\n \n
`);\n\n $form.appendTo($shareDiv);\n\n $form.find('.fieldset-embed input').on('change', event => {\n const form = $(event.target).parents('form:first');\n const params = {};\n params.mode = $(form.find('.fieldset-embed input[name=pages]:checked')).val();\n if (form.find('.fieldset-embed input[name=thispage]').prop('checked')) {\n params.page = br.getPageNum(br.currentIndex());\n }\n\n if (br.getEmbedCode) {\n // $$$ changeable width/height to be added to share UI\n const frameWidth = \"480px\";\n const frameHeight = \"430px\";\n form.find('.BRframeEmbed').val(br.getEmbedCode(frameWidth, frameHeight, params));\n }\n });\n\n $form.find('input, textarea').on('focus', event => event.target.select());\n\n // Bind share buttons\n\n // Use url without hashes\n $form.find('.facebook-share-button').click(() => {\n const params = $.param({ u: this._getSocialShareUrl() });\n const url = 'https://www.facebook.com/sharer.php?' + params;\n createPopup(url, 600, 400, 'Share');\n });\n $form.find('.twitter-share-button').click(() => {\n const params = $.param({\n url: this._getSocialShareUrl(),\n text: br.bookTitle\n });\n const url = 'https://twitter.com/intent/tweet?' + params;\n createPopup(url, 600, 400, 'Share');\n });\n $form.find('.email-share-button').click(() => {\n const body = `${br.bookTitle}\\n\\n${this._getSocialShareUrl()}`;\n window.location.href = `mailto:?subject=${encodeURI(br.bookTitle)}&body=${encodeURI(body)}`;\n });\n\n $form.find('input[name=thispage]').trigger('change');\n\n $form.appendTo($shareDiv);\n }\n\n _getSocialShareUrl() {\n const { br } = this;\n const shareThisPage = br.$('.thispage-social').prop('checked');\n if (shareThisPage) {\n return window.location.href;\n } else {\n return `${document.location.protocol}//${window.location.hostname}${window.location.pathname}`;\n }\n }\n\n /**\n * @param {JQuery} $infoDiv DOM element. Appends info to this element\n * Can be overridden or extended\n */\n buildInfoDiv($infoDiv) {\n const { br } = this;\n // Remove these legacy elements\n $infoDiv.find('.BRfloatBody, .BRfloatCover, .BRfloatFoot').remove();\n\n const $leftCol = $(``);\n if (br.thumbnail) {\n $leftCol.append($(`\n \n ![\"${escapeHTML(br.bookTitle)}\"](\"${br.thumbnail}\")
\n
`));\n }\n\n const $rightCol = $(``);\n\n // A loop to build fields\n for (const {extraValueClass = '', label, value} of br.metadata) {\n const escapedValue = label === 'Title' ? escapeHTML(value) : value;\n $rightCol.append($(`\n
\n
`));\n }\n\n const moreInfoText = br.bookUrlMoreInfo ? br.bookUrlMoreInfo : br.bookTitle;\n if (moreInfoText && br.bookUrl) {\n $rightCol.append($(`\n ${label}
\n ${escapedValue}
\n \n \n
`));\n }\n\n const $footer = $(``);\n const $children = $('').append([\n $leftCol,\n $rightCol,\n $('
'),\n ]);\n\n $infoDiv\n .append($children, $footer)\n .addClass('wide');\n }\n\n /**\n * @return {number} (in pixels) of the toolbar height. 0 if no toolbar.\n */\n getToolBarHeight() {\n const { $BRtoolbar } = this.br.refs;\n if ($BRtoolbar && $BRtoolbar.css('display') === 'block') {\n return ($BRtoolbar.outerHeight() + parseInt($BRtoolbar.css('top')));\n } else {\n return 0;\n }\n }\n}\n\nexport function blankInfoDiv() {\n return $(`\n `);\n}\n\nexport function blankShareDiv() {\n return $(`\n} e\n */\n const handler = function(element, e) {\n if (e.which == 3) {\n // right click\n return !e.data.self.br.protected;\n }\n e.data.self.br.trigger(EVENTS.stop);\n e.data.self.br[e.data.direction === 'L' ? 'left' : 'right']();\n\n // Removed event handler for mouse movement, seems not to be needed\n /*\n // Changes per WEBDEV-2737\n BookReader: zoomed-in 2 page view, clicking page should change the page\n $(element)\n .mousemove(function() {\n e.preventDefault();\n })\n */\n }\n\n this.setClickHandler(\n this.br.prefetchedImgs[this.br.twoPage.currentIndexR],\n { self: this, direction: 'R' },\n handler\n );\n this.setClickHandler(\n this.br.prefetchedImgs[this.br.twoPage.currentIndexL],\n { self: this, direction: 'L' },\n handler\n );\n }\n\n /**\n * Prepare to flip the left page towards the right. This corresponds to moving\n * backward when the page progression is left to right.\n * @param {number} prevL\n * @param {number} prevR\n */\n prepareFlipLeftToRight(prevL, prevR) {\n this.br.prefetchImg(prevL);\n this.br.prefetchImg(prevR);\n\n const height = this.book._getPageHeight(prevL);\n const width = this.book._getPageWidth(prevL);\n const middle = this.br.twoPage.middle;\n const top = this.top();\n const scaledW = this.br.twoPage.height * width / height; // $$$ assumes height of page is dominant\n\n // The gutter is the dividing line between the left and right pages.\n // It is offset from the middle to create the illusion of thickness to the pages\n const gutter = middle + this.gutterOffsetForIndex(prevL);\n\n const leftCSS = {\n position: 'absolute',\n left: `${gutter - scaledW}px`,\n right: '', // clear right property\n top: `${top}px`,\n height: this.br.twoPage.height,\n width: `${scaledW}px`,\n zIndex: 1\n };\n\n $(this.br.prefetchedImgs[prevL]).css(leftCSS);\n\n const $twoPageViewEl = this.br.refs.$brTwoPageView;\n $twoPageViewEl.append(this.br.prefetchedImgs[prevL]);\n\n const rightCSS = {\n position: 'absolute',\n left: `${gutter}px`,\n right: '',\n top: `${top}px`,\n height: this.br.twoPage.height,\n width: '0',\n zIndex: 2\n };\n\n $(this.br.prefetchedImgs[prevR]).css(rightCSS);\n\n $twoPageViewEl.append(this.br.prefetchedImgs[prevR]);\n }\n\n /**\n * // $$$ mang we're adding an extra pixel in the middle. See https://bugs.edge.launchpad.net/gnubook/+bug/411667\n */\n prepareFlipRightToLeft(nextL, nextR) {\n // Prefetch images\n this.br.prefetchImg(nextL);\n this.br.prefetchImg(nextR);\n\n let height = this.book._getPageHeight(nextR);\n let width = this.book._getPageWidth(nextR);\n const middle = this.br.twoPage.middle;\n const top = this.top();\n let scaledW = this.br.twoPage.height * width / height;\n\n const gutter = middle + this.gutterOffsetForIndex(nextL);\n\n $(this.br.prefetchedImgs[nextR]).css({\n position: 'absolute',\n left: `${gutter}px`,\n top: `${top}px`,\n height: this.br.twoPage.height,\n width: `${scaledW}px`,\n zIndex: 1,\n });\n\n const $twoPageViewEl = this.br.refs.$brTwoPageView;\n $twoPageViewEl.append(this.br.prefetchedImgs[nextR]);\n\n height = this.book._getPageHeight(nextL);\n width = this.book._getPageWidth(nextL);\n scaledW = this.br.twoPage.height * width / height;\n\n $(this.br.prefetchedImgs[nextL]).css({\n position: 'absolute',\n right: `${$twoPageViewEl.prop('clientWidth') - gutter}px`,\n top: `${top}px`,\n height: this.br.twoPage.height,\n width: '0px', // Start at 0 width, then grow to the left\n zIndex: 2,\n });\n\n $twoPageViewEl.append(this.br.prefetchedImgs[nextL]);\n }\n\n getPageWidth(index) {\n // We return the width based on the dominant height\n const height = this.book._getPageHeight(index);\n const width = this.book._getPageWidth(index);\n // $$$ we assume width is relative to current spread\n return Math.floor(this.br.twoPage.height * width / height);\n }\n\n /**\n * Returns the position of the gutter (line between the page images)\n */\n gutter() {\n return this.br.twoPage.middle + this.gutterOffsetForIndex(this.br.twoPage.currentIndexL);\n }\n\n /**\n * Returns the offset for the top of the page images\n */\n top() {\n return this.br.twoPage.coverExternalPadding + this.br.twoPage.coverInternalPadding; // $$$ + border?\n }\n\n /**\n * Returns the width of the cover div given the total page width\n * @param {number} totalPageWidth\n * @return {number}\n */\n coverWidth(totalPageWidth) {\n return totalPageWidth + this.br.twoPage.edgeWidth + 2 * this.br.twoPage.coverInternalPadding;\n }\n\n /**\n * Returns the percentage offset into twopageview div at the center of container div\n */\n getViewCenter() {\n const { $brContainer, $brTwoPageView } = this.br.refs;\n const center = {};\n\n const containerOffset = $brContainer.offset();\n const viewOffset = $brTwoPageView.offset();\n center.percentageX = (containerOffset.left - viewOffset.left + ($brContainer.prop('clientWidth') >> 1)) / this.br.twoPage.totalWidth;\n center.percentageY = (containerOffset.top - viewOffset.top + ($brContainer.prop('clientHeight') >> 1)) / this.br.twoPage.totalHeight;\n\n return center;\n }\n\n /**\n * Centers the point given by percentage from left,top of twopageview\n * @param {number} percentageX\n * @param {number} percentageY\n */\n centerView(percentageX, percentageY) {\n if ('undefined' == typeof(percentageX)) {\n percentageX = 0.5;\n }\n if ('undefined' == typeof(percentageY)) {\n percentageY = 0.5;\n }\n\n const viewWidth = this.br.refs.$brTwoPageView.width();\n const containerClientWidth = this.br.refs.$brContainer.prop('clientWidth');\n const intoViewX = percentageX * viewWidth;\n\n const viewHeight = this.br.refs.$brTwoPageView.height();\n const containerClientHeight = this.br.refs.$brContainer.prop('clientHeight');\n const intoViewY = percentageY * viewHeight;\n\n if (viewWidth < containerClientWidth) {\n // Can fit width without scrollbars - center by adjusting offset\n this.br.refs.$brTwoPageView.css('left', `${(containerClientWidth >> 1) - intoViewX}px`);\n } else {\n // Need to scroll to center\n this.br.refs.$brTwoPageView.css('left', 0);\n this.br.refs.$brContainer.scrollLeft(intoViewX - (containerClientWidth >> 1));\n }\n\n if (viewHeight < containerClientHeight) {\n // Fits with scrollbars - add offset\n this.br.refs.$brTwoPageView.css('top', `${(containerClientHeight >> 1) - intoViewY}px`);\n } else {\n this.br.refs.$brTwoPageView.css('top', 0);\n this.br.refs.$brContainer.scrollTop(intoViewY - (containerClientHeight >> 1));\n }\n }\n\n /**\n * Returns the integer height of the click-to-flip areas at the edges of the book\n * @return {number}\n */\n flipAreaHeight() {\n return Math.floor(this.br.twoPage.height);\n }\n\n /**\n * Returns the the integer width of the flip areas\n * @return {number}\n */\n flipAreaWidth() {\n const max = 100; // $$$ TODO base on view width?\n const min = 10;\n\n const width = this.br.twoPage.width * 0.15;\n return Math.floor(clamp(width, min, max));\n }\n\n /**\n * Returns integer top offset for flip areas\n * @return {number}\n */\n flipAreaTop() {\n return Math.floor(this.br.twoPage.bookCoverDivTop + this.br.twoPage.coverInternalPadding);\n }\n\n /**\n * Left offset for left flip area\n * @return {number}\n */\n leftFlipAreaLeft() {\n return Math.floor(this.br.twoPage.gutter - this.br.twoPage.scaledWL);\n }\n\n /**\n * Left offset for right flip area\n * @return {number}\n */\n rightFlipAreaLeft() {\n return Math.floor(this.br.twoPage.gutter + this.br.twoPage.scaledWR - this.flipAreaWidth());\n }\n\n /**\n * Position calculation shared between search and text-to-speech functions\n */\n setHilightCss(div, index, left, right, top, bottom) {\n // We calculate the reduction factor for the specific page because it can be different\n // for each page in the spread\n const height = this.book._getPageHeight(index);\n const width = this.book._getPageWidth(index);\n const reduce = this.br.twoPage.height / height;\n const scaledW = Math.floor(width * reduce);\n\n const gutter = this.gutter();\n let pageL;\n if ('L' == this.book.getPageSide(index)) {\n pageL = gutter - scaledW;\n } else {\n pageL = gutter;\n }\n const pageT = this.top();\n\n $(div).css({\n width: `${(right - left) * reduce}px`,\n height: `${(bottom - top) * reduce}px`,\n left: `${pageL + left * reduce}px`,\n top: `${pageT + top * reduce}px`\n });\n }\n\n /**\n * Returns the gutter offset for the spread containing the given index.\n * This function supports RTL\n * @param {number} pindex\n * @return {number}\n */\n gutterOffsetForIndex(pindex) {\n // To find the offset of the gutter from the middle we calculate our percentage distance\n // through the book (0..1), remap to (-0.5..0.5) and multiply by the total page edge width\n let offset = Math.floor(((pindex / this.book.getNumLeafs()) - 0.5) * this.br.twoPage.edgeWidth);\n\n // But then again for RTL it's the opposite\n if ('rl' == this.br.pageProgression) {\n offset *= -1;\n }\n\n return offset;\n }\n\n /**\n * Returns the width of the leaf edge div for the page with index given\n * @param {number} pindex\n * @return {number}\n */\n leafEdgeWidth(pindex) {\n // $$$ could there be single pixel rounding errors for L vs R?\n if ((this.book.getPageSide(pindex) == 'L') && (this.br.pageProgression != 'rl')) {\n return Math.floor( (pindex / this.book.getNumLeafs()) * this.br.twoPage.edgeWidth + 0.5);\n } else {\n return Math.floor( (1 - pindex / this.book.getNumLeafs()) * this.br.twoPage.edgeWidth + 0.5);\n }\n }\n\n /**\n * Returns the target jump leaf given a page coordinate (inside the left page edge div)\n * @param {number} pageX\n * @return {PageIndex}\n */\n jumpIndexForLeftEdgePageX(pageX) {\n let jumpIndex;\n if ('rl' != this.br.pageProgression) {\n // LTR - flipping backward\n jumpIndex = this.br.twoPage.currentIndexL - ($(this.leafEdgeL).offset().left + $(this.leafEdgeL).width() - pageX) * 10;\n\n // browser may have resized the div due to font size change -- see https://bugs.launchpad.net/gnubook/+bug/333570\n jumpIndex = clamp(Math.round(jumpIndex), this.br.firstDisplayableIndex(), this.br.twoPage.currentIndexL - 2);\n return jumpIndex;\n\n } else {\n jumpIndex = this.br.twoPage.currentIndexL + ($(this.leafEdgeL).offset().left + $(this.leafEdgeL).width() - pageX) * 10;\n jumpIndex = clamp(Math.round(jumpIndex), this.br.twoPage.currentIndexL + 2, this.br.lastDisplayableIndex());\n return jumpIndex;\n }\n }\n\n /**\n * Returns the target jump leaf given a page coordinate (inside the right page edge div)\n * @param {number} pageX\n * @return {PageIndex}\n */\n jumpIndexForRightEdgePageX(pageX) {\n let jumpIndex;\n if ('rl' != this.br.pageProgression) {\n // LTR\n jumpIndex = this.br.twoPage.currentIndexL + (pageX - $(this.leafEdgeR).offset().left) * 10;\n jumpIndex = clamp(Math.round(jumpIndex), this.br.twoPage.currentIndexL + 2, this.br.lastDisplayableIndex());\n return jumpIndex;\n } else {\n jumpIndex = this.br.twoPage.currentIndexL - (pageX - $(this.leafEdgeR).offset().left) * 10;\n jumpIndex = clamp(Math.round(jumpIndex), this.br.firstDisplayableIndex(), this.br.twoPage.currentIndexL - 2);\n return jumpIndex;\n }\n }\n\n /**\n * Fetches the currently displayed images (if not already fetching)\n * as wells as any nearby pages.\n */\n prefetch() {\n // $$$ We should check here if the current indices have finished\n // loading (with some timeout) before loading more page images\n // See https://bugs.edge.launchpad.net/bookreader/+bug/511391\n const { max, min } = Math;\n const { book } = this;\n const { currentIndexL, currentIndexR } = this.br.twoPage;\n const ADJACENT_PAGES_TO_LOAD = 3;\n\n // currentIndexL can be -1; getPage returns the last page of the book\n // when given -1, so need to prevent that.\n let lowPage = book.getPage(max(0, min(currentIndexL, currentIndexR)));\n let highPage = book.getPage(max(currentIndexL, currentIndexR));\n for (let i = 0; i < ADJACENT_PAGES_TO_LOAD + 1; i++) {\n if (lowPage) {\n this.br.prefetchImg(lowPage.index);\n lowPage = lowPage.findPrev({ combineConsecutiveUnviewables: true });\n }\n\n if (highPage) {\n this.br.prefetchImg(highPage.index);\n highPage = highPage.findNext({ combineConsecutiveUnviewables: true });\n }\n }\n }\n}\n\n/**\n * @implements {BookReaderOptions[\"twoPage\"]}\n * @typedef {object} TwoPageState\n * @property {number} coverInternalPadding\n * @property {number} coverExternalPadding\n *\n * @property {import('./options.js').AutoFitValues} autofit\n * @property {number} width\n * @property {number} height\n * @property {number} currentIndexL\n * @property {number} currentIndexR\n * @property {number} scaledWL\n * @property {number} scaledWR\n * @property {number} gutter\n * @property {Array<{reduce: number, autofit: import('./options.js').AutoFitValues}>} reductionFactors\n * @property {number} totalHeight\n * @property {number} totalWidth\n *\n * @property {HTMLDivElement} coverDiv\n * @property {number} bookCoverDivTop\n * @property {number} bookCoverDivLeft\n * @property {number} bookCoverDivWidth\n * @property {number} bookCoverDivHeight\n *\n * @property {number} leafEdgeWidthL\n * @property {number} leafEdgeWidthR\n *\n * @property {number} bookSpineDivTop\n * @property {number} bookSpineDivLeft\n * @property {number} bookSpineDivWidth\n * @property {number} bookSpineDivHeight\n *\n * @property {number} edgeWidth\n * @property {number} middle\n */\n","/*\nCopyright(c)2008-2019 Internet Archive. Software license AGPL version 3.\n\nThis file is part of BookReader.\n\n BookReader is free software: you can redistribute it and/or modify\n it under the terms of the GNU Affero General Public License as published by\n the Free Software Foundation, either version 3 of the License, or\n (at your option) any later version.\n\n BookReader is distributed in the hope that it will be useful,\n but WITHOUT ANY WARRANTY; without even the implied warranty of\n MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n GNU Affero General Public License for more details.\n\n You should have received a copy of the GNU Affero General Public License\n along with BookReader. If not, see ![]()
', {\n src: this._getPageURI(index, this.reduce, 0),\n srcset: this._getPageURISrcset(index, this.reduce, 0)\n });\n pageContainer.append(img);\n\n BRpageViewEl.appendChild(pageContainer[0]);\n }\n\n leafTop += height + 10;\n }\n\n for (const index of this.displayedIndices) {\n if (utils.notInArray(index, indicesToDisplay)) {\n this.$(`.pagediv${index}`).remove();\n }\n }\n\n this.displayedIndices = indicesToDisplay.slice();\n if (this.enableSearch) this.updateSearchHilites();\n\n this.updateToolbarZoom(this.reduce);\n\n // Update the slider\n this.updateNavIndexThrottled();\n};\n\n/**\n * Draws the thumbnail view\n * @param {number} optional If seekIndex is defined, the view will be drawn\n * with that page visible (without any animated scrolling).\n */\nBookReader.prototype.drawLeafsThumbnail = function(seekIndex) {\n const { floor } = Math;\n const { book } = this._models;\n const viewWidth = this.refs.$brContainer.prop('scrollWidth') - 20; // width minus buffer\n\n let leafHeight;\n let rightPos = 0;\n let bottomPos = 0;\n let maxRight = 0;\n let currentRow = 0;\n let leafIndex = 0;\n const leafMap = [];\n\n // Will be set to top of requested seek index, if set\n let seekTop;\n\n // Calculate the position of every thumbnail. $$$ cache instead of calculating on every draw\n for (const page of book.pagesIterator({ combineConsecutiveUnviewables: true })) {\n const leafWidth = this.thumbWidth;\n if (rightPos + (leafWidth + this.thumbPadding) > viewWidth) {\n currentRow++;\n rightPos = 0;\n leafIndex = 0;\n }\n\n // Init current row in leafMap\n if (!leafMap[currentRow]) { leafMap[currentRow] = {}; }\n if (!leafMap[currentRow].leafs) {\n leafMap[currentRow].leafs = [];\n leafMap[currentRow].height = 0;\n leafMap[currentRow].top = 0;\n }\n leafMap[currentRow].leafs[leafIndex] = {\n num: page.index,\n left: rightPos,\n };\n\n leafHeight = floor((page.height * this.thumbWidth) / page.width);\n if (leafHeight > leafMap[currentRow].height) {\n leafMap[currentRow].height = leafHeight;\n }\n if (leafIndex === 0) { bottomPos += this.thumbPadding + leafMap[currentRow].height; }\n rightPos += leafWidth + this.thumbPadding;\n if (rightPos > maxRight) { maxRight = rightPos; }\n leafIndex++;\n\n if (page.index == seekIndex) {\n seekTop = bottomPos - this.thumbPadding - leafMap[currentRow].height;\n }\n }\n\n // reset the bottom position based on thumbnails\n this.refs.$brPageViewEl.height(bottomPos);\n\n const pageViewBuffer = floor((this.refs.$brContainer.prop('scrollWidth') - maxRight) / 2) - 14;\n\n // If seekTop is defined, seeking was requested and target found\n if (typeof(seekTop) != 'undefined') {\n this.refs.$brContainer.scrollTop(seekTop);\n }\n\n const scrollTop = this.refs.$brContainer.prop('scrollTop');\n const scrollBottom = scrollTop + this.refs.$brContainer.height();\n\n let leafTop = 0;\n let leafBottom = 0;\n const rowsToDisplay = [];\n\n // Visible leafs with least/greatest index\n let leastVisible = book.getNumLeafs() - 1;\n let mostVisible = 0;\n\n // Determine the thumbnails in view\n for (let i = 0; i < leafMap.length; i++) {\n if (!leafMap[i]) { continue; }\n leafBottom += this.thumbPadding + leafMap[i].height;\n const topInView = (leafTop >= scrollTop) && (leafTop <= scrollBottom);\n const bottomInView = (leafBottom >= scrollTop) && (leafBottom <= scrollBottom);\n const middleInView = (leafTop <= scrollTop) && (leafBottom >= scrollBottom);\n if (topInView || bottomInView || middleInView) {\n rowsToDisplay.push(i);\n if (leafMap[i].leafs[0].num < leastVisible) {\n leastVisible = leafMap[i].leafs[0].num;\n }\n if (leafMap[i].leafs[leafMap[i].leafs.length - 1].num > mostVisible) {\n mostVisible = leafMap[i].leafs[leafMap[i].leafs.length - 1].num;\n }\n }\n if (leafTop > leafMap[i].top) { leafMap[i].top = leafTop; }\n leafTop = leafBottom;\n }\n\n // create a buffer of preloaded rows before and after the visible rows\n const firstRow = rowsToDisplay[0];\n const lastRow = rowsToDisplay[rowsToDisplay.length - 1];\n for (let i = 1; i < this.thumbRowBuffer + 1; i++) {\n if (lastRow + i < leafMap.length) { rowsToDisplay.push(lastRow + i); }\n }\n for (let i = 1; i < this.thumbRowBuffer + 1; i++) {\n if (firstRow - i >= 0) { rowsToDisplay.push(firstRow - i); }\n }\n\n // Create the thumbnail divs and images (lazy loaded)\n for (const row of rowsToDisplay) {\n if (utils.notInArray(row, this.displayedRows)) {\n if (!leafMap[row]) { continue; }\n for (const { num: leaf, left: leafLeft } of leafMap[row].leafs) {\n const leafWidth = this.thumbWidth;\n const leafHeight = floor((book.getPageHeight(leaf) * this.thumbWidth) / book.getPageWidth(leaf));\n const leafTop = leafMap[row].top;\n let left = leafLeft + pageViewBuffer;\n if ('rl' == this.pageProgression) {\n left = viewWidth - leafWidth - left;\n }\n\n left += this.thumbPadding;\n const pageContainer = this._createPageContainer(leaf, {\n width: `${leafWidth}px`,\n height: `${leafHeight}px`,\n top: `${leafTop}px`,\n left: `${left}px`,\n });\n\n pageContainer.data('leaf', leaf).on('mouseup', event => {\n // We want to suppress the fragmentChange triggers in `updateFirstIndex` and `switchMode`\n // because otherwise it repeatedly triggers listeners and we get in an infinite loop.\n // We manually trigger the `fragmentChange` once at the end.\n this.updateFirstIndex(leaf, { suppressFragmentChange: true });\n if (this.prevReadMode === this.constMode1up || this.prevReadMode === this.constMode2up) {\n this.switchMode(this.prevReadMode, { suppressFragmentChange: true });\n } else {\n this.switchMode(this.constMode1up, { suppressFragmentChange: true });\n }\n this.trigger(BookReader.eventNames.fragmentChange);\n event.stopPropagation();\n });\n\n this.refs.$brPageViewEl.append(pageContainer);\n\n const img = document.createElement(\"img\");\n const thumbReduce = floor(book.getPageWidth(leaf) / this.thumbWidth);\n\n $(img).attr('src', `${this.imagesBaseURL}transparent.png`)\n .css({ width: `${leafWidth}px`, height: `${leafHeight}px` })\n .addClass('BRlazyload')\n // Store the URL of the image that will replace this one\n .data('srcURL', this._getPageURI(leaf, thumbReduce));\n pageContainer.append(img);\n }\n }\n }\n\n // Remove thumbnails that are not to be displayed\n for (const row of this.displayedRows) {\n if (utils.notInArray(row, rowsToDisplay)) {\n for (const { num: index } of leafMap[row].leafs) {\n this.$(`.pagediv${index}`).remove();\n }\n }\n }\n\n // Update which page is considered current to make sure a visible page is the current one\n const currentIndex = this.currentIndex();\n if (currentIndex < leastVisible) {\n this.updateFirstIndex(leastVisible);\n } else if (currentIndex > mostVisible) {\n this.updateFirstIndex(mostVisible);\n }\n\n this.displayedRows = rowsToDisplay.slice();\n\n // remove previous highlights\n this.$('.BRpagedivthumb_highlight').removeClass('BRpagedivthumb_highlight');\n\n // highlight current page\n this.$('.pagediv' + this.currentIndex()).addClass('BRpagedivthumb_highlight');\n\n this.lazyLoadThumbnails();\n\n this.updateToolbarZoom(this.reduce);\n};\n\nBookReader.prototype.lazyLoadThumbnails = function() {\n // We check the complete property since load may not be fired if loading from the cache\n this.$('.BRlazyloading').filter('[complete=true]').removeClass('BRlazyloading');\n\n var loading = this.$('.BRlazyloading').length;\n var toLoad = this.thumbMaxLoading - loading;\n\n var self = this;\n\n if (toLoad > 0) {\n // $$$ TODO load those near top (but not beyond) page view first\n this.refs.$brPageViewEl.find('img.BRlazyload').filter(':lt(' + toLoad + ')').each( function() {\n self.lazyLoadImage(this);\n });\n }\n};\n\nBookReader.prototype.lazyLoadImage = function (dummyImage) {\n var img = new Image();\n var self = this;\n\n $(img)\n .addClass('BRlazyloading')\n .one('load', function() {\n $(this).removeClass('BRlazyloading');\n\n // $$$ Calling lazyLoadThumbnails here was causing stack overflow on IE so\n // we call the function after a slight delay. Also the img.complete property\n // is not yet set in IE8 inside this onload handler\n setTimeout(function() { self.lazyLoadThumbnails(); }, 100);\n })\n .one('error', function() {\n // Remove class so we no longer count as loading\n $(this).removeClass('BRlazyloading');\n })\n\n //the width set with .attr is ignored by Internet Explorer, causing it to show the image at its original size\n //but with this one line of css, even IE shows the image at the proper size\n .css({\n 'width': $(dummyImage).width() + 'px',\n 'height': $(dummyImage).height() + 'px'\n })\n .attr({\n 'width': $(dummyImage).width(),\n 'height': $(dummyImage).height(),\n 'src': $(dummyImage).data('srcURL')\n });\n\n // replace with the new img\n $(dummyImage).before(img).remove();\n\n img = null; // tidy up closure\n};\n\n/**\n * A throttled version of drawLeafs\n */\nBookReader.prototype.drawLeafsThrottled = utils.throttle(\n BookReader.prototype.drawLeafs,\n 250 // 250 ms gives quick feedback, but doesn't eat cpu\n);\n\n/**\n * @param {number} direction Pass 1 to zoom in, anything else to zoom out\n */\nBookReader.prototype.zoom = function(direction) {\n switch (this.mode) {\n case this.constMode1up:\n if (direction == 1) {\n // XXX other cases\n this.zoom1up('in');\n } else {\n this.zoom1up('out');\n }\n break\n case this.constMode2up:\n if (direction == 1) {\n // XXX other cases\n this.zoom2up('in');\n } else {\n this.zoom2up('out');\n }\n break\n case this.constModeThumb:\n // XXX update zoomThumb for named directions\n this.zoomThumb(direction);\n break\n }\n\n this.textSelectionPlugin?.stopPageFlip(this.refs.$brContainer);\n return;\n};\n\nBookReader.prototype.zoom1up = function(direction) {\n if (this.constMode2up == this.mode) { //can only zoom in 1-page mode\n this.switchMode(this.constMode1up);\n return;\n }\n\n var reduceFactor = this.nextReduce(this.reduce, direction, this.onePage.reductionFactors);\n\n if (this.reduce == reduceFactor.reduce) {\n // Already at this level\n return;\n }\n\n this.reduce = reduceFactor.reduce; // $$$ incorporate into function\n this.onePage.autofit = reduceFactor.autofit;\n\n this.pageScale = this.reduce; // preserve current reduce\n\n this.resizePageView1up();\n this.updateToolbarZoom(this.reduce);\n\n // Recalculate search hilites\n if (this.enableSearch) {\n this.removeSearchHilites();\n this.updateSearchHilites();\n }\n};\n\n/**\n * Resizes the inner container to fit within the visible space to prevent\n * the top toolbar and bottom navbar from clipping the visible book\n *\n * @param { boolean } animate - optional\n * When used, BookReader will fill the main container with the book's content.\n * This is primarily for 1up view - a follow up animation to the nav animation\n * So resize isn't perceived sharp/jerky\n */\nBookReader.prototype.resizeBRcontainer = function(animate) {\n if (animate) {\n this.refs.$brContainer.animate({\n top: this.getToolBarHeight(),\n bottom: this.getFooterHeight()\n }, this.constResizeAnimationDuration, 'linear');\n } else {\n this.refs.$brContainer.css({\n top: this.getToolBarHeight(),\n bottom: this.getFooterHeight()\n });\n }\n}\n\n/**\n * Resize the current one page view\n * Note this calls drawLeafs\n */\nBookReader.prototype.resizePageView1up = function() {\n var viewWidth = this.refs.$brContainer.prop('clientWidth');\n var oldScrollTop = this.refs.$brContainer.prop('scrollTop');\n var oldPageViewHeight = this.refs.$brPageViewEl.height();\n var oldPageViewWidth = this.refs.$brPageViewEl.width();\n\n // May have come here after preparing the view, in which case the scrollTop and view height are not set\n\n var scrollRatio = 0;\n if (oldScrollTop > 0) {\n // We have scrolled - implies view has been set up\n var oldCenterY = this.centerY1up();\n var oldCenterX = this.centerX1up();\n scrollRatio = oldCenterY / oldPageViewHeight;\n } else {\n // Have not scrolled, e.g. because in new container\n\n // We set the scroll ratio so that the current index will still be considered the\n // current index in drawLeafsOnePage after we create the new view container\n\n // Make sure this will count as current page after resize\n var fudgeFactor = (this._models.book.getPageHeight(this.currentIndex()) / this.reduce) * 0.6;\n var oldLeafTop = this.onePageGetPageTop(this.currentIndex()) + fudgeFactor;\n var oldViewDimensions = this.onePageCalculateViewDimensions(this.reduce, this.padding);\n scrollRatio = oldLeafTop / oldViewDimensions.height;\n }\n\n // Recalculate 1up reduction factors\n this.onePageCalculateReductionFactors();\n // Update current reduce (if in autofit)\n if (this.onePage.autofit) {\n var reductionFactor = this.nextReduce(this.reduce, this.onePage.autofit, this.onePage.reductionFactors);\n this.reduce = reductionFactor.reduce;\n }\n\n var viewDimensions = this.onePageCalculateViewDimensions(this.reduce, this.padding);\n\n this.refs.$brPageViewEl.height(viewDimensions.height);\n this.refs.$brPageViewEl.width(viewDimensions.width);\n\n\n var newCenterY = scrollRatio * viewDimensions.height;\n var newTop = Math.max(0, Math.floor( newCenterY - this.refs.$brContainer.height() / 2 ));\n this.refs.$brContainer.prop('scrollTop', newTop);\n\n // We use clientWidth here to avoid miscalculating due to scroll bar\n var newCenterX = oldCenterX * (viewWidth / oldPageViewWidth);\n var newLeft = newCenterX - this.refs.$brContainer.prop('clientWidth') / 2;\n newLeft = Math.max(newLeft, 0);\n this.refs.$brContainer.prop('scrollLeft', newLeft);\n\n this.refs.$brPageViewEl.empty();\n this.displayedIndices = [];\n this.drawLeafs();\n\n if (this.enableSearch) {\n this.removeSearchHilites();\n this.updateSearchHilites();\n }\n};\n\n/**\n * Calculate the dimensions for a one page view with images at the given reduce and padding\n * @param {number} reduce\n * @param {number} padding\n */\nBookReader.prototype.onePageCalculateViewDimensions = function(reduce, padding) {\n const { floor } = Math;\n const { book } = this._models;\n let viewWidth = 0;\n let viewHeight = 0;\n for (const page of book.pagesIterator({ combineConsecutiveUnviewables: true })) {\n viewHeight += floor(page.height / reduce) + padding;\n const width = floor(page.width / reduce);\n if (width > viewWidth) viewWidth = width;\n }\n return { width: viewWidth, height: viewHeight };\n};\n\n/**\n * Returns the current offset of the viewport center in scaled document coordinates.\n * @return {number}\n */\nBookReader.prototype.centerX1up = function() {\n var centerX;\n if (this.refs.$brPageViewEl.width() < this.refs.$brContainer.prop('clientWidth')) { // fully shown\n centerX = this.refs.$brPageViewEl.width();\n } else {\n centerX = this.refs.$brContainer.prop('scrollLeft') + this.refs.$brContainer.prop('clientWidth') / 2;\n }\n centerX = Math.floor(centerX);\n return centerX;\n};\n\n/**\n * Returns the current offset of the viewport center in scaled document coordinates.\n * @return {number}\n */\nBookReader.prototype.centerY1up = function() {\n var centerY = this.refs.$brContainer.prop('scrollTop') + this.refs.$brContainer.height() / 2;\n return Math.floor(centerY);\n};\n\nBookReader.prototype.centerPageView = function() {\n var scrollWidth = this.refs.$brContainer.prop('scrollWidth');\n var clientWidth = this.refs.$brContainer.prop('clientWidth');\n if (scrollWidth > clientWidth) {\n this.refs.$brContainer.prop('scrollLeft', (scrollWidth - clientWidth) / 2);\n }\n};\n\nBookReader.prototype.zoomThumb = function(direction) {\n var oldColumns = this.thumbColumns;\n switch (direction) {\n case -1:\n this.thumbColumns += 1;\n break;\n case 1:\n this.thumbColumns -= 1;\n break;\n }\n\n // clamp\n if (this.thumbColumns < 2) {\n this.thumbColumns = 2;\n } else if (this.thumbColumns > 8) {\n this.thumbColumns = 8;\n }\n\n if (this.thumbColumns != oldColumns) {\n this.prepareThumbnailView();\n }\n};\n\n/**\n * Returns the width per thumbnail to display the requested number of columns\n * Note: #BRpageview must already exist since its width is used to calculate the\n * thumbnail width\n * @param {number}\n * @param {number}\n */\nBookReader.prototype.getThumbnailWidth = function(thumbnailColumns) {\n var padding = (thumbnailColumns + 1) * this.thumbPadding;\n var width = (this.refs.$brPageViewEl.width() - padding) / (thumbnailColumns + 0.5); // extra 0.5 is for some space at sides\n return parseInt(width);\n};\n\n/**\n * Quantizes the given reduction factor to closest power of two from set from 12.5% to 200%\n * @param {number}\n * @param {array}\n * @return {number}\n */\nBookReader.prototype.quantizeReduce = function(reduce, reductionFactors) {\n var quantized = reductionFactors[0].reduce;\n var distance = Math.abs(reduce - quantized);\n var newDistance;\n\n for (var i = 1; i < reductionFactors.length; i++) {\n newDistance = Math.abs(reduce - reductionFactors[i].reduce);\n if (newDistance < distance) {\n distance = newDistance;\n quantized = reductionFactors[i].reduce;\n }\n }\n return quantized;\n};\n\n/**\n * @param {number} currentReduce\n * @param {'in' | 'out' | 'auto' | 'height' | 'width'} direction\n * @param {array} reductionFactors should be array of sorted reduction factors\n * e.g. [ {reduce: 0.25, autofit: null}, {reduce: 0.3, autofit: 'width'}, {reduce: 1, autofit: null} ]\n */\nBookReader.prototype.nextReduce = function(currentReduce, direction, reductionFactors) {\n // XXX add 'closest', to replace quantize function\n var i;\n var newReduceIndex;\n\n if (direction === 'in') {\n newReduceIndex = 0;\n for (i = 1; i < reductionFactors.length; i++) {\n if (reductionFactors[i].reduce < currentReduce) {\n newReduceIndex = i;\n }\n }\n return reductionFactors[newReduceIndex];\n } else if (direction === 'out') { // zoom out\n var lastIndex = reductionFactors.length - 1;\n newReduceIndex = lastIndex;\n\n for (i = lastIndex; i >= 0; i--) {\n if (reductionFactors[i].reduce > currentReduce) {\n newReduceIndex = i;\n }\n }\n return reductionFactors[newReduceIndex];\n } else if (direction === 'auto') {\n // Auto mode chooses the least reduction\n var choice = null;\n for (i = 0; i < reductionFactors.length; i++) {\n if (reductionFactors[i].autofit === 'height' || reductionFactors[i].autofit === 'width') {\n if (choice === null || choice.reduce < reductionFactors[i].reduce) {\n choice = reductionFactors[i];\n }\n }\n }\n if (choice) {\n return choice;\n }\n } else if (direction === 'height' || direction === 'width') {\n // Asked for specific autofit mode\n for (i = 0; i < reductionFactors.length; i++) {\n if (reductionFactors[i].autofit === direction) {\n return reductionFactors[i];\n }\n }\n }\n\n alert('Could not find reduction factor for direction ' + direction);\n return reductionFactors[0];\n\n};\n\nBookReader.prototype._reduceSort = function(a, b) {\n return a.reduce - b.reduce;\n};\n\n/**\n * Attempts to jump to page\n * @param {string}\n * @return {boolean} Returns true if page could be found, false otherwise.\n */\nBookReader.prototype.jumpToPage = function(pageNum) {\n var pageIndex = this._models.book.parsePageString(pageNum);\n\n if ('undefined' != typeof(pageIndex)) {\n this.jumpToIndex(pageIndex);\n return true;\n }\n\n // Page not found\n return false;\n};\n\n/**\n * Check whether the specified index is currently displayed\n * @param {PageIndex} index\n */\nBookReader.prototype._isIndexDisplayed = function(index) {\n // One up \"caches\" pages +- current, so exclude those in the test.\n return this.constMode1up == this.mode ? this.displayedIndices.slice(1, -1).includes(index) :\n this.displayedIndices ? this.displayedIndices.includes(index) :\n this.currentIndex() == index;\n}\n\n/**\n * Changes the current page\n * @param {PageIndex} index\n * @param {number} [pageX]\n * @param {number} [pageY]\n * @param {boolean} [noAnimate]\n */\nBookReader.prototype.jumpToIndex = function(index, pageX, pageY, noAnimate) {\n const prevCurrentIndex = this.currentIndex();\n\n // Don't jump into specific unviewable page\n const page = this._models.book.getPage(index);\n if (!page.isViewable && page.unviewablesStart != page.index) {\n // If already in unviewable range, jump to end of that range\n const alreadyInPreview = this._isIndexDisplayed(page.unviewablesStart);\n const newIndex = alreadyInPreview ? page.findNext({ combineConsecutiveUnviewables: true }).index : page.unviewablesStart;\n return this.jumpToIndex(newIndex, pageX, pageY, noAnimate);\n }\n\n this.trigger(BookReader.eventNames.stop);\n\n if (this.constMode2up == this.mode) {\n // By checking against min/max we do nothing if requested index\n // is current\n if (index < Math.min(this.twoPage.currentIndexL, this.twoPage.currentIndexR)) {\n this.flipBackToIndex(index);\n } else if (index > Math.max(this.twoPage.currentIndexL, this.twoPage.currentIndexR)) {\n this.flipFwdToIndex(index);\n }\n } else if (this.constModeThumb == this.mode) {\n const { floor } = Math;\n const { book } = this._models;\n const viewWidth = this.refs.$brContainer.prop('scrollWidth') - 20; // width minus buffer\n const leafWidth = this.thumbWidth;\n let leafTop = 0;\n let rightPos = 0;\n let bottomPos = 0;\n let rowHeight = 0;\n let leafIndex = 0;\n\n for (let i = 0; i <= index; i++) {\n if (rightPos + (leafWidth + this.thumbPadding) > viewWidth) {\n rightPos = 0;\n rowHeight = 0;\n leafIndex = 0;\n }\n\n const leafHeight = floor((book.getPageHeight(leafIndex) * this.thumbWidth) / book.getPageWidth(leafIndex), 10);\n if (leafHeight > rowHeight) { rowHeight = leafHeight; }\n if (leafIndex == 0) {\n leafTop = bottomPos;\n bottomPos += this.thumbPadding + rowHeight;\n }\n rightPos += leafWidth + this.thumbPadding;\n leafIndex++;\n }\n this.updateFirstIndex(index);\n if (this.refs.$brContainer.prop('scrollTop') == leafTop) {\n this.drawLeafs();\n } else {\n this.animating = true;\n this.refs.$brContainer.stop(true)\n .animate({ scrollTop: leafTop }, 'fast', () => { this.animating = false });\n }\n } else { // 1up\n const { abs, floor } = Math;\n let offset = 0;\n let leafTop = this.onePageGetPageTop(index);\n let leafLeft = 0;\n\n if (pageY) {\n const clientHeight = this.refs.$brContainer.prop('clientHeight');\n offset = floor(pageY / this.reduce) - floor(clientHeight / 2);\n leafTop += offset;\n } else {\n // Show page just a little below the top\n leafTop -= this.padding / 2;\n }\n\n if (pageX) {\n const clientWidth = this.refs.$brContainer.prop('clientWidth');\n offset = floor(pageX / this.reduce) - floor(clientWidth / 2);\n leafLeft += offset;\n } else {\n // Preserve left position\n leafLeft = this.refs.$brContainer.scrollLeft();\n }\n\n // Only animate for small distances\n if (!noAnimate && abs(prevCurrentIndex - index) <= 4) {\n this.animating = true;\n this.refs.$brContainer.stop(true).animate({\n scrollTop: leafTop,\n scrollLeft: leafLeft,\n }, 'fast', () => { this.animating = false });\n } else {\n this.refs.$brContainer.stop(true).prop('scrollTop', leafTop);\n }\n }\n};\n\n/**\n * Return mode or 1up if initial thumb\n * @param {number}\n * @see BookReader.prototype.drawLeafsThumbnail\n */\nBookReader.prototype.getPrevReadMode = function(mode) {\n if (mode === BookReader.constMode1up || mode === BookReader.constMode2up) {\n return mode;\n } else if (this.prevReadMode === null) {\n // Initial thumb, return 1up\n return BookReader.constMode1up;\n }\n}\n\n/**\n * Switches the mode (eg 1up 2up thumb)\n * @param {number}\n * @param {object} [options]\n * @param {boolean} [options.suppressFragmentChange = false]\n */\nBookReader.prototype.switchMode = function(\n mode,\n { suppressFragmentChange = false } = {}\n) {\n // Skip checks before init() complete\n if (this.init.initComplete) {\n if (mode === this.mode) {\n return;\n }\n if (!this.canSwitchToMode(mode)) {\n return;\n }\n }\n\n this.trigger(BookReader.eventNames.stop);\n if (this.enableSearch) this.removeSearchHilites();\n\n this.prevReadMode = this.getPrevReadMode(this.mode);\n\n this.mode = mode;\n\n // reinstate scale if moving from thumbnail view\n if (this.pageScale !== this.reduce) {\n this.reduce = this.pageScale;\n }\n\n // $$$ TODO preserve center of view when switching between mode\n // See https://bugs.edge.launchpad.net/gnubook/+bug/416682\n\n // XXX maybe better to preserve zoom in each mode\n if (this.constMode1up == mode) {\n this.onePageCalculateReductionFactors();\n this.reduce = this.quantizeReduce(this.reduce, this.onePage.reductionFactors);\n this.prepareOnePageView();\n } else if (this.constModeThumb == mode) {\n this.reduce = this.quantizeReduce(this.reduce, this.reductionFactors);\n this.prepareThumbnailView();\n } else {\n // $$$ why don't we save autofit?\n // this.twoPage.autofit = null; // Take zoom level from other mode\n this.twoPageCalculateReductionFactors();\n this.reduce = this.quantizeReduce(this.reduce, this.twoPage.reductionFactors);\n this.prepareTwoPageView();\n this.twoPageCenterView(0.5, 0.5); // $$$ TODO preserve center\n }\n\n if (!(this.suppressFragmentChange || suppressFragmentChange)) {\n this.trigger(BookReader.eventNames.fragmentChange);\n }\n var eventName = mode + 'PageViewSelected';\n this.trigger(BookReader.eventNames[eventName]);\n\n this.textSelectionPlugin?.stopPageFlip(this.refs.$brContainer);\n};\n\nBookReader.prototype.updateBrClasses = function() {\n var modeToClass = {};\n modeToClass[this.constMode1up] = 'BRmode1up';\n modeToClass[this.constMode2up] = 'BRmode2Up';\n modeToClass[this.constModeThumb] = 'BRmodeThumb';\n\n this.refs.$br\n .removeClass('BRmode1up BRmode2Up BRmodeThumb')\n .addClass(modeToClass[this.mode]);\n\n if (this.isFullscreen()) {\n this.refs.$br.addClass('fullscreenActive');\n $(document.body).addClass('BRfullscreenActive');\n } else {\n this.refs.$br.removeClass('fullscreenActive');\n $(document.body).removeClass('BRfullscreenActive');\n }\n};\n\nBookReader.prototype.isFullscreen = function() {\n return this.isFullscreenActive;\n};\n\n/**\n * Toggles fullscreen\n * @param { boolean } bindKeyboardControls\n */\nBookReader.prototype.toggleFullscreen = function(bindKeyboardControls = true) {\n if (this.isFullscreen()) {\n this.exitFullScreen();\n } else {\n this.enterFullscreen(bindKeyboardControls);\n }\n};\n\n/**\n * Enters fullscreen\n * including:\n * - animation\n * - binds keyboard controls\n * - fires custom event\n * @param { boolean } bindKeyboardControls\n */\nBookReader.prototype.enterFullscreen = function(bindKeyboardControls = true) {\n const currentIndex = this.currentIndex();\n this.refs.$brContainer.css('opacity', 0);\n\n if (bindKeyboardControls) {\n this._fullscreenCloseHandler = (e) => {\n if (e.keyCode === 27) this.toggleFullscreen();\n };\n $(document).keyup(this._fullscreenCloseHandler);\n }\n\n const windowWidth = $(window).width();\n if (windowWidth <= this.onePageMinBreakpoint) {\n this.switchMode(this.constMode1up);\n }\n\n this.isFullscreenActive = true;\n this.updateBrClasses();\n\n this.refs.$brContainer.animate({opacity: 1}, 'fast', 'linear',() => {\n this.resize();\n this.jumpToIndex(currentIndex);\n });\n\n this.textSelectionPlugin?.stopPageFlip(this.refs.$brContainer);\n this.trigger('fullscreenToggled');\n};\n\n/**\n * Exits fullscreen\n * - toggles fullscreen\n * - binds keyboard controls\n * - fires custom event\n * @param { boolean } bindKeyboardControls\n */\nBookReader.prototype.exitFullScreen = function() {\n this.refs.$brContainer.css('opacity', 0);\n\n $(document).unbind('keyup', this._fullscreenCloseHandler);\n\n var windowWidth = $(window).width();\n if (windowWidth <= this.onePageMinBreakpoint) {\n this.switchMode(this.constMode2up);\n }\n\n this.isFullscreenActive = false;\n this.updateBrClasses()\n\n this.resize();\n this.refs.$brContainer.animate({opacity: 1}, 400, 'linear');\n\n this.textSelectionPlugin?.stopPageFlip(this.refs.$brContainer);\n this.trigger('fullscreenToggled');\n};\n\n/**\n * This is called when we switch to one page view\n */\nBookReader.prototype.prepareOnePageView = function() {\n var startLeaf = this.currentIndex();\n\n this.refs.$brContainer.empty();\n this.refs.$brContainer.css({\n overflowY: 'scroll',\n overflowX: 'auto'\n });\n\n this.refs.$brPageViewEl = $(\"\");\n this.refs.$brContainer.append(this.refs.$brPageViewEl);\n\n // Attaches to first child - child must be present\n this.refs.$brContainer.dragscrollable();\n this.bindGestures(this.refs.$brContainer);\n\n // $$$ keep select enabled for now since disabling it breaks keyboard\n // nav in FF 3.6 (https://bugs.edge.launchpad.net/bookreader/+bug/544666)\n // utils.disableSelect(this.$('#BRpageview'));\n\n this.resizePageView1up();\n this.jumpToIndex(startLeaf);\n this.updateBrClasses();\n};\n\nBookReader.prototype.prepareThumbnailView = function() {\n this.refs.$brContainer.empty();\n this.refs.$brContainer.css({\n overflowY: 'scroll',\n overflowX: 'auto'\n });\n\n this.refs.$brPageViewEl = $(\"\");\n this.refs.$brContainer.append(this.refs.$brPageViewEl);\n this.refs.$brContainer.dragscrollable({preventDefault:true});\n\n this.bindGestures(this.refs.$brContainer);\n\n // $$$ keep select enabled for now since disabling it breaks keyboard\n // nav in FF 3.6 (https://bugs.edge.launchpad.net/bookreader/+bug/544666)\n // utils.disableSelect(this.$('#BRpageview'));\n\n this.thumbWidth = this.getThumbnailWidth(this.thumbColumns);\n this.reduce = this._models.book.getPageWidth(0) / this.thumbWidth;\n\n this.displayedRows = [];\n\n // Draw leafs with current index directly in view (no animating to the index)\n this.drawLeafsThumbnail( this.currentIndex() );\n this.updateBrClasses();\n};\n\nBookReader.prototype.onePageGetAutofitWidth = function() {\n var widthPadding = 20;\n return (this._models.book.getMedianPageSize().width + 0.0) / (this.refs.$brContainer.prop('clientWidth') - widthPadding * 2);\n};\n\nBookReader.prototype.onePageGetAutofitHeight = function() {\n var availableHeight = this.refs.$brContainer.innerHeight();\n return (this._models.book.getMedianPageSize().height + 0.0) / (availableHeight - this.padding * 2); // make sure a little of adjacent pages show\n};\n\n/**\n * Returns where the top of the page with given index should be in one page view\n * @param {PageIndex} index\n * @return {number}\n */\nBookReader.prototype.onePageGetPageTop = function(index) {\n const { floor } = Math;\n const { book } = this._models;\n let leafTop = 0;\n for (const page of book.pagesIterator({ end: index, combineConsecutiveUnviewables: true })) {\n leafTop += floor(page.height / this.reduce) + this.padding;\n }\n return leafTop;\n};\n\n/**\n * Update the reduction factors for 1up mode given the available width and height.\n * Recalculates the autofit reduction factors.\n */\nBookReader.prototype.onePageCalculateReductionFactors = function() {\n this.onePage.reductionFactors = this.reductionFactors.concat(\n [\n { reduce: this.onePageGetAutofitWidth(), autofit: 'width' },\n { reduce: this.onePageGetAutofitHeight(), autofit: 'height'}\n ]);\n this.onePage.reductionFactors.sort(this._reduceSort);\n};\n\n/**\n * Returns the currently active index\n * @return {number}\n * @throws\n */\nBookReader.prototype.currentIndex = function() {\n // $$$ we should be cleaner with our idea of which index is active in 1up/2up\n if (this.mode == this.constMode1up || this.mode == this.constModeThumb) {\n return this.firstIndex; // $$$ TODO page in center of view would be better\n } else if (this.mode == this.constMode2up) {\n // Only allow indices that are actually present in book\n return utils.clamp(this.firstIndex, 0, this._models.book.getNumLeafs() - 1);\n } else {\n throw 'currentIndex called for unimplemented mode ' + this.mode;\n }\n};\n\n/**\n * Setter for this.firstIndex\n * Also triggers an event and updates the navbar slider position\n * @param {number} index\n * @param {object} [options]\n * @param {boolean} [options.suppressFragmentChange = false]\n */\nBookReader.prototype.updateFirstIndex = function(\n index,\n { suppressFragmentChange = false } = {}\n) {\n // Called multiple times when defaults contains \"mode/1up\",\n // including after init(). Skip fragment change if no index change\n if (this.firstIndex === index) {\n suppressFragmentChange = true;\n }\n this.firstIndex = index;\n if (!(this.suppressFragmentChange || suppressFragmentChange)) {\n this.trigger(BookReader.eventNames.fragmentChange);\n }\n // If there's an initial search we stop suppressing global URL changes\n // when local suppression ends\n // This seems to correctly handle multiple calls during mode/1up\n if (this.options.initialSearchTerm && !suppressFragmentChange) {\n this.suppressFragmentChange = false;\n }\n this.trigger('pageChanged');\n this.updateNavIndexThrottled(index);\n};\n\n/**\n * Flip the right page over onto the left\n */\nBookReader.prototype.right = function() {\n if ('rl' != this.pageProgression) {\n this.next();\n } else {\n this.prev();\n }\n};\n\n/**\n * Flip to the rightmost page\n */\nBookReader.prototype.rightmost = function() {\n if ('rl' != this.pageProgression) {\n this.last();\n } else {\n this.first();\n }\n};\n\n/**\n * Flip the left page over onto the right\n */\nBookReader.prototype.left = function() {\n if ('rl' != this.pageProgression) {\n this.prev();\n } else {\n this.next();\n }\n};\n\n/**\n * Flip to the leftmost page\n */\nBookReader.prototype.leftmost = function() {\n if ('rl' != this.pageProgression) {\n this.first();\n } else {\n this.last();\n }\n};\n\nBookReader.prototype.next = function() {\n if (this.constMode2up == this.mode) {\n this.trigger(BookReader.eventNames.stop);\n this.flipFwdToIndex(null);\n } else {\n if (this.firstIndex < this.lastDisplayableIndex()) {\n this.jumpToIndex(this.firstIndex + 1);\n }\n }\n};\n\nBookReader.prototype.prev = function() {\n const isOnFrontPage = this.firstIndex < 1;\n if (isOnFrontPage) return;\n\n if (this.constMode2up == this.mode) {\n this.trigger(BookReader.eventNames.stop);\n this.flipBackToIndex(null);\n } else {\n if (this.firstIndex >= 1) {\n this.jumpToIndex(this.firstIndex - 1);\n }\n }\n};\n\nBookReader.prototype.first = function() {\n this.jumpToIndex(this.firstDisplayableIndex());\n};\n\nBookReader.prototype.last = function() {\n this.jumpToIndex(this.lastDisplayableIndex());\n};\n\n/**\n * Scrolls down one screen view\n */\nBookReader.prototype.scrollDown = function() {\n if ($.inArray(this.mode, [this.constMode1up, this.constModeThumb]) >= 0) {\n if ( this.mode == this.constMode1up && (this.reduce >= this.onePageGetAutofitHeight()) ) {\n // Whole pages are visible, scroll whole page only\n return this.next();\n }\n\n this.refs.$brContainer.stop(true).animate(\n { scrollTop: '+=' + this._scrollAmount() + 'px'},\n 400, 'easeInOutExpo'\n );\n return true;\n } else {\n return false;\n }\n};\n\n/**\n * Scrolls up one screen view\n */\nBookReader.prototype.scrollUp = function() {\n if ($.inArray(this.mode, [this.constMode1up, this.constModeThumb]) >= 0) {\n if ( this.mode == this.constMode1up && (this.reduce >= this.onePageGetAutofitHeight()) ) {\n // Whole pages are visible, scroll whole page only\n return this.prev();\n }\n\n this.refs.$brContainer.stop(true).animate(\n { scrollTop: '-=' + this._scrollAmount() + 'px'},\n 400, 'easeInOutExpo'\n );\n return true;\n } else {\n return false;\n }\n};\n\n/**\n * The amount to scroll vertically in integer pixels\n */\nBookReader.prototype._scrollAmount = function() {\n if (this.constMode1up == this.mode) {\n // Overlap by % of page size\n return parseInt(this.refs.$brContainer.prop('clientHeight') - this._models.book.getPageHeight(this.currentIndex()) / this.reduce * 0.03);\n }\n\n return parseInt(0.9 * this.refs.$brContainer.prop('clientHeight'));\n};\n\nBookReader.prototype.prefetchImg = function(index) {\n var pageURI = this._getPageURI(index);\n const pageURISrcset = this._getPageURISrcset(index);\n\n // Load image if not loaded or URI has changed (e.g. due to scaling)\n var loadImage = false;\n if (undefined == this.prefetchedImgs[index]) {\n loadImage = true;\n } else if (pageURI != this.prefetchedImgs[index].uri) {\n loadImage = true;\n }\n\n if (loadImage) {\n const pageContainer = this._createPageContainer(index);\n $('![]()
', {\n 'class': 'BRpageimage',\n src: pageURI,\n srcset: pageURISrcset\n }).appendTo(pageContainer);\n if (index < 0 || index > (this._models.book.getNumLeafs() - 1) ) {\n // Facing page at beginning or end, or beyond\n pageContainer.addClass('BRemptypage');\n }\n pageContainer[0].uri = pageURI; // browser may rewrite src so we stash raw URI here\n this.prefetchedImgs[index] = pageContainer[0];\n }\n};\n\nBookReader.prototype.pruneUnusedImgs = function() {\n for (var key in this.prefetchedImgs) {\n if ((key != this.twoPage.currentIndexL) && (key != this.twoPage.currentIndexR)) {\n $(this.prefetchedImgs[key]).remove();\n }\n if ((key < this.twoPage.currentIndexL - 4) || (key > this.twoPage.currentIndexR + 4)) {\n delete this.prefetchedImgs[key];\n }\n }\n};\n\n/************************/\n/** Mode2Up extensions **/\n/************************/\nBookReader.prototype.zoom2up = Mode2Up.prototype.zoom;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'zoom', 'zoom2up');\nBookReader.prototype.twoPageGetAutofitReduce = Mode2Up.prototype.getAutofitReduce;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'getAutofitReduce', 'twoPageGetAutofitReduce');\nBookReader.prototype.flipBackToIndex = Mode2Up.prototype.flipBackToIndex;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipBackToIndex', 'flipBackToIndex');\nBookReader.prototype.flipFwdToIndex = Mode2Up.prototype.flipFwdToIndex;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipFwdToIndex', 'flipFwdToIndex');\nBookReader.prototype.setHilightCss2UP = Mode2Up.prototype.setHilightCss;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'setHilightCss', 'setHilightCss2UP');\n/** @deprecated not used outside Mode2Up */\nBookReader.prototype.setClickHandler2UP = Mode2Up.prototype.setClickHandler;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'setClickHandler', 'setClickHandler2UP');\n/** @deprecated not used outside Mode2Up */\nBookReader.prototype.drawLeafsTwoPage = Mode2Up.prototype.drawLeafs;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'drawLeafs', 'drawLeafsTwoPage');\n/** @deprecated not used outside BookReader */\nBookReader.prototype.prepareTwoPageView = Mode2Up.prototype.prepareTwoPageView;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'prepareTwoPageView', 'prepareTwoPageView');\n/** @deprecated not used outside Mode2Up */\nBookReader.prototype.prepareTwoPagePopUp = Mode2Up.prototype.preparePopUp;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'preparePopUp', 'prepareTwoPagePopUp');\n/** @deprecated not used outside BookReader, Mode2Up */\nBookReader.prototype.calculateSpreadSize = Mode2Up.prototype.calculateSpreadSize;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'calculateSpreadSize', 'calculateSpreadSize');\n/** @deprecated not used outside BookReader, Mode2Up */\nBookReader.prototype.getIdealSpreadSize = Mode2Up.prototype.getIdealSpreadSize;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'getIdealSpreadSize', 'getIdealSpreadSize');\n/** @deprecated not used outside BookReader, Mode2Up */\nBookReader.prototype.getSpreadSizeFromReduce = Mode2Up.prototype.getSpreadSizeFromReduce;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'getSpreadSizeFromReduce', 'getSpreadSizeFromReduce');\n/** @deprecated unused */\nBookReader.prototype.twoPageIsZoomedIn = Mode2Up.prototype.isZoomedIn;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'isZoomedIn', 'twoPageIsZoomedIn');\n/** @deprecated not used outside BookReader */\nBookReader.prototype.twoPageCalculateReductionFactors = Mode2Up.prototype.calculateReductionFactors;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'calculateReductionFactors', 'twoPageCalculateReductionFactors');\n/** @deprecated unused */\nBookReader.prototype.twoPageSetCursor = Mode2Up.prototype.setCursor;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'setCursor', 'twoPageSetCursor');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.flipLeftToRight = Mode2Up.prototype.flipLeftToRight;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipLeftToRight', 'flipLeftToRight');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.flipRightToLeft = Mode2Up.prototype.flipRightToLeft;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipRightToLeft', 'flipRightToLeft');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.setMouseHandlers2UP = Mode2Up.prototype.setMouseHandlers;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'setMouseHandlers', 'setMouseHandlers2UP');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.prepareFlipLeftToRight = Mode2Up.prototype.prepareFlipLeftToRight;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'prepareFlipLeftToRight', 'prepareFlipLeftToRight');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.prepareFlipRightToLeft = Mode2Up.prototype.prepareFlipRightToLeft;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'prepareFlipRightToLeft', 'prepareFlipRightToLeft');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.getPageWidth2UP = Mode2Up.prototype.getPageWidth;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'getPageWidth', 'getPageWidth2UP');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageGutter = Mode2Up.prototype.gutter;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'gutter', 'twoPageGutter');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageTop = Mode2Up.prototype.top;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'top', 'twoPageTop');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageCoverWidth = Mode2Up.prototype.coverWidth;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'coverWidth', 'twoPageCoverWidth');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageGetViewCenter = Mode2Up.prototype.getViewCenter;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'getViewCenter', 'twoPageGetViewCenter');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.twoPageCenterView = Mode2Up.prototype.centerView;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'centerView', 'twoPageCenterView');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageFlipAreaHeight = Mode2Up.prototype.flipAreaHeight;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipAreaHeight', 'twoPageFlipAreaHeight');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageFlipAreaWidth = Mode2Up.prototype.flipAreaWidth;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipAreaWidth', 'twoPageFlipAreaWidth');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.twoPageFlipAreaTop = Mode2Up.prototype.flipAreaTop;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'flipAreaTop', 'twoPageFlipAreaTop');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageLeftFlipAreaLeft = Mode2Up.prototype.leftFlipAreaLeft;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'leftFlipAreaLeft', 'twoPageLeftFlipAreaLeft');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.twoPageRightFlipAreaLeft = Mode2Up.prototype.rightFlipAreaLeft;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'rightFlipAreaLeft', 'twoPageRightFlipAreaLeft');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.gutterOffsetForIndex = Mode2Up.prototype.gutterOffsetForIndex;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'gutterOffsetForIndex', 'gutterOffsetForIndex');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.leafEdgeWidth = Mode2Up.prototype.leafEdgeWidth;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'leafEdgeWidth', 'leafEdgeWidth');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.jumpIndexForLeftEdgePageX = Mode2Up.prototype.jumpIndexForLeftEdgePageX;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'jumpIndexForLeftEdgePageX', 'jumpIndexForLeftEdgePageX');\n/** @deprecated unused outside BookReader, Mode2Up */\nBookReader.prototype.jumpIndexForRightEdgePageX = Mode2Up.prototype.jumpIndexForRightEdgePageX;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'jumpIndexForRightEdgePageX', 'jumpIndexForRightEdgePageX');\n/** @deprecated unused outside Mode2Up */\nBookReader.prototype.prefetch = Mode2Up.prototype.prefetch;\nexposeOverrideableMethod(Mode2Up, '_modes.mode2Up', 'prefetch', 'prefetch');\n\n/**\n * Immediately stop flip animations. Callbacks are triggered.\n */\nBookReader.prototype.stopFlipAnimations = function() {\n this.trigger(BookReader.eventNames.stop);\n\n // Stop animation, clear queue, trigger callbacks\n if (this.leafEdgeTmp) {\n $(this.leafEdgeTmp).stop(false, true);\n }\n jQuery.each(this.prefetchedImgs, function() {\n $(this).stop(false, true);\n });\n\n // And again since animations also queued in callbacks\n if (this.leafEdgeTmp) {\n $(this.leafEdgeTmp).stop(false, true);\n }\n jQuery.each(this.prefetchedImgs, function() {\n $(this).stop(false, true);\n });\n};\n\n/**\n * Returns true if keyboard navigation should be disabled for the event\n * @param {Event}\n * @return {boolean}\n */\nBookReader.prototype.keyboardNavigationIsDisabled = function(event) {\n return event.target.tagName == \"INPUT\";\n};\n\n/**\n * @template TClass extends { br: BookReader }\n * Helper method to expose a method onto BookReader from a composed class.\n * Only composed classes in BookReader._overridable can be exposed in this\n * way.\n * @param {new () => TClass} Class\n * @param {keyof BookReader['_overrideable']} classKey\n * @param {keyof TClass} method\n * @param {string} [brMethod]\n */\nfunction exposeOverrideableMethod(Class, classKey, method, brMethod = method) {\n /** @type {function(TClass): BookReader} */\n const classToBr = cls => cls.br;\n /** @type {function(BookReader): TClass} */\n const brToClass = br => br._overrideable[classKey];\n exposeOverrideable(Class, method, classToBr, BookReader, brMethod, brToClass);\n}\n\n\n/***********************/\n/** Navbar extensions **/\n/***********************/\nBookReader.prototype.initNavbar = Navbar.prototype.init;\nexposeOverrideableMethod(Navbar, '_components.navbar', 'init', 'initNavbar');\nBookReader.prototype.getNavPageNumString = Navbar.prototype.getNavPageNumString;\nexposeOverrideableMethod(Navbar, '_components.navbar', 'getNavPageNumString');\n/** @deprecated */\nBookReader.prototype.initEmbedNavbar = Navbar.prototype.initEmbed;\nexposeOverrideableMethod(Navbar, '_components.navbar', 'initEmbed', 'initEmbedNavbar');\n/** @deprecated unused */\nBookReader.prototype.getNavPageNumHtml = getNavPageNumHtml;\n/** @deprecated unused outside this file */\nBookReader.prototype.updateNavPageNum = Navbar.prototype.updateNavPageNum;\nexposeOverrideableMethod(Navbar, '_components.navbar', 'updateNavPageNum');\n/** @deprecated unused outside this file */\nBookReader.prototype.updateNavIndex = Navbar.prototype.updateNavIndex;\nexposeOverrideableMethod(Navbar, '_components.navbar', 'updateNavIndex');\n/** @deprecated unused outside this file */\nBookReader.prototype.updateNavIndexThrottled = utils.throttle(BookReader.prototype.updateNavIndex, 250, false);\n/** @deprecated unused */\nBookReader.prototype.updateNavIndexDebounced = utils.debounce(BookReader.prototype.updateNavIndex, 500, false);\n\n\n/************************/\n/** Toolbar extensions **/\n/************************/\nBookReader.prototype.buildToolbarElement = Toolbar.prototype.buildToolbarElement;\nexposeOverrideableMethod(Toolbar, '_components.toolbar', 'buildToolbarElement');\nBookReader.prototype.initToolbar = Toolbar.prototype.initToolbar;\nexposeOverrideableMethod(Toolbar, '_components.toolbar', 'initToolbar');\nBookReader.prototype.buildShareDiv = Toolbar.prototype.buildShareDiv;\nexposeOverrideableMethod(Toolbar, '_components.toolbar', 'buildShareDiv');\nBookReader.prototype.buildInfoDiv = Toolbar.prototype.buildInfoDiv;\nexposeOverrideableMethod(Toolbar, '_components.toolbar', 'buildInfoDiv');\nBookReader.prototype.getToolBarHeight = Toolbar.prototype.getToolBarHeight;\nexposeOverrideableMethod(Toolbar, '_components.toolbar', 'getToolBarHeight');\n/** @deprecated zoom no longer in toolbar */\nBookReader.prototype.updateToolbarZoom = Toolbar.prototype.updateToolbarZoom;\nexposeOverrideableMethod(Toolbar, '_components.toolbar', 'updateToolbarZoom');\n/** @deprecated unused */\nBookReader.prototype.blankInfoDiv = blankInfoDiv;\n/** @deprecated unused */\nBookReader.prototype.blankShareDiv = blankShareDiv;\n/** @deprecated unused */\nBookReader.prototype.createPopup = createPopup;\n\n/**\n * Bind navigation handlers\n */\nBookReader.prototype.bindNavigationHandlers = function() {\n const self = this;\n\n // Note the mobile plugin attaches itself to body, so we need to select outside\n const jIcons = this.$('.BRicon').add('.BRmobileMenu .BRicon');\n // Map of jIcon class -> click handler\n const navigationControls = {\n book_left: () => {\n this.trigger(BookReader.eventNames.stop);\n this.left();\n },\n book_right: () => {\n this.trigger(BookReader.eventNames.stop);\n this.right();\n },\n book_up: () => {\n if ($.inArray(this.mode, [this.constMode1up, this.constModeThumb]) >= 0) {\n this.scrollUp();\n } else {\n this.prev();\n }\n },\n book_down: () => {\n if ($.inArray(this.mode, [this.constMode1up, this.constModeThumb]) >= 0) {\n this.scrollDown();\n } else {\n this.next();\n }\n },\n book_top: this.first.bind(this),\n book_bottom: this.last.bind(this),\n book_leftmost: this.leftmost.bind(this),\n book_rightmost: this.rightmost.bind(this),\n onepg: () => {\n this.switchMode(self.constMode1up);\n },\n thumb: () => {\n this.switchMode(self.constModeThumb);\n },\n twopg: () => {\n this.switchMode(self.constMode2up);\n },\n zoom_in: () => {\n this.trigger(BookReader.eventNames.stop);\n this.zoom(1);\n this.trigger(BookReader.eventNames.zoomIn);\n },\n zoom_out: () => {\n this.trigger(BookReader.eventNames.stop);\n this.zoom(-1);\n this.trigger(BookReader.eventNames.zoomOut);\n },\n full: () => {\n if (this.ui == 'embed') {\n var url = this.$('.BRembedreturn a').attr('href');\n window.open(url);\n } else {\n this.toggleFullscreen();\n }\n },\n };\n\n jIcons.filter('.fit').bind('fit', function() {\n // XXXmang implement autofit zoom\n });\n\n for (const control in navigationControls) {\n jIcons.filter(`.${control}`).on('click.bindNavigationHandlers', () => {\n navigationControls[control]()\n return false;\n });\n }\n\n var $brNavCntlBtmEl = this.$('.BRnavCntlBtm');\n var $brNavCntlTopEl = this.$('.BRnavCntlTop');\n\n this.$('.BRnavCntl').click(\n function() {\n var promises = [];\n // TODO don't use magic constants\n // TODO move this to a function\n if ($brNavCntlBtmEl.hasClass('BRdn')) {\n if (self.refs.$BRtoolbar)\n promises.push(self.refs.$BRtoolbar.animate(\n {top: self.getToolBarHeight() * -1}\n ).promise());\n promises.push(self.$('.BRfooter').animate({bottom: self.getFooterHeight() * -1}).promise());\n $brNavCntlBtmEl.addClass('BRup').removeClass('BRdn');\n $brNavCntlTopEl.addClass('BRdn').removeClass('BRup');\n self.$('.BRnavCntlBtm.BRnavCntl').animate({height:'45px'});\n self.$('.BRnavCntl').delay(1000).animate({opacity:.75}, 1000);\n } else {\n if (self.refs.$BRtoolbar)\n promises.push(self.refs.$BRtoolbar.animate({top:0}).promise());\n promises.push(self.$('.BRfooter').animate({bottom:0}).promise());\n $brNavCntlBtmEl.addClass('BRdn').removeClass('BRup');\n $brNavCntlTopEl.addClass('BRup').removeClass('BRdn');\n self.$('.BRnavCntlBtm.BRnavCntl').animate({height:'30px'});\n self.$('.BRvavCntl').animate({opacity:1})\n }\n $.when.apply($, promises).done(function() {\n // Only do full resize in auto mode and need to recalc. size\n if (self.mode == self.constMode2up && self.twoPage.autofit != null\n && self.twoPage.autofit != 'none'\n ) {\n self.resize();\n } else if (self.mode == self.constMode1up && self.onePage.autofit != null\n && self.onePage.autofit != 'none') {\n self.resize();\n } else {\n // Don't do a full resize to avoid redrawing images\n self.resizeBRcontainer();\n }\n });\n }\n );\n $brNavCntlBtmEl.mouseover(function() {\n if ($(this).hasClass('BRup')) {\n self.$('.BRnavCntl').animate({opacity:1},250);\n }\n }).mouseleave(function() {\n if ($(this).hasClass('BRup')) {\n self.$('.BRnavCntl').animate({opacity:.75},250);\n }\n });\n $brNavCntlTopEl.mouseover(function() {\n if ($(this).hasClass('BRdn')) {\n self.$('.BRnavCntl').animate({opacity:1},250);\n }\n }).mouseleave(function() {\n if ($(this).hasClass('BRdn')) {\n self.$('.BRnavCntl').animate({opacity:.75},250);\n }\n });\n\n this.initSwipeData();\n\n $(document).off('mousemove.navigation', this.el);\n $(document).on(\n 'mousemove.navigation',\n this.el,\n { 'br': this },\n this.navigationMousemoveHandler\n );\n\n $(document).off('mousedown.swipe', '.BRpageimage');\n $(document).on(\n 'mousedown.swipe',\n '.BRpageimage',\n { 'br': this },\n this.swipeMousedownHandler\n );\n\n this.bindMozTouchHandlers();\n};\n\n/**\n * Unbind navigation handlers\n */\nBookReader.prototype.unbindNavigationHandlers = function() {\n $(document).off('mousemove.navigation', this.el);\n};\n\n/**\n * Handle mousemove related to navigation. Bind at #BookReader level to allow autohide.\n */\nBookReader.prototype.navigationMousemoveHandler = function(event) {\n // $$$ possibly not great to be calling this for every mousemove\n if (event.data['br'].uiAutoHide) {\n // 77px is an approximate height of the Internet Archive Top Nav\n // 75 & 76 (pixels) provide used in this context is checked againt the IA top nav height\n var navkey = $(document).height() - 75;\n if ((event.pageY < 76) || (event.pageY > navkey)) {\n // inside or near navigation elements\n event.data['br'].hideNavigation();\n } else {\n event.data['br'].showNavigation();\n }\n }\n};\n\nBookReader.prototype.initSwipeData = function(clientX, clientY) {\n /*\n * Based on the really quite awesome \"Today's Guardian\" at http://guardian.gyford.com/\n */\n this._swipe = {\n mightBeSwiping: false,\n didSwipe: false,\n mightBeDraggin: false,\n didDrag: false,\n startTime: (new Date).getTime(),\n startX: clientX,\n startY: clientY,\n lastX: clientX,\n lastY: clientY,\n deltaX: 0,\n deltaY: 0,\n deltaT: 0\n }\n};\n\nBookReader.prototype.swipeMousedownHandler = function(event) {\n var self = event.data['br'];\n\n // We should be the last bubble point for the page images\n // Disable image drag and select, but keep right-click\n if (event.which == 3) {\n return !self.protected;\n }\n\n $(event.target).bind('mouseout.swipe',\n { 'br': self},\n self.swipeMouseupHandler\n ).bind('mouseup.swipe',\n { 'br': self},\n self.swipeMouseupHandler\n ).bind('mousemove.swipe',\n { 'br': self },\n self.swipeMousemoveHandler\n );\n\n self.initSwipeData(event.clientX, event.clientY);\n self._swipe.mightBeSwiping = true;\n self._swipe.mightBeDragging = true;\n\n event.preventDefault();\n event.returnValue = false;\n event.cancelBubble = true;\n return false;\n};\n\nBookReader.prototype.swipeMousemoveHandler = function(event) {\n var self = event.data['br'];\n var _swipe = self._swipe;\n if (! _swipe.mightBeSwiping) {\n return;\n }\n\n // Update swipe data\n _swipe.deltaX = event.clientX - _swipe.startX;\n _swipe.deltaY = event.clientY - _swipe.startY;\n _swipe.deltaT = (new Date).getTime() - _swipe.startTime;\n\n var absX = Math.abs(_swipe.deltaX);\n var absY = Math.abs(_swipe.deltaY);\n\n // Minimum distance in the amount of tim to trigger the swipe\n var minSwipeLength = Math.min(self.refs.$br.width() / 5, 80);\n var maxSwipeTime = 400;\n\n // Check for horizontal swipe\n if (absX > absY && (absX > minSwipeLength) && _swipe.deltaT < maxSwipeTime) {\n _swipe.mightBeSwiping = false; // only trigger once\n _swipe.didSwipe = true;\n if (self.mode == self.constMode2up) {\n if (_swipe.deltaX < 0) {\n self.right();\n } else {\n self.left();\n }\n }\n }\n\n if ( _swipe.deltaT > maxSwipeTime && !_swipe.didSwipe) {\n if (_swipe.mightBeDragging) {\n // Dragging\n _swipe.didDrag = true;\n self.refs.$brContainer\n .scrollTop(self.refs.$brContainer.scrollTop() - event.clientY + _swipe.lastY)\n .scrollLeft(self.refs.$brContainer.scrollLeft() - event.clientX + _swipe.lastX);\n }\n }\n _swipe.lastX = event.clientX;\n _swipe.lastY = event.clientY;\n\n event.preventDefault();\n event.returnValue = false;\n event.cancelBubble = true;\n return false;\n};\n\nBookReader.prototype.swipeMouseupHandler = function(event) {\n var _swipe = event.data['br']._swipe;\n _swipe.mightBeSwiping = false;\n _swipe.mightBeDragging = false;\n\n $(event.target).unbind('mouseout.swipe').unbind('mouseup.swipe').unbind('mousemove.swipe');\n\n if (_swipe.didSwipe || _swipe.didDrag) {\n // Swallow event if completed swipe gesture\n event.preventDefault();\n event.returnValue = false;\n event.cancelBubble = true;\n return false;\n }\n return true;\n};\n\nBookReader.prototype.bindMozTouchHandlers = function() {\n var self = this;\n\n // Currently only want touch handlers in 2up\n this.refs.$br.bind('MozTouchDown', function(event) {\n if (this.mode == self.constMode2up) {\n event.preventDefault();\n }\n })\n .bind('MozTouchMove', function(event) {\n if (this.mode == self.constMode2up) {\n event.preventDefault();\n }\n })\n .bind('MozTouchUp', function(event) {\n if (this.mode == self.constMode2up) {\n event.preventDefault();\n }\n });\n};\n\n/**\n * Returns true if the navigation elements are currently visible\n * @return {boolean}\n */\nBookReader.prototype.navigationIsVisible = function() {\n // $$$ doesn't account for transitioning states, nav must be fully visible to return true\n var toolpos = this.refs.$BRtoolbar.position();\n var tooltop = toolpos.top;\n return tooltop == 0;\n};\n\n/**\n * Main controller that sets navigation into view.\n * Defaults to SHOW the navigation chrome\n */\nBookReader.prototype.setNavigationView = function brSetNavigationView(hide) {\n var animationLength = this.constNavAnimationDuration;\n var animationType = 'linear';\n var resizePageContainer = function resizePageContainer () {\n /* main page container fills whole container */\n if (this.constMode2up !== this.mode) {\n var animate = true;\n this.resizeBRcontainer(animate);\n }\n this.trigger(BookReader.eventNames.navToggled);\n }.bind(this);\n\n var toolbarHeight = 0;\n var navbarHeight = 0;\n if (hide) {\n toolbarHeight = this.getToolBarHeight() * -1;\n navbarHeight = this.getFooterHeight() * -1;\n\n this.refs.$BRtoolbar.addClass('js-menu-hide');\n this.refs.$BRfooter.addClass('js-menu-hide');\n } else {\n this.refs.$BRtoolbar.removeClass('js-menu-hide');\n this.refs.$BRfooter.removeClass('js-menu-hide');\n }\n\n this.refs.$BRtoolbar.animate(\n { top: toolbarHeight },\n animationLength,\n animationType,\n resizePageContainer\n );\n this.refs.$BRfooter.animate(\n { bottom: navbarHeight },\n animationLength,\n animationType,\n resizePageContainer\n );\n};\n/**\n * Hide navigation elements, if visible\n */\nBookReader.prototype.hideNavigation = function() {\n // Check if navigation is showing\n if (this.navigationIsVisible()) {\n var hide = true;\n this.setNavigationView(hide);\n }\n};\n\n/**\n * Show navigation elements\n */\nBookReader.prototype.showNavigation = function() {\n // Check if navigation is hidden\n if (!this.navigationIsVisible()) {\n this.setNavigationView();\n }\n};\n\n/**\n * Returns the index of the first visible page, dependent on the mode.\n * $$$ Currently we cannot display the front/back cover in 2-up and will need to update\n * this function when we can as part of https://bugs.launchpad.net/gnubook/+bug/296788\n * @return {number}\n */\nBookReader.prototype.firstDisplayableIndex = function() {\n if (this.mode != this.constMode2up) {\n return 0;\n }\n\n if ('rl' != this.pageProgression) {\n // LTR\n if (this._models.book.getPageSide(0) == 'L') {\n return 0;\n } else {\n return -1;\n }\n } else {\n // RTL\n if (this._models.book.getPageSide(0) == 'R') {\n return 0;\n } else {\n return -1;\n }\n }\n};\n\n/**\n * Returns the index of the last visible page, dependent on the mode.\n * $$$ Currently we cannot display the front/back cover in 2-up and will need to update\n * this function when we can as part of https://bugs.launchpad.net/gnubook/+bug/296788\n * @return {number}\n */\nBookReader.prototype.lastDisplayableIndex = function() {\n\n var lastIndex = this._models.book.getNumLeafs() - 1;\n\n if (this.mode != this.constMode2up) {\n return lastIndex;\n }\n\n if ('rl' != this.pageProgression) {\n // LTR\n if (this._models.book.getPageSide(lastIndex) == 'R') {\n return lastIndex;\n } else {\n return lastIndex + 1;\n }\n } else {\n // RTL\n if (this._models.book.getPageSide(lastIndex) == 'L') {\n return lastIndex;\n } else {\n return lastIndex + 1;\n }\n }\n};\n\n\n/**************************/\n/** BookModel extensions **/\n/**************************/\n/** @deprecated not used outside */\nBookReader.prototype.getMedianPageSize = BookModel.prototype.getMedianPageSize;\nexposeOverrideableMethod(BookModel, '_models.book', 'getMedianPageSize');\nBookReader.prototype._getPageWidth = BookModel.prototype._getPageWidth;\nexposeOverrideableMethod(BookModel, '_models.book', '_getPageWidth');\nBookReader.prototype._getPageHeight = BookModel.prototype._getPageHeight;\nexposeOverrideableMethod(BookModel, '_models.book', '_getPageHeight');\nBookReader.prototype.getPageIndex = BookModel.prototype.getPageIndex;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageIndex');\n/** @deprecated not used outside */\nBookReader.prototype.getPageIndices = BookModel.prototype.getPageIndices;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageIndices');\nBookReader.prototype.getPageName = BookModel.prototype.getPageName;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageName');\nBookReader.prototype.getNumLeafs = BookModel.prototype.getNumLeafs;\nexposeOverrideableMethod(BookModel, '_models.book', 'getNumLeafs');\nBookReader.prototype.getPageWidth = BookModel.prototype.getPageWidth;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageWidth');\nBookReader.prototype.getPageHeight = BookModel.prototype.getPageHeight;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageHeight');\nBookReader.prototype.getPageURI = BookModel.prototype.getPageURI;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageURI');\nBookReader.prototype.getPageSide = BookModel.prototype.getPageSide;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageSide');\nBookReader.prototype.getPageNum = BookModel.prototype.getPageNum;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageNum');\nBookReader.prototype.getPageProp = BookModel.prototype.getPageProp;\nexposeOverrideableMethod(BookModel, '_models.book', 'getPageProp');\nBookReader.prototype.getSpreadIndices = BookModel.prototype.getSpreadIndices;\nexposeOverrideableMethod(BookModel, '_models.book', 'getSpreadIndices');\nBookReader.prototype.leafNumToIndex = BookModel.prototype.leafNumToIndex;\nexposeOverrideableMethod(BookModel, '_models.book', 'leafNumToIndex');\nBookReader.prototype.parsePageString = BookModel.prototype.parsePageString;\nexposeOverrideableMethod(BookModel, '_models.book', 'parsePageString');\n/** @deprecated unused */\nBookReader.prototype._getDataFlattened = BookModel.prototype._getDataFlattened;\nexposeOverrideableMethod(BookModel, '_models.book', '_getDataFlattened');\n/** @deprecated unused */\nBookReader.prototype._getDataProp = BookModel.prototype._getDataProp;\nexposeOverrideableMethod(BookModel, '_models.book', '_getDataProp');\n\n// Parameter related functions\n\n/**\n * Update from the params object\n * @param {Object}\n */\nBookReader.prototype.updateFromParams = function(params) {\n // Set init, fragment change options for switchMode()\n const {\n mode = 0,\n init = false,\n fragmentChange = false,\n } = params;\n\n if (mode) {\n this.switchMode(\n mode,\n { init: init, suppressFragmentChange: !fragmentChange }\n );\n }\n\n // $$$ process /zoom\n // We only respect page if index is not set\n if ('undefined' != typeof(params.index)) {\n if (params.index != this.currentIndex()) {\n this.jumpToIndex(params.index);\n }\n } else if ('undefined' != typeof(params.page)) {\n // $$$ this assumes page numbers are unique\n if (params.page != this._models.book.getPageNum(this.currentIndex())) {\n this.jumpToPage(params.page);\n }\n }\n\n\n // process /search\n // @deprecated for urlMode 'history'\n // Continues to work for urlMode 'hash'\n if (this.enableSearch && 'undefined' != typeof(params.search)) {\n if (this.searchTerm !== params.search) {\n this.$('.BRsearchInput').val(params.search);\n }\n }\n\n // $$$ process /region\n // $$$ process /highlight\n\n // $$$ process /theme\n if (this.enableThemesPlugin && 'undefined' != typeof(params.theme)) {\n this.updateTheme(params.theme);\n }\n};\n\n/**\n * Returns true if we can switch to the requested mode\n * @param {number} mode\n * @return {boolean}\n */\nBookReader.prototype.canSwitchToMode = function(mode) {\n if (mode == this.constMode2up || mode == this.constModeThumb) {\n // check there are enough pages to display\n // $$$ this is a workaround for the mis-feature that we can't display\n // short books in 2up mode\n if (this._models.book.getNumLeafs() < 2) {\n return false;\n }\n }\n\n return true;\n};\n\n\n/**\n * Returns the srcset with correct URIs or void string if out of range\n * Also makes the reduce argument optional\n * @param {number} index\n * @param {number} [reduce]\n * @param {number} [rotate]\n * @return {string}\n */\nBookReader.prototype._getPageURISrcset = function(index, reduce, rotate) {\n if (index < 0 || index >= this._models.book.getNumLeafs()) { // Synthesize page\n return \"\";\n }\n\n let ratio = reduce;\n if ('undefined' == typeof(reduce)) {\n // reduce not passed in\n // $$$ this probably won't work for thumbnail mode\n ratio = this._models.book.getPageHeight(index) / this.twoPage.height;\n }\n let scale = [16,8,4,2,1];\n // $$$ we make an assumption here that the scales are available pow2 (like kakadu)\n if (ratio < 2) {\n return \"\";\n } else if (ratio < 4) {\n scale = [1];\n } else if (ratio < 8) {\n scale = [2,1];\n } else if (ratio < 16) {\n scale = [4,2,1];\n } else if (ratio < 32) {\n scale = [8,4,2,1];\n }\n return scale.map((el, i) => (\n this._models.book.getPageURI(index, scale[i], rotate) + \" \"\n + Math.pow(2, i + 1) + \"x\"\n )).join(', ');\n}\n\n\n/**\n * Returns the page URI or transparent image if out of range\n * Also makes the reduce argument optional\n * @param {number} index\n * @param {number} [reduce]\n * @param {number} [rotate]\n * @return {string}\n */\nBookReader.prototype._getPageURI = function(index, reduce, rotate) {\n if (index < 0 || index >= this._models.book.getNumLeafs()) { // Synthesize page\n return this.imagesBaseURL + \"transparent.png\";\n }\n\n if ('undefined' == typeof(reduce)) {\n // reduce not passed in\n // $$$ this probably won't work for thumbnail mode\n var ratio = this._models.book.getPageHeight(index) / this.twoPage.height;\n var scale;\n // $$$ we make an assumption here that the scales are available pow2 (like kakadu)\n if (ratio < 2) {\n scale = 1;\n } else if (ratio < 4) {\n scale = 2;\n } else if (ratio < 8) {\n scale = 4;\n } else if (ratio < 16) {\n scale = 8;\n } else if (ratio < 32) {\n scale = 16;\n } else {\n scale = 32;\n }\n reduce = scale;\n }\n\n return this._models.book.getPageURI(index, reduce, rotate);\n};\n\n/**\n * @param {string}\n */\nBookReader.prototype.showProgressPopup = function(msg) {\n if (this.popup) return;\n\n this.popup = document.createElement(\"div\");\n $(this.popup).prop('className', 'BRprogresspopup');\n var bar = document.createElement(\"div\");\n $(bar).css({\n height: '20px'\n }).prop('className', 'BRprogressbar');\n $(this.popup).append(bar);\n\n if (msg) {\n var msgdiv = document.createElement(\"div\");\n msgdiv.innerHTML = msg;\n $(this.popup).append(msgdiv);\n }\n\n $(this.popup).appendTo(this.refs.$br);\n};\n\nBookReader.prototype.removeProgressPopup = function() {\n $(this.popup).remove();\n this.$('.BRprogresspopup').remove();\n this.popup = null;\n};\n\n/**\n * Can be overriden\n */\nBookReader.prototype.initUIStrings = function() {\n // Navigation handlers will be bound after all UI is in place -- makes moving icons between\n // the toolbar and nav bar easier\n\n // Setup tooltips -- later we could load these from a file for i18n\n var titles = {\n '.logo': 'Go to Archive.org', // $$$ update after getting OL record\n '.zoom_in': 'Zoom in',\n '.zoom_out': 'Zoom out',\n '.onepg': 'One-page view',\n '.twopg': 'Two-page view',\n '.thumb': 'Thumbnail view',\n '.print': 'Print this page',\n '.embed': 'Embed BookReader',\n '.link': 'Link to this book (and page)',\n '.bookmark': 'Bookmark this page',\n '.share': 'Share this book',\n '.info': 'About this book',\n '.full': 'Toggle fullscreen',\n '.book_left': 'Flip left',\n '.book_right': 'Flip right',\n '.book_up': 'Page up',\n '.book_down': 'Page down',\n '.play': 'Play',\n '.pause': 'Pause',\n '.BRdn': 'Show/hide nav bar', // Would have to keep updating on state change to have just \"Hide nav bar\"\n '.BRup': 'Show/hide nav bar',\n '.book_top': 'First page',\n '.book_bottom': 'Last page',\n '.book_leftmost': 'First page',\n '.book_rightmost': 'Last page',\n };\n if ('rl' == this.pageProgression) {\n titles['.book_leftmost'] = 'Last page';\n titles['.book_rightmost'] = 'First page';\n }\n\n for (var icon in titles) {\n this.$(icon).prop('title', titles[icon]);\n }\n}\n\n/**\n * Reloads images. Useful when some images might have failed.\n */\nBookReader.prototype.reloadImages = function() {\n this.refs.$brContainer.find('img').each(function(index, elem) {\n if (!elem.complete || elem.naturalHeight === 0) {\n var src = elem.src;\n elem.src = '';\n setTimeout(function() {\n elem.src = src;\n }, 1000);\n }\n });\n};\n\n/**\n * @param {boolean} ignoreDisplay - bypass the display check\n * @return {number}\n */\nBookReader.prototype.getFooterHeight = function() {\n var $heightEl = this.mode == this.constMode2up ? this.refs.$BRfooter : this.refs.$BRnav;\n if ($heightEl && this.refs.$BRfooter) {\n var outerHeight = $heightEl.outerHeight();\n var bottom = parseInt(this.refs.$BRfooter.css('bottom'));\n if (!isNaN(outerHeight) && !isNaN(bottom)) {\n return outerHeight + bottom;\n }\n }\n return 0;\n}\n\n// Basic Usage built-in Methods (can be overridden through options)\n// This implementation uses options.data value for populating BookReader\n\n/**\n * Create a params object from the current parameters.\n * @return {Object}\n */\nBookReader.prototype.paramsFromCurrent = function() {\n var params = {};\n\n var index = this.currentIndex();\n var pageNum = this._models.book.getPageNum(index);\n if ((pageNum === 0) || pageNum) {\n params.page = pageNum;\n }\n\n params.index = index;\n params.mode = this.mode;\n\n // $$$ highlight\n // $$$ region\n\n // search\n if (this.enableSearch) {\n params.search = this.searchTerm;\n }\n\n return params;\n};\n\n/**\n * Return an object with configuration parameters from a fragment string.\n *\n * Fragments are formatted as a URL path but may be used outside of URLs as a\n * serialization format for BookReader parameters\n *\n * @see http://openlibrary.org/dev/docs/bookurls for fragment syntax\n *\n * @param {string} fragment initial # is allowed for backwards compatibility\n * but is deprecated\n * @return {Object}\n */\nBookReader.prototype.paramsFromFragment = function(fragment) {\n var params = {};\n\n // For backwards compatibility we allow an initial # character\n // (as from window.location.hash) but don't require it\n if (fragment.substr(0, 1) == '#') {\n fragment = fragment.substr(1);\n }\n\n // Simple #nn syntax\n var oldStyleLeafNum = parseInt( /^\\d+$/.exec(fragment) );\n if ( !isNaN(oldStyleLeafNum) ) {\n params.index = oldStyleLeafNum;\n\n // Done processing if using old-style syntax\n return params;\n }\n\n // Split into key-value pairs\n var urlArray = fragment.split('/');\n var urlHash = {};\n for (var i = 0; i < urlArray.length; i += 2) {\n urlHash[urlArray[i]] = urlArray[i + 1];\n }\n\n // Mode\n if ('1up' == urlHash['mode']) {\n params.mode = this.constMode1up;\n } else if ('2up' == urlHash['mode']) {\n params.mode = this.constMode2up;\n } else if ('thumb' == urlHash['mode']) {\n params.mode = this.constModeThumb;\n }\n\n // Index and page\n if ('undefined' != typeof(urlHash['page'])) {\n // page was set -- may not be int\n params.page = urlHash['page'];\n }\n\n // $$$ process /region\n // $$$ process /search\n\n if (urlHash['search'] != undefined) {\n params.search = utils.decodeURIComponentPlus(urlHash['search']);\n }\n\n // $$$ process /highlight\n\n // $$$ process /theme\n if (urlHash['theme'] != undefined) {\n params.theme = urlHash['theme']\n }\n return params;\n};\n\n/**\n * Create a fragment string from the params object.\n *\n * Fragments are formatted as a URL path but may be used outside of URLs as a\n * serialization format for BookReader parameters\n *\n * @see https://openlibrary.org/dev/docs/bookurls for fragment syntax\n *\n * @param {Object} params\n * @param {string} [urlMode]\n * @return {string}\n */\nBookReader.prototype.fragmentFromParams = function(params, urlMode = 'hash') {\n const separator = '/';\n const fragments = [];\n\n if ('undefined' != typeof(params.page)) {\n fragments.push('page', params.page);\n } else {\n if ('undefined' != typeof(params.index)) {\n // Don't have page numbering but we do have the index\n fragments.push('page', 'n' + params.index);\n }\n }\n\n // $$$ highlight\n // $$$ region\n\n // mode\n if ('undefined' != typeof(params.mode)) {\n if (params.mode == this.constMode1up) {\n fragments.push('mode', '1up');\n } else if (params.mode == this.constMode2up) {\n fragments.push('mode', '2up');\n } else if (params.mode == this.constModeThumb) {\n fragments.push('mode', 'thumb');\n } else {\n throw 'fragmentFromParams called with unknown mode ' + params.mode;\n }\n }\n\n // search\n if (params.search && urlMode === 'hash') {\n fragments.push('search', params.search);\n }\n\n return utils.encodeURIComponentPlus(fragments.join(separator)).replace(/%2F/g, '/');\n};\n\n/**\n * Create, update querystring from the params object\n *\n * @param {Object} params\n * @param {string} currQueryString\n * @param {string} [urlMode]\n * @return {string}\n */\nBookReader.prototype.queryStringFromParams = function(\n params,\n currQueryString,\n urlMode = 'hash'\n) {\n const newParams = new URLSearchParams(currQueryString);\n if (params.search && urlMode === 'history') {\n newParams.set('q', params.search)\n }\n // https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/toString\n // Note: This method returns the query string without the question mark.\n const result = newParams.toString();\n return result ? '?' + result : '';\n}\n\n/**\n * Helper to select within instance's elements\n */\nBookReader.prototype.$ = function(selector) {\n return this.refs.$br.find(selector);\n}\n\n/**\n * Polyfill for deprecated method\n */\njQuery.curCSS = function(element, prop, val) {\n return jQuery(element).css(prop, val);\n};\n\nwindow.BookReader = BookReader;\n","/**\n * Displays a console on the document for debugging devices where remote\n * debugging is not feasible, and forwards all console.log's to be displayed\n * on screen.\n */\nexport class DebugConsole {\n constructor() {\n /** How many times we've seen the same line in a row */\n this.currentRun = 0;\n }\n\n init() {\n this.$log = $(``);\n $(document.body).prepend(this.$log);\n\n this.$form = $(`\n `);\n this.$log.append(this.$form);\n\n this.$form.submit(ev => {\n ev.preventDefault();\n const result = eval(this.$form.find('input').val());\n this.logToScreen([result]);\n });\n\n const _realLog = console.log.bind(console);\n console.log = (...args) => {\n _realLog(...args);\n this.logToScreen(args);\n }\n\n window.onerror = (...args) => this.logToScreen(args);\n }\n\n /**\n * Log the provided array onto the on screen console\n * @param {Array} args\n */\n logToScreen(args) {\n const html = args.map(JSON.stringify).join(',');\n const $lastEntry = this.$log.children('.log-entry:last-child')\n if ($lastEntry.find('.entry-code').html() == html) {\n $lastEntry.find('.count').text(`(${++this.currentRun})`);\n } else {\n this.currentRun = 1;\n this.$log.append($(`\n state to , but guard against overflow.\n var handledCPCountPlusOne = handledCPCount + 1;\n if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {\n throw RangeError(OVERFLOW_ERROR);\n }\n\n delta += (m - n) * handledCPCountPlusOne;\n n = m;\n\n for (i = 0; i < input.length; i++) {\n currentValue = input[i];\n if (currentValue < n && ++delta > maxInt) {\n throw RangeError(OVERFLOW_ERROR);\n }\n if (currentValue == n) {\n // Represent delta as a generalized variable-length integer.\n var q = delta;\n for (var k = base; /* no condition */; k += base) {\n var t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);\n if (q < t) break;\n var qMinusT = q - t;\n var baseMinusT = base - t;\n output.push(stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT)));\n q = floor(qMinusT / baseMinusT);\n }\n\n output.push(stringFromCharCode(digitToBasic(q)));\n bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);\n delta = 0;\n ++handledCPCount;\n }\n }\n\n ++delta;\n ++n;\n }\n return output.join('');\n};\n\nmodule.exports = function (input) {\n var encoded = [];\n var labels = input.toLowerCase().replace(regexSeparators, '\\u002E').split('.');\n var i, label;\n for (i = 0; i < labels.length; i++) {\n label = labels[i];\n encoded.push(regexNonASCII.test(label) ? 'xn--' + encode(label) : label);\n }\n return encoded.join('.');\n};\n","'use strict';\nvar toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\n\n// `String.prototype.repeat` method implementation\n// https://tc39.github.io/ecma262/#sec-string.prototype.repeat\nmodule.exports = ''.repeat || function repeat(count) {\n var str = String(requireObjectCoercible(this));\n var result = '';\n var n = toInteger(count);\n if (n < 0 || n == Infinity) throw RangeError('Wrong number of repetitions');\n for (;n > 0; (n >>>= 1) && (str += str)) if (n & 1) result += str;\n return result;\n};\n","var classof = require('../internals/classof-raw');\n\n// `thisNumberValue` abstract operation\n// https://tc39.github.io/ecma262/#sec-thisnumbervalue\nmodule.exports = function (value) {\n if (typeof value != 'number' && classof(value) != 'Number') {\n throw TypeError('Incorrect invocation');\n }\n return +value;\n};\n","var toInteger = require('../internals/to-integer');\n\nvar max = Math.max;\nvar min = Math.min;\n\n// Helper for a popular repeating case of the spec:\n// Let integer be ? ToInteger(index).\n// If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).\nmodule.exports = function (index, length) {\n var integer = toInteger(index);\n return integer < 0 ? max(integer + length, 0) : min(integer, length);\n};\n","// toObject with fallback for non-array-like ES3 strings\nvar IndexedObject = require('../internals/indexed-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\n\nmodule.exports = function (it) {\n return IndexedObject(requireObjectCoercible(it));\n};\n","var ceil = Math.ceil;\nvar floor = Math.floor;\n\n// `ToInteger` abstract operation\n// https://tc39.github.io/ecma262/#sec-tointeger\nmodule.exports = function (argument) {\n return isNaN(argument = +argument) ? 0 : (argument > 0 ? floor : ceil)(argument);\n};\n","var toInteger = require('../internals/to-integer');\n\nvar min = Math.min;\n\n// `ToLength` abstract operation\n// https://tc39.github.io/ecma262/#sec-tolength\nmodule.exports = function (argument) {\n return argument > 0 ? min(toInteger(argument), 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991\n};\n","var requireObjectCoercible = require('../internals/require-object-coercible');\n\n// `ToObject` abstract operation\n// https://tc39.github.io/ecma262/#sec-toobject\nmodule.exports = function (argument) {\n return Object(requireObjectCoercible(argument));\n};\n","var isObject = require('../internals/is-object');\n\n// `ToPrimitive` abstract operation\n// https://tc39.github.io/ecma262/#sec-toprimitive\n// instead of the ES6 spec version, we didn't implement @@toPrimitive case\n// and the second argument - flag - preferred type is a string\nmodule.exports = function (input, PREFERRED_STRING) {\n if (!isObject(input)) return input;\n var fn, val;\n if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;\n if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;\n if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;\n throw TypeError(\"Can't convert object to primitive value\");\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\nvar test = {};\n\ntest[TO_STRING_TAG] = 'z';\n\nmodule.exports = String(test) === '[object z]';\n","var id = 0;\nvar postfix = Math.random();\n\nmodule.exports = function (key) {\n return 'Symbol(' + String(key === undefined ? '' : key) + ')_' + (++id + postfix).toString(36);\n};\n","var NATIVE_SYMBOL = require('../internals/native-symbol');\n\nmodule.exports = NATIVE_SYMBOL\n // eslint-disable-next-line no-undef\n && !Symbol.sham\n // eslint-disable-next-line no-undef\n && typeof Symbol.iterator == 'symbol';\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nexports.f = wellKnownSymbol;\n","var global = require('../internals/global');\nvar shared = require('../internals/shared');\nvar has = require('../internals/has');\nvar uid = require('../internals/uid');\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\nvar USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');\n\nvar WellKnownSymbolsStore = shared('wks');\nvar Symbol = global.Symbol;\nvar createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;\n\nmodule.exports = function (name) {\n if (!has(WellKnownSymbolsStore, name)) {\n if (NATIVE_SYMBOL && has(Symbol, name)) WellKnownSymbolsStore[name] = Symbol[name];\n else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);\n } return WellKnownSymbolsStore[name];\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar fails = require('../internals/fails');\nvar isArray = require('../internals/is-array');\nvar isObject = require('../internals/is-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar createProperty = require('../internals/create-property');\nvar arraySpeciesCreate = require('../internals/array-species-create');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');\nvar MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;\nvar MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded';\n\n// We can't use this feature detection in V8 since it causes\n// deoptimization and serious performance degradation\n// https://github.com/zloirock/core-js/issues/679\nvar IS_CONCAT_SPREADABLE_SUPPORT = V8_VERSION >= 51 || !fails(function () {\n var array = [];\n array[IS_CONCAT_SPREADABLE] = false;\n return array.concat()[0] !== array;\n});\n\nvar SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('concat');\n\nvar isConcatSpreadable = function (O) {\n if (!isObject(O)) return false;\n var spreadable = O[IS_CONCAT_SPREADABLE];\n return spreadable !== undefined ? !!spreadable : isArray(O);\n};\n\nvar FORCED = !IS_CONCAT_SPREADABLE_SUPPORT || !SPECIES_SUPPORT;\n\n// `Array.prototype.concat` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.concat\n// with adding support of @@isConcatSpreadable and @@species\n$({ target: 'Array', proto: true, forced: FORCED }, {\n concat: function concat(arg) { // eslint-disable-line no-unused-vars\n var O = toObject(this);\n var A = arraySpeciesCreate(O, 0);\n var n = 0;\n var i, k, length, len, E;\n for (i = -1, length = arguments.length; i < length; i++) {\n E = i === -1 ? O : arguments[i];\n if (isConcatSpreadable(E)) {\n len = toLength(E.length);\n if (n + len > MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);\n for (k = 0; k < len; k++, n++) if (k in E) createProperty(A, n, E[k]);\n } else {\n if (n >= MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);\n createProperty(A, n++, E);\n }\n }\n A.length = n;\n return A;\n }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $filter = require('../internals/array-iteration').filter;\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('filter');\n// Edge 14- issue\nvar USES_TO_LENGTH = arrayMethodUsesToLength('filter');\n\n// `Array.prototype.filter` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.filter\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH }, {\n filter: function filter(callbackfn /* , thisArg */) {\n return $filter(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $findIndex = require('../internals/array-iteration').findIndex;\nvar addToUnscopables = require('../internals/add-to-unscopables');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar FIND_INDEX = 'findIndex';\nvar SKIPS_HOLES = true;\n\nvar USES_TO_LENGTH = arrayMethodUsesToLength(FIND_INDEX);\n\n// Shouldn't skip holes\nif (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });\n\n// `Array.prototype.findIndex` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.findindex\n$({ target: 'Array', proto: true, forced: SKIPS_HOLES || !USES_TO_LENGTH }, {\n findIndex: function findIndex(callbackfn /* , that = undefined */) {\n return $findIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n\n// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables\naddToUnscopables(FIND_INDEX);\n","'use strict';\nvar $ = require('../internals/export');\nvar $find = require('../internals/array-iteration').find;\nvar addToUnscopables = require('../internals/add-to-unscopables');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar FIND = 'find';\nvar SKIPS_HOLES = true;\n\nvar USES_TO_LENGTH = arrayMethodUsesToLength(FIND);\n\n// Shouldn't skip holes\nif (FIND in []) Array(1)[FIND](function () { SKIPS_HOLES = false; });\n\n// `Array.prototype.find` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.find\n$({ target: 'Array', proto: true, forced: SKIPS_HOLES || !USES_TO_LENGTH }, {\n find: function find(callbackfn /* , that = undefined */) {\n return $find(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n\n// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables\naddToUnscopables(FIND);\n","'use strict';\nvar $ = require('../internals/export');\nvar flattenIntoArray = require('../internals/flatten-into-array');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar aFunction = require('../internals/a-function');\nvar arraySpeciesCreate = require('../internals/array-species-create');\n\n// `Array.prototype.flatMap` method\n// https://github.com/tc39/proposal-flatMap\n$({ target: 'Array', proto: true }, {\n flatMap: function flatMap(callbackfn /* , thisArg */) {\n var O = toObject(this);\n var sourceLen = toLength(O.length);\n var A;\n aFunction(callbackfn);\n A = arraySpeciesCreate(O, 0);\n A.length = flattenIntoArray(A, O, O, sourceLen, 0, 1, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n return A;\n }\n});\n","var $ = require('../internals/export');\nvar from = require('../internals/array-from');\nvar checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');\n\nvar INCORRECT_ITERATION = !checkCorrectnessOfIteration(function (iterable) {\n Array.from(iterable);\n});\n\n// `Array.from` method\n// https://tc39.github.io/ecma262/#sec-array.from\n$({ target: 'Array', stat: true, forced: INCORRECT_ITERATION }, {\n from: from\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $includes = require('../internals/array-includes').includes;\nvar addToUnscopables = require('../internals/add-to-unscopables');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar USES_TO_LENGTH = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });\n\n// `Array.prototype.includes` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.includes\n$({ target: 'Array', proto: true, forced: !USES_TO_LENGTH }, {\n includes: function includes(el /* , fromIndex = 0 */) {\n return $includes(this, el, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n\n// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables\naddToUnscopables('includes');\n","'use strict';\nvar $ = require('../internals/export');\nvar $indexOf = require('../internals/array-includes').indexOf;\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar nativeIndexOf = [].indexOf;\n\nvar NEGATIVE_ZERO = !!nativeIndexOf && 1 / [1].indexOf(1, -0) < 0;\nvar STRICT_METHOD = arrayMethodIsStrict('indexOf');\nvar USES_TO_LENGTH = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });\n\n// `Array.prototype.indexOf` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.indexof\n$({ target: 'Array', proto: true, forced: NEGATIVE_ZERO || !STRICT_METHOD || !USES_TO_LENGTH }, {\n indexOf: function indexOf(searchElement /* , fromIndex = 0 */) {\n return NEGATIVE_ZERO\n // convert -0 to +0\n ? nativeIndexOf.apply(this, arguments) || 0\n : $indexOf(this, searchElement, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n","'use strict';\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar addToUnscopables = require('../internals/add-to-unscopables');\nvar Iterators = require('../internals/iterators');\nvar InternalStateModule = require('../internals/internal-state');\nvar defineIterator = require('../internals/define-iterator');\n\nvar ARRAY_ITERATOR = 'Array Iterator';\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(ARRAY_ITERATOR);\n\n// `Array.prototype.entries` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.entries\n// `Array.prototype.keys` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.keys\n// `Array.prototype.values` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.values\n// `Array.prototype[@@iterator]` method\n// https://tc39.github.io/ecma262/#sec-array.prototype-@@iterator\n// `CreateArrayIterator` internal method\n// https://tc39.github.io/ecma262/#sec-createarrayiterator\nmodule.exports = defineIterator(Array, 'Array', function (iterated, kind) {\n setInternalState(this, {\n type: ARRAY_ITERATOR,\n target: toIndexedObject(iterated), // target\n index: 0, // next index\n kind: kind // kind\n });\n// `%ArrayIteratorPrototype%.next` method\n// https://tc39.github.io/ecma262/#sec-%arrayiteratorprototype%.next\n}, function () {\n var state = getInternalState(this);\n var target = state.target;\n var kind = state.kind;\n var index = state.index++;\n if (!target || index >= target.length) {\n state.target = undefined;\n return { value: undefined, done: true };\n }\n if (kind == 'keys') return { value: index, done: false };\n if (kind == 'values') return { value: target[index], done: false };\n return { value: [index, target[index]], done: false };\n}, 'values');\n\n// argumentsList[@@iterator] is %ArrayProto_values%\n// https://tc39.github.io/ecma262/#sec-createunmappedargumentsobject\n// https://tc39.github.io/ecma262/#sec-createmappedargumentsobject\nIterators.Arguments = Iterators.Array;\n\n// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables\naddToUnscopables('keys');\naddToUnscopables('values');\naddToUnscopables('entries');\n","'use strict';\nvar $ = require('../internals/export');\nvar IndexedObject = require('../internals/indexed-object');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\n\nvar nativeJoin = [].join;\n\nvar ES3_STRINGS = IndexedObject != Object;\nvar STRICT_METHOD = arrayMethodIsStrict('join', ',');\n\n// `Array.prototype.join` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.join\n$({ target: 'Array', proto: true, forced: ES3_STRINGS || !STRICT_METHOD }, {\n join: function join(separator) {\n return nativeJoin.call(toIndexedObject(this), separator === undefined ? ',' : separator);\n }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $map = require('../internals/array-iteration').map;\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('map');\n// FF49- issue\nvar USES_TO_LENGTH = arrayMethodUsesToLength('map');\n\n// `Array.prototype.map` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.map\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH }, {\n map: function map(callbackfn /* , thisArg */) {\n return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $reduce = require('../internals/array-reduce').left;\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar STRICT_METHOD = arrayMethodIsStrict('reduce');\nvar USES_TO_LENGTH = arrayMethodUsesToLength('reduce', { 1: 0 });\n\n// `Array.prototype.reduce` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.reduce\n$({ target: 'Array', proto: true, forced: !STRICT_METHOD || !USES_TO_LENGTH }, {\n reduce: function reduce(callbackfn /* , initialValue */) {\n return $reduce(this, callbackfn, arguments.length, arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar isObject = require('../internals/is-object');\nvar isArray = require('../internals/is-array');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toLength = require('../internals/to-length');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar createProperty = require('../internals/create-property');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\nvar arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('slice');\nvar USES_TO_LENGTH = arrayMethodUsesToLength('slice', { ACCESSORS: true, 0: 0, 1: 2 });\n\nvar SPECIES = wellKnownSymbol('species');\nvar nativeSlice = [].slice;\nvar max = Math.max;\n\n// `Array.prototype.slice` method\n// https://tc39.github.io/ecma262/#sec-array.prototype.slice\n// fallback for not array-like ES3 strings and DOM objects\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH }, {\n slice: function slice(start, end) {\n var O = toIndexedObject(this);\n var length = toLength(O.length);\n var k = toAbsoluteIndex(start, length);\n var fin = toAbsoluteIndex(end === undefined ? length : end, length);\n // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible\n var Constructor, result, n;\n if (isArray(O)) {\n Constructor = O.constructor;\n // cross-realm fallback\n if (typeof Constructor == 'function' && (Constructor === Array || isArray(Constructor.prototype))) {\n Constructor = undefined;\n } else if (isObject(Constructor)) {\n Constructor = Constructor[SPECIES];\n if (Constructor === null) Constructor = undefined;\n }\n if (Constructor === Array || Constructor === undefined) {\n return nativeSlice.call(O, k, fin);\n }\n }\n result = new (Constructor === undefined ? Array : Constructor)(max(fin - k, 0));\n for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);\n result.length = n;\n return result;\n }\n});\n","// this method was added to unscopables after implementation\n// in popular engines, so it's moved to a separate module\nvar addToUnscopables = require('../internals/add-to-unscopables');\n\naddToUnscopables('flatMap');\n","var DESCRIPTORS = require('../internals/descriptors');\nvar defineProperty = require('../internals/object-define-property').f;\n\nvar FunctionPrototype = Function.prototype;\nvar FunctionPrototypeToString = FunctionPrototype.toString;\nvar nameRE = /^\\s*function ([^ (]*)/;\nvar NAME = 'name';\n\n// Function instances `.name` property\n// https://tc39.github.io/ecma262/#sec-function-instances-name\nif (DESCRIPTORS && !(NAME in FunctionPrototype)) {\n defineProperty(FunctionPrototype, NAME, {\n configurable: true,\n get: function () {\n try {\n return FunctionPrototypeToString.call(this).match(nameRE)[1];\n } catch (error) {\n return '';\n }\n }\n });\n}\n","'use strict';\nvar $ = require('../internals/export');\nvar toInteger = require('../internals/to-integer');\nvar thisNumberValue = require('../internals/this-number-value');\nvar repeat = require('../internals/string-repeat');\nvar fails = require('../internals/fails');\n\nvar nativeToFixed = 1.0.toFixed;\nvar floor = Math.floor;\n\nvar pow = function (x, n, acc) {\n return n === 0 ? acc : n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc);\n};\n\nvar log = function (x) {\n var n = 0;\n var x2 = x;\n while (x2 >= 4096) {\n n += 12;\n x2 /= 4096;\n }\n while (x2 >= 2) {\n n += 1;\n x2 /= 2;\n } return n;\n};\n\nvar FORCED = nativeToFixed && (\n 0.00008.toFixed(3) !== '0.000' ||\n 0.9.toFixed(0) !== '1' ||\n 1.255.toFixed(2) !== '1.25' ||\n 1000000000000000128.0.toFixed(0) !== '1000000000000000128'\n) || !fails(function () {\n // V8 ~ Android 4.3-\n nativeToFixed.call({});\n});\n\n// `Number.prototype.toFixed` method\n// https://tc39.github.io/ecma262/#sec-number.prototype.tofixed\n$({ target: 'Number', proto: true, forced: FORCED }, {\n // eslint-disable-next-line max-statements\n toFixed: function toFixed(fractionDigits) {\n var number = thisNumberValue(this);\n var fractDigits = toInteger(fractionDigits);\n var data = [0, 0, 0, 0, 0, 0];\n var sign = '';\n var result = '0';\n var e, z, j, k;\n\n var multiply = function (n, c) {\n var index = -1;\n var c2 = c;\n while (++index < 6) {\n c2 += n * data[index];\n data[index] = c2 % 1e7;\n c2 = floor(c2 / 1e7);\n }\n };\n\n var divide = function (n) {\n var index = 6;\n var c = 0;\n while (--index >= 0) {\n c += data[index];\n data[index] = floor(c / n);\n c = (c % n) * 1e7;\n }\n };\n\n var dataToString = function () {\n var index = 6;\n var s = '';\n while (--index >= 0) {\n if (s !== '' || index === 0 || data[index] !== 0) {\n var t = String(data[index]);\n s = s === '' ? t : s + repeat.call('0', 7 - t.length) + t;\n }\n } return s;\n };\n\n if (fractDigits < 0 || fractDigits > 20) throw RangeError('Incorrect fraction digits');\n // eslint-disable-next-line no-self-compare\n if (number != number) return 'NaN';\n if (number <= -1e21 || number >= 1e21) return String(number);\n if (number < 0) {\n sign = '-';\n number = -number;\n }\n if (number > 1e-21) {\n e = log(number * pow(2, 69, 1)) - 69;\n z = e < 0 ? number * pow(2, -e, 1) : number / pow(2, e, 1);\n z *= 0x10000000000000;\n e = 52 - e;\n if (e > 0) {\n multiply(0, z);\n j = fractDigits;\n while (j >= 7) {\n multiply(1e7, 0);\n j -= 7;\n }\n multiply(pow(10, j, 1), 0);\n j = e - 1;\n while (j >= 23) {\n divide(1 << 23);\n j -= 23;\n }\n divide(1 << j);\n multiply(1, 1);\n divide(2);\n result = dataToString();\n } else {\n multiply(0, z);\n multiply(1 << -e, 0);\n result = dataToString() + repeat.call('0', fractDigits);\n }\n }\n if (fractDigits > 0) {\n k = result.length;\n result = sign + (k <= fractDigits\n ? '0.' + repeat.call('0', fractDigits - k) + result\n : result.slice(0, k - fractDigits) + '.' + result.slice(k - fractDigits));\n } else {\n result = sign + result;\n } return result;\n }\n});\n","var $ = require('../internals/export');\nvar assign = require('../internals/object-assign');\n\n// `Object.assign` method\n// https://tc39.github.io/ecma262/#sec-object.assign\n$({ target: 'Object', stat: true, forced: Object.assign !== assign }, {\n assign: assign\n});\n","var $ = require('../internals/export');\nvar toObject = require('../internals/to-object');\nvar nativeKeys = require('../internals/object-keys');\nvar fails = require('../internals/fails');\n\nvar FAILS_ON_PRIMITIVES = fails(function () { nativeKeys(1); });\n\n// `Object.keys` method\n// https://tc39.github.io/ecma262/#sec-object.keys\n$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {\n keys: function keys(it) {\n return nativeKeys(toObject(it));\n }\n});\n","var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar redefine = require('../internals/redefine');\nvar toString = require('../internals/object-to-string');\n\n// `Object.prototype.toString` method\n// https://tc39.github.io/ecma262/#sec-object.prototype.tostring\nif (!TO_STRING_TAG_SUPPORT) {\n redefine(Object.prototype, 'toString', toString, { unsafe: true });\n}\n","'use strict';\nvar $ = require('../internals/export');\nvar exec = require('../internals/regexp-exec');\n\n$({ target: 'RegExp', proto: true, forced: /./.exec !== exec }, {\n exec: exec\n});\n","'use strict';\nvar redefine = require('../internals/redefine');\nvar anObject = require('../internals/an-object');\nvar fails = require('../internals/fails');\nvar flags = require('../internals/regexp-flags');\n\nvar TO_STRING = 'toString';\nvar RegExpPrototype = RegExp.prototype;\nvar nativeToString = RegExpPrototype[TO_STRING];\n\nvar NOT_GENERIC = fails(function () { return nativeToString.call({ source: 'a', flags: 'b' }) != '/a/b'; });\n// FF44- RegExp#toString has a wrong name\nvar INCORRECT_NAME = nativeToString.name != TO_STRING;\n\n// `RegExp.prototype.toString` method\n// https://tc39.github.io/ecma262/#sec-regexp.prototype.tostring\nif (NOT_GENERIC || INCORRECT_NAME) {\n redefine(RegExp.prototype, TO_STRING, function toString() {\n var R = anObject(this);\n var p = String(R.source);\n var rf = R.flags;\n var f = String(rf === undefined && R instanceof RegExp && !('flags' in RegExpPrototype) ? flags.call(R) : rf);\n return '/' + p + '/' + f;\n }, { unsafe: true });\n}\n","'use strict';\nvar $ = require('../internals/export');\nvar notARegExp = require('../internals/not-a-regexp');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar correctIsRegExpLogic = require('../internals/correct-is-regexp-logic');\n\n// `String.prototype.includes` method\n// https://tc39.github.io/ecma262/#sec-string.prototype.includes\n$({ target: 'String', proto: true, forced: !correctIsRegExpLogic('includes') }, {\n includes: function includes(searchString /* , position = 0 */) {\n return !!~String(requireObjectCoercible(this))\n .indexOf(notARegExp(searchString), arguments.length > 1 ? arguments[1] : undefined);\n }\n});\n","'use strict';\nvar charAt = require('../internals/string-multibyte').charAt;\nvar InternalStateModule = require('../internals/internal-state');\nvar defineIterator = require('../internals/define-iterator');\n\nvar STRING_ITERATOR = 'String Iterator';\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);\n\n// `String.prototype[@@iterator]` method\n// https://tc39.github.io/ecma262/#sec-string.prototype-@@iterator\ndefineIterator(String, 'String', function (iterated) {\n setInternalState(this, {\n type: STRING_ITERATOR,\n string: String(iterated),\n index: 0\n });\n// `%StringIteratorPrototype%.next` method\n// https://tc39.github.io/ecma262/#sec-%stringiteratorprototype%.next\n}, function next() {\n var state = getInternalState(this);\n var string = state.string;\n var index = state.index;\n var point;\n if (index >= string.length) return { value: undefined, done: true };\n point = charAt(string, index);\n state.index += point.length;\n return { value: point, done: false };\n});\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\nvar max = Math.max;\nvar min = Math.min;\nvar floor = Math.floor;\nvar SUBSTITUTION_SYMBOLS = /\\$([$&'`]|\\d\\d?|<[^>]*>)/g;\nvar SUBSTITUTION_SYMBOLS_NO_NAMED = /\\$([$&'`]|\\d\\d?)/g;\n\nvar maybeToString = function (it) {\n return it === undefined ? it : String(it);\n};\n\n// @@replace logic\nfixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {\n var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;\n var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;\n var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';\n\n return [\n // `String.prototype.replace` method\n // https://tc39.github.io/ecma262/#sec-string.prototype.replace\n function replace(searchValue, replaceValue) {\n var O = requireObjectCoercible(this);\n var replacer = searchValue == undefined ? undefined : searchValue[REPLACE];\n return replacer !== undefined\n ? replacer.call(searchValue, O, replaceValue)\n : nativeReplace.call(String(O), searchValue, replaceValue);\n },\n // `RegExp.prototype[@@replace]` method\n // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@replace\n function (regexp, replaceValue) {\n if (\n (!REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE && REPLACE_KEEPS_$0) ||\n (typeof replaceValue === 'string' && replaceValue.indexOf(UNSAFE_SUBSTITUTE) === -1)\n ) {\n var res = maybeCallNative(nativeReplace, regexp, this, replaceValue);\n if (res.done) return res.value;\n }\n\n var rx = anObject(regexp);\n var S = String(this);\n\n var functionalReplace = typeof replaceValue === 'function';\n if (!functionalReplace) replaceValue = String(replaceValue);\n\n var global = rx.global;\n if (global) {\n var fullUnicode = rx.unicode;\n rx.lastIndex = 0;\n }\n var results = [];\n while (true) {\n var result = regExpExec(rx, S);\n if (result === null) break;\n\n results.push(result);\n if (!global) break;\n\n var matchStr = String(result[0]);\n if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);\n }\n\n var accumulatedResult = '';\n var nextSourcePosition = 0;\n for (var i = 0; i < results.length; i++) {\n result = results[i];\n\n var matched = String(result[0]);\n var position = max(min(toInteger(result.index), S.length), 0);\n var captures = [];\n // NOTE: This is equivalent to\n // captures = result.slice(1).map(maybeToString)\n // but for some reason `nativeSlice.call(result, 1, result.length)` (called in\n // the slice polyfill when slicing native arrays) \"doesn't work\" in safari 9 and\n // causes a crash (https://pastebin.com/N21QzeQA) when trying to debug it.\n for (var j = 1; j < result.length; j++) captures.push(maybeToString(result[j]));\n var namedCaptures = result.groups;\n if (functionalReplace) {\n var replacerArgs = [matched].concat(captures, position, S);\n if (namedCaptures !== undefined) replacerArgs.push(namedCaptures);\n var replacement = String(replaceValue.apply(undefined, replacerArgs));\n } else {\n replacement = getSubstitution(matched, S, position, captures, namedCaptures, replaceValue);\n }\n if (position >= nextSourcePosition) {\n accumulatedResult += S.slice(nextSourcePosition, position) + replacement;\n nextSourcePosition = position + matched.length;\n }\n }\n return accumulatedResult + S.slice(nextSourcePosition);\n }\n ];\n\n // https://tc39.github.io/ecma262/#sec-getsubstitution\n function getSubstitution(matched, str, position, captures, namedCaptures, replacement) {\n var tailPos = position + matched.length;\n var m = captures.length;\n var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;\n if (namedCaptures !== undefined) {\n namedCaptures = toObject(namedCaptures);\n symbols = SUBSTITUTION_SYMBOLS;\n }\n return nativeReplace.call(replacement, symbols, function (match, ch) {\n var capture;\n switch (ch.charAt(0)) {\n case '$': return '$';\n case '&': return matched;\n case '`': return str.slice(0, position);\n case \"'\": return str.slice(tailPos);\n case '<':\n capture = namedCaptures[ch.slice(1, -1)];\n break;\n default: // \\d\\d?\n var n = +ch;\n if (n === 0) return match;\n if (n > m) {\n var f = floor(n / 10);\n if (f === 0) return match;\n if (f <= m) return captures[f - 1] === undefined ? ch.charAt(1) : captures[f - 1] + ch.charAt(1);\n return match;\n }\n capture = captures[n - 1];\n }\n return capture === undefined ? '' : capture;\n });\n }\n});\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar sameValue = require('../internals/same-value');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\n// @@search logic\nfixRegExpWellKnownSymbolLogic('search', 1, function (SEARCH, nativeSearch, maybeCallNative) {\n return [\n // `String.prototype.search` method\n // https://tc39.github.io/ecma262/#sec-string.prototype.search\n function search(regexp) {\n var O = requireObjectCoercible(this);\n var searcher = regexp == undefined ? undefined : regexp[SEARCH];\n return searcher !== undefined ? searcher.call(regexp, O) : new RegExp(regexp)[SEARCH](String(O));\n },\n // `RegExp.prototype[@@search]` method\n // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@search\n function (regexp) {\n var res = maybeCallNative(nativeSearch, regexp, this);\n if (res.done) return res.value;\n\n var rx = anObject(regexp);\n var S = String(this);\n\n var previousLastIndex = rx.lastIndex;\n if (!sameValue(previousLastIndex, 0)) rx.lastIndex = 0;\n var result = regExpExec(rx, S);\n if (!sameValue(rx.lastIndex, previousLastIndex)) rx.lastIndex = previousLastIndex;\n return result === null ? -1 : result.index;\n }\n ];\n});\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar isRegExp = require('../internals/is-regexp');\nvar anObject = require('../internals/an-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar speciesConstructor = require('../internals/species-constructor');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar toLength = require('../internals/to-length');\nvar callRegExpExec = require('../internals/regexp-exec-abstract');\nvar regexpExec = require('../internals/regexp-exec');\nvar fails = require('../internals/fails');\n\nvar arrayPush = [].push;\nvar min = Math.min;\nvar MAX_UINT32 = 0xFFFFFFFF;\n\n// babel-minify transpiles RegExp('x', 'y') -> /x/y and it causes SyntaxError\nvar SUPPORTS_Y = !fails(function () { return !RegExp(MAX_UINT32, 'y'); });\n\n// @@split logic\nfixRegExpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCallNative) {\n var internalSplit;\n if (\n 'abbc'.split(/(b)*/)[1] == 'c' ||\n 'test'.split(/(?:)/, -1).length != 4 ||\n 'ab'.split(/(?:ab)*/).length != 2 ||\n '.'.split(/(.?)(.?)/).length != 4 ||\n '.'.split(/()()/).length > 1 ||\n ''.split(/.?/).length\n ) {\n // based on es5-shim implementation, need to rework it\n internalSplit = function (separator, limit) {\n var string = String(requireObjectCoercible(this));\n var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;\n if (lim === 0) return [];\n if (separator === undefined) return [string];\n // If `separator` is not a regex, use native split\n if (!isRegExp(separator)) {\n return nativeSplit.call(string, separator, lim);\n }\n var output = [];\n var flags = (separator.ignoreCase ? 'i' : '') +\n (separator.multiline ? 'm' : '') +\n (separator.unicode ? 'u' : '') +\n (separator.sticky ? 'y' : '');\n var lastLastIndex = 0;\n // Make `global` and avoid `lastIndex` issues by working with a copy\n var separatorCopy = new RegExp(separator.source, flags + 'g');\n var match, lastIndex, lastLength;\n while (match = regexpExec.call(separatorCopy, string)) {\n lastIndex = separatorCopy.lastIndex;\n if (lastIndex > lastLastIndex) {\n output.push(string.slice(lastLastIndex, match.index));\n if (match.length > 1 && match.index < string.length) arrayPush.apply(output, match.slice(1));\n lastLength = match[0].length;\n lastLastIndex = lastIndex;\n if (output.length >= lim) break;\n }\n if (separatorCopy.lastIndex === match.index) separatorCopy.lastIndex++; // Avoid an infinite loop\n }\n if (lastLastIndex === string.length) {\n if (lastLength || !separatorCopy.test('')) output.push('');\n } else output.push(string.slice(lastLastIndex));\n return output.length > lim ? output.slice(0, lim) : output;\n };\n // Chakra, V8\n } else if ('0'.split(undefined, 0).length) {\n internalSplit = function (separator, limit) {\n return separator === undefined && limit === 0 ? [] : nativeSplit.call(this, separator, limit);\n };\n } else internalSplit = nativeSplit;\n\n return [\n // `String.prototype.split` method\n // https://tc39.github.io/ecma262/#sec-string.prototype.split\n function split(separator, limit) {\n var O = requireObjectCoercible(this);\n var splitter = separator == undefined ? undefined : separator[SPLIT];\n return splitter !== undefined\n ? splitter.call(separator, O, limit)\n : internalSplit.call(String(O), separator, limit);\n },\n // `RegExp.prototype[@@split]` method\n // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@split\n //\n // NOTE: This cannot be properly polyfilled in engines that don't support\n // the 'y' flag.\n function (regexp, limit) {\n var res = maybeCallNative(internalSplit, regexp, this, limit, internalSplit !== nativeSplit);\n if (res.done) return res.value;\n\n var rx = anObject(regexp);\n var S = String(this);\n var C = speciesConstructor(rx, RegExp);\n\n var unicodeMatching = rx.unicode;\n var flags = (rx.ignoreCase ? 'i' : '') +\n (rx.multiline ? 'm' : '') +\n (rx.unicode ? 'u' : '') +\n (SUPPORTS_Y ? 'y' : 'g');\n\n // ^(? + rx + ) is needed, in combination with some S slicing, to\n // simulate the 'y' flag.\n var splitter = new C(SUPPORTS_Y ? rx : '^(?:' + rx.source + ')', flags);\n var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;\n if (lim === 0) return [];\n if (S.length === 0) return callRegExpExec(splitter, S) === null ? [S] : [];\n var p = 0;\n var q = 0;\n var A = [];\n while (q < S.length) {\n splitter.lastIndex = SUPPORTS_Y ? q : 0;\n var z = callRegExpExec(splitter, SUPPORTS_Y ? S : S.slice(q));\n var e;\n if (\n z === null ||\n (e = min(toLength(splitter.lastIndex + (SUPPORTS_Y ? 0 : q)), S.length)) === p\n ) {\n q = advanceStringIndex(S, q, unicodeMatching);\n } else {\n A.push(S.slice(p, q));\n if (A.length === lim) return A;\n for (var i = 1; i <= z.length - 1; i++) {\n A.push(z[i]);\n if (A.length === lim) return A;\n }\n q = p = e;\n }\n }\n A.push(S.slice(p));\n return A;\n }\n ];\n}, !SUPPORTS_Y);\n","// `Symbol.prototype.description` getter\n// https://tc39.github.io/ecma262/#sec-symbol.prototype.description\n'use strict';\nvar $ = require('../internals/export');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar global = require('../internals/global');\nvar has = require('../internals/has');\nvar isObject = require('../internals/is-object');\nvar defineProperty = require('../internals/object-define-property').f;\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\n\nvar NativeSymbol = global.Symbol;\n\nif (DESCRIPTORS && typeof NativeSymbol == 'function' && (!('description' in NativeSymbol.prototype) ||\n // Safari 12 bug\n NativeSymbol().description !== undefined\n)) {\n var EmptyStringDescriptionStore = {};\n // wrap Symbol constructor for correct work with undefined description\n var SymbolWrapper = function Symbol() {\n var description = arguments.length < 1 || arguments[0] === undefined ? undefined : String(arguments[0]);\n var result = this instanceof SymbolWrapper\n ? new NativeSymbol(description)\n // in Edge 13, String(Symbol(undefined)) === 'Symbol(undefined)'\n : description === undefined ? NativeSymbol() : NativeSymbol(description);\n if (description === '') EmptyStringDescriptionStore[result] = true;\n return result;\n };\n copyConstructorProperties(SymbolWrapper, NativeSymbol);\n var symbolPrototype = SymbolWrapper.prototype = NativeSymbol.prototype;\n symbolPrototype.constructor = SymbolWrapper;\n\n var symbolToString = symbolPrototype.toString;\n var native = String(NativeSymbol('test')) == 'Symbol(test)';\n var regexp = /^Symbol\\((.*)\\)[^)]+$/;\n defineProperty(symbolPrototype, 'description', {\n configurable: true,\n get: function description() {\n var symbol = isObject(this) ? this.valueOf() : this;\n var string = symbolToString.call(symbol);\n if (has(EmptyStringDescriptionStore, symbol)) return '';\n var desc = native ? string.slice(7, -1) : string.replace(regexp, '$1');\n return desc === '' ? undefined : desc;\n }\n });\n\n $({ global: true, forced: true }, {\n Symbol: SymbolWrapper\n });\n}\n","var defineWellKnownSymbol = require('../internals/define-well-known-symbol');\n\n// `Symbol.iterator` well-known symbol\n// https://tc39.github.io/ecma262/#sec-symbol.iterator\ndefineWellKnownSymbol('iterator');\n","'use strict';\nvar $ = require('../internals/export');\nvar global = require('../internals/global');\nvar getBuiltIn = require('../internals/get-built-in');\nvar IS_PURE = require('../internals/is-pure');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\nvar USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');\nvar fails = require('../internals/fails');\nvar has = require('../internals/has');\nvar isArray = require('../internals/is-array');\nvar isObject = require('../internals/is-object');\nvar anObject = require('../internals/an-object');\nvar toObject = require('../internals/to-object');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar toPrimitive = require('../internals/to-primitive');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar nativeObjectCreate = require('../internals/object-create');\nvar objectKeys = require('../internals/object-keys');\nvar getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');\nvar getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');\nvar definePropertyModule = require('../internals/object-define-property');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar shared = require('../internals/shared');\nvar sharedKey = require('../internals/shared-key');\nvar hiddenKeys = require('../internals/hidden-keys');\nvar uid = require('../internals/uid');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');\nvar defineWellKnownSymbol = require('../internals/define-well-known-symbol');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar InternalStateModule = require('../internals/internal-state');\nvar $forEach = require('../internals/array-iteration').forEach;\n\nvar HIDDEN = sharedKey('hidden');\nvar SYMBOL = 'Symbol';\nvar PROTOTYPE = 'prototype';\nvar TO_PRIMITIVE = wellKnownSymbol('toPrimitive');\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(SYMBOL);\nvar ObjectPrototype = Object[PROTOTYPE];\nvar $Symbol = global.Symbol;\nvar $stringify = getBuiltIn('JSON', 'stringify');\nvar nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;\nvar nativeDefineProperty = definePropertyModule.f;\nvar nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;\nvar nativePropertyIsEnumerable = propertyIsEnumerableModule.f;\nvar AllSymbols = shared('symbols');\nvar ObjectPrototypeSymbols = shared('op-symbols');\nvar StringToSymbolRegistry = shared('string-to-symbol-registry');\nvar SymbolToStringRegistry = shared('symbol-to-string-registry');\nvar WellKnownSymbolsStore = shared('wks');\nvar QObject = global.QObject;\n// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173\nvar USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;\n\n// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687\nvar setSymbolDescriptor = DESCRIPTORS && fails(function () {\n return nativeObjectCreate(nativeDefineProperty({}, 'a', {\n get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }\n })).a != 7;\n}) ? function (O, P, Attributes) {\n var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);\n if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];\n nativeDefineProperty(O, P, Attributes);\n if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {\n nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);\n }\n} : nativeDefineProperty;\n\nvar wrap = function (tag, description) {\n var symbol = AllSymbols[tag] = nativeObjectCreate($Symbol[PROTOTYPE]);\n setInternalState(symbol, {\n type: SYMBOL,\n tag: tag,\n description: description\n });\n if (!DESCRIPTORS) symbol.description = description;\n return symbol;\n};\n\nvar isSymbol = USE_SYMBOL_AS_UID ? function (it) {\n return typeof it == 'symbol';\n} : function (it) {\n return Object(it) instanceof $Symbol;\n};\n\nvar $defineProperty = function defineProperty(O, P, Attributes) {\n if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);\n anObject(O);\n var key = toPrimitive(P, true);\n anObject(Attributes);\n if (has(AllSymbols, key)) {\n if (!Attributes.enumerable) {\n if (!has(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, {}));\n O[HIDDEN][key] = true;\n } else {\n if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;\n Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });\n } return setSymbolDescriptor(O, key, Attributes);\n } return nativeDefineProperty(O, key, Attributes);\n};\n\nvar $defineProperties = function defineProperties(O, Properties) {\n anObject(O);\n var properties = toIndexedObject(Properties);\n var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));\n $forEach(keys, function (key) {\n if (!DESCRIPTORS || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);\n });\n return O;\n};\n\nvar $create = function create(O, Properties) {\n return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);\n};\n\nvar $propertyIsEnumerable = function propertyIsEnumerable(V) {\n var P = toPrimitive(V, true);\n var enumerable = nativePropertyIsEnumerable.call(this, P);\n if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;\n return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;\n};\n\nvar $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {\n var it = toIndexedObject(O);\n var key = toPrimitive(P, true);\n if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;\n var descriptor = nativeGetOwnPropertyDescriptor(it, key);\n if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {\n descriptor.enumerable = true;\n }\n return descriptor;\n};\n\nvar $getOwnPropertyNames = function getOwnPropertyNames(O) {\n var names = nativeGetOwnPropertyNames(toIndexedObject(O));\n var result = [];\n $forEach(names, function (key) {\n if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);\n });\n return result;\n};\n\nvar $getOwnPropertySymbols = function getOwnPropertySymbols(O) {\n var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;\n var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));\n var result = [];\n $forEach(names, function (key) {\n if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {\n result.push(AllSymbols[key]);\n }\n });\n return result;\n};\n\n// `Symbol` constructor\n// https://tc39.github.io/ecma262/#sec-symbol-constructor\nif (!NATIVE_SYMBOL) {\n $Symbol = function Symbol() {\n if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');\n var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);\n var tag = uid(description);\n var setter = function (value) {\n if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);\n if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;\n setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));\n };\n if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });\n return wrap(tag, description);\n };\n\n redefine($Symbol[PROTOTYPE], 'toString', function toString() {\n return getInternalState(this).tag;\n });\n\n redefine($Symbol, 'withoutSetter', function (description) {\n return wrap(uid(description), description);\n });\n\n propertyIsEnumerableModule.f = $propertyIsEnumerable;\n definePropertyModule.f = $defineProperty;\n getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;\n getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;\n getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;\n\n wrappedWellKnownSymbolModule.f = function (name) {\n return wrap(wellKnownSymbol(name), name);\n };\n\n if (DESCRIPTORS) {\n // https://github.com/tc39/proposal-Symbol-description\n nativeDefineProperty($Symbol[PROTOTYPE], 'description', {\n configurable: true,\n get: function description() {\n return getInternalState(this).description;\n }\n });\n if (!IS_PURE) {\n redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });\n }\n }\n}\n\n$({ global: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {\n Symbol: $Symbol\n});\n\n$forEach(objectKeys(WellKnownSymbolsStore), function (name) {\n defineWellKnownSymbol(name);\n});\n\n$({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {\n // `Symbol.for` method\n // https://tc39.github.io/ecma262/#sec-symbol.for\n 'for': function (key) {\n var string = String(key);\n if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];\n var symbol = $Symbol(string);\n StringToSymbolRegistry[string] = symbol;\n SymbolToStringRegistry[symbol] = string;\n return symbol;\n },\n // `Symbol.keyFor` method\n // https://tc39.github.io/ecma262/#sec-symbol.keyfor\n keyFor: function keyFor(sym) {\n if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');\n if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];\n },\n useSetter: function () { USE_SETTER = true; },\n useSimple: function () { USE_SETTER = false; }\n});\n\n$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {\n // `Object.create` method\n // https://tc39.github.io/ecma262/#sec-object.create\n create: $create,\n // `Object.defineProperty` method\n // https://tc39.github.io/ecma262/#sec-object.defineproperty\n defineProperty: $defineProperty,\n // `Object.defineProperties` method\n // https://tc39.github.io/ecma262/#sec-object.defineproperties\n defineProperties: $defineProperties,\n // `Object.getOwnPropertyDescriptor` method\n // https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptors\n getOwnPropertyDescriptor: $getOwnPropertyDescriptor\n});\n\n$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {\n // `Object.getOwnPropertyNames` method\n // https://tc39.github.io/ecma262/#sec-object.getownpropertynames\n getOwnPropertyNames: $getOwnPropertyNames,\n // `Object.getOwnPropertySymbols` method\n // https://tc39.github.io/ecma262/#sec-object.getownpropertysymbols\n getOwnPropertySymbols: $getOwnPropertySymbols\n});\n\n// Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives\n// https://bugs.chromium.org/p/v8/issues/detail?id=3443\n$({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {\n getOwnPropertySymbols: function getOwnPropertySymbols(it) {\n return getOwnPropertySymbolsModule.f(toObject(it));\n }\n});\n\n// `JSON.stringify` method behavior with symbols\n// https://tc39.github.io/ecma262/#sec-json.stringify\nif ($stringify) {\n var FORCED_JSON_STRINGIFY = !NATIVE_SYMBOL || fails(function () {\n var symbol = $Symbol();\n // MS Edge converts symbol values to JSON as {}\n return $stringify([symbol]) != '[null]'\n // WebKit converts symbol values to JSON as null\n || $stringify({ a: symbol }) != '{}'\n // V8 throws on boxed symbols\n || $stringify(Object(symbol)) != '{}';\n });\n\n $({ target: 'JSON', stat: true, forced: FORCED_JSON_STRINGIFY }, {\n // eslint-disable-next-line no-unused-vars\n stringify: function stringify(it, replacer, space) {\n var args = [it];\n var index = 1;\n var $replacer;\n while (arguments.length > index) args.push(arguments[index++]);\n $replacer = replacer;\n if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined\n if (!isArray(replacer)) replacer = function (key, value) {\n if (typeof $replacer == 'function') value = $replacer.call(this, key, value);\n if (!isSymbol(value)) return value;\n };\n args[1] = replacer;\n return $stringify.apply(null, args);\n }\n });\n}\n\n// `Symbol.prototype[@@toPrimitive]` method\n// https://tc39.github.io/ecma262/#sec-symbol.prototype-@@toprimitive\nif (!$Symbol[PROTOTYPE][TO_PRIMITIVE]) {\n createNonEnumerableProperty($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);\n}\n// `Symbol.prototype[@@toStringTag]` property\n// https://tc39.github.io/ecma262/#sec-symbol.prototype-@@tostringtag\nsetToStringTag($Symbol, SYMBOL);\n\nhiddenKeys[HIDDEN] = true;\n","var global = require('../internals/global');\nvar DOMIterables = require('../internals/dom-iterables');\nvar ArrayIteratorMethods = require('../modules/es.array.iterator');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\nvar ArrayValues = ArrayIteratorMethods.values;\n\nfor (var COLLECTION_NAME in DOMIterables) {\n var Collection = global[COLLECTION_NAME];\n var CollectionPrototype = Collection && Collection.prototype;\n if (CollectionPrototype) {\n // some Chrome versions have non-configurable methods on DOMTokenList\n if (CollectionPrototype[ITERATOR] !== ArrayValues) try {\n createNonEnumerableProperty(CollectionPrototype, ITERATOR, ArrayValues);\n } catch (error) {\n CollectionPrototype[ITERATOR] = ArrayValues;\n }\n if (!CollectionPrototype[TO_STRING_TAG]) {\n createNonEnumerableProperty(CollectionPrototype, TO_STRING_TAG, COLLECTION_NAME);\n }\n if (DOMIterables[COLLECTION_NAME]) for (var METHOD_NAME in ArrayIteratorMethods) {\n // some Chrome versions have non-configurable methods on DOMTokenList\n if (CollectionPrototype[METHOD_NAME] !== ArrayIteratorMethods[METHOD_NAME]) try {\n createNonEnumerableProperty(CollectionPrototype, METHOD_NAME, ArrayIteratorMethods[METHOD_NAME]);\n } catch (error) {\n CollectionPrototype[METHOD_NAME] = ArrayIteratorMethods[METHOD_NAME];\n }\n }\n }\n}\n","'use strict';\n// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`\nrequire('../modules/es.array.iterator');\nvar $ = require('../internals/export');\nvar getBuiltIn = require('../internals/get-built-in');\nvar USE_NATIVE_URL = require('../internals/native-url');\nvar redefine = require('../internals/redefine');\nvar redefineAll = require('../internals/redefine-all');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar createIteratorConstructor = require('../internals/create-iterator-constructor');\nvar InternalStateModule = require('../internals/internal-state');\nvar anInstance = require('../internals/an-instance');\nvar hasOwn = require('../internals/has');\nvar bind = require('../internals/function-bind-context');\nvar classof = require('../internals/classof');\nvar anObject = require('../internals/an-object');\nvar isObject = require('../internals/is-object');\nvar create = require('../internals/object-create');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar getIterator = require('../internals/get-iterator');\nvar getIteratorMethod = require('../internals/get-iterator-method');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar $fetch = getBuiltIn('fetch');\nvar Headers = getBuiltIn('Headers');\nvar ITERATOR = wellKnownSymbol('iterator');\nvar URL_SEARCH_PARAMS = 'URLSearchParams';\nvar URL_SEARCH_PARAMS_ITERATOR = URL_SEARCH_PARAMS + 'Iterator';\nvar setInternalState = InternalStateModule.set;\nvar getInternalParamsState = InternalStateModule.getterFor(URL_SEARCH_PARAMS);\nvar getInternalIteratorState = InternalStateModule.getterFor(URL_SEARCH_PARAMS_ITERATOR);\n\nvar plus = /\\+/g;\nvar sequences = Array(4);\n\nvar percentSequence = function (bytes) {\n return sequences[bytes - 1] || (sequences[bytes - 1] = RegExp('((?:%[\\\\da-f]{2}){' + bytes + '})', 'gi'));\n};\n\nvar percentDecode = function (sequence) {\n try {\n return decodeURIComponent(sequence);\n } catch (error) {\n return sequence;\n }\n};\n\nvar deserialize = function (it) {\n var result = it.replace(plus, ' ');\n var bytes = 4;\n try {\n return decodeURIComponent(result);\n } catch (error) {\n while (bytes) {\n result = result.replace(percentSequence(bytes--), percentDecode);\n }\n return result;\n }\n};\n\nvar find = /[!'()~]|%20/g;\n\nvar replace = {\n '!': '%21',\n \"'\": '%27',\n '(': '%28',\n ')': '%29',\n '~': '%7E',\n '%20': '+'\n};\n\nvar replacer = function (match) {\n return replace[match];\n};\n\nvar serialize = function (it) {\n return encodeURIComponent(it).replace(find, replacer);\n};\n\nvar parseSearchParams = function (result, query) {\n if (query) {\n var attributes = query.split('&');\n var index = 0;\n var attribute, entry;\n while (index < attributes.length) {\n attribute = attributes[index++];\n if (attribute.length) {\n entry = attribute.split('=');\n result.push({\n key: deserialize(entry.shift()),\n value: deserialize(entry.join('='))\n });\n }\n }\n }\n};\n\nvar updateSearchParams = function (query) {\n this.entries.length = 0;\n parseSearchParams(this.entries, query);\n};\n\nvar validateArgumentsLength = function (passed, required) {\n if (passed < required) throw TypeError('Not enough arguments');\n};\n\nvar URLSearchParamsIterator = createIteratorConstructor(function Iterator(params, kind) {\n setInternalState(this, {\n type: URL_SEARCH_PARAMS_ITERATOR,\n iterator: getIterator(getInternalParamsState(params).entries),\n kind: kind\n });\n}, 'Iterator', function next() {\n var state = getInternalIteratorState(this);\n var kind = state.kind;\n var step = state.iterator.next();\n var entry = step.value;\n if (!step.done) {\n step.value = kind === 'keys' ? entry.key : kind === 'values' ? entry.value : [entry.key, entry.value];\n } return step;\n});\n\n// `URLSearchParams` constructor\n// https://url.spec.whatwg.org/#interface-urlsearchparams\nvar URLSearchParamsConstructor = function URLSearchParams(/* init */) {\n anInstance(this, URLSearchParamsConstructor, URL_SEARCH_PARAMS);\n var init = arguments.length > 0 ? arguments[0] : undefined;\n var that = this;\n var entries = [];\n var iteratorMethod, iterator, next, step, entryIterator, entryNext, first, second, key;\n\n setInternalState(that, {\n type: URL_SEARCH_PARAMS,\n entries: entries,\n updateURL: function () { /* empty */ },\n updateSearchParams: updateSearchParams\n });\n\n if (init !== undefined) {\n if (isObject(init)) {\n iteratorMethod = getIteratorMethod(init);\n if (typeof iteratorMethod === 'function') {\n iterator = iteratorMethod.call(init);\n next = iterator.next;\n while (!(step = next.call(iterator)).done) {\n entryIterator = getIterator(anObject(step.value));\n entryNext = entryIterator.next;\n if (\n (first = entryNext.call(entryIterator)).done ||\n (second = entryNext.call(entryIterator)).done ||\n !entryNext.call(entryIterator).done\n ) throw TypeError('Expected sequence with length 2');\n entries.push({ key: first.value + '', value: second.value + '' });\n }\n } else for (key in init) if (hasOwn(init, key)) entries.push({ key: key, value: init[key] + '' });\n } else {\n parseSearchParams(entries, typeof init === 'string' ? init.charAt(0) === '?' ? init.slice(1) : init : init + '');\n }\n }\n};\n\nvar URLSearchParamsPrototype = URLSearchParamsConstructor.prototype;\n\nredefineAll(URLSearchParamsPrototype, {\n // `URLSearchParams.prototype.appent` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-append\n append: function append(name, value) {\n validateArgumentsLength(arguments.length, 2);\n var state = getInternalParamsState(this);\n state.entries.push({ key: name + '', value: value + '' });\n state.updateURL();\n },\n // `URLSearchParams.prototype.delete` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-delete\n 'delete': function (name) {\n validateArgumentsLength(arguments.length, 1);\n var state = getInternalParamsState(this);\n var entries = state.entries;\n var key = name + '';\n var index = 0;\n while (index < entries.length) {\n if (entries[index].key === key) entries.splice(index, 1);\n else index++;\n }\n state.updateURL();\n },\n // `URLSearchParams.prototype.get` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-get\n get: function get(name) {\n validateArgumentsLength(arguments.length, 1);\n var entries = getInternalParamsState(this).entries;\n var key = name + '';\n var index = 0;\n for (; index < entries.length; index++) {\n if (entries[index].key === key) return entries[index].value;\n }\n return null;\n },\n // `URLSearchParams.prototype.getAll` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-getall\n getAll: function getAll(name) {\n validateArgumentsLength(arguments.length, 1);\n var entries = getInternalParamsState(this).entries;\n var key = name + '';\n var result = [];\n var index = 0;\n for (; index < entries.length; index++) {\n if (entries[index].key === key) result.push(entries[index].value);\n }\n return result;\n },\n // `URLSearchParams.prototype.has` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-has\n has: function has(name) {\n validateArgumentsLength(arguments.length, 1);\n var entries = getInternalParamsState(this).entries;\n var key = name + '';\n var index = 0;\n while (index < entries.length) {\n if (entries[index++].key === key) return true;\n }\n return false;\n },\n // `URLSearchParams.prototype.set` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-set\n set: function set(name, value) {\n validateArgumentsLength(arguments.length, 1);\n var state = getInternalParamsState(this);\n var entries = state.entries;\n var found = false;\n var key = name + '';\n var val = value + '';\n var index = 0;\n var entry;\n for (; index < entries.length; index++) {\n entry = entries[index];\n if (entry.key === key) {\n if (found) entries.splice(index--, 1);\n else {\n found = true;\n entry.value = val;\n }\n }\n }\n if (!found) entries.push({ key: key, value: val });\n state.updateURL();\n },\n // `URLSearchParams.prototype.sort` method\n // https://url.spec.whatwg.org/#dom-urlsearchparams-sort\n sort: function sort() {\n var state = getInternalParamsState(this);\n var entries = state.entries;\n // Array#sort is not stable in some engines\n var slice = entries.slice();\n var entry, entriesIndex, sliceIndex;\n entries.length = 0;\n for (sliceIndex = 0; sliceIndex < slice.length; sliceIndex++) {\n entry = slice[sliceIndex];\n for (entriesIndex = 0; entriesIndex < sliceIndex; entriesIndex++) {\n if (entries[entriesIndex].key > entry.key) {\n entries.splice(entriesIndex, 0, entry);\n break;\n }\n }\n if (entriesIndex === sliceIndex) entries.push(entry);\n }\n state.updateURL();\n },\n // `URLSearchParams.prototype.forEach` method\n forEach: function forEach(callback /* , thisArg */) {\n var entries = getInternalParamsState(this).entries;\n var boundFunction = bind(callback, arguments.length > 1 ? arguments[1] : undefined, 3);\n var index = 0;\n var entry;\n while (index < entries.length) {\n entry = entries[index++];\n boundFunction(entry.value, entry.key, this);\n }\n },\n // `URLSearchParams.prototype.keys` method\n keys: function keys() {\n return new URLSearchParamsIterator(this, 'keys');\n },\n // `URLSearchParams.prototype.values` method\n values: function values() {\n return new URLSearchParamsIterator(this, 'values');\n },\n // `URLSearchParams.prototype.entries` method\n entries: function entries() {\n return new URLSearchParamsIterator(this, 'entries');\n }\n}, { enumerable: true });\n\n// `URLSearchParams.prototype[@@iterator]` method\nredefine(URLSearchParamsPrototype, ITERATOR, URLSearchParamsPrototype.entries);\n\n// `URLSearchParams.prototype.toString` method\n// https://url.spec.whatwg.org/#urlsearchparams-stringification-behavior\nredefine(URLSearchParamsPrototype, 'toString', function toString() {\n var entries = getInternalParamsState(this).entries;\n var result = [];\n var index = 0;\n var entry;\n while (index < entries.length) {\n entry = entries[index++];\n result.push(serialize(entry.key) + '=' + serialize(entry.value));\n } return result.join('&');\n}, { enumerable: true });\n\nsetToStringTag(URLSearchParamsConstructor, URL_SEARCH_PARAMS);\n\n$({ global: true, forced: !USE_NATIVE_URL }, {\n URLSearchParams: URLSearchParamsConstructor\n});\n\n// Wrap `fetch` for correct work with polyfilled `URLSearchParams`\n// https://github.com/zloirock/core-js/issues/674\nif (!USE_NATIVE_URL && typeof $fetch == 'function' && typeof Headers == 'function') {\n $({ global: true, enumerable: true, forced: true }, {\n fetch: function fetch(input /* , init */) {\n var args = [input];\n var init, body, headers;\n if (arguments.length > 1) {\n init = arguments[1];\n if (isObject(init)) {\n body = init.body;\n if (classof(body) === URL_SEARCH_PARAMS) {\n headers = init.headers ? new Headers(init.headers) : new Headers();\n if (!headers.has('content-type')) {\n headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8');\n }\n init = create(init, {\n body: createPropertyDescriptor(0, String(body)),\n headers: createPropertyDescriptor(0, headers)\n });\n }\n }\n args.push(init);\n } return $fetch.apply(this, args);\n }\n });\n}\n\nmodule.exports = {\n URLSearchParams: URLSearchParamsConstructor,\n getState: getInternalParamsState\n};\n","'use strict';\n// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`\nrequire('../modules/es.string.iterator');\nvar $ = require('../internals/export');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar USE_NATIVE_URL = require('../internals/native-url');\nvar global = require('../internals/global');\nvar defineProperties = require('../internals/object-define-properties');\nvar redefine = require('../internals/redefine');\nvar anInstance = require('../internals/an-instance');\nvar has = require('../internals/has');\nvar assign = require('../internals/object-assign');\nvar arrayFrom = require('../internals/array-from');\nvar codeAt = require('../internals/string-multibyte').codeAt;\nvar toASCII = require('../internals/string-punycode-to-ascii');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar URLSearchParamsModule = require('../modules/web.url-search-params');\nvar InternalStateModule = require('../internals/internal-state');\n\nvar NativeURL = global.URL;\nvar URLSearchParams = URLSearchParamsModule.URLSearchParams;\nvar getInternalSearchParamsState = URLSearchParamsModule.getState;\nvar setInternalState = InternalStateModule.set;\nvar getInternalURLState = InternalStateModule.getterFor('URL');\nvar floor = Math.floor;\nvar pow = Math.pow;\n\nvar INVALID_AUTHORITY = 'Invalid authority';\nvar INVALID_SCHEME = 'Invalid scheme';\nvar INVALID_HOST = 'Invalid host';\nvar INVALID_PORT = 'Invalid port';\n\nvar ALPHA = /[A-Za-z]/;\nvar ALPHANUMERIC = /[\\d+-.A-Za-z]/;\nvar DIGIT = /\\d/;\nvar HEX_START = /^(0x|0X)/;\nvar OCT = /^[0-7]+$/;\nvar DEC = /^\\d+$/;\nvar HEX = /^[\\dA-Fa-f]+$/;\n// eslint-disable-next-line no-control-regex\nvar FORBIDDEN_HOST_CODE_POINT = /[\\u0000\\u0009\\u000A\\u000D #%/:?@[\\\\]]/;\n// eslint-disable-next-line no-control-regex\nvar FORBIDDEN_HOST_CODE_POINT_EXCLUDING_PERCENT = /[\\u0000\\u0009\\u000A\\u000D #/:?@[\\\\]]/;\n// eslint-disable-next-line no-control-regex\nvar LEADING_AND_TRAILING_C0_CONTROL_OR_SPACE = /^[\\u0000-\\u001F ]+|[\\u0000-\\u001F ]+$/g;\n// eslint-disable-next-line no-control-regex\nvar TAB_AND_NEW_LINE = /[\\u0009\\u000A\\u000D]/g;\nvar EOF;\n\nvar parseHost = function (url, input) {\n var result, codePoints, index;\n if (input.charAt(0) == '[') {\n if (input.charAt(input.length - 1) != ']') return INVALID_HOST;\n result = parseIPv6(input.slice(1, -1));\n if (!result) return INVALID_HOST;\n url.host = result;\n // opaque host\n } else if (!isSpecial(url)) {\n if (FORBIDDEN_HOST_CODE_POINT_EXCLUDING_PERCENT.test(input)) return INVALID_HOST;\n result = '';\n codePoints = arrayFrom(input);\n for (index = 0; index < codePoints.length; index++) {\n result += percentEncode(codePoints[index], C0ControlPercentEncodeSet);\n }\n url.host = result;\n } else {\n input = toASCII(input);\n if (FORBIDDEN_HOST_CODE_POINT.test(input)) return INVALID_HOST;\n result = parseIPv4(input);\n if (result === null) return INVALID_HOST;\n url.host = result;\n }\n};\n\nvar parseIPv4 = function (input) {\n var parts = input.split('.');\n var partsLength, numbers, index, part, radix, number, ipv4;\n if (parts.length && parts[parts.length - 1] == '') {\n parts.pop();\n }\n partsLength = parts.length;\n if (partsLength > 4) return input;\n numbers = [];\n for (index = 0; index < partsLength; index++) {\n part = parts[index];\n if (part == '') return input;\n radix = 10;\n if (part.length > 1 && part.charAt(0) == '0') {\n radix = HEX_START.test(part) ? 16 : 8;\n part = part.slice(radix == 8 ? 1 : 2);\n }\n if (part === '') {\n number = 0;\n } else {\n if (!(radix == 10 ? DEC : radix == 8 ? OCT : HEX).test(part)) return input;\n number = parseInt(part, radix);\n }\n numbers.push(number);\n }\n for (index = 0; index < partsLength; index++) {\n number = numbers[index];\n if (index == partsLength - 1) {\n if (number >= pow(256, 5 - partsLength)) return null;\n } else if (number > 255) return null;\n }\n ipv4 = numbers.pop();\n for (index = 0; index < numbers.length; index++) {\n ipv4 += numbers[index] * pow(256, 3 - index);\n }\n return ipv4;\n};\n\n// eslint-disable-next-line max-statements\nvar parseIPv6 = function (input) {\n var address = [0, 0, 0, 0, 0, 0, 0, 0];\n var pieceIndex = 0;\n var compress = null;\n var pointer = 0;\n var value, length, numbersSeen, ipv4Piece, number, swaps, swap;\n\n var char = function () {\n return input.charAt(pointer);\n };\n\n if (char() == ':') {\n if (input.charAt(1) != ':') return;\n pointer += 2;\n pieceIndex++;\n compress = pieceIndex;\n }\n while (char()) {\n if (pieceIndex == 8) return;\n if (char() == ':') {\n if (compress !== null) return;\n pointer++;\n pieceIndex++;\n compress = pieceIndex;\n continue;\n }\n value = length = 0;\n while (length < 4 && HEX.test(char())) {\n value = value * 16 + parseInt(char(), 16);\n pointer++;\n length++;\n }\n if (char() == '.') {\n if (length == 0) return;\n pointer -= length;\n if (pieceIndex > 6) return;\n numbersSeen = 0;\n while (char()) {\n ipv4Piece = null;\n if (numbersSeen > 0) {\n if (char() == '.' && numbersSeen < 4) pointer++;\n else return;\n }\n if (!DIGIT.test(char())) return;\n while (DIGIT.test(char())) {\n number = parseInt(char(), 10);\n if (ipv4Piece === null) ipv4Piece = number;\n else if (ipv4Piece == 0) return;\n else ipv4Piece = ipv4Piece * 10 + number;\n if (ipv4Piece > 255) return;\n pointer++;\n }\n address[pieceIndex] = address[pieceIndex] * 256 + ipv4Piece;\n numbersSeen++;\n if (numbersSeen == 2 || numbersSeen == 4) pieceIndex++;\n }\n if (numbersSeen != 4) return;\n break;\n } else if (char() == ':') {\n pointer++;\n if (!char()) return;\n } else if (char()) return;\n address[pieceIndex++] = value;\n }\n if (compress !== null) {\n swaps = pieceIndex - compress;\n pieceIndex = 7;\n while (pieceIndex != 0 && swaps > 0) {\n swap = address[pieceIndex];\n address[pieceIndex--] = address[compress + swaps - 1];\n address[compress + --swaps] = swap;\n }\n } else if (pieceIndex != 8) return;\n return address;\n};\n\nvar findLongestZeroSequence = function (ipv6) {\n var maxIndex = null;\n var maxLength = 1;\n var currStart = null;\n var currLength = 0;\n var index = 0;\n for (; index < 8; index++) {\n if (ipv6[index] !== 0) {\n if (currLength > maxLength) {\n maxIndex = currStart;\n maxLength = currLength;\n }\n currStart = null;\n currLength = 0;\n } else {\n if (currStart === null) currStart = index;\n ++currLength;\n }\n }\n if (currLength > maxLength) {\n maxIndex = currStart;\n maxLength = currLength;\n }\n return maxIndex;\n};\n\nvar serializeHost = function (host) {\n var result, index, compress, ignore0;\n // ipv4\n if (typeof host == 'number') {\n result = [];\n for (index = 0; index < 4; index++) {\n result.unshift(host % 256);\n host = floor(host / 256);\n } return result.join('.');\n // ipv6\n } else if (typeof host == 'object') {\n result = '';\n compress = findLongestZeroSequence(host);\n for (index = 0; index < 8; index++) {\n if (ignore0 && host[index] === 0) continue;\n if (ignore0) ignore0 = false;\n if (compress === index) {\n result += index ? ':' : '::';\n ignore0 = true;\n } else {\n result += host[index].toString(16);\n if (index < 7) result += ':';\n }\n }\n return '[' + result + ']';\n } return host;\n};\n\nvar C0ControlPercentEncodeSet = {};\nvar fragmentPercentEncodeSet = assign({}, C0ControlPercentEncodeSet, {\n ' ': 1, '\"': 1, '<': 1, '>': 1, '`': 1\n});\nvar pathPercentEncodeSet = assign({}, fragmentPercentEncodeSet, {\n '#': 1, '?': 1, '{': 1, '}': 1\n});\nvar userinfoPercentEncodeSet = assign({}, pathPercentEncodeSet, {\n '/': 1, ':': 1, ';': 1, '=': 1, '@': 1, '[': 1, '\\\\': 1, ']': 1, '^': 1, '|': 1\n});\n\nvar percentEncode = function (char, set) {\n var code = codeAt(char, 0);\n return code > 0x20 && code < 0x7F && !has(set, char) ? char : encodeURIComponent(char);\n};\n\nvar specialSchemes = {\n ftp: 21,\n file: null,\n http: 80,\n https: 443,\n ws: 80,\n wss: 443\n};\n\nvar isSpecial = function (url) {\n return has(specialSchemes, url.scheme);\n};\n\nvar includesCredentials = function (url) {\n return url.username != '' || url.password != '';\n};\n\nvar cannotHaveUsernamePasswordPort = function (url) {\n return !url.host || url.cannotBeABaseURL || url.scheme == 'file';\n};\n\nvar isWindowsDriveLetter = function (string, normalized) {\n var second;\n return string.length == 2 && ALPHA.test(string.charAt(0))\n && ((second = string.charAt(1)) == ':' || (!normalized && second == '|'));\n};\n\nvar startsWithWindowsDriveLetter = function (string) {\n var third;\n return string.length > 1 && isWindowsDriveLetter(string.slice(0, 2)) && (\n string.length == 2 ||\n ((third = string.charAt(2)) === '/' || third === '\\\\' || third === '?' || third === '#')\n );\n};\n\nvar shortenURLsPath = function (url) {\n var path = url.path;\n var pathSize = path.length;\n if (pathSize && (url.scheme != 'file' || pathSize != 1 || !isWindowsDriveLetter(path[0], true))) {\n path.pop();\n }\n};\n\nvar isSingleDot = function (segment) {\n return segment === '.' || segment.toLowerCase() === '%2e';\n};\n\nvar isDoubleDot = function (segment) {\n segment = segment.toLowerCase();\n return segment === '..' || segment === '%2e.' || segment === '.%2e' || segment === '%2e%2e';\n};\n\n// States:\nvar SCHEME_START = {};\nvar SCHEME = {};\nvar NO_SCHEME = {};\nvar SPECIAL_RELATIVE_OR_AUTHORITY = {};\nvar PATH_OR_AUTHORITY = {};\nvar RELATIVE = {};\nvar RELATIVE_SLASH = {};\nvar SPECIAL_AUTHORITY_SLASHES = {};\nvar SPECIAL_AUTHORITY_IGNORE_SLASHES = {};\nvar AUTHORITY = {};\nvar HOST = {};\nvar HOSTNAME = {};\nvar PORT = {};\nvar FILE = {};\nvar FILE_SLASH = {};\nvar FILE_HOST = {};\nvar PATH_START = {};\nvar PATH = {};\nvar CANNOT_BE_A_BASE_URL_PATH = {};\nvar QUERY = {};\nvar FRAGMENT = {};\n\n// eslint-disable-next-line max-statements\nvar parseURL = function (url, input, stateOverride, base) {\n var state = stateOverride || SCHEME_START;\n var pointer = 0;\n var buffer = '';\n var seenAt = false;\n var seenBracket = false;\n var seenPasswordToken = false;\n var codePoints, char, bufferCodePoints, failure;\n\n if (!stateOverride) {\n url.scheme = '';\n url.username = '';\n url.password = '';\n url.host = null;\n url.port = null;\n url.path = [];\n url.query = null;\n url.fragment = null;\n url.cannotBeABaseURL = false;\n input = input.replace(LEADING_AND_TRAILING_C0_CONTROL_OR_SPACE, '');\n }\n\n input = input.replace(TAB_AND_NEW_LINE, '');\n\n codePoints = arrayFrom(input);\n\n while (pointer <= codePoints.length) {\n char = codePoints[pointer];\n switch (state) {\n case SCHEME_START:\n if (char && ALPHA.test(char)) {\n buffer += char.toLowerCase();\n state = SCHEME;\n } else if (!stateOverride) {\n state = NO_SCHEME;\n continue;\n } else return INVALID_SCHEME;\n break;\n\n case SCHEME:\n if (char && (ALPHANUMERIC.test(char) || char == '+' || char == '-' || char == '.')) {\n buffer += char.toLowerCase();\n } else if (char == ':') {\n if (stateOverride && (\n (isSpecial(url) != has(specialSchemes, buffer)) ||\n (buffer == 'file' && (includesCredentials(url) || url.port !== null)) ||\n (url.scheme == 'file' && !url.host)\n )) return;\n url.scheme = buffer;\n if (stateOverride) {\n if (isSpecial(url) && specialSchemes[url.scheme] == url.port) url.port = null;\n return;\n }\n buffer = '';\n if (url.scheme == 'file') {\n state = FILE;\n } else if (isSpecial(url) && base && base.scheme == url.scheme) {\n state = SPECIAL_RELATIVE_OR_AUTHORITY;\n } else if (isSpecial(url)) {\n state = SPECIAL_AUTHORITY_SLASHES;\n } else if (codePoints[pointer + 1] == '/') {\n state = PATH_OR_AUTHORITY;\n pointer++;\n } else {\n url.cannotBeABaseURL = true;\n url.path.push('');\n state = CANNOT_BE_A_BASE_URL_PATH;\n }\n } else if (!stateOverride) {\n buffer = '';\n state = NO_SCHEME;\n pointer = 0;\n continue;\n } else return INVALID_SCHEME;\n break;\n\n case NO_SCHEME:\n if (!base || (base.cannotBeABaseURL && char != '#')) return INVALID_SCHEME;\n if (base.cannotBeABaseURL && char == '#') {\n url.scheme = base.scheme;\n url.path = base.path.slice();\n url.query = base.query;\n url.fragment = '';\n url.cannotBeABaseURL = true;\n state = FRAGMENT;\n break;\n }\n state = base.scheme == 'file' ? FILE : RELATIVE;\n continue;\n\n case SPECIAL_RELATIVE_OR_AUTHORITY:\n if (char == '/' && codePoints[pointer + 1] == '/') {\n state = SPECIAL_AUTHORITY_IGNORE_SLASHES;\n pointer++;\n } else {\n state = RELATIVE;\n continue;\n } break;\n\n case PATH_OR_AUTHORITY:\n if (char == '/') {\n state = AUTHORITY;\n break;\n } else {\n state = PATH;\n continue;\n }\n\n case RELATIVE:\n url.scheme = base.scheme;\n if (char == EOF) {\n url.username = base.username;\n url.password = base.password;\n url.host = base.host;\n url.port = base.port;\n url.path = base.path.slice();\n url.query = base.query;\n } else if (char == '/' || (char == '\\\\' && isSpecial(url))) {\n state = RELATIVE_SLASH;\n } else if (char == '?') {\n url.username = base.username;\n url.password = base.password;\n url.host = base.host;\n url.port = base.port;\n url.path = base.path.slice();\n url.query = '';\n state = QUERY;\n } else if (char == '#') {\n url.username = base.username;\n url.password = base.password;\n url.host = base.host;\n url.port = base.port;\n url.path = base.path.slice();\n url.query = base.query;\n url.fragment = '';\n state = FRAGMENT;\n } else {\n url.username = base.username;\n url.password = base.password;\n url.host = base.host;\n url.port = base.port;\n url.path = base.path.slice();\n url.path.pop();\n state = PATH;\n continue;\n } break;\n\n case RELATIVE_SLASH:\n if (isSpecial(url) && (char == '/' || char == '\\\\')) {\n state = SPECIAL_AUTHORITY_IGNORE_SLASHES;\n } else if (char == '/') {\n state = AUTHORITY;\n } else {\n url.username = base.username;\n url.password = base.password;\n url.host = base.host;\n url.port = base.port;\n state = PATH;\n continue;\n } break;\n\n case SPECIAL_AUTHORITY_SLASHES:\n state = SPECIAL_AUTHORITY_IGNORE_SLASHES;\n if (char != '/' || buffer.charAt(pointer + 1) != '/') continue;\n pointer++;\n break;\n\n case SPECIAL_AUTHORITY_IGNORE_SLASHES:\n if (char != '/' && char != '\\\\') {\n state = AUTHORITY;\n continue;\n } break;\n\n case AUTHORITY:\n if (char == '@') {\n if (seenAt) buffer = '%40' + buffer;\n seenAt = true;\n bufferCodePoints = arrayFrom(buffer);\n for (var i = 0; i < bufferCodePoints.length; i++) {\n var codePoint = bufferCodePoints[i];\n if (codePoint == ':' && !seenPasswordToken) {\n seenPasswordToken = true;\n continue;\n }\n var encodedCodePoints = percentEncode(codePoint, userinfoPercentEncodeSet);\n if (seenPasswordToken) url.password += encodedCodePoints;\n else url.username += encodedCodePoints;\n }\n buffer = '';\n } else if (\n char == EOF || char == '/' || char == '?' || char == '#' ||\n (char == '\\\\' && isSpecial(url))\n ) {\n if (seenAt && buffer == '') return INVALID_AUTHORITY;\n pointer -= arrayFrom(buffer).length + 1;\n buffer = '';\n state = HOST;\n } else buffer += char;\n break;\n\n case HOST:\n case HOSTNAME:\n if (stateOverride && url.scheme == 'file') {\n state = FILE_HOST;\n continue;\n } else if (char == ':' && !seenBracket) {\n if (buffer == '') return INVALID_HOST;\n failure = parseHost(url, buffer);\n if (failure) return failure;\n buffer = '';\n state = PORT;\n if (stateOverride == HOSTNAME) return;\n } else if (\n char == EOF || char == '/' || char == '?' || char == '#' ||\n (char == '\\\\' && isSpecial(url))\n ) {\n if (isSpecial(url) && buffer == '') return INVALID_HOST;\n if (stateOverride && buffer == '' && (includesCredentials(url) || url.port !== null)) return;\n failure = parseHost(url, buffer);\n if (failure) return failure;\n buffer = '';\n state = PATH_START;\n if (stateOverride) return;\n continue;\n } else {\n if (char == '[') seenBracket = true;\n else if (char == ']') seenBracket = false;\n buffer += char;\n } break;\n\n case PORT:\n if (DIGIT.test(char)) {\n buffer += char;\n } else if (\n char == EOF || char == '/' || char == '?' || char == '#' ||\n (char == '\\\\' && isSpecial(url)) ||\n stateOverride\n ) {\n if (buffer != '') {\n var port = parseInt(buffer, 10);\n if (port > 0xFFFF) return INVALID_PORT;\n url.port = (isSpecial(url) && port === specialSchemes[url.scheme]) ? null : port;\n buffer = '';\n }\n if (stateOverride) return;\n state = PATH_START;\n continue;\n } else return INVALID_PORT;\n break;\n\n case FILE:\n url.scheme = 'file';\n if (char == '/' || char == '\\\\') state = FILE_SLASH;\n else if (base && base.scheme == 'file') {\n if (char == EOF) {\n url.host = base.host;\n url.path = base.path.slice();\n url.query = base.query;\n } else if (char == '?') {\n url.host = base.host;\n url.path = base.path.slice();\n url.query = '';\n state = QUERY;\n } else if (char == '#') {\n url.host = base.host;\n url.path = base.path.slice();\n url.query = base.query;\n url.fragment = '';\n state = FRAGMENT;\n } else {\n if (!startsWithWindowsDriveLetter(codePoints.slice(pointer).join(''))) {\n url.host = base.host;\n url.path = base.path.slice();\n shortenURLsPath(url);\n }\n state = PATH;\n continue;\n }\n } else {\n state = PATH;\n continue;\n } break;\n\n case FILE_SLASH:\n if (char == '/' || char == '\\\\') {\n state = FILE_HOST;\n break;\n }\n if (base && base.scheme == 'file' && !startsWithWindowsDriveLetter(codePoints.slice(pointer).join(''))) {\n if (isWindowsDriveLetter(base.path[0], true)) url.path.push(base.path[0]);\n else url.host = base.host;\n }\n state = PATH;\n continue;\n\n case FILE_HOST:\n if (char == EOF || char == '/' || char == '\\\\' || char == '?' || char == '#') {\n if (!stateOverride && isWindowsDriveLetter(buffer)) {\n state = PATH;\n } else if (buffer == '') {\n url.host = '';\n if (stateOverride) return;\n state = PATH_START;\n } else {\n failure = parseHost(url, buffer);\n if (failure) return failure;\n if (url.host == 'localhost') url.host = '';\n if (stateOverride) return;\n buffer = '';\n state = PATH_START;\n } continue;\n } else buffer += char;\n break;\n\n case PATH_START:\n if (isSpecial(url)) {\n state = PATH;\n if (char != '/' && char != '\\\\') continue;\n } else if (!stateOverride && char == '?') {\n url.query = '';\n state = QUERY;\n } else if (!stateOverride && char == '#') {\n url.fragment = '';\n state = FRAGMENT;\n } else if (char != EOF) {\n state = PATH;\n if (char != '/') continue;\n } break;\n\n case PATH:\n if (\n char == EOF || char == '/' ||\n (char == '\\\\' && isSpecial(url)) ||\n (!stateOverride && (char == '?' || char == '#'))\n ) {\n if (isDoubleDot(buffer)) {\n shortenURLsPath(url);\n if (char != '/' && !(char == '\\\\' && isSpecial(url))) {\n url.path.push('');\n }\n } else if (isSingleDot(buffer)) {\n if (char != '/' && !(char == '\\\\' && isSpecial(url))) {\n url.path.push('');\n }\n } else {\n if (url.scheme == 'file' && !url.path.length && isWindowsDriveLetter(buffer)) {\n if (url.host) url.host = '';\n buffer = buffer.charAt(0) + ':'; // normalize windows drive letter\n }\n url.path.push(buffer);\n }\n buffer = '';\n if (url.scheme == 'file' && (char == EOF || char == '?' || char == '#')) {\n while (url.path.length > 1 && url.path[0] === '') {\n url.path.shift();\n }\n }\n if (char == '?') {\n url.query = '';\n state = QUERY;\n } else if (char == '#') {\n url.fragment = '';\n state = FRAGMENT;\n }\n } else {\n buffer += percentEncode(char, pathPercentEncodeSet);\n } break;\n\n case CANNOT_BE_A_BASE_URL_PATH:\n if (char == '?') {\n url.query = '';\n state = QUERY;\n } else if (char == '#') {\n url.fragment = '';\n state = FRAGMENT;\n } else if (char != EOF) {\n url.path[0] += percentEncode(char, C0ControlPercentEncodeSet);\n } break;\n\n case QUERY:\n if (!stateOverride && char == '#') {\n url.fragment = '';\n state = FRAGMENT;\n } else if (char != EOF) {\n if (char == \"'\" && isSpecial(url)) url.query += '%27';\n else if (char == '#') url.query += '%23';\n else url.query += percentEncode(char, C0ControlPercentEncodeSet);\n } break;\n\n case FRAGMENT:\n if (char != EOF) url.fragment += percentEncode(char, fragmentPercentEncodeSet);\n break;\n }\n\n pointer++;\n }\n};\n\n// `URL` constructor\n// https://url.spec.whatwg.org/#url-class\nvar URLConstructor = function URL(url /* , base */) {\n var that = anInstance(this, URLConstructor, 'URL');\n var base = arguments.length > 1 ? arguments[1] : undefined;\n var urlString = String(url);\n var state = setInternalState(that, { type: 'URL' });\n var baseState, failure;\n if (base !== undefined) {\n if (base instanceof URLConstructor) baseState = getInternalURLState(base);\n else {\n failure = parseURL(baseState = {}, String(base));\n if (failure) throw TypeError(failure);\n }\n }\n failure = parseURL(state, urlString, null, baseState);\n if (failure) throw TypeError(failure);\n var searchParams = state.searchParams = new URLSearchParams();\n var searchParamsState = getInternalSearchParamsState(searchParams);\n searchParamsState.updateSearchParams(state.query);\n searchParamsState.updateURL = function () {\n state.query = String(searchParams) || null;\n };\n if (!DESCRIPTORS) {\n that.href = serializeURL.call(that);\n that.origin = getOrigin.call(that);\n that.protocol = getProtocol.call(that);\n that.username = getUsername.call(that);\n that.password = getPassword.call(that);\n that.host = getHost.call(that);\n that.hostname = getHostname.call(that);\n that.port = getPort.call(that);\n that.pathname = getPathname.call(that);\n that.search = getSearch.call(that);\n that.searchParams = getSearchParams.call(that);\n that.hash = getHash.call(that);\n }\n};\n\nvar URLPrototype = URLConstructor.prototype;\n\nvar serializeURL = function () {\n var url = getInternalURLState(this);\n var scheme = url.scheme;\n var username = url.username;\n var password = url.password;\n var host = url.host;\n var port = url.port;\n var path = url.path;\n var query = url.query;\n var fragment = url.fragment;\n var output = scheme + ':';\n if (host !== null) {\n output += '//';\n if (includesCredentials(url)) {\n output += username + (password ? ':' + password : '') + '@';\n }\n output += serializeHost(host);\n if (port !== null) output += ':' + port;\n } else if (scheme == 'file') output += '//';\n output += url.cannotBeABaseURL ? path[0] : path.length ? '/' + path.join('/') : '';\n if (query !== null) output += '?' + query;\n if (fragment !== null) output += '#' + fragment;\n return output;\n};\n\nvar getOrigin = function () {\n var url = getInternalURLState(this);\n var scheme = url.scheme;\n var port = url.port;\n if (scheme == 'blob') try {\n return new URL(scheme.path[0]).origin;\n } catch (error) {\n return 'null';\n }\n if (scheme == 'file' || !isSpecial(url)) return 'null';\n return scheme + '://' + serializeHost(url.host) + (port !== null ? ':' + port : '');\n};\n\nvar getProtocol = function () {\n return getInternalURLState(this).scheme + ':';\n};\n\nvar getUsername = function () {\n return getInternalURLState(this).username;\n};\n\nvar getPassword = function () {\n return getInternalURLState(this).password;\n};\n\nvar getHost = function () {\n var url = getInternalURLState(this);\n var host = url.host;\n var port = url.port;\n return host === null ? ''\n : port === null ? serializeHost(host)\n : serializeHost(host) + ':' + port;\n};\n\nvar getHostname = function () {\n var host = getInternalURLState(this).host;\n return host === null ? '' : serializeHost(host);\n};\n\nvar getPort = function () {\n var port = getInternalURLState(this).port;\n return port === null ? '' : String(port);\n};\n\nvar getPathname = function () {\n var url = getInternalURLState(this);\n var path = url.path;\n return url.cannotBeABaseURL ? path[0] : path.length ? '/' + path.join('/') : '';\n};\n\nvar getSearch = function () {\n var query = getInternalURLState(this).query;\n return query ? '?' + query : '';\n};\n\nvar getSearchParams = function () {\n return getInternalURLState(this).searchParams;\n};\n\nvar getHash = function () {\n var fragment = getInternalURLState(this).fragment;\n return fragment ? '#' + fragment : '';\n};\n\nvar accessorDescriptor = function (getter, setter) {\n return { get: getter, set: setter, configurable: true, enumerable: true };\n};\n\nif (DESCRIPTORS) {\n defineProperties(URLPrototype, {\n // `URL.prototype.href` accessors pair\n // https://url.spec.whatwg.org/#dom-url-href\n href: accessorDescriptor(serializeURL, function (href) {\n var url = getInternalURLState(this);\n var urlString = String(href);\n var failure = parseURL(url, urlString);\n if (failure) throw TypeError(failure);\n getInternalSearchParamsState(url.searchParams).updateSearchParams(url.query);\n }),\n // `URL.prototype.origin` getter\n // https://url.spec.whatwg.org/#dom-url-origin\n origin: accessorDescriptor(getOrigin),\n // `URL.prototype.protocol` accessors pair\n // https://url.spec.whatwg.org/#dom-url-protocol\n protocol: accessorDescriptor(getProtocol, function (protocol) {\n var url = getInternalURLState(this);\n parseURL(url, String(protocol) + ':', SCHEME_START);\n }),\n // `URL.prototype.username` accessors pair\n // https://url.spec.whatwg.org/#dom-url-username\n username: accessorDescriptor(getUsername, function (username) {\n var url = getInternalURLState(this);\n var codePoints = arrayFrom(String(username));\n if (cannotHaveUsernamePasswordPort(url)) return;\n url.username = '';\n for (var i = 0; i < codePoints.length; i++) {\n url.username += percentEncode(codePoints[i], userinfoPercentEncodeSet);\n }\n }),\n // `URL.prototype.password` accessors pair\n // https://url.spec.whatwg.org/#dom-url-password\n password: accessorDescriptor(getPassword, function (password) {\n var url = getInternalURLState(this);\n var codePoints = arrayFrom(String(password));\n if (cannotHaveUsernamePasswordPort(url)) return;\n url.password = '';\n for (var i = 0; i < codePoints.length; i++) {\n url.password += percentEncode(codePoints[i], userinfoPercentEncodeSet);\n }\n }),\n // `URL.prototype.host` accessors pair\n // https://url.spec.whatwg.org/#dom-url-host\n host: accessorDescriptor(getHost, function (host) {\n var url = getInternalURLState(this);\n if (url.cannotBeABaseURL) return;\n parseURL(url, String(host), HOST);\n }),\n // `URL.prototype.hostname` accessors pair\n // https://url.spec.whatwg.org/#dom-url-hostname\n hostname: accessorDescriptor(getHostname, function (hostname) {\n var url = getInternalURLState(this);\n if (url.cannotBeABaseURL) return;\n parseURL(url, String(hostname), HOSTNAME);\n }),\n // `URL.prototype.port` accessors pair\n // https://url.spec.whatwg.org/#dom-url-port\n port: accessorDescriptor(getPort, function (port) {\n var url = getInternalURLState(this);\n if (cannotHaveUsernamePasswordPort(url)) return;\n port = String(port);\n if (port == '') url.port = null;\n else parseURL(url, port, PORT);\n }),\n // `URL.prototype.pathname` accessors pair\n // https://url.spec.whatwg.org/#dom-url-pathname\n pathname: accessorDescriptor(getPathname, function (pathname) {\n var url = getInternalURLState(this);\n if (url.cannotBeABaseURL) return;\n url.path = [];\n parseURL(url, pathname + '', PATH_START);\n }),\n // `URL.prototype.search` accessors pair\n // https://url.spec.whatwg.org/#dom-url-search\n search: accessorDescriptor(getSearch, function (search) {\n var url = getInternalURLState(this);\n search = String(search);\n if (search == '') {\n url.query = null;\n } else {\n if ('?' == search.charAt(0)) search = search.slice(1);\n url.query = '';\n parseURL(url, search, QUERY);\n }\n getInternalSearchParamsState(url.searchParams).updateSearchParams(url.query);\n }),\n // `URL.prototype.searchParams` getter\n // https://url.spec.whatwg.org/#dom-url-searchparams\n searchParams: accessorDescriptor(getSearchParams),\n // `URL.prototype.hash` accessors pair\n // https://url.spec.whatwg.org/#dom-url-hash\n hash: accessorDescriptor(getHash, function (hash) {\n var url = getInternalURLState(this);\n hash = String(hash);\n if (hash == '') {\n url.fragment = null;\n return;\n }\n if ('#' == hash.charAt(0)) hash = hash.slice(1);\n url.fragment = '';\n parseURL(url, hash, FRAGMENT);\n })\n });\n}\n\n// `URL.prototype.toJSON` method\n// https://url.spec.whatwg.org/#dom-url-tojson\nredefine(URLPrototype, 'toJSON', function toJSON() {\n return serializeURL.call(this);\n}, { enumerable: true });\n\n// `URL.prototype.toString` method\n// https://url.spec.whatwg.org/#URL-stringification-behavior\nredefine(URLPrototype, 'toString', function toString() {\n return serializeURL.call(this);\n}, { enumerable: true });\n\nif (NativeURL) {\n var nativeCreateObjectURL = NativeURL.createObjectURL;\n var nativeRevokeObjectURL = NativeURL.revokeObjectURL;\n // `URL.createObjectURL` method\n // https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL\n // eslint-disable-next-line no-unused-vars\n if (nativeCreateObjectURL) redefine(URLConstructor, 'createObjectURL', function createObjectURL(blob) {\n return nativeCreateObjectURL.apply(NativeURL, arguments);\n });\n // `URL.revokeObjectURL` method\n // https://developer.mozilla.org/en-US/docs/Web/API/URL/revokeObjectURL\n // eslint-disable-next-line no-unused-vars\n if (nativeRevokeObjectURL) redefine(URLConstructor, 'revokeObjectURL', function revokeObjectURL(url) {\n return nativeRevokeObjectURL.apply(NativeURL, arguments);\n });\n}\n\nsetToStringTag(URLConstructor, 'URL');\n\n$({ global: true, forced: !USE_NATIVE_URL, sham: !DESCRIPTORS }, {\n URL: URLConstructor\n});\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\nvar runtime = (function (exports) {\n \"use strict\";\n\n var Op = Object.prototype;\n var hasOwn = Op.hasOwnProperty;\n var undefined; // More compressible than void 0.\n var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n function define(obj, key, value) {\n Object.defineProperty(obj, key, {\n value: value,\n enumerable: true,\n configurable: true,\n writable: true\n });\n return obj[key];\n }\n try {\n // IE 8 has a broken Object.defineProperty that only works on DOM objects.\n define({}, \"\");\n } catch (err) {\n define = function(obj, key, value) {\n return obj[key] = value;\n };\n }\n\n function wrap(innerFn, outerFn, self, tryLocsList) {\n // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n var generator = Object.create(protoGenerator.prototype);\n var context = new Context(tryLocsList || []);\n\n // The ._invoke method unifies the implementations of the .next,\n // .throw, and .return methods.\n generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n return generator;\n }\n exports.wrap = wrap;\n\n // Try/catch helper to minimize deoptimizations. Returns a completion\n // record like context.tryEntries[i].completion. This interface could\n // have been (and was previously) designed to take a closure to be\n // invoked without arguments, but in all the cases we care about we\n // already have an existing method we want to call, so there's no need\n // to create a new function object. We can even get away with assuming\n // the method takes exactly one argument, since that happens to be true\n // in every case, so we don't have to touch the arguments object. The\n // only additional allocation required is the completion record, which\n // has a stable shape and so hopefully should be cheap to allocate.\n function tryCatch(fn, obj, arg) {\n try {\n return { type: \"normal\", arg: fn.call(obj, arg) };\n } catch (err) {\n return { type: \"throw\", arg: err };\n }\n }\n\n var GenStateSuspendedStart = \"suspendedStart\";\n var GenStateSuspendedYield = \"suspendedYield\";\n var GenStateExecuting = \"executing\";\n var GenStateCompleted = \"completed\";\n\n // Returning this object from the innerFn has the same effect as\n // breaking out of the dispatch switch statement.\n var ContinueSentinel = {};\n\n // Dummy constructor functions that we use as the .constructor and\n // .constructor.prototype properties for functions that return Generator\n // objects. For full spec compliance, you may wish to configure your\n // minifier not to mangle the names of these two functions.\n function Generator() {}\n function GeneratorFunction() {}\n function GeneratorFunctionPrototype() {}\n\n // This is a polyfill for %IteratorPrototype% for environments that\n // don't natively support it.\n var IteratorPrototype = {};\n IteratorPrototype[iteratorSymbol] = function () {\n return this;\n };\n\n var getProto = Object.getPrototypeOf;\n var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n if (NativeIteratorPrototype &&\n NativeIteratorPrototype !== Op &&\n hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n // This environment has a native %IteratorPrototype%; use it instead\n // of the polyfill.\n IteratorPrototype = NativeIteratorPrototype;\n }\n\n var Gp = GeneratorFunctionPrototype.prototype =\n Generator.prototype = Object.create(IteratorPrototype);\n GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n GeneratorFunctionPrototype.constructor = GeneratorFunction;\n GeneratorFunction.displayName = define(\n GeneratorFunctionPrototype,\n toStringTagSymbol,\n \"GeneratorFunction\"\n );\n\n // Helper for defining the .next, .throw, and .return methods of the\n // Iterator interface in terms of a single ._invoke method.\n function defineIteratorMethods(prototype) {\n [\"next\", \"throw\", \"return\"].forEach(function(method) {\n define(prototype, method, function(arg) {\n return this._invoke(method, arg);\n });\n });\n }\n\n exports.isGeneratorFunction = function(genFun) {\n var ctor = typeof genFun === \"function\" && genFun.constructor;\n return ctor\n ? ctor === GeneratorFunction ||\n // For the native GeneratorFunction constructor, the best we can\n // do is to check its .name property.\n (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n : false;\n };\n\n exports.mark = function(genFun) {\n if (Object.setPrototypeOf) {\n Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n } else {\n genFun.__proto__ = GeneratorFunctionPrototype;\n define(genFun, toStringTagSymbol, \"GeneratorFunction\");\n }\n genFun.prototype = Object.create(Gp);\n return genFun;\n };\n\n // Within the body of any async function, `await x` is transformed to\n // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n // meant to be awaited.\n exports.awrap = function(arg) {\n return { __await: arg };\n };\n\n function AsyncIterator(generator, PromiseImpl) {\n function invoke(method, arg, resolve, reject) {\n var record = tryCatch(generator[method], generator, arg);\n if (record.type === \"throw\") {\n reject(record.arg);\n } else {\n var result = record.arg;\n var value = result.value;\n if (value &&\n typeof value === \"object\" &&\n hasOwn.call(value, \"__await\")) {\n return PromiseImpl.resolve(value.__await).then(function(value) {\n invoke(\"next\", value, resolve, reject);\n }, function(err) {\n invoke(\"throw\", err, resolve, reject);\n });\n }\n\n return PromiseImpl.resolve(value).then(function(unwrapped) {\n // When a yielded Promise is resolved, its final value becomes\n // the .value of the Promise<{value,done}> result for the\n // current iteration.\n result.value = unwrapped;\n resolve(result);\n }, function(error) {\n // If a rejected Promise was yielded, throw the rejection back\n // into the async generator function so it can be handled there.\n return invoke(\"throw\", error, resolve, reject);\n });\n }\n }\n\n var previousPromise;\n\n function enqueue(method, arg) {\n function callInvokeWithMethodAndArg() {\n return new PromiseImpl(function(resolve, reject) {\n invoke(method, arg, resolve, reject);\n });\n }\n\n return previousPromise =\n // If enqueue has been called before, then we want to wait until\n // all previous Promises have been resolved before calling invoke,\n // so that results are always delivered in the correct order. If\n // enqueue has not been called before, then it is important to\n // call invoke immediately, without waiting on a callback to fire,\n // so that the async generator function has the opportunity to do\n // any necessary setup in a predictable way. This predictability\n // is why the Promise constructor synchronously invokes its\n // executor callback, and why async functions synchronously\n // execute code before the first await. Since we implement simple\n // async functions in terms of async generators, it is especially\n // important to get this right, even though it requires care.\n previousPromise ? previousPromise.then(\n callInvokeWithMethodAndArg,\n // Avoid propagating failures to Promises returned by later\n // invocations of the iterator.\n callInvokeWithMethodAndArg\n ) : callInvokeWithMethodAndArg();\n }\n\n // Define the unified helper method that is used to implement .next,\n // .throw, and .return (see defineIteratorMethods).\n this._invoke = enqueue;\n }\n\n defineIteratorMethods(AsyncIterator.prototype);\n AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n return this;\n };\n exports.AsyncIterator = AsyncIterator;\n\n // Note that simple async functions are implemented on top of\n // AsyncIterator objects; they just return a Promise for the value of\n // the final result produced by the iterator.\n exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {\n if (PromiseImpl === void 0) PromiseImpl = Promise;\n\n var iter = new AsyncIterator(\n wrap(innerFn, outerFn, self, tryLocsList),\n PromiseImpl\n );\n\n return exports.isGeneratorFunction(outerFn)\n ? iter // If outerFn is a generator, return the full iterator.\n : iter.next().then(function(result) {\n return result.done ? result.value : iter.next();\n });\n };\n\n function makeInvokeMethod(innerFn, self, context) {\n var state = GenStateSuspendedStart;\n\n return function invoke(method, arg) {\n if (state === GenStateExecuting) {\n throw new Error(\"Generator is already running\");\n }\n\n if (state === GenStateCompleted) {\n if (method === \"throw\") {\n throw arg;\n }\n\n // Be forgiving, per 25.3.3.3.3 of the spec:\n // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n return doneResult();\n }\n\n context.method = method;\n context.arg = arg;\n\n while (true) {\n var delegate = context.delegate;\n if (delegate) {\n var delegateResult = maybeInvokeDelegate(delegate, context);\n if (delegateResult) {\n if (delegateResult === ContinueSentinel) continue;\n return delegateResult;\n }\n }\n\n if (context.method === \"next\") {\n // Setting context._sent for legacy support of Babel's\n // function.sent implementation.\n context.sent = context._sent = context.arg;\n\n } else if (context.method === \"throw\") {\n if (state === GenStateSuspendedStart) {\n state = GenStateCompleted;\n throw context.arg;\n }\n\n context.dispatchException(context.arg);\n\n } else if (context.method === \"return\") {\n context.abrupt(\"return\", context.arg);\n }\n\n state = GenStateExecuting;\n\n var record = tryCatch(innerFn, self, context);\n if (record.type === \"normal\") {\n // If an exception is thrown from innerFn, we leave state ===\n // GenStateExecuting and loop back for another invocation.\n state = context.done\n ? GenStateCompleted\n : GenStateSuspendedYield;\n\n if (record.arg === ContinueSentinel) {\n continue;\n }\n\n return {\n value: record.arg,\n done: context.done\n };\n\n } else if (record.type === \"throw\") {\n state = GenStateCompleted;\n // Dispatch the exception by looping back around to the\n // context.dispatchException(context.arg) call above.\n context.method = \"throw\";\n context.arg = record.arg;\n }\n }\n };\n }\n\n // Call delegate.iterator[context.method](context.arg) and handle the\n // result, either by returning a { value, done } result from the\n // delegate iterator, or by modifying context.method and context.arg,\n // setting context.delegate to null, and returning the ContinueSentinel.\n function maybeInvokeDelegate(delegate, context) {\n var method = delegate.iterator[context.method];\n if (method === undefined) {\n // A .throw or .return when the delegate iterator has no .throw\n // method always terminates the yield* loop.\n context.delegate = null;\n\n if (context.method === \"throw\") {\n // Note: [\"return\"] must be used for ES3 parsing compatibility.\n if (delegate.iterator[\"return\"]) {\n // If the delegate iterator has a return method, give it a\n // chance to clean up.\n context.method = \"return\";\n context.arg = undefined;\n maybeInvokeDelegate(delegate, context);\n\n if (context.method === \"throw\") {\n // If maybeInvokeDelegate(context) changed context.method from\n // \"return\" to \"throw\", let that override the TypeError below.\n return ContinueSentinel;\n }\n }\n\n context.method = \"throw\";\n context.arg = new TypeError(\n \"The iterator does not provide a 'throw' method\");\n }\n\n return ContinueSentinel;\n }\n\n var record = tryCatch(method, delegate.iterator, context.arg);\n\n if (record.type === \"throw\") {\n context.method = \"throw\";\n context.arg = record.arg;\n context.delegate = null;\n return ContinueSentinel;\n }\n\n var info = record.arg;\n\n if (! info) {\n context.method = \"throw\";\n context.arg = new TypeError(\"iterator result is not an object\");\n context.delegate = null;\n return ContinueSentinel;\n }\n\n if (info.done) {\n // Assign the result of the finished delegate to the temporary\n // variable specified by delegate.resultName (see delegateYield).\n context[delegate.resultName] = info.value;\n\n // Resume execution at the desired location (see delegateYield).\n context.next = delegate.nextLoc;\n\n // If context.method was \"throw\" but the delegate handled the\n // exception, let the outer generator proceed normally. If\n // context.method was \"next\", forget context.arg since it has been\n // \"consumed\" by the delegate iterator. If context.method was\n // \"return\", allow the original .return call to continue in the\n // outer generator.\n if (context.method !== \"return\") {\n context.method = \"next\";\n context.arg = undefined;\n }\n\n } else {\n // Re-yield the result returned by the delegate method.\n return info;\n }\n\n // The delegate iterator is finished, so forget it and continue with\n // the outer generator.\n context.delegate = null;\n return ContinueSentinel;\n }\n\n // Define Generator.prototype.{next,throw,return} in terms of the\n // unified ._invoke helper method.\n defineIteratorMethods(Gp);\n\n define(Gp, toStringTagSymbol, \"Generator\");\n\n // A Generator should always return itself as the iterator object when the\n // @@iterator function is called on it. Some browsers' implementations of the\n // iterator prototype chain incorrectly implement this, causing the Generator\n // object to not be returned from this call. This ensures that doesn't happen.\n // See https://github.com/facebook/regenerator/issues/274 for more details.\n Gp[iteratorSymbol] = function() {\n return this;\n };\n\n Gp.toString = function() {\n return \"[object Generator]\";\n };\n\n function pushTryEntry(locs) {\n var entry = { tryLoc: locs[0] };\n\n if (1 in locs) {\n entry.catchLoc = locs[1];\n }\n\n if (2 in locs) {\n entry.finallyLoc = locs[2];\n entry.afterLoc = locs[3];\n }\n\n this.tryEntries.push(entry);\n }\n\n function resetTryEntry(entry) {\n var record = entry.completion || {};\n record.type = \"normal\";\n delete record.arg;\n entry.completion = record;\n }\n\n function Context(tryLocsList) {\n // The root entry object (effectively a try statement without a catch\n // or a finally block) gives us a place to store values thrown from\n // locations where there is no enclosing try statement.\n this.tryEntries = [{ tryLoc: \"root\" }];\n tryLocsList.forEach(pushTryEntry, this);\n this.reset(true);\n }\n\n exports.keys = function(object) {\n var keys = [];\n for (var key in object) {\n keys.push(key);\n }\n keys.reverse();\n\n // Rather than returning an object with a next method, we keep\n // things simple and return the next function itself.\n return function next() {\n while (keys.length) {\n var key = keys.pop();\n if (key in object) {\n next.value = key;\n next.done = false;\n return next;\n }\n }\n\n // To avoid creating an additional object, we just hang the .value\n // and .done properties off the next function object itself. This\n // also ensures that the minifier will not anonymize the function.\n next.done = true;\n return next;\n };\n };\n\n function values(iterable) {\n if (iterable) {\n var iteratorMethod = iterable[iteratorSymbol];\n if (iteratorMethod) {\n return iteratorMethod.call(iterable);\n }\n\n if (typeof iterable.next === \"function\") {\n return iterable;\n }\n\n if (!isNaN(iterable.length)) {\n var i = -1, next = function next() {\n while (++i < iterable.length) {\n if (hasOwn.call(iterable, i)) {\n next.value = iterable[i];\n next.done = false;\n return next;\n }\n }\n\n next.value = undefined;\n next.done = true;\n\n return next;\n };\n\n return next.next = next;\n }\n }\n\n // Return an iterator with no values.\n return { next: doneResult };\n }\n exports.values = values;\n\n function doneResult() {\n return { value: undefined, done: true };\n }\n\n Context.prototype = {\n constructor: Context,\n\n reset: function(skipTempReset) {\n this.prev = 0;\n this.next = 0;\n // Resetting context._sent for legacy support of Babel's\n // function.sent implementation.\n this.sent = this._sent = undefined;\n this.done = false;\n this.delegate = null;\n\n this.method = \"next\";\n this.arg = undefined;\n\n this.tryEntries.forEach(resetTryEntry);\n\n if (!skipTempReset) {\n for (var name in this) {\n // Not sure about the optimal order of these conditions:\n if (name.charAt(0) === \"t\" &&\n hasOwn.call(this, name) &&\n !isNaN(+name.slice(1))) {\n this[name] = undefined;\n }\n }\n }\n },\n\n stop: function() {\n this.done = true;\n\n var rootEntry = this.tryEntries[0];\n var rootRecord = rootEntry.completion;\n if (rootRecord.type === \"throw\") {\n throw rootRecord.arg;\n }\n\n return this.rval;\n },\n\n dispatchException: function(exception) {\n if (this.done) {\n throw exception;\n }\n\n var context = this;\n function handle(loc, caught) {\n record.type = \"throw\";\n record.arg = exception;\n context.next = loc;\n\n if (caught) {\n // If the dispatched exception was caught by a catch block,\n // then let that catch block handle the exception normally.\n context.method = \"next\";\n context.arg = undefined;\n }\n\n return !! caught;\n }\n\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n var record = entry.completion;\n\n if (entry.tryLoc === \"root\") {\n // Exception thrown outside of any try block that could handle\n // it, so set the completion value of the entire function to\n // throw the exception.\n return handle(\"end\");\n }\n\n if (entry.tryLoc <= this.prev) {\n var hasCatch = hasOwn.call(entry, \"catchLoc\");\n var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n if (hasCatch && hasFinally) {\n if (this.prev < entry.catchLoc) {\n return handle(entry.catchLoc, true);\n } else if (this.prev < entry.finallyLoc) {\n return handle(entry.finallyLoc);\n }\n\n } else if (hasCatch) {\n if (this.prev < entry.catchLoc) {\n return handle(entry.catchLoc, true);\n }\n\n } else if (hasFinally) {\n if (this.prev < entry.finallyLoc) {\n return handle(entry.finallyLoc);\n }\n\n } else {\n throw new Error(\"try statement without catch or finally\");\n }\n }\n }\n },\n\n abrupt: function(type, arg) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.tryLoc <= this.prev &&\n hasOwn.call(entry, \"finallyLoc\") &&\n this.prev < entry.finallyLoc) {\n var finallyEntry = entry;\n break;\n }\n }\n\n if (finallyEntry &&\n (type === \"break\" ||\n type === \"continue\") &&\n finallyEntry.tryLoc <= arg &&\n arg <= finallyEntry.finallyLoc) {\n // Ignore the finally entry if control is not jumping to a\n // location outside the try/catch block.\n finallyEntry = null;\n }\n\n var record = finallyEntry ? finallyEntry.completion : {};\n record.type = type;\n record.arg = arg;\n\n if (finallyEntry) {\n this.method = \"next\";\n this.next = finallyEntry.finallyLoc;\n return ContinueSentinel;\n }\n\n return this.complete(record);\n },\n\n complete: function(record, afterLoc) {\n if (record.type === \"throw\") {\n throw record.arg;\n }\n\n if (record.type === \"break\" ||\n record.type === \"continue\") {\n this.next = record.arg;\n } else if (record.type === \"return\") {\n this.rval = this.arg = record.arg;\n this.method = \"return\";\n this.next = \"end\";\n } else if (record.type === \"normal\" && afterLoc) {\n this.next = afterLoc;\n }\n\n return ContinueSentinel;\n },\n\n finish: function(finallyLoc) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.finallyLoc === finallyLoc) {\n this.complete(entry.completion, entry.afterLoc);\n resetTryEntry(entry);\n return ContinueSentinel;\n }\n }\n },\n\n \"catch\": function(tryLoc) {\n for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n var entry = this.tryEntries[i];\n if (entry.tryLoc === tryLoc) {\n var record = entry.completion;\n if (record.type === \"throw\") {\n var thrown = record.arg;\n resetTryEntry(entry);\n }\n return thrown;\n }\n }\n\n // The context.catch method must only be called with a location\n // argument that corresponds to a known catch block.\n throw new Error(\"illegal catch attempt\");\n },\n\n delegateYield: function(iterable, resultName, nextLoc) {\n this.delegate = {\n iterator: values(iterable),\n resultName: resultName,\n nextLoc: nextLoc\n };\n\n if (this.method === \"next\") {\n // Deliberately forget the last sent value so that we don't\n // accidentally pass it on to the delegate.\n this.arg = undefined;\n }\n\n return ContinueSentinel;\n }\n };\n\n // Regardless of whether this script is executing as a CommonJS module\n // or not, return the runtime object so that we can declare the variable\n // regeneratorRuntime in the outer scope, which allows this module to be\n // injected easily by `bin/regenerator --include-runtime script.js`.\n return exports;\n\n}(\n // If this script is executing as a CommonJS module, use module.exports\n // as the regeneratorRuntime namespace. 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'),\n ]);\n\n $infoDiv\n .append($children, $footer)\n .addClass('wide');\n }\n\n /**\n * @return {number} (in pixels) of the toolbar height. 0 if no toolbar.\n */\n getToolBarHeight() {\n const { $BRtoolbar } = this.br.refs;\n if ($BRtoolbar && $BRtoolbar.css('display') === 'block') {\n return ($BRtoolbar.outerHeight() + parseInt($BRtoolbar.css('top')));\n } else {\n return 0;\n }\n }\n}\n\nexport function blankInfoDiv() {\n return $(`\n `);\n}\n\nexport function blankShareDiv() {\n return $(`\n
\n
`);\n}\n\n/**\n * Helper opens a popup window. On mobile it only opens a new tab. Used for share.\n * @param {string} href\n * @param {number} width\n * @param {number} height\n * @param {string} name\n */\nexport function createPopup(href, width, height, name) {\n // Fixes dual-screen position\n const dualScreenLeft = window.screenLeft != undefined ? window.screenLeft : screen.left;\n const dualScreenTop = window.screenTop != undefined ? window.screenTop : screen.top;\n\n const win_w = window.innerWidth || document.documentElement.clientWidth || screen.width;\n const win_h = window.innerHeight || document.documentElement.clientHeight || screen.height;\n\n const left = ((win_w / 2) - (width / 2)) + dualScreenLeft;\n const top = ((win_h / 2) - (height / 2)) + dualScreenTop;\n const opts = `status=1,width=${width},height=${height},top=${top},left=${left}`;\n\n window.open(href, name, opts);\n}\n","// @ts-check\nimport { clamp } from './utils.js';\n/** @typedef {import('./options.js').PageData} PageData */\n/** @typedef {import('../BookReader.js').default} BookReader */\n\n// URI to display when a page is not viewable.\n// TODO Render configurable html for the user instead.\n// FIXME Don't reference files on archive.org\nconst UNVIEWABLE_PAGE_URI = '/bookreader/static/preview-default.png';\n\n/**\n * Contains information about the Book/Document independent of the way it is\n * being rendering. Nothing here should reference e.g. the mode, zoom, etc.\n * It's just information about the book and its pages (usually as specified\n * in the BookReader data option.)\n */\nexport class BookModel {\n /**\n * @param {BookReader} br\n */\n constructor(br) {\n this.br = br;\n\n /** @type {{width: number, height: number}} memoize storage */\n this._medianPageSize = null;\n /** @type {[PageData[], number]} */\n this._getDataFlattenedCached = null;\n }\n\n /**\n * Memoized\n * @return {{width: number, height: number}}\n */\n getMedianPageSize() {\n if (this._medianPageSize) {\n return this._medianPageSize;\n }\n\n // A little expensive but we just do it once\n const widths = [];\n const heights = [];\n for (let i = 0; i < this.getNumLeafs(); i++) {\n widths.push(this.getPageWidth(i));\n heights.push(this.getPageHeight(i));\n }\n\n widths.sort();\n heights.sort();\n\n this._medianPageSize = {\n width: widths[Math.floor(widths.length / 2)],\n height: heights[Math.floor(heights.length / 2)]\n };\n return this._medianPageSize;\n }\n\n /**\n * Returns the page width for the given index, or first or last page if out of range\n * @deprecated see getPageWidth\n * @param {PageIndex} index\n */\n _getPageWidth(index) {\n // Synthesize a page width for pages not actually present in book.\n // May or may not be the best approach.\n // If index is out of range we return the width of first or last page\n index = clamp(index, 0, this.getNumLeafs() - 1);\n return this.getPageWidth(index);\n }\n\n /**\n * Returns the page height for the given index, or first or last page if out of range\n * @deprecated see getPageHeight\n * @param {PageIndex} index\n */\n _getPageHeight(index) {\n const clampedIndex = clamp(index, 0, this.getNumLeafs() - 1);\n return this.getPageHeight(clampedIndex);\n }\n\n /**\n * Returns the *highest* index the given page number, or undefined\n * @param {PageNumString} pageNum\n * @return {PageIndex|undefined}\n */\n getPageIndex(pageNum) {\n const pageIndices = this.getPageIndices(pageNum);\n return pageIndices.length ? pageIndices[pageIndices.length - 1] : undefined;\n }\n\n /**\n * Returns an array (possibly empty) of the indices with the given page number\n * @param {PageNumString} pageNum\n * @return {PageIndex[]}\n */\n getPageIndices(pageNum) {\n const indices = [];\n\n // Check for special \"nXX\" page number\n if (pageNum.slice(0,1) == 'n') {\n try {\n const pageIntStr = pageNum.slice(1, pageNum.length);\n const pageIndex = parseInt(pageIntStr);\n indices.push(pageIndex);\n return indices;\n } catch (err) {\n // Do nothing... will run through page names and see if one matches\n }\n }\n\n for (let i = 0; i < this.getNumLeafs(); i++) {\n if (this.getPageNum(i) == pageNum) {\n indices.push(i);\n }\n }\n\n return indices;\n }\n\n /**\n * Returns the name of the page as it should be displayed in the user interface\n * @param {PageIndex} index\n * @return {string}\n */\n getPageName(index) {\n return 'Page ' + this.getPageNum(index);\n }\n\n /**\n * @return {number} the total number of leafs (like an array length)\n */\n getNumLeafs() {\n // For deprecated interface support, if numLeafs is set, use that.\n if (this.br.numLeafs !== undefined)\n return this.br.numLeafs;\n return this._getDataFlattened().length;\n }\n\n /**\n * @param {PageIndex} index\n * @return {Number|undefined}\n */\n getPageWidth(index) {\n return this.getPageProp(index, 'width');\n }\n\n /**\n * @param {PageIndex} index\n * @return {Number|undefined}\n */\n getPageHeight(index) {\n return this.getPageProp(index, 'height');\n }\n\n /**\n * @param {PageIndex} index\n * @param {number} reduce - not used in default implementation\n * @param {number} rotate - not used in default implementation\n * @return {string|undefined}\n */\n // eslint-disable-next-line no-unused-vars\n getPageURI(index, reduce, rotate) {\n return !this.getPageProp(index, 'viewable', true) ? UNVIEWABLE_PAGE_URI : this.getPageProp(index, 'uri');\n }\n\n /**\n * @param {PageIndex} index\n * @return {'L' | 'R'}\n */\n getPageSide(index) {\n return this.getPageProp(index, 'pageSide') || (index % 2 === 0 ? 'R' : 'L');\n }\n\n /**\n * @param {PageIndex} index\n * @return {PageNumString}\n */\n getPageNum(index) {\n const pageNum = this.getPageProp(index, 'pageNum');\n return pageNum === undefined ? `n${index}` : pageNum;\n }\n\n /**\n * Generalized property accessor.\n * @param {PageIndex} index\n * @param {keyof PageData} propName\n * @param {*} [fallbackValue] return if undefined\n * @return {*|undefined}\n */\n getPageProp(index, propName, fallbackValue = undefined) {\n return this._getDataProp(index, propName, fallbackValue);\n }\n\n /**\n * This function returns the left and right indices for the user-visible\n * spread that contains the given index.\n * @note Can return indices out of range of what's in the book.\n * @param {PageIndex} pindex\n * @return {[PageIndex, PageIndex]} eg [0, 1]\n */\n getSpreadIndices(pindex) {\n if (this.br.pageProgression == 'rl') {\n return this.getPageSide(pindex) == 'R' ? [pindex + 1, pindex] : [pindex, pindex - 1];\n } else {\n return this.getPageSide(pindex) == 'L' ? [pindex, pindex + 1] : [pindex - 1, pindex];\n }\n }\n\n /**\n * Single images in the Internet Archive scandata.xml metadata are (somewhat incorrectly)\n * given a \"leaf\" number. Some of these images from the scanning process should not\n * be displayed in the BookReader (for example colour calibration cards). Since some\n * of the scanned images will not be displayed in the BookReader (those marked with\n * addToAccessFormats false in the scandata.xml) leaf numbers and BookReader page\n * indexes are generally not the same. This function returns the BookReader page\n * index given a scanned leaf number.\n *\n * This function is used, for example, to map between search results (that use the\n * leaf numbers) and the displayed pages in the BookReader.\n * @param {LeafNum} leafNum\n * @return {PageIndex}\n */\n leafNumToIndex(leafNum) {\n const index = this._getDataFlattened()\n .findIndex(d => d.leafNum == leafNum);\n // If no match is found, fall back to the leafNum provide (leafNum == index)\n return index > -1 ? index : leafNum;\n }\n\n /**\n * Parses the pageString format\n * @param {PageString} pageString\n * @return {PageIndex|undefined}\n */\n parsePageString(pageString) {\n let pageIndex;\n // Check for special \"leaf\"\n const leafMatch = /^leaf(\\d+)/.exec(pageString);\n if (leafMatch) {\n pageIndex = this.leafNumToIndex(parseInt(leafMatch[1], 10));\n if (pageIndex === null) {\n pageIndex = undefined; // to match return type of getPageIndex\n }\n } else {\n pageIndex = this.getPageIndex(pageString);\n }\n return pageIndex;\n }\n\n /**\n * @param {number} index use negatives to get page relative to end\n */\n getPage(index) {\n const numLeafs = this.getNumLeafs();\n if (index < 0 && index >= -numLeafs) {\n index += numLeafs;\n }\n return new PageModel(this, index);\n }\n\n /**\n * @param {object} [arg0]\n * @param {number} [arg0.start] inclusive\n * @param {number} [arg0.end] exclusive\n * @param {boolean} [arg0.combineConsecutiveUnviewables] Yield only first unviewable\n * of a chunk of unviewable pages instead of each page\n */\n * pagesIterator({ start = 0, end = Infinity, combineConsecutiveUnviewables = false } = {}) {\n start = Math.max(0, start);\n end = Math.min(end, this.getNumLeafs());\n\n for (let i = start; i < end; i++) {\n const page = this.getPage(i);\n if (combineConsecutiveUnviewables && page.isConsecutiveUnviewable) continue;\n\n yield page;\n }\n }\n\n /**\n * Flatten the nested structure (make 1d array), and also add pageSide prop\n * @return {PageData[]}\n */\n _getDataFlattened() {\n if (this._getDataFlattenedCached && this._getDataFlattenedCached[1] === this.br.data.length)\n return this._getDataFlattenedCached[0];\n\n let prevPageSide = null;\n /** @type {number|null} */\n let unviewablesChunkStart = null;\n let index = 0;\n // @ts-ignore TS doesn't know about flatMap for some reason\n const flattend = this.br.data.flatMap(spread => {\n return spread.map(page => {\n if (!page.pageSide) {\n if (prevPageSide === null) {\n page.pageSide = spread.length === 2 ? 'L' : 'R';\n } else {\n page.pageSide = prevPageSide === 'L' ? 'R' : 'L';\n }\n }\n prevPageSide = page.pageSide;\n\n if (page.viewable === false) {\n if (unviewablesChunkStart === null) {\n page.unviewablesStart = unviewablesChunkStart = index;\n } else {\n page.unviewablesStart = unviewablesChunkStart;\n }\n } else {\n unviewablesChunkStart = null;\n }\n\n index++;\n return page;\n });\n });\n\n // length is used as a cache breaker\n this._getDataFlattenedCached = [flattend, this.br.data.length];\n return flattend;\n }\n\n /**\n * Helper. Return a prop for a given index. Returns `fallbackValue` if index is invalid or\n * property not on page.\n * @param {PageIndex} index\n * @param {keyof PageData} prop\n * @param {*} fallbackValue return if property not on the record\n * @return {*}\n */\n _getDataProp(index, prop, fallbackValue = undefined) {\n const dataf = this._getDataFlattened();\n const invalidIndex = isNaN(index) || index < 0 || index >= dataf.length;\n if (invalidIndex || 'undefined' == typeof(dataf[index][prop]))\n return fallbackValue;\n return dataf[index][prop];\n }\n}\n\n/**\n * A controlled schema for page data.\n */\nclass PageModel {\n /**\n * @param {BookModel} book\n * @param {PageIndex} index\n */\n constructor(book, index) {\n this.book = book;\n this.index = index;\n this.width = book.getPageWidth(index);\n this.height = book.getPageHeight(index);\n this.pageSide = book.getPageSide(index);\n this.leafNum = book._getDataProp(index, 'leafNum', this.index);\n\n /** @type {boolean} */\n this.isViewable = book._getDataProp(index, 'viewable', true);\n /** @type {PageIndex} The first in the series of unviewable pages this is in. */\n this.unviewablesStart = book._getDataProp(index, 'unviewablesStart') || null;\n /**\n * Consecutive unviewable pages are pages in an unviewable \"chunk\" which are not the first\n * of that chunk.\n */\n this.isConsecutiveUnviewable = !this.isViewable && this.unviewablesStart != this.index;\n\n this._rawData = this.book._getDataFlattened()[this.index];\n }\n\n /**\n * Updates the page to no longer be unviewable. Assumes the\n * Page's URI is already set/correct.\n */\n makeViewable(newViewableState = true) {\n if (this.isViewable == newViewableState) return;\n\n if (newViewableState) {\n this._rawData.viewable = true;\n delete this._rawData.unviewablesStart;\n // Update any subsequent page to now point to the right \"start\"\n for (const page of this.book.pagesIterator({ start: this.index + 1 })) {\n if (page.isViewable) break;\n page._rawData.unviewablesStart = this.index + 1;\n }\n } else {\n this._rawData.viewable = false;\n this._rawData.unviewablesStart = (this.prev && !this.prev.isViewable) ? this.prev.unviewablesStart : this.index;\n // Update any subsequent page to now point to the right \"start\"\n for (const page of this.book.pagesIterator({ start: this.index + 1 })) {\n if (!page.isViewable) break;\n page._rawData.unviewablesStart = this._rawData.unviewablesStart;\n }\n }\n }\n\n get prev() {\n return this.findPrev();\n }\n\n get next() {\n return this.findNext();\n }\n\n /**\n * @param {number} reduce\n * @param {number} rotate\n */\n getURI(reduce, rotate) {\n return this.book.getPageURI(this.index, reduce, rotate);\n }\n\n /**\n * @param {object} [arg0]\n * @param {boolean} [arg0.combineConsecutiveUnviewables] Whether to only yield the first page\n * of a series of unviewable pages instead of each page\n * @return {PageModel|void}\n */\n findNext({ combineConsecutiveUnviewables = false } = {}) {\n return this.book\n .pagesIterator({ start: this.index + 1, combineConsecutiveUnviewables })\n .next().value;\n }\n\n /**\n * @param {object} [arg0]\n * @param {boolean} [arg0.combineConsecutiveUnviewables] Whether to only yield the first page\n * of a series of unviewable pages instead of each page\n * @return {PageModel|void}\n */\n findPrev({ combineConsecutiveUnviewables = false } = {}) {\n if (this.index == 0) return undefined;\n\n if (combineConsecutiveUnviewables) {\n if (this.isConsecutiveUnviewable) {\n return this.book.getPage(this.unviewablesStart);\n } else {\n // Recursively goes backward through the book\n // TODO make a reverse iterator to make it look identical to findNext\n const prev = new PageModel(this.book, this.index - 1);\n return prev.isViewable ? prev : prev.findPrev({ combineConsecutiveUnviewables });\n }\n } else {\n return new PageModel(this.book, this.index - 1);\n }\n }\n}\n\n// There are a few main ways we can reference a specific page in a book:\n/**\n * @typedef {string} PageNumString\n * Possible values: /^n?\\d+$/. Example: 'n7', '18'\n * Not necessarily unique\n */\n/**\n * @typedef {number} LeafNum\n * No clue if 0 or 1 indexed or consecutive; generally from IA book info.\n */\n/**\n * @typedef {string} PageString\n * Possible values: /^(leaf)?\\d+$/ Example: 'leaf7', '18'\n * If leaf-prefixed, then the number is a LeafNum. Otherwise it's a PageNumString\n */\n/** @typedef {number} PageIndex 0-based index of all the pages */\n","// @ts-check\nimport { clamp } from './utils.js';\nimport { EVENTS } from './events.js';\n\n/** @typedef {import('../BookReader.js').default} BookReader */\n/** @typedef {import('./BookModel.js').BookModel} BookModel */\n/** @typedef {import('./BookModel.js').PageIndex} PageIndex */\n/** @typedef {import('./options.js').BookReaderOptions} BookReaderOptions */\n\nexport class Mode2Up {\n /**\n * @param {BookReader} br\n * @param {BookModel} bookModel\n */\n constructor(br, bookModel) {\n this.br = br;\n this.book = bookModel;\n\n /** @type {HTMLDivElement} */\n this.leafEdgeL = null;\n /** @type {HTMLDivElement} */\n this.leafEdgeR = null;\n }\n\n /**\n * @template T\n * @param {HTMLElement} element\n * @param {T} data\n * @param {function(HTMLElement, { data: T }): void} handler\n */\n setClickHandler(element, data, handler) {\n $(element).unbind('mouseup').bind('mouseup', data, function(e) {\n handler(this, e);\n });\n }\n\n drawLeafs() {\n const $twoPageViewEl = this.br.refs.$brTwoPageView;\n\n // $$$ we should use calculated values in this.twoPage (recalc if necessary)\n const indexL = this.br.twoPage.currentIndexL;\n const top = this.top();\n\n this.br.twoPage.scaledWL = this.getPageWidth(indexL);\n this.br.twoPage.gutter = this.gutter();\n\n this.br.prefetchImg(indexL);\n $(this.br.prefetchedImgs[indexL]).css({\n position: 'absolute',\n left: `${this.br.twoPage.gutter - this.br.twoPage.scaledWL}px`,\n right: '',\n top: `${top}px`,\n height: `${this.br.twoPage.height}px`, // $$$ height forced the same for both pages\n width: `${this.br.twoPage.scaledWL}px`,\n zIndex: 2\n }).appendTo($twoPageViewEl);\n\n const indexR = this.br.twoPage.currentIndexR;\n\n // $$$ should use getwidth2up?\n this.br.twoPage.scaledWR = this.getPageWidth(indexR);\n this.br.prefetchImg(indexR);\n $(this.br.prefetchedImgs[indexR]).css({\n position: 'absolute',\n left: `${this.br.twoPage.gutter}px`,\n right: '',\n top: `${top}px`,\n height: `${this.br.twoPage.height}px`, // $$$ height forced the same for both pages\n width: `${this.br.twoPage.scaledWR}px`,\n zIndex: 2\n }).appendTo($twoPageViewEl);\n\n this.displayedIndices = [this.br.twoPage.currentIndexL, this.br.twoPage.currentIndexR];\n this.setMouseHandlers();\n this.br.displayedIndices = this.displayedIndices;\n this.br.updateToolbarZoom(this.br.reduce);\n this.br.trigger('pageChanged');\n }\n\n /**\n * @param {1} direction\n */\n zoom(direction) {\n this.br.stopFlipAnimations();\n\n // Recalculate autofit factors\n this.calculateReductionFactors();\n\n // Get new zoom state\n const reductionFactor = this.br.nextReduce(this.br.reduce, direction, this.br.twoPage.reductionFactors);\n if ((this.br.reduce == reductionFactor.reduce) && (this.br.twoPage.autofit == reductionFactor.autofit)) {\n // Same zoom\n return;\n }\n this.br.twoPage.autofit = reductionFactor.autofit;\n this.br.reduce = reductionFactor.reduce;\n this.br.pageScale = this.br.reduce; // preserve current reduce\n\n // Preserve view center position\n const oldCenter = this.getViewCenter();\n\n // If zooming in, reload imgs. DOM elements will be removed by prepareTwoPageView\n // $$$ An improvement would be to use the low res image until the larger one is loaded.\n if (1 == direction) {\n for (const img in this.br.prefetchedImgs) {\n delete this.br.prefetchedImgs[img];\n }\n }\n\n // Prepare view with new center to minimize visual glitches\n this.prepareTwoPageView(oldCenter.percentageX, oldCenter.percentageY);\n }\n\n /**\n * @param {number} centerPercentageX\n * @param {number} centerPercentageY\n */\n prepareTwoPageView(centerPercentageX, centerPercentageY) {\n // Some decisions about two page view:\n //\n // Both pages will be displayed at the same height, even if they were different physical/scanned\n // sizes. This simplifies the animation (from a design as well as technical standpoint). We\n // examine the page aspect ratios (in calculateSpreadSize) and use the page with the most \"normal\"\n // aspect ratio to determine the height.\n //\n // The two page view div is resized to keep the middle of the book in the middle of the div\n // even as the page sizes change. To e.g. keep the middle of the book in the middle of the BRcontent\n // div requires adjusting the offset of BRtwpageview and/or scrolling in BRcontent.\n this.br.refs.$brContainer.empty();\n this.br.refs.$brContainer.css('overflow', 'auto');\n\n // We want to display two facing pages. We may be missing\n // one side of the spread because it is the first/last leaf,\n // foldouts, missing pages, etc\n\n const targetLeaf = clamp(this.br.firstIndex, this.br.firstDisplayableIndex(), this.br.lastDisplayableIndex());\n const currentSpreadIndices = this.book.getSpreadIndices(targetLeaf);\n this.br.twoPage.currentIndexL = currentSpreadIndices[0];\n this.br.twoPage.currentIndexR = currentSpreadIndices[1];\n\n this.calculateSpreadSize(); //sets twoPage.width, twoPage.height and others\n\n this.br.pruneUnusedImgs();\n this.br.prefetch(); // Preload images or reload if scaling has changed\n\n // Add the two page view\n // $$$ Can we get everything set up and then append?\n const $twoPageViewEl = $('');\n this.br.refs.$brTwoPageView = $twoPageViewEl;\n this.br.refs.$brContainer.append($twoPageViewEl);\n\n // Attaches to first child, so must come after we add the page view\n this.br.refs.$brContainer.dragscrollable({preventDefault:true});\n this.br.bindGestures(this.br.refs.$brContainer);\n\n // $$$ calculate first then set\n this.br.refs.$brTwoPageView.css({\n height: `${this.br.twoPage.totalHeight}px`,\n width: `${this.br.twoPage.totalWidth}px`,\n position: 'absolute'\n });\n\n // If there will not be scrollbars (e.g. when zooming out) we center the book\n // since otherwise the book will be stuck off-center\n if (this.br.twoPage.totalWidth < this.br.refs.$brContainer.prop('clientWidth')) {\n centerPercentageX = 0.5;\n }\n if (this.br.twoPage.totalHeight < this.br.refs.$brContainer.prop('clientHeight')) {\n centerPercentageY = 0.5;\n }\n\n this.centerView(centerPercentageX, centerPercentageY);\n\n this.br.twoPage.coverDiv = document.createElement('div');\n $(this.br.twoPage.coverDiv).attr('class', 'BRbookcover').css({\n width: `${this.br.twoPage.bookCoverDivWidth}px`,\n height: `${this.br.twoPage.bookCoverDivHeight}px`,\n visibility: 'visible'\n }).appendTo(this.br.refs.$brTwoPageView);\n\n this.leafEdgeR = document.createElement('div');\n this.leafEdgeR.className = 'BRleafEdgeR';\n\n $(this.leafEdgeR).css({\n width: `${this.br.twoPage.leafEdgeWidthR}px`,\n height: `${this.br.twoPage.height}px`,\n left: `${this.br.twoPage.gutter + this.br.twoPage.scaledWR}px`,\n top: `${this.br.twoPage.bookCoverDivTop + this.br.twoPage.coverInternalPadding}px`,\n border: this.br.twoPage.leafEdgeWidthR === 0 ? 'none' : null\n }).appendTo(this.br.refs.$brTwoPageView);\n\n this.leafEdgeL = document.createElement('div');\n this.leafEdgeL.className = 'BRleafEdgeL';\n $(this.leafEdgeL).css({\n width: `${this.br.twoPage.leafEdgeWidthL}px`,\n height: `${this.br.twoPage.height}px`,\n left: `${this.br.twoPage.bookCoverDivLeft + this.br.twoPage.coverInternalPadding}px`,\n top: `${this.br.twoPage.bookCoverDivTop + this.br.twoPage.coverInternalPadding}px`,\n border: this.br.twoPage.leafEdgeWidthL === 0 ? 'none' : null\n }).appendTo(this.br.refs.$brTwoPageView);\n\n const div = document.createElement('div');\n $(div).attr('class', 'BRgutter').css({\n width: `${this.br.twoPage.bookSpineDivWidth}px`,\n height: `${this.br.twoPage.bookSpineDivHeight}px`,\n left: `${this.br.twoPage.gutter - this.br.twoPage.bookSpineDivWidth * 0.5}px`,\n top: `${this.br.twoPage.bookSpineDivTop}px`\n }).appendTo(this.br.refs.$brTwoPageView);\n\n this.preparePopUp();\n\n this.br.displayedIndices = [];\n\n this.drawLeafs();\n this.br.updateToolbarZoom(this.br.reduce);\n\n this.br.prefetch();\n\n if (this.br.enableSearch) {\n this.br.removeSearchHilites();\n this.br.updateSearchHilites();\n }\n\n this.br.updateBrClasses();\n }\n\n /**\n * This function prepares the \"View Page n\" popup that shows while the mouse is\n * over the left/right \"stack of sheets\" edges. It also binds the mouse\n * events for these divs.\n */\n preparePopUp() {\n this.br.twoPagePopUp = document.createElement('div');\n this.br.twoPagePopUp.className = 'BRtwoPagePopUp';\n $(this.br.twoPagePopUp).css({\n zIndex: '1000'\n }).appendTo(this.br.refs.$brContainer);\n $(this.br.twoPagePopUp).hide();\n\n const leafEdges = [\n {\n $leafEdge: $(this.leafEdgeL),\n /** @type {function(number): PageIndex} */\n jumpIndexForPageX: this.jumpIndexForLeftEdgePageX.bind(this),\n leftOffset: () => -$(this.br.twoPagePopUp).width() + 120,\n },\n {\n $leafEdge: $(this.leafEdgeR),\n /** @type {function(number): PageIndex} */\n jumpIndexForPageX: this.jumpIndexForRightEdgePageX.bind(this),\n leftOffset: () => -120,\n },\n ];\n\n for (const { $leafEdge, jumpIndexForPageX, leftOffset } of leafEdges) {\n $leafEdge.on('mouseenter', () => $(this.br.twoPagePopUp).show());\n $leafEdge.on('mouseleave', () => $(this.br.twoPagePopUp).hide());\n\n $leafEdge.on('click', e => {\n this.br.trigger(EVENTS.stop);\n this.br.jumpToIndex(jumpIndexForPageX(e.pageX));\n });\n\n $leafEdge.on('mousemove', e => {\n const jumpIndex = clamp(jumpIndexForPageX(e.pageX), 0, this.book.getNumLeafs() - 1);\n $(this.br.twoPagePopUp).text(`View ${this.book.getPageName(jumpIndex)}`);\n\n // $$$ TODO: Make sure popup is positioned so that it is in view\n // (https://bugs.edge.launchpad.net/gnubook/+bug/327456)\n $(this.br.twoPagePopUp).css({\n left: `${e.pageX - this.br.refs.$brContainer.offset().left + this.br.refs.$brContainer.scrollLeft() + leftOffset()}px`,\n top: `${e.pageY - this.br.refs.$brContainer.offset().top + this.br.refs.$brContainer.scrollTop()}px`\n });\n });\n }\n }\n\n /**\n * Calculates 2-page spread dimensions based on this.br.twoPage.currentIndexL and\n * this.br.twoPage.currentIndexR\n * This function sets this.br.twoPage.height, twoPage.width\n */\n calculateSpreadSize() {\n const firstIndex = this.br.twoPage.currentIndexL;\n const secondIndex = this.br.twoPage.currentIndexR;\n\n // Calculate page sizes and total leaf width\n let spreadSize;\n if ( this.br.twoPage.autofit) {\n spreadSize = this.getIdealSpreadSize(firstIndex, secondIndex);\n } else {\n // set based on reduction factor\n spreadSize = this.getSpreadSizeFromReduce(firstIndex, secondIndex, this.br.reduce);\n }\n\n // Both pages together\n this.br.twoPage.height = spreadSize.height;\n this.br.twoPage.width = spreadSize.width;\n\n // Individual pages\n this.br.twoPage.scaledWL = this.getPageWidth(firstIndex);\n this.br.twoPage.scaledWR = this.getPageWidth(secondIndex);\n\n // Leaf edges\n this.br.twoPage.edgeWidth = spreadSize.totalLeafEdgeWidth; // The combined width of both edges\n this.br.twoPage.leafEdgeWidthL = this.br.leafEdgeWidth(this.br.twoPage.currentIndexL);\n this.br.twoPage.leafEdgeWidthR = this.br.twoPage.edgeWidth - this.br.twoPage.leafEdgeWidthL;\n\n\n // Book cover\n // The width of the book cover div. The combined width of both pages, twice the width\n // of the book cover internal padding (2*10) and the page edges\n this.br.twoPage.bookCoverDivWidth = this.coverWidth(this.br.twoPage.scaledWL + this.br.twoPage.scaledWR);\n // The height of the book cover div\n this.br.twoPage.bookCoverDivHeight = this.br.twoPage.height + 2 * this.br.twoPage.coverInternalPadding;\n\n\n // We calculate the total width and height for the div so that we can make the book\n // spine centered\n const leftGutterOffset = this.gutterOffsetForIndex(firstIndex);\n const leftWidthFromCenter = this.br.twoPage.scaledWL - leftGutterOffset + this.br.twoPage.leafEdgeWidthL;\n const rightWidthFromCenter = this.br.twoPage.scaledWR + leftGutterOffset + this.br.twoPage.leafEdgeWidthR;\n const largestWidthFromCenter = Math.max( leftWidthFromCenter, rightWidthFromCenter );\n this.br.twoPage.totalWidth = 2 * (largestWidthFromCenter + this.br.twoPage.coverInternalPadding + this.br.twoPage.coverExternalPadding);\n this.br.twoPage.totalHeight = this.br.twoPage.height + 2 * (this.br.twoPage.coverInternalPadding + this.br.twoPage.coverExternalPadding);\n\n // We want to minimize the unused space in two-up mode (maximize the amount of page\n // shown). We give width to the leaf edges and these widths change (though the sum\n // of the two remains constant) as we flip through the book. With the book\n // cover centered and fixed in the BRcontainer div the page images will meet\n // at the \"gutter\" which is generally offset from the center.\n this.br.twoPage.middle = this.br.twoPage.totalWidth >> 1;\n this.br.twoPage.gutter = this.br.twoPage.middle + this.gutterOffsetForIndex(firstIndex);\n\n // The left edge of the book cover moves depending on the width of the pages\n // $$$ change to getter\n this.br.twoPage.bookCoverDivLeft = this.br.twoPage.gutter - this.br.twoPage.scaledWL - this.br.twoPage.leafEdgeWidthL - this.br.twoPage.coverInternalPadding;\n // The top edge of the book cover stays a fixed distance from the top\n this.br.twoPage.bookCoverDivTop = this.br.twoPage.coverExternalPadding;\n\n // Book spine\n this.br.twoPage.bookSpineDivHeight = this.br.twoPage.height + 2 * this.br.twoPage.coverInternalPadding;\n this.br.twoPage.bookSpineDivLeft = this.br.twoPage.middle - (this.br.twoPage.bookSpineDivWidth >> 1);\n this.br.twoPage.bookSpineDivTop = this.br.twoPage.bookCoverDivTop;\n\n\n this.br.reduce = spreadSize.reduce; // $$$ really set this here?\n }\n\n /**\n *\n * @param {number} firstIndex\n * @param {number} secondIndex\n * @return {{ width: number, height: number, totalLeafEdgeWidth: number, reduce: number}}\n */\n getIdealSpreadSize(firstIndex, secondIndex) {\n const ideal = {};\n\n // We check which page is closest to a \"normal\" page and use that to set the height\n // for both pages. This means that foldouts and other odd size pages will be displayed\n // smaller than the nominal zoom amount.\n const canon5Dratio = 1.5;\n\n const first = {\n height: this.book._getPageHeight(firstIndex),\n width: this.book._getPageWidth(firstIndex)\n };\n\n const second = {\n height: this.book._getPageHeight(secondIndex),\n width: this.book._getPageWidth(secondIndex)\n };\n\n const firstIndexRatio = first.height / first.width;\n const secondIndexRatio = second.height / second.width;\n\n let ratio;\n if (Math.abs(firstIndexRatio - canon5Dratio) < Math.abs(secondIndexRatio - canon5Dratio)) {\n ratio = firstIndexRatio;\n } else {\n ratio = secondIndexRatio;\n }\n\n const totalLeafEdgeWidth = Math.floor(this.book.getNumLeafs() * 0.1);\n const maxLeafEdgeWidth = Math.floor(this.br.refs.$brContainer.prop('clientWidth') * 0.1);\n ideal.totalLeafEdgeWidth = Math.min(totalLeafEdgeWidth, maxLeafEdgeWidth);\n\n const widthOutsidePages = 2 * (this.br.twoPage.coverInternalPadding + this.br.twoPage.coverExternalPadding) + ideal.totalLeafEdgeWidth;\n const heightOutsidePages = 2 * (this.br.twoPage.coverInternalPadding + this.br.twoPage.coverExternalPadding);\n\n ideal.width = (this.br.refs.$brContainer.width() - widthOutsidePages) >> 1;\n ideal.width -= 10; // $$$ fudge factor\n ideal.height = this.br.refs.$brContainer.height() - heightOutsidePages;\n\n ideal.height -= 15; // fudge factor\n\n if (ideal.height / ratio <= ideal.width) {\n //use height\n ideal.width = Math.floor(ideal.height / ratio);\n } else {\n //use width\n ideal.height = Math.floor(ideal.width * ratio);\n }\n\n // $$$ check this logic with large spreads\n ideal.reduce = ((first.height + second.height) / 2) / ideal.height;\n\n return ideal;\n }\n\n /**\n * Returns the spread size calculated from the reduction factor for the given pages\n * @param {number} firstIndex\n * @param {number} secondIndex\n * @return {Object}\n */\n getSpreadSizeFromReduce(firstIndex, secondIndex, reduce) {\n const spreadSize = {};\n // $$$ Scale this based on reduce?\n const totalLeafEdgeWidth = Math.floor(this.book.getNumLeafs() * 0.1);\n // $$$ Assumes leaf edge width constant at all zoom levels\n const maxLeafEdgeWidth = Math.floor(this.br.refs.$brContainer.prop('clientWidth') * 0.1);\n spreadSize.totalLeafEdgeWidth = Math.min(totalLeafEdgeWidth, maxLeafEdgeWidth);\n\n // $$$ Possibly incorrect -- we should make height \"dominant\"\n const nativeWidth = this.book._getPageWidth(firstIndex) + this.book._getPageWidth(secondIndex);\n const nativeHeight = this.book._getPageHeight(firstIndex) + this.book._getPageHeight(secondIndex);\n spreadSize.height = Math.floor( (nativeHeight / 2) / this.br.reduce );\n spreadSize.width = Math.floor( (nativeWidth / 2) / this.br.reduce );\n spreadSize.reduce = reduce;\n\n return spreadSize;\n }\n\n /**\n * Returns the current ideal reduction factor\n * @return {number}\n */\n getAutofitReduce() {\n const spreadSize = this.getIdealSpreadSize(this.br.twoPage.currentIndexL, this.br.twoPage.currentIndexR);\n return spreadSize.reduce;\n }\n\n /**\n * Returns true if the pages extend past the edge of the view\n * @deprecated slated for deprecation by v5.0.0\n * @return {boolean}\n */\n isZoomedIn() {\n let isZoomedIn = false;\n if (this.br.twoPage.autofit != 'auto') {\n if (this.br.reduce < this.getAutofitReduce()) {\n isZoomedIn = true;\n }\n }\n return isZoomedIn;\n }\n\n calculateReductionFactors() {\n this.br.twoPage.reductionFactors = this.br.reductionFactors.concat([\n {\n reduce: this.getIdealSpreadSize( this.br.twoPage.currentIndexL, this.br.twoPage.currentIndexR ).reduce,\n autofit: 'auto'\n }\n ]);\n this.br.twoPage.reductionFactors.sort(this.br._reduceSort);\n }\n\n /**\n * Set the cursor for two page view\n * @deprecated Since version 4.3.3. Will be deleted in version 5.0\n */\n setCursor() {\n const $twoPageViewEl = this.br.refs.$brTwoPageView;\n if ( ($twoPageViewEl.width() > this.br.refs.$brContainer.prop('clientWidth')) ||\n ($twoPageViewEl.height() > this.br.refs.$brContainer.prop('clientHeight')) ) {\n if (this.br.prefetchedImgs[this.br.twoPage.currentIndexL])\n this.br.prefetchedImgs[this.br.twoPage.currentIndexL].style.cursor = 'move';\n if (this.br.prefetchedImgs[this.br.twoPage.currentIndexR])\n this.br.prefetchedImgs[this.br.twoPage.currentIndexR].style.cursor = 'move';\n } else {\n if (this.br.prefetchedImgs[this.br.twoPage.currentIndexL])\n this.br.prefetchedImgs[this.br.twoPage.currentIndexL].style.cursor = '';\n if (this.br.prefetchedImgs[this.br.twoPage.currentIndexR])\n this.br.prefetchedImgs[this.br.twoPage.currentIndexR].style.cursor = '';\n }\n }\n\n /**\n * @param {Number|null} index to flip back one spread, pass index=null\n */\n flipBackToIndex(index) {\n if (this.br.constMode1up == this.br.mode) return;\n if (this.br.animating) return;\n\n if (null != this.br.leafEdgeTmp) {\n alert('error: leafEdgeTmp should be null!');\n return;\n }\n\n if (null == index) {\n const {currentIndexL, currentIndexR} = this.br.twoPage;\n const minDisplayedIndex = Math.min(currentIndexL, currentIndexR);\n const prev = this.book.getPage(minDisplayedIndex).findPrev({ combineConsecutiveUnviewables: true });\n if (!prev) return;\n index = prev.index;\n // Can only flip to a left page\n // (downstream code handles index = -1, so this is ok I guess)\n if (prev.pageSide == 'R') index--;\n }\n\n this.br.updateNavIndexThrottled(index);\n\n const previousIndices = this.book.getSpreadIndices(index);\n\n if (previousIndices[0] < this.br.firstDisplayableIndex() || previousIndices[1] < this.br.firstDisplayableIndex()) {\n return;\n }\n\n this.br.animating = true;\n\n if ('rl' != this.br.pageProgression) {\n // Assume LTR and we are going backward\n this.prepareFlipLeftToRight(previousIndices[0], previousIndices[1]);\n this.flipLeftToRight(previousIndices[0], previousIndices[1]);\n } else {\n // RTL and going backward\n this.prepareFlipRightToLeft(previousIndices[0], previousIndices[1]);\n this.flipRightToLeft(previousIndices[0], previousIndices[1]);\n }\n }\n\n /**\n * Flips the page on the left towards the page on the right\n * @param {number} newIndexL\n * @param {number} newIndexR\n */\n flipLeftToRight(newIndexL, newIndexR) {\n this.br.refs.$brContainer.addClass(\"BRpageFlipping\");\n const leftLeaf = this.br.twoPage.currentIndexL;\n\n const oldLeafEdgeWidthL = this.br.leafEdgeWidth(this.br.twoPage.currentIndexL);\n const newLeafEdgeWidthL = this.br.leafEdgeWidth(newIndexL);\n const leafEdgeTmpW = oldLeafEdgeWidthL - newLeafEdgeWidthL;\n\n const currWidthL = this.getPageWidth(leftLeaf);\n const newWidthL = this.getPageWidth(newIndexL);\n const newWidthR = this.getPageWidth(newIndexR);\n\n const top = this.top();\n const gutter = this.br.twoPage.middle + this.gutterOffsetForIndex(newIndexL);\n\n //animation strategy:\n // 0. remove search highlight, if any.\n // 1. create a new div, called leafEdgeTmp to represent the leaf edge between the leftmost edge\n // of the left leaf and where the user clicked in the leaf edge.\n // Note that if this function was triggered by left() and not a\n // mouse click, the width of leafEdgeTmp is very small (zero px).\n // 2. animate both leafEdgeTmp to the gutter (without changing its width) and animate\n // leftLeaf to width=0.\n // 3. When step 2 is finished, animate leafEdgeTmp to right-hand side of new right leaf\n // (left=gutter+newWidthR) while also animating the new right leaf from width=0 to\n // its new full width.\n // 4. After step 3 is finished, do the following:\n // - remove leafEdgeTmp from the dom.\n // - resize and move the right leaf edge (leafEdgeR) to left=gutter+newWidthR\n // and width=twoPage.edgeWidth-newLeafEdgeWidthL.\n // - resize and move the left leaf edge (leafEdgeL) to left=gutter-newWidthL-newLeafEdgeWidthL\n // and width=newLeafEdgeWidthL.\n // - resize the back cover (twoPage.coverDiv) to left=gutter-newWidthL-newLeafEdgeWidthL-10\n // and width=newWidthL+newWidthR+twoPage.edgeWidth+20\n // - move new left leaf (newIndexL) forward to zindex=2 so it can receive clicks.\n // - remove old left and right leafs from the dom [pruneUnusedImgs()].\n // - prefetch new adjacent leafs.\n // - set up click handlers for both new left and right leafs.\n // - redraw the search highlight.\n // - update the pagenum box and the url.\n\n const $twoPageViewEl = this.br.refs.$brTwoPageView;\n const leftEdgeTmpLeft = gutter - currWidthL - leafEdgeTmpW;\n\n this.br.leafEdgeTmp = document.createElement('div');\n this.br.leafEdgeTmp.className = 'BRleafEdgeTmp';\n $(this.br.leafEdgeTmp).css({\n width: `${leafEdgeTmpW}px`,\n height: `${this.br.twoPage.height}px`,\n left: `${leftEdgeTmpLeft}px`,\n top: `${top}px`,\n zIndex: 1000,\n }).appendTo($twoPageViewEl);\n\n $(this.leafEdgeL).css({\n width: `${newLeafEdgeWidthL}px`,\n left: `${gutter - currWidthL - newLeafEdgeWidthL}px`\n });\n\n // Left gets the offset of the current left leaf from the document\n const left = $(this.br.prefetchedImgs[leftLeaf]).offset().left;\n // $$$ This seems very similar to the gutter. May be able to consolidate the logic.\n const right = `${$twoPageViewEl.prop('clientWidth') - left - $(this.br.prefetchedImgs[leftLeaf]).width() + $twoPageViewEl.offset().left - 2}px`;\n\n // We change the left leaf to right positioning\n // $$$ This causes animation glitches during resize. See https://bugs.edge.launchpad.net/gnubook/+bug/328327\n $(this.br.prefetchedImgs[leftLeaf]).css({\n right: right,\n left: ''\n });\n\n $(this.br.leafEdgeTmp).animate({left: gutter}, this.br.flipSpeed, 'easeInSine');\n\n if (this.br.enableSearch) this.br.removeSearchHilites();\n\n $(this.br.prefetchedImgs[leftLeaf]).animate({width: '0px'}, this.br.flipSpeed, 'easeInSine', () => {\n\n $(this.br.leafEdgeTmp).animate({left: `${gutter + newWidthR}px`}, this.br.flipSpeed, 'easeOutSine');\n\n this.br.$('.BRgutter').css({left: `${gutter - this.br.twoPage.bookSpineDivWidth * 0.5}px`});\n\n $(this.br.prefetchedImgs[newIndexR]).animate({width: `${newWidthR}px`}, this.br.flipSpeed, 'easeOutSine', () => {\n $(this.br.prefetchedImgs[newIndexL]).css('zIndex', 2);\n\n //jquery adds display:block to the element style, which interferes with our print css\n $(this.br.prefetchedImgs[newIndexL]).css('display', '');\n $(this.br.prefetchedImgs[newIndexR]).css('display', '');\n\n $(this.leafEdgeR).css({\n // Moves the right leaf edge\n width: `${this.br.twoPage.edgeWidth - newLeafEdgeWidthL}px`,\n left: `${gutter + newWidthR}px`\n });\n\n $(this.leafEdgeL).css({\n // Moves and resizes the left leaf edge\n width: `${newLeafEdgeWidthL}px`,\n left: `${gutter - newWidthL - newLeafEdgeWidthL}px`\n });\n\n // Resizes the brown border div\n $(this.br.twoPage.coverDiv).css({\n width: `${this.coverWidth(newWidthL + newWidthR)}px`,\n left: `${gutter - newWidthL - newLeafEdgeWidthL - this.br.twoPage.coverInternalPadding}px`\n });\n\n $(this.br.leafEdgeTmp).remove();\n this.br.leafEdgeTmp = null;\n\n // $$$ TODO refactor with opposite direction flip\n\n this.br.twoPage.currentIndexL = newIndexL;\n this.br.twoPage.currentIndexR = newIndexR;\n this.br.twoPage.scaledWL = newWidthL;\n this.br.twoPage.scaledWR = newWidthR;\n this.br.twoPage.gutter = gutter;\n\n this.br.updateFirstIndex(this.br.twoPage.currentIndexL);\n this.br.displayedIndices = [newIndexL, newIndexR];\n this.br.pruneUnusedImgs();\n this.br.prefetch();\n this.br.animating = false;\n\n if (this.br.enableSearch) this.br.updateSearchHilites();\n\n this.setMouseHandlers();\n\n if (this.br.animationFinishedCallback) {\n this.br.animationFinishedCallback();\n this.br.animationFinishedCallback = null;\n }\n\n this.br.refs.$brContainer.removeClass(\"BRpageFlipping\");\n\n this.br.textSelectionPlugin?.stopPageFlip(this.br.refs.$brContainer);\n this.br.trigger('pageChanged');\n });\n });\n }\n\n /**\n * Whether we flip left or right is dependent on the page progression\n * to flip forward one spread, pass index=null\n * @param {number} index\n */\n flipFwdToIndex(index) {\n if (this.br.animating) return;\n\n if (null != this.br.leafEdgeTmp) {\n alert('error: leafEdgeTmp should be null!');\n return;\n }\n\n if (null == index) {\n // Need to use the max here, since it could be a right to left book\n const {currentIndexL, currentIndexR} = this.br.twoPage;\n const maxDisplayedIndex = Math.max(currentIndexL, currentIndexR);\n const nextPage = this.book.getPage(maxDisplayedIndex).findNext({ combineConsecutiveUnviewables: true });\n if (!nextPage) return;\n index = nextPage.index;\n }\n if (index > this.br.lastDisplayableIndex()) return;\n\n this.br.updateNavIndexThrottled(index);\n\n this.br.animating = true;\n\n const nextIndices = this.book.getSpreadIndices(index);\n\n if ('rl' != this.br.pageProgression) {\n // We did not specify RTL\n this.prepareFlipRightToLeft(nextIndices[0], nextIndices[1]);\n this.flipRightToLeft(nextIndices[0], nextIndices[1]);\n } else {\n // RTL\n this.prepareFlipLeftToRight(nextIndices[0], nextIndices[1]);\n this.flipLeftToRight(nextIndices[0], nextIndices[1]);\n }\n }\n\n /**\n * Flip from left to right and show the nextL and nextR indices on those sides\n * $$$ better not to have to pass gutter in\n * @param {number} newIndexL\n * @param {number} newIndexR\n */\n flipRightToLeft(newIndexL, newIndexR) {\n this.br.refs.$brContainer.addClass(\"BRpageFlipping\");\n\n const oldLeafEdgeWidthL = this.br.leafEdgeWidth(this.br.twoPage.currentIndexL);\n const oldLeafEdgeWidthR = this.br.twoPage.edgeWidth - oldLeafEdgeWidthL;\n const newLeafEdgeWidthL = this.br.leafEdgeWidth(newIndexL);\n const newLeafEdgeWidthR = this.br.twoPage.edgeWidth - newLeafEdgeWidthL;\n\n const leafEdgeTmpW = oldLeafEdgeWidthR - newLeafEdgeWidthR;\n\n const top = this.top();\n const scaledW = this.getPageWidth(this.br.twoPage.currentIndexR);\n\n const middle = this.br.twoPage.middle;\n const gutter = middle + this.gutterOffsetForIndex(newIndexL);\n\n const $twoPageViewEl = this.br.refs.$brTwoPageView;\n\n this.br.leafEdgeTmp = document.createElement('div');\n this.br.leafEdgeTmp.className = 'BRleafEdgeTmp';\n $(this.br.leafEdgeTmp).css({\n width: `${leafEdgeTmpW}px`,\n height: `${this.br.twoPage.height}px`,\n left: `${gutter + scaledW}px`,\n top: `${top}px`,\n zIndex:1000\n }).appendTo($twoPageViewEl);\n\n const newWidthL = this.getPageWidth(newIndexL);\n const newWidthR = this.getPageWidth(newIndexR);\n\n $(this.leafEdgeR).css({width: `${newLeafEdgeWidthR}px`, left: `${gutter + newWidthR}px` });\n const speed = this.br.flipSpeed;\n\n if (this.br.enableSearch) this.br.removeSearchHilites();\n\n $(this.br.leafEdgeTmp).animate({left: gutter}, speed, 'easeInSine');\n $(this.br.prefetchedImgs[this.br.twoPage.currentIndexR]).animate({width: '0px'}, speed, 'easeInSine', () => {\n this.br.$('BRgutter').css({left: `${gutter - this.br.twoPage.bookSpineDivWidth * 0.5}px`});\n $(this.br.leafEdgeTmp).animate({left: `${gutter - newWidthL - leafEdgeTmpW}px`}, speed, 'easeOutSine');\n $(this.br.prefetchedImgs[newIndexL]).animate({width: `${newWidthL}px`}, speed, 'easeOutSine', () => {\n $(this.br.prefetchedImgs[newIndexR]).css('zIndex', 2);\n\n //jquery adds display:block to the element style, which interferes with our print css\n $(this.br.prefetchedImgs[newIndexL]).css('display', '');\n $(this.br.prefetchedImgs[newIndexR]).css('display', '');\n\n $(this.leafEdgeL).css({\n width: `${newLeafEdgeWidthL}px`,\n left: `${gutter - newWidthL - newLeafEdgeWidthL}px`\n });\n\n // Resizes the book cover\n $(this.br.twoPage.coverDiv).css({\n width: `${this.coverWidth(newWidthL + newWidthR)}px`,\n left: `${gutter - newWidthL - newLeafEdgeWidthL - this.br.twoPage.coverInternalPadding}px`\n });\n\n $(this.br.leafEdgeTmp).remove();\n this.br.leafEdgeTmp = null;\n\n this.br.twoPage.currentIndexL = newIndexL;\n this.br.twoPage.currentIndexR = newIndexR;\n this.br.twoPage.scaledWL = newWidthL;\n this.br.twoPage.scaledWR = newWidthR;\n this.br.twoPage.gutter = gutter;\n\n this.br.updateFirstIndex(this.br.twoPage.currentIndexL);\n this.br.displayedIndices = [newIndexL, newIndexR];\n this.br.pruneUnusedImgs();\n this.br.prefetch();\n this.br.animating = false;\n\n\n if (this.br.enableSearch) this.br.updateSearchHilites();\n\n this.setMouseHandlers();\n\n if (this.br.animationFinishedCallback) {\n this.br.animationFinishedCallback();\n this.br.animationFinishedCallback = null;\n }\n\n this.br.refs.$brContainer.removeClass(\"BRpageFlipping\");\n\n this.br.textSelectionPlugin?.stopPageFlip(this.br.refs.$brContainer);\n this.br.trigger('pageChanged');\n });\n });\n }\n\n setMouseHandlers() {\n /**\n * @param {HTMLElement} element\n * @param {JQuery.MouseDownEvent\n Share\n \n
\n \n
`));\n }\n }\n}\n","/**\n * Bind mouse handlers\n * Disable mouse click to avoid selected/highlighted page images\n * @param {JQuery} jObject\n */\nexport function disableSelect(jObject) {\n // $$$ check here for right-click and don't disable. Also use jQuery style\n // for stopping propagation. See https://bugs.edge.launchpad.net/gnubook/+bug/362626\n jObject.bind('mousedown', () => false);\n // Special hack for IE7\n jObject[0].onselectstart = () => false;\n}\n\n/**\n * @param {number} value\n * @param {number} min\n * @param {number} max\n * @return {number}\n */\nexport function clamp(value, min, max) {\n return Math.min(Math.max(value, min), max);\n}\n\n/**\n * Given value and maximum, calculate a percentage suitable for CSS\n * @param {number} value\n * @param {number} max\n * @return {string}\n */\nexport function cssPercentage(value, max) {\n return ((value / max) * 100) + '%';\n}\n\n/**\n * @param {*} value\n * @param {Array} array\n * @return {boolean}\n */\nexport function notInArray(value, array) {\n return !array.includes(value);\n}\n\n/**\n * @param {HTMLIFrameElement} iframe\n * @return {Document}\n */\nexport function getIFrameDocument(iframe) {\n// Adapted from http://xkr.us/articles/dom/iframe-document/\n const outer = iframe.contentWindow || iframe.contentDocument;\n return outer.document || outer;\n}\n\n/**\n * @param {string} str\n * @return {string}\n */\nexport function escapeHTML(str) {\n return str.replace(/&/g,'&')\n .replace(/>/g,'>')\n .replace(/ {\n timeout = null;\n if (!immediate) func.apply(context, args);\n };\n const callNow = immediate && !timeout;\n clearTimeout(timeout);\n timeout = setTimeout(later, wait);\n if (callNow) func.apply(context, args);\n };\n}\n\n/**\n * Throttle function\n * @see https://remysharp.com/2010/07/21/throttling-function-calls\n * @param {Function} fn\n * @param {number} threshold\n * @param {boolean} delay\n * @return {Function}\n */\nexport function throttle(fn, threshold, delay) {\n threshold || (threshold = 250);\n let last;\n let deferTimer;\n if (delay) last = +new Date;\n return function () {\n const context = this;\n const now = +new Date;\n const args = arguments;\n if (last && now < last + threshold) {\n // hold on to it\n clearTimeout(deferTimer);\n deferTimer = setTimeout(() => {\n last = now;\n fn.apply(context, args);\n }, threshold);\n } else {\n last = now;\n fn.apply(context, args);\n }\n };\n}\n\n/**\n * FIXME we need a better way to do this :/ This is not automatically poly-filled by\n * core-js https://github.com/zloirock/core-js/issues/354\n * @param {Window} window\n */\nexport function polyfillCustomEvent(window) {\n if (typeof window.CustomEvent === \"function\") return false;\n window.CustomEvent = PolyfilledCustomEvent;\n}\n\n/**\n * https://caniuse.com/customevent has issues on older browsers where it can't be\n * called as a constructor, so we have to use older methods.\n * @param {String} eventName\n * @return {CustomEvent}\n */\nexport function PolyfilledCustomEvent(eventName, {bubbles = false, cancelable = false, detail = null} = {}) {\n const event = document.createEvent('CustomEvent');\n event.initCustomEvent(eventName, bubbles, cancelable, detail);\n return event;\n}\n","module.exports = function (it) {\n if (typeof it != 'function') {\n throw TypeError(String(it) + ' is not a function');\n } return it;\n};\n","var isObject = require('../internals/is-object');\n\nmodule.exports = function (it) {\n if (!isObject(it) && it !== null) {\n throw TypeError(\"Can't set \" + String(it) + ' as a prototype');\n } return it;\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\nvar create = require('../internals/object-create');\nvar definePropertyModule = require('../internals/object-define-property');\n\nvar UNSCOPABLES = wellKnownSymbol('unscopables');\nvar ArrayPrototype = Array.prototype;\n\n// Array.prototype[@@unscopables]\n// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables\nif (ArrayPrototype[UNSCOPABLES] == undefined) {\n definePropertyModule.f(ArrayPrototype, UNSCOPABLES, {\n configurable: true,\n value: create(null)\n });\n}\n\n// add a key to Array.prototype[@@unscopables]\nmodule.exports = function (key) {\n ArrayPrototype[UNSCOPABLES][key] = true;\n};\n","'use strict';\nvar charAt = require('../internals/string-multibyte').charAt;\n\n// `AdvanceStringIndex` abstract operation\n// https://tc39.github.io/ecma262/#sec-advancestringindex\nmodule.exports = function (S, index, unicode) {\n return index + (unicode ? charAt(S, index).length : 1);\n};\n","module.exports = function (it, Constructor, name) {\n if (!(it instanceof Constructor)) {\n throw TypeError('Incorrect ' + (name ? name + ' ' : '') + 'invocation');\n } return it;\n};\n","var isObject = require('../internals/is-object');\n\nmodule.exports = function (it) {\n if (!isObject(it)) {\n throw TypeError(String(it) + ' is not an object');\n } return it;\n};\n","'use strict';\nvar bind = require('../internals/function-bind-context');\nvar toObject = require('../internals/to-object');\nvar callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');\nvar isArrayIteratorMethod = require('../internals/is-array-iterator-method');\nvar toLength = require('../internals/to-length');\nvar createProperty = require('../internals/create-property');\nvar getIteratorMethod = require('../internals/get-iterator-method');\n\n// `Array.from` method implementation\n// https://tc39.github.io/ecma262/#sec-array.from\nmodule.exports = function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {\n var O = toObject(arrayLike);\n var C = typeof this == 'function' ? this : Array;\n var argumentsLength = arguments.length;\n var mapfn = argumentsLength > 1 ? arguments[1] : undefined;\n var mapping = mapfn !== undefined;\n var iteratorMethod = getIteratorMethod(O);\n var index = 0;\n var length, result, step, iterator, next, value;\n if (mapping) mapfn = bind(mapfn, argumentsLength > 2 ? arguments[2] : undefined, 2);\n // if the target is not iterable or it's an array with the default iterator - use a simple case\n if (iteratorMethod != undefined && !(C == Array && isArrayIteratorMethod(iteratorMethod))) {\n iterator = iteratorMethod.call(O);\n next = iterator.next;\n result = new C();\n for (;!(step = next.call(iterator)).done; index++) {\n value = mapping ? callWithSafeIterationClosing(iterator, mapfn, [step.value, index], true) : step.value;\n createProperty(result, index, value);\n }\n } else {\n length = toLength(O.length);\n result = new C(length);\n for (;length > index; index++) {\n value = mapping ? mapfn(O[index], index) : O[index];\n createProperty(result, index, value);\n }\n }\n result.length = index;\n return result;\n};\n","var toIndexedObject = require('../internals/to-indexed-object');\nvar toLength = require('../internals/to-length');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\n\n// `Array.prototype.{ indexOf, includes }` methods implementation\nvar createMethod = function (IS_INCLUDES) {\n return function ($this, el, fromIndex) {\n var O = toIndexedObject($this);\n var length = toLength(O.length);\n var index = toAbsoluteIndex(fromIndex, length);\n var value;\n // Array#includes uses SameValueZero equality algorithm\n // eslint-disable-next-line no-self-compare\n if (IS_INCLUDES && el != el) while (length > index) {\n value = O[index++];\n // eslint-disable-next-line no-self-compare\n if (value != value) return true;\n // Array#indexOf ignores holes, Array#includes - not\n } else for (;length > index; index++) {\n if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;\n } return !IS_INCLUDES && -1;\n };\n};\n\nmodule.exports = {\n // `Array.prototype.includes` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.includes\n includes: createMethod(true),\n // `Array.prototype.indexOf` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.indexof\n indexOf: createMethod(false)\n};\n","var bind = require('../internals/function-bind-context');\nvar IndexedObject = require('../internals/indexed-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar arraySpeciesCreate = require('../internals/array-species-create');\n\nvar push = [].push;\n\n// `Array.prototype.{ forEach, map, filter, some, every, find, findIndex }` methods implementation\nvar createMethod = function (TYPE) {\n var IS_MAP = TYPE == 1;\n var IS_FILTER = TYPE == 2;\n var IS_SOME = TYPE == 3;\n var IS_EVERY = TYPE == 4;\n var IS_FIND_INDEX = TYPE == 6;\n var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;\n return function ($this, callbackfn, that, specificCreate) {\n var O = toObject($this);\n var self = IndexedObject(O);\n var boundFunction = bind(callbackfn, that, 3);\n var length = toLength(self.length);\n var index = 0;\n var create = specificCreate || arraySpeciesCreate;\n var target = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined;\n var value, result;\n for (;length > index; index++) if (NO_HOLES || index in self) {\n value = self[index];\n result = boundFunction(value, index, O);\n if (TYPE) {\n if (IS_MAP) target[index] = result; // map\n else if (result) switch (TYPE) {\n case 3: return true; // some\n case 5: return value; // find\n case 6: return index; // findIndex\n case 2: push.call(target, value); // filter\n } else if (IS_EVERY) return false; // every\n }\n }\n return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;\n };\n};\n\nmodule.exports = {\n // `Array.prototype.forEach` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.foreach\n forEach: createMethod(0),\n // `Array.prototype.map` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.map\n map: createMethod(1),\n // `Array.prototype.filter` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.filter\n filter: createMethod(2),\n // `Array.prototype.some` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.some\n some: createMethod(3),\n // `Array.prototype.every` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.every\n every: createMethod(4),\n // `Array.prototype.find` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.find\n find: createMethod(5),\n // `Array.prototype.findIndex` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.findIndex\n findIndex: createMethod(6)\n};\n","var fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar SPECIES = wellKnownSymbol('species');\n\nmodule.exports = function (METHOD_NAME) {\n // We can't use this feature detection in V8 since it causes\n // deoptimization and serious performance degradation\n // https://github.com/zloirock/core-js/issues/677\n return V8_VERSION >= 51 || !fails(function () {\n var array = [];\n var constructor = array.constructor = {};\n constructor[SPECIES] = function () {\n return { foo: 1 };\n };\n return array[METHOD_NAME](Boolean).foo !== 1;\n });\n};\n","'use strict';\nvar fails = require('../internals/fails');\n\nmodule.exports = function (METHOD_NAME, argument) {\n var method = [][METHOD_NAME];\n return !!method && fails(function () {\n // eslint-disable-next-line no-useless-call,no-throw-literal\n method.call(null, argument || function () { throw 1; }, 1);\n });\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar has = require('../internals/has');\n\nvar defineProperty = Object.defineProperty;\nvar cache = {};\n\nvar thrower = function (it) { throw it; };\n\nmodule.exports = function (METHOD_NAME, options) {\n if (has(cache, METHOD_NAME)) return cache[METHOD_NAME];\n if (!options) options = {};\n var method = [][METHOD_NAME];\n var ACCESSORS = has(options, 'ACCESSORS') ? options.ACCESSORS : false;\n var argument0 = has(options, 0) ? options[0] : thrower;\n var argument1 = has(options, 1) ? options[1] : undefined;\n\n return cache[METHOD_NAME] = !!method && !fails(function () {\n if (ACCESSORS && !DESCRIPTORS) return true;\n var O = { length: -1 };\n\n if (ACCESSORS) defineProperty(O, 1, { enumerable: true, get: thrower });\n else O[1] = 1;\n\n method.call(O, argument0, argument1);\n });\n};\n","var aFunction = require('../internals/a-function');\nvar toObject = require('../internals/to-object');\nvar IndexedObject = require('../internals/indexed-object');\nvar toLength = require('../internals/to-length');\n\n// `Array.prototype.{ reduce, reduceRight }` methods implementation\nvar createMethod = function (IS_RIGHT) {\n return function (that, callbackfn, argumentsLength, memo) {\n aFunction(callbackfn);\n var O = toObject(that);\n var self = IndexedObject(O);\n var length = toLength(O.length);\n var index = IS_RIGHT ? length - 1 : 0;\n var i = IS_RIGHT ? -1 : 1;\n if (argumentsLength < 2) while (true) {\n if (index in self) {\n memo = self[index];\n index += i;\n break;\n }\n index += i;\n if (IS_RIGHT ? index < 0 : length <= index) {\n throw TypeError('Reduce of empty array with no initial value');\n }\n }\n for (;IS_RIGHT ? index >= 0 : length > index; index += i) if (index in self) {\n memo = callbackfn(memo, self[index], index, O);\n }\n return memo;\n };\n};\n\nmodule.exports = {\n // `Array.prototype.reduce` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.reduce\n left: createMethod(false),\n // `Array.prototype.reduceRight` method\n // https://tc39.github.io/ecma262/#sec-array.prototype.reduceright\n right: createMethod(true)\n};\n","var isObject = require('../internals/is-object');\nvar isArray = require('../internals/is-array');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar SPECIES = wellKnownSymbol('species');\n\n// `ArraySpeciesCreate` abstract operation\n// https://tc39.github.io/ecma262/#sec-arrayspeciescreate\nmodule.exports = function (originalArray, length) {\n var C;\n if (isArray(originalArray)) {\n C = originalArray.constructor;\n // cross-realm fallback\n if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;\n else if (isObject(C)) {\n C = C[SPECIES];\n if (C === null) C = undefined;\n }\n } return new (C === undefined ? Array : C)(length === 0 ? 0 : length);\n};\n","var anObject = require('../internals/an-object');\n\n// call something on iterator step with safe closing on error\nmodule.exports = function (iterator, fn, value, ENTRIES) {\n try {\n return ENTRIES ? fn(anObject(value)[0], value[1]) : fn(value);\n // 7.4.6 IteratorClose(iterator, completion)\n } catch (error) {\n var returnMethod = iterator['return'];\n if (returnMethod !== undefined) anObject(returnMethod.call(iterator));\n throw error;\n }\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar SAFE_CLOSING = false;\n\ntry {\n var called = 0;\n var iteratorWithReturn = {\n next: function () {\n return { done: !!called++ };\n },\n 'return': function () {\n SAFE_CLOSING = true;\n }\n };\n iteratorWithReturn[ITERATOR] = function () {\n return this;\n };\n // eslint-disable-next-line no-throw-literal\n Array.from(iteratorWithReturn, function () { throw 2; });\n} catch (error) { /* empty */ }\n\nmodule.exports = function (exec, SKIP_CLOSING) {\n if (!SKIP_CLOSING && !SAFE_CLOSING) return false;\n var ITERATION_SUPPORT = false;\n try {\n var object = {};\n object[ITERATOR] = function () {\n return {\n next: function () {\n return { done: ITERATION_SUPPORT = true };\n }\n };\n };\n exec(object);\n } catch (error) { /* empty */ }\n return ITERATION_SUPPORT;\n};\n","var toString = {}.toString;\n\nmodule.exports = function (it) {\n return toString.call(it).slice(8, -1);\n};\n","var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar classofRaw = require('../internals/classof-raw');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\n// ES3 wrong here\nvar CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';\n\n// fallback for IE11 Script Access Denied error\nvar tryGet = function (it, key) {\n try {\n return it[key];\n } catch (error) { /* empty */ }\n};\n\n// getting tag from ES6+ `Object.prototype.toString`\nmodule.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {\n var O, tag, result;\n return it === undefined ? 'Undefined' : it === null ? 'Null'\n // @@toStringTag case\n : typeof (tag = tryGet(O = Object(it), TO_STRING_TAG)) == 'string' ? tag\n // builtinTag case\n : CORRECT_ARGUMENTS ? classofRaw(O)\n // ES3 arguments fallback\n : (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;\n};\n","var has = require('../internals/has');\nvar ownKeys = require('../internals/own-keys');\nvar getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');\nvar definePropertyModule = require('../internals/object-define-property');\n\nmodule.exports = function (target, source) {\n var keys = ownKeys(source);\n var defineProperty = definePropertyModule.f;\n var getOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;\n for (var i = 0; i < keys.length; i++) {\n var key = keys[i];\n if (!has(target, key)) defineProperty(target, key, getOwnPropertyDescriptor(source, key));\n }\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar MATCH = wellKnownSymbol('match');\n\nmodule.exports = function (METHOD_NAME) {\n var regexp = /./;\n try {\n '/./'[METHOD_NAME](regexp);\n } catch (e) {\n try {\n regexp[MATCH] = false;\n return '/./'[METHOD_NAME](regexp);\n } catch (f) { /* empty */ }\n } return false;\n};\n","var fails = require('../internals/fails');\n\nmodule.exports = !fails(function () {\n function F() { /* empty */ }\n F.prototype.constructor = null;\n return Object.getPrototypeOf(new F()) !== F.prototype;\n});\n","'use strict';\nvar IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;\nvar create = require('../internals/object-create');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar Iterators = require('../internals/iterators');\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (IteratorConstructor, NAME, next) {\n var TO_STRING_TAG = NAME + ' Iterator';\n IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(1, next) });\n setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);\n Iterators[TO_STRING_TAG] = returnThis;\n return IteratorConstructor;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar definePropertyModule = require('../internals/object-define-property');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\n\nmodule.exports = DESCRIPTORS ? function (object, key, value) {\n return definePropertyModule.f(object, key, createPropertyDescriptor(1, value));\n} : function (object, key, value) {\n object[key] = value;\n return object;\n};\n","module.exports = function (bitmap, value) {\n return {\n enumerable: !(bitmap & 1),\n configurable: !(bitmap & 2),\n writable: !(bitmap & 4),\n value: value\n };\n};\n","'use strict';\nvar toPrimitive = require('../internals/to-primitive');\nvar definePropertyModule = require('../internals/object-define-property');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\n\nmodule.exports = function (object, key, value) {\n var propertyKey = toPrimitive(key);\n if (propertyKey in object) definePropertyModule.f(object, propertyKey, createPropertyDescriptor(0, value));\n else object[propertyKey] = value;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar createIteratorConstructor = require('../internals/create-iterator-constructor');\nvar getPrototypeOf = require('../internals/object-get-prototype-of');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\nvar Iterators = require('../internals/iterators');\nvar IteratorsCore = require('../internals/iterators-core');\n\nvar IteratorPrototype = IteratorsCore.IteratorPrototype;\nvar BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;\nvar ITERATOR = wellKnownSymbol('iterator');\nvar KEYS = 'keys';\nvar VALUES = 'values';\nvar ENTRIES = 'entries';\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {\n createIteratorConstructor(IteratorConstructor, NAME, next);\n\n var getIterationMethod = function (KIND) {\n if (KIND === DEFAULT && defaultIterator) return defaultIterator;\n if (!BUGGY_SAFARI_ITERATORS && KIND in IterablePrototype) return IterablePrototype[KIND];\n switch (KIND) {\n case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };\n case VALUES: return function values() { return new IteratorConstructor(this, KIND); };\n case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };\n } return function () { return new IteratorConstructor(this); };\n };\n\n var TO_STRING_TAG = NAME + ' Iterator';\n var INCORRECT_VALUES_NAME = false;\n var IterablePrototype = Iterable.prototype;\n var nativeIterator = IterablePrototype[ITERATOR]\n || IterablePrototype['@@iterator']\n || DEFAULT && IterablePrototype[DEFAULT];\n var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);\n var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;\n var CurrentIteratorPrototype, methods, KEY;\n\n // fix native\n if (anyNativeIterator) {\n CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));\n if (IteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {\n if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {\n if (setPrototypeOf) {\n setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);\n } else if (typeof CurrentIteratorPrototype[ITERATOR] != 'function') {\n createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR, returnThis);\n }\n }\n // Set @@toStringTag to native iterators\n setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);\n if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;\n }\n }\n\n // fix Array#{values, @@iterator}.name in V8 / FF\n if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {\n INCORRECT_VALUES_NAME = true;\n defaultIterator = function values() { return nativeIterator.call(this); };\n }\n\n // define iterator\n if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {\n createNonEnumerableProperty(IterablePrototype, ITERATOR, defaultIterator);\n }\n Iterators[NAME] = defaultIterator;\n\n // export additional methods\n if (DEFAULT) {\n methods = {\n values: getIterationMethod(VALUES),\n keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),\n entries: getIterationMethod(ENTRIES)\n };\n if (FORCED) for (KEY in methods) {\n if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {\n redefine(IterablePrototype, KEY, methods[KEY]);\n }\n } else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);\n }\n\n return methods;\n};\n","var path = require('../internals/path');\nvar has = require('../internals/has');\nvar wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');\nvar defineProperty = require('../internals/object-define-property').f;\n\nmodule.exports = function (NAME) {\n var Symbol = path.Symbol || (path.Symbol = {});\n if (!has(Symbol, NAME)) defineProperty(Symbol, NAME, {\n value: wrappedWellKnownSymbolModule.f(NAME)\n });\n};\n","var fails = require('../internals/fails');\n\n// Thank's IE8 for his funny defineProperty\nmodule.exports = !fails(function () {\n return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] != 7;\n});\n","var global = require('../internals/global');\nvar isObject = require('../internals/is-object');\n\nvar document = global.document;\n// typeof document.createElement is 'object' in old IE\nvar EXISTS = isObject(document) && isObject(document.createElement);\n\nmodule.exports = function (it) {\n return EXISTS ? document.createElement(it) : {};\n};\n","// iterable DOM collections\n// flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods\nmodule.exports = {\n CSSRuleList: 0,\n CSSStyleDeclaration: 0,\n CSSValueList: 0,\n ClientRectList: 0,\n DOMRectList: 0,\n DOMStringList: 0,\n DOMTokenList: 1,\n DataTransferItemList: 0,\n FileList: 0,\n HTMLAllCollection: 0,\n HTMLCollection: 0,\n HTMLFormElement: 0,\n HTMLSelectElement: 0,\n MediaList: 0,\n MimeTypeArray: 0,\n NamedNodeMap: 0,\n NodeList: 1,\n PaintRequestList: 0,\n Plugin: 0,\n PluginArray: 0,\n SVGLengthList: 0,\n SVGNumberList: 0,\n SVGPathSegList: 0,\n SVGPointList: 0,\n SVGStringList: 0,\n SVGTransformList: 0,\n SourceBufferList: 0,\n StyleSheetList: 0,\n TextTrackCueList: 0,\n TextTrackList: 0,\n TouchList: 0\n};\n","var getBuiltIn = require('../internals/get-built-in');\n\nmodule.exports = getBuiltIn('navigator', 'userAgent') || '';\n","var global = require('../internals/global');\nvar userAgent = require('../internals/engine-user-agent');\n\nvar process = global.process;\nvar versions = process && process.versions;\nvar v8 = versions && versions.v8;\nvar match, version;\n\nif (v8) {\n match = v8.split('.');\n version = match[0] + match[1];\n} else if (userAgent) {\n match = userAgent.match(/Edge\\/(\\d+)/);\n if (!match || match[1] >= 74) {\n match = userAgent.match(/Chrome\\/(\\d+)/);\n if (match) version = match[1];\n }\n}\n\nmodule.exports = version && +version;\n","// IE8- don't enum bug keys\nmodule.exports = [\n 'constructor',\n 'hasOwnProperty',\n 'isPrototypeOf',\n 'propertyIsEnumerable',\n 'toLocaleString',\n 'toString',\n 'valueOf'\n];\n","var global = require('../internals/global');\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar setGlobal = require('../internals/set-global');\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\nvar isForced = require('../internals/is-forced');\n\n/*\n options.target - name of the target object\n options.global - target is the global object\n options.stat - export as static methods of target\n options.proto - export as prototype methods of target\n options.real - real prototype method for the `pure` version\n options.forced - export even if the native feature is available\n options.bind - bind methods to the target, required for the `pure` version\n options.wrap - wrap constructors to preventing global pollution, required for the `pure` version\n options.unsafe - use the simple assignment of property instead of delete + defineProperty\n options.sham - add a flag to not completely full polyfills\n options.enumerable - export as enumerable property\n options.noTargetGet - prevent calling a getter on target\n*/\nmodule.exports = function (options, source) {\n var TARGET = options.target;\n var GLOBAL = options.global;\n var STATIC = options.stat;\n var FORCED, target, key, targetProperty, sourceProperty, descriptor;\n if (GLOBAL) {\n target = global;\n } else if (STATIC) {\n target = global[TARGET] || setGlobal(TARGET, {});\n } else {\n target = (global[TARGET] || {}).prototype;\n }\n if (target) for (key in source) {\n sourceProperty = source[key];\n if (options.noTargetGet) {\n descriptor = getOwnPropertyDescriptor(target, key);\n targetProperty = descriptor && descriptor.value;\n } else targetProperty = target[key];\n FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);\n // contained in target\n if (!FORCED && targetProperty !== undefined) {\n if (typeof sourceProperty === typeof targetProperty) continue;\n copyConstructorProperties(sourceProperty, targetProperty);\n }\n // add a flag to not completely full polyfills\n if (options.sham || (targetProperty && targetProperty.sham)) {\n createNonEnumerableProperty(sourceProperty, 'sham', true);\n }\n // extend global\n redefine(target, key, sourceProperty, options);\n }\n};\n","module.exports = function (exec) {\n try {\n return !!exec();\n } catch (error) {\n return true;\n }\n};\n","'use strict';\n// TODO: Remove from `core-js@4` since it's moved to entry points\nrequire('../modules/es.regexp.exec');\nvar redefine = require('../internals/redefine');\nvar fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar regexpExec = require('../internals/regexp-exec');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nvar SPECIES = wellKnownSymbol('species');\n\nvar REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {\n // #replace needs built-in support for named groups.\n // #match works fine because it just return the exec results, even if it has\n // a \"grops\" property.\n var re = /./;\n re.exec = function () {\n var result = [];\n result.groups = { a: '7' };\n return result;\n };\n return ''.replace(re, '$') !== '7';\n});\n\n// IE <= 11 replaces $0 with the whole match, as if it was $&\n// https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0\nvar REPLACE_KEEPS_$0 = (function () {\n return 'a'.replace(/./, '$0') === '$0';\n})();\n\nvar REPLACE = wellKnownSymbol('replace');\n// Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string\nvar REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = (function () {\n if (/./[REPLACE]) {\n return /./[REPLACE]('a', '$0') === '';\n }\n return false;\n})();\n\n// Chrome 51 has a buggy \"split\" implementation when RegExp#exec !== nativeExec\n// Weex JS has frozen built-in prototypes, so use try / catch wrapper\nvar SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {\n var re = /(?:)/;\n var originalExec = re.exec;\n re.exec = function () { return originalExec.apply(this, arguments); };\n var result = 'ab'.split(re);\n return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';\n});\n\nmodule.exports = function (KEY, length, exec, sham) {\n var SYMBOL = wellKnownSymbol(KEY);\n\n var DELEGATES_TO_SYMBOL = !fails(function () {\n // String methods call symbol-named RegEp methods\n var O = {};\n O[SYMBOL] = function () { return 7; };\n return ''[KEY](O) != 7;\n });\n\n var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {\n // Symbol-named RegExp methods call .exec\n var execCalled = false;\n var re = /a/;\n\n if (KEY === 'split') {\n // We can't use real regex here since it causes deoptimization\n // and serious performance degradation in V8\n // https://github.com/zloirock/core-js/issues/306\n re = {};\n // RegExp[@@split] doesn't call the regex's exec method, but first creates\n // a new one. We need to return the patched regex when creating the new one.\n re.constructor = {};\n re.constructor[SPECIES] = function () { return re; };\n re.flags = '';\n re[SYMBOL] = /./[SYMBOL];\n }\n\n re.exec = function () { execCalled = true; return null; };\n\n re[SYMBOL]('');\n return !execCalled;\n });\n\n if (\n !DELEGATES_TO_SYMBOL ||\n !DELEGATES_TO_EXEC ||\n (KEY === 'replace' && !(\n REPLACE_SUPPORTS_NAMED_GROUPS &&\n REPLACE_KEEPS_$0 &&\n !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE\n )) ||\n (KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC)\n ) {\n var nativeRegExpMethod = /./[SYMBOL];\n var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {\n if (regexp.exec === regexpExec) {\n if (DELEGATES_TO_SYMBOL && !forceStringMethod) {\n // The native String method already delegates to @@method (this\n // polyfilled function), leasing to infinite recursion.\n // We avoid it by directly calling the native @@method method.\n return { done: true, value: nativeRegExpMethod.call(regexp, str, arg2) };\n }\n return { done: true, value: nativeMethod.call(str, regexp, arg2) };\n }\n return { done: false };\n }, {\n REPLACE_KEEPS_$0: REPLACE_KEEPS_$0,\n REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE: REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE\n });\n var stringMethod = methods[0];\n var regexMethod = methods[1];\n\n redefine(String.prototype, KEY, stringMethod);\n redefine(RegExp.prototype, SYMBOL, length == 2\n // 21.2.5.8 RegExp.prototype[@@replace](string, replaceValue)\n // 21.2.5.11 RegExp.prototype[@@split](string, limit)\n ? function (string, arg) { return regexMethod.call(string, this, arg); }\n // 21.2.5.6 RegExp.prototype[@@match](string)\n // 21.2.5.9 RegExp.prototype[@@search](string)\n : function (string) { return regexMethod.call(string, this); }\n );\n }\n\n if (sham) createNonEnumerableProperty(RegExp.prototype[SYMBOL], 'sham', true);\n};\n","'use strict';\nvar isArray = require('../internals/is-array');\nvar toLength = require('../internals/to-length');\nvar bind = require('../internals/function-bind-context');\n\n// `FlattenIntoArray` abstract operation\n// https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray\nvar flattenIntoArray = function (target, original, source, sourceLen, start, depth, mapper, thisArg) {\n var targetIndex = start;\n var sourceIndex = 0;\n var mapFn = mapper ? bind(mapper, thisArg, 3) : false;\n var element;\n\n while (sourceIndex < sourceLen) {\n if (sourceIndex in source) {\n element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];\n\n if (depth > 0 && isArray(element)) {\n targetIndex = flattenIntoArray(target, original, element, toLength(element.length), targetIndex, depth - 1) - 1;\n } else {\n if (targetIndex >= 0x1FFFFFFFFFFFFF) throw TypeError('Exceed the acceptable array length');\n target[targetIndex] = element;\n }\n\n targetIndex++;\n }\n sourceIndex++;\n }\n return targetIndex;\n};\n\nmodule.exports = flattenIntoArray;\n","var aFunction = require('../internals/a-function');\n\n// optional / simple context binding\nmodule.exports = function (fn, that, length) {\n aFunction(fn);\n if (that === undefined) return fn;\n switch (length) {\n case 0: return function () {\n return fn.call(that);\n };\n case 1: return function (a) {\n return fn.call(that, a);\n };\n case 2: return function (a, b) {\n return fn.call(that, a, b);\n };\n case 3: return function (a, b, c) {\n return fn.call(that, a, b, c);\n };\n }\n return function (/* ...args */) {\n return fn.apply(that, arguments);\n };\n};\n","var path = require('../internals/path');\nvar global = require('../internals/global');\n\nvar aFunction = function (variable) {\n return typeof variable == 'function' ? variable : undefined;\n};\n\nmodule.exports = function (namespace, method) {\n return arguments.length < 2 ? aFunction(path[namespace]) || aFunction(global[namespace])\n : path[namespace] && path[namespace][method] || global[namespace] && global[namespace][method];\n};\n","var classof = require('../internals/classof');\nvar Iterators = require('../internals/iterators');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\n\nmodule.exports = function (it) {\n if (it != undefined) return it[ITERATOR]\n || it['@@iterator']\n || Iterators[classof(it)];\n};\n","var anObject = require('../internals/an-object');\nvar getIteratorMethod = require('../internals/get-iterator-method');\n\nmodule.exports = function (it) {\n var iteratorMethod = getIteratorMethod(it);\n if (typeof iteratorMethod != 'function') {\n throw TypeError(String(it) + ' is not iterable');\n } return anObject(iteratorMethod.call(it));\n};\n","var check = function (it) {\n return it && it.Math == Math && it;\n};\n\n// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028\nmodule.exports =\n // eslint-disable-next-line no-undef\n check(typeof globalThis == 'object' && globalThis) ||\n check(typeof window == 'object' && window) ||\n check(typeof self == 'object' && self) ||\n check(typeof global == 'object' && global) ||\n // eslint-disable-next-line no-new-func\n Function('return this')();\n","var hasOwnProperty = {}.hasOwnProperty;\n\nmodule.exports = function (it, key) {\n return hasOwnProperty.call(it, key);\n};\n","module.exports = {};\n","var getBuiltIn = require('../internals/get-built-in');\n\nmodule.exports = getBuiltIn('document', 'documentElement');\n","var DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar createElement = require('../internals/document-create-element');\n\n// Thank's IE8 for his funny defineProperty\nmodule.exports = !DESCRIPTORS && !fails(function () {\n return Object.defineProperty(createElement('div'), 'a', {\n get: function () { return 7; }\n }).a != 7;\n});\n","var fails = require('../internals/fails');\nvar classof = require('../internals/classof-raw');\n\nvar split = ''.split;\n\n// fallback for non-array-like ES3 and non-enumerable old V8 strings\nmodule.exports = fails(function () {\n // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346\n // eslint-disable-next-line no-prototype-builtins\n return !Object('z').propertyIsEnumerable(0);\n}) ? function (it) {\n return classof(it) == 'String' ? split.call(it, '') : Object(it);\n} : Object;\n","var store = require('../internals/shared-store');\n\nvar functionToString = Function.toString;\n\n// this helper broken in `3.4.1-3.4.4`, so we can't use `shared` helper\nif (typeof store.inspectSource != 'function') {\n store.inspectSource = function (it) {\n return functionToString.call(it);\n };\n}\n\nmodule.exports = store.inspectSource;\n","var NATIVE_WEAK_MAP = require('../internals/native-weak-map');\nvar global = require('../internals/global');\nvar isObject = require('../internals/is-object');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar objectHas = require('../internals/has');\nvar sharedKey = require('../internals/shared-key');\nvar hiddenKeys = require('../internals/hidden-keys');\n\nvar WeakMap = global.WeakMap;\nvar set, get, has;\n\nvar enforce = function (it) {\n return has(it) ? get(it) : set(it, {});\n};\n\nvar getterFor = function (TYPE) {\n return function (it) {\n var state;\n if (!isObject(it) || (state = get(it)).type !== TYPE) {\n throw TypeError('Incompatible receiver, ' + TYPE + ' required');\n } return state;\n };\n};\n\nif (NATIVE_WEAK_MAP) {\n var store = new WeakMap();\n var wmget = store.get;\n var wmhas = store.has;\n var wmset = store.set;\n set = function (it, metadata) {\n wmset.call(store, it, metadata);\n return metadata;\n };\n get = function (it) {\n return wmget.call(store, it) || {};\n };\n has = function (it) {\n return wmhas.call(store, it);\n };\n} else {\n var STATE = sharedKey('state');\n hiddenKeys[STATE] = true;\n set = function (it, metadata) {\n createNonEnumerableProperty(it, STATE, metadata);\n return metadata;\n };\n get = function (it) {\n return objectHas(it, STATE) ? it[STATE] : {};\n };\n has = function (it) {\n return objectHas(it, STATE);\n };\n}\n\nmodule.exports = {\n set: set,\n get: get,\n has: has,\n enforce: enforce,\n getterFor: getterFor\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\nvar Iterators = require('../internals/iterators');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar ArrayPrototype = Array.prototype;\n\n// check on default Array iterator\nmodule.exports = function (it) {\n return it !== undefined && (Iterators.Array === it || ArrayPrototype[ITERATOR] === it);\n};\n","var classof = require('../internals/classof-raw');\n\n// `IsArray` abstract operation\n// https://tc39.github.io/ecma262/#sec-isarray\nmodule.exports = Array.isArray || function isArray(arg) {\n return classof(arg) == 'Array';\n};\n","var fails = require('../internals/fails');\n\nvar replacement = /#|\\.prototype\\./;\n\nvar isForced = function (feature, detection) {\n var value = data[normalize(feature)];\n return value == POLYFILL ? true\n : value == NATIVE ? false\n : typeof detection == 'function' ? fails(detection)\n : !!detection;\n};\n\nvar normalize = isForced.normalize = function (string) {\n return String(string).replace(replacement, '.').toLowerCase();\n};\n\nvar data = isForced.data = {};\nvar NATIVE = isForced.NATIVE = 'N';\nvar POLYFILL = isForced.POLYFILL = 'P';\n\nmodule.exports = isForced;\n","module.exports = function (it) {\n return typeof it === 'object' ? it !== null : typeof it === 'function';\n};\n","module.exports = false;\n","var isObject = require('../internals/is-object');\nvar classof = require('../internals/classof-raw');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar MATCH = wellKnownSymbol('match');\n\n// `IsRegExp` abstract operation\n// https://tc39.github.io/ecma262/#sec-isregexp\nmodule.exports = function (it) {\n var isRegExp;\n return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) == 'RegExp');\n};\n","'use strict';\nvar getPrototypeOf = require('../internals/object-get-prototype-of');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar has = require('../internals/has');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar BUGGY_SAFARI_ITERATORS = false;\n\nvar returnThis = function () { return this; };\n\n// `%IteratorPrototype%` object\n// https://tc39.github.io/ecma262/#sec-%iteratorprototype%-object\nvar IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;\n\nif ([].keys) {\n arrayIterator = [].keys();\n // Safari 8 has buggy iterators w/o `next`\n if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;\n else {\n PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));\n if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;\n }\n}\n\nif (IteratorPrototype == undefined) IteratorPrototype = {};\n\n// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()\nif (!IS_PURE && !has(IteratorPrototype, ITERATOR)) {\n createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);\n}\n\nmodule.exports = {\n IteratorPrototype: IteratorPrototype,\n BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS\n};\n","module.exports = {};\n","var fails = require('../internals/fails');\n\nmodule.exports = !!Object.getOwnPropertySymbols && !fails(function () {\n // Chrome 38 Symbol has incorrect toString conversion\n // eslint-disable-next-line no-undef\n return !String(Symbol());\n});\n","var fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\n\nvar ITERATOR = wellKnownSymbol('iterator');\n\nmodule.exports = !fails(function () {\n var url = new URL('b?a=1&b=2&c=3', 'http://a');\n var searchParams = url.searchParams;\n var result = '';\n url.pathname = 'c%20d';\n searchParams.forEach(function (value, key) {\n searchParams['delete']('b');\n result += key + value;\n });\n return (IS_PURE && !url.toJSON)\n || !searchParams.sort\n || url.href !== 'http://a/c%20d?a=1&c=3'\n || searchParams.get('c') !== '3'\n || String(new URLSearchParams('?a=1')) !== 'a=1'\n || !searchParams[ITERATOR]\n // throws in Edge\n || new URL('https://a@b').username !== 'a'\n || new URLSearchParams(new URLSearchParams('a=b')).get('a') !== 'b'\n // not punycoded in Edge\n || new URL('http://тест').host !== 'xn--e1aybc'\n // not escaped in Chrome 62-\n || new URL('http://a#б').hash !== '#%D0%B1'\n // fails in Chrome 66-\n || result !== 'a1c3'\n // throws in Safari\n || new URL('http://x', undefined).host !== 'x';\n});\n","var global = require('../internals/global');\nvar inspectSource = require('../internals/inspect-source');\n\nvar WeakMap = global.WeakMap;\n\nmodule.exports = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));\n","var isRegExp = require('../internals/is-regexp');\n\nmodule.exports = function (it) {\n if (isRegExp(it)) {\n throw TypeError(\"The method doesn't accept regular expressions\");\n } return it;\n};\n","'use strict';\nvar DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar objectKeys = require('../internals/object-keys');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar toObject = require('../internals/to-object');\nvar IndexedObject = require('../internals/indexed-object');\n\nvar nativeAssign = Object.assign;\nvar defineProperty = Object.defineProperty;\n\n// `Object.assign` method\n// https://tc39.github.io/ecma262/#sec-object.assign\nmodule.exports = !nativeAssign || fails(function () {\n // should have correct order of operations (Edge bug)\n if (DESCRIPTORS && nativeAssign({ b: 1 }, nativeAssign(defineProperty({}, 'a', {\n enumerable: true,\n get: function () {\n defineProperty(this, 'b', {\n value: 3,\n enumerable: false\n });\n }\n }), { b: 2 })).b !== 1) return true;\n // should work with symbols and should have deterministic property order (V8 bug)\n var A = {};\n var B = {};\n // eslint-disable-next-line no-undef\n var symbol = Symbol();\n var alphabet = 'abcdefghijklmnopqrst';\n A[symbol] = 7;\n alphabet.split('').forEach(function (chr) { B[chr] = chr; });\n return nativeAssign({}, A)[symbol] != 7 || objectKeys(nativeAssign({}, B)).join('') != alphabet;\n}) ? function assign(target, source) { // eslint-disable-line no-unused-vars\n var T = toObject(target);\n var argumentsLength = arguments.length;\n var index = 1;\n var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;\n var propertyIsEnumerable = propertyIsEnumerableModule.f;\n while (argumentsLength > index) {\n var S = IndexedObject(arguments[index++]);\n var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);\n var length = keys.length;\n var j = 0;\n var key;\n while (length > j) {\n key = keys[j++];\n if (!DESCRIPTORS || propertyIsEnumerable.call(S, key)) T[key] = S[key];\n }\n } return T;\n} : nativeAssign;\n","var anObject = require('../internals/an-object');\nvar defineProperties = require('../internals/object-define-properties');\nvar enumBugKeys = require('../internals/enum-bug-keys');\nvar hiddenKeys = require('../internals/hidden-keys');\nvar html = require('../internals/html');\nvar documentCreateElement = require('../internals/document-create-element');\nvar sharedKey = require('../internals/shared-key');\n\nvar GT = '>';\nvar LT = '<';\nvar PROTOTYPE = 'prototype';\nvar SCRIPT = 'script';\nvar IE_PROTO = sharedKey('IE_PROTO');\n\nvar EmptyConstructor = function () { /* empty */ };\n\nvar scriptTag = function (content) {\n return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;\n};\n\n// Create object with fake `null` prototype: use ActiveX Object with cleared prototype\nvar NullProtoObjectViaActiveX = function (activeXDocument) {\n activeXDocument.write(scriptTag(''));\n activeXDocument.close();\n var temp = activeXDocument.parentWindow.Object;\n activeXDocument = null; // avoid memory leak\n return temp;\n};\n\n// Create object with fake `null` prototype: use iframe Object with cleared prototype\nvar NullProtoObjectViaIFrame = function () {\n // Thrash, waste and sodomy: IE GC bug\n var iframe = documentCreateElement('iframe');\n var JS = 'java' + SCRIPT + ':';\n var iframeDocument;\n iframe.style.display = 'none';\n html.appendChild(iframe);\n // https://github.com/zloirock/core-js/issues/475\n iframe.src = String(JS);\n iframeDocument = iframe.contentWindow.document;\n iframeDocument.open();\n iframeDocument.write(scriptTag('document.F=Object'));\n iframeDocument.close();\n return iframeDocument.F;\n};\n\n// Check for document.domain and active x support\n// No need to use active x approach when document.domain is not set\n// see https://github.com/es-shims/es5-shim/issues/150\n// variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346\n// avoid IE GC bug\nvar activeXDocument;\nvar NullProtoObject = function () {\n try {\n /* global ActiveXObject */\n activeXDocument = document.domain && new ActiveXObject('htmlfile');\n } catch (error) { /* ignore */ }\n NullProtoObject = activeXDocument ? NullProtoObjectViaActiveX(activeXDocument) : NullProtoObjectViaIFrame();\n var length = enumBugKeys.length;\n while (length--) delete NullProtoObject[PROTOTYPE][enumBugKeys[length]];\n return NullProtoObject();\n};\n\nhiddenKeys[IE_PROTO] = true;\n\n// `Object.create` method\n// https://tc39.github.io/ecma262/#sec-object.create\nmodule.exports = Object.create || function create(O, Properties) {\n var result;\n if (O !== null) {\n EmptyConstructor[PROTOTYPE] = anObject(O);\n result = new EmptyConstructor();\n EmptyConstructor[PROTOTYPE] = null;\n // add \"__proto__\" for Object.getPrototypeOf polyfill\n result[IE_PROTO] = O;\n } else result = NullProtoObject();\n return Properties === undefined ? result : defineProperties(result, Properties);\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar definePropertyModule = require('../internals/object-define-property');\nvar anObject = require('../internals/an-object');\nvar objectKeys = require('../internals/object-keys');\n\n// `Object.defineProperties` method\n// https://tc39.github.io/ecma262/#sec-object.defineproperties\nmodule.exports = DESCRIPTORS ? Object.defineProperties : function defineProperties(O, Properties) {\n anObject(O);\n var keys = objectKeys(Properties);\n var length = keys.length;\n var index = 0;\n var key;\n while (length > index) definePropertyModule.f(O, key = keys[index++], Properties[key]);\n return O;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar IE8_DOM_DEFINE = require('../internals/ie8-dom-define');\nvar anObject = require('../internals/an-object');\nvar toPrimitive = require('../internals/to-primitive');\n\nvar nativeDefineProperty = Object.defineProperty;\n\n// `Object.defineProperty` method\n// https://tc39.github.io/ecma262/#sec-object.defineproperty\nexports.f = DESCRIPTORS ? nativeDefineProperty : function defineProperty(O, P, Attributes) {\n anObject(O);\n P = toPrimitive(P, true);\n anObject(Attributes);\n if (IE8_DOM_DEFINE) try {\n return nativeDefineProperty(O, P, Attributes);\n } catch (error) { /* empty */ }\n if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported');\n if ('value' in Attributes) O[P] = Attributes.value;\n return O;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar toPrimitive = require('../internals/to-primitive');\nvar has = require('../internals/has');\nvar IE8_DOM_DEFINE = require('../internals/ie8-dom-define');\n\nvar nativeGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// `Object.getOwnPropertyDescriptor` method\n// https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptor\nexports.f = DESCRIPTORS ? nativeGetOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {\n O = toIndexedObject(O);\n P = toPrimitive(P, true);\n if (IE8_DOM_DEFINE) try {\n return nativeGetOwnPropertyDescriptor(O, P);\n } catch (error) { /* empty */ }\n if (has(O, P)) return createPropertyDescriptor(!propertyIsEnumerableModule.f.call(O, P), O[P]);\n};\n","var toIndexedObject = require('../internals/to-indexed-object');\nvar nativeGetOwnPropertyNames = require('../internals/object-get-own-property-names').f;\n\nvar toString = {}.toString;\n\nvar windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames\n ? Object.getOwnPropertyNames(window) : [];\n\nvar getWindowNames = function (it) {\n try {\n return nativeGetOwnPropertyNames(it);\n } catch (error) {\n return windowNames.slice();\n }\n};\n\n// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window\nmodule.exports.f = function getOwnPropertyNames(it) {\n return windowNames && toString.call(it) == '[object Window]'\n ? getWindowNames(it)\n : nativeGetOwnPropertyNames(toIndexedObject(it));\n};\n","var internalObjectKeys = require('../internals/object-keys-internal');\nvar enumBugKeys = require('../internals/enum-bug-keys');\n\nvar hiddenKeys = enumBugKeys.concat('length', 'prototype');\n\n// `Object.getOwnPropertyNames` method\n// https://tc39.github.io/ecma262/#sec-object.getownpropertynames\nexports.f = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {\n return internalObjectKeys(O, hiddenKeys);\n};\n","exports.f = Object.getOwnPropertySymbols;\n","var has = require('../internals/has');\nvar toObject = require('../internals/to-object');\nvar sharedKey = require('../internals/shared-key');\nvar CORRECT_PROTOTYPE_GETTER = require('../internals/correct-prototype-getter');\n\nvar IE_PROTO = sharedKey('IE_PROTO');\nvar ObjectPrototype = Object.prototype;\n\n// `Object.getPrototypeOf` method\n// https://tc39.github.io/ecma262/#sec-object.getprototypeof\nmodule.exports = CORRECT_PROTOTYPE_GETTER ? Object.getPrototypeOf : function (O) {\n O = toObject(O);\n if (has(O, IE_PROTO)) return O[IE_PROTO];\n if (typeof O.constructor == 'function' && O instanceof O.constructor) {\n return O.constructor.prototype;\n } return O instanceof Object ? ObjectPrototype : null;\n};\n","var has = require('../internals/has');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar indexOf = require('../internals/array-includes').indexOf;\nvar hiddenKeys = require('../internals/hidden-keys');\n\nmodule.exports = function (object, names) {\n var O = toIndexedObject(object);\n var i = 0;\n var result = [];\n var key;\n for (key in O) !has(hiddenKeys, key) && has(O, key) && result.push(key);\n // Don't enum bug & hidden keys\n while (names.length > i) if (has(O, key = names[i++])) {\n ~indexOf(result, key) || result.push(key);\n }\n return result;\n};\n","var internalObjectKeys = require('../internals/object-keys-internal');\nvar enumBugKeys = require('../internals/enum-bug-keys');\n\n// `Object.keys` method\n// https://tc39.github.io/ecma262/#sec-object.keys\nmodule.exports = Object.keys || function keys(O) {\n return internalObjectKeys(O, enumBugKeys);\n};\n","'use strict';\nvar nativePropertyIsEnumerable = {}.propertyIsEnumerable;\nvar getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// Nashorn ~ JDK8 bug\nvar NASHORN_BUG = getOwnPropertyDescriptor && !nativePropertyIsEnumerable.call({ 1: 2 }, 1);\n\n// `Object.prototype.propertyIsEnumerable` method implementation\n// https://tc39.github.io/ecma262/#sec-object.prototype.propertyisenumerable\nexports.f = NASHORN_BUG ? function propertyIsEnumerable(V) {\n var descriptor = getOwnPropertyDescriptor(this, V);\n return !!descriptor && descriptor.enumerable;\n} : nativePropertyIsEnumerable;\n","var anObject = require('../internals/an-object');\nvar aPossiblePrototype = require('../internals/a-possible-prototype');\n\n// `Object.setPrototypeOf` method\n// https://tc39.github.io/ecma262/#sec-object.setprototypeof\n// Works with __proto__ only. Old v8 can't work with null proto objects.\n/* eslint-disable no-proto */\nmodule.exports = Object.setPrototypeOf || ('__proto__' in {} ? function () {\n var CORRECT_SETTER = false;\n var test = {};\n var setter;\n try {\n setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;\n setter.call(test, []);\n CORRECT_SETTER = test instanceof Array;\n } catch (error) { /* empty */ }\n return function setPrototypeOf(O, proto) {\n anObject(O);\n aPossiblePrototype(proto);\n if (CORRECT_SETTER) setter.call(O, proto);\n else O.__proto__ = proto;\n return O;\n };\n}() : undefined);\n","'use strict';\nvar TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar classof = require('../internals/classof');\n\n// `Object.prototype.toString` method implementation\n// https://tc39.github.io/ecma262/#sec-object.prototype.tostring\nmodule.exports = TO_STRING_TAG_SUPPORT ? {}.toString : function toString() {\n return '[object ' + classof(this) + ']';\n};\n","var getBuiltIn = require('../internals/get-built-in');\nvar getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar anObject = require('../internals/an-object');\n\n// all object keys, includes non-enumerable and symbols\nmodule.exports = getBuiltIn('Reflect', 'ownKeys') || function ownKeys(it) {\n var keys = getOwnPropertyNamesModule.f(anObject(it));\n var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;\n return getOwnPropertySymbols ? keys.concat(getOwnPropertySymbols(it)) : keys;\n};\n","var global = require('../internals/global');\n\nmodule.exports = global;\n","var redefine = require('../internals/redefine');\n\nmodule.exports = function (target, src, options) {\n for (var key in src) redefine(target, key, src[key], options);\n return target;\n};\n","var global = require('../internals/global');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar has = require('../internals/has');\nvar setGlobal = require('../internals/set-global');\nvar inspectSource = require('../internals/inspect-source');\nvar InternalStateModule = require('../internals/internal-state');\n\nvar getInternalState = InternalStateModule.get;\nvar enforceInternalState = InternalStateModule.enforce;\nvar TEMPLATE = String(String).split('String');\n\n(module.exports = function (O, key, value, options) {\n var unsafe = options ? !!options.unsafe : false;\n var simple = options ? !!options.enumerable : false;\n var noTargetGet = options ? !!options.noTargetGet : false;\n if (typeof value == 'function') {\n if (typeof key == 'string' && !has(value, 'name')) createNonEnumerableProperty(value, 'name', key);\n enforceInternalState(value).source = TEMPLATE.join(typeof key == 'string' ? key : '');\n }\n if (O === global) {\n if (simple) O[key] = value;\n else setGlobal(key, value);\n return;\n } else if (!unsafe) {\n delete O[key];\n } else if (!noTargetGet && O[key]) {\n simple = true;\n }\n if (simple) O[key] = value;\n else createNonEnumerableProperty(O, key, value);\n// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative\n})(Function.prototype, 'toString', function toString() {\n return typeof this == 'function' && getInternalState(this).source || inspectSource(this);\n});\n","var classof = require('./classof-raw');\nvar regexpExec = require('./regexp-exec');\n\n// `RegExpExec` abstract operation\n// https://tc39.github.io/ecma262/#sec-regexpexec\nmodule.exports = function (R, S) {\n var exec = R.exec;\n if (typeof exec === 'function') {\n var result = exec.call(R, S);\n if (typeof result !== 'object') {\n throw TypeError('RegExp exec method returned something other than an Object or null');\n }\n return result;\n }\n\n if (classof(R) !== 'RegExp') {\n throw TypeError('RegExp#exec called on incompatible receiver');\n }\n\n return regexpExec.call(R, S);\n};\n\n","'use strict';\nvar regexpFlags = require('./regexp-flags');\nvar stickyHelpers = require('./regexp-sticky-helpers');\n\nvar nativeExec = RegExp.prototype.exec;\n// This always refers to the native implementation, because the\n// String#replace polyfill uses ./fix-regexp-well-known-symbol-logic.js,\n// which loads this file before patching the method.\nvar nativeReplace = String.prototype.replace;\n\nvar patchedExec = nativeExec;\n\nvar UPDATES_LAST_INDEX_WRONG = (function () {\n var re1 = /a/;\n var re2 = /b*/g;\n nativeExec.call(re1, 'a');\n nativeExec.call(re2, 'a');\n return re1.lastIndex !== 0 || re2.lastIndex !== 0;\n})();\n\nvar UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y || stickyHelpers.BROKEN_CARET;\n\n// nonparticipating capturing group, copied from es5-shim's String#split patch.\nvar NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;\n\nvar PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y;\n\nif (PATCH) {\n patchedExec = function exec(str) {\n var re = this;\n var lastIndex, reCopy, match, i;\n var sticky = UNSUPPORTED_Y && re.sticky;\n var flags = regexpFlags.call(re);\n var source = re.source;\n var charsAdded = 0;\n var strCopy = str;\n\n if (sticky) {\n flags = flags.replace('y', '');\n if (flags.indexOf('g') === -1) {\n flags += 'g';\n }\n\n strCopy = String(str).slice(re.lastIndex);\n // Support anchored sticky behavior.\n if (re.lastIndex > 0 && (!re.multiline || re.multiline && str[re.lastIndex - 1] !== '\\n')) {\n source = '(?: ' + source + ')';\n strCopy = ' ' + strCopy;\n charsAdded++;\n }\n // ^(? + rx + ) is needed, in combination with some str slicing, to\n // simulate the 'y' flag.\n reCopy = new RegExp('^(?:' + source + ')', flags);\n }\n\n if (NPCG_INCLUDED) {\n reCopy = new RegExp('^' + source + '$(?!\\\\s)', flags);\n }\n if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;\n\n match = nativeExec.call(sticky ? reCopy : re, strCopy);\n\n if (sticky) {\n if (match) {\n match.input = match.input.slice(charsAdded);\n match[0] = match[0].slice(charsAdded);\n match.index = re.lastIndex;\n re.lastIndex += match[0].length;\n } else re.lastIndex = 0;\n } else if (UPDATES_LAST_INDEX_WRONG && match) {\n re.lastIndex = re.global ? match.index + match[0].length : lastIndex;\n }\n if (NPCG_INCLUDED && match && match.length > 1) {\n // Fix browsers whose `exec` methods don't consistently return `undefined`\n // for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/\n nativeReplace.call(match[0], reCopy, function () {\n for (i = 1; i < arguments.length - 2; i++) {\n if (arguments[i] === undefined) match[i] = undefined;\n }\n });\n }\n\n return match;\n };\n}\n\nmodule.exports = patchedExec;\n","'use strict';\nvar anObject = require('../internals/an-object');\n\n// `RegExp.prototype.flags` getter implementation\n// https://tc39.github.io/ecma262/#sec-get-regexp.prototype.flags\nmodule.exports = function () {\n var that = anObject(this);\n var result = '';\n if (that.global) result += 'g';\n if (that.ignoreCase) result += 'i';\n if (that.multiline) result += 'm';\n if (that.dotAll) result += 's';\n if (that.unicode) result += 'u';\n if (that.sticky) result += 'y';\n return result;\n};\n","'use strict';\n\nvar fails = require('./fails');\n\n// babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError,\n// so we use an intermediate function.\nfunction RE(s, f) {\n return RegExp(s, f);\n}\n\nexports.UNSUPPORTED_Y = fails(function () {\n // babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError\n var re = RE('a', 'y');\n re.lastIndex = 2;\n return re.exec('abcd') != null;\n});\n\nexports.BROKEN_CARET = fails(function () {\n // https://bugzilla.mozilla.org/show_bug.cgi?id=773687\n var re = RE('^r', 'gy');\n re.lastIndex = 2;\n return re.exec('str') != null;\n});\n","// `RequireObjectCoercible` abstract operation\n// https://tc39.github.io/ecma262/#sec-requireobjectcoercible\nmodule.exports = function (it) {\n if (it == undefined) throw TypeError(\"Can't call method on \" + it);\n return it;\n};\n","// `SameValue` abstract operation\n// https://tc39.github.io/ecma262/#sec-samevalue\nmodule.exports = Object.is || function is(x, y) {\n // eslint-disable-next-line no-self-compare\n return x === y ? x !== 0 || 1 / x === 1 / y : x != x && y != y;\n};\n","var global = require('../internals/global');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nmodule.exports = function (key, value) {\n try {\n createNonEnumerableProperty(global, key, value);\n } catch (error) {\n global[key] = value;\n } return value;\n};\n","var defineProperty = require('../internals/object-define-property').f;\nvar has = require('../internals/has');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\n\nmodule.exports = function (it, TAG, STATIC) {\n if (it && !has(it = STATIC ? it : it.prototype, TO_STRING_TAG)) {\n defineProperty(it, TO_STRING_TAG, { configurable: true, value: TAG });\n }\n};\n","var shared = require('../internals/shared');\nvar uid = require('../internals/uid');\n\nvar keys = shared('keys');\n\nmodule.exports = function (key) {\n return keys[key] || (keys[key] = uid(key));\n};\n","var global = require('../internals/global');\nvar setGlobal = require('../internals/set-global');\n\nvar SHARED = '__core-js_shared__';\nvar store = global[SHARED] || setGlobal(SHARED, {});\n\nmodule.exports = store;\n","var IS_PURE = require('../internals/is-pure');\nvar store = require('../internals/shared-store');\n\n(module.exports = function (key, value) {\n return store[key] || (store[key] = value !== undefined ? value : {});\n})('versions', []).push({\n version: '3.6.5',\n mode: IS_PURE ? 'pure' : 'global',\n copyright: '© 2020 Denis Pushkarev (zloirock.ru)'\n});\n","var anObject = require('../internals/an-object');\nvar aFunction = require('../internals/a-function');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar SPECIES = wellKnownSymbol('species');\n\n// `SpeciesConstructor` abstract operation\n// https://tc39.github.io/ecma262/#sec-speciesconstructor\nmodule.exports = function (O, defaultConstructor) {\n var C = anObject(O).constructor;\n var S;\n return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aFunction(S);\n};\n","var toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\n\n// `String.prototype.{ codePointAt, at }` methods implementation\nvar createMethod = function (CONVERT_TO_STRING) {\n return function ($this, pos) {\n var S = String(requireObjectCoercible($this));\n var position = toInteger(pos);\n var size = S.length;\n var first, second;\n if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;\n first = S.charCodeAt(position);\n return first < 0xD800 || first > 0xDBFF || position + 1 === size\n || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF\n ? CONVERT_TO_STRING ? S.charAt(position) : first\n : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;\n };\n};\n\nmodule.exports = {\n // `String.prototype.codePointAt` method\n // https://tc39.github.io/ecma262/#sec-string.prototype.codepointat\n codeAt: createMethod(false),\n // `String.prototype.at` method\n // https://github.com/mathiasbynens/String.prototype.at\n charAt: createMethod(true)\n};\n","'use strict';\n// based on https://github.com/bestiejs/punycode.js/blob/master/punycode.js\nvar maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1\nvar base = 36;\nvar tMin = 1;\nvar tMax = 26;\nvar skew = 38;\nvar damp = 700;\nvar initialBias = 72;\nvar initialN = 128; // 0x80\nvar delimiter = '-'; // '\\x2D'\nvar regexNonASCII = /[^\\0-\\u007E]/; // non-ASCII chars\nvar regexSeparators = /[.\\u3002\\uFF0E\\uFF61]/g; // RFC 3490 separators\nvar OVERFLOW_ERROR = 'Overflow: input needs wider integers to process';\nvar baseMinusTMin = base - tMin;\nvar floor = Math.floor;\nvar stringFromCharCode = String.fromCharCode;\n\n/**\n * Creates an array containing the numeric code points of each Unicode\n * character in the string. While JavaScript uses UCS-2 internally,\n * this function will convert a pair of surrogate halves (each of which\n * UCS-2 exposes as separate characters) into a single code point,\n * matching UTF-16.\n */\nvar ucs2decode = function (string) {\n var output = [];\n var counter = 0;\n var length = string.length;\n while (counter < length) {\n var value = string.charCodeAt(counter++);\n if (value >= 0xD800 && value <= 0xDBFF && counter < length) {\n // It's a high surrogate, and there is a next character.\n var extra = string.charCodeAt(counter++);\n if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.\n output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);\n } else {\n // It's an unmatched surrogate; only append this code unit, in case the\n // next code unit is the high surrogate of a surrogate pair.\n output.push(value);\n counter--;\n }\n } else {\n output.push(value);\n }\n }\n return output;\n};\n\n/**\n * Converts a digit/integer into a basic code point.\n */\nvar digitToBasic = function (digit) {\n // 0..25 map to ASCII a..z or A..Z\n // 26..35 map to ASCII 0..9\n return digit + 22 + 75 * (digit < 26);\n};\n\n/**\n * Bias adaptation function as per section 3.4 of RFC 3492.\n * https://tools.ietf.org/html/rfc3492#section-3.4\n */\nvar adapt = function (delta, numPoints, firstTime) {\n var k = 0;\n delta = firstTime ? floor(delta / damp) : delta >> 1;\n delta += floor(delta / numPoints);\n for (; delta > baseMinusTMin * tMax >> 1; k += base) {\n delta = floor(delta / baseMinusTMin);\n }\n return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));\n};\n\n/**\n * Converts a string of Unicode symbols (e.g. a domain name label) to a\n * Punycode string of ASCII-only symbols.\n */\n// eslint-disable-next-line max-statements\nvar encode = function (input) {\n var output = [];\n\n // Convert the input in UCS-2 to an array of Unicode code points.\n input = ucs2decode(input);\n\n // Cache the length.\n var inputLength = input.length;\n\n // Initialize the state.\n var n = initialN;\n var delta = 0;\n var bias = initialBias;\n var i, currentValue;\n\n // Handle the basic code points.\n for (i = 0; i < input.length; i++) {\n currentValue = input[i];\n if (currentValue < 0x80) {\n output.push(stringFromCharCode(currentValue));\n }\n }\n\n var basicLength = output.length; // number of basic code points.\n var handledCPCount = basicLength; // number of code points that have been handled;\n\n // Finish the basic string with a delimiter unless it's empty.\n if (basicLength) {\n output.push(delimiter);\n }\n\n // Main encoding loop:\n while (handledCPCount < inputLength) {\n // All non-basic code points < n have been handled already. Find the next larger one:\n var m = maxInt;\n for (i = 0; i < input.length; i++) {\n currentValue = input[i];\n if (currentValue >= n && currentValue < m) {\n m = currentValue;\n }\n }\n\n // Increase `delta` enough to advance the decoder's ${html}\n