secure-sharing/SecureSharing/wwwroot/plugins/popper/umd/popper-utils.js

/**!
 * @fileOverview Kickass library to create and place poppers near their reference elements.
 * @version 1.16.1
 * @license
 * Copyright (c) 2016 Federico Zivolo and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
        typeof define === 'function' && define.amd ? define(['exports'], factory) :
            (factory((global.PopperUtils = {})));
}(this, (function (exports) {
    'use strict';

    /**
     * Get CSS computed property of the given element
     * @method
     * @memberof Popper.Utils
     * @argument {Eement} element
     * @argument {String} property
     */
    function getStyleComputedProperty(element, property) {
        if (element.nodeType !== 1) {
            return [];
        }
        // NOTE: 1 DOM access here
        var window = element.ownerDocument.defaultView;
        var css = window.getComputedStyle(element, null);
        return property ? css[property] : css;
    }

    /**
     * Returns the parentNode or the host of the element
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @returns {Element} parent
     */
    function getParentNode(element) {
        if (element.nodeName === 'HTML') {
            return element;
        }
        return element.parentNode || element.host;
    }

    /**
     * Returns the scrolling parent of the given element
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @returns {Element} scroll parent
     */
    function getScrollParent(element) {
        // Return body, `getScroll` will take care to get the correct `scrollTop` from it
        if (!element) {
            return document.body;
        }

        switch (element.nodeName) {
            case 'HTML':
            case 'BODY':
                return element.ownerDocument.body;
            case '#document':
                return element.body;
        }

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

        var _getStyleComputedProp = getStyleComputedProperty(element),
            overflow = _getStyleComputedProp.overflow,
            overflowX = _getStyleComputedProp.overflowX,
            overflowY = _getStyleComputedProp.overflowY;

        if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
            return element;
        }

        return getScrollParent(getParentNode(element));
    }

    /**
     * Returns the reference node of the reference object, or the reference object itself.
     * @method
     * @memberof Popper.Utils
     * @param {Element|Object} reference - the reference element (the popper will be relative to this)
     * @returns {Element} parent
     */
    function getReferenceNode(reference) {
        return reference && reference.referenceNode ? reference.referenceNode : reference;
    }

    var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && typeof navigator !== 'undefined';

    var isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
    var isIE10 = isBrowser && /MSIE 10/.test(navigator.userAgent);

    /**
     * Determines if the browser is Internet Explorer
     * @method
     * @memberof Popper.Utils
     * @param {Number} version to check
     * @returns {Boolean} isIE
     */
    function isIE(version) {
        if (version === 11) {
            return isIE11;
        }
        if (version === 10) {
            return isIE10;
        }
        return isIE11 || isIE10;
    }

    /**
     * Returns the offset parent of the given element
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @returns {Element} offset parent
     */
    function getOffsetParent(element) {
        if (!element) {
            return document.documentElement;
        }

        var noOffsetParent = isIE(10) ? document.body : null;

        // NOTE: 1 DOM access here
        var offsetParent = element.offsetParent || null;
        // Skip hidden elements which don't have an offsetParent
        while (offsetParent === noOffsetParent && element.nextElementSibling) {
            offsetParent = (element = element.nextElementSibling).offsetParent;
        }

        var nodeName = offsetParent && offsetParent.nodeName;

        if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
            return element ? element.ownerDocument.documentElement : document.documentElement;
        }

        // .offsetParent will return the closest TH, TD or TABLE in case
        // no offsetParent is present, I hate this job...
        if (['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
            return getOffsetParent(offsetParent);
        }

        return offsetParent;
    }

    function isOffsetContainer(element) {
        var nodeName = element.nodeName;

        if (nodeName === 'BODY') {
            return false;
        }
        return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
    }

    /**
     * Finds the root node (document, shadowDOM root) of the given element
     * @method
     * @memberof Popper.Utils
     * @argument {Element} node
     * @returns {Element} root node
     */
    function getRoot(node) {
        if (node.parentNode !== null) {
            return getRoot(node.parentNode);
        }

        return node;
    }

    /**
     * Finds the offset parent common to the two provided nodes
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element1
     * @argument {Element} element2
     * @returns {Element} common offset parent
     */
    function findCommonOffsetParent(element1, element2) {
        // This check is needed to avoid errors in case one of the elements isn't defined for any reason
        if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
            return document.documentElement;
        }

        // Here we make sure to give as "start" the element that comes first in the DOM
        var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
        var start = order ? element1 : element2;
        var end = order ? element2 : element1;

        // Get common ancestor container
        var range = document.createRange();
        range.setStart(start, 0);
        range.setEnd(end, 0);
        var commonAncestorContainer = range.commonAncestorContainer;

        // Both nodes are inside #document

        if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
            if (isOffsetContainer(commonAncestorContainer)) {
                return commonAncestorContainer;
            }

            return getOffsetParent(commonAncestorContainer);
        }

        // one of the nodes is inside shadowDOM, find which one
        var element1root = getRoot(element1);
        if (element1root.host) {
            return findCommonOffsetParent(element1root.host, element2);
        } else {
            return findCommonOffsetParent(element1, getRoot(element2).host);
        }
    }

    /**
     * Gets the scroll value of the given element in the given side (top and left)
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @argument {String} side `top` or `left`
     * @returns {number} amount of scrolled pixels
     */
    function getScroll(element) {
        var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';

        var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
        var nodeName = element.nodeName;

        if (nodeName === 'BODY' || nodeName === 'HTML') {
            var html = element.ownerDocument.documentElement;
            var scrollingElement = element.ownerDocument.scrollingElement || html;
            return scrollingElement[upperSide];
        }

        return element[upperSide];
    }

    /*
     * Sum or subtract the element scroll values (left and top) from a given rect object
     * @method
     * @memberof Popper.Utils
     * @param {Object} rect - Rect object you want to change
     * @param {HTMLElement} element - The element from the function reads the scroll values
     * @param {Boolean} subtract - set to true if you want to subtract the scroll values
     * @return {Object} rect - The modifier rect object
     */
    function includeScroll(rect, element) {
        var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;

        var scrollTop = getScroll(element, 'top');
        var scrollLeft = getScroll(element, 'left');
        var modifier = subtract ? -1 : 1;
        rect.top += scrollTop * modifier;
        rect.bottom += scrollTop * modifier;
        rect.left += scrollLeft * modifier;
        rect.right += scrollLeft * modifier;
        return rect;
    }

    /*
     * Helper to detect borders of a given element
     * @method
     * @memberof Popper.Utils
     * @param {CSSStyleDeclaration} styles
     * Result of `getStyleComputedProperty` on the given element
     * @param {String} axis - `x` or `y`
     * @return {number} borders - The borders size of the given axis
     */

    function getBordersSize(styles, axis) {
        var sideA = axis === 'x' ? 'Left' : 'Top';
        var sideB = sideA === 'Left' ? 'Right' : 'Bottom';

        return parseFloat(styles['border' + sideA + 'Width']) + parseFloat(styles['border' + sideB + 'Width']);
    }

    function getSize(axis, body, html, computedStyle) {
        return Math.max(body['offset' + axis], body['scroll' + axis], html['client' + axis], html['offset' + axis], html['scroll' + axis], isIE(10) ? parseInt(html['offset' + axis]) + parseInt(computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')]) + parseInt(computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')]) : 0);
    }

    function getWindowSizes(document) {
        var body = document.body;
        var html = document.documentElement;
        var computedStyle = isIE(10) && getComputedStyle(html);

        return {
            height: getSize('Height', body, html, computedStyle),
            width: getSize('Width', body, html, computedStyle)
        };
    }

    var _extends = Object.assign || function (target) {
        for (var i = 1; i < arguments.length; i++) {
            var source = arguments[i];

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

        return target;
    };

    /**
     * Given element offsets, generate an output similar to getBoundingClientRect
     * @method
     * @memberof Popper.Utils
     * @argument {Object} offsets
     * @returns {Object} ClientRect like output
     */
    function getClientRect(offsets) {
        return _extends({}, offsets, {
            right: offsets.left + offsets.width,
            bottom: offsets.top + offsets.height
        });
    }

    /**
     * Get bounding client rect of given element
     * @method
     * @memberof Popper.Utils
     * @param {HTMLElement} element
     * @return {Object} client rect
     */
    function getBoundingClientRect(element) {
        var rect = {};

        // IE10 10 FIX: Please, don't ask, the element isn't
        // considered in DOM in some circumstances...
        // This isn't reproducible in IE10 compatibility mode of IE11
        try {
            if (isIE(10)) {
                rect = element.getBoundingClientRect();
                var scrollTop = getScroll(element, 'top');
                var scrollLeft = getScroll(element, 'left');
                rect.top += scrollTop;
                rect.left += scrollLeft;
                rect.bottom += scrollTop;
                rect.right += scrollLeft;
            } else {
                rect = element.getBoundingClientRect();
            }
        } catch (e) {
        }

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

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

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

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

            result.width -= horizScrollbar;
            result.height -= vertScrollbar;
        }

        return getClientRect(result);
    }

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

        var isIE10 = isIE(10);
        var isHTML = parent.nodeName === 'HTML';
        var childrenRect = getBoundingClientRect(children);
        var parentRect = getBoundingClientRect(parent);
        var scrollParent = getScrollParent(children);

        var styles = getStyleComputedProperty(parent);
        var borderTopWidth = parseFloat(styles.borderTopWidth);
        var borderLeftWidth = parseFloat(styles.borderLeftWidth);

        // In cases where the parent is fixed, we must ignore negative scroll in offset calc
        if (fixedPosition && isHTML) {
            parentRect.top = Math.max(parentRect.top, 0);
            parentRect.left = Math.max(parentRect.left, 0);
        }
        var offsets = getClientRect({
            top: childrenRect.top - parentRect.top - borderTopWidth,
            left: childrenRect.left - parentRect.left - borderLeftWidth,
            width: childrenRect.width,
            height: childrenRect.height
        });
        offsets.marginTop = 0;
        offsets.marginLeft = 0;

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

            offsets.top -= borderTopWidth - marginTop;
            offsets.bottom -= borderTopWidth - marginTop;
            offsets.left -= borderLeftWidth - marginLeft;
            offsets.right -= borderLeftWidth - marginLeft;

            // Attach marginTop and marginLeft because in some circumstances we may need them
            offsets.marginTop = marginTop;
            offsets.marginLeft = marginLeft;
        }

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

        return offsets;
    }

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

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

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

        var offset = {
            top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
            left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
            width: width,
            height: height
        };

        return getClientRect(offset);
    }

    /**
     * Check if the given element is fixed or is inside a fixed parent
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @argument {Element} customContainer
     * @returns {Boolean} answer to "isFixed?"
     */
    function isFixed(element) {
        var nodeName = element.nodeName;
        if (nodeName === 'BODY' || nodeName === 'HTML') {
            return false;
        }
        if (getStyleComputedProperty(element, 'position') === 'fixed') {
            return true;
        }
        var parentNode = getParentNode(element);
        if (!parentNode) {
            return false;
        }
        return isFixed(parentNode);
    }

    /**
     * Finds the first parent of an element that has a transformed property defined
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @returns {Element} first transformed parent or documentElement
     */

    function getFixedPositionOffsetParent(element) {
        // This check is needed to avoid errors in case one of the elements isn't defined for any reason
        if (!element || !element.parentElement || isIE()) {
            return document.documentElement;
        }
        var el = element.parentElement;
        while (el && getStyleComputedProperty(el, 'transform') === 'none') {
            el = el.parentElement;
        }
        return el || document.documentElement;
    }

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

        // NOTE: 1 DOM access here

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

        // Handle viewport case
        if (boundariesElement === 'viewport') {
            boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent, fixedPosition);
        } else {
            // Handle other cases based on DOM element used as boundaries
            var boundariesNode = void 0;
            if (boundariesElement === 'scrollParent') {
                boundariesNode = getScrollParent(getParentNode(reference));
                if (boundariesNode.nodeName === 'BODY') {
                    boundariesNode = popper.ownerDocument.documentElement;
                }
            } else if (boundariesElement === 'window') {
                boundariesNode = popper.ownerDocument.documentElement;
            } else {
                boundariesNode = boundariesElement;
            }

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

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

                boundaries.top += offsets.top - offsets.marginTop;
                boundaries.bottom = height + offsets.top;
                boundaries.left += offsets.left - offsets.marginLeft;
                boundaries.right = width + offsets.left;
            } else {
                // for all the other DOM elements, this one is good
                boundaries = offsets;
            }
        }

        // Add paddings
        padding = padding || 0;
        var isPaddingNumber = typeof padding === 'number';
        boundaries.left += isPaddingNumber ? padding : padding.left || 0;
        boundaries.top += isPaddingNumber ? padding : padding.top || 0;
        boundaries.right -= isPaddingNumber ? padding : padding.right || 0;
        boundaries.bottom -= isPaddingNumber ? padding : padding.bottom || 0;

        return boundaries;
    }

    function getArea(_ref) {
        var width = _ref.width,
            height = _ref.height;

        return width * height;
    }

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

        if (placement.indexOf('auto') === -1) {
            return placement;
        }

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

        var rects = {
            top: {
                width: boundaries.width,
                height: refRect.top - boundaries.top
            },
            right: {
                width: boundaries.right - refRect.right,
                height: boundaries.height
            },
            bottom: {
                width: boundaries.width,
                height: boundaries.bottom - refRect.bottom
            },
            left: {
                width: refRect.left - boundaries.left,
                height: boundaries.height
            }
        };

        var sortedAreas = Object.keys(rects).map(function (key) {
            return _extends({
                key: key
            }, rects[key], {
                area: getArea(rects[key])
            });
        }).sort(function (a, b) {
            return b.area - a.area;
        });

        var filteredAreas = sortedAreas.filter(function (_ref2) {
            var width = _ref2.width,
                height = _ref2.height;
            return width >= popper.clientWidth && height >= popper.clientHeight;
        });

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

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

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

    var timeoutDuration = function () {
        var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
        for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
            if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
                return 1;
            }
        }
        return 0;
    }();

    function microtaskDebounce(fn) {
        var called = false;
        return function () {
            if (called) {
                return;
            }
            called = true;
            window.Promise.resolve().then(function () {
                called = false;
                fn();
            });
        };
    }

    function taskDebounce(fn) {
        var scheduled = false;
        return function () {
            if (!scheduled) {
                scheduled = true;
                setTimeout(function () {
                    scheduled = false;
                    fn();
                }, timeoutDuration);
            }
        };
    }

    var supportsMicroTasks = isBrowser && window.Promise;

    /**
     * Create a debounced version of a method, that's asynchronously deferred
     * but called in the minimum time possible.
     *
     * @method
     * @memberof Popper.Utils
     * @argument {Function} fn
     * @returns {Function}
     */
    var debounce = supportsMicroTasks ? microtaskDebounce : taskDebounce;

    /**
     * Mimics the `find` method of Array
     * @method
     * @memberof Popper.Utils
     * @argument {Array} arr
     * @argument prop
     * @argument value
     * @returns index or -1
     */
    function find(arr, check) {
        // use native find if supported
        if (Array.prototype.find) {
            return arr.find(check);
        }

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

    /**
     * Return the index of the matching object
     * @method
     * @memberof Popper.Utils
     * @argument {Array} arr
     * @argument prop
     * @argument value
     * @returns index or -1
     */
    function findIndex(arr, prop, value) {
        // use native findIndex if supported
        if (Array.prototype.findIndex) {
            return arr.findIndex(function (cur) {
                return cur[prop] === value;
            });
        }

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

    /**
     * Get the position of the given element, relative to its offset parent
     * @method
     * @memberof Popper.Utils
     * @param {Element} element
     * @return {Object} position - Coordinates of the element and its `scrollTop`
     */
    function getOffsetRect(element) {
        var elementRect = void 0;
        if (element.nodeName === 'HTML') {
            var _getWindowSizes = getWindowSizes(element.ownerDocument),
                width = _getWindowSizes.width,
                height = _getWindowSizes.height;

            elementRect = {
                width: width,
                height: height,
                left: 0,
                top: 0
            };
        } else {
            elementRect = {
                width: element.offsetWidth,
                height: element.offsetHeight,
                left: element.offsetLeft,
                top: element.offsetTop
            };
        }

        // position
        return getClientRect(elementRect);
    }

    /**
     * Get the outer sizes of the given element (offset size + margins)
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element
     * @returns {Object} object containing width and height properties
     */
    function getOuterSizes(element) {
        var window = element.ownerDocument.defaultView;
        var styles = window.getComputedStyle(element);
        var x = parseFloat(styles.marginTop || 0) + parseFloat(styles.marginBottom || 0);
        var y = parseFloat(styles.marginLeft || 0) + parseFloat(styles.marginRight || 0);
        var result = {
            width: element.offsetWidth + y,
            height: element.offsetHeight + x
        };
        return result;
    }

    /**
     * Get the opposite placement of the given one
     * @method
     * @memberof Popper.Utils
     * @argument {String} placement
     * @returns {String} flipped placement
     */
    function getOppositePlacement(placement) {
        var hash = {left: 'right', right: 'left', bottom: 'top', top: 'bottom'};
        return placement.replace(/left|right|bottom|top/g, function (matched) {
            return hash[matched];
        });
    }

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

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

        // Add position, width and height to our offsets object
        var popperOffsets = {
            width: popperRect.width,
            height: popperRect.height
        };

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

        popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
        if (placement === secondarySide) {
            popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
        } else {
            popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
        }

        return popperOffsets;
    }

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

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

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

        for (var i = 0; i < prefixes.length; i++) {
            var prefix = prefixes[i];
            var toCheck = prefix ? '' + prefix + upperProp : property;
            if (typeof document.body.style[toCheck] !== 'undefined') {
                return toCheck;
            }
        }
        return null;
    }

    /**
     * Check if the given variable is a function
     * @method
     * @memberof Popper.Utils
     * @argument {Any} functionToCheck - variable to check
     * @returns {Boolean} answer to: is a function?
     */
    function isFunction(functionToCheck) {
        var getType = {};
        return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
    }

    /**
     * Helper used to know if the given modifier is enabled.
     * @method
     * @memberof Popper.Utils
     * @returns {Boolean}
     */
    function isModifierEnabled(modifiers, modifierName) {
        return modifiers.some(function (_ref) {
            var name = _ref.name,
                enabled = _ref.enabled;
            return enabled && name === modifierName;
        });
    }

    /**
     * Helper used to know if the given modifier depends from another one.<br />
     * It checks if the needed modifier is listed and enabled.
     * @method
     * @memberof Popper.Utils
     * @param {Array} modifiers - list of modifiers
     * @param {String} requestingName - name of requesting modifier
     * @param {String} requestedName - name of requested modifier
     * @returns {Boolean}
     */
    function isModifierRequired(modifiers, requestingName, requestedName) {
        var requesting = find(modifiers, function (_ref) {
            var name = _ref.name;
            return name === requestingName;
        });

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

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

    /**
     * Tells if a given input is a number
     * @method
     * @memberof Popper.Utils
     * @param {*} input to check
     * @return {Boolean}
     */
    function isNumeric(n) {
        return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
    }

    /**
     * Get the window associated with the element
     * @argument {Element} element
     * @returns {Window}
     */
    function getWindow(element) {
        var ownerDocument = element.ownerDocument;
        return ownerDocument ? ownerDocument.defaultView : window;
    }

    /**
     * Remove event listeners used to update the popper position
     * @method
     * @memberof Popper.Utils
     * @private
     */
    function removeEventListeners(reference, state) {
        // Remove resize event listener on window
        getWindow(reference).removeEventListener('resize', state.updateBound);

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

        // Reset state
        state.updateBound = null;
        state.scrollParents = [];
        state.scrollElement = null;
        state.eventsEnabled = false;
        return state;
    }

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

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

                data = fn(data, modifier);
            }
        });

        return data;
    }

    /**
     * Set the attributes to the given popper
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element - Element to apply the attributes to
     * @argument {Object} styles
     * Object with a list of properties and values which will be applied to the element
     */
    function setAttributes(element, attributes) {
        Object.keys(attributes).forEach(function (prop) {
            var value = attributes[prop];
            if (value !== false) {
                element.setAttribute(prop, attributes[prop]);
            } else {
                element.removeAttribute(prop);
            }
        });
    }

    /**
     * Set the style to the given popper
     * @method
     * @memberof Popper.Utils
     * @argument {Element} element - Element to apply the style to
     * @argument {Object} styles
     * Object with a list of properties and values which will be applied to the element
     */
    function setStyles(element, styles) {
        Object.keys(styles).forEach(function (prop) {
            var unit = '';
            // add unit if the value is numeric and is one of the following
            if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
                unit = 'px';
            }
            element.style[prop] = styles[prop] + unit;
        });
    }

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

        if (!isBody) {
            attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
        }
        scrollParents.push(target);
    }

    /**
     * Setup needed event listeners used to update the popper position
     * @method
     * @memberof Popper.Utils
     * @private
     */
    function setupEventListeners(reference, options, state, updateBound) {
        // Resize event listener on window
        state.updateBound = updateBound;
        getWindow(reference).addEventListener('resize', state.updateBound, {passive: true});

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

        return state;
    }

// This is here just for backward compatibility with versions lower than v1.10.3
// you should import the utilities using named exports, if you want them all use:
// ```
// import * as PopperUtils from 'popper-utils';
// ```
// The default export will be removed in the next major version.
    var index = {
        computeAutoPlacement: computeAutoPlacement,
        debounce: debounce,
        findIndex: findIndex,
        getBordersSize: getBordersSize,
        getBoundaries: getBoundaries,
        getBoundingClientRect: getBoundingClientRect,
        getClientRect: getClientRect,
        getOffsetParent: getOffsetParent,
        getOffsetRect: getOffsetRect,
        getOffsetRectRelativeToArbitraryNode: getOffsetRectRelativeToArbitraryNode,
        getOuterSizes: getOuterSizes,
        getParentNode: getParentNode,
        getPopperOffsets: getPopperOffsets,
        getReferenceOffsets: getReferenceOffsets,
        getScroll: getScroll,
        getScrollParent: getScrollParent,
        getStyleComputedProperty: getStyleComputedProperty,
        getSupportedPropertyName: getSupportedPropertyName,
        getWindowSizes: getWindowSizes,
        isFixed: isFixed,
        isFunction: isFunction,
        isModifierEnabled: isModifierEnabled,
        isModifierRequired: isModifierRequired,
        isNumeric: isNumeric,
        removeEventListeners: removeEventListeners,
        runModifiers: runModifiers,
        setAttributes: setAttributes,
        setStyles: setStyles,
        setupEventListeners: setupEventListeners
    };

    exports.computeAutoPlacement = computeAutoPlacement;
    exports.debounce = debounce;
    exports.findIndex = findIndex;
    exports.getBordersSize = getBordersSize;
    exports.getBoundaries = getBoundaries;
    exports.getBoundingClientRect = getBoundingClientRect;
    exports.getClientRect = getClientRect;
    exports.getOffsetParent = getOffsetParent;
    exports.getOffsetRect = getOffsetRect;
    exports.getOffsetRectRelativeToArbitraryNode = getOffsetRectRelativeToArbitraryNode;
    exports.getOuterSizes = getOuterSizes;
    exports.getParentNode = getParentNode;
    exports.getPopperOffsets = getPopperOffsets;
    exports.getReferenceOffsets = getReferenceOffsets;
    exports.getScroll = getScroll;
    exports.getScrollParent = getScrollParent;
    exports.getStyleComputedProperty = getStyleComputedProperty;
    exports.getSupportedPropertyName = getSupportedPropertyName;
    exports.getWindowSizes = getWindowSizes;
    exports.isFixed = isFixed;
    exports.isFunction = isFunction;
    exports.isModifierEnabled = isModifierEnabled;
    exports.isModifierRequired = isModifierRequired;
    exports.isNumeric = isNumeric;
    exports.removeEventListeners = removeEventListeners;
    exports.runModifiers = runModifiers;
    exports.setAttributes = setAttributes;
    exports.setStyles = setStyles;
    exports.setupEventListeners = setupEventListeners;
    exports['default'] = index;

    Object.defineProperty(exports, '__esModule', {value: true});

})));
//# sourceMappingURL=popper-utils.js.map