naja/actions.py

   1 from naja.constants import BITS
   2
   3
   4 class LocationAction(object):
   5     """
   6     An action that may be performed on a location.
   7     """
   8
   9     TEXT = None
  10     USES_MSB = False
  11
  12     def __init__(self, required_bits, **data):
  13         bits = set()
  14         for bit in required_bits:
  15             # Convert names to numbers if applicable.
  16             bits.add(BITS.get(bit, bit))
  17         self.required_bits = frozenset(bits)
  18         self.data = data
  19
  20     def check_available(self, player):
  21         return player.bits.check_bits(self.required_bits)
  22
  23     def perform_action(self, board, location):
  24         raise NotImplementedError("TODO")
  25
  26     def check_and_clear_MSB(self, player):
  27         if player.bits.check_bit(BITS.MSB):
  28             player.bits.clear_bit(BITS.MSB)
  29             return True
  30         else:
  31             return False
  32
  33     def export(self):
  34         return {'required_bits': list(self.required_bits),
  35                 'data': self.data,
  36                 'action_class': self.__class__.__name__}
  37
  38
  39 class DoNothing(LocationAction):
  40     TEXT = "No effect."
  41
  42     def perform_action(self, board, location):
  43         pass
  44
  45
  46 class LoseHealthOrMSB(LocationAction):
  47     TEXT = "Lose health or MSB."
  48     USES_MSB = True
  49
  50     def perform_action(self, board, location):
  51         if not self.check_and_clear_MSB(board.player):
  52             board.lose_health()
  53
  54
  55 class SetBits(LocationAction):
  56     TEXT = "Set bits specified by this location."
  57
  58     def perform_action(self, board, location):
  59         board.player.bits.set_bits(location.bitwise_operand)
  60
  61
  62 class ToggleBits(LocationAction):
  63     TEXT = "Toggle bits specified by this location."
  64
  65     def perform_action(self, board, location):
  66         board.player.bits.toggle_bits(location.bitwise_operand)
  67
  68
  69 class LoseHealthOrMSBAndSetBits(LocationAction):
  70     TEXT = "Lose health or MSB, then set bits specified by this location."
  71     USES_MSB = True
  72
  73     def perform_action(self, board, location):
  74         if not self.check_and_clear_MSB(board.player):
  75             board.lose_health()
  76         board.player.bits.set_bits(location.bitwise_operand)
  77
  78
  79 class AcquireWinToken(LocationAction):
  80     TEXT = "Acquire a win token, then clear all high bits."
  81     USES_MSB = True
  82
  83     def perform_action(self, board, location):
  84         if self.check_and_clear_MSB(board.player):
  85             board.acquire_win_token()
  86             board.player.bits.clear_bits(set([
  87                 BITS.CYAN, BITS.MAGENTA, BITS.YELLOW,
  88             ]))