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TOBYINK / Type-Tiny-2.008000 / examples / datetime-coercions.pl 

            

              
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=pod
=encoding utf-8
=head1 PURPOSE
This example expands upon the Example::Types library defined in
L<Type::Tiny::Manual::Libraries>. It defines class types for L<DateTime>
and L<DateTime::Duration> and some structured types for hashes that
can be used to instantiate DateTime objects. It defines some coercions
for the C<Datetime> class type.
A simple L<Moose> class is provided using some of these types and
coercions. The class also defines a couple of extra coercions inline.
See the source code of this file for the actual example code.
=head1 DEPENDENCIES
L<Moose>, L<DateTime>.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2013-2024 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.
=cut
use strict;
use warnings;
use lib "lib", "../lib";
BEGIN {
        package Example::Types;
         
        use Type::Library
                -base,
                -declare => qw( Datetime DatetimeHash Duration EpochHash );
        use Type::Utils;
        use Types::Standard -types;
         
        require DateTime;
        require DateTime::Duration;
         
        class_type Datetime, { class => "DateTime" };
         
        class_type Duration, { class => "DateTime::Duration" };
         
        declare DatetimeHash,
                as Dict[
                        year       => Int,
                        month      => Optional[ Int ],
                        day        => Optional[ Int ],
                        hour       => Optional[ Int ],
                        minute     => Optional[ Int ],
                        second     => Optional[ Int ],
                        nanosecond => Optional[ Int ],
                        time_zone  => Optional[ Str ],
                ];
         
        declare EpochHash,
                as Dict[
                        epoch      => Int,
                        time_zone  => Optional[ Str ],
                ];
         
        coerce Datetime,
                from Int,          via { "DateTime"->from_epoch(epoch => $_) },
                from Undef,        via { "DateTime"->now },
                from DatetimeHash, via { "DateTime"->new(%$_) },
                from EpochHash,    via { "DateTime"->from_epoch(%$_) };
         
        $INC{"Example/Types.pm"} = __FILE__;
};
BEGIN {
        package Person;
         
        use Moose;
        use Types::Standard qw( Str Int Num );
        use Example::Types qw( Datetime Duration );
         
        has name => (
                is       => "ro",
                isa      => Str,
                required => 1,
        );
         
        has age => (
                is       => "ro",
                isa      => Int->plus_coercions(Num, 'int($_)', Duration, '$_->years'),
                coerce   => 1,
                init_arg => undef,
                lazy     => 1,
                builder  => "_build_age",
        );
         
        has date_of_birth => (
                is       => "ro",
                isa      => Datetime,
                coerce   => 1,
                required => 1,
        );
         
        sub _build_age
        {
                my $self = shift;
                return Datetime->class->now - $self->date_of_birth;
        }
};
my $me = Person->new(
        name          => "Toby Inkster",
        date_of_birth => { epoch => 328646500, time_zone => "Asia/Tokyo" },
);
printf("%s is %d years old.\n", $me->name, $me->age);