simple js templater

templater.js

function render(template, kwargs){
    this.template = template
    this.kwargs = kwargs

    this.render_str = function(temp, kwargs){
        re = /{{(.*?)}}/g
        if(kwargs == undefined){kwargs=this.kwargs}
        return temp.replace(re, function(a,b){
            clean_key = b.trim();
            if(kwargs[clean_key]){
                return kwargs[clean_key]
            }
            else{
                return '';
            }
                });
    }

    this.render_cycle = function(temp){
        cre = /{%for (.*?) in (.*?)%}(.*?){%endfor%}/g
        kwargs = this.kwargs
        render_str = this.render_str
        return temp.replace(cre, function(a,localvar,c,cycle_str){
            var relocal = new RegExp("{{"+localvar+"\.(.*?)}}");
            obj = kwargs[c.trim()]
            buff = ''
            for(i in obj){
                cycle_str_part = cycle_str.replace(relocal, '{{$1}}'.trim())
                buff += render_str(cycle_str_part, obj[i])
            }
            return buff
        })
    }

    this.go = function(){
        return this.render_str(this.render_cycle(this.template))
    }

}