Add what does moose stand for section back to docs

[gitmo/Moose.git] / t / metaclasses / overloading.t

#!/usr/bin/env perl
use strict;
use warnings;
use Test::More;
use Test::Fatal;

my $quote = qr/['`"]/;

{
    package Foo;
    use Moose;
}

{
    my $meta = Foo->meta;

    ok(!$meta->is_overloaded);

    is_deeply([sort $meta->overload_operators],
              [sort map { split /\s+/ } values %overload::ops]);

    ok(!$meta->has_overloaded_operator('+'));
    ok(!$meta->has_overloaded_operator('-'));

    is_deeply([$meta->get_overload_list], []);

    is_deeply([$meta->get_all_overloaded_operators], []);

    is($meta->get_overloaded_operator('+'), undef);
    is($meta->get_overloaded_operator('-'), undef);
}

my $plus = 0;
my $plus_impl;
BEGIN { $plus_impl = sub { $plus = 1; "plus" } }
{
    package Foo::Overloaded;
    use Moose;
    use overload '+' => $plus_impl;
}

{
    my $meta = Foo::Overloaded->meta;

    ok($meta->is_overloaded);

    ok($meta->has_overloaded_operator('+'));
    ok(!$meta->has_overloaded_operator('-'));

    is_deeply([$meta->get_overload_list], ['+']);

    my @overloads = $meta->get_all_overloaded_operators;
    is(scalar(@overloads), 1);
    my $plus_meth = $overloads[0];
    isa_ok($plus_meth, 'Class::MOP::Method::Overload');
    is($plus_meth->operator, '+');
    is($plus_meth->name, '(+');
    is($plus_meth->body, $plus_impl);
    is($plus_meth->package_name, 'Foo::Overloaded');
    is($plus_meth->associated_metaclass, $meta);

    my $plus_meth2 = $meta->get_overloaded_operator('+');
    { local $TODO = "we don't cache these yet";
    is($plus_meth2, $plus_meth);
    }
    is($plus_meth2->operator, '+');
    is($plus_meth2->body, $plus_impl);
    is($meta->get_overloaded_operator('-'), undef);

    is($plus, 0);
    is(Foo::Overloaded->new + Foo::Overloaded->new, "plus");
    is($plus, 1);

    my $minus = 0;
    my $minus_impl = sub { $minus = 1; "minus" };

    like(exception { Foo::Overloaded->new - Foo::Overloaded->new },
         qr/Operation $quote-$quote: no method found/);

    $meta->add_overloaded_operator('-' => $minus_impl);

    ok($meta->has_overloaded_operator('-'));

    is_deeply([sort $meta->get_overload_list], ['+', '-']);

    is(scalar($meta->get_all_overloaded_operators), 2);

    my $minus_meth = $meta->get_overloaded_operator('-');
    isa_ok($minus_meth, 'Class::MOP::Method::Overload');
    is($minus_meth->operator, '-');
    is($minus_meth->name, '(-');
    is($minus_meth->body, $minus_impl);
    is($minus_meth->package_name, 'Foo::Overloaded');
    is($minus_meth->associated_metaclass, $meta);

    is($minus, 0);
    is(Foo::Overloaded->new - Foo::Overloaded->new, "minus");
    is($minus, 1);

    $meta->remove_overloaded_operator('-');

    like(exception { Foo::Overloaded->new - Foo::Overloaded->new },
         qr/Operation $quote-$quote: no method found/);
}

my $times = 0;
my $divided = 0;
{
    package Foo::OverloadedMethod;
    use Moose;
    use overload '*' => 'times';

    sub times   { $times = 1;   "times" }
    sub divided { $divided = 1; "divided" }
}

{
    my $meta = Foo::OverloadedMethod->meta;

    ok($meta->is_overloaded);

    ok($meta->has_overloaded_operator('*'));
    ok(!$meta->has_overloaded_operator('/'));

    is_deeply([$meta->get_overload_list], ['*']);

    my @overloads = $meta->get_all_overloaded_operators;
    is(scalar(@overloads), 1);
    my $times_meth = $overloads[0];
    isa_ok($times_meth, 'Class::MOP::Method::Overload');
    is($times_meth->operator, '*');
    is($times_meth->name, '(*');
    is($times_meth->body, $meta->get_method('times')->body);
    is($times_meth->package_name, 'Foo::OverloadedMethod');
    is($times_meth->associated_metaclass, $meta);

    my $times_meth2 = $meta->get_overloaded_operator('*');
    { local $TODO = "we don't cache these yet";
    is($times_meth2, $times_meth);
    }
    is($times_meth2->operator, '*');
    is($times_meth2->body, $meta->get_method('times')->body);
    is($meta->get_overloaded_operator('/'), undef);

    is($times, 0);
    is(Foo::OverloadedMethod->new * Foo::OverloadedMethod->new, "times");
    is($times, 1);

    like(exception { Foo::OverloadedMethod->new / Foo::OverloadedMethod->new },
         qr{Operation $quote/$quote: no method found});

    $meta->add_overloaded_operator('/' => 'divided');

    ok($meta->has_overloaded_operator('/'));

    is_deeply([sort $meta->get_overload_list], ['*', '/']);

    is(scalar($meta->get_all_overloaded_operators), 2);

    my $divided_meth = $meta->get_overloaded_operator('/');
    isa_ok($divided_meth, 'Class::MOP::Method::Overload');
    is($divided_meth->operator, '/');
    is($divided_meth->name, '(/');
    is($divided_meth->body, $meta->get_method('divided')->body);
    is($divided_meth->package_name, 'Foo::OverloadedMethod');
    is($divided_meth->associated_metaclass, $meta);

    is($divided, 0);
    is(Foo::OverloadedMethod->new / Foo::OverloadedMethod->new, "divided");
    is($divided, 1);

    $meta->remove_overloaded_operator('/');

    like(exception { Foo::OverloadedMethod->new / Foo::OverloadedMethod->new },
         qr{Operation $quote/$quote: no method found});
}

done_testing;