Add some more utility functions.

[remoteglot] / Position.pm

diff --git a/Position.pm b/Position.pm
index 7bdb913fa5716aedc9cd81fab34b0a1789250b30..5d63ae2ff662d9abce22ba9bbe40a729ea7b8f8d 100644 (file)
--- a/Position.pm
+++ b/Position.pm
@@ -15,7 +15,6 @@ sub new {
        my $pos = {};
        my (@x) = split / /, $str;
 
-       # TODO: Not all of this stuff really belongs in this module.
        $pos->{'board'} = Board->new(@x[1..8]);
        $pos->{'toplay'} = $x[9];
        $pos->{'ep_file_num'} = $x[10];
@@ -23,23 +22,23 @@ sub new {
        $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->{'move_num'} = $x[26];
-       if ($x[27] =~ /([a-h][1-8])-([a-h][1-8])/) {
-               $pos->{'last_move_uci'} = $1 . $2;
-       } else {
-               $pos->{'last_move_uci'} = undef;
-       }
        $pos->{'last_move'} = $x[29];
 
        bless $pos, $class;
        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;
 
@@ -81,11 +80,11 @@ sub fen {
                # "right" thing as per the standard, though.
                #
                if ($pos->{'toplay'} eq 'B') {
-                       $ep = $nep if ($col > 0 && substr($pos->{'board'}[4], $col-1, 1) eq 'p');
-                       $ep = $nep if ($col < 7 && substr($pos->{'board'}[4], $col+1, 1) eq 'p');
+                       $ep = $nep if ($col > 0 && $pos->{'board'}[4][$col-1] eq 'p');
+                       $ep = $nep if ($col < 7 && $pos->{'board'}[4][$col+1] eq 'p');
                } else {
-                       $ep = $nep if ($col > 0 && substr($pos->{'board'}[3], $col-1, 1) eq 'P');
-                       $ep = $nep if ($col < 7 && substr($pos->{'board'}[3], $col+1, 1) eq 'P');
+                       $ep = $nep if ($col > 0 && $pos->{'board'}[3][$col-1] eq 'P');
+                       $ep = $nep if ($col < 7 && $pos->{'board'}[3][$col+1] eq 'P');
                }
        }
        $fen .= " ";
@@ -93,7 +92,7 @@ sub fen {
 
        # half-move clock
        $fen .= " ";
-       $fen .= $pos->{'time_to_100move_rule'};
+       $fen .= $pos->{'time_since_100move_rule_reset'};
 
        # full-move clock
        $fen .= " ";
@@ -107,4 +106,104 @@ sub to_json_hash {
        return { %$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 - $row);
+}
+
+sub apply_uci_pv {
+       my ($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;