+ function canTop(cls, rec) {
+
+ rec = rec || 0;
+ //print('CANTOP: ' + cls + ' =' + rec);
+ if (rec > 5) {
+ // print('SKIP : ' + cls);
+ }
+ if (typeof(tops[cls]) == 'undefined') {
+ return false;
+ }
+ for (var i =0; i < tops[cls].length; i++) {
+ if (tops[cls][i] == '*top') {
+ return true;
+ }
+ if (cls == tops[cls][i]) {
+ continue;
+ }
+ if (canTop(tops[cls][i], rec+1)) {
+ return true;
+ }
+ }
+ return false;
+
+ }
+ var nusage = {};
+ var usage_left = {};