/*
* LaTeX Editor - JavaScript to launch the CodeCogs Equation Editor 
* Copyright (C) 2009 William Bateman, 2008 Waipot Ngamsaad 

* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.

* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

// The following code was originally developed by Waipot Ngamsaad <waipot@ngamsaad.name> (Website: http://www.waipot.ngamsaad.name)
// It has been updated and adapted by Will Bateman for www.CodeCogs.com




function showGeoGebraWindow(html_code){
	var popup=window.open("geogebra_popup.html","", "location=1,status=1,scrollbars=1,width=900,height=700");
	var externalDoc=popup.document;
	//var str=html_code;
	 var str = html_code.replace(
	// Replace out the new line character.
	new RegExp( "<br />" ,"g"),"");
	externalDoc.write(str);	
	externalDoc.close();
	
}
function showLaTeXWindow(str){
		var popup=window.open("latex_popup.html","LaTeX reference", "location=1,status=1,scrollbars=1,width=500,height=200");
		var externalDoc=popup.document;
		externalDoc.write("<div align=\"center\" style=\"font: 18px;\">Matematički izraz koji promatrate dobije se kao:</div><br><br><div align=\"center\" style=\"border: #ff0000 solid 1px; font: 15px Courier; background-color: #ebeadd; height: auto;\">[tex]"+ str +"[/tex]</div>");
		externalDoc.close();
	}

function makeLink(latex_code) {
	var str = latex_code;
	//Clean code
	str.replace(/<br>/gi,"");
	str.replace(/<br \/>/gi,"");
	var parsed_str="";
	for(i=0;i<str.length;i++){
	   if(str[i]!="\\"){
	   	parsed_str+=str[i];
           }
	   else{
		parsed_str+="\\\\";	
	   }	
	}
	//Create img tag
	latex_img = "<a href=\"javascript:;\" onclick=\"showLaTeXWindow(\'"+ parsed_str +"\');\"><img src=\"http://latex.codecogs.com/gif.latex?"+ str +"\" title=\""+ str +"\" alt=\""+ str +"\" align=\"absmiddle\" border=\"0\" /></a>"; 
	return latex_img;

}

function renderTeX(tag) {
	var eqn = window.document.getElementsByTagName(tag);
	for (var i=0; i<eqn.length; i++) {
		if (eqn[i].getAttribute("lang") == "latex" || eqn[i].getAttribute("xml:lang") == "latex") { 
			if ( !eqn[i].innerHTML.match(/<img.*?>/i) )
				eqn[i].innerHTML = makeLink(eqn[i].innerHTML);
		} 
	}
}

function renderpre() { renderTeX("pre"); }
function rendercode() { renderTeX("code"); }

//Run
if (window.addEventListener)
{
  window.addEventListener("load", renderpre, false); 
  window.addEventListener("load", rendercode, false); 
}
else if (window.attachEvent)
{
	window.attachEvent("onload", renderpre); 
	window.attachEvent("onload", rendercode); 
}