Method fork

src/main/java/fieldnashorn/Nashorn.java:235–249

(NashornExecution from, Map<String, Object> parameters)

		NashornExecution ex = new NashornExecution(this, next.first, next.second, b, en);
		ex.setTernSupport(ternSupport);

		return ex;
	}, (x) -> x);


	NashornExecution fork(NashornExecution from, Map<String, Object> parameters) {
		ScriptEngine se = factory.getScriptEngine("-scripting", "--language=es6");
		ScriptContext context = se.getContext();

		Bindings dest = from.context.getBindings(ScriptContext.GLOBAL_SCOPE);
		Bindings source = from.context.getBindings(ScriptContext.GLOBAL_SCOPE);

		dest.entrySet().forEach(e -> source.put(e.getKey(), e.getValue()));

		context.setAttribute("_", from.box, ScriptContext.ENGINE_SCOPE);
		from.box.find(Boxes.root, from.box.both()).findFirst().ifPresent(x -> context.setAttribute("__", x, ScriptContext.ENGINE_SCOPE));

		NashornExecution ex = new NashornExecution(this, from.box, from.property, context, se);