2 package Moose::Util::TypeConstraints;
8 use List::MoreUtils qw( all );
9 use Scalar::Util 'blessed';
12 our $VERSION = '0.60';
13 $VERSION = eval $VERSION;
14 our $AUTHORITY = 'cpan:STEVAN';
16 ## --------------------------------------------------------
17 # Prototyped subs must be predeclared because we have a
18 # circular dependency with Moose::Meta::Attribute et. al.
19 # so in case of us being use'd first the predeclaration
20 # ensures the prototypes are in scope when consumers are
30 sub _create_type_constraint ($$$;$$);
31 sub _install_type_coercions ($$);
33 ## --------------------------------------------------------
35 use Moose::Meta::TypeConstraint;
36 use Moose::Meta::TypeConstraint::Union;
37 use Moose::Meta::TypeConstraint::Parameterized;
38 use Moose::Meta::TypeConstraint::Parameterizable;
39 use Moose::Meta::TypeConstraint::Class;
40 use Moose::Meta::TypeConstraint::Role;
41 use Moose::Meta::TypeConstraint::Enum;
42 use Moose::Meta::TypeCoercion;
43 use Moose::Meta::TypeCoercion::Union;
44 use Moose::Meta::TypeConstraint::Registry;
45 use Moose::Util::TypeConstraints::OptimizedConstraints;
47 Moose::Exporter->setup_import_methods(
50 type subtype class_type role_type as where message optimize_as
54 register_type_constraint )
59 ## --------------------------------------------------------
60 ## type registry and some useful functions for it
61 ## --------------------------------------------------------
63 my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new;
65 sub get_type_constraint_registry { $REGISTRY }
66 sub list_all_type_constraints { keys %{$REGISTRY->type_constraints} }
67 sub export_type_constraints_as_functions {
70 foreach my $constraint (keys %{$REGISTRY->type_constraints}) {
71 my $tc = $REGISTRY->get_type_constraint($constraint)->_compiled_type_constraint;
72 *{"${pkg}::${constraint}"} = sub { $tc->($_[0]) ? 1 : undef }; # the undef is for compat
76 sub create_type_constraint_union {
77 my @type_constraint_names;
79 if (scalar @_ == 1 && _detect_type_constraint_union($_[0])) {
80 @type_constraint_names = _parse_type_constraint_union($_[0]);
83 @type_constraint_names = @_;
86 (scalar @type_constraint_names >= 2)
87 || Moose->throw_error("You must pass in at least 2 type names to make a union");
89 my @type_constraints = map {
90 find_or_parse_type_constraint($_) ||
91 Moose->throw_error("Could not locate type constraint ($_) for the union");
92 } @type_constraint_names;
94 return Moose::Meta::TypeConstraint::Union->new(
95 type_constraints => \@type_constraints
99 sub create_parameterized_type_constraint {
100 my $type_constraint_name = shift;
101 my ($base_type, $type_parameter) = _parse_parameterized_type_constraint($type_constraint_name);
103 (defined $base_type && defined $type_parameter)
104 || Moose->throw_error("Could not parse type name ($type_constraint_name) correctly");
106 if ($REGISTRY->has_type_constraint($base_type)) {
107 my $base_type_tc = $REGISTRY->get_type_constraint($base_type);
108 return _create_parameterized_type_constraint(
113 Moose->throw_error("Could not locate the base type ($base_type)");
117 sub _create_parameterized_type_constraint {
118 my ( $base_type_tc, $type_parameter ) = @_;
119 if ( $base_type_tc->can('parameterize') ) {
120 return $base_type_tc->parameterize($type_parameter);
122 return Moose::Meta::TypeConstraint::Parameterized->new(
123 name => $base_type_tc->name . '[' . $type_parameter . ']',
124 parent => $base_type_tc,
125 type_parameter => find_or_create_isa_type_constraint($type_parameter),
130 #should we also support optimized checks?
131 sub create_class_type_constraint {
132 my ( $class, $options ) = @_;
134 # too early for this check
135 #find_type_constraint("ClassName")->check($class)
136 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
144 $options{name} ||= "__ANON__";
146 Moose::Meta::TypeConstraint::Class->new( %options );
149 sub create_role_type_constraint {
150 my ( $role, $options ) = @_;
152 # too early for this check
153 #find_type_constraint("ClassName")->check($class)
154 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
162 $options{name} ||= "__ANON__";
164 Moose::Meta::TypeConstraint::Role->new( %options );
168 sub find_or_create_type_constraint {
169 my ( $type_constraint_name, $options_for_anon_type ) = @_;
171 if ( my $constraint = find_or_parse_type_constraint($type_constraint_name) ) {
174 elsif ( defined $options_for_anon_type ) {
176 # if there is no $options_for_anon_type
177 # specified, then we assume they don't
178 # want to create one, and return nothing.
180 # otherwise assume that we should create
181 # an ANON type with the $options_for_anon_type
182 # options which can be passed in. It should
183 # be noted that these don't get registered
184 # so we need to return it.
186 return Moose::Meta::TypeConstraint->new(
188 %{$options_for_anon_type}
195 sub find_or_create_isa_type_constraint {
196 my $type_constraint_name = shift;
197 find_or_parse_type_constraint($type_constraint_name) || create_class_type_constraint($type_constraint_name)
200 sub find_or_create_does_type_constraint {
201 my $type_constraint_name = shift;
202 find_or_parse_type_constraint($type_constraint_name) || create_role_type_constraint($type_constraint_name)
205 sub find_or_parse_type_constraint {
206 my $type_constraint_name = normalize_type_constraint_name(shift);
209 if ($constraint = find_type_constraint($type_constraint_name)) {
211 } elsif (_detect_type_constraint_union($type_constraint_name)) {
212 $constraint = create_type_constraint_union($type_constraint_name);
213 } elsif (_detect_parameterized_type_constraint($type_constraint_name)) {
214 $constraint = create_parameterized_type_constraint($type_constraint_name);
219 $REGISTRY->add_type_constraint($constraint);
223 sub normalize_type_constraint_name {
224 my $type_constraint_name = shift;
225 $type_constraint_name =~ s/\s//g;
226 return $type_constraint_name;
232 local $Carp::CarpLevel = $Carp::CarpLevel + 1;
233 Carp::confess($error);
236 ## --------------------------------------------------------
237 ## exported functions ...
238 ## --------------------------------------------------------
240 sub find_type_constraint {
243 if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) {
247 return unless $REGISTRY->has_type_constraint($type);
248 return $REGISTRY->get_type_constraint($type);
252 sub register_type_constraint {
253 my $constraint = shift;
254 Moose->throw_error("can't register an unnamed type constraint") unless defined $constraint->name;
255 $REGISTRY->add_type_constraint($constraint);
262 splice(@_, 1, 0, undef);
263 goto &_create_type_constraint;
268 # this adds an undef for the name
269 # if this is an anon-subtype:
270 # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype
272 # subtype(Num => where { $_ % 2 == 0 }) message { "$_ must be an even number" }
274 # but if the last arg is not a code ref then it is a subtype
277 # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num
278 # ... yeah I know it's ugly code
280 unshift @_ => undef if scalar @_ == 2 && ( 'CODE' eq ref( $_[-1] ) );
282 if scalar @_ == 3 && all { ref($_) =~ /^(?:CODE|HASH)$/ } @_[ 1, 2 ];
283 goto &_create_type_constraint;
287 register_type_constraint(
288 create_class_type_constraint(
290 ( defined($_[1]) ? $_[1] : () ),
295 sub role_type ($;$) {
296 register_type_constraint(
297 create_role_type_constraint(
299 ( defined($_[1]) ? $_[1] : () ),
305 my ($type_name, @coercion_map) = @_;
306 _install_type_coercions($type_name, \@coercion_map);
311 sub where (&) { $_[0] }
312 sub via (&) { $_[0] }
314 sub message (&) { +{ message => $_[0] } }
315 sub optimize_as (&) { +{ optimized => $_[0] } }
318 my ($type_name, @values) = @_;
320 # if only an array-ref is passed then
321 # you get an anon-enum
323 if (ref $type_name eq 'ARRAY' && !@values) {
324 @values = @$type_name;
327 (scalar @values >= 2)
328 || Moose->throw_error("You must have at least two values to enumerate through");
329 my %valid = map { $_ => 1 } @values;
331 register_type_constraint(
332 create_enum_type_constraint(
339 sub create_enum_type_constraint {
340 my ( $type_name, $values ) = @_;
342 Moose::Meta::TypeConstraint::Enum->new(
343 name => $type_name || '__ANON__',
348 ## --------------------------------------------------------
349 ## desugaring functions ...
350 ## --------------------------------------------------------
352 sub _create_type_constraint ($$$;$$) {
357 my ( $message, $optimized );
359 $message = $_->{message} if exists $_->{message};
360 $optimized = $_->{optimized} if exists $_->{optimized};
363 my $pkg_defined_in = scalar( caller(0) );
365 if ( defined $name ) {
366 my $type = $REGISTRY->get_type_constraint($name);
368 ( $type->_package_defined_in eq $pkg_defined_in )
370 "The type constraint '$name' has already been created in "
371 . $type->_package_defined_in
372 . " and cannot be created again in "
377 $name = $name ? "$name" : "__ANON__";
381 package_defined_in => $pkg_defined_in,
383 ( $check ? ( constraint => $check ) : () ),
384 ( $message ? ( message => $message ) : () ),
385 ( $optimized ? ( optimized => $optimized ) : () ),
391 = blessed $parent ? $parent : find_or_parse_type_constraint($parent) )
393 $constraint = $parent->create_child_type(%opts);
396 $constraint = Moose::Meta::TypeConstraint->new(%opts);
399 $REGISTRY->add_type_constraint($constraint)
405 sub _install_type_coercions ($$) {
406 my ($type_name, $coercion_map) = @_;
407 my $type = find_type_constraint($type_name);
409 || Moose->throw_error("Cannot find type '$type_name', perhaps you forgot to load it.");
410 if ($type->has_coercion) {
411 $type->coercion->add_type_coercions(@$coercion_map);
414 my $type_coercion = Moose::Meta::TypeCoercion->new(
415 type_coercion_map => $coercion_map,
416 type_constraint => $type
418 $type->coercion($type_coercion);
422 ## --------------------------------------------------------
423 ## type notation parsing ...
424 ## --------------------------------------------------------
427 # All I have to say is mugwump++ cause I know
428 # do not even have enough regexp-fu to be able
429 # to have written this (I can only barely
430 # understand it as it is)
435 my $valid_chars = qr{[\w:]};
436 my $type_atom = qr{ $valid_chars+ };
440 my $type = qr{ $valid_chars+ (?: \[ \s* (??{$any}) \s* \] )? }x;
441 my $type_capture_parts = qr{ ($valid_chars+) (?: \[ \s* ((??{$any})) \s* \] )? }x;
442 my $type_with_parameter = qr{ $valid_chars+ \[ \s* (??{$any}) \s* \] }x;
444 my $op_union = qr{ \s* \| \s* }x;
445 my $union = qr{ $type (?: $op_union $type )+ }x;
447 $any = qr{ $type | $union }x;
449 sub _parse_parameterized_type_constraint {
450 { no warnings 'void'; $any; } # force capture of interpolated lexical
451 $_[0] =~ m{ $type_capture_parts }x;
455 sub _detect_parameterized_type_constraint {
456 { no warnings 'void'; $any; } # force capture of interpolated lexical
457 $_[0] =~ m{ ^ $type_with_parameter $ }x;
460 sub _parse_type_constraint_union {
461 { no warnings 'void'; $any; } # force capture of interpolated lexical
464 while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) {
467 (pos($given) eq length($given))
468 || Moose->throw_error("'$given' didn't parse (parse-pos="
476 sub _detect_type_constraint_union {
477 { no warnings 'void'; $any; } # force capture of interpolated lexical
478 $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x;
482 ## --------------------------------------------------------
483 # define some basic built-in types
484 ## --------------------------------------------------------
486 type 'Any' => where { 1 }; # meta-type including all
487 type 'Item' => where { 1 }; # base-type
489 subtype 'Undef' => as 'Item' => where { !defined($_) };
490 subtype 'Defined' => as 'Item' => where { defined($_) };
494 => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' };
498 => where { !ref($_) }
499 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Value;
504 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Ref;
509 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Str;
513 => where { Scalar::Util::looks_like_number($_) }
514 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Num;
518 => where { "$_" =~ /^-?[0-9]+$/ }
519 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Int;
521 subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ScalarRef;
522 subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::CodeRef;
523 subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::RegexpRef;
524 subtype 'GlobRef' => as 'Ref' => where { ref($_) eq 'GLOB' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::GlobRef;
527 # scalar filehandles are GLOB refs,
528 # but a GLOB ref is not always a filehandle
531 => where { Scalar::Util::openhandle($_) || ( blessed($_) && $_->isa("IO::Handle") ) }
532 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::FileHandle;
535 # blessed(qr/.../) returns true,.. how odd
538 => where { blessed($_) && blessed($_) ne 'Regexp' }
539 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Object;
543 => where { $_->can('does') }
544 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Role;
546 my $_class_name_checker = sub {
551 => where { Class::MOP::is_class_loaded($_) }
552 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ClassName;
554 ## --------------------------------------------------------
555 # parameterizable types ...
557 $REGISTRY->add_type_constraint(
558 Moose::Meta::TypeConstraint::Parameterizable->new(
560 package_defined_in => __PACKAGE__,
561 parent => find_type_constraint('Ref'),
562 constraint => sub { ref($_) eq 'ARRAY' },
563 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef,
564 constraint_generator => sub {
565 my $type_parameter = shift;
566 my $check = $type_parameter->_compiled_type_constraint;
568 foreach my $x (@$_) {
569 ($check->($x)) || return
576 $REGISTRY->add_type_constraint(
577 Moose::Meta::TypeConstraint::Parameterizable->new(
579 package_defined_in => __PACKAGE__,
580 parent => find_type_constraint('Ref'),
581 constraint => sub { ref($_) eq 'HASH' },
582 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef,
583 constraint_generator => sub {
584 my $type_parameter = shift;
585 my $check = $type_parameter->_compiled_type_constraint;
587 foreach my $x (values %$_) {
588 ($check->($x)) || return
595 $REGISTRY->add_type_constraint(
596 Moose::Meta::TypeConstraint::Parameterizable->new(
598 package_defined_in => __PACKAGE__,
599 parent => find_type_constraint('Item'),
600 constraint => sub { 1 },
601 constraint_generator => sub {
602 my $type_parameter = shift;
603 my $check = $type_parameter->_compiled_type_constraint;
605 return 1 if not(defined($_)) || $check->($_);
612 my @PARAMETERIZABLE_TYPES = map {
613 $REGISTRY->get_type_constraint($_)
614 } qw[ArrayRef HashRef Maybe];
616 sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES }
617 sub add_parameterizable_type {
619 (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable'))
620 || Moose->throw_error("Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type");
621 push @PARAMETERIZABLE_TYPES => $type;
624 ## --------------------------------------------------------
625 # end of built-in types ...
626 ## --------------------------------------------------------
629 my @BUILTINS = list_all_type_constraints();
630 sub list_all_builtin_type_constraints { @BUILTINS }
641 Moose::Util::TypeConstraints - Type constraint system for Moose
645 use Moose::Util::TypeConstraints;
647 type 'Num' => where { Scalar::Util::looks_like_number($_) };
653 subtype 'NaturalLessThanTen'
656 => message { "This number ($_) is not less than ten!" };
662 enum 'RGBColors' => qw(red green blue);
666 This module provides Moose with the ability to create custom type
667 contraints to be used in attribute definition.
669 =head2 Important Caveat
671 This is B<NOT> a type system for Perl 5. These are type constraints,
672 and they are not used by Moose unless you tell it to. No type
673 inference is performed, expression are not typed, etc. etc. etc.
675 This is simply a means of creating small constraint functions which
676 can be used to simplify your own type-checking code, with the added
677 side benefit of making your intentions clearer through self-documentation.
679 =head2 Slightly Less Important Caveat
681 It is B<always> a good idea to quote your type and subtype names.
683 This is to prevent perl from trying to execute the call as an indirect
684 object call. This issue only seems to come up when you have a subtype
685 the same name as a valid class, but when the issue does arise it tends
686 to be quite annoying to debug.
688 So for instance, this:
690 subtype DateTime => as Object => where { $_->isa('DateTime') };
692 will I<Just Work>, while this:
695 subtype DateTime => as Object => where { $_->isa('DateTime') };
697 will fail silently and cause many headaches. The simple way to solve
698 this, as well as future proof your subtypes from classes which have
699 yet to have been created yet, is to simply do this:
702 subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
704 =head2 Default Type Constraints
706 This module also provides a simple hierarchy for Perl 5 types, here is
707 that hierarchy represented visually.
731 B<NOTE:> Any type followed by a type parameter C<[`a]> can be
732 parameterized, this means you can say:
734 ArrayRef[Int] # an array of integers
735 HashRef[CodeRef] # a hash of str to CODE ref mappings
736 Maybe[Str] # value may be a string, may be undefined
738 B<NOTE:> Unless you parameterize a type, then it is invalid to
739 include the square brackets. I.e. C<ArrayRef[]> will be
740 literally interpreted as a type name.
742 B<NOTE:> The C<Undef> type constraint for the most part works
743 correctly now, but edge cases may still exist, please use it
746 B<NOTE:> The C<ClassName> type constraint does a complex package
747 existence check. This means that your class B<must> be loaded for
748 this type constraint to pass. I know this is not ideal for all,
749 but it is a saner restriction than most others.
751 =head2 Type Constraint Naming
753 Since the types created by this module are global, it is suggested
754 that you namespace your types just as you would namespace your
755 modules. So instead of creating a I<Color> type for your B<My::Graphics>
756 module, you would call the type I<My::Graphics::Color> instead.
758 =head2 Use with Other Constraint Modules
760 This module should play fairly nicely with other constraint
761 modules with only some slight tweaking. The C<where> clause
762 in types is expected to be a C<CODE> reference which checks
763 it's first argument and returns a boolean. Since most constraint
764 modules work in a similar way, it should be simple to adapt
765 them to work with Moose.
767 For instance, this is how you could use it with
768 L<Declare::Constraints::Simple> to declare a completely new type.
770 type 'HashOfArrayOfObjects'
773 -values => IsArrayRef( IsObject ));
775 For more examples see the F<t/200_examples/204_example_w_DCS.t>
778 Here is an example of using L<Test::Deep> and it's non-test
779 related C<eq_deeply> function.
781 type 'ArrayOfHashOfBarsAndRandomNumbers'
784 array_each(subhashof({
786 random_number => ignore()
790 For a complete example see the
791 F<t/200_examples/205_example_w_TestDeep.t> test file.
795 =head2 Type Constraint Constructors
797 The following functions are used to create type constraints.
798 They will then register the type constraints in a global store
799 where Moose can get to them if it needs to.
801 See the L<SYNOPSIS> for an example of how to use these.
805 =item B<type ($name, $where_clause)>
807 This creates a base type, which has no parent.
809 =item B<subtype ($name, $parent, $where_clause, ?$message)>
811 This creates a named subtype.
813 =item B<subtype ($parent, $where_clause, ?$message)>
815 This creates an unnamed subtype and will return the type
816 constraint meta-object, which will be an instance of
817 L<Moose::Meta::TypeConstraint>.
819 =item B<class_type ($class, ?$options)>
821 Creates a type constraint with the name C<$class> and the metaclass
822 L<Moose::Meta::TypeConstraint::Class>.
824 =item B<role_type ($role, ?$options)>
826 Creates a type constraint with the name C<$role> and the metaclass
827 L<Moose::Meta::TypeConstraint::Role>.
829 =item B<enum ($name, @values)>
831 This will create a basic subtype for a given set of strings.
832 The resulting constraint will be a subtype of C<Str> and
833 will match any of the items in C<@values>. It is case sensitive.
834 See the L<SYNOPSIS> for a simple example.
836 B<NOTE:> This is not a true proper enum type, it is simple
837 a convient constraint builder.
839 =item B<enum (\@values)>
841 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
842 this will create an unnamed enum. This can then be used in an attribute
845 has 'sort_order' => (
847 isa => enum([qw[ ascending descending ]]),
852 This is just sugar for the type constraint construction syntax.
856 This is just sugar for the type constraint construction syntax.
858 Takes a block/code ref as an argument. When the type constraint is
859 tested, the supplied code is run with the value to be tested in
860 $_. This block should return true or false to indicate whether or not
861 the constraint check passed.
865 This is just sugar for the type constraint construction syntax.
867 Takes a block/code ref as an argument. When the type constraint fails,
868 then the code block is run (with the value provided in $_). This code
869 ref should return a string, which will be used in the text of the
874 This can be used to define a "hand optimized" version of your
875 type constraint which can be used to avoid traversing a subtype
876 constraint heirarchy.
878 B<NOTE:> You should only use this if you know what you are doing,
879 all the built in types use this, so your subtypes (assuming they
880 are shallow) will not likely need to use this.
884 =head2 Type Coercion Constructors
886 Type constraints can also contain type coercions as well. If you
887 ask your accessor to coerce, then Moose will run the type-coercion
888 code first, followed by the type constraint check. This feature
889 should be used carefully as it is very powerful and could easily
890 take off a limb if you are not careful.
892 See the L<SYNOPSIS> for an example of how to use these.
900 This is just sugar for the type coercion construction syntax.
904 This is just sugar for the type coercion construction syntax.
908 =head2 Type Constraint Construction & Locating
912 =item B<normalize_type_constraint_name ($type_constraint_name)>
914 Given a string that is expected to match a type constraint, will normalize the
915 string so that extra whitespace and newlines are removed.
917 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
919 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
920 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
922 =item B<create_parameterized_type_constraint ($type_name)>
924 Given a C<$type_name> in the form of:
926 BaseType[ContainerType]
928 this will extract the base type and container type and build an instance of
929 L<Moose::Meta::TypeConstraint::Parameterized> for it.
931 =item B<create_class_type_constraint ($class, ?$options)>
933 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
934 object for that class name.
936 =item B<create_role_type_constraint ($role, ?$options)>
938 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
939 object for that role name.
941 =item B<create_enum_type_constraint ($name, $values)>
943 =item B<find_or_parse_type_constraint ($type_name)>
945 This will attempt to find or create a type constraint given the a C<$type_name>.
946 If it cannot find it in the registry, it will see if it should be a union or
947 container type an create one if appropriate
949 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
951 This function will first call C<find_or_parse_type_constraint> with the type name.
953 If no type is found or created, but C<$options_for_anon_type> are provided, it
954 will create the corresponding type.
956 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
957 and are now superseded by C<find_or_create_isa_type_constraint> and
958 C<find_or_create_does_type_constraint>.
960 =item B<find_or_create_isa_type_constraint ($type_name)>
962 =item B<find_or_create_does_type_constraint ($type_name)>
964 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
965 no appropriate constraint is found will create a new anonymous one.
967 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
968 variant will use C<create_role_type_constraint>.
970 =item B<find_type_constraint ($type_name)>
972 This function can be used to locate a specific type constraint
973 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
974 derivative. What you do with it from there is up to you :)
976 =item B<register_type_constraint ($type_object)>
978 This function will register a named type constraint with the type registry.
980 =item B<get_type_constraint_registry>
982 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
983 keeps track of all type constraints.
985 =item B<list_all_type_constraints>
987 This will return a list of type constraint names, you can then
988 fetch them using C<find_type_constraint ($type_name)> if you
991 =item B<list_all_builtin_type_constraints>
993 This will return a list of builtin type constraints, meaning,
994 those which are defined in this module. See the section
995 labeled L<Default Type Constraints> for a complete list.
997 =item B<export_type_constraints_as_functions>
999 This will export all the current type constraints as functions
1000 into the caller's namespace. Right now, this is mostly used for
1001 testing, but it might prove useful to others.
1003 =item B<get_all_parameterizable_types>
1005 This returns all the parameterizable types that have been registered.
1007 =item B<add_parameterizable_type ($type)>
1009 Adds C<$type> to the list of parameterizable types
1013 =head2 Namespace Management
1019 This will remove all the type constraint keywords from the
1020 calling class namespace.
1026 All complex software has bugs lurking in it, and this module is no
1027 exception. If you find a bug please either email me, or add the bug
1032 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1034 =head1 COPYRIGHT AND LICENSE
1036 Copyright 2006-2008 by Infinity Interactive, Inc.
1038 L<http://www.iinteractive.com>
1040 This library is free software; you can redistribute it and/or modify
1041 it under the same terms as Perl itself.