Abort execution

[daniel-schroeder-zeiss]

Hi,

is there a good way to abort script execution from within the executed script? I'm looking for a way to implement something similar to nodes process.exit(), but I do not want to kill my whole process but only the currently executing script.

[ClearScriptLib]

Hi @daniel-schroeder-zeiss,

One possibility is the Interrupt method. You might use it in an extension method like this:

public static class ScriptEngineExtensions {
    public static bool ExecuteWithExit(this ScriptEngine engine, string code) {
        engine.Script.exit = new Action(() => ScriptEngine.Current.Interrupt());
        try {
            engine.Execute(code);
            return true;
        }
        catch (ScriptInterruptedException) {
            return false;
        }
        finally {
            ((ScriptObject)engine.Script).DeleteProperty("exit");
        }
    }
}

And then:

engine.AddHostType(typeof(Console));
engine.ExecuteWithExit(@"
    Console.WriteLine('foo');
    exit();
    Console.WriteLine('bar'); // NOT REACHED
");

However, we can't guarantee that execution will always stop on the exact line of the exit call. In some script engines, the native interruption capability could be asynchronous.

Good luck!