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 $registry->lookup("Str")
Functions¶
- "t"
- This class can export a function "t" which acts like
""Type::Registry"->for_class($importing_class)".
BUGS¶
Please report any bugs to
<
http://rt.cpan.org/Dist/Display.html?Queue=Type-Tiny>.
SEE ALSO¶
Type::Library.
AUTHOR¶
Toby Inkster <tobyink@cpan.org>.
COPYRIGHT AND LICENCE¶
This software is copyright (c) 2013-2014 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.
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.