package Catmandu::Fix::retain_field;
use Catmandu::Sane;
use Catmandu::Util qw(:is :data);
use Moo;
has path => (is => 'ro', required => 1);
has key => (is => 'ro', required => 1);
around BUILDARGS => sub {
my ($orig, $class, $path) = @_;
my ($p, $key) = parse_data_path($path);
$orig->($class, path => $p, key => $key);
};
sub fix {
my ($self, $data) = @_;
my $key = $self->key;
for my $match (grep ref, data_at($self->path, $data)) {
if (is_array_ref($match)) {
splice @$match, 0, @$match, get_data($match, $key);
} else {
for (keys %$match) {
delete $match->{$_} unless $_ eq $key;
}
}
}
$data;
}
=head1 NAME
Catmandu::Fix::retain_field - delete everything from a field except
=head1 SYNOPSIS
# Delete every key from foo except bar
retain_field('foo.bar');
=head1 SEE ALSO
L<Catmandu::Fix>
=cut
1;