Method _preserveStack

src/common/InputHandler.ts:387–393

* Async parse support.

(cursorStartX: number, cursorStartY: number, decodedLength: number, position: number)

   * Async parse support.
   */
  private _preserveStack(cursorStartX: number, cursorStartY: number, decodedLength: number, position: number): void {
    this._parseStack.paused = true;
    this._parseStack.cursorStartX = cursorStartX;
    this._parseStack.cursorStartY = cursorStartY;
    this._parseStack.decodedLength = decodedLength;
    this._parseStack.position = position;
  }

  private _logSlowResolvingAsync(p: Promise<boolean>): void {
    // log a limited warning about an async handler taking too long