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babel.js
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babel.js
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const validChars = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u',
'v', 'w', 'x', 'y', 'z', ',', '.', ' '];
String.prototype.hashCode = function () {
var hash = 0, i, chr;
if (this.length === 0) return hash;
for (i = 0; i < this.length; i++) {
chr = this.charCodeAt(i);
hash = ((hash << 5) - hash) + chr;
hash |= 0; // Convert to 32bit integer
}
return hash;
};
let next = Math.random() * 5;
const rand = () => {
next = next * 1103515245 + 12345;
let ret = ((next / 65536) % (2 ** 31 - 1)) % validChars.length;
next = next % 1103515249;
return ret;
}
const srand = seed => {
next = seed;
}
const randomChar = () => {
let charIndex = Math.floor(rand());
return validChars[charIndex];
}
const generateTitle = () => {
let title = "";
for (let i = 0; i < 10; i++) {
title += randomChar();
}
document.title = title;
document.querySelector("#title").innerHTML += title + "</br>"
}
const generatePage = () => {
// generate lines
for (let i = 0; i < 40; i++) {
let line = "";
//generate letters
for (let j = 0; j < 80; j++) {
line += randomChar();
}
line += "</br>";
document.querySelector("#text").innerHTML += line;
}
}
const attachListeners = () => {
let page = 1;
document.getElementById('page-next').addEventListener('click', () => {
if (page === 410) {
return;
}
let ev = new Event('newpage', { bubbles: true, composed: true })
ev.forward = true;
document.dispatchEvent(ev);
})
document.getElementById('page-back').addEventListener('click', () => {
if (page === 1) {
return;
}
let ev = new Event('newpage', { bubbles: true, composed: true })
ev.forward = false;
document.dispatchEvent(ev);
})
// page state handler
const state = [];
state[page] = next; // get first page initial seed
document.addEventListener('newpage', e => {
if (e.forward) {
page++;
if (state[page] !== undefined) {
srand(state[page])
}
} else {
page--;
// backward will always give a seen page, just seed
srand(state[page])
}
if (state[page] === undefined) {
state[page] = next;
}
document.querySelector("#page-num").innerHTML = page;
document.querySelector("#text").innerHTML = "";
generatePage();
});
}
window.onload = () => {
hexstring = window.prompt("Enter the name of a book (max chars: 25), or open random");
if (hexstring) {
if (hexstring.length > 25) hexstring = hexstring.substring(0, 25);
document.title = `The Library of Babel - ${hexstring}`;
document.querySelector("#title").innerHTML += hexstring + "</br>"
let seednum = hexstring.hashCode();
if (seednum < 0) seednum = -seednum;
srand(seednum);
} else {
generateTitle();
}
attachListeners();
generatePage();
}