YAH7XfF6

1/**!
2 * @fileOverview Kickass library to create and place poppers near their reference elements.
3 * @version 1.12.5
4 * @license
5 * Copyright (c) 2016 Federico Zivolo and contributors
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in all
15 * copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25(function (global, factory) {
26	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
27	typeof define === 'function' && define.amd ? define(factory) :
28	(global.Popper = factory());
29}(this, (function () { 'use strict';
30
31var nativeHints = ['native code', '[object MutationObserverConstructor]'];
32
33/**
34 * Determine if a function is implemented natively (as opposed to a polyfill).
35 * @method
36 * @memberof Popper.Utils
37 * @argument {Function | undefined} fn the function to check
38 * @returns {Boolean}
39 */
40var isNative = (function (fn) {
41  return nativeHints.some(function (hint) {
42    return (fn || '').toString().indexOf(hint) > -1;
43  });
44});
45
46var isBrowser = typeof window !== 'undefined';
47var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
48var timeoutDuration = 0;
49for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
50  if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
51    timeoutDuration = 1;
52    break;
53  }
54}
55
56function microtaskDebounce(fn) {
57  var scheduled = false;
58  var i = 0;
59  var elem = document.createElement('span');
60
61  // MutationObserver provides a mechanism for scheduling microtasks, which
62  // are scheduled *before* the next task. This gives us a way to debounce
63  // a function but ensure it's called *before* the next paint.
64  var observer = new MutationObserver(function () {
65    fn();
66    scheduled = false;
67  });
68
69  observer.observe(elem, { attributes: true });
70
71  return function () {
72    if (!scheduled) {
73      scheduled = true;
74      elem.setAttribute('x-index', i);
75      i = i + 1; // don't use compund (+=) because it doesn't get optimized in V8
76    }
77  };
78}
79
80function taskDebounce(fn) {
81  var scheduled = false;
82  return function () {
83    if (!scheduled) {
84      scheduled = true;
85      setTimeout(function () {
86        scheduled = false;
87        fn();
88      }, timeoutDuration);
89    }
90  };
91}
92
93// It's common for MutationObserver polyfills to be seen in the wild, however
94// these rely on Mutation Events which only occur when an element is connected
95// to the DOM. The algorithm used in this module does not use a connected element,
96// and so we must ensure that a *native* MutationObserver is available.
97var supportsNativeMutationObserver = isBrowser && isNative(window.MutationObserver);
98
99/**
100* Create a debounced version of a method, that's asynchronously deferred
101* but called in the minimum time possible.
102*
103* @method
104* @memberof Popper.Utils
105* @argument {Function} fn
106* @returns {Function}
107*/
108var debounce = supportsNativeMutationObserver ? microtaskDebounce : taskDebounce;
109
110/**
111 * Check if the given variable is a function
112 * @method
113 * @memberof Popper.Utils
114 * @argument {Any} functionToCheck - variable to check
115 * @returns {Boolean} answer to: is a function?
116 */
117function isFunction(functionToCheck) {
118  var getType = {};
119  return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
120}
121
122/**
123 * Get CSS computed property of the given element
124 * @method
125 * @memberof Popper.Utils
126 * @argument {Eement} element
127 * @argument {String} property
128 */
129function getStyleComputedProperty(element, property) {
130  if (element.nodeType !== 1) {
131    return [];
132  }
133  // NOTE: 1 DOM access here
134  var css = window.getComputedStyle(element, null);
135  return property ? css[property] : css;
136}
137
138/**
139 * Returns the parentNode or the host of the element
140 * @method
141 * @memberof Popper.Utils
142 * @argument {Element} element
143 * @returns {Element} parent
144 */
145function getParentNode(element) {
146  if (element.nodeName === 'HTML') {
147    return element;
148  }
149  return element.parentNode || element.host;
150}
151
152/**
153 * Returns the scrolling parent of the given element
154 * @method
155 * @memberof Popper.Utils
156 * @argument {Element} element
157 * @returns {Element} scroll parent
158 */
159function getScrollParent(element) {
160  // Return body, `getScroll` will take care to get the correct `scrollTop` from it
161  if (!element || ['HTML', 'BODY', '#document'].indexOf(element.nodeName) !== -1) {
162    return window.document.body;
163  }
164
165  // Firefox want us to check `-x` and `-y` variations as well
166
167  var _getStyleComputedProp = getStyleComputedProperty(element),
168      overflow = _getStyleComputedProp.overflow,
169      overflowX = _getStyleComputedProp.overflowX,
170      overflowY = _getStyleComputedProp.overflowY;
171
172  if (/(auto|scroll)/.test(overflow + overflowY + overflowX)) {
173    return element;
174  }
175
176  return getScrollParent(getParentNode(element));
177}
178
179/**
180 * Returns the offset parent of the given element
181 * @method
182 * @memberof Popper.Utils
183 * @argument {Element} element
184 * @returns {Element} offset parent
185 */
186function getOffsetParent(element) {
187  // NOTE: 1 DOM access here
188  var offsetParent = element && element.offsetParent;
189  var nodeName = offsetParent && offsetParent.nodeName;
190
191  if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
192    return window.document.documentElement;
193  }
194
195  // .offsetParent will return the closest TD or TABLE in case
196  // no offsetParent is present, I hate this job...
197  if (['TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
198    return getOffsetParent(offsetParent);
199  }
200
201  return offsetParent;
202}
203
204function isOffsetContainer(element) {
205  var nodeName = element.nodeName;
206
207  if (nodeName === 'BODY') {
208    return false;
209  }
210  return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
211}
212
213/**
214 * Finds the root node (document, shadowDOM root) of the given element
215 * @method
216 * @memberof Popper.Utils
217 * @argument {Element} node
218 * @returns {Element} root node
219 */
220function getRoot(node) {
221  if (node.parentNode !== null) {
222    return getRoot(node.parentNode);
223  }
224
225  return node;
226}
227
228/**
229 * Finds the offset parent common to the two provided nodes
230 * @method
231 * @memberof Popper.Utils
232 * @argument {Element} element1
233 * @argument {Element} element2
234 * @returns {Element} common offset parent
235 */
236function findCommonOffsetParent(element1, element2) {
237  // This check is needed to avoid errors in case one of the elements isn't defined for any reason
238  if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
239    return window.document.documentElement;
240  }
241
242  // Here we make sure to give as "start" the element that comes first in the DOM
243  var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
244  var start = order ? element1 : element2;
245  var end = order ? element2 : element1;
246
247  // Get common ancestor container
248  var range = document.createRange();
249  range.setStart(start, 0);
250  range.setEnd(end, 0);
251  var commonAncestorContainer = range.commonAncestorContainer;
252
253  // Both nodes are inside #document
254
255  if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
256    if (isOffsetContainer(commonAncestorContainer)) {
257      return commonAncestorContainer;
258    }
259
260    return getOffsetParent(commonAncestorContainer);
261  }
262
263  // one of the nodes is inside shadowDOM, find which one
264  var element1root = getRoot(element1);
265  if (element1root.host) {
266    return findCommonOffsetParent(element1root.host, element2);
267  } else {
268    return findCommonOffsetParent(element1, getRoot(element2).host);
269  }
270}
271
272/**
273 * Gets the scroll value of the given element in the given side (top and left)
274 * @method
275 * @memberof Popper.Utils
276 * @argument {Element} element
277 * @argument {String} side `top` or `left`
278 * @returns {number} amount of scrolled pixels
279 */
280function getScroll(element) {
281  var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
282
283  var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
284  var nodeName = element.nodeName;
285
286  if (nodeName === 'BODY' || nodeName === 'HTML') {
287    var html = window.document.documentElement;
288    var scrollingElement = window.document.scrollingElement || html;
289    return scrollingElement[upperSide];
290  }
291
292  return element[upperSide];
293}
294
295/*
296 * Sum or subtract the element scroll values (left and top) from a given rect object
297 * @method
298 * @memberof Popper.Utils
299 * @param {Object} rect - Rect object you want to change
300 * @param {HTMLElement} element - The element from the function reads the scroll values
301 * @param {Boolean} subtract - set to true if you want to subtract the scroll values
302 * @return {Object} rect - The modifier rect object
303 */
304function includeScroll(rect, element) {
305  var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
306
307  var scrollTop = getScroll(element, 'top');
308  var scrollLeft = getScroll(element, 'left');
309  var modifier = subtract ? -1 : 1;
310  rect.top += scrollTop * modifier;
311  rect.bottom += scrollTop * modifier;
312  rect.left += scrollLeft * modifier;
313  rect.right += scrollLeft * modifier;
314  return rect;
315}
316
317/*
318 * Helper to detect borders of a given element
319 * @method
320 * @memberof Popper.Utils
321 * @param {CSSStyleDeclaration} styles
322 * Result of `getStyleComputedProperty` on the given element
323 * @param {String} axis - `x` or `y`
324 * @return {number} borders - The borders size of the given axis
325 */
326
327function getBordersSize(styles, axis) {
328  var sideA = axis === 'x' ? 'Left' : 'Top';
329  var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
330
331  return +styles['border' + sideA + 'Width'].split('px')[0] + +styles['border' + sideB + 'Width'].split('px')[0];
332}
333
334/**
335 * Tells if you are running Internet Explorer 10
336 * @method
337 * @memberof Popper.Utils
338 * @returns {Boolean} isIE10
339 */
340var isIE10 = undefined;
341
342var isIE10$1 = function () {
343  if (isIE10 === undefined) {
344    isIE10 = navigator.appVersion.indexOf('MSIE 10') !== -1;
345  }
346  return isIE10;
347};
348
349function getSize(axis, body, html, computedStyle) {
350  return Math.max(body['offset' + axis], body['scroll' + axis], html['client' + axis], html['offset' + axis], html['scroll' + axis], isIE10$1() ? html['offset' + axis] + computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')] + computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')] : 0);
351}
352
353function getWindowSizes() {
354  var body = window.document.body;
355  var html = window.document.documentElement;
356  var computedStyle = isIE10$1() && window.getComputedStyle(html);
357
358  return {
359    height: getSize('Height', body, html, computedStyle),
360    width: getSize('Width', body, html, computedStyle)
361  };
362}
363
364var classCallCheck = function (instance, Constructor) {
365  if (!(instance instanceof Constructor)) {
366    throw new TypeError("Cannot call a class as a function");
367  }
368};
369
370var createClass = function () {
371  function defineProperties(target, props) {
372    for (var i = 0; i < props.length; i++) {
373      var descriptor = props[i];
374      descriptor.enumerable = descriptor.enumerable || false;
375      descriptor.configurable = true;
376      if ("value" in descriptor) descriptor.writable = true;
377      Object.defineProperty(target, descriptor.key, descriptor);
378    }
379  }
380
381  return function (Constructor, protoProps, staticProps) {
382    if (protoProps) defineProperties(Constructor.prototype, protoProps);
383    if (staticProps) defineProperties(Constructor, staticProps);
384    return Constructor;
385  };
386}();
387
388
389
390
391
392var defineProperty = function (obj, key, value) {
393  if (key in obj) {
394    Object.defineProperty(obj, key, {
395      value: value,
396      enumerable: true,
397      configurable: true,
398      writable: true
399    });
400  } else {
401    obj[key] = value;
402  }
403
404  return obj;
405};
406
407var _extends = Object.assign || function (target) {
408  for (var i = 1; i < arguments.length; i++) {
409    var source = arguments[i];
410
411    for (var key in source) {
412      if (Object.prototype.hasOwnProperty.call(source, key)) {
413        target[key] = source[key];
414      }
415    }
416  }
417
418  return target;
419};
420
421/**
422 * Given element offsets, generate an output similar to getBoundingClientRect
423 * @method
424 * @memberof Popper.Utils
425 * @argument {Object} offsets
426 * @returns {Object} ClientRect like output
427 */
428function getClientRect(offsets) {
429  return _extends({}, offsets, {
430    right: offsets.left + offsets.width,
431    bottom: offsets.top + offsets.height
432  });
433}
434
435/**
436 * Get bounding client rect of given element
437 * @method
438 * @memberof Popper.Utils
439 * @param {HTMLElement} element
440 * @return {Object} client rect
441 */
442function getBoundingClientRect(element) {
443  var rect = {};
444
445  // IE10 10 FIX: Please, don't ask, the element isn't
446  // considered in DOM in some circumstances...
447  // This isn't reproducible in IE10 compatibility mode of IE11
448  if (isIE10$1()) {
449    try {
450      rect = element.getBoundingClientRect();
451      var scrollTop = getScroll(element, 'top');
452      var scrollLeft = getScroll(element, 'left');
453      rect.top += scrollTop;
454      rect.left += scrollLeft;
455      rect.bottom += scrollTop;
456      rect.right += scrollLeft;
457    } catch (err) {}
458  } else {
459    rect = element.getBoundingClientRect();
460  }
461
462  var result = {
463    left: rect.left,
464    top: rect.top,
465    width: rect.right - rect.left,
466    height: rect.bottom - rect.top
467  };
468
469  // subtract scrollbar size from sizes
470  var sizes = element.nodeName === 'HTML' ? getWindowSizes() : {};
471  var width = sizes.width || element.clientWidth || result.right - result.left;
472  var height = sizes.height || element.clientHeight || result.bottom - result.top;
473
474  var horizScrollbar = element.offsetWidth - width;
475  var vertScrollbar = element.offsetHeight - height;
476
477  // if an hypothetical scrollbar is detected, we must be sure it's not a `border`
478  // we make this check conditional for performance reasons
479  if (horizScrollbar || vertScrollbar) {
480    var styles = getStyleComputedProperty(element);
481    horizScrollbar -= getBordersSize(styles, 'x');
482    vertScrollbar -= getBordersSize(styles, 'y');
483
484    result.width -= horizScrollbar;
485    result.height -= vertScrollbar;
486  }
487
488  return getClientRect(result);
489}
490
491function getOffsetRectRelativeToArbitraryNode(children, parent) {
492  var isIE10 = isIE10$1();
493  var isHTML = parent.nodeName === 'HTML';
494  var childrenRect = getBoundingClientRect(children);
495  var parentRect = getBoundingClientRect(parent);
496  var scrollParent = getScrollParent(children);
497
498  var styles = getStyleComputedProperty(parent);
499  var borderTopWidth = +styles.borderTopWidth.split('px')[0];
500  var borderLeftWidth = +styles.borderLeftWidth.split('px')[0];
501
502  var offsets = getClientRect({
503    top: childrenRect.top - parentRect.top - borderTopWidth,
504    left: childrenRect.left - parentRect.left - borderLeftWidth,
505    width: childrenRect.width,
506    height: childrenRect.height
507  });
508  offsets.marginTop = 0;
509  offsets.marginLeft = 0;
510
511  // Subtract margins of documentElement in case it's being used as parent
512  // we do this only on HTML because it's the only element that behaves
513  // differently when margins are applied to it. The margins are included in
514  // the box of the documentElement, in the other cases not.
515  if (!isIE10 && isHTML) {
516    var marginTop = +styles.marginTop.split('px')[0];
517    var marginLeft = +styles.marginLeft.split('px')[0];
518
519    offsets.top -= borderTopWidth - marginTop;
520    offsets.bottom -= borderTopWidth - marginTop;
521    offsets.left -= borderLeftWidth - marginLeft;
522    offsets.right -= borderLeftWidth - marginLeft;
523
524    // Attach marginTop and marginLeft because in some circumstances we may need them
525    offsets.marginTop = marginTop;
526    offsets.marginLeft = marginLeft;
527  }
528
529  if (isIE10 ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {
530    offsets = includeScroll(offsets, parent);
531  }
532
533  return offsets;
534}
535
536function getViewportOffsetRectRelativeToArtbitraryNode(element) {
537  var html = window.document.documentElement;
538  var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
539  var width = Math.max(html.clientWidth, window.innerWidth || 0);
540  var height = Math.max(html.clientHeight, window.innerHeight || 0);
541
542  var scrollTop = getScroll(html);
543  var scrollLeft = getScroll(html, 'left');
544
545  var offset = {
546    top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
547    left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
548    width: width,
549    height: height
550  };
551
552  return getClientRect(offset);
553}
554
555/**
556 * Check if the given element is fixed or is inside a fixed parent
557 * @method
558 * @memberof Popper.Utils
559 * @argument {Element} element
560 * @argument {Element} customContainer
561 * @returns {Boolean} answer to "isFixed?"
562 */
563function isFixed(element) {
564  var nodeName = element.nodeName;
565  if (nodeName === 'BODY' || nodeName === 'HTML') {
566    return false;
567  }
568  if (getStyleComputedProperty(element, 'position') === 'fixed') {
569    return true;
570  }
571  return isFixed(getParentNode(element));
572}
573
574/**
575 * Computed the boundaries limits and return them
576 * @method
577 * @memberof Popper.Utils
578 * @param {HTMLElement} popper
579 * @param {HTMLElement} reference
580 * @param {number} padding
581 * @param {HTMLElement} boundariesElement - Element used to define the boundaries
582 * @returns {Object} Coordinates of the boundaries
583 */
584function getBoundaries(popper, reference, padding, boundariesElement) {
585  // NOTE: 1 DOM access here
586  var boundaries = { top: 0, left: 0 };
587  var offsetParent = findCommonOffsetParent(popper, reference);
588
589  // Handle viewport case
590  if (boundariesElement === 'viewport') {
591    boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent);
592  } else {
593    // Handle other cases based on DOM element used as boundaries
594    var boundariesNode = void 0;
595    if (boundariesElement === 'scrollParent') {
596      boundariesNode = getScrollParent(getParentNode(popper));
597      if (boundariesNode.nodeName === 'BODY') {
598        boundariesNode = window.document.documentElement;
599      }
600    } else if (boundariesElement === 'window') {
601      boundariesNode = window.document.documentElement;
602    } else {
603      boundariesNode = boundariesElement;
604    }
605
606    var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent);
607
608    // In case of HTML, we need a different computation
609    if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
610      var _getWindowSizes = getWindowSizes(),
611          height = _getWindowSizes.height,
612          width = _getWindowSizes.width;
613
614      boundaries.top += offsets.top - offsets.marginTop;
615      boundaries.bottom = height + offsets.top;
616      boundaries.left += offsets.left - offsets.marginLeft;
617      boundaries.right = width + offsets.left;
618    } else {
619      // for all the other DOM elements, this one is good
620      boundaries = offsets;
621    }
622  }
623
624  // Add paddings
625  boundaries.left += padding;
626  boundaries.top += padding;
627  boundaries.right -= padding;
628  boundaries.bottom -= padding;
629
630  return boundaries;
631}
632
633function getArea(_ref) {
634  var width = _ref.width,
635      height = _ref.height;
636
637  return width * height;
638}
639
640/**
641 * Utility used to transform the `auto` placement to the placement with more
642 * available space.
643 * @method
644 * @memberof Popper.Utils
645 * @argument {Object} data - The data object generated by update method
646 * @argument {Object} options - Modifiers configuration and options
647 * @returns {Object} The data object, properly modified
648 */
649function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
650  var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
651
652  if (placement.indexOf('auto') === -1) {
653    return placement;
654  }
655
656  var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
657
658  var rects = {
659    top: {
660      width: boundaries.width,
661      height: refRect.top - boundaries.top
662    },
663    right: {
664      width: boundaries.right - refRect.right,
665      height: boundaries.height
666    },
667    bottom: {
668      width: boundaries.width,
669      height: boundaries.bottom - refRect.bottom
670    },
671    left: {
672      width: refRect.left - boundaries.left,
673      height: boundaries.height
674    }
675  };
676
677  var sortedAreas = Object.keys(rects).map(function (key) {
678    return _extends({
679      key: key
680    }, rects[key], {
681      area: getArea(rects[key])
682    });
683  }).sort(function (a, b) {
684    return b.area - a.area;
685  });
686
687  var filteredAreas = sortedAreas.filter(function (_ref2) {
688    var width = _ref2.width,
689        height = _ref2.height;
690    return width >= popper.clientWidth && height >= popper.clientHeight;
691  });
692
693  var computedPlacement = filteredAreas.length > 0 ? filteredAreas[0].key : sortedAreas[0].key;
694
695  var variation = placement.split('-')[1];
696
697  return computedPlacement + (variation ? '-' + variation : '');
698}
699
700/**
701 * Get offsets to the reference element
702 * @method
703 * @memberof Popper.Utils
704 * @param {Object} state
705 * @param {Element} popper - the popper element
706 * @param {Element} reference - the reference element (the popper will be relative to this)
707 * @returns {Object} An object containing the offsets which will be applied to the popper
708 */
709function getReferenceOffsets(state, popper, reference) {
710  var commonOffsetParent = findCommonOffsetParent(popper, reference);
711  return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent);
712}
713
714/**
715 * Get the outer sizes of the given element (offset size + margins)
716 * @method
717 * @memberof Popper.Utils
718 * @argument {Element} element
719 * @returns {Object} object containing width and height properties
720 */
721function getOuterSizes(element) {
722  var styles = window.getComputedStyle(element);
723  var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);
724  var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);
725  var result = {
726    width: element.offsetWidth + y,
727    height: element.offsetHeight + x
728  };
729  return result;
730}
731
732/**
733 * Get the opposite placement of the given one
734 * @method
735 * @memberof Popper.Utils
736 * @argument {String} placement
737 * @returns {String} flipped placement
738 */
739function getOppositePlacement(placement) {
740  var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
741  return placement.replace(/left|right|bottom|top/g, function (matched) {
742    return hash[matched];
743  });
744}
745
746/**
747 * Get offsets to the popper
748 * @method
749 * @memberof Popper.Utils
750 * @param {Object} position - CSS position the Popper will get applied
751 * @param {HTMLElement} popper - the popper element
752 * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
753 * @param {String} placement - one of the valid placement options
754 * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
755 */
756function getPopperOffsets(popper, referenceOffsets, placement) {
757  placement = placement.split('-')[0];
758
759  // Get popper node sizes
760  var popperRect = getOuterSizes(popper);
761
762  // Add position, width and height to our offsets object
763  var popperOffsets = {
764    width: popperRect.width,
765    height: popperRect.height
766  };
767
768  // depending by the popper placement we have to compute its offsets slightly differently
769  var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
770  var mainSide = isHoriz ? 'top' : 'left';
771  var secondarySide = isHoriz ? 'left' : 'top';
772  var measurement = isHoriz ? 'height' : 'width';
773  var secondaryMeasurement = !isHoriz ? 'height' : 'width';
774
775  popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
776  if (placement === secondarySide) {
777    popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
778  } else {
779    popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
780  }
781
782  return popperOffsets;
783}
784
785/**
786 * Mimics the `find` method of Array
787 * @method
788 * @memberof Popper.Utils
789 * @argument {Array} arr
790 * @argument prop
791 * @argument value
792 * @returns index or -1
793 */
794function find(arr, check) {
795  // use native find if supported
796  if (Array.prototype.find) {
797    return arr.find(check);
798  }
799
800  // use `filter` to obtain the same behavior of `find`
801  return arr.filter(check)[0];
802}
803
804/**
805 * Return the index of the matching object
806 * @method
807 * @memberof Popper.Utils
808 * @argument {Array} arr
809 * @argument prop
810 * @argument value
811 * @returns index or -1
812 */
813function findIndex(arr, prop, value) {
814  // use native findIndex if supported
815  if (Array.prototype.findIndex) {
816    return arr.findIndex(function (cur) {
817      return cur[prop] === value;
818    });
819  }
820
821  // use `find` + `indexOf` if `findIndex` isn't supported
822  var match = find(arr, function (obj) {
823    return obj[prop] === value;
824  });
825  return arr.indexOf(match);
826}
827
828/**
829 * Loop trough the list of modifiers and run them in order,
830 * each of them will then edit the data object.
831 * @method
832 * @memberof Popper.Utils
833 * @param {dataObject} data
834 * @param {Array} modifiers
835 * @param {String} ends - Optional modifier name used as stopper
836 * @returns {dataObject}
837 */
838function runModifiers(modifiers, data, ends) {
839  var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
840
841  modifiersToRun.forEach(function (modifier) {
842    if (modifier.function) {
843      console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
844    }
845    var fn = modifier.function || modifier.fn;
846    if (modifier.enabled && isFunction(fn)) {
847      // Add properties to offsets to make them a complete clientRect object
848      // we do this before each modifier to make sure the previous one doesn't
849      // mess with these values
850      data.offsets.popper = getClientRect(data.offsets.popper);
851      data.offsets.reference = getClientRect(data.offsets.reference);
852
853      data = fn(data, modifier);
854    }
855  });
856
857  return data;
858}
859
860/**
861 * Updates the position of the popper, computing the new offsets and applying
862 * the new style.<br />
863 * Prefer `scheduleUpdate` over `update` because of performance reasons.
864 * @method
865 * @memberof Popper
866 */
867function update() {
868  // if popper is destroyed, don't perform any further update
869  if (this.state.isDestroyed) {
870    return;
871  }
872
873  var data = {
874    instance: this,
875    styles: {},
876    arrowStyles: {},
877    attributes: {},
878    flipped: false,
879    offsets: {}
880  };
881
882  // compute reference element offsets
883  data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference);
884
885  // compute auto placement, store placement inside the data object,
886  // modifiers will be able to edit `placement` if needed
887  // and refer to originalPlacement to know the original value
888  data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
889
890  // store the computed placement inside `originalPlacement`
891  data.originalPlacement = data.placement;
892
893  // compute the popper offsets
894  data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
895  data.offsets.popper.position = 'absolute';
896
897  // run the modifiers
898  data = runModifiers(this.modifiers, data);
899
900  // the first `update` will call `onCreate` callback
901  // the other ones will call `onUpdate` callback
902  if (!this.state.isCreated) {
903    this.state.isCreated = true;
904    this.options.onCreate(data);
905  } else {
906    this.options.onUpdate(data);
907  }
908}
909
910/**
911 * Helper used to know if the given modifier is enabled.
912 * @method
913 * @memberof Popper.Utils
914 * @returns {Boolean}
915 */
916function isModifierEnabled(modifiers, modifierName) {
917  return modifiers.some(function (_ref) {
918    var name = _ref.name,
919        enabled = _ref.enabled;
920    return enabled && name === modifierName;
921  });
922}
923
924/**
925 * Get the prefixed supported property name
926 * @method
927 * @memberof Popper.Utils
928 * @argument {String} property (camelCase)
929 * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
930 */
931function getSupportedPropertyName(property) {
932  var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
933  var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
934
935  for (var i = 0; i < prefixes.length - 1; i++) {
936    var prefix = prefixes[i];
937    var toCheck = prefix ? '' + prefix + upperProp : property;
938    if (typeof window.document.body.style[toCheck] !== 'undefined') {
939      return toCheck;
940    }
941  }
942  return null;
943}
944
945/**
946 * Destroy the popper
947 * @method
948 * @memberof Popper
949 */
950function destroy() {
951  this.state.isDestroyed = true;
952
953  // touch DOM only if `applyStyle` modifier is enabled
954  if (isModifierEnabled(this.modifiers, 'applyStyle')) {
955    this.popper.removeAttribute('x-placement');
956    this.popper.style.left = '';
957    this.popper.style.position = '';
958    this.popper.style.top = '';
959    this.popper.style[getSupportedPropertyName('transform')] = '';
960  }
961
962  this.disableEventListeners();
963
964  // remove the popper if user explicity asked for the deletion on destroy
965  // do not use `remove` because IE11 doesn't support it
966  if (this.options.removeOnDestroy) {
967    this.popper.parentNode.removeChild(this.popper);
968  }
969  return this;
970}
971
972function attachToScrollParents(scrollParent, event, callback, scrollParents) {
973  var isBody = scrollParent.nodeName === 'BODY';
974  var target = isBody ? window : scrollParent;
975  target.addEventListener(event, callback, { passive: true });
976
977  if (!isBody) {
978    attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
979  }
980  scrollParents.push(target);
981}
982
983/**
984 * Setup needed event listeners used to update the popper position
985 * @method
986 * @memberof Popper.Utils
987 * @private
988 */
989function setupEventListeners(reference, options, state, updateBound) {
990  // Resize event listener on window
991  state.updateBound = updateBound;
992  window.addEventListener('resize', state.updateBound, { passive: true });
993
994  // Scroll event listener on scroll parents
995  var scrollElement = getScrollParent(reference);
996  attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
997  state.scrollElement = scrollElement;
998  state.eventsEnabled = true;
999
1000  return state;
1001}
1002
1003/**
1004 * It will add resize/scroll events and start recalculating
1005 * position of the popper element when they are triggered.
1006 * @method
1007 * @memberof Popper
1008 */
1009function enableEventListeners() {
1010  if (!this.state.eventsEnabled) {
1011    this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
1012  }
1013}
1014
1015/**
1016 * Remove event listeners used to update the popper position
1017 * @method
1018 * @memberof Popper.Utils
1019 * @private
1020 */
1021function removeEventListeners(reference, state) {
1022  // Remove resize event listener on window
1023  window.removeEventListener('resize', state.updateBound);
1024
1025  // Remove scroll event listener on scroll parents
1026  state.scrollParents.forEach(function (target) {
1027    target.removeEventListener('scroll', state.updateBound);
1028  });
1029
1030  // Reset state
1031  state.updateBound = null;
1032  state.scrollParents = [];
1033  state.scrollElement = null;
1034  state.eventsEnabled = false;
1035  return state;
1036}
1037
1038/**
1039 * It will remove resize/scroll events and won't recalculate popper position
1040 * when they are triggered. It also won't trigger onUpdate callback anymore,
1041 * unless you call `update` method manually.
1042 * @method
1043 * @memberof Popper
1044 */
1045function disableEventListeners() {
1046  if (this.state.eventsEnabled) {
1047    window.cancelAnimationFrame(this.scheduleUpdate);
1048    this.state = removeEventListeners(this.reference, this.state);
1049  }
1050}
1051
1052/**
1053 * Tells if a given input is a number
1054 * @method
1055 * @memberof Popper.Utils
1056 * @param {*} input to check
1057 * @return {Boolean}
1058 */
1059function isNumeric(n) {
1060  return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
1061}
1062
1063/**
1064 * Set the style to the given popper
1065 * @method
1066 * @memberof Popper.Utils
1067 * @argument {Element} element - Element to apply the style to
1068 * @argument {Object} styles
1069 * Object with a list of properties and values which will be applied to the element
1070 */
1071function setStyles(element, styles) {
1072  Object.keys(styles).forEach(function (prop) {
1073    var unit = '';
1074    // add unit if the value is numeric and is one of the following
1075    if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
1076      unit = 'px';
1077    }
1078    element.style[prop] = styles[prop] + unit;
1079  });
1080}
1081
1082/**
1083 * Set the attributes to the given popper
1084 * @method
1085 * @memberof Popper.Utils
1086 * @argument {Element} element - Element to apply the attributes to
1087 * @argument {Object} styles
1088 * Object with a list of properties and values which will be applied to the element
1089 */
1090function setAttributes(element, attributes) {
1091  Object.keys(attributes).forEach(function (prop) {
1092    var value = attributes[prop];
1093    if (value !== false) {
1094      element.setAttribute(prop, attributes[prop]);
1095    } else {
1096      element.removeAttribute(prop);
1097    }
1098  });
1099}
1100
1101/**
1102 * @function
1103 * @memberof Modifiers
1104 * @argument {Object} data - The data object generated by `update` method
1105 * @argument {Object} data.styles - List of style properties - values to apply to popper element
1106 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
1107 * @argument {Object} options - Modifiers configuration and options
1108 * @returns {Object} The same data object
1109 */
1110function applyStyle(data) {
1111  // any property present in `data.styles` will be applied to the popper,
1112  // in this way we can make the 3rd party modifiers add custom styles to it
1113  // Be aware, modifiers could override the properties defined in the previous
1114  // lines of this modifier!
1115  setStyles(data.instance.popper, data.styles);
1116
1117  // any property present in `data.attributes` will be applied to the popper,
1118  // they will be set as HTML attributes of the element
1119  setAttributes(data.instance.popper, data.attributes);
1120
1121  // if arrowElement is defined and arrowStyles has some properties
1122  if (data.arrowElement && Object.keys(data.arrowStyles).length) {
1123    setStyles(data.arrowElement, data.arrowStyles);
1124  }
1125
1126  return data;
1127}
1128
1129/**
1130 * Set the x-placement attribute before everything else because it could be used
1131 * to add margins to the popper margins needs to be calculated to get the
1132 * correct popper offsets.
1133 * @method
1134 * @memberof Popper.modifiers
1135 * @param {HTMLElement} reference - The reference element used to position the popper
1136 * @param {HTMLElement} popper - The HTML element used as popper.
1137 * @param {Object} options - Popper.js options
1138 */
1139function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
1140  // compute reference element offsets
1141  var referenceOffsets = getReferenceOffsets(state, popper, reference);
1142
1143  // compute auto placement, store placement inside the data object,
1144  // modifiers will be able to edit `placement` if needed
1145  // and refer to originalPlacement to know the original value
1146  var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
1147
1148  popper.setAttribute('x-placement', placement);
1149
1150  // Apply `position` to popper before anything else because
1151  // without the position applied we can't guarantee correct computations
1152  setStyles(popper, { position: 'absolute' });
1153
1154  return options;
1155}
1156
1157/**
1158 * @function
1159 * @memberof Modifiers
1160 * @argument {Object} data - The data object generated by `update` method
1161 * @argument {Object} options - Modifiers configuration and options
1162 * @returns {Object} The data object, properly modified
1163 */
1164function computeStyle(data, options) {
1165  var x = options.x,
1166      y = options.y;
1167  var popper = data.offsets.popper;
1168
1169  // Remove this legacy support in Popper.js v2
1170
1171  var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
1172    return modifier.name === 'applyStyle';
1173  }).gpuAcceleration;
1174  if (legacyGpuAccelerationOption !== undefined) {
1175    console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
1176  }
1177  var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
1178
1179  var offsetParent = getOffsetParent(data.instance.popper);
1180  var offsetParentRect = getBoundingClientRect(offsetParent);
1181
1182  // Styles
1183  var styles = {
1184    position: popper.position
1185  };
1186
1187  // floor sides to avoid blurry text
1188  var offsets = {
1189    left: Math.floor(popper.left),
1190    top: Math.floor(popper.top),
1191    bottom: Math.floor(popper.bottom),
1192    right: Math.floor(popper.right)
1193  };
1194
1195  var sideA = x === 'bottom' ? 'top' : 'bottom';
1196  var sideB = y === 'right' ? 'left' : 'right';
1197
1198  // if gpuAcceleration is set to `true` and transform is supported,
1199  //  we use `translate3d` to apply the position to the popper we
1200  // automatically use the supported prefixed version if needed
1201  var prefixedProperty = getSupportedPropertyName('transform');
1202
1203  // now, let's make a step back and look at this code closely (wtf?)
1204  // If the content of the popper grows once it's been positioned, it
1205  // may happen that the popper gets misplaced because of the new content
1206  // overflowing its reference element
1207  // To avoid this problem, we provide two options (x and y), which allow
1208  // the consumer to define the offset origin.
1209  // If we position a popper on top of a reference element, we can set
1210  // `x` to `top` to make the popper grow towards its top instead of
1211  // its bottom.
1212  var left = void 0,
1213      top = void 0;
1214  if (sideA === 'bottom') {
1215    top = -offsetParentRect.height + offsets.bottom;
1216  } else {
1217    top = offsets.top;
1218  }
1219  if (sideB === 'right') {
1220    left = -offsetParentRect.width + offsets.right;
1221  } else {
1222    left = offsets.left;
1223  }
1224  if (gpuAcceleration && prefixedProperty) {
1225    styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
1226    styles[sideA] = 0;
1227    styles[sideB] = 0;
1228    styles.willChange = 'transform';
1229  } else {
1230    // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
1231    var invertTop = sideA === 'bottom' ? -1 : 1;
1232    var invertLeft = sideB === 'right' ? -1 : 1;
1233    styles[sideA] = top * invertTop;
1234    styles[sideB] = left * invertLeft;
1235    styles.willChange = sideA + ', ' + sideB;
1236  }
1237
1238  // Attributes
1239  var attributes = {
1240    'x-placement': data.placement
1241  };
1242
1243  // Update `data` attributes, styles and arrowStyles
1244  data.attributes = _extends({}, attributes, data.attributes);
1245  data.styles = _extends({}, styles, data.styles);
1246  data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);
1247
1248  return data;
1249}
1250
1251/**
1252 * Helper used to know if the given modifier depends from another one.<br />
1253 * It checks if the needed modifier is listed and enabled.
1254 * @method
1255 * @memberof Popper.Utils
1256 * @param {Array} modifiers - list of modifiers
1257 * @param {String} requestingName - name of requesting modifier
1258 * @param {String} requestedName - name of requested modifier
1259 * @returns {Boolean}
1260 */
1261function isModifierRequired(modifiers, requestingName, requestedName) {
1262  var requesting = find(modifiers, function (_ref) {
1263    var name = _ref.name;
1264    return name === requestingName;
1265  });
1266
1267  var isRequired = !!requesting && modifiers.some(function (modifier) {
1268    return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
1269  });
1270
1271  if (!isRequired) {
1272    var _requesting = '`' + requestingName + '`';
1273    var requested = '`' + requestedName + '`';
1274    console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
1275  }
1276  return isRequired;
1277}
1278
1279/**
1280 * @function
1281 * @memberof Modifiers
1282 * @argument {Object} data - The data object generated by update method
1283 * @argument {Object} options - Modifiers configuration and options
1284 * @returns {Object} The data object, properly modified
1285 */
1286function arrow(data, options) {
1287  // arrow depends on keepTogether in order to work
1288  if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
1289    return data;
1290  }
1291
1292  var arrowElement = options.element;
1293
1294  // if arrowElement is a string, suppose it's a CSS selector
1295  if (typeof arrowElement === 'string') {
1296    arrowElement = data.instance.popper.querySelector(arrowElement);
1297
1298    // if arrowElement is not found, don't run the modifier
1299    if (!arrowElement) {
1300      return data;
1301    }
1302  } else {
1303    // if the arrowElement isn't a query selector we must check that the
1304    // provided DOM node is child of its popper node
1305    if (!data.instance.popper.contains(arrowElement)) {
1306      console.warn('WARNING: `arrow.element` must be child of its popper element!');
1307      return data;
1308    }
1309  }
1310
1311  var placement = data.placement.split('-')[0];
1312  var _data$offsets = data.offsets,
1313      popper = _data$offsets.popper,
1314      reference = _data$offsets.reference;
1315
1316  var isVertical = ['left', 'right'].indexOf(placement) !== -1;
1317
1318  var len = isVertical ? 'height' : 'width';
1319  var sideCapitalized = isVertical ? 'Top' : 'Left';
1320  var side = sideCapitalized.toLowerCase();
1321  var altSide = isVertical ? 'left' : 'top';
1322  var opSide = isVertical ? 'bottom' : 'right';
1323  var arrowElementSize = getOuterSizes(arrowElement)[len];
1324
1325  //
1326  // extends keepTogether behavior making sure the popper and its
1327  // reference have enough pixels in conjuction
1328  //
1329
1330  // top/left side
1331  if (reference[opSide] - arrowElementSize < popper[side]) {
1332    data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
1333  }
1334  // bottom/right side
1335  if (reference[side] + arrowElementSize > popper[opSide]) {
1336    data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
1337  }
1338
1339  // compute center of the popper
1340  var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
1341
1342  // Compute the sideValue using the updated popper offsets
1343  // take popper margin in account because we don't have this info available
1344  var popperMarginSide = getStyleComputedProperty(data.instance.popper, 'margin' + sideCapitalized).replace('px', '');
1345  var sideValue = center - getClientRect(data.offsets.popper)[side] - popperMarginSide;
1346
1347  // prevent arrowElement from being placed not contiguously to its popper
1348  sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
1349
1350  data.arrowElement = arrowElement;
1351  data.offsets.arrow = {};
1352  data.offsets.arrow[side] = Math.round(sideValue);
1353  data.offsets.arrow[altSide] = ''; // make sure to unset any eventual altSide value from the DOM node
1354
1355  return data;
1356}
1357
1358/**
1359 * Get the opposite placement variation of the given one
1360 * @method
1361 * @memberof Popper.Utils
1362 * @argument {String} placement variation
1363 * @returns {String} flipped placement variation
1364 */
1365function getOppositeVariation(variation) {
1366  if (variation === 'end') {
1367    return 'start';
1368  } else if (variation === 'start') {
1369    return 'end';
1370  }
1371  return variation;
1372}
1373
1374/**
1375 * List of accepted placements to use as values of the `placement` option.<br />
1376 * Valid placements are:
1377 * - `auto`
1378 * - `top`
1379 * - `right`
1380 * - `bottom`
1381 * - `left`
1382 *
1383 * Each placement can have a variation from this list:
1384 * - `-start`
1385 * - `-end`
1386 *
1387 * Variations are interpreted easily if you think of them as the left to right
1388 * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
1389 * is right.<br />
1390 * Vertically (`left` and `right`), `start` is top and `end` is bottom.
1391 *
1392 * Some valid examples are:
1393 * - `top-end` (on top of reference, right aligned)
1394 * - `right-start` (on right of reference, top aligned)
1395 * - `bottom` (on bottom, centered)
1396 * - `auto-right` (on the side with more space available, alignment depends by placement)
1397 *
1398 * @static
1399 * @type {Array}
1400 * @enum {String}
1401 * @readonly
1402 * @method placements
1403 * @memberof Popper
1404 */
1405var 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'];
1406
1407// Get rid of `auto` `auto-start` and `auto-end`
1408var validPlacements = placements.slice(3);
1409
1410/**
1411 * Given an initial placement, returns all the subsequent placements
1412 * clockwise (or counter-clockwise).
1413 *
1414 * @method
1415 * @memberof Popper.Utils
1416 * @argument {String} placement - A valid placement (it accepts variations)
1417 * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
1418 * @returns {Array} placements including their variations
1419 */
1420function clockwise(placement) {
1421  var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
1422
1423  var index = validPlacements.indexOf(placement);
1424  var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
1425  return counter ? arr.reverse() : arr;
1426}
1427
1428var BEHAVIORS = {
1429  FLIP: 'flip',
1430  CLOCKWISE: 'clockwise',
1431  COUNTERCLOCKWISE: 'counterclockwise'
1432};
1433
1434/**
1435 * @function
1436 * @memberof Modifiers
1437 * @argument {Object} data - The data object generated by update method
1438 * @argument {Object} options - Modifiers configuration and options
1439 * @returns {Object} The data object, properly modified
1440 */
1441function flip(data, options) {
1442  // if `inner` modifier is enabled, we can't use the `flip` modifier
1443  if (isModifierEnabled(data.instance.modifiers, 'inner')) {
1444    return data;
1445  }
1446
1447  if (data.flipped && data.placement === data.originalPlacement) {
1448    // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
1449    return data;
1450  }
1451
1452  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement);
1453
1454  var placement = data.placement.split('-')[0];
1455  var placementOpposite = getOppositePlacement(placement);
1456  var variation = data.placement.split('-')[1] || '';
1457
1458  var flipOrder = [];
1459
1460  switch (options.behavior) {
1461    case BEHAVIORS.FLIP:
1462      flipOrder = [placement, placementOpposite];
1463      break;
1464    case BEHAVIORS.CLOCKWISE:
1465      flipOrder = clockwise(placement);
1466      break;
1467    case BEHAVIORS.COUNTERCLOCKWISE:
1468      flipOrder = clockwise(placement, true);
1469      break;
1470    default:
1471      flipOrder = options.behavior;
1472  }
1473
1474  flipOrder.forEach(function (step, index) {
1475    if (placement !== step || flipOrder.length === index + 1) {
1476      return data;
1477    }
1478
1479    placement = data.placement.split('-')[0];
1480    placementOpposite = getOppositePlacement(placement);
1481
1482    var popperOffsets = data.offsets.popper;
1483    var refOffsets = data.offsets.reference;
1484
1485    // using floor because the reference offsets may contain decimals we are not going to consider here
1486    var floor = Math.floor;
1487    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);
1488
1489    var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
1490    var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
1491    var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
1492    var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);
1493
1494    var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;
1495
1496    // flip the variation if required
1497    var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1498    var flippedVariation = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);
1499
1500    if (overlapsRef || overflowsBoundaries || flippedVariation) {
1501      // this boolean to detect any flip loop
1502      data.flipped = true;
1503
1504      if (overlapsRef || overflowsBoundaries) {
1505        placement = flipOrder[index + 1];
1506      }
1507
1508      if (flippedVariation) {
1509        variation = getOppositeVariation(variation);
1510      }
1511
1512      data.placement = placement + (variation ? '-' + variation : '');
1513
1514      // this object contains `position`, we want to preserve it along with
1515      // any additional property we may add in the future
1516      data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
1517
1518      data = runModifiers(data.instance.modifiers, data, 'flip');
1519    }
1520  });
1521  return data;
1522}
1523
1524/**
1525 * @function
1526 * @memberof Modifiers
1527 * @argument {Object} data - The data object generated by update method
1528 * @argument {Object} options - Modifiers configuration and options
1529 * @returns {Object} The data object, properly modified
1530 */
1531function keepTogether(data) {
1532  var _data$offsets = data.offsets,
1533      popper = _data$offsets.popper,
1534      reference = _data$offsets.reference;
1535
1536  var placement = data.placement.split('-')[0];
1537  var floor = Math.floor;
1538  var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1539  var side = isVertical ? 'right' : 'bottom';
1540  var opSide = isVertical ? 'left' : 'top';
1541  var measurement = isVertical ? 'width' : 'height';
1542
1543  if (popper[side] < floor(reference[opSide])) {
1544    data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
1545  }
1546  if (popper[opSide] > floor(reference[side])) {
1547    data.offsets.popper[opSide] = floor(reference[side]);
1548  }
1549
1550  return data;
1551}
1552
1553/**
1554 * Converts a string containing value + unit into a px value number
1555 * @function
1556 * @memberof {modifiers~offset}
1557 * @private
1558 * @argument {String} str - Value + unit string
1559 * @argument {String} measurement - `height` or `width`
1560 * @argument {Object} popperOffsets
1561 * @argument {Object} referenceOffsets
1562 * @returns {Number|String}
1563 * Value in pixels, or original string if no values were extracted
1564 */
1565function toValue(str, measurement, popperOffsets, referenceOffsets) {
1566  // separate value from unit
1567  var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
1568  var value = +split[1];
1569  var unit = split[2];
1570
1571  // If it's not a number it's an operator, I guess
1572  if (!value) {
1573    return str;
1574  }
1575
1576  if (unit.indexOf('%') === 0) {
1577    var element = void 0;
1578    switch (unit) {
1579      case '%p':
1580        element = popperOffsets;
1581        break;
1582      case '%':
1583      case '%r':
1584      default:
1585        element = referenceOffsets;
1586    }
1587
1588    var rect = getClientRect(element);
1589    return rect[measurement] / 100 * value;
1590  } else if (unit === 'vh' || unit === 'vw') {
1591    // if is a vh or vw, we calculate the size based on the viewport
1592    var size = void 0;
1593    if (unit === 'vh') {
1594      size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
1595    } else {
1596      size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
1597    }
1598    return size / 100 * value;
1599  } else {
1600    // if is an explicit pixel unit, we get rid of the unit and keep the value
1601    // if is an implicit unit, it's px, and we return just the value
1602    return value;
1603  }
1604}
1605
1606/**
1607 * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
1608 * @function
1609 * @memberof {modifiers~offset}
1610 * @private
1611 * @argument {String} offset
1612 * @argument {Object} popperOffsets
1613 * @argument {Object} referenceOffsets
1614 * @argument {String} basePlacement
1615 * @returns {Array} a two cells array with x and y offsets in numbers
1616 */
1617function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
1618  var offsets = [0, 0];
1619
1620  // Use height if placement is left or right and index is 0 otherwise use width
1621  // in this way the first offset will use an axis and the second one
1622  // will use the other one
1623  var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
1624
1625  // Split the offset string to obtain a list of values and operands
1626  // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
1627  var fragments = offset.split(/(\+|\-)/).map(function (frag) {
1628    return frag.trim();
1629  });
1630
1631  // Detect if the offset string contains a pair of values or a single one
1632  // they could be separated by comma or space
1633  var divider = fragments.indexOf(find(fragments, function (frag) {
1634    return frag.search(/,|\s/) !== -1;
1635  }));
1636
1637  if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
1638    console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
1639  }
1640
1641  // If divider is found, we divide the list of values and operands to divide
1642  // them by ofset X and Y.
1643  var splitRegex = /\s*,\s*|\s+/;
1644  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];
1645
1646  // Convert the values with units to absolute pixels to allow our computations
1647  ops = ops.map(function (op, index) {
1648    // Most of the units rely on the orientation of the popper
1649    var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
1650    var mergeWithPrevious = false;
1651    return op
1652    // This aggregates any `+` or `-` sign that aren't considered operators
1653    // e.g.: 10 + +5 => [10, +, +5]
1654    .reduce(function (a, b) {
1655      if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
1656        a[a.length - 1] = b;
1657        mergeWithPrevious = true;
1658        return a;
1659      } else if (mergeWithPrevious) {
1660        a[a.length - 1] += b;
1661        mergeWithPrevious = false;
1662        return a;
1663      } else {
1664        return a.concat(b);
1665      }
1666    }, [])
1667    // Here we convert the string values into number values (in px)
1668    .map(function (str) {
1669      return toValue(str, measurement, popperOffsets, referenceOffsets);
1670    });
1671  });
1672
1673  // Loop trough the offsets arrays and execute the operations
1674  ops.forEach(function (op, index) {
1675    op.forEach(function (frag, index2) {
1676      if (isNumeric(frag)) {
1677        offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
1678      }
1679    });
1680  });
1681  return offsets;
1682}
1683
1684/**
1685 * @function
1686 * @memberof Modifiers
1687 * @argument {Object} data - The data object generated by update method
1688 * @argument {Object} options - Modifiers configuration and options
1689 * @argument {Number|String} options.offset=0
1690 * The offset value as described in the modifier description
1691 * @returns {Object} The data object, properly modified
1692 */
1693function offset(data, _ref) {
1694  var offset = _ref.offset;
1695  var placement = data.placement,
1696      _data$offsets = data.offsets,
1697      popper = _data$offsets.popper,
1698      reference = _data$offsets.reference;
1699
1700  var basePlacement = placement.split('-')[0];
1701
1702  var offsets = void 0;
1703  if (isNumeric(+offset)) {
1704    offsets = [+offset, 0];
1705  } else {
1706    offsets = parseOffset(offset, popper, reference, basePlacement);
1707  }
1708
1709  if (basePlacement === 'left') {
1710    popper.top += offsets[0];
1711    popper.left -= offsets[1];
1712  } else if (basePlacement === 'right') {
1713    popper.top += offsets[0];
1714    popper.left += offsets[1];
1715  } else if (basePlacement === 'top') {
1716    popper.left += offsets[0];
1717    popper.top -= offsets[1];
1718  } else if (basePlacement === 'bottom') {
1719    popper.left += offsets[0];
1720    popper.top += offsets[1];
1721  }
1722
1723  data.popper = popper;
1724  return data;
1725}
1726
1727/**
1728 * @function
1729 * @memberof Modifiers
1730 * @argument {Object} data - The data object generated by `update` method
1731 * @argument {Object} options - Modifiers configuration and options
1732 * @returns {Object} The data object, properly modified
1733 */
1734function preventOverflow(data, options) {
1735  var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
1736
1737  // If offsetParent is the reference element, we really want to
1738  // go one step up and use the next offsetParent as reference to
1739  // avoid to make this modifier completely useless and look like broken
1740  if (data.instance.reference === boundariesElement) {
1741    boundariesElement = getOffsetParent(boundariesElement);
1742  }
1743
1744  var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement);
1745  options.boundaries = boundaries;
1746
1747  var order = options.priority;
1748  var popper = data.offsets.popper;
1749
1750  var check = {
1751    primary: function primary(placement) {
1752      var value = popper[placement];
1753      if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
1754        value = Math.max(popper[placement], boundaries[placement]);
1755      }
1756      return defineProperty({}, placement, value);
1757    },
1758    secondary: function secondary(placement) {
1759      var mainSide = placement === 'right' ? 'left' : 'top';
1760      var value = popper[mainSide];
1761      if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
1762        value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
1763      }
1764      return defineProperty({}, mainSide, value);
1765    }
1766  };
1767
1768  order.forEach(function (placement) {
1769    var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
1770    popper = _extends({}, popper, check[side](placement));
1771  });
1772
1773  data.offsets.popper = popper;
1774
1775  return data;
1776}
1777
1778/**
1779 * @function
1780 * @memberof Modifiers
1781 * @argument {Object} data - The data object generated by `update` method
1782 * @argument {Object} options - Modifiers configuration and options
1783 * @returns {Object} The data object, properly modified
1784 */
1785function shift(data) {
1786  var placement = data.placement;
1787  var basePlacement = placement.split('-')[0];
1788  var shiftvariation = placement.split('-')[1];
1789
1790  // if shift shiftvariation is specified, run the modifier
1791  if (shiftvariation) {
1792    var _data$offsets = data.offsets,
1793        reference = _data$offsets.reference,
1794        popper = _data$offsets.popper;
1795
1796    var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
1797    var side = isVertical ? 'left' : 'top';
1798    var measurement = isVertical ? 'width' : 'height';
1799
1800    var shiftOffsets = {
1801      start: defineProperty({}, side, reference[side]),
1802      end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
1803    };
1804
1805    data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
1806  }
1807
1808  return data;
1809}
1810
1811/**
1812 * @function
1813 * @memberof Modifiers
1814 * @argument {Object} data - The data object generated by update method
1815 * @argument {Object} options - Modifiers configuration and options
1816 * @returns {Object} The data object, properly modified
1817 */
1818function hide(data) {
1819  if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
1820    return data;
1821  }
1822
1823  var refRect = data.offsets.reference;
1824  var bound = find(data.instance.modifiers, function (modifier) {
1825    return modifier.name === 'preventOverflow';
1826  }).boundaries;
1827
1828  if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
1829    // Avoid unnecessary DOM access if visibility hasn't changed
1830    if (data.hide === true) {
1831      return data;
1832    }
1833
1834    data.hide = true;
1835    data.attributes['x-out-of-boundaries'] = '';
1836  } else {
1837    // Avoid unnecessary DOM access if visibility hasn't changed
1838    if (data.hide === false) {
1839      return data;
1840    }
1841
1842    data.hide = false;
1843    data.attributes['x-out-of-boundaries'] = false;
1844  }
1845
1846  return data;
1847}
1848
1849/**
1850 * @function
1851 * @memberof Modifiers
1852 * @argument {Object} data - The data object generated by `update` method
1853 * @argument {Object} options - Modifiers configuration and options
1854 * @returns {Object} The data object, properly modified
1855 */
1856function inner(data) {
1857  var placement = data.placement;
1858  var basePlacement = placement.split('-')[0];
1859  var _data$offsets = data.offsets,
1860      popper = _data$offsets.popper,
1861      reference = _data$offsets.reference;
1862
1863  var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
1864
1865  var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
1866
1867  popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
1868
1869  data.placement = getOppositePlacement(placement);
1870  data.offsets.popper = getClientRect(popper);
1871
1872  return data;
1873}
1874
1875/**
1876 * Modifier function, each modifier can have a function of this type assigned
1877 * to its `fn` property.<br />
1878 * These functions will be called on each update, this means that you must
1879 * make sure they are performant enough to avoid performance bottlenecks.
1880 *
1881 * @function ModifierFn
1882 * @argument {dataObject} data - The data object generated by `update` method
1883 * @argument {Object} options - Modifiers configuration and options
1884 * @returns {dataObject} The data object, properly modified
1885 */
1886
1887/**
1888 * Modifiers are plugins used to alter the behavior of your poppers.<br />
1889 * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
1890 * needed by the library.
1891 *
1892 * Usually you don't want to override the `order`, `fn` and `onLoad` props.
1893 * All the other properties are configurations that could be tweaked.
1894 * @namespace modifiers
1895 */
1896var modifiers = {
1897  /**
1898   * Modifier used to shift the popper on the start or end of its reference
1899   * element.<br />
1900   * It will read the variation of the `placement` property.<br />
1901   * It can be one either `-end` or `-start`.
1902   * @memberof modifiers
1903   * @inner
1904   */
1905  shift: {
1906    /** @prop {number} order=100 - Index used to define the order of execution */
1907    order: 100,
1908    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
1909    enabled: true,
1910    /** @prop {ModifierFn} */
1911    fn: shift
1912  },
1913
1914  /**
1915   * The `offset` modifier can shift your popper on both its axis.
1916   *
1917   * It accepts the following units:
1918   * - `px` or unitless, interpreted as pixels
1919   * - `%` or `%r`, percentage relative to the length of the reference element
1920   * - `%p`, percentage relative to the length of the popper element
1921   * - `vw`, CSS viewport width unit
1922   * - `vh`, CSS viewport height unit
1923   *
1924   * For length is intended the main axis relative to the placement of the popper.<br />
1925   * This means that if the placement is `top` or `bottom`, the length will be the
1926   * `width`. In case of `left` or `right`, it will be the height.
1927   *
1928   * You can provide a single value (as `Number` or `String`), or a pair of values
1929   * as `String` divided by a comma or one (or more) white spaces.<br />
1930   * The latter is a deprecated method because it leads to confusion and will be
1931   * removed in v2.<br />
1932   * Additionally, it accepts additions and subtractions between different units.
1933   * Note that multiplications and divisions aren't supported.
1934   *
1935   * Valid examples are:
1936   * ```
1937   * 10
1938   * '10%'
1939   * '10, 10'
1940   * '10%, 10'
1941   * '10 + 10%'
1942   * '10 - 5vh + 3%'
1943   * '-10px + 5vh, 5px - 6%'
1944   * ```
1945   * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap
1946   * > with their reference element, unfortunately, you will have to disable the `flip` modifier.
1947   * > More on this [reading this issue](https://github.com/FezVrasta/popper.js/issues/373)
1948   *
1949   * @memberof modifiers
1950   * @inner
1951   */
1952  offset: {
1953    /** @prop {number} order=200 - Index used to define the order of execution */
1954    order: 200,
1955    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
1956    enabled: true,
1957    /** @prop {ModifierFn} */
1958    fn: offset,
1959    /** @prop {Number|String} offset=0
1960     * The offset value as described in the modifier description
1961     */
1962    offset: 0
1963  },
1964
1965  /**
1966   * Modifier used to prevent the popper from being positioned outside the boundary.
1967   *
1968   * An scenario exists where the reference itself is not within the boundaries.<br />
1969   * We can say it has "escaped the boundaries" — or just "escaped".<br />
1970   * In this case we need to decide whether the popper should either:
1971   *
1972   * - detach from the reference and remain "trapped" in the boundaries, or
1973   * - if it should ignore the boundary and "escape with its reference"
1974   *
1975   * When `escapeWithReference` is set to`true` and reference is completely
1976   * outside its boundaries, the popper will overflow (or completely leave)
1977   * the boundaries in order to remain attached to the edge of the reference.
1978   *
1979   * @memberof modifiers
1980   * @inner
1981   */
1982  preventOverflow: {
1983    /** @prop {number} order=300 - Index used to define the order of execution */
1984    order: 300,
1985    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
1986    enabled: true,
1987    /** @prop {ModifierFn} */
1988    fn: preventOverflow,
1989    /**
1990     * @prop {Array} [priority=['left','right','top','bottom']]
1991     * Popper will try to prevent overflow following these priorities by default,
1992     * then, it could overflow on the left and on top of the `boundariesElement`
1993     */
1994    priority: ['left', 'right', 'top', 'bottom'],
1995    /**
1996     * @prop {number} padding=5
1997     * Amount of pixel used to define a minimum distance between the boundaries
1998     * and the popper this makes sure the popper has always a little padding
1999     * between the edges of its container
2000     */
2001    padding: 5,
2002    /**
2003     * @prop {String|HTMLElement} boundariesElement='scrollParent'
2004     * Boundaries used by the modifier, can be `scrollParent`, `window`,
2005     * `viewport` or any DOM element.
2006     */
2007    boundariesElement: 'scrollParent'
2008  },
2009
2010  /**
2011   * Modifier used to make sure the reference and its popper stay near eachothers
2012   * without leaving any gap between the two. Expecially useful when the arrow is
2013   * enabled and you want to assure it to point to its reference element.
2014   * It cares only about the first axis, you can still have poppers with margin
2015   * between the popper and its reference element.
2016   * @memberof modifiers
2017   * @inner
2018   */
2019  keepTogether: {
2020    /** @prop {number} order=400 - Index used to define the order of execution */
2021    order: 400,
2022    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2023    enabled: true,
2024    /** @prop {ModifierFn} */
2025    fn: keepTogether
2026  },
2027
2028  /**
2029   * This modifier is used to move the `arrowElement` of the popper to make
2030   * sure it is positioned between the reference element and its popper element.
2031   * It will read the outer size of the `arrowElement` node to detect how many
2032   * pixels of conjuction are needed.
2033   *
2034   * It has no effect if no `arrowElement` is provided.
2035   * @memberof modifiers
2036   * @inner
2037   */
2038  arrow: {
2039    /** @prop {number} order=500 - Index used to define the order of execution */
2040    order: 500,
2041    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2042    enabled: true,
2043    /** @prop {ModifierFn} */
2044    fn: arrow,
2045    /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */
2046    element: '[x-arrow]'
2047  },
2048
2049  /**
2050   * Modifier used to flip the popper's placement when it starts to overlap its
2051   * reference element.
2052   *
2053   * Requires the `preventOverflow` modifier before it in order to work.
2054   *
2055   * **NOTE:** this modifier will interrupt the current update cycle and will
2056   * restart it if it detects the need to flip the placement.
2057   * @memberof modifiers
2058   * @inner
2059   */
2060  flip: {
2061    /** @prop {number} order=600 - Index used to define the order of execution */
2062    order: 600,
2063    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2064    enabled: true,
2065    /** @prop {ModifierFn} */
2066    fn: flip,
2067    /**
2068     * @prop {String|Array} behavior='flip'
2069     * The behavior used to change the popper's placement. It can be one of
2070     * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid
2071     * placements (with optional variations).
2072     */
2073    behavior: 'flip',
2074    /**
2075     * @prop {number} padding=5
2076     * The popper will flip if it hits the edges of the `boundariesElement`
2077     */
2078    padding: 5,
2079    /**
2080     * @prop {String|HTMLElement} boundariesElement='viewport'
2081     * The element which will define the boundaries of the popper position,
2082     * the popper will never be placed outside of the defined boundaries
2083     * (except if keepTogether is enabled)
2084     */
2085    boundariesElement: 'viewport'
2086  },
2087
2088  /**
2089   * Modifier used to make the popper flow toward the inner of the reference element.
2090   * By default, when this modifier is disabled, the popper will be placed outside
2091   * the reference element.
2092   * @memberof modifiers
2093   * @inner
2094   */
2095  inner: {
2096    /** @prop {number} order=700 - Index used to define the order of execution */
2097    order: 700,
2098    /** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */
2099    enabled: false,
2100    /** @prop {ModifierFn} */
2101    fn: inner
2102  },
2103
2104  /**
2105   * Modifier used to hide the popper when its reference element is outside of the
2106   * popper boundaries. It will set a `x-out-of-boundaries` attribute which can
2107   * be used to hide with a CSS selector the popper when its reference is
2108   * out of boundaries.
2109   *
2110   * Requires the `preventOverflow` modifier before it in order to work.
2111   * @memberof modifiers
2112   * @inner
2113   */
2114  hide: {
2115    /** @prop {number} order=800 - Index used to define the order of execution */
2116    order: 800,
2117    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2118    enabled: true,
2119    /** @prop {ModifierFn} */
2120    fn: hide
2121  },
2122
2123  /**
2124   * Computes the style that will be applied to the popper element to gets
2125   * properly positioned.
2126   *
2127   * Note that this modifier will not touch the DOM, it just prepares the styles
2128   * so that `applyStyle` modifier can apply it. This separation is useful
2129   * in case you need to replace `applyStyle` with a custom implementation.
2130   *
2131   * This modifier has `850` as `order` value to maintain backward compatibility
2132   * with previous versions of Popper.js. Expect the modifiers ordering method
2133   * to change in future major versions of the library.
2134   *
2135   * @memberof modifiers
2136   * @inner
2137   */
2138  computeStyle: {
2139    /** @prop {number} order=850 - Index used to define the order of execution */
2140    order: 850,
2141    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2142    enabled: true,
2143    /** @prop {ModifierFn} */
2144    fn: computeStyle,
2145    /**
2146     * @prop {Boolean} gpuAcceleration=true
2147     * If true, it uses the CSS 3d transformation to position the popper.
2148     * Otherwise, it will use the `top` and `left` properties.
2149     */
2150    gpuAcceleration: true,
2151    /**
2152     * @prop {string} [x='bottom']
2153     * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.
2154     * Change this if your popper should grow in a direction different from `bottom`
2155     */
2156    x: 'bottom',
2157    /**
2158     * @prop {string} [x='left']
2159     * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.
2160     * Change this if your popper should grow in a direction different from `right`
2161     */
2162    y: 'right'
2163  },
2164
2165  /**
2166   * Applies the computed styles to the popper element.
2167   *
2168   * All the DOM manipulations are limited to this modifier. This is useful in case
2169   * you want to integrate Popper.js inside a framework or view library and you
2170   * want to delegate all the DOM manipulations to it.
2171   *
2172   * Note that if you disable this modifier, you must make sure the popper element
2173   * has its position set to `absolute` before Popper.js can do its work!
2174   *
2175   * Just disable this modifier and define you own to achieve the desired effect.
2176   *
2177   * @memberof modifiers
2178   * @inner
2179   */
2180  applyStyle: {
2181    /** @prop {number} order=900 - Index used to define the order of execution */
2182    order: 900,
2183    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2184    enabled: true,
2185    /** @prop {ModifierFn} */
2186    fn: applyStyle,
2187    /** @prop {Function} */
2188    onLoad: applyStyleOnLoad,
2189    /**
2190     * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
2191     * @prop {Boolean} gpuAcceleration=true
2192     * If true, it uses the CSS 3d transformation to position the popper.
2193     * Otherwise, it will use the `top` and `left` properties.
2194     */
2195    gpuAcceleration: undefined
2196  }
2197};
2198
2199/**
2200 * The `dataObject` is an object containing all the informations used by Popper.js
2201 * this object get passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
2202 * @name dataObject
2203 * @property {Object} data.instance The Popper.js instance
2204 * @property {String} data.placement Placement applied to popper
2205 * @property {String} data.originalPlacement Placement originally defined on init
2206 * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
2207 * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper.
2208 * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
2209 * @property {Object} data.styles Any CSS property defined here will be applied to the popper, it expects the JavaScript nomenclature (eg. `marginBottom`)
2210 * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow, it expects the JavaScript nomenclature (eg. `marginBottom`)
2211 * @property {Object} data.boundaries Offsets of the popper boundaries
2212 * @property {Object} data.offsets The measurements of popper, reference and arrow elements.
2213 * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
2214 * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
2215 * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
2216 */
2217
2218/**
2219 * Default options provided to Popper.js constructor.<br />
2220 * These can be overriden using the `options` argument of Popper.js.<br />
2221 * To override an option, simply pass as 3rd argument an object with the same
2222 * structure of this object, example:
2223 * ```
2224 * new Popper(ref, pop, {
2225 *   modifiers: {
2226 *     preventOverflow: { enabled: false }
2227 *   }
2228 * })
2229 * ```
2230 * @type {Object}
2231 * @static
2232 * @memberof Popper
2233 */
2234var Defaults = {
2235  /**
2236   * Popper's placement
2237   * @prop {Popper.placements} placement='bottom'
2238   */
2239  placement: 'bottom',
2240
2241  /**
2242   * Whether events (resize, scroll) are initially enabled
2243   * @prop {Boolean} eventsEnabled=true
2244   */
2245  eventsEnabled: true,
2246
2247  /**
2248   * Set to true if you want to automatically remove the popper when
2249   * you call the `destroy` method.
2250   * @prop {Boolean} removeOnDestroy=false
2251   */
2252  removeOnDestroy: false,
2253
2254  /**
2255   * Callback called when the popper is created.<br />
2256   * By default, is set to no-op.<br />
2257   * Access Popper.js instance with `data.instance`.
2258   * @prop {onCreate}
2259   */
2260  onCreate: function onCreate() {},
2261
2262  /**
2263   * Callback called when the popper is updated, this callback is not called
2264   * on the initialization/creation of the popper, but only on subsequent
2265   * updates.<br />
2266   * By default, is set to no-op.<br />
2267   * Access Popper.js instance with `data.instance`.
2268   * @prop {onUpdate}
2269   */
2270  onUpdate: function onUpdate() {},
2271
2272  /**
2273   * List of modifiers used to modify the offsets before they are applied to the popper.
2274   * They provide most of the functionalities of Popper.js
2275   * @prop {modifiers}
2276   */
2277  modifiers: modifiers
2278};
2279
2280/**
2281 * @callback onCreate
2282 * @param {dataObject} data
2283 */
2284
2285/**
2286 * @callback onUpdate
2287 * @param {dataObject} data
2288 */
2289
2290// Utils
2291// Methods
2292var Popper = function () {
2293  /**
2294   * Create a new Popper.js instance
2295   * @class Popper
2296   * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper
2297   * @param {HTMLElement} popper - The HTML element used as popper.
2298   * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
2299   * @return {Object} instance - The generated Popper.js instance
2300   */
2301  function Popper(reference, popper) {
2302    var _this = this;
2303
2304    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
2305    classCallCheck(this, Popper);
2306
2307    this.scheduleUpdate = function () {
2308      return requestAnimationFrame(_this.update);
2309    };
2310
2311    // make update() debounced, so that it only runs at most once-per-tick
2312    this.update = debounce(this.update.bind(this));
2313
2314    // with {} we create a new object with the options inside it
2315    this.options = _extends({}, Popper.Defaults, options);
2316
2317    // init state
2318    this.state = {
2319      isDestroyed: false,
2320      isCreated: false,
2321      scrollParents: []
2322    };
2323
2324    // get reference and popper elements (allow jQuery wrappers)
2325    this.reference = reference.jquery ? reference[0] : reference;
2326    this.popper = popper.jquery ? popper[0] : popper;
2327
2328    // Deep merge modifiers options
2329    this.options.modifiers = {};
2330    Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {
2331      _this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
2332    });
2333
2334    // Refactoring modifiers' list (Object => Array)
2335    this.modifiers = Object.keys(this.options.modifiers).map(function (name) {
2336      return _extends({
2337        name: name
2338      }, _this.options.modifiers[name]);
2339    })
2340    // sort the modifiers by order
2341    .sort(function (a, b) {
2342      return a.order - b.order;
2343    });
2344
2345    // modifiers have the ability to execute arbitrary code when Popper.js get inited
2346    // such code is executed in the same order of its modifier
2347    // they could add new properties to their options configuration
2348    // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
2349    this.modifiers.forEach(function (modifierOptions) {
2350      if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
2351        modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);
2352      }
2353    });
2354
2355    // fire the first update to position the popper in the right place
2356    this.update();
2357
2358    var eventsEnabled = this.options.eventsEnabled;
2359    if (eventsEnabled) {
2360      // setup event listeners, they will take care of update the position in specific situations
2361      this.enableEventListeners();
2362    }
2363
2364    this.state.eventsEnabled = eventsEnabled;
2365  }
2366
2367  // We can't use class properties because they don't get listed in the
2368  // class prototype and break stuff like Sinon stubs
2369
2370
2371  createClass(Popper, [{
2372    key: 'update',
2373    value: function update$$1() {
2374      return update.call(this);
2375    }
2376  }, {
2377    key: 'destroy',
2378    value: function destroy$$1() {
2379      return destroy.call(this);
2380    }
2381  }, {
2382    key: 'enableEventListeners',
2383    value: function enableEventListeners$$1() {
2384      return enableEventListeners.call(this);
2385    }
2386  }, {
2387    key: 'disableEventListeners',
2388    value: function disableEventListeners$$1() {
2389      return disableEventListeners.call(this);
2390    }
2391
2392    /**
2393     * Schedule an update, it will run on the next UI update available
2394     * @method scheduleUpdate
2395     * @memberof Popper
2396     */
2397
2398
2399    /**
2400     * Collection of utilities useful when writing custom modifiers.
2401     * Starting from version 1.7, this method is available only if you
2402     * include `popper-utils.js` before `popper.js`.
2403     *
2404     * **DEPRECATION**: This way to access PopperUtils is deprecated
2405     * and will be removed in v2! Use the PopperUtils module directly instead.
2406     * Due to the high instability of the methods contained in Utils, we can't
2407     * guarantee them to follow semver. Use them at your own risk!
2408     * @static
2409     * @private
2410     * @type {Object}
2411     * @deprecated since version 1.8
2412     * @member Utils
2413     * @memberof Popper
2414     */
2415
2416  }]);
2417  return Popper;
2418}();
2419
2420/**
2421 * The `referenceObject` is an object that provides an interface compatible with Popper.js
2422 * and lets you use it as replacement of a real DOM node.<br />
2423 * You can use this method to position a popper relatively to a set of coordinates
2424 * in case you don't have a DOM node to use as reference.
2425 *
2426 * ```
2427 * new Popper(referenceObject, popperNode);
2428 * ```
2429 *
2430 * NB: This feature isn't supported in Internet Explorer 10
2431 * @name referenceObject
2432 * @property {Function} data.getBoundingClientRect
2433 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
2434 * @property {number} data.clientWidth
2435 * An ES6 getter that will return the width of the virtual reference element.
2436 * @property {number} data.clientHeight
2437 * An ES6 getter that will return the height of the virtual reference element.
2438 */
2439
2440
2441Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
2442Popper.placements = placements;
2443Popper.Defaults = Defaults;
2444
2445return Popper;
2446
2447})));
2448//# sourceMappingURL=popper.js.map
2449