Haxe roguelike autotiling example

autoTile.hx

public static function borderAutoTile(xt:Int, yt:Int, context:ITileable, cur:RLTile, values:BorderValues):Int
{
	var val:Int = 1;
	
	var u:RLTile = context.read(xt, yt - 1);
	var r:RLTile = context.read(xt + 1, yt);
	var d:RLTile = context.read(xt, yt + 1);
	var l:RLTile = context.read(xt - 1, yt);
	
	//check whether the surrounding tiles are walls.
	var UP:Bool = false;
	var RIGHT:Bool = false;
	var DOWN:Bool =	false;
	var LEFT:Bool = false;
	if(u != null) UP = 	u.rt == cur.rt;
	if(r != null) RIGHT =	r.rt == cur.rt;
	if(d != null) DOWN =	d.rt == cur.rt;
	if(l != null) LEFT = 	l.rt == cur.rt;

	//o = is a wall
	//x = no wall
	//e.g. oxox
	//up, !right, down, !left
	     if( UP && !RIGHT &&  DOWN && !LEFT) val = values.oxox;	// │	
	else if( UP && !RIGHT &&  DOWN &&  LEFT) val = values.oxoo;	// ┤
	else if(!UP && !RIGHT &&  DOWN &&  LEFT) val = values.xxoo;	// ┐
	else if( UP &&  RIGHT && !DOWN && !LEFT) val = values.ooxx;	// └
	else if( UP &&  RIGHT && !DOWN &&  LEFT) val = values.ooxo;	// ┴
	else if(!UP &&  RIGHT &&  DOWN &&  LEFT) val = values.xooo;	// ┬
	else if( UP &&  RIGHT &&  DOWN && !LEFT) val = values.ooox;	// ├
	else if(!UP &&  RIGHT && !DOWN &&  LEFT) val = values.xoxo;	// ─
	else if( UP &&  RIGHT &&  DOWN &&  LEFT) val = values.oooo;	// ┼
	else if( UP && !RIGHT && !DOWN &&  LEFT) val = values.oxxo;	// ┘
	else if(!UP &&  RIGHT &&  DOWN && !LEFT) val = values.xoox;	// ┌
	//special cases
	else if (UP || DOWN) 	val = values.oxox;
	else if (LEFT || RIGHT)	val = values.xoxo;
	else val = values.oxox;
	
	return val;
}