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         substitutions = self.data.copy()
  22         if 'direction' in self.data:
  23             substitutions['rowcol'] = {
  24                 'NORTH': 'column',
  25                 'SOUTH': 'column',
  26                 'EAST': 'row',
  27                 'WEST': 'row',
  28             }[self.data['direction']]
  29         return self.TEXT % substitutions
  30
  31     def check_available(self, player):
  32         return player.bits.check_bits(self.required_bits)
  33
  34     def perform_action(self, board, location):
  35         raise NotImplementedError("TODO")
  36
  37     def check_and_clear_MSB(self, player):
  38         if player.bits.check_bit(BITS.MSB):
  39             player.bits.clear_bit(BITS.MSB)
  40             return True
  41         else:
  42             return False
  43
  44     def export(self):
  45         return {'required_bits': list(self.required_bits),
  46                 'data': self.data,
  47                 'action_class': self.__class__.__name__}
  48
  49
  50 class DoNothing(LocationAction):
  51     TEXT = "No effect."
  52
  53     def perform_action(self, board, location):
  54         pass
  55
  56
  57 class LoseHealthOrMSB(LocationAction):
  58     TEXT = "Lose health or MSB."
  59     USES_MSB = True
  60
  61     def perform_action(self, board, location):
  62         if not self.check_and_clear_MSB(board.player):
  63             board.lose_health()
  64
  65
  66 class SetBits(LocationAction):
  67     TEXT = "Set bits specified by this location."
  68
  69     def perform_action(self, board, location):
  70         board.player.bits.set_bits(location.bitwise_operand)
  71
  72
  73 class ToggleBits(LocationAction):
  74     TEXT = "Toggle bits specified by this location."
  75
  76     def perform_action(self, board, location):
  77         board.player.bits.toggle_bits(location.bitwise_operand)
  78
  79
  80 class LoseHealthOrMSBAndSetBits(LocationAction):
  81     TEXT = "Lose health or MSB, then set bits specified by this location."
  82     USES_MSB = True
  83
  84     def perform_action(self, board, location):
  85         if not self.check_and_clear_MSB(board.player):
  86             board.lose_health()
  87         board.player.bits.set_bits(location.bitwise_operand)
  88
  89
  90 class AcquireWinToken(LocationAction):
  91     TEXT = "Acquire a win token, then clear all key bits."
  92
  93     def perform_action(self, board, location):
  94         board.acquire_win_token()
  95         board.player.bits.clear_bits(set([
  96             BITS.RED, BITS.GREEN, BITS.BLUE,
  97         ]))
  98
  99
 100 class GainHealthAndClearBitsOrMSB(LocationAction):
 101     TEXT = "Gain health, then clear bits specified by this location or MSB."
 102     USES_MSB = True
 103
 104     def perform_action(self, board, location):
 105         board.gain_health()
 106         if not self.check_and_clear_MSB(board.player):
 107             board.player.bits.clear_bits(location.bitwise_operand)
 108
 109
 110 class ShiftLocations(LocationAction):
 111     TEXT = "Shift current %(rowcol)s %(direction)s."
 112
 113     def perform_action(self, board, location):
 114         board.shift_locations(self.data['direction'])