NAME

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

SYNOPSIS

   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

STATUS

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

DESCRIPTION

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

Constructors

"new": Create a new glorified hashref.
"for_class($class)": 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.

Methods

"add_types(@libraries)"

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.

"simple_lookup($name)"

Look up a type in the registry by name.

Returns undef if not found.

"foreign_lookup($name)"

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.)

"lookup($name)"

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.

"make_union(@constraints)", "make_intersection(@constraints)", "make_class_type($class)", "make_role_type($role)"

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.

Functions

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

BUGS

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

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

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

DISCLAIMER OF WARRANTIES

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.