naja/actions.py

   1 from naja.constants import BITS, CHESS_PIECES
   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
  19         if 'direction' in self.data:
  20             substitutions['rowcol'] = {
  21                 'NORTH': 'column',
  22                 'SOUTH': 'column',
  23                 'EAST': 'row',
  24                 'WEST': 'row',
  25             }[self.data['direction']]
  26
  27         if 'chesspiece' in self.data:
  28             substitutions['chesspiece_name'] = self.data['chesspiece'].lower()
  29
  30         return self.TEXT % substitutions
  31
  32     def check_available(self, player):
  33         return player.bits.check_bits(self.required_bits)
  34
  35     def perform_action(self, board, location):
  36         raise NotImplementedError(
  37             "%s does not implement perform_action()." % (type(self).__name__,))
  38
  39     def check_and_clear_MSB(self, player):
  40         if player.bits.check_bit(BITS.MSB):
  41             player.bits.clear_bit(BITS.MSB)
  42             return True
  43         else:
  44             return False
  45
  46     def export(self):
  47         return {'required_bits': list(self.required_bits),
  48                 'data': self.data,
  49                 'action_class': self.__class__.__name__}
  50
  51
  52 class DoNothing(LocationAction):
  53     TEXT = "No effect."
  54
  55     def perform_action(self, board, location):
  56         pass
  57
  58
  59 class LoseHealthOrMSB(LocationAction):
  60     TEXT = "Lose HEALTH or MSB."
  61     USES_MSB = True
  62
  63     def perform_action(self, board, location):
  64         if not self.check_and_clear_MSB(board.player):
  65             board.lose_health()
  66
  67
  68 class SetBits(LocationAction):
  69     TEXT = "Set bits specified by this location."
  70
  71     def perform_action(self, board, location):
  72         board.player.bits.set_bits(location.bitwise_operand)
  73
  74
  75 class ToggleBits(LocationAction):
  76     TEXT = "Toggle bits specified by this location."
  77
  78     def perform_action(self, board, location):
  79         board.player.bits.toggle_bits(location.bitwise_operand)
  80
  81
  82 class LoseHealthOrMSBAndSetBits(LocationAction):
  83     TEXT = "Lose HEALTH or MSB, then set bits specified by this location."
  84     USES_MSB = True
  85
  86     def perform_action(self, board, location):
  87         if not self.check_and_clear_MSB(board.player):
  88             board.lose_health()
  89         board.player.bits.set_bits(location.bitwise_operand)
  90
  91
  92 class AcquireWinToken(LocationAction):
  93     TEXT = "Acquire a win token, then clear all key bits."
  94
  95     def perform_action(self, board, location):
  96         board.acquire_win_token()
  97         board.player.bits.clear_bits(set([
  98             BITS.RED, BITS.GREEN, BITS.BLUE,
  99         ]))
 100
 101
 102 class GainHealthAndClearBitsOrMSB(LocationAction):
 103     TEXT = "Gain HEALTH, then clear bits specified by this location or MSB."
 104     USES_MSB = True
 105
 106     def perform_action(self, board, location):
 107         board.gain_health()
 108         if not self.check_and_clear_MSB(board.player):
 109             board.player.bits.clear_bits(location.bitwise_operand)
 110
 111
 112 class ShiftLocations(LocationAction):
 113     TEXT = "Shift current %(rowcol)s %(direction)s."
 114
 115     def perform_action(self, board, location):
 116         board.shift_locations(self.data['direction'])
 117
 118
 119 class AllowChessMove(LocationAction):
 120     TEXT = "Move like a %(chesspiece_name)s for one turn."
 121
 122     def perform_action(self, board, location):
 123         if self.data['chesspiece'] in CHESS_PIECES:
 124             chesspiece = CHESS_PIECES[self.data['chesspiece']]
 125             board.allow_chess_move(chesspiece)