naja/actions.py

   1 from naja.constants import BITS, CHESS_PIECES
   2 from naja.utils import bit_glyphs
   3
   4
   5 class LocationAction(object):
   6     """
   7     An action that may be performed on a location.
   8     """
   9
  10     TEXT = None
  11     USES_MSB = False
  12
  13     def __init__(self, required_bits, **data):
  14         self.required_bits = required_bits
  15         self.data = data
  16
  17     def get_text(self, location=None):
  18         substitutions = self.data.copy()
  19
  20         if 'direction' in self.data:
  21             substitutions['rowcol'] = {
  22                 'NORTH': 'column',
  23                 'SOUTH': 'column',
  24                 'EAST': 'row',
  25                 'WEST': 'row',
  26             }[self.data['direction']]
  27
  28         if 'chesspiece' in self.data:
  29             substitutions['chesspiece_name'] = self.data['chesspiece'].lower()
  30
  31         if location is None:
  32             substitutions['location_bits'] = 'bits specified by this location'
  33         else:
  34             substitutions['location_bits'] = bit_glyphs(
  35                 location.bitwise_operand)
  36
  37         return self.TEXT % substitutions
  38
  39     def check_available(self, player):
  40         return player.bits.check_bits(self.required_bits)
  41
  42     def perform_action(self, board, location):
  43         raise NotImplementedError(
  44             "%s does not implement perform_action()." % (type(self).__name__,))
  45
  46     def check_and_clear_MSB(self, player):
  47         if player.bits.check_bit(BITS.MSB):
  48             player.bits.clear_bit(BITS.MSB)
  49             return True
  50         else:
  51             return False
  52
  53     def export(self):
  54         return {'required_bits': list(self.required_bits),
  55                 'data': self.data,
  56                 'action_class': self.__class__.__name__}
  57
  58
  59 class DoNothing(LocationAction):
  60     TEXT = "No effect."
  61
  62     def perform_action(self, board, location):
  63         pass
  64
  65
  66 class LoseHealthOrMSB(LocationAction):
  67     TEXT = "Lose HEALTH or MSB."
  68     USES_MSB = True
  69
  70     def perform_action(self, board, location):
  71         if not self.check_and_clear_MSB(board.player):
  72             board.lose_health()
  73
  74
  75 class SetBits(LocationAction):
  76     TEXT = "Set %(location_bits)s."
  77
  78     def perform_action(self, board, location):
  79         board.player.bits.set_bits(location.bitwise_operand)
  80
  81
  82 class ToggleBits(LocationAction):
  83     TEXT = "Toggle %(location_bits)s."
  84
  85     def perform_action(self, board, location):
  86         board.player.bits.toggle_bits(location.bitwise_operand)
  87
  88
  89 class LoseHealthOrMSBAndSetBits(LocationAction):
  90     TEXT = "Lose HEALTH or MSB, then set %(location_bits)s."
  91     USES_MSB = True
  92
  93     def perform_action(self, board, location):
  94         if not self.check_and_clear_MSB(board.player):
  95             board.lose_health()
  96         board.player.bits.set_bits(location.bitwise_operand)
  97
  98
  99 class AcquireWinToken(LocationAction):
 100     TEXT = "Gain WINTOKEN, then clear {RED,GREEN,BLUE}."
 101
 102     def perform_action(self, board, location):
 103         board.acquire_win_token()
 104         board.player.bits.clear_bits(set([
 105             BITS.RED, BITS.GREEN, BITS.BLUE,
 106         ]))
 107
 108
 109 class GainHealthAndClearBitsOrMSB(LocationAction):
 110     TEXT = "Gain HEALTH, then clear %(location_bits)s or MSB."
 111     USES_MSB = True
 112
 113     def perform_action(self, board, location):
 114         board.gain_health()
 115         if not self.check_and_clear_MSB(board.player):
 116             board.player.bits.clear_bits(location.bitwise_operand)
 117
 118
 119 class ShiftLocations(LocationAction):
 120     TEXT = "Shift current %(rowcol)s %(direction)s."
 121
 122     def perform_action(self, board, location):
 123         board.shift_locations(self.data['direction'])
 124
 125
 126 class AllowChessMove(LocationAction):
 127     TEXT = "Move like a %(chesspiece_name)s for one turn."
 128
 129     def perform_action(self, board, location):
 130         if self.data['chesspiece'] in CHESS_PIECES:
 131             chesspiece = CHESS_PIECES[self.data['chesspiece']]
 132             board.allow_chess_move(chesspiece)