Node.js xml to json parsers benchmark thingie

index.js

/*
 * Benchmarking xml to json parsers
 * @author Sander AKA Redsandro (http://www.Redsandro.com)
 */

var path		= require('path');
var util		= require('util');
var fs			= require('fs');
var q			= require('q');
    q.longStackSuppor	= true;

var xml2js		= require('xml2js');	// pure Javascript // 0.4.10
var xml2jsp		= new xml2js.Parser();

var xml2json		= require('xml2json');		// https://github.com/buglabs/node-xml2json // Fast! // 0.5.1

var x2je		= require('xml2js-expat');	// https://github.com/Poetro/node-xml2js-expat // Faster! // 0.2.2

var rapidx2j		= require('rapidx2j');		// https://github.com/damirn/rapidx2j // Fastest? // 0.0.8

var fileName		= 'huge.xml';

var pwd			= path.dirname(require.main.filename);
var file		= path.join(pwd, fileName);
var xml			= fs.readFileSync(file, 'utf8');

var timeMs;



q(true)

// Try xml2json 5 times...
.then(doXml2json)
.then(doXml2json)
.then(doXml2json)
.then(doXml2json)
.then(doXml2json)

// Try xml-expat 5 times...
.then(doExpat)
.then(doExpat)
.then(doExpat)
.then(doExpat)
.then(doExpat)

// Try rapidx2j 5 times...
.then(doRapid)
.then(doRapid)
.then(doRapid)
.then(doRapid)
.then(doRapid)


.then(function(json) {
	console.log('Done.');
	
	return;
})


.fail(function(e) {
	console.log('Failed with error. :(');
	console.log(e.stack);
})
.done();


function doExpat() {
	return q.nfcall(function(cb) {
		var json;
		
		var modName = 'xml2js-expat 0.2.2';
		console.time(modName);
		
		var parser = new x2je.Parser(function(result, error) {
			if (!error) {
				json = result;
				console.timeEnd(modName);
			}
			else {
				console.error(error);
			}
		});

		if (parser.parseString(xml)) {
			cb(null, json);
		} else {
		  cb(new Error(util.format('node-xml2js-expat: parse error: "%s"', parser.getError() )));
		}
	});	
}

function doRapid() {
	return q.nfcall(function(cb) {
		var json;	
		var modName = 'rapidx2j 0.0.9';
		
		//console.log(util.format('Trying %s...', modName));
		console.time(modName);
		
		try {
			json = rapidx2j.parse(xml);
			//console.log(json);
			console.timeEnd(modName);
			cb(null, json);
		}
		catch (e) {
			cb(e);
		}
	});	
}

function doXml2json() {
	return q.nfcall(function(cb) {
		var json;	
		var modName = 'xml2json 0.5.1';
		
		console.time(modName);
		
		try {
			json = xml2json.toJson(xml, {object: true});
			// console.log(JSON.stringify(json));
			console.timeEnd(modName);
			cb(null, json);
		}
		catch (e) {
			cb(e);
		}
	});	
}