code: private int skipLineSpace(int index) {
  		while (index < tokens.size() && isLineSpace(tokens.get(index))) {
  			index++;
  		}
  		return index;
  	}
docs: Skip over any whitespace characters that are permitted on a given line
  (i.e. all except newlines), starting from a given index and returning the
  first index passed any whitespace encountered.