naja/actions.py

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