## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+require 'shogi_server/move'
+
module ShogiServer # for a namespace
+class WrongMoves < ArgumentError; end
+
class Board
+
+ # Initial board setup.
+ # The string ends with '+', not a line break.
+ #
+ INITIAL_HIRATE_POSITION = (<<-EOF).chomp
+P1-KY-KE-GI-KI-OU-KI-GI-KE-KY
+P2 * -HI * * * * * -KA *
+P3-FU-FU-FU-FU-FU-FU-FU-FU-FU
+P4 * * * * * * * * *
+P5 * * * * * * * * *
+P6 * * * * * * * * *
+P7+FU+FU+FU+FU+FU+FU+FU+FU+FU
+P8 * +KA * * * * * +HI *
+P9+KY+KE+GI+KI+OU+KI+GI+KE+KY
++
+EOF
+
+ # Split a moves line into an array of a move string.
+ # If it fails to parse the moves, it raises WrongMoves.
+ # @param moves a moves line. Ex. "+776FU-3334Fu"
+ # @return an array of a move string. Ex. ["+7776FU", "-3334FU"]
+ #
+ def Board.split_moves(moves)
+ ret = []
+
+ rs = moves.gsub %r{[\+\-]\d{4}\w{2}} do |s|
+ ret << s
+ ""
+ end
+ raise WrongMoves, rs unless rs.empty?
+
+ return ret
+ end
+
def initialize(move_count=0)
@sente_hands = Array::new
# moves.
attr_reader :initial_moves
+ # See if self equals rhs, including a logical board position (i.e.
+ # not see object IDs) and sennichite stuff.
+ #
+ def ==(rhs)
+ return @teban == rhs.teban &&
+ @move_count == rhs.move_count &&
+ to_s == rhs.to_s &&
+ @history == rhs.history &&
+ @sente_history == rhs.sente_history &&
+ @gote_history == rhs.gote_history &&
+ @initial_moves == rhs.initial_moves
+ end
+
def deep_copy
return Marshal.load(Marshal.dump(self))
end
return piece
end
- def move_to(x0, y0, x1, y1, name, sente)
+ # :illegal and :outori do not change this instance (self).
+ #
+ def move_to(move)
+ x0, x1, y0, y1, name, sente = move.x0, move.x1, move.y0, move.y1, move.name, move.sente
if (sente)
hands = @sente_hands
else
hands = @gote_hands
end
- if ((x0 == 0) || (y0 == 0))
+ if move.is_drop?
piece = have_piece?(hands, name)
return :illegal if (piece == nil || ! piece.move_to?(x1, y1, name))
piece.move_to(x1, y1)
if (@array[x0][y0] == nil || !@array[x0][y0].move_to?(x1, y1, name))
return :illegal
end
- if (@array[x0][y0].name != name) # promoted ?
+ if (@array[x1][y1] && @array[x1][y1].name == "OU")
+ return :outori
+ end
+
+ # Change the state of this instance (self)
+ if (@array[x0][y0].name != name && !@array[x0][y0].promoted)
+ # the piece is promoting
@array[x0][y0].promoted = true
+ move.promotion = true
end
if (@array[x1][y1]) # capture
- if (@array[x1][y1].name == "OU")
- return :outori # return board update
- end
+ move.set_captured_piece(@array[x1][y1])
@array[x1][y1].sente = @array[x0][y0].sente
@array[x1][y1].move_to(0, 0)
hands.sort! {|a, b| # TODO refactor. Move to Piece class
return true
end
+ # Get back the previous move, which moved a name piece from [x0,y0] to
+ # [x1, y1] with or without promotion. If the move captured
+ # a piece, it is captured_piece, which is now in hand. The captured_piece
+ # was promoted or unpromoted.
+ #
+ def move_back(move)
+ if (move.sente)
+ hands = @sente_hands
+ else
+ hands = @gote_hands
+ end
+
+ piece = @array[move.x1][move.y1]
+ if move.is_drop?
+ piece.move_to(0, 0)
+ else
+ piece.move_to(move.x0, move.y0)
+ piece.promoted = false if piece.promoted && move.promotion
+ if move.captured_piece
+ move.captured_piece.move_to(move.x1, move.y1)
+ move.captured_piece.sente = move.sente ? false : true
+ move.captured_piece.promoted = true if move.captured_piece_promoted
+ end
+ end
+
+ @move_count -= 1
+ @teban = @teban ? false : true
+ return true
+ end
+
+ # def each_reserved_square
+
def look_for_ou(sente)
x = 1
while (x <= 9)
raise "can't find ou"
end
- # not checkmate, but check. sente is checked.
- def checkmated?(sente) # sente is loosing
+ # See if sente is checked (i.e. loosing) or not.
+ # Note that the method name "checkmated?" is wrong. Instead, it should be
+ # "checked?"
+ #
+ def checkmated?(sente)
ou = look_for_ou(sente)
x = 1
while (x <= 9)
return false
end
+ # See if sente's FU drop checkmates the opponent or not.
+ #
def uchifuzume?(sente)
rival_ou = look_for_ou(! sente) # rival's ou
if (sente) # rival is gote
## case: rival_ou is moving
rival_ou.movable_grids.each do |(cand_x, cand_y)|
tmp_board = deep_copy
- s = tmp_board.move_to(rival_ou.x, rival_ou.y, cand_x, cand_y, "OU", ! sente)
+ s = tmp_board.move_to(Move.new(rival_ou.x, rival_ou.y, cand_x, cand_y, "OU", ! sente))
raise "internal error" if (s != true)
if (! tmp_board.checkmated?(! sente)) # good move
return false
end
names.map! do |name|
tmp_board = deep_copy
- s = tmp_board.move_to(x, y, fu_x, fu_y, name, ! sente)
+ s = tmp_board.move_to(Move.new(x, y, fu_x, fu_y, name, ! sente))
if s == :illegal
s # result
else
end
end
+ # Deep-copy sennichite stuff, which will later be available to restore.
+ #
+ def dup_sennichite_stuff
+ return [@history.dup, @sente_history.dup, @gote_history.dup]
+ end
+
+ # Restore sennihite stuff.
+ #
+ def restore_sennichite_stuff(history, sente_history, gote_history)
+ @history, @sente_history, @gote_history = history, sente_history, gote_history
+ end
+
def oute_sennichite?(player)
return nil unless sennichite?
end
# sente is nil only if tests in test_board run
+ # @return
+ # - :normal
+ # - :toryo
+ # - :kachi_win
+ # - :kachi_lose
+ # - :sennichite
+ # - :oute_sennichite_sente_lose
+ # - :oute_sennichite_gote_lose
+ # - :illegal
+ # - :uchifuzume
+ # - :oute_kaihimore
+ # - (:outori will not be returned)
+ #
def handle_one_move(str, sente=nil)
if (str =~ /^([\+\-])(\d)(\d)(\d)(\d)([A-Z]{2})/)
sg = $1
return :illegal # can't put on existing piece
end
- tmp_board = deep_copy
- return :illegal if (tmp_board.move_to(x0, y0, x1, y1, name, sente) == :illegal)
- return :oute_kaihimore if (tmp_board.checkmated?(sente))
- tmp_board.update_sennichite(sente)
- os_result = tmp_board.oute_sennichite?(sente)
- return os_result if os_result # :oute_sennichite_sente_lose or :oute_sennichite_gote_lose
- return :sennichite if tmp_board.sennichite?
-
- if ((x0 == 0) && (y0 == 0) && (name == "FU") && tmp_board.uchifuzume?(sente))
+ move = Move.new(x0, y0, x1, y1, name, sente)
+ result = move_to(move)
+ if (result == :illegal)
+ # self is unchanged
+ return :illegal
+ end
+ if (checkmated?(sente))
+ move_back(move)
+ return :oute_kaihimore
+ end
+ if ((x0 == 0) && (y0 == 0) && (name == "FU") && uchifuzume?(sente))
+ move_back(move)
return :uchifuzume
end
- move_to(x0, y0, x1, y1, name, sente)
-
+ sennichite_stuff = dup_sennichite_stuff
update_sennichite(sente)
+ os_result = oute_sennichite?(sente)
+ if os_result # :oute_sennichite_sente_lose or :oute_sennichite_gote_lose
+ move_back(move)
+ restore_sennichite_stuff(*sennichite_stuff)
+ return os_result
+ end
+ if sennichite?
+ move_back(move)
+ restore_sennichite_stuff(*sennichite_stuff)
+ return :sennichite
+ end
+
return :normal
end
+ # Return a CSA-styled string notation of the current position.
+ #
def to_s
a = Array::new
y = 1
a.push("%s\n" % [@teban ? "+" : "-"])
return a.join
end
+
+ # Return a CSA-styled string notation of the initial position.
+ #
+ def initial_string
+ tmp_board = self.class.new
+ tmp_board.initial
+ return tmp_board.to_s
+ end
end
end # ShogiServer
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