XPath Anchor. This script is unsafe!

XPath_Anchor.user.js

// ==UserScript==
// @name XPath Anchor
// @namespace http://ss-o.net/
// @description XPath Anchor. This script is unsafe!
// @include http://*
// ==/UserScript==

(function (unsafeWindow) {
	var __hash = document.location.hash;
	log(unsafeWindow.document.location.watch);
	if (document.location.__defineGetter__) {
		document.location.__defineGetter__("hash", function() {
			return __hash;
		});
		document.location.__defineSetter__("hash", function(hash) {
			__hash = '#' + hash;
			hashlink();
		});
		window.location.__defineGetter__("hash", function() {
			return __hash;
		});
		window.location.__defineSetter__("hash", function(hash) {
			__hash = '#' + hash;
			hashlink();
		});
	} else if (unsafeWindow.document.location.watch) {
		unsafeWindow.document.location.watch('hash',function (id,oldhash,newhash) {
			__hash = '#' + newhash;
			log(newhash,hashlink+'');
			setTimeout(hashlink,100);
			return newhash;
		});
		unsafeWindow.location.watch('hash',function (id,oldhash,newhash) {
			__hash = '#' + newhash;
			log(newhash,hashlink+'');
			setTimeout(hashlink,100);
			return newhash;
		});
	}
	hashlink();
	function hashlink(){
		var Smooth = true;
		log(__hash+'');
		var hash = /^#(?:(XPath|TEXT)=(.+)|(.+))/.exec(__hash+'');
		log(hash);
		if (!hash)
			return;
		var type = hash[1];
		var path = hash[2];
		log(type,path);
		if (hash[3]) {
			type = 'TEXT';
			path = hash[3];
		}
		if (path.indexOf('%') >= 0) {
			path = decodeURIComponent(path);
		}
		var xpath = ({XPath:path,TEXT:'//*[contains(text(), "' + path + '")]'})[type];
		log(xpath);
		if (!xpath) return;
		var nodetype = document.body.nodeType;
		var pageY = window.pageYOffset;
		$X(xpath).some(function(target){
			if (target.nodeType != nodetype || !target.getBoundingClientRect) return;
			var pos = target.getBoundingClientRect();
			if (pos.top == 0) return;
			if (Smooth)
				TweenFnc({scroll:function(v){window.scrollTo(pos.left,v);}},{scroll:{to:pos.top+pageY,from:pageY},time:0.3});
			else
				window.scrollTo(pos.left,pos.top);
			return true;
		});
	}

function log () {
	if (this.console) {
		this.unsafeWindow.console.log(arguments);
	} else if (window.opera) {
		opera.postError(arguments);
	}
}

// simple version of $X
// $X(exp);
// $X(exp, context);
// @source http://gist.github.com/3242.txt
function $X (exp, context) {
	context || (context = document);
	var expr = (context.ownerDocument || context).createExpression(exp, function (prefix) {
		return document.createNSResolver(context.documentElement || context).lookupNamespaceURI(prefix) ||
			context.namespaceURI || document.documentElement.namespaceURI || "";
	});

	var result = expr.evaluate(context, XPathResult.ANY_TYPE, null);
		switch (result.resultType) {
			case XPathResult.STRING_TYPE : return result.stringValue;
			case XPathResult.NUMBER_TYPE : return result.numberValue;
			case XPathResult.BOOLEAN_TYPE: return result.booleanValue;
			case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
				// not ensure the order.
				var ret = [], i = null;
				while (i = result.iterateNext()) ret.push(i);
				return ret;
		}
	return null;
}
/*
// Tweener Like snippet
new TweenFnc(div.style,{time:1, onComplete:function(){},left:{to:0,from:100,tmpl:"+$#px"}});
*/
function TweenFnc(item, opt) {
	var self = this, TIME = 10, time = opt.time * 1000, TM_EXP = /(\+)?\$([\#\d])/g, count = Math.ceil(time / TIME), sets = [], easing = opt.transition || function(t, b, c, d){return c*t/d + b;}, _T = {time:1,onComplete:1,transition:1,delay:1};
	for (var k in opt) if (!_T[k]) {
		var set = opt[k], from = set.from || parseFloat(item[k]) || 0, values = [], tmpl = set.tmpl || '$#';
		for (var i = 1; i <= count; ++i) {
			var val = easing(i * TIME, from, set.to - from , time);
			values.push(tmpl.replace(TM_EXP, function(m, p, m1){return p && val < 0 ? 0 : (m1 == '#' ? val : val.toFixed(m1));} ));
		}
		sets.push({key:k, values:values, tmpl:tmpl});
	}
	var L = sets.length;
	var run = function(i){
		for (var k = 0; k < L; ++k) item[sets[k].key](sets[k].values[i]);
		if (--count > 0) setTimeout(function(){run.call(self, ++i);},TIME);
		else if (typeof opt.onComplete == 'function') opt.onComplete();
	};
	(typeof opt.delay == "number") ? setTimeout(function(){run(0);},opt.delay*1000) : run(0);
}

})(this.unsafeWindow||window);