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236
experiments/infipage/index.html
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236
experiments/infipage/index.html
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---
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title: Infipage
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description: Outdoing all other websites with <b>INFINITE PAGES!</b>
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url: /infipage/0
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---
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<style>
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#prev, #next {
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text-decoration: none;
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}
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#main {
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padding-top: 10vh;
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font-size: 2em;
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display: flex;
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justify-content: space-around;
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}
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#main.mobile {
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display: block;
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text-align: center;
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}
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#pagecount {
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max-width: 70vw;
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overflow-wrap: break-word;
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}
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#error {
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padding-top: 0.5em;
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color: red;
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text-align: center;
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}
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</style>
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<div id="main">
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<a id="prev">Previous Page</a>
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<div id="pagecount"></div>
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<a id="next">Next Page</a>
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</div>
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<div id="error"></div>
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<script src="https://unpkg.com/big.js@5.2.1/big.js"></script>
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<script>
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Big.PE = Infinity
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Big.DP = 0
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// From MDN somewhere
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if (!String.prototype.startsWith) {
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String.prototype.startsWith = function(search, pos) {
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return this.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
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};
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}
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if (!String.prototype.repeat) {
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String.prototype.repeat = function(times) {
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return new Array(num + 1).join(this);
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};
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}
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function encodeRLEArray(input) {
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var encoding = [];
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var prev, count, i;
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for (count = 1, prev = input[0], i = 1; i < input.length; i++) {
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if (input[i] != prev || count == 35) {
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encoding.push([count, prev])
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count = 1
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prev = input[i]
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}
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else {
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count++
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}
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}
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encoding.push([count, prev])
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return encoding
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}
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function encodeRLEString(rleArr) {
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var out = ""
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rleArr.forEach(function(pair) {
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out += pair[0].toString(36) + pair[1]
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})
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return out
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}
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/*function encodeRLEString2(rleArr) {
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var out = ""
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rleArr.forEach(function(pair) {
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var count = pair[0]
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var char = pair[1]
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if (count !== 1) {
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out += "." + count.toString(36) + char
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} else {
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out += char
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}
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})
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return out
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}*/
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function decodeRLEArray(arr) {
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var out = ""
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arr.forEach(function(pair) {
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out += pair[1].repeat(pair[0])
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})
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return out
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}
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function decodeRLEPair(r) {
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return [ parseInt(r[0], 36), r[1] ]
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}
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function decodeRLEString(str) {
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var results = []
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var re = /[0-9a-z][0-9A-Za-z_-]/g
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var match
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while (match = re.exec(str)) {
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results.push(decodeRLEPair(match[0]))
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}
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return results
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}
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function encodeRLE(str) {
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return encodeRLEString(encodeRLEArray(str))
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}
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function decodeRLE(str) {
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return decodeRLEArray(decodeRLEString(str))
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}
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function b64e(str) {
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return btoa(str).replace(/\+/g, "_").replace(/\//g, "-")
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}
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function b64d(b64) {
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return atob(b64.replace(/_/g, "+").replace(/\-/g, "/"))
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}
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var base = Big(256)
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var basediv2 = base.div(2)
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function addEncoding(arr, func) {
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return arr.concat(arr.map(func))
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}
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function findShortest(arr) {
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return arr.reduce(function(prev, now) {
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if (typeof prev === "string") {
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return now.length < prev.length ? now : prev
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} else {
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return now
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}
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}, null)
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}
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function encodeBignum(b) {
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var out = ""
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var curr = b
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// Pretend it's a positive int until the end
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if (b.s === -1) { curr = b.times(-1) }
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var byte = 0
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while (!curr.eq(0)) {
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var now = curr.mod(base)
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out += String.fromCharCode(+now)
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// Attempt to emulate an actual bitshift
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curr = curr.div(base)
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if (now.gte(basediv2)) { curr = curr.minus(1) }
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}
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var start = b.s === -1 ? "n" : "p"
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var b64 = start + b64e(out)
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var decimal = b.toString()
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var possibilities = [b64, decimal]
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possibilities = addEncoding(possibilities, function(x) { return "r" + encodeRLE(x) })
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return findShortest(possibilities)
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}
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function decodeBignum(str) {
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if (str.startsWith("r")) {
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return decodeBignum(decodeRLE(str.substring(1)))
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}
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// If string is not tagged with its sign, it's just a regular number
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if (!str.startsWith("n") && !str.startsWith("p")) {
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return Big(str)
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}
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var start = str.substring(0, 1)
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var bin = b64d(str.substring(1))
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var out = Big(0)
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// Split string into bytes
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var bytes = bin.split("").map(function(x) { return x.charCodeAt(0) })
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// Add each byte to string, multiplied by 2 ^ its position in string
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bytes.forEach(function(byte, exponent) {
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var thisByte = Big(byte).times(base.pow(exponent))
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out = out.plus(thisByte)
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})
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if (start === "n") { out = out.times(-1) }
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return out
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}
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var page
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var pageString
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var prev = document.querySelector("#prev"), next = document.querySelector("#next"), count = document.querySelector("#pagecount"), main = document.querySelector("#main"), error = document.querySelector("#error")
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function loadPage() {
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try {
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var afterSlash = /infipage\/([A-Za-z0-9_=-]+)/.exec(window.location.pathname)[1]
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page = decodeBignum(afterSlash)
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} catch(e) {
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console.warn("Page Number Decode Failure")
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console.warn(e)
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error.innerText = "Page number invalid - " + e + ". Defaulting to 0."
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page = Big(0)
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}
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pageString = page.toString()
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console.log("Page", pageString)
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var canonical = encodeBignum(page)
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if (canonical !== afterSlash) {
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console.log(canonical, afterSlash, "Mismatch!")
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window.location.href = `/infipage/${canonical}`
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}
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prev.href = encodeBignum(page.minus(1))
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next.href = encodeBignum(page.plus(1))
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pagecount.innerText = "Page " + page.toString()
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}
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loadPage()
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if ("ontouchstart" in window) { main.classList.add("mobile") }
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</script>
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<script>
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window.addEventListener("load", function() {
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if ("points" in window) {
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console.log("running update")
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points.updateMetric("greatestInfipage", function(current) {
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console.log("updated", current, pageString)
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if (!current || page.abs().gt(Big(current))) { return pageString }
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else { return current }
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})
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}
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})
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</script>
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