2 package Moose::Util::TypeConstraints;
8 use Scalar::Util 'blessed';
11 our $VERSION = '0.57';
12 $VERSION = eval $VERSION;
13 our $AUTHORITY = 'cpan:STEVAN';
15 ## --------------------------------------------------------
16 # Prototyped subs must be predeclared because we have a
17 # circular dependency with Moose::Meta::Attribute et. al.
18 # so in case of us being use'd first the predeclaration
19 # ensures the prototypes are in scope when consumers are
22 # creation and location
23 sub find_type_constraint ($);
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 || Moose->throw_error("You must pass in at least 2 type names to make a union");
108 my @type_constraints = sort {$a->name cmp $b->name} map {
109 find_or_parse_type_constraint($_) ||
110 Moose->throw_error("Could not locate type constraint ($_) for the union");
111 } @type_constraint_names;
113 return Moose::Meta::TypeConstraint::Union->new(
114 type_constraints => \@type_constraints
118 sub create_parameterized_type_constraint ($) {
119 my $type_constraint_name = shift;
120 my ($base_type, $type_parameter_str) = _parse_parameterized_type_constraint($type_constraint_name);
122 (defined $base_type && defined $type_parameter_str)
123 || Moose->throw_error("Could not parse type name ($type_constraint_name) correctly");
125 if ($REGISTRY->has_type_constraint($base_type)) {
126 my $base_type_tc = $REGISTRY->get_type_constraint($base_type);
127 return _create_parameterized_type_constraint(
132 Moose->throw_error("Could not locate the base type ($base_type)");
136 sub _create_parameterized_type_constraint {
137 my ($base_type_tc, $type_parameter_str) = @_;
138 if($base_type_tc->can('parameterize')) {
139 my @type_parameters_tc = $base_type_tc->parse_parameter_str($type_parameter_str);
140 return $base_type_tc->parameterize( @type_parameters_tc);
142 return Moose::Meta::TypeConstraint::Parameterized->new(
143 name => $base_type_tc->name .'['. $type_parameter_str .']',
144 parent => $base_type_tc,
145 type_parameter => find_or_create_isa_type_constraint($type_parameter_str),
150 #should we also support optimized checks?
151 sub create_class_type_constraint ($;$) {
152 my ( $class, $options ) = @_;
154 # too early for this check
155 #find_type_constraint("ClassName")->check($class)
156 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
164 $options{name} ||= "__ANON__";
166 Moose::Meta::TypeConstraint::Class->new( %options );
169 sub create_role_type_constraint ($;$) {
170 my ( $role, $options ) = @_;
172 # too early for this check
173 #find_type_constraint("ClassName")->check($class)
174 # || Moose->throw_error("Can't create a class type constraint because '$class' is not a class name");
182 $options{name} ||= "__ANON__";
184 Moose::Meta::TypeConstraint::Role->new( %options );
188 sub find_or_create_type_constraint ($;$) {
189 my ( $type_constraint_name, $options_for_anon_type ) = @_;
191 if ( my $constraint = find_or_parse_type_constraint($type_constraint_name) ) {
194 elsif ( defined $options_for_anon_type ) {
196 # if there is no $options_for_anon_type
197 # specified, then we assume they don't
198 # want to create one, and return nothing.
200 # otherwise assume that we should create
201 # an ANON type with the $options_for_anon_type
202 # options which can be passed in. It should
203 # be noted that these don't get registered
204 # so we need to return it.
206 return Moose::Meta::TypeConstraint->new(
208 %{$options_for_anon_type}
215 sub find_or_create_isa_type_constraint ($) {
216 my $type_constraint_name = shift;
217 find_or_parse_type_constraint($type_constraint_name) || create_class_type_constraint($type_constraint_name)
220 sub find_or_create_does_type_constraint ($) {
221 my $type_constraint_name = shift;
222 find_or_parse_type_constraint($type_constraint_name) || create_role_type_constraint($type_constraint_name)
225 sub find_or_parse_type_constraint ($) {
226 my $type_constraint_name = normalize_type_constraint_name(shift);
229 if ($constraint = find_type_constraint($type_constraint_name)) {
231 } elsif (_detect_type_constraint_union($type_constraint_name)) {
232 $constraint = create_type_constraint_union($type_constraint_name);
233 } elsif (_detect_parameterized_type_constraint($type_constraint_name)) {
234 $constraint = create_parameterized_type_constraint($type_constraint_name);
239 $REGISTRY->add_type_constraint($constraint);
243 sub normalize_type_constraint_name {
244 my $type_constraint_name = shift @_;
245 $type_constraint_name =~s/\s//g;
246 return $type_constraint_name;
249 ## --------------------------------------------------------
250 ## exported functions ...
251 ## --------------------------------------------------------
253 sub find_type_constraint ($) {
256 if ( blessed $type and $type->isa("Moose::Meta::TypeConstraint") ) {
260 return unless $REGISTRY->has_type_constraint($type);
261 return $REGISTRY->get_type_constraint($type);
265 sub register_type_constraint ($) {
266 my $constraint = shift;
267 Moose->throw_error("can't register an unnamed type constraint") unless defined $constraint->name;
268 $REGISTRY->add_type_constraint($constraint);
275 splice(@_, 1, 0, undef);
276 goto &_create_type_constraint;
279 sub subtype ($$;$$$) {
281 # this adds an undef for the name
282 # if this is an anon-subtype:
283 # subtype(Num => where { $_ % 2 == 0 }) # anon 'even' subtype
284 # but if the last arg is not a code
285 # ref then it is a subtype alias:
286 # subtype(MyNumbers => as Num); # now MyNumbers is the same as Num
287 # ... yeah I know it's ugly code
289 unshift @_ => undef if scalar @_ <= 2 && ('CODE' eq ref($_[1]));
290 goto &_create_type_constraint;
293 sub class_type ($;$) {
294 register_type_constraint(
295 create_class_type_constraint(
297 ( defined($_[1]) ? $_[1] : () ),
302 sub role_type ($;$) {
303 register_type_constraint(
304 create_role_type_constraint(
306 ( defined($_[1]) ? $_[1] : () ),
312 my ($type_name, @coercion_map) = @_;
313 _install_type_coercions($type_name, \@coercion_map);
317 sub from ($) { $_[0] }
318 sub where (&) { $_[0] }
319 sub via (&) { $_[0] }
321 sub message (&) { +{ message => $_[0] } }
322 sub optimize_as (&) { +{ optimized => $_[0] } }
325 my ($type_name, @values) = @_;
327 # if only an array-ref is passed then
328 # you get an anon-enum
330 if (ref $type_name eq 'ARRAY' && !@values) {
331 @values = @$type_name;
334 (scalar @values >= 2)
335 || Moose->throw_error("You must have at least two values to enumerate through");
336 my %valid = map { $_ => 1 } @values;
338 register_type_constraint(
339 create_enum_type_constraint(
346 sub create_enum_type_constraint ($$) {
347 my ( $type_name, $values ) = @_;
349 Moose::Meta::TypeConstraint::Enum->new(
350 name => $type_name || '__ANON__',
355 ## --------------------------------------------------------
356 ## desugaring functions ...
357 ## --------------------------------------------------------
359 sub _create_type_constraint ($$$;$$) {
364 my ($message, $optimized);
366 $message = $_->{message} if exists $_->{message};
367 $optimized = $_->{optimized} if exists $_->{optimized};
370 my $pkg_defined_in = scalar(caller(0));
373 my $type = $REGISTRY->get_type_constraint($name);
375 ($type->_package_defined_in eq $pkg_defined_in)
376 || confess ("The type constraint '$name' has already been created in "
377 . $type->_package_defined_in . " and cannot be created again in "
382 my $class = "Moose::Meta::TypeConstraint";
384 # FIXME should probably not be a special case
385 if ( defined $parent and $parent = find_or_parse_type_constraint($parent) ) {
386 $class = "Moose::Meta::TypeConstraint::Parameterizable"
387 if $parent->isa("Moose::Meta::TypeConstraint::Parameterizable");
390 my $constraint = $class->new(
391 name => $name || '__ANON__',
392 package_defined_in => $pkg_defined_in,
394 ($parent ? (parent => $parent ) : ()),
395 ($check ? (constraint => $check) : ()),
396 ($message ? (message => $message) : ()),
397 ($optimized ? (optimized => $optimized) : ()),
401 # if we have a type constraint union, and no
402 # type check, this means we are just aliasing
403 # the union constraint, which means we need to
404 # handle this differently.
406 if (not(defined $check)
407 && $parent->isa('Moose::Meta::TypeConstraint::Union')
408 && $parent->has_coercion
410 $constraint->coercion(Moose::Meta::TypeCoercion::Union->new(
411 type_constraint => $parent
415 $REGISTRY->add_type_constraint($constraint)
421 sub _install_type_coercions ($$) {
422 my ($type_name, $coercion_map) = @_;
423 my $type = find_type_constraint($type_name);
425 || Moose->throw_error("Cannot find type '$type_name', perhaps you forgot to load it.");
426 if ($type->has_coercion) {
427 $type->coercion->add_type_coercions(@$coercion_map);
430 my $type_coercion = Moose::Meta::TypeCoercion->new(
431 type_coercion_map => $coercion_map,
432 type_constraint => $type
434 $type->coercion($type_coercion);
438 ## --------------------------------------------------------
439 ## type notation parsing ...
440 ## --------------------------------------------------------
443 # All I have to say is mugwump++ cause I know
444 # do not even have enough regexp-fu to be able
445 # to have written this (I can only barely
446 # understand it as it is)
451 my $valid_chars = qr{[\w:]};
452 my $type_atom = qr{ $valid_chars+ };
456 my $type = qr{ $valid_chars+ (?: \[ \s* (??{$any}) \s* \] )? }x;
457 my $type_capture_parts = qr{ ($valid_chars+) (?: \[ \s* ((??{$any})) \s* \] )? }x;
458 my $type_with_parameter = qr{ $valid_chars+ \[ \s* (??{$any}) \s* \] }x;
460 my $op_union = qr{ \s* \| \s* }x;
461 my $union = qr{ $type (?: $op_union $type )+ }x;
463 ## New Stuff for structured types.
465 my $indirection = qr{=>};
466 my $divider_ops = qr{ $comma | $indirection }x;
467 my $structure_divider = qr{\s* $divider_ops \s*}x;
468 my $structure_elements = qr{ ($type $structure_divider*)+ }x;
470 $any = qr{ $type | $union | $structure_elements }x;
472 sub _parse_parameterized_type_constraint {
473 { no warnings 'void'; $any; } # force capture of interpolated lexical
474 my($base, $elements) = ($_[0] =~ m{ $type_capture_parts }x);
475 return ($base,$elements);
478 sub _detect_parameterized_type_constraint {
479 { no warnings 'void'; $any; } # force capture of interpolated lexical
480 $_[0] =~ m{ ^ $type_with_parameter $ }x;
483 sub _parse_type_constraint_union {
484 { no warnings 'void'; $any; } # force capture of interpolated lexical
487 while ( $given =~ m{ \G (?: $op_union )? ($type) }gcx ) {
490 (pos($given) eq length($given))
491 || Moose->throw_error("'$given' didn't parse (parse-pos="
499 sub _detect_type_constraint_union {
500 { no warnings 'void'; $any; } # force capture of interpolated lexical
501 $_[0] =~ m{^ $type $op_union $type ( $op_union .* )? $}x;
505 ## --------------------------------------------------------
506 # define some basic built-in types
507 ## --------------------------------------------------------
509 type 'Any' => where { 1 }; # meta-type including all
510 type 'Item' => where { 1 }; # base-type
512 subtype 'Undef' => as 'Item' => where { !defined($_) };
513 subtype 'Defined' => as 'Item' => where { defined($_) };
517 => where { !defined($_) || $_ eq "" || "$_" eq '1' || "$_" eq '0' };
521 => where { !ref($_) }
522 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Value;
527 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Ref;
532 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Str;
536 => where { Scalar::Util::looks_like_number($_) }
537 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Num;
541 => where { "$_" =~ /^-?[0-9]+$/ }
542 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Int;
544 subtype 'ScalarRef' => as 'Ref' => where { ref($_) eq 'SCALAR' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ScalarRef;
545 subtype 'CodeRef' => as 'Ref' => where { ref($_) eq 'CODE' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::CodeRef;
546 subtype 'RegexpRef' => as 'Ref' => where { ref($_) eq 'Regexp' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::RegexpRef;
547 subtype 'GlobRef' => as 'Ref' => where { ref($_) eq 'GLOB' } => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::GlobRef;
550 # scalar filehandles are GLOB refs,
551 # but a GLOB ref is not always a filehandle
554 => where { Scalar::Util::openhandle($_) || ( blessed($_) && $_->isa("IO::Handle") ) }
555 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::FileHandle;
558 # blessed(qr/.../) returns true,.. how odd
561 => where { blessed($_) && blessed($_) ne 'Regexp' }
562 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Object;
566 => where { $_->can('does') }
567 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::Role;
569 my $_class_name_checker = sub {
574 => where { Class::MOP::is_class_loaded($_) }
575 => optimize_as \&Moose::Util::TypeConstraints::OptimizedConstraints::ClassName;
577 ## --------------------------------------------------------
578 # parameterizable types ...
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 'ARRAY' },
586 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::ArrayRef,
587 constraint_generator => sub {
588 my $type_parameter = shift;
589 my $check = $type_parameter->_compiled_type_constraint;
591 foreach my $x (@$_) {
592 ($check->($x)) || return
599 $REGISTRY->add_type_constraint(
600 Moose::Meta::TypeConstraint::Parameterizable->new(
602 package_defined_in => __PACKAGE__,
603 parent => find_type_constraint('Ref'),
604 constraint => sub { ref($_) eq 'HASH' },
605 optimized => \&Moose::Util::TypeConstraints::OptimizedConstraints::HashRef,
606 constraint_generator => sub {
607 my $type_parameter = shift;
608 my $check = $type_parameter->_compiled_type_constraint;
610 foreach my $x (values %$_) {
611 ($check->($x)) || return
618 $REGISTRY->add_type_constraint(
619 Moose::Meta::TypeConstraint::Parameterizable->new(
621 package_defined_in => __PACKAGE__,
622 parent => find_type_constraint('Item'),
623 constraint => sub { 1 },
624 constraint_generator => sub {
625 my $type_parameter = shift;
626 my $check = $type_parameter->_compiled_type_constraint;
628 return 1 if not(defined($_)) || $check->($_);
635 my @PARAMETERIZABLE_TYPES = map {
636 $REGISTRY->get_type_constraint($_)
637 } qw[ArrayRef HashRef Maybe];
639 sub get_all_parameterizable_types { @PARAMETERIZABLE_TYPES }
640 sub add_parameterizable_type {
642 (blessed $type && $type->isa('Moose::Meta::TypeConstraint::Parameterizable'))
643 || Moose->throw_error("Type must be a Moose::Meta::TypeConstraint::Parameterizable not $type");
644 push @PARAMETERIZABLE_TYPES => $type;
647 ## --------------------------------------------------------
648 # end of built-in types ...
649 ## --------------------------------------------------------
652 my @BUILTINS = list_all_type_constraints();
653 sub list_all_builtin_type_constraints { @BUILTINS }
664 Moose::Util::TypeConstraints - Type constraint system for Moose
668 use Moose::Util::TypeConstraints;
670 type 'Num' => where { Scalar::Util::looks_like_number($_) };
676 subtype 'NaturalLessThanTen'
679 => message { "This number ($_) is not less than ten!" };
685 enum 'RGBColors' => qw(red green blue);
689 This module provides Moose with the ability to create custom type
690 contraints to be used in attribute definition.
692 =head2 Important Caveat
694 This is B<NOT> a type system for Perl 5. These are type constraints,
695 and they are not used by Moose unless you tell it to. No type
696 inference is performed, expression are not typed, etc. etc. etc.
698 This is simply a means of creating small constraint functions which
699 can be used to simplify your own type-checking code, with the added
700 side benefit of making your intentions clearer through self-documentation.
702 =head2 Slightly Less Important Caveat
704 It is B<always> a good idea to quote your type and subtype names.
706 This is to prevent perl from trying to execute the call as an indirect
707 object call. This issue only seems to come up when you have a subtype
708 the same name as a valid class, but when the issue does arise it tends
709 to be quite annoying to debug.
711 So for instance, this:
713 subtype DateTime => as Object => where { $_->isa('DateTime') };
715 will I<Just Work>, while this:
718 subtype DateTime => as Object => where { $_->isa('DateTime') };
720 will fail silently and cause many headaches. The simple way to solve
721 this, as well as future proof your subtypes from classes which have
722 yet to have been created yet, is to simply do this:
725 subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
727 =head2 Default Type Constraints
729 This module also provides a simple hierarchy for Perl 5 types, here is
730 that hierarchy represented visually.
754 B<NOTE:> Any type followed by a type parameter C<[`a]> can be
755 parameterized, this means you can say:
757 ArrayRef[Int] # an array of intergers
758 HashRef[CodeRef] # a hash of str to CODE ref mappings
759 Maybe[Str] # value may be a string, may be undefined
761 B<NOTE:> Unless you parameterize a type, then it is invalid to
762 include the square brackets. I.e. C<ArrayRef[]> will be
763 literally interpreted as a type name.
765 B<NOTE:> The C<Undef> type constraint for the most part works
766 correctly now, but edge cases may still exist, please use it
769 B<NOTE:> The C<ClassName> type constraint does a complex package
770 existence check. This means that your class B<must> be loaded for
771 this type constraint to pass. I know this is not ideal for all,
772 but it is a saner restriction than most others.
774 =head2 Type Constraint Naming
776 Since the types created by this module are global, it is suggested
777 that you namespace your types just as you would namespace your
778 modules. So instead of creating a I<Color> type for your B<My::Graphics>
779 module, you would call the type I<My::Graphics::Color> instead.
781 =head2 Use with Other Constraint Modules
783 This module should play fairly nicely with other constraint
784 modules with only some slight tweaking. The C<where> clause
785 in types is expected to be a C<CODE> reference which checks
786 it's first argument and returns a boolean. Since most constraint
787 modules work in a similar way, it should be simple to adapt
788 them to work with Moose.
790 For instance, this is how you could use it with
791 L<Declare::Constraints::Simple> to declare a completely new type.
793 type 'HashOfArrayOfObjects'
796 -values => IsArrayRef( IsObject ));
798 For more examples see the F<t/200_examples/204_example_w_DCS.t>
801 Here is an example of using L<Test::Deep> and it's non-test
802 related C<eq_deeply> function.
804 type 'ArrayOfHashOfBarsAndRandomNumbers'
807 array_each(subhashof({
809 random_number => ignore()
813 For a complete example see the
814 F<t/200_examples/205_example_w_TestDeep.t> test file.
818 =head2 Type Constraint Constructors
820 The following functions are used to create type constraints.
821 They will then register the type constraints in a global store
822 where Moose can get to them if it needs to.
824 See the L<SYNOPSIS> for an example of how to use these.
828 =item B<type ($name, $where_clause)>
830 This creates a base type, which has no parent.
832 =item B<subtype ($name, $parent, $where_clause, ?$message)>
834 This creates a named subtype.
836 =item B<subtype ($parent, $where_clause, ?$message)>
838 This creates an unnamed subtype and will return the type
839 constraint meta-object, which will be an instance of
840 L<Moose::Meta::TypeConstraint>.
842 =item B<class_type ($class, ?$options)>
844 Creates a type constraint with the name C<$class> and the metaclass
845 L<Moose::Meta::TypeConstraint::Class>.
847 =item B<role_type ($role, ?$options)>
849 Creates a type constraint with the name C<$role> and the metaclass
850 L<Moose::Meta::TypeConstraint::Role>.
852 =item B<enum ($name, @values)>
854 This will create a basic subtype for a given set of strings.
855 The resulting constraint will be a subtype of C<Str> and
856 will match any of the items in C<@values>. It is case sensitive.
857 See the L<SYNOPSIS> for a simple example.
859 B<NOTE:> This is not a true proper enum type, it is simple
860 a convient constraint builder.
862 =item B<enum (\@values)>
864 If passed an ARRAY reference instead of the C<$name>, C<@values> pair,
865 this will create an unnamed enum. This can then be used in an attribute
868 has 'sort_order' => (
870 isa => enum([qw[ ascending descending ]]),
875 This is just sugar for the type constraint construction syntax.
879 This is just sugar for the type constraint construction syntax.
881 Takes a block/code ref as an argument. When the type constraint is
882 tested, the supplied code is run with the value to be tested in
883 $_. This block should return true or false to indicate whether or not
884 the constraint check passed.
888 This is just sugar for the type constraint construction syntax.
890 Takes a block/code ref as an argument. When the type constraint fails,
891 then the code block is run (with the value provided in $_). This code
892 ref should return a string, which will be used in the text of the
897 This can be used to define a "hand optimized" version of your
898 type constraint which can be used to avoid traversing a subtype
899 constraint heirarchy.
901 B<NOTE:> You should only use this if you know what you are doing,
902 all the built in types use this, so your subtypes (assuming they
903 are shallow) will not likely need to use this.
907 =head2 Type Coercion Constructors
909 Type constraints can also contain type coercions as well. If you
910 ask your accessor to coerce, then Moose will run the type-coercion
911 code first, followed by the type constraint check. This feature
912 should be used carefully as it is very powerful and could easily
913 take off a limb if you are not careful.
915 See the L<SYNOPSIS> for an example of how to use these.
923 This is just sugar for the type coercion construction syntax.
927 This is just sugar for the type coercion construction syntax.
931 =head2 Type Constraint Construction & Locating
935 =item B<normalize_type_constraint_name ($type_constraint_name)>
937 Given a string that is expected to match a type constraint, will normalize the
938 string so that extra whitespace and newlines are removed.
940 =item B<create_type_constraint_union ($pipe_seperated_types | @type_constraint_names)>
942 Given string with C<$pipe_seperated_types> or a list of C<@type_constraint_names>,
943 this will return a L<Moose::Meta::TypeConstraint::Union> instance.
945 =item B<create_parameterized_type_constraint ($type_name)>
947 Given a C<$type_name> in the form of:
949 BaseType[ContainerType]
951 this will extract the base type and container type and build an instance of
952 L<Moose::Meta::TypeConstraint::Parameterized> for it.
954 =item B<create_class_type_constraint ($class, ?$options)>
956 Given a class name it will create a new L<Moose::Meta::TypeConstraint::Class>
957 object for that class name.
959 =item B<create_role_type_constraint ($role, ?$options)>
961 Given a role name it will create a new L<Moose::Meta::TypeConstraint::Role>
962 object for that role name.
964 =item B<create_enum_type_constraint ($name, $values)>
966 =item B<find_or_parse_type_constraint ($type_name)>
968 This will attempt to find or create a type constraint given the a C<$type_name>.
969 If it cannot find it in the registry, it will see if it should be a union or
970 container type an create one if appropriate
972 =item B<find_or_create_type_constraint ($type_name, ?$options_for_anon_type)>
974 This function will first call C<find_or_parse_type_constraint> with the type name.
976 If no type is found or created, but C<$options_for_anon_type> are provided, it
977 will create the corresponding type.
979 This was used by the C<does> and C<isa> parameters to L<Moose::Meta::Attribute>
980 and are now superseded by C<find_or_create_isa_type_constraint> and
981 C<find_or_create_does_type_constraint>.
983 =item B<find_or_create_isa_type_constraint ($type_name)>
985 =item B<find_or_create_does_type_constraint ($type_name)>
987 Attempts to parse the type name using L<find_or_parse_type_constraint> and if
988 no appropriate constraint is found will create a new anonymous one.
990 The C<isa> variant will use C<create_class_type_constraint> and the C<does>
991 variant will use C<create_role_type_constraint>.
993 =item B<find_type_constraint ($type_name)>
995 This function can be used to locate a specific type constraint
996 meta-object, of the class L<Moose::Meta::TypeConstraint> or a
997 derivative. What you do with it from there is up to you :)
999 =item B<register_type_constraint ($type_object)>
1001 This function will register a named type constraint with the type registry.
1003 =item B<get_type_constraint_registry>
1005 Fetch the L<Moose::Meta::TypeConstraint::Registry> object which
1006 keeps track of all type constraints.
1008 =item B<list_all_type_constraints>
1010 This will return a list of type constraint names, you can then
1011 fetch them using C<find_type_constraint ($type_name)> if you
1014 =item B<list_all_builtin_type_constraints>
1016 This will return a list of builtin type constraints, meaning,
1017 those which are defined in this module. See the section
1018 labeled L<Default Type Constraints> for a complete list.
1020 =item B<export_type_constraints_as_functions>
1022 This will export all the current type constraints as functions
1023 into the caller's namespace. Right now, this is mostly used for
1024 testing, but it might prove useful to others.
1026 =item B<get_all_parameterizable_types>
1028 This returns all the parameterizable types that have been registered.
1030 =item B<add_parameterizable_type ($type)>
1032 Adds C<$type> to the list of parameterizable types
1036 =head1 Error Management
1042 If the caller is a Moose metaclass, use its L<Moose::Meta::Class/throw_error>
1043 routine, otherwise use L<Carp/confess>.
1047 =head2 Namespace Management
1053 This will remove all the type constraint keywords from the
1054 calling class namespace.
1060 All complex software has bugs lurking in it, and this module is no
1061 exception. If you find a bug please either email me, or add the bug
1066 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1068 =head1 COPYRIGHT AND LICENSE
1070 Copyright 2006-2008 by Infinity Interactive, Inc.
1072 L<http://www.iinteractive.com>
1074 This library is free software; you can redistribute it and/or modify
1075 it under the same terms as Perl itself.