X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=Board.pm;h=91d1a15f7f42b29d5057c2cb9205ae4874a52361;hb=1c8fd12582bf90b4cb31a4bdf6a82bbdd939acb4;hp=f20cecfea2faf2cdf2ad357c16959bcb420bfd1c;hpb=12ec00ad8a58c24a674bf5209ec5e004e60b93ab;p=remoteglot

diff --git a/Board.pm b/Board.pm
index f20cecf..91d1a15 100644
--- a/Board.pm
+++ b/Board.pm
@@ -148,6 +148,8 @@ sub move_to_uci_notation {
 	return _pos_to_square($from_row, $from_col) . _pos_to_square($to_row, $to_col) . $promo;
 }
 
+# Note: This is in general not a validation that the move is actually allowed
+# (e.g. you can castle even though you're in check).
 sub parse_pretty_move {
 	my ($board, $move, $toplay) = @_;
 
@@ -170,38 +172,48 @@ sub parse_pretty_move {
 
 	# Parse promo
 	my $promo;
-	if ($move =~ s/=([QRNB])$//) {
+	if ($move =~ s/=?([QRNB])$//) {
 		$promo = $1;
 	}
 
 	$move =~ /^([KQRBN])?([a-h])?([1-8])?x?([a-h][1-8])$/ or die "Invalid move $move";
-	my $piece = $1 // 'P';
+	my $piece = $1;
 	my $from_col = defined($2) ? _col_letter_to_num($2) : undef;
 	my $from_row = defined($3) ? _row_letter_to_num($3) : undef;
+	if (!defined($piece) && (!defined($from_col) || !defined($from_row))) {
+		$piece = 'P';
+	}
 	my ($to_row, $to_col) = _square_to_pos($4);
 	
 	# Find all possible from-squares that could have been meant.
 	my @squares = ();
 	my $side = 'K';
 	if ($toplay eq 'B') {
-		$piece = lc($piece);
+		$piece = lc($piece) if defined($piece);
 		$side = 'k';
 	}
 	for my $row (0..7) {
 		next if (defined($from_row) && $from_row != $row);
 		for my $col (0..7) {
 			next if (defined($from_col) && $from_col != $col);
-			next if ($board->[$row][$col] ne $piece);
-			next if (!$board->can_reach($piece, $row, $col, $to_row, $to_col));
-
-			# See if doing this move would put us in check
-			# (yes, there are clients that expect us to do this).
-			next if ($board->make_move($row, $col, $to_row, $to_col, $promo)->in_check($side));
+			next if (defined($piece) && $board->[$row][$col] ne $piece);
 			push @squares, [ $row, $col ];
 		}
 	}
+	if (scalar @squares > 1) {
+		# Filter out pieces which cannot reach this square.
+		@squares = grep { $board->can_reach($piece, $_->[0], $_->[1], $to_row, $to_col) } @squares;
+	}
+	if (scalar @squares > 1) {
+		# See if doing this move would put us in check
+		# (yes, there are clients that expect us to do this).
+		@squares = grep { !$board->make_move($_->[0], $_->[1], $to_row, $to_col, $promo)->in_check($side) } @squares;
+	}
+	if (scalar @squares == 0) {
+		die "Impossible move $move";
+	}
 	if (scalar @squares != 1) {
-		die "Ambigious or impossible move $move";
+		die "Ambigious move $move";
 	}
 	return (@{$squares[0]}, $to_row, $to_col, $promo);
 }
@@ -218,6 +230,45 @@ sub fen {
 	return join('/', @rows);
 }
 
+# Returns a compact bit string describing the same data as fen().
+# This is encoded using a Huffman-like encoding, and should be
+# typically about 1/3 the number of bytes.
+sub bitpacked_fen {
+	my ($board) = @_;
+	my $bits = "";
+
+	for my $row (0..7) {
+		for my $col (0..7) {
+			my $piece = $board->[$row][$col];
+			if ($piece eq '-') {
+				$bits .= "0";
+				next;
+			}
+
+			my $color = (lc($piece) eq $piece) ? 0 : 1;
+			$bits .= "1" . $color;
+
+			if (lc($piece) eq 'p') {
+				$bits .= "0";
+			} elsif (lc($piece) eq 'n') {
+				$bits .= "100";
+			} elsif (lc($piece) eq 'b') {
+				$bits .= "101";
+			} elsif (lc($piece) eq 'r') {
+				$bits .= "1110";
+			} elsif (lc($piece) eq 'q') {
+				$bits .= "11110";
+			} elsif (lc($piece) eq 'k') {
+				$bits .= "11111";
+			} else {
+				die "Unknown piece $piece";
+			}
+		}
+	}
+
+	return pack('b*', $bits);
+}
+
 sub can_reach {
 	my ($board, $piece, $from_row, $from_col, $to_row, $to_col) = @_;
 	
@@ -425,6 +476,19 @@ sub prettyprint_move {
 	return ($pretty, $nb);
 }
 
+sub num_pieces {
+	my ($board) = @_;
+
+	my $num = 0;
+	for my $row (0..7) {
+		for my $col (0..7) {
+			my $piece = $board->[$row][$col];
+			++$num if ($piece ne '-');
+		}
+	}
+	return $num;	
+}
+
 sub _prettyprint_move_no_check_or_mate {
         my ($board, $from_row, $from_col, $to_row, $to_col, $promo) = @_;
 	my $piece = $board->[$from_row][$from_col];
@@ -467,7 +531,7 @@ sub _prettyprint_move_no_check_or_mate {
 			if (defined($promo) && $promo ne '') {
 				# promotion
 				$pretty .= "=";
-				$pretty .= $promo;
+				$pretty .= uc($promo);
 			}
 		}
 		return $pretty;