64 lines
3.9 KiB
Python
64 lines
3.9 KiB
Python
import re
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from typing import Optional, Dict, Tuple, Any
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import textarena as ta
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# from textarena.envs.TicTacToe.renderer import create_board_str
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class TicTacToeEnv(ta.Env):
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def __init__(self):
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super().__init__()
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self.cell_mapping = {i * 3 + j: (i, j) for i in range(3) for j in range(3)}
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# def get_board_str(self): return create_board_str(board=self.state.game_state["board"])
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def _render_board(self): return "\n---+---+---\n".join("|".join(f" {self.state.game_state['board'][r][c]} " if self.state.game_state['board'][r][c] else f" {str(r * 3 + c)} " for c in range(3)) for r in range(3))
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def reset(self, num_players: int, seed: Optional[int]=None):
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self.state = ta.TwoPlayerState(num_players=num_players, seed=seed)
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self.state.reset(game_state={"board": [['' for _ in range(3)] for _ in range(3)]}, player_prompt_function=self._prompt)
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self._observer_current_state()
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def _prompt(self, player_id:int, game_state:Dict[str,Any])-> str:
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return (
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f"You are Player {player_id} in Tic Tac Toe.\n"
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"Your goal is to win three in a row (horizontally, vertically, or diagonally) on the board.\n"
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"On your turn, you should select the square number (0-8) you want to put your mark in next.\n"
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"For example, '[4]' places your mark in the center cell of the board.\n\n"
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f"As Player {player_id}, you will be '{'X' if player_id == 1 else 'O'}', "
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f"while your opponent is '{'O' if player_id == 1 else 'X'}'.\n"
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)
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def _observer_current_state(self):
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available_moves = [f"'[{str(r*3+c)}]'" for r in range(3) for c in range(3) if self.state.game_state["board"][r][c] == '']
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self.state.add_observation(message=f"Current Board:\n\n{self._render_board()}\n\nAvailable Moves: {', '.join(available_moves)}", observation_type=ta.ObservationType.GAME_BOARD)
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def step(self,action:str)->Tuple[bool,ta.Info]:
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self.current_player = 'X' if self.state.current_player_id == 1 else 'O'
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self.state.add_observation(from_id=self.state.current_player_id, message=action, observation_type=ta.ObservationType.PLAYER_ACTION)
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match = re.compile(r"\[\s*(\d+)\s*\]").search(action)
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if match is None: # Invalid format
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self.state.set_invalid_move(reason="The submitted move does not follow the correct format.")
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else:
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cell = int(match.group(1))
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if cell not in self.cell_mapping: # Ensure the cell is within 0–8
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self.state.set_invalid_move(reason=f"{cell}. Must be between 0 and 8.")
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else:
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row, col = self.cell_mapping[cell]
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if self.state.game_state["board"][row][col] == '':
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self.state.game_state["board"][row][col] = self.current_player # Make the move
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self.state.add_observation(message=f"Player {self.state.current_player_id} placed their symbol ({self.current_player}) in cell {cell}.", observation_type=ta.ObservationType.GAME_ACTION_DESCRIPTION)
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if self._check_winner(): # Check for winner or draw
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self.state.set_winner(player_id=self.state.current_player_id, reason=f"Player {self.state.current_player_id} has won!")
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elif all(cell != '' for row in self.state.game_state["board"] for cell in row):
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self.state.set_draw(reason="The game is a draw!")
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else:
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self.state.set_invalid_move(reason=f"cell {cell} is already occupied.")
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self._observer_current_state()
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return self.state.step()
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def _check_winner(self) -> bool:
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board = self.state.game_state["board"]
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for i in range(3):
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if (board[i][0] == board[i][1] == board[i][2] != '' or board[0][i] == board[1][i] == board[2][i] != ''): return True
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if (board[0][0] == board[1][1] == board[2][2] != '' or board[0][2] == board[1][1] == board[2][0] != ''): return True
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return False
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