Display AcousticBrainz links in release pages

mb_ACOUSTICBRAINZ-LINKS.user.js

// ==UserScript==
// @name         mb. ACOUSTICBRAINZ LINKS (for STalKer-X)
// @version      2015.3.26.1322
// @description  musicbrainz.org: displays AB links in release pages
// @compatible   opera(12)
// @compatible   opera+violentmonkey
// @namespace    https://github.com/jesus2099/konami-command
// @downloadURL  https://gist.github.com/jesus2099/8e223f09d64d831a9514/raw/mb_ACOUSTICBRAINZ-LINKS.user.js
// @updateURL    https://gist.github.com/jesus2099/8e223f09d64d831a9514/raw/mb_ACOUSTICBRAINZ-LINKS.user.js
// @author       PATATE12
// @licence      CC BY-NC-SA 3.0 (https://creativecommons.org/licenses/by-nc-sa/3.0/)
// @since        2015-03-24
// @grant        none
// @include      http*://*.mbsandbox.org/release/*
// @include      http*://*musicbrainz.org/release/*
// @exclude      *.org/release/*/*
// @exclude      *//*/*mbsandbox.org/*
// @exclude      *//*/*musicbrainz.org/*
// @run-at       document-end
// ==/UserScript==
"use strict";
var recordings = document.querySelectorAll("div#content table.tbl > tbody > tr > td a[href*='/recording/']");
for (var rec = 0; rec < recordings.length; rec++) {
	var mbid = recordings[rec].getAttribute("href").match(/\/recording\/([a-f\d]{8}-[a-f\d]{4}-[a-f\d]{4}-[a-f\d]{4}-[a-f\d]{12})$/i);
	if (mbid) {
		var td = !getParent(recordings[rec], "dd") && getParent(recordings[rec], "td");
		if (td) {
			td.appendChild(document.createTextNode(" "));
			var ablink = document.createElement("a");
			ablink.setAttribute("href", "http://acousticbrainz.org/"+mbid[1]);
//			ablink.setAttribute("target", "_blank");
			ablink.style.setProperty("float", "right");
			var abimg = document.createElement("img");
			abimg.setAttribute("src", "data:image/png;base64,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");
			abimg.setAttribute("alt", "AcousticBrainz");
			abimg.setAttribute("title", "AcousticBrainz");
			ablink.appendChild(abimg);
			td.insertBefore(ablink, td.firstChild);
		}
	}
}
function getParent(obj, tag, cls) {
	var cur = obj;
	if (cur.parentNode) {
		cur = cur.parentNode;
		if (cur.tagName == tag.toUpperCase() && (!cls || cls && cur.className.match(new RegExp("\\W*"+cls+"\\W*")))) {
			return cur;
		} else {
			return getParent(cur, tag, cls);
		}
	} else {
		return null;
	}
}