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// no enums yet...  (bug #9)public goose class PathState{}public goose class Wall: PathState{}public goose class Clear: PathState{}public Wall wall = new Wall;public Clear clear = new Clear;public goose class TileState{}public goose class Unvisited: TileState{}public goose class Visited: TileState{}public Unvisited unvisited = new Unvisited;public Visited visited = new Visited;public goose class CardinalDirection{}public static CardinalDirection direction from code (int DirectionCode){	if(DirectionCode == 0){		return(north);	}else if(DirectionCode == 1){		return(east);	}else if(DirectionCode == 2){		return(south);	}else if(DirectionCode == 3){		return(west);	}else{		return(null);	}}public static CardinalDirection random direction{	return(direction from code rng.Next(0,4));}public goose class East: CardinalDirection{}public goose class North: CardinalDirection{}public goose class West: CardinalDirection{}public goose class South: CardinalDirection{}public East east = new East;public North north = new North;public West west = new West;public South south = new South;public Random rng = new Random;	public class Coordinate{	public int x;	public int y;	public bool this exists in (Map map){		if(x < 0 || map.Tiles.Count < x || map.Tiles.Count == x){			return(false);		}		if(y < 0 || map.Tiles[x].Count < y || map.Tiles[x].Count == y){			return(false);		}		return(true);	}	// Should be this methods so can do 'Coord move north' (bug #15)	public Coordinate move (CardinalDirection direction){return(null);}	public Coordinate move (North direction){		local Coordinate rtn = new Coordinate;		rtn.x = x;		rtn.y = y - 1;		return(rtn);	}	public Coordinate move (East direction){		local Coordinate rtn = new Coordinate;		rtn.x = x + 1;		rtn.y = y;		return(rtn);	}	public Coordinate move (South direction){		local Coordinate rtn = new Coordinate;		rtn.x = x;		rtn.y = y + 1;		return(rtn);	}	public Coordinate move (West direction){		local Coordinate rtn = new Coordinate;		rtn.x = x - 1;		rtn.y = y;		return(rtn);	}}public class Tile{	public PathState EastPath = wall;	public PathState SouthPath = wall;	public TileState Status = unvisited;}public class Map{	public int maxX;	public int maxY;	public List> Tiles = new List>;	public void Initialize(){		Tiles.Clear();		// no for loops yet... (bug #11)		local int x;		local int y;		do{			y = 0;			Tiles.Add(new List);			do{				Tiles[x].Add(new Tile);				y=y+1;			}while(y			x=x+1;		}while(x	}		}public static void display( Map TargetMaze ){	local int x;	local int y;	x = 0;	print "#";	do{		print "##";		x = x + 1;	}while(x	print " \r\n";	x = 0;	y = 0;	do{		print "#";		x = 0;		do{			print ".";			if( TargetMaze.Tiles[x][y].EastPath == wall ){				print "#";			}else{				print ".";			}			x = x + 1;		}while(x		print " \r\n";			x = 0;		print "#";		do{			if( TargetMaze.Tiles[x][y].SouthPath == wall ){				print "#";			}else{				print ".";			}			print "#";			x = x+1;		}while(x		print " \r\n";		y = y+1;	}while( y < TargetMaze.maxY );			}public static bool done in (Map workMap) at (Coordinate Cursor){	local Coordinate workCoordinate = new Coordinate;	workCoordinate = Cursor.move north;	if(workCoordinate exists in workMap && workMap.Tiles[workCoordinate.x][workCoordinate.y].Status == unvisited){		return(false);	}	workCoordinate = Cursor.move east;	if(workCoordinate exists in workMap && workMap.Tiles[workCoordinate.x][workCoordinate.y].Status == unvisited){		return(false);	}	workCoordinate = Cursor.move south;	if(workCoordinate exists in workMap && workMap.Tiles[workCoordinate.x][workCoordinate.y].Status == unvisited){		return(false);	}	workCoordinate = Cursor.move west;	if(workCoordinate exists in workMap && workMap.Tiles[workCoordinate.x][workCoordinate.y].Status == unvisited){		return(false);	}	return(true);}public static void MazeStep( Map workMap, Coordinate Cursor){	workMap.Tiles[Cursor.x][Cursor.y].Status = visited;	// Not declared in the while loop due to bug #14.	local CardinalDirection RandomDirection;	local Coordinate NewCursor;		while( !done in workMap at Cursor ){				do{			RandomDirection = random direction;			NewCursor = Cursor.move RandomDirection;		}while( !(NewCursor exists in workMap && 			workMap.Tiles[NewCursor.x][NewCursor.y].Status == unvisited));		if( RandomDirection == east ){			workMap.Tiles[Cursor.x][Cursor.y].EastPath = clear;		}else if(RandomDirection == south){			workMap.Tiles[Cursor.x][Cursor.y].SouthPath = clear;		}else if(RandomDirection == west){			workMap.Tiles[NewCursor.x][NewCursor.y].EastPath = clear;		}else if(RandomDirection == north){			workMap.Tiles[NewCursor.x][NewCursor.y].SouthPath = clear;		}else{			print "!!! Unknown random direction?!?";		}					MazeStep(workMap,NewCursor);	}}public static Map create (int xsize) by (int ysize) maze{	local Map rtn = new Map;	rtn.maxX = xsize;	rtn.maxY = ysize;	rtn.Initialize();	local Coordinate Cursor = new Coordinate;	Cursor.x = rng.Next(0,xsize);	Cursor.y = rng.Next(0,ysize);	MazeStep(rtn,Cursor);		return(rtn);}public static void main(){	display (create 40 by 40 maze);}