/**
 * Created by nuintun on 2015/11/25.
 */

'use strict';

module.exports = function (Terminal){
  // CSI Ps S  Scroll up Ps lines (default = 1) (SU).
  Terminal.prototype.scrollUp = function (params){
    var param = params[0] || 1;

    while (param--) {
      this.lines.splice(this.ybase + this.scrollTop, 1);
      this.lines.splice(this.ybase + this.scrollBottom, 0, this.blankLine());
    }
    
    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
  };

  // CSI Ps T  Scroll down Ps lines (default = 1) (SD).
  Terminal.prototype.scrollDown = function (params){
    var param = params[0] || 1;

    while (param--) {
      this.lines.splice(this.ybase + this.scrollBottom, 1);
      this.lines.splice(this.ybase + this.scrollTop, 0, this.blankLine());
    }

    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
  };
};