{"version":3,"file":"contents.mjs","sources":["../../../../../node_modules/epubjs/src/contents.js"],"sourcesContent":["import EventEmitter from \"event-emitter\";\nimport {isNumber, prefixed, borders, defaults} from \"./utils/core\";\nimport EpubCFI from \"./epubcfi\";\nimport Mapping from \"./mapping\";\nimport {replaceLinks} from \"./utils/replacements\";\nimport { EPUBJS_VERSION, EVENTS, DOM_EVENTS } from \"./utils/constants\";\n\nconst hasNavigator = typeof (navigator) !== \"undefined\";\n\nconst isChrome = hasNavigator && /Chrome/.test(navigator.userAgent);\nconst isWebkit = hasNavigator && !isChrome && /AppleWebKit/.test(navigator.userAgent);\n\nconst ELEMENT_NODE = 1;\nconst TEXT_NODE = 3;\n\n/**\n\t* Handles DOM manipulation, queries and events for View contents\n\t* @class\n\t* @param {document} doc Document\n\t* @param {element} content Parent Element (typically Body)\n\t* @param {string} cfiBase Section component of CFIs\n\t* @param {number} sectionIndex Index in Spine of Conntent's Section\n\t*/\nclass Contents {\n\tconstructor(doc, content, cfiBase, sectionIndex) {\n\t\t// Blank Cfi for Parsing\n\t\tthis.epubcfi = new EpubCFI();\n\n\t\tthis.document = doc;\n\t\tthis.documentElement =  this.document.documentElement;\n\t\tthis.content = content || this.document.body;\n\t\tthis.window = this.document.defaultView;\n\n\t\tthis._size = {\n\t\t\twidth: 0,\n\t\t\theight: 0\n\t\t};\n\n\t\tthis.sectionIndex = sectionIndex || 0;\n\t\tthis.cfiBase = cfiBase || \"\";\n\n\t\tthis.epubReadingSystem(\"epub.js\", EPUBJS_VERSION);\n\t\tthis.called = 0;\n\t\tthis.active = true;\n\t\tthis.listeners();\n\t}\n\n\t/**\n\t\t* Get DOM events that are listened for and passed along\n\t\t*/\n\tstatic get listenedEvents() {\n\t\treturn DOM_EVENTS;\n\t}\n\n\t/**\n\t\t* Get or Set width\n\t\t* @param {number} [w]\n\t\t* @returns {number} width\n\t\t*/\n\twidth(w) {\n\t\t// var frame = this.documentElement;\n\t\tvar frame = this.content;\n\n\t\tif (w && isNumber(w)) {\n\t\t\tw = w + \"px\";\n\t\t}\n\n\t\tif (w) {\n\t\t\tframe.style.width = w;\n\t\t\t// this.content.style.width = w;\n\t\t}\n\n\t\treturn parseInt(this.window.getComputedStyle(frame)[\"width\"]);\n\n\n\t}\n\n\t/**\n\t\t* Get or Set height\n\t\t* @param {number} [h]\n\t\t* @returns {number} height\n\t\t*/\n\theight(h) {\n\t\t// var frame = this.documentElement;\n\t\tvar frame = this.content;\n\n\t\tif (h && isNumber(h)) {\n\t\t\th = h + \"px\";\n\t\t}\n\n\t\tif (h) {\n\t\t\tframe.style.height = h;\n\t\t\t// this.content.style.height = h;\n\t\t}\n\n\t\treturn parseInt(this.window.getComputedStyle(frame)[\"height\"]);\n\n\t}\n\n\t/**\n\t\t* Get or Set width of the contents\n\t\t* @param {number} [w]\n\t\t* @returns {number} width\n\t\t*/\n\tcontentWidth(w) {\n\n\t\tvar content = this.content || this.document.body;\n\n\t\tif (w && isNumber(w)) {\n\t\t\tw = w + \"px\";\n\t\t}\n\n\t\tif (w) {\n\t\t\tcontent.style.width = w;\n\t\t}\n\n\t\treturn parseInt(this.window.getComputedStyle(content)[\"width\"]);\n\n\n\t}\n\n\t/**\n\t\t* Get or Set height of the contents\n\t\t* @param {number} [h]\n\t\t* @returns {number} height\n\t\t*/\n\tcontentHeight(h) {\n\n\t\tvar content = this.content || this.document.body;\n\n\t\tif (h && isNumber(h)) {\n\t\t\th = h + \"px\";\n\t\t}\n\n\t\tif (h) {\n\t\t\tcontent.style.height = h;\n\t\t}\n\n\t\treturn parseInt(this.window.getComputedStyle(content)[\"height\"]);\n\n\t}\n\n\t/**\n\t\t* Get the width of the text using Range\n\t\t* @returns {number} width\n\t\t*/\n\ttextWidth() {\n\t\tlet rect;\n\t\tlet width;\n\t\tlet range = this.document.createRange();\n\t\tlet content = this.content || this.document.body;\n\t\tlet border = borders(content);\n\n\t\t// Select the contents of frame\n\t\trange.selectNodeContents(content);\n\n\t\t// get the width of the text content\n\t\trect = range.getBoundingClientRect();\n\t\twidth = rect.width;\n\n\t\tif (border && border.width) {\n\t\t\twidth += border.width;\n\t\t}\n\n\t\treturn Math.round(width);\n\t}\n\n\t/**\n\t\t* Get the height of the text using Range\n\t\t* @returns {number} height\n\t\t*/\n\ttextHeight() {\n\t\tlet rect;\n\t\tlet height;\n\t\tlet range = this.document.createRange();\n\t\tlet content = this.content || this.document.body;\n\n\t\trange.selectNodeContents(content);\n\n\t\trect = range.getBoundingClientRect();\n\t\theight = rect.bottom;\n\n\t\treturn Math.round(height);\n\t}\n\n\t/**\n\t\t* Get documentElement scrollWidth\n\t\t* @returns {number} width\n\t\t*/\n\tscrollWidth() {\n\t\tvar width = this.documentElement.scrollWidth;\n\n\t\treturn width;\n\t}\n\n\t/**\n\t\t* Get documentElement scrollHeight\n\t\t* @returns {number} height\n\t\t*/\n\tscrollHeight() {\n\t\tvar height = this.documentElement.scrollHeight;\n\n\t\treturn height;\n\t}\n\n\t/**\n\t\t* Set overflow css style of the contents\n\t\t* @param {string} [overflow]\n\t\t*/\n\toverflow(overflow) {\n\n\t\tif (overflow) {\n\t\t\tthis.documentElement.style.overflow = overflow;\n\t\t}\n\n\t\treturn this.window.getComputedStyle(this.documentElement)[\"overflow\"];\n\t}\n\n\t/**\n\t\t* Set overflowX css style of the documentElement\n\t\t* @param {string} [overflow]\n\t\t*/\n\toverflowX(overflow) {\n\n\t\tif (overflow) {\n\t\t\tthis.documentElement.style.overflowX = overflow;\n\t\t}\n\n\t\treturn this.window.getComputedStyle(this.documentElement)[\"overflowX\"];\n\t}\n\n\t/**\n\t\t* Set overflowY css style of the documentElement\n\t\t* @param {string} [overflow]\n\t\t*/\n\toverflowY(overflow) {\n\n\t\tif (overflow) {\n\t\t\tthis.documentElement.style.overflowY = overflow;\n\t\t}\n\n\t\treturn this.window.getComputedStyle(this.documentElement)[\"overflowY\"];\n\t}\n\n\t/**\n\t\t* Set Css styles on the contents element (typically Body)\n\t\t* @param {string} property\n\t\t* @param {string} value\n\t\t* @param {boolean} [priority] set as \"important\"\n\t\t*/\n\tcss(property, value, priority) {\n\t\tvar content = this.content || this.document.body;\n\n\t\tif (value) {\n\t\t\tcontent.style.setProperty(property, value, priority ? \"important\" : \"\");\n\t\t} else {\n\t\t\tcontent.style.removeProperty(property);\n\t\t}\n\n\t\treturn this.window.getComputedStyle(content)[property];\n\t}\n\n\t/**\n\t\t* Get or Set the viewport element\n\t\t* @param {object} [options]\n\t\t* @param {string} [options.width]\n\t\t* @param {string} [options.height]\n\t\t* @param {string} [options.scale]\n\t\t* @param {string} [options.minimum]\n\t\t* @param {string} [options.maximum]\n\t\t* @param {string} [options.scalable]\n\t\t*/\n\tviewport(options) {\n\t\tvar _width, _height, _scale, _minimum, _maximum, _scalable;\n\t\t// var width, height, scale, minimum, maximum, scalable;\n\t\tvar $viewport = this.document.querySelector(\"meta[name='viewport']\");\n\t\tvar parsed = {\n\t\t\t\"width\": undefined,\n\t\t\t\"height\": undefined,\n\t\t\t\"scale\": undefined,\n\t\t\t\"minimum\": undefined,\n\t\t\t\"maximum\": undefined,\n\t\t\t\"scalable\": undefined\n\t\t};\n\t\tvar newContent = [];\n\t\tvar settings = {};\n\n\t\t/*\n\t\t* check for the viewport size\n\t\t* <meta name=\"viewport\" content=\"width=1024,height=697\" />\n\t\t*/\n\t\tif($viewport && $viewport.hasAttribute(\"content\")) {\n\t\t\tlet content = $viewport.getAttribute(\"content\");\n\t\t\tlet _width = content.match(/width\\s*=\\s*([^,]*)/);\n\t\t\tlet _height = content.match(/height\\s*=\\s*([^,]*)/);\n\t\t\tlet _scale = content.match(/initial-scale\\s*=\\s*([^,]*)/);\n\t\t\tlet _minimum = content.match(/minimum-scale\\s*=\\s*([^,]*)/);\n\t\t\tlet _maximum = content.match(/maximum-scale\\s*=\\s*([^,]*)/);\n\t\t\tlet _scalable = content.match(/user-scalable\\s*=\\s*([^,]*)/);\n\n\t\t\tif(_width && _width.length && typeof _width[1] !== \"undefined\"){\n\t\t\t\tparsed.width = _width[1];\n\t\t\t}\n\t\t\tif(_height && _height.length && typeof _height[1] !== \"undefined\"){\n\t\t\t\tparsed.height = _height[1];\n\t\t\t}\n\t\t\tif(_scale && _scale.length && typeof _scale[1] !== \"undefined\"){\n\t\t\t\tparsed.scale = _scale[1];\n\t\t\t}\n\t\t\tif(_minimum && _minimum.length && typeof _minimum[1] !== \"undefined\"){\n\t\t\t\tparsed.minimum = _minimum[1];\n\t\t\t}\n\t\t\tif(_maximum && _maximum.length && typeof _maximum[1] !== \"undefined\"){\n\t\t\t\tparsed.maximum = _maximum[1];\n\t\t\t}\n\t\t\tif(_scalable && _scalable.length && typeof _scalable[1] !== \"undefined\"){\n\t\t\t\tparsed.scalable = _scalable[1];\n\t\t\t}\n\t\t}\n\n\t\tsettings = defaults(options || {}, parsed);\n\n\t\tif (options) {\n\t\t\tif (settings.width) {\n\t\t\t\tnewContent.push(\"width=\" + settings.width);\n\t\t\t}\n\n\t\t\tif (settings.height) {\n\t\t\t\tnewContent.push(\"height=\" + settings.height);\n\t\t\t}\n\n\t\t\tif (settings.scale) {\n\t\t\t\tnewContent.push(\"initial-scale=\" + settings.scale);\n\t\t\t}\n\n\t\t\tif (settings.scalable === \"no\") {\n\t\t\t\tnewContent.push(\"minimum-scale=\" + settings.scale);\n\t\t\t\tnewContent.push(\"maximum-scale=\" + settings.scale);\n\t\t\t\tnewContent.push(\"user-scalable=\" + settings.scalable);\n\t\t\t} else {\n\n\t\t\t\tif (settings.scalable) {\n\t\t\t\t\tnewContent.push(\"user-scalable=\" + settings.scalable);\n\t\t\t\t}\n\n\t\t\t\tif (settings.minimum) {\n\t\t\t\t\tnewContent.push(\"minimum-scale=\" + settings.minimum);\n\t\t\t\t}\n\n\t\t\t\tif (settings.maximum) {\n\t\t\t\t\tnewContent.push(\"minimum-scale=\" + settings.maximum);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (!$viewport) {\n\t\t\t\t$viewport = this.document.createElement(\"meta\");\n\t\t\t\t$viewport.setAttribute(\"name\", \"viewport\");\n\t\t\t\tthis.document.querySelector(\"head\").appendChild($viewport);\n\t\t\t}\n\n\t\t\t$viewport.setAttribute(\"content\", newContent.join(\", \"));\n\n\t\t\tthis.window.scrollTo(0, 0);\n\t\t}\n\n\n\t\treturn settings;\n\t}\n\n\t/**\n\t * Event emitter for when the contents has expanded\n\t * @private\n\t */\n\texpand() {\n\t\tthis.emit(EVENTS.CONTENTS.EXPAND);\n\t}\n\n\t/**\n\t * Add DOM listeners\n\t * @private\n\t */\n\tlisteners() {\n\t\tthis.imageLoadListeners();\n\n\t\tthis.mediaQueryListeners();\n\n\t\t// this.fontLoadListeners();\n\n\t\tthis.addEventListeners();\n\n\t\tthis.addSelectionListeners();\n\n\t\t// this.transitionListeners();\n\n\t\tif (typeof ResizeObserver === \"undefined\") {\n\t\t\tthis.resizeListeners();\n\t\t\tthis.visibilityListeners();\n\t\t} else {\n\t\t\tthis.resizeObservers();\n\t\t}\n\n\t\t// this.mutationObservers();\n\n\t\tthis.linksHandler();\n\t}\n\n\t/**\n\t * Remove DOM listeners\n\t * @private\n\t */\n\tremoveListeners() {\n\n\t\tthis.removeEventListeners();\n\n\t\tthis.removeSelectionListeners();\n\n\t\tif (this.observer) {\n\t\t\tthis.observer.disconnect();\n\t\t}\n\n\t\tclearTimeout(this.expanding);\n\t}\n\n\t/**\n\t * Check if size of contents has changed and\n\t * emit 'resize' event if it has.\n\t * @private\n\t */\n\tresizeCheck() {\n\t\tlet width = this.textWidth();\n\t\tlet height = this.textHeight();\n\n\t\tif (width != this._size.width || height != this._size.height) {\n\n\t\t\tthis._size = {\n\t\t\t\twidth: width,\n\t\t\t\theight: height\n\t\t\t};\n\n\t\t\tthis.onResize && this.onResize(this._size);\n\t\t\tthis.emit(EVENTS.CONTENTS.RESIZE, this._size);\n\t\t}\n\t}\n\n\t/**\n\t * Poll for resize detection\n\t * @private\n\t */\n\tresizeListeners() {\n\t\tvar width, height;\n\t\t// Test size again\n\t\tclearTimeout(this.expanding);\n\t\trequestAnimationFrame(this.resizeCheck.bind(this));\n\t\tthis.expanding = setTimeout(this.resizeListeners.bind(this), 350);\n\t}\n\n\t/**\n\t * Listen for visibility of tab to change\n\t * @private\n\t */\n\tvisibilityListeners() {\n\t\tdocument.addEventListener(\"visibilitychange\", () => {\n\t\t\tif (document.visibilityState === \"visible\" && this.active === false) {\n\t\t\t\tthis.active = true;\n\t\t\t\tthis.resizeListeners();\n\t\t\t} else {\n\t\t\t\tthis.active = false;\n\t\t\t\tclearTimeout(this.expanding);\n\t\t\t}\n\t\t});\n\t}\n\n\t/**\n\t * Use css transitions to detect resize\n\t * @private\n\t */\n\ttransitionListeners() {\n\t\tlet body = this.content;\n\n\t\tbody.style['transitionProperty'] = \"font, font-size, font-size-adjust, font-stretch, font-variation-settings, font-weight, width, height\";\n\t\tbody.style['transitionDuration'] = \"0.001ms\";\n\t\tbody.style['transitionTimingFunction'] = \"linear\";\n\t\tbody.style['transitionDelay'] = \"0\";\n\n\t\tthis._resizeCheck = this.resizeCheck.bind(this);\n\t\tthis.document.addEventListener('transitionend', this._resizeCheck);\n\t}\n\n\t/**\n\t * Listen for media query changes and emit 'expand' event\n\t * Adapted from: https://github.com/tylergaw/media-query-events/blob/master/js/mq-events.js\n\t * @private\n\t */\n\tmediaQueryListeners() {\n\t\tvar sheets = this.document.styleSheets;\n\t\tvar mediaChangeHandler = function(m){\n\t\t\tif(m.matches && !this._expanding) {\n\t\t\t\tsetTimeout(this.expand.bind(this), 1);\n\t\t\t}\n\t\t}.bind(this);\n\n\t\tfor (var i = 0; i < sheets.length; i += 1) {\n\t\t\tvar rules;\n\t\t\t// Firefox errors if we access cssRules cross-domain\n\t\t\ttry {\n\t\t\t\trules = sheets[i].cssRules;\n\t\t\t} catch (e) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tif(!rules) return; // Stylesheets changed\n\t\t\tfor (var j = 0; j < rules.length; j += 1) {\n\t\t\t\t//if (rules[j].constructor === CSSMediaRule) {\n\t\t\t\tif(rules[j].media){\n\t\t\t\t\tvar mql = this.window.matchMedia(rules[j].media.mediaText);\n\t\t\t\t\tmql.addListener(mediaChangeHandler);\n\t\t\t\t\t//mql.onchange = mediaChangeHandler;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Use ResizeObserver to listen for changes in the DOM and check for resize\n\t * @private\n\t */\n\tresizeObservers() {\n\t\t// create an observer instance\n\t\tthis.observer = new ResizeObserver((e) => {\n\t\t\trequestAnimationFrame(this.resizeCheck.bind(this));\n\t\t});\n\n\t\t// pass in the target node\n\t\tthis.observer.observe(this.document.documentElement);\n\t}\n\n\t/**\n\t * Use MutationObserver to listen for changes in the DOM and check for resize\n\t * @private\n\t */\n\tmutationObservers() {\n\t\t// create an observer instance\n\t\tthis.observer = new MutationObserver((mutations) => {\n\t\t\tthis.resizeCheck();\n\t\t});\n\n\t\t// configuration of the observer:\n\t\tlet config = { attributes: true, childList: true, characterData: true, subtree: true };\n\n\t\t// pass in the target node, as well as the observer options\n\t\tthis.observer.observe(this.document, config);\n\t}\n\n\t/**\n\t * Test if images are loaded or add listener for when they load\n\t * @private\n\t */\n\timageLoadListeners() {\n\t\tvar images = this.document.querySelectorAll(\"img\");\n\t\tvar img;\n\t\tfor (var i = 0; i < images.length; i++) {\n\t\t\timg = images[i];\n\n\t\t\tif (typeof img.naturalWidth !== \"undefined\" &&\n\t\t\t\t\timg.naturalWidth === 0) {\n\t\t\t\timg.onload = this.expand.bind(this);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Listen for font load and check for resize when loaded\n\t * @private\n\t */\n\tfontLoadListeners() {\n\t\tif (!this.document || !this.document.fonts) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.document.fonts.ready.then(function () {\n\t\t\tthis.resizeCheck();\n\t\t}.bind(this));\n\n\t}\n\n\t/**\n\t * Get the documentElement\n\t * @returns {element} documentElement\n\t */\n\troot() {\n\t\tif(!this.document) return null;\n\t\treturn this.document.documentElement;\n\t}\n\n\t/**\n\t * Get the location offset of a EpubCFI or an #id\n\t * @param {string | EpubCFI} target\n\t * @param {string} [ignoreClass] for the cfi\n\t * @returns { {left: Number, top: Number }\n\t */\n\tlocationOf(target, ignoreClass) {\n\t\tvar position;\n\t\tvar targetPos = {\"left\": 0, \"top\": 0};\n\n\t\tif(!this.document) return targetPos;\n\n\t\tif(this.epubcfi.isCfiString(target)) {\n\t\t\tlet range = new EpubCFI(target).toRange(this.document, ignoreClass);\n\n\t\t\tif(range) {\n\t\t\t\ttry {\n\t\t\t\t\tif (!range.endContainer ||\n\t\t\t\t\t\t(range.startContainer == range.endContainer\n\t\t\t\t\t\t&& range.startOffset == range.endOffset)) {\n\t\t\t\t\t\t// If the end for the range is not set, it results in collapsed becoming\n\t\t\t\t\t\t// true. This in turn leads to inconsistent behaviour when calling\n\t\t\t\t\t\t// getBoundingRect. Wrong bounds lead to the wrong page being displayed.\n\t\t\t\t\t\t// https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/15684911/\n\t\t\t\t\t\tlet pos = range.startContainer.textContent.indexOf(\" \", range.startOffset);\n\t\t\t\t\t\tif (pos == -1) {\n\t\t\t\t\t\t\tpos = range.startContainer.textContent.length;\n\t\t\t\t\t\t}\n\t\t\t\t\t\trange.setEnd(range.startContainer, pos);\n\t\t\t\t\t}\n\t\t\t\t} catch (e) {\n\t\t\t\t\tconsole.error(\"setting end offset to start container length failed\", e);\n\t\t\t\t}\n\n\t\t\t\tif (range.startContainer.nodeType === Node.ELEMENT_NODE) {\n\t\t\t\t\tposition = range.startContainer.getBoundingClientRect();\n\t\t\t\t\ttargetPos.left = position.left;\n\t\t\t\t\ttargetPos.top = position.top;\n\t\t\t\t} else {\n\t\t\t\t\t// Webkit does not handle collapsed range bounds correctly\n\t\t\t\t\t// https://bugs.webkit.org/show_bug.cgi?id=138949\n\n\t\t\t\t\t// Construct a new non-collapsed range\n\t\t\t\t\tif (isWebkit) {\n\t\t\t\t\t\tlet container = range.startContainer;\n\t\t\t\t\t\tlet newRange = new Range();\n\t\t\t\t\t\ttry {\n\t\t\t\t\t\t\tif (container.nodeType === ELEMENT_NODE) {\n\t\t\t\t\t\t\t\tposition = container.getBoundingClientRect();\n\t\t\t\t\t\t\t} else if (range.startOffset + 2 < container.length) {\n\t\t\t\t\t\t\t\tnewRange.setStart(container, range.startOffset);\n\t\t\t\t\t\t\t\tnewRange.setEnd(container, range.startOffset + 2);\n\t\t\t\t\t\t\t\tposition = newRange.getBoundingClientRect();\n\t\t\t\t\t\t\t} else if (range.startOffset - 2 > 0) {\n\t\t\t\t\t\t\t\tnewRange.setStart(container, range.startOffset - 2);\n\t\t\t\t\t\t\t\tnewRange.setEnd(container, range.startOffset);\n\t\t\t\t\t\t\t\tposition = newRange.getBoundingClientRect();\n\t\t\t\t\t\t\t} else { // empty, return the parent element\n\t\t\t\t\t\t\t\tposition = container.parentNode.getBoundingClientRect();\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t} catch (e) {\n\t\t\t\t\t\t\tconsole.error(e, e.stack);\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tposition = range.getBoundingClientRect();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t} else if(typeof target === \"string\" &&\n\t\t\ttarget.indexOf(\"#\") > -1) {\n\n\t\t\tlet id = target.substring(target.indexOf(\"#\")+1);\n\t\t\tlet el = this.document.getElementById(id);\n\t\t\tif(el) {\n\t\t\t\tif (isWebkit) {\n\t\t\t\t\t// Webkit reports incorrect bounding rects in Columns\n\t\t\t\t\tlet newRange = new Range();\n\t\t\t\t\tnewRange.selectNode(el);\n\t\t\t\t\tposition = newRange.getBoundingClientRect();\n\t\t\t\t} else {\n\t\t\t\t\tposition = el.getBoundingClientRect();\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif (position) {\n\t\t\ttargetPos.left = position.left;\n\t\t\ttargetPos.top = position.top;\n\t\t}\n\n\t\treturn targetPos;\n\t}\n\n\t/**\n\t * Append a stylesheet link to the document head\n\t * @param {string} src url\n\t */\n\taddStylesheet(src) {\n\t\treturn new Promise(function(resolve, reject){\n\t\t\tvar $stylesheet;\n\t\t\tvar ready = false;\n\n\t\t\tif(!this.document) {\n\t\t\t\tresolve(false);\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Check if link already exists\n\t\t\t$stylesheet = this.document.querySelector(\"link[href='\"+src+\"']\");\n\t\t\tif ($stylesheet) {\n\t\t\t\tresolve(true);\n\t\t\t\treturn; // already present\n\t\t\t}\n\n\t\t\t$stylesheet = this.document.createElement(\"link\");\n\t\t\t$stylesheet.type = \"text/css\";\n\t\t\t$stylesheet.rel = \"stylesheet\";\n\t\t\t$stylesheet.href = src;\n\t\t\t$stylesheet.onload = $stylesheet.onreadystatechange = function() {\n\t\t\t\tif ( !ready && (!this.readyState || this.readyState == \"complete\") ) {\n\t\t\t\t\tready = true;\n\t\t\t\t\t// Let apply\n\t\t\t\t\tsetTimeout(() => {\n\t\t\t\t\t\tresolve(true);\n\t\t\t\t\t}, 1);\n\t\t\t\t}\n\t\t\t};\n\n\t\t\tthis.document.head.appendChild($stylesheet);\n\n\t\t}.bind(this));\n\t}\n\n\t_getStylesheetNode(key) {\n\t\tvar styleEl;\n\t\tkey = \"epubjs-inserted-css-\" + (key || '');\n\n\t\tif(!this.document) return false;\n\n\t\t// Check if link already exists\n\t\tstyleEl = this.document.getElementById(key);\n\t\tif (!styleEl) {\n\t\t\tstyleEl = this.document.createElement(\"style\");\n\t\t\tstyleEl.id = key;\n\t\t\t// Append style element to head\n\t\t\tthis.document.head.appendChild(styleEl);\n\t\t}\n\t\treturn styleEl;\n\t}\n\n\t/**\n\t * Append stylesheet css\n\t * @param {string} serializedCss\n\t * @param {string} key If the key is the same, the CSS will be replaced instead of inserted\n\t */\n\taddStylesheetCss(serializedCss, key) {\n\t\tif(!this.document || !serializedCss) return false;\n\n\t\tvar styleEl;\n\t\tstyleEl = this._getStylesheetNode(key);\n\t\tstyleEl.innerHTML = serializedCss;\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Append stylesheet rules to a generate stylesheet\n\t * Array: https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/insertRule\n\t * Object: https://github.com/desirable-objects/json-to-css\n\t * @param {array | object} rules\n\t * @param {string} key If the key is the same, the CSS will be replaced instead of inserted\n\t */\n\taddStylesheetRules(rules, key) {\n\t\tvar styleSheet;\n\n\t\tif(!this.document || !rules || rules.length === 0) return;\n\n\t\t// Grab style sheet\n\t\tstyleSheet = this._getStylesheetNode(key).sheet;\n\n\t\tif (Object.prototype.toString.call(rules) === \"[object Array]\") {\n\t\t\tfor (var i = 0, rl = rules.length; i < rl; i++) {\n\t\t\t\tvar j = 1, rule = rules[i], selector = rules[i][0], propStr = \"\";\n\t\t\t\t// If the second argument of a rule is an array of arrays, correct our variables.\n\t\t\t\tif (Object.prototype.toString.call(rule[1][0]) === \"[object Array]\") {\n\t\t\t\t\trule = rule[1];\n\t\t\t\t\tj = 0;\n\t\t\t\t}\n\n\t\t\t\tfor (var pl = rule.length; j < pl; j++) {\n\t\t\t\t\tvar prop = rule[j];\n\t\t\t\t\tpropStr += prop[0] + \":\" + prop[1] + (prop[2] ? \" !important\" : \"\") + \";\\n\";\n\t\t\t\t}\n\n\t\t\t\t// Insert CSS Rule\n\t\t\t\tstyleSheet.insertRule(selector + \"{\" + propStr + \"}\", styleSheet.cssRules.length);\n\t\t\t}\n\t\t} else {\n\t\t\tconst selectors = Object.keys(rules);\n\t\t\tselectors.forEach((selector) => {\n\t\t\t\tconst definition = rules[selector];\n\t\t\t\tif (Array.isArray(definition)) {\n\t\t\t\t\tdefinition.forEach((item) => {\n\t\t\t\t\t\tconst _rules = Object.keys(item);\n\t\t\t\t\t\tconst result = _rules.map((rule) => {\n\t\t\t\t\t\t\treturn `${rule}:${item[rule]}`;\n\t\t\t\t\t\t}).join(';');\n\t\t\t\t\t\tstyleSheet.insertRule(`${selector}{${result}}`, styleSheet.cssRules.length);\n\t\t\t\t\t});\n\t\t\t\t} else {\n\t\t\t\t\tconst _rules = Object.keys(definition);\n\t\t\t\t\tconst result = _rules.map((rule) => {\n\t\t\t\t\t\treturn `${rule}:${definition[rule]}`;\n\t\t\t\t\t}).join(';');\n\t\t\t\t\tstyleSheet.insertRule(`${selector}{${result}}`, styleSheet.cssRules.length);\n\t\t\t\t}\n\t\t\t});\n\t\t}\n\t}\n\n\t/**\n\t * Append a script tag to the document head\n\t * @param {string} src url\n\t * @returns {Promise} loaded\n\t */\n\taddScript(src) {\n\n\t\treturn new Promise(function(resolve, reject){\n\t\t\tvar $script;\n\t\t\tvar ready = false;\n\n\t\t\tif(!this.document) {\n\t\t\t\tresolve(false);\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t$script = this.document.createElement(\"script\");\n\t\t\t$script.type = \"text/javascript\";\n\t\t\t$script.async = true;\n\t\t\t$script.src = src;\n\t\t\t$script.onload = $script.onreadystatechange = function() {\n\t\t\t\tif ( !ready && (!this.readyState || this.readyState == \"complete\") ) {\n\t\t\t\t\tready = true;\n\t\t\t\t\tsetTimeout(function(){\n\t\t\t\t\t\tresolve(true);\n\t\t\t\t\t}, 1);\n\t\t\t\t}\n\t\t\t};\n\n\t\t\tthis.document.head.appendChild($script);\n\n\t\t}.bind(this));\n\t}\n\n\t/**\n\t * Add a class to the contents container\n\t * @param {string} className\n\t */\n\taddClass(className) {\n\t\tvar content;\n\n\t\tif(!this.document) return;\n\n\t\tcontent = this.content || this.document.body;\n\n\t\tif (content) {\n\t\t\tcontent.classList.add(className);\n\t\t}\n\n\t}\n\n\t/**\n\t * Remove a class from the contents container\n\t * @param {string} removeClass\n\t */\n\tremoveClass(className) {\n\t\tvar content;\n\n\t\tif(!this.document) return;\n\n\t\tcontent = this.content || this.document.body;\n\n\t\tif (content) {\n\t\t\tcontent.classList.remove(className);\n\t\t}\n\n\t}\n\n\t/**\n\t * Add DOM event listeners\n\t * @private\n\t */\n\taddEventListeners(){\n\t\tif(!this.document) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._triggerEvent = this.triggerEvent.bind(this);\n\n\t\tDOM_EVENTS.forEach(function(eventName){\n\t\t\tthis.document.addEventListener(eventName, this._triggerEvent, { passive: true });\n\t\t}, this);\n\n\t}\n\n\t/**\n\t * Remove DOM event listeners\n\t * @private\n\t */\n\tremoveEventListeners(){\n\t\tif(!this.document) {\n\t\t\treturn;\n\t\t}\n\t\tDOM_EVENTS.forEach(function(eventName){\n\t\t\tthis.document.removeEventListener(eventName, this._triggerEvent, { passive: true });\n\t\t}, this);\n\t\tthis._triggerEvent = undefined;\n\t}\n\n\t/**\n\t * Emit passed browser events\n\t * @private\n\t */\n\ttriggerEvent(e){\n\t\tthis.emit(e.type, e);\n\t}\n\n\t/**\n\t * Add listener for text selection\n\t * @private\n\t */\n\taddSelectionListeners(){\n\t\tif(!this.document) {\n\t\t\treturn;\n\t\t}\n\t\tthis._onSelectionChange = this.onSelectionChange.bind(this);\n\t\tthis.document.addEventListener(\"selectionchange\", this._onSelectionChange, { passive: true });\n\t}\n\n\t/**\n\t * Remove listener for text selection\n\t * @private\n\t */\n\tremoveSelectionListeners(){\n\t\tif(!this.document) {\n\t\t\treturn;\n\t\t}\n\t\tthis.document.removeEventListener(\"selectionchange\", this._onSelectionChange, { passive: true });\n\t\tthis._onSelectionChange = undefined;\n\t}\n\n\t/**\n\t * Handle getting text on selection\n\t * @private\n\t */\n\tonSelectionChange(e){\n\t\tif (this.selectionEndTimeout) {\n\t\t\tclearTimeout(this.selectionEndTimeout);\n\t\t}\n\t\tthis.selectionEndTimeout = setTimeout(function() {\n\t\t\tvar selection = this.window.getSelection();\n\t\t\tthis.triggerSelectedEvent(selection);\n\t\t}.bind(this), 250);\n\t}\n\n\t/**\n\t * Emit event on text selection\n\t * @private\n\t */\n\ttriggerSelectedEvent(selection){\n\t\tvar range, cfirange;\n\n\t\tif (selection && selection.rangeCount > 0) {\n\t\t\trange = selection.getRangeAt(0);\n\t\t\tif(!range.collapsed) {\n\t\t\t\t// cfirange = this.section.cfiFromRange(range);\n\t\t\t\tcfirange = new EpubCFI(range, this.cfiBase).toString();\n\t\t\t\tthis.emit(EVENTS.CONTENTS.SELECTED, cfirange);\n\t\t\t\tthis.emit(EVENTS.CONTENTS.SELECTED_RANGE, range);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Get a Dom Range from EpubCFI\n\t * @param {EpubCFI} _cfi\n\t * @param {string} [ignoreClass]\n\t * @returns {Range} range\n\t */\n\trange(_cfi, ignoreClass){\n\t\tvar cfi = new EpubCFI(_cfi);\n\t\treturn cfi.toRange(this.document, ignoreClass);\n\t}\n\n\t/**\n\t * Get an EpubCFI from a Dom Range\n\t * @param {Range} range\n\t * @param {string} [ignoreClass]\n\t * @returns {EpubCFI} cfi\n\t */\n\tcfiFromRange(range, ignoreClass){\n\t\treturn new EpubCFI(range, this.cfiBase, ignoreClass).toString();\n\t}\n\n\t/**\n\t * Get an EpubCFI from a Dom node\n\t * @param {node} node\n\t * @param {string} [ignoreClass]\n\t * @returns {EpubCFI} cfi\n\t */\n\tcfiFromNode(node, ignoreClass){\n\t\treturn new EpubCFI(node, this.cfiBase, ignoreClass).toString();\n\t}\n\n\t// TODO: find where this is used - remove?\n\tmap(layout){\n\t\tvar map = new Mapping(layout);\n\t\treturn map.section();\n\t}\n\n\t/**\n\t * Size the contents to a given width and height\n\t * @param {number} [width]\n\t * @param {number} [height]\n\t */\n\tsize(width, height){\n\t\tvar viewport = { scale: 1.0, scalable: \"no\" };\n\n\t\tthis.layoutStyle(\"scrolling\");\n\n\t\tif (width >= 0) {\n\t\t\tthis.width(width);\n\t\t\tviewport.width = width;\n\t\t\tthis.css(\"padding\", \"0 \"+(width/12)+\"px\");\n\t\t}\n\n\t\tif (height >= 0) {\n\t\t\tthis.height(height);\n\t\t\tviewport.height = height;\n\t\t}\n\n\t\tthis.css(\"margin\", \"0\");\n\t\tthis.css(\"box-sizing\", \"border-box\");\n\n\n\t\tthis.viewport(viewport);\n\t}\n\n\t/**\n\t * Apply columns to the contents for pagination\n\t * @param {number} width\n\t * @param {number} height\n\t * @param {number} columnWidth\n\t * @param {number} gap\n\t */\n\tcolumns(width, height, columnWidth, gap, dir){\n\t\tlet COLUMN_AXIS = prefixed(\"column-axis\");\n\t\tlet COLUMN_GAP = prefixed(\"column-gap\");\n\t\tlet COLUMN_WIDTH = prefixed(\"column-width\");\n\t\tlet COLUMN_FILL = prefixed(\"column-fill\");\n\n\t\tlet writingMode = this.writingMode();\n\t\tlet axis = (writingMode.indexOf(\"vertical\") === 0) ? \"vertical\" : \"horizontal\";\n\n\t\tthis.layoutStyle(\"paginated\");\n\n\t\tif (dir === \"rtl\" && axis === \"horizontal\") {\n\t\t\tthis.direction(dir);\n\t\t}\n\n\t\tthis.width(width);\n\t\tthis.height(height);\n\n\t\t// Deal with Mobile trying to scale to viewport\n\t\tthis.viewport({ width: width, height: height, scale: 1.0, scalable: \"no\" });\n\n\t\t// TODO: inline-block needs more testing\n\t\t// Fixes Safari column cut offs, but causes RTL issues\n\t\t// this.css(\"display\", \"inline-block\");\n\n\t\tthis.css(\"overflow-y\", \"hidden\");\n\t\tthis.css(\"margin\", \"0\", true);\n\n\t\tif (axis === \"vertical\") {\n\t\t\tthis.css(\"padding-top\", (gap / 2) + \"px\", true);\n\t\t\tthis.css(\"padding-bottom\", (gap / 2) + \"px\", true);\n\t\t\tthis.css(\"padding-left\", \"20px\");\n\t\t\tthis.css(\"padding-right\", \"20px\");\n\t\t\tthis.css(COLUMN_AXIS, \"vertical\");\n\t\t} else {\n\t\t\tthis.css(\"padding-top\", \"20px\");\n\t\t\tthis.css(\"padding-bottom\", \"20px\");\n\t\t\tthis.css(\"padding-left\", (gap / 2) + \"px\", true);\n\t\t\tthis.css(\"padding-right\", (gap / 2) + \"px\", true);\n\t\t\tthis.css(COLUMN_AXIS, \"horizontal\");\n\t\t}\n\n\t\tthis.css(\"box-sizing\", \"border-box\");\n\t\tthis.css(\"max-width\", \"inherit\");\n\n\t\tthis.css(COLUMN_FILL, \"auto\");\n\n\t\tthis.css(COLUMN_GAP, gap+\"px\");\n\t\tthis.css(COLUMN_WIDTH, columnWidth+\"px\");\n\n\t\t// Fix glyph clipping in WebKit\n\t\t// https://github.com/futurepress/epub.js/issues/983\n\t\tthis.css(\"-webkit-line-box-contain\", \"block glyphs replaced\");\n\t}\n\n\t/**\n\t * Scale contents from center\n\t * @param {number} scale\n\t * @param {number} offsetX\n\t * @param {number} offsetY\n\t */\n\tscaler(scale, offsetX, offsetY){\n\t\tvar scaleStr = \"scale(\" + scale + \")\";\n\t\tvar translateStr = \"\";\n\t\t// this.css(\"position\", \"absolute\"));\n\t\tthis.css(\"transform-origin\", \"top left\");\n\n\t\tif (offsetX >= 0 || offsetY >= 0) {\n\t\t\ttranslateStr = \" translate(\" + (offsetX || 0 )+ \"px, \" + (offsetY || 0 )+ \"px )\";\n\t\t}\n\n\t\tthis.css(\"transform\", scaleStr + translateStr);\n\t}\n\n\t/**\n\t * Fit contents into a fixed width and height\n\t * @param {number} width\n\t * @param {number} height\n\t */\n\tfit(width, height, section){\n\t\tvar viewport = this.viewport();\n\t\tvar viewportWidth = parseInt(viewport.width);\n\t\tvar viewportHeight = parseInt(viewport.height);\n\t\tvar widthScale = width / viewportWidth;\n\t\tvar heightScale = height / viewportHeight;\n\t\tvar scale = widthScale < heightScale ? widthScale : heightScale;\n\n\t\t// the translate does not work as intended, elements can end up unaligned\n\t\t// var offsetY = (height - (viewportHeight * scale)) / 2;\n\t\t// var offsetX = 0;\n\t\t// if (this.sectionIndex % 2 === 1) {\n\t\t// \toffsetX = width - (viewportWidth * scale);\n\t\t// }\n\n\t\tthis.layoutStyle(\"paginated\");\n\n\t\t// scale needs width and height to be set\n\t\tthis.width(viewportWidth);\n\t\tthis.height(viewportHeight);\n\t\tthis.overflow(\"hidden\");\n\n\t\t// Scale to the correct size\n\t\tthis.scaler(scale, 0, 0);\n\t\t// this.scaler(scale, offsetX > 0 ? offsetX : 0, offsetY);\n\n\t\t// background images are not scaled by transform\n\t\tthis.css(\"background-size\", viewportWidth * scale + \"px \" + viewportHeight * scale + \"px\");\n\n\t\tthis.css(\"background-color\", \"transparent\");\n\t\tif (section && section.properties.includes(\"page-spread-left\")) {\n\t\t\t// set margin since scale is weird\n\t\t\tvar marginLeft = width - (viewportWidth * scale);\n\t\t\tthis.css(\"margin-left\", marginLeft + \"px\");\n\t\t}\n\t}\n\n\t/**\n\t * Set the direction of the text\n\t * @param {string} [dir=\"ltr\"] \"rtl\" | \"ltr\"\n\t */\n\tdirection(dir) {\n\t\tif (this.documentElement) {\n\t\t\tthis.documentElement.style[\"direction\"] = dir;\n\t\t}\n\t}\n\n\tmapPage(cfiBase, layout, start, end, dev) {\n\t\tvar mapping = new Mapping(layout, dev);\n\n\t\treturn mapping.page(this, cfiBase, start, end);\n\t}\n\n\t/**\n\t * Emit event when link in content is clicked\n\t * @private\n\t */\n\tlinksHandler() {\n\t\treplaceLinks(this.content, (href) => {\n\t\t\tthis.emit(EVENTS.CONTENTS.LINK_CLICKED, href);\n\t\t});\n\t}\n\n\t/**\n\t * Set the writingMode of the text\n\t * @param {string} [mode=\"horizontal-tb\"] \"horizontal-tb\" | \"vertical-rl\" | \"vertical-lr\"\n\t */\n\twritingMode(mode) {\n\t\tlet WRITING_MODE = prefixed(\"writing-mode\");\n\n\t\tif (mode && this.documentElement) {\n\t\t\tthis.documentElement.style[WRITING_MODE] = mode;\n\t\t}\n\n\t\treturn this.window.getComputedStyle(this.documentElement)[WRITING_MODE] || '';\n\t}\n\n\t/**\n\t * Set the layoutStyle of the content\n\t * @param {string} [style=\"paginated\"] \"scrolling\" | \"paginated\"\n\t * @private\n\t */\n\tlayoutStyle(style) {\n\n\t\tif (style) {\n\t\t\tthis._layoutStyle = style;\n\t\t\tnavigator.epubReadingSystem.layoutStyle = this._layoutStyle;\n\t\t}\n\n\t\treturn this._layoutStyle || \"paginated\";\n\t}\n\n\t/**\n\t * Add the epubReadingSystem object to the navigator\n\t * @param {string} name\n\t * @param {string} version\n\t * @private\n\t */\n\tepubReadingSystem(name, version) {\n\t\tnavigator.epubReadingSystem = {\n\t\t\tname: name,\n\t\t\tversion: version,\n\t\t\tlayoutStyle: this.layoutStyle(),\n\t\t\thasFeature: function (feature) {\n\t\t\t\tswitch (feature) {\n\t\t\t\t\tcase \"dom-manipulation\":\n\t\t\t\t\t\treturn true;\n\t\t\t\t\tcase \"layout-changes\":\n\t\t\t\t\t\treturn true;\n\t\t\t\t\tcase \"touch-events\":\n\t\t\t\t\t\treturn true;\n\t\t\t\t\tcase \"mouse-events\":\n\t\t\t\t\t\treturn true;\n\t\t\t\t\tcase \"keyboard-events\":\n\t\t\t\t\t\treturn true;\n\t\t\t\t\tcase \"spine-scripting\":\n\t\t\t\t\t\treturn false;\n\t\t\t\t\tdefault:\n\t\t\t\t\t\treturn false;\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\t\treturn navigator.epubReadingSystem;\n\t}\n\n\tdestroy() {\n\t\t// this.document.removeEventListener('transitionend', this._resizeCheck);\n\n\t\tthis.removeListeners();\n\n\t}\n}\n\nEventEmitter(Contents.prototype);\n\nexport default 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