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         self.required_bits = required_bits
  14         self.data = data
  15
  16     def get_text(self):
  17         substitutions = self.data.copy()
  18         if 'direction' in self.data:
  19             substitutions['rowcol'] = {
  20                 'NORTH': 'column',
  21                 'SOUTH': 'column',
  22                 'EAST': 'row',
  23                 'WEST': 'row',
  24             }[self.data['direction']]
  25         return self.TEXT % substitutions
  26
  27     def check_available(self, player):
  28         return player.bits.check_bits(self.required_bits)
  29
  30     def perform_action(self, board, location):
  31         raise NotImplementedError("TODO")
  32
  33     def check_and_clear_MSB(self, player):
  34         if player.bits.check_bit(BITS.MSB):
  35             player.bits.clear_bit(BITS.MSB)
  36             return True
  37         else:
  38             return False
  39
  40     def export(self):
  41         return {'required_bits': list(self.required_bits),
  42                 'data': self.data,
  43                 'action_class': self.__class__.__name__}
  44
  45
  46 class DoNothing(LocationAction):
  47     TEXT = "No effect."
  48
  49     def perform_action(self, board, location):
  50         pass
  51
  52
  53 class LoseHealthOrMSB(LocationAction):
  54     TEXT = "Lose health or MSB."
  55     USES_MSB = True
  56
  57     def perform_action(self, board, location):
  58         if not self.check_and_clear_MSB(board.player):
  59             board.lose_health()
  60
  61
  62 class SetBits(LocationAction):
  63     TEXT = "Set bits specified by this location."
  64
  65     def perform_action(self, board, location):
  66         board.player.bits.set_bits(location.bitwise_operand)
  67
  68
  69 class ToggleBits(LocationAction):
  70     TEXT = "Toggle bits specified by this location."
  71
  72     def perform_action(self, board, location):
  73         board.player.bits.toggle_bits(location.bitwise_operand)
  74
  75
  76 class LoseHealthOrMSBAndSetBits(LocationAction):
  77     TEXT = "Lose health or MSB, then set bits specified by this location."
  78     USES_MSB = True
  79
  80     def perform_action(self, board, location):
  81         if not self.check_and_clear_MSB(board.player):
  82             board.lose_health()
  83         board.player.bits.set_bits(location.bitwise_operand)
  84
  85
  86 class AcquireWinToken(LocationAction):
  87     TEXT = "Acquire a win token, then clear all key bits."
  88
  89     def perform_action(self, board, location):
  90         board.acquire_win_token()
  91         board.player.bits.clear_bits(set([
  92             BITS.RED, BITS.GREEN, BITS.BLUE,
  93         ]))
  94
  95
  96 class GainHealthAndClearBitsOrMSB(LocationAction):
  97     TEXT = "Gain health, then clear bits specified by this location or MSB."
  98     USES_MSB = True
  99
 100     def perform_action(self, board, location):
 101         board.gain_health()
 102         if not self.check_and_clear_MSB(board.player):
 103             board.player.bits.clear_bits(location.bitwise_operand)
 104
 105
 106 class ShiftLocations(LocationAction):
 107     TEXT = "Shift current %(rowcol)s %(direction)s."
 108
 109     def perform_action(self, board, location):
 110         board.shift_locations(self.data['direction'])