add engine

engine/engine.rs

@@ -0,0 +1,44 @@
+use crate::game;
+use crate::player;
+
+pub struct Engine {
+    players: Vec<player::PlayerConsole>,
+    turn: usize,
+    board: game::Board,
+}
+
+impl Engine {
+    pub fn new() -> Engine {
+        let p1 = player::PlayerConsole::new("P1", game::CELL_X);
+        let p2 = player::PlayerConsole::new("P2", game::CELL_O);
+
+        let board = game::Board::new();
+
+        Engine {
+            players: vec![p1, p2],
+            turn: 0,
+            board: board,
+        }
+    }
+
+    pub fn run(&mut self) -> Result<(), Box<dyn std::error::Error>> {
+        loop {
+            let m = self.players[self.turn].request_move(&self.board)?;
+
+            let ok = self.board.put(m);
+            if !ok {
+                continue;
+            }
+
+            let winner = self.board.has_winner();
+            if winner != game::CELL_EMPTY {
+                println!("the winner is {}", self.players[self.turn].name());
+                break;
+            }
+
+            self.turn = (self.turn + 1) % 2
+        }
+
+        Ok(())
+    }
+}