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+/*! instant.page v5.1.0 - (C) 2019-2020 Alexandre Dieulot - https://instant.page/license */
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+
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+let mouseoverTimer
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+let lastTouchTimestamp
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+const prefetches = new Set()
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+const prefetchElement = document.createElement('link')
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+const isSupported = prefetchElement.relList && prefetchElement.relList.supports && prefetchElement.relList.supports('prefetch')
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+ && window.IntersectionObserver && 'isIntersecting' in IntersectionObserverEntry.prototype
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+const allowQueryString = 'instantAllowQueryString' in document.body.dataset
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+const allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset
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+const useWhitelist = 'instantWhitelist' in document.body.dataset
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+const mousedownShortcut = 'instantMousedownShortcut' in document.body.dataset
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+const DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION = 1111
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+
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+let delayOnHover = 65
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+let useMousedown = false
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+let useMousedownOnly = false
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+let useViewport = false
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+
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+if ('instantIntensity' in document.body.dataset) {
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+ const intensity = document.body.dataset.instantIntensity
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+
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+ if (intensity.substr(0, 'mousedown'.length) == 'mousedown') {
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+ useMousedown = true
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+ if (intensity == 'mousedown-only') {
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+ useMousedownOnly = true
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+ }
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+ }
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+ else if (intensity.substr(0, 'viewport'.length) == 'viewport') {
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+ if (!(navigator.connection && (navigator.connection.saveData || (navigator.connection.effectiveType && navigator.connection.effectiveType.includes('2g'))))) {
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+ if (intensity == "viewport") {
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+ /* Biggest iPhone resolution (which we want): 414 × 896 = 370944
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+ * Small 7" tablet resolution (which we don’t want): 600 × 1024 = 614400
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+ * Note that the viewport (which we check here) is smaller than the resolution due to the UI’s chrome */
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+ if (document.documentElement.clientWidth * document.documentElement.clientHeight < 450000) {
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+ useViewport = true
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+ }
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+ }
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+ else if (intensity == "viewport-all") {
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+ useViewport = true
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+ }
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+ }
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+ }
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+ else {
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+ const milliseconds = parseInt(intensity)
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+ if (!isNaN(milliseconds)) {
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+ delayOnHover = milliseconds
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+ }
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+ }
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+}
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+
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+if (isSupported) {
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+ const eventListenersOptions = {
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+ capture: true,
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+ passive: true,
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+ }
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+
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+ if (!useMousedownOnly) {
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+ document.addEventListener('touchstart', touchstartListener, eventListenersOptions)
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+ }
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+
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+ if (!useMousedown) {
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+ document.addEventListener('mouseover', mouseoverListener, eventListenersOptions)
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+ }
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+ else if (!mousedownShortcut) {
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+ document.addEventListener('mousedown', mousedownListener, eventListenersOptions)
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+ }
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+
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+ if (mousedownShortcut) {
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+ document.addEventListener('mousedown', mousedownShortcutListener, eventListenersOptions)
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+ }
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+
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+ if (useViewport) {
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+ let triggeringFunction
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+ if (window.requestIdleCallback) {
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+ triggeringFunction = (callback) => {
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+ requestIdleCallback(callback, {
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+ timeout: 1500,
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+ })
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+ }
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+ }
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+ else {
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+ triggeringFunction = (callback) => {
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+ callback()
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+ }
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+ }
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+
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+ triggeringFunction(() => {
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+ const intersectionObserver = new IntersectionObserver((entries) => {
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+ entries.forEach((entry) => {
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+ if (entry.isIntersecting) {
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+ const linkElement = entry.target
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+ intersectionObserver.unobserve(linkElement)
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+ preload(linkElement.href)
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+ }
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+ })
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+ })
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+
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+ document.querySelectorAll('a').forEach((linkElement) => {
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+ if (isPreloadable(linkElement)) {
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+ intersectionObserver.observe(linkElement)
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+ }
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+ })
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+ })
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+ }
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+}
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+
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+function touchstartListener(event) {
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+ /* Chrome on Android calls mouseover before touchcancel so `lastTouchTimestamp`
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+ * must be assigned on touchstart to be measured on mouseover. */
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+ lastTouchTimestamp = performance.now()
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+
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+ const linkElement = event.target.closest('a')
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+
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+ if (!isPreloadable(linkElement)) {
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+ return
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+ }
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+
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+ preload(linkElement.href)
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+}
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+
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+function mouseoverListener(event) {
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+ if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {
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+ return
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+ }
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+
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+ const linkElement = event.target.closest('a')
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+
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+ if (!isPreloadable(linkElement)) {
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+ return
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+ }
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+
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+ linkElement.addEventListener('mouseout', mouseoutListener, {passive: true})
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+
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+ mouseoverTimer = setTimeout(() => {
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+ preload(linkElement.href)
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+ mouseoverTimer = undefined
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+ }, delayOnHover)
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+}
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+
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+function mousedownListener(event) {
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+ const linkElement = event.target.closest('a')
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+
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+ if (!isPreloadable(linkElement)) {
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+ return
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+ }
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+
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+ preload(linkElement.href)
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+}
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+
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+function mouseoutListener(event) {
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+ if (event.relatedTarget && event.target.closest('a') == event.relatedTarget.closest('a')) {
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+ return
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+ }
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+
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+ if (mouseoverTimer) {
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+ clearTimeout(mouseoverTimer)
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+ mouseoverTimer = undefined
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+ }
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+}
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+
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+function mousedownShortcutListener(event) {
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+ if (performance.now() - lastTouchTimestamp < DELAY_TO_NOT_BE_CONSIDERED_A_TOUCH_INITIATED_ACTION) {
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+ return
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+ }
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+
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+ const linkElement = event.target.closest('a')
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+
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+ if (event.which > 1 || event.metaKey || event.ctrlKey) {
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+ return
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+ }
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+
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+ if (!linkElement) {
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+ return
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+ }
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+
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+ linkElement.addEventListener('click', function (event) {
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+ if (event.detail == 1337) {
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+ return
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+ }
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+
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+ event.preventDefault()
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+ }, {capture: true, passive: false, once: true})
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+
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+ const customEvent = new MouseEvent('click', {view: window, bubbles: true, cancelable: false, detail: 1337})
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+ linkElement.dispatchEvent(customEvent)
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+}
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+
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+function isPreloadable(linkElement) {
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+ if (!linkElement || !linkElement.href) {
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+ return
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+ }
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+
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+ if (useWhitelist && !('instant' in linkElement.dataset)) {
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+ return
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+ }
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+
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+ if (!allowExternalLinks && linkElement.origin != location.origin && !('instant' in linkElement.dataset)) {
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+ return
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+ }
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+
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+ if (!['http:', 'https:'].includes(linkElement.protocol)) {
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+ return
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+ }
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+
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+ if (linkElement.protocol == 'http:' && location.protocol == 'https:') {
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+ return
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+ }
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+
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+ if (!allowQueryString && linkElement.search && !('instant' in linkElement.dataset)) {
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+ return
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+ }
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+
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+ if (linkElement.hash && linkElement.pathname + linkElement.search == location.pathname + location.search) {
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+ return
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+ }
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+
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+ if ('noInstant' in linkElement.dataset) {
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+ return
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+ }
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+
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+ return true
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+}
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+
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+function preload(url) {
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+ if (prefetches.has(url)) {
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+ return
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+ }
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+
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+ const prefetcher = document.createElement('link')
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+ prefetcher.rel = 'prefetch'
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+ prefetcher.href = url
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+ document.head.appendChild(prefetcher)
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+
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+ prefetches.add(url)
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+}
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biotorrents
4 years ago