#
use strict;
use warnings;
+use MIME::Base64;
require 'Board.pm';
$pos->{'white_castle_q'} = $x[12];
$pos->{'black_castle_k'} = $x[13];
$pos->{'black_castle_q'} = $x[14];
- $pos->{'time_to_100move_rule'} = $x[15];
+ $pos->{'time_since_100move_rule_reset'} = $x[15];
$pos->{'player_w'} = $x[17];
$pos->{'player_b'} = $x[18];
- $pos->{'player_w'} =~ s/^[IG]M//;
- $pos->{'player_b'} =~ s/^[IG]M//;
+ $pos->{'player_w'} =~ s/^W?[FCIG]M//;
+ $pos->{'player_b'} =~ s/^W?[FCIG]M//;
+ $pos->{'white_clock'} = $x[24];
+ $pos->{'black_clock'} = $x[25];
$pos->{'move_num'} = $x[26];
if ($x[27] =~ /([a-h][1-8])-([a-h][1-8])/) {
$pos->{'last_move_uci'} = $1 . $2;
$pos->{'last_move_uci'} = undef;
}
$pos->{'last_move'} = $x[29];
+ $pos->{'prettyprint_cache'} = {};
bless $pos, $class;
return $pos;
}
+sub start_pos {
+ my ($class, $white, $black) = @_;
+ $white = "base64:" . MIME::Base64::encode_base64($white);
+ $black = "base64:" . MIME::Base64::encode_base64($black);
+ return $class->new("<12> rnbqkbnr pppppppp -------- -------- -------- -------- PPPPPPPP RNBQKBNR W -1 1 1 1 1 0 dummygamenum $white $black -2 dummytime dummyincrement 39 39 dummytime dummytime 1 none (0:00) none 0 0 0");
+}
+
+sub from_fen {
+ my ($class, $fen) = @_;
+ my ($board, $toplay, $castling, $ep_square, $halfmove_clock, $fullmove_clock) = split / /, $fen;
+
+ my $pos = {};
+ $board =~ s/(\d)/"-"x$1/ge;
+ $pos->{'board'} = Board->new(split /\//, $board);
+ $pos->{'toplay'} = uc($toplay);
+
+ if ($ep_square =~ /^([a-h])/) {
+ $pos->{'ep_file_num'} = ord($1) - ord('a');
+ } else {
+ $pos->{'ep_file_num'} = -1;
+ }
+
+ $pos->{'white_castle_k'} = ($castling =~ /K/) ? 1 : 0;
+ $pos->{'white_castle_q'} = ($castling =~ /Q/) ? 1 : 0;
+ $pos->{'black_castle_k'} = ($castling =~ /k/) ? 1 : 0;
+ $pos->{'black_castle_q'} = ($castling =~ /q/) ? 1 : 0;
+ $pos->{'time_since_100move_rule_reset'} = $halfmove_clock // 0;
+ $pos->{'player_w'} = 'white';
+ $pos->{'player_b'} = 'black';
+ $pos->{'white_clock'} = 0;
+ $pos->{'black_clock'} = 0;
+ $pos->{'move_num'} = $fullmove_clock // 0;
+ $pos->{'last_move_uci'} = undef;
+ $pos->{'last_move'} = undef;
+ $pos->{'prettyprint_cache'} = {};
+
+ bless $pos, $class;
+ return $pos;
+}
+
sub fen {
my $pos = shift;
my $ep = "-";
if ($pos->{'ep_file_num'} != -1) {
my $col = $pos->{'ep_file_num'};
- my $nep = (qw(a b c d e f g h))[$col];
-
- if ($pos->{'toplay'} eq 'B') {
- $nep .= "3";
- } else {
- $nep .= "6";
- }
+ $ep = (qw(a b c d e f g h))[$col];
- #
- # Showing the en passant square when actually no capture can be made
- # seems to confuse at least Rybka. Thus, check if there's actually
- # a pawn of the opposite side that can do the en passant move, and if
- # not, just lie -- it doesn't matter anyway. I'm unsure what's the
- # "right" thing as per the standard, though.
- #
if ($pos->{'toplay'} eq 'B') {
- $ep = $nep if ($col > 0 && $pos->{'board'}[4][$col-1] eq 'p');
- $ep = $nep if ($col < 7 && $pos->{'board'}[4][$col+1] eq 'p');
+ $ep .= "3";
} else {
- $ep = $nep if ($col > 0 && $pos->{'board'}[3][$col-1] eq 'P');
- $ep = $nep if ($col < 7 && $pos->{'board'}[3][$col+1] eq 'P');
+ $ep .= "6";
}
}
$fen .= " ";
# half-move clock
$fen .= " ";
- $fen .= $pos->{'time_to_100move_rule'};
+ $fen .= $pos->{'time_since_100move_rule_reset'};
# full-move clock
$fen .= " ";
return $fen;
}
+# Returns a compact bit string describing the same data as fen(),
+# except for the half-move and full-move clock.
+sub bitpacked_fen {
+ my $pos = shift;
+ my $board = $pos->{'board'}->bitpacked_fen();
+
+ my $bits = "";
+ if ($pos->{'toplay'} eq 'W') {
+ $bits .= "0";
+ } else {
+ $bits .= "1";
+ }
+
+ $bits .= $pos->{'white_castle_k'};
+ $bits .= $pos->{'white_castle_q'};
+ $bits .= $pos->{'black_castle_k'};
+ $bits .= $pos->{'black_castle_q'};
+
+ my $col = $pos->{'ep_file_num'};
+ if ($col == -1) {
+ $bits .= "0";
+ } else {
+ $bits .= "1";
+ $bits .= (qw(000 001 010 011 100 101 110 111))[$col];
+ }
+
+ return $board . pack('b*', $bits);
+}
+
sub to_json_hash {
my $pos = shift;
- return { %$pos, board => undef, fen => $pos->fen() };
+ my $json = { %$pos, fen => $pos->fen() };
+ delete $json->{'board'};
+ delete $json->{'prettyprint_cache'};
+ delete $json->{'black_castle_k'};
+ delete $json->{'black_castle_q'};
+ delete $json->{'white_castle_k'};
+ delete $json->{'white_castle_q'};
+ delete $json->{'time_since_100move_rule_reset'};
+ if ($json->{'player_w'} =~ /^base64:(.*)$/) {
+ $json->{'player_w'} = MIME::Base64::decode_base64($1);
+ }
+ if ($json->{'player_b'} =~ /^base64:(.*)$/) {
+ $json->{'player_b'} = MIME::Base64::decode_base64($1);
+ }
+ return $json;
+}
+
+sub parse_pretty_move {
+ my ($pos, $move) = @_;
+ return $pos->{'board'}->parse_pretty_move($move, $pos->{'toplay'});
+}
+
+sub num_pieces {
+ my ($pos) = @_;
+ return $pos->{'board'}->num_pieces();
+}
+
+# Returns a new Position object.
+sub make_move {
+ my ($pos, $from_row, $from_col, $to_row, $to_col, $promo, $pretty_move) = @_;
+
+ my $from_square = _pos_to_square($from_row, $from_col);
+ my $to_square = _pos_to_square($to_row, $to_col);
+
+ my $np = {};
+ $np->{'board'} = $pos->{'board'}->make_move($from_row, $from_col, $to_row, $to_col, $promo);
+ if ($pos->{'toplay'} eq 'W') {
+ $np->{'toplay'} = 'B';
+ $np->{'move_num'} = $pos->{'move_num'};
+ } else {
+ $np->{'toplay'} = 'W';
+ $np->{'move_num'} = $pos->{'move_num'} + 1;
+ }
+
+ my $piece = $pos->{'board'}[$from_row][$from_col];
+ my $dest_piece = $pos->{'board'}[$to_row][$to_col];
+
+ # Find out if this was a two-step pawn move.
+ if (lc($piece) eq 'p' && abs($from_row - $to_row) == 2) {
+ $np->{'ep_file_num'} = $from_col;
+ } else {
+ $np->{'ep_file_num'} = -1;
+ }
+
+ # Castling rights.
+ $np->{'white_castle_k'} = $pos->{'white_castle_k'};
+ $np->{'white_castle_q'} = $pos->{'white_castle_q'};
+ $np->{'black_castle_k'} = $pos->{'black_castle_k'};
+ $np->{'black_castle_q'} = $pos->{'black_castle_q'};
+ if ($piece eq 'K') {
+ $np->{'white_castle_k'} = 0;
+ $np->{'white_castle_q'} = 0;
+ } elsif ($piece eq 'k') {
+ $np->{'black_castle_k'} = 0;
+ $np->{'black_castle_q'} = 0;
+ } elsif ($from_square eq 'a1' || $to_square eq 'a1') {
+ $np->{'white_castle_q'} = 0;
+ } elsif ($from_square eq 'h1' || $to_square eq 'h1') {
+ $np->{'white_castle_k'} = 0;
+ } elsif ($from_square eq 'a8' || $to_square eq 'a8') {
+ $np->{'black_castle_q'} = 0;
+ } elsif ($from_square eq 'h8' || $to_square eq 'h8') {
+ $np->{'black_castle_k'} = 0;
+ }
+
+ # 50-move rule.
+ if (lc($piece) eq 'p' || $dest_piece ne '-') {
+ $np->{'time_since_100move_rule_reset'} = 0;
+ } else {
+ $np->{'time_since_100move_rule_reset'} = $pos->{'time_since_100move_rule_reset'} + 1;
+ }
+ $np->{'player_w'} = $pos->{'player_w'};
+ $np->{'player_b'} = $pos->{'player_b'};
+ if (defined($pretty_move)) {
+ $np->{'last_move'} = $pretty_move;
+ } else {
+ my ($move, $nb) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
+ $np->{'last_move'} = $move;
+ }
+ $np->{'last_move_uci'} = Board::move_to_uci_notation($from_row, $from_col, $to_row, $to_col, $promo);
+
+ return bless $np;
+}
+
+# Returns a new Position object, and the parsed UCI move.
+sub make_pretty_move {
+ my ($pos, $move) = @_;
+
+ my ($from_row, $from_col, $to_row, $to_col, $promo) = $pos->parse_pretty_move($move);
+ my $uci_move = Board::move_to_uci_notation($from_row, $from_col, $to_row, $to_col, $promo);
+ $pos = $pos->make_move($from_row, $from_col, $to_row, $to_col, $promo);
+ return ($pos, $uci_move);
+}
+
+sub _pos_to_square {
+ my ($row, $col) = @_;
+ return sprintf("%c%d", ord('a') + $col, 8 - $row);
+}
+
+sub apply_uci_pv {
+ my ($pos, @pv) = @_;
+
+ my $pvpos = $pos;
+ for my $pv_move (@pv) {
+ my ($from_row, $from_col, $to_row, $to_col, $promo) = _parse_uci_move($pv_move);
+ $pvpos = $pvpos->make_move($from_row, $from_col, $to_row, $to_col, $promo);
+ }
+
+ return $pvpos;
+}
+
+sub _col_letter_to_num {
+ return ord(shift) - ord('a');
+}
+
+sub _row_letter_to_num {
+ return 7 - (ord(shift) - ord('1'));
+}
+
+sub _parse_uci_move {
+ my $move = shift;
+ my $from_col = _col_letter_to_num(substr($move, 0, 1));
+ my $from_row = _row_letter_to_num(substr($move, 1, 1));
+ my $to_col = _col_letter_to_num(substr($move, 2, 1));
+ my $to_row = _row_letter_to_num(substr($move, 3, 1));
+ my $promo = substr($move, 4, 1);
+ return ($from_row, $from_col, $to_row, $to_col, $promo);
}
1;
projects / remoteglot / blobdiff