Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
// KrautZip
// Copyright (c) 2010 Berlinbernd
// Released under the GNU Lesser General Public License
// http://www.gnu.org/copyleft/lgpl.html
//
// ==UserScript==
// @name KrautZip
// @namespace http://dieweltistgarnichtso.net
// @description Zip redundant content.
// @include http://krautchan.net/*
// @include http://krautchan.net/*/*
// @include http://krautchan.net/*/*/*
// @include http://krautchan.net/*/*/*/*
// @include http://www.krautchan.net/*
// @include http://www.krautchan.net/*/*
// @include http://www.krautchan.net/*/*/*
// @include http://www.krautchan.net/*/*/*/*
// ==/UserScript==
// the following function was taken from jsolait <http://jsolait.net/>
// LZW-compress a string
function lzw_encode(s) {
var dict = {};
var data = (s + "").split("");
var out = [];
var currChar;
var phrase = data[0];
var code = 256;
for (var i=1; i<data.length; i++) {
currChar=data[i];
if (dict[phrase + currChar] != null) {
phrase += currChar;
}
else {
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
dict[phrase + currChar] = code;
code++;
phrase=currChar;
}
}
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
for (var i=0; i<out.length; i++) {
out[i] = String.fromCharCode(out[i]);
}
return out.join("");
}
function zip_all() {
var allPosts;
allPosts = document.evaluate(
'//*[starts-with(@id, "post_text")]',
document,
null,
XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
null);
var thisPost;
for (var i = 0; i < allPosts.snapshotLength; i++) {
thisPost = allPosts.snapshotItem(i);
postText = thisPost.innerHTML;
if (postText == '') {
// lzw_encode chokes on zero-lenght strings, skip iteration
continue;
}
ratio = postText.length / lzw_encode(postText).length;
if (ratio < 3) {
// everything went better than expected
} else {
thisPost.innerHTML = '<span style="color:#ff0000; font-weight: bold">(ZIP)</span>';
}
}
}
document.addEventListener("DOMContentLoaded", zip_all, false);
@erlehmann
Copy link
Author

erlehmann commented Aug 28, 2010

Continued in a proper repository: http://github.com/erlehmann/krautzip

Loading

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment