2 package Moose::Util::TypeConstraints;
8 use Scalar::Util 'blessed';
11 our $VERSION = '0.55_01';
12 $VERSION = eval $VERSION;
13 our $AUTHORITY = 'cpan:STEVAN';
15 ## --------------------------------------------------------
16 # Prototyped subs must be predeclared because we have a
17 # circular dependency with Moose::Meta::Attribute et. al.
18 # so in case of us being use'd first the predeclaration
19 # ensures the prototypes are in scope when consumers are
22 # creation and location
23 sub find_type_constraint ($);
24 sub register_type_constraint ($);
25 sub find_or_create_type_constraint ($;$);
26 sub find_or_parse_type_constraint ($);
27 sub find_or_create_isa_type_constraint ($);
28 sub find_or_create_does_type_constraint ($);
29 sub create_type_constraint_union (@);
30 sub create_parameterized_type_constraint ($);
31 sub create_class_type_constraint ($;$);
32 sub create_role_type_constraint ($;$);
33 sub create_enum_type_constraint ($$);
49 sub _create_type_constraint ($$$;$$);
50 sub _install_type_coercions ($$);
52 ## --------------------------------------------------------
54 use Moose::Meta::TypeConstraint;
55 use Moose::Meta::TypeConstraint::Union;
56 use Moose::Meta::TypeConstraint::Parameterized;
57 use Moose::Meta::TypeConstraint::Parameterizable;
58 use Moose::Meta::TypeConstraint::Class;
59 use Moose::Meta::TypeConstraint::Role;
60 use Moose::Meta::TypeConstraint::Enum;
61 use Moose::Meta::TypeCoercion;
62 use Moose::Meta::TypeCoercion::Union;
63 use Moose::Meta::TypeConstraint::Registry;
64 use Moose::Util::TypeConstraints::OptimizedConstraints;
66 Moose::Exporter->setup_import_methods(
69 type subtype class_type role_type as where message optimize_as
73 register_type_constraint )
78 ## --------------------------------------------------------
79 ## type registry and some useful functions for it
80 ## --------------------------------------------------------
82 my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new;
84 sub get_type_constraint_registry { $REGISTRY }
85 sub list_all_type_constraints { keys %{$REGISTRY->type_constraints} }
86 sub export_type_constraints_as_functions {
89 foreach my $constraint (keys %{$REGISTRY->type_constraints}) {
90 my $tc = $REGISTRY->get_type_constraint($constraint)->_compiled_type_constraint;
91 *{"${pkg}::${constraint}"} = sub { $tc->($_[0]) ? 1 : undef }; # the undef is for compat
95 sub create_type_constraint_union (@) {
96 my @type_constraint_names;
98 if (scalar @_ == 1 && _detect_type_constraint_union($_[0])) {
99 @type_constraint_names = _parse_type_constraint_union($_[0]);
102 @type_constraint_names = @_;
105 (scalar @type_constraint_names >= 2)
106 || confess "You must pass in at least 2 type names to make a union";
108 ($REGISTRY->has_type_constraint($_))
109 || confess "Could not locate type constraint ($_) for the union"
110 foreach @type_constraint_names;
112 return Moose::Meta::TypeConstraint::Union->new(
113 type_constraints => [
115 $REGISTRY->get_type_constraint($_)
116 } @type_constraint_names
121 sub create_parameterized_type_constraint ($) {
122 my $type_constraint_name = shift;
124 my ($base_type, $type_parameter) = _parse_parameterized_type_constraint($type_constraint_name);
126 (defined $base_type && defined $type_parameter)
127 || confess "Could not parse type name ($type_constraint_name) correctly";
129 ($REGISTRY->has_type_constraint($base_type))
130 || confess "Could not locate the base type ($base_type)";
132 return Moose::Meta::TypeConstraint::Parameterized->new(
133 name => $type_constraint_name,
134 parent => $REGISTRY->get_type_constraint($base_type),
135 type_parameter => find_or_create_isa_type_constraint($type_parameter),
139 #should we also support optimized checks?
140 sub create_class_type_constraint ($;$) {
141 my ( $class, $options ) = @_;
143 # too early for this check
144 #find_type_constraint("ClassName")->check($class)
145 # || confess "Can't create a class type constraint because '$class' is not a class name";
153 $options{name} ||= "__ANON__";
155 Moose::Meta::TypeConstraint::Class->new( %options );
158 sub create_role_type_constraint ($;$) {
159 my ( $role, $options ) = @_;
161 # too early for this check
162 #find_type_constraint("ClassName")->check($class)
163 # || confess "Can't create a class type constraint because '$class' is not a class name";
171 $options{name} ||= "__ANON__";
173 Moose::Meta::TypeConstraint::Role->new( %options );
177 sub find_or_create_type_constraint ($;$) {
178 my ( $type_constraint_name, $options_for_anon_type ) = @_;
180 if ( my $constraint = find_or_parse_type_constraint($type_constraint_name) ) {
183 elsif ( defined $options_for_anon_type ) {
185 # if there is no $options_for_anon_type
186 # specified, then we assume they don't
187 # want to create one, and return nothing.
189 # otherwise assume that we should create
190 # an ANON type with the $options_for_anon_type
191 # options which can be passed in. It should
192 # be noted that these don't get registered
193 # so we need to return it.
195 return Moose::Meta::TypeConstraint->new(
197 %{$options_for_anon_type}
204 sub find_or_create_isa_type_constraint ($) {
205 my $type_constraint_name = shift;
206 find_or_parse_type_constraint($type_constraint_name) || create_class_type_constraint($type_constraint_name)
209 sub find_or_create_does_type_constraint ($) {
210 my $type_constraint_name = shift;
211 find_or_parse_type_constraint($type_constraint_name) || create_role_type_constraint($type_constraint_name)
214 sub find_or_parse_type_constraint ($) {
215 my $type_constraint_name = shift;
217 return $REGISTRY->get_type_constraint($type_constraint_name)
218 if $REGISTRY->has_type_constraint($type_constraint_name);
222 if (_detect_type_constraint_union($type_constraint_name)) {
223 $constraint = create_type_constraint_union($type_constraint_name);
225 elsif (_detect_parameterized_type_constraint($type_constraint_name)) {
226 $constraint = create_parameterized_type_constraint($type_constraint_name);
231 $REGISTRY->add_type_constraint($constraint);
235 ## --------------------------------------------------------
236 ## exported functions ...
237 ## --------------------------------------------------------
239 sub find_type_constraint ($) {
242 if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) {
245 return $REGISTRY->get_type_constraint($type);
249 sub register_type_constraint ($) {
250 my $constraint = shift;
251 confess "can't register an unnamed type constraint" unless defined $constraint->name;
252 $REGISTRY->add_type_constraint($constraint);
259 splice(@_, 1, 0, undef);
260 goto &_create_type_constraint;
263 sub subtype ($$;$$$) {
265 # this adds an undef for the name
266 # if this is an anon-subtype:
267 # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype
268 # but if the last arg is not a code
269 # ref then it is a subtype alias:
270 # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num
271 # ... yeah I know it's ugly code
273 unshift @_ => undef if scalar @_ <= 2 && ('CODE' eq ref($_[1]));
274 goto &_create_type_constraint;
277 sub class_type ($;$) {
278 register_type_constraint(
279 create_class_type_constraint(
281 ( defined($_[1]) ? $_[1] : () ),
286 sub role_type ($;$) {
287 register_type_constraint(
288 create_role_type_constraint(
290 ( defined($_[1]) ? $_[1] : () ),
296 my ($type_name, @coercion_map) = @_;
297 _install_type_coercions($type_name, \@coercion_map);
301 sub from ($) { $_[0] }
302 sub where (&) { $_[0] }
303 sub via (&) { $_[0] }
305 sub message (&) { +{ message => $_[0] } }
306 sub optimize_as (&) { +{ optimized => $_[0] } }
309 my ($type_name, @values) = @_;
311 # if only an array-ref is passed then
312 # you get an anon-enum
314 if (ref $type_name eq 'ARRAY' && !@values) {
315 @values = @$type_name;
318 (scalar @values >= 2)
319 || confess "You must have at least two values to enumerate through";
320 my %valid = map { $_ => 1 } @values;
322 register_type_constraint(
323 create_enum_type_constraint(
330 sub create_enum_type_constraint ($$) {
331 my ( $type_name, $values ) = @_;
333 Moose::Meta::TypeConstraint::Enum->new(
334 name => $type_name || '__ANON__',
339 ## --------------------------------------------------------
340 ## desugaring functions ...
341 ## --------------------------------------------------------
343 sub _create_type_constraint ($$$;$$) {
348 my ($message, $optimized);
350 $message = $_->{message} if exists $_->{message};
351 $optimized = $_->{optimized} if exists $_->{optimized};
354 my $pkg_defined_in = scalar(caller(0));
357 my $type = $REGISTRY->get_type_constraint($name);
359 ($type->_package_defined_in eq $pkg_defined_in)
360 || confess ("The type constraint '$name' has already been created in "
361 . $type->_package_defined_in . " and cannot be created again in "
366 my $class = "Moose::Meta::TypeConstraint";
368 # FIXME should probably not be a special case
369 if ( defined $parent and $parent = find_or_parse_type_constraint($parent) ) {
370 $class = "Moose::Meta::TypeConstraint::Parameterizable"
371 if $parent->isa("Moose::Meta::TypeConstraint::Parameterizable");
374 my $constraint = $class->new(
375 name => $name || '__ANON__',
376 package_defined_in => $pkg_defined_in,
378 ($parent ? (parent => $parent ) : ()),
379 ($check ? (constraint => $check) : ()),
380 ($message ? (message => $message) : ()),
381 ($optimized ? (optimized => $optimized) : ()),
385 # if we have a type constraint union, and no
386 # type check, this means we are just aliasing
387 # the union constraint, which means we need to
388 # handle this differently.
390 if (not(defined $check)
391 && $parent->isa('Moose::Meta::TypeConstraint::Union')
392 && $parent->has_coercion
394 $constraint->coercion(Moose::Meta::TypeCoercion::Union->new(
395 type_constraint => $parent
399 $REGISTRY->add_type_constraint($constraint)
405 sub _install_type_coercions ($$) {
406 my ($type_name, $coercion_map) = @_;
407 my $type = find_type_constraint($type_name);
409 || confess "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+ (?: \[ (??{$any}) \] )? }x;
441 my $type_capture_parts = qr{ ($valid_chars+) (?: \[ ((??{$any})) \] )? }x;
442 my $type_with_parameter = qr{ $valid_chars+ \[ (??{$any}) \] }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 || confess "'$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 || confess "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 intergers
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:> The C<Undef> type constraint for the most part works
739 correctly now, but edge cases may still exist, please use it
742 B<NOTE:> The C<ClassName> type constraint does a complex package
743 existence check. This means that your class B<must> be loaded for
744 this type constraint to pass. I know this is not ideal for all,
745 but it is a saner restriction than most others.
747 =head2 Type Constraint Naming
749 Since the types created by this module are global, it is suggested
750 that you namespace your types just as you would namespace your
751 modules. So instead of creating a I<Color> type for your B<My::Graphics>
752 module, you would call the type I<My::Graphics::Color> instead.
754 =head2 Use with Other Constraint Modules
756 This module should play fairly nicely with other constraint
757 modules with only some slight tweaking. The C<where> clause
758 in types is expected to be a C<CODE> reference which checks
759 it's first argument and returns a boolean. Since most constraint
760 modules work in a similar way, it should be simple to adapt
761 them to work with Moose.
763 For instance, this is how you could use it with
764 L<Declare::Constraints::Simple> to declare a completely new type.
766 type 'HashOfArrayOfObjects'
769 -values => IsArrayRef( IsObject ));
771 For more examples see the F<t/200_examples/204_example_w_DCS.t>
774 Here is an example of using L<Test::Deep> and it's non-test
775 related C<eq_deeply> function.
777 type 'ArrayOfHashOfBarsAndRandomNumbers'
780 array_each(subhashof({
782 random_number => ignore()
786 For a complete example see the
787 F<t/200_examples/205_example_w_TestDeep.t> test file.
791 =head2 Type Constraint Constructors
793 The following functions are used to create type constraints.
794 They will then register the type constraints in a global store
795 where Moose can get to them if it needs to.
797 See the L<SYNOPSIS> for an example of how to use these.
801 =item B<type ($name, $where_clause)>
803 This creates a base type, which has no parent.
805 =item B<subtype ($name, $parent, $where_clause, ?$message)>
807 This creates a named subtype.
809 =item B<subtype ($parent, $where_clause, ?$message)>
811 This creates an unnamed subtype and will return the type
812 constraint meta-object, which will be an instance of
813 L<Moose::Meta::TypeConstraint>.
815 =item B<class_type ($class, ?$options)>
817 Creates a type constraint with the name C<$class> and the metaclass
818 L<Moose::Meta::TypeConstraint::Class>.
820 =item B<role_type ($role, ?$options)>
822 Creates a type constraint with the name C<$role> and the metaclass
823 L<Moose::Meta::TypeConstraint::Role>.
825 =item B<enum ($name, @values)>
827 This will create a basic subtype for a given set of strings.
828 The resulting constraint will be a subtype of C<Str> and
829 will match any of the items in C<@values>. It is case sensitive.
830 See the L<SYNOPSIS> for a simple example.
832 B<NOTE:> This is not a true proper enum type, it is simple
833 a convient constraint builder.
835 =item B<enum (\@values)>
837 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
838 this will create an unnamed enum. This can then be used in an attribute
841 has 'sort_order' => (
843 isa => enum([qw[ ascending descending ]]),
848 This is just sugar for the type constraint construction syntax.
852 This is just sugar for the type constraint construction syntax.
856 This is just sugar for the type constraint construction syntax.
860 This can be used to define a "hand optimized" version of your
861 type constraint which can be used to avoid traversing a subtype
862 constraint heirarchy.
864 B<NOTE:> You should only use this if you know what you are doing,
865 all the built in types use this, so your subtypes (assuming they
866 are shallow) will not likely need to use this.
870 =head2 Type Coercion Constructors
872 Type constraints can also contain type coercions as well. If you
873 ask your accessor to coerce, then Moose will run the type-coercion
874 code first, followed by the type constraint check. This feature
875 should be used carefully as it is very powerful and could easily
876 take off a limb if you are not careful.
878 See the L<SYNOPSIS> for an example of how to use these.
886 This is just sugar for the type coercion construction syntax.
890 This is just sugar for the type coercion construction syntax.
894 =head2 Type Constraint Construction & Locating
898 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
900 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
901 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
903 =item B<create_parameterized_type_constraint ($type_name)>
905 Given a C<$type_name> in the form of:
907 BaseType[ContainerType]
909 this will extract the base type and container type and build an instance of
910 L<Moose::Meta::TypeConstraint::Parameterized> for it.
912 =item B<create_class_type_constraint ($class, ?$options)>
914 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
915 object for that class name.
917 =item B<create_role_type_constraint ($role, ?$options)>
919 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
920 object for that role name.
922 =item B<create_enum_type_constraint ($name, $values)>
924 =item B<find_or_parse_type_constraint ($type_name)>
926 This will attempt to find or create a type constraint given the a C<$type_name>.
927 If it cannot find it in the registry, it will see if it should be a union or
928 container type an create one if appropriate
930 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
932 This function will first call C<find_or_parse_type_constraint> with the type name.
934 If no type is found or created, but C<$options_for_anon_type> are provided, it
935 will create the corresponding type.
937 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
938 and are now superseded by C<find_or_create_isa_type_constraint> and
939 C<find_or_create_does_type_constraint>.
941 =item B<find_or_create_isa_type_constraint ($type_name)>
943 =item B<find_or_create_does_type_constraint ($type_name)>
945 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
946 no appropriate constraint is found will create a new anonymous one.
948 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
949 variant will use C<create_role_type_constraint>.
951 =item B<find_type_constraint ($type_name)>
953 This function can be used to locate a specific type constraint
954 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
955 derivative. What you do with it from there is up to you :)
957 =item B<register_type_constraint ($type_object)>
959 This function will register a named type constraint with the type registry.
961 =item B<get_type_constraint_registry>
963 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
964 keeps track of all type constraints.
966 =item B<list_all_type_constraints>
968 This will return a list of type constraint names, you can then
969 fetch them using C<find_type_constraint ($type_name)> if you
972 =item B<list_all_builtin_type_constraints>
974 This will return a list of builtin type constraints, meaning,
975 those which are defined in this module. See the section
976 labeled L<Default Type Constraints> for a complete list.
978 =item B<export_type_constraints_as_functions>
980 This will export all the current type constraints as functions
981 into the caller's namespace. Right now, this is mostly used for
982 testing, but it might prove useful to others.
984 =item B<get_all_parameterizable_types>
986 This returns all the parameterizable types that have been registered.
988 =item B<add_parameterizable_type ($type)>
990 Adds C<$type> to the list of parameterizable types
994 =head2 Namespace Management
1000 This will remove all the type constraint keywords from the
1001 calling class namespace.
1007 All complex software has bugs lurking in it, and this module is no
1008 exception. If you find a bug please either email me, or add the bug
1013 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1015 =head1 COPYRIGHT AND LICENSE
1017 Copyright 2006-2008 by Infinity Interactive, Inc.
1019 L<http://www.iinteractive.com>
1021 This library is free software; you can redistribute it and/or modify
1022 it under the same terms as Perl itself.