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/**!

 * @fileOverview Kickass library to create and place poppers near their reference elements.

 * @version 1.12.5

 * @license

 * Copyright (c) 2016 Federico Zivolo and contributors

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in all

 * copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 */

(function (global, factory) {

	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :

	typeof define === 'function' && define.amd ? define(factory) :

	(global.Popper = factory());

}(this, (function () { 'use strict';



var nativeHints = ['native code', '[object MutationObserverConstructor]'];



/**

 * Determine if a function is implemented natively (as opposed to a polyfill).

 * @method

 * @memberof Popper.Utils

 * @argument {Function | undefined} fn the function to check

 * @returns {Boolean}

 */

var isNative = (function (fn) {

  return nativeHints.some(function (hint) {

    return (fn || '').toString().indexOf(hint) > -1;

  });

});



var isBrowser = typeof window !== 'undefined';

var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];

var timeoutDuration = 0;

for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {

  if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {

    timeoutDuration = 1;

    break;

  }

}



function microtaskDebounce(fn) {

  var scheduled = false;

  var i = 0;

  var elem = document.createElement('span');



  // MutationObserver provides a mechanism for scheduling microtasks, which

  // are scheduled *before* the next task. This gives us a way to debounce

  // a function but ensure it's called *before* the next paint.

  var observer = new MutationObserver(function () {

    fn();

    scheduled = false;

  });



  observer.observe(elem, { attributes: true });



  return function () {

    if (!scheduled) {

      scheduled = true;

      elem.setAttribute('x-index', i);

      i = i + 1; // don't use compund (+=) because it doesn't get optimized in V8

    }

  };

}



function taskDebounce(fn) {

  var scheduled = false;

  return function () {

    if (!scheduled) {

      scheduled = true;

      setTimeout(function () {

        scheduled = false;

        fn();

      }, timeoutDuration);

    }

  };

}



// It's common for MutationObserver polyfills to be seen in the wild, however

// these rely on Mutation Events which only occur when an element is connected

// to the DOM. The algorithm used in this module does not use a connected element,

// and so we must ensure that a *native* MutationObserver is available.

var supportsNativeMutationObserver = isBrowser && isNative(window.MutationObserver);



/**

* 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 = supportsNativeMutationObserver ? microtaskDebounce : taskDebounce;



/**

 * 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]';

}



/**

 * 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 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 || ['HTML', 'BODY', '#document'].indexOf(element.nodeName) !== -1) {

    return window.document.body;

  }



  // Firefox want us to check `-x` and `-y` variations as well



  var _getStyleComputedProp = getStyleComputedProperty(element),

      overflow = _getStyleComputedProp.overflow,

      overflowX = _getStyleComputedProp.overflowX,

      overflowY = _getStyleComputedProp.overflowY;



  if (/(auto|scroll)/.test(overflow + overflowY + overflowX)) {

    return element;

  }



  return getScrollParent(getParentNode(element));

}



/**

 * Returns the offset parent of the given element

 * @method

 * @memberof Popper.Utils

 * @argument {Element} element

 * @returns {Element} offset parent

 */

function getOffsetParent(element) {

  // NOTE: 1 DOM access here

  var offsetParent = element && element.offsetParent;

  var nodeName = offsetParent && offsetParent.nodeName;



  if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {

    return window.document.documentElement;

  }



  // .offsetParent will return the closest TD or TABLE in case

  // no offsetParent is present, I hate this job...

  if (['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 window.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) {

  var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';



  var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';

  var nodeName = element.nodeName;



  if (nodeName === 'BODY' || nodeName === 'HTML') {

    var html = window.document.documentElement;

    var scrollingElement = window.document.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) {

  var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 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 +styles['border' + sideA + 'Width'].split('px')[0] + +styles['border' + sideB + 'Width'].split('px')[0];

}



/**

 * Tells if you are running Internet Explorer 10

 * @method

 * @memberof Popper.Utils

 * @returns {Boolean} isIE10

 */

var isIE10 = undefined;



var isIE10$1 = function () {

  if (isIE10 === undefined) {

    isIE10 = navigator.appVersion.indexOf('MSIE 10') !== -1;

  }

  return isIE10;

};



function getSize(axis, body, html, computedStyle) {

  return Math.max(body['offset' + axis], body['scroll' + axis], html['client' + axis], html['offset' + axis], html['scroll' + axis], isIE10$1() ? html['offset' + axis] + computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')] + computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')] : 0);

}



function getWindowSizes() {

  var body = window.document.body;

  var html = window.document.documentElement;

  var computedStyle = isIE10$1() && window.getComputedStyle(html);



  return {

    height: getSize('Height', body, html, computedStyle),

    width: getSize('Width', body, html, computedStyle)

  };

}



var classCallCheck = function (instance, Constructor) {

  if (!(instance instanceof Constructor)) {

    throw new TypeError("Cannot call a class as a function");

  }

};



var createClass = function () {

  function defineProperties(target, props) {

    for (var i = 0; i < props.length; i++) {

      var descriptor = props[i];

      descriptor.enumerable = descriptor.enumerable || false;

      descriptor.configurable = true;

      if ("value" in descriptor) descriptor.writable = true;

      Object.defineProperty(target, descriptor.key, descriptor);

    }

  }



  return function (Constructor, protoProps, staticProps) {

    if (protoProps) defineProperties(Constructor.prototype, protoProps);

    if (staticProps) defineProperties(Constructor, staticProps);

    return Constructor;

  };

}();











var defineProperty = function (obj, key, value) {

  if (key in obj) {

    Object.defineProperty(obj, key, {

      value: value,

      enumerable: true,

      configurable: true,

      writable: true

    });

  } else {

    obj[key] = value;

  }



  return obj;

};



var _extends = Object.assign || function (target) {

  for (var i = 1; i < arguments.length; i++) {

    var source = arguments[i];



    for (var key in source) {

      if (Object.prototype.hasOwnProperty.call(source, key)) {

        target[key] = source[key];

      }

    }

  }



  return target;

};



/**

 * 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 _extends({}, 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

  if (isIE10$1()) {

    try {

      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;

    } catch (err) {}

  } else {

    rect = element.getBoundingClientRect();

  }



  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() : {};

  var width = sizes.width || element.clientWidth || result.right - result.left;

  var height = sizes.height || element.clientHeight || result.bottom - result.top;



  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) {

  var isIE10 = isIE10$1();

  var isHTML = parent.nodeName === 'HTML';

  var childrenRect = getBoundingClientRect(children);

  var parentRect = getBoundingClientRect(parent);

  var scrollParent = getScrollParent(children);



  var styles = getStyleComputedProperty(parent);

  var borderTopWidth = +styles.borderTopWidth.split('px')[0];

  var borderLeftWidth = +styles.borderLeftWidth.split('px')[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 = +styles.marginTop.split('px')[0];

    var marginLeft = +styles.marginLeft.split('px')[0];



    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 ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {

    offsets = includeScroll(offsets, parent);

  }



  return offsets;

}



function getViewportOffsetRectRelativeToArtbitraryNode(element) {

  var html = window.document.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 = getScroll(html);

  var scrollLeft = getScroll(html, 'left');



  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;

  }

  return isFixed(getParentNode(element));

}



/**

 * 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

 * @returns {Object} Coordinates of the boundaries

 */

function getBoundaries(popper, reference, padding, boundariesElement) {

  // NOTE: 1 DOM access here

  var boundaries = { top: 0, left: 0 };

  var offsetParent = findCommonOffsetParent(popper, reference);



  // Handle viewport case

  if (boundariesElement === 'viewport') {

    boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent);

  } else {

    // Handle other cases based on DOM element used as boundaries

    var boundariesNode = void 0;

    if (boundariesElement === 'scrollParent') {

      boundariesNode = getScrollParent(getParentNode(popper));

      if (boundariesNode.nodeName === 'BODY') {

        boundariesNode = window.document.documentElement;

      }

    } else if (boundariesElement === 'window') {

      boundariesNode = window.document.documentElement;

    } else {

      boundariesNode = boundariesElement;

    }



    var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent);



    // In case of HTML, we need a different computation

    if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {

      var _getWindowSizes = getWindowSizes(),

          height = _getWindowSizes.height,

          width = _getWindowSizes.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

  boundaries.left += padding;

  boundaries.top += padding;

  boundaries.right -= padding;

  boundaries.bottom -= padding;



  return boundaries;

}



function getArea(_ref) {

  var width = _ref.width,

      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) {

  var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 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 _extends({

      key: key

    }, rects[key], {

      area: getArea(rects[key])

    });

  }).sort(function (a, b) {

    return b.area - a.area;

  });



  var filteredAreas = sortedAreas.filter(function (_ref2) {

    var width = _ref2.width,

        height = _ref2.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 : '');

}



/**

 * 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)

 * @returns {Object} An object containing the offsets which will be applied to the popper

 */

function getReferenceOffsets(state, popper, reference) {

  var commonOffsetParent = findCommonOffsetParent(popper, reference);

  return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent);

}



/**

 * 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 styles = window.getComputedStyle(element);

  var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);

  var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);

  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;

}



/**

 * 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);

}



/**

 * 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) {

      console.warn('`modifier.function` is deprecated, use `modifier.fn`!');

    }

    var fn = modifier.function || modifier.fn;

    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;

}



/**

 * Updates the position of the popper, computing the new offsets and applying

 * the new style.<br />

 * Prefer `scheduleUpdate` over `update` because of performance reasons.

 * @method

 * @memberof Popper

 */

function update() {

  // if popper is destroyed, don't perform any further update

  if (this.state.isDestroyed) {

    return;

  }



  var data = {

    instance: this,

    styles: {},

    arrowStyles: {},

    attributes: {},

    flipped: false,

    offsets: {}

  };



  // compute reference element offsets

  data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference);



  // compute auto placement, store placement inside the data object,

  // modifiers will be able to edit `placement` if needed

  // and refer to originalPlacement to know the original value

  data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);



  // store the computed placement inside `originalPlacement`

  data.originalPlacement = data.placement;



  // compute the popper offsets

  data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);

  data.offsets.popper.position = 'absolute';



  // run the modifiers

  data = runModifiers(this.modifiers, data);



  // the first `update` will call `onCreate` callback

  // the other ones will call `onUpdate` callback

  if (!this.state.isCreated) {

    this.state.isCreated = true;

    this.options.onCreate(data);

  } else {

    this.options.onUpdate(data);

  }

}



/**

 * 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,

        enabled = _ref.enabled;

    return enabled && name === modifierName;

  });

}



/**

 * 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 - 1; i++) {

    var prefix = prefixes[i];

    var toCheck = prefix ? '' + prefix + upperProp : property;

    if (typeof window.document.body.style[toCheck] !== 'undefined') {

      return toCheck;

    }

  }

  return null;

}



/**

 * Destroy the popper

 * @method

 * @memberof Popper

 */

function destroy() {

  this.state.isDestroyed = true;



  // touch DOM only if `applyStyle` modifier is enabled

  if (isModifierEnabled(this.modifiers, 'applyStyle')) {

    this.popper.removeAttribute('x-placement');

    this.popper.style.left = '';

    this.popper.style.position = '';

    this.popper.style.top = '';

    this.popper.style[getSupportedPropertyName('transform')] = '';

  }



  this.disableEventListeners();



  // remove the popper if user explicity asked for the deletion on destroy

  // do not use `remove` because IE11 doesn't support it

  if (this.options.removeOnDestroy) {

    this.popper.parentNode.removeChild(this.popper);

  }

  return this;

}



function attachToScrollParents(scrollParent, event, callback, scrollParents) {

  var isBody = scrollParent.nodeName === 'BODY';

  var target = isBody ? window : 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;

  window.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;

}



/**

 * It will add resize/scroll events and start recalculating

 * position of the popper element when they are triggered.

 * @method

 * @memberof Popper

 */

function enableEventListeners() {

  if (!this.state.eventsEnabled) {

    this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);

  }

}



/**

 * Remove event listeners used to update the popper position

 * @method

 * @memberof Popper.Utils

 * @private

 */

function removeEventListeners(reference, state) {

  // Remove resize event listener on window

  window.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;

}



/**

 * It will remove resize/scroll events and won't recalculate popper position

 * when they are triggered. It also won't trigger onUpdate callback anymore,

 * unless you call `update` method manually.

 * @method

 * @memberof Popper

 */

function disableEventListeners() {

  if (this.state.eventsEnabled) {

    window.cancelAnimationFrame(this.scheduleUpdate);

    this.state = removeEventListeners(this.reference, this.state);

  }

}



/**

 * 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);

}



/**

 * 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;

  });

}



/**

 * 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);

    }

  });

}



/**

 * @function

 * @memberof Modifiers

 * @argument {Object} data - The data object generated by `update` method

 * @argument {Object} data.styles - List of style properties - values to apply to popper element

 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element

 * @argument {Object} options - Modifiers configuration and options

 * @returns {Object} The same data object

 */

function applyStyle(data) {

  // any property present in `data.styles` will be applied to the popper,

  // in this way we can make the 3rd party modifiers add custom styles to it

  // Be aware, modifiers could override the properties defined in the previous

  // lines of this modifier!

  setStyles(data.instance.popper, data.styles);



  // any property present in `data.attributes` will be applied to the popper,

  // they will be set as HTML attributes of the element

  setAttributes(data.instance.popper, data.attributes);



  // if arrowElement is defined and arrowStyles has some properties

  if (data.arrowElement && Object.keys(data.arrowStyles).length) {

    setStyles(data.arrowElement, data.arrowStyles);

  }



  return data;

}



/**

 * Set the x-placement attribute before everything else because it could be used

 * to add margins to the popper margins needs to be calculated to get the

 * correct popper offsets.

 * @method

 * @memberof Popper.modifiers

 * @param {HTMLElement} reference - The reference element used to position the popper

 * @param {HTMLElement} popper - The HTML element used as popper.

 * @param {Object} options - Popper.js options

 */

function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {

  // compute reference element offsets

  var referenceOffsets = getReferenceOffsets(state, popper, reference);



  // compute auto placement, store placement inside the data object,

  // modifiers will be able to edit `placement` if needed

  // and refer to originalPlacement to know the original value

  var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);



  popper.setAttribute('x-placement', placement);



  // Apply `position` to popper before anything else because

  // without the position applied we can't guarantee correct computations

  setStyles(popper, { position: 'absolute' });



  return options;

}



/**

 * @function

 * @memberof Modifiers

 * @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 computeStyle(data, options) {

  var x = options.x,

      y = options.y;

  var popper = data.offsets.popper;



  // Remove this legacy support in Popper.js v2



  var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {

    return modifier.name === 'applyStyle';

  }).gpuAcceleration;

  if (legacyGpuAccelerationOption !== undefined) {

    console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');

  }

  var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;



  var offsetParent = getOffsetParent(data.instance.popper);

  var offsetParentRect = getBoundingClientRect(offsetParent);



  // Styles

  var styles = {

    position: popper.position

  };



  // floor sides to avoid blurry text

  var offsets = {

    left: Math.floor(popper.left),

    top: Math.floor(popper.top),

    bottom: Math.floor(popper.bottom),

    right: Math.floor(popper.right)

  };



  var sideA = x === 'bottom' ? 'top' : 'bottom';

  var sideB = y === 'right' ? 'left' : 'right';



  // if gpuAcceleration is set to `true` and transform is supported,

  //  we use `translate3d` to apply the position to the popper we

  // automatically use the supported prefixed version if needed

  var prefixedProperty = getSupportedPropertyName('transform');



  // now, let's make a step back and look at this code closely (wtf?)

  // If the content of the popper grows once it's been positioned, it

  // may happen that the popper gets misplaced because of the new content

  // overflowing its reference element

  // To avoid this problem, we provide two options (x and y), which allow

  // the consumer to define the offset origin.

  // If we position a popper on top of a reference element, we can set

  // `x` to `top` to make the popper grow towards its top instead of

  // its bottom.

  var left = void 0,

      top = void 0;

  if (sideA === 'bottom') {

    top = -offsetParentRect.height + offsets.bottom;

  } else {

    top = offsets.top;

  }

  if (sideB === 'right') {

    left = -offsetParentRect.width + offsets.right;

  } else {

    left = offsets.left;

  }

  if (gpuAcceleration && prefixedProperty) {

    styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';

    styles[sideA] = 0;

    styles[sideB] = 0;

    styles.willChange = 'transform';

  } else {

    // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties

    var invertTop = sideA === 'bottom' ? -1 : 1;

    var invertLeft = sideB === 'right' ? -1 : 1;

    styles[sideA] = top * invertTop;

    styles[sideB] = left * invertLeft;

    styles.willChange = sideA + ', ' + sideB;

  }



  // Attributes

  var attributes = {

    'x-placement': data.placement

  };



  // Update `data` attributes, styles and arrowStyles

  data.attributes = _extends({}, attributes, data.attributes);

  data.styles = _extends({}, styles, data.styles);

  data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);



  return data;

}



/**

 * 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 = '`' + requestingName + '`';

    var requested = '`' + requestedName + '`';

    console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');

  }

  return isRequired;

}



/**

 * @function

 * @memberof Modifiers

 * @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 arrow(data, options) {

  // arrow depends on keepTogether in order to work

  if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {

    return data;

  }



  var arrowElement = options.element;



  // if arrowElement is a string, suppose it's a CSS selector

  if (typeof arrowElement === 'string') {

    arrowElement = data.instance.popper.querySelector(arrowElement);



    // if arrowElement is not found, don't run the modifier

    if (!arrowElement) {

      return data;

    }

  } else {

    // if the arrowElement isn't a query selector we must check that the

    // provided DOM node is child of its popper node

    if (!data.instance.popper.contains(arrowElement)) {

      console.warn('WARNING: `arrow.element` must be child of its popper element!');

      return data;

    }

  }



  var placement = data.placement.split('-')[0];

  var _data$offsets = data.offsets,

      popper = _data$offsets.popper,

      reference = _data$offsets.reference;



  var isVertical = ['left', 'right'].indexOf(placement) !== -1;



  var len = isVertical ? 'height' : 'width';

  var sideCapitalized = isVertical ? 'Top' : 'Left';

  var side = sideCapitalized.toLowerCase();

  var altSide = isVertical ? 'left' : 'top';

  var opSide = isVertical ? 'bottom' : 'right';

  var arrowElementSize = getOuterSizes(arrowElement)[len];



  //

  // extends keepTogether behavior making sure the popper and its

  // reference have enough pixels in conjuction

  //



  // top/left side

  if (reference[opSide] - arrowElementSize < popper[side]) {

    data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);

  }

  // bottom/right side

  if (reference[side] + arrowElementSize > popper[opSide]) {

    data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];

  }



  // compute center of the popper

  var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;



  // Compute the sideValue using the updated popper offsets

  // take popper margin in account because we don't have this info available

  var popperMarginSide = getStyleComputedProperty(data.instance.popper, 'margin' + sideCapitalized).replace('px', '');

  var sideValue = center - getClientRect(data.offsets.popper)[side] - popperMarginSide;



  // prevent arrowElement from being placed not contiguously to its popper

  sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);



  data.arrowElement = arrowElement;

  data.offsets.arrow = {};

  data.offsets.arrow[side] = Math.round(sideValue);

  data.offsets.arrow[altSide] = ''; // make sure to unset any eventual altSide value from the DOM node



  return data;

}



/**

 * Get the opposite placement variation of the given one

 * @method

 * @memberof Popper.Utils

 * @argument {String} placement variation

 * @returns {String} flipped placement variation

 */

function getOppositeVariation(variation) {

  if (variation === 'end') {

    return 'start';

  } else if (variation === 'start') {

    return 'end';

  }

  return variation;

}



/**

 * List of accepted placements to use as values of the `placement` option.<br />

 * Valid placements are:

 * - `auto`

 * - `top`

 * - `right`

 * - `bottom`

 * - `left`

 *

 * Each placement can have a variation from this list:

 * - `-start`

 * - `-end`

 *

 * Variations are interpreted easily if you think of them as the left to right

 * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`

 * is right.<br />

 * Vertically (`left` and `right`), `start` is top and `end` is bottom.

 *

 * Some valid examples are:

 * - `top-end` (on top of reference, right aligned)

 * - `right-start` (on right of reference, top aligned)

 * - `bottom` (on bottom, centered)

 * - `auto-right` (on the side with more space available, alignment depends by placement)

 *

 * @static

 * @type {Array}

 * @enum {String}

 * @readonly

 * @method placements

 * @memberof Popper

 */

var placements = ['auto-start', 'auto', 'auto-end', 'top-start', 'top', 'top-end', 'right-start', 'right', 'right-end', 'bottom-end', 'bottom', 'bottom-start', 'left-end', 'left', 'left-start'];



// Get rid of `auto` `auto-start` and `auto-end`

var validPlacements = placements.slice(3);



/**

 * Given an initial placement, returns all the subsequent placements

 * clockwise (or counter-clockwise).

 *

 * @method

 * @memberof Popper.Utils

 * @argument {String} placement - A valid placement (it accepts variations)

 * @argument {Boolean} counter - Set to true to walk the placements counterclockwise

 * @returns {Array} placements including their variations

 */

function clockwise(placement) {

  var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;



  var index = validPlacements.indexOf(placement);

  var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));

  return counter ? arr.reverse() : arr;

}



var BEHAVIORS = {

  FLIP: 'flip',

  CLOCKWISE: 'clockwise',

  COUNTERCLOCKWISE: 'counterclockwise'

};



/**

 * @function

 * @memberof Modifiers

 * @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 flip(data, options) {

  // if `inner` modifier is enabled, we can't use the `flip` modifier

  if (isModifierEnabled(data.instance.modifiers, 'inner')) {

    return data;

  }



  if (data.flipped && data.placement === data.originalPlacement) {

    // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides

    return data;

  }



  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement);



  var placement = data.placement.split('-')[0];

  var placementOpposite = getOppositePlacement(placement);

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



  var flipOrder = [];



  switch (options.behavior) {

    case BEHAVIORS.FLIP:

      flipOrder = [placement, placementOpposite];

      break;

    case BEHAVIORS.CLOCKWISE:

      flipOrder = clockwise(placement);

      break;

    case BEHAVIORS.COUNTERCLOCKWISE:

      flipOrder = clockwise(placement, true);

      break;

    default:

      flipOrder = options.behavior;

  }



  flipOrder.forEach(function (step, index) {

    if (placement !== step || flipOrder.length === index + 1) {

      return data;

    }



    placement = data.placement.split('-')[0];

    placementOpposite = getOppositePlacement(placement);



    var popperOffsets = data.offsets.popper;

    var refOffsets = data.offsets.reference;



    // using floor because the reference offsets may contain decimals we are not going to consider here

    var floor = Math.floor;

    var overlapsRef = placement === 'left' && floor(popperOffsets.right) > floor(refOffsets.left) || placement === 'right' && floor(popperOffsets.left) < floor(refOffsets.right) || placement === 'top' && floor(popperOffsets.bottom) > floor(refOffsets.top) || placement === 'bottom' && floor(popperOffsets.top) < floor(refOffsets.bottom);



    var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);

    var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);

    var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);

    var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);



    var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;



    // flip the variation if required

    var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;

    var flippedVariation = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);



    if (overlapsRef || overflowsBoundaries || flippedVariation) {

      // this boolean to detect any flip loop

      data.flipped = true;



      if (overlapsRef || overflowsBoundaries) {

        placement = flipOrder[index + 1];

      }



      if (flippedVariation) {

        variation = getOppositeVariation(variation);

      }



      data.placement = placement + (variation ? '-' + variation : '');



      // this object contains `position`, we want to preserve it along with

      // any additional property we may add in the future

      data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));



      data = runModifiers(data.instance.modifiers, data, 'flip');

    }

  });

  return data;

}



/**

 * @function

 * @memberof Modifiers

 * @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 keepTogether(data) {

  var _data$offsets = data.offsets,

      popper = _data$offsets.popper,

      reference = _data$offsets.reference;



  var placement = data.placement.split('-')[0];

  var floor = Math.floor;

  var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;

  var side = isVertical ? 'right' : 'bottom';

  var opSide = isVertical ? 'left' : 'top';

  var measurement = isVertical ? 'width' : 'height';



  if (popper[side] < floor(reference[opSide])) {

    data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];

  }

  if (popper[opSide] > floor(reference[side])) {

    data.offsets.popper[opSide] = floor(reference[side]);

  }



  return data;

}



/**

 * Converts a string containing value + unit into a px value number

 * @function

 * @memberof {modifiers~offset}

 * @private

 * @argument {String} str - Value + unit string

 * @argument {String} measurement - `height` or `width`

 * @argument {Object} popperOffsets

 * @argument {Object} referenceOffsets

 * @returns {Number|String}

 * Value in pixels, or original string if no values were extracted

 */

function toValue(str, measurement, popperOffsets, referenceOffsets) {

  // separate value from unit

  var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);

  var value = +split[1];

  var unit = split[2];



  // If it's not a number it's an operator, I guess

  if (!value) {

    return str;

  }



  if (unit.indexOf('%') === 0) {

    var element = void 0;

    switch (unit) {

      case '%p':

        element = popperOffsets;

        break;

      case '%':

      case '%r':

      default:

        element = referenceOffsets;

    }



    var rect = getClientRect(element);

    return rect[measurement] / 100 * value;

  } else if (unit === 'vh' || unit === 'vw') {

    // if is a vh or vw, we calculate the size based on the viewport

    var size = void 0;

    if (unit === 'vh') {

      size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);

    } else {

      size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);

    }

    return size / 100 * value;

  } else {

    // if is an explicit pixel unit, we get rid of the unit and keep the value

    // if is an implicit unit, it's px, and we return just the value

    return value;

  }

}



/**

 * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.

 * @function

 * @memberof {modifiers~offset}

 * @private

 * @argument {String} offset

 * @argument {Object} popperOffsets

 * @argument {Object} referenceOffsets

 * @argument {String} basePlacement

 * @returns {Array} a two cells array with x and y offsets in numbers

 */

function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {

  var offsets = [0, 0];



  // Use height if placement is left or right and index is 0 otherwise use width

  // in this way the first offset will use an axis and the second one

  // will use the other one

  var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;



  // Split the offset string to obtain a list of values and operands

  // The regex addresses values with the plus or minus sign in front (+10, -20, etc)

  var fragments = offset.split(/(\+|\-)/).map(function (frag) {

    return frag.trim();

  });



  // Detect if the offset string contains a pair of values or a single one

  // they could be separated by comma or space

  var divider = fragments.indexOf(find(fragments, function (frag) {

    return frag.search(/,|\s/) !== -1;

  }));



  if (fragments[divider] && fragments[divider].indexOf(',') === -1) {

    console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');

  }



  // If divider is found, we divide the list of values and operands to divide

  // them by ofset X and Y.

  var splitRegex = /\s*,\s*|\s+/;

  var ops = divider !== -1 ? [fragments.slice(0, divider).concat([fragments[divider].split(splitRegex)[0]]), [fragments[divider].split(splitRegex)[1]].concat(fragments.slice(divider + 1))] : [fragments];



  // Convert the values with units to absolute pixels to allow our computations

  ops = ops.map(function (op, index) {

    // Most of the units rely on the orientation of the popper

    var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';

    var mergeWithPrevious = false;

    return op

    // This aggregates any `+` or `-` sign that aren't considered operators

    // e.g.: 10 + +5 => [10, +, +5]

    .reduce(function (a, b) {

      if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {

        a[a.length - 1] = b;

        mergeWithPrevious = true;

        return a;

      } else if (mergeWithPrevious) {

        a[a.length - 1] += b;

        mergeWithPrevious = false;

        return a;

      } else {

        return a.concat(b);

      }

    }, [])

    // Here we convert the string values into number values (in px)

    .map(function (str) {

      return toValue(str, measurement, popperOffsets, referenceOffsets);

    });

  });



  // Loop trough the offsets arrays and execute the operations

  ops.forEach(function (op, index) {

    op.forEach(function (frag, index2) {

      if (isNumeric(frag)) {

        offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);

      }

    });

  });

  return offsets;

}



/**

 * @function

 * @memberof Modifiers

 * @argument {Object} data - The data object generated by update method

 * @argument {Object} options - Modifiers configuration and options

 * @argument {Number|String} options.offset=0

 * The offset value as described in the modifier description

 * @returns {Object} The data object, properly modified

 */

function offset(data, _ref) {

  var offset = _ref.offset;

  var placement = data.placement,

      _data$offsets = data.offsets,

      popper = _data$offsets.popper,

      reference = _data$offsets.reference;



  var basePlacement = placement.split('-')[0];



  var offsets = void 0;

  if (isNumeric(+offset)) {

    offsets = [+offset, 0];

  } else {

    offsets = parseOffset(offset, popper, reference, basePlacement);

  }



  if (basePlacement === 'left') {

    popper.top += offsets[0];

    popper.left -= offsets[1];

  } else if (basePlacement === 'right') {

    popper.top += offsets[0];

    popper.left += offsets[1];

  } else if (basePlacement === 'top') {

    popper.left += offsets[0];

    popper.top -= offsets[1];

  } else if (basePlacement === 'bottom') {

    popper.left += offsets[0];

    popper.top += offsets[1];

  }



  data.popper = popper;

  return data;

}



/**

 * @function

 * @memberof Modifiers

 * @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 preventOverflow(data, options) {

  var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);



  // If offsetParent is the reference element, we really want to

  // go one step up and use the next offsetParent as reference to

  // avoid to make this modifier completely useless and look like broken

  if (data.instance.reference === boundariesElement) {

    boundariesElement = getOffsetParent(boundariesElement);

  }



  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement);

  options.boundaries = boundaries;



  var order = options.priority;

  var popper = data.offsets.popper;



  var check = {

    primary: function primary(placement) {

      var value = popper[placement];

      if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {

        value = Math.max(popper[placement], boundaries[placement]);

      }

      return defineProperty({}, placement, value);

    },

    secondary: function secondary(placement) {

      var mainSide = placement === 'right' ? 'left' : 'top';

      var value = popper[mainSide];

      if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {

        value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));

      }

      return defineProperty({}, mainSide, value);

    }

  };



  order.forEach(function (placement) {

    var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';

    popper = _extends({}, popper, check[side](placement));

  });



  data.offsets.popper = popper;



  return data;

}



/**

 * @function

 * @memberof Modifiers

 * @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 shift(data) {

  var placement = data.placement;

  var basePlacement = placement.split('-')[0];

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



  // if shift shiftvariation is specified, run the modifier

  if (shiftvariation) {

    var _data$offsets = data.offsets,

        reference = _data$offsets.reference,

        popper = _data$offsets.popper;



    var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;

    var side = isVertical ? 'left' : 'top';

    var measurement = isVertical ? 'width' : 'height';



    var shiftOffsets = {

      start: defineProperty({}, side, reference[side]),

      end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])

    };



    data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);

  }



  return data;

}



/**

 * @function

 * @memberof Modifiers

 * @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 hide(data) {

  if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {

    return data;

  }



  var refRect = data.offsets.reference;

  var bound = find(data.instance.modifiers, function (modifier) {

    return modifier.name === 'preventOverflow';

  }).boundaries;



  if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {

    // Avoid unnecessary DOM access if visibility hasn't changed

    if (data.hide === true) {

      return data;

    }



    data.hide = true;

    data.attributes['x-out-of-boundaries'] = '';

  } else {

    // Avoid unnecessary DOM access if visibility hasn't changed

    if (data.hide === false) {

      return data;

    }



    data.hide = false;

    data.attributes['x-out-of-boundaries'] = false;

  }



  return data;

}



/**

 * @function

 * @memberof Modifiers

 * @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 inner(data) {

  var placement = data.placement;

  var basePlacement = placement.split('-')[0];

  var _data$offsets = data.offsets,

      popper = _data$offsets.popper,

      reference = _data$offsets.reference;



  var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;



  var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;



  popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);



  data.placement = getOppositePlacement(placement);

  data.offsets.popper = getClientRect(popper);



  return data;

}



/**

 * Modifier function, each modifier can have a function of this type assigned

 * to its `fn` property.<br />

 * These functions will be called on each update, this means that you must

 * make sure they are performant enough to avoid performance bottlenecks.

 *

 * @function ModifierFn

 * @argument {dataObject} data - The data object generated by `update` method

 * @argument {Object} options - Modifiers configuration and options

 * @returns {dataObject} The data object, properly modified

 */



/**

 * Modifiers are plugins used to alter the behavior of your poppers.<br />

 * Popper.js uses a set of 9 modifiers to provide all the basic functionalities

 * needed by the library.

 *

 * Usually you don't want to override the `order`, `fn` and `onLoad` props.

 * All the other properties are configurations that could be tweaked.

 * @namespace modifiers

 */

var modifiers = {

  /**

   * Modifier used to shift the popper on the start or end of its reference

   * element.<br />

   * It will read the variation of the `placement` property.<br />

   * It can be one either `-end` or `-start`.

   * @memberof modifiers

   * @inner

   */

  shift: {

    /** @prop {number} order=100 - Index used to define the order of execution */

    order: 100,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: shift

  },



  /**

   * The `offset` modifier can shift your popper on both its axis.

   *

   * It accepts the following units:

   * - `px` or unitless, interpreted as pixels

   * - `%` or `%r`, percentage relative to the length of the reference element

   * - `%p`, percentage relative to the length of the popper element

   * - `vw`, CSS viewport width unit

   * - `vh`, CSS viewport height unit

   *

   * For length is intended the main axis relative to the placement of the popper.<br />

   * This means that if the placement is `top` or `bottom`, the length will be the

   * `width`. In case of `left` or `right`, it will be the height.

   *

   * You can provide a single value (as `Number` or `String`), or a pair of values

   * as `String` divided by a comma or one (or more) white spaces.<br />

   * The latter is a deprecated method because it leads to confusion and will be

   * removed in v2.<br />

   * Additionally, it accepts additions and subtractions between different units.

   * Note that multiplications and divisions aren't supported.

   *

   * Valid examples are:

   * ```

   * 10

   * '10%'

   * '10, 10'

   * '10%, 10'

   * '10 + 10%'

   * '10 - 5vh + 3%'

   * '-10px + 5vh, 5px - 6%'

   * ```

   * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap

   * > with their reference element, unfortunately, you will have to disable the `flip` modifier.

   * > More on this [reading this issue](https://github.com/FezVrasta/popper.js/issues/373)

   *

   * @memberof modifiers

   * @inner

   */

  offset: {

    /** @prop {number} order=200 - Index used to define the order of execution */

    order: 200,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: offset,

    /** @prop {Number|String} offset=0

     * The offset value as described in the modifier description

     */

    offset: 0

  },



  /**

   * Modifier used to prevent the popper from being positioned outside the boundary.

   *

   * An scenario exists where the reference itself is not within the boundaries.<br />

   * We can say it has "escaped the boundaries" — or just "escaped".<br />

   * In this case we need to decide whether the popper should either:

   *

   * - detach from the reference and remain "trapped" in the boundaries, or

   * - if it should ignore the boundary and "escape with its reference"

   *

   * When `escapeWithReference` is set to`true` and reference is completely

   * outside its boundaries, the popper will overflow (or completely leave)

   * the boundaries in order to remain attached to the edge of the reference.

   *

   * @memberof modifiers

   * @inner

   */

  preventOverflow: {

    /** @prop {number} order=300 - Index used to define the order of execution */

    order: 300,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: preventOverflow,

    /**

     * @prop {Array} [priority=['left','right','top','bottom']]

     * Popper will try to prevent overflow following these priorities by default,

     * then, it could overflow on the left and on top of the `boundariesElement`

     */

    priority: ['left', 'right', 'top', 'bottom'],

    /**

     * @prop {number} padding=5

     * Amount of pixel used to define a minimum distance between the boundaries

     * and the popper this makes sure the popper has always a little padding

     * between the edges of its container

     */

    padding: 5,

    /**

     * @prop {String|HTMLElement} boundariesElement='scrollParent'

     * Boundaries used by the modifier, can be `scrollParent`, `window`,

     * `viewport` or any DOM element.

     */

    boundariesElement: 'scrollParent'

  },



  /**

   * Modifier used to make sure the reference and its popper stay near eachothers

   * without leaving any gap between the two. Expecially useful when the arrow is

   * enabled and you want to assure it to point to its reference element.

   * It cares only about the first axis, you can still have poppers with margin

   * between the popper and its reference element.

   * @memberof modifiers

   * @inner

   */

  keepTogether: {

    /** @prop {number} order=400 - Index used to define the order of execution */

    order: 400,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: keepTogether

  },



  /**

   * This modifier is used to move the `arrowElement` of the popper to make

   * sure it is positioned between the reference element and its popper element.

   * It will read the outer size of the `arrowElement` node to detect how many

   * pixels of conjuction are needed.

   *

   * It has no effect if no `arrowElement` is provided.

   * @memberof modifiers

   * @inner

   */

  arrow: {

    /** @prop {number} order=500 - Index used to define the order of execution */

    order: 500,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: arrow,

    /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */

    element: '[x-arrow]'

  },



  /**

   * Modifier used to flip the popper's placement when it starts to overlap its

   * reference element.

   *

   * Requires the `preventOverflow` modifier before it in order to work.

   *

   * **NOTE:** this modifier will interrupt the current update cycle and will

   * restart it if it detects the need to flip the placement.

   * @memberof modifiers

   * @inner

   */

  flip: {

    /** @prop {number} order=600 - Index used to define the order of execution */

    order: 600,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: flip,

    /**

     * @prop {String|Array} behavior='flip'

     * The behavior used to change the popper's placement. It can be one of

     * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid

     * placements (with optional variations).

     */

    behavior: 'flip',

    /**

     * @prop {number} padding=5

     * The popper will flip if it hits the edges of the `boundariesElement`

     */

    padding: 5,

    /**

     * @prop {String|HTMLElement} boundariesElement='viewport'

     * The element which will define the boundaries of the popper position,

     * the popper will never be placed outside of the defined boundaries

     * (except if keepTogether is enabled)

     */

    boundariesElement: 'viewport'

  },



  /**

   * Modifier used to make the popper flow toward the inner of the reference element.

   * By default, when this modifier is disabled, the popper will be placed outside

   * the reference element.

   * @memberof modifiers

   * @inner

   */

  inner: {

    /** @prop {number} order=700 - Index used to define the order of execution */

    order: 700,

    /** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */

    enabled: false,

    /** @prop {ModifierFn} */

    fn: inner

  },



  /**

   * Modifier used to hide the popper when its reference element is outside of the

   * popper boundaries. It will set a `x-out-of-boundaries` attribute which can

   * be used to hide with a CSS selector the popper when its reference is

   * out of boundaries.

   *

   * Requires the `preventOverflow` modifier before it in order to work.

   * @memberof modifiers

   * @inner

   */

  hide: {

    /** @prop {number} order=800 - Index used to define the order of execution */

    order: 800,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: hide

  },



  /**

   * Computes the style that will be applied to the popper element to gets

   * properly positioned.

   *

   * Note that this modifier will not touch the DOM, it just prepares the styles

   * so that `applyStyle` modifier can apply it. This separation is useful

   * in case you need to replace `applyStyle` with a custom implementation.

   *

   * This modifier has `850` as `order` value to maintain backward compatibility

   * with previous versions of Popper.js. Expect the modifiers ordering method

   * to change in future major versions of the library.

   *

   * @memberof modifiers

   * @inner

   */

  computeStyle: {

    /** @prop {number} order=850 - Index used to define the order of execution */

    order: 850,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: computeStyle,

    /**

     * @prop {Boolean} gpuAcceleration=true

     * If true, it uses the CSS 3d transformation to position the popper.

     * Otherwise, it will use the `top` and `left` properties.

     */

    gpuAcceleration: true,

    /**

     * @prop {string} [x='bottom']

     * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.

     * Change this if your popper should grow in a direction different from `bottom`

     */

    x: 'bottom',

    /**

     * @prop {string} [x='left']

     * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.

     * Change this if your popper should grow in a direction different from `right`

     */

    y: 'right'

  },



  /**

   * Applies the computed styles to the popper element.

   *

   * All the DOM manipulations are limited to this modifier. This is useful in case

   * you want to integrate Popper.js inside a framework or view library and you

   * want to delegate all the DOM manipulations to it.

   *

   * Note that if you disable this modifier, you must make sure the popper element

   * has its position set to `absolute` before Popper.js can do its work!

   *

   * Just disable this modifier and define you own to achieve the desired effect.

   *

   * @memberof modifiers

   * @inner

   */

  applyStyle: {

    /** @prop {number} order=900 - Index used to define the order of execution */

    order: 900,

    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */

    enabled: true,

    /** @prop {ModifierFn} */

    fn: applyStyle,

    /** @prop {Function} */

    onLoad: applyStyleOnLoad,

    /**

     * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier

     * @prop {Boolean} gpuAcceleration=true

     * If true, it uses the CSS 3d transformation to position the popper.

     * Otherwise, it will use the `top` and `left` properties.

     */

    gpuAcceleration: undefined

  }

};



/**

 * The `dataObject` is an object containing all the informations used by Popper.js

 * this object get passed to modifiers and to the `onCreate` and `onUpdate` callbacks.

 * @name dataObject

 * @property {Object} data.instance The Popper.js instance

 * @property {String} data.placement Placement applied to popper

 * @property {String} data.originalPlacement Placement originally defined on init

 * @property {Boolean} data.flipped True if popper has been flipped by flip modifier

 * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper.

 * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier

 * @property {Object} data.styles Any CSS property defined here will be applied to the popper, it expects the JavaScript nomenclature (eg. `marginBottom`)

 * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow, it expects the JavaScript nomenclature (eg. `marginBottom`)

 * @property {Object} data.boundaries Offsets of the popper boundaries

 * @property {Object} data.offsets The measurements of popper, reference and arrow elements.

 * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values

 * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values

 * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0

 */



/**

 * Default options provided to Popper.js constructor.<br />

 * These can be overriden using the `options` argument of Popper.js.<br />

 * To override an option, simply pass as 3rd argument an object with the same

 * structure of this object, example:

 * ```

 * new Popper(ref, pop, {

 *   modifiers: {

 *     preventOverflow: { enabled: false }

 *   }

 * })

 * ```

 * @type {Object}

 * @static

 * @memberof Popper

 */

var Defaults = {

  /**

   * Popper's placement

   * @prop {Popper.placements} placement='bottom'

   */

  placement: 'bottom',



  /**

   * Whether events (resize, scroll) are initially enabled

   * @prop {Boolean} eventsEnabled=true

   */

  eventsEnabled: true,



  /**

   * Set to true if you want to automatically remove the popper when

   * you call the `destroy` method.

   * @prop {Boolean} removeOnDestroy=false

   */

  removeOnDestroy: false,



  /**

   * Callback called when the popper is created.<br />

   * By default, is set to no-op.<br />

   * Access Popper.js instance with `data.instance`.

   * @prop {onCreate}

   */

  onCreate: function onCreate() {},



  /**

   * Callback called when the popper is updated, this callback is not called

   * on the initialization/creation of the popper, but only on subsequent

   * updates.<br />

   * By default, is set to no-op.<br />

   * Access Popper.js instance with `data.instance`.

   * @prop {onUpdate}

   */

  onUpdate: function onUpdate() {},



  /**

   * List of modifiers used to modify the offsets before they are applied to the popper.

   * They provide most of the functionalities of Popper.js

   * @prop {modifiers}

   */

  modifiers: modifiers

};



/**

 * @callback onCreate

 * @param {dataObject} data

 */



/**

 * @callback onUpdate

 * @param {dataObject} data

 */



// Utils

// Methods

var Popper = function () {

  /**

   * Create a new Popper.js instance

   * @class Popper

   * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper

   * @param {HTMLElement} popper - The HTML element used as popper.

   * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)

   * @return {Object} instance - The generated Popper.js instance

   */

  function Popper(reference, popper) {

    var _this = this;



    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

    classCallCheck(this, Popper);



    this.scheduleUpdate = function () {

      return requestAnimationFrame(_this.update);

    };



    // make update() debounced, so that it only runs at most once-per-tick

    this.update = debounce(this.update.bind(this));



    // with {} we create a new object with the options inside it

    this.options = _extends({}, Popper.Defaults, options);



    // init state

    this.state = {

      isDestroyed: false,

      isCreated: false,

      scrollParents: []

    };



    // get reference and popper elements (allow jQuery wrappers)

    this.reference = reference.jquery ? reference[0] : reference;

    this.popper = popper.jquery ? popper[0] : popper;



    // Deep merge modifiers options

    this.options.modifiers = {};

    Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {

      _this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});

    });



    // Refactoring modifiers' list (Object => Array)

    this.modifiers = Object.keys(this.options.modifiers).map(function (name) {

      return _extends({

        name: name

      }, _this.options.modifiers[name]);

    })

    // sort the modifiers by order

    .sort(function (a, b) {

      return a.order - b.order;

    });



    // modifiers have the ability to execute arbitrary code when Popper.js get inited

    // such code is executed in the same order of its modifier

    // they could add new properties to their options configuration

    // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!

    this.modifiers.forEach(function (modifierOptions) {

      if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {

        modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);

      }

    });



    // fire the first update to position the popper in the right place

    this.update();



    var eventsEnabled = this.options.eventsEnabled;

    if (eventsEnabled) {

      // setup event listeners, they will take care of update the position in specific situations

      this.enableEventListeners();

    }



    this.state.eventsEnabled = eventsEnabled;

  }



  // We can't use class properties because they don't get listed in the

  // class prototype and break stuff like Sinon stubs





  createClass(Popper, [{

    key: 'update',

    value: function update$$1() {

      return update.call(this);

    }

  }, {

    key: 'destroy',

    value: function destroy$$1() {

      return destroy.call(this);

    }

  }, {

    key: 'enableEventListeners',

    value: function enableEventListeners$$1() {

      return enableEventListeners.call(this);

    }

  }, {

    key: 'disableEventListeners',

    value: function disableEventListeners$$1() {

      return disableEventListeners.call(this);

    }



    /**

     * Schedule an update, it will run on the next UI update available

     * @method scheduleUpdate

     * @memberof Popper

     */





    /**

     * Collection of utilities useful when writing custom modifiers.

     * Starting from version 1.7, this method is available only if you

     * include `popper-utils.js` before `popper.js`.

     *

     * **DEPRECATION**: This way to access PopperUtils is deprecated

     * and will be removed in v2! Use the PopperUtils module directly instead.

     * Due to the high instability of the methods contained in Utils, we can't

     * guarantee them to follow semver. Use them at your own risk!

     * @static

     * @private

     * @type {Object}

     * @deprecated since version 1.8

     * @member Utils

     * @memberof Popper

     */



  }]);

  return Popper;

}();



/**

 * The `referenceObject` is an object that provides an interface compatible with Popper.js

 * and lets you use it as replacement of a real DOM node.<br />

 * You can use this method to position a popper relatively to a set of coordinates

 * in case you don't have a DOM node to use as reference.

 *

 * ```

 * new Popper(referenceObject, popperNode);

 * ```

 *

 * NB: This feature isn't supported in Internet Explorer 10

 * @name referenceObject

 * @property {Function} data.getBoundingClientRect

 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.

 * @property {number} data.clientWidth

 * An ES6 getter that will return the width of the virtual reference element.

 * @property {number} data.clientHeight

 * An ES6 getter that will return the height of the virtual reference element.

 */





Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;

Popper.placements = placements;

Popper.Defaults = Defaults;



return Popper;



})));

//# sourceMappingURL=popper.js.map

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