}, $_[0];
}
+sub topmost {
+ my ($self) = @_;
+ my @q = ($self);
+ while (my $cont = shift @q) {
+ return $cont if $cont->{smsg};
+ push @q, values %{$cont->{children}};
+ }
+ undef;
+}
+
sub add_child {
my ($self, $child) = @_;
croak "Cowardly refusing to become my own parent: $self"
if $self == $child;
my $cid = $child->{id};
- $self->{children}->{$cid} = $child;
# reparenting:
if (defined(my $parent = $child->{parent})) {
delete $parent->{children}->{$cid};
}
+ $self->{children}->{$cid} = $child;
$child->{parent} = $self;
}
sub has_descendent {
- my ($cur, $child) = @_;
- my %seen;
- my @q = ($cur->{parent} || $cur);
-
- while (defined($cur = shift @q)) {
- return 1 if $cur == $child;
-
- if (!$seen{$cur}++) {
- push @q, values %{$cur->{children}};
- }
+ my ($self, $child) = @_;
+ while ($child) {
+ return 1 if $self == $child;
+ $child = $child->{parent};
}
0;
}