2 package Moose::Util::TypeConstraints;
8 use Scalar::Util 'blessed';
11 our $VERSION = '0.57';
12 $VERSION = eval $VERSION;
13 our $AUTHORITY = 'cpan:STEVAN';
15 ## --------------------------------------------------------
16 # Prototyped subs must be predeclared because we have a
17 # circular dependency with Moose::Meta::Attribute et. al.
18 # so in case of us being use'd first the predeclaration
19 # ensures the prototypes are in scope when consumers are
36 sub _create_type_constraint ($$$;$$);
37 sub _install_type_coercions ($$);
39 ## --------------------------------------------------------
41 use Moose::Meta::TypeConstraint;
42 use Moose::Meta::TypeConstraint::Union;
43 use Moose::Meta::TypeConstraint::Parameterized;
44 use Moose::Meta::TypeConstraint::Parameterizable;
45 use Moose::Meta::TypeConstraint::Class;
46 use Moose::Meta::TypeConstraint::Role;
47 use Moose::Meta::TypeConstraint::Enum;
48 use Moose::Meta::TypeCoercion;
49 use Moose::Meta::TypeCoercion::Union;
50 use Moose::Meta::TypeConstraint::Registry;
51 use Moose::Util::TypeConstraints::OptimizedConstraints;
53 Moose::Exporter->setup_import_methods(
56 type subtype class_type role_type as where message optimize_as
60 register_type_constraint )
65 ## --------------------------------------------------------
66 ## type registry and some useful functions for it
67 ## --------------------------------------------------------
69 my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new;
71 sub get_type_constraint_registry { $REGISTRY }
72 sub list_all_type_constraints { keys %{$REGISTRY->type_constraints} }
73 sub export_type_constraints_as_functions {
76 foreach my $constraint (keys %{$REGISTRY->type_constraints}) {
77 my $tc = $REGISTRY->get_type_constraint($constraint)->_compiled_type_constraint;
78 *{"${pkg}::${constraint}"} = sub { $tc->($_[0]) ? 1 : undef }; # the undef is for compat
82 sub create_type_constraint_union {
83 my @type_constraint_names;
85 if (scalar @_ == 1 && _detect_type_constraint_union($_[0])) {
86 @type_constraint_names = _parse_type_constraint_union($_[0]);
89 @type_constraint_names = @_;
92 (scalar @type_constraint_names >= 2)
93 || Moose->throw_error("You must pass in at least 2 type names to make a union");
95 my @type_constraints = sort {$a->name cmp $b->name} map {
96 find_or_parse_type_constraint($_) ||
97 Moose->throw_error("Could not locate type constraint ($_) for the union");
98 } @type_constraint_names;
100 return Moose::Meta::TypeConstraint::Union->new(
101 type_constraints => \@type_constraints
105 sub create_parameterized_type_constraint {
106 my $type_constraint_name = shift;
107 my ($base_type, $type_parameter) = _parse_parameterized_type_constraint($type_constraint_name);
109 (defined $base_type && defined $type_parameter)
110 || Moose->throw_error("Could not parse type name ($type_constraint_name) correctly");
112 if ($REGISTRY->has_type_constraint($base_type)) {
113 my $base_type_tc = $REGISTRY->get_type_constraint($base_type);
114 return _create_parameterized_type_constraint(
119 Moose->throw_error("Could not locate the base type ($base_type)");
123 sub _create_parameterized_type_constraint {
124 my ( $base_type_tc, $type_parameter ) = @_;
125 if ( $base_type_tc->can('parameterize') ) {
126 return $base_type_tc->parameterize($type_parameter);
129 return Moose::Meta::TypeConstraint::Parameterized->new(
130 name => $base_type_tc->name . '[' . $type_parameter . ']',
131 parent => $base_type_tc,
133 find_or_create_isa_type_constraint($type_parameter),
138 #should we also support optimized checks?
139 sub create_class_type_constraint {
140 my ( $class, $options ) = @_;
142 # too early for this check
143 #find_type_constraint("ClassName")->check($class)
144 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
152 $options{name} ||= "__ANON__";
154 Moose::Meta::TypeConstraint::Class->new( %options );
157 sub create_role_type_constraint {
158 my ( $role, $options ) = @_;
160 # too early for this check
161 #find_type_constraint("ClassName")->check($class)
162 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
170 $options{name} ||= "__ANON__";
172 Moose::Meta::TypeConstraint::Role->new( %options );
176 sub find_or_create_type_constraint {
177 my ( $type_constraint_name, $options_for_anon_type ) = @_;
179 if ( my $constraint = find_or_parse_type_constraint($type_constraint_name) ) {
182 elsif ( defined $options_for_anon_type ) {
184 # if there is no $options_for_anon_type
185 # specified, then we assume they don't
186 # want to create one, and return nothing.
188 # otherwise assume that we should create
189 # an ANON type with the $options_for_anon_type
190 # options which can be passed in. It should
191 # be noted that these don't get registered
192 # so we need to return it.
194 return Moose::Meta::TypeConstraint->new(
196 %{$options_for_anon_type}
203 sub find_or_create_isa_type_constraint {
204 my $type_constraint_name = shift;
205 find_or_parse_type_constraint($type_constraint_name) || create_class_type_constraint($type_constraint_name)
208 sub find_or_create_does_type_constraint {
209 my $type_constraint_name = shift;
210 find_or_parse_type_constraint($type_constraint_name) || create_role_type_constraint($type_constraint_name)
213 sub find_or_parse_type_constraint {
214 my $type_constraint_name = normalize_type_constraint_name(shift);
217 if ($constraint = find_type_constraint($type_constraint_name)) {
219 } elsif (_detect_type_constraint_union($type_constraint_name)) {
220 $constraint = create_type_constraint_union($type_constraint_name);
221 } elsif (_detect_parameterized_type_constraint($type_constraint_name)) {
222 $constraint = create_parameterized_type_constraint($type_constraint_name);
227 $REGISTRY->add_type_constraint($constraint);
231 sub normalize_type_constraint_name {
232 my $type_constraint_name = shift @_;
233 $type_constraint_name =~ s/\s//g;
234 return $type_constraint_name;
237 ## --------------------------------------------------------
238 ## exported functions ...
239 ## --------------------------------------------------------
241 sub find_type_constraint {
244 if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) {
248 return unless $REGISTRY->has_type_constraint($type);
249 return $REGISTRY->get_type_constraint($type);
253 sub register_type_constraint {
254 my $constraint = shift;
255 Moose->throw_error("can't register an unnamed type constraint") unless defined $constraint->name;
256 $REGISTRY->add_type_constraint($constraint);
263 splice(@_, 1, 0, undef);
264 goto &_create_type_constraint;
267 sub subtype ($$;$$$) {
269 # this adds an undef for the name
270 # if this is an anon-subtype:
271 # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype
272 # but if the last arg is not a code
273 # ref then it is a subtype alias:
274 # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num
275 # ... yeah I know it's ugly code
277 unshift @_ => undef if scalar @_ <= 2 && ('CODE' eq ref($_[1]));
278 goto &_create_type_constraint;
281 sub class_type ($;$) {
282 register_type_constraint(
283 create_class_type_constraint(
285 ( defined($_[1]) ? $_[1] : () ),
290 sub role_type ($;$) {
291 register_type_constraint(
292 create_role_type_constraint(
294 ( defined($_[1]) ? $_[1] : () ),
300 my ($type_name, @coercion_map) = @_;
301 _install_type_coercions($type_name, \@coercion_map);
305 sub from ($) { $_[0] }
306 sub where (&) { $_[0] }
307 sub via (&) { $_[0] }
309 sub message (&) { +{ message => $_[0] } }
310 sub optimize_as (&) { +{ optimized => $_[0] } }
313 my ($type_name, @values) = @_;
315 # if only an array-ref is passed then
316 # you get an anon-enum
318 if (ref $type_name eq 'ARRAY' && !@values) {
319 @values = @$type_name;
322 (scalar @values >= 2)
323 || Moose->throw_error("You must have at least two values to enumerate through");
324 my %valid = map { $_ => 1 } @values;
326 register_type_constraint(
327 create_enum_type_constraint(
334 sub create_enum_type_constraint {
335 my ( $type_name, $values ) = @_;
337 Moose::Meta::TypeConstraint::Enum->new(
338 name => $type_name || '__ANON__',
343 ## --------------------------------------------------------
344 ## desugaring functions ...
345 ## --------------------------------------------------------
347 sub _create_type_constraint ($$$;$$) {
352 my ($message, $optimized);
354 $message = $_->{message} if exists $_->{message};
355 $optimized = $_->{optimized} if exists $_->{optimized};
358 my $pkg_defined_in = scalar(caller(0));
361 my $type = $REGISTRY->get_type_constraint($name);
363 ($type->_package_defined_in eq $pkg_defined_in)
364 || confess ("The type constraint '$name' has already been created in "
365 . $type->_package_defined_in . " and cannot be created again in "
370 my $class = "Moose::Meta::TypeConstraint";
372 # FIXME should probably not be a special case
373 if ( defined $parent and $parent = find_or_parse_type_constraint($parent) ) {
374 $class = "Moose::Meta::TypeConstraint::Parameterizable"
375 if $parent->isa("Moose::Meta::TypeConstraint::Parameterizable");
378 my $constraint = $class->new(
379 name => $name || '__ANON__',
380 package_defined_in => $pkg_defined_in,
382 ($parent ? (parent => $parent ) : ()),
383 ($check ? (constraint => $check) : ()),
384 ($message ? (message => $message) : ()),
385 ($optimized ? (optimized => $optimized) : ()),
389 # if we have a type constraint union, and no
390 # type check, this means we are just aliasing
391 # the union constraint, which means we need to
392 # handle this differently.
394 if (not(defined $check)
395 && $parent->isa('Moose::Meta::TypeConstraint::Union')
396 && $parent->has_coercion
398 $constraint->coercion(Moose::Meta::TypeCoercion::Union->new(
399 type_constraint => $parent
403 $REGISTRY->add_type_constraint($constraint)
409 sub _install_type_coercions ($$) {
410 my ($type_name, $coercion_map) = @_;
411 my $type = find_type_constraint($type_name);
413 || Moose->throw_error("Cannot find type '$type_name', perhaps you forgot to load it.");
414 if ($type->has_coercion) {
415 $type->coercion->add_type_coercions(@$coercion_map);
418 my $type_coercion = Moose::Meta::TypeCoercion->new(
419 type_coercion_map => $coercion_map,
420 type_constraint => $type
422 $type->coercion($type_coercion);
426 ## --------------------------------------------------------
427 ## type notation parsing ...
428 ## --------------------------------------------------------
431 # All I have to say is mugwump++ cause I know
432 # do not even have enough regexp-fu to be able
433 # to have written this (I can only barely
434 # understand it as it is)
439 my $valid_chars = qr{[\w:]};
440 my $type_atom = qr{ $valid_chars+ };
444 my $type = qr{ $valid_chars+ (?: \[ \s* (??{$any}) \s* \] )? }x;
445 my $type_capture_parts = qr{ ($valid_chars+) (?: \[ \s* ((??{$any})) \s* \] )? }x;
446 my $type_with_parameter = qr{ $valid_chars+ \[ \s* (??{$any}) \s* \] }x;
448 my $op_union = qr{ \s* \| \s* }x;
449 my $union = qr{ $type (?: $op_union $type )+ }x;
451 ## New Stuff for structured types.
453 my $indirection = qr{=>};
454 my $divider_ops = qr{ $comma | $indirection }x;
455 my $structure_divider = qr{\s* $divider_ops \s*}x;
456 my $structure_elements = qr{ ($type $structure_divider*)+ }x;
458 $any = qr{ $type | $union | $structure_elements }x;
460 sub _parse_parameterized_type_constraint {
461 { no warnings 'void'; $any; } # force capture of interpolated lexical
462 my($base, $elements) = ($_[0] =~ m{ $type_capture_parts }x);
463 return ($base,$elements);
466 sub _detect_parameterized_type_constraint {
467 { no warnings 'void'; $any; } # force capture of interpolated lexical
468 $_[0] =~ m{ ^ $type_with_parameter $ }x;
471 sub _parse_type_constraint_union {
472 { no warnings 'void'; $any; } # force capture of interpolated lexical
475 while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) {
478 (pos($given) eq length($given))
479 || Moose->throw_error("'$given' didn't parse (parse-pos="
487 sub _detect_type_constraint_union {
488 { no warnings 'void'; $any; } # force capture of interpolated lexical
489 $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x;
493 ## --------------------------------------------------------
494 # define some basic built-in types
495 ## --------------------------------------------------------
497 type 'Any' => where { 1 }; # meta-type including all
498 type 'Item' => where { 1 }; # base-type
500 subtype 'Undef' => as 'Item' => where { !defined($_) };
501 subtype 'Defined' => as 'Item' => where { defined($_) };
505 => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' };
509 => where { !ref($_) }
510 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Value;
515 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Ref;
520 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Str;
524 => where { Scalar::Util::looks_like_number($_) }
525 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Num;
529 => where { "$_" =~ /^-?[0-9]+$/ }
530 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Int;
532 subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ScalarRef;
533 subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::CodeRef;
534 subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::RegexpRef;
535 subtype 'GlobRef' => as 'Ref' => where { ref($_) eq 'GLOB' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::GlobRef;
538 # scalar filehandles are GLOB refs,
539 # but a GLOB ref is not always a filehandle
542 => where { Scalar::Util::openhandle($_) || ( blessed($_) && $_->isa("IO::Handle") ) }
543 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::FileHandle;
546 # blessed(qr/.../) returns true,.. how odd
549 => where { blessed($_) && blessed($_) ne 'Regexp' }
550 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Object;
554 => where { $_->can('does') }
555 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Role;
557 my $_class_name_checker = sub {
562 => where { Class::MOP::is_class_loaded($_) }
563 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ClassName;
565 ## --------------------------------------------------------
566 # parameterizable types ...
568 $REGISTRY->add_type_constraint(
569 Moose::Meta::TypeConstraint::Parameterizable->new(
571 package_defined_in => __PACKAGE__,
572 parent => find_type_constraint('Ref'),
573 constraint => sub { ref($_) eq 'ARRAY' },
574 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef,
575 constraint_generator => sub {
576 my $type_parameter = shift;
577 my $check = $type_parameter->_compiled_type_constraint;
579 foreach my $x (@$_) {
580 ($check->($x)) || return
587 $REGISTRY->add_type_constraint(
588 Moose::Meta::TypeConstraint::Parameterizable->new(
590 package_defined_in => __PACKAGE__,
591 parent => find_type_constraint('Ref'),
592 constraint => sub { ref($_) eq 'HASH' },
593 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef,
594 constraint_generator => sub {
595 my $type_parameter = shift;
596 my $check = $type_parameter->_compiled_type_constraint;
598 foreach my $x (values %$_) {
599 ($check->($x)) || return
606 $REGISTRY->add_type_constraint(
607 Moose::Meta::TypeConstraint::Parameterizable->new(
609 package_defined_in => __PACKAGE__,
610 parent => find_type_constraint('Item'),
611 constraint => sub { 1 },
612 constraint_generator => sub {
613 my $type_parameter = shift;
614 my $check = $type_parameter->_compiled_type_constraint;
616 return 1 if not(defined($_)) || $check->($_);
623 my @PARAMETERIZABLE_TYPES = map {
624 $REGISTRY->get_type_constraint($_)
625 } qw[ArrayRef HashRef Maybe];
627 sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES }
628 sub add_parameterizable_type {
630 (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable'))
631 || Moose->throw_error("Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type");
632 push @PARAMETERIZABLE_TYPES => $type;
635 ## --------------------------------------------------------
636 # end of built-in types ...
637 ## --------------------------------------------------------
640 my @BUILTINS = list_all_type_constraints();
641 sub list_all_builtin_type_constraints { @BUILTINS }
652 Moose::Util::TypeConstraints - Type constraint system for Moose
656 use Moose::Util::TypeConstraints;
658 type 'Num' => where { Scalar::Util::looks_like_number($_) };
664 subtype 'NaturalLessThanTen'
667 => message { "This number ($_) is not less than ten!" };
673 enum 'RGBColors' => qw(red green blue);
677 This module provides Moose with the ability to create custom type
678 contraints to be used in attribute definition.
680 =head2 Important Caveat
682 This is B<NOT> a type system for Perl 5. These are type constraints,
683 and they are not used by Moose unless you tell it to. No type
684 inference is performed, expression are not typed, etc. etc. etc.
686 This is simply a means of creating small constraint functions which
687 can be used to simplify your own type-checking code, with the added
688 side benefit of making your intentions clearer through self-documentation.
690 =head2 Slightly Less Important Caveat
692 It is B<always> a good idea to quote your type and subtype names.
694 This is to prevent perl from trying to execute the call as an indirect
695 object call. This issue only seems to come up when you have a subtype
696 the same name as a valid class, but when the issue does arise it tends
697 to be quite annoying to debug.
699 So for instance, this:
701 subtype DateTime => as Object => where { $_->isa('DateTime') };
703 will I<Just Work>, while this:
706 subtype DateTime => as Object => where { $_->isa('DateTime') };
708 will fail silently and cause many headaches. The simple way to solve
709 this, as well as future proof your subtypes from classes which have
710 yet to have been created yet, is to simply do this:
713 subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
715 =head2 Default Type Constraints
717 This module also provides a simple hierarchy for Perl 5 types, here is
718 that hierarchy represented visually.
742 B<NOTE:> Any type followed by a type parameter C<[`a]> can be
743 parameterized, this means you can say:
745 ArrayRef[Int] # an array of intergers
746 HashRef[CodeRef] # a hash of str to CODE ref mappings
747 Maybe[Str] # value may be a string, may be undefined
749 B<NOTE:> Unless you parameterize a type, then it is invalid to
750 include the square brackets. I.e. C<ArrayRef[]> will be
751 literally interpreted as a type name.
753 B<NOTE:> The C<Undef> type constraint for the most part works
754 correctly now, but edge cases may still exist, please use it
757 B<NOTE:> The C<ClassName> type constraint does a complex package
758 existence check. This means that your class B<must> be loaded for
759 this type constraint to pass. I know this is not ideal for all,
760 but it is a saner restriction than most others.
762 =head2 Type Constraint Naming
764 Since the types created by this module are global, it is suggested
765 that you namespace your types just as you would namespace your
766 modules. So instead of creating a I<Color> type for your B<My::Graphics>
767 module, you would call the type I<My::Graphics::Color> instead.
769 =head2 Use with Other Constraint Modules
771 This module should play fairly nicely with other constraint
772 modules with only some slight tweaking. The C<where> clause
773 in types is expected to be a C<CODE> reference which checks
774 it's first argument and returns a boolean. Since most constraint
775 modules work in a similar way, it should be simple to adapt
776 them to work with Moose.
778 For instance, this is how you could use it with
779 L<Declare::Constraints::Simple> to declare a completely new type.
781 type 'HashOfArrayOfObjects'
784 -values => IsArrayRef( IsObject ));
786 For more examples see the F<t/200_examples/204_example_w_DCS.t>
789 Here is an example of using L<Test::Deep> and it's non-test
790 related C<eq_deeply> function.
792 type 'ArrayOfHashOfBarsAndRandomNumbers'
795 array_each(subhashof({
797 random_number => ignore()
801 For a complete example see the
802 F<t/200_examples/205_example_w_TestDeep.t> test file.
806 =head2 Type Constraint Constructors
808 The following functions are used to create type constraints.
809 They will then register the type constraints in a global store
810 where Moose can get to them if it needs to.
812 See the L<SYNOPSIS> for an example of how to use these.
816 =item B<type ($name, $where_clause)>
818 This creates a base type, which has no parent.
820 =item B<subtype ($name, $parent, $where_clause, ?$message)>
822 This creates a named subtype.
824 =item B<subtype ($parent, $where_clause, ?$message)>
826 This creates an unnamed subtype and will return the type
827 constraint meta-object, which will be an instance of
828 L<Moose::Meta::TypeConstraint>.
830 =item B<class_type ($class, ?$options)>
832 Creates a type constraint with the name C<$class> and the metaclass
833 L<Moose::Meta::TypeConstraint::Class>.
835 =item B<role_type ($role, ?$options)>
837 Creates a type constraint with the name C<$role> and the metaclass
838 L<Moose::Meta::TypeConstraint::Role>.
840 =item B<enum ($name, @values)>
842 This will create a basic subtype for a given set of strings.
843 The resulting constraint will be a subtype of C<Str> and
844 will match any of the items in C<@values>. It is case sensitive.
845 See the L<SYNOPSIS> for a simple example.
847 B<NOTE:> This is not a true proper enum type, it is simple
848 a convient constraint builder.
850 =item B<enum (\@values)>
852 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
853 this will create an unnamed enum. This can then be used in an attribute
856 has 'sort_order' => (
858 isa => enum([qw[ ascending descending ]]),
863 This is just sugar for the type constraint construction syntax.
867 This is just sugar for the type constraint construction syntax.
869 Takes a block/code ref as an argument. When the type constraint is
870 tested, the supplied code is run with the value to be tested in
871 $_. This block should return true or false to indicate whether or not
872 the constraint check passed.
876 This is just sugar for the type constraint construction syntax.
878 Takes a block/code ref as an argument. When the type constraint fails,
879 then the code block is run (with the value provided in $_). This code
880 ref should return a string, which will be used in the text of the
885 This can be used to define a "hand optimized" version of your
886 type constraint which can be used to avoid traversing a subtype
887 constraint heirarchy.
889 B<NOTE:> You should only use this if you know what you are doing,
890 all the built in types use this, so your subtypes (assuming they
891 are shallow) will not likely need to use this.
895 =head2 Type Coercion Constructors
897 Type constraints can also contain type coercions as well. If you
898 ask your accessor to coerce, then Moose will run the type-coercion
899 code first, followed by the type constraint check. This feature
900 should be used carefully as it is very powerful and could easily
901 take off a limb if you are not careful.
903 See the L<SYNOPSIS> for an example of how to use these.
911 This is just sugar for the type coercion construction syntax.
915 This is just sugar for the type coercion construction syntax.
919 =head2 Type Constraint Construction & Locating
923 =item B<normalize_type_constraint_name ($type_constraint_name)>
925 Given a string that is expected to match a type constraint, will normalize the
926 string so that extra whitespace and newlines are removed.
928 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
930 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
931 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
933 =item B<create_parameterized_type_constraint ($type_name)>
935 Given a C<$type_name> in the form of:
937 BaseType[ContainerType]
939 this will extract the base type and container type and build an instance of
940 L<Moose::Meta::TypeConstraint::Parameterized> for it.
942 =item B<create_class_type_constraint ($class, ?$options)>
944 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
945 object for that class name.
947 =item B<create_role_type_constraint ($role, ?$options)>
949 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
950 object for that role name.
952 =item B<create_enum_type_constraint ($name, $values)>
954 =item B<find_or_parse_type_constraint ($type_name)>
956 This will attempt to find or create a type constraint given the a C<$type_name>.
957 If it cannot find it in the registry, it will see if it should be a union or
958 container type an create one if appropriate
960 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
962 This function will first call C<find_or_parse_type_constraint> with the type name.
964 If no type is found or created, but C<$options_for_anon_type> are provided, it
965 will create the corresponding type.
967 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
968 and are now superseded by C<find_or_create_isa_type_constraint> and
969 C<find_or_create_does_type_constraint>.
971 =item B<find_or_create_isa_type_constraint ($type_name)>
973 =item B<find_or_create_does_type_constraint ($type_name)>
975 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
976 no appropriate constraint is found will create a new anonymous one.
978 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
979 variant will use C<create_role_type_constraint>.
981 =item B<find_type_constraint ($type_name)>
983 This function can be used to locate a specific type constraint
984 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
985 derivative. What you do with it from there is up to you :)
987 =item B<register_type_constraint ($type_object)>
989 This function will register a named type constraint with the type registry.
991 =item B<get_type_constraint_registry>
993 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
994 keeps track of all type constraints.
996 =item B<list_all_type_constraints>
998 This will return a list of type constraint names, you can then
999 fetch them using C<find_type_constraint ($type_name)> if you
1002 =item B<list_all_builtin_type_constraints>
1004 This will return a list of builtin type constraints, meaning,
1005 those which are defined in this module. See the section
1006 labeled L<Default Type Constraints> for a complete list.
1008 =item B<export_type_constraints_as_functions>
1010 This will export all the current type constraints as functions
1011 into the caller's namespace. Right now, this is mostly used for
1012 testing, but it might prove useful to others.
1014 =item B<get_all_parameterizable_types>
1016 This returns all the parameterizable types that have been registered.
1018 =item B<add_parameterizable_type ($type)>
1020 Adds C<$type> to the list of parameterizable types
1024 =head1 Error Management
1030 If the caller is a Moose metaclass, use its L<Moose::Meta::Class/throw_error>
1031 routine, otherwise use L<Carp/confess>.
1035 =head2 Namespace Management
1041 This will remove all the type constraint keywords from the
1042 calling class namespace.
1048 All complex software has bugs lurking in it, and this module is no
1049 exception. If you find a bug please either email me, or add the bug
1054 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1056 =head1 COPYRIGHT AND LICENSE
1058 Copyright 2006-2008 by Infinity Interactive, Inc.
1060 L<http://www.iinteractive.com>
1062 This library is free software; you can redistribute it and/or modify
1063 it under the same terms as Perl itself.