code: function getKeys(code) {
  		var reKeys = /KEYS\[\s*(\d+)\s*\]/g
  		,	match
  		,	max = 0, d = 1000;
  		while ((match = reKeys.exec(code)) && d > 0) {
  			if (parseInt(match[1], 10) > max)
  				max = parseInt(match[1], 10);
  			d--;
  		}
  		self._keys[scriptName] = max;
  		done(code);
  	}
docs: get highes value of KEYS[]