JSR 223 - Scripting support for Frege

FregeScriptEngineTest.java

package helloworld;

import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class FregeScriptEngineTest {

	public static void main(final String[] args) throws Exception {
		//Get the Frege Script Engine
		final ScriptEngineManager factory = new ScriptEngineManager();
		final ScriptEngine engine = factory.getEngineByName("frege");

		//Evaluate an expression
		System.out.println(engine.eval("show $ take 10 [2,4..]"));

		//Pass some objects from host to scripting environment
		engine.put("foo::String", "Foo");
		engine.put("bar::Integer", new java.math.BigInteger("12234234232322"));

		//Use the objects from host environment
		System.out.println(engine.eval("\"Hello World, \" ++ foo"));
		System.out.println(engine.eval("bar + big 5"));

		/*
		 * Frege Script Engine is `Compilable` too. So scripts can be compiled and
		 * then executed later.
		 */
		final Compilable compilableEngine = (Compilable) engine;
		final CompiledScript compiled =
			compilableEngine.compile("fib = 0 : 1 : zipWith (+) fib fib.tail");
		compiled.eval(); //Evaluate the compiled script
		System.out.println(engine.eval("show $ take 6 fib")); //use compiled script
	}

}