2 package Moose::Util::TypeConstraints;
8 use Scalar::Util 'blessed';
11 our $VERSION = '0.50';
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 $_class_name_checker = sub {
565 => where { Class::MOP::is_class_loaded($_) }
566 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ClassName;
568 ## --------------------------------------------------------
569 # parameterizable types ...
571 $REGISTRY->add_type_constraint(
572 Moose::Meta::TypeConstraint::Parameterizable->new(
574 package_defined_in => __PACKAGE__,
575 parent => find_type_constraint('Ref'),
576 constraint => sub { ref($_) eq 'ARRAY' },
577 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef,
578 constraint_generator => sub {
579 my $type_parameter = shift;
580 my $check = $type_parameter->_compiled_type_constraint;
582 foreach my $x (@$_) {
583 ($check->($x)) || return
590 $REGISTRY->add_type_constraint(
591 Moose::Meta::TypeConstraint::Parameterizable->new(
593 package_defined_in => __PACKAGE__,
594 parent => find_type_constraint('Ref'),
595 constraint => sub { ref($_) eq 'HASH' },
596 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef,
597 constraint_generator => sub {
598 my $type_parameter = shift;
599 my $check = $type_parameter->_compiled_type_constraint;
601 foreach my $x (values %$_) {
602 ($check->($x)) || return
609 $REGISTRY->add_type_constraint(
610 Moose::Meta::TypeConstraint::Parameterizable->new(
612 package_defined_in => __PACKAGE__,
613 parent => find_type_constraint('Item'),
614 constraint => sub { 1 },
615 constraint_generator => sub {
616 my $type_parameter = shift;
617 my $check = $type_parameter->_compiled_type_constraint;
619 return 1 if not(defined($_)) || $check->($_);
626 my @PARAMETERIZABLE_TYPES = map {
627 $REGISTRY->get_type_constraint($_)
628 } qw[ArrayRef HashRef Maybe];
630 sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES }
631 sub add_parameterizable_type {
633 (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable'))
634 || confess "Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type";
635 push @PARAMETERIZABLE_TYPES => $type;
638 ## --------------------------------------------------------
639 # end of built-in types ...
640 ## --------------------------------------------------------
643 my @BUILTINS = list_all_type_constraints();
644 sub list_all_builtin_type_constraints { @BUILTINS }
655 Moose::Util::TypeConstraints - Type constraint system for Moose
659 use Moose::Util::TypeConstraints;
661 type 'Num' => where { Scalar::Util::looks_like_number($_) };
667 subtype 'NaturalLessThanTen'
670 => message { "This number ($_) is not less than ten!" };
676 enum 'RGBColors' => qw(red green blue);
680 This module provides Moose with the ability to create custom type
681 contraints to be used in attribute definition.
683 =head2 Important Caveat
685 This is B<NOT> a type system for Perl 5. These are type constraints,
686 and they are not used by Moose unless you tell it to. No type
687 inference is performed, expression are not typed, etc. etc. etc.
689 This is simply a means of creating small constraint functions which
690 can be used to simplify your own type-checking code, with the added
691 side benefit of making your intentions clearer through self-documentation.
693 =head2 Slightly Less Important Caveat
695 It is B<always> a good idea to quote your type and subtype names.
697 This is to prevent perl from trying to execute the call as an indirect
698 object call. This issue only seems to come up when you have a subtype
699 the same name as a valid class, but when the issue does arise it tends
700 to be quite annoying to debug.
702 So for instance, this:
704 subtype DateTime => as Object => where { $_->isa('DateTime') };
706 will I<Just Work>, while this:
709 subtype DateTime => as Object => where { $_->isa('DateTime') };
711 will fail silently and cause many headaches. The simple way to solve
712 this, as well as future proof your subtypes from classes which have
713 yet to have been created yet, is to simply do this:
716 subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
718 =head2 Default Type Constraints
720 This module also provides a simple hierarchy for Perl 5 types, here is
721 that hierarchy represented visually.
745 B<NOTE:> Any type followed by a type parameter C<[`a]> can be
746 parameterized, this means you can say:
748 ArrayRef[Int] # an array of intergers
749 HashRef[CodeRef] # a hash of str to CODE ref mappings
750 Maybe[Str] # value may be a string, may be undefined
752 B<NOTE:> The C<Undef> type constraint for the most part works
753 correctly now, but edge cases may still exist, please use it
756 B<NOTE:> The C<ClassName> type constraint does a complex package
757 existence check. This means that your class B<must> be loaded for
758 this type constraint to pass. I know this is not ideal for all,
759 but it is a saner restriction than most others.
761 =head2 Type Constraint Naming
763 Since the types created by this module are global, it is suggested
764 that you namespace your types just as you would namespace your
765 modules. So instead of creating a I<Color> type for your B<My::Graphics>
766 module, you would call the type I<My::Graphics::Color> instead.
768 =head2 Use with Other Constraint Modules
770 This module should play fairly nicely with other constraint
771 modules with only some slight tweaking. The C<where> clause
772 in types is expected to be a C<CODE> reference which checks
773 it's first argument and returns a boolean. Since most constraint
774 modules work in a similar way, it should be simple to adapt
775 them to work with Moose.
777 For instance, this is how you could use it with
778 L<Declare::Constraints::Simple> to declare a completely new type.
780 type 'HashOfArrayOfObjects'
783 -values => IsArrayRef( IsObject ));
785 For more examples see the F<t/200_examples/204_example_w_DCS.t>
788 Here is an example of using L<Test::Deep> and it's non-test
789 related C<eq_deeply> function.
791 type 'ArrayOfHashOfBarsAndRandomNumbers'
794 array_each(subhashof({
796 random_number => ignore()
800 For a complete example see the
801 F<t/200_examples/205_example_w_TestDeep.t> test file.
805 =head2 Type Constraint Constructors
807 The following functions are used to create type constraints.
808 They will then register the type constraints in a global store
809 where Moose can get to them if it needs to.
811 See the L<SYNOPSIS> for an example of how to use these.
815 =item B<type ($name, $where_clause)>
817 This creates a base type, which has no parent.
819 =item B<subtype ($name, $parent, $where_clause, ?$message)>
821 This creates a named subtype.
823 =item B<subtype ($parent, $where_clause, ?$message)>
825 This creates an unnamed subtype and will return the type
826 constraint meta-object, which will be an instance of
827 L<Moose::Meta::TypeConstraint>.
829 =item B<class_type ($class, ?$options)>
831 Creates a type constraint with the name C<$class> and the metaclass
832 L<Moose::Meta::TypeConstraint::Class>.
834 =item B<role_type ($role, ?$options)>
836 Creates a type constraint with the name C<$role> and the metaclass
837 L<Moose::Meta::TypeConstraint::Role>.
839 =item B<enum ($name, @values)>
841 This will create a basic subtype for a given set of strings.
842 The resulting constraint will be a subtype of C<Str> and
843 will match any of the items in C<@values>. It is case sensitive.
844 See the L<SYNOPSIS> for a simple example.
846 B<NOTE:> This is not a true proper enum type, it is simple
847 a convient constraint builder.
849 =item B<enum (\@values)>
851 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
852 this will create an unnamed enum. This can then be used in an attribute
855 has 'sort_order' => (
857 isa => enum([qw[ ascending descending ]]),
862 This is just sugar for the type constraint construction syntax.
866 This is just sugar for the type constraint construction syntax.
870 This is just sugar for the type constraint construction syntax.
874 This can be used to define a "hand optimized" version of your
875 type constraint which can be used to avoid traversing a subtype
876 constraint heirarchy.
878 B<NOTE:> You should only use this if you know what you are doing,
879 all the built in types use this, so your subtypes (assuming they
880 are shallow) will not likely need to use this.
884 =head2 Type Coercion Constructors
886 Type constraints can also contain type coercions as well. If you
887 ask your accessor to coerce, then Moose will run the type-coercion
888 code first, followed by the type constraint check. This feature
889 should be used carefully as it is very powerful and could easily
890 take off a limb if you are not careful.
892 See the L<SYNOPSIS> for an example of how to use these.
900 This is just sugar for the type coercion construction syntax.
904 This is just sugar for the type coercion construction syntax.
908 =head2 Type Constraint Construction & Locating
912 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
914 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
915 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
917 =item B<create_parameterized_type_constraint ($type_name)>
919 Given a C<$type_name> in the form of:
921 BaseType[ContainerType]
923 this will extract the base type and container type and build an instance of
924 L<Moose::Meta::TypeConstraint::Parameterized> for it.
926 =item B<create_class_type_constraint ($class, ?$options)>
928 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
929 object for that class name.
931 =item B<create_role_type_constraint ($role, ?$options)>
933 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
934 object for that role name.
936 =item B<create_enum_type_constraint ($name, $values)>
938 =item B<find_or_parse_type_constraint ($type_name)>
940 This will attempt to find or create a type constraint given the a C<$type_name>.
941 If it cannot find it in the registry, it will see if it should be a union or
942 container type an create one if appropriate
944 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
946 This function will first call C<find_or_parse_type_constraint> with the type name.
948 If no type is found or created, but C<$options_for_anon_type> are provided, it
949 will create the corresponding type.
951 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
952 and are now superseded by C<find_or_create_isa_type_constraint> and
953 C<find_or_create_does_type_constraint>.
955 =item B<find_or_create_isa_type_constraint ($type_name)>
957 =item B<find_or_create_does_type_constraint ($type_name)>
959 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
960 no appropriate constraint is found will create a new anonymous one.
962 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
963 variant will use C<create_role_type_constraint>.
965 =item B<find_type_constraint ($type_name)>
967 This function can be used to locate a specific type constraint
968 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
969 derivative. What you do with it from there is up to you :)
971 =item B<register_type_constraint ($type_object)>
973 This function will register a named type constraint with the type registry.
975 =item B<get_type_constraint_registry>
977 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
978 keeps track of all type constraints.
980 =item B<list_all_type_constraints>
982 This will return a list of type constraint names, you can then
983 fetch them using C<find_type_constraint ($type_name)> if you
986 =item B<list_all_builtin_type_constraints>
988 This will return a list of builtin type constraints, meaning,
989 those which are defined in this module. See the section
990 labeled L<Default Type Constraints> for a complete list.
992 =item B<export_type_constraints_as_functions>
994 This will export all the current type constraints as functions
995 into the caller's namespace. Right now, this is mostly used for
996 testing, but it might prove useful to others.
998 =item B<get_all_parameterizable_types>
1000 This returns all the parameterizable types that have been registered.
1002 =item B<add_parameterizable_type ($type)>
1004 Adds C<$type> to the list of parameterizable types
1008 =head2 Namespace Management
1014 This will remove all the type constraint keywords from the
1015 calling class namespace.
1021 All complex software has bugs lurking in it, and this module is no
1022 exception. If you find a bug please either email me, or add the bug
1027 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1029 =head1 COPYRIGHT AND LICENSE
1031 Copyright 2006-2008 by Infinity Interactive, Inc.
1033 L<http://www.iinteractive.com>
1035 This library is free software; you can redistribute it and/or modify
1036 it under the same terms as Perl itself.