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/*
* LaTeX IT - JavaScript to Convert Latex within an HTML page into Equations
* 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/>.
*/
var LatexIT = {
mode : 'gif',
imgnum : 0,
isFirefox:false,
init : function() {
// We need to review the support for SVG. Latest released versions are not supporting this as they should
// if(document.implementation.hasFeature("http://www.w3.org/TR/SVG11/feature#BasicStructure", "1.1"))
// this.mode='svg';
// browser name
// svg support in FireFox is not allowing two images to occur currently on the same line.
var ua = navigator.userAgent.toLowerCase();
if(ua.indexOf("firefox")!=-1)
{
// this.isFirefox = true;
}
},
pre : function(txt) {
if ( !txt.match(/<img.*?>/i) )
{
//Clean code
txt=txt.replace(/<br>/mgi,"");
txt=txt.replace(/<br \/>/mgi,"");
//Create img tag
// txt = " <img src=\"http://latex.codecogs.com/"+this.mode+".latex?"+ txt +"\" /> ";
// txt = " <object type=\"image/svg+xml\" width=\"20\" data=\"http://latex.codecogs.com/"+this.mode+".latex?"+ txt +"\" /> ";
if(this.mode=='svg')
{
// Best for Firefox
if(this.isFirefox)
txt = " <object type=\"image/svg+xml\" data=\"http://latex.codecogs.com/"+this.mode+".latex?"+ txt +"\" class=\"latex\" style=\"margin:0; padding:0; border:0\" /> ";
else // Best for Chrome
// txt = " <object type=\"image/svg+xml\" data=\"http://latex.codecogs.com/"+this.mode+".latex?"+ txt +"\" class=\"latex\" /> ";
txt = " <img src=\"http://latex.codecogs.com/"+this.mode+".latex?"+ txt +"\" alt=\""+ txt +"\" title=\""+ txt +"\" border=\"0\" class=\"latex\" /> ";
}
else
txt = " <img src=\"http://latex.codecogs.com/"+this.mode+".latex?"+ txt +"\" alt=\""+txt+"\" border=\"0\" class=\"latex\" /> ";
}
return txt;
},
latex : function(txt) {
var html, htmlinline;
if(this.isFirefox) {
html=" <object type=\"image/svg+xml\" data=\"http://latex.codecogs.com/"+this.mode+".latex?$2\" class=\"latex\" /> ";
htmlinline=" <object type=\"image/svg+xml\" data=\"http://latex.codecogs.com/"+this.mode+".latex?\\inline $2\" class=\"latex\" /> ";
}
else {
html=" <img src=\"http://latex.codecogs.com/"+this.mode+".latex?$2\" border=\"0\" class=\"latex\" /> ";
htmlinline=" <img src=\"http://latex.codecogs.com/"+this.mode+".latex?\\inline $2\" border=\"0\" class=\"latex\" /> ";
}
txt=txt.replace(/(^\$|[^\\]\$)(.*?[^\\])\$/gm, htmlinline);
txt=txt.replace(/(^\\|[^\\]\\)\[(.*?[^\\])\\\]/mg," <br/>"+html+"<br/> ");
txt=txt.replace(/\\\$/mg,"\$");
txt=txt.replace(/\\\\(\[|\])/mg,"$1");
return txt;
},
render : function(tag, latexmode) {
var eqn = window.document.getElementsByTagName(tag);
for (var i=0; i<eqn.length; i++) {
if(latexmode)
eqn[i].innerHTML = LatexIT.latex(eqn[i].innerHTML);
else if (eqn[i].getAttribute("lang") == "latex" || eqn[i].getAttribute("xml:lang") == "latex")
eqn[i].innerHTML = LatexIT.pre(eqn[i].innerHTML);
}
},
add : function(tag, latexmode)
{
if(typeof(latexmode)=='undefined') latexmode=false;
if(window.addEventListener)
window.addEventListener('load', new Function('LatexIT.render("'+tag+'", '+latexmode+')'),false);
else
window.attachEvent('onload', new Function('LatexIT.render("'+tag+'", '+latexmode+')') );
},
scale : function(e,scale)
{
e.width =(e.width*scale);
e.height=(e.height*scale);
}
};
LatexIT.init();
LatexIT.add('*');
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