function Range(fromRow, fromCell, toRow, toCell) {
    if (toRow === undefined && toCell === undefined) {
      toRow = fromRow;
      toCell = fromCell;
    }

    /***
     * @property fromRow
     * @type {Integer}
     */
    this.fromRow = Math.min(fromRow, toRow);

    /***
     * @property fromCell
     * @type {Integer}
     */
    this.fromCell = Math.min(fromCell, toCell);

    /***
     * @property toRow
     * @type {Integer}
     */
    this.toRow = Math.max(fromRow, toRow);

    /***
     * @property toCell
     * @type {Integer}
     */
    this.toCell = Math.max(fromCell, toCell);

    /***
     * Returns whether a range represents a single row.
     * @method isSingleRow
     * @return {Boolean}
     */
    this.isSingleRow = function () {
      return this.fromRow == this.toRow;
    };

    /***
     * Returns whether a range represents a single cell.
     * @method isSingleCell
     * @return {Boolean}
     */
    this.isSingleCell = function () {
      return this.fromRow == this.toRow && this.fromCell == this.toCell;
    };

    /***
     * Returns whether a range contains a given cell.
     * @method contains
     * @param row {Integer}
     * @param cell {Integer}
     * @return {Boolean}
     */
    this.contains = function (row, cell) {
      return row >= this.fromRow && row <= this.toRow &&
          cell >= this.fromCell && cell <= this.toCell;
    };

    /***
     * Returns a readable representation of a range.
     * @method toString
     * @return {String}
     */
    this.toString = function () {
      if (this.isSingleCell()) {
        return "(" + this.fromRow + ":" + this.fromCell + ")";
      }
      else {
        return "(" + this.fromRow + ":" + this.fromCell + " - " + this.toRow + ":" + this.toCell + ")";
      }
    }
  }
A structure containing a range of cells.
@class Range
@constructor
@param fromRow {Integer} Starting row.
@param fromCell {Integer} Starting cell.
@param toRow {Integer} Optional. Ending row. Defaults to <code>fromRow</code>.
@param toCell {Integer} Optional. Ending cell. Defaults to <code>fromCell</code>.