/**
 * Created by nuintun on 2015/11/24.
 */

'use strict';

var states = require('../states');

module.exports = function (Terminal){
  // ESC D Index (IND is 0x84).
  Terminal.prototype.index = function (){
    this.y++;

    if (this.y > this.scrollBottom) {
      this.y--;
      this.scroll();
    }

    this.state = states.normal;
  };

  // ESC M Reverse Index (RI is 0x8d).
  Terminal.prototype.reverseIndex = function (){
    var j;

    this.y--;

    if (this.y < this.scrollTop) {
      this.y++;

      // possibly move the code below to term.reverseScroll();
      // test: echo -ne '\e[1;1H\e[44m\eM\e[0m'
      // blankLine(true) is xterm/linux behavior
      this.lines.splice(this.y + this.ybase, 0, this.blankLine(true));

      j = this.rows - 1 - this.scrollBottom;

      this.lines.splice(this.rows - 1 + this.ybase - j + 1, 1);
      this.updateRange(this.scrollTop);
      this.updateRange(this.scrollBottom);
    }

    this.state = states.normal;
  };
};