C# Online Compiler | .NET Fiddle

using System;
using System.Collections.Generic;
using System.Timers;

/**************************************

#FinalWorld

    -interface-

    start @(|>>|)
    stop @(|<<|)
    tick [source:Object elapsedEvent:ElapsedEventArgs]

    -machine-

    $Begin
        |>>|
            print("In the Beginning...")
            -> $Working ^

    $Working => $Default
        |>|
            startTimer(500)
            print("Hello World") ^
        |<|
            stopTimer()
            print("Done working") ^
        |tick|
            -> $Resting ^

    $Resting => $Default
        |>|
            startTimer(1000)
            print("I'm resting") ^
        |<|
            stopTimer()
            print("Done resting") ^
        |tick|
            -> $Working ^

    $Default
        |<<|
            -> $End ^

    $End
        |>|
            print("End of the World") ^

    -actions-

    print [msg:string]
    startTimer [interval:int]
    stopTimer  [interval:int]

    -domain-

    var timer:Timer = null

##

***************************************/

namespace HelloWorld
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.Out.Flush();
			Console.WriteLine("");
            var world = new FinalWorld();
            world.start();
			// try max at different values:
			var max = 1000000000;
			for (var i = 0; i < max; i++) {}
			world.stop();
        }
    }
}

public class FrameEvent {
 
	public FrameEvent(String Msg, Dictionary<String,object> Parameters) {
		this.Msg = Msg;
		this.Parameters = Parameters;
	}
	public String Msg;
	public Dictionary<String,Object> Parameters;
	public Object Return;
}


public partial class FinalWorld {
    
    public FinalWorld() {
        
        _state_ = _sBegin_;
    }
    
    //===================== Interface Block ===================//
    
    public void start() {
        FrameEvent e = new FrameEvent(">>",null);
        _state_(e);
    }
    
    public void stop() {
        FrameEvent e = new FrameEvent("<<",null);
        _state_(e);
    }
    
    public void tick(Object source,ElapsedEventArgs elapsedEvent) {
        Dictionary<String,object> parameters = new Dictionary<String,object>();
        parameters["source"] = source;

        parameters["elapsedEvent"] = elapsedEvent;

        FrameEvent e = new FrameEvent("tick",parameters);
        _state_(e);
    }
    
    
    //===================== Machine Block ===================//
    
    
    
    private void _sBegin_(FrameEvent e) {
        if (e.Msg.Equals(">>")) {
            print_do("In the Beginning...");
            _transition_(_sWorking_);
            return;
        }
    }
    
    private void _sWorking_(FrameEvent e) {
        if (e.Msg.Equals(">")) {
            startTimer_do(500);
            print_do("Hello World");
            return;
        }
        else if (e.Msg.Equals("<")) {
            stopTimer_do();
            print_do("Done working");
            return;
        }
        else if (e.Msg.Equals("tick")) {
            _transition_(_sResting_);
            return;
        }
        _sDefault_(e);
        
    }
    
    private void _sResting_(FrameEvent e) {
        if (e.Msg.Equals(">")) {
            startTimer_do(1000);
            print_do("I'm resting");
            return;
        }
        else if (e.Msg.Equals("<")) {
            stopTimer_do();
            print_do("Done resting");
            return;
        }
        else if (e.Msg.Equals("tick")) {
            _transition_(_sWorking_);
            return;
        }
        _sDefault_(e);
        
    }
    
    private void _sDefault_(FrameEvent e) {
        if (e.Msg.Equals("<<")) {
            _transition_(_sEnd_);
            return;
        }
    }
    
    private void _sEnd_(FrameEvent e) {
        if (e.Msg.Equals(">")) {
            print_do("End of the World");
            return;
        }
    }
    
    //===================== Actions Block ===================//
    
    public virtual void print_do(string msg) {
        Console.WriteLine(msg);
    }

	public virtual void startTimer_do(int interval) {
        timer = new System.Timers.Timer();
        timer.Interval = interval;
        timer.Elapsed += tick;
        timer.AutoReset = true;
        timer.Enabled = true;
    }

    public virtual void stopTimer_do() {
        timer.Stop();
        timer = null;
    }
    
    //===================== Domain Block ===================//
    
    
    Timer timer = null;
    
    //=========== Machinery and Mechanisms ===========//
    
    private delegate void FrameState(FrameEvent e);
    private FrameState _state_;
    
    
    private void _transition_(FrameState newState) {
        FrameEvent exitEvent = new FrameEvent("<",null);
        _state_(exitEvent);
        _state_ = newState;
        FrameEvent enterEvent = new FrameEvent(">",null);
        _state_(enterEvent);
    }
    
}

        Dictionary<String,object> parameters = new Dictionary<String,object>();
 
using System;
using System.Collections.Generic;
using System.Timers;
​
/**************************************
​
#FinalWorld
​
    -interface-
​
    start @(|>>|)
    stop @(|<<|)
    tick [source:Object elapsedEvent:ElapsedEventArgs]
​
    -machine-
​
    $Begin
        |>>|
            print("In the Beginning...")
            -> $Working ^
​
    $Working => $Default
        |>|
            startTimer(500)

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