Codecup Box Javascript player for Caia (compatible with Node.js and d8)

player-template.js

#!/usr/bin/d8 --single-threaded

// d8 defines print() and printErr() which write to stdout and stderr.
// In Node.js, we can use console.log() and console.error() for this.
const print = globalThis.print || console.log;
const printErr = globalThis.printErr || console.error;

// Global player initialization
let myColor = undefined;
let firstMove = undefined;
let myTurn = false;
// TODO: other stuff to keep track of game state

function executeMove(move) {
  // TODO
}

function placeTile(tile) {
  // TODO
  return 'Fjv';
}

function processLine(line) {
  if (myColor === undefined) {
    myColor = Number(line);
    printErr('My secret color:', myColor);
  } else if (firstMove === undefined) {
    firstMove = line;
    printErr('First move:', firstMove);
    executeMove(firstMove);
  } else if (line === 'Start') {
    myTurn = true;
  } else if (myTurn) {
    printErr('Tile received:', line);
    print(placeTile(line));
    myTurn = false;
  } else {
    printErr("Opponent's move:", line);
    executeMove(line);
    myTurn = true;
  }
}

// Caia player identification:
//  - 'D' for a deterministic player
//  - 'R' for a random player
printErr('D', 'playername');

// Main loop. Reads lines until "Quit".
if (typeof readline === 'function') {
  // Running in d8
  for (let line; (line = readline()) !== 'Quit'; ) {
    processLine(line);
  }
} else {
  // Running in Node.js
  const readline = require('node:readline');
  const rl = readline.createInterface(process.stdin);
  rl.on('line', (line) => {
    if (line === 'Quit') {
      rl.close();
    } else {
      processLine(line);
    }
  });
}

player.bat

REM Uncomment one of these lines (updating the paths) to execute the player script:
REM @C:\dev\v8\v8\out\x64.release\d8.exe --single-threaded c:\dev\demo\player-hybrid.js
REM @C:\dev\node-v23.2.0-win-x64\node.exe c:\dev\demo\player-hybrid.js