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var expat = require('node-expat');

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var sanitizer = require('./sanitize.js')

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var joi = require('joi'); var hoek = require('hoek');

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// This object will hold the final result.

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var obj = {};

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var currentObject = {};

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var ancestors = [];

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var currentElementName = null;

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var options = {}; //configuration options function startElement(name, attrs) {

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currentElementName = name;

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if(options.coerce) { // Looping here in stead of making coerce generic as object walk is unnecessary

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for(var key in attrs) {

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attrs[key] = coerce(attrs[key],key);

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}

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}

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if (! (name in currentObject)) {

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if(options.arrayNotation) { currentObject[name] = [attrs]; } else { currentObject[name] = attrs; }

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} else if (! (currentObject[name] instanceof Array)) { // Put the existing object in an array. var newArray = [currentObject[name]]; // Add the new object to the array. newArray.push(attrs); // Point to the new array. currentObject[name] = newArray; } else { // An array already exists, push the attributes on to it. currentObject[name].push(attrs); } // Store the current (old) parent. ancestors.push(currentObject); // We are now working with this object, so it becomes the current parent. if (currentObject[name] instanceof Array) { // If it is an array, get the last element of the array. currentObject = currentObject[name][currentObject[name].length - 1]; } else { // Otherwise, use the object itself. currentObject = currentObject[name]; } } function text(data) {

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currentObject['$t'] = (currentObject['$t'] || '') + data; }

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function endElement(name) { if (currentObject['$t']) { if (options.trim) { currentObject['$t'] = currentObject['$t'].trim() }

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if (options.sanitize) { currentObject['$t'] = sanitizer.sanitize(currentObject['$t']); }

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currentObject['$t'] = coerce(currentObject['$t'],name);

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}

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if (currentElementName !== name) {

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delete currentObject['$t']; }

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// This should check to make sure that the name we're ending

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// matches the name we started on. var ancestor = ancestors.pop(); if (!options.reversible) {

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if (('$t' in currentObject) && (Object.keys(currentObject).length == 1)) {

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if (ancestor[name] instanceof Array) { ancestor[name].push(ancestor[name].pop()['$t']); } else {

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ancestor[name] = currentObject['$t'];

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} } } currentObject = ancestor; }

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function coerce(value,key) {

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if (!options.coerce || value.trim() === '') {

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return value;

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}

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if (typeof options.coerce[key] === 'function') return options.coerce[key](value);

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var num = Number(value);

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if (!isNaN(num)) { return num; }

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var _value = value.toLowerCase();

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if (_value == 'true') {

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return true; }

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if (_value == 'false') {

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return false;

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}

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return value;

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}

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/** * Parses xml to json using node-expat. * @param {String|Buffer} xml The xml to be parsed to json. * @param {Object} _options An object with options provided by the user. * The available options are: * - object: If true, the parser returns a Javascript object instead of * a JSON string. * - reversible: If true, the parser generates a reversible JSON, mainly * characterized by the presence of the property $t. * - sanitize_values: If true, the parser escapes any element value in the xml * that has any of the following characters: <, >, (, ), #, #, &, ", '.

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*

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* @return {String|Object} A String or an Object with the JSON representation * of the XML. */

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module.exports = function(xml, _options) {

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_options = _options || {};

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var parser = new expat.Parser('UTF-8'); parser.on('startElement', startElement); parser.on('text', text); parser.on('endElement', endElement); obj = currentObject = {}; ancestors = [];

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currentElementName = null;

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var schema = { object: joi.boolean().default(false), reversible: joi.boolean().default(false),

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coerce: joi.alternatives([joi.boolean(), joi.object()]).default(true),

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sanitize: joi.boolean().default(true), trim: joi.boolean().default(true), arrayNotation: joi.boolean().default(false)

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};

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var validation = joi.validate(_options, schema); hoek.assert(validation.error === null, validation.error); options = validation.value;

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if (!parser.parse(xml)) { throw new Error('There are errors in your xml file: ' + parser.getError()); } if (options.object) { return obj; }

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var json = JSON.stringify(obj); //See: http://timelessrepo.com/json-isnt-a-javascript-subset json = json.replace(/\u2028/g, '\\u2028').replace(/\u2029/g, '\\u2029');

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return json;

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};