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Code Editor : MooseLike.pm

package MooX::Types::MooseLike;
use strict;
use warnings FATAL => 'all';
use Exporter 5.57 'import';
our @EXPORT_OK;
push @EXPORT_OK, qw( exception_message inflate_type );
use Module::Runtime qw(require_module);
use Carp qw(confess croak);
use List::Util qw(first);

our $VERSION = '0.29';

sub register_types {
  my ($type_definitions, $into, $moose_namespace) = @_;
  foreach my $type_def (@{$type_definitions}) {
    my $coderefs = make_type($type_def, $moose_namespace);
    install_type($type_def->{name}, $coderefs, $into);
  }
  return;
}

sub install_type {
  my ($type_name, $coderefs, $namespace) = @_;
  my $is_type_name      = 'is_' . $type_name;
  my $type_full_name    = $namespace . '::' . $type_name;
  my $is_type_full_name = $namespace . '::' . $is_type_name;

{
    no strict 'refs';    ## no critic qw(TestingAndDebugging::ProhibitNoStrict)
    *{$type_full_name}    = $coderefs->{type};
    *{$is_type_full_name} = $coderefs->{is_type};
    push @{"${namespace}::EXPORT_OK"}, $type_name, $is_type_name;
  }
  return;
}

sub make_type {
  my ($type_definition, $moose_namespace) = @_;
  my $test = $type_definition->{test};

if (my $subtype_of = $type_definition->{subtype_of}) {
    if (!ref $subtype_of) {
      my $from = $type_definition->{from}
        || croak "Must define a 'from' namespace for the parent type: $subtype_of when defining type: $type_definition->{name}";
      $subtype_of = do {
        no strict 'refs';
        &{$from . '::' . $subtype_of}();
      };
    }
    # Assume a (base) test always exists even if you must write: test => sub {1}
    my $base_test = $test;
    $test = sub {
      my $value = shift;
      local $@;
      eval { $subtype_of->($value); 1 } or return;
      # TODO implement: eval { $base_test->($value); 1 } paradigm
      if ($base_test) {
        $base_test->($value) or return;
      }
      return 1;
    };
  }

my $isa = sub {
    return if $test->(@_);
    local $Carp::Internal{"MooX::Types::MooseLike"} = 1;  ## no critic qw(Variables::ProhibitPackageVars)
    confess $type_definition->{message}->(@_) ;  ## no critic qw(ErrorHandling::RequireUseOfExceptions)
    };

if (ref $type_definition->{inflate}) {
    $Moo::HandleMoose::TYPE_MAP{$isa} = $type_definition->{inflate};
  }
  elsif (exists $type_definition->{inflate} and not $type_definition->{inflate}) {
    # no-op
  }
  else {
    my $full_name =
      defined $moose_namespace 
      ? "${moose_namespace}::" . $type_definition->{name}
      : $type_definition->{name};

$Moo::HandleMoose::TYPE_MAP{$isa} = sub {
      require_module($moose_namespace) if $moose_namespace;
      Moose::Util::TypeConstraints::find_type_constraint($full_name);
      };
  }

return {
    type => sub {

# If we have a parameterized type then we want to check its values
      if (ref($_[0]) eq 'ARRAY') {
        my @params = @{$_[0]};
        my $parameterized_isa = sub {

# Types that take other types as a parameter have a parameterizable
          # part with the one exception: 'AnyOf'
          if (my $parameterizer = $type_definition->{parameterizable}) {

# Can we assume @params is a list of coderefs?
            if(my $culprit = first { (ref($_) ne 'CODE') } @params) {
              croak "Expect all parameters to be coderefs, but found: $culprit";
            }

# Check the containing type. We could pass @_, but it is such that: 
            # scalar @_ = 1 always in this context.  In other words,
            # an $isa only type checks one thing at a time.
            $isa->($_[0]);

# Run the nested type coderefs on each value
            foreach my $coderef (@params) {
              foreach my $value ($parameterizer->($_[0])) {
                $coderef->($value);
              }
            }
          }
          else {
            # Note that while $isa only checks on value at a time
            # We can pass it additional parameters as we do here.
            # These additional parameters are then used in the type definition
            # For example, see InstanceOf
            $isa->($_[0], @params);
          }
          };

if (ref $type_definition->{inflate}) {
          my $inflation = $type_definition->{inflate};
          $Moo::HandleMoose::TYPE_MAP{$parameterized_isa} = sub { $inflation->(\@params) };
        }

# Remove old $isa, but return the rest of the arguments
        # so any specs defined after 'isa' don't get lost
        shift;
        return ($parameterized_isa, @_);
      }
      else {
        return $isa;
      }
      },
    is_type => sub { $test->(@_) },
    };
}

sub exception_message {
  my ($attribute_value, $type) = @_;
  $attribute_value = defined $attribute_value ? $attribute_value : 'undef';
  return "${attribute_value} is not ${type}!";
}

sub inflate_type {
  my $coderef = shift;
  if (my $inflator = $Moo::HandleMoose::TYPE_MAP{$coderef}) {
    return $inflator->();
  }
  return Moose::Meta::TypeConstraint->new(
    constraint => sub { eval { &$coderef; 1 } }
  );
}

1;
__END__

=head1 NAME

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

=head1 SYNOPSIS

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]
  );

=head1 DESCRIPTION

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 L<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.

=head1 FUNCTIONS

=head2 register_types

B<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 (I<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__);

=head2 exception_message

B<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!"

=head2 inflate_type

B<inflate_type( coderef )>

Inflates the type to a Moose type. Requires Moose.

=head1 SEE ALSO

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

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

L<MooX::Types::MooseLike::Email>, L<MooX::Types::MooseLike::DateTime>

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

=head1 AUTHOR

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

=head1 CONTRIBUTORS

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>

=head1 COPYRIGHT

=head1 LICENSE

This library is free software and may be distributed under the same terms
as perl itself.

=cut

${this.title}

Code Editor : MooseLike.pm