Data Dumper is *everyone's* friend (though you'd want to make sure that the default output for your version is the same as for mine):
use Data::Dumper;
sub tell_structure {
(my $string = Dumper(shift)) =~ s/\$VAR1 = //;
my %regexes = (
qr/^\[\s*/ => 'array',
qr/^\{\s*'\w*' => / => 'hash',
qr/^'\w*',*\n/ => 'value',
);
my @result;
my $regex = join "|", keys %regexes;
OUTER: while ($string =~ /$regex/) {
for my $regex (keys %regexes) {
if ($string =~ s/$regex//s) {
last OUTER if $regexes{$regex} eq 'value';
push @result, $regexes{$regex};
last;
}
}
}
return @result;
}
Then you can compare the contents of two returned arrays to determine whether the structures referenced are the same. Or you cd use this to tell you what you've got:
sub print_results {
if (@_ == 0) {
print "This data structure is a scalar";
}
else {
if ($_[0] eq 'array') {
print "This data structure is an array";
}
else {
print "This data structure is a hash";
}
shift;
for (@_) {
if ($_ eq 'hash') {
print ' of hashes';
}
elsif ($_ eq 'array') {
print ' of arrays';
}
}
}
print "!\n";
}
§ George Sherston
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