Enabling ES6?

[lukehutch]

Can this sandbox start Nashorn as follows?:

ScriptEngine engine = new NashornScriptEngineFactory().getScriptEngine("--language=es6");

And even if you can get an engine, how do you turn the engine into a sandbox, so you can call setMaxCPUTime etc.?

[mxro]

Thank you for your question!

Yes, that is supported, see example:

package delight.nashornsandbox;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.script.ScriptException;

import org.junit.Test;

import delight.nashornsandbox.exceptions.ScriptCPUAbuseException;

public class TestES6 {

	@Test
	public void test() throws ScriptCPUAbuseException, ScriptException {
		NashornSandbox sandbox = NashornSandboxes.create("--language=es6");
		sandbox.setMaxCPUTime(100);
		sandbox.setMaxMemory(1000 * 1000);
		ExecutorService executor = Executors.newSingleThreadExecutor();
		sandbox.setExecutor(executor);
		sandbox.eval("let greetUsers = (users) => {"+
  "  users.forEach((args) => {"+
    "  console.log(`Hello, ${args.name}! You are ${args.age} years old.`);"+
  "});"+
"};");

		sandbox.getExecutor().shutdown();

	}

}

Note that Nashorn does not support all ES6 features. Not sure where the latest documentation is, but this one gives some idea: https://openjdk.org/jeps/292

[lukehutch]

Thank you -- you should probably document this in the main README.md, it will be very commonly needed.

[mxro]

Great idea! I've added this into the polyfill PR as well, see here https://github.com/javadelight/delight-nashorn-sandbox/pull/167/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5

I thought easiest would just be to change the default in all the examples to es6 - given there should be little downside in using that, and should be easy enough to remove?