/
server.js
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/
server.js
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/*jslint nomen: true */
var handlebars = require('handlebars'),
path = require('path'),
fs = require('fs'),
templateFor = function (name) { return handlebars.compile(fs.readFileSync(path.resolve(__dirname, name), 'utf8')); },
reader = function () {
var args = Array.prototype.slice.call(arguments),
file;
args.unshift(__dirname);
file = path.resolve.apply(null, args);
return fs.readFileSync(file, 'utf8');
},
esprimaSource = reader('..', '..', '..', 'node_modules', 'esprima', 'esprima.js'),
escodegenSource = reader('..', '..', '..', 'bower_components', 'escodegen', 'escodegen.browser.js'),
vm = require('vm'),
server;
function handleInitialPage(request, response) {
response.setHeader('content-type', 'text/html');
var template = templateFor('index.html');
response.end(template({ demo: server.demo ? 'yes' : '' }));
}
function handleEsprima(request, response) {
response.setHeader('content-type', 'application/javascript');
response.end(esprimaSource, 'utf8');
}
function handleEscodegen(request, response) {
response.setHeader('content-type', 'application/javascript');
response.end(escodegenSource, 'utf8');
}
function handleInstrumenter(request, response) {
response.setHeader('content-type', 'application/javascript');
var iPath = path.resolve(__dirname, '..', '..', '..', 'lib', 'instrumenter.js'),
instrumenterSource = fs.readFileSync(iPath, 'utf8');
if (server.instrumenter) {
response.end(server.instrumenter.instrumentSync(instrumenterSource, iPath), 'utf8');
} else {
response.end(instrumenterSource, 'utf8');
}
}
function handleFile(request, response) {
try {
var file = path.resolve(server.rootPath, request.url.substring(1)),
content;
content = fs.readFileSync(file, 'utf8');
response.setHeader('content-type', 'text/plain');
response.end(content, 'utf8');
} catch (ex) {
console.error(ex.message);
response.statusCode = 404;
response.end();
}
}
function getData(request, callback) {
var data = '';
request.setEncoding('utf8');
request.on('data', function (rdata) { data += rdata; });
request.on('end', function () {
callback(data);
});
}
function handleInstrumented(request, response) {
var script,
ok = true,
err = null;
getData(request, function (data) {
server.emit('instrumented', request.url.substring(1), data);
try {
script = vm.createScript(data, request.url);
} catch (ex) {
console.error('Invalid JS returned for:' + request.url);
ok = false;
err = ex.message || ex.toString();
}
response.setHeader('content-type', 'application/json');
response.end(JSON.stringify({ ok: ok, err: err }), 'utf8');
});
}
function handleEnd(request, response) {
var ok = true,
obj;
getData(request, function (data) {
try {
obj = JSON.parse(data);
} catch (ex) {
console.error(ex.message || ex);
console.error(ex.stack);
ok = false;
}
server.emit('done', obj);
response.end(JSON.stringify({ ok: ok }, 'utf8'));
});
}
function handler(request, response) {
console.log(request.method + ' ' + request.url);
if (request.method === 'GET') {
switch (request.url) {
case '/':
handleInitialPage(request, response);
break;
case '/_esprima.js':
handleEsprima(request, response);
break;
case '/_escodegen.js':
handleEscodegen(request, response);
break;
case '/_instrumenter.js':
handleInstrumenter(request, response);
break;
default:
handleFile(request, response);
break;
}
} else if (request.method === 'POST') {
switch (request.url) {
case '/':
handleEnd(request, response);
break;
default:
handleInstrumented(request, response);
break;
}
}
}
function create(port, instrumenter, root, demo) {
server = require('http').createServer(handler);
server.instrumenter = instrumenter;
server.rootPath = root;
server.listen(port);
server.demo = demo;
return server;
}
module.exports = {
create: create
};
if (module === require.main) {
(function () {
var port = process.argv[2] || 9000;
create(port, null, path.resolve(__dirname, '..', '..'), true);
console.log('Listening on http://localhost:' + port + '/');
}());
}