2 package Moose::Util::TypeConstraints;
8 use Scalar::Util 'blessed';
11 our $VERSION = '0.57';
12 $VERSION = eval $VERSION;
13 our $AUTHORITY = 'cpan:STEVAN';
15 ## --------------------------------------------------------
16 # Prototyped subs must be predeclared because we have a
17 # circular dependency with Moose::Meta::Attribute et. al.
18 # so in case of us being use'd first the predeclaration
19 # ensures the prototypes are in scope when consumers are
29 sub _create_type_constraint ($$$;$$);
30 sub _install_type_coercions ($$);
32 ## --------------------------------------------------------
34 use Moose::Meta::TypeConstraint;
35 use Moose::Meta::TypeConstraint::Union;
36 use Moose::Meta::TypeConstraint::Parameterized;
37 use Moose::Meta::TypeConstraint::Parameterizable;
38 use Moose::Meta::TypeConstraint::Class;
39 use Moose::Meta::TypeConstraint::Role;
40 use Moose::Meta::TypeConstraint::Enum;
41 use Moose::Meta::TypeCoercion;
42 use Moose::Meta::TypeCoercion::Union;
43 use Moose::Meta::TypeConstraint::Registry;
44 use Moose::Util::TypeConstraints::OptimizedConstraints;
46 Moose::Exporter->setup_import_methods(
49 type subtype class_type role_type as where message optimize_as
53 register_type_constraint )
58 ## --------------------------------------------------------
59 ## type registry and some useful functions for it
60 ## --------------------------------------------------------
62 my $REGISTRY = Moose::Meta::TypeConstraint::Registry->new;
64 sub get_type_constraint_registry { $REGISTRY }
65 sub list_all_type_constraints { keys %{$REGISTRY->type_constraints} }
66 sub export_type_constraints_as_functions {
69 foreach my $constraint (keys %{$REGISTRY->type_constraints}) {
70 my $tc = $REGISTRY->get_type_constraint($constraint)->_compiled_type_constraint;
71 *{"${pkg}::${constraint}"} = sub { $tc->($_[0]) ? 1 : undef }; # the undef is for compat
75 sub create_type_constraint_union {
76 my @type_constraint_names;
78 if (scalar @_ == 1 && _detect_type_constraint_union($_[0])) {
79 @type_constraint_names = _parse_type_constraint_union($_[0]);
82 @type_constraint_names = @_;
85 (scalar @type_constraint_names >= 2)
86 || Moose->throw_error("You must pass in at least 2 type names to make a union");
88 my @type_constraints = sort {$a->name cmp $b->name} map {
89 find_or_parse_type_constraint($_) ||
90 Moose->throw_error("Could not locate type constraint ($_) for the union");
91 } @type_constraint_names;
93 return Moose::Meta::TypeConstraint::Union->new(
94 type_constraints => \@type_constraints
98 sub create_parameterized_type_constraint {
99 my $type_constraint_name = shift;
100 my ($base_type, $type_parameter) = _parse_parameterized_type_constraint($type_constraint_name);
102 (defined $base_type && defined $type_parameter)
103 || Moose->throw_error("Could not parse type name ($type_constraint_name) correctly");
105 if ($REGISTRY->has_type_constraint($base_type)) {
106 my $base_type_tc = $REGISTRY->get_type_constraint($base_type);
107 return _create_parameterized_type_constraint(
112 Moose->throw_error("Could not locate the base type ($base_type)");
116 sub _create_parameterized_type_constraint {
117 my ( $base_type_tc, $type_parameter ) = @_;
118 if ( $base_type_tc->can('parameterize') ) {
119 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,
126 find_or_create_isa_type_constraint($type_parameter),
131 #should we also support optimized checks?
132 sub create_class_type_constraint {
133 my ( $class, $options ) = @_;
135 # too early for this check
136 #find_type_constraint("ClassName")->check($class)
137 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
145 $options{name} ||= "__ANON__";
147 Moose::Meta::TypeConstraint::Class->new( %options );
150 sub create_role_type_constraint {
151 my ( $role, $options ) = @_;
153 # too early for this check
154 #find_type_constraint("ClassName")->check($class)
155 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
163 $options{name} ||= "__ANON__";
165 Moose::Meta::TypeConstraint::Role->new( %options );
169 sub find_or_create_type_constraint {
170 my ( $type_constraint_name, $options_for_anon_type ) = @_;
172 if ( my $constraint = find_or_parse_type_constraint($type_constraint_name) ) {
175 elsif ( defined $options_for_anon_type ) {
177 # if there is no $options_for_anon_type
178 # specified, then we assume they don't
179 # want to create one, and return nothing.
181 # otherwise assume that we should create
182 # an ANON type with the $options_for_anon_type
183 # options which can be passed in. It should
184 # be noted that these don't get registered
185 # so we need to return it.
187 return Moose::Meta::TypeConstraint->new(
189 %{$options_for_anon_type}
196 sub find_or_create_isa_type_constraint {
197 my $type_constraint_name = shift;
198 find_or_parse_type_constraint($type_constraint_name) || create_class_type_constraint($type_constraint_name)
201 sub find_or_create_does_type_constraint {
202 my $type_constraint_name = shift;
203 find_or_parse_type_constraint($type_constraint_name) || create_role_type_constraint($type_constraint_name)
206 sub find_or_parse_type_constraint {
207 my $type_constraint_name = normalize_type_constraint_name(shift);
210 if ($constraint = find_type_constraint($type_constraint_name)) {
212 } elsif (_detect_type_constraint_union($type_constraint_name)) {
213 $constraint = create_type_constraint_union($type_constraint_name);
214 } elsif (_detect_parameterized_type_constraint($type_constraint_name)) {
215 $constraint = create_parameterized_type_constraint($type_constraint_name);
220 $REGISTRY->add_type_constraint($constraint);
224 sub normalize_type_constraint_name {
225 my $type_constraint_name = shift @_;
226 $type_constraint_name =~ s/\s//g;
227 return $type_constraint_name;
230 ## --------------------------------------------------------
231 ## exported functions ...
232 ## --------------------------------------------------------
234 sub find_type_constraint {
237 if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) {
241 return unless $REGISTRY->has_type_constraint($type);
242 return $REGISTRY->get_type_constraint($type);
246 sub register_type_constraint {
247 my $constraint = shift;
248 Moose->throw_error("can't register an unnamed type constraint") unless defined $constraint->name;
249 $REGISTRY->add_type_constraint($constraint);
256 splice(@_, 1, 0, undef);
257 goto &_create_type_constraint;
262 # this adds an undef for the name
263 # if this is an anon-subtype:
264 # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype
265 # but if the last arg is not a code
266 # ref then it is a subtype alias:
267 # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num
268 # ... yeah I know it's ugly code
270 unshift @_ => undef if scalar @_ <= 2 && ('CODE' eq ref($_[1]));
271 goto &_create_type_constraint;
275 register_type_constraint(
276 create_class_type_constraint(
278 ( defined($_[1]) ? $_[1] : () ),
283 sub role_type ($;$) {
284 register_type_constraint(
285 create_role_type_constraint(
287 ( defined($_[1]) ? $_[1] : () ),
293 my ($type_name, @coercion_map) = @_;
294 _install_type_coercions($type_name, \@coercion_map);
299 sub where (&) { $_[0] }
300 sub via (&) { $_[0] }
302 sub message (&) { +{ message => $_[0] } }
303 sub optimize_as (&) { +{ optimized => $_[0] } }
306 my ($type_name, @values) = @_;
308 # if only an array-ref is passed then
309 # you get an anon-enum
311 if (ref $type_name eq 'ARRAY' && !@values) {
312 @values = @$type_name;
315 (scalar @values >= 2)
316 || Moose->throw_error("You must have at least two values to enumerate through");
317 my %valid = map { $_ => 1 } @values;
319 register_type_constraint(
320 create_enum_type_constraint(
327 sub create_enum_type_constraint {
328 my ( $type_name, $values ) = @_;
330 Moose::Meta::TypeConstraint::Enum->new(
331 name => $type_name || '__ANON__',
336 ## --------------------------------------------------------
337 ## desugaring functions ...
338 ## --------------------------------------------------------
340 sub _create_type_constraint ($$$;$$) {
345 my ($message, $optimized);
347 $message = $_->{message} if exists $_->{message};
348 $optimized = $_->{optimized} if exists $_->{optimized};
351 my $pkg_defined_in = scalar(caller(0));
354 my $type = $REGISTRY->get_type_constraint($name);
356 ($type->_package_defined_in eq $pkg_defined_in)
357 || confess ("The type constraint '$name' has already been created in "
358 . $type->_package_defined_in . " and cannot be created again in "
363 my $class = "Moose::Meta::TypeConstraint";
365 # FIXME should probably not be a special case
366 if ( defined $parent and $parent = find_or_parse_type_constraint($parent) ) {
367 $class = "Moose::Meta::TypeConstraint::Parameterizable"
368 if $parent->isa("Moose::Meta::TypeConstraint::Parameterizable");
371 my $constraint = $class->new(
372 name => $name || '__ANON__',
373 package_defined_in => $pkg_defined_in,
375 ($parent ? (parent => $parent ) : ()),
376 ($check ? (constraint => $check) : ()),
377 ($message ? (message => $message) : ()),
378 ($optimized ? (optimized => $optimized) : ()),
382 # if we have a type constraint union, and no
383 # type check, this means we are just aliasing
384 # the union constraint, which means we need to
385 # handle this differently.
387 if (not(defined $check)
388 && $parent->isa('Moose::Meta::TypeConstraint::Union')
389 && $parent->has_coercion
391 $constraint->coercion(Moose::Meta::TypeCoercion::Union->new(
392 type_constraint => $parent
396 $REGISTRY->add_type_constraint($constraint)
402 sub _install_type_coercions ($$) {
403 my ($type_name, $coercion_map) = @_;
404 my $type = find_type_constraint($type_name);
406 || Moose->throw_error("Cannot find type '$type_name', perhaps you forgot to load it.");
407 if ($type->has_coercion) {
408 $type->coercion->add_type_coercions(@$coercion_map);
411 my $type_coercion = Moose::Meta::TypeCoercion->new(
412 type_coercion_map => $coercion_map,
413 type_constraint => $type
415 $type->coercion($type_coercion);
419 ## --------------------------------------------------------
420 ## type notation parsing ...
421 ## --------------------------------------------------------
424 # All I have to say is mugwump++ cause I know
425 # do not even have enough regexp-fu to be able
426 # to have written this (I can only barely
427 # understand it as it is)
432 my $valid_chars = qr{[\w:]};
433 my $type_atom = qr{ $valid_chars+ };
437 my $type = qr{ $valid_chars+ (?: \[ \s* (??{$any}) \s* \] )? }x;
438 my $type_capture_parts = qr{ ($valid_chars+) (?: \[ \s* ((??{$any})) \s* \] )? }x;
439 my $type_with_parameter = qr{ $valid_chars+ \[ \s* (??{$any}) \s* \] }x;
441 my $op_union = qr{ \s* \| \s* }x;
442 my $union = qr{ $type (?: $op_union $type )+ }x;
444 ## New Stuff for structured types.
446 my $indirection = qr{=>};
447 my $divider_ops = qr{ $comma | $indirection }x;
448 my $structure_divider = qr{\s* $divider_ops \s*}x;
449 my $structure_elements = qr{ ($type $structure_divider*)+ }x;
451 $any = qr{ $type | $union | $structure_elements }x;
453 sub _parse_parameterized_type_constraint {
454 { no warnings 'void'; $any; } # force capture of interpolated lexical
455 my($base, $elements) = ($_[0] =~ m{ $type_capture_parts }x);
456 return ($base,$elements);
459 sub _detect_parameterized_type_constraint {
460 { no warnings 'void'; $any; } # force capture of interpolated lexical
461 $_[0] =~ m{ ^ $type_with_parameter $ }x;
464 sub _parse_type_constraint_union {
465 { no warnings 'void'; $any; } # force capture of interpolated lexical
468 while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) {
471 (pos($given) eq length($given))
472 || Moose->throw_error("'$given' didn't parse (parse-pos="
480 sub _detect_type_constraint_union {
481 { no warnings 'void'; $any; } # force capture of interpolated lexical
482 $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x;
486 ## --------------------------------------------------------
487 # define some basic built-in types
488 ## --------------------------------------------------------
490 type 'Any' => where { 1 }; # meta-type including all
491 type 'Item' => where { 1 }; # base-type
493 subtype 'Undef' => as 'Item' => where { !defined($_) };
494 subtype 'Defined' => as 'Item' => where { defined($_) };
498 => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' };
502 => where { !ref($_) }
503 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Value;
508 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Ref;
513 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Str;
517 => where { Scalar::Util::looks_like_number($_) }
518 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Num;
522 => where { "$_" =~ /^-?[0-9]+$/ }
523 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Int;
525 subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ScalarRef;
526 subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::CodeRef;
527 subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::RegexpRef;
528 subtype 'GlobRef' => as 'Ref' => where { ref($_) eq 'GLOB' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::GlobRef;
531 # scalar filehandles are GLOB refs,
532 # but a GLOB ref is not always a filehandle
535 => where { Scalar::Util::openhandle($_) || ( blessed($_) && $_->isa("IO::Handle") ) }
536 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::FileHandle;
539 # blessed(qr/.../) returns true,.. how odd
542 => where { blessed($_) && blessed($_) ne 'Regexp' }
543 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Object;
547 => where { $_->can('does') }
548 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Role;
550 my $_class_name_checker = sub {
555 => where { Class::MOP::is_class_loaded($_) }
556 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ClassName;
558 ## --------------------------------------------------------
559 # parameterizable types ...
561 $REGISTRY->add_type_constraint(
562 Moose::Meta::TypeConstraint::Parameterizable->new(
564 package_defined_in => __PACKAGE__,
565 parent => find_type_constraint('Ref'),
566 constraint => sub { ref($_) eq 'ARRAY' },
567 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef,
568 constraint_generator => sub {
569 my $type_parameter = shift;
570 my $check = $type_parameter->_compiled_type_constraint;
572 foreach my $x (@$_) {
573 ($check->($x)) || return
580 $REGISTRY->add_type_constraint(
581 Moose::Meta::TypeConstraint::Parameterizable->new(
583 package_defined_in => __PACKAGE__,
584 parent => find_type_constraint('Ref'),
585 constraint => sub { ref($_) eq 'HASH' },
586 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef,
587 constraint_generator => sub {
588 my $type_parameter = shift;
589 my $check = $type_parameter->_compiled_type_constraint;
591 foreach my $x (values %$_) {
592 ($check->($x)) || return
599 $REGISTRY->add_type_constraint(
600 Moose::Meta::TypeConstraint::Parameterizable->new(
602 package_defined_in => __PACKAGE__,
603 parent => find_type_constraint('Item'),
604 constraint => sub { 1 },
605 constraint_generator => sub {
606 my $type_parameter = shift;
607 my $check = $type_parameter->_compiled_type_constraint;
609 return 1 if not(defined($_)) || $check->($_);
616 my @PARAMETERIZABLE_TYPES = map {
617 $REGISTRY->get_type_constraint($_)
618 } qw[ArrayRef HashRef Maybe];
620 sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES }
621 sub add_parameterizable_type {
623 (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable'))
624 || Moose->throw_error("Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type");
625 push @PARAMETERIZABLE_TYPES => $type;
628 ## --------------------------------------------------------
629 # end of built-in types ...
630 ## --------------------------------------------------------
633 my @BUILTINS = list_all_type_constraints();
634 sub list_all_builtin_type_constraints { @BUILTINS }
645 Moose::Util::TypeConstraints - Type constraint system for Moose
649 use Moose::Util::TypeConstraints;
651 type 'Num' => where { Scalar::Util::looks_like_number($_) };
657 subtype 'NaturalLessThanTen'
660 => message { "This number ($_) is not less than ten!" };
666 enum 'RGBColors' => qw(red green blue);
670 This module provides Moose with the ability to create custom type
671 contraints to be used in attribute definition.
673 =head2 Important Caveat
675 This is B<NOT> a type system for Perl 5. These are type constraints,
676 and they are not used by Moose unless you tell it to. No type
677 inference is performed, expression are not typed, etc. etc. etc.
679 This is simply a means of creating small constraint functions which
680 can be used to simplify your own type-checking code, with the added
681 side benefit of making your intentions clearer through self-documentation.
683 =head2 Slightly Less Important Caveat
685 It is B<always> a good idea to quote your type and subtype names.
687 This is to prevent perl from trying to execute the call as an indirect
688 object call. This issue only seems to come up when you have a subtype
689 the same name as a valid class, but when the issue does arise it tends
690 to be quite annoying to debug.
692 So for instance, this:
694 subtype DateTime => as Object => where { $_->isa('DateTime') };
696 will I<Just Work>, while this:
699 subtype DateTime => as Object => where { $_->isa('DateTime') };
701 will fail silently and cause many headaches. The simple way to solve
702 this, as well as future proof your subtypes from classes which have
703 yet to have been created yet, is to simply do this:
706 subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
708 =head2 Default Type Constraints
710 This module also provides a simple hierarchy for Perl 5 types, here is
711 that hierarchy represented visually.
735 B<NOTE:> Any type followed by a type parameter C<[`a]> can be
736 parameterized, this means you can say:
738 ArrayRef[Int] # an array of intergers
739 HashRef[CodeRef] # a hash of str to CODE ref mappings
740 Maybe[Str] # value may be a string, may be undefined
742 B<NOTE:> Unless you parameterize a type, then it is invalid to
743 include the square brackets. I.e. C<ArrayRef[]> will be
744 literally interpreted as a type name.
746 B<NOTE:> The C<Undef> type constraint for the most part works
747 correctly now, but edge cases may still exist, please use it
750 B<NOTE:> The C<ClassName> type constraint does a complex package
751 existence check. This means that your class B<must> be loaded for
752 this type constraint to pass. I know this is not ideal for all,
753 but it is a saner restriction than most others.
755 =head2 Type Constraint Naming
757 Since the types created by this module are global, it is suggested
758 that you namespace your types just as you would namespace your
759 modules. So instead of creating a I<Color> type for your B<My::Graphics>
760 module, you would call the type I<My::Graphics::Color> instead.
762 =head2 Use with Other Constraint Modules
764 This module should play fairly nicely with other constraint
765 modules with only some slight tweaking. The C<where> clause
766 in types is expected to be a C<CODE> reference which checks
767 it's first argument and returns a boolean. Since most constraint
768 modules work in a similar way, it should be simple to adapt
769 them to work with Moose.
771 For instance, this is how you could use it with
772 L<Declare::Constraints::Simple> to declare a completely new type.
774 type 'HashOfArrayOfObjects'
777 -values => IsArrayRef( IsObject ));
779 For more examples see the F<t/200_examples/204_example_w_DCS.t>
782 Here is an example of using L<Test::Deep> and it's non-test
783 related C<eq_deeply> function.
785 type 'ArrayOfHashOfBarsAndRandomNumbers'
788 array_each(subhashof({
790 random_number => ignore()
794 For a complete example see the
795 F<t/200_examples/205_example_w_TestDeep.t> test file.
799 =head2 Type Constraint Constructors
801 The following functions are used to create type constraints.
802 They will then register the type constraints in a global store
803 where Moose can get to them if it needs to.
805 See the L<SYNOPSIS> for an example of how to use these.
809 =item B<type ($name, $where_clause)>
811 This creates a base type, which has no parent.
813 =item B<subtype ($name, $parent, $where_clause, ?$message)>
815 This creates a named subtype.
817 =item B<subtype ($parent, $where_clause, ?$message)>
819 This creates an unnamed subtype and will return the type
820 constraint meta-object, which will be an instance of
821 L<Moose::Meta::TypeConstraint>.
823 =item B<class_type ($class, ?$options)>
825 Creates a type constraint with the name C<$class> and the metaclass
826 L<Moose::Meta::TypeConstraint::Class>.
828 =item B<role_type ($role, ?$options)>
830 Creates a type constraint with the name C<$role> and the metaclass
831 L<Moose::Meta::TypeConstraint::Role>.
833 =item B<enum ($name, @values)>
835 This will create a basic subtype for a given set of strings.
836 The resulting constraint will be a subtype of C<Str> and
837 will match any of the items in C<@values>. It is case sensitive.
838 See the L<SYNOPSIS> for a simple example.
840 B<NOTE:> This is not a true proper enum type, it is simple
841 a convient constraint builder.
843 =item B<enum (\@values)>
845 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
846 this will create an unnamed enum. This can then be used in an attribute
849 has 'sort_order' => (
851 isa => enum([qw[ ascending descending ]]),
856 This is just sugar for the type constraint construction syntax.
860 This is just sugar for the type constraint construction syntax.
862 Takes a block/code ref as an argument. When the type constraint is
863 tested, the supplied code is run with the value to be tested in
864 $_. This block should return true or false to indicate whether or not
865 the constraint check passed.
869 This is just sugar for the type constraint construction syntax.
871 Takes a block/code ref as an argument. When the type constraint fails,
872 then the code block is run (with the value provided in $_). This code
873 ref should return a string, which will be used in the text of the
878 This can be used to define a "hand optimized" version of your
879 type constraint which can be used to avoid traversing a subtype
880 constraint heirarchy.
882 B<NOTE:> You should only use this if you know what you are doing,
883 all the built in types use this, so your subtypes (assuming they
884 are shallow) will not likely need to use this.
888 =head2 Type Coercion Constructors
890 Type constraints can also contain type coercions as well. If you
891 ask your accessor to coerce, then Moose will run the type-coercion
892 code first, followed by the type constraint check. This feature
893 should be used carefully as it is very powerful and could easily
894 take off a limb if you are not careful.
896 See the L<SYNOPSIS> for an example of how to use these.
904 This is just sugar for the type coercion construction syntax.
908 This is just sugar for the type coercion construction syntax.
912 =head2 Type Constraint Construction & Locating
916 =item B<normalize_type_constraint_name ($type_constraint_name)>
918 Given a string that is expected to match a type constraint, will normalize the
919 string so that extra whitespace and newlines are removed.
921 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
923 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
924 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
926 =item B<create_parameterized_type_constraint ($type_name)>
928 Given a C<$type_name> in the form of:
930 BaseType[ContainerType]
932 this will extract the base type and container type and build an instance of
933 L<Moose::Meta::TypeConstraint::Parameterized> for it.
935 =item B<create_class_type_constraint ($class, ?$options)>
937 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
938 object for that class name.
940 =item B<create_role_type_constraint ($role, ?$options)>
942 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
943 object for that role name.
945 =item B<create_enum_type_constraint ($name, $values)>
947 =item B<find_or_parse_type_constraint ($type_name)>
949 This will attempt to find or create a type constraint given the a C<$type_name>.
950 If it cannot find it in the registry, it will see if it should be a union or
951 container type an create one if appropriate
953 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
955 This function will first call C<find_or_parse_type_constraint> with the type name.
957 If no type is found or created, but C<$options_for_anon_type> are provided, it
958 will create the corresponding type.
960 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
961 and are now superseded by C<find_or_create_isa_type_constraint> and
962 C<find_or_create_does_type_constraint>.
964 =item B<find_or_create_isa_type_constraint ($type_name)>
966 =item B<find_or_create_does_type_constraint ($type_name)>
968 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
969 no appropriate constraint is found will create a new anonymous one.
971 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
972 variant will use C<create_role_type_constraint>.
974 =item B<find_type_constraint ($type_name)>
976 This function can be used to locate a specific type constraint
977 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
978 derivative. What you do with it from there is up to you :)
980 =item B<register_type_constraint ($type_object)>
982 This function will register a named type constraint with the type registry.
984 =item B<get_type_constraint_registry>
986 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
987 keeps track of all type constraints.
989 =item B<list_all_type_constraints>
991 This will return a list of type constraint names, you can then
992 fetch them using C<find_type_constraint ($type_name)> if you
995 =item B<list_all_builtin_type_constraints>
997 This will return a list of builtin type constraints, meaning,
998 those which are defined in this module. See the section
999 labeled L<Default Type Constraints> for a complete list.
1001 =item B<export_type_constraints_as_functions>
1003 This will export all the current type constraints as functions
1004 into the caller's namespace. Right now, this is mostly used for
1005 testing, but it might prove useful to others.
1007 =item B<get_all_parameterizable_types>
1009 This returns all the parameterizable types that have been registered.
1011 =item B<add_parameterizable_type ($type)>
1013 Adds C<$type> to the list of parameterizable types
1017 =head1 Error Management
1023 If the caller is a Moose metaclass, use its L<Moose::Meta::Class/throw_error>
1024 routine, otherwise use L<Carp/confess>.
1028 =head2 Namespace Management
1034 This will remove all the type constraint keywords from the
1035 calling class namespace.
1041 All complex software has bugs lurking in it, and this module is no
1042 exception. If you find a bug please either email me, or add the bug
1047 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1049 =head1 COPYRIGHT AND LICENSE
1051 Copyright 2006-2008 by Infinity Interactive, Inc.
1053 L<http://www.iinteractive.com>
1055 This library is free software; you can redistribute it and/or modify
1056 it under the same terms as Perl itself.