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package Catmandu::Fix::vacuum;
use Catmandu::Sane;
our $VERSION = '1.2024';
use Catmandu::Util qw(is_value is_hash_ref is_array_ref);
use Scalar::Util qw(refaddr);
use Moo;
use namespace::clean;
with 'Catmandu::Fix::Inlineable';
sub _visit {
my ($self, $v) = @_;
(is_hash_ref($v) && %$v) || (is_array_ref($v) && @$v);
}
sub _empty {
my ($self, $v) = @_;
!defined($v)
|| (is_value($v) && $v !~ /\S/)
|| (is_hash_ref($v) && !%$v)
|| (is_array_ref($v) && !@$v);
}
sub fix {
my ($self, $data) = @_;
return $data unless $self->_visit($data);
my @stack = ($data);
my %seen;
while (@stack) {
my $d = pop @stack;
my $id = refaddr($d);
if ($seen{$id}) {
if (is_hash_ref($d)) {
for my $k (keys %$d) {
delete $d->{$k} if $self->_empty($d->{$k});
}
}
elsif (is_array_ref($d)) {
my @vals = grep {!$self->_empty($_)} @$d;
splice(@$d, 0, @$d, @vals);
}
}
else {
$seen{$id} = 1;
push @stack, $d;
if (is_hash_ref($d)) {
for my $k (keys %$d) {
my $v = $d->{$k};
if ($self->_empty($v)) {
delete $d->{$k};
}
elsif ($self->_visit($v)) {
push @stack, $v;
}
}
}
elsif (is_array_ref($d)) {
my @vals;
for my $v (@$d) {
next if $self->_empty($v);
push @vals, $v;
push @stack, $v if $self->_visit($v);
}
splice @$d, 0, @$d, @vals;
}
}
}
$data;
}
1;
__END__
=pod
=head1 NAME
Catmandu::Fix::vacuum - delete all empty fields from your data
=head1 SYNOPSIS
# Delete all the empty fields
#
# input:
#
# foo: ''
# bar: []
# relations: {}
# test: 123
#
vacuum()
# output:
#
# test: 123
#
=head1 SEE ALSO
L<Catmandu::Fix>
=cut
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