tictactoe: Use empty strings instead of null objects for empty squares

[empires-server] / tictactoe.js

diff --git a/tictactoe.js b/tictactoe.js
index 18fe3428806bee30c2c533182b15e02fee36993b..f9b357bf3202dfbc84443818dbd3626958e5f307 100644 (file)
--- a/tictactoe.js
+++ b/tictactoe.js
@@ -1,26 +1,67 @@
 const express = require("express");
-const cors = require("cors");
-const body_parser = require("body-parser");
-const path = require("path");
-const nunjucks = require("nunjucks");
-
-const app = express();
-app.use(cors());
-app.use(body_parser.urlencoded({ extended: false }));
-app.use(body_parser.json());
-
-nunjucks.configure("templates", {
-  autoescape: true,
-  express: app
+const Game = require("./game.js");
+
+const router = express.Router();
+
+class TicTacToe extends Game {
+  constructor(id) {
+    super(id);
+    this.moves = [];
+    this.board = Array(9).fill("");
+  }
+
+  /* Returns Boolean indicating whether move was legal and added. */
+  add_move(square) {
+    /* Cannot move to an occupied square. */
+    if (this.board[square])
+      return false;
+
+    this.board[square] = 'X';
+    this.moves.push(square);
+
+    return true;
+  }
+
+  broadcast_move(square) {
+    this.broadcast_event("move", square);
+  }
+
+  handle_events(request, response) {
+    super.handle_events(request, response);
+
+    /* When a new client joins, replay all previous moves to it. */
+    for (let move of this.moves) {
+      response.write(`event: move\ndata: ${move}\n\n`);
+    }
+  }
+}
+
+router.post('/move', (request, response) => {
+  const game = request.game;
+  const square = request.body.square;
+
+  const legal = game.add_move(square);
+
+  /* Inform this client whether the move was legal. */
+  response.send(JSON.stringify(legal));
+
+  /* And only if legal, inform all clients. */
+  if (! legal)
+    return;
+
+  game.broadcast_move(square);
 });
 
-app.get('/', (request, response) => {
+router.get('/events', (request, response) => {
   const game = request.game;
 
-  if (! request.session.nickname)
-    response.render('choose-nickname.html', { game_name: "Tic Tac Toe" });
-  else
-    response.render('tictactoe-game.html');
+  game.handle_events(request, response);
 });
 
-exports.app = app;
+exports.router = router;
+exports.Game = TicTacToe;
+
+TicTacToe.meta = {
+  name: "Tic Tac Toe",
+  identifier: "tictactoe"
+};