secure-sharing/SecureSharing/wwwroot/plugins/popper/popper.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.
 */
var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && typeof navigator !== 'undefined';

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;

/**
 * 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]';
}

/**
 * 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;
}

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}` : '');
}

/**
 * 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 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;
}

/**
 * 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);
}

/**
 * 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;
}

/**
 * Updates the position of the popper, computing the new offsets and applying
 * the new style.<br />
 * Prefer `scheduleUpdate` over `update` because of performance reasons.
 * @method
 * @memberof Popper
 */
function update() {
    // if popper is destroyed, don't perform any further update
    if (this.state.isDestroyed) {
        return;
    }

    let data = {
        instance: this,
        styles: {},
        arrowStyles: {},
        attributes: {},
        flipped: false,
        offsets: {}
    };

    // compute reference element offsets
    data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference, this.options.positionFixed);

    // compute auto placement, store placement inside the data object,
    // modifiers will be able to edit `placement` if needed
    // and refer to originalPlacement to know the original value
    data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);

    // store the computed placement inside `originalPlacement`
    data.originalPlacement = data.placement;

    data.positionFixed = this.options.positionFixed;

    // compute the popper offsets
    data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);

    data.offsets.popper.position = this.options.positionFixed ? 'fixed' : 'absolute';

    // run the modifiers
    data = runModifiers(this.modifiers, data);

    // the first `update` will call `onCreate` callback
    // the other ones will call `onUpdate` callback
    if (!this.state.isCreated) {
        this.state.isCreated = true;
        this.options.onCreate(data);
    } else {
        this.options.onUpdate(data);
    }
}

/**
 * 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);
}

/**
 * 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;
}

/**
 * Destroys the popper.
 * @method
 * @memberof Popper
 */
function destroy() {
    this.state.isDestroyed = true;

    // touch DOM only if `applyStyle` modifier is enabled
    if (isModifierEnabled(this.modifiers, 'applyStyle')) {
        this.popper.removeAttribute('x-placement');
        this.popper.style.position = '';
        this.popper.style.top = '';
        this.popper.style.left = '';
        this.popper.style.right = '';
        this.popper.style.bottom = '';
        this.popper.style.willChange = '';
        this.popper.style[getSupportedPropertyName('transform')] = '';
    }

    this.disableEventListeners();

    // remove the popper if user explicitly asked for the deletion on destroy
    // do not use `remove` because IE11 doesn't support it
    if (this.options.removeOnDestroy) {
        this.popper.parentNode.removeChild(this.popper);
    }
    return this;
}

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

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;
}

/**
 * It will add resize/scroll events and start recalculating
 * position of the popper element when they are triggered.
 * @method
 * @memberof Popper
 */
function enableEventListeners() {
    if (!this.state.eventsEnabled) {
        this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
    }
}

/**
 * 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;
}

/**
 * It will remove resize/scroll events and won't recalculate popper position
 * when they are triggered. It also won't trigger `onUpdate` callback anymore,
 * unless you call `update` method manually.
 * @method
 * @memberof Popper
 */
function disableEventListeners() {
    if (this.state.eventsEnabled) {
        cancelAnimationFrame(this.scheduleUpdate);
        this.state = removeEventListeners(this.reference, this.state);
    }
}

/**
 * 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);
}

/**
 * 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;
    });
}

/**
 * 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);
        }
    });
}

/**
 * @function
 * @memberof Modifiers
 * @argument {Object} data - The data object generated by `update` method
 * @argument {Object} data.styles - List of style properties - values to apply to popper element
 * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
 * @argument {Object} options - Modifiers configuration and options
 * @returns {Object} The same data object
 */
function applyStyle(data) {
    // any property present in `data.styles` will be applied to the popper,
    // in this way we can make the 3rd party modifiers add custom styles to it
    // Be aware, modifiers could override the properties defined in the previous
    // lines of this modifier!
    setStyles(data.instance.popper, data.styles);

    // any property present in `data.attributes` will be applied to the popper,
    // they will be set as HTML attributes of the element
    setAttributes(data.instance.popper, data.attributes);

    // if arrowElement is defined and arrowStyles has some properties
    if (data.arrowElement && Object.keys(data.arrowStyles).length) {
        setStyles(data.arrowElement, data.arrowStyles);
    }

    return data;
}

/**
 * Set the x-placement attribute before everything else because it could be used
 * to add margins to the popper margins needs to be calculated to get the
 * correct popper offsets.
 * @method
 * @memberof Popper.modifiers
 * @param {HTMLElement} reference - The reference element used to position the popper
 * @param {HTMLElement} popper - The HTML element used as popper
 * @param {Object} options - Popper.js options
 */
function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
    // compute reference element offsets
    const referenceOffsets = getReferenceOffsets(state, popper, reference, options.positionFixed);

    // compute auto placement, store placement inside the data object,
    // modifiers will be able to edit `placement` if needed
    // and refer to originalPlacement to know the original value
    const placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);

    popper.setAttribute('x-placement', placement);

    // Apply `position` to popper before anything else because
    // without the position applied we can't guarantee correct computations
    setStyles(popper, {position: options.positionFixed ? 'fixed' : 'absolute'});

    return options;
}

/**
 * @function
 * @memberof Popper.Utils
 * @argument {Object} data - The data object generated by `update` method
 * @argument {Boolean} shouldRound - If the offsets should be rounded at all
 * @returns {Object} The popper's position offsets rounded
 *
 * The tale of pixel-perfect positioning. It's still not 100% perfect, but as
 * good as it can be within reason.
 * Discussion here: https://github.com/FezVrasta/popper.js/pull/715
 *
 * Low DPI screens cause a popper to be blurry if not using full pixels (Safari
 * as well on High DPI screens).
 *
 * Firefox prefers no rounding for positioning and does not have blurriness on
 * high DPI screens.
 *
 * Only horizontal placement and left/right values need to be considered.
 */
function getRoundedOffsets(data, shouldRound) {
    const {popper, reference} = data.offsets;
    const {round, floor} = Math;
    const noRound = v => v;

    const referenceWidth = round(reference.width);
    const popperWidth = round(popper.width);

    const isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
    const isVariation = data.placement.indexOf('-') !== -1;
    const sameWidthParity = referenceWidth % 2 === popperWidth % 2;
    const bothOddWidth = referenceWidth % 2 === 1 && popperWidth % 2 === 1;

    const horizontalToInteger = !shouldRound ? noRound : isVertical || isVariation || sameWidthParity ? round : floor;
    const verticalToInteger = !shouldRound ? noRound : round;

    return {
        left: horizontalToInteger(bothOddWidth && !isVariation && shouldRound ? popper.left - 1 : popper.left),
        top: verticalToInteger(popper.top),
        bottom: verticalToInteger(popper.bottom),
        right: horizontalToInteger(popper.right)
    };
}

const isFirefox = isBrowser && /Firefox/i.test(navigator.userAgent);

/**
 * @function
 * @memberof Modifiers
 * @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 computeStyle(data, options) {
    const {x, y} = options;
    const {popper} = data.offsets;

    // Remove this legacy support in Popper.js v2
    const legacyGpuAccelerationOption = find(data.instance.modifiers, modifier => modifier.name === 'applyStyle').gpuAcceleration;
    if (legacyGpuAccelerationOption !== undefined) {
        console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
    }
    const gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;

    const offsetParent = getOffsetParent(data.instance.popper);
    const offsetParentRect = getBoundingClientRect(offsetParent);

    // Styles
    const styles = {
        position: popper.position
    };

    const offsets = getRoundedOffsets(data, window.devicePixelRatio < 2 || !isFirefox);

    const sideA = x === 'bottom' ? 'top' : 'bottom';
    const sideB = y === 'right' ? 'left' : 'right';

    // if gpuAcceleration is set to `true` and transform is supported,
    //  we use `translate3d` to apply the position to the popper we
    // automatically use the supported prefixed version if needed
    const prefixedProperty = getSupportedPropertyName('transform');

    // now, let's make a step back and look at this code closely (wtf?)
    // If the content of the popper grows once it's been positioned, it
    // may happen that the popper gets misplaced because of the new content
    // overflowing its reference element
    // To avoid this problem, we provide two options (x and y), which allow
    // the consumer to define the offset origin.
    // If we position a popper on top of a reference element, we can set
    // `x` to `top` to make the popper grow towards its top instead of
    // its bottom.
    let left, top;
    if (sideA === 'bottom') {
        // when offsetParent is <html> the positioning is relative to the bottom of the screen (excluding the scrollbar)
        // and not the bottom of the html element
        if (offsetParent.nodeName === 'HTML') {
            top = -offsetParent.clientHeight + offsets.bottom;
        } else {
            top = -offsetParentRect.height + offsets.bottom;
        }
    } else {
        top = offsets.top;
    }
    if (sideB === 'right') {
        if (offsetParent.nodeName === 'HTML') {
            left = -offsetParent.clientWidth + offsets.right;
        } else {
            left = -offsetParentRect.width + offsets.right;
        }
    } else {
        left = offsets.left;
    }
    if (gpuAcceleration && prefixedProperty) {
        styles[prefixedProperty] = `translate3d(${left}px, ${top}px, 0)`;
        styles[sideA] = 0;
        styles[sideB] = 0;
        styles.willChange = 'transform';
    } else {
        // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
        const invertTop = sideA === 'bottom' ? -1 : 1;
        const invertLeft = sideB === 'right' ? -1 : 1;
        styles[sideA] = top * invertTop;
        styles[sideB] = left * invertLeft;
        styles.willChange = `${sideA}, ${sideB}`;
    }

    // Attributes
    const attributes = {
        'x-placement': data.placement
    };

    // Update `data` attributes, styles and arrowStyles
    data.attributes = _extends({}, attributes, data.attributes);
    data.styles = _extends({}, styles, data.styles);
    data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);

    return data;
}

/**
 * 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;
}

/**
 * @function
 * @memberof Modifiers
 * @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 arrow(data, options) {
    // arrow depends on keepTogether in order to work
    if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
        return data;
    }

    let arrowElement = options.element;

    // if arrowElement is a string, suppose it's a CSS selector
    if (typeof arrowElement === 'string') {
        arrowElement = data.instance.popper.querySelector(arrowElement);

        // if arrowElement is not found, don't run the modifier
        if (!arrowElement) {
            return data;
        }
    } else {
        // if the arrowElement isn't a query selector we must check that the
        // provided DOM node is child of its popper node
        if (!data.instance.popper.contains(arrowElement)) {
            console.warn('WARNING: `arrow.element` must be child of its popper element!');
            return data;
        }
    }

    const placement = data.placement.split('-')[0];
    const {popper, reference} = data.offsets;
    const isVertical = ['left', 'right'].indexOf(placement) !== -1;

    const len = isVertical ? 'height' : 'width';
    const sideCapitalized = isVertical ? 'Top' : 'Left';
    const side = sideCapitalized.toLowerCase();
    const altSide = isVertical ? 'left' : 'top';
    const opSide = isVertical ? 'bottom' : 'right';
    const arrowElementSize = getOuterSizes(arrowElement)[len];

    //
    // extends keepTogether behavior making sure the popper and its
    // reference have enough pixels in conjunction
    //

    // top/left side
    if (reference[opSide] - arrowElementSize < popper[side]) {
        data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
    }
    // bottom/right side
    if (reference[side] + arrowElementSize > popper[opSide]) {
        data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
    }
    data.offsets.popper = getClientRect(data.offsets.popper);

    // compute center of the popper
    const center = reference[side] + reference[len] / 2 - arrowElementSize / 2;

    // Compute the sideValue using the updated popper offsets
    // take popper margin in account because we don't have this info available
    const css = getStyleComputedProperty(data.instance.popper);
    const popperMarginSide = parseFloat(css[`margin${sideCapitalized}`]);
    const popperBorderSide = parseFloat(css[`border${sideCapitalized}Width`]);
    let sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;

    // prevent arrowElement from being placed not contiguously to its popper
    sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);

    data.arrowElement = arrowElement;
    data.offsets.arrow = {
        [side]: Math.round(sideValue),
        [altSide]: '' // make sure to unset any eventual altSide value from the DOM node
    };

    return data;
}

/**
 * Get the opposite placement variation of the given one
 * @method
 * @memberof Popper.Utils
 * @argument {String} placement variation
 * @returns {String} flipped placement variation
 */
function getOppositeVariation(variation) {
    if (variation === 'end') {
        return 'start';
    } else if (variation === 'start') {
        return 'end';
    }
    return variation;
}

/**
 * List of accepted placements to use as values of the `placement` option.<br />
 * Valid placements are:
 * - `auto`
 * - `top`
 * - `right`
 * - `bottom`
 * - `left`
 *
 * Each placement can have a variation from this list:
 * - `-start`
 * - `-end`
 *
 * Variations are interpreted easily if you think of them as the left to right
 * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
 * is right.<br />
 * Vertically (`left` and `right`), `start` is top and `end` is bottom.
 *
 * Some valid examples are:
 * - `top-end` (on top of reference, right aligned)
 * - `right-start` (on right of reference, top aligned)
 * - `bottom` (on bottom, centered)
 * - `auto-end` (on the side with more space available, alignment depends by placement)
 *
 * @static
 * @type {Array}
 * @enum {String}
 * @readonly
 * @method placements
 * @memberof Popper
 */
var placements = ['auto-start', 'auto', 'auto-end', 'top-start', 'top', 'top-end', 'right-start', 'right', 'right-end', 'bottom-end', 'bottom', 'bottom-start', 'left-end', 'left', 'left-start'];

// Get rid of `auto` `auto-start` and `auto-end`
const validPlacements = placements.slice(3);

/**
 * Given an initial placement, returns all the subsequent placements
 * clockwise (or counter-clockwise).
 *
 * @method
 * @memberof Popper.Utils
 * @argument {String} placement - A valid placement (it accepts variations)
 * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
 * @returns {Array} placements including their variations
 */
function clockwise(placement, counter = false) {
    const index = validPlacements.indexOf(placement);
    const arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
    return counter ? arr.reverse() : arr;
}

const BEHAVIORS = {
    FLIP: 'flip',
    CLOCKWISE: 'clockwise',
    COUNTERCLOCKWISE: 'counterclockwise'
};

/**
 * @function
 * @memberof Modifiers
 * @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 flip(data, options) {
    // if `inner` modifier is enabled, we can't use the `flip` modifier
    if (isModifierEnabled(data.instance.modifiers, 'inner')) {
        return data;
    }

    if (data.flipped && data.placement === data.originalPlacement) {
        // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
        return data;
    }

    const boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement, data.positionFixed);

    let placement = data.placement.split('-')[0];
    let placementOpposite = getOppositePlacement(placement);
    let variation = data.placement.split('-')[1] || '';

    let flipOrder = [];

    switch (options.behavior) {
        case BEHAVIORS.FLIP:
            flipOrder = [placement, placementOpposite];
            break;
        case BEHAVIORS.CLOCKWISE:
            flipOrder = clockwise(placement);
            break;
        case BEHAVIORS.COUNTERCLOCKWISE:
            flipOrder = clockwise(placement, true);
            break;
        default:
            flipOrder = options.behavior;
    }

    flipOrder.forEach((step, index) => {
        if (placement !== step || flipOrder.length === index + 1) {
            return data;
        }

        placement = data.placement.split('-')[0];
        placementOpposite = getOppositePlacement(placement);

        const popperOffsets = data.offsets.popper;
        const refOffsets = data.offsets.reference;

        // using floor because the reference offsets may contain decimals we are not going to consider here
        const floor = Math.floor;
        const overlapsRef = placement === 'left' && floor(popperOffsets.right) > floor(refOffsets.left) || placement === 'right' && floor(popperOffsets.left) < floor(refOffsets.right) || placement === 'top' && floor(popperOffsets.bottom) > floor(refOffsets.top) || placement === 'bottom' && floor(popperOffsets.top) < floor(refOffsets.bottom);

        const overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
        const overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
        const overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
        const overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);

        const overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;

        // flip the variation if required
        const isVertical = ['top', 'bottom'].indexOf(placement) !== -1;

        // flips variation if reference element overflows boundaries
        const flippedVariationByRef = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);

        // flips variation if popper content overflows boundaries
        const flippedVariationByContent = !!options.flipVariationsByContent && (isVertical && variation === 'start' && overflowsRight || isVertical && variation === 'end' && overflowsLeft || !isVertical && variation === 'start' && overflowsBottom || !isVertical && variation === 'end' && overflowsTop);

        const flippedVariation = flippedVariationByRef || flippedVariationByContent;

        if (overlapsRef || overflowsBoundaries || flippedVariation) {
            // this boolean to detect any flip loop
            data.flipped = true;

            if (overlapsRef || overflowsBoundaries) {
                placement = flipOrder[index + 1];
            }

            if (flippedVariation) {
                variation = getOppositeVariation(variation);
            }

            data.placement = placement + (variation ? '-' + variation : '');

            // this object contains `position`, we want to preserve it along with
            // any additional property we may add in the future
            data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));

            data = runModifiers(data.instance.modifiers, data, 'flip');
        }
    });
    return data;
}

/**
 * @function
 * @memberof Modifiers
 * @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 keepTogether(data) {
    const {popper, reference} = data.offsets;
    const placement = data.placement.split('-')[0];
    const floor = Math.floor;
    const isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
    const side = isVertical ? 'right' : 'bottom';
    const opSide = isVertical ? 'left' : 'top';
    const measurement = isVertical ? 'width' : 'height';

    if (popper[side] < floor(reference[opSide])) {
        data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
    }
    if (popper[opSide] > floor(reference[side])) {
        data.offsets.popper[opSide] = floor(reference[side]);
    }

    return data;
}

/**
 * Converts a string containing value + unit into a px value number
 * @function
 * @memberof {modifiers~offset}
 * @private
 * @argument {String} str - Value + unit string
 * @argument {String} measurement - `height` or `width`
 * @argument {Object} popperOffsets
 * @argument {Object} referenceOffsets
 * @returns {Number|String}
 * Value in pixels, or original string if no values were extracted
 */
function toValue(str, measurement, popperOffsets, referenceOffsets) {
    // separate value from unit
    const split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
    const value = +split[1];
    const unit = split[2];

    // If it's not a number it's an operator, I guess
    if (!value) {
        return str;
    }

    if (unit.indexOf('%') === 0) {
        let element;
        switch (unit) {
            case '%p':
                element = popperOffsets;
                break;
            case '%':
            case '%r':
            default:
                element = referenceOffsets;
        }

        const rect = getClientRect(element);
        return rect[measurement] / 100 * value;
    } else if (unit === 'vh' || unit === 'vw') {
        // if is a vh or vw, we calculate the size based on the viewport
        let size;
        if (unit === 'vh') {
            size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
        } else {
            size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
        }
        return size / 100 * value;
    } else {
        // if is an explicit pixel unit, we get rid of the unit and keep the value
        // if is an implicit unit, it's px, and we return just the value
        return value;
    }
}

/**
 * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
 * @function
 * @memberof {modifiers~offset}
 * @private
 * @argument {String} offset
 * @argument {Object} popperOffsets
 * @argument {Object} referenceOffsets
 * @argument {String} basePlacement
 * @returns {Array} a two cells array with x and y offsets in numbers
 */
function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
    const offsets = [0, 0];

    // Use height if placement is left or right and index is 0 otherwise use width
    // in this way the first offset will use an axis and the second one
    // will use the other one
    const useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;

    // Split the offset string to obtain a list of values and operands
    // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
    const fragments = offset.split(/(\+|\-)/).map(frag => frag.trim());

    // Detect if the offset string contains a pair of values or a single one
    // they could be separated by comma or space
    const divider = fragments.indexOf(find(fragments, frag => frag.search(/,|\s/) !== -1));

    if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
        console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
    }

    // If divider is found, we divide the list of values and operands to divide
    // them by ofset X and Y.
    const splitRegex = /\s*,\s*|\s+/;
    let ops = divider !== -1 ? [fragments.slice(0, divider).concat([fragments[divider].split(splitRegex)[0]]), [fragments[divider].split(splitRegex)[1]].concat(fragments.slice(divider + 1))] : [fragments];

    // Convert the values with units to absolute pixels to allow our computations
    ops = ops.map((op, index) => {
        // Most of the units rely on the orientation of the popper
        const measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
        let mergeWithPrevious = false;
        return op
            // This aggregates any `+` or `-` sign that aren't considered operators
            // e.g.: 10 + +5 => [10, +, +5]
            .reduce((a, b) => {
                if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
                    a[a.length - 1] = b;
                    mergeWithPrevious = true;
                    return a;
                } else if (mergeWithPrevious) {
                    a[a.length - 1] += b;
                    mergeWithPrevious = false;
                    return a;
                } else {
                    return a.concat(b);
                }
            }, [])
            // Here we convert the string values into number values (in px)
            .map(str => toValue(str, measurement, popperOffsets, referenceOffsets));
    });

    // Loop trough the offsets arrays and execute the operations
    ops.forEach((op, index) => {
        op.forEach((frag, index2) => {
            if (isNumeric(frag)) {
                offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
            }
        });
    });
    return offsets;
}

/**
 * @function
 * @memberof Modifiers
 * @argument {Object} data - The data object generated by update method
 * @argument {Object} options - Modifiers configuration and options
 * @argument {Number|String} options.offset=0
 * The offset value as described in the modifier description
 * @returns {Object} The data object, properly modified
 */
function offset(data, {offset}) {
    const {placement, offsets: {popper, reference}} = data;
    const basePlacement = placement.split('-')[0];

    let offsets;
    if (isNumeric(+offset)) {
        offsets = [+offset, 0];
    } else {
        offsets = parseOffset(offset, popper, reference, basePlacement);
    }

    if (basePlacement === 'left') {
        popper.top += offsets[0];
        popper.left -= offsets[1];
    } else if (basePlacement === 'right') {
        popper.top += offsets[0];
        popper.left += offsets[1];
    } else if (basePlacement === 'top') {
        popper.left += offsets[0];
        popper.top -= offsets[1];
    } else if (basePlacement === 'bottom') {
        popper.left += offsets[0];
        popper.top += offsets[1];
    }

    data.popper = popper;
    return data;
}

/**
 * @function
 * @memberof Modifiers
 * @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 preventOverflow(data, options) {
    let boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);

    // If offsetParent is the reference element, we really want to
    // go one step up and use the next offsetParent as reference to
    // avoid to make this modifier completely useless and look like broken
    if (data.instance.reference === boundariesElement) {
        boundariesElement = getOffsetParent(boundariesElement);
    }

    // NOTE: DOM access here
    // resets the popper's position so that the document size can be calculated excluding
    // the size of the popper element itself
    const transformProp = getSupportedPropertyName('transform');
    const popperStyles = data.instance.popper.style; // assignment to help minification
    const {top, left, [transformProp]: transform} = popperStyles;
    popperStyles.top = '';
    popperStyles.left = '';
    popperStyles[transformProp] = '';

    const boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement, data.positionFixed);

    // NOTE: DOM access here
    // restores the original style properties after the offsets have been computed
    popperStyles.top = top;
    popperStyles.left = left;
    popperStyles[transformProp] = transform;

    options.boundaries = boundaries;

    const order = options.priority;
    let popper = data.offsets.popper;

    const check = {
        primary(placement) {
            let value = popper[placement];
            if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
                value = Math.max(popper[placement], boundaries[placement]);
            }
            return {[placement]: value};
        },
        secondary(placement) {
            const mainSide = placement === 'right' ? 'left' : 'top';
            let value = popper[mainSide];
            if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
                value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
            }
            return {[mainSide]: value};
        }
    };

    order.forEach(placement => {
        const side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
        popper = _extends({}, popper, check[side](placement));
    });

    data.offsets.popper = popper;

    return data;
}

/**
 * @function
 * @memberof Modifiers
 * @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 shift(data) {
    const placement = data.placement;
    const basePlacement = placement.split('-')[0];
    const shiftvariation = placement.split('-')[1];

    // if shift shiftvariation is specified, run the modifier
    if (shiftvariation) {
        const {reference, popper} = data.offsets;
        const isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
        const side = isVertical ? 'left' : 'top';
        const measurement = isVertical ? 'width' : 'height';

        const shiftOffsets = {
            start: {[side]: reference[side]},
            end: {
                [side]: reference[side] + reference[measurement] - popper[measurement]
            }
        };

        data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
    }

    return data;
}

/**
 * @function
 * @memberof Modifiers
 * @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 hide(data) {
    if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
        return data;
    }

    const refRect = data.offsets.reference;
    const bound = find(data.instance.modifiers, modifier => modifier.name === 'preventOverflow').boundaries;

    if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
        // Avoid unnecessary DOM access if visibility hasn't changed
        if (data.hide === true) {
            return data;
        }

        data.hide = true;
        data.attributes['x-out-of-boundaries'] = '';
    } else {
        // Avoid unnecessary DOM access if visibility hasn't changed
        if (data.hide === false) {
            return data;
        }

        data.hide = false;
        data.attributes['x-out-of-boundaries'] = false;
    }

    return data;
}

/**
 * @function
 * @memberof Modifiers
 * @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 inner(data) {
    const placement = data.placement;
    const basePlacement = placement.split('-')[0];
    const {popper, reference} = data.offsets;
    const isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;

    const subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;

    popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);

    data.placement = getOppositePlacement(placement);
    data.offsets.popper = getClientRect(popper);

    return data;
}

/**
 * Modifier function, each modifier can have a function of this type assigned
 * to its `fn` property.<br />
 * These functions will be called on each update, this means that you must
 * make sure they are performant enough to avoid performance bottlenecks.
 *
 * @function ModifierFn
 * @argument {dataObject} data - The data object generated by `update` method
 * @argument {Object} options - Modifiers configuration and options
 * @returns {dataObject} The data object, properly modified
 */

/**
 * Modifiers are plugins used to alter the behavior of your poppers.<br />
 * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
 * needed by the library.
 *
 * Usually you don't want to override the `order`, `fn` and `onLoad` props.
 * All the other properties are configurations that could be tweaked.
 * @namespace modifiers
 */
var modifiers = {
    /**
     * Modifier used to shift the popper on the start or end of its reference
     * element.<br />
     * It will read the variation of the `placement` property.<br />
     * It can be one either `-end` or `-start`.
     * @memberof modifiers
     * @inner
     */
    shift: {
        /** @prop {number} order=100 - Index used to define the order of execution */
        order: 100,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: shift
    },

    /**
     * The `offset` modifier can shift your popper on both its axis.
     *
     * It accepts the following units:
     * - `px` or unit-less, interpreted as pixels
     * - `%` or `%r`, percentage relative to the length of the reference element
     * - `%p`, percentage relative to the length of the popper element
     * - `vw`, CSS viewport width unit
     * - `vh`, CSS viewport height unit
     *
     * For length is intended the main axis relative to the placement of the popper.<br />
     * This means that if the placement is `top` or `bottom`, the length will be the
     * `width`. In case of `left` or `right`, it will be the `height`.
     *
     * You can provide a single value (as `Number` or `String`), or a pair of values
     * as `String` divided by a comma or one (or more) white spaces.<br />
     * The latter is a deprecated method because it leads to confusion and will be
     * removed in v2.<br />
     * Additionally, it accepts additions and subtractions between different units.
     * Note that multiplications and divisions aren't supported.
     *
     * Valid examples are:
     * ```
     * 10
     * '10%'
     * '10, 10'
     * '10%, 10'
     * '10 + 10%'
     * '10 - 5vh + 3%'
     * '-10px + 5vh, 5px - 6%'
     * ```
     * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap
     * > with their reference element, unfortunately, you will have to disable the `flip` modifier.
     * > You can read more on this at this [issue](https://github.com/FezVrasta/popper.js/issues/373).
     *
     * @memberof modifiers
     * @inner
     */
    offset: {
        /** @prop {number} order=200 - Index used to define the order of execution */
        order: 200,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: offset,
        /** @prop {Number|String} offset=0
         * The offset value as described in the modifier description
         */
        offset: 0
    },

    /**
     * Modifier used to prevent the popper from being positioned outside the boundary.
     *
     * A scenario exists where the reference itself is not within the boundaries.<br />
     * We can say it has "escaped the boundaries" — or just "escaped".<br />
     * In this case we need to decide whether the popper should either:
     *
     * - detach from the reference and remain "trapped" in the boundaries, or
     * - if it should ignore the boundary and "escape with its reference"
     *
     * When `escapeWithReference` is set to`true` and reference is completely
     * outside its boundaries, the popper will overflow (or completely leave)
     * the boundaries in order to remain attached to the edge of the reference.
     *
     * @memberof modifiers
     * @inner
     */
    preventOverflow: {
        /** @prop {number} order=300 - Index used to define the order of execution */
        order: 300,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: preventOverflow,
        /**
         * @prop {Array} [priority=['left','right','top','bottom']]
         * Popper will try to prevent overflow following these priorities by default,
         * then, it could overflow on the left and on top of the `boundariesElement`
         */
        priority: ['left', 'right', 'top', 'bottom'],
        /**
         * @prop {number} padding=5
         * Amount of pixel used to define a minimum distance between the boundaries
         * and the popper. This makes sure the popper always has a little padding
         * between the edges of its container
         */
        padding: 5,
        /**
         * @prop {String|HTMLElement} boundariesElement='scrollParent'
         * Boundaries used by the modifier. Can be `scrollParent`, `window`,
         * `viewport` or any DOM element.
         */
        boundariesElement: 'scrollParent'
    },

    /**
     * Modifier used to make sure the reference and its popper stay near each other
     * without leaving any gap between the two. Especially useful when the arrow is
     * enabled and you want to ensure that it points to its reference element.
     * It cares only about the first axis. You can still have poppers with margin
     * between the popper and its reference element.
     * @memberof modifiers
     * @inner
     */
    keepTogether: {
        /** @prop {number} order=400 - Index used to define the order of execution */
        order: 400,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: keepTogether
    },

    /**
     * This modifier is used to move the `arrowElement` of the popper to make
     * sure it is positioned between the reference element and its popper element.
     * It will read the outer size of the `arrowElement` node to detect how many
     * pixels of conjunction are needed.
     *
     * It has no effect if no `arrowElement` is provided.
     * @memberof modifiers
     * @inner
     */
    arrow: {
        /** @prop {number} order=500 - Index used to define the order of execution */
        order: 500,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: arrow,
        /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */
        element: '[x-arrow]'
    },

    /**
     * Modifier used to flip the popper's placement when it starts to overlap its
     * reference element.
     *
     * Requires the `preventOverflow` modifier before it in order to work.
     *
     * **NOTE:** this modifier will interrupt the current update cycle and will
     * restart it if it detects the need to flip the placement.
     * @memberof modifiers
     * @inner
     */
    flip: {
        /** @prop {number} order=600 - Index used to define the order of execution */
        order: 600,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: flip,
        /**
         * @prop {String|Array} behavior='flip'
         * The behavior used to change the popper's placement. It can be one of
         * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid
         * placements (with optional variations)
         */
        behavior: 'flip',
        /**
         * @prop {number} padding=5
         * The popper will flip if it hits the edges of the `boundariesElement`
         */
        padding: 5,
        /**
         * @prop {String|HTMLElement} boundariesElement='viewport'
         * The element which will define the boundaries of the popper position.
         * The popper will never be placed outside of the defined boundaries
         * (except if `keepTogether` is enabled)
         */
        boundariesElement: 'viewport',
        /**
         * @prop {Boolean} flipVariations=false
         * The popper will switch placement variation between `-start` and `-end` when
         * the reference element overlaps its boundaries.
         *
         * The original placement should have a set variation.
         */
        flipVariations: false,
        /**
         * @prop {Boolean} flipVariationsByContent=false
         * The popper will switch placement variation between `-start` and `-end` when
         * the popper element overlaps its reference boundaries.
         *
         * The original placement should have a set variation.
         */
        flipVariationsByContent: false
    },

    /**
     * Modifier used to make the popper flow toward the inner of the reference element.
     * By default, when this modifier is disabled, the popper will be placed outside
     * the reference element.
     * @memberof modifiers
     * @inner
     */
    inner: {
        /** @prop {number} order=700 - Index used to define the order of execution */
        order: 700,
        /** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */
        enabled: false,
        /** @prop {ModifierFn} */
        fn: inner
    },

    /**
     * Modifier used to hide the popper when its reference element is outside of the
     * popper boundaries. It will set a `x-out-of-boundaries` attribute which can
     * be used to hide with a CSS selector the popper when its reference is
     * out of boundaries.
     *
     * Requires the `preventOverflow` modifier before it in order to work.
     * @memberof modifiers
     * @inner
     */
    hide: {
        /** @prop {number} order=800 - Index used to define the order of execution */
        order: 800,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: hide
    },

    /**
     * Computes the style that will be applied to the popper element to gets
     * properly positioned.
     *
     * Note that this modifier will not touch the DOM, it just prepares the styles
     * so that `applyStyle` modifier can apply it. This separation is useful
     * in case you need to replace `applyStyle` with a custom implementation.
     *
     * This modifier has `850` as `order` value to maintain backward compatibility
     * with previous versions of Popper.js. Expect the modifiers ordering method
     * to change in future major versions of the library.
     *
     * @memberof modifiers
     * @inner
     */
    computeStyle: {
        /** @prop {number} order=850 - Index used to define the order of execution */
        order: 850,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: computeStyle,
        /**
         * @prop {Boolean} gpuAcceleration=true
         * If true, it uses the CSS 3D transformation to position the popper.
         * Otherwise, it will use the `top` and `left` properties
         */
        gpuAcceleration: true,
        /**
         * @prop {string} [x='bottom']
         * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.
         * Change this if your popper should grow in a direction different from `bottom`
         */
        x: 'bottom',
        /**
         * @prop {string} [x='left']
         * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.
         * Change this if your popper should grow in a direction different from `right`
         */
        y: 'right'
    },

    /**
     * Applies the computed styles to the popper element.
     *
     * All the DOM manipulations are limited to this modifier. This is useful in case
     * you want to integrate Popper.js inside a framework or view library and you
     * want to delegate all the DOM manipulations to it.
     *
     * Note that if you disable this modifier, you must make sure the popper element
     * has its position set to `absolute` before Popper.js can do its work!
     *
     * Just disable this modifier and define your own to achieve the desired effect.
     *
     * @memberof modifiers
     * @inner
     */
    applyStyle: {
        /** @prop {number} order=900 - Index used to define the order of execution */
        order: 900,
        /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
        enabled: true,
        /** @prop {ModifierFn} */
        fn: applyStyle,
        /** @prop {Function} */
        onLoad: applyStyleOnLoad,
        /**
         * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
         * @prop {Boolean} gpuAcceleration=true
         * If true, it uses the CSS 3D transformation to position the popper.
         * Otherwise, it will use the `top` and `left` properties
         */
        gpuAcceleration: undefined
    }
};

/**
 * The `dataObject` is an object containing all the information used by Popper.js.
 * This object is passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
 * @name dataObject
 * @property {Object} data.instance The Popper.js instance
 * @property {String} data.placement Placement applied to popper
 * @property {String} data.originalPlacement Placement originally defined on init
 * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
 * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper
 * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
 * @property {Object} data.styles Any CSS property defined here will be applied to the popper. It expects the JavaScript nomenclature (eg. `marginBottom`)
 * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow. It expects the JavaScript nomenclature (eg. `marginBottom`)
 * @property {Object} data.boundaries Offsets of the popper boundaries
 * @property {Object} data.offsets The measurements of popper, reference and arrow elements
 * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
 * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
 * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
 */

/**
 * Default options provided to Popper.js constructor.<br />
 * These can be overridden using the `options` argument of Popper.js.<br />
 * To override an option, simply pass an object with the same
 * structure of the `options` object, as the 3rd argument. For example:
 * ```
 * new Popper(ref, pop, {
 *   modifiers: {
 *     preventOverflow: { enabled: false }
 *   }
 * })
 * ```
 * @type {Object}
 * @static
 * @memberof Popper
 */
var Defaults = {
    /**
     * Popper's placement.
     * @prop {Popper.placements} placement='bottom'
     */
    placement: 'bottom',

    /**
     * Set this to true if you want popper to position it self in 'fixed' mode
     * @prop {Boolean} positionFixed=false
     */
    positionFixed: false,

    /**
     * Whether events (resize, scroll) are initially enabled.
     * @prop {Boolean} eventsEnabled=true
     */
    eventsEnabled: true,

    /**
     * Set to true if you want to automatically remove the popper when
     * you call the `destroy` method.
     * @prop {Boolean} removeOnDestroy=false
     */
    removeOnDestroy: false,

    /**
     * Callback called when the popper is created.<br />
     * By default, it is set to no-op.<br />
     * Access Popper.js instance with `data.instance`.
     * @prop {onCreate}
     */
    onCreate: () => {
    },

    /**
     * Callback called when the popper is updated. This callback is not called
     * on the initialization/creation of the popper, but only on subsequent
     * updates.<br />
     * By default, it is set to no-op.<br />
     * Access Popper.js instance with `data.instance`.
     * @prop {onUpdate}
     */
    onUpdate: () => {
    },

    /**
     * List of modifiers used to modify the offsets before they are applied to the popper.
     * They provide most of the functionalities of Popper.js.
     * @prop {modifiers}
     */
    modifiers
};

/**
 * @callback onCreate
 * @param {dataObject} data
 */

/**
 * @callback onUpdate
 * @param {dataObject} data
 */

// Utils
// Methods
class Popper {
    /**
     * Creates a new Popper.js instance.
     * @class Popper
     * @param {Element|referenceObject} reference - The reference element used to position the popper
     * @param {Element} popper - The HTML / XML element used as the popper
     * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
     * @return {Object} instance - The generated Popper.js instance
     */
    constructor(reference, popper, options = {}) {
        this.scheduleUpdate = () => requestAnimationFrame(this.update);

        // make update() debounced, so that it only runs at most once-per-tick
        this.update = debounce(this.update.bind(this));

        // with {} we create a new object with the options inside it
        this.options = _extends({}, Popper.Defaults, options);

        // init state
        this.state = {
            isDestroyed: false,
            isCreated: false,
            scrollParents: []
        };

        // get reference and popper elements (allow jQuery wrappers)
        this.reference = reference && reference.jquery ? reference[0] : reference;
        this.popper = popper && popper.jquery ? popper[0] : popper;

        // Deep merge modifiers options
        this.options.modifiers = {};
        Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(name => {
            this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
        });

        // Refactoring modifiers' list (Object => Array)
        this.modifiers = Object.keys(this.options.modifiers).map(name => _extends({
            name
        }, this.options.modifiers[name]))
            // sort the modifiers by order
            .sort((a, b) => a.order - b.order);

        // modifiers have the ability to execute arbitrary code when Popper.js get inited
        // such code is executed in the same order of its modifier
        // they could add new properties to their options configuration
        // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
        this.modifiers.forEach(modifierOptions => {
            if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
                modifierOptions.onLoad(this.reference, this.popper, this.options, modifierOptions, this.state);
            }
        });

        // fire the first update to position the popper in the right place
        this.update();

        const eventsEnabled = this.options.eventsEnabled;
        if (eventsEnabled) {
            // setup event listeners, they will take care of update the position in specific situations
            this.enableEventListeners();
        }

        this.state.eventsEnabled = eventsEnabled;
    }

    // We can't use class properties because they don't get listed in the
    // class prototype and break stuff like Sinon stubs
    update() {
        return update.call(this);
    }

    destroy() {
        return destroy.call(this);
    }

    enableEventListeners() {
        return enableEventListeners.call(this);
    }

    disableEventListeners() {
        return disableEventListeners.call(this);
    }

    /**
     * Schedules an update. It will run on the next UI update available.
     * @method scheduleUpdate
     * @memberof Popper
     */


    /**
     * Collection of utilities useful when writing custom modifiers.
     * Starting from version 1.7, this method is available only if you
     * include `popper-utils.js` before `popper.js`.
     *
     * **DEPRECATION**: This way to access PopperUtils is deprecated
     * and will be removed in v2! Use the PopperUtils module directly instead.
     * Due to the high instability of the methods contained in Utils, we can't
     * guarantee them to follow semver. Use them at your own risk!
     * @static
     * @private
     * @type {Object}
     * @deprecated since version 1.8
     * @member Utils
     * @memberof Popper
     */
}

/**
 * The `referenceObject` is an object that provides an interface compatible with Popper.js
 * and lets you use it as replacement of a real DOM node.<br />
 * You can use this method to position a popper relatively to a set of coordinates
 * in case you don't have a DOM node to use as reference.
 *
 * ```
 * new Popper(referenceObject, popperNode);
 * ```
 *
 * NB: This feature isn't supported in Internet Explorer 10.
 * @name referenceObject
 * @property {Function} data.getBoundingClientRect
 * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
 * @property {number} data.clientWidth
 * An ES6 getter that will return the width of the virtual reference element.
 * @property {number} data.clientHeight
 * An ES6 getter that will return the height of the virtual reference element.
 */

Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
Popper.placements = placements;
Popper.Defaults = Defaults;

export default Popper;
//# sourceMappingURL=popper.js.map