--- /dev/null
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use Data::Dumper;
+use Getopt::Long 2.33 qw(HelpMessage :config bundling);
+
+our $VERSION = '1.00';
+
+GetOptions(\my %opt,
+ 'raw|r',
+) or HelpMessage(-exitval => 2);
+
+my $MAGICID = "WormEdit053\000LVL";
+
+my @FORMAT = (
+ magic => 'a15',
+ version => 'C',
+ name => 'Ca32',
+ description => 'Ca64x256',
+ levelcount => [1,
+ single => 'C',
+ multi => 'C',
+ race => 'C',
+ ctf => 'C',
+ total => 'C',
+ ],
+ moderef => [1,
+ map { (start => $_, end => $_) } [1,
+ single => 'C',
+ peaworm => 'C',
+ tron => 'C',
+ deathmatch => 'C',
+ foodmatch => 'C',
+ multifood => 'C',
+ timematch => 'C',
+ race => 'C',
+ ctf => 'Cx',
+ ],
+ ],
+ sprite => ['8C',
+ line => 'B8',
+ ],
+ endtype => 's',
+ endstr => 'Ca255',
+ enddata => 'Ca255x256',
+ hiname => 'a3',
+ levels => ['*', # levelcount->total actually
+ id => 'Ca22',
+ name => 'Ca22',
+ size => 'C',
+ peas => 'C',
+ delay => 'C',
+ growth => 'C',
+ bsize => 'C',
+ sprite => ['8C',
+ line => 'B8',
+ ],
+ balls => ['32C',
+ y => 'C',
+ x => 'C',
+ dir => 'C',
+ ],
+ worms => [4,
+ d => 'C',
+ y => 'C',
+ x => 'C',
+ ],
+ width => 'C',
+ height => 'C',
+ flags => [2,
+ y => 'C',
+ x => 'C',
+ ],
+ objects => ['128C',
+ type => 'C',
+ x1 => 'C',
+ y1 => 'C',
+ x2 => 'C',
+ y2 => 'C',
+ ],
+ ],
+);
+
+# read and parse all input data
+local $/;
+my @rawdata = unpack Shiar_Parse::Nested->template(\@FORMAT).'a*', readline;
+$rawdata[0] eq $MAGICID
+ or die "File does not match WormEdit level header\n";
+$rawdata[1] == 53
+ or warn "Unsupported version $rawdata[1] (expecting 53)\n";
+
+# convert to an easily accessible hash
+my $data = Shiar_Parse::Nested->convert(\@FORMAT, \@rawdata);
+warn "Trailing data left unparsed\n" if grep {length} @rawdata;
+
+# output with user-preferred formatting
+if ($opt{raw}) {
+ require JSON::XS;
+ my $output = JSON::XS->new->ascii->canonical->pretty->allow_nonref;
+ print $output->encode($data), "\n";
+}
+else {
+ print "$data->{name} ($data->{description})\n";
+ my $startnr = 0;
+ for my $variant (qw/single multi race ctf/) {
+ print "\n";
+ my $count = $data->{levelcount}->{$variant};
+ printf "\u$variant ($count)";
+ $count or next;
+ print ":";
+ printf("\n- %-22s (%3sx%3s, %d objects)",
+ $_->{id}, $_->{width}, $_->{height}, scalar @{ $_->{objects} },
+ ) for map { $data->{levels}->[$_ + $startnr] }
+ 0 .. $count - 1;
+ $startnr += $count;
+ }
+ continue {
+ print "\n";
+ }
+}
+
+package Shiar_Parse::Nested;
+
+sub template {
+ my ($self, $format) = @_;
+ # total (flattened) unpack template from nested format definitions
+ return join '', map {
+ my $value = $format->[-($_ << 1) - 1];
+ if (ref $value eq 'ARRAY') {
+ my $count = $value->[0];
+ $value = $self->template($value);
+ $value = $count =~ s/^([*\d]+)// ? "$count($value)$1"
+ : $count."X[$count]$count/($value)";
+ }
+ else {
+ $value =~ s/^C(a)(\d+)/$1 . ($2 + 1)/e; # length prefix
+ }
+ $value;
+ } reverse 0 .. ($#$format - 1) >> 1;
+}
+
+sub convert {
+ my ($self, $format, $data) = @_;
+ # map flat results into a named and nested hash
+ my %res;
+ while (my ($field, $template) = splice @$format, 0, 2) {
+ if (ref $template eq 'ARRAY') {
+ my ($count, @subformat) = @$template;
+ my $max = $count =~ s/^(\d+)// ? $1 : 0;
+ $count = !$count ? $max
+ : $count eq '*' ? $res{levelcount}->{total} : shift @$data;
+ $max ||= $count;
+ $res{$field}->[$_] = $self->convert([@subformat], $data) for 0 .. $max-1;
+ splice @{ $res{$field} }, $count if $max > $count;
+ $res{$field} = $res{$field}->[0] if $max == 1;
+ next;
+ }
+ elsif ($template =~ /^Ca/) {
+ $data->[0] = unpack 'C/a', $data->[0];
+ }
+ $res{$field} = shift @$data;
+ }
+ return \%res;
+}
+
+__END__
+
+=head1 NAME
+
+parse-wormedit - WormEdit level data parser
+
+=head1 SYNOPSIS
+
+ parse-wormedit [--raw] <input.lvl>
+
+=head1 DESCRIPTION
+
+Reads WormEdit v0.53 levels from STDIN or given file,
+and outputs contents, summarised or in full.
+
+=head1 AUTHOR
+
+Mischa POSLAWSKY <wormy@shiar.org>
+
+=head1 LICENSE
+
+GPL version 3.
+