dump a perl data structure in a compact, human readable format
I wrote the following pair of functions for debugging Regexp::Assemble. It only deals with hashes, arrays and undef, but it sounds like that that's all you need.
The display is about as minimal and compact as I can get it.
sub _dump {
my $path = shift;
return _dump_node( $path ) if ref($path) eq 'HASH';
my $dump = '[';
my $d;
my $nr = 0;
for $d( @$path ) {
$dump .= ' ' if $nr++;
if( ref($d) eq 'HASH' ) {
$dump .= _dump_node($d);
}
elsif( ref($d) eq 'ARRAY' ) {
$dump .= _dump($d);
}
elsif( defined $d ) {
$dump .= (
($d =~ /\s/ or not length $d)
? qq{'$d'}
: $d
);
}
else {
$dump .= '*';
}
}
$dump . ']';
}
sub _dump_node {
my $node = shift;
my $dump = '{';
my $nr = 0;
my $n;
for $n (sort keys %$node) {
$dump .= ' ' if $nr++;
if( $n eq '' and not defined $node->{$n} ) {
$dump .= '*';
}
else {
$dump .= "$n=>" . (
ref($node->{$n}) eq 'ARRAY'
? _dump($node->{$n})
: $node->{$n}
);
}
}
$dump . '}';
}
I wasn't able to make complete sense of your data structure; I suspect you just invented it off the top of your head. Nevertheless:
my $ref = {
a => [ 1, 2, 3 ],
b => [
{ X => 1, Y=> 2 },
{
X => [ 1, 2, 3 ],
Y => [ 4, 5, 6 ],
Z => [ 7, 8, 9 ]
},
],
};
print _dump($ref);
produces
{a=>[1 2 3] b=>[{X=>1 Y=>2} {X=>[1 2 3] Y=>[4 5 6] Z=>[7 8 9]}]}
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