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Edit File: popper-utils.js

/**
 * 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 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 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,
};

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