MooX::Types::MooseLike(3) User Contributed Perl Documentation MooX::Types::MooseLike(3)

MooX::Types::MooseLike - some Moosish types and a type builder

package MyApp::Types;
use MooX::Types::MooseLike;
use base qw(Exporter);
our @EXPORT_OK = ();

# Define some types
my $defs = [{
  name => 'MyType',
  test => sub { predicate($_[0]) },
  message => sub { "$_[0] is not the type we want!" }
},
{
  name => 'VarChar',
  test => sub {
    my ($value, $param) = @_;
    length($value) <= $param;
  },
  message => sub { "$_[0] is too large! It should be less than or equal to $_[1]." }
}];

# Make the types available - this adds them to @EXPORT_OK automatically.
MooX::Types::MooseLike::register_types($defs, __PACKAGE__);

...

# Somewhere in code that uses the type
package MyApp::Foo;
use Moo;
use MyApp::Types qw(MyType VarChar);

has attribute => (
  is  => 'ro',
  isa => MyType,
);

has string => (
  is  => 'ro',
  isa => VarChar[25]
);

This module provides a possibility to build your own set of Moose-like types. These custom types can then be used to describe fields in Moo-based classes.

See MooX::Types::MooseLike::Base for a list of available base types. Its source also provides an example of how to build base types, along with both parameterizable and non-parameterizable.

register_types( types, package, moose_namespace )

Install the given types within the package. This makes the types automatically exportable by adding them to @EXPORT_OK of the package. Types are expected to be an array ref where every type is of the following format:

{
  name            => 'MyType',
  test            => sub { check_the_value_somehow($_[0]) },
  message         => sub { "$_[0] is not the type we want!" },
  subtype_of      => 'SomeParentType',           # Optional
  from            => 'Some::Parent::CoolTypes',  # Optional
  parameterizable => sub { ... },                # Optional
  inflate         => sub { ... },                # Optional
}

A type can be declared with a reference (subtype_of) to some previously declared type. In this case the new type will inherit the behaviour of the referenced type.

The referenced type can come either from the same package or from a third party package:

MooX::Types::MooseLike::register_types([{
  name       => 'GreaterThan10',
  subtype_of => 'Int',
  from       => 'MooX::Types::MooseLike::Base',
  test       => sub { $_[0] > 10 },
  message    => sub { 'not greater than 10' },
}], __PACKAGE__);

MooX::Types::MooseLike::register_types([{
  name       => 'Between10And20',
  subtype_of => 'GreaterThan10',
  from       => __PACKAGE__,
  test       => sub { $_[0] < 20 },
  message    => sub { 'not an integer between 10 and 20' },
}], __PACKAGE__);

MooX::Types::MooseLike::register_types([{
  name       => 'Between10And30',
  subtype_of => GreaterThan10(),
  test       => sub { $_[0] < 30 },
  message    => sub { 'not an integer between 10 and 30' },
}], __PACKAGE__);

exception_message( value, part_of_the_exception_string )

Helper function to be used in a type definition:

{
  ...
  message => sub { return exception_message($_[0], 'a HashRef' },
  ...
}

In the event of <value> mismatching the type constraints it produces the message:

"<value> is not a HashRef!"

inflate_type( coderef )

Inflates the type to a Moose type. Requires Moose.

MooX::Types::MooseLike::Numeric - an example of building subtypes.

MooX::Types::SetObject - an example of building parameterized types.

MooX::Types::MooseLike::Email, MooX::Types::MooseLike::DateTime

Type::Tiny - another implementation of type constraints. Compatible with Moo, Moose and Mouse.

mateu - Mateu X. Hunter (cpan:MATEU) <hunter@missoula.org>

mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>

Mithaldu - Christian Walde (cpan:MITHALDU) <walde.christian@googlemail.com>

Matt Phillips (cpan:MATTP) <mattp@cpan.org>

Arthur Axel fREW Schmidt (cpan:FREW) <frioux@gmail.com>

Toby Inkster (cpan:TOBYINK) <tobyink@cpan.org>

Graham Knop (cpan:HAARG) <haarg@cpan.org>

Dmitry Matrosov (cpan:AMIDOS) <amidos@amidos.ru>

Copyright (c) 2011-2015 the MooX::Types::MooseLike "AUTHOR" and "CONTRIBUTORS" as listed above.

This library is free software and may be distributed under the same terms as perl itself.
2020-06-21 perl v5.32.0