code: function get(start, end) {
  			var result = [],
  				i;
  
  			for (i = Math.max(0, start); i < end && i < length; i++) {
  				result.push(tokens[i]);
  			}
  
  			return result;
  		}
docs: Gets tokens in a given interval.
  @param {int} start Inclusive index of the first token. 0 if negative.
  @param {int} end Exclusive index of the last token.
  @returns {Token[]} Tokens in the interval.