Implement double belt logic

game.js

@@ -70,6 +70,12 @@ var LEVEL3 = [
 	[{},{...WRITERDOWN},{},{},{},],
 	[{},{...BELTRIGHT},{},{},{},],
 	[{},{},{},{},{},],]
+var LEVEL4 = [
+	[{},{},{},{},{},],
+	[{},{},{},{},{},],
+	[{},{...BELTRIGHT,direction2:DOWN},{},{},{},],
+	[{},{},{...BELTUP,direction2:LEFT},{},{},],
+	[{},{},{},{},{},],]
 
 var gameGrid= []
 
@@ -92,10 +98,26 @@ function runBot(testing) {
 		//console.log("Update")
 		var nextSquare = {}
 		switch (BOT_DIR) {
-			case UP:{nextSquare = gameGrid[--BOT_Y][BOT_X];}break;
-			case LEFT:{nextSquare = gameGrid[BOT_Y][--BOT_X];}break;
-			case RIGHT:{nextSquare = gameGrid[BOT_Y][++BOT_X];}break;
-			case DOWN:{nextSquare = gameGrid[++BOT_Y][BOT_X];}break;
+			case UP:{
+				nextSquare = gameGrid[--BOT_Y][BOT_X];
+				BOT_DIR=(nextSquare.direction2 &&
+				(nextSquare.direction2===UP||nextSquare.direction2===DOWN))?nextSquare.direction2:nextSquare.direction
+			}break;
+			case LEFT:{
+				nextSquare = gameGrid[BOT_Y][--BOT_X];
+				BOT_DIR=(nextSquare.direction2 &&
+				(nextSquare.direction2===RIGHT||nextSquare.direction2===LEFT))?nextSquare.direction2:nextSquare.direction
+			}break;
+			case RIGHT:{
+				nextSquare = gameGrid[BOT_Y][++BOT_X];
+				BOT_DIR=(nextSquare.direction2 &&
+				(nextSquare.direction2===RIGHT||nextSquare.direction2===LEFT))?nextSquare.direction2:nextSquare.direction
+			}break;
+			case DOWN:{
+				nextSquare = gameGrid[++BOT_Y][BOT_X];
+				BOT_DIR=(nextSquare.direction2 &&
+				(nextSquare.direction2===UP||nextSquare.direction2===DOWN))?nextSquare.direction2:nextSquare.direction
+			}break;
 		}
 		if (nextSquare.direction!==undefined) {
 			switch (nextSquare.type) {
@@ -115,12 +137,13 @@ function runBot(testing) {
 					}
 				}break;
 				case "WRITER":{
-					AppendTape(nextSquare.color)
+					if (nextSquare.overwrite) {
+						OverwriteTape(nextSquare.color)
+					} else {
+						AppendTape(nextSquare.color)
+					}
 					BOT_DIR = nextSquare.direction
 				}break;
-				default:{
-					BOT_DIR = nextSquare.direction
-				}
 			}
 			//console.log("Direction is now "+BOT_DIR)
 		} else {
@@ -191,6 +214,9 @@ function ConsumeTape() {
 function AppendTape(col) {
 	BOT_TAPE.push({color:col})
 }
+function OverwriteTape(col) {
+	BOT_TAPE[0]={color:col}
+}
 
 function LeftOf(dir) {
 	return (dir+1)%4

game.test.js

@@ -170,6 +170,77 @@ function runTests() {
 			}
 		}(),true)
 	})
+	.it("Bot obeys writer tape rules - Has correct tape when overwriting",()=>{
+		expect(function(){
+			loadLevel(LEVEL3,0,1)
+			BOT_TAPE=[{color:BLUE},{color:RED}]
+			for (var i=0;i<2;i++) {runBot(true)}
+			if (BOT_TAPE.length===2&&BOT_TAPE[0].color===RED) {
+				return true
+			} else {
+				return false
+			}
+		}(),true)
+	})
+	.it("Bot goes forward if no color matched.",()=>{
+		expect(function(){
+			loadLevel(LEVEL2,0,2)
+			BOT_TAPE = [{color:YELLOW}]
+			for (var i=0;i<2;i++) {runBot(true)}
+			if (BOT_X===2&&BOT_Y===2) {
+				return true
+			} else {
+				return false
+			}
+		}(),true)
+	})
+	.it("Bot goes right when approaching a double belt (Left->Right) from the left",()=>{
+		expect(function(){
+			loadLevel(LEVEL4,0,2)
+			for (var i=0;i<2;i++) {runBot(true)}
+			if (BOT_X===2&&BOT_Y===2) {
+				return true
+			} else {
+				return false
+			}
+		}(),true)
+	})
+	.it("Bot goes down when approaching a double belt (Up->Down) from the top",()=>{
+		expect(function(){
+			loadLevel(LEVEL4,1,1)
+			BOT_DIR=DOWN
+			for (var i=0;i<2;i++) {runBot(true)}
+			if (BOT_X===1&&BOT_Y===3) {
+				return true
+			} else {
+				return false
+			}
+		}(),true)
+	})
+	.it("Bot goes right when approaching a double belt (Left->Right) from the Right",()=>{
+		expect(function(){
+			loadLevel(LEVEL4,2,2)
+			BOT_DIR=LEFT
+			for (var i=0;i<2;i++) {runBot(true)}
+			if (BOT_X===2&&BOT_Y===2) {
+				return true
+			} else {
+				return false
+			}
+		}(),true)
+	})
+	.it("Bot goes up when approaching a double belt (Down->Up) from the Bottom",()=>{
+		expect(function(){
+			loadLevel(LEVEL4,2,4)
+			BOT_DIR=UP
+			for (var i=0;i<2;i++) {runBot(true)}
+			if (BOT_X===2&&BOT_Y===2) {
+				return true
+			} else {
+				return false
+			}
+		}(),true)
+	})
 	
 	
 	console.log("==============")