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// ==UserScript==
// @name           Google Scholar Citation Explorer
// @namespace      ScholarsLittleHelper
// @description    Scholar's Little Helper
// @include        http://scholar.google.com/scholar*
// ==/UserScript==

window.slh_MAX_CITATIONS = 1000;
window.slh_CHUNKSIZE = 100;
window.slh_SLEEP_BETWEEN_HITS = true;

function slh_main()	{
	// setup
	window.slh_ce_citations = new Object;
	window.slh_ce_citetext  = new Object;
	window.slh_ce_pc	    = 0;
	window.slh_ce_stattext  = " ";
	window.slh_parser_div = document.createElement('div');

	// parse the results on the current page
	window.slh_docs_on_page = slh_parser(document.body.innerHTML);
	window.slh_cited_docs_on_page = new Object;
	for(var i = 0; i < slh_docs_on_page.length; i++)
		if(slh_docs_on_page[i][1] > 0)	
			slh_cited_docs_on_page[slh_docs_on_page[i][0].toString()] = slh_docs_on_page[i].toString();

	// add UI elements to the page
	slh_add_checkboxes();
	slh_add_notification_div();
	slh_add_citexplore_div();
	slh_update_notification();
	window.addEventListener('resize', slh_resize, true);	
}

//
// adds checkboxes next to results that can be selected
//
function slh_add_checkboxes()	{
	var allAnchors = document.getElementsByTagName('a');
	for(var a = 0; a < allAnchors.length; a++)	
		if(allAnchors[a].innerHTML.match(/Cited by/i))	{
			var doc_id = allAnchors[a].getAttribute('href').match(/cites=[0-9]+/i)[0].replace(/cites=/i, '');
			var checkbox_span = document.createElement('span');
			checkbox_span.innerHTML = "<input type='checkbox' id='slh_checkbox_"+doc_id+"'><font color='#aa0000'> Explore citations</font></input> ";
			allAnchors[a].parentNode.insertBefore(checkbox_span, allAnchors[a]);
			var elem = document.getElementById('slh_checkbox_'+doc_id);
			elem.addEventListener("click", slh_checkbox_clicked, true);
			elem.checked = (GM_getValue('slh_data'+doc_id) == undefined) ? false : true;
		}		
}

//
// adds a light blue background notification area to the top of a Scholar results page
//
function slh_add_notification_div()	{
	var notify_div = document.createElement('div');
	notify_div.id = 'slh_notify_div';
	notify_div.style.border = "solid 1px black";
	notify_div.style.backgroundColor = "#d6e3ff";
	notify_div.style.padding = "10px";
	notify_div.style.marginBottom = "10px";
	notify_div.innerHTML = "<b>Scholar's Little Helper</b>: You have selected <a href='#' id='slh_notify_docs_selected'>0 documents</a>. Click to start the <a href='#' id='slh_action'>citation explorer</a>.<br><div style='display: none;' id='slh_notify_doc_list'></div>";

	var hdr_table = document.getElementsByTagName('table')[0];
	hdr_table.parentNode.insertBefore(notify_div, hdr_table.nextSibling);
	document.getElementById('slh_notify_docs_selected').addEventListener("click", slh_notify_show_sels, true);		
	document.getElementById('slh_action').addEventListener("click", slh_citexplore, true);		
}

//
// creates the main overlay DIV for the citation explorer
//
function slh_add_citexplore_div()	{
	var ce_div = document.createElement('div');
	var ce_bkg_div = document.createElement('div');
	ce_div.id = 'slh_ce_div';
	ce_div.style.position = 'absolute';
	ce_div.style.top = '92px';
	ce_div.style.backgroundColor = 'white';
	ce_div.style.left = '30px';
	ce_div.style.padding = '15px';
	ce_div.style.paddingBottom = '25px';
	ce_div.style.border = '3px solid gray';
	ce_div.style.zIndex = 10;
	ce_div.style.overflow = 'scroll';
	ce_div.style.overflowX = 'hidden';
	ce_div.style.overflowY = 'auto';
	ce_div.style.visibility = 'hidden';

	ce_bkg_div.id = 'slh_ce_bkg_div';
	ce_bkg_div.style.position = 'absolute';
	ce_bkg_div.style.backgroundColor = 'black';
	ce_bkg_div.style.top = '0px';
	ce_bkg_div.style.left = '0px';
	ce_bkg_div.style.opacity = '0.8';
	ce_bkg_div.style.zIndex = 9;		
	ce_bkg_div.style.visibility = 'hidden';

	var ih= "<b><table border=0 width='100%' cellpadding=0 cellspacing=0><tr><td valign='left'>"+
		"<b><font color='red'>Citation Explorer</font></b><br>Show all common citations for a subset of documents you select."+
		"</td><td valign='middle' align='right'><b><span style='margin-right:30px'><a href='#' id='slh_print_button'></a></span>"+
		"<a href='#' id='slh_close_button'>Close</a></b></td></tr></table><div style='width: 100%; margin-top: 10px' id='slh_ce_main'></div>";

	ce_div.innerHTML = ih;
	document.body.appendChild(ce_div);
	document.body.appendChild(ce_bkg_div);
	document.getElementById('slh_close_button').addEventListener("click", slh_ce_close, true);
	document.getElementById('slh_print_button').addEventListener("click", slh_ce_print, true);
	slh_resize();
}

//
// responds to the browser window being resized
//
window.slh_resize = function()	{
	var ce_div = document.getElementById('slh_ce_div');
	var ce_bkg_div = document.getElementById('slh_ce_bkg_div');
	ce_div.style.width = (window.innerWidth-120) + "px";
	ce_div.style.height = (window.innerHeight-170) + "px";
	ce_bkg_div.style.width = window.innerWidth + "px";
	ce_bkg_div.style.height = (window.scrollMaxY + window.innerHeight) + "px";

	var prog = document.getElementById('slh_progress_bar');
	if(prog != undefined)
		prog.style.width = Math.round((window.slh_ce_pc/100.0) * (window.innerWidth-144)) + "px";
}

//
// shows/hides the document list in the notification area
//
window.slh_notify_show_sels = function()	{
	var x = document.getElementById('slh_notify_doc_list');
	x.style.display = (x.style.display== 'block') ? 'none' : 'block';
}

//
// updates the notification area
//
window.slh_update_notification = function()	{
	var docs = GM_listValues('slh_data');
	document.getElementById('slh_notify_docs_selected').innerHTML = docs.length + " document" + (docs.length==1?"":"s");

	var div_doclist = document.getElementById('slh_notify_doc_list');
	var ih = "<table border=0 cellpadding='0px' cellspacing='10px'>";
	for(var d = 0; d < docs.length; d++)	{
		var doc = GM_getValue(docs[d]);
		if(doc == undefined)
			continue;
		var cite_id = doc.match(/^[0-9]+/)[0];
		var num_cited = doc.match(/,[0-9]+/)[0];
		var doc_txt = doc.replace(/^.*?,.*?,/, '');
		ih += '<tr><td>'+doc_txt+'</td><td valign="middle"><a href="#" id="slh_notify_remove_'+cite_id+'"><b>Remove from list</b></a></td></tr>';
	}	
	ih += "</table>";		// a little hackish because current FF doesn't seem to like direct innerHTML string appends
	div_doclist.innerHTML = ih;
	for(var d = 0; d < docs.length; d++)	{
		var doc = GM_getValue(docs[d]);
		if(doc == undefined)
			continue;
		var cite_id = doc.match(/^[0-9]+/)[0];
		document.getElementById('slh_notify_remove_'+cite_id).addEventListener('click', slh_notify_remove_item, true);		
	}

	var x = document.getElementById('slh_notify_div');
	if(docs.length == 0)
		x.style.display = 'none';
	else 
		x.style.display = 'block';
}

//
// event handler for an item being removed from the notification area
//
window.slh_notify_remove_item = function()	{
	var doc_id = this.id.match(/[0-9]+/)[0];
	GM_deleteValue('slh_data'+doc_id);
	var x = document.getElementById('slh_checkbox_'+doc_id);
	if(x != null)
		x.checked = false;
	slh_update_notification();
}

//
// event handler for a checkbox being clicked
//
window.slh_checkbox_clicked = function()	{
	var doc_id = this.id.replace(/slh_checkbox_/, '');
	if(this.checked == true)
		GM_setValue('slh_data'+doc_id, slh_cited_docs_on_page[doc_id]);
	else
		GM_deleteValue('slh_data'+doc_id);
	slh_update_notification();
}

// 
// a primitive little parser for Google Scholar pages
//
window.slh_parser = function(doc)	{
	var result = new Array();

	// find all documents with 1 or more citations
	doc = doc.replace(/[\n\r\f]/g, ' ');
	doc = doc.replace(/class=yC[01]/g, '');
	var Dox = doc.match(/<h3>.*?Related articles\s*<\/a>.*?<\/font>/gi);
	if(Dox == null)	
		return result;

	// clean up results and collect in a nested array
	for(var i = 0; i < Dox.length; i++)	{
		var thisDoc = new Array();		
		var doc_id = Dox[i].match(/cites=[0-9]+/i);
		var num_cited = 0;
		if(doc_id == null)	{
			// this doc has not been cited, try getting the cluster ID
			var doc_id = Dox[i].match(/cluster=[0-9]+/i);
			if(doc_id == null)
				// no cite id and no cluster id, generate a makeshift ID
				doc_id = slh_hash(Dox[i]);
		} else {		
			doc_id = doc_id[0].replace(/cites=/i, '');
			num_cited = Dox[i].match(/Cited by [0-9]+/i)[0].replace(/Cited by /i, '');
			if(num_cited > window.slh_MAX_CITATIONS)
				num_cited = window.slh_MAX_CITATIONS;
		}	
		thisDoc.push(doc_id, num_cited, Dox[i])
			result.push(thisDoc);
	}

	return result;
}

//
// generic error handler
//
window.slh_error = function(err)	{
	alert(err);
	window.slh_ce_close();
}

//
// populate the CE window with the current intersection of citations
// 
window.slh_ce_update_intersection = function()	{
	var result = undefined;

	// calculate intersection
	for(var r = 0; r < window.slh_ce_roots.length; r++)	{
		var root = window.slh_ce_roots[r];
		var root_cache = window.slh_ce_citecache[root[0]];
		if(document.getElementById('slh_ce_sel_'+r).checked)	{
			if(result == undefined)	
				result = root_cache.slice(0);
			else
				result = slh_ce_isect(result, root_cache);
			if(result.length == 0)
				break;
		}
	}

	// dump the results
	var ih = "";
	if(result != undefined && result.length > 0)	{
		for(var x = 0; x < result.length; x++)
			ih += window.slh_ce_txtcache[result[x]] + '<p>';
	}
	else
		ih = "No common citations.";
	document.getElementById('slh_ce_isect').innerHTML = ih;
}
window.slh_ce_isect = function(a1, a2)	{
	var p1 = 0;
	var p2 = 0;
	var isect = new Array();
	while(p1 < a1.length && p2 < a2.length)	
		if(a1[p1].toString() == a2[p2].toString())	{
			isect.push(a1[p1]);
			p1++;
			p2++;
		} else	
			if(a1[p1].toString() < a2[p2].toString())
				p1++;
			else
				p2++;

		return isect;
}



//
// the main citation explorer mini-application
// consider this the entry point for it, or a modal dialog on top of
// Google Scholar
//
window.slh_citexplore = function()	{
	// check if we have enough documents to compare (i.e., more than 1)
	var docs = GM_listValues('slh_data');
	if(docs.length < 2)	{
		alert("Please select at least two documents before starting the citation explorer.");
		return;		
	}

	// show our "dialog box" and get a handle to our div
	var ce_nd  = document.getElementById('slh_notify_div').parentNode;
	ce_nd.style.overflow = 'hidden';
	var ce_div = document.getElementById('slh_ce_div');
	var ce_bkg_div = document.getElementById('slh_ce_bkg_div');
	ce_div.style.visibility = 'visible';
	ce_bkg_div.style.visibility = 'visible';	
	var ce_mainwnd = document.getElementById('slh_ce_main');
	if(ce_mainwnd == null)
		return slh_error('Cannot start citation explorer.');

	// set up initial window elements (progress bar and a table for showing progress details)
	var ih= "<div id='slh_progress_bar' style='width: 5px; background-color: #d6e3ff; border: 1px solid gray; color: #aa0000; padding-top: 10px; padding-bottom: 10px; font-size: 16pt; font-weight: bold; text-align: center;'>0%</div>"+
		"<font size=-1>Downloaded <b><span id='slh_progress_bar_text'>0 of 0</span></b> citations.<br><b>Status: </b><span id='slh_progress_txtstatus'> </span></font>"+
		"<p><table border=0 cellpadding='10px' cellspacing='10px' id='slh_ce_prog_table'>"+
		"<tr><td><b>Citations</b></td><td><b>Document</b></td></tr>"
		+"</table>";
	ce_mainwnd.innerHTML = ih;		
	var slh_ce_prog_table = document.getElementById('slh_progress_table');

	// prepare the citation root list:
	// PRE: none
	window.slh_ce_roots = new Array();
	window.slh_ce_at_root = 0;
	window.slh_ce_total_cites = 0;
	for(var d = 0; d < docs.length; d++)	{
		var doc = GM_getValue(docs[d]);
		var doc_id = doc.match(/^[0-9iA-Za-z]+/)[0];
		var doc_num_cited = parseInt(doc.match(/,[0-9]+/)[0].substring(1));
		var doc_txt = doc.replace(/^.*?,.*?,/, '');
		var curDoc = new Array();
		curDoc.push(doc_id, doc_num_cited, doc_txt);
		window.slh_ce_roots.push(curDoc);
		window.slh_ce_total_cites += doc_num_cited;
	}
	// POST: slh_ce_roots[0...#roots] = [ [doc_id, doc_num_cited, doc_txt], ... ]
	//	     slh_ce_total_cites = total # of citations for all checked documents

	// set the initial state for the citation downloader
	window.slh_down_quit_flag = false;
	window.slh_ce_at_root = 0;
	window.slh_ajax_result = new Array();
	return slh_get_citations();
}

//
// gets all citing documents using either the internal cache or ajax requests
// to the server
// PRE:  slh_ce_roots[0...#roots] = [ [doc_id, doc_num_cited, doc_txt], ... ]
// POST: slh_ce_citations{doc_id t} = [citing doc 1, ... ] for all 't' in [0...#roots]
//       slh_ce_citetext{doc_id t} = "<citation html for t>"
//       calls slh_downloader_finished() when all roots have a citation list in slh_ce_citations
//
window.slh_get_citations = function()  {
	if(window.slh_ce_at_root >= window.slh_ce_roots.length) {
		// clear up the call stack a bit
		document.getElementById('slh_ce_main').innerHTML = "";
		window.setTimeout(slh_downloader_finished, 300);
		return;
	}
	var root = window.slh_ce_roots[window.slh_ce_at_root];

	// add row for current root to progress table
	if(window.slh_ajax_result.length == 0 && root[1] > 0) {
		// add the information to the progress table
		var row = document.getElementById('slh_ce_prog_table').insertRow(1);
		var t1 = document.createElement('div');
		var t2 = document.createElement('div');
		t1.innerHTML = root[2];
		t2.innerHTML = '0 of '+(root[1]>slh_MAX_CITATIONS?slh_MAX_CITATIONS+"+":root[1]);
		t2.style.fontSize = '16pt';
		var cell1 = row.insertCell(0).appendChild(t2);
		var cell2 = row.insertCell(1).appendChild(t1);		
		window.slh_down_statcell = t2;		
		window.slh_down_statcell2 = t1;
	}

	// check if each root is already in the cache (no need to hit server then)
	if(root[0] in window.slh_ce_citations)  {
		// already in the cache (slh_ce_citations)
		window.slh_ajax_result.length = root[1]>slh_MAX_CITATIONS?slh_MAX_CITATIONS:root[1];
		slh_citation_downloader_status();
		window.slh_ce_at_root++;
		if(window.slh_ajax_result.length > 0)
			window.slh_ajax_result = new Array();
		window.setTimeout(slh_get_citations, 50);
		return;
	} else {
		// not in cache, check progress on current ajax request needs to be initiated
		if(window.slh_ajax_result.length >= (root[1]<window.slh_MAX_CITATIONS?root[1]:window.slh_MAX_CITATIONS))	{
			// done with this root
			window.slh_ce_citations[root[0]] = window.slh_ajax_result;
			slh_citation_downloader_status();
			window.slh_ce_at_root++;
			window.slh_ajax_result = new Array();
			window.setTimeout(slh_get_citations, 50);
			return;
		} else {
			// need more ajax requests
			window.slh_ajax_url = 'http://scholar.google.com/scholar?num='+window.slh_CHUNKSIZE+'&hl=en&lr=&safe=off&cites='+root[0]+'&start='+window.slh_ajax_result.length+'&sa=N';
			window.setTimeout(slh_ajax_hit_server, window.slh_SLEEP_BETWEEN_HITS ? 1500 + Math.floor(Math.random()*2000) : 50);
			window.slh_ce_stattext = "Waiting for a bit...";
			slh_citation_downloader_status();
			return;
		}
	}
}

window.slh_ajax_hit_server = function()  {
	window.slh_ce_stattext = "Requesting more citations.";
	GM_xmlhttpRequest({
method: 'GET',
url: window.slh_ajax_url,
headers: {'Accept': 'text/html',
'User-agent': 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a3pre) Gecko/20070330'	},
onload: slh_ajax_success,
onerror: slh_ajax_error });
}
window.slh_ajax_error = function(resp)	{
	alert("Error "+resp.status+" parsing response from the server.");
	slh_ce_close();
}
	window.slh_ajax_success = function(resp)    {
		if(parseInt(resp.status) != 200)
			return slh_ajax_error(resp)
				var root = window.slh_ce_roots[window.slh_ce_at_root];
		window.slh_ce_stattext = "Received more citations.";

		// process the results
		var parsed = slh_parser(resp.responseText);
		for(var d = 0; d < parsed.length; d++)	{
			var docid = parsed[d][0];
			window.slh_ajax_result.push(docid);
			window.slh_ce_citetext[docid] = parsed[d][2];		
		}

		// get the latest estimate of the total number of results
		resp.responseText = resp.responseText.replace(/,/g, '');
		var cur_start = resp.responseText.match(/Results <b>[0-9]+/i);
		var cur_end   = resp.responseText.match(/Results <b>[0-9]+<\/b>\s*-\s*<b>[0-9]+/i);
		var cur_total = resp.responseText.match(/[0-9]+<\/b>\s*of.*?<b>[0-9]+/i);
		if(resp.responseText.match(/Sorry,? we didn/i) != null)	{
			cur_start = 0; cur_total = 0; cur_end = 0;
			root[1] = 0;
		} else {
			if(cur_start == null || cur_end == null || cur_total == null)	
				return slh_ajax_error(resp);
			cur_start = cur_start[0].match(/[0-9]+/)[0];
			cur_end   = cur_end[0].replace(/.*<b>/, '');
			cur_total = cur_total[0].replace(/.*<b>/, '');
		}

		// update citation estimates
		if(cur_total <= window.slh_MAX_CITATIONS && cur_total < root[1])	{
			root[1] = cur_total;
			// TODO: update num_cited values in GM persistent storage
		}

		if(cur_end-cur_start+1 < window.slh_CHUNKSIZE)  
			// no more results
			root[1] = window.slh_ajax_result.length;

		slh_citation_downloader_status();
		window.setTimeout(slh_get_citations, 50);
	}


window.slh_citation_downloader_status = function()	{
	// calculate progress
	var total_prog = 0;
	var total_cites = 0;
	for(var r = 0; r < window.slh_ce_roots.length; r++)	{
		var root = window.slh_ce_roots[r];
		if(window.slh_ce_at_root > r)	{
			total_cites += parseInt(window.slh_ce_citations[root[0]].length);
			total_prog += parseInt(window.slh_ce_citations[root[0]].length);
		} else	{
			if(window.slh_ce_at_root == r)  {
				total_cites += parseInt(root[1]);
				total_prog  += parseInt(window.slh_ajax_result.length);
			} else 
				total_cites += parseInt(root[1]);
		}
	}

	// update progress indicators
	var pc = Math.round(total_prog*100.0 / total_cites);
	document.getElementById('slh_progress_bar').innerHTML = pc + "%";
	document.getElementById('slh_progress_bar').style.width = Math.round((pc/100.0) * (document.getElementById('slh_ce_div').style.width.match(/[0-9]+/)[0]-24)) + "px";
	document.getElementById('slh_progress_bar_text').innerHTML = total_prog+' of '+total_cites;
	document.getElementById('slh_progress_txtstatus').innerHTML = window.slh_ce_stattext;
	var act_root = window.slh_ce_roots[window.slh_ce_at_root];
	if(act_root != null && "slh_down_statcell" in window)
		window.slh_down_statcell.innerHTML = window.slh_ajax_result.length+' of '+(act_root[1]>window.slh_MAX_CITATIONS?window.slh_MAX_CITATIONS:act_root[1]);
	window.slh_ce_pc = pc;
}

//
// post-downloading screen setup
// to be called from slh_get_citations() after all citations have been successfully downloaded.
// PRE: slh_ce_citations{doc_id} = [ citing doc 1, ... ]
//      slh_ce_citetext{doc_id} = "<citation html>"
//      slh_ce_roots is populated with the roots
//
window.slh_downloader_finished = function()	{
	window.slh_ce_stattext = "Done.";

	var ce_mainwnd = document.getElementById('slh_ce_main');
	ce_mainwnd.innerHTML = "<table border=0 cellpadding='5px' cellspacing='5px' id='slh_ce_selector_table'><tr style='background-color: #d6e3ff;'><td><b>Document #</b></td><td>"+
		"<b>Include</b></td><td><b>Citation</b></td></tr></table><hr><div id='slh_ce_isect'></div><p><hr><font size=-2>Copyright &copy; 2009 <a href='http://compbio.cs.uic.edu/~mayank/software/slh/'>Mayank Lahiri</a>, version 1.2</font>";
	document.getElementById('slh_print_button').innerHTML = "Printable version";

	// add documents to the intersection selector table
	for(var r = 0; r < window.slh_ce_roots.length; r++)	{
		var root = window.slh_ce_roots[r];
		var cites = window.slh_ce_citations[root[0]];
		cites.sort();

		// add to the table
		var row = document.getElementById('slh_ce_selector_table').insertRow(-1);	
		row.style.backgroundColor = 'white';
		var t1 = document.createElement('div');
		var t2 = document.createElement('div');
		var t3 = document.createElement('div');
		t1.innerHTML = r+1;
		t1.style.textAlign = 'center';
		t2.innerHTML = "<input type='checkbox' checked='true' id='slh_ce_sel_"+r+"' style='width: 50px; height: 80px; padding: 0px;'> </input>";
		t3.innerHTML = root[2].replace(/Cited by [0-9]+/i, "Cited by "+root[1]);
		t1.style.fontSize = '24pt';
		var cell1 = row.insertCell(0).appendChild(t1);
		var cell2 = row.insertCell(1).appendChild(t2);		
		var cell3 = row.insertCell(2).appendChild(t3);		
		document.getElementById('slh_ce_sel_'+r).addEventListener("click", slh_ce_update_intersection, true);
	}
	slh_ce_update_intersection();
}

//
// updates the document list with the currently selected (via checkboxes)
// intersection set
//
// can be called independently but also the click event handler for checkboxes
//
window.slh_ce_update_intersection = function()	{
	// calculate intersection
	var result = undefined;
	for(var r = 0; r < window.slh_ce_roots.length; r++)	{
		var root = window.slh_ce_roots[r];
		var cites = window.slh_ce_citations[root[0]];
		if(document.getElementById('slh_ce_sel_'+r).checked)	{
			if(result == undefined)	
				result = cites.slice(0);    // deep copies cites to result
			else
				result = slh_ce_isect(result, cites);
			if(result.length == 0)
				break;
		}
	}
	// POST: result holds the current intersection

	// dump the results
	var ih;
	if(result != undefined && result.length > 0)	{
		ih = result.length + " results.<p>";
		for(var x = 0; x < result.length; x++)
			ih += window.slh_ce_citetext[result[x]] + '<p>';
	}
	else
		ih = "No common citations.";
	document.getElementById('slh_ce_isect').innerHTML = ih;
}
window.slh_ce_isect = function(a1, a2)	{
	var p1 = 0;
	var p2 = 0;
	var isect = new Array();
	while(p1 < a1.length && p2 < a2.length)	
		if(a1[p1].toString() == a2[p2].toString())	{
			isect.push(a1[p1]);
			p1++;
			p2++;
		} else	
			if(a1[p1].toString() < a2[p2].toString())
				p1++;
			else
				p2++;
		return isect;
}



//
// close citation explorer mini-window
// abort any pending XMLHttp requests gracefully
//
window.slh_ce_close = function() {
	// hide the DIVs and set the download thread quitting flag
	var ce_div = document.getElementById('slh_ce_div');
	var ce_bkg_div = document.getElementById('slh_ce_bkg_div');
	ce_div.style.visibility = 'hidden';
	ce_bkg_div.style.visibility = 'hidden';	
	var ce_nd  = document.getElementById('slh_notify_div').parentNode;
	ce_nd.style.overflow = 'auto';
	window.slh_down_quit_flag = true;
	document.getElementById('slh_print_button').innerHTML = "";
}

//
// very simple hash function -- do not use ANYWHERE else but here
//
window.slh_hash = function(txt)	{
	var result = "";
	var t = "";

	window.slh_parser_div.innerHTML = txt;
	var r = window.slh_parser_div.getElementsByTagName('*');	
	if(r == null)	{
		slh_error("Cannot PARSE!!");
		return;
	} else
		for(var i = 0; i < r.length; i++)
			if(r[i].innerHTML.match(/</) == null)
				t = t + '--' + r[i].innerHTML;

	for(var i = 0; i < t.length; i+=3)	{
		var c = t.charAt(i);
		if(c.match(/[a-zA-Z0-9]/))
			result = result + c;
	}
	return result;
}


//
// generates a printable version of the citation list
//
window.slh_ce_print_sorter = function(b,a)	{
	return window.slh_temp_isect[a].length < slh_temp_isect[b].length ? -1 : (slh_temp_isect[a].length > slh_temp_isect[b].length ? 1 : 0);
}
window.slh_ce_print = function()	{
	var pwin = window.open('', 'Google Scholar Citation Explorer Results-to-go', 'resizable=yes,toolbar=no,location=no,menubar=yes,personalbar=no,status=no,scrollbars=yes');
	pwin.document.body.innerHTML = '<head></head>'
		var ih = "<table border=0 cellpadding='5px' cellspacing='5px' id='slh_ce_selector_table'><tr style='background-color: #d6e3ff;'><td><b>Document #</b></td><td>Citation</td></tr>";

	// transfer stylesheets to printy window
	var styles = document.getElementsByTagName('style');
	for(var s = 0; s < styles.length; s++)	{
		var styl = styles[s].cloneNode(true);
		pwin.document.getElementsByTagName('head')[0].appendChild(styl);
	}

	// add root citations
	for(var r = 0; r < window.slh_ce_roots.length; r++)	{
		var root = window.slh_ce_roots[r];
		ih += "<tr><td style='font-size: 28pt; text-align: center'>"+(r+1)+"</td><td>"+root[2]+"</td></tr>";
	}
	ih += "</table><p><hr><font size=-2>Generated by Google Scholar Citation Explorer<pre>http://compbio.cs.uic.edu/~mayank/software/slh/</pre></font><p>";

	// sort all citations by number of intersections in common
	window.slh_temp_isect = new Object(); var clist = new Array();
	for(var r = 0; r < window.slh_ce_roots.length; r++)	{
		var root = window.slh_ce_roots[r];
		var cites = window.slh_ce_citations[root[0]];
		for(var c = 0; c < cites.length; c++)
			if(cites[c] in window.slh_temp_isect)
				window.slh_temp_isect[cites[c]].push(r);
			else	{
				window.slh_temp_isect[cites[c]] = new Array();
				window.slh_temp_isect[cites[c]].push(r);
				clist.push(cites[c]);
			}
	}
	clist.sort(slh_ce_print_sorter);

	// print citations
	ih += "<table border=0 cellpadding = '5px' cellspacing = '5px'><tr style='background-color: #d6e3ff'>";
	for(var r = 0; r < window.slh_ce_roots.length; r++)
		ih += '<td style="font-size: 28pt; font-weight: bold">'+(r+1)+'</td>';
	ih += '<td></td></tr>';
	for(var c = 0; c < clist.length; c++)	{
		var ct = clist[c];
		var citingdocs = window.slh_temp_isect[ct];
		ih += '<tr>';
		var at = 0;
		for(var d = 0; d < window.slh_ce_roots.length; d++)	{
			ih += '<td style="font-size: 28pt; font-weight: bold">';
			if(d > citingdocs[at])
				at++;
			else 
				if(d == citingdocs[at])	{
					at++;
					ih += 'X';
				}
			ih += '</td>';
		}
		ih += '<td>'+window.slh_ce_citetext[ct]+'</td>';

		ih += '</tr>';
	}


	ih += '</table>';
	window.slh_temp_isect = undefined;	// mark for garbage collection
	pwin.document.body.innerHTML += ih;
}

slh_main();