Class Buffer

src/common/buffer/Buffer.ts:28–662

 *   - scroll position
 */
export class Buffer implements IBuffer {
  public lines: CircularList<IBufferLine>;
  public ydisp: number = 0;
  public ybase: number = 0;
  public y: number = 0;
  public x: number = 0;
  public scrollBottom: number;
  public scrollTop: number;
  public tabs: { [column: number]: boolean | undefined } = {};
  public savedY: number = 0;
  public savedX: number = 0;
  public savedCurAttrData = DEFAULT_ATTR_DATA.clone();
  public savedCharset: ICharset | undefined = DEFAULT_CHARSET;
  public markers: Marker[] = [];
  private _nullCell: ICellData = CellData.fromCharData([0, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]);
  private _whitespaceCell: ICellData = CellData.fromCharData([0, WHITESPACE_CELL_CHAR, WHITESPACE_CELL_WIDTH, WHITESPACE_CELL_CODE]);
  private _cols: number;
  private _rows: number;
  private _isClearing: boolean = false;

  constructor(
    private _hasScrollback: boolean,
    private _optionsService: IOptionsService,
    private _bufferService: IBufferService
  ) {
    this._cols = this._bufferService.cols;
    this._rows = this._bufferService.rows;
    this.lines = new CircularList<IBufferLine>(this._getCorrectBufferLength(this._rows));
    this.scrollTop = 0;
    this.scrollBottom = this._rows - 1;
    this.setupTabStops();
  }

  public getNullCell(attr?: IAttributeData): ICellData {
    if (attr) {
      this._nullCell.fg = attr.fg;
      this._nullCell.bg = attr.bg;
      this._nullCell.extended = attr.extended;
    } else {
      this._nullCell.fg = 0;
      this._nullCell.bg = 0;
      this._nullCell.extended = new ExtendedAttrs();
    }
    return this._nullCell;
  }

  public getWhitespaceCell(attr?: IAttributeData): ICellData {
    if (attr) {
      this._whitespaceCell.fg = attr.fg;
      this._whitespaceCell.bg = attr.bg;
      this._whitespaceCell.extended = attr.extended;
    } else {
      this._whitespaceCell.fg = 0;
      this._whitespaceCell.bg = 0;
      this._whitespaceCell.extended = new ExtendedAttrs();
    }
    return this._whitespaceCell;
  }