Simple filtering for profanity from website text. Not limited to static text, while avoiding performance impact.
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// ==UserScript==
// @name Profanity Filter
// @author adisib
// @namespace namespace_adisib
// @description Simple filtering for profanity from website text. Not limited to static text, while avoiding performance impact.
// @version 2017.04.02
// @include http://*
// @include https://*
// @grant none
// ==/UserScript==
(function() {
"use strict";
// --- GLOBALS --------
// Display performance and debugging information to the console.
const DEBUG = false;
// set replacement string
const replaceString = "*bleep*";
// words to be filtered list
// This should be ordered by most common first for performance (still TODO, but not important)
// (also should probably be sanitized before dropping into regex)
const words = ['fuck','shit','ass','damn','asshole','bullshit','bitch','piss','goddamn','crap','sh!t','bastard','dumbass','fag','motherfuck','nig','cunt','douche','douchebag','jackass','mothafuck','pissoff','shitfull','fuk','fuckme','fvck','fcuk','b!tch','phuq','phuk','phuck','fatass','faggot','dipshit','fagot','faggit','fagget','assfuck','buttfuck','asswipe','asskiss','assclown'];
// filters the words and any versions with optional endings
// shouldn't run into issues with optional endings; a whitelist would be trivial to implement should it be required
const wordsFilter = new RegExp("\\b(?:" + words.join("|") + ")[tgkp]??(?=(?:ing?(:?ess)??|ed|i??er|a)??(?:e??[syz])??\\b)", "gi");
// --------------------
// Initial slow filter pass that handles static text
function filterStaticText()
{
let startTime, endTime;
if (DEBUG)
{
startTime = performance.now();
}
// Do title first because it is always visible
if (wordsFilter.test(document.title))
{
document.title = document.title.replace(wordsFilter, replaceString);
}
filterNodeTree(document.body);
if (DEBUG)
{
endTime = performance.now();
console.log("PF | Static Text Run-Time (ms): " + (endTime - startTime).toString());
}
}
// --------------------
// filters dynamic text, and handles things such as AJAX Youtube comments
function filterDynamicText()
{
let textMutationObserver = new MutationObserver( function(mutations) { filterMutations(mutations); } );
let TxMOInitOps = { characterData: true, childList: true, subtree: true };
textMutationObserver.observe(document.body, TxMOInitOps);
let title = document.getElementsByTagName("title")[0];
let titleMutationObserver = new MutationObserver( function(mutations) { filterNode(title); } );
let TiMOInitOps = { characterData: true, subtree: true };
titleMutationObserver.observe(title, TiMOInitOps);
}
// --------------------
// Handler for mutation observer from filterDynamicText()
function filterMutations(mutations)
{
let startTime, endTime;
if (DEBUG)
{
startTime = performance.now();
}
for (let i=0; i < mutations.length; ++i)
{
let mutation = mutations[i];
if (mutation.type === "childList")
{
let nodes = mutation.addedNodes;
for (let i=0; i < nodes.length; ++i)
{
filterNodeTree(nodes[i]);
}
}
else if (mutation.type === "characterData")
{
filterNode(mutation.target);
}
}
if (DEBUG)
{
endTime = performance.now();
console.log("PF | Dynamic Text Run-Time (ms): " + (endTime - startTime).toString());
}
}
// --------------------
// Filters a textNode
function filterNode(node)
{
if (wordsFilter.test(node.data))
{
node.data = node.data.replace(wordsFilter, replaceString);
}
}
// --------------------
// Filters all of the text from a node and its decendants
function filterNodeTree(node)
{
if (!node || (node.nodeType !== Node.ELEMENT_NODE && node.nodeType !== Node.TEXT_NODE))
{
return;
}
if (node.nodeType === Node.TEXT_NODE)
{
filterNode(node);
return; // text nodes don't have children
}
let textNodes = document.evaluate(".//text()[string-length() > 2 and not(parent::script or parent::noscript or parent::code)]", node, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
const l = textNodes.snapshotLength;
for (let i=0; i < l; ++i)
{
filterNode(textNodes.snapshotItem(i));
}
}
// --------------------
// Runs the different filter types
function filterPage()
{
filterStaticText();
filterDynamicText();
}
// --- MAIN -----------
filterPage();
})();