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 get_text(self):
  21         return self.TEXT % self.data
  22
  23     def check_available(self, player):
  24         return player.bits.check_bits(self.required_bits)
  25
  26     def perform_action(self, board, location):
  27         raise NotImplementedError("TODO")
  28
  29     def check_and_clear_MSB(self, player):
  30         if player.bits.check_bit(BITS.MSB):
  31             player.bits.clear_bit(BITS.MSB)
  32             return True
  33         else:
  34             return False
  35
  36     def export(self):
  37         return {'required_bits': list(self.required_bits),
  38                 'data': self.data,
  39                 'action_class': self.__class__.__name__}
  40
  41
  42 class DoNothing(LocationAction):
  43     TEXT = "No effect."
  44
  45     def perform_action(self, board, location):
  46         pass
  47
  48
  49 class LoseHealthOrMSB(LocationAction):
  50     TEXT = "Lose health or MSB."
  51     USES_MSB = True
  52
  53     def perform_action(self, board, location):
  54         if not self.check_and_clear_MSB(board.player):
  55             board.lose_health()
  56
  57
  58 class SetBits(LocationAction):
  59     TEXT = "Set bits specified by this location."
  60
  61     def perform_action(self, board, location):
  62         board.player.bits.set_bits(location.bitwise_operand)
  63
  64
  65 class ToggleBits(LocationAction):
  66     TEXT = "Toggle bits specified by this location."
  67
  68     def perform_action(self, board, location):
  69         board.player.bits.toggle_bits(location.bitwise_operand)
  70
  71
  72 class LoseHealthOrMSBAndSetBits(LocationAction):
  73     TEXT = "Lose health or MSB, then set bits specified by this location."
  74     USES_MSB = True
  75
  76     def perform_action(self, board, location):
  77         if not self.check_and_clear_MSB(board.player):
  78             board.lose_health()
  79         board.player.bits.set_bits(location.bitwise_operand)
  80
  81
  82 class AcquireWinToken(LocationAction):
  83     TEXT = "Acquire a win token, then clear all high bits."
  84     USES_MSB = True
  85
  86     def perform_action(self, board, location):
  87         if self.check_and_clear_MSB(board.player):
  88             board.acquire_win_token()
  89             board.player.bits.clear_bits(set([
  90                 BITS.CYAN, BITS.MAGENTA, BITS.YELLOW,
  91             ]))
  92
  93
  94 class GainHealthAndClearBitsOrMSB(LocationAction):
  95     TEXT = "Gain health, then clear bits specified by this location or MSB."
  96     USES_MSB = True
  97
  98     def perform_action(self, board, location):
  99         board.gain_health()
 100         if not self.check_and_clear_MSB(board.player):
 101             board.player.bits.clear_bits(location.bitwise_operand)
 102
 103
 104 class ShiftLocations(LocationAction):
 105     TEXT = "Shift board locations %(direction)s."
 106
 107     def perform_action(self, board, location):
 108         board.shift_locations(self.data['direction'])