Basic website based on the demo

src/routes/sverdle/game.ts

@@ -0,0 +1,75 @@
+import { allowed, words } from './words.server.ts';
+
+export class Game {
+	index: number;
+	guesses: string[];
+	answers: string[];
+	answer: string;
+
+	/**
+	 * Create a game object from the player's cookie, or initialise a new game
+	 */
+	constructor(serialized: string | undefined = undefined) {
+		if (serialized) {
+			const [index, guesses, answers] = serialized.split('-');
+
+			this.index = +index;
+			this.guesses = guesses ? guesses.split(' ') : [];
+			this.answers = answers ? answers.split(' ') : [];
+		} else {
+			this.index = Math.floor(Math.random() * words.length);
+			this.guesses = ['', '', '', '', '', ''];
+			this.answers = [];
+		}
+
+		this.answer = words[this.index];
+	}
+
+	/**
+	 * Update game state based on a guess of a five-letter word. Returns
+	 * true if the guess was valid, false otherwise
+	 */
+	enter(letters: string[]) {
+		const word = letters.join('');
+		const valid = allowed.has(word);
+
+		if (!valid) return false;
+
+		this.guesses[this.answers.length] = word;
+
+		const available = Array.from(this.answer);
+		const answer = Array(5).fill('_');
+
+		// first, find exact matches
+		for (let i = 0; i < 5; i += 1) {
+			if (letters[i] === available[i]) {
+				answer[i] = 'x';
+				available[i] = ' ';
+			}
+		}
+
+		// then find close matches (this has to happen
+		// in a second step, otherwise an early close
+		// match can prevent a later exact match)
+		for (let i = 0; i < 5; i += 1) {
+			if (answer[i] === '_') {
+				const index = available.indexOf(letters[i]);
+				if (index !== -1) {
+					answer[i] = 'c';
+					available[index] = ' ';
+				}
+			}
+		}
+
+		this.answers.push(answer.join(''));
+
+		return true;
+	}
+
+	/**
+	 * Serialize game state so it can be set as a cookie
+	 */
+	toString() {
+		return `${this.index}-${this.guesses.join(' ')}-${this.answers.join(' ')}`;
+	}
+}