https://global.canon/01cmn/isfw/isfw_assets/lib/popper.js

1/**!
2 * @fileOverview Kickass library to create and place poppers near their reference elements.
3 * @version 1.12.9
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 isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined';
32var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
33var timeoutDuration = 0;
34for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
35  if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
36    timeoutDuration = 1;
37    break;
38  }
39}
40
41function microtaskDebounce(fn) {
42  var called = false;
43  return function () {
44    if (called) {
45      return;
46    }
47    called = true;
48    window.Promise.resolve().then(function () {
49      called = false;
50      fn();
51    });
52  };
53}
54
55function taskDebounce(fn) {
56  var scheduled = false;
57  return function () {
58    if (!scheduled) {
59      scheduled = true;
60      setTimeout(function () {
61        scheduled = false;
62        fn();
63      }, timeoutDuration);
64    }
65  };
66}
67
68var supportsMicroTasks = isBrowser && window.Promise;
69
70/**
71* Create a debounced version of a method, that's asynchronously deferred
72* but called in the minimum time possible.
73*
74* @method
75* @memberof Popper.Utils
76* @argument {Function} fn
77* @returns {Function}
78*/
79var debounce = supportsMicroTasks ? microtaskDebounce : taskDebounce;
80
81/**
82 * Check if the given variable is a function
83 * @method
84 * @memberof Popper.Utils
85 * @argument {Any} functionToCheck - variable to check
86 * @returns {Boolean} answer to: is a function?
87 */
88function isFunction(functionToCheck) {
89  var getType = {};
90  return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
91}
92
93/**
94 * Get CSS computed property of the given element
95 * @method
96 * @memberof Popper.Utils
97 * @argument {Eement} element
98 * @argument {String} property
99 */
100function getStyleComputedProperty(element, property) {
101  if (element.nodeType !== 1) {
102    return [];
103  }
104  // NOTE: 1 DOM access here
105  var css = getComputedStyle(element, null);
106  return property ? css[property] : css;
107}
108
109/**
110 * Returns the parentNode or the host of the element
111 * @method
112 * @memberof Popper.Utils
113 * @argument {Element} element
114 * @returns {Element} parent
115 */
116function getParentNode(element) {
117  if (element.nodeName === 'HTML') {
118    return element;
119  }
120  return element.parentNode || element.host;
121}
122
123/**
124 * Returns the scrolling parent of the given element
125 * @method
126 * @memberof Popper.Utils
127 * @argument {Element} element
128 * @returns {Element} scroll parent
129 */
130function getScrollParent(element) {
131  // Return body, `getScroll` will take care to get the correct `scrollTop` from it
132  if (!element) {
133    return document.body;
134  }
135
136  switch (element.nodeName) {
137    case 'HTML':
138    case 'BODY':
139      return element.ownerDocument.body;
140    case '#document':
141      return element.body;
142  }
143
144  // Firefox want us to check `-x` and `-y` variations as well
145
146  var _getStyleComputedProp = getStyleComputedProperty(element),
147      overflow = _getStyleComputedProp.overflow,
148      overflowX = _getStyleComputedProp.overflowX,
149      overflowY = _getStyleComputedProp.overflowY;
150
151  if (/(auto|scroll)/.test(overflow + overflowY + overflowX)) {
152    return element;
153  }
154
155  return getScrollParent(getParentNode(element));
156}
157
158/**
159 * Returns the offset parent of the given element
160 * @method
161 * @memberof Popper.Utils
162 * @argument {Element} element
163 * @returns {Element} offset parent
164 */
165function getOffsetParent(element) {
166  // NOTE: 1 DOM access here
167  var offsetParent = element && element.offsetParent;

236  // Both nodes are inside #document
237
238  if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
239    if (isOffsetContainer(commonAncestorContainer)) {
240      return commonAncestorContainer;
241    }
242
243    return getOffsetParent(commonAncestorContainer);
244  }
245
246  // one of the nodes is inside shadowDOM, find which one
247  var element1root = getRoot(element1);
248  if (element1root.host) {
249    return findCommonOffsetParent(element1root.host, element2);
250  } else {
251    return findCommonOffsetParent(element1, getRoot(element2).host);
252  }
253}
254
255/**
256 * Gets the scroll value of the given element in the given side (top and left)
257 * @method
258 * @memberof Popper.Utils
259 * @argument {Element} element
260 * @argument {String} side `top` or `left`
261 * @returns {number} amount of scrolled pixels
262 */
263function getScroll(element) {
264  var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
265
266  var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
267  var nodeName = element.nodeName;
268
269  if (nodeName === 'BODY' || nodeName === 'HTML') {
270    var html = element.ownerDocument.documentElement;
271    var scrollingElement = element.ownerDocument.scrollingElement || html;
272    return scrollingElement[upperSide];
273  }
274
275  return element[upperSide];
276}
277
278/*
279 * Sum or subtract the element scroll values (left and top) from a given rect object
280 * @method
281 * @memberof Popper.Utils
282 * @param {Object} rect - Rect object you want to change
283 * @param {HTMLElement} element - The element from the function reads the scroll values
284 * @param {Boolean} subtract - set to true if you want to subtract the scroll values
285 * @return {Object} rect - The modifier rect object
286 */
287function includeScroll(rect, element) {
288  var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
289
290  var scrollTop = getScroll(element, 'top');
291  var scrollLeft = getScroll(element, 'left');
292  var modifier = subtract ? -1 : 1;
293  rect.top += scrollTop * modifier;
294  rect.bottom += scrollTop * modifier;
295  rect.left += scrollLeft * modifier;
296  rect.right += scrollLeft * modifier;
297  return rect;
298}
299
300/*
301 * Helper to detect borders of a given element
302 * @method
303 * @memberof Popper.Utils
304 * @param {CSSStyleDeclaration} styles
305 * Result of `getStyleComputedProperty` on the given element
306 * @param {String} axis - `x` or `y`
307 * @return {number} borders - The borders size of the given axis
308 */
309
310function getBordersSize(styles, axis) {
311  var sideA = axis === 'x' ? 'Left' : 'Top';
312  var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
313
314  return parseFloat(styles['border' + sideA + 'Width'], 10) + parseFloat(styles['border' + sideB + 'Width'], 10);
315}
316
317/**
318 * Tells if you are running Internet Explorer 10
319 * @method
320 * @memberof Popper.Utils
321 * @returns {Boolean} isIE10
322 */
323var isIE10 = undefined;
324
325var isIE10$1 = function () {
326  if (isIE10 === undefined) {
327    isIE10 = navigator.appVersion.indexOf('MSIE 10') !== -1;
328  }
329  return isIE10;
330};
331
332function getSize(axis, body, html, computedStyle) {
333  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);
334}
335
336function getWindowSizes() {
337  var body = document.body;
338  var html = document.documentElement;
339  var computedStyle = isIE10$1() && getComputedStyle(html);
340
341  return {
342    height: getSize('Height', body, html, computedStyle),
343    width: getSize('Width', body, html, computedStyle)
344  };
345}
346
347var classCallCheck = function (instance, Constructor) {
348  if (!(instance instanceof Constructor)) {
349    throw new TypeError("Cannot call a class as a function");
350  }
351};
352
353var createClass = function () {
354  function defineProperties(target, props) {
355    for (var i = 0; i < props.length; i++) {
356      var descriptor = props[i];
357      descriptor.enumerable = descriptor.enumerable || false;
358      descriptor.configurable = true;
359      if ("value" in descriptor) descriptor.writable = true;
360      Object.defineProperty(target, descriptor.key, descriptor);
361    }
362  }
363
364  return function (Constructor, protoProps, staticProps) {
365    if (protoProps) defineProperties(Constructor.prototype, protoProps);
366    if (staticProps) defineProperties(Constructor, staticProps);
367    return Constructor;
368  };
369}();
370
371
372
373
374
375var defineProperty = function (obj, key, value) {
376  if (key in obj) {
377    Object.defineProperty(obj, key, {
378      value: value,
379      enumerable: true,
380      configurable: true,
381      writable: true
382    });
383  } else {
384    obj[key] = value;
385  }
386
387  return obj;
388};
389
390var _extends = Object.assign || function (target) {
391  for (var i = 1; i < arguments.length; i++) {
392    var source = arguments[i];
393
394    for (var key in source) {
395      if (Object.prototype.hasOwnProperty.call(source, key)) {
396        target[key] = source[key];
397      }
398    }
399  }
400
401  return target;
402};
403
404/**
405 * Given element offsets, generate an output similar to getBoundingClientRect
406 * @method
407 * @memberof Popper.Utils
408 * @argument {Object} offsets
409 * @returns {Object} ClientRect like output
410 */
411function getClientRect(offsets) {
412  return _extends({}, offsets, {
413    right: offsets.left + offsets.width,
414    bottom: offsets.top + offsets.height
415  });
416}
417
418/**
419 * Get bounding client rect of given element
420 * @method
421 * @memberof Popper.Utils
422 * @param {HTMLElement} element
423 * @return {Object} client rect
424 */
425function getBoundingClientRect(element) {
426  var rect = {};
427
428  // IE10 10 FIX: Please, don't ask, the element isn't

550  }
551  if (getStyleComputedProperty(element, 'position') === 'fixed') {
552    return true;
553  }
554  return isFixed(getParentNode(element));
555}
556
557/**
558 * Computed the boundaries limits and return them
559 * @method
560 * @memberof Popper.Utils
561 * @param {HTMLElement} popper
562 * @param {HTMLElement} reference
563 * @param {number} padding
564 * @param {HTMLElement} boundariesElement - Element used to define the boundaries
565 * @returns {Object} Coordinates of the boundaries
566 */
567function getBoundaries(popper, reference, padding, boundariesElement) {
568  // NOTE: 1 DOM access here
569  var boundaries = { top: 0, left: 0 };
570  var offsetParent = findCommonOffsetParent(popper, reference);
571
572  // Handle viewport case
573  if (boundariesElement === 'viewport') {
574    boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent);
575  } else {
576    // Handle other cases based on DOM element used as boundaries
577    var boundariesNode = void 0;
578    if (boundariesElement === 'scrollParent') {
579      boundariesNode = getScrollParent(getParentNode(reference));
580      if (boundariesNode.nodeName === 'BODY') {
581        boundariesNode = popper.ownerDocument.documentElement;
582      }
583    } else if (boundariesElement === 'window') {
584      boundariesNode = popper.ownerDocument.documentElement;
585    } else {
586      boundariesNode = boundariesElement;
587    }
588
589    var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent);
590
591    // In case of HTML, we need a different computation
592    if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
593      var _getWindowSizes = getWindowSizes(),
594          height = _getWindowSizes.height,
595          width = _getWindowSizes.width;
596
597      boundaries.top += offsets.top - offsets.marginTop;
598      boundaries.bottom = height + offsets.top;
599      boundaries.left += offsets.left - offsets.marginLeft;
600      boundaries.right = width + offsets.left;
601    } else {
602      // for all the other DOM elements, this one is good
603      boundaries = offsets;
604    }
605  }
606
607  // Add paddings
608  boundaries.left += padding;
609  boundaries.top += padding;
610  boundaries.right -= padding;
611  boundaries.bottom -= padding;
612
613  return boundaries;
614}
615
616function getArea(_ref) {
617  var width = _ref.width,
618      height = _ref.height;
619
620  return width * height;
621}
622
623/**
624 * Utility used to transform the `auto` placement to the placement with more
625 * available space.
626 * @method
627 * @memberof Popper.Utils
628 * @argument {Object} data - The data object generated by update method
629 * @argument {Object} options - Modifiers configuration and options
630 * @returns {Object} The data object, properly modified
631 */
632function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
633  var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
634
635  if (placement.indexOf('auto') === -1) {
636    return placement;
637  }
638
639  var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
640
641  var rects = {
642    top: {
643      width: boundaries.width,
644      height: refRect.top - boundaries.top
645    },
646    right: {
647      width: boundaries.right - refRect.right,
648      height: boundaries.height
649    },
650    bottom: {
651      width: boundaries.width,
652      height: boundaries.bottom - refRect.bottom
653    },
654    left: {
655      width: refRect.left - boundaries.left,
656      height: boundaries.height
657    }
658  };
659
660  var sortedAreas = Object.keys(rects).map(function (key) {
661    return _extends({
662      key: key
663    }, rects[key], {
664      area: getArea(rects[key])
665    });
666  }).sort(function (a, b) {
667    return b.area - a.area;
668  });
669
670  var filteredAreas = sortedAreas.filter(function (_ref2) {
671    var width = _ref2.width,
672        height = _ref2.height;
673    return width >= popper.clientWidth && height >= popper.clientHeight;
674  });
675
676  var computedPlacement = filteredAreas.length > 0 ? filteredAreas[0].key : sortedAreas[0].key;
677
678  var variation = placement.split('-')[1];
679
680  return computedPlacement + (variation ? '-' + variation : '');
681}
682
683/**
684 * Get offsets to the reference element
685 * @method
686 * @memberof Popper.Utils
687 * @param {Object} state
688 * @param {Element} popper - the popper element
689 * @param {Element} reference - the reference element (the popper will be relative to this)
690 * @returns {Object}

690 An object containing the offsets which will be applied to the popper
691 */
692function getReferenceOffsets(state, popper, reference) {
693  var commonOffsetParent = findCommonOffsetParent(popper, reference);
694  return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent);
695}
696
697/**
698 * Get the outer sizes of the given element (offset size + margins)
699 * @method
700 * @memberof Popper.Utils
701 * @argument {Element} element
702 * @returns {Object} object containing width and height properties
703 */
704function getOuterSizes(element) {
705  var styles = getComputedStyle(element);
706  var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);
707  var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);
708  var result = {
709    width: element.offsetWidth + y,
710    height: element.offsetHeight + x
711  };
712  return result;
713}
714
715/**
716 * Get the opposite placement of the given one
717 * @method
718 * @memberof Popper.Utils
719 * @argument {String} placement
720 * @returns {String} flipped placement
721 */
722function getOppositePlacement(placement) {
723  var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
724  return placement.replace(/left|right|bottom|top/g, function (matched) {
725    return hash[matched];
726  });
727}
728
729/**
730 * Get offsets to the popper
731 * @method
732 * @memberof Popper.Utils
733 * @param {Object} position - CSS position the Popper will get applied
734 * @param {HTMLElement} popper - the popper element
735 * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
736 * @param {String} placement - one of the valid placement options
737 * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
738 */
739function getPopperOffsets(popper, referenceOffsets, placement) {
740  placement = placement.split('-')[0];
741
742  // Get popper node sizes
743  var popperRect = getOuterSizes(popper);
744
745  // Add position, width and height to our offsets object
746  var popperOffsets = {
747    width: popperRect.width,
748    height: popperRect.height
749  };
750
751  // depending by the popper placement we have to compute its offsets slightly differently
752  var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
753  var mainSide = isHoriz ? 'top' : 'left';
754  var secondarySide = isHoriz ? 'left' : 'top';
755  var measurement = isHoriz ? 'height' : 'width';
756  var secondaryMeasurement = !isHoriz ? 'height' : 'width';
757
758  popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
759  if (placement === secondarySide) {
760    popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
761  } else {
762    popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
763  }
764
765  return popperOffsets;
766}
767
768/**
769 * Mimics the `find` method of Array
770 * @method
771 * @memberof Popper.Utils
772 * @argument {Array} arr
773 * @argument prop
774 * @argument value
775 * @returns index or -1
776 */
777function find(arr, check) {
778  // use native find if supported
779  if (Array.prototype.find) {
780    return arr.find(check);
781  }
782
783  // use `filter` to obtain the same behavior of `find`
784  return arr.filter(check)[0];
785}
786
787/**
788 * Return the index of the matching object
789 * @method
790 * @memberof Popper.Utils
791 * @argument {Array} arr
792 * @argument prop
793 * @argument value
794 * @returns index or -1
795 */
796function findIndex(arr, prop, value) {
797  // use native findIndex if supported
798  if (Array.prototype.findIndex) {
799    return arr.findIndex(function (cur) {
800      return cur[prop] === value;
801    });
802  }
803
804  // use `find` + `indexOf` if `findIndex` isn't supported
805  var match = find(arr, function (obj) {
806    return obj[prop] === value;
807  });
808  return arr.indexOf(match);
809}
810
811/**
812 * Loop trough the list of modifiers and run them in order,
813 * each of them will then edit the data object.
814 * @method
815 * @memberof Popper.Utils
816 * @param {dataObject} data
817 * @param {Array} modifiers
818 * @param {String} ends - Optional modifier name used as stopper
819 * @returns {dataObject}
820 */
821function runModifiers(modifiers, data, ends) {
822  var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
823

824  modifiersToRun.forEach(function (modifier) {
825    if (modifier['function']) {
826      // eslint-disable-line dot-notation
827      console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
828    }
829    var fn = modifier['function'] || modifier.fn; // eslint-disable-line dot-notation
830    if (modifier.enabled && isFunction(fn)) {
831      // Add properties to offsets to make them a complete clientRect object
832      // we do this before each modifier to make sure the previous one doesn't
833      // mess with these values
834      data.offsets.popper = getClientRect(data.offsets.popper);
835      data.offsets.reference = getClientRect(data.offsets.reference);
836
837      data = fn(data, modifier);
838    }
839  });
840
841  return data;
842}
843
844/**
845 * Updates the position of the popper, computing the new offsets and applying
846 * the new style.<br />
847 * Prefer `scheduleUpdate` over `update` because of performance reasons.
848 * @method
849 * @memberof Popper
850 */
851function update() {
852  // if popper is destroyed, don't perform any further update
853  if (this.state.isDestroyed) {
854    return;
855  }
856
857  var data = {
858    instance: this,
859    styles: {},
860    arrowStyles: {},
861    attributes: {},
862    flipped: false,
863    offsets: {}
864  };
865
866  // compute reference element offsets
867  data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference);
868
869  // compute auto placement, store placement inside the data object,
870  // modifiers will be able to edit `placement` if needed
871  // and refer to originalPlacement to know the original value
872  data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
873
874  // store the computed placement inside `originalPlacement`
875  data.originalPlacement = data.placement;
876
877  // compute the popper offsets
878  data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
879  data.offsets.popper.position = 'absolute';
880
881  // run the modifiers
882  data = runModifiers(this.modifiers, data);
883
884  // the first `update` will call `onCreate` callback
885  // the other ones will call `onUpdate` callback
886  if (!this.state.isCreated) {
887    this.state.isCreated = true;
888    this.options.onCreate(data);
889  } else {
890    this.options.onUpdate(data);
891  }
892}
893
894/**
895 * Helper used to know if the given modifier is enabled.
896 * @method
897 * @memberof Popper.Utils
898 * @returns {Boolean}
899 */
900function isModifierEnabled(modifiers, modifierName) {
901  return modifiers.some(function (_ref) {
902    var name = _ref.name,
903        enabled = _ref.enabled;
904    return enabled && name === modifierName;
905  });
906}
907
908/**
909 * Get the prefixed supported property name
910 * @method
911 * @memberof Popper.Utils
912 * @argument {String} property (camelCase)
913 * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
914 */
915function getSupportedPropertyName(property) {
916  var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
917  var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
918
919  for (var i = 0; i < prefixes.length - 1; i++) {
920    var prefix = prefixes[i];
921    var toCheck = prefix ? '' + prefix + upperProp : property;
922    if (typeof document.body.style[toCheck] !== 'undefined') {
923      return toCheck;
924    }
925  }
926  return null;
927}
928
929/**
930 * Destroy the popper
931 * @method
932 * @memberof Popper
933 */
934function destroy() {
935  this.state.isDestroyed = true;
936
937  // touch DOM only if `applyStyle` modifier is enabled
938  if (isModifierEnabled(this.modifiers, 'applyStyle')) {
939    this.popper.removeAttribute('x-placement');
940    this.popper.style.left = '';
941    this.popper.style.position = '';
942    this.popper.style.top = '';
943    this.popper.style[getSupportedPropertyName('transform')] = '';
944  }
945
946  this.disableEventListeners();
947
948  // remove the popper if user explicity asked for the deletion on destroy
949  // do not use `remove` because IE11 doesn't support it
950  if (this.options.removeOnDestroy) {
951    this.popper.parentNode.removeChild(this.popper);
952  }
953  return this;
954}
955
956/**
957 * Get the window associated with the element
958 * @argument {Element} element
959 * @returns {Window}
960 */
961function getWindow(element) {
962  var ownerDocument = element.ownerDocument;
963  return ownerDocument ? ownerDocument.defaultView : window;
964}
965
966function attachToScrollParents(scrollParent, event, callback, scrollParents) {
967  var isBody = scrollParent.nodeName === 'BODY';
968  var target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
969  target.addEventListener(event, callback, { passive: true });
970
971  if (!isBody) {
972    attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
973  }
974  scrollParents.push(target);
975}
976
977/**
978 * Setup needed event listeners used to update the popper position
979 * @method
980 * @memberof Popper.Utils
981 * @private
982 */
983function setupEventListeners(reference, options, state, updateBound) {
984  // Resize event listener on window
985  state.updateBound = updateBound;
986  getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });
987
988  // Scroll event listener on scroll parents
989  var scrollElement = getScrollParent(reference);
990  attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
991  state.scrollElement = scrollElement;
992  state.eventsEnabled = true;
993
994  return state;
995}
996
997/**
998 * It will add resize/scroll events and start recalculating
999 * position of the popper element when they are triggered.
1000 * @method
1001 * @memberof Popper
1002 */
1003function enableEventListeners() {
1004  if (!this.state.eventsEnabled) {
1005    this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
1006  }
1007}
1008
1009/**
1010 * Remove event listeners used to update the popper position
1011 * @method
1012 * @memberof Popper.Utils
1013 * @private
1014 */
1015function removeEventListeners(reference, state) {
1016  // Remove resize event listener on window
1017  getWindow(reference).removeEventListener('resize', state.updateBound);
1018
1019  // Remove scroll event listener on scroll parents
1020  state.scrollParents.forEach(function (target) {
1021    target.removeEventListener('scroll', state.updateBound);
1022  });
1023
1024  // Reset state
1025  state.updateBound = null;
1026  state.scrollParents = [];
1027  state.scrollElement = null;
1028  state.eventsEnabled = false;
1029  return state;
1030}
1031
1032/**
1033 * It will remove resize/scroll events and won't recalculate popper position
1034 * when they are triggered. It also won't trigger onUpdate callback anymore,
1035 * unless you call `update` method manually.
1036 * @method
1037 * @memberof Popper
1038 */
1039function disableEventListeners() {
1040  if (this.state.eventsEnabled) {
1041    cancelAnimationFrame(this.scheduleUpdate);
1042    this.state = removeEventListeners(this.reference, this.state);
1043  }
1044}
1045
1046/**
1047 * Tells if a given input is a number
1048 * @method
1049 * @memberof Popper.Utils
1050 * @param {*} input to check
1051 * @return {Boolean}
1052 */
1053function isNumeric(n) {
1054  return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
1055}
1056
1057/**
1058 * Set the style to the given popper
1059 * @method
1060 * @memberof Popper.Utils
1061 * @argument {Element} element - Element to apply the style to
1062 * @argument {Object} styles
1063 * Object with a list of properties and values which will be applied to the element
1064 */
1065function setStyles(element, styles) {
1066  Object.keys(styles).forEach(function (prop) {
1067    var unit = '';
1068    // add unit if the value is numeric and is one of the following
1069    if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
1070      unit = 'px';
1071    }
1072    element.style[prop] = styles[prop] + unit;
1073  });
1074}
1075
1076/**
1077 * Set the attributes to the given popper
1078 * @method
1079 * @memberof Popper.Utils
1080 * @argument {Element} element - Element to apply the attributes to
1081 * @argument {Object} styles
1082 * Object with a list of properties and values which will be applied to the element
1083 */
1084function setAttributes(element, attributes) {
1085  Object.keys(attributes).forEach(function (prop) {
1086    var value = attributes[prop];
1087    if (value !== false) {
1088      element.setAttribute(prop, attributes[prop]);
1089    } else {
1090      element.removeAttribute(prop);
1091    }
1092  });
1093}
1094
1095/**
1096 * @function
1097 * @memberof Modifiers
1098 * @argument {Object} data - The data object generated by `update` method
1099 * @argument {Object} data.styles - List of style properties - values to apply to popper element
1100 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
1101 * @argument {Object} options - Modifiers configuration and options
1102 * @returns {Object} The same data object
1103 */
1104function applyStyle(data) {
1105  // any property present in `data.styles` will be applied to the popper,
1106  // in this way we can make the 3rd party modifiers add custom styles to it
1107  // Be aware, modifiers could override the properties defined in the previous
1108  // lines of this modifier!
1109  setStyles(data.instance.popper, data.styles);
1110
1111  // any property present in `data.attributes` will be applied to the popper,
1112  // they will be set as HTML attributes of the element
1113  setAttributes(data.instance.popper, data.attributes);
1114
1115  // if arrowElement is defined and arrowStyles has some properties

1116  if (data.arrowElement && Object.keys(data.arrowStyles).length) {
1117    setStyles(data.arrowElement, data.arrowStyles);
1118  }
1119
1120  return data;
1121}
1122
1123/**
1124 * Set the x-placement attribute before everything else because it could be used
1125 * to add margins to the popper margins needs to be calculated to get the
1126 * correct popper offsets.
1127 * @method
1128 * @memberof Popper.modifiers
1129 * @param {HTMLElement} reference - The reference element used to position the popper
1130 * @param {HTMLElement} popper - The HTML element used as popper.
1131 * @param {Object} options - Popper.js options
1132 */
1133function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
1134  // compute reference element offsets
1135  var referenceOffsets = getReferenceOffsets(state, popper, reference);
1136
1137  // compute auto placement, store placement inside the data object,
1138  // modifiers will be able to edit `placement` if needed
1139  // and refer to originalPlacement to know the original value
1140  var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
1141
1142  popper.setAttribute('x-placement', placement);
1143
1144  // Apply `position` to popper before anything else because
1145  // without the position applied we can't guarantee correct computations
1146  setStyles(popper, { position: 'absolute' });
1147
1148  return options;
1149}
1150
1151/**
1152 * @function
1153 * @memberof Modifiers
1154 * @argument {Object} data - The data object generated by `update` method
1155 * @argument {Object} options - Modifiers configuration and options
1156 * @returns {Object} The data object, properly modified
1157 */
1158function computeStyle(data, options) {
1159  var x = options.x,
1160      y = options.y;
1161  var popper = data.offsets.popper;
1162
1163  // Remove this legacy support in Popper.js v2
1164
1165  var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
1166    return modifier.name === 'applyStyle';
1167  }).gpuAcceleration;
1168  if (legacyGpuAccelerationOption !== undefined) {
1169    console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
1170  }
1171  var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
1172
1173  var offsetParent = getOffsetParent(data.instance.popper);
1174  var offsetParentRect = getBoundingClientRect(offsetParent);
1175
1176  // Styles
1177  var styles = {
1178    position: popper.position
1179  };
1180
1181  // floor sides to avoid blurry text
1182  var offsets = {
1183    left: Math.floor(popper.left),
1184    top: Math.floor(popper.top),
1185    bottom: Math.floor(popper.bottom),
1186    right: Math.floor(popper.right)
1187  };
1188
1189  var sideA = x === 'bottom' ? 'top' : 'bottom';
1190  var sideB = y === 'right' ? 'left' : 'right';
1191
1192  // if gpuAcceleration is set to `true` and transform is supported,
1193  //  we use `translate3d` to apply the position to the popper we
1194  // automatically use the supported prefixed version if needed
1195  var prefixedProperty = getSupportedPropertyName('transform');
1196
1197  // now, let's make a step back and look at this code closely (wtf?)
1198  // If the content of the popper grows once it's been positioned, it
1199  // may happen that the popper gets misplaced because of the new content
1200  // overflowing its reference element
1201  // To avoid this problem, we provide two options (x and y), which allow
1202  // the consumer to define the offset origin.
1203  // If we position a popper on top of a reference element, we can set
1204  // `x` to `top` to make the popper grow towards its top instead of
1205  // its bottom.
1206  var left = void 0,
1207      top = void 0;
1208  if (sideA === 'bottom') {
1209    top = -offsetParentRect.height + offsets.bottom;
1210  } else {
1211    top = offsets.top;
1212  }
1213  if (sideB === 'right') {
1214    left = -offsetParentRect.width + offsets.right;
1215  } else {
1216    left = offsets.left;
1217  }
1218  if (gpuAcceleration && prefixedProperty) {
1219    styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
1220    styles[sideA] = 0;
1221    styles[sideB] = 0;
1222    styles.willChange = 'transform';
1223  } else {
1224    // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
1225    var invertTop = sideA === 'bottom' ? -1 : 1;
1226    var invertLeft = sideB === 'right' ? -1 : 1;
1227    styles[sideA] = top * invertTop;
1228    styles[sideB] = left * invertLeft;
1229    styles.willChange = sideA + ', ' + sideB;
1230  }
1231
1232  // Attributes
1233  var attributes = {
1234    'x-placement': data.placement
1235  };
1236
1237  // Update `data` attributes, styles and arrowStyles
1238  data.attributes = _extends({}, attributes, data.attributes);
1239  data.styles = _extends({}, styles, data.styles);
1240  data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);
1241
1242  return data;
1243}
1244
1245/**
1246 * Helper used to know if the given modifier depends from another one.<br />
1247 * It checks if the needed modifier is listed and enabled.
1248 * @method
1249 * @memberof Popper.Utils
1250 * @param {Array} modifiers - list of modifiers
1251 * @param {String} requestingName - name of requesting modifier
1252 * @param {String} requestedName - name of requested modifier
1253 * @returns {Boolean}
1254 */
1255function isModifierRequired(modifiers, requestingName, requestedName) {
1256  var requesting = find(modifiers, function (_ref) {
1257    var name = _ref.name;
1258    return name === requestingName;
1259  });
1260
1261  var isRequired = !!requesting && modifiers.some(function (modifier) {

1262    return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
1263  });
1264
1265  if (!isRequired) {
1266    var _requesting = '`' + requestingName + '`';
1267    var requested = '`' + requestedName + '`';
1268    console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
1269  }
1270  return isRequired;
1271}
1272
1273/**
1274 * @function
1275 * @memberof Modifiers
1276 * @argument {Object} data - The data object generated by update method
1277 * @argument {Object} options - Modifiers configuration and options
1278 * @returns {Object} The data object, properly modified
1279 */
1280function arrow(data, options) {
1281  var _data$offsets$arrow;
1282
1283  // arrow depends on keepTogether in order to work
1284  if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
1285    return data;
1286  }
1287
1288  var arrowElement = options.element;
1289
1290  // if arrowElement is a string, suppose it's a CSS selector
1291  if (typeof arrowElement === 'string') {
1292    arrowElement = data.instance.popper.querySelector(arrowElement);
1293
1294    // if arrowElement is not found, don't run the modifier
1295    if (!arrowElement) {
1296      return data;
1297    }
1298  } else {
1299    // if the arrowElement isn't a query selector we must check that the
1300    // provided DOM node is child of its popper node
1301    if (!data.instance.popper.contains(arrowElement)) {
1302      console.warn('WARNING: `arrow.element` must be child of its popper element!');
1303      return data;
1304    }
1305  }
1306
1307  var placement = data.placement.split('-')[0];
1308  var _data$offsets = data.offsets,
1309      popper = _data$offsets.popper,
1310      reference = _data$offsets.reference;
1311
1312  var isVertical = ['left', 'right'].indexOf(placement) !== -1;
1313
1314  var len = isVertical ? 'height' : 'width';
1315  var sideCapitalized = isVertical ? 'Top' : 'Left';
1316  var side = sideCapitalized.toLowerCase();
1317  var altSide = isVertical ? 'left' : 'top';
1318  var opSide = isVertical ? 'bottom' : 'right';
1319  var arrowElementSize = getOuterSizes(arrowElement)[len];
1320
1321  //
1322  // extends keepTogether behavior making sure the popper and its
1323  // reference have enough pixels in conjuction
1324  //
1325
1326  // top/left side
1327  if (reference[opSide] - arrowElementSize < popper[side]) {
1328    data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
1329  }
1330  // bottom/right side
1331  if (reference[side] + arrowElementSize > popper[opSide]) {
1332    data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
1333  }
1334  data.offsets.popper = getClientRect(data.offsets.popper);
1335
1336  // compute center of the popper
1337  var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
1338
1339  // Compute the sideValue using the updated popper offsets
1340  // take popper margin in account because we don't have this info available
1341  var css = getStyleComputedProperty(data.instance.popper);
1342  var popperMarginSide = parseFloat(css['margin' + sideCapitalized], 10);
1343  var popperBorderSide = parseFloat(css['border' + sideCapitalized + 'Width'], 10);
1344  var sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;
1345
1346  // prevent arrowElement from being placed not contiguously to its popper
1347  sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
1348
1349  data.arrowElement = arrowElement;
1350  data.offsets.arrow = (_data$offsets$arrow = {}, defineProperty(_data$offsets$arrow, side, Math.round(sideValue)), defineProperty(_data$offsets$arrow, altSide, ''), _data$offsets$arrow);
1351
1352  return data;
1353}
1354
1355/**
1356 * Get the opposite placement variation of the given one
1357 * @method
1358 * @memberof Popper.Utils
1359 * @argument {String} placement variation
1360 * @returns {String} flipped placement variation
1361 */
1362function getOppositeVariation(variation) {
1363  if (variation === 'end') {
1364    return 'start';
1365  } else if (variation === 'start') {
1366    return 'end';
1367  }
1368  return variation;
1369}
1370
1371/**
1372 * List of accepted placements to use as values of the `placement` option.<br />
1373 * Valid placements are:
1374 * - `auto`
1375 * - `top`
1376 * - `right`
1377 * - `bottom`
1378 * - `left`
1379 *
1380 * Each placement can have a variation from this list:
1381 * - `-start`

1495;
1496
1497    if (overlapsRef || overflowsBoundaries || flippedVariation) {
1498      // this boolean to detect any flip loop
1499      data.flipped = true;
1500
1501      if (overlapsRef || overflowsBoundaries) {
1502        placement = flipOrder[index + 1];
1503      }
1504
1505      if (flippedVariation) {
1506        variation = getOppositeVariation(variation);
1507      }
1508
1509      data.placement = placement + (variation ? '-' + variation : '');
1510
1511      // this object contains `position`, we want to preserve it along with
1512      // any additional property we may add in the future
1513      data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
1514
1515      data = runModifiers(data.instance.modifiers, data, 'flip');
1516    }
1517  });
1518  return data;
1519}
1520
1521/**
1522 * @function
1523 * @memberof Modifiers
1524 * @argument {Object} data - The data object generated by update method
1525 * @argument {Object} options - Modifiers configuration and options
1526 * @returns {Object} The data object, properly modified
1527 */
1528function keepTogether(data) {
1529  var _data$offsets = data.offsets,
1530      popper = _data$offsets.popper,
1531      reference = _data$offsets.reference;
1532
1533  var placement = data.placement.split('-')[0];
1534  var floor = Math.floor;
1535  var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1536  var side = isVertical ? 'right' : 'bottom';
1537  var opSide = isVertical ? 'left' : 'top';
1538  var measurement = isVertical ? 'width' : 'height';
1539
1540  if (popper[side] < floor(reference[opSide])) {
1541    data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
1542  }
1543  if (popper[opSide] > floor(reference[side])) {
1544    data.offsets.popper[opSide] = floor(reference[side]);
1545  }
1546
1547  return data;
1548}
1549
1550/**
1551 * Converts a string containing value + unit into a px value number
1552 * @function
1553 * @memberof {modifiers~offset}
1554 * @private
1555 * @argument {String} str - Value + unit string
1556 * @argument {String} measurement - `height` or `width`
1557 * @argument {Object} popperOffsets
1558 * @argument {Object} referenceOffsets
1559 * @returns {Number|String}
1560 * Value in pixels, or original string if no values were extracted
1561 */
1562function toValue(str, measurement, popperOffsets, referenceOffsets) {
1563  // separate value from unit
1564  var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
1565  var value = +split[1];
1566  var unit = split[2];
1567
1568  // If it's not a number it's an operator, I guess
1569  if (!value) {
1570    return str;
1571  }
1572
1573  if (unit.indexOf('%') === 0) {
1574    var element = void 0;
1575    switch (unit) {
1576      case '%p':
1577        element = popperOffsets;
1578        break;
1579      case '%':
1580      case '%r':
1581      default:
1582        element = referenceOffsets;
1583    }
1584
1585    var rect = getClientRect(element);
1586    return rect[measurement] / 100 * value;
1587  } else if (unit === 'vh' || unit === 'vw') {
1588    // if is a vh or vw, we calculate the size based on the viewport
1589    var size = void 0;
1590    if (unit === 'vh') {
1591      size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
1592    } else {
1593      size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
1594    }
1595    return size / 100 * value;
1596  } else {
1597    // if is an explicit pixel unit, we get rid of the unit and keep the value
1598    // if is an implicit unit, it's px, and we return just the value
1599    return value;
1600  }
1601}
1602
1603/**
1604 * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
1605 * @function
1606 * @memberof {modifiers~offset}
1607 * @private
1608 * @argument {String} offset
1609 * @argument {Object} popperOffsets
1610 * @argument {Object} referenceOffsets
1611 * @argument {String} basePlacement
1612 * @returns {Array} a two cells array with x and y offsets in numbers
1613 */
1614function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
1615  var offsets = [0, 0];
1616
1617  // Use height if placement is left or right and index is 0 otherwise use width
1618  // in this way the first offset will use an axis and the second one
1619  // will use the other one
1620  var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
1621
1622  // Split the offset string to obtain a list of values and operands
1623  // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
1624  var fragments = offset.split(/(\+|\-)/).map(function (frag) {
1625    return frag.trim();
1626  });
1627
1628  // Detect if the offset string contains a pair of values or a single one
1629  // they could be separated by comma or space
1630  var divider = fragments.indexOf(find(fragments, function (frag) {
1631    return frag.search(/,|\s/) !== -1;
1632  }));
1633
1634  if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
1635    console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
1636  }
1637
1638  // If divider is found, we divide the list of values and operands to divide
1639  // them by ofset X and Y.
1640  var splitRegex = /\s*,\s*|\s+/;
1641  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];
1642
1643  // Convert the values with units to absolute pixels to allow our computations
1644  ops = ops.map(function (op, index) {
1645    // Most of the units rely on the orientation of the popper
1646    var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
1647    var mergeWithPrevious = false;
1648    return op
1649    // This aggregates any `+` or `-` sign that aren't considered operators
1650    // e.g.: 10 + +5 => [10, +, +5]
1651    .reduce(function (a, b) {
1652      if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
1653        a[a.length - 1] = b;
1654        mergeWithPrevious = true;
1655        return a;
1656      } else if (mergeWithPrevious) {
1657        a[a.length - 1] += b;
1658        mergeWithPrevious = false;
1659        return a;
1660      } else {
1661        return a.concat(b);
1662      }
1663    }, [])
1664    // Here we convert the string values into number values (in px)
1665    .map(function (str) {
1666      return toValue(str, measurement, popperOffsets, referenceOffsets);
1667    });
1668  });
1669
1670  // Loop trough the offsets arrays and execute the operations
1671  ops.forEach(function (op, index) {
1672    op.forEach(function (frag, index2) {
1673      if (isNumeric(frag)) {
1674        offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
1675      }
1676    });
1677  });
1678  return offsets;
1679}
1680
1681/**
1682 * @function
1683 * @memberof Modifiers
1684 * @argument {Object} data - The data object generated by update method
1685 * @argument {Object} options - Modifiers configuration and options
1686 * @argument {Number|String} options.offset=0
1687 * The offset value as described in the modifier description
1688 * @returns {Object} The data object, properly modified
1689 */
1690function offset(data, _ref) {
1691  var offset = _ref.offset;
1692  var placement = data.placement,
1693      _data$offsets = data.offsets,
1694      popper = _data$offsets.popper,
1695      reference = _data$offsets.reference;
1696
1697  var basePlacement = placement.split('-')[0];
1698
1699  var offsets = void 0;
1700  if (isNumeric(+offset)) {
1701    offsets = [+offset, 0];
1702  } else {
1703    offsets = parseOffset(offset, popper, reference, basePlacement);
1704  }
1705
1706  if (basePlacement === 'left') {
1707    popper.top += offsets[0];
1708    popper.left -= offsets[1];
1709  } else if (basePlacement === 'right') {
1710    popper.top += offsets[0];
1711    popper.left += offsets[1];
1712  } else if (basePlacement === 'top') {
1713    popper.left += offsets[0];
1714    popper.top -= offsets[1];
1715  } else if (basePlacement === 'bottom') {
1716    popper.left += offsets[0];
1717    popper.top += offsets[1];
1718  }
1719
1720  data.popper = popper;
1721  return data;
1722}
1723
1724/**
1725 * @function
1726 * @memberof Modifiers
1727 * @argument {Object} data - The data object generated by `update` method
1728 * @argument {Object} options - Modifiers configuration and options
1729 * @returns {Object} The data object, properly modified
1730 */
1731function preventOverflow(data, options) {
1732  var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
1733
1734  // If offsetParent is the reference element, we really want to
1735  // go one step up and use the next offsetParent as reference to
1736  // avoid to make this modifier completely useless and look like broken
1737  if (data.instance.reference === boundariesElement) {
1738    boundariesElement = getOffsetParent(boundariesElement);
1739  }
1740
1741  

1741
1742  options.boundaries = boundaries;
1743
1744  var order = options.priority;
1745  var popper = data.offsets.popper;
1746
1747  var check = {
1748    primary: function primary(placement) {
1749      var value = popper[placement];
1750      if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
1751        value = Math.max(popper[placement], boundaries[placement]);
1752      }
1753      return defineProperty({}, placement, value);
1754    },
1755    secondary: function secondary(placement) {
1756      var mainSide = placement === 'right' ? 'left' : 'top';
1757      var value = popper[mainSide];
1758      if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
1759        value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
1760      }
1761      return defineProperty({}, mainSide, value);
1762    }
1763  };
1764
1765  order.forEach(function (placement) {
1766    var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
1767    popper = _extends({}, popper, check[side](placement));
1768  });
1769
1770  data.offsets.popper = popper;
1771
1772  return data;
1773}
1774
1775/**
1776 * @function
1777 * @memberof Modifiers
1778 * @argument {Object} data - The data object generated by `update` method
1779 * @argument {Object} options - Modifiers configuration and options
1780 * @returns {Object} The data object, properly modified
1781 */
1782function shift(data) {
1783  var placement = data.placement;
1784  var basePlacement = placement.split('-')[0];
1785  var shiftvariation = placement.split('-')[1];
1786
1787  // if shift shiftvariation is specified, run the modifier
1788  if (shiftvariation) {
1789    var _data$offsets = data.offsets,
1790        reference = _data$offsets.reference,
1791        popper = _data$offsets.popper;
1792
1793    var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
1794    var side = isVertical ? 'left' : 'top';
1795    var measurement = isVertical ? 'width' : 'height';
1796
1797    var shiftOffsets = {
1798      start: defineProperty({}, side, reference[side]),
1799      end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
1800    };
1801
1802    data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
1803  }
1804
1805  return data;
1806}
1807
1808/**
1809 * @function
1810 * @memberof Modifiers
1811 * @argument {Object} data - The data object generated by update method
1812 * @argument {Object} options - Modifiers configuration and options
1813 * @returns {Object} The data object, properly modified
1814 */
1815function hide(data) {
1816  if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
1817    return data;
1818  }
1819
1820  var refRect = data.offsets.reference;
1821  var bound = find(data.instance.modifiers, function (modifier) {
1822    return modifier.name === 'preventOverflow';
1823  }).boundaries;
1824
1825  if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
1826    // Avoid unnecessary DOM access if visibility hasn't changed
1827    if (data.hide === true) {
1828      return data;
1829    }
1830
1831    data.hide = true;
1832    data.attributes['x-out-of-boundaries'] = '';
1833  } else {
1834    // Avoid unnecessary DOM access if visibility hasn't changed
1835    if (data.hide === false) {
1836      return data;
1837    }
1838
1839    data.hide = false;
1840    data.attributes['x-out-of-boundaries'] = false;
1841  }
1842
1843  return data;
1844}
1845
1846/**
1847 * @function
1848 * @memberof Modifiers
1849 * @argument {Object} data - The data object generated by `update` method
1850 * @argument {Object} options - Modifiers configuration and options
1851 * @returns {Object} The data object, properly modified
1852 */
1853function inner(data) {
1854  var placement = data.placement;
1855  var basePlacement = placement.split('-')[0];
1856  var _data$offsets = data.offsets,
1857      popper = _data$offsets.popper,
1858      reference = _data$offsets.reference;
1859
1860  var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
1861
1862  var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
1863
1864  popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
1865
1866  data.placement = getOppositePlacement(placement);
1867  data.offsets.popper = getClientRect(popper);
1868
1869  return data;
1870}
1871
1872/**
1873 * Modifier function, each modifier can have a function of this type assigned
1874 * to its `fn` property.<br />
1875 * These functions will be called on each update, this means that you must
1876 * make sure they are performant enough to avoid performance bottlenecks.
1877 *
1878 * @function ModifierFn
1879 * @argument {dataObject} data - The data object generated by `update` method
1880 * @argument {Object} options - Modifiers configuration and options
1881 * @returns {dataObject} The data object, properly modified
1882 */
1883
1884/**
1885 * Modifiers are plugins used to alter the behavior of your poppers.<br />
1886 * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
1887 * needed by the library.
1888 *
1889 * Usually you don't want to override the `order`, `fn` and `onLoad` props.
1890 * All the other properties are configurations that could be tweaked.
1891 * @namespace modifiers
1892 */
1893var modifiers = {
1894  /**
1895   * Modifier used to shift the popper on the start or end of its reference
1896   * element.<br />
1897   * It will read the variation of the `placement` property.<br />
1898   * It can be one either `-end` or `-start`.
1899   * @memberof modifiers
1900   * @inner
1901   */
1902  shift: {
1903    /** @prop {number} order=100 - Index used to define the order of execution */
1904    order: 100,
1905    /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
1906    enabled: true,
1907    /** @prop {ModifierFn} */
1908    fn: shift
1909  },
1910
1911  /**
1912   * The `offset` modifier can shift your popper on both its axis.
1913   *
1914   * It accepts the following units:
1915   * - `px` or unit

2183    fn: applyStyle,
2184    /** @prop {Function} */
2185    onLoad: applyStyleOnLoad,
2186    /**
2187     * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
2188     * @prop {Boolean} gpuAcceleration=true
2189     * If true, it uses the CSS 3d transformation to position the popper.
2190     * Otherwise, it will use the `top` and `left` properties.
2191     */
2192    gpuAcceleration: undefined
2193  }
2194};
2195
2196/**
2197 * The `dataObject` is an object containing all the informations used by Popper.js
2198 * this object get passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
2199 * @name dataObject
2200 * @property {Object} data.instance The Popper.js instance
2201 * @property {String} data.placement Placement applied to popper
2202 * @property {String} data.originalPlacement Placement originally defined on init
2203 * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
2204 * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper.
2205 * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
2206 * @property {Object} data.styles Any CSS property defined here will be applied to the popper, it expects the JavaScript nomenclature (eg. `marginBottom`)
2207 * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow, it expects the JavaScript nomenclature (eg. `marginBottom`)
2208 * @property {Object} data.boundaries Offsets of the popper boundaries
2209 * @property {Object} data.offsets The measurements of popper, reference and arrow elements.
2210 * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
2211 * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
2212 * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
2213 */
2214
2215/**
2216 * Default options provided to Popper.js constructor.<br />
2217 * These can be overriden using the `options` argument of Popper.js.<br />
2218 * To override an option, simply pass as 3rd argument an object with the same
2219 * structure of this object, example:
2220 * ```
2221 * new Popper(ref, pop, {
2222 *   modifiers: {
2223 *     preventOverflow: { enabled: false }
2224 *   }
2225 * })
2226 * ```
2227 * @type {Object}
2228 * @static
2229 * @memberof Popper
2230 */
2231var Defaults = {
2232  /**
2233   * Popper's placement
2234   * @prop {Popper.placements} placement='bottom'
2235   */
2236  placement: 'bottom',
2237
2238  /**
2239   * Whether events (resize, scroll) are initially enabled
2240   * @prop {Boolean} eventsEnabled=true
2241   */
2242  eventsEnabled: true,
2243
2244  /**
2245   * Set to true if you want to automatically remove the popper when
2246   * you call the `destroy` method.
2247   * @prop {Boolean} removeOnDestroy=false
2248   */
2249  removeOnDestroy: false,
2250
2251  /**
2252   * Callback called when the popper is created.<br />
2253   * By default, is set to no-op.<br />
2254   * Access Popper.js instance with `data.instance`.
2255   * @prop {onCreate}
2256   */
2257  onCreate: function onCreate() {},
2258
2259  /**
2260   * Callback called when the popper is updated, this callback is not called
2261   * on the initialization/creation of the popper, but only on subsequent
2262   * updates.<br />
2263   * By default, is set to no-op.<br />
2264   * Access Popper.js instance with `data.instance`.
2265   * @prop {onUpdate}
2266   */
2267  onUpdate: function onUpdate() {},
2268
2269  /**
2270   * List of modifiers used to modify the offsets before they are applied to the popper.
2271   * They provide most of the functionalities of Popper.js
2272   * @prop {modifiers}
2273   */
2274  modifiers: modifiers
2275};
2276
2277/**
2278 * @callback onCreate
2279 * @param {dataObject} data
2280 */
2281
2282/**
2283 * @callback onUpdate
2284 * @param {dataObject} data
2285 */
2286
2287// Utils
2288// Methods
2289var Popper = function () {
2290  /**
2291   * Create a new Popper.js instance
2292   * @class Popper
2293   * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper
2294   * @param {HTMLElement} popper - The HTML element used as popper.
2295   * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
2296   * @return {Object} instance - The generated Popper.js instance
2297   */
2298  function Popper(reference, popper) {
2299    var _this = this;
2300
2301    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
2302    classCallCheck(this, Popper);
2303
2304    this.scheduleUpdate = function () {
2305      return requestAnimationFrame(_this.update);
2306    };
2307
2308    // make update() debounced, so that it only runs at most once-per-tick
2309    this.update = debounce(this.update.bind(this));
2310
2311    // with {} we create a new object with the options inside it
2312    this.options = _extends({}, Popper.Defaults, options);
2313
2314    // init state
2315    this.state = {

2316      isDestroyed: false,
2317      isCreated: false,
2318      scrollParents: []
2319    };
2320
2321    // get reference and popper elements (allow jQuery wrappers)
2322    this.reference = reference && reference.jquery ? reference[0] : reference;
2323    this.popper = popper && popper.jquery ? popper[0] : popper;
2324
2325    // Deep merge modifiers options
2326    this.options.modifiers = {};
2327    Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {
2328      _this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
2329    });
2330
2331    // Refactoring modifiers' list (Object => Array)
2332    this.modifiers = Object.keys(this.options.modifiers).map(function (name) {
2333      return _extends({
2334        name: name
2335      }, _this.options.modifiers[name]);
2336    })
2337    // sort the modifiers by order
2338    .sort(function (a, b) {
2339      return a.order - b.order;
2340    });
2341
2342    // modifiers have the ability to execute arbitrary code when Popper.js get inited
2343    // such code is executed in the same order of its modifier
2344    // they could add new properties to their options configuration
2345    // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
2346    this.modifiers.forEach(function (modifierOptions) {
2347      if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
2348        modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);
2349      }
2350    });
2351
2352    // fire the first update to position the popper in the right place
2353    this.update();
2354
2355    var eventsEnabled = this.options.eventsEnabled;
2356    if (eventsEnabled) {
2357      // setup event listeners, they will take care of update the position in specific situations
2358      this.enableEventListeners();
2359    }
2360
2361    this.state.eventsEnabled = eventsEnabled;
2362  }
2363
2364  // We can't use class properties because they don't get listed in the
2365  // class prototype and break stuff like Sinon stubs
2366
2367
2368  createClass(Popper, [{
2369    key: 'update',
2370    value: function update$$1() {
2371      return update.call(this);
2372    }
2373  }, {
2374    key: 'destroy',
2375    value: function destroy$$1() {
2376      return destroy.call(this);
2377    }
2378  }, {
2379    key: 'enableEventListeners',
2380    value: function enableEventListeners$$1() {
2381      return enableEventListeners.call(this);
2382    }
2383  }, {
2384    key: 'disableEventListeners',
2385    value: function disableEventListeners$$1() {
2386      return disableEventListeners.call(this);
2387    }
2388
2389    /**
2390     * Schedule an update, it will run on the next UI update available
2391     * @method scheduleUpdate
2392     * @memberof Popper
2393     */
2394
2395
2396    /**
2397     * Collection of utilities useful when writing custom modifiers.
2398     * Starting from version 1.7, this method is available only if you
2399     * include `popper-utils.js` before `popper.js`.
2400     *
2401     * **DEPRECATION**: This way to access PopperUtils is deprecated
2402     * and will be removed in v2! Use the PopperUtils module directly instead.
2403     * Due to the high instability of the methods contained in Utils, we can't
2404     * guarantee them to follow semver. Use them at your own risk!
2405     * @static
2406     * @private
2407     * @type {Object}
2408     * @deprecated since version 1.8
2409     * @member Utils
2410     * @memberof Popper
2411     */
2412
2413  }]);
2414  return Popper;
2415}();
2416
2417/**
2418 * The `referenceObject` is an object that provides an interface compatible with Popper.js
2419 * and lets you use it as replacement of a real DOM node.<br />
2420 * You can use this method to position a popper relatively to a set of coordinates
2421 * in case you don't have a DOM node to use as reference.
2422 *
2423 * ```
2424 * new Popper(referenceObject, popperNode);
2425 * ```
2426 *
2427 * NB: This feature isn't supported in Internet Explorer 10
2428 * @name referenceObject
2429 * @property {Function} data.getBoundingClientRect
2430 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
2431 * @property {number} data.clientWidth
2432 * An ES6 getter that will return the width of the virtual reference element.
2433 * @property {number} data.clientHeight
2434 * An ES6 getter that will return the height of the virtual reference element.
2435 */
2436
2437
2438Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
2439Popper.placements = placements;
2440Popper.Defaults = Defaults;
2441
2442return Popper;
2443
2444})));