secure-sharing/SecureSharing/wwwroot/plugins/popper/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.
 */
/**
 * 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
    const window = element.ownerDocument.defaultView;
    const 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
    const {overflow, overflowX, overflowY} = getStyleComputedProperty(element);
    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';

const isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
const 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;
    }

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

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

    const 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) {
    const {nodeName} = element;
    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
    const order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
    const start = order ? element1 : element2;
    const end = order ? element2 : element1;

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

    // 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
    const 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, side = 'top') {
    const upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
    const nodeName = element.nodeName;

    if (nodeName === 'BODY' || nodeName === 'HTML') {
        const html = element.ownerDocument.documentElement;
        const 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, subtract = false) {
    const scrollTop = getScroll(element, 'top');
    const scrollLeft = getScroll(element, 'left');
    const 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) {
    const sideA = axis === 'x' ? 'Left' : 'Top';
    const 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) {
    const body = document.body;
    const html = document.documentElement;
    const 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) {
    let 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();
            const scrollTop = getScroll(element, 'top');
            const scrollLeft = getScroll(element, 'left');
            rect.top += scrollTop;
            rect.left += scrollLeft;
            rect.bottom += scrollTop;
            rect.right += scrollLeft;
        } else {
            rect = element.getBoundingClientRect();
        }
    } catch (e) {
    }

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

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

    let horizScrollbar = element.offsetWidth - width;
    let 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) {
        const styles = getStyleComputedProperty(element);
        horizScrollbar -= getBordersSize(styles, 'x');
        vertScrollbar -= getBordersSize(styles, 'y');

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

    return getClientRect(result);
}

function getOffsetRectRelativeToArbitraryNode(children, parent, fixedPosition = false) {
    const isIE10 = isIE(10);
    const isHTML = parent.nodeName === 'HTML';
    const childrenRect = getBoundingClientRect(children);
    const parentRect = getBoundingClientRect(parent);
    const scrollParent = getScrollParent(children);

    const styles = getStyleComputedProperty(parent);
    const borderTopWidth = parseFloat(styles.borderTopWidth);
    const 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);
    }
    let 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) {
        const marginTop = parseFloat(styles.marginTop);
        const 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, excludeScroll = false) {
    const html = element.ownerDocument.documentElement;
    const relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
    const width = Math.max(html.clientWidth, window.innerWidth || 0);
    const height = Math.max(html.clientHeight, window.innerHeight || 0);

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

    const offset = {
        top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
        left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
        width,
        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) {
    const nodeName = element.nodeName;
    if (nodeName === 'BODY' || nodeName === 'HTML') {
        return false;
    }
    if (getStyleComputedProperty(element, 'position') === 'fixed') {
        return true;
    }
    const 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;
    }
    let 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, fixedPosition = false) {
    // NOTE: 1 DOM access here

    let boundaries = {top: 0, left: 0};
    const 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
        let boundariesNode;
        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;
        }

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

        // In case of HTML, we need a different computation
        if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
            const {height, width} = getWindowSizes(popper.ownerDocument);
            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;
    const 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({width, 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, padding = 0) {
    if (placement.indexOf('auto') === -1) {
        return placement;
    }

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

    const 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
        }
    };

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

    const filteredAreas = sortedAreas.filter(({
                                                  width,
                                                  height
                                              }) => width >= popper.clientWidth && height >= popper.clientHeight);

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

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

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

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

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

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

const 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(cur => cur[prop] === value);
    }

    // use `find` + `indexOf` if `findIndex` isn't supported
    const match = find(arr, obj => 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) {
    let elementRect;
    if (element.nodeName === 'HTML') {
        const {width, height} = getWindowSizes(element.ownerDocument);
        elementRect = {
            width,
            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) {
    const window = element.ownerDocument.defaultView;
    const styles = window.getComputedStyle(element);
    const x = parseFloat(styles.marginTop || 0) + parseFloat(styles.marginBottom || 0);
    const y = parseFloat(styles.marginLeft || 0) + parseFloat(styles.marginRight || 0);
    const 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) {
    const hash = {left: 'right', right: 'left', bottom: 'top', top: 'bottom'};
    return placement.replace(/left|right|bottom|top/g, matched => 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
    const popperRect = getOuterSizes(popper);

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

    // depending by the popper placement we have to compute its offsets slightly differently
    const isHoriz = ['right', 'left'].indexOf(placement) !== -1;
    const mainSide = isHoriz ? 'top' : 'left';
    const secondarySide = isHoriz ? 'left' : 'top';
    const measurement = isHoriz ? 'height' : 'width';
    const 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, fixedPosition = null) {
    const 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) {
    const prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
    const upperProp = property.charAt(0).toUpperCase() + property.slice(1);

    for (let i = 0; i < prefixes.length; i++) {
        const prefix = prefixes[i];
        const 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) {
    const 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(({name, enabled}) => 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) {
    const requesting = find(modifiers, ({name}) => name === requestingName);

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

    if (!isRequired) {
        const requesting = `\`${requestingName}\``;
        const requested = `\`${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) {
    const 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(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) {
    const modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));

    modifiersToRun.forEach(modifier => {
        if (modifier['function']) {
            // eslint-disable-line dot-notation
            console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
        }
        const 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) {
        const 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(prop => {
        let 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) {
    const isBody = scrollParent.nodeName === 'BODY';
    const 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
    const 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,
    debounce,
    findIndex,
    getBordersSize,
    getBoundaries,
    getBoundingClientRect,
    getClientRect,
    getOffsetParent,
    getOffsetRect,
    getOffsetRectRelativeToArbitraryNode,
    getOuterSizes,
    getParentNode,
    getPopperOffsets,
    getReferenceOffsets,
    getScroll,
    getScrollParent,
    getStyleComputedProperty,
    getSupportedPropertyName,
    getWindowSizes,
    isFixed,
    isFunction,
    isModifierEnabled,
    isModifierRequired,
    isNumeric,
    removeEventListeners,
    runModifiers,
    setAttributes,
    setStyles,
    setupEventListeners
};

export {
    computeAutoPlacement,
    debounce,
    findIndex,
    getBordersSize,
    getBoundaries,
    getBoundingClientRect,
    getClientRect,
    getOffsetParent,
    getOffsetRect,
    getOffsetRectRelativeToArbitraryNode,
    getOuterSizes,
    getParentNode,
    getPopperOffsets,
    getReferenceOffsets,
    getScroll,
    getScrollParent,
    getStyleComputedProperty,
    getSupportedPropertyName,
    getWindowSizes,
    isFixed,
    isFunction,
    isModifierEnabled,
    isModifierRequired,
    isNumeric,
    removeEventListeners,
    runModifiers,
    setAttributes,
    setStyles,
    setupEventListeners
};
export default index;
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