |
929 | All complex software has bugs lurking in it, and this module is no |
a15dff8d |
930 | exception. If you find a bug please either email me, or add the bug |
931 | to cpan-RT. |
932 | |
a15dff8d |
933 | =head1 AUTHOR |
934 | |
935 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
936 | |
937 | =head1 COPYRIGHT AND LICENSE |
938 | |
778db3ac |
939 | Copyright 2006-2008 by Infinity Interactive, Inc. |
a15dff8d |
940 | |
941 | L<http://www.iinteractive.com> |
942 | |
943 | This library is free software; you can redistribute it and/or modify |
e85d2a5d |
944 | it under the same terms as Perl itself. |
a15dff8d |
945 | |
81dc201f |
946 | =cut |