JSweet HTTP Server

This project provides light HTTP server with a JSON Rest Web API to run the JSweet transpiler from any client, without having to install JSweet locally.

The server is built with NanoHttpd.

It comes also with a small JSweet client, which is the JSweet sandbox. You can try it live at http://www.jsweet.org/jsweet-live-sandbox/.

How to use

To transpile a file from Java to TypeScript or JavaScript, one must invoke the transpile Web Service on the JSweet server.

The JSweet team has a publicly available server at: http://sandbox.jsweet.org.

Here is a basic client written in JSweet:

import static jsweet.dom.Globals.console;
import jsweet.dom.FormData;
import jsweet.dom.XMLHttpRequest;
import jsweet.lang.JSON;
import jsweet.lang.Math;
import org.jsweet.JSweetServerTranspilationResponse;
[...]

public class JSweetClient {
	// use your own server if you need to
	static final String SERVER_URL = "http://sandbox.jsweet.org";
	public static void doInvoke() { 
		// the actual service invocation
		XMLHttpRequest currentRequest = new XMLHttpRequest();
		currentRequest.open("POST", SERVER_URL + "/transpile", true);
		currentRequest.onload = (e) -> {
			JSweetServerTranspilationResponse response = (JSweetServerTranspilationResponse) JSON
					.parse(currentRequest.responseText);
			if (response.success) {
				// JavaScript output
  				String jsContent = response.jsout;
				// TypeScript output
				String tsContent = response.tsout;
				// do whatever with the result
				[...]
			}
			return null;
		};
		currentRequest.onerror = (e) -> {
		  [...]
			return null;
		};
		FormData data = new FormData();
		// here the actual code to transpile
		data.append("javaCode", "public class C {}");
		// should be unique
		data.append("tid", "" + Math.random());
		// set to false if you only want the JavaScript output
		data.append("tsout", "true");
		try {
			currentRequest.send(data);
		} catch (Exception requestError) {
			console.error(requestError);
		}
	}
}

Build and run the server

Before compiling, you can edit the pom.xml to add dependencies to your server, so that your service can transpile code using any of the available candies listed here.

To compile the server, use Maven in the project's directory:

> mvn clean compile

To run the service under Unix-based OS (would need to be adapted for other OS):

> ./run.sh

NOTE: for the JSweet transpiler to work, you will need to make sure that Node.js is installed on the server. For more information, go to https://github.com/cincheo/jsweet.

Build and run the client

To compile the client, use Maven in the project's directory:

mvn -P client generate-sources

Start the client (will open www/index.html):

> firefox <SERVER_URL>