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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('@hapi/joi'); var hoek = require('@hapi/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) {

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// Looping here in stead of making coerce generic as object walk is unnecessary

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for (var key in attrs) { attrs[key] = coerce(attrs[key], key);

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}

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}

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if (!(name in currentObject)) { if (options.arrayNotation || options.forceArrays[name]) {

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currentObject[name] = [attrs]; } else { currentObject[name] = attrs; }

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} else if (!(currentObject[name] instanceof Array)) {

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// 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[textNodeName()] = (currentObject[textNodeName()] || '') + data;

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}

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function endElement(name) {

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if (currentObject[textNodeName()]) {

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if (options.trim) {

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currentObject[textNodeName()] = currentObject[textNodeName()].trim()

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}

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// node-expat already reverse sanitizes it whether we like it or not

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//if (options.sanitize) {

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// currentObject[textNodeName()] = sanitizer.sanitize(currentObject[textNodeName()], true);

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//}

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currentObject[textNodeName()] = coerce(currentObject[textNodeName()], name);

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}

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if (currentElementName !== name) {

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delete currentObject[textNodeName()];

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}

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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 ((textNodeName() in currentObject) && (Object.keys(currentObject).length == 1)) {

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if (ancestor[name] instanceof Array) {

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ancestor[name].push(ancestor[name].pop()[textNodeName()]);

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} else {

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ancestor[name] = currentObject[textNodeName()];

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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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function textNodeName() { return options.alternateTextNode ? typeof options.alternateTextNode === 'string' ? options.alternateTextNode : '_t' : '$t' }

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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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* - alternateTextNode (boolean OR string): * If false or not specified: default of $t is used * If true, whenever $t is returned as an end point, is is substituted with _t

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* it String, whenever $t is returned as an end point, is is substituted with the String value (care advised)

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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(false),

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

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arrayNotation: joi.alternatives([joi.boolean(), joi.array()]).default(false), alternateTextNode: [joi.boolean().default(false), joi.string().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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options.forceArrays = {};

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if (Array.isArray(options.arrayNotation)) {

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options.arrayNotation.forEach(function (i) {

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options.forceArrays[i] = true;

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}); options.arrayNotation = false; }

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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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};