Swiper loop index slide

gistfile1.txt

function getSlideDataIndex(swipe) {
    var activeIndex = swipe.activeIndex;
    var slidesLen = swipe.slides.length;
    if (swipe.params.loop) {
      switch (swipe.activeIndex) {
        case 0:
          activeIndex = slidesLen - 3;
          break;
        case slidesLen - 1:
          activeIndex = 0;
          break;
        default:
          --activeIndex;
      }
    }
    return activeIndex;
  }