microtemplating.js

// Simple JavaScript Templating
// John Resig - https://johnresig.com/ - MIT Licensed
(function(){
    var cache = {};
     
    this.tmpl = function tmpl(str, data){
      // Figure out if we're getting a template, or if we need to
      // load the template - and be sure to cache the result.
      var fn = !/\W/.test(str) ?
        cache[str] = cache[str] ||
          tmpl(document.getElementById(str).innerHTML) :
         
        // Generate a reusable function that will serve as a template
        // generator (and which will be cached).
        new Function("obj",
          "var p=[],print=function(){p.push.apply(p,arguments);};" +
           
          // Introduce the data as local variables using with(){}
          "with(obj){p.push('" +
           
          // Convert the template into pure JavaScript
          str
            .replace(/[\r\t\n]/g, " ")
            .split("<%").join("\t")
            .replace(/((^|%>)[^\t]*)'/g, "$1\r")
            .replace(/\t=(.*?)%>/g, "',$1,'")
            .split("\t").join("');")
            .split("%>").join("p.push('")
            .split("\r").join("\\'")
        + "');}return p.join('');");
       
      // Provide some basic currying to the user
      return data ? fn( data ) : fn;
    };
  })();