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" or
47 # moves with times. Ex "+776FU,T2-3334FU,T5"
48 # @return an array of a move string. Ex. ["+7776FU", "-3334FU"] or
49 # an array of arrays. Ex. [["+7776FU","T2"], ["-3334FU", "T5"]]
51 def Board.split_moves(moves)
57 if moves[i,1] == "+" ||
60 if i == moves.size - 1
66 raise WrongMoves, a[0]
68 if a.size == 1 # "+7776FU"
71 unless /^T\d+/ =~ a[1]
72 raise WrongMoves, a[1]
87 def initialize(move_count=0)
88 @sente_hands = Array::new
89 @gote_hands = Array::new
90 @history = Hash::new(0)
91 @sente_history = Hash::new(0)
92 @gote_history = Hash::new(0)
93 @array = [[], [], [], [], [], [], [], [], [], []]
94 @move_count = move_count
95 @teban = nil # black => true, white => false
98 attr_accessor :array, :sente_hands, :gote_hands, :history, :sente_history, :gote_history, :teban
99 attr_reader :move_count
101 # Initial moves for a Buoy game. If it is an empty array, the game is
102 # normal with the initial setting; otherwise, the game is started after the
104 attr_reader :initial_moves
106 # See if self equals rhs, including a logical board position (i.e.
107 # not see object IDs) and sennichite stuff.
110 return @teban == rhs.teban &&
111 @move_count == rhs.move_count &&
113 @history == rhs.history &&
114 @sente_history == rhs.sente_history &&
115 @gote_history == rhs.gote_history &&
116 @initial_moves == rhs.initial_moves
120 return Marshal.load(Marshal.dump(self))
124 PieceKY::new(self, 1, 1, false)
125 PieceKE::new(self, 2, 1, false)
126 PieceGI::new(self, 3, 1, false)
127 PieceKI::new(self, 4, 1, false)
128 PieceOU::new(self, 5, 1, false)
129 PieceKI::new(self, 6, 1, false)
130 PieceGI::new(self, 7, 1, false)
131 PieceKE::new(self, 8, 1, false)
132 PieceKY::new(self, 9, 1, false)
133 PieceKA::new(self, 2, 2, false)
134 PieceHI::new(self, 8, 2, false)
136 PieceFU::new(self, i, 3, false)
139 PieceKY::new(self, 1, 9, true)
140 PieceKE::new(self, 2, 9, true)
141 PieceGI::new(self, 3, 9, true)
142 PieceKI::new(self, 4, 9, true)
143 PieceOU::new(self, 5, 9, true)
144 PieceKI::new(self, 6, 9, true)
145 PieceGI::new(self, 7, 9, true)
146 PieceKE::new(self, 8, 9, true)
147 PieceKY::new(self, 9, 9, true)
148 PieceKA::new(self, 8, 8, true)
149 PieceHI::new(self, 2, 8, true)
151 PieceFU::new(self, i, 7, true)
156 # Set up a board with the strs.
157 # Failing to parse the moves raises an StandardError.
158 # @param strs a board text
160 def set_from_str(strs)
161 strs.each_line do |str|
164 str.sub!(/^P(.)/, '')
167 while (str.length > 2)
168 str.sub!(/^(...?)/, '')
170 if (one =~ /^([\+\-])(..)/)
178 if ((x < 1) || (9 < x) || (y < 1) || (9 < y))
179 raise "bad position #{x} #{y}"
183 PieceFU::new(self, x, y, sente)
185 PieceKY::new(self, x, y, sente)
187 PieceKE::new(self, x, y, sente)
189 PieceGI::new(self, x, y, sente)
191 PieceKI::new(self, x, y, sente)
193 PieceOU::new(self, x, y, sente)
195 PieceKA::new(self, x, y, sente)
197 PieceHI::new(self, x, y, sente)
199 PieceFU::new(self, x, y, sente, true)
201 PieceKY::new(self, x, y, sente, true)
203 PieceKE::new(self, x, y, sente, true)
205 PieceGI::new(self, x, y, sente, true)
207 PieceKA::new(self, x, y, sente, true)
209 PieceHI::new(self, x, y, sente, true)
211 raise "unkown piece #{name}"
224 while (str.length > 3)
225 str.sub!(/^..(..)/, '')
229 PieceFU::new(self, 0, 0, sente)
231 PieceKY::new(self, 0, 0, sente)
233 PieceKE::new(self, 0, 0, sente)
235 PieceGI::new(self, 0, 0, sente)
237 PieceKI::new(self, 0, 0, sente)
239 PieceKA::new(self, 0, 0, sente)
241 PieceHI::new(self, 0, 0, sente)
243 raise "unkown piece #{name}"
251 raise "bad line: #{str}"
256 # Set up a board starting with a position after the moves.
257 # Failing to parse the moves raises an ArgumentError.
258 # @param moves an array of moves. ex. ["+7776FU", "-3334FU"] or
259 # an array of arrays. ex. [["+7776FU","T2"], ["-3334FU","T5"]]
261 def set_from_moves(moves)
263 return :normal if moves.empty?
269 rt = handle_one_move(move[0], @teban)
271 rt = handle_one_move(move, @teban)
273 raise ArgumentError, "bad moves: #{moves}" unless rt == :normal
275 @initial_moves = moves.dup
278 def have_piece?(hands, name)
279 piece = hands.find { |i|
285 # :illegal and :outori do not change this instance (self).
288 x0, x1, y0, y1, name, sente = move.x0, move.x1, move.y0, move.y1, move.name, move.sente
296 piece = have_piece?(hands, name)
297 return :illegal if (piece == nil || ! piece.move_to?(x1, y1, name))
298 piece.move_to(x1, y1)
300 if (@array[x0][y0] == nil || !@array[x0][y0].move_to?(x1, y1, name))
303 if (@array[x1][y1] && @array[x1][y1].name == "OU")
307 # Change the state of this instance (self)
308 if (@array[x0][y0].name != name && !@array[x0][y0].promoted)
309 # the piece is promoting
310 @array[x0][y0].promoted = true
311 move.promotion = true
313 if (@array[x1][y1]) # capture
314 move.set_captured_piece(@array[x1][y1])
315 @array[x1][y1].sente = @array[x0][y0].sente
316 @array[x1][y1].move_to(0, 0)
317 hands.sort! {|a, b| # TODO refactor. Move to Piece class
321 @array[x0][y0].move_to(x1, y1)
324 @teban = @teban ? false : true
328 # Get back the previous move, which moved a name piece from [x0,y0] to
329 # [x1, y1] with or without promotion. If the move captured
330 # a piece, it is captured_piece, which is now in hand. The captured_piece
331 # was promoted or unpromoted.
340 piece = @array[move.x1][move.y1]
344 piece.move_to(move.x0, move.y0)
345 piece.promoted = false if piece.promoted && move.promotion
346 if move.captured_piece
347 move.captured_piece.move_to(move.x1, move.y1)
348 move.captured_piece.sente = move.sente ? false : true
349 move.captured_piece.promoted = true if move.captured_piece_promoted
354 @teban = @teban ? false : true
358 # def each_reserved_square
360 def look_for_ou(sente)
366 (@array[x][y].name == "OU") &&
367 (@array[x][y].sente == sente))
374 raise "can't find ou"
377 # See if sente is checked (i.e. loosing) or not.
378 # Note that the method name "checkmated?" is wrong. Instead, it should be
381 def checkmated?(sente)
382 ou = look_for_ou(sente)
388 (@array[x][y].sente != sente))
389 if (@array[x][y].movable_grids.include?([ou.x, ou.y]))
400 # See if sente's FU drop checkmates the opponent or not.
402 def uchifuzume?(sente)
403 rival_ou = look_for_ou(! sente) # rival's ou
404 if (sente) # rival is gote
405 if ((rival_ou.y != 9) &&
406 (@array[rival_ou.x][rival_ou.y + 1]) &&
407 (@array[rival_ou.x][rival_ou.y + 1].name == "FU") &&
408 (@array[rival_ou.x][rival_ou.y + 1].sente == sente)) # uchifu true
410 fu_y = rival_ou.y + 1
415 if ((rival_ou.y != 1) &&
416 (@array[rival_ou.x][rival_ou.y - 1]) &&
417 (@array[rival_ou.x][rival_ou.y - 1].name == "FU") &&
418 (@array[rival_ou.x][rival_ou.y - 1].sente == sente)) # uchifu true
420 fu_y = rival_ou.y - 1
426 ## case: rival_ou is moving
427 rival_ou.movable_grids.each do |(cand_x, cand_y)|
428 tmp_board = deep_copy
429 s = tmp_board.move_to(Move.new(rival_ou.x, rival_ou.y, cand_x, cand_y, "OU", ! sente))
430 raise "internal error" if (s != true)
431 if (! tmp_board.checkmated?(! sente)) # good move
436 ## case: rival is capturing fu
442 (@array[x][y].sente != sente) &&
443 @array[x][y].movable_grids.include?([fu_x, fu_y])) # capturable
446 if (@array[x][y].promoted)
447 names << @array[x][y].promoted_name
449 names << @array[x][y].name
450 if @array[x][y].promoted_name &&
451 @array[x][y].move_to?(fu_x, fu_y, @array[x][y].promoted_name)
452 names << @array[x][y].promoted_name
456 tmp_board = deep_copy
457 s = tmp_board.move_to(Move.new(x, y, fu_x, fu_y, name, ! sente))
461 tmp_board.checkmated?(! sente) # result
464 all_illegal = names.find {|a| a != :illegal}
465 raise "internal error: legal move not found" if all_illegal == nil
466 r = names.find {|a| a == false} # good move
467 return false if r == false # found good move
476 # @[sente|gote]_history has at least one item while the player is checking the other or
478 def update_sennichite(player)
481 if checkmated?(!player)
483 @sente_history["dummy"] = 1 # flag to see Sente player is checking Gote player
485 @gote_history["dummy"] = 1 # flag to see Gote player is checking Sente player
489 @sente_history.clear # no more continuous check
491 @gote_history.clear # no more continuous check
494 if @sente_history.size > 0 # possible for Sente's or Gote's turn
495 @sente_history[str] += 1
497 if @gote_history.size > 0 # possible for Sente's or Gote's turn
498 @gote_history[str] += 1
502 # Deep-copy sennichite stuff, which will later be available to restore.
504 def dup_sennichite_stuff
505 return [@history.dup, @sente_history.dup, @gote_history.dup]
508 # Restore sennihite stuff.
510 def restore_sennichite_stuff(history, sente_history, gote_history)
511 @history, @sente_history, @gote_history = history, sente_history, gote_history
514 def oute_sennichite?(player)
515 return nil unless sennichite?
519 if (@sente_history[to_s] >= 4) # sente is checking gote
520 return :oute_sennichite_sente_lose
521 elsif (@gote_history[to_s] >= 3) # sente is escaping
522 return :oute_sennichite_gote_lose
524 return nil # Not oute_sennichite, but sennichite
528 if (@gote_history[to_s] >= 4) # gote is checking sente
529 return :oute_sennichite_gote_lose
530 elsif (@sente_history[to_s] >= 3) # gote is escaping
531 return :oute_sennichite_sente_lose
533 return nil # Not oute_sennichite, but sennichite
539 if (@history[to_s] >= 4) # already 3 times
545 def good_kachi?(sente)
546 if (checkmated?(sente))
547 puts "'NG: Checkmating." if $DEBUG
551 ou = look_for_ou(sente)
552 if (sente && (ou.y >= 4))
553 puts "'NG: Black's OU does not enter yet." if $DEBUG
556 if (! sente && (ou.y <= 6))
557 puts "'NG: White's OU does not enter yet." if $DEBUG
575 (@array[x][y].sente == sente) &&
576 (@array[x][y].point > 0))
577 point = point + @array[x][y].point
583 hands.each do |piece|
584 point = point + piece.point
588 puts "'NG: Piece#[%d] is too small." % [number] if $DEBUG
593 puts "'NG: Black's point#[%d] is too small." % [point] if $DEBUG
598 puts "'NG: White's point#[%d] is too small." % [point] if $DEBUG
603 puts "'Good: Piece#[%d], Point[%d]." % [number, point] if $DEBUG
607 # sente is nil only if tests in test_board run
614 # - :oute_sennichite_sente_lose
615 # - :oute_sennichite_gote_lose
619 # - (:outori will not be returned)
621 def handle_one_move(str, sente=nil)
622 if (str =~ /^([\+\-])(\d)(\d)(\d)(\d)([A-Z]{2})/)
629 elsif (str =~ /^%KACHI/)
630 raise ArgumentError, "sente is null", caller if sente == nil
631 if (good_kachi?(sente))
636 elsif (str =~ /^%TORYO/)
642 if (((x0 == 0) || (y0 == 0)) && # source is not from hand
643 ((x0 != 0) || (y0 != 0)))
645 elsif ((x1 == 0) || (y1 == 0)) # destination is out of board
650 sente = true if sente == nil # deprecated
651 return :illegal unless sente == true # black player's move must be black
654 sente = false if sente == nil # deprecated
655 return :illegal unless sente == false # white player's move must be white
660 if ((x0 == 0) && (y0 == 0))
661 return :illegal if (! have_piece?(hands, name))
662 elsif (! @array[x0][y0])
663 return :illegal # no piece
664 elsif (@array[x0][y0].sente != sente)
665 return :illegal # this is not mine
666 elsif (@array[x0][y0].name != name)
667 return :illegal if (@array[x0][y0].promoted_name != name) # can't promote
671 if (@array[x1][y1] &&
672 (@array[x1][y1].sente == sente)) # can't capture mine
674 elsif ((x0 == 0) && (y0 == 0) && @array[x1][y1])
675 return :illegal # can't put on existing piece
678 move = Move.new(x0, y0, x1, y1, name, sente)
679 result = move_to(move)
680 if (result == :illegal)
684 if (checkmated?(sente))
686 return :oute_kaihimore
688 if ((x0 == 0) && (y0 == 0) && (name == "FU") && uchifuzume?(sente))
693 sennichite_stuff = dup_sennichite_stuff
694 update_sennichite(sente)
695 os_result = oute_sennichite?(sente)
696 if os_result # :oute_sennichite_sente_lose or :oute_sennichite_gote_lose
698 restore_sennichite_stuff(*sennichite_stuff)
703 restore_sennichite_stuff(*sennichite_stuff)
710 # Return a CSA-styled string notation of the current position.
716 a.push(sprintf("P%d", y))
728 a.push(sprintf("\n"))
731 if (! sente_hands.empty?)
733 sente_hands.each do |p|
734 a.push("00" + p.name)
738 if (! gote_hands.empty?)
740 gote_hands.each do |p|
741 a.push("00" + p.name)
745 a.push("%s\n" % [@teban ? "+" : "-"])
749 # Return a CSA-styled string notation of the initial position.
752 tmp_board = self.class.new
754 return tmp_board.to_s