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View File Name : popper-utils.js

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.PopperUtils = {}));
}(this, (function (exports) { 'use strict';

  /**
   * Get CSS computed property of the given element
   * @method
   * @memberof Popper.Utils
   * @argument {Eement} element
   * @argument {String} property
   */
  function getStyleComputedProperty(element, property) {
    if (element.nodeType !== 1) {
      return [];
    }
    // NOTE: 1 DOM access here
    var window = element.ownerDocument.defaultView;
    var css = window.getComputedStyle(element, null);
    return property ? css[property] : css;
  }

  /**
   * Returns the parentNode or the host of the element
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @returns {Element} parent
   */
  function getParentNode(element) {
    if (element.nodeName === 'HTML') {
      return element;
    }
    return element.parentNode || element.host;
  }

  /**
   * Returns the scrolling parent of the given element
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @returns {Element} scroll parent
   */
  function getScrollParent(element) {
    // Return body, `getScroll` will take care to get the correct `scrollTop` from it
    if (!element) {
      return document.body
    }

    switch (element.nodeName) {
      case 'HTML':
      case 'BODY':
        return element.ownerDocument.body
      case '#document':
        return element.body
    }

    // Firefox want us to check `-x` and `-y` variations as well
    var ref = getStyleComputedProperty(element);
    var overflow = ref.overflow;
    var overflowX = ref.overflowX;
    var overflowY = ref.overflowY;
    if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
      return element;
    }

    return getScrollParent(getParentNode(element));
  }

  /**
   * Returns the reference node of the reference object, or the reference object itself.
   * @method
   * @memberof Popper.Utils
   * @param {Element|Object} reference - the reference element (the popper will be relative to this)
   * @returns {Element} parent
   */
  function getReferenceNode(reference) {
    return reference && reference.referenceNode ? reference.referenceNode : reference;
  }

  var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && typeof navigator !== 'undefined';

  var isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
  var isIE10 = isBrowser && /MSIE 10/.test(navigator.userAgent);

  /**
   * Determines if the browser is Internet Explorer
   * @method
   * @memberof Popper.Utils
   * @param {Number} version to check
   * @returns {Boolean} isIE
   */
  function isIE(version) {
    if (version === 11) {
      return isIE11;
    }
    if (version === 10) {
      return isIE10;
    }
    return isIE11 || isIE10;
  }

  /**
   * Returns the offset parent of the given element
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @returns {Element} offset parent
   */
  function getOffsetParent(element) {
    if (!element) {
      return document.documentElement;
    }

    var noOffsetParent = isIE(10) ? document.body : null;

    // NOTE: 1 DOM access here
    var offsetParent = element.offsetParent || null;
    // Skip hidden elements which don't have an offsetParent
    while (offsetParent === noOffsetParent && element.nextElementSibling) {
      offsetParent = (element = element.nextElementSibling).offsetParent;
    }

    var nodeName = offsetParent && offsetParent.nodeName;

    if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
      return element ? element.ownerDocument.documentElement : document.documentElement;
    }

    // .offsetParent will return the closest TH, TD or TABLE in case
    // no offsetParent is present, I hate this job...
    if (
      ['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 &&
      getStyleComputedProperty(offsetParent, 'position') === 'static'
    ) {
      return getOffsetParent(offsetParent);
    }

    return offsetParent;
  }

  function isOffsetContainer(element) {
    var nodeName = element.nodeName;
    if (nodeName === 'BODY') {
      return false;
    }
    return (
      nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element
    );
  }

  /**
   * Finds the root node (document, shadowDOM root) of the given element
   * @method
   * @memberof Popper.Utils
   * @argument {Element} node
   * @returns {Element} root node
   */
  function getRoot(node) {
    if (node.parentNode !== null) {
      return getRoot(node.parentNode);
    }

    return node;
  }

  /**
   * Finds the offset parent common to the two provided nodes
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element1
   * @argument {Element} element2
   * @returns {Element} common offset parent
   */
  function findCommonOffsetParent(element1, element2) {
    // This check is needed to avoid errors in case one of the elements isn't defined for any reason
    if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
      return document.documentElement;
    }

    // Here we make sure to give as "start" the element that comes first in the DOM
    var order =
      element1.compareDocumentPosition(element2) &
      Node.DOCUMENT_POSITION_FOLLOWING;
    var start = order ? element1 : element2;
    var end = order ? element2 : element1;

    // Get common ancestor container
    var range = document.createRange();
    range.setStart(start, 0);
    range.setEnd(end, 0);
    var commonAncestorContainer = range.commonAncestorContainer;

    // Both nodes are inside #document
    if (
      (element1 !== commonAncestorContainer &&
        element2 !== commonAncestorContainer) ||
      start.contains(end)
    ) {
      if (isOffsetContainer(commonAncestorContainer)) {
        return commonAncestorContainer;
      }

      return getOffsetParent(commonAncestorContainer);
    }

    // one of the nodes is inside shadowDOM, find which one
    var element1root = getRoot(element1);
    if (element1root.host) {
      return findCommonOffsetParent(element1root.host, element2);
    } else {
      return findCommonOffsetParent(element1, getRoot(element2).host);
    }
  }

  /**
   * Gets the scroll value of the given element in the given side (top and left)
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @argument {String} side `top` or `left`
   * @returns {number} amount of scrolled pixels
   */
  function getScroll(element, side) {
    if ( side === void 0 ) side = 'top';

    var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
    var nodeName = element.nodeName;

    if (nodeName === 'BODY' || nodeName === 'HTML') {
      var html = element.ownerDocument.documentElement;
      var scrollingElement = element.ownerDocument.scrollingElement || html;
      return scrollingElement[upperSide];
    }

    return element[upperSide];
  }

  /*
   * Sum or subtract the element scroll values (left and top) from a given rect object
   * @method
   * @memberof Popper.Utils
   * @param {Object} rect - Rect object you want to change
   * @param {HTMLElement} element - The element from the function reads the scroll values
   * @param {Boolean} subtract - set to true if you want to subtract the scroll values
   * @return {Object} rect - The modifier rect object
   */
  function includeScroll(rect, element, subtract) {
    if ( subtract === void 0 ) subtract = false;

    var scrollTop = getScroll(element, 'top');
    var scrollLeft = getScroll(element, 'left');
    var modifier = subtract ? -1 : 1;
    rect.top += scrollTop * modifier;
    rect.bottom += scrollTop * modifier;
    rect.left += scrollLeft * modifier;
    rect.right += scrollLeft * modifier;
    return rect;
  }

  /*
   * Helper to detect borders of a given element
   * @method
   * @memberof Popper.Utils
   * @param {CSSStyleDeclaration} styles
   * Result of `getStyleComputedProperty` on the given element
   * @param {String} axis - `x` or `y`
   * @return {number} borders - The borders size of the given axis
   */

  function getBordersSize(styles, axis) {
    var sideA = axis === 'x' ? 'Left' : 'Top';
    var sideB = sideA === 'Left' ? 'Right' : 'Bottom';

    return (
      parseFloat(styles[("border" + sideA + "Width")]) +
      parseFloat(styles[("border" + sideB + "Width")])
    );
  }

  function getSize(axis, body, html, computedStyle) {
    return Math.max(
      body[("offset" + axis)],
      body[("scroll" + axis)],
      html[("client" + axis)],
      html[("offset" + axis)],
      html[("scroll" + axis)],
      isIE(10)
        ? (parseInt(html[("offset" + axis)]) + 
        parseInt(computedStyle[("margin" + (axis === 'Height' ? 'Top' : 'Left'))]) + 
        parseInt(computedStyle[("margin" + (axis === 'Height' ? 'Bottom' : 'Right'))]))
      : 0 
    );
  }

  function getWindowSizes(document) {
    var body = document.body;
    var html = document.documentElement;
    var computedStyle = isIE(10) && getComputedStyle(html);

    return {
      height: getSize('Height', body, html, computedStyle),
      width: getSize('Width', body, html, computedStyle),
    };
  }

  /**
   * Given element offsets, generate an output similar to getBoundingClientRect
   * @method
   * @memberof Popper.Utils
   * @argument {Object} offsets
   * @returns {Object} ClientRect like output
   */
  function getClientRect(offsets) {
    return Object.assign({}, offsets,
      {right: offsets.left + offsets.width,
      bottom: offsets.top + offsets.height});
  }

  /**
   * Get bounding client rect of given element
   * @method
   * @memberof Popper.Utils
   * @param {HTMLElement} element
   * @return {Object} client rect
   */
  function getBoundingClientRect(element) {
    var rect = {};

    // IE10 10 FIX: Please, don't ask, the element isn't
    // considered in DOM in some circumstances...
    // This isn't reproducible in IE10 compatibility mode of IE11
    try {
      if (isIE(10)) {
        rect = element.getBoundingClientRect();
        var scrollTop = getScroll(element, 'top');
        var scrollLeft = getScroll(element, 'left');
        rect.top += scrollTop;
        rect.left += scrollLeft;
        rect.bottom += scrollTop;
        rect.right += scrollLeft;
      }
      else {
        rect = element.getBoundingClientRect();
      }
    }
    catch(e){}

    var result = {
      left: rect.left,
      top: rect.top,
      width: rect.right - rect.left,
      height: rect.bottom - rect.top,
    };

    // subtract scrollbar size from sizes
    var sizes = element.nodeName === 'HTML' ? getWindowSizes(element.ownerDocument) : {};
    var width =
      sizes.width || element.clientWidth || result.width;
    var height =
      sizes.height || element.clientHeight || result.height;

    var horizScrollbar = element.offsetWidth - width;
    var vertScrollbar = element.offsetHeight - height;

    // if an hypothetical scrollbar is detected, we must be sure it's not a `border`
    // we make this check conditional for performance reasons
    if (horizScrollbar || vertScrollbar) {
      var styles = getStyleComputedProperty(element);
      horizScrollbar -= getBordersSize(styles, 'x');
      vertScrollbar -= getBordersSize(styles, 'y');

      result.width -= horizScrollbar;
      result.height -= vertScrollbar;
    }

    return getClientRect(result);
  }

  function getOffsetRectRelativeToArbitraryNode(children, parent, fixedPosition) {
    if ( fixedPosition === void 0 ) fixedPosition = false;

    var isIE10 = isIE(10);
    var isHTML = parent.nodeName === 'HTML';
    var childrenRect = getBoundingClientRect(children);
    var parentRect = getBoundingClientRect(parent);
    var scrollParent = getScrollParent(children);

    var styles = getStyleComputedProperty(parent);
    var borderTopWidth = parseFloat(styles.borderTopWidth);
    var borderLeftWidth = parseFloat(styles.borderLeftWidth);

    // In cases where the parent is fixed, we must ignore negative scroll in offset calc
    if(fixedPosition && isHTML) {
      parentRect.top = Math.max(parentRect.top, 0);
      parentRect.left = Math.max(parentRect.left, 0);
    }
    var offsets = getClientRect({
      top: childrenRect.top - parentRect.top - borderTopWidth,
      left: childrenRect.left - parentRect.left - borderLeftWidth,
      width: childrenRect.width,
      height: childrenRect.height,
    });
    offsets.marginTop = 0;
    offsets.marginLeft = 0;

    // Subtract margins of documentElement in case it's being used as parent
    // we do this only on HTML because it's the only element that behaves
    // differently when margins are applied to it. The margins are included in
    // the box of the documentElement, in the other cases not.
    if (!isIE10 && isHTML) {
      var marginTop = parseFloat(styles.marginTop);
      var marginLeft = parseFloat(styles.marginLeft);

      offsets.top -= borderTopWidth - marginTop;
      offsets.bottom -= borderTopWidth - marginTop;
      offsets.left -= borderLeftWidth - marginLeft;
      offsets.right -= borderLeftWidth - marginLeft;

      // Attach marginTop and marginLeft because in some circumstances we may need them
      offsets.marginTop = marginTop;
      offsets.marginLeft = marginLeft;
    }

    if (
      isIE10 && !fixedPosition
        ? parent.contains(scrollParent)
        : parent === scrollParent && scrollParent.nodeName !== 'BODY'
    ) {
      offsets = includeScroll(offsets, parent);
    }

    return offsets;
  }

  function getViewportOffsetRectRelativeToArtbitraryNode(element, excludeScroll) {
    if ( excludeScroll === void 0 ) excludeScroll = false;

    var html = element.ownerDocument.documentElement;
    var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
    var width = Math.max(html.clientWidth, window.innerWidth || 0);
    var height = Math.max(html.clientHeight, window.innerHeight || 0);

    var scrollTop = !excludeScroll ? getScroll(html) : 0;
    var scrollLeft = !excludeScroll ? getScroll(html, 'left') : 0;

    var offset = {
      top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
      left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
      width: width,
      height: height,
    };

    return getClientRect(offset);
  }

  /**
   * Check if the given element is fixed or is inside a fixed parent
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @argument {Element} customContainer
   * @returns {Boolean} answer to "isFixed?"
   */
  function isFixed(element) {
    var nodeName = element.nodeName;
    if (nodeName === 'BODY' || nodeName === 'HTML') {
      return false;
    }
    if (getStyleComputedProperty(element, 'position') === 'fixed') {
      return true;
    }
    var parentNode = getParentNode(element);
    if (!parentNode) {
      return false;
    }
    return isFixed(parentNode);
  }

  /**
   * Finds the first parent of an element that has a transformed property defined
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @returns {Element} first transformed parent or documentElement
   */

  function getFixedPositionOffsetParent(element) {
    // This check is needed to avoid errors in case one of the elements isn't defined for any reason
     if (!element || !element.parentElement || isIE()) {
      return document.documentElement;
    }
    var el = element.parentElement;
    while (el && getStyleComputedProperty(el, 'transform') === 'none') {
      el = el.parentElement;
    }
    return el || document.documentElement;

  }

  /**
   * Computed the boundaries limits and return them
   * @method
   * @memberof Popper.Utils
   * @param {HTMLElement} popper
   * @param {HTMLElement} reference
   * @param {number} padding
   * @param {HTMLElement} boundariesElement - Element used to define the boundaries
   * @param {Boolean} fixedPosition - Is in fixed position mode
   * @returns {Object} Coordinates of the boundaries
   */
  function getBoundaries(
    popper,
    reference,
    padding,
    boundariesElement,
    fixedPosition
  ) {
    if ( fixedPosition === void 0 ) fixedPosition = false;

    // NOTE: 1 DOM access here

    var boundaries = { top: 0, left: 0 };
    var offsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, getReferenceNode(reference));

    // Handle viewport case
    if (boundariesElement === 'viewport' ) {
      boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent, fixedPosition);
    }

    else {
      // Handle other cases based on DOM element used as boundaries
      var boundariesNode;
      if (boundariesElement === 'scrollParent') {
        boundariesNode = getScrollParent(getParentNode(reference));
        if (boundariesNode.nodeName === 'BODY') {
          boundariesNode = popper.ownerDocument.documentElement;
        }
      } else if (boundariesElement === 'window') {
        boundariesNode = popper.ownerDocument.documentElement;
      } else {
        boundariesNode = boundariesElement;
      }

      var offsets = getOffsetRectRelativeToArbitraryNode(
        boundariesNode,
        offsetParent,
        fixedPosition
      );

      // In case of HTML, we need a different computation
      if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
        var ref = getWindowSizes(popper.ownerDocument);
        var height = ref.height;
        var width = ref.width;
        boundaries.top += offsets.top - offsets.marginTop;
        boundaries.bottom = height + offsets.top;
        boundaries.left += offsets.left - offsets.marginLeft;
        boundaries.right = width + offsets.left;
      } else {
        // for all the other DOM elements, this one is good
        boundaries = offsets;
      }
    }

    // Add paddings
    padding = padding || 0;
    var isPaddingNumber = typeof padding === 'number';
    boundaries.left += isPaddingNumber ? padding : padding.left || 0; 
    boundaries.top += isPaddingNumber ? padding : padding.top || 0; 
    boundaries.right -= isPaddingNumber ? padding : padding.right || 0; 
    boundaries.bottom -= isPaddingNumber ? padding : padding.bottom || 0; 

    return boundaries;
  }

  function getArea(ref) {
    var width = ref.width;
    var height = ref.height;

    return width * height;
  }

  /**
   * Utility used to transform the `auto` placement to the placement with more
   * available space.
   * @method
   * @memberof Popper.Utils
   * @argument {Object} data - The data object generated by update method
   * @argument {Object} options - Modifiers configuration and options
   * @returns {Object} The data object, properly modified
   */
  function computeAutoPlacement(
    placement,
    refRect,
    popper,
    reference,
    boundariesElement,
    padding
  ) {
    if ( padding === void 0 ) padding = 0;

    if (placement.indexOf('auto') === -1) {
      return placement;
    }

    var boundaries = getBoundaries(
      popper,
      reference,
      padding,
      boundariesElement
    );

    var rects = {
      top: {
        width: boundaries.width,
        height: refRect.top - boundaries.top,
      },
      right: {
        width: boundaries.right - refRect.right,
        height: boundaries.height,
      },
      bottom: {
        width: boundaries.width,
        height: boundaries.bottom - refRect.bottom,
      },
      left: {
        width: refRect.left - boundaries.left,
        height: boundaries.height,
      },
    };

    var sortedAreas = Object.keys(rects)
      .map(function (key) { return (Object.assign({}, {key: key},
        rects[key],
        {area: getArea(rects[key])})); })
      .sort(function (a, b) { return b.area - a.area; });

    var filteredAreas = sortedAreas.filter(
      function (ref) {
          var width = ref.width;
          var height = ref.height;

          return width >= popper.clientWidth && height >= popper.clientHeight;
    }
    );

    var computedPlacement = filteredAreas.length > 0
      ? filteredAreas[0].key
      : sortedAreas[0].key;

    var variation = placement.split('-')[1];

    return computedPlacement + (variation ? ("-" + variation) : '');
  }

  var timeoutDuration = (function(){
    var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
    for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
      if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
        return 1;
      }
    }
    return 0;
  }());

  function microtaskDebounce(fn) {
    var called = false;
    return function () {
      if (called) {
        return
      }
      called = true;
      window.Promise.resolve().then(function () {
        called = false;
        fn();
      });
    }
  }

  function taskDebounce(fn) {
    var scheduled = false;
    return function () {
      if (!scheduled) {
        scheduled = true;
        setTimeout(function () {
          scheduled = false;
          fn();
        }, timeoutDuration);
      }
    };
  }

  var supportsMicroTasks = isBrowser && window.Promise;


  /**
  * Create a debounced version of a method, that's asynchronously deferred
  * but called in the minimum time possible.
  *
  * @method
  * @memberof Popper.Utils
  * @argument {Function} fn
  * @returns {Function}
  */
  var debounce = (supportsMicroTasks
    ? microtaskDebounce
    : taskDebounce);

  /**
   * Mimics the `find` method of Array
   * @method
   * @memberof Popper.Utils
   * @argument {Array} arr
   * @argument prop
   * @argument value
   * @returns index or -1
   */
  function find(arr, check) {
    // use native find if supported
    if (Array.prototype.find) {
      return arr.find(check);
    }

    // use `filter` to obtain the same behavior of `find`
    return arr.filter(check)[0];
  }

  /**
   * Return the index of the matching object
   * @method
   * @memberof Popper.Utils
   * @argument {Array} arr
   * @argument prop
   * @argument value
   * @returns index or -1
   */
  function findIndex(arr, prop, value) {
    // use native findIndex if supported
    if (Array.prototype.findIndex) {
      return arr.findIndex(function (cur) { return cur[prop] === value; });
    }

    // use `find` + `indexOf` if `findIndex` isn't supported
    var match = find(arr, function (obj) { return obj[prop] === value; });
    return arr.indexOf(match);
  }

  /**
   * Get the position of the given element, relative to its offset parent
   * @method
   * @memberof Popper.Utils
   * @param {Element} element
   * @return {Object} position - Coordinates of the element and its `scrollTop`
   */
  function getOffsetRect(element) {
    var elementRect;
    if (element.nodeName === 'HTML') {
      var ref = getWindowSizes(element.ownerDocument);
      var width = ref.width;
      var height = ref.height;
      elementRect = {
        width: width,
        height: height,
        left: 0,
        top: 0,
      };
    } else {
      elementRect = {
        width: element.offsetWidth,
        height: element.offsetHeight,
        left: element.offsetLeft,
        top: element.offsetTop,
      };
    }

    // position
    return getClientRect(elementRect);
  }

  /**
   * Get the outer sizes of the given element (offset size + margins)
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element
   * @returns {Object} object containing width and height properties
   */
  function getOuterSizes(element) {
    var window = element.ownerDocument.defaultView;
    var styles = window.getComputedStyle(element);
    var x = parseFloat(styles.marginTop || 0) + parseFloat(styles.marginBottom || 0);
    var y = parseFloat(styles.marginLeft || 0) + parseFloat(styles.marginRight || 0);
    var result = {
      width: element.offsetWidth + y,
      height: element.offsetHeight + x,
    };
    return result;
  }

  /**
   * Get the opposite placement of the given one
   * @method
   * @memberof Popper.Utils
   * @argument {String} placement
   * @returns {String} flipped placement
   */
  function getOppositePlacement(placement) {
    var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
    return placement.replace(/left|right|bottom|top/g, function (matched) { return hash[matched]; });
  }

  /**
   * Get offsets to the popper
   * @method
   * @memberof Popper.Utils
   * @param {Object} position - CSS position the Popper will get applied
   * @param {HTMLElement} popper - the popper element
   * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
   * @param {String} placement - one of the valid placement options
   * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
   */
  function getPopperOffsets(popper, referenceOffsets, placement) {
    placement = placement.split('-')[0];

    // Get popper node sizes
    var popperRect = getOuterSizes(popper);

    // Add position, width and height to our offsets object
    var popperOffsets = {
      width: popperRect.width,
      height: popperRect.height,
    };

    // depending by the popper placement we have to compute its offsets slightly differently
    var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
    var mainSide = isHoriz ? 'top' : 'left';
    var secondarySide = isHoriz ? 'left' : 'top';
    var measurement = isHoriz ? 'height' : 'width';
    var secondaryMeasurement = !isHoriz ? 'height' : 'width';

    popperOffsets[mainSide] =
      referenceOffsets[mainSide] +
      referenceOffsets[measurement] / 2 -
      popperRect[measurement] / 2;
    if (placement === secondarySide) {
      popperOffsets[secondarySide] =
        referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
    } else {
      popperOffsets[secondarySide] =
        referenceOffsets[getOppositePlacement(secondarySide)];
    }

    return popperOffsets;
  }

  /**
   * Get offsets to the reference element
   * @method
   * @memberof Popper.Utils
   * @param {Object} state
   * @param {Element} popper - the popper element
   * @param {Element} reference - the reference element (the popper will be relative to this)
   * @param {Element} fixedPosition - is in fixed position mode
   * @returns {Object} An object containing the offsets which will be applied to the popper
   */
  function getReferenceOffsets(state, popper, reference, fixedPosition) {
    if ( fixedPosition === void 0 ) fixedPosition = null;

    var commonOffsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, getReferenceNode(reference));
    return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent, fixedPosition);
  }

  /**
   * Get the prefixed supported property name
   * @method
   * @memberof Popper.Utils
   * @argument {String} property (camelCase)
   * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
   */
  function getSupportedPropertyName(property) {
    var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
    var upperProp = property.charAt(0).toUpperCase() + property.slice(1);

    for (var i = 0; i < prefixes.length; i++) {
      var prefix = prefixes[i];
      var toCheck = prefix ? ("" + prefix + upperProp) : property;
      if (typeof document.body.style[toCheck] !== 'undefined') {
        return toCheck;
      }
    }
    return null;
  }

  /**
   * Check if the given variable is a function
   * @method
   * @memberof Popper.Utils
   * @argument {Any} functionToCheck - variable to check
   * @returns {Boolean} answer to: is a function?
   */
  function isFunction(functionToCheck) {
    var getType = {};
    return (
      functionToCheck &&
      getType.toString.call(functionToCheck) === '[object Function]'
    );
  }

  /**
   * Helper used to know if the given modifier is enabled.
   * @method
   * @memberof Popper.Utils
   * @returns {Boolean}
   */
  function isModifierEnabled(modifiers, modifierName) {
    return modifiers.some(
      function (ref) {
        var name = ref.name;
        var enabled = ref.enabled;

        return enabled && name === modifierName;
    }
    );
  }

  /**
   * Helper used to know if the given modifier depends from another one.<br />
   * It checks if the needed modifier is listed and enabled.
   * @method
   * @memberof Popper.Utils
   * @param {Array} modifiers - list of modifiers
   * @param {String} requestingName - name of requesting modifier
   * @param {String} requestedName - name of requested modifier
   * @returns {Boolean}
   */
  function isModifierRequired(
    modifiers,
    requestingName,
    requestedName
  ) {
    var requesting = find(modifiers, function (ref) {
      var name = ref.name;

      return name === requestingName;
    });

    var isRequired =
      !!requesting &&
      modifiers.some(function (modifier) {
        return (
          modifier.name === requestedName &&
          modifier.enabled &&
          modifier.order < requesting.order
        );
      });

    if (!isRequired) {
      var requesting$1 = "`" + requestingName + "`";
      var requested = "`" + requestedName + "`";
      console.warn(
        (requested + " modifier is required by " + requesting$1 + " modifier in order to work, be sure to include it before " + requesting$1 + "!")
      );
    }
    return isRequired;
  }

  /**
   * Tells if a given input is a number
   * @method
   * @memberof Popper.Utils
   * @param {*} input to check
   * @return {Boolean}
   */
  function isNumeric(n) {
    return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
  }

  /**
   * Get the window associated with the element
   * @argument {Element} element
   * @returns {Window}
   */
  function getWindow(element) {
    var ownerDocument = element.ownerDocument;
    return ownerDocument ? ownerDocument.defaultView : window;
  }

  /**
   * Remove event listeners used to update the popper position
   * @method
   * @memberof Popper.Utils
   * @private
   */
  function removeEventListeners(reference, state) {
    // Remove resize event listener on window
    getWindow(reference).removeEventListener('resize', state.updateBound);

    // Remove scroll event listener on scroll parents
    state.scrollParents.forEach(function (target) {
      target.removeEventListener('scroll', state.updateBound);
    });

    // Reset state
    state.updateBound = null;
    state.scrollParents = [];
    state.scrollElement = null;
    state.eventsEnabled = false;
    return state;
  }

  /**
   * Loop trough the list of modifiers and run them in order,
   * each of them will then edit the data object.
   * @method
   * @memberof Popper.Utils
   * @param {dataObject} data
   * @param {Array} modifiers
   * @param {String} ends - Optional modifier name used as stopper
   * @returns {dataObject}
   */
  function runModifiers(modifiers, data, ends) {
    var modifiersToRun = ends === undefined
      ? modifiers
      : modifiers.slice(0, findIndex(modifiers, 'name', ends));

    modifiersToRun.forEach(function (modifier) {
      if (modifier['function']) { // eslint-disable-line dot-notation
        console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
      }
      var fn = modifier['function'] || modifier.fn; // eslint-disable-line dot-notation
      if (modifier.enabled && isFunction(fn)) {
        // Add properties to offsets to make them a complete clientRect object
        // we do this before each modifier to make sure the previous one doesn't
        // mess with these values
        data.offsets.popper = getClientRect(data.offsets.popper);
        data.offsets.reference = getClientRect(data.offsets.reference);

        data = fn(data, modifier);
      }
    });

    return data;
  }

  /**
   * Set the attributes to the given popper
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element - Element to apply the attributes to
   * @argument {Object} styles
   * Object with a list of properties and values which will be applied to the element
   */
  function setAttributes(element, attributes) {
    Object.keys(attributes).forEach(function(prop) {
      var value = attributes[prop];
      if (value !== false) {
        element.setAttribute(prop, attributes[prop]);
      } else {
        element.removeAttribute(prop);
      }
    });
  }

  /**
   * Set the style to the given popper
   * @method
   * @memberof Popper.Utils
   * @argument {Element} element - Element to apply the style to
   * @argument {Object} styles
   * Object with a list of properties and values which will be applied to the element
   */
  function setStyles(element, styles) {
    Object.keys(styles).forEach(function (prop) {
      var unit = '';
      // add unit if the value is numeric and is one of the following
      if (
        ['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !==
          -1 &&
        isNumeric(styles[prop])
      ) {
        unit = 'px';
      }
      element.style[prop] = styles[prop] + unit;
    });
  }

  function attachToScrollParents(scrollParent, event, callback, scrollParents) {
    var isBody = scrollParent.nodeName === 'BODY';
    var target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
    target.addEventListener(event, callback, { passive: true });

    if (!isBody) {
      attachToScrollParents(
        getScrollParent(target.parentNode),
        event,
        callback,
        scrollParents
      );
    }
    scrollParents.push(target);
  }

  /**
   * Setup needed event listeners used to update the popper position
   * @method
   * @memberof Popper.Utils
   * @private
   */
  function setupEventListeners(
    reference,
    options,
    state,
    updateBound
  ) {
    // Resize event listener on window
    state.updateBound = updateBound;
    getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });

    // Scroll event listener on scroll parents
    var scrollElement = getScrollParent(reference);
    attachToScrollParents(
      scrollElement,
      'scroll',
      state.updateBound,
      state.scrollParents
    );
    state.scrollElement = scrollElement;
    state.eventsEnabled = true;

    return state;
  }

  // This is here just for backward compatibility with versions lower than v1.10.3
  // you should import the utilities using named exports, if you want them all use:
  // ```
  // import * as PopperUtils from 'popper-utils';
  // ```
  // The default export will be removed in the next major version.
  var index = {
    computeAutoPlacement: computeAutoPlacement,
    debounce: debounce,
    findIndex: findIndex,
    getBordersSize: getBordersSize,
    getBoundaries: getBoundaries,
    getBoundingClientRect: getBoundingClientRect,
    getClientRect: getClientRect,
    getOffsetParent: getOffsetParent,
    getOffsetRect: getOffsetRect,
    getOffsetRectRelativeToArbitraryNode: getOffsetRectRelativeToArbitraryNode,
    getOuterSizes: getOuterSizes,
    getParentNode: getParentNode,
    getPopperOffsets: getPopperOffsets,
    getReferenceOffsets: getReferenceOffsets,
    getScroll: getScroll,
    getScrollParent: getScrollParent,
    getStyleComputedProperty: getStyleComputedProperty,
    getSupportedPropertyName: getSupportedPropertyName,
    getWindowSizes: getWindowSizes,
    isFixed: isFixed,
    isFunction: isFunction,
    isModifierEnabled: isModifierEnabled,
    isModifierRequired: isModifierRequired,
    isNumeric: isNumeric,
    removeEventListeners: removeEventListeners,
    runModifiers: runModifiers,
    setAttributes: setAttributes,
    setStyles: setStyles,
    setupEventListeners: setupEventListeners,
  };

  exports.computeAutoPlacement = computeAutoPlacement;
  exports.debounce = debounce;
  exports.default = index;
  exports.findIndex = findIndex;
  exports.getBordersSize = getBordersSize;
  exports.getBoundaries = getBoundaries;
  exports.getBoundingClientRect = getBoundingClientRect;
  exports.getClientRect = getClientRect;
  exports.getOffsetParent = getOffsetParent;
  exports.getOffsetRect = getOffsetRect;
  exports.getOffsetRectRelativeToArbitraryNode = getOffsetRectRelativeToArbitraryNode;
  exports.getOuterSizes = getOuterSizes;
  exports.getParentNode = getParentNode;
  exports.getPopperOffsets = getPopperOffsets;
  exports.getReferenceOffsets = getReferenceOffsets;
  exports.getScroll = getScroll;
  exports.getScrollParent = getScrollParent;
  exports.getStyleComputedProperty = getStyleComputedProperty;
  exports.getSupportedPropertyName = getSupportedPropertyName;
  exports.getWindowSizes = getWindowSizes;
  exports.isFixed = isFixed;
  exports.isFunction = isFunction;
  exports.isModifierEnabled = isModifierEnabled;
  exports.isModifierRequired = isModifierRequired;
  exports.isNumeric = isNumeric;
  exports.removeEventListeners = removeEventListeners;
  exports.runModifiers = runModifiers;
  exports.setAttributes = setAttributes;
  exports.setStyles = setStyles;
  exports.setupEventListeners = setupEventListeners;

  Object.defineProperty(exports, '__esModule', { value: true });

})));