word-scrambler.user.js

// ==UserScript==
// @name        Word scrambler
// @namespace   https://github.com/blinry
// @description Scrambles words. Based on https://geon.github.io/programming/2016/03/03/dsxyliea
// @include     *
// @version     0.1.0
// @grant       none
// @require     https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
// ==/UserScript==

this.$ = this.jQuery = jQuery.noConflict(true);

"use strict";

$(function() {
    var getTextNodesIn = function(el) {
        return $(el).find(':not(iframe)').addBack().contents().filter(function() {
            return this.nodeType == 3
        })
    };

    function isLetter(char) {
        return /^[\d]$/.test(char)
    }

    function messUpWords() {
        for (var i = 0; i < textNodes.length; i++) {
            var node = textNodes[i];
            for (var j = 0; j < wordsInTextNodes[i].length; j++) {
                if (Math.random() > 1 / 10) {
                    continue
                }
                var wordMeta = wordsInTextNodes[i][j];
                var word = node.nodeValue.slice(wordMeta.position, wordMeta.position + wordMeta.length);
                var before = node.nodeValue.slice(0, wordMeta.position);
                var after = node.nodeValue.slice(wordMeta.position + wordMeta.length);
                node.nodeValue = before + messUpWord(word) + after
            }
        }
    }

    function messUpWord(word) {
        if (word.length < 3) {
            return word
        }
        return word[0] + messUpMessyPart(word.slice(1, -1)) + word[word.length - 1]
    }

    function messUpMessyPart(messyPart) {
        if (messyPart.length < 2) {
            return messyPart
        }
        var a, b;
        while (!(a < b)) {
            a = getRandomInt(0, messyPart.length - 1);
            b = getRandomInt(0, messyPart.length - 1)
        }
        return messyPart.slice(0, a) + messyPart[b] + messyPart.slice(a + 1, b) + messyPart[a] + messyPart.slice(b + 1)
    }

    function getRandomInt(min, max) {
        return Math.floor(Math.random() * (max - min + 1) + min)
    }

    var textNodes = [];
    var wordsInTextNodes = [];

    function findWords() {
        textNodes = getTextNodesIn($('div:not(:has(*)), p, h1, h2, h3, h4, span, a, li, small, button, td'));

        for (var i = 0; i < textNodes.length; i++) {
            var node = textNodes[i];
            var words = [];
            var re = /\w+/g;
            var match;
            while ((match = re.exec(node.nodeValue)) != null) {
                var word = match[0];
                var position = match.index;
                words.push({
                    length: word.length,
                    position: position
                })
            }
            wordsInTextNodes[i] = words
        }
    }

    findWords()
    setInterval(findWords, 10000)
    setInterval(messUpWords, 50)
});