module.exports = function toXml(json, xml) { var xml = xml || '';

if (json instanceof Buffer) { json = json.toString(); } var obj = null; if (typeof(json) == 'string') { try { obj = JSON.parse(json); } catch(e) { throw new Error("The JSON structure is invalid"); } } else { obj = json; } var keys = Object.keys(obj); var len = keys.length;

// First pass, extract strings only for (var i = 0; i < len; i++) {

var key = keys[i], value = obj[key], isArray = Array.isArray(value); if (typeof(obj[key]) == 'string' || isArray) { var it = isArray ? value : [value]; it.forEach(function(subVal) { if (typeof(subVal) != 'object') { if (key == '$t') { xml += subVal; } else { xml = xml.replace(/>$/, ''); xml += ' ' + key + '="' + subVal + '">'; } } })

} } // Second path, now handle sub-objects and arrays

for (var i = 0; i < len; i++) { var key = keys[i]; if (Array.isArray(obj[key])) { var elems = obj[key]; var l = elems.length; for (var j = 0; j < l; j++) {

var elem = elems[j]; if (typeof(elem) == 'object') { xml += '<' + key + '>'; xml = toXml(elem, xml); xml += '</' + key + '>'; }

} } else if (typeof(obj[key]) == 'object') { xml += '<' + key + '>';

xml = toXml(obj[key], xml);

xml += '</' + key + '>'; } } return xml; };