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#!/usr/bin/perl
use strict;
use warnings;
use Test::More;
{
package Human;
use Moose;
use Moose::Util::TypeConstraints;
subtype 'Gender'
=> as 'Str'
=> where { $_ =~ m{^[mf]$}s };
has 'gender' => ( is => 'ro', isa => 'Gender', required => 1 );
has 'mother' => ( is => 'ro', isa => 'Human' );
has 'father' => ( is => 'ro', isa => 'Human' );
use overload '+' => \&_overload_add, fallback => 1;
sub _overload_add {
my ( $one, $two ) = @_;
die('Only male and female humans may create children')
if ( $one->gender() eq $two->gender() );
my ( $mother, $father )
= ( $one->gender eq 'f' ? ( $one, $two ) : ( $two, $one ) );
my $gender = 'f';
$gender = 'm' if ( rand() >= 0.5 );
return Human->new(
gender => $gender,
eye_color => ( $one->eye_color() + $two->eye_color() ),
mother => $mother,
father => $father,
);
}
use List::MoreUtils qw( zip );
coerce 'Human::EyeColor'
=> from 'ArrayRef'
=> via { my @genes = qw( bey2_1 bey2_2 gey_1 gey_2 );
return Human::EyeColor->new( zip( @genes, @{$_} ) ); };
has 'eye_color' => (
is => 'ro',
isa => 'Human::EyeColor',
coerce => 1,
required => 1,
);
}
{
package Human::Gene::bey2;
use Moose;
use Moose::Util::TypeConstraints;
type 'bey2_color' => where { $_ =~ m{^(?:brown|blue)$} };
has 'color' => ( is => 'ro', isa => 'bey2_color' );
}
{
package Human::Gene::gey;
use Moose;
use Moose::Util::TypeConstraints;
type 'gey_color' => where { $_ =~ m{^(?:green|blue)$} };
has 'color' => ( is => 'ro', isa => 'gey_color' );
}
{
package Human::EyeColor;
use Moose;
use Moose::Util::TypeConstraints;
coerce 'Human::Gene::bey2'
=> from 'Str'
=> via { Human::Gene::bey2->new( color => $_ ) };
coerce 'Human::Gene::gey'
=> from 'Str'
=> via { Human::Gene::gey->new( color => $_ ) };
has [qw( bey2_1 bey2_2 )] =>
( is => 'ro', isa => 'Human::Gene::bey2', coerce => 1 );
has [qw( gey_1 gey_2 )] =>
( is => 'ro', isa => 'Human::Gene::gey', coerce => 1 );
sub color {
my ($self) = @_;
return 'brown'
if ( $self->bey2_1->color() eq 'brown'
or $self->bey2_2->color() eq 'brown' );
return 'green'
if ( $self->gey_1->color() eq 'green'
or $self->gey_2->color() eq 'green' );
return 'blue';
}
use overload '""' => \&color, fallback => 1;
use overload '+' => \&_overload_add, fallback => 1;
sub _overload_add {
my ( $one, $two ) = @_;
my $one_bey2 = 'bey2_' . _rand2();
my $two_bey2 = 'bey2_' . _rand2();
my $one_gey = 'gey_' . _rand2();
my $two_gey = 'gey_' . _rand2();
return Human::EyeColor->new(
bey2_1 => $one->$one_bey2->color(),
bey2_2 => $two->$two_bey2->color(),
gey_1 => $one->$one_gey->color(),
gey_2 => $two->$two_gey->color(),
);
}
sub _rand2 {
return 1 + int( rand(2) );
}
}
my $gene_color_sets = [
[ qw( blue blue blue blue ) => 'blue' ],
[ qw( blue blue green blue ) => 'green' ],
[ qw( blue blue blue green ) => 'green' ],
[ qw( blue blue green green ) => 'green' ],
[ qw( brown blue blue blue ) => 'brown' ],
[ qw( brown brown green green ) => 'brown' ],
[ qw( blue brown green blue ) => 'brown' ],
];
foreach my $set (@$gene_color_sets) {
my $expected_color = pop(@$set);
my $person = Human->new(
gender => 'f',
eye_color => $set,
);
is(
$person->eye_color(),
$expected_color,
'gene combination '
. join( ',', @$set )
. ' produces '
. $expected_color
. ' eye color',
);
}
my $parent_sets = [
[
[qw( blue blue blue blue )],
[qw( blue blue blue blue )] => 'blue'
],
[
[qw( blue blue blue blue )],
[qw( brown brown green blue )] => 'brown'
],
[
[qw( blue blue green green )],
[qw( blue blue green green )] => 'green'
],
];
foreach my $set (@$parent_sets) {
my $expected_color = pop(@$set);
my $mother = Human->new(
gender => 'f',
eye_color => shift(@$set),
);
my $father = Human->new(
gender => 'm',
eye_color => shift(@$set),
);
my $child = $mother + $father;
is(
$child->eye_color(),
$expected_color,
'mother '
. $mother->eye_color()
. ' + father '
. $father->eye_color()
. ' = child '
. $expected_color,
);
}
# Hmm, not sure how to test for random selection of genes since
# I could theoretically run an infinite number of iterations and
# never find proof that a child has inherited a particular gene.
# AUTHOR: Aran Clary Deltac <bluefeet@cpan.org>
done_testing;
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