http://devel.actinium.org/js/template.js/

template.js

(function () {
    // escape function
    var escape = function (s) {
        return (s || '').toString()
            .replace(/&/g, '&')
            .replace(/</g, '&#60;')
            .replace(/>/g, '&#62;')
            .replace(/"/g, '&#34;')
            .replace(/'/g, '&#39;');
    };
    var base_source = 'var __output="",__escape=' + escape.toString() + ';';
    
    // internal cache
    var cache = {};
    
    // compiler
    var template = function (source, data) {
        // when argument[0] is DOM object, read content
        if (source.innerHTML) {
            source = source.innerHTML;
        }
        // or, stringify source
        else {
            source = source.toString();
        }
        
        // replace
        
        // check cache
        var ck = source;
        if (!cache[ck]) {
            // try to parse css selector
            try {
                source = document.querySelector(source).innerHTML;
            } catch (e) {
            }
            
            // compile
            // if template source contains syntax error, this line throws exception
            cache[ck] = new Function('data', base_source + source
                // constant string
                .replace(/(^|%>)([\s\S]*?)(<%|$)/g, function (m, a, b, c) {
                    return a + (b && b.length ? ('__output+="' + b.replace(/"/g, '\\"').replace(/(?:\r\n|\r|\n)/g, '\\n') + '";') : '') + c;
                })
                // <%= variable %>; escape print variables
                .replace(/<%=[\s\n\r]*([\s\S]*?)[\s\n\r]*%>/g, 'try{__output+=__escape($1);}catch(e){}')
                // <%- variable %>; non-escape print variables
                .replace(/<%-[\s\n\r]*([\s\S]*?)[\s\n\r]*%>/g, 'try{__output+=($1);}catch(e){}')
                // <% statement %>; raw javascript stamement
                .replace(/<%([\s\S]*?)%>/g, '$1;')
                // return
                + 'return __output;');
        }
        
        // finish; return compiled function or rendered result
        return data ? cache[ck](data) : cache[ck];
    };
    
    // export
    window.template = template;
})();
//(function(){var h=function(s){return(s||'').toString().replace(/&/g,'&#38;').replace(/</g,'&#60;').replace(/>/g,'&#62;').replace(/"/g,'&#34;').replace(/'/g,'&#39;')};var i='var __output="",__escape='+h.toString()+';';var j={};var k=function(d,f){if(d.innerHTML){d=d.innerHTML}else{d=d.toString()}var g=d;if(!j[g]){try{d=document.querySelector(d).innerHTML}catch(e){}j[g]=new Function('data',i+d.replace(/(^|%>)([\s\S]*?)(<%|$)/g,function(m,a,b,c){return a+(b&&b.length?('__output+="'+b.replace(/"/g,'\\"').replace(/(?:\r\n|\r|\n)/g,'\\n')+'";'):'')+c}).replace(/<%=[\s\n\r]*([\s\S]*?)[\s\n\r]*%>/g,'try{__output+=__escape($1);}catch(e){}').replace(/<%-[\s\n\r]*([\s\S]*?)[\s\n\r]*%>/g,'try{__output+=($1);}catch(e){}').replace(/<%([\s\S]*?)%>/g,'$1;')+'return __output;')}return f?j[g](f):j[g]};window.template=k})();