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No Embed Youtube

replace embed iframe, object with anchor link.

当前为 2014-05-23 提交的版本，查看 最新版本。

// ==UserScript==
// @name        No Embed Youtube
// @description	replace embed iframe, object with anchor link.
// @namespace   eight04.blogspot.com
// @include     http*
// @exclude		http://www.youtube.com/watch*
// @exclude		https://www.youtube.com/watch*
// @version     1.0
// @grant       none
// @run-at		document-start
// ==/UserScript==

/*
embed code from youtube:
<iframe width="420" height="315" src="//www.youtube.com/embed/MOyueLEw2xo" frameborder="0" allowfullscreen></iframe>
<object width="420" height="315"><param name="movie" value="//www.youtube.com/v/MOyueLEw2xo?hl=zh_TW&amp;version=3"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="//www.youtube.com/v/MOyueLEw2xo?hl=zh_TW&amp;version=3" type="application/x-shockwave-flash" width="420" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>
*/

"use strict";

if(/youtube\.com\/(v|embed)\//.test(window.location.href)){
	// stop iframe loading
	window.location.href = "about:blank";
	// is there a better way to pause page?
	window.stop();
	alert("pause");
	
}else{
	let xpath = "//iframe[contains(@src,'youtube.com/embed/')]|" +
		"//object[./param[contains(@value,'youtube.com/v/')]]|" +
		"//embed[contains(@src,'youtube.com/v/') and not(ancestor::object)]";
	
	let unEmbed = function(node){
		
		let result = document.evaluate(
			xpath, node, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
		
		let i = 0;
		let element = null;
		
		while(element = result.snapshotItem(i++)){
			// iframe or embed
			let url = element.src;
			
			// object
			if(!url){
				for(let i = 0; i < element.childNodes.length; i++){
					let pa = element.childNodes[i];
					if(pa.getAttribute("name") == "movie"){
						url = pa.getAttribute("value");
						break;
					}
				}
			}
			
			if(!url){
				console.log("can't find url!", element);
				continue;
			}
			
			let id = url.match(/(embed|v)\/(.+?)(\?|&|$)/)[2];
			let a = document.createElement("a");
			let pageUrl = "http://www.youtube.com/watch?v=" + id;
			a.appendChild(document.createTextNode(pageUrl));
			a.setAttribute("href", pageUrl.replace("http:", ""));
			a.setAttribute("target", "_blank");
			a.className = "unembed";
			
			element.parentNode.replaceChild(a, element);
		}
	};
	
	document.addEventListener("DOMNodeInserted", function(e){
		unEmbed(e.target);
		// alert("pause");
	}, false);
}