// ==UserScript==
// @name          show pageRank
// @namespace     http://a-h.parfe.jp/einfach/
// @description   Algorithm of computing checksum taken from mozilla module
//                SearchStatus http://www.quirk.biz/searchstatus/
// @include       http://siteexplorer.search.yahoo.com/*
// ==/UserScript==

(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();

links = document.evaluate('//em[@class="yschurl"]', document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
count = 0;
searchPagerankStatus(links.snapshotItem(count));

function searchPagerankStatus(uri)
{
  	var url = new String( 'http://'+uri.innerHTML );
  	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.parentNode.previousSibling.previousSibling.innerHTML += pr;
			if(count<links.snapshotLength-1){
				setTimeout(function(){
					count++;
					searchPagerankStatus(links.snapshotItem(count));
				},500);
			}
		}
	});
}


function setPagerankStatus(temp)
{

//alert(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;
}
})();