X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=Position.pm;h=7834ca065185ad005be02cf06d252756b08dd3ae;hb=8fcd3d2321344017e376668cb5d1f5ea7cb47c20;hp=e2c9801d7c5957abbaf5eca6eb4437424c6e9887;hpb=c5722d685ee1354ce6466c1cf3ec947c0045ec14;p=remoteglot-book diff --git a/Position.pm b/Position.pm index e2c9801..7834ca0 100644 --- a/Position.pm +++ b/Position.pm @@ -34,6 +34,11 @@ sub new { return $pos; } +sub start_pos { + my ($class, $white, $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 fen { my $pos = shift; @@ -101,4 +106,74 @@ sub to_json_hash { return { %$pos, board => undef, fen => $pos->fen() }; } +sub parse_pretty_move { + my ($pos, $move) = @_; + return $pos->{'board'}->parse_pretty_move($move, $pos->{'toplay'}); +} + +# Returns a new Position object. +sub make_move { + my ($pos, $from_row, $from_col, $to_row, $to_col, $promo) = @_; + + 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'}; + $np->{'last_move'} = '(move)'; # FIXME + return bless $np; +} + +sub _pos_to_square { + my ($row, $col) = @_; + return sprintf("%c%d", ord('a') + $col, 8 - $row); +} + 1;