def play(self, player, old_pos, new_pos):
self.checkStatePlaying()
player_index = self.getPlayerIndex(player)
color = WHITE if player_index == 0 else BLACK
if self.next_turn != color:
raise ValueError(tr("It's not your turn."))
old_index = parsePieceIndex(old_pos)
new_index = parsePieceIndex(new_pos)
piece = self.board[old_index]
if not piece:
raise ValueError(tr("There is no piece at %s.") % old_pos)
moves = self.possibleMoves(old_index)
if new_index not in moves:
raise ValueError(tr("Invalid move: %s") % new_pos)
moved_piece = self.board[old_index]
if moved_piece.color != color:
raise ValueError(tr("You cannot move your opponent's pieces."))
taken = self.board[new_index]
self.board[old_index] = None
self.board[new_index] = moved_piece
self.notifyAll(u'chess_move',
player.identifier, old_pos, new_pos,
exclude=player)
if taken is not None:
self.notifyAll(u'chess_take', player.identifier,
new_pos, taken.export(), exclude=player)
if self.next_turn == WHITE:
self.next_turn = BLACK
else:
self.next_turn = WHITE
def getPossibleMoves(self, piece):
piece_index = parsePieceIndex(piece)
moves = self.possibleMoves(piece_index)
moves = [formatPieceIndex(move) for move in moves]
return Response(u'chess_possible_moves', moves)
