function preventOverflow()

in src/site/assets/js/bootstrap.bundle.js [3206:3307]
89 lines of code
35 McCabe index (conditional complexity)

  function preventOverflow(_ref) {
    var state = _ref.state,
        options = _ref.options,
        name = _ref.name;
    var _options$mainAxis = options.mainAxis,
        checkMainAxis = _options$mainAxis === void 0 ? true : _options$mainAxis,
        _options$altAxis = options.altAxis,
        checkAltAxis = _options$altAxis === void 0 ? false : _options$altAxis,
        boundary = options.boundary,
        rootBoundary = options.rootBoundary,
        altBoundary = options.altBoundary,
        padding = options.padding,
        _options$tether = options.tether,
        tether = _options$tether === void 0 ? true : _options$tether,
        _options$tetherOffset = options.tetherOffset,
        tetherOffset = _options$tetherOffset === void 0 ? 0 : _options$tetherOffset;
    var overflow = detectOverflow(state, {
      boundary: boundary,
      rootBoundary: rootBoundary,
      padding: padding,
      altBoundary: altBoundary
    });
    var basePlacement = getBasePlacement(state.placement);
    var variation = getVariation(state.placement);
    var isBasePlacement = !variation;
    var mainAxis = getMainAxisFromPlacement(basePlacement);
    var altAxis = getAltAxis(mainAxis);
    var popperOffsets = state.modifiersData.popperOffsets;
    var referenceRect = state.rects.reference;
    var popperRect = state.rects.popper;
    var tetherOffsetValue = typeof tetherOffset === 'function' ? tetherOffset(Object.assign({}, state.rects, {
      placement: state.placement
    })) : tetherOffset;
    var data = {
      x: 0,
      y: 0
    };

    if (!popperOffsets) {
      return;
    }

    if (checkMainAxis || checkAltAxis) {
      var mainSide = mainAxis === 'y' ? top : left;
      var altSide = mainAxis === 'y' ? bottom : right;
      var len = mainAxis === 'y' ? 'height' : 'width';
      var offset = popperOffsets[mainAxis];
      var min$1 = popperOffsets[mainAxis] + overflow[mainSide];
      var max$1 = popperOffsets[mainAxis] - overflow[altSide];
      var additive = tether ? -popperRect[len] / 2 : 0;
      var minLen = variation === start ? referenceRect[len] : popperRect[len];
      var maxLen = variation === start ? -popperRect[len] : -referenceRect[len]; // We need to include the arrow in the calculation so the arrow doesn't go
      // outside the reference bounds

      var arrowElement = state.elements.arrow;
      var arrowRect = tether && arrowElement ? getLayoutRect(arrowElement) : {
        width: 0,
        height: 0
      };
      var arrowPaddingObject = state.modifiersData['arrow#persistent'] ? state.modifiersData['arrow#persistent'].padding : getFreshSideObject();
      var arrowPaddingMin = arrowPaddingObject[mainSide];
      var arrowPaddingMax = arrowPaddingObject[altSide]; // If the reference length is smaller than the arrow length, we don't want
      // to include its full size in the calculation. If the reference is small
      // and near the edge of a boundary, the popper can overflow even if the
      // reference is not overflowing as well (e.g. virtual elements with no
      // width or height)

      var arrowLen = within(0, referenceRect[len], arrowRect[len]);
      var minOffset = isBasePlacement ? referenceRect[len] / 2 - additive - arrowLen - arrowPaddingMin - tetherOffsetValue : minLen - arrowLen - arrowPaddingMin - tetherOffsetValue;
      var maxOffset = isBasePlacement ? -referenceRect[len] / 2 + additive + arrowLen + arrowPaddingMax + tetherOffsetValue : maxLen + arrowLen + arrowPaddingMax + tetherOffsetValue;
      var arrowOffsetParent = state.elements.arrow && getOffsetParent(state.elements.arrow);
      var clientOffset = arrowOffsetParent ? mainAxis === 'y' ? arrowOffsetParent.clientTop || 0 : arrowOffsetParent.clientLeft || 0 : 0;
      var offsetModifierValue = state.modifiersData.offset ? state.modifiersData.offset[state.placement][mainAxis] : 0;
      var tetherMin = popperOffsets[mainAxis] + minOffset - offsetModifierValue - clientOffset;
      var tetherMax = popperOffsets[mainAxis] + maxOffset - offsetModifierValue;

      if (checkMainAxis) {
        var preventedOffset = within(tether ? min(min$1, tetherMin) : min$1, offset, tether ? max(max$1, tetherMax) : max$1);
        popperOffsets[mainAxis] = preventedOffset;
        data[mainAxis] = preventedOffset - offset;
      }

      if (checkAltAxis) {
        var _mainSide = mainAxis === 'x' ? top : left;

        var _altSide = mainAxis === 'x' ? bottom : right;

        var _offset = popperOffsets[altAxis];

        var _min = _offset + overflow[_mainSide];

        var _max = _offset - overflow[_altSide];

        var _preventedOffset = within(tether ? min(_min, tetherMin) : _min, _offset, tether ? max(_max, tetherMax) : _max);

        popperOffsets[altAxis] = _preventedOffset;
        data[altAxis] = _preventedOffset - _offset;
      }
    }

    state.modifiersData[name] = data;
  } // eslint-disable-next-line import/no-unused-modules