On Tue, Jun 14, 2011 at 01:56, Jesse Luehrs <d...@tozt.net> wrote:
> On Mon, Jun 13, 2011 at 06:45:10PM +0200, Ævar Arnfjörð Bjarmason wrote:
>> On Mon, Jun 13, 2011 at 18:39, Ævar Arnfjörð Bjarmason <ava...@gmail.com>
>> wrote:
>> > For Mouse this monkeypatching would work:
>>
>> And this would work for Moose:
>>
>> package Foo;
>> use Moose;
>> {
>> package Moose::Meta::Attribute;
>>
>> sub verify_against_type_constraint {
>> my $self = shift;
>> my $val = shift;
>>
>> return 1 if !$self->has_type_constraint;
>>
>> my $type_constraint = $self->type_constraint;
>>
>> $type_constraint->check($val)
>> || Carp::cluck("Attribute ("
>> . $self->name
>> . ") does not pass the type constraint because: "
>> . $type_constraint->get_message($val), data => $val,
>> @_);
>> }
>> }
>>
>> has x => (is => "ro", isa => "Int");
>> my $foo = Foo->new(x => "blah");
>> use Data::Dumper;
>> print Dumper $foo;
>>
>> And give you:
>>
>> $ perl -Ilib /tmp/error.pl
>> Subroutine RegexpRef redefined at
>> lib/Moose/Util/TypeConstraints/OptimizedConstraints.pm line 35.
>> Subroutine verify_against_type_constraint redefined at /tmp/error.pl
>> line 6.
>> Attribute (x) does not pass the type constraint because:
>> Validation failed for 'Int' with value
>> blahdatablahinstanceFoo=HASH(0x1edadb0) at /tmp/error.pl line 14
>>
>> Moose::Meta::Attribute::verify_against_type_constraint('Moose::Meta::Attribute=HASH(0x27e0078)',
>> 'blah', 'instance', 'Foo=HASH(0x1edadb0)') called at
>> lib/Moose/Meta/Attribute.pm line 1125
>>
>> Moose::Meta::Attribute::_coerce_and_verify('Moose::Meta::Attribute=HASH(0x27e0078)',
>> 'blah', 'Foo=HASH(0x1edadb0)') called at lib/Moose/Meta/Attribute.pm
>> line 485
>>
>> Moose::Meta::Attribute::initialize_instance_slot('Moose::Meta::Attribute=HASH(0x27e0078)',
>> 'Moose::Meta::Instance=HASH(0x27ad5c0)', 'Foo=HASH(0x1edadb0)',
>> 'HASH(0x1ec8f90)') called at lib/Class/MOP/Class.pm line 575
>>
>> Class::MOP::Class::_construct_instance('Moose::Meta::Class=HASH(0x266bab0)',
>> 'HASH(0x1ec8f90)') called at lib/Class/MOP/Class.pm line 548
>>
>> Class::MOP::Class::new_object('Moose::Meta::Class=HASH(0x266bab0)',
>> 'HASH(0x1ec8f90)') called at lib/Moose/Meta/Class.pm line 252
>>
>> Moose::Meta::Class::new_object('Moose::Meta::Class=HASH(0x266bab0)',
>> 'HASH(0x1ec8f90)') called at lib/Moose/Object.pm line 22
>> Moose::Object::new('Foo', 'x', 'blah') called at
>> /tmp/error.pl line 23
>> $VAR1 = bless( {
>> 'x' => 'blah'
>> }, 'Foo' );
>>
>
> For the record, please please PLEASE don't do this. Attribute traits
> exist for a reason.
How would you accomplish the same thing with attribute traits?
