2 package Moose::Util::TypeConstraints;
8 use Scalar::Util 'blessed';
11 our $VERSION = '0.24';
12 our $AUTHORITY = 'cpan:STEVAN';
14 ## --------------------------------------------------------
15 # Prototyped subs must be predeclared because we have a
16 # circular dependency with Moose::Meta::Attribute et. al.
17 # so in case of us being use'd first the predeclaration
18 # ensures the prototypes are in scope when consumers are
21 # creation and location
22 sub find_type_constraint ($);
23 sub register_type_constraint ($);
24 sub find_or_create_type_constraint ($;$);
25 sub find_or_parse_type_constraint ($);
26 sub find_or_create_isa_type_constraint ($);
27 sub find_or_create_does_type_constraint ($);
28 sub create_type_constraint_union (@);
29 sub create_parameterized_type_constraint ($);
30 sub create_class_type_constraint ($;$);
31 sub create_role_type_constraint ($;$);
32 sub create_enum_type_constraint ($$);
48 sub _create_type_constraint ($$$;$$);
49 sub _install_type_coercions ($$);
51 ## --------------------------------------------------------
53 use Moose::Meta::TypeConstraint;
54 use Moose::Meta::TypeConstraint::Union;
55 use Moose::Meta::TypeConstraint::Parameterized;
56 use Moose::Meta::TypeConstraint::Parameterizable;
57 use Moose::Meta::TypeConstraint::Class;
58 use Moose::Meta::TypeConstraint::Role;
59 use Moose::Meta::TypeConstraint::Enum;
60 use Moose::Meta::TypeCoercion;
61 use Moose::Meta::TypeCoercion::Union;
62 use Moose::Meta::TypeConstraint::Registry;
63 use Moose::Util::TypeConstraints::OptimizedConstraints;
66 type subtype class_type role_type as where message optimize_as
70 register_type_constraint
73 Sub::Exporter::setup_exporter({
75 groups => { default => [':all'] }
81 # loop through the exports ...
82 foreach my $name (@exports) {
84 if (defined &{$class . '::' . $name}) {
85 my $keyword = \&{$class . '::' . $name};
87 # make sure it is from Moose
88 my ($pkg_name) = Class::MOP::get_code_info($keyword);
90 next if $pkg_name ne 'Moose::Util::TypeConstraints';
92 # and if it is from Moose then undef the slot
93 delete ${$class . '::'}{$name};
98 ## --------------------------------------------------------
99 ## type registry and some useful functions for it
100 ## --------------------------------------------------------
102 my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new;
104 sub get_type_constraint_registry { $REGISTRY }
105 sub list_all_type_constraints { keys %{$REGISTRY->type_constraints} }
106 sub export_type_constraints_as_functions {
109 foreach my $constraint (keys %{$REGISTRY->type_constraints}) {
110 my $tc = $REGISTRY->get_type_constraint($constraint)->_compiled_type_constraint;
111 *{"${pkg}::${constraint}"} = sub { $tc->($_[0]) ? 1 : undef };
115 sub create_type_constraint_union (@) {
116 my @type_constraint_names;
118 if (scalar @_ == 1 && _detect_type_constraint_union($_[0])) {
119 @type_constraint_names = _parse_type_constraint_union($_[0]);
122 @type_constraint_names = @_;
125 (scalar @type_constraint_names >= 2)
126 || confess "You must pass in at least 2 type names to make a union";
128 ($REGISTRY->has_type_constraint($_))
129 || confess "Could not locate type constraint ($_) for the union"
130 foreach @type_constraint_names;
132 return Moose::Meta::TypeConstraint::Union->new(
133 type_constraints => [
135 $REGISTRY->get_type_constraint($_)
136 } @type_constraint_names
141 sub create_parameterized_type_constraint ($) {
142 my $type_constraint_name = shift;
144 my ($base_type, $type_parameter) = _parse_parameterized_type_constraint($type_constraint_name);
146 (defined $base_type && defined $type_parameter)
147 || confess "Could not parse type name ($type_constraint_name) correctly";
149 ($REGISTRY->has_type_constraint($base_type))
150 || confess "Could not locate the base type ($base_type)";
152 return Moose::Meta::TypeConstraint::Parameterized->new(
153 name => $type_constraint_name,
154 parent => $REGISTRY->get_type_constraint($base_type),
155 type_parameter => find_or_create_isa_type_constraint($type_parameter),
159 #should we also support optimized checks?
160 sub create_class_type_constraint ($;$) {
161 my ( $class, $options ) = @_;
163 # too early for this check
164 #find_type_constraint("ClassName")->check($class)
165 # || confess "Can't create a class type constraint because '$class' is not a class name";
173 $options{name} ||= "__ANON__";
175 Moose::Meta::TypeConstraint::Class->new( %options );
178 sub create_role_type_constraint ($;$) {
179 my ( $role, $options ) = @_;
181 # too early for this check
182 #find_type_constraint("ClassName")->check($class)
183 # || confess "Can't create a class type constraint because '$class' is not a class name";
191 $options{name} ||= "__ANON__";
193 Moose::Meta::TypeConstraint::Role->new( %options );
197 sub find_or_create_type_constraint ($;$) {
198 my ( $type_constraint_name, $options_for_anon_type ) = @_;
200 if ( my $constraint = find_or_parse_type_constraint($type_constraint_name) ) {
203 elsif ( defined $options_for_anon_type ) {
205 # if there is no $options_for_anon_type
206 # specified, then we assume they don't
207 # want to create one, and return nothing.
209 # otherwise assume that we should create
210 # an ANON type with the $options_for_anon_type
211 # options which can be passed in. It should
212 # be noted that these don't get registered
213 # so we need to return it.
215 return Moose::Meta::TypeConstraint->new(
217 %{$options_for_anon_type}
224 sub find_or_create_isa_type_constraint ($) {
225 my $type_constraint_name = shift;
226 find_or_parse_type_constraint($type_constraint_name) || create_class_type_constraint($type_constraint_name)
229 sub find_or_create_does_type_constraint ($) {
230 my $type_constraint_name = shift;
231 find_or_parse_type_constraint($type_constraint_name) || create_role_type_constraint($type_constraint_name)
234 sub find_or_parse_type_constraint ($) {
235 my $type_constraint_name = shift;
237 return $REGISTRY->get_type_constraint($type_constraint_name)
238 if $REGISTRY->has_type_constraint($type_constraint_name);
242 if (_detect_type_constraint_union($type_constraint_name)) {
243 $constraint = create_type_constraint_union($type_constraint_name);
245 elsif (_detect_parameterized_type_constraint($type_constraint_name)) {
246 $constraint = create_parameterized_type_constraint($type_constraint_name);
251 $REGISTRY->add_type_constraint($constraint);
255 ## --------------------------------------------------------
256 ## exported functions ...
257 ## --------------------------------------------------------
259 sub find_type_constraint ($) {
262 if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) {
265 return $REGISTRY->get_type_constraint($type);
269 sub register_type_constraint ($) {
270 my $constraint = shift;
271 confess "can't register an unnamed type constraint" unless defined $constraint->name;
272 $REGISTRY->add_type_constraint($constraint);
279 splice(@_, 1, 0, undef);
280 goto &_create_type_constraint;
283 sub subtype ($$;$$$) {
285 # this adds an undef for the name
286 # if this is an anon-subtype:
287 # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype
288 # but if the last arg is not a code
289 # ref then it is a subtype alias:
290 # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num
291 # ... yeah I know it's ugly code
293 unshift @_ => undef if scalar @_ <= 2 && ('CODE' eq ref($_[1]));
294 goto &_create_type_constraint;
297 sub class_type ($;$) {
298 register_type_constraint(
299 create_class_type_constraint(
301 ( defined($_[1]) ? $_[1] : () ),
306 sub role_type ($;$) {
307 register_type_constraint(
308 create_role_type_constraint(
310 ( defined($_[1]) ? $_[1] : () ),
316 my ($type_name, @coercion_map) = @_;
317 _install_type_coercions($type_name, \@coercion_map);
321 sub from ($) { $_[0] }
322 sub where (&) { $_[0] }
323 sub via (&) { $_[0] }
325 sub message (&) { +{ message => $_[0] } }
326 sub optimize_as (&) { +{ optimized => $_[0] } }
329 my ($type_name, @values) = @_;
331 # if only an array-ref is passed then
332 # you get an anon-enum
334 if (ref $type_name eq 'ARRAY' && !@values) {
335 @values = @$type_name;
338 (scalar @values >= 2)
339 || confess "You must have at least two values to enumerate through";
340 my %valid = map { $_ => 1 } @values;
342 register_type_constraint(
343 create_enum_type_constraint(
350 sub create_enum_type_constraint ($$) {
351 my ( $type_name, $values ) = @_;
353 Moose::Meta::TypeConstraint::Enum->new(
354 name => $type_name || '__ANON__',
359 ## --------------------------------------------------------
360 ## desugaring functions ...
361 ## --------------------------------------------------------
363 sub _create_type_constraint ($$$;$$) {
368 my ($message, $optimized);
370 $message = $_->{message} if exists $_->{message};
371 $optimized = $_->{optimized} if exists $_->{optimized};
374 my $pkg_defined_in = scalar(caller(0));
377 my $type = $REGISTRY->get_type_constraint($name);
379 ($type->_package_defined_in eq $pkg_defined_in)
380 || confess ("The type constraint '$name' has already been created in "
381 . $type->_package_defined_in . " and cannot be created again in "
386 my $class = "Moose::Meta::TypeConstraint";
388 # FIXME should probably not be a special case
389 if ( defined $parent and $parent = find_or_parse_type_constraint($parent) ) {
390 $class = "Moose::Meta::TypeConstraint::Parameterizable"
391 if $parent->isa("Moose::Meta::TypeConstraint::Parameterizable");
394 my $constraint = $class->new(
395 name => $name || '__ANON__',
396 package_defined_in => $pkg_defined_in,
398 ($parent ? (parent => $parent ) : ()),
399 ($check ? (constraint => $check) : ()),
400 ($message ? (message => $message) : ()),
401 ($optimized ? (optimized => $optimized) : ()),
405 # if we have a type constraint union, and no
406 # type check, this means we are just aliasing
407 # the union constraint, which means we need to
408 # handle this differently.
410 if (not(defined $check)
411 && $parent->isa('Moose::Meta::TypeConstraint::Union')
412 && $parent->has_coercion
414 $constraint->coercion(Moose::Meta::TypeCoercion::Union->new(
415 type_constraint => $parent
419 $REGISTRY->add_type_constraint($constraint)
425 sub _install_type_coercions ($$) {
426 my ($type_name, $coercion_map) = @_;
427 my $type = $REGISTRY->get_type_constraint($type_name);
429 || confess "Cannot find type '$type_name', perhaps you forgot to load it.";
430 if ($type->has_coercion) {
431 $type->coercion->add_type_coercions(@$coercion_map);
434 my $type_coercion = Moose::Meta::TypeCoercion->new(
435 type_coercion_map => $coercion_map,
436 type_constraint => $type
438 $type->coercion($type_coercion);
442 ## --------------------------------------------------------
443 ## type notation parsing ...
444 ## --------------------------------------------------------
447 # All I have to say is mugwump++ cause I know
448 # do not even have enough regexp-fu to be able
449 # to have written this (I can only barely
450 # understand it as it is)
455 my $valid_chars = qr{[\w:]};
456 my $type_atom = qr{ $valid_chars+ };
458 my $type = qr{ $valid_chars+ (?: \[ (??{$any}) \] )? }x;
459 my $type_capture_parts = qr{ ($valid_chars+) (?: \[ ((??{$any})) \] )? }x;
460 my $type_with_parameter = qr{ $valid_chars+ \[ (??{$any}) \] }x;
462 my $op_union = qr{ \s* \| \s* }x;
463 my $union = qr{ $type (?: $op_union $type )+ }x;
465 our $any = qr{ $type | $union }x;
467 sub _parse_parameterized_type_constraint {
468 $_[0] =~ m{ $type_capture_parts }x;
472 sub _detect_parameterized_type_constraint {
473 $_[0] =~ m{ ^ $type_with_parameter $ }x;
476 sub _parse_type_constraint_union {
479 while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) {
482 (pos($given) eq length($given))
483 || confess "'$given' didn't parse (parse-pos="
491 sub _detect_type_constraint_union {
492 $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x;
496 ## --------------------------------------------------------
497 # define some basic built-in types
498 ## --------------------------------------------------------
500 type 'Any' => where { 1 }; # meta-type including all
501 type 'Item' => where { 1 }; # base-type
503 subtype 'Undef' => as 'Item' => where { !defined($_) };
504 subtype 'Defined' => as 'Item' => where { defined($_) };
508 => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' };
512 => where { !ref($_) }
513 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Value;
518 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Ref;
523 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Str;
527 => where { Scalar::Util::looks_like_number($_) }
528 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Num;
532 => where { "$_" =~ /^-?[0-9]+$/ }
533 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Int;
535 subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ScalarRef;
536 subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::CodeRef;
537 subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::RegexpRef;
538 subtype 'GlobRef' => as 'Ref' => where { ref($_) eq 'GLOB' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::GlobRef;
541 # scalar filehandles are GLOB refs,
542 # but a GLOB ref is not always a filehandle
545 => where { Scalar::Util::openhandle($_) || ( blessed($_) && $_->isa("IO::Handle") ) }
546 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::FileHandle;
549 # blessed(qr/.../) returns true,.. how odd
552 => where { blessed($_) && blessed($_) ne 'Regexp' }
553 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Object;
557 => where { $_->can('does') }
558 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Role;
560 my $_class_name_checker = sub {
561 return if ref($_[0]);
562 return unless defined($_[0]) && length($_[0]);
564 # walk the symbol table tree to avoid autovififying
565 # \*{${main::}{"Foo::"}} == \*main::Foo::
568 foreach my $part (split('::', $_[0])) {
569 return unless exists ${$$pack}{"${part}::"};
570 $pack = \*{${$$pack}{"${part}::"}};
573 # check for $VERSION or @ISA
574 return 1 if exists ${$$pack}{VERSION}
575 && defined *{${$$pack}{VERSION}}{SCALAR};
576 return 1 if exists ${$$pack}{ISA}
577 && defined *{${$$pack}{ISA}}{ARRAY};
579 # check for any method
580 foreach ( keys %{$$pack} ) {
581 next if substr($_, -2, 2) eq '::';
582 return 1 if defined *{${$$pack}{$_}}{CODE};
591 => $_class_name_checker # where ...
592 => { optimize => $_class_name_checker };
594 ## --------------------------------------------------------
595 # parameterizable types ...
597 $REGISTRY->add_type_constraint(
598 Moose::Meta::TypeConstraint::Parameterizable->new(
600 package_defined_in => __PACKAGE__,
601 parent => find_type_constraint('Ref'),
602 constraint => sub { ref($_) eq 'ARRAY' },
603 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef,
604 constraint_generator => sub {
605 my $type_parameter = shift;
606 my $check = $type_parameter->_compiled_type_constraint;
608 foreach my $x (@$_) {
609 ($check->($x)) || return
616 $REGISTRY->add_type_constraint(
617 Moose::Meta::TypeConstraint::Parameterizable->new(
619 package_defined_in => __PACKAGE__,
620 parent => find_type_constraint('Ref'),
621 constraint => sub { ref($_) eq 'HASH' },
622 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef,
623 constraint_generator => sub {
624 my $type_parameter = shift;
625 my $check = $type_parameter->_compiled_type_constraint;
627 foreach my $x (values %$_) {
628 ($check->($x)) || return
635 $REGISTRY->add_type_constraint(
636 Moose::Meta::TypeConstraint::Parameterizable->new(
638 package_defined_in => __PACKAGE__,
639 parent => find_type_constraint('Item'),
640 constraint => sub { 1 },
641 constraint_generator => sub {
642 my $type_parameter = shift;
643 my $check = $type_parameter->_compiled_type_constraint;
645 return 1 if not(defined($_)) || $check->($_);
652 my @PARAMETERIZABLE_TYPES = map {
653 $REGISTRY->get_type_constraint($_)
654 } qw[ArrayRef HashRef Maybe];
656 sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES }
657 sub add_parameterizable_type {
659 (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable'))
660 || confess "Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type";
661 push @PARAMETERIZABLE_TYPES => $type;
664 ## --------------------------------------------------------
665 # end of built-in types ...
666 ## --------------------------------------------------------
669 my @BUILTINS = list_all_type_constraints();
670 sub list_all_builtin_type_constraints { @BUILTINS }
681 Moose::Util::TypeConstraints - Type constraint system for Moose
685 use Moose::Util::TypeConstraints;
687 type 'Num' => where { Scalar::Util::looks_like_number($_) };
693 subtype 'NaturalLessThanTen'
696 => message { "This number ($_) is not less than ten!" };
702 enum 'RGBColors' => qw(red green blue);
706 This module provides Moose with the ability to create custom type
707 contraints to be used in attribute definition.
709 =head2 Important Caveat
711 This is B<NOT> a type system for Perl 5. These are type constraints,
712 and they are not used by Moose unless you tell it to. No type
713 inference is performed, expression are not typed, etc. etc. etc.
715 This is simply a means of creating small constraint functions which
716 can be used to simplify your own type-checking code, with the added
717 side benefit of making your intentions clearer through self-documentation.
719 =head2 Slightly Less Important Caveat
721 It is B<always> a good idea to quote your type and subtype names.
723 This is to prevent perl from trying to execute the call as an indirect
724 object call. This issue only seems to come up when you have a subtype
725 the same name as a valid class, but when the issue does arise it tends
726 to be quite annoying to debug.
728 So for instance, this:
730 subtype DateTime => as Object => where { $_->isa('DateTime') };
732 will I<Just Work>, while this:
735 subtype DateTime => as Object => where { $_->isa('DateTime') };
737 will fail silently and cause many headaches. The simple way to solve
738 this, as well as future proof your subtypes from classes which have
739 yet to have been created yet, is to simply do this:
742 subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
744 =head2 Default Type Constraints
746 This module also provides a simple hierarchy for Perl 5 types, here is
747 that hierarchy represented visually.
771 B<NOTE:> Any type followed by a type parameter C<[`a]> can be
772 parameterized, this means you can say:
774 ArrayRef[Int] # an array of intergers
775 HashRef[CodeRef] # a hash of str to CODE ref mappings
776 Maybe[Str] # value may be a string, may be undefined
778 B<NOTE:> The C<Undef> type constraint for the most part works
779 correctly now, but edge cases may still exist, please use it
782 B<NOTE:> The C<ClassName> type constraint does a complex package
783 existence check. This means that your class B<must> be loaded for
784 this type constraint to pass. I know this is not ideal for all,
785 but it is a saner restriction than most others.
787 =head2 Type Constraint Naming
789 Since the types created by this module are global, it is suggested
790 that you namespace your types just as you would namespace your
791 modules. So instead of creating a I<Color> type for your B<My::Graphics>
792 module, you would call the type I<My::Graphics::Color> instead.
794 =head2 Use with Other Constraint Modules
796 This module should play fairly nicely with other constraint
797 modules with only some slight tweaking. The C<where> clause
798 in types is expected to be a C<CODE> reference which checks
799 it's first argument and returns a boolean. Since most constraint
800 modules work in a similar way, it should be simple to adapt
801 them to work with Moose.
803 For instance, this is how you could use it with
804 L<Declare::Constraints::Simple> to declare a completely new type.
806 type 'HashOfArrayOfObjects'
809 -values => IsArrayRef( IsObject ));
811 For more examples see the F<t/200_examples/204_example_w_DCS.t>
814 Here is an example of using L<Test::Deep> and it's non-test
815 related C<eq_deeply> function.
817 type 'ArrayOfHashOfBarsAndRandomNumbers'
820 array_each(subhashof({
822 random_number => ignore()
826 For a complete example see the
827 F<t/200_examples/205_example_w_TestDeep.t> test file.
831 =head2 Type Constraint Constructors
833 The following functions are used to create type constraints.
834 They will then register the type constraints in a global store
835 where Moose can get to them if it needs to.
837 See the L<SYNOPSIS> for an example of how to use these.
841 =item B<type ($name, $where_clause)>
843 This creates a base type, which has no parent.
845 =item B<subtype ($name, $parent, $where_clause, ?$message)>
847 This creates a named subtype.
849 =item B<subtype ($parent, $where_clause, ?$message)>
851 This creates an unnamed subtype and will return the type
852 constraint meta-object, which will be an instance of
853 L<Moose::Meta::TypeConstraint>.
855 =item B<class_type ($class, ?$options)>
857 Creates a type constraint with the name C<$class> and the metaclass
858 L<Moose::Meta::TypeConstraint::Class>.
860 =item B<role_type ($role, ?$options)>
862 Creates a type constraint with the name C<$role> and the metaclass
863 L<Moose::Meta::TypeConstraint::Role>.
865 =item B<enum ($name, @values)>
867 This will create a basic subtype for a given set of strings.
868 The resulting constraint will be a subtype of C<Str> and
869 will match any of the items in C<@values>. It is case sensitive.
870 See the L<SYNOPSIS> for a simple example.
872 B<NOTE:> This is not a true proper enum type, it is simple
873 a convient constraint builder.
875 =item B<enum (\@values)>
877 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
878 this will create an unnamed enum. This can then be used in an attribute
881 has 'sort_order' => (
883 isa => enum([qw[ ascending descending ]]),
888 This is just sugar for the type constraint construction syntax.
892 This is just sugar for the type constraint construction syntax.
896 This is just sugar for the type constraint construction syntax.
900 This can be used to define a "hand optimized" version of your
901 type constraint which can be used to avoid traversing a subtype
902 constraint heirarchy.
904 B<NOTE:> You should only use this if you know what you are doing,
905 all the built in types use this, so your subtypes (assuming they
906 are shallow) will not likely need to use this.
910 =head2 Type Coercion Constructors
912 Type constraints can also contain type coercions as well. If you
913 ask your accessor to coerce, then Moose will run the type-coercion
914 code first, followed by the type constraint check. This feature
915 should be used carefully as it is very powerful and could easily
916 take off a limb if you are not careful.
918 See the L<SYNOPSIS> for an example of how to use these.
926 This is just sugar for the type coercion construction syntax.
930 This is just sugar for the type coercion construction syntax.
934 =head2 Type Constraint Construction & Locating
938 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
940 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
941 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
943 =item B<create_parameterized_type_constraint ($type_name)>
945 Given a C<$type_name> in the form of:
947 BaseType[ContainerType]
949 this will extract the base type and container type and build an instance of
950 L<Moose::Meta::TypeConstraint::Parameterized> for it.
952 =item B<create_class_type_constraint ($class, ?$options)>
954 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
955 object for that class name.
957 =item B<create_role_type_constraint ($role, ?$options)>
959 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
960 object for that role name.
962 =item B<create_enum_type_constraint ($name, $values)>
964 =item B<find_or_parse_type_constraint ($type_name)>
966 This will attempt to find or create a type constraint given the a C<$type_name>.
967 If it cannot find it in the registry, it will see if it should be a union or
968 container type an create one if appropriate
970 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
972 This function will first call C<find_or_parse_type_constraint> with the type name.
974 If no type is found or created, but C<$options_for_anon_type> are provided, it
975 will create the corresponding type.
977 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
978 and are now superseded by C<find_or_create_isa_type_constraint> and
979 C<find_or_create_does_type_constraint>.
981 =item B<find_or_create_isa_type_constraint ($type_name)>
983 =item B<find_or_create_does_type_constraint ($type_name)>
985 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
986 no appropriate constraint is found will create a new anonymous one.
988 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
989 variant will use C<create_role_type_constraint>.
991 =item B<find_type_constraint ($type_name)>
993 This function can be used to locate a specific type constraint
994 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
995 derivative. What you do with it from there is up to you :)
997 =item B<register_type_constraint ($type_object)>
999 This function will register a named type constraint with the type registry.
1001 =item B<get_type_constraint_registry>
1003 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
1004 keeps track of all type constraints.
1006 =item B<list_all_type_constraints>
1008 This will return a list of type constraint names, you can then
1009 fetch them using C<find_type_constraint ($type_name)> if you
1012 =item B<list_all_builtin_type_constraints>
1014 This will return a list of builtin type constraints, meaning,
1015 those which are defined in this module. See the section
1016 labeled L<Default Type Constraints> for a complete list.
1018 =item B<export_type_constraints_as_functions>
1020 This will export all the current type constraints as functions
1021 into the caller's namespace. Right now, this is mostly used for
1022 testing, but it might prove useful to others.
1024 =item B<get_all_parameterizable_types>
1026 This returns all the parameterizable types that have been registered.
1028 =item B<add_parameterizable_type ($type)>
1030 Adds C<$type> to the list of parameterizable types
1034 =head2 Namespace Management
1040 This will remove all the type constraint keywords from the
1041 calling class namespace.
1047 All complex software has bugs lurking in it, and this module is no
1048 exception. If you find a bug please either email me, or add the bug
1053 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1055 =head1 COPYRIGHT AND LICENSE
1057 Copyright 2006-2008 by Infinity Interactive, Inc.
1059 L<http://www.iinteractive.com>
1061 This library is free software; you can redistribute it and/or modify
1062 it under the same terms as Perl itself.