3 ## Copyright (C) 2004 NABEYA Kenichi (aka nanami@2ch)
4 ## Copyright (C) 2007-2008 Daigo Moriwaki (daigo at debian dot org)
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 2 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, write to the Free Software
18 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 require 'shogi_server/move'
22 module ShogiServer # for a namespace
24 class WrongMoves < ArgumentError; end
28 # Initial board setup.
29 # The string ends with '+', not a line break.
31 INITIAL_HIRATE_POSITION = (<<-EOF).chomp
32 P1-KY-KE-GI-KI-OU-KI-GI-KE-KY
33 P2 * -HI * * * * * -KA *
34 P3-FU-FU-FU-FU-FU-FU-FU-FU-FU
38 P7+FU+FU+FU+FU+FU+FU+FU+FU+FU
39 P8 * +KA * * * * * +HI *
40 P9+KY+KE+GI+KI+OU+KI+GI+KE+KY
44 # Split a moves line into an array of a move string.
45 # If it fails to parse the moves, it raises WrongMoves.
46 # @param moves a moves line. Ex. "+776FU-3334Fu"
47 # @return an array of a move string. Ex. ["+7776FU", "-3334FU"]
49 def Board.split_moves(moves)
52 rs = moves.gsub %r{[\+\-]\d{4}\w{2}} do |s|
56 raise WrongMoves, rs unless rs.empty?
62 def initialize(move_count=0)
63 @sente_hands = Array::new
64 @gote_hands = Array::new
65 @history = Hash::new(0)
66 @sente_history = Hash::new(0)
67 @gote_history = Hash::new(0)
68 @array = [[], [], [], [], [], [], [], [], [], []]
69 @move_count = move_count
70 @teban = nil # black => true, white => false
73 attr_accessor :array, :sente_hands, :gote_hands, :history, :sente_history, :gote_history, :teban
74 attr_reader :move_count
76 # Initial moves for a Buoy game. If it is an empty array, the game is
77 # normal with the initial setting; otherwise, the game is started after the
79 attr_reader :initial_moves
81 # See if self equals rhs, including a logical board position (i.e.
82 # not see object IDs) and sennichite stuff.
85 return @teban == rhs.teban &&
86 @move_count == rhs.move_count &&
88 @history == rhs.history &&
89 @sente_history == rhs.sente_history &&
90 @gote_history == rhs.gote_history &&
91 @initial_moves == rhs.initial_moves
95 return Marshal.load(Marshal.dump(self))
99 PieceKY::new(self, 1, 1, false)
100 PieceKE::new(self, 2, 1, false)
101 PieceGI::new(self, 3, 1, false)
102 PieceKI::new(self, 4, 1, false)
103 PieceOU::new(self, 5, 1, false)
104 PieceKI::new(self, 6, 1, false)
105 PieceGI::new(self, 7, 1, false)
106 PieceKE::new(self, 8, 1, false)
107 PieceKY::new(self, 9, 1, false)
108 PieceKA::new(self, 2, 2, false)
109 PieceHI::new(self, 8, 2, false)
111 PieceFU::new(self, i, 3, false)
114 PieceKY::new(self, 1, 9, true)
115 PieceKE::new(self, 2, 9, true)
116 PieceGI::new(self, 3, 9, true)
117 PieceKI::new(self, 4, 9, true)
118 PieceOU::new(self, 5, 9, true)
119 PieceKI::new(self, 6, 9, true)
120 PieceGI::new(self, 7, 9, true)
121 PieceKE::new(self, 8, 9, true)
122 PieceKY::new(self, 9, 9, true)
123 PieceKA::new(self, 8, 8, true)
124 PieceHI::new(self, 2, 8, true)
126 PieceFU::new(self, i, 7, true)
131 # Set up a board with the strs.
132 # Failing to parse the moves raises an StandardError.
133 # @param strs a board text
135 def set_from_str(strs)
136 strs.each_line do |str|
139 str.sub!(/^P(.)/, '')
142 while (str.length > 2)
143 str.sub!(/^(...?)/, '')
145 if (one =~ /^([\+\-])(..)/)
153 if ((x < 1) || (9 < x) || (y < 1) || (9 < y))
154 raise "bad position #{x} #{y}"
158 PieceFU::new(self, x, y, sente)
160 PieceKY::new(self, x, y, sente)
162 PieceKE::new(self, x, y, sente)
164 PieceGI::new(self, x, y, sente)
166 PieceKI::new(self, x, y, sente)
168 PieceOU::new(self, x, y, sente)
170 PieceKA::new(self, x, y, sente)
172 PieceHI::new(self, x, y, sente)
174 PieceFU::new(self, x, y, sente, true)
176 PieceKY::new(self, x, y, sente, true)
178 PieceKE::new(self, x, y, sente, true)
180 PieceGI::new(self, x, y, sente, true)
182 PieceKA::new(self, x, y, sente, true)
184 PieceHI::new(self, x, y, sente, true)
186 raise "unkown piece #{name}"
199 while (str.length > 3)
200 str.sub!(/^..(..)/, '')
204 PieceFU::new(self, 0, 0, sente)
206 PieceKY::new(self, 0, 0, sente)
208 PieceKE::new(self, 0, 0, sente)
210 PieceGI::new(self, 0, 0, sente)
212 PieceKI::new(self, 0, 0, sente)
214 PieceKA::new(self, 0, 0, sente)
216 PieceHI::new(self, 0, 0, sente)
218 raise "unkown piece #{name}"
226 raise "bad line: #{str}"
231 # Set up a board starting with a position after the moves.
232 # Failing to parse the moves raises an ArgumentError.
233 # @param moves an array of moves. ex. ["+7776FU", "-3334FU"]
235 def set_from_moves(moves)
237 return :normal if moves.empty?
240 rt = handle_one_move(move, @teban)
241 raise ArgumentError, "bad moves: #{moves}" unless rt == :normal
243 @initial_moves = moves.dup
246 def have_piece?(hands, name)
247 piece = hands.find { |i|
253 # :illegal and :outori do not change this instance (self).
256 x0, x1, y0, y1, name, sente = move.x0, move.x1, move.y0, move.y1, move.name, move.sente
264 piece = have_piece?(hands, name)
265 return :illegal if (piece == nil || ! piece.move_to?(x1, y1, name))
266 piece.move_to(x1, y1)
268 if (@array[x0][y0] == nil || !@array[x0][y0].move_to?(x1, y1, name))
271 if (@array[x1][y1] && @array[x1][y1].name == "OU")
275 # Change the state of this instance (self)
276 if (@array[x0][y0].name != name && !@array[x0][y0].promoted)
277 # the piece is promoting
278 @array[x0][y0].promoted = true
279 move.promotion = true
281 if (@array[x1][y1]) # capture
282 move.set_captured_piece(@array[x1][y1])
283 @array[x1][y1].sente = @array[x0][y0].sente
284 @array[x1][y1].move_to(0, 0)
285 hands.sort! {|a, b| # TODO refactor. Move to Piece class
289 @array[x0][y0].move_to(x1, y1)
292 @teban = @teban ? false : true
296 # Get back the previous move, which moved a name piece from [x0,y0] to
297 # [x1, y1] with or without promotion. If the move captured
298 # a piece, it is captured_piece, which is now in hand. The captured_piece
299 # was promoted or unpromoted.
308 piece = @array[move.x1][move.y1]
312 piece.move_to(move.x0, move.y0)
313 piece.promoted = false if piece.promoted && move.promotion
314 if move.captured_piece
315 move.captured_piece.move_to(move.x1, move.y1)
316 move.captured_piece.sente = move.sente ? false : true
317 move.captured_piece.promoted = true if move.captured_piece_promoted
322 @teban = @teban ? false : true
326 # def each_reserved_square
328 def look_for_ou(sente)
334 (@array[x][y].name == "OU") &&
335 (@array[x][y].sente == sente))
342 raise "can't find ou"
345 # See if sente is checked (i.e. loosing) or not.
346 # Note that the method name "checkmated?" is wrong. Instead, it should be
349 def checkmated?(sente)
350 ou = look_for_ou(sente)
356 (@array[x][y].sente != sente))
357 if (@array[x][y].movable_grids.include?([ou.x, ou.y]))
368 # See if sente's FU drop checkmates the opponent or not.
370 def uchifuzume?(sente)
371 rival_ou = look_for_ou(! sente) # rival's ou
372 if (sente) # rival is gote
373 if ((rival_ou.y != 9) &&
374 (@array[rival_ou.x][rival_ou.y + 1]) &&
375 (@array[rival_ou.x][rival_ou.y + 1].name == "FU") &&
376 (@array[rival_ou.x][rival_ou.y + 1].sente == sente)) # uchifu true
378 fu_y = rival_ou.y + 1
383 if ((rival_ou.y != 1) &&
384 (@array[rival_ou.x][rival_ou.y - 1]) &&
385 (@array[rival_ou.x][rival_ou.y - 1].name == "FU") &&
386 (@array[rival_ou.x][rival_ou.y - 1].sente == sente)) # uchifu true
388 fu_y = rival_ou.y - 1
394 ## case: rival_ou is moving
395 rival_ou.movable_grids.each do |(cand_x, cand_y)|
396 tmp_board = deep_copy
397 s = tmp_board.move_to(Move.new(rival_ou.x, rival_ou.y, cand_x, cand_y, "OU", ! sente))
398 raise "internal error" if (s != true)
399 if (! tmp_board.checkmated?(! sente)) # good move
404 ## case: rival is capturing fu
410 (@array[x][y].sente != sente) &&
411 @array[x][y].movable_grids.include?([fu_x, fu_y])) # capturable
414 if (@array[x][y].promoted)
415 names << @array[x][y].promoted_name
417 names << @array[x][y].name
418 if @array[x][y].promoted_name &&
419 @array[x][y].move_to?(fu_x, fu_y, @array[x][y].promoted_name)
420 names << @array[x][y].promoted_name
424 tmp_board = deep_copy
425 s = tmp_board.move_to(Move.new(x, y, fu_x, fu_y, name, ! sente))
429 tmp_board.checkmated?(! sente) # result
432 all_illegal = names.find {|a| a != :illegal}
433 raise "internal error: legal move not found" if all_illegal == nil
434 r = names.find {|a| a == false} # good move
435 return false if r == false # found good move
444 # @[sente|gote]_history has at least one item while the player is checking the other or
446 def update_sennichite(player)
449 if checkmated?(!player)
451 @sente_history["dummy"] = 1 # flag to see Sente player is checking Gote player
453 @gote_history["dummy"] = 1 # flag to see Gote player is checking Sente player
457 @sente_history.clear # no more continuous check
459 @gote_history.clear # no more continuous check
462 if @sente_history.size > 0 # possible for Sente's or Gote's turn
463 @sente_history[str] += 1
465 if @gote_history.size > 0 # possible for Sente's or Gote's turn
466 @gote_history[str] += 1
470 # Deep-copy sennichite stuff, which will later be available to restore.
472 def dup_sennichite_stuff
473 return [@history.dup, @sente_history.dup, @gote_history.dup]
476 # Restore sennihite stuff.
478 def restore_sennichite_stuff(history, sente_history, gote_history)
479 @history, @sente_history, @gote_history = history, sente_history, gote_history
482 def oute_sennichite?(player)
483 return nil unless sennichite?
487 if (@sente_history[to_s] >= 4) # sente is checking gote
488 return :oute_sennichite_sente_lose
489 elsif (@gote_history[to_s] >= 3) # sente is escaping
490 return :oute_sennichite_gote_lose
492 return nil # Not oute_sennichite, but sennichite
496 if (@gote_history[to_s] >= 4) # gote is checking sente
497 return :oute_sennichite_gote_lose
498 elsif (@sente_history[to_s] >= 3) # gote is escaping
499 return :oute_sennichite_sente_lose
501 return nil # Not oute_sennichite, but sennichite
507 if (@history[to_s] >= 4) # already 3 times
513 def good_kachi?(sente)
514 if (checkmated?(sente))
515 puts "'NG: Checkmating." if $DEBUG
519 ou = look_for_ou(sente)
520 if (sente && (ou.y >= 4))
521 puts "'NG: Black's OU does not enter yet." if $DEBUG
524 if (! sente && (ou.y <= 6))
525 puts "'NG: White's OU does not enter yet." if $DEBUG
543 (@array[x][y].sente == sente) &&
544 (@array[x][y].point > 0))
545 point = point + @array[x][y].point
551 hands.each do |piece|
552 point = point + piece.point
556 puts "'NG: Piece#[%d] is too small." % [number] if $DEBUG
561 puts "'NG: Black's point#[%d] is too small." % [point] if $DEBUG
566 puts "'NG: White's point#[%d] is too small." % [point] if $DEBUG
571 puts "'Good: Piece#[%d], Point[%d]." % [number, point] if $DEBUG
575 # sente is nil only if tests in test_board run
582 # - :oute_sennichite_sente_lose
583 # - :oute_sennichite_gote_lose
587 # - (:outori will not be returned)
589 def handle_one_move(str, sente=nil)
590 if (str =~ /^([\+\-])(\d)(\d)(\d)(\d)([A-Z]{2})/)
597 elsif (str =~ /^%KACHI/)
598 raise ArgumentError, "sente is null", caller if sente == nil
599 if (good_kachi?(sente))
604 elsif (str =~ /^%TORYO/)
610 if (((x0 == 0) || (y0 == 0)) && # source is not from hand
611 ((x0 != 0) || (y0 != 0)))
613 elsif ((x1 == 0) || (y1 == 0)) # destination is out of board
618 sente = true if sente == nil # deprecated
619 return :illegal unless sente == true # black player's move must be black
622 sente = false if sente == nil # deprecated
623 return :illegal unless sente == false # white player's move must be white
628 if ((x0 == 0) && (y0 == 0))
629 return :illegal if (! have_piece?(hands, name))
630 elsif (! @array[x0][y0])
631 return :illegal # no piece
632 elsif (@array[x0][y0].sente != sente)
633 return :illegal # this is not mine
634 elsif (@array[x0][y0].name != name)
635 return :illegal if (@array[x0][y0].promoted_name != name) # can't promote
639 if (@array[x1][y1] &&
640 (@array[x1][y1].sente == sente)) # can't capture mine
642 elsif ((x0 == 0) && (y0 == 0) && @array[x1][y1])
643 return :illegal # can't put on existing piece
646 move = Move.new(x0, y0, x1, y1, name, sente)
647 result = move_to(move)
648 if (result == :illegal)
652 if (checkmated?(sente))
654 return :oute_kaihimore
656 if ((x0 == 0) && (y0 == 0) && (name == "FU") && uchifuzume?(sente))
661 sennichite_stuff = dup_sennichite_stuff
662 update_sennichite(sente)
663 os_result = oute_sennichite?(sente)
664 if os_result # :oute_sennichite_sente_lose or :oute_sennichite_gote_lose
666 restore_sennichite_stuff(*sennichite_stuff)
671 restore_sennichite_stuff(*sennichite_stuff)
682 a.push(sprintf("P%d", y))
694 a.push(sprintf("\n"))
697 if (! sente_hands.empty?)
699 sente_hands.each do |p|
700 a.push("00" + p.name)
704 if (! gote_hands.empty?)
706 gote_hands.each do |p|
707 a.push("00" + p.name)
711 a.push("%s\n" % [@teban ? "+" : "-"])