Type::Registry(3) User Contributed Perl Documentation Type::Registry(3)

Type::Registry - a glorified hashref for looking up type constraints

package Foo::Bar;

use Type::Registry;

my $reg = "Type::Registry"->for_me;  # a registry for Foo::Bar

# Register all types from Types::Standard
$reg->add_types(-Standard);

# Register just one type from Types::XSD
$reg->add_types(-XSD => ["NonNegativeInteger"]);

# Register all types from MyApp::Types
$reg->add_types("MyApp::Types");

# Create a type alias
$reg->alias_type("NonNegativeInteger" => "Count");

# Look up a type constraint
my $type = $reg->lookup("ArrayRef[Count]");

$type->check([1, 2, 3.14159]);  # croaks

Alternatively:

package Foo::Bar;

use Type::Registry qw( t );

# Register all types from Types::Standard
t->add_types(-Standard);

# Register just one type from Types::XSD
t->add_types(-XSD => ["NonNegativeInteger"]);

# Register all types from MyApp::Types
t->add_types("MyApp::Types");

# Create a type alias
t->alias_type("NonNegativeInteger" => "Count");

# Look up a type constraint
my $type = t("ArrayRef[Count]");

$type->check([1, 2, 3.14159]);  # croaks

This module is covered by the Type-Tiny stability policy.

A type registry is basically just a hashref mapping type names to type constraint objects.

"new"
Create a new glorified hashref.
Create or return the existing glorified hashref associated with the given class.

Note that any type constraint you have imported from Type::Library-based type libraries will be automatically available in your class' registry.

"for_me"
Create or return the existing glorified hashref associated with the caller.

The libraries list is treated as an "optlist" (a la Data::OptList).

Strings are the names of type libraries; if the first character is a hyphen, it is expanded to the "Types::" prefix. If followed by an arrayref, this is the list of types to import from that library. Otherwise, imports all types from the library.

use Type::Registry qw(t);

t->add_types(-Standard);  # OR: t->add_types("Types::Standard");

t->add_types(
   -TypeTiny => ['HashLike'],
   -Standard => ['HashRef' => { -as => 'RealHash' }],
);

MooseX::Types (and experimentally, MouseX::Types) libraries can also be added this way, but cannot be followed by an arrayref of types to import.

"add_type($type, $name)"
The long-awaited singular form of "add_types". Given a type constraint object, adds it to the registry with a given name. The name may be omitted, in which case "$type->name" is called, and Type::Registry will throw an error if $type is anonymous. If a name is explicitly given, Type::Registry cares not one wit whether the type constraint is anonymous.

This method can even add MooseX::Types and MouseX::Types type constraints; indeed anything that can be handled by Types::TypeTiny's "to_TypeTiny" function. (Bear in mind that to_TypeTiny always results in an anonymous type constraint, so $name will be required.)

"alias_type($oldname, $newname)"
Create an alias for an existing type.
Look up a type in the registry by name.

Returns undef if not found.

Like "simple_lookup", but if the type name contains "::", will attempt to load it from a type library. (And will attempt to load that module.)
Look up by name, with a DSL. 
t->lookup("Int|ArrayRef[Int]")

The DSL can be summed up as:

X               type from this registry
My::Lib::X      type from a type library
~X              complementary type
X | Y           union
X & Y           intersection
X[...]          parameterized type
slurpy X        slurpy type
Foo::Bar::      class type

Croaks if not found.

Convenience methods for creating certain common type constraints.
"AUTOLOAD"
Overloaded to call "lookup". 
$registry->Str;  # like $registry->lookup("Str")
"get_parent", set_parent($reg), "clear_parent", "has_parent"
Advanced stuff. Allows a registry to have a "parent" registry which it inherits type constraints from.

"t"
This class can export a function "t" which acts like ""Type::Registry"->for_class($importing_class)".

Please report any bugs to https://github.com/tobyink/p5-type-tiny/issues.

Type::Library.

Toby Inkster <tobyink@cpan.org>.

This software is copyright (c) 2013-2014, 2017-2023 by Toby Inkster.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

2024-03-13 perl v5.38.2