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@popperjs/core/dist/umd/popper-base.js

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1/**
+
2 * @popperjs/core v2.11.5 - MIT License
+
3 */
+
4
+
5(function (global, factory) {
+
6  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+
7  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+
8  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.Popper = {}));
+
9}(this, (function (exports) { 'use strict';
+
10
+
11  function getWindow(node) {
+
12    if (node == null) {
+
13      return window;
+
14    }
+
15
+
16    if (node.toString() !== '[object Window]') {
+
17      var ownerDocument = node.ownerDocument;
+
18      return ownerDocument ? ownerDocument.defaultView || window : window;
+
19    }
+
20
+
21    return node;
+
22  }
+
23
+
24  function isElement(node) {
+
25    var OwnElement = getWindow(node).Element;
+
26    return node instanceof OwnElement || node instanceof Element;
+
27  }
+
28
+
29  function isHTMLElement(node) {
+
30    var OwnElement = getWindow(node).HTMLElement;
+
31    return node instanceof OwnElement || node instanceof HTMLElement;
+
32  }
+
33
+
34  function isShadowRoot(node) {
+
35    // IE 11 has no ShadowRoot
+
36    if (typeof ShadowRoot === 'undefined') {
+
37      return false;
+
38    }
+
39
+
40    var OwnElement = getWindow(node).ShadowRoot;
+
41    return node instanceof OwnElement || node instanceof ShadowRoot;
+
42  }
+
43
+
44  var max = Math.max;
+
45  var min = Math.min;
+
46  var round = Math.round;
+
47
+
48  function getBoundingClientRect(element, includeScale) {
+
49    if (includeScale === void 0) {
+
50      includeScale = false;
+
51    }
+
52
+
53    var rect = element.getBoundingClientRect();
+
54    var scaleX = 1;
+
55    var scaleY = 1;
+
56
+
57    if (isHTMLElement(element) && includeScale) {
+
58      var offsetHeight = element.offsetHeight;
+
59      var offsetWidth = element.offsetWidth; // Do not attempt to divide by 0, otherwise we get `Infinity` as scale
+
60      // Fallback to 1 in case both values are `0`
+
61
+
62      if (offsetWidth > 0) {
+
63        scaleX = round(rect.width) / offsetWidth || 1;
+
64      }
+
65
+
66      if (offsetHeight > 0) {
+
67        scaleY = round(rect.height) / offsetHeight || 1;
+
68      }
+
69    }
+
70
+
71    return {
+
72      width: rect.width / scaleX,
+
73      height: rect.height / scaleY,
+
74      top: rect.top / scaleY,
+
75      right: rect.right / scaleX,
+
76      bottom: rect.bottom / scaleY,
+
77      left: rect.left / scaleX,
+
78      x: rect.left / scaleX,
+
79      y: rect.top / scaleY
+
80    };
+
81  }
+
82
+
83  function getWindowScroll(node) {
+
84    var win = getWindow(node);
+
85    var scrollLeft = win.pageXOffset;
+
86    var scrollTop = win.pageYOffset;
+
87    return {
+
88      scrollLeft: scrollLeft,
+
89      scrollTop: scrollTop
+
90    };
+
91  }
+
92
+
93  function getHTMLElementScroll(element) {
+
94    return {
+
95      scrollLeft: element.scrollLeft,
+
96      scrollTop: element.scrollTop
+
97    };
+
98  }
+
99
+
100  function getNodeScroll(node) {
+
101    if (node === getWindow(node) || !isHTMLElement(node)) {
+
102      return getWindowScroll(node);
+
103    } else {
+
104      return getHTMLElementScroll(node);
+
105    }
+
106  }
+
107
+
108  function getNodeName(element) {
+
109    return element ? (element.nodeName || '').toLowerCase() : null;
+
110  }
+
111
+
112  function getDocumentElement(element) {
+
113    // $FlowFixMe[incompatible-return]: assume body is always available
+
114    return ((isElement(element) ? element.ownerDocument : // $FlowFixMe[prop-missing]
+
115    element.document) || window.document).documentElement;
+
116  }
+
117
+
118  function getWindowScrollBarX(element) {
+
119    // If <html> has a CSS width greater than the viewport, then this will be
+
120    // incorrect for RTL.
+
121    // Popper 1 is broken in this case and never had a bug report so let's assume
+
122    // it's not an issue. I don't think anyone ever specifies width on <html>
+
123    // anyway.
+
124    // Browsers where the left scrollbar doesn't cause an issue report `0` for
+
125    // this (e.g. Edge 2019, IE11, Safari)
+
126    return getBoundingClientRect(getDocumentElement(element)).left + getWindowScroll(element).scrollLeft;
+
127  }
+
128
+
129  function getComputedStyle(element) {
+
130    return getWindow(element).getComputedStyle(element);
+
131  }
+
132
+
133  function isScrollParent(element) {
+
134    // Firefox wants us to check `-x` and `-y` variations as well
+
135    var _getComputedStyle = getComputedStyle(element),
+
136        overflow = _getComputedStyle.overflow,
+
137        overflowX = _getComputedStyle.overflowX,
+
138        overflowY = _getComputedStyle.overflowY;
+
139
+
140    return /auto|scroll|overlay|hidden/.test(overflow + overflowY + overflowX);
+
141  }
+
142
+
143  function isElementScaled(element) {
+
144    var rect = element.getBoundingClientRect();
+
145    var scaleX = round(rect.width) / element.offsetWidth || 1;
+
146    var scaleY = round(rect.height) / element.offsetHeight || 1;
+
147    return scaleX !== 1 || scaleY !== 1;
+
148  } // Returns the composite rect of an element relative to its offsetParent.
+
149  // Composite means it takes into account transforms as well as layout.
+
150
+
151
+
152  function getCompositeRect(elementOrVirtualElement, offsetParent, isFixed) {
+
153    if (isFixed === void 0) {
+
154      isFixed = false;
+
155    }
+
156
+
157    var isOffsetParentAnElement = isHTMLElement(offsetParent);
+
158    var offsetParentIsScaled = isHTMLElement(offsetParent) && isElementScaled(offsetParent);
+
159    var documentElement = getDocumentElement(offsetParent);
+
160    var rect = getBoundingClientRect(elementOrVirtualElement, offsetParentIsScaled);
+
161    var scroll = {
+
162      scrollLeft: 0,
+
163      scrollTop: 0
+
164    };
+
165    var offsets = {
+
166      x: 0,
+
167      y: 0
+
168    };
+
169
+
170    if (isOffsetParentAnElement || !isOffsetParentAnElement && !isFixed) {
+
171      if (getNodeName(offsetParent) !== 'body' || // https://github.com/popperjs/popper-core/issues/1078
+
172      isScrollParent(documentElement)) {
+
173        scroll = getNodeScroll(offsetParent);
+
174      }
+
175
+
176      if (isHTMLElement(offsetParent)) {
+
177        offsets = getBoundingClientRect(offsetParent, true);
+
178        offsets.x += offsetParent.clientLeft;
+
179        offsets.y += offsetParent.clientTop;
+
180      } else if (documentElement) {
+
181        offsets.x = getWindowScrollBarX(documentElement);
+
182      }
+
183    }
+
184
+
185    return {
+
186      x: rect.left + scroll.scrollLeft - offsets.x,
+
187      y: rect.top + scroll.scrollTop - offsets.y,
+
188      width: rect.width,
+
189      height: rect.height
+
190    };
+
191  }
+
192
+
193  // means it doesn't take into account transforms.
+
194
+
195  function getLayoutRect(element) {
+
196    var clientRect = getBoundingClientRect(element); // Use the clientRect sizes if it's not been transformed.
+
197    // Fixes https://github.com/popperjs/popper-core/issues/1223
+
198
+
199    var width = element.offsetWidth;
+
200    var height = element.offsetHeight;
+
201
+
202    if (Math.abs(clientRect.width - width) <= 1) {
+
203      width = clientRect.width;
+
204    }
+
205
+
206    if (Math.abs(clientRect.height - height) <= 1) {
+
207      height = clientRect.height;
+
208    }
+
209
+
210    return {
+
211      x: element.offsetLeft,
+
212      y: element.offsetTop,
+
213      width: width,
+
214      height: height
+
215    };
+
216  }
+
217
+
218  function getParentNode(element) {
+
219    if (getNodeName(element) === 'html') {
+
220      return element;
+
221    }
+
222
+
223    return (// this is a quicker (but less type safe) way to save quite some bytes from the bundle
+
224      // $FlowFixMe[incompatible-return]
+
225      // $FlowFixMe[prop-missing]
+
226      element.assignedSlot || // step into the shadow DOM of the parent of a slotted node
+
227      element.parentNode || ( // DOM Element detected
+
228      isShadowRoot(element) ? element.host : null) || // ShadowRoot detected
+
229      // $FlowFixMe[incompatible-call]: HTMLElement is a Node
+
230      getDocumentElement(element) // fallback
+
231
+
232    );
+
233  }
+
234
+
235  function getScrollParent(node) {
+
236    if (['html', 'body', '#document'].indexOf(getNodeName(node)) >= 0) {
+
237      // $FlowFixMe[incompatible-return]: assume body is always available
+
238      return node.ownerDocument.body;
+
239    }
+
240
+
241    if (isHTMLElement(node) && isScrollParent(node)) {
+
242      return node;
+
243    }
+
244
+
245    return getScrollParent(getParentNode(node));
+
246  }
+
247
+
248  /*
+
249  given a DOM element, return the list of all scroll parents, up the list of ancesors
+
250  until we get to the top window object. This list is what we attach scroll listeners
+
251  to, because if any of these parent elements scroll, we'll need to re-calculate the
+
252  reference element's position.
+
253  */
+
254
+
255  function listScrollParents(element, list) {
+
256    var _element$ownerDocumen;
+
257
+
258    if (list === void 0) {
+
259      list = [];
+
260    }
+
261
+
262    var scrollParent = getScrollParent(element);
+
263    var isBody = scrollParent === ((_element$ownerDocumen = element.ownerDocument) == null ? void 0 : _element$ownerDocumen.body);
+
264    var win = getWindow(scrollParent);
+
265    var target = isBody ? [win].concat(win.visualViewport || [], isScrollParent(scrollParent) ? scrollParent : []) : scrollParent;
+
266    var updatedList = list.concat(target);
+
267    return isBody ? updatedList : // $FlowFixMe[incompatible-call]: isBody tells us target will be an HTMLElement here
+
268    updatedList.concat(listScrollParents(getParentNode(target)));
+
269  }
+
270
+
271  function isTableElement(element) {
+
272    return ['table', 'td', 'th'].indexOf(getNodeName(element)) >= 0;
+
273  }
+
274
+
275  function getTrueOffsetParent(element) {
+
276    if (!isHTMLElement(element) || // https://github.com/popperjs/popper-core/issues/837
+
277    getComputedStyle(element).position === 'fixed') {
+
278      return null;
+
279    }
+
280
+
281    return element.offsetParent;
+
282  } // `.offsetParent` reports `null` for fixed elements, while absolute elements
+
283  // return the containing block
+
284
+
285
+
286  function getContainingBlock(element) {
+
287    var isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') !== -1;
+
288    var isIE = navigator.userAgent.indexOf('Trident') !== -1;
+
289
+
290    if (isIE && isHTMLElement(element)) {
+
291      // In IE 9, 10 and 11 fixed elements containing block is always established by the viewport
+
292      var elementCss = getComputedStyle(element);
+
293
+
294      if (elementCss.position === 'fixed') {
+
295        return null;
+
296      }
+
297    }
+
298
+
299    var currentNode = getParentNode(element);
+
300
+
301    if (isShadowRoot(currentNode)) {
+
302      currentNode = currentNode.host;
+
303    }
+
304
+
305    while (isHTMLElement(currentNode) && ['html', 'body'].indexOf(getNodeName(currentNode)) < 0) {
+
306      var css = getComputedStyle(currentNode); // This is non-exhaustive but covers the most common CSS properties that
+
307      // create a containing block.
+
308      // https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block#identifying_the_containing_block
+
309
+
310      if (css.transform !== 'none' || css.perspective !== 'none' || css.contain === 'paint' || ['transform', 'perspective'].indexOf(css.willChange) !== -1 || isFirefox && css.willChange === 'filter' || isFirefox && css.filter && css.filter !== 'none') {
+
311        return currentNode;
+
312      } else {
+
313        currentNode = currentNode.parentNode;
+
314      }
+
315    }
+
316
+
317    return null;
+
318  } // Gets the closest ancestor positioned element. Handles some edge cases,
+
319  // such as table ancestors and cross browser bugs.
+
320
+
321
+
322  function getOffsetParent(element) {
+
323    var window = getWindow(element);
+
324    var offsetParent = getTrueOffsetParent(element);
+
325
+
326    while (offsetParent && isTableElement(offsetParent) && getComputedStyle(offsetParent).position === 'static') {
+
327      offsetParent = getTrueOffsetParent(offsetParent);
+
328    }
+
329
+
330    if (offsetParent && (getNodeName(offsetParent) === 'html' || getNodeName(offsetParent) === 'body' && getComputedStyle(offsetParent).position === 'static')) {
+
331      return window;
+
332    }
+
333
+
334    return offsetParent || getContainingBlock(element) || window;
+
335  }
+
336
+
337  var top = 'top';
+
338  var bottom = 'bottom';
+
339  var right = 'right';
+
340  var left = 'left';
+
341  var auto = 'auto';
+
342  var basePlacements = [top, bottom, right, left];
+
343  var start = 'start';
+
344  var end = 'end';
+
345  var clippingParents = 'clippingParents';
+
346  var viewport = 'viewport';
+
347  var popper = 'popper';
+
348  var reference = 'reference';
+
349
+
350  var beforeRead = 'beforeRead';
+
351  var read = 'read';
+
352  var afterRead = 'afterRead'; // pure-logic modifiers
+
353
+
354  var beforeMain = 'beforeMain';
+
355  var main = 'main';
+
356  var afterMain = 'afterMain'; // modifier with the purpose to write to the DOM (or write into a framework state)
+
357
+
358  var beforeWrite = 'beforeWrite';
+
359  var write = 'write';
+
360  var afterWrite = 'afterWrite';
+
361  var modifierPhases = [beforeRead, read, afterRead, beforeMain, main, afterMain, beforeWrite, write, afterWrite];
+
362
+
363  function order(modifiers) {
+
364    var map = new Map();
+
365    var visited = new Set();
+
366    var result = [];
+
367    modifiers.forEach(function (modifier) {
+
368      map.set(modifier.name, modifier);
+
369    }); // On visiting object, check for its dependencies and visit them recursively
+
370
+
371    function sort(modifier) {
+
372      visited.add(modifier.name);
+
373      var requires = [].concat(modifier.requires || [], modifier.requiresIfExists || []);
+
374      requires.forEach(function (dep) {
+
375        if (!visited.has(dep)) {
+
376          var depModifier = map.get(dep);
+
377
+
378          if (depModifier) {
+
379            sort(depModifier);
+
380          }
+
381        }
+
382      });
+
383      result.push(modifier);
+
384    }
+
385
+
386    modifiers.forEach(function (modifier) {
+
387      if (!visited.has(modifier.name)) {
+
388        // check for visited object
+
389        sort(modifier);
+
390      }
+
391    });
+
392    return result;
+
393  }
+
394
+
395  function orderModifiers(modifiers) {
+
396    // order based on dependencies
+
397    var orderedModifiers = order(modifiers); // order based on phase
+
398
+
399    return modifierPhases.reduce(function (acc, phase) {
+
400      return acc.concat(orderedModifiers.filter(function (modifier) {
+
401        return modifier.phase === phase;
+
402      }));
+
403    }, []);
+
404  }
+
405
+
406  function debounce(fn) {
+
407    var pending;
+
408    return function () {
+
409      if (!pending) {
+
410        pending = new Promise(function (resolve) {
+
411          Promise.resolve().then(function () {
+
412            pending = undefined;
+
413            resolve(fn());
+
414          });
+
415        });
+
416      }
+
417
+
418      return pending;
+
419    };
+
420  }
+
421
+
422  function format(str) {
+
423    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+
424      args[_key - 1] = arguments[_key];
+
425    }
+
426
+
427    return [].concat(args).reduce(function (p, c) {
+
428      return p.replace(/%s/, c);
+
429    }, str);
+
430  }
+
431
+
432  var INVALID_MODIFIER_ERROR = 'Popper: modifier "%s" provided an invalid %s property, expected %s but got %s';
+
433  var MISSING_DEPENDENCY_ERROR = 'Popper: modifier "%s" requires "%s", but "%s" modifier is not available';
+
434  var VALID_PROPERTIES = ['name', 'enabled', 'phase', 'fn', 'effect', 'requires', 'options'];
+
435  function validateModifiers(modifiers) {
+
436    modifiers.forEach(function (modifier) {
+
437      [].concat(Object.keys(modifier), VALID_PROPERTIES) // IE11-compatible replacement for `new Set(iterable)`
+
438      .filter(function (value, index, self) {
+
439        return self.indexOf(value) === index;
+
440      }).forEach(function (key) {
+
441        switch (key) {
+
442          case 'name':
+
443            if (typeof modifier.name !== 'string') {
+
444              console.error(format(INVALID_MODIFIER_ERROR, String(modifier.name), '"name"', '"string"', "\"" + String(modifier.name) + "\""));
+
445            }
+
446
+
447            break;
+
448
+
449          case 'enabled':
+
450            if (typeof modifier.enabled !== 'boolean') {
+
451              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"enabled"', '"boolean"', "\"" + String(modifier.enabled) + "\""));
+
452            }
+
453
+
454            break;
+
455
+
456          case 'phase':
+
457            if (modifierPhases.indexOf(modifier.phase) < 0) {
+
458              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"phase"', "either " + modifierPhases.join(', '), "\"" + String(modifier.phase) + "\""));
+
459            }
+
460
+
461            break;
+
462
+
463          case 'fn':
+
464            if (typeof modifier.fn !== 'function') {
+
465              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"fn"', '"function"', "\"" + String(modifier.fn) + "\""));
+
466            }
+
467
+
468            break;
+
469
+
470          case 'effect':
+
471            if (modifier.effect != null && typeof modifier.effect !== 'function') {
+
472              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"effect"', '"function"', "\"" + String(modifier.fn) + "\""));
+
473            }
+
474
+
475            break;
+
476
+
477          case 'requires':
+
478            if (modifier.requires != null && !Array.isArray(modifier.requires)) {
+
479              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requires"', '"array"', "\"" + String(modifier.requires) + "\""));
+
480            }
+
481
+
482            break;
+
483
+
484          case 'requiresIfExists':
+
485            if (!Array.isArray(modifier.requiresIfExists)) {
+
486              console.error(format(INVALID_MODIFIER_ERROR, modifier.name, '"requiresIfExists"', '"array"', "\"" + String(modifier.requiresIfExists) + "\""));
+
487            }
+
488
+
489            break;
+
490
+
491          case 'options':
+
492          case 'data':
+
493            break;
+
494
+
495          default:
+
496            console.error("PopperJS: an invalid property has been provided to the \"" + modifier.name + "\" modifier, valid properties are " + VALID_PROPERTIES.map(function (s) {
+
497              return "\"" + s + "\"";
+
498            }).join(', ') + "; but \"" + key + "\" was provided.");
+
499        }
+
500
+
501        modifier.requires && modifier.requires.forEach(function (requirement) {
+
502          if (modifiers.find(function (mod) {
+
503            return mod.name === requirement;
+
504          }) == null) {
+
505            console.error(format(MISSING_DEPENDENCY_ERROR, String(modifier.name), requirement, requirement));
+
506          }
+
507        });
+
508      });
+
509    });
+
510  }
+
511
+
512  function uniqueBy(arr, fn) {
+
513    var identifiers = new Set();
+
514    return arr.filter(function (item) {
+
515      var identifier = fn(item);
+
516
+
517      if (!identifiers.has(identifier)) {
+
518        identifiers.add(identifier);
+
519        return true;
+
520      }
+
521    });
+
522  }
+
523
+
524  function getBasePlacement(placement) {
+
525    return placement.split('-')[0];
+
526  }
+
527
+
528  function mergeByName(modifiers) {
+
529    var merged = modifiers.reduce(function (merged, current) {
+
530      var existing = merged[current.name];
+
531      merged[current.name] = existing ? Object.assign({}, existing, current, {
+
532        options: Object.assign({}, existing.options, current.options),
+
533        data: Object.assign({}, existing.data, current.data)
+
534      }) : current;
+
535      return merged;
+
536    }, {}); // IE11 does not support Object.values
+
537
+
538    return Object.keys(merged).map(function (key) {
+
539      return merged[key];
+
540    });
+
541  }
+
542
+
543  function getViewportRect(element) {
+
544    var win = getWindow(element);
+
545    var html = getDocumentElement(element);
+
546    var visualViewport = win.visualViewport;
+
547    var width = html.clientWidth;
+
548    var height = html.clientHeight;
+
549    var x = 0;
+
550    var y = 0; // NB: This isn't supported on iOS <= 12. If the keyboard is open, the popper
+
551    // can be obscured underneath it.
+
552    // Also, `html.clientHeight` adds the bottom bar height in Safari iOS, even
+
553    // if it isn't open, so if this isn't available, the popper will be detected
+
554    // to overflow the bottom of the screen too early.
+
555
+
556    if (visualViewport) {
+
557      width = visualViewport.width;
+
558      height = visualViewport.height; // Uses Layout Viewport (like Chrome; Safari does not currently)
+
559      // In Chrome, it returns a value very close to 0 (+/-) but contains rounding
+
560      // errors due to floating point numbers, so we need to check precision.
+
561      // Safari returns a number <= 0, usually < -1 when pinch-zoomed
+
562      // Feature detection fails in mobile emulation mode in Chrome.
+
563      // Math.abs(win.innerWidth / visualViewport.scale - visualViewport.width) <
+
564      // 0.001
+
565      // Fallback here: "Not Safari" userAgent
+
566
+
567      if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {
+
568        x = visualViewport.offsetLeft;
+
569        y = visualViewport.offsetTop;
+
570      }
+
571    }
+
572
+
573    return {
+
574      width: width,
+
575      height: height,
+
576      x: x + getWindowScrollBarX(element),
+
577      y: y
+
578    };
+
579  }
+
580
+
581  // of the `<html>` and `<body>` rect bounds if horizontally scrollable
+
582
+
583  function getDocumentRect(element) {
+
584    var _element$ownerDocumen;
+
585
+
586    var html = getDocumentElement(element);
+
587    var winScroll = getWindowScroll(element);
+
588    var body = (_element$ownerDocumen = element.ownerDocument) == null ? void 0 : _element$ownerDocumen.body;
+
589    var width = max(html.scrollWidth, html.clientWidth, body ? body.scrollWidth : 0, body ? body.clientWidth : 0);
+
590    var height = max(html.scrollHeight, html.clientHeight, body ? body.scrollHeight : 0, body ? body.clientHeight : 0);
+
591    var x = -winScroll.scrollLeft + getWindowScrollBarX(element);
+
592    var y = -winScroll.scrollTop;
+
593
+
594    if (getComputedStyle(body || html).direction === 'rtl') {
+
595      x += max(html.clientWidth, body ? body.clientWidth : 0) - width;
+
596    }
+
597
+
598    return {
+
599      width: width,
+
600      height: height,
+
601      x: x,
+
602      y: y
+
603    };
+
604  }
+
605
+
606  function contains(parent, child) {
+
607    var rootNode = child.getRootNode && child.getRootNode(); // First, attempt with faster native method
+
608
+
609    if (parent.contains(child)) {
+
610      return true;
+
611    } // then fallback to custom implementation with Shadow DOM support
+
612    else if (rootNode && isShadowRoot(rootNode)) {
+
613        var next = child;
+
614
+
615        do {
+
616          if (next && parent.isSameNode(next)) {
+
617            return true;
+
618          } // $FlowFixMe[prop-missing]: need a better way to handle this...
+
619
+
620
+
621          next = next.parentNode || next.host;
+
622        } while (next);
+
623      } // Give up, the result is false
+
624
+
625
+
626    return false;
+
627  }
+
628
+
629  function rectToClientRect(rect) {
+
630    return Object.assign({}, rect, {
+
631      left: rect.x,
+
632      top: rect.y,
+
633      right: rect.x + rect.width,
+
634      bottom: rect.y + rect.height
+
635    });
+
636  }
+
637
+
638  function getInnerBoundingClientRect(element) {
+
639    var rect = getBoundingClientRect(element);
+
640    rect.top = rect.top + element.clientTop;
+
641    rect.left = rect.left + element.clientLeft;
+
642    rect.bottom = rect.top + element.clientHeight;
+
643    rect.right = rect.left + element.clientWidth;
+
644    rect.width = element.clientWidth;
+
645    rect.height = element.clientHeight;
+
646    rect.x = rect.left;
+
647    rect.y = rect.top;
+
648    return rect;
+
649  }
+
650
+
651  function getClientRectFromMixedType(element, clippingParent) {
+
652    return clippingParent === viewport ? rectToClientRect(getViewportRect(element)) : isElement(clippingParent) ? getInnerBoundingClientRect(clippingParent) : rectToClientRect(getDocumentRect(getDocumentElement(element)));
+
653  } // A "clipping parent" is an overflowable container with the characteristic of
+
654  // clipping (or hiding) overflowing elements with a position different from
+
655  // `initial`
+
656
+
657
+
658  function getClippingParents(element) {
+
659    var clippingParents = listScrollParents(getParentNode(element));
+
660    var canEscapeClipping = ['absolute', 'fixed'].indexOf(getComputedStyle(element).position) >= 0;
+
661    var clipperElement = canEscapeClipping && isHTMLElement(element) ? getOffsetParent(element) : element;
+
662
+
663    if (!isElement(clipperElement)) {
+
664      return [];
+
665    } // $FlowFixMe[incompatible-return]: https://github.com/facebook/flow/issues/1414
+
666
+
667
+
668    return clippingParents.filter(function (clippingParent) {
+
669      return isElement(clippingParent) && contains(clippingParent, clipperElement) && getNodeName(clippingParent) !== 'body';
+
670    });
+
671  } // Gets the maximum area that the element is visible in due to any number of
+
672  // clipping parents
+
673
+
674
+
675  function getClippingRect(element, boundary, rootBoundary) {
+
676    var mainClippingParents = boundary === 'clippingParents' ? getClippingParents(element) : [].concat(boundary);
+
677    var clippingParents = [].concat(mainClippingParents, [rootBoundary]);
+
678    var firstClippingParent = clippingParents[0];
+
679    var clippingRect = clippingParents.reduce(function (accRect, clippingParent) {
+
680      var rect = getClientRectFromMixedType(element, clippingParent);
+
681      accRect.top = max(rect.top, accRect.top);
+
682      accRect.right = min(rect.right, accRect.right);
+
683      accRect.bottom = min(rect.bottom, accRect.bottom);
+
684      accRect.left = max(rect.left, accRect.left);
+
685      return accRect;
+
686    }, getClientRectFromMixedType(element, firstClippingParent));
+
687    clippingRect.width = clippingRect.right - clippingRect.left;
+
688    clippingRect.height = clippingRect.bottom - clippingRect.top;
+
689    clippingRect.x = clippingRect.left;
+
690    clippingRect.y = clippingRect.top;
+
691    return clippingRect;
+
692  }
+
693
+
694  function getVariation(placement) {
+
695    return placement.split('-')[1];
+
696  }
+
697
+
698  function getMainAxisFromPlacement(placement) {
+
699    return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';
+
700  }
+
701
+
702  function computeOffsets(_ref) {
+
703    var reference = _ref.reference,
+
704        element = _ref.element,
+
705        placement = _ref.placement;
+
706    var basePlacement = placement ? getBasePlacement(placement) : null;
+
707    var variation = placement ? getVariation(placement) : null;
+
708    var commonX = reference.x + reference.width / 2 - element.width / 2;
+
709    var commonY = reference.y + reference.height / 2 - element.height / 2;
+
710    var offsets;
+
711
+
712    switch (basePlacement) {
+
713      case top:
+
714        offsets = {
+
715          x: commonX,
+
716          y: reference.y - element.height
+
717        };
+
718        break;
+
719
+
720      case bottom:
+
721        offsets = {
+
722          x: commonX,
+
723          y: reference.y + reference.height
+
724        };
+
725        break;
+
726
+
727      case right:
+
728        offsets = {
+
729          x: reference.x + reference.width,
+
730          y: commonY
+
731        };
+
732        break;
+
733
+
734      case left:
+
735        offsets = {
+
736          x: reference.x - element.width,
+
737          y: commonY
+
738        };
+
739        break;
+
740
+
741      default:
+
742        offsets = {
+
743          x: reference.x,
+
744          y: reference.y
+
745        };
+
746    }
+
747
+
748    var mainAxis = basePlacement ? getMainAxisFromPlacement(basePlacement) : null;
+
749
+
750    if (mainAxis != null) {
+
751      var len = mainAxis === 'y' ? 'height' : 'width';
+
752
+
753      switch (variation) {
+
754        case start:
+
755          offsets[mainAxis] = offsets[mainAxis] - (reference[len] / 2 - element[len] / 2);
+
756          break;
+
757
+
758        case end:
+
759          offsets[mainAxis] = offsets[mainAxis] + (reference[len] / 2 - element[len] / 2);
+
760          break;
+
761      }
+
762    }
+
763
+
764    return offsets;
+
765  }
+
766
+
767  function getFreshSideObject() {
+
768    return {
+
769      top: 0,
+
770      right: 0,
+
771      bottom: 0,
+
772      left: 0
+
773    };
+
774  }
+
775
+
776  function mergePaddingObject(paddingObject) {
+
777    return Object.assign({}, getFreshSideObject(), paddingObject);
+
778  }
+
779
+
780  function expandToHashMap(value, keys) {
+
781    return keys.reduce(function (hashMap, key) {
+
782      hashMap[key] = value;
+
783      return hashMap;
+
784    }, {});
+
785  }
+
786
+
787  function detectOverflow(state, options) {
+
788    if (options === void 0) {
+
789      options = {};
+
790    }
+
791
+
792    var _options = options,
+
793        _options$placement = _options.placement,
+
794        placement = _options$placement === void 0 ? state.placement : _options$placement,
+
795        _options$boundary = _options.boundary,
+
796        boundary = _options$boundary === void 0 ? clippingParents : _options$boundary,
+
797        _options$rootBoundary = _options.rootBoundary,
+
798        rootBoundary = _options$rootBoundary === void 0 ? viewport : _options$rootBoundary,
+
799        _options$elementConte = _options.elementContext,
+
800        elementContext = _options$elementConte === void 0 ? popper : _options$elementConte,
+
801        _options$altBoundary = _options.altBoundary,
+
802        altBoundary = _options$altBoundary === void 0 ? false : _options$altBoundary,
+
803        _options$padding = _options.padding,
+
804        padding = _options$padding === void 0 ? 0 : _options$padding;
+
805    var paddingObject = mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements));
+
806    var altContext = elementContext === popper ? reference : popper;
+
807    var popperRect = state.rects.popper;
+
808    var element = state.elements[altBoundary ? altContext : elementContext];
+
809    var clippingClientRect = getClippingRect(isElement(element) ? element : element.contextElement || getDocumentElement(state.elements.popper), boundary, rootBoundary);
+
810    var referenceClientRect = getBoundingClientRect(state.elements.reference);
+
811    var popperOffsets = computeOffsets({
+
812      reference: referenceClientRect,
+
813      element: popperRect,
+
814      strategy: 'absolute',
+
815      placement: placement
+
816    });
+
817    var popperClientRect = rectToClientRect(Object.assign({}, popperRect, popperOffsets));
+
818    var elementClientRect = elementContext === popper ? popperClientRect : referenceClientRect; // positive = overflowing the clipping rect
+
819    // 0 or negative = within the clipping rect
+
820
+
821    var overflowOffsets = {
+
822      top: clippingClientRect.top - elementClientRect.top + paddingObject.top,
+
823      bottom: elementClientRect.bottom - clippingClientRect.bottom + paddingObject.bottom,
+
824      left: clippingClientRect.left - elementClientRect.left + paddingObject.left,
+
825      right: elementClientRect.right - clippingClientRect.right + paddingObject.right
+
826    };
+
827    var offsetData = state.modifiersData.offset; // Offsets can be applied only to the popper element
+
828
+
829    if (elementContext === popper && offsetData) {
+
830      var offset = offsetData[placement];
+
831      Object.keys(overflowOffsets).forEach(function (key) {
+
832        var multiply = [right, bottom].indexOf(key) >= 0 ? 1 : -1;
+
833        var axis = [top, bottom].indexOf(key) >= 0 ? 'y' : 'x';
+
834        overflowOffsets[key] += offset[axis] * multiply;
+
835      });
+
836    }
+
837
+
838    return overflowOffsets;
+
839  }
+
840
+
841  var INVALID_ELEMENT_ERROR = 'Popper: Invalid reference or popper argument provided. They must be either a DOM element or virtual element.';
+
842  var INFINITE_LOOP_ERROR = 'Popper: An infinite loop in the modifiers cycle has been detected! The cycle has been interrupted to prevent a browser crash.';
+
843  var DEFAULT_OPTIONS = {
+
844    placement: 'bottom',
+
845    modifiers: [],
+
846    strategy: 'absolute'
+
847  };
+
848
+
849  function areValidElements() {
+
850    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+
851      args[_key] = arguments[_key];
+
852    }
+
853
+
854    return !args.some(function (element) {
+
855      return !(element && typeof element.getBoundingClientRect === 'function');
+
856    });
+
857  }
+
858
+
859  function popperGenerator(generatorOptions) {
+
860    if (generatorOptions === void 0) {
+
861      generatorOptions = {};
+
862    }
+
863
+
864    var _generatorOptions = generatorOptions,
+
865        _generatorOptions$def = _generatorOptions.defaultModifiers,
+
866        defaultModifiers = _generatorOptions$def === void 0 ? [] : _generatorOptions$def,
+
867        _generatorOptions$def2 = _generatorOptions.defaultOptions,
+
868        defaultOptions = _generatorOptions$def2 === void 0 ? DEFAULT_OPTIONS : _generatorOptions$def2;
+
869    return function createPopper(reference, popper, options) {
+
870      if (options === void 0) {
+
871        options = defaultOptions;
+
872      }
+
873
+
874      var state = {
+
875        placement: 'bottom',
+
876        orderedModifiers: [],
+
877        options: Object.assign({}, DEFAULT_OPTIONS, defaultOptions),
+
878        modifiersData: {},
+
879        elements: {
+
880          reference: reference,
+
881          popper: popper
+
882        },
+
883        attributes: {},
+
884        styles: {}
+
885      };
+
886      var effectCleanupFns = [];
+
887      var isDestroyed = false;
+
888      var instance = {
+
889        state: state,
+
890        setOptions: function setOptions(setOptionsAction) {
+
891          var options = typeof setOptionsAction === 'function' ? setOptionsAction(state.options) : setOptionsAction;
+
892          cleanupModifierEffects();
+
893          state.options = Object.assign({}, defaultOptions, state.options, options);
+
894          state.scrollParents = {
+
895            reference: isElement(reference) ? listScrollParents(reference) : reference.contextElement ? listScrollParents(reference.contextElement) : [],
+
896            popper: listScrollParents(popper)
+
897          }; // Orders the modifiers based on their dependencies and `phase`
+
898          // properties
+
899
+
900          var orderedModifiers = orderModifiers(mergeByName([].concat(defaultModifiers, state.options.modifiers))); // Strip out disabled modifiers
+
901
+
902          state.orderedModifiers = orderedModifiers.filter(function (m) {
+
903            return m.enabled;
+
904          }); // Validate the provided modifiers so that the consumer will get warned
+
905          // if one of the modifiers is invalid for any reason
+
906
+
907          {
+
908            var modifiers = uniqueBy([].concat(orderedModifiers, state.options.modifiers), function (_ref) {
+
909              var name = _ref.name;
+
910              return name;
+
911            });
+
912            validateModifiers(modifiers);
+
913
+
914            if (getBasePlacement(state.options.placement) === auto) {
+
915              var flipModifier = state.orderedModifiers.find(function (_ref2) {
+
916                var name = _ref2.name;
+
917                return name === 'flip';
+
918              });
+
919
+
920              if (!flipModifier) {
+
921                console.error(['Popper: "auto" placements require the "flip" modifier be', 'present and enabled to work.'].join(' '));
+
922              }
+
923            }
+
924
+
925            var _getComputedStyle = getComputedStyle(popper),
+
926                marginTop = _getComputedStyle.marginTop,
+
927                marginRight = _getComputedStyle.marginRight,
+
928                marginBottom = _getComputedStyle.marginBottom,
+
929                marginLeft = _getComputedStyle.marginLeft; // We no longer take into account `margins` on the popper, and it can
+
930            // cause bugs with positioning, so we'll warn the consumer
+
931
+
932
+
933            if ([marginTop, marginRight, marginBottom, marginLeft].some(function (margin) {
+
934              return parseFloat(margin);
+
935            })) {
+
936              console.warn(['Popper: CSS "margin" styles cannot be used to apply padding', 'between the popper and its reference element or boundary.', 'To replicate margin, use the `offset` modifier, as well as', 'the `padding` option in the `preventOverflow` and `flip`', 'modifiers.'].join(' '));
+
937            }
+
938          }
+
939
+
940          runModifierEffects();
+
941          return instance.update();
+
942        },
+
943        // Sync update – it will always be executed, even if not necessary. This
+
944        // is useful for low frequency updates where sync behavior simplifies the
+
945        // logic.
+
946        // For high frequency updates (e.g. `resize` and `scroll` events), always
+
947        // prefer the async Popper#update method
+
948        forceUpdate: function forceUpdate() {
+
949          if (isDestroyed) {
+
950            return;
+
951          }
+
952
+
953          var _state$elements = state.elements,
+
954              reference = _state$elements.reference,
+
955              popper = _state$elements.popper; // Don't proceed if `reference` or `popper` are not valid elements
+
956          // anymore
+
957
+
958          if (!areValidElements(reference, popper)) {
+
959            {
+
960              console.error(INVALID_ELEMENT_ERROR);
+
961            }
+
962
+
963            return;
+
964          } // Store the reference and popper rects to be read by modifiers
+
965
+
966
+
967          state.rects = {
+
968            reference: getCompositeRect(reference, getOffsetParent(popper), state.options.strategy === 'fixed'),
+
969            popper: getLayoutRect(popper)
+
970          }; // Modifiers have the ability to reset the current update cycle. The
+
971          // most common use case for this is the `flip` modifier changing the
+
972          // placement, which then needs to re-run all the modifiers, because the
+
973          // logic was previously ran for the previous placement and is therefore
+
974          // stale/incorrect
+
975
+
976          state.reset = false;
+
977          state.placement = state.options.placement; // On each update cycle, the `modifiersData` property for each modifier
+
978          // is filled with the initial data specified by the modifier. This means
+
979          // it doesn't persist and is fresh on each update.
+
980          // To ensure persistent data, use `${name}#persistent`
+
981
+
982          state.orderedModifiers.forEach(function (modifier) {
+
983            return state.modifiersData[modifier.name] = Object.assign({}, modifier.data);
+
984          });
+
985          var __debug_loops__ = 0;
+
986
+
987          for (var index = 0; index < state.orderedModifiers.length; index++) {
+
988            {
+
989              __debug_loops__ += 1;
+
990
+
991              if (__debug_loops__ > 100) {
+
992                console.error(INFINITE_LOOP_ERROR);
+
993                break;
+
994              }
+
995            }
+
996
+
997            if (state.reset === true) {
+
998              state.reset = false;
+
999              index = -1;
+
1000              continue;
+
1001            }
+
1002
+
1003            var _state$orderedModifie = state.orderedModifiers[index],
+
1004                fn = _state$orderedModifie.fn,
+
1005                _state$orderedModifie2 = _state$orderedModifie.options,
+
1006                _options = _state$orderedModifie2 === void 0 ? {} : _state$orderedModifie2,
+
1007                name = _state$orderedModifie.name;
+
1008
+
1009            if (typeof fn === 'function') {
+
1010              state = fn({
+
1011                state: state,
+
1012                options: _options,
+
1013                name: name,
+
1014                instance: instance
+
1015              }) || state;
+
1016            }
+
1017          }
+
1018        },
+
1019        // Async and optimistically optimized update – it will not be executed if
+
1020        // not necessary (debounced to run at most once-per-tick)
+
1021        update: debounce(function () {
+
1022          return new Promise(function (resolve) {
+
1023            instance.forceUpdate();
+
1024            resolve(state);
+
1025          });
+
1026        }),
+
1027        destroy: function destroy() {
+
1028          cleanupModifierEffects();
+
1029          isDestroyed = true;
+
1030        }
+
1031      };
+
1032
+
1033      if (!areValidElements(reference, popper)) {
+
1034        {
+
1035          console.error(INVALID_ELEMENT_ERROR);
+
1036        }
+
1037
+
1038        return instance;
+
1039      }
+
1040
+
1041      instance.setOptions(options).then(function (state) {
+
1042        if (!isDestroyed && options.onFirstUpdate) {
+
1043          options.onFirstUpdate(state);
+
1044        }
+
1045      }); // Modifiers have the ability to execute arbitrary code before the first
+
1046      // update cycle runs. They will be executed in the same order as the update
+
1047      // cycle. This is useful when a modifier adds some persistent data that
+
1048      // other modifiers need to use, but the modifier is run after the dependent
+
1049      // one.
+
1050
+
1051      function runModifierEffects() {
+
1052        state.orderedModifiers.forEach(function (_ref3) {
+
1053          var name = _ref3.name,
+
1054              _ref3$options = _ref3.options,
+
1055              options = _ref3$options === void 0 ? {} : _ref3$options,
+
1056              effect = _ref3.effect;
+
1057
+
1058          if (typeof effect === 'function') {
+
1059            var cleanupFn = effect({
+
1060              state: state,
+
1061              name: name,
+
1062              instance: instance,
+
1063              options: options
+
1064            });
+
1065
+
1066            var noopFn = function noopFn() {};
+
1067
+
1068            effectCleanupFns.push(cleanupFn || noopFn);
+
1069          }
+
1070        });
+
1071      }
+
1072
+
1073      function cleanupModifierEffects() {
+
1074        effectCleanupFns.forEach(function (fn) {
+
1075          return fn();
+
1076        });
+
1077        effectCleanupFns = [];
+
1078      }
+
1079
+
1080      return instance;
+
1081    };
+
1082  }
+
1083  var createPopper = /*#__PURE__*/popperGenerator(); // eslint-disable-next-line import/no-unused-modules
+
1084
+
1085  exports.createPopper = createPopper;
+
1086  exports.detectOverflow = detectOverflow;
+
1087  exports.popperGenerator = popperGenerator;
+
1088
+
1089  Object.defineProperty(exports, '__esModule', { value: true });
+
1090
+
1091})));
+
1092//# sourceMappingURL=popper-base.js.map
+