Type::Library (3)

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NAME

Type::Library - tiny, yet Moo(se)-compatible type libraries

SYNOPSIS

   package Types::Mine {
      use Scalar::Util qw(looks_like_number);
      use Type::Library -base;
      use Type::Tiny;
      
      my $NUM = "Type::Tiny"->new(
         name       => "Number",
         constraint => sub { looks_like_number($_) },
         message    => sub { "$_ ain't a number" },
      );
      
      __PACKAGE__->meta->add_type($NUM);
      
      __PACKAGE__->meta->make_immutable;
   }
      
   package Ermintrude {
      use Moo;
      use Types::Mine qw(Number);
      has favourite_number => (is => "ro", isa => Number);
   }
   
   package Bullwinkle {
      use Moose;
      use Types::Mine qw(Number);
      has favourite_number => (is => "ro", isa => Number);
   }
   
   package Maisy {
      use Mouse;
      use Types::Mine qw(Number);
      has favourite_number => (is => "ro", isa => Number);
   }

STATUS

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

DESCRIPTION

Type::Library is a tiny class for creating MooseX::Types-like type libraries which are compatible with Moo, Moose and Mouse.

If you're reading this because you want to create a type library, then you're probably better off reading Type::Tiny::Manual::Libraries.

Methods

A type library is a singleton class. Use the "meta" method to get a blessed object which other methods can get called on. For example:

   Types::Mine->meta->add_type($foo);

add_type($type) or add_type(%opts)

Add a type to the library. If %opts is given, then this method calls "Type::Tiny->new(%opts)" first, and adds the resultant type.

Adding a type named ``Foo'' to the library will automatically define four functions in the library's namespace:

Foo

Returns the Type::Tiny object.

is_Foo($value)

Returns true iff $value passes the type constraint.

assert_Foo($value)

Returns $value iff $value passes the type constraint. Dies otherwise.

to_Foo($value)

Coerces the value to the type.

get_type($name)

Gets the "Type::Tiny" object corresponding to the name.

has_type($name)

Boolean; returns true if the type exists in the library.

type_names

List all types defined by the library.

add_coercion($c) or add_coercion(%opts)

Add a standalone coercion to the library. If %opts is given, then this method calls "Type::Coercion->new(%opts)" first, and adds the resultant coercion.

Adding a coercion named ``FooFromBar'' to the library will automatically define a function in the library's namespace:

FooFromBar

Returns the Type::Coercion object.

get_coercion($name)

Gets the "Type::Coercion" object corresponding to the name.

has_coercion($name)

Boolean; returns true if the coercion exists in the library.

coercion_names

List all standalone coercions defined by the library.

import(@args)

Type::Library-based libraries are exporters.

make_immutable

A shortcut for calling "$type->coercion->freeze" on every type constraint in the library.

Constants

NICE_PROTOTYPES

If this is true, then Type::Library will give parameterizable type constraints slightly the nicer prototype of "(;$)" instead of the default "(;@)". This allows constructs like:

   ArrayRef[Int] | HashRef[Int]

... to ``just work''.

Export

Type libraries are exporters. For the purposes of the following examples, assume that the "Types::Mine" library defines types "Number" and "String".

   # Exports nothing.
   # 
   use Types::Mine;
   
   # Exports a function "String" which is a constant returning
   # the String type constraint.
   #
   use Types::Mine qw( String );
   
   # Exports both String and Number as above.
   #
   use Types::Mine qw( String Number );
   
   # Same.
   #
   use Types::Mine qw( :types );
   
   # Exports a sub "is_String" so that "is_String($foo)" is equivalent
   # to "String->check($foo)".
   #
   use Types::Mine qw( is_String );
   
   # Exports "is_String" and "is_Number".
   #
   use Types::Mine qw( :is );
   
   # Exports a sub "assert_String" so that "assert_String($foo)" is
   # equivalent to "String->assert_return($foo)".
   #
   use Types::Mine qw( assert_String );
   
   # Exports "assert_String" and "assert_Number".
   #
   use Types::Mine qw( :assert );
   
   # Exports a sub "to_String" so that "to_String($foo)" is equivalent
   # to "String->coerce($foo)".
   #
   use Types::Mine qw( to_String );
   
   # Exports "to_String" and "to_Number".
   #
   use Types::Mine qw( :to );
   
   # Exports "String", "is_String", "assert_String" and "coerce_String".
   #
   use Types::Mine qw( +String );
   
   # Exports everything.
   #
   use Types::Mine qw( :all );

Type libraries automatically inherit from Exporter::Tiny; see the documentation of that module for tips and tricks importing from libraries.

BUGS

Please report any bugs to <rt.cpan.org/Dist/Display.html?Queue=Type-Tiny>.

SEE ALSO

Type::Tiny::Manual.

Type::Tiny, Type::Utils, Types::Standard, Type::Coercion.

Moose::Util::TypeConstraints, Mouse::Util::TypeConstraints.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2013-2014, 2017 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