Brainfuck Printer

(async function*(context: Context): Challenge {
	const evalBF = (bfCode:string):string => {
		const tape = new Array(0x8000).fill(0);
		let ptr = 0;
		let output = ``;
		for(let codeIdx = 0; codeIdx < bfCode.length; codeIdx++)
		{
			let command = bfCode.charAt(codeIdx);
			let jumpDirection = 0;
			if(command==`+`) tape[ptr]=(tape[ptr]+1)&255;
			if(command==`-`) tape[ptr]=(tape[ptr]-1)&255;
			if(command==`>`) ptr = ptr+1 & 0x7fff;
			if(command==`<`) ptr = ptr-1 & 0x7fff;
			if(command==`.`) output += String.fromCharCode(tape[ptr] & 0xff);
			if(command==`[` && !(tape[ptr]&0xff)) jumpDirection = 1;
			if(command==`]` &&  (tape[ptr]&0xff)) jumpDirection = -1;
			for(let balance = jumpDirection;balance;)
			{
			command = bfCode.charAt(codeIdx += jumpDirection);
			balance +=
				command==`[` ? 1 :
				command==`]` ? -1 : 0;
			}
		}
		return output;
	}

	let scores = [];

	const scoringTestCases = [
		"Hello, World!", 
		"Byte Heist is a site where you can test your coding skills by solving challenges in as few bytes as possible.",
		"The 8 valid brainfuck commands are: `+`,`-`,`>`,`<`,`[`,`]`,`.`, and `,`.",
		"How much wood would a wood chuck chuck is a wood chuck could chuck wood?",
		"Leentje leerde lotje lopen langs de lange linde laan, maar toen leentje niet wouw lopen leerde leentje lotje staan",
		"Ik ben ik. En dit is mijn vel. Past het wel? Het past. Wat zal ik er mee doen? Ik geef mijn vel een zoen",
		"Er was eens een bij uit 's-Gravenhage, die antwoord wist op alle vragen. Toen men hem moeiljk genoeg vroeg: \"Wat was was, eer was was was?\", werd hij de winnaar van de quiz, met \"Eer was was was, was was is\"",
		"Wij snachten naar achtentachtig prachtige nachten bij achtentachtig prachtige grachten",
		"Chandu ke chacha ne Chandu ki chachi ko Chandni Chowk mein chandi ke chammach se chatni chatai",
		"Kacha papita pital ki patili may pila pila"
	];

	const nonScoringTestCases = [
		"a",
		" !\"\#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
		"[>q1h`2@Xv 95Be:-Fsj73py(P!T Bayk{{Wpy|L|$ 7*kLwE|",
		"eL34NfeOL454KdeJ44JOdefePK55gQ67ShfTL787KegJ77JTeghfUK88iV9:XjgYL:;:KfiJ::JYfij",
		"J,xU #={lM#+[`iwt9cRxdz[ACiNRok~H\\6I[|72KHo]k IN9jsB:WtoUq3%c|r>:QAb\":>-hYH\" k",
		"i0sAVNQ Ik!EV5/E&^Ym_DJfyD<$/JkG,-kN,AQ=CT[K+L\"n^^z=",
		"&^5B5BF&6b%^7B&*N7H76n876 n907HM*M9[.)>][)>.0O[{>]>{I9.0,u-m8"
	];

	yield *context.runTestCases([
		...scoringTestCases,
		...nonScoringTestCases
	].map(s=>[s,s] as [string,string]), {
		  compareFunction: (output, expected) => {
			  let index;
			  if ((index = scoringTestCases.indexOf(expected))!=-1) {
				  delete scoringTestCases[index];
				  scores.push(output.length);
			  }
			  return evalBF(output) === expected
		  }
	});

	const textEncoder = new TextEncoder('utf-8');
	const lengthInBytes = (s: string): number => textEncoder.encode(s).length;


	// Finally, the challenge is passed if no test cases failed
	return context.noFailures(
		lengthInBytes(context.code) + Math.round(scores.reduce((a,b)=>a+b)/scores.length)
	);
})

input = require("fs").readFileSync(0) + "";
for (const line of input.split("\n")) {
  console.log(
    [...line].map(char => "[-]" + "+".repeat(char.charCodeAt(0)) + ".").join("")
  );
}