/// <summary>
/// 解析一条FEN字符串
/// </summary>
/// <param name="str"></param>
public virtual void Parse(string str)
{
string[] note = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
#region 16.1.3.1: Parse piece placement data
int dot = 1;
int index = 0;
string[] row = note[0].Split('/');
if (row.Length != 8)
{
throw new ArgumentException("Invalid board specification, " + row.Length + " ranks are defined, there should be 8.");
}
foreach (string line in row)
{
index = 0;
foreach (char achar in line)
{
if (achar >= '0' && achar <= '9')
{
index += (int)(achar - '0');
}
else
{
if (Enums.ToPieceType(achar) != Enums.PieceType.None)
{
if (index > 7) // This check needed here to avoid overrunning index below under some error conditions.
{
throw new ArgumentException("Invalid board specification, rank " + (dot / 8 + 1) + " has more then 8 items specified.");
}
this.SetByPosition(dot + index, achar);
}
index++;
}
}
if (index == 0) // Allow null lines = /8/
{
index += 8;
}
if (index != 8)
{
throw new ArgumentException("Invalid board specification, rank " + (dot / 8 + 1) + " has " + index + " items specified, there should be 8.");
}
dot += 8;
}
#endregion
#region 16.1.3.2: Parse active color
if (note.Length >= 2)
{
// 16.1.3.2: Parse active color
if (note[1].Length > 0)
{
char colorchar = Char.ToLower(note[1][0]);
if (colorchar.Equals('w') || colorchar.Equals('b'))
{
GameSide = Enums.ToGameSide(colorchar);
}
else
{
throw new ArgumentException("Invalid color designation, use w or b as 2nd field separated by spaces.");
}
if (note[1].Length != 1)
{
throw new ArgumentException("Invalid color designation, 2nd field is " + note[1].Length + " chars long, only 1 allowed.");
}
}
}
#endregion
#region 16.1.3.3: Parse castling availability
if (note.Length >= 3)
{
foreach (char achar in note[2])
{
switch (achar)
{
case 'K':
this.WhiteKingCastlingAvailability = true;
break;
case 'Q':
this.WhiteQueenCastlingAvailability = true;
break;
case 'k':
this.BlackKingCastlingAvailability = true;
break;
case 'q':
this.BlackQueenCastlingAvailability = true;
break;
case '-':
break;
default:
throw new Exception("Invalid castle privileges designation, use: KQkq or -");
}
}
}
#endregion
#region 16.1.3.4: Parse en passant target square such as "e3"
try
{
if (note.Length >= 4)
{
// 16.1.3.4: Parse en passant target square such as "e3"
if (note[3].Length == 2)
{
if (GameSide == Enums.GameSide.White)
{
if (note[3][1] != '6')
{
throw new Exception("Invalid target square for white En passant captures: " + this.EnPassantTargetPosition.ToString());
}
}
else
{
if (note[3][1] != '3')
{
throw new Exception("Invalid target square for black En passant captures: " + this.EnPassantTargetPosition.ToString());
}
}
}
this.EnPassantTargetPosition = Position.Parse(note[3]);
}
}
catch { }
#endregion
#region 16.1.3.5: Parse halfmove clock, count of half-move since last pawn advance or unit capture
try
{
if (note.Length >= 5)
{
// 16.1.3.5: Parse halfmove clock, count of half-move since last pawn advance or unit capture
this.HalfMoveClock = Int16.Parse(note[4]);
}
}
catch { }
#endregion
#region 16.1.3.6: Parse fullmove number, increment after each black move
try
{
if (note.Length >= 6)
{
// 16.1.3.6: Parse fullmove number, increment after each black move
this.FullMoveNumber = Int16.Parse(note[5]);
}
}
catch { }
#endregion
}
public void Parse(string value)
{
#region Starting
if (string.IsNullOrEmpty(value))
{
throw new ArgumentNullException();
}
value = value.Trim();
if (value.Length < 2 || value == "\r\n")
{
throw new ArgumentOutOfRangeException(value);
}
this.Actions.Add(Enums.Action.General);
#endregion
#region 针对尾部标记符进行一些操作,并返回裁剪掉尾部标记符的Value值
foreach (string flagword in Servicer.Flags)
{
if (value.EndsWith(flagword))
{
if (flagword.Equals("+"))//Qh5+
{
this.Actions.Add(Enums.Action.Check);
}
value = value.Substring(0, value.LastIndexOf(flagword));//裁剪掉尾部标记符
break;
}
}
#endregion
bool isMatch = false;
foreach (var item in Servicer.StepRegex)
{
if (item.Second.IsMatch(value))
{
switch (item.First)
{
#region case
case Servicer.AsStep.As_e4:
this.PieceType = Enums.ToPieceType(this.GameSide);
this.TargetPosition = Position.Parse(value);
isMatch = true;
break;
case Servicer.AsStep.As_Rd7:
this.PieceType = Enums.ToPieceType(value[0], this.GameSide);
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_Rxa2:
this.PieceType = Enums.ToPieceType(value[0], this.GameSide);
this.Actions.Add(Enums.Action.Capture);
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_Rbe1:
this.PieceType = Enums.ToPieceType(value[0], this.GameSide);
this.SourceChar = value[1];
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_N1c3:
this.PieceType = Enums.ToPieceType(value[0], this.GameSide);
this.SourceChar = value[1];
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_hxg6:
this.PieceType = Enums.ToPieceType(this.GameSide);
this.SourceChar = value[0];
this.Actions.Add(Enums.Action.Capture);
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_Ngxf6:
this.PieceType = Enums.ToPieceType(value[0], this.GameSide);
this.SourceChar = value[1];
this.Actions.Add(Enums.Action.Capture);
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_R8xf5: //N1c3
this.PieceType = Enums.ToPieceType(value[0], this.GameSide);
this.SourceChar = value[1];
this.Actions.Add(Enums.Action.Capture);
this.TargetPosition = Position.Parse(value.Substring(value.Length - 2));
isMatch = true;
break;
case Servicer.AsStep.As_e8_Q:
this.PieceType = Enums.ToPieceType(this.GameSide);
this.Actions.Add(Enums.ToPromoteAction(value[value.Length - 1]));
this.TargetPosition = Position.Parse(value.Substring(value.Length - 4, 2));
isMatch = true;
break;
case Servicer.AsStep.As_exf8_Q:
this.PieceType = Enums.ToPieceType(this.GameSide);
this.SourceChar = value[0];
this.Actions.Add(Enums.Action.Capture);
this.Actions.Add(Enums.ToPromoteAction(value[value.Length - 1]));
this.TargetPosition = Position.Parse(value.Substring(value.Length - 4, 2));
isMatch = true;
break;
case Servicer.AsStep.As_O_O:
this.PieceType = Enums.PieceType.None;
this.Actions.Add(Enums.Action.KingSideCastling);
isMatch = true;
break;
case Servicer.AsStep.As_O_O_O:
this.PieceType = Enums.PieceType.None;
this.Actions.Add(Enums.Action.QueenSideCastling);
isMatch = true;
break;
#endregion
}
if (isMatch == true)
{
break;
}
}
}
}