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#
# Ceibal Chess - A chess activity for Sugar.
# Copyright (C) 2008, 2009 Alejandro Segovia <asegovi@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
import os
import sys
from subprocess import Popen, PIPE
from piece import Move
from errors import IAError
import logging
log = logging.getLogger()
class GnuChessEngine:
'''GNU Chess wrapper class.'''
def __init__(self):
'''Create a new instance of the GNU Chess wrapper, locate the
gnuchess executable, open a pipe to it and setup the comm.'''
try:
path = os.path.join(os.environ["SUGAR_BUNDLE_PATH"],"engines")
if not "Ajedrez.activity" in path:
print "Runningn ceibal-chess from Terminal or some other place"
path = os.path.join("", "engines")
except:
path = os.path.join(".", "engines")
self.plat = sys.platform
if self.plat == "linux2":
engine_exec = "gnuchess-linux"
elif self.plat == "darwin":
engine_exec = "gnuchess-osx"
elif self.plat == "win32":
engine_exec = "gnuchess-win32.exe"
else:
log.warn("No gnuchess for %s, using system default", plat)
engine_exec = ""
if engine_exec != "":
engine_path = os.path.join(path, engine_exec)
else:
log.info("Trying to find gnuchess in PATH")
engine_path = "gnuchess"
#Check whether the engine is executable:
if not os.access(engine_path.split()[0], os.X_OK):
log.error("Engine is not executable, try: chmod +x %s",
engine_path.split()[0])
raise IOError("Chess engine is not executable.")
args = [engine_exec, '-e', '-x']
try:
if self.plat == "win32":
self.proc = Popen(args, executable=os.path.abspath(engine_path), stdin=PIPE, stdout=PIPE)
else:
self.proc = Popen(args, executable=os.path.abspath(engine_path), stdin=PIPE, stdout=PIPE, close_fds=True)
self.fin = self.proc.stdout
self.fout = self.proc.stdin
#Check pipe:
self.fout.write("\n")
self.fout.flush()
self.fin.readline()
self.fin.readline()
self.fin.readline()
self.fout.write("depth 1\n")
except Exception, ex:
print ex
self.close()
raise
def undo(self):
# undo ai move
self.fout.write('undo\n')
# undo player move
self.fout.write('undo\n')
self.fout.flush()
def move(self, move, controller):
'''Write a player's move to GNU Chess. Return the engine's move.'''
move_str = self.move_to_gnuchess(move)
log.debug("Calling GNU Chess with move: %s", move_str)
self.fout.write(move_str + "\n")
self.fout.flush()
l = self.fin.readline()
while l.find("My move is") == -1:
if l.find("Illegal move") != -1:
raise IAError( \
"Player performed an illegal move: (%s), move was: %s" %
(l, move_str))
l = self.fin.readline()
ans = l.split()[3]
log.debug("got answer from gnuchess '%s'", l)
chess_ans = None
type = None
if len(ans) == 4:
chess_ans = (self.gnuchess_to_coords(ans[:2]), \
self.gnuchess_to_coords(ans[2:]))
elif len(ans) == 5:
chess_ans = (self.gnuchess_to_coords(ans[:2]), \
self.gnuchess_to_coords(ans[2:4]))
type = ans[4].upper()
else:
raise IAError("Unknown answer from gnuchess: %s" % (ans))
controller.move(controller.board.black, chess_ans[0], chess_ans[1], type=type)
def close(self):
try:
if self.fout:
self.fout.write("quit\n")
self.fout.flush()
self.fout.close()
self.fout = None
if self.fin:
self.fin.close()
self.fin = None
finally:
if self.proc:
try:
if self.plat == "win32":
pass
#os.system("taskkill /PID %s" %self.proc.pid)
#FIXME: Add something to kill the process in Windows OS,
#the os.system solution does not work.
else:
os.kill(self.proc.pid, 15)
except OSError:
pass
self.proc.wait()
self.proc = None
def move_to_gnuchess(self, move):
return str(move)
def gnuchess_to_coords(self, move):
letters = ["a", "b", "c", "d", "e", "f", "g", "h"]
c = letters.index(move[0])
r = int(8 - int(move[1]))
return (c,r)
def assert_sync(self, board):
'''
Validate whether the AI's internal representation of the board
matches our board.
Raises IAError (games out of sync) on error, otherwise, just returns.
This is rather expensive and should only be perfomed
in debug mode.
'''
log.debug("Called IA.assert_sync...")
try:
self.fout.write("show board\n")
self.fout.write("\n")
self.fout.flush()
log.debug("read 1...")
self.fin.readline()
log.debug("read 2...")
ai_turn = self.fin.readline().split(" ")[0]
#if ai_turn != board.current_turn.name:
# raise IAError("Turns out of sync!")
line = ""
ai_row = []
while len(ai_row) < 8:
line = self.fin.readline().replace("\n", "").strip()
ai_row = line.split(" ")
for row in range(8):
log.debug("row %d: %s" % (row, line))
for col in range(8):
ai_cell = ai_row[col]
if ai_cell == ".":
if not board[col, row].piece:
continue
raise AIError( \
"Out of sync: AI thinks (%d, %d) should be empty" %
(col, row))
if ai_cell.upper() != board[col, row].piece.CODE:
raise AIError("Out of sync: piece at (%d, %d) differs" %
(col, row))
if ai_cell.islower() and board[col, row].piece.owner.name != "black":
raise AIError("Out of sync: owner at (%d, %d) differs" %
(col, row))
if ai_cell.isupper() and board[col, row].piece.owner.name != "white":
raise AIError("Out of sync: owner at (%d, %d) differs" %
(col, row))
if row < 7:
line = self.fin.readline().replace("\n", "").strip()
ai_row = line.split(" ")
log.debug("read 10...")
self.fin.readline()
log.debug("read 11...")
self.fin.readline()
except IOError, err:
raise IAError("Could not talk to engine: %s" % err.message )
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