// ==UserScript==
// @name          google pageRank
// @namespace     http://c--v.net/
// @include       http://www.google.*/search*
// ==/UserScript==
//
// Mail: ryosuke a sekido dot info
// Home: http://c--v.net/
// License: Creative Commons by 2.1 Japan
//
// Base Script: http://a-h.parfe.jp/einfach/archives/2006/0414164343.html
//

(function() {
	function googlechcalc()
	{
		return this; 
	}

	googlechcalc.prototype =
	{
		googleNewCh: function( ch )
		{
			ch = ( ( ( ch / 7 ) << 2 ) | ( ( this.myfmod( ch,13 ) ) & 7 ) );

			prbuf = new Array();
			prbuf[0] = ch;
			for( i = 1; i < 20; i++ ) 
			{
				prbuf[i] = prbuf[i-1] - 9;
			}
			ch = this.googleCH( this.c32to8bit( prbuf ), 80 );

			return ch;		
		},

		googleCH: function( url ) 
		{
			var init = 0xE6359A60;

			var length = url.length;

			var a = 0x9E3779B9;
			var b = 0x9E3779B9;
			var c = 0xE6359A60;
			var k = 0;
			var len = length;
			var mixo = new Array(); 

			while( len >= 12 ) 
			{
				a += (url[k+0] +(url[k+1]<<8) +(url[k+2]<<16) +(url[k+3]<<24));
				b += (url[k+4] +(url[k+5]<<8) +(url[k+6]<<16) +(url[k+7]<<24));
				c += (url[k+8] +(url[k+9]<<8) +(url[k+10]<<16)+(url[k+11]<<24));
				mixo = this.mix(a,b,c);
				a = mixo[0]; b = mixo[1]; c = mixo[2];
				k += 12;
				len -= 12;
			}

			c += length;

			switch( len ) 
			{
				case 11:
				c += url[k+10]<<24;

				case 10: 
				c+=url[k+9]<<16;

				case 9 : 
				c+=url[k+8]<<8;

				case 8 : 
				b+=(url[k+7]<<24);

				case 7 : 
				b+=(url[k+6]<<16);

				case 6 : 
				b+=(url[k+5]<<8);

				case 5 : 
				b+=(url[k+4]);

				case 4 : 
				a+=(url[k+3]<<24);

				case 3 : 
				a+=(url[k+2]<<16);

				case 2 : 
				a+=(url[k+1]<<8);

				case 1 : 
				a+=(url[k+0]);
			}

			mixo = this.mix( a, b, c );

			if( mixo[2] < 0 )
			{
				return ( 0x100000000 + mixo[2] );
			}
			else
			{
				return mixo[2];
			}
		},

		hexdec: function( str )
		{
			return parseInt( str, 16 );
		},

		zeroFill: function( a, b )
		{
			var z = this.hexdec( 80000000 );

			if( z & a )
			{
				a = a >> 1;
				a &= ~z;
				a |= 0x40000000;
				a = a >> ( b - 1 );
			} 
			else
			{
				a = a >> b;
			}

			return (a);
		},

		mix: function( a, b, c ) 
		{
			a -= b; a -= c; a ^= ( this.zeroFill( c, 13 ) );
			b -= c; b -= a; b ^= ( a << 8 );
			c -= a; c -= b; c ^= ( this.zeroFill( b, 13 ) );
			a -= b; a -= c; a ^= ( this.zeroFill( c, 12 ) );
			b -= c; b -= a; b ^= ( a << 16);
			c -= a; c -= b; c ^= ( this.zeroFill( b, 5 ) );
			a -= b; a -= c; a ^= ( this.zeroFill( c, 3 ) ); 
			b -= c; b -= a; b ^= ( a << 10);
			c -= a; c -= b; c ^= ( this.zeroFill( b, 15 ) );

			var ret = new Array( (a), (b), (c) );

			return ret;
		},

		strord: function( string ) 
		{
			var result = new Array();
			for( i = 0; i < string.length; i++ ) 
			{
				result[i] = string.substr(i,1).charCodeAt( 0 );
			}

			return result;
		},

		c32to8bit: function( arr32 ) 
		{
			var arr8 = new Array();	

			for( i = 0; i < arr32.length; i++ ) 
			{
				for( bitOrder = i * 4; bitOrder <= i * 4 + 3; bitOrder++ ) 
				{
					arr8[bitOrder] = arr32[i] & 255;
					arr32[i] = this.zeroFill( arr32[i], 8 );
				}
			}

			return arr8;
		},

		myfmod: function( x, y )
		{
			var i = Math.floor( x / y );
			return ( x - i * y );
		}
	};
	function ssUrlEncode( url ) 
	{
		return escape(url).replace(/\+/g, '%2C').replace(/\"/g, '%22').replace(/\'/g, '%27');
	}


	gGoogleCHCalc = new googlechcalc();

	var list = $X("//a[@class='l']");
	try {
		searchPagerankStatus(list, 0);
	} catch (e) {
	}

	function searchPagerankStatus(list, count)
	{
		var uri = list[count];
		var url = uri.href;
		url = url.replace( /\?.*$/g, "?" );

		var reqgr = "info:" + url;
		var reqgre = "info:" + ssUrlEncode( url ).replace( /%2C/, "%2B" ).replace( /_/, "%5F" );
		this.mGoogleCH = gGoogleCHCalc.googleCH( gGoogleCHCalc.strord( reqgr ) );
		this.mGoogleCH = "6" + gGoogleCHCalc.googleNewCh( this.mGoogleCH );

		var querystring = "http://";
		querystring += "toolbarqueries.google.com/search?client=navclient-auto&ch=" + 
									 this.mGoogleCH + "&ie=UTF-8&oe=UTF-8&features=Rank"
			 + "&q=" + reqgre;
		//var x = prompt('',querystring);

		GM_xmlhttpRequest({
			method: 'GET',
			url	 : querystring,
			headers: {'User-Agent': 'Mozilla/4.0 (compatible; GoogleToolbar 2.0.114-big; Windows XP 5.1)'},
			onload:function(response){
				var pr = setPagerankStatus(response.responseText);
				if(pr=='-1') pr = ' [ n/a ]';
				else pr = ' [ '+pr+'/10 ]';
				uri.innerHTML += pr;
			}
		});

		if (list.length > count + 1) {
			setTimeout(function(){
				searchPagerankStatus(list, count + 1);
			}, 500);
		}
	}


	function setPagerankStatus(temp)
	{
		var foo = temp.match(/Rank_.*?:.*?:(\d+)/i);
		var pr = (foo) ? foo[1] : "-1";
		foo = temp.match(/FVN_.*?:.*?:(?:Top\/)?([^\s]+)/i);
		var cat = (foo) ? foo[1] : "n/a";
		return pr;
	}

	/*
	 * template functions
	 * -- Original: http://lowreal.net/logs/2006/03/16/1 by cho45
	 */
	function $X (exp, context) {
		if (!context) context = document;
		var resolver = function (prefix) {
			var o = document.createNSResolver(context)(prefix);
			return o ? o : (document.contentType == "text/html") ? "" : "http://www.w3.org/1999/xhtml";
		}
		var exp = document.createExpression(exp, resolver);

		var result = exp.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: {
				result = exp.evaluate(context, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
				var ret = [];
				for (var i = 0, len = result.snapshotLength; i < len ; i++) {
					ret.push(result.snapshotItem(i));
				}
				return ret;
			}
		}
		return null;
	}
})();