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ChessPosition.m
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ChessPosition.m
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/*
Stockfish, a OS X GUI for the UCI chess engine with the same name.
Copyright (C) 2004-2011 Marco Costalba, Joona Kiiski, Tord Romstad
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#import "ChessPosition.h"
#import "ChessMove.h"
#import "frc-fens.h"
@implementation ChessPosition
// The following method should be improved!
+(BOOL)looksLikeAFENString:(NSString *)string {
NSCharacterSet *allowedFirstCharacters =
[NSCharacterSet characterSetWithCharactersInString:
@"pnbrqkPNBRQK12345678"];
const char *cstring;
int numOfSlashes, i;
NSRange range;
// Does the string start with a valid character?
range = [string rangeOfCharacterFromSet: allowedFirstCharacters];
if(range.location != 0) return NO;
// Count the number of slashes:
numOfSlashes = 0;
cstring = [string UTF8String];
for(i = 0; i < [string length]; i++)
if(cstring[i] == '/') numOfSlashes++;
if(numOfSlashes != 7) return NO;
return YES;
}
+(void)initialize {
init();
[super initialize];
}
+(id)initialPosition {
ChessPosition *p =
[[ChessPosition alloc]
initWithFEN: [NSString stringWithUTF8String: STARTPOS]];
[p autorelease];
return p;
}
+(id)positionAfterMakingMove: (ChessMove *)move
fromPosition:(ChessPosition *)position {
ChessPosition *newPosition = [[ChessPosition alloc] init];
undo_info_t u[1];
copy_position([newPosition pos], [position pos]);
make_move([newPosition pos], [move move], u);
[newPosition autorelease];
return newPosition;
}
+(NSString *)fenFromFRCid:(int)FRCid {
return [NSString stringWithUTF8String: FRCFens[FRCid]];
}
+(id)positionWithFRCid:(int)FRCid {
ChessPosition *p =
[[ChessPosition alloc] initWithFEN: [ChessPosition fenFromFRCid: FRCid]];
[p autorelease];
return p;
}
-(id)initWithFEN:(NSString *)fen {
[super init];
position_from_fen(pos, [fen UTF8String]);
return self;
}
-(id)init {
[super init];
return self;
}
-(NSString *)FENString {
char str[256];
return [NSString stringWithUTF8String: position_to_fen(pos, str)];
}
-(NSString *)description {
return [NSString stringWithFormat: @"<ChessPosition: %@ (0x%llxULL)>",
[self FENString], pos->key];
}
-(NSString *)moveToSAN:(NSString *)moveString {
char str[16];
return [NSString stringWithUTF8String:
san_move_from_string(pos, [moveString UTF8String], str)];
}
static char Str[2048];
-(NSString *)lineToSAN:(NSString *)lineString moveNumbers:(BOOL)moveNums {
// char str[2048];
return [NSString stringWithUTF8String:
san_line_from_string(pos, 0, NO, moveNums,
[lineString UTF8String], Str)];
}
-(NSString *)lineToSAN:(NSString *)lineString {
return [self lineToSAN: lineString moveNumbers: YES];
}
-(position_t *)pos {
return pos;
}
-(uint64_t)hashkey {
return pos->key;
}
-(int)pieceAtSquare:(int)squareIndex {
return pos->board[EXPAND(squareIndex)];
}
-(BOOL)whiteToMove {
return (pos->side == WHITE)? YES : NO;
}
-(int)moveNumber {
if((pos->side == WHITE && pos->gply % 2 == 0) ||
(pos->side == BLACK && pos->gply % 2 == 1))
return pos->gply / 2 + 1;
else
return pos->gply / 2 + 2;
}
-(ChessMove *)generateMoveFrom:(int)from to:(int)to
promotion:(int)promotion {
ChessMove *move;
move = [[ChessMove alloc]
initWithPosition: self
move: find_move_matching(pos, EXPAND(from), EXPAND(to), promotion)];
[move autorelease];
return move;
}
-(ChessMove *)generateMoveFrom:(int)from to:(int)to {
return [self generateMoveFrom: from to: to promotion: 0];
}
-(int)countLegalMoves {
return count_legal_moves(pos);
}
-(BOOL)moveFrom:(int)from to:(int)to promotion:(int)promotion {
move_t m = find_move_matching(pos, EXPAND(from), EXPAND(to), promotion);
undo_info_t u[1];
if(m == 0) return NO;
make_move(pos, m, u);
return YES;
}
-(BOOL)moveFrom:(int)from to:(int)to {
return [self moveFrom:from to:to promotion:0];
}
-(void)makeMove:(ChessMove *)move {
// Should check for legality!
undo_info_t u[1];
make_move(pos, [move move], u);
}
-(void)destinationSquaresFrom:(int)sqIndex storeIn:(int *)sqArray {
find_destination_squares_from(pos, EXPAND(sqIndex), sqArray);
}
-(ChessMove *)parseSANMove:(NSString *)str {
move_t m = parse_san_move(pos, [str UTF8String]);
ChessMove *move;
if(m == 0) return nil;
move = [[ChessMove alloc] initWithPosition: self move: m];
[move autorelease];
return move;
}
// Parse move in g1f3 notation. We should check for legality ...
-(ChessMove *)parseCoordinateMove:(NSString *)str {
move_t m = parse_move(pos, [str UTF8String]);
ChessMove *move = [[ChessMove alloc] initWithPosition: self move:m];
[move autorelease];
return move;
}
-(void)display {
print_position(pos);
}
-(BOOL)isEqualToPosition:(ChessPosition *)aPosition {
if([aPosition pos]->key == [self pos]->key)
return YES;
else
return NO;
}
-(BOOL)isMate {
return position_is_mate(pos);
}
-(BOOL)isRule50Draw {
return position_is_rule50_draw(pos);
}
-(BOOL)isRepetitionDraw {
return position_is_repetition_draw(pos);
}
-(BOOL)isMaterialDraw {
return position_is_material_draw(pos);
}
-(BOOL)isStalemate {
return position_is_stalemate(pos);
}
-(BOOL)isDraw {
return position_is_draw(pos);
}
-(BOOL)isTerminal {
return (position_is_mate(pos) || position_is_draw(pos));
}
-(BOOL)whiteCanCastleKingside {
if(CanCastleKingside(pos, WHITE)) return YES;
else return NO;
}
-(BOOL)whiteCanCastleQueenside {
if(CanCastleQueenside(pos, WHITE)) return YES;
else return NO;
}
-(BOOL)blackCanCastleKingside {
if(CanCastleKingside(pos, BLACK)) return YES;
else return NO;
}
-(BOOL)blackCanCastleQueenside {
if(CanCastleQueenside(pos, BLACK)) return YES;
else return NO;
}
-(BOOL)sideToMoveCanCastleKingsideImmediately {
if(can_castle_kingside(pos)) return YES;
else return NO;
}
-(BOOL)sideToMoveCanCastleQueensideImmediately {
if(can_castle_queenside(pos)) return YES;
else return NO;
}
-(ChessMove *)generateOO {
ChessMove *move;
move = [[ChessMove alloc]
initWithPosition: self
move: can_castle_kingside(pos)];
[move autorelease];
return move;
}
-(ChessMove *)generateOOO {
ChessMove *move;
move = [[ChessMove alloc]
initWithPosition: self
move: can_castle_queenside(pos)];
[move autorelease];
return move;
}
-(NSString *)UCIStringFromOOMove:(ChessMove *)move {
int rank = SquareRank(MvFrom([move move]));
return [NSString stringWithFormat: @"%c%d%c%d",
pos->initial_ksq + 'a', rank + 1,
pos->initial_krsq + 'a', rank + 1];
}
-(NSString *)UCIStringFromOOOMove:(ChessMove *)move {
int rank = SquareRank(MvFrom([move move]));
return [NSString stringWithFormat: @"%c%d%c%d",
pos->initial_ksq + 'a', rank + 1,
pos->initial_qrsq + 'a', rank + 1];
}
-(void)putPiece:(int)piece atSquare:(int)squareIndex {
pos->board[EXPAND(squareIndex)] = piece;
}
// USE THE FOLLOWING FUNCTIONS ONLY IF YOU REALLY KNOW WHAT YOU'RE DOING!
// They will usually leave the position object in an inconsistent state.
-(void)removePieceAtSquare:(int)squareIndex {
pos->board[EXPAND(squareIndex)] = EMPTY;
}
-(void)dealloc {
// NSLog(@"Destroying %@", self);
[super dealloc];
}
@end