/// <summary>
/// Parses Move object into Standard Algebraic Notation move-string
/// </summary>
/// <param name="move">Move to parse</param>
/// <returns>Parsed Move in SAN</returns>
/// <exception cref="ArgumentNullException">Given move was null or didn't have valid positions values</exception>
public string ParseToSan(Move move)
{
var(succeeded, exception) = SanBuilder.TryParse(this, move, out var san);
if (!succeeded && exception is not null)
{
throw exception;
}
return(san !);
}
/// <summary>
/// Parses San-notated move into Move object<br/>
/// Long algebraic notation is also acceptable
/// </summary>
/// <param name="san">San-notated move to parse</param>
/// <param name="resetSan">Whether SAN needs to be regenerated</param>
/// <returns>Parsed Move object</returns>
/// <exception cref="ChessArgumentException">Given San-notated move didn't match the Regex pattern</exception>
/// <exception cref="ChessSanNotFoundException">Given San-notated move is not valid for current board positions</exception>
/// <exception cref="ChessSanTooAmbiguousException">Given San-notated move is too ambiguous between multiple moves</exception>
public Move ParseFromSan(string san, bool resetSan = false)
{
var(succeeded, exception) = SanBuilder.TryParse(this, san, out var move, resetSan);
if (!succeeded && exception is not null)
{
throw exception;
}
return(move !);
}
public static (bool succeeded, ChessException?exception) TryLoad(string pgn, out ChessBoard?board)
{
board = new();
var headersMatches = Regexes.regexHeaders.Matches(pgn);
if (headersMatches.Count > 0)
{
// Extracting headers
for (int i = 0; i < headersMatches.Count; i++)
{
// [Black "Geras1mleo"]
// Groups[1] = Black
// Groups[2] = Geras1mleo
board.headers.Add(headersMatches[i].Groups[1].Value,
headersMatches[i].Groups[2].Value);
}
}
// San move can occur in header ex. in nickname of player => remove headers from string
pgn = Regexes.regexHeaders.Replace(pgn, "");
// Loading fen if exist
if (board.headers.TryGetValue("FEN", out var fen))
{
var(succeeded, exception) = FenBoardBuilder.TryLoad(fen, out board.FenBuilder);
if (!succeeded)
{
board = null;
return(false, exception);
}
board.pieces = board.FenBuilder.Pieces;
board.HandleKingChecked();
board.HandleEndGame();
if (board.IsEndGame)
{
return(true, null);
}
}
// Remove all alternatives
pgn = Regexes.regexAlternatives.Replace(pgn, "");
// Remove all comments
pgn = Regexes.regexComments.Replace(pgn, "");
// Todo Save Alternative moves(bracnhes) and Comments for moves
var movesMatches = Regexes.regexSanMoves.Matches(pgn);
// Execute all found moves
for (int i = 0; i < movesMatches.Count; i++)
{
var(succeeded, exception) = SanBuilder.TryParse(board, movesMatches[i].Value, out var move, true);
if (!succeeded)
{
board = null;
return(false, exception);
}
// If san parsing succeeded => move is valid
board.executedMoves.Add(move);
board.DropPieceToNewPosition(move);
board.moveIndex = board.executedMoves.Count - 1;
}
board.HandleKingChecked();
board.HandleEndGame();
// If not actual end game but game is in fact ended => someone resigned
if (!board.IsEndGame)
{
if (pgn.Contains("1-0"))
{
board.Resign(PieceColor.Black);
}
else if (pgn.Contains("0-1"))
{
board.Resign(PieceColor.White);
}
else if (pgn.Contains("1/2-1/2"))
{
board.Draw();
}
}
return(true, null);
}
/// <summary>
/// Tries to
/// parse Move object into Standard Algebraic Notation move-string
/// </summary>
/// <param name="move">Move to parse</param>
/// <param name="san">Result with parsed SAN-string</param>
/// <returns>Whether convertion succeeded</returns>
public bool TryParseToSan(Move move, [NotNullWhen(true)] out string?san)
{
return(SanBuilder.TryParse(this, move, out san).succeeded);
}
/// <summary>
/// Tries to
/// parse San-notated move into Move object<br/>
/// Long algebraic notation is also acceptable
/// </summary>
/// <param name="san">San-notated move to parse</param>
/// <param name="move">Result with parsed Move object</param>
/// <param name="resetSan">Whether SAN needs to be regenerated</param>
/// <returns>Whether convert succeeded</returns>
public bool TryParseFromSan(string san, [NotNullWhen(true)] out Move?move, bool resetSan = false)
{
return(SanBuilder.TryParse(this, san, out move, resetSan).succeeded);
}
