LaravelTest

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/**!
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 * @fileOverview Kickass library to create and place poppers near their reference elements.
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 * @version 1.16.1
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 * @license
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 * Copyright (c) 2016 Federico Zivolo and contributors
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in all
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 * copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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 * SOFTWARE.
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 */
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(function (global, factory) {
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	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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	typeof define === 'function' && define.amd ? define(factory) :
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	(global.Popper = factory());
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}(this, (function () { 'use strict';
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var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && typeof navigator !== 'undefined';
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var timeoutDuration = function () {
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  var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
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  for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
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    if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
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      return 1;
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    }
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  }
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  return 0;
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}();
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function microtaskDebounce(fn) {
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  var called = false;
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  return function () {
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    if (called) {
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      return;
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    }
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    called = true;
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    window.Promise.resolve().then(function () {
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      called = false;
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      fn();
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    });
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  };
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}
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function taskDebounce(fn) {
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  var scheduled = false;
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  return function () {
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    if (!scheduled) {
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      scheduled = true;
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      setTimeout(function () {
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        scheduled = false;
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        fn();
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      }, timeoutDuration);
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    }
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  };
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}
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var supportsMicroTasks = isBrowser && window.Promise;
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/**
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* Create a debounced version of a method, that's asynchronously deferred
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* but called in the minimum time possible.
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*
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* @method
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* @memberof Popper.Utils
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* @argument {Function} fn
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* @returns {Function}
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*/
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var debounce = supportsMicroTasks ? microtaskDebounce : taskDebounce;
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/**
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 * Check if the given variable is a function
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Any} functionToCheck - variable to check
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 * @returns {Boolean} answer to: is a function?
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 */
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function isFunction(functionToCheck) {
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  var getType = {};
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  return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
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}
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/**
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 * Get CSS computed property of the given element
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Eement} element
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 * @argument {String} property
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 */
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function getStyleComputedProperty(element, property) {
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  if (element.nodeType !== 1) {
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    return [];
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  }
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  // NOTE: 1 DOM access here
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  var window = element.ownerDocument.defaultView;
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  var css = window.getComputedStyle(element, null);
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  return property ? css[property] : css;
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}
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/**
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 * Returns the parentNode or the host of the element
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Element} element
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 * @returns {Element} parent
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 */
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function getParentNode(element) {
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  if (element.nodeName === 'HTML') {
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    return element;
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  }
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  return element.parentNode || element.host;
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}
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/**
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 * Returns the scrolling parent of the given element
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Element} element
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 * @returns {Element} scroll parent
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 */
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function getScrollParent(element) {
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  // Return body, `getScroll` will take care to get the correct `scrollTop` from it
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  if (!element) {
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    return document.body;
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  }
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  switch (element.nodeName) {
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    case 'HTML':
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    case 'BODY':
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      return element.ownerDocument.body;
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    case '#document':
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      return element.body;
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  }
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  // Firefox want us to check `-x` and `-y` variations as well
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  var _getStyleComputedProp = getStyleComputedProperty(element),
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      overflow = _getStyleComputedProp.overflow,
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      overflowX = _getStyleComputedProp.overflowX,
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      overflowY = _getStyleComputedProp.overflowY;
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  if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
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    return element;
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  }
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  return getScrollParent(getParentNode(element));
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}
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/**
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 * Returns the reference node of the reference object, or the reference object itself.
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 * @method
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 * @memberof Popper.Utils
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 * @param {Element|Object} reference - the reference element (the popper will be relative to this)
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 * @returns {Element} parent
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 */
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function getReferenceNode(reference) {
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  return reference && reference.referenceNode ? reference.referenceNode : reference;
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}
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var isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
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var isIE10 = isBrowser && /MSIE 10/.test(navigator.userAgent);
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/**
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 * Determines if the browser is Internet Explorer
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 * @method
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 * @memberof Popper.Utils
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 * @param {Number} version to check
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 * @returns {Boolean} isIE
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 */
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function isIE(version) {
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  if (version === 11) {
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    return isIE11;
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  }
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  if (version === 10) {
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    return isIE10;
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  }
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  return isIE11 || isIE10;
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}
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/**
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 * Returns the offset parent of the given element
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Element} element
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 * @returns {Element} offset parent
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 */
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function getOffsetParent(element) {
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  if (!element) {
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    return document.documentElement;
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  }
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  var noOffsetParent = isIE(10) ? document.body : null;
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  // NOTE: 1 DOM access here
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  var offsetParent = element.offsetParent || null;
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  // Skip hidden elements which don't have an offsetParent
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  while (offsetParent === noOffsetParent && element.nextElementSibling) {
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    offsetParent = (element = element.nextElementSibling).offsetParent;
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  }
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  var nodeName = offsetParent && offsetParent.nodeName;
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  if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
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    return element ? element.ownerDocument.documentElement : document.documentElement;
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  }
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  // .offsetParent will return the closest TH, TD or TABLE in case
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  // no offsetParent is present, I hate this job...
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  if (['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
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    return getOffsetParent(offsetParent);
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  }
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  return offsetParent;
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}
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function isOffsetContainer(element) {
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  var nodeName = element.nodeName;
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  if (nodeName === 'BODY') {
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    return false;
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  }
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  return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
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}
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/**
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 * Finds the root node (document, shadowDOM root) of the given element
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Element} node
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 * @returns {Element} root node
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 */
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function getRoot(node) {
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  if (node.parentNode !== null) {
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    return getRoot(node.parentNode);
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  }
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  return node;
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}
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/**
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 * Finds the offset parent common to the two provided nodes
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Element} element1
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 * @argument {Element} element2
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 * @returns {Element} common offset parent
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 */
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function findCommonOffsetParent(element1, element2) {
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  // This check is needed to avoid errors in case one of the elements isn't defined for any reason
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  if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
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    return document.documentElement;
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  }
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  // Here we make sure to give as "start" the element that comes first in the DOM
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  var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
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  var start = order ? element1 : element2;
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  var end = order ? element2 : element1;
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  // Get common ancestor container
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  var range = document.createRange();
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  range.setStart(start, 0);
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  range.setEnd(end, 0);
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  var commonAncestorContainer = range.commonAncestorContainer;
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  // Both nodes are inside #document
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  if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
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    if (isOffsetContainer(commonAncestorContainer)) {
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      return commonAncestorContainer;
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    }
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    return getOffsetParent(commonAncestorContainer);
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  }
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  // one of the nodes is inside shadowDOM, find which one
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  var element1root = getRoot(element1);
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  if (element1root.host) {
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    return findCommonOffsetParent(element1root.host, element2);
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  } else {
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    return findCommonOffsetParent(element1, getRoot(element2).host);
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  }
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}
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/**
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 * Gets the scroll value of the given element in the given side (top and left)
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 * @method
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 * @memberof Popper.Utils
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 * @argument {Element} element
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 * @argument {String} side `top` or `left`
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 * @returns {number} amount of scrolled pixels
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 */
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function getScroll(element) {
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  var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
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  var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
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  var nodeName = element.nodeName;
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  if (nodeName === 'BODY' || nodeName === 'HTML') {
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    var html = element.ownerDocument.documentElement;
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    var scrollingElement = element.ownerDocument.scrollingElement || html;
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    return scrollingElement[upperSide];
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  }
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  return element[upperSide];
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}
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/*
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 * Sum or subtract the element scroll values (left and top) from a given rect object
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 * @method
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 * @memberof Popper.Utils
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 * @param {Object} rect - Rect object you want to change
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 * @param {HTMLElement} element - The element from the function reads the scroll values
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 * @param {Boolean} subtract - set to true if you want to subtract the scroll values
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 * @return {Object} rect - The modifier rect object
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 */
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function includeScroll(rect, element) {
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  var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
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  var scrollTop = getScroll(element, 'top');
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  var scrollLeft = getScroll(element, 'left');
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  var modifier = subtract ? -1 : 1;
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  rect.top += scrollTop * modifier;
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  rect.bottom += scrollTop * modifier;
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  rect.left += scrollLeft * modifier;
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  rect.right += scrollLeft * modifier;
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  return rect;
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}
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/*
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 * Helper to detect borders of a given element
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 * @method
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 * @memberof Popper.Utils
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 * @param {CSSStyleDeclaration} styles
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 * Result of `getStyleComputedProperty` on the given element
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 * @param {String} axis - `x` or `y`
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 * @return {number} borders - The borders size of the given axis
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 */
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function getBordersSize(styles, axis) {
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  var sideA = axis === 'x' ? 'Left' : 'Top';
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  var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
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  return parseFloat(styles['border' + sideA + 'Width']) + parseFloat(styles['border' + sideB + 'Width']);
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}
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function getSize(axis, body, html, computedStyle) {
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  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);
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}
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function getWindowSizes(document) {
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  var body = document.body;
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  var html = document.documentElement;
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  var computedStyle = isIE(10) && getComputedStyle(html);
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  return {
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    height: getSize('Height', body, html, computedStyle),
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    width: getSize('Width', body, html, computedStyle)
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  };
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}
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var classCallCheck = function (instance, Constructor) {
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  if (!(instance instanceof Constructor)) {
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    throw new TypeError("Cannot call a class as a function");
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  }
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};
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var createClass = function () {
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  function defineProperties(target, props) {
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    for (var i = 0; i < props.length; i++) {
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      var descriptor = props[i];
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      descriptor.enumerable = descriptor.enumerable || false;
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      descriptor.configurable = true;
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      if ("value" in descriptor) descriptor.writable = true;
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      Object.defineProperty(target, descriptor.key, descriptor);
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    }
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  }
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  return function (Constructor, protoProps, staticProps) {
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    if (protoProps) defineProperties(Constructor.prototype, protoProps);
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    if (staticProps) defineProperties(Constructor, staticProps);
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    return Constructor;
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  };
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}();
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var defineProperty = function (obj, key, value) {
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  if (key in obj) {
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    Object.defineProperty(obj, key, {
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      value: value,
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      enumerable: true,
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      configurable: true,
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      writable: true
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    });
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  } else {
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    obj[key] = value;
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  }
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  return obj;
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};
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var _extends = Object.assign || function (target) {
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  for (var i = 1; i < arguments.length; i++) {
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    var source = arguments[i];
419

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    for (var key in source) {
421
      if (Object.prototype.hasOwnProperty.call(source, key)) {
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        target[key] = source[key];
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      }
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    }
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  }
426

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  return target;
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};
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/**
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 * Given element offsets, generate an output similar to getBoundingClientRect
432
 * @method
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 * @memberof Popper.Utils
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 * @argument {Object} offsets
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 * @returns {Object} ClientRect like output
436
 */
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function getClientRect(offsets) {
438
  return _extends({}, offsets, {
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    right: offsets.left + offsets.width,
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    bottom: offsets.top + offsets.height
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  });
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}
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/**
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 * Get bounding client rect of given element
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 * @method
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 * @memberof Popper.Utils
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 * @param {HTMLElement} element
449
 * @return {Object} client rect
450
 */
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function getBoundingClientRect(element) {
452
  var rect = {};
453

454
  // IE10 10 FIX: Please, don't ask, the element isn't
455
  // considered in DOM in some circumstances...
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  // This isn't reproducible in IE10 compatibility mode of IE11
457
  try {
458
    if (isIE(10)) {
459
      rect = element.getBoundingClientRect();
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      var scrollTop = getScroll(element, 'top');
461
      var scrollLeft = getScroll(element, 'left');
462
      rect.top += scrollTop;
463
      rect.left += scrollLeft;
464
      rect.bottom += scrollTop;
465
      rect.right += scrollLeft;
466
    } else {
467
      rect = element.getBoundingClientRect();
468
    }
469
  } catch (e) {}
470

471
  var result = {
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    left: rect.left,
473
    top: rect.top,
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    width: rect.right - rect.left,
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    height: rect.bottom - rect.top
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  };
477

478
  // subtract scrollbar size from sizes
479
  var sizes = element.nodeName === 'HTML' ? getWindowSizes(element.ownerDocument) : {};
480
  var width = sizes.width || element.clientWidth || result.width;
481
  var height = sizes.height || element.clientHeight || result.height;
482

483
  var horizScrollbar = element.offsetWidth - width;
484
  var vertScrollbar = element.offsetHeight - height;
485

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  // if an hypothetical scrollbar is detected, we must be sure it's not a `border`
487
  // we make this check conditional for performance reasons
488
  if (horizScrollbar || vertScrollbar) {
489
    var styles = getStyleComputedProperty(element);
490
    horizScrollbar -= getBordersSize(styles, 'x');
491
    vertScrollbar -= getBordersSize(styles, 'y');
492

493
    result.width -= horizScrollbar;
494
    result.height -= vertScrollbar;
495
  }
496

497
  return getClientRect(result);
498
}
499

500
function getOffsetRectRelativeToArbitraryNode(children, parent) {
501
  var fixedPosition = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
502

503
  var isIE10 = isIE(10);
504
  var isHTML = parent.nodeName === 'HTML';
505
  var childrenRect = getBoundingClientRect(children);
506
  var parentRect = getBoundingClientRect(parent);
507
  var scrollParent = getScrollParent(children);
508

509
  var styles = getStyleComputedProperty(parent);
510
  var borderTopWidth = parseFloat(styles.borderTopWidth);
511
  var borderLeftWidth = parseFloat(styles.borderLeftWidth);
512

513
  // In cases where the parent is fixed, we must ignore negative scroll in offset calc
514
  if (fixedPosition && isHTML) {
515
    parentRect.top = Math.max(parentRect.top, 0);
516
    parentRect.left = Math.max(parentRect.left, 0);
517
  }
518
  var offsets = getClientRect({
519
    top: childrenRect.top - parentRect.top - borderTopWidth,
520
    left: childrenRect.left - parentRect.left - borderLeftWidth,
521
    width: childrenRect.width,
522
    height: childrenRect.height
523
  });
524
  offsets.marginTop = 0;
525
  offsets.marginLeft = 0;
526

527
  // Subtract margins of documentElement in case it's being used as parent
528
  // we do this only on HTML because it's the only element that behaves
529
  // differently when margins are applied to it. The margins are included in
530
  // the box of the documentElement, in the other cases not.
531
  if (!isIE10 && isHTML) {
532
    var marginTop = parseFloat(styles.marginTop);
533
    var marginLeft = parseFloat(styles.marginLeft);
534

535
    offsets.top -= borderTopWidth - marginTop;
536
    offsets.bottom -= borderTopWidth - marginTop;
537
    offsets.left -= borderLeftWidth - marginLeft;
538
    offsets.right -= borderLeftWidth - marginLeft;
539

540
    // Attach marginTop and marginLeft because in some circumstances we may need them
541
    offsets.marginTop = marginTop;
542
    offsets.marginLeft = marginLeft;
543
  }
544

545
  if (isIE10 && !fixedPosition ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {
546
    offsets = includeScroll(offsets, parent);
547
  }
548

549
  return offsets;
550
}
551

552
function getViewportOffsetRectRelativeToArtbitraryNode(element) {
553
  var excludeScroll = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
554

555
  var html = element.ownerDocument.documentElement;
556
  var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
557
  var width = Math.max(html.clientWidth, window.innerWidth || 0);
558
  var height = Math.max(html.clientHeight, window.innerHeight || 0);
559

560
  var scrollTop = !excludeScroll ? getScroll(html) : 0;
561
  var scrollLeft = !excludeScroll ? getScroll(html, 'left') : 0;
562

563
  var offset = {
564
    top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
565
    left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
566
    width: width,
567
    height: height
568
  };
569

570
  return getClientRect(offset);
571
}
572

573
/**
574
 * Check if the given element is fixed or is inside a fixed parent
575
 * @method
576
 * @memberof Popper.Utils
577
 * @argument {Element} element
578
 * @argument {Element} customContainer
579
 * @returns {Boolean} answer to "isFixed?"
580
 */
581
function isFixed(element) {
582
  var nodeName = element.nodeName;
583
  if (nodeName === 'BODY' || nodeName === 'HTML') {
584
    return false;
585
  }
586
  if (getStyleComputedProperty(element, 'position') === 'fixed') {
587
    return true;
588
  }
589
  var parentNode = getParentNode(element);
590
  if (!parentNode) {
591
    return false;
592
  }
593
  return isFixed(parentNode);
594
}
595

596
/**
597
 * Finds the first parent of an element that has a transformed property defined
598
 * @method
599
 * @memberof Popper.Utils
600
 * @argument {Element} element
601
 * @returns {Element} first transformed parent or documentElement
602
 */
603

604
function getFixedPositionOffsetParent(element) {
605
  // This check is needed to avoid errors in case one of the elements isn't defined for any reason
606
  if (!element || !element.parentElement || isIE()) {
607
    return document.documentElement;
608
  }
609
  var el = element.parentElement;
610
  while (el && getStyleComputedProperty(el, 'transform') === 'none') {
611
    el = el.parentElement;
612
  }
613
  return el || document.documentElement;
614
}
615

616
/**
617
 * Computed the boundaries limits and return them
618
 * @method
619
 * @memberof Popper.Utils
620
 * @param {HTMLElement} popper
621
 * @param {HTMLElement} reference
622
 * @param {number} padding
623
 * @param {HTMLElement} boundariesElement - Element used to define the boundaries
624
 * @param {Boolean} fixedPosition - Is in fixed position mode
625
 * @returns {Object} Coordinates of the boundaries
626
 */
627
function getBoundaries(popper, reference, padding, boundariesElement) {
628
  var fixedPosition = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
629

630
  // NOTE: 1 DOM access here
631

632
  var boundaries = { top: 0, left: 0 };
633
  var offsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, getReferenceNode(reference));
634

635
  // Handle viewport case
636
  if (boundariesElement === 'viewport') {
637
    boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent, fixedPosition);
638
  } else {
639
    // Handle other cases based on DOM element used as boundaries
640
    var boundariesNode = void 0;
641
    if (boundariesElement === 'scrollParent') {
642
      boundariesNode = getScrollParent(getParentNode(reference));
643
      if (boundariesNode.nodeName === 'BODY') {
644
        boundariesNode = popper.ownerDocument.documentElement;
645
      }
646
    } else if (boundariesElement === 'window') {
647
      boundariesNode = popper.ownerDocument.documentElement;
648
    } else {
649
      boundariesNode = boundariesElement;
650
    }
651

652
    var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent, fixedPosition);
653

654
    // In case of HTML, we need a different computation
655
    if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
656
      var _getWindowSizes = getWindowSizes(popper.ownerDocument),
657
          height = _getWindowSizes.height,
658
          width = _getWindowSizes.width;
659

660
      boundaries.top += offsets.top - offsets.marginTop;
661
      boundaries.bottom = height + offsets.top;
662
      boundaries.left += offsets.left - offsets.marginLeft;
663
      boundaries.right = width + offsets.left;
664
    } else {
665
      // for all the other DOM elements, this one is good
666
      boundaries = offsets;
667
    }
668
  }
669

670
  // Add paddings
671
  padding = padding || 0;
672
  var isPaddingNumber = typeof padding === 'number';
673
  boundaries.left += isPaddingNumber ? padding : padding.left || 0;
674
  boundaries.top += isPaddingNumber ? padding : padding.top || 0;
675
  boundaries.right -= isPaddingNumber ? padding : padding.right || 0;
676
  boundaries.bottom -= isPaddingNumber ? padding : padding.bottom || 0;
677

678
  return boundaries;
679
}
680

681
function getArea(_ref) {
682
  var width = _ref.width,
683
      height = _ref.height;
684

685
  return width * height;
686
}
687

688
/**
689
 * Utility used to transform the `auto` placement to the placement with more
690
 * available space.
691
 * @method
692
 * @memberof Popper.Utils
693
 * @argument {Object} data - The data object generated by update method
694
 * @argument {Object} options - Modifiers configuration and options
695
 * @returns {Object} The data object, properly modified
696
 */
697
function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
698
  var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
699

700
  if (placement.indexOf('auto') === -1) {
701
    return placement;
702
  }
703

704
  var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
705

706
  var rects = {
707
    top: {
708
      width: boundaries.width,
709
      height: refRect.top - boundaries.top
710
    },
711
    right: {
712
      width: boundaries.right - refRect.right,
713
      height: boundaries.height
714
    },
715
    bottom: {
716
      width: boundaries.width,
717
      height: boundaries.bottom - refRect.bottom
718
    },
719
    left: {
720
      width: refRect.left - boundaries.left,
721
      height: boundaries.height
722
    }
723
  };
724

725
  var sortedAreas = Object.keys(rects).map(function (key) {
726
    return _extends({
727
      key: key
728
    }, rects[key], {
729
      area: getArea(rects[key])
730
    });
731
  }).sort(function (a, b) {
732
    return b.area - a.area;
733
  });
734

735
  var filteredAreas = sortedAreas.filter(function (_ref2) {
736
    var width = _ref2.width,
737
        height = _ref2.height;
738
    return width >= popper.clientWidth && height >= popper.clientHeight;
739
  });
740

741
  var computedPlacement = filteredAreas.length > 0 ? filteredAreas[0].key : sortedAreas[0].key;
742

743
  var variation = placement.split('-')[1];
744

745
  return computedPlacement + (variation ? '-' + variation : '');
746
}
747

748
/**
749
 * Get offsets to the reference element
750
 * @method
751
 * @memberof Popper.Utils
752
 * @param {Object} state
753
 * @param {Element} popper - the popper element
754
 * @param {Element} reference - the reference element (the popper will be relative to this)
755
 * @param {Element} fixedPosition - is in fixed position mode
756
 * @returns {Object} An object containing the offsets which will be applied to the popper
757
 */
758
function getReferenceOffsets(state, popper, reference) {
759
  var fixedPosition = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
760

761
  var commonOffsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, getReferenceNode(reference));
762
  return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent, fixedPosition);
763
}
764

765
/**
766
 * Get the outer sizes of the given element (offset size + margins)
767
 * @method
768
 * @memberof Popper.Utils
769
 * @argument {Element} element
770
 * @returns {Object} object containing width and height properties
771
 */
772
function getOuterSizes(element) {
773
  var window = element.ownerDocument.defaultView;
774
  var styles = window.getComputedStyle(element);
775
  var x = parseFloat(styles.marginTop || 0) + parseFloat(styles.marginBottom || 0);
776
  var y = parseFloat(styles.marginLeft || 0) + parseFloat(styles.marginRight || 0);
777
  var result = {
778
    width: element.offsetWidth + y,
779
    height: element.offsetHeight + x
780
  };
781
  return result;
782
}
783

784
/**
785
 * Get the opposite placement of the given one
786
 * @method
787
 * @memberof Popper.Utils
788
 * @argument {String} placement
789
 * @returns {String} flipped placement
790
 */
791
function getOppositePlacement(placement) {
792
  var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
793
  return placement.replace(/left|right|bottom|top/g, function (matched) {
794
    return hash[matched];
795
  });
796
}
797

798
/**
799
 * Get offsets to the popper
800
 * @method
801
 * @memberof Popper.Utils
802
 * @param {Object} position - CSS position the Popper will get applied
803
 * @param {HTMLElement} popper - the popper element
804
 * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
805
 * @param {String} placement - one of the valid placement options
806
 * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
807
 */
808
function getPopperOffsets(popper, referenceOffsets, placement) {
809
  placement = placement.split('-')[0];
810

811
  // Get popper node sizes
812
  var popperRect = getOuterSizes(popper);
813

814
  // Add position, width and height to our offsets object
815
  var popperOffsets = {
816
    width: popperRect.width,
817
    height: popperRect.height
818
  };
819

820
  // depending by the popper placement we have to compute its offsets slightly differently
821
  var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
822
  var mainSide = isHoriz ? 'top' : 'left';
823
  var secondarySide = isHoriz ? 'left' : 'top';
824
  var measurement = isHoriz ? 'height' : 'width';
825
  var secondaryMeasurement = !isHoriz ? 'height' : 'width';
826

827
  popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
828
  if (placement === secondarySide) {
829
    popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
830
  } else {
831
    popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
832
  }
833

834
  return popperOffsets;
835
}
836

837
/**
838
 * Mimics the `find` method of Array
839
 * @method
840
 * @memberof Popper.Utils
841
 * @argument {Array} arr
842
 * @argument prop
843
 * @argument value
844
 * @returns index or -1
845
 */
846
function find(arr, check) {
847
  // use native find if supported
848
  if (Array.prototype.find) {
849
    return arr.find(check);
850
  }
851

852
  // use `filter` to obtain the same behavior of `find`
853
  return arr.filter(check)[0];
854
}
855

856
/**
857
 * Return the index of the matching object
858
 * @method
859
 * @memberof Popper.Utils
860
 * @argument {Array} arr
861
 * @argument prop
862
 * @argument value
863
 * @returns index or -1
864
 */
865
function findIndex(arr, prop, value) {
866
  // use native findIndex if supported
867
  if (Array.prototype.findIndex) {
868
    return arr.findIndex(function (cur) {
869
      return cur[prop] === value;
870
    });
871
  }
872

873
  // use `find` + `indexOf` if `findIndex` isn't supported
874
  var match = find(arr, function (obj) {
875
    return obj[prop] === value;
876
  });
877
  return arr.indexOf(match);
878
}
879

880
/**
881
 * Loop trough the list of modifiers and run them in order,
882
 * each of them will then edit the data object.
883
 * @method
884
 * @memberof Popper.Utils
885
 * @param {dataObject} data
886
 * @param {Array} modifiers
887
 * @param {String} ends - Optional modifier name used as stopper
888
 * @returns {dataObject}
889
 */
890
function runModifiers(modifiers, data, ends) {
891
  var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
892

893
  modifiersToRun.forEach(function (modifier) {
894
    if (modifier['function']) {
895
      // eslint-disable-line dot-notation
896
      console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
897
    }
898
    var fn = modifier['function'] || modifier.fn; // eslint-disable-line dot-notation
899
    if (modifier.enabled && isFunction(fn)) {
900
      // Add properties to offsets to make them a complete clientRect object
901
      // we do this before each modifier to make sure the previous one doesn't
902
      // mess with these values
903
      data.offsets.popper = getClientRect(data.offsets.popper);
904
      data.offsets.reference = getClientRect(data.offsets.reference);
905

906
      data = fn(data, modifier);
907
    }
908
  });
909

910
  return data;
911
}
912

913
/**
914
 * Updates the position of the popper, computing the new offsets and applying
915
 * the new style.<br />
916
 * Prefer `scheduleUpdate` over `update` because of performance reasons.
917
 * @method
918
 * @memberof Popper
919
 */
920
function update() {
921
  // if popper is destroyed, don't perform any further update
922
  if (this.state.isDestroyed) {
923
    return;
924
  }
925

926
  var data = {
927
    instance: this,
928
    styles: {},
929
    arrowStyles: {},
930
    attributes: {},
931
    flipped: false,
932
    offsets: {}
933
  };
934

935
  // compute reference element offsets
936
  data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference, this.options.positionFixed);
937

938
  // compute auto placement, store placement inside the data object,
939
  // modifiers will be able to edit `placement` if needed
940
  // and refer to originalPlacement to know the original value
941
  data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
942

943
  // store the computed placement inside `originalPlacement`
944
  data.originalPlacement = data.placement;
945

946
  data.positionFixed = this.options.positionFixed;
947

948
  // compute the popper offsets
949
  data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
950

951
  data.offsets.popper.position = this.options.positionFixed ? 'fixed' : 'absolute';
952

953
  // run the modifiers
954
  data = runModifiers(this.modifiers, data);
955

956
  // the first `update` will call `onCreate` callback
957
  // the other ones will call `onUpdate` callback
958
  if (!this.state.isCreated) {
959
    this.state.isCreated = true;
960
    this.options.onCreate(data);
961
  } else {
962
    this.options.onUpdate(data);
963
  }
964
}
965

966
/**
967
 * Helper used to know if the given modifier is enabled.
968
 * @method
969
 * @memberof Popper.Utils
970
 * @returns {Boolean}
971
 */
972
function isModifierEnabled(modifiers, modifierName) {
973
  return modifiers.some(function (_ref) {
974
    var name = _ref.name,
975
        enabled = _ref.enabled;
976
    return enabled && name === modifierName;
977
  });
978
}
979

980
/**
981
 * Get the prefixed supported property name
982
 * @method
983
 * @memberof Popper.Utils
984
 * @argument {String} property (camelCase)
985
 * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
986
 */
987
function getSupportedPropertyName(property) {
988
  var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
989
  var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
990

991
  for (var i = 0; i < prefixes.length; i++) {
992
    var prefix = prefixes[i];
993
    var toCheck = prefix ? '' + prefix + upperProp : property;
994
    if (typeof document.body.style[toCheck] !== 'undefined') {
995
      return toCheck;
996
    }
997
  }
998
  return null;
999
}
1000

1001
/**
1002
 * Destroys the popper.
1003
 * @method
1004
 * @memberof Popper
1005
 */
1006
function destroy() {
1007
  this.state.isDestroyed = true;
1008

1009
  // touch DOM only if `applyStyle` modifier is enabled
1010
  if (isModifierEnabled(this.modifiers, 'applyStyle')) {
1011
    this.popper.removeAttribute('x-placement');
1012
    this.popper.style.position = '';
1013
    this.popper.style.top = '';
1014
    this.popper.style.left = '';
1015
    this.popper.style.right = '';
1016
    this.popper.style.bottom = '';
1017
    this.popper.style.willChange = '';
1018
    this.popper.style[getSupportedPropertyName('transform')] = '';
1019
  }
1020

1021
  this.disableEventListeners();
1022

1023
  // remove the popper if user explicitly asked for the deletion on destroy
1024
  // do not use `remove` because IE11 doesn't support it
1025
  if (this.options.removeOnDestroy) {
1026
    this.popper.parentNode.removeChild(this.popper);
1027
  }
1028
  return this;
1029
}
1030

1031
/**
1032
 * Get the window associated with the element
1033
 * @argument {Element} element
1034
 * @returns {Window}
1035
 */
1036
function getWindow(element) {
1037
  var ownerDocument = element.ownerDocument;
1038
  return ownerDocument ? ownerDocument.defaultView : window;
1039
}
1040

1041
function attachToScrollParents(scrollParent, event, callback, scrollParents) {
1042
  var isBody = scrollParent.nodeName === 'BODY';
1043
  var target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
1044
  target.addEventListener(event, callback, { passive: true });
1045

1046
  if (!isBody) {
1047
    attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
1048
  }
1049
  scrollParents.push(target);
1050
}
1051

1052
/**
1053
 * Setup needed event listeners used to update the popper position
1054
 * @method
1055
 * @memberof Popper.Utils
1056
 * @private
1057
 */
1058
function setupEventListeners(reference, options, state, updateBound) {
1059
  // Resize event listener on window
1060
  state.updateBound = updateBound;
1061
  getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });
1062

1063
  // Scroll event listener on scroll parents
1064
  var scrollElement = getScrollParent(reference);
1065
  attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
1066
  state.scrollElement = scrollElement;
1067
  state.eventsEnabled = true;
1068

1069
  return state;
1070
}
1071

1072
/**
1073
 * It will add resize/scroll events and start recalculating
1074
 * position of the popper element when they are triggered.
1075
 * @method
1076
 * @memberof Popper
1077
 */
1078
function enableEventListeners() {
1079
  if (!this.state.eventsEnabled) {
1080
    this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
1081
  }
1082
}
1083

1084
/**
1085
 * Remove event listeners used to update the popper position
1086
 * @method
1087
 * @memberof Popper.Utils
1088
 * @private
1089
 */
1090
function removeEventListeners(reference, state) {
1091
  // Remove resize event listener on window
1092
  getWindow(reference).removeEventListener('resize', state.updateBound);
1093

1094
  // Remove scroll event listener on scroll parents
1095
  state.scrollParents.forEach(function (target) {
1096
    target.removeEventListener('scroll', state.updateBound);
1097
  });
1098

1099
  // Reset state
1100
  state.updateBound = null;
1101
  state.scrollParents = [];
1102
  state.scrollElement = null;
1103
  state.eventsEnabled = false;
1104
  return state;
1105
}
1106

1107
/**
1108
 * It will remove resize/scroll events and won't recalculate popper position
1109
 * when they are triggered. It also won't trigger `onUpdate` callback anymore,
1110
 * unless you call `update` method manually.
1111
 * @method
1112
 * @memberof Popper
1113
 */
1114
function disableEventListeners() {
1115
  if (this.state.eventsEnabled) {
1116
    cancelAnimationFrame(this.scheduleUpdate);
1117
    this.state = removeEventListeners(this.reference, this.state);
1118
  }
1119
}
1120

1121
/**
1122
 * Tells if a given input is a number
1123
 * @method
1124
 * @memberof Popper.Utils
1125
 * @param {*} input to check
1126
 * @return {Boolean}
1127
 */
1128
function isNumeric(n) {
1129
  return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
1130
}
1131

1132
/**
1133
 * Set the style to the given popper
1134
 * @method
1135
 * @memberof Popper.Utils
1136
 * @argument {Element} element - Element to apply the style to
1137
 * @argument {Object} styles
1138
 * Object with a list of properties and values which will be applied to the element
1139
 */
1140
function setStyles(element, styles) {
1141
  Object.keys(styles).forEach(function (prop) {
1142
    var unit = '';
1143
    // add unit if the value is numeric and is one of the following
1144
    if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
1145
      unit = 'px';
1146
    }
1147
    element.style[prop] = styles[prop] + unit;
1148
  });
1149
}
1150

1151
/**
1152
 * Set the attributes to the given popper
1153
 * @method
1154
 * @memberof Popper.Utils
1155
 * @argument {Element} element - Element to apply the attributes to
1156
 * @argument {Object} styles
1157
 * Object with a list of properties and values which will be applied to the element
1158
 */
1159
function setAttributes(element, attributes) {
1160
  Object.keys(attributes).forEach(function (prop) {
1161
    var value = attributes[prop];
1162
    if (value !== false) {
1163
      element.setAttribute(prop, attributes[prop]);
1164
    } else {
1165
      element.removeAttribute(prop);
1166
    }
1167
  });
1168
}
1169

1170
/**
1171
 * @function
1172
 * @memberof Modifiers
1173
 * @argument {Object} data - The data object generated by `update` method
1174
 * @argument {Object} data.styles - List of style properties - values to apply to popper element
1175
 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
1176
 * @argument {Object} options - Modifiers configuration and options
1177
 * @returns {Object} The same data object
1178
 */
1179
function applyStyle(data) {
1180
  // any property present in `data.styles` will be applied to the popper,
1181
  // in this way we can make the 3rd party modifiers add custom styles to it
1182
  // Be aware, modifiers could override the properties defined in the previous
1183
  // lines of this modifier!
1184
  setStyles(data.instance.popper, data.styles);
1185

1186
  // any property present in `data.attributes` will be applied to the popper,
1187
  // they will be set as HTML attributes of the element
1188
  setAttributes(data.instance.popper, data.attributes);
1189

1190
  // if arrowElement is defined and arrowStyles has some properties
1191
  if (data.arrowElement && Object.keys(data.arrowStyles).length) {
1192
    setStyles(data.arrowElement, data.arrowStyles);
1193
  }
1194

1195
  return data;
1196
}
1197

1198
/**
1199
 * Set the x-placement attribute before everything else because it could be used
1200
 * to add margins to the popper margins needs to be calculated to get the
1201
 * correct popper offsets.
1202
 * @method
1203
 * @memberof Popper.modifiers
1204
 * @param {HTMLElement} reference - The reference element used to position the popper
1205
 * @param {HTMLElement} popper - The HTML element used as popper
1206
 * @param {Object} options - Popper.js options
1207
 */
1208
function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
1209
  // compute reference element offsets
1210
  var referenceOffsets = getReferenceOffsets(state, popper, reference, options.positionFixed);
1211

1212
  // compute auto placement, store placement inside the data object,
1213
  // modifiers will be able to edit `placement` if needed
1214
  // and refer to originalPlacement to know the original value
1215
  var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
1216

1217
  popper.setAttribute('x-placement', placement);
1218

1219
  // Apply `position` to popper before anything else because
1220
  // without the position applied we can't guarantee correct computations
1221
  setStyles(popper, { position: options.positionFixed ? 'fixed' : 'absolute' });
1222

1223
  return options;
1224
}
1225

1226
/**
1227
 * @function
1228
 * @memberof Popper.Utils
1229
 * @argument {Object} data - The data object generated by `update` method
1230
 * @argument {Boolean} shouldRound - If the offsets should be rounded at all
1231
 * @returns {Object} The popper's position offsets rounded
1232
 *
1233
 * The tale of pixel-perfect positioning. It's still not 100% perfect, but as
1234
 * good as it can be within reason.
1235
 * Discussion here: https://github.com/FezVrasta/popper.js/pull/715
1236
 *
1237
 * Low DPI screens cause a popper to be blurry if not using full pixels (Safari
1238
 * as well on High DPI screens).
1239
 *
1240
 * Firefox prefers no rounding for positioning and does not have blurriness on
1241
 * high DPI screens.
1242
 *
1243
 * Only horizontal placement and left/right values need to be considered.
1244
 */
1245
function getRoundedOffsets(data, shouldRound) {
1246
  var _data$offsets = data.offsets,
1247
      popper = _data$offsets.popper,
1248
      reference = _data$offsets.reference;
1249
  var round = Math.round,
1250
      floor = Math.floor;
1251

1252
  var noRound = function noRound(v) {
1253
    return v;
1254
  };
1255

1256
  var referenceWidth = round(reference.width);
1257
  var popperWidth = round(popper.width);
1258

1259
  var isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
1260
  var isVariation = data.placement.indexOf('-') !== -1;
1261
  var sameWidthParity = referenceWidth % 2 === popperWidth % 2;
1262
  var bothOddWidth = referenceWidth % 2 === 1 && popperWidth % 2 === 1;
1263

1264
  var horizontalToInteger = !shouldRound ? noRound : isVertical || isVariation || sameWidthParity ? round : floor;
1265
  var verticalToInteger = !shouldRound ? noRound : round;
1266

1267
  return {
1268
    left: horizontalToInteger(bothOddWidth && !isVariation && shouldRound ? popper.left - 1 : popper.left),
1269
    top: verticalToInteger(popper.top),
1270
    bottom: verticalToInteger(popper.bottom),
1271
    right: horizontalToInteger(popper.right)
1272
  };
1273
}
1274

1275
var isFirefox = isBrowser && /Firefox/i.test(navigator.userAgent);
1276

1277
/**
1278
 * @function
1279
 * @memberof Modifiers
1280
 * @argument {Object} data - The data object generated by `update` method
1281
 * @argument {Object} options - Modifiers configuration and options
1282
 * @returns {Object} The data object, properly modified
1283
 */
1284
function computeStyle(data, options) {
1285
  var x = options.x,
1286
      y = options.y;
1287
  var popper = data.offsets.popper;
1288

1289
  // Remove this legacy support in Popper.js v2
1290

1291
  var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
1292
    return modifier.name === 'applyStyle';
1293
  }).gpuAcceleration;
1294
  if (legacyGpuAccelerationOption !== undefined) {
1295
    console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
1296
  }
1297
  var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
1298

1299
  var offsetParent = getOffsetParent(data.instance.popper);
1300
  var offsetParentRect = getBoundingClientRect(offsetParent);
1301

1302
  // Styles
1303
  var styles = {
1304
    position: popper.position
1305
  };
1306

1307
  var offsets = getRoundedOffsets(data, window.devicePixelRatio < 2 || !isFirefox);
1308

1309
  var sideA = x === 'bottom' ? 'top' : 'bottom';
1310
  var sideB = y === 'right' ? 'left' : 'right';
1311

1312
  // if gpuAcceleration is set to `true` and transform is supported,
1313
  //  we use `translate3d` to apply the position to the popper we
1314
  // automatically use the supported prefixed version if needed
1315
  var prefixedProperty = getSupportedPropertyName('transform');
1316

1317
  // now, let's make a step back and look at this code closely (wtf?)
1318
  // If the content of the popper grows once it's been positioned, it
1319
  // may happen that the popper gets misplaced because of the new content
1320
  // overflowing its reference element
1321
  // To avoid this problem, we provide two options (x and y), which allow
1322
  // the consumer to define the offset origin.
1323
  // If we position a popper on top of a reference element, we can set
1324
  // `x` to `top` to make the popper grow towards its top instead of
1325
  // its bottom.
1326
  var left = void 0,
1327
      top = void 0;
1328
  if (sideA === 'bottom') {
1329
    // when offsetParent is <html> the positioning is relative to the bottom of the screen (excluding the scrollbar)
1330
    // and not the bottom of the html element
1331
    if (offsetParent.nodeName === 'HTML') {
1332
      top = -offsetParent.clientHeight + offsets.bottom;
1333
    } else {
1334
      top = -offsetParentRect.height + offsets.bottom;
1335
    }
1336
  } else {
1337
    top = offsets.top;
1338
  }
1339
  if (sideB === 'right') {
1340
    if (offsetParent.nodeName === 'HTML') {
1341
      left = -offsetParent.clientWidth + offsets.right;
1342
    } else {
1343
      left = -offsetParentRect.width + offsets.right;
1344
    }
1345
  } else {
1346
    left = offsets.left;
1347
  }
1348
  if (gpuAcceleration && prefixedProperty) {
1349
    styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
1350
    styles[sideA] = 0;
1351
    styles[sideB] = 0;
1352
    styles.willChange = 'transform';
1353
  } else {
1354
    // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
1355
    var invertTop = sideA === 'bottom' ? -1 : 1;
1356
    var invertLeft = sideB === 'right' ? -1 : 1;
1357
    styles[sideA] = top * invertTop;
1358
    styles[sideB] = left * invertLeft;
1359
    styles.willChange = sideA + ', ' + sideB;
1360
  }
1361

1362
  // Attributes
1363
  var attributes = {
1364
    'x-placement': data.placement
1365
  };
1366

1367
  // Update `data` attributes, styles and arrowStyles
1368
  data.attributes = _extends({}, attributes, data.attributes);
1369
  data.styles = _extends({}, styles, data.styles);
1370
  data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);
1371

1372
  return data;
1373
}
1374

1375
/**
1376
 * Helper used to know if the given modifier depends from another one.<br />
1377
 * It checks if the needed modifier is listed and enabled.
1378
 * @method
1379
 * @memberof Popper.Utils
1380
 * @param {Array} modifiers - list of modifiers
1381
 * @param {String} requestingName - name of requesting modifier
1382
 * @param {String} requestedName - name of requested modifier
1383
 * @returns {Boolean}
1384
 */
1385
function isModifierRequired(modifiers, requestingName, requestedName) {
1386
  var requesting = find(modifiers, function (_ref) {
1387
    var name = _ref.name;
1388
    return name === requestingName;
1389
  });
1390

1391
  var isRequired = !!requesting && modifiers.some(function (modifier) {
1392
    return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
1393
  });
1394

1395
  if (!isRequired) {
1396
    var _requesting = '`' + requestingName + '`';
1397
    var requested = '`' + requestedName + '`';
1398
    console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
1399
  }
1400
  return isRequired;
1401
}
1402

1403
/**
1404
 * @function
1405
 * @memberof Modifiers
1406
 * @argument {Object} data - The data object generated by update method
1407
 * @argument {Object} options - Modifiers configuration and options
1408
 * @returns {Object} The data object, properly modified
1409
 */
1410
function arrow(data, options) {
1411
  var _data$offsets$arrow;
1412

1413
  // arrow depends on keepTogether in order to work
1414
  if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
1415
    return data;
1416
  }
1417

1418
  var arrowElement = options.element;
1419

1420
  // if arrowElement is a string, suppose it's a CSS selector
1421
  if (typeof arrowElement === 'string') {
1422
    arrowElement = data.instance.popper.querySelector(arrowElement);
1423

1424
    // if arrowElement is not found, don't run the modifier
1425
    if (!arrowElement) {
1426
      return data;
1427
    }
1428
  } else {
1429
    // if the arrowElement isn't a query selector we must check that the
1430
    // provided DOM node is child of its popper node
1431
    if (!data.instance.popper.contains(arrowElement)) {
1432
      console.warn('WARNING: `arrow.element` must be child of its popper element!');
1433
      return data;
1434
    }
1435
  }
1436

1437
  var placement = data.placement.split('-')[0];
1438
  var _data$offsets = data.offsets,
1439
      popper = _data$offsets.popper,
1440
      reference = _data$offsets.reference;
1441

1442
  var isVertical = ['left', 'right'].indexOf(placement) !== -1;
1443

1444
  var len = isVertical ? 'height' : 'width';
1445
  var sideCapitalized = isVertical ? 'Top' : 'Left';
1446
  var side = sideCapitalized.toLowerCase();
1447
  var altSide = isVertical ? 'left' : 'top';
1448
  var opSide = isVertical ? 'bottom' : 'right';
1449
  var arrowElementSize = getOuterSizes(arrowElement)[len];
1450

1451
  //
1452
  // extends keepTogether behavior making sure the popper and its
1453
  // reference have enough pixels in conjunction
1454
  //
1455

1456
  // top/left side
1457
  if (reference[opSide] - arrowElementSize < popper[side]) {
1458
    data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
1459
  }
1460
  // bottom/right side
1461
  if (reference[side] + arrowElementSize > popper[opSide]) {
1462
    data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
1463
  }
1464
  data.offsets.popper = getClientRect(data.offsets.popper);
1465

1466
  // compute center of the popper
1467
  var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
1468

1469
  // Compute the sideValue using the updated popper offsets
1470
  // take popper margin in account because we don't have this info available
1471
  var css = getStyleComputedProperty(data.instance.popper);
1472
  var popperMarginSide = parseFloat(css['margin' + sideCapitalized]);
1473
  var popperBorderSide = parseFloat(css['border' + sideCapitalized + 'Width']);
1474
  var sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;
1475

1476
  // prevent arrowElement from being placed not contiguously to its popper
1477
  sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
1478

1479
  data.arrowElement = arrowElement;
1480
  data.offsets.arrow = (_data$offsets$arrow = {}, defineProperty(_data$offsets$arrow, side, Math.round(sideValue)), defineProperty(_data$offsets$arrow, altSide, ''), _data$offsets$arrow);
1481

1482
  return data;
1483
}
1484

1485
/**
1486
 * Get the opposite placement variation of the given one
1487
 * @method
1488
 * @memberof Popper.Utils
1489
 * @argument {String} placement variation
1490
 * @returns {String} flipped placement variation
1491
 */
1492
function getOppositeVariation(variation) {
1493
  if (variation === 'end') {
1494
    return 'start';
1495
  } else if (variation === 'start') {
1496
    return 'end';
1497
  }
1498
  return variation;
1499
}
1500

1501
/**
1502
 * List of accepted placements to use as values of the `placement` option.<br />
1503
 * Valid placements are:
1504
 * - `auto`
1505
 * - `top`
1506
 * - `right`
1507
 * - `bottom`
1508
 * - `left`
1509
 *
1510
 * Each placement can have a variation from this list:
1511
 * - `-start`
1512
 * - `-end`
1513
 *
1514
 * Variations are interpreted easily if you think of them as the left to right
1515
 * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
1516
 * is right.<br />
1517
 * Vertically (`left` and `right`), `start` is top and `end` is bottom.
1518
 *
1519
 * Some valid examples are:
1520
 * - `top-end` (on top of reference, right aligned)
1521
 * - `right-start` (on right of reference, top aligned)
1522
 * - `bottom` (on bottom, centered)
1523
 * - `auto-end` (on the side with more space available, alignment depends by placement)
1524
 *
1525
 * @static
1526
 * @type {Array}
1527
 * @enum {String}
1528
 * @readonly
1529
 * @method placements
1530
 * @memberof Popper
1531
 */
1532
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'];
1533

1534
// Get rid of `auto` `auto-start` and `auto-end`
1535
var validPlacements = placements.slice(3);
1536

1537
/**
1538
 * Given an initial placement, returns all the subsequent placements
1539
 * clockwise (or counter-clockwise).
1540
 *
1541
 * @method
1542
 * @memberof Popper.Utils
1543
 * @argument {String} placement - A valid placement (it accepts variations)
1544
 * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
1545
 * @returns {Array} placements including their variations
1546
 */
1547
function clockwise(placement) {
1548
  var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
1549

1550
  var index = validPlacements.indexOf(placement);
1551
  var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
1552
  return counter ? arr.reverse() : arr;
1553
}
1554

1555
var BEHAVIORS = {
1556
  FLIP: 'flip',
1557
  CLOCKWISE: 'clockwise',
1558
  COUNTERCLOCKWISE: 'counterclockwise'
1559
};
1560

1561
/**
1562
 * @function
1563
 * @memberof Modifiers
1564
 * @argument {Object} data - The data object generated by update method
1565
 * @argument {Object} options - Modifiers configuration and options
1566
 * @returns {Object} The data object, properly modified
1567
 */
1568
function flip(data, options) {
1569
  // if `inner` modifier is enabled, we can't use the `flip` modifier
1570
  if (isModifierEnabled(data.instance.modifiers, 'inner')) {
1571
    return data;
1572
  }
1573

1574
  if (data.flipped && data.placement === data.originalPlacement) {
1575
    // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
1576
    return data;
1577
  }
1578

1579
  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement, data.positionFixed);
1580

1581
  var placement = data.placement.split('-')[0];
1582
  var placementOpposite = getOppositePlacement(placement);
1583
  var variation = data.placement.split('-')[1] || '';
1584

1585
  var flipOrder = [];
1586

1587
  switch (options.behavior) {
1588
    case BEHAVIORS.FLIP:
1589
      flipOrder = [placement, placementOpposite];
1590
      break;
1591
    case BEHAVIORS.CLOCKWISE:
1592
      flipOrder = clockwise(placement);
1593
      break;
1594
    case BEHAVIORS.COUNTERCLOCKWISE:
1595
      flipOrder = clockwise(placement, true);
1596
      break;
1597
    default:
1598
      flipOrder = options.behavior;
1599
  }
1600

1601
  flipOrder.forEach(function (step, index) {
1602
    if (placement !== step || flipOrder.length === index + 1) {
1603
      return data;
1604
    }
1605

1606
    placement = data.placement.split('-')[0];
1607
    placementOpposite = getOppositePlacement(placement);
1608

1609
    var popperOffsets = data.offsets.popper;
1610
    var refOffsets = data.offsets.reference;
1611

1612
    // using floor because the reference offsets may contain decimals we are not going to consider here
1613
    var floor = Math.floor;
1614
    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);
1615

1616
    var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
1617
    var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
1618
    var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
1619
    var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);
1620

1621
    var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;
1622

1623
    // flip the variation if required
1624
    var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1625

1626
    // flips variation if reference element overflows boundaries
1627
    var flippedVariationByRef = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);
1628

1629
    // flips variation if popper content overflows boundaries
1630
    var flippedVariationByContent = !!options.flipVariationsByContent && (isVertical && variation === 'start' && overflowsRight || isVertical && variation === 'end' && overflowsLeft || !isVertical && variation === 'start' && overflowsBottom || !isVertical && variation === 'end' && overflowsTop);
1631

1632
    var flippedVariation = flippedVariationByRef || flippedVariationByContent;
1633

1634
    if (overlapsRef || overflowsBoundaries || flippedVariation) {
1635
      // this boolean to detect any flip loop
1636
      data.flipped = true;
1637

1638
      if (overlapsRef || overflowsBoundaries) {
1639
        placement = flipOrder[index + 1];
1640
      }
1641

1642
      if (flippedVariation) {
1643
        variation = getOppositeVariation(variation);
1644
      }
1645

1646
      data.placement = placement + (variation ? '-' + variation : '');
1647

1648
      // this object contains `position`, we want to preserve it along with
1649
      // any additional property we may add in the future
1650
      data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
1651

1652
      data = runModifiers(data.instance.modifiers, data, 'flip');
1653
    }
1654
  });
1655
  return data;
1656
}
1657

1658
/**
1659
 * @function
1660
 * @memberof Modifiers
1661
 * @argument {Object} data - The data object generated by update method
1662
 * @argument {Object} options - Modifiers configuration and options
1663
 * @returns {Object} The data object, properly modified
1664
 */
1665
function keepTogether(data) {
1666
  var _data$offsets = data.offsets,
1667
      popper = _data$offsets.popper,
1668
      reference = _data$offsets.reference;
1669

1670
  var placement = data.placement.split('-')[0];
1671
  var floor = Math.floor;
1672
  var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1673
  var side = isVertical ? 'right' : 'bottom';
1674
  var opSide = isVertical ? 'left' : 'top';
1675
  var measurement = isVertical ? 'width' : 'height';
1676

1677
  if (popper[side] < floor(reference[opSide])) {
1678
    data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
1679
  }
1680
  if (popper[opSide] > floor(reference[side])) {
1681
    data.offsets.popper[opSide] = floor(reference[side]);
1682
  }
1683

1684
  return data;
1685
}
1686

1687
/**
1688
 * Converts a string containing value + unit into a px value number
1689
 * @function
1690
 * @memberof {modifiers~offset}
1691
 * @private
1692
 * @argument {String} str - Value + unit string
1693
 * @argument {String} measurement - `height` or `width`
1694
 * @argument {Object} popperOffsets
1695
 * @argument {Object} referenceOffsets
1696
 * @returns {Number|String}
1697
 * Value in pixels, or original string if no values were extracted
1698
 */
1699
function toValue(str, measurement, popperOffsets, referenceOffsets) {
1700
  // separate value from unit
1701
  var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
1702
  var value = +split[1];
1703
  var unit = split[2];
1704

1705
  // If it's not a number it's an operator, I guess
1706
  if (!value) {
1707
    return str;
1708
  }
1709

1710
  if (unit.indexOf('%') === 0) {
1711
    var element = void 0;
1712
    switch (unit) {
1713
      case '%p':
1714
        element = popperOffsets;
1715
        break;
1716
      case '%':
1717
      case '%r':
1718
      default:
1719
        element = referenceOffsets;
1720
    }
1721

1722
    var rect = getClientRect(element);
1723
    return rect[measurement] / 100 * value;
1724
  } else if (unit === 'vh' || unit === 'vw') {
1725
    // if is a vh or vw, we calculate the size based on the viewport
1726
    var size = void 0;
1727
    if (unit === 'vh') {
1728
      size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
1729
    } else {
1730
      size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
1731
    }
1732
    return size / 100 * value;
1733
  } else {
1734
    // if is an explicit pixel unit, we get rid of the unit and keep the value
1735
    // if is an implicit unit, it's px, and we return just the value
1736
    return value;
1737
  }
1738
}
1739

1740
/**
1741
 * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
1742
 * @function
1743
 * @memberof {modifiers~offset}
1744
 * @private
1745
 * @argument {String} offset
1746
 * @argument {Object} popperOffsets
1747
 * @argument {Object} referenceOffsets
1748
 * @argument {String} basePlacement
1749
 * @returns {Array} a two cells array with x and y offsets in numbers
1750
 */
1751
function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
1752
  var offsets = [0, 0];
1753

1754
  // Use height if placement is left or right and index is 0 otherwise use width
1755
  // in this way the first offset will use an axis and the second one
1756
  // will use the other one
1757
  var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
1758

1759
  // Split the offset string to obtain a list of values and operands
1760
  // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
1761
  var fragments = offset.split(/(\+|\-)/).map(function (frag) {
1762
    return frag.trim();
1763
  });
1764

1765
  // Detect if the offset string contains a pair of values or a single one
1766
  // they could be separated by comma or space
1767
  var divider = fragments.indexOf(find(fragments, function (frag) {
1768
    return frag.search(/,|\s/) !== -1;
1769
  }));
1770

1771
  if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
1772
    console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
1773
  }
1774

1775
  // If divider is found, we divide the list of values and operands to divide
1776
  // them by ofset X and Y.
1777
  var splitRegex = /\s*,\s*|\s+/;
1778
  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];
1779

1780
  // Convert the values with units to absolute pixels to allow our computations
1781
  ops = ops.map(function (op, index) {
1782
    // Most of the units rely on the orientation of the popper
1783
    var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
1784
    var mergeWithPrevious = false;
1785
    return op
1786
    // This aggregates any `+` or `-` sign that aren't considered operators
1787
    // e.g.: 10 + +5 => [10, +, +5]
1788
    .reduce(function (a, b) {
1789
      if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
1790
        a[a.length - 1] = b;
1791
        mergeWithPrevious = true;
1792
        return a;
1793
      } else if (mergeWithPrevious) {
1794
        a[a.length - 1] += b;
1795
        mergeWithPrevious = false;
1796
        return a;
1797
      } else {
1798
        return a.concat(b);
1799
      }
1800
    }, [])
1801
    // Here we convert the string values into number values (in px)
1802
    .map(function (str) {
1803
      return toValue(str, measurement, popperOffsets, referenceOffsets);
1804
    });
1805
  });
1806

1807
  // Loop trough the offsets arrays and execute the operations
1808
  ops.forEach(function (op, index) {
1809
    op.forEach(function (frag, index2) {
1810
      if (isNumeric(frag)) {
1811
        offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
1812
      }
1813
    });
1814
  });
1815
  return offsets;
1816
}
1817

1818
/**
1819
 * @function
1820
 * @memberof Modifiers
1821
 * @argument {Object} data - The data object generated by update method
1822
 * @argument {Object} options - Modifiers configuration and options
1823
 * @argument {Number|String} options.offset=0
1824
 * The offset value as described in the modifier description
1825
 * @returns {Object} The data object, properly modified
1826
 */
1827
function offset(data, _ref) {
1828
  var offset = _ref.offset;
1829
  var placement = data.placement,
1830
      _data$offsets = data.offsets,
1831
      popper = _data$offsets.popper,
1832
      reference = _data$offsets.reference;
1833

1834
  var basePlacement = placement.split('-')[0];
1835

1836
  var offsets = void 0;
1837
  if (isNumeric(+offset)) {
1838
    offsets = [+offset, 0];
1839
  } else {
1840
    offsets = parseOffset(offset, popper, reference, basePlacement);
1841
  }
1842

1843
  if (basePlacement === 'left') {
1844
    popper.top += offsets[0];
1845
    popper.left -= offsets[1];
1846
  } else if (basePlacement === 'right') {
1847
    popper.top += offsets[0];
1848
    popper.left += offsets[1];
1849
  } else if (basePlacement === 'top') {
1850
    popper.left += offsets[0];
1851
    popper.top -= offsets[1];
1852
  } else if (basePlacement === 'bottom') {
1853
    popper.left += offsets[0];
1854
    popper.top += offsets[1];
1855
  }
1856

1857
  data.popper = popper;
1858
  return data;
1859
}
1860

1861
/**
1862
 * @function
1863
 * @memberof Modifiers
1864
 * @argument {Object} data - The data object generated by `update` method
1865
 * @argument {Object} options - Modifiers configuration and options
1866
 * @returns {Object} The data object, properly modified
1867
 */
1868
function preventOverflow(data, options) {
1869
  var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
1870

1871
  // If offsetParent is the reference element, we really want to
1872
  // go one step up and use the next offsetParent as reference to
1873
  // avoid to make this modifier completely useless and look like broken
1874
  if (data.instance.reference === boundariesElement) {
1875
    boundariesElement = getOffsetParent(boundariesElement);
1876
  }
1877

1878
  // NOTE: DOM access here
1879
  // resets the popper's position so that the document size can be calculated excluding
1880
  // the size of the popper element itself
1881
  var transformProp = getSupportedPropertyName('transform');
1882
  var popperStyles = data.instance.popper.style; // assignment to help minification
1883
  var top = popperStyles.top,
1884
      left = popperStyles.left,
1885
      transform = popperStyles[transformProp];
1886

1887
  popperStyles.top = '';
1888
  popperStyles.left = '';
1889
  popperStyles[transformProp] = '';
1890

1891
  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement, data.positionFixed);
1892

1893
  // NOTE: DOM access here
1894
  // restores the original style properties after the offsets have been computed
1895
  popperStyles.top = top;
1896
  popperStyles.left = left;
1897
  popperStyles[transformProp] = transform;
1898

1899
  options.boundaries = boundaries;
1900

1901
  var order = options.priority;
1902
  var popper = data.offsets.popper;
1903

1904
  var check = {
1905
    primary: function primary(placement) {
1906
      var value = popper[placement];
1907
      if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
1908
        value = Math.max(popper[placement], boundaries[placement]);
1909
      }
1910
      return defineProperty({}, placement, value);
1911
    },
1912
    secondary: function secondary(placement) {
1913
      var mainSide = placement === 'right' ? 'left' : 'top';
1914
      var value = popper[mainSide];
1915
      if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
1916
        value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
1917
      }
1918
      return defineProperty({}, mainSide, value);
1919
    }
1920
  };
1921

1922
  order.forEach(function (placement) {
1923
    var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
1924
    popper = _extends({}, popper, check[side](placement));
1925
  });
1926

1927
  data.offsets.popper = popper;
1928

1929
  return data;
1930
}
1931

1932
/**
1933
 * @function
1934
 * @memberof Modifiers
1935
 * @argument {Object} data - The data object generated by `update` method
1936
 * @argument {Object} options - Modifiers configuration and options
1937
 * @returns {Object} The data object, properly modified
1938
 */
1939
function shift(data) {
1940
  var placement = data.placement;
1941
  var basePlacement = placement.split('-')[0];
1942
  var shiftvariation = placement.split('-')[1];
1943

1944
  // if shift shiftvariation is specified, run the modifier
1945
  if (shiftvariation) {
1946
    var _data$offsets = data.offsets,
1947
        reference = _data$offsets.reference,
1948
        popper = _data$offsets.popper;
1949

1950
    var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
1951
    var side = isVertical ? 'left' : 'top';
1952
    var measurement = isVertical ? 'width' : 'height';
1953

1954
    var shiftOffsets = {
1955
      start: defineProperty({}, side, reference[side]),
1956
      end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
1957
    };
1958

1959
    data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
1960
  }
1961

1962
  return data;
1963
}
1964

1965
/**
1966
 * @function
1967
 * @memberof Modifiers
1968
 * @argument {Object} data - The data object generated by update method
1969
 * @argument {Object} options - Modifiers configuration and options
1970
 * @returns {Object} The data object, properly modified
1971
 */
1972
function hide(data) {
1973
  if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
1974
    return data;
1975
  }
1976

1977
  var refRect = data.offsets.reference;
1978
  var bound = find(data.instance.modifiers, function (modifier) {
1979
    return modifier.name === 'preventOverflow';
1980
  }).boundaries;
1981

1982
  if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
1983
    // Avoid unnecessary DOM access if visibility hasn't changed
1984
    if (data.hide === true) {
1985
      return data;
1986
    }
1987

1988
    data.hide = true;
1989
    data.attributes['x-out-of-boundaries'] = '';
1990
  } else {
1991
    // Avoid unnecessary DOM access if visibility hasn't changed
1992
    if (data.hide === false) {
1993
      return data;
1994
    }
1995

1996
    data.hide = false;
1997
    data.attributes['x-out-of-boundaries'] = false;
1998
  }
1999

2000
  return data;
2001
}
2002

2003
/**
2004
 * @function
2005
 * @memberof Modifiers
2006
 * @argument {Object} data - The data object generated by `update` method
2007
 * @argument {Object} options - Modifiers configuration and options
2008
 * @returns {Object} The data object, properly modified
2009
 */
2010
function inner(data) {
2011
  var placement = data.placement;
2012
  var basePlacement = placement.split('-')[0];
2013
  var _data$offsets = data.offsets,
2014
      popper = _data$offsets.popper,
2015
      reference = _data$offsets.reference;
2016

2017
  var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
2018

2019
  var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
2020

2021
  popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
2022

2023
  data.placement = getOppositePlacement(placement);
2024
  data.offsets.popper = getClientRect(popper);
2025

2026
  return data;
2027
}
2028

2029
/**
2030
 * Modifier function, each modifier can have a function of this type assigned
2031
 * to its `fn` property.<br />
2032
 * These functions will be called on each update, this means that you must
2033
 * make sure they are performant enough to avoid performance bottlenecks.
2034
 *
2035
 * @function ModifierFn
2036
 * @argument {dataObject} data - The data object generated by `update` method
2037
 * @argument {Object} options - Modifiers configuration and options
2038
 * @returns {dataObject} The data object, properly modified
2039
 */
2040

2041
/**
2042
 * Modifiers are plugins used to alter the behavior of your poppers.<br />
2043
 * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
2044
 * needed by the library.
2045
 *
2046
 * Usually you don't want to override the `order`, `fn` and `onLoad` props.
2047
 * All the other properties are configurations that could be tweaked.
2048
 * @namespace modifiers
2049
 */
2050
var modifiers = {
2051
  /**
2052
   * Modifier used to shift the popper on the start or end of its reference
2053
   * element.<br />
2054
   * It will read the variation of the `placement` property.<br />
2055
   * It can be one either `-end` or `-start`.
2056
   * @memberof modifiers
2057
   * @inner
2058
   */
2059
  shift: {
2060
    /** @prop {number} order=100 - Index used to define the order of execution */
2061
    order: 100,
2062
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2063
    enabled: true,
2064
    /** @prop {ModifierFn} */
2065
    fn: shift
2066
  },
2067

2068
  /**
2069
   * The `offset` modifier can shift your popper on both its axis.
2070
   *
2071
   * It accepts the following units:
2072
   * - `px` or unit-less, interpreted as pixels
2073
   * - `%` or `%r`, percentage relative to the length of the reference element
2074
   * - `%p`, percentage relative to the length of the popper element
2075
   * - `vw`, CSS viewport width unit
2076
   * - `vh`, CSS viewport height unit
2077
   *
2078
   * For length is intended the main axis relative to the placement of the popper.<br />
2079
   * This means that if the placement is `top` or `bottom`, the length will be the
2080
   * `width`. In case of `left` or `right`, it will be the `height`.
2081
   *
2082
   * You can provide a single value (as `Number` or `String`), or a pair of values
2083
   * as `String` divided by a comma or one (or more) white spaces.<br />
2084
   * The latter is a deprecated method because it leads to confusion and will be
2085
   * removed in v2.<br />
2086
   * Additionally, it accepts additions and subtractions between different units.
2087
   * Note that multiplications and divisions aren't supported.
2088
   *
2089
   * Valid examples are:
2090
   * ```
2091
   * 10
2092
   * '10%'
2093
   * '10, 10'
2094
   * '10%, 10'
2095
   * '10 + 10%'
2096
   * '10 - 5vh + 3%'
2097
   * '-10px + 5vh, 5px - 6%'
2098
   * ```
2099
   * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap
2100
   * > with their reference element, unfortunately, you will have to disable the `flip` modifier.
2101
   * > You can read more on this at this [issue](https://github.com/FezVrasta/popper.js/issues/373).
2102
   *
2103
   * @memberof modifiers
2104
   * @inner
2105
   */
2106
  offset: {
2107
    /** @prop {number} order=200 - Index used to define the order of execution */
2108
    order: 200,
2109
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2110
    enabled: true,
2111
    /** @prop {ModifierFn} */
2112
    fn: offset,
2113
    /** @prop {Number|String} offset=0
2114
     * The offset value as described in the modifier description
2115
     */
2116
    offset: 0
2117
  },
2118

2119
  /**
2120
   * Modifier used to prevent the popper from being positioned outside the boundary.
2121
   *
2122
   * A scenario exists where the reference itself is not within the boundaries.<br />
2123
   * We can say it has "escaped the boundaries" — or just "escaped".<br />
2124
   * In this case we need to decide whether the popper should either:
2125
   *
2126
   * - detach from the reference and remain "trapped" in the boundaries, or
2127
   * - if it should ignore the boundary and "escape with its reference"
2128
   *
2129
   * When `escapeWithReference` is set to`true` and reference is completely
2130
   * outside its boundaries, the popper will overflow (or completely leave)
2131
   * the boundaries in order to remain attached to the edge of the reference.
2132
   *
2133
   * @memberof modifiers
2134
   * @inner
2135
   */
2136
  preventOverflow: {
2137
    /** @prop {number} order=300 - Index used to define the order of execution */
2138
    order: 300,
2139
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2140
    enabled: true,
2141
    /** @prop {ModifierFn} */
2142
    fn: preventOverflow,
2143
    /**
2144
     * @prop {Array} [priority=['left','right','top','bottom']]
2145
     * Popper will try to prevent overflow following these priorities by default,
2146
     * then, it could overflow on the left and on top of the `boundariesElement`
2147
     */
2148
    priority: ['left', 'right', 'top', 'bottom'],
2149
    /**
2150
     * @prop {number} padding=5
2151
     * Amount of pixel used to define a minimum distance between the boundaries
2152
     * and the popper. This makes sure the popper always has a little padding
2153
     * between the edges of its container
2154
     */
2155
    padding: 5,
2156
    /**
2157
     * @prop {String|HTMLElement} boundariesElement='scrollParent'
2158
     * Boundaries used by the modifier. Can be `scrollParent`, `window`,
2159
     * `viewport` or any DOM element.
2160
     */
2161
    boundariesElement: 'scrollParent'
2162
  },
2163

2164
  /**
2165
   * Modifier used to make sure the reference and its popper stay near each other
2166
   * without leaving any gap between the two. Especially useful when the arrow is
2167
   * enabled and you want to ensure that it points to its reference element.
2168
   * It cares only about the first axis. You can still have poppers with margin
2169
   * between the popper and its reference element.
2170
   * @memberof modifiers
2171
   * @inner
2172
   */
2173
  keepTogether: {
2174
    /** @prop {number} order=400 - Index used to define the order of execution */
2175
    order: 400,
2176
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2177
    enabled: true,
2178
    /** @prop {ModifierFn} */
2179
    fn: keepTogether
2180
  },
2181

2182
  /**
2183
   * This modifier is used to move the `arrowElement` of the popper to make
2184
   * sure it is positioned between the reference element and its popper element.
2185
   * It will read the outer size of the `arrowElement` node to detect how many
2186
   * pixels of conjunction are needed.
2187
   *
2188
   * It has no effect if no `arrowElement` is provided.
2189
   * @memberof modifiers
2190
   * @inner
2191
   */
2192
  arrow: {
2193
    /** @prop {number} order=500 - Index used to define the order of execution */
2194
    order: 500,
2195
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2196
    enabled: true,
2197
    /** @prop {ModifierFn} */
2198
    fn: arrow,
2199
    /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */
2200
    element: '[x-arrow]'
2201
  },
2202

2203
  /**
2204
   * Modifier used to flip the popper's placement when it starts to overlap its
2205
   * reference element.
2206
   *
2207
   * Requires the `preventOverflow` modifier before it in order to work.
2208
   *
2209
   * **NOTE:** this modifier will interrupt the current update cycle and will
2210
   * restart it if it detects the need to flip the placement.
2211
   * @memberof modifiers
2212
   * @inner
2213
   */
2214
  flip: {
2215
    /** @prop {number} order=600 - Index used to define the order of execution */
2216
    order: 600,
2217
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2218
    enabled: true,
2219
    /** @prop {ModifierFn} */
2220
    fn: flip,
2221
    /**
2222
     * @prop {String|Array} behavior='flip'
2223
     * The behavior used to change the popper's placement. It can be one of
2224
     * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid
2225
     * placements (with optional variations)
2226
     */
2227
    behavior: 'flip',
2228
    /**
2229
     * @prop {number} padding=5
2230
     * The popper will flip if it hits the edges of the `boundariesElement`
2231
     */
2232
    padding: 5,
2233
    /**
2234
     * @prop {String|HTMLElement} boundariesElement='viewport'
2235
     * The element which will define the boundaries of the popper position.
2236
     * The popper will never be placed outside of the defined boundaries
2237
     * (except if `keepTogether` is enabled)
2238
     */
2239
    boundariesElement: 'viewport',
2240
    /**
2241
     * @prop {Boolean} flipVariations=false
2242
     * The popper will switch placement variation between `-start` and `-end` when
2243
     * the reference element overlaps its boundaries.
2244
     *
2245
     * The original placement should have a set variation.
2246
     */
2247
    flipVariations: false,
2248
    /**
2249
     * @prop {Boolean} flipVariationsByContent=false
2250
     * The popper will switch placement variation between `-start` and `-end` when
2251
     * the popper element overlaps its reference boundaries.
2252
     *
2253
     * The original placement should have a set variation.
2254
     */
2255
    flipVariationsByContent: false
2256
  },
2257

2258
  /**
2259
   * Modifier used to make the popper flow toward the inner of the reference element.
2260
   * By default, when this modifier is disabled, the popper will be placed outside
2261
   * the reference element.
2262
   * @memberof modifiers
2263
   * @inner
2264
   */
2265
  inner: {
2266
    /** @prop {number} order=700 - Index used to define the order of execution */
2267
    order: 700,
2268
    /** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */
2269
    enabled: false,
2270
    /** @prop {ModifierFn} */
2271
    fn: inner
2272
  },
2273

2274
  /**
2275
   * Modifier used to hide the popper when its reference element is outside of the
2276
   * popper boundaries. It will set a `x-out-of-boundaries` attribute which can
2277
   * be used to hide with a CSS selector the popper when its reference is
2278
   * out of boundaries.
2279
   *
2280
   * Requires the `preventOverflow` modifier before it in order to work.
2281
   * @memberof modifiers
2282
   * @inner
2283
   */
2284
  hide: {
2285
    /** @prop {number} order=800 - Index used to define the order of execution */
2286
    order: 800,
2287
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2288
    enabled: true,
2289
    /** @prop {ModifierFn} */
2290
    fn: hide
2291
  },
2292

2293
  /**
2294
   * Computes the style that will be applied to the popper element to gets
2295
   * properly positioned.
2296
   *
2297
   * Note that this modifier will not touch the DOM, it just prepares the styles
2298
   * so that `applyStyle` modifier can apply it. This separation is useful
2299
   * in case you need to replace `applyStyle` with a custom implementation.
2300
   *
2301
   * This modifier has `850` as `order` value to maintain backward compatibility
2302
   * with previous versions of Popper.js. Expect the modifiers ordering method
2303
   * to change in future major versions of the library.
2304
   *
2305
   * @memberof modifiers
2306
   * @inner
2307
   */
2308
  computeStyle: {
2309
    /** @prop {number} order=850 - Index used to define the order of execution */
2310
    order: 850,
2311
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2312
    enabled: true,
2313
    /** @prop {ModifierFn} */
2314
    fn: computeStyle,
2315
    /**
2316
     * @prop {Boolean} gpuAcceleration=true
2317
     * If true, it uses the CSS 3D transformation to position the popper.
2318
     * Otherwise, it will use the `top` and `left` properties
2319
     */
2320
    gpuAcceleration: true,
2321
    /**
2322
     * @prop {string} [x='bottom']
2323
     * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.
2324
     * Change this if your popper should grow in a direction different from `bottom`
2325
     */
2326
    x: 'bottom',
2327
    /**
2328
     * @prop {string} [x='left']
2329
     * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.
2330
     * Change this if your popper should grow in a direction different from `right`
2331
     */
2332
    y: 'right'
2333
  },
2334

2335
  /**
2336
   * Applies the computed styles to the popper element.
2337
   *
2338
   * All the DOM manipulations are limited to this modifier. This is useful in case
2339
   * you want to integrate Popper.js inside a framework or view library and you
2340
   * want to delegate all the DOM manipulations to it.
2341
   *
2342
   * Note that if you disable this modifier, you must make sure the popper element
2343
   * has its position set to `absolute` before Popper.js can do its work!
2344
   *
2345
   * Just disable this modifier and define your own to achieve the desired effect.
2346
   *
2347
   * @memberof modifiers
2348
   * @inner
2349
   */
2350
  applyStyle: {
2351
    /** @prop {number} order=900 - Index used to define the order of execution */
2352
    order: 900,
2353
    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2354
    enabled: true,
2355
    /** @prop {ModifierFn} */
2356
    fn: applyStyle,
2357
    /** @prop {Function} */
2358
    onLoad: applyStyleOnLoad,
2359
    /**
2360
     * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
2361
     * @prop {Boolean} gpuAcceleration=true
2362
     * If true, it uses the CSS 3D transformation to position the popper.
2363
     * Otherwise, it will use the `top` and `left` properties
2364
     */
2365
    gpuAcceleration: undefined
2366
  }
2367
};
2368

2369
/**
2370
 * The `dataObject` is an object containing all the information used by Popper.js.
2371
 * This object is passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
2372
 * @name dataObject
2373
 * @property {Object} data.instance The Popper.js instance
2374
 * @property {String} data.placement Placement applied to popper
2375
 * @property {String} data.originalPlacement Placement originally defined on init
2376
 * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
2377
 * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper
2378
 * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
2379
 * @property {Object} data.styles Any CSS property defined here will be applied to the popper. It expects the JavaScript nomenclature (eg. `marginBottom`)
2380
 * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow. It expects the JavaScript nomenclature (eg. `marginBottom`)
2381
 * @property {Object} data.boundaries Offsets of the popper boundaries
2382
 * @property {Object} data.offsets The measurements of popper, reference and arrow elements
2383
 * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
2384
 * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
2385
 * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
2386
 */
2387

2388
/**
2389
 * Default options provided to Popper.js constructor.<br />
2390
 * These can be overridden using the `options` argument of Popper.js.<br />
2391
 * To override an option, simply pass an object with the same
2392
 * structure of the `options` object, as the 3rd argument. For example:
2393
 * ```
2394
 * new Popper(ref, pop, {
2395
 *   modifiers: {
2396
 *     preventOverflow: { enabled: false }
2397
 *   }
2398
 * })
2399
 * ```
2400
 * @type {Object}
2401
 * @static
2402
 * @memberof Popper
2403
 */
2404
var Defaults = {
2405
  /**
2406
   * Popper's placement.
2407
   * @prop {Popper.placements} placement='bottom'
2408
   */
2409
  placement: 'bottom',
2410

2411
  /**
2412
   * Set this to true if you want popper to position it self in 'fixed' mode
2413
   * @prop {Boolean} positionFixed=false
2414
   */
2415
  positionFixed: false,
2416

2417
  /**
2418
   * Whether events (resize, scroll) are initially enabled.
2419
   * @prop {Boolean} eventsEnabled=true
2420
   */
2421
  eventsEnabled: true,
2422

2423
  /**
2424
   * Set to true if you want to automatically remove the popper when
2425
   * you call the `destroy` method.
2426
   * @prop {Boolean} removeOnDestroy=false
2427
   */
2428
  removeOnDestroy: false,
2429

2430
  /**
2431
   * Callback called when the popper is created.<br />
2432
   * By default, it is set to no-op.<br />
2433
   * Access Popper.js instance with `data.instance`.
2434
   * @prop {onCreate}
2435
   */
2436
  onCreate: function onCreate() {},
2437

2438
  /**
2439
   * Callback called when the popper is updated. This callback is not called
2440
   * on the initialization/creation of the popper, but only on subsequent
2441
   * updates.<br />
2442
   * By default, it is set to no-op.<br />
2443
   * Access Popper.js instance with `data.instance`.
2444
   * @prop {onUpdate}
2445
   */
2446
  onUpdate: function onUpdate() {},
2447

2448
  /**
2449
   * List of modifiers used to modify the offsets before they are applied to the popper.
2450
   * They provide most of the functionalities of Popper.js.
2451
   * @prop {modifiers}
2452
   */
2453
  modifiers: modifiers
2454
};
2455

2456
/**
2457
 * @callback onCreate
2458
 * @param {dataObject} data
2459
 */
2460

2461
/**
2462
 * @callback onUpdate
2463
 * @param {dataObject} data
2464
 */
2465

2466
// Utils
2467
// Methods
2468
var Popper = function () {
2469
  /**
2470
   * Creates a new Popper.js instance.
2471
   * @class Popper
2472
   * @param {Element|referenceObject} reference - The reference element used to position the popper
2473
   * @param {Element} popper - The HTML / XML element used as the popper
2474
   * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
2475
   * @return {Object} instance - The generated Popper.js instance
2476
   */
2477
  function Popper(reference, popper) {
2478
    var _this = this;
2479

2480
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
2481
    classCallCheck(this, Popper);
2482

2483
    this.scheduleUpdate = function () {
2484
      return requestAnimationFrame(_this.update);
2485
    };
2486

2487
    // make update() debounced, so that it only runs at most once-per-tick
2488
    this.update = debounce(this.update.bind(this));
2489

2490
    // with {} we create a new object with the options inside it
2491
    this.options = _extends({}, Popper.Defaults, options);
2492

2493
    // init state
2494
    this.state = {
2495
      isDestroyed: false,
2496
      isCreated: false,
2497
      scrollParents: []
2498
    };
2499

2500
    // get reference and popper elements (allow jQuery wrappers)
2501
    this.reference = reference && reference.jquery ? reference[0] : reference;
2502
    this.popper = popper && popper.jquery ? popper[0] : popper;
2503

2504
    // Deep merge modifiers options
2505
    this.options.modifiers = {};
2506
    Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {
2507
      _this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
2508
    });
2509

2510
    // Refactoring modifiers' list (Object => Array)
2511
    this.modifiers = Object.keys(this.options.modifiers).map(function (name) {
2512
      return _extends({
2513
        name: name
2514
      }, _this.options.modifiers[name]);
2515
    })
2516
    // sort the modifiers by order
2517
    .sort(function (a, b) {
2518
      return a.order - b.order;
2519
    });
2520

2521
    // modifiers have the ability to execute arbitrary code when Popper.js get inited
2522
    // such code is executed in the same order of its modifier
2523
    // they could add new properties to their options configuration
2524
    // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
2525
    this.modifiers.forEach(function (modifierOptions) {
2526
      if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
2527
        modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);
2528
      }
2529
    });
2530

2531
    // fire the first update to position the popper in the right place
2532
    this.update();
2533

2534
    var eventsEnabled = this.options.eventsEnabled;
2535
    if (eventsEnabled) {
2536
      // setup event listeners, they will take care of update the position in specific situations
2537
      this.enableEventListeners();
2538
    }
2539

2540
    this.state.eventsEnabled = eventsEnabled;
2541
  }
2542

2543
  // We can't use class properties because they don't get listed in the
2544
  // class prototype and break stuff like Sinon stubs
2545

2546

2547
  createClass(Popper, [{
2548
    key: 'update',
2549
    value: function update$$1() {
2550
      return update.call(this);
2551
    }
2552
  }, {
2553
    key: 'destroy',
2554
    value: function destroy$$1() {
2555
      return destroy.call(this);
2556
    }
2557
  }, {
2558
    key: 'enableEventListeners',
2559
    value: function enableEventListeners$$1() {
2560
      return enableEventListeners.call(this);
2561
    }
2562
  }, {
2563
    key: 'disableEventListeners',
2564
    value: function disableEventListeners$$1() {
2565
      return disableEventListeners.call(this);
2566
    }
2567

2568
    /**
2569
     * Schedules an update. It will run on the next UI update available.
2570
     * @method scheduleUpdate
2571
     * @memberof Popper
2572
     */
2573

2574

2575
    /**
2576
     * Collection of utilities useful when writing custom modifiers.
2577
     * Starting from version 1.7, this method is available only if you
2578
     * include `popper-utils.js` before `popper.js`.
2579
     *
2580
     * **DEPRECATION**: This way to access PopperUtils is deprecated
2581
     * and will be removed in v2! Use the PopperUtils module directly instead.
2582
     * Due to the high instability of the methods contained in Utils, we can't
2583
     * guarantee them to follow semver. Use them at your own risk!
2584
     * @static
2585
     * @private
2586
     * @type {Object}
2587
     * @deprecated since version 1.8
2588
     * @member Utils
2589
     * @memberof Popper
2590
     */
2591

2592
  }]);
2593
  return Popper;
2594
}();
2595

2596
/**
2597
 * The `referenceObject` is an object that provides an interface compatible with Popper.js
2598
 * and lets you use it as replacement of a real DOM node.<br />
2599
 * You can use this method to position a popper relatively to a set of coordinates
2600
 * in case you don't have a DOM node to use as reference.
2601
 *
2602
 * ```
2603
 * new Popper(referenceObject, popperNode);
2604
 * ```
2605
 *
2606
 * NB: This feature isn't supported in Internet Explorer 10.
2607
 * @name referenceObject
2608
 * @property {Function} data.getBoundingClientRect
2609
 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
2610
 * @property {number} data.clientWidth
2611
 * An ES6 getter that will return the width of the virtual reference element.
2612
 * @property {number} data.clientHeight
2613
 * An ES6 getter that will return the height of the virtual reference element.
2614
 */
2615

2616

2617
Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
2618
Popper.placements = placements;
2619
Popper.Defaults = Defaults;
2620

2621
return Popper;
2622

2623
})));
2624
//# sourceMappingURL=popper.js.map
2625