xml to object

/*
    convert xml or string to object
    2012.02.24
    by Anjey wu
*/
(function(){
        var xmlHelper = {tobject:tobject};
        function tobject(x){
            x = getType(x) === "xmldocument"? x:toxml(x);
            var n = x.documentElement;
            var o = xml2object(n, true);
            return o;
        }
        function toxml(s){
            if(s.indexOf("<?xml") != 0) s = '<?xml version="1.0" encoding="utf-8"?>' + s;
            var x = new DOMParser().parseFromString(s, "text/xml");
            return x;
        }
        function xml2object(n, de){
            if(!de && !n.length) return {};
            n = de? [n]:n;
            var o = {}, c = null;
            for(var i=0,l=n.length; i<l; i++){
                if(getType(n[i]) === "text"){
                    if(l == 1 && trim(n[0].nodeValue)) o.value = n[0].nodeValue;
                    continue;
                }
                c = mix(getAttr(n[i]), xml2object(n[i].childNodes));
                o[n[i].nodeName] = makeValue(o[n[i].nodeName], c);
            }
            return o?o:{};
        }
        function getAttr(node){
            var ob = {};
            for(var i = 0,n; n=node.attributes[i++];)
                ob[n.nodeName] = n.nodeValue;
            return ob;
        }
        function getType(o){
            return Object.prototype.toString.apply(o).match(/\w+/g)[1].toLowerCase();
        }
        function trim(s){
            return s.replace(/^\s+|\s+$/,"");
        }
        function makeValue(v1,v2){
            if(v1){
                if(getType(v1) === "array") v1.push(v2);
                else v1 = [v1,v2];
                return v1;
            }else return v2;
        }
        function mix(t, s){
                var a = [].slice.call(arguments),k,
                ride = getType(a[a.length - 1])==="boolean" ? a.pop() : true;
                t = t || {};
                for(var i = 1;s = a[i++];){
                    for (k in s) {
                        if (ride || !(k in t)) {
                            t[k] = s[k];
                        }
                    }
                }
                return t;
            } 

        window.xmlHelper = xmlHelper;
})();