Use mem.eql for dictionary test

README.md

@@ -1,8 +1,6 @@
-# Demordle
+# Crowdle
 
-- TODO: come up with a better name.
-
-**Demordle** is *democratic wordle*. This is a nebulous premise with multiple interpretations; so instead of picking one, `demordle` implements them all!
+**Crowdle** is *democratic wordle*. This is a nebulous premise with multiple interpretations; so instead of picking one, `crowdle` implements them all!
 
 In all cases, "democratic" means _multiplayer cooperative_ where game actions are decided by vote. The players agree to play ahead of time and share a victory or loss. We also specifically mean _direct_ democracy where every player has equal representation in the voting process.[^representative]
 

src/dict.zig

@@ -62,18 +62,8 @@ fn loadDict() []const Wordle.Word {
 // TODO: binary search? need to assert that words are sorted
 pub fn isInDictionary(word: Wordle.Word) bool {
     // exhaustively search through dictionary
-    for (getDictionary()) |entry| {
-        // compare each letter at a time
-        var match = true;
-        for (entry, word) |entryLetter, wordLetter| {
-            if (entryLetter != wordLetter) {
-                match = false;
-                break;
-            }
-        }
-
-        // if every letter matches, return a complete match
-        if (match) {
+    for (getDictionary()) |*entry| {
+        if (std.mem.eql(u8, entry, &word)) {
             return true;
         }
     }
@@ -93,7 +83,7 @@ fn expectNotDictionary(word: Wordle.WordLiteral) !void {
 }
 
 test "in dictionary" {
-    try expectDictionary("abash");
+    try expectDictionary("aback");
 }
 
 test "not in dictionary" {

src/main.zig

@@ -1,5 +1,86 @@
 const std = @import("std");
+const Wordle = @import("wordle.zig");
+const Dict = @import("dict.zig");
 
-pub fn main() void {
-    std.debug.print("Hello, {s}!\n", .{"World"});
+pub fn main() !void {
+    // acquire stdout writer
+    var stdoutBuf: [1024]u8 = undefined;
+    var stdoutFile = std.fs.File.stdout().writer(&stdoutBuf);
+    if (stdoutFile.err) |err| return err;
+    const stdout = &stdoutFile.interface;
+
+    // acquire stdin reader
+    var stdinBuf: [1024]u8 = undefined;
+    var stdinFile = std.fs.File.stdin().reader(&stdinBuf);
+    if (stdinFile.err) |err| return err;
+    const stdin = &stdinFile.interface;
+
+    // select a random dictionary word as the solution
+    const dict = Dict.getDictionary();
+    const solutionIdx = std.crypto.random.intRangeAtMost(usize, 0, dict.len);
+
+    // create a game with the chosen solution
+    var game: Wordle.Game = .{ .solution = dict[solutionIdx] };
+
+    // play game until over
+    while (!game.isOver()) {
+        // display guess prompt
+        try stdout.writeAll("Guess: ");
+        try stdout.flush();
+
+        // read next guess
+        const input = try stdin.takeDelimiter('\n') orelse continue;
+
+        // assert that input is correct size
+        if (input.len != Wordle.WordLen) {
+            try stdout.writeAll("Guess is wrong length.\n");
+            try stdout.flush();
+            continue;
+        }
+
+        // convert to word
+        var guess: Wordle.Word = undefined;
+        @memcpy(&guess, input);
+
+        // test if guess is valid
+        if (!Dict.isInDictionary(guess)) {
+            try stdout.writeAll("Guess is not in dictionary.\n");
+            try stdout.flush();
+            continue;
+        }
+
+        // display clues
+        const clues = Wordle.checkGuess(guess, game.solution);
+        try writeClues(stdout, clues);
+
+        // add guess
+        try game.addGuess(guess);
+    }
+
+    // display message win/lose
+    if (game.isWon()) {
+        try stdout.writeAll("You win!\n");
+    } else {
+        try stdout.writeAll("You lose :(\n");
+    }
+
+    // display spoilered guesses
+    for (game.guesses()) |guess| {
+        try writeClues(stdout, Wordle.checkGuess(guess, game.solution));
+    }
+
+    // flush stdout
+    try stdout.flush();
+}
+
+pub fn writeClues(out: *std.io.Writer, clues: Wordle.Clues) !void {
+    for (clues) |clue| {
+        try out.writeAll(switch (clue) {
+            Wordle.Clue.Gray => "⬛",
+            Wordle.Clue.Yellow => "🟨",
+            Wordle.Clue.Green => "🟩",
+        });
+    }
+
+    try out.writeAll("\n");
 }

src/wordle.zig

@@ -9,6 +9,51 @@ pub const Word = [WordLen]u8;
 /// The type of string literals representing words.
 pub const WordLiteral = *const [WordLen:0]u8;
 
+/// The number of rounds in a single Wordle game.
+pub const GameLen = 6;
+
+/// An error reported when a move cannot be played since the game is over.
+pub const GameOver = error{GameOver};
+
+/// A structure for a single Wordle game.
+pub const Game = struct {
+    /// The hidden word to guess.
+    solution: Word,
+
+    /// The round number (starts with 0).
+    round: u32 = 0,
+
+    /// The current (and future) word guesses.
+    ///
+    /// The values of guessBuf[self.round..] are undefined.
+    guessBuf: [GameLen]Word = @splat(@splat(0)),
+
+    /// Fetches the current guesses.
+    pub fn guesses(self: *const Game) []const Word {
+        return self.guessBuf[0..self.round];
+    }
+
+    /// Tests if the game is won.
+    pub fn isWon(self: Game) bool {
+        for (self.guesses()) |guess|
+            if (std.mem.eql(u8, &guess, &self.solution)) return true;
+
+        return false;
+    }
+
+    /// Tests if the game is over.
+    pub fn isOver(self: Game) bool {
+        return self.round >= GameLen or self.isWon();
+    }
+
+    /// Guesses a word unless the game is over.
+    pub fn addGuess(self: *Game, guess: Word) GameOver!void {
+        if (self.isOver()) return error.GameOver;
+        self.guessBuf[self.round] = guess;
+        self.round += 1;
+    }
+};
+
 /// A clue for a spot given a guess.
 pub const Clue = enum {
     Gray,
@@ -98,3 +143,20 @@ test "anagram" {
 test "duplicate letters" {
     try expectGuessClues("fuzzy", "zesty", "  Y G");
 }
+
+test "game" {
+    // default state
+    var game: Game = .{ .solution = strToWord("poise") };
+    try std.testing.expect(!game.isWon());
+    try std.testing.expect(!game.isOver());
+
+    // first guess
+    try game.addGuess(strToWord("brown"));
+    try std.testing.expect(!game.isWon());
+    try std.testing.expect(!game.isOver());
+
+    // second guess
+    try game.addGuess(strToWord("poise"));
+    try std.testing.expect(game.isWon());
+    try std.testing.expect(game.isOver());
+}