Do not recreate hash on every construction

[gitmo/MooseX-StrictConstructor.git] / lib / MooseX / StrictConstructor / Trait / Method / Constructor.pm

package MooseX::StrictConstructor::Trait::Method::Constructor;

use Moose::Role;

use namespace::autoclean;

use B ();

around '_generate_BUILDALL' => sub {
    my $orig = shift;
    my $self = shift;

    my $source = $self->$orig();
    $source .= ";\n" if $source;

    my @attrs = (
        '__INSTANCE__ => 1,',
        map { B::perlstring($_) . ' => 1,' }
        grep {defined}
        map  { $_->init_arg() } @{ $self->_attributes() }
    );

    my $MY = 'my';
    if ($] >= 5.009004) {
        $source .= "use feature 'state';\n";
        $MY = 'state';
    }

    $source .= <<"EOF";
$MY \$attrs = { @attrs };
if (my \@bad = sort grep { ! \$attrs->{\$_} } keys %\$params) {
    Moose->throw_error("Found unknown attribute(s) passed to the constructor: \@bad");
}
EOF

    return $source;
};

1;

# ABSTRACT: A role to make immutable constructors strict

__END__

=pod

=head1 DESCRIPTION

This role simply wraps C<_generate_BUILDALL()> (from
C<Moose::Meta::Method::Constructor>) so that immutable classes have a
strict constructor.

=cut