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This commit is contained in:
Lucas Morgan
2024-10-11 11:10:38 -05:00
parent 81dd267290
commit f75553a0ad
14 changed files with 616 additions and 514 deletions
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93
Shogi.Domain/ValueObjects/BoardState.cs
View File

@@ -95,6 +95,92 @@ public class BoardState
set => this[Notation.ToBoardNotation(x, y)] = value;
}
/// <summary>
/// Move a piece from a board tile to another board tile ignorant of check or check-mate.
/// If a piece is captured during the move, state will change to reflect that.
/// If a piece should promote during the move, state will change to reflect that.
/// </summary>
/// <param name="fromNotation">The position of the piece being moved expressed in board notation.</param>
/// <param name="toNotation">The target position expressed in board notation.</param>
/// <param name="isPromotionRequested">True if a promotion is expected as a result of this move.</param>
/// <returns>A <see cref="MoveResult" /> describing the success or failure of the move.</returns>
internal MoveResult Move(string fromNotation, string toNotation, bool isPromotionRequested = false)
{
var from = Notation.FromBoardNotation(fromNotation);
var to = Notation.FromBoardNotation(toNotation);
if (this[toNotation] != null)
{
Capture(to);
}
var fromPiece = this[fromNotation]
?? throw new InvalidOperationException($"No piece exists at position {fromNotation}.");
if (isPromotionRequested &&
(IsWithinPromotionZone(to) || IsWithinPromotionZone(from)))
{
fromPiece.Promote();
}
this[toNotation] = fromPiece;
this[fromNotation] = null;
PreviousMove = new Move(from, to);
var otherPlayer = WhoseTurn == WhichPlayer.Player1 ? WhichPlayer.Player2 : WhichPlayer.Player1;
WhoseTurn = otherPlayer;
return new MoveResult(true);
}
/// Move a piece from the hand to the board ignorant of check or check-mate.
/// </summary>
/// <param name="pieceInHand"></param>
/// <param name="to">The target position expressed in board notation.</param>
/// <returns>A <see cref="MoveResult" /> describing the success or failure of the simulation.</returns>
internal MoveResult Move(WhichPiece pieceInHand, string toNotation)
{
var index = ActivePlayerHand.FindIndex(p => p.WhichPiece == pieceInHand);
if (index == -1)
{
return new MoveResult(false, $"{pieceInHand} does not exist in the hand.");
}
if (this[toNotation] != null)
{
return new MoveResult(false, "Illegal move - attempting to capture while playing a piece from the hand.");
}
var to = Notation.FromBoardNotation(toNotation);
switch (pieceInHand)
{
case WhichPiece.Knight:
{
// Knight cannot be placed onto the farthest two ranks from the hand.
if (WhoseTurn == WhichPlayer.Player1 && to.Y > 6
|| WhoseTurn == WhichPlayer.Player2 && to.Y < 2)
{
return new MoveResult(false, "Knight has no valid moves after placed.");
}
break;
}
case WhichPiece.Lance:
case WhichPiece.Pawn:
{
// Lance and Pawn cannot be placed onto the farthest rank from the hand.
if (WhoseTurn == WhichPlayer.Player1 && to.Y == 8
|| WhoseTurn == WhichPlayer.Player2 && to.Y == 0)
{
return new MoveResult(false, $"{pieceInHand} has no valid moves after placed.");
}
break;
}
}
// Mutate the board.
this[toNotation] = ActivePlayerHand[index];
ActivePlayerHand.RemoveAt(index);
PreviousMove = new Move(pieceInHand, to);
return new MoveResult(true);
}
/// <summary>
/// Returns true if the given path can be traversed without colliding into a piece.
/// </summary>
@@ -107,8 +193,6 @@ public class BoardState
internal bool IsWithinPromotionZone(Vector2 position)
{
// TODO: Move this promotion zone logic into the StandardRules class.
return WhoseTurn == WhichPlayer.Player1 && position.Y > 5
|| WhoseTurn == WhichPlayer.Player2 && position.Y < 3;
@@ -127,9 +211,8 @@ public class BoardState
internal void Capture(Vector2 to)
{
var piece = this[to];
if (piece == null) throw new InvalidOperationException("Cannot capture. Piece at position does not exist.");
var piece = this[to]
?? throw new InvalidOperationException("Cannot capture. Piece at position does not exist.");
piece.Capture(WhoseTurn);
ActivePlayerHand.Add(piece);
}

45
Shogi.Domain/ValueObjects/GoldGeneral.cs
View File

@@ -1,31 +1,30 @@
using Shogi.Domain.YetToBeAssimilatedIntoDDD.Pathing;
using System.Collections.ObjectModel;
namespace Shogi.Domain.ValueObjects
namespace Shogi.Domain.ValueObjects;
internal record class GoldGeneral : Piece
{
internal record class GoldGeneral : Piece
{
public static readonly ReadOnlyCollection<Path> Player1Paths = new(new List<Path>(6)
{
new Path(Direction.Forward),
new Path(Direction.ForwardLeft),
new Path(Direction.ForwardRight),
new Path(Direction.Left),
new Path(Direction.Right),
new Path(Direction.Backward)
});
private static readonly ReadOnlyCollection<Path> Player1Paths = new(new List<Path>(6)
{
new Path(Direction.Forward),
new Path(Direction.ForwardLeft),
new Path(Direction.ForwardRight),
new Path(Direction.Left),
new Path(Direction.Right),
new Path(Direction.Backward)
});
public static readonly ReadOnlyCollection<Path> Player2Paths =
Player1Paths
.Select(p => p.Invert())
.ToList()
.AsReadOnly();
private static readonly ReadOnlyCollection<Path> Player2Paths =
Player1Paths
.Select(p => p.Invert())
.ToList()
.AsReadOnly();
public GoldGeneral(WhichPlayer owner, bool isPromoted = false)
: base(WhichPiece.GoldGeneral, owner, isPromoted)
{
}
public GoldGeneral(WhichPlayer owner, bool isPromoted = false)
: base(WhichPiece.GoldGeneral, owner, isPromoted)
{
}
public override IEnumerable<Path> MoveSet => Owner == WhichPlayer.Player1 ? Player1Paths : Player2Paths;
}
public override IEnumerable<Path> MoveSet => Owner == WhichPlayer.Player1 ? Player1Paths : Player2Paths;
}

43
Shogi.Domain/ValueObjects/King.cs
View File

@@ -1,27 +1,30 @@
using Shogi.Domain.YetToBeAssimilatedIntoDDD.Pathing;
using System.Collections.ObjectModel;
namespace Shogi.Domain.ValueObjects
namespace Shogi.Domain.ValueObjects;
internal record class King : Piece
{
internal record class King : Piece
{
internal static readonly ReadOnlyCollection<Path> KingPaths = new(new List<Path>(8)
{
new Path(Direction.Forward),
new Path(Direction.Left),
new Path(Direction.Right),
new Path(Direction.Backward),
new Path(Direction.ForwardLeft),
new Path(Direction.ForwardRight),
new Path(Direction.BackwardLeft),
new Path(Direction.BackwardRight)
});
private static readonly ReadOnlyCollection<Path> Player1Paths = new(
[
new Path(Direction.Forward),
new Path(Direction.Left),
new Path(Direction.Right),
new Path(Direction.Backward),
new Path(Direction.ForwardLeft),
new Path(Direction.ForwardRight),
new Path(Direction.BackwardLeft),
new Path(Direction.BackwardRight)
]);
private static readonly ReadOnlyCollection<Path> Player2Paths = Player1Paths.Select(p => p.Invert()).ToList().AsReadOnly();
public King(WhichPlayer owner, bool isPromoted = false)
: base(WhichPiece.King, owner, isPromoted)
{
}
public override IEnumerable<Path> MoveSet => Owner == WhichPlayer.Player1 ? Player1Paths : Player2Paths;
public King(WhichPlayer owner, bool isPromoted = false)
: base(WhichPiece.King, owner, isPromoted)
{
}
public override IEnumerable<Path> MoveSet => KingPaths;
}
}

187
Shogi.Domain/ValueObjects/Piece.cs
View File

@@ -1,91 +1,126 @@
using Shogi.Domain.YetToBeAssimilatedIntoDDD.Pathing;
using Shogi.Domain.Other;
using Shogi.Domain.YetToBeAssimilatedIntoDDD.Pathing;
using System.Diagnostics;
namespace Shogi.Domain.ValueObjects
{
[DebuggerDisplay("{WhichPiece} {Owner}")]
public abstract record class Piece
{
public static Piece Create(WhichPiece piece, WhichPlayer owner, bool isPromoted = false)
{
return piece switch
{
WhichPiece.King => new King(owner, isPromoted),
WhichPiece.GoldGeneral => new GoldGeneral(owner, isPromoted),
WhichPiece.SilverGeneral => new SilverGeneral(owner, isPromoted),
WhichPiece.Bishop => new Bishop(owner, isPromoted),
WhichPiece.Rook => new Rook(owner, isPromoted),
WhichPiece.Knight => new Knight(owner, isPromoted),
WhichPiece.Lance => new Lance(owner, isPromoted),
WhichPiece.Pawn => new Pawn(owner, isPromoted),
_ => throw new ArgumentException($"Unknown {nameof(WhichPiece)} when cloning a {nameof(Piece)}.")
};
}
public abstract IEnumerable<Path> MoveSet { get; }
public WhichPiece WhichPiece { get; }
public WhichPlayer Owner { get; private set; }
public bool IsPromoted { get; private set; }
public bool IsUpsideDown => Owner == WhichPlayer.Player2;
[DebuggerDisplay("{WhichPiece} {Owner}")]
public abstract record class Piece : IRulesLifecycle<Piece>
{
public static Piece Create(WhichPiece piece, WhichPlayer owner, bool isPromoted = false)
{
return piece switch
{
WhichPiece.King => new King(owner, isPromoted),
WhichPiece.GoldGeneral => new GoldGeneral(owner, isPromoted),
WhichPiece.SilverGeneral => new SilverGeneral(owner, isPromoted),
WhichPiece.Bishop => new Bishop(owner, isPromoted),
WhichPiece.Rook => new Rook(owner, isPromoted),
WhichPiece.Knight => new Knight(owner, isPromoted),
WhichPiece.Lance => new Lance(owner, isPromoted),
WhichPiece.Pawn => new Pawn(owner, isPromoted),
_ => throw new ArgumentException($"Unknown {nameof(WhichPiece)} when cloning a {nameof(Piece)}.")
};
}
public abstract IEnumerable<Path> MoveSet { get; }
public WhichPiece WhichPiece { get; }
public WhichPlayer Owner { get; private set; }
public bool IsPromoted { get; private set; }
public bool IsUpsideDown => Owner == WhichPlayer.Player2;
protected Piece(WhichPiece piece, WhichPlayer owner, bool isPromoted = false)
{
WhichPiece = piece;
Owner = owner;
IsPromoted = isPromoted;
}
protected Piece(WhichPiece piece, WhichPlayer owner, bool isPromoted = false)
{
WhichPiece = piece;
Owner = owner;
IsPromoted = isPromoted;
}
public bool CanPromote => !IsPromoted
&& WhichPiece != WhichPiece.King
&& WhichPiece != WhichPiece.GoldGeneral;
public bool CanPromote => !IsPromoted
&& WhichPiece != WhichPiece.King
&& WhichPiece != WhichPiece.GoldGeneral;
public void Promote() => IsPromoted = CanPromote;
public void Promote() => IsPromoted = CanPromote;
/// <summary>
/// Prep the piece for capture by changing ownership and demoting.
/// </summary>
public void Capture(WhichPlayer newOwner)
{
Owner = newOwner;
IsPromoted = false;
}
/// <summary>
/// Prep the piece for capture by changing ownership and demoting.
/// </summary>
public void Capture(WhichPlayer newOwner)
{
Owner = newOwner;
IsPromoted = false;
}
/// <summary>
/// Respecting the move-set of the Piece, collect all positions along the shortest path from start to end.
/// Useful if you need to iterate a move-set.
/// </summary>
/// <param name="start"></param>
/// <param name="end"></param>
/// <returns>An empty list if the piece cannot legally traverse from start to end. Otherwise, a list of positions.</returns>
public IEnumerable<Vector2> GetPathFromStartToEnd(Vector2 start, Vector2 end)
{
var steps = new List<Vector2>(10);
/// <summary>
/// Respecting the move-set of the Piece, collect all positions along the shortest path from start to end.
/// Useful if you need to iterate a move-set.
/// </summary>
/// <param name="start"></param>
/// <param name="end"></param>
/// <returns>An empty list if the piece cannot legally traverse from start to end. Otherwise, a list of positions.</returns>
public IEnumerable<Vector2> GetPathFromStartToEnd(Vector2 start, Vector2 end)
{
var steps = new List<Vector2>(10);
var path = MoveSet.GetNearestPath(start, end);
var position = start;
while (Vector2.Distance(start, position) < Vector2.Distance(start, end))
{
position += path.Direction;
steps.Add(position);
var path = MoveSet.GetNearestPath(start, end);
var position = start;
while (Vector2.Distance(start, position) < Vector2.Distance(start, end))
{
position += path.NormalizedDirection;
steps.Add(position);
if (path.Distance == Distance.OneStep) break;
}
if (path.Distance == Distance.OneStep) break;
}
if (position == end)
{
return steps;
}
if (position == end)
{
return steps;
}
return Array.Empty<Vector2>();
}
return Array.Empty<Vector2>();
}
/// <summary>
/// Get all positions this piece could move to from the currentPosition, respecting the move-set of this piece.
/// </summary>
/// <param name="currentPosition"></param>
/// <returns>A list of positions the piece could move to.</returns>
public IEnumerable<Vector2> GetPossiblePositions(Vector2 currentPosition)
{
throw new NotImplementedException();
}
}
#region IRulesLifecycle
public RulesLifecycleResult OnMoveValidation(MoveValidationContext<Piece> ctx)
{
var paths = this.MoveSet;
var matchingPaths = paths.Where(p => p.NormalizedDirection == Vector2.Normalize(ctx.To - ctx.From));
if (!matchingPaths.Any())
{
return new RulesLifecycleResult(IsError: true, "Piece cannot move like that.");
}
var multiStepPaths = matchingPaths.Where(p => p.Distance == Distance.MultiStep).ToArray();
foreach (var path in multiStepPaths)
{
// Assert that no pieces exist along the from -> to path.
var isPathObstructed = GetPositionsAlongPath(ctx.From, ctx.To, path)
.Any(pos => ctx.BoardState[(int)pos.X, (int)pos.Y] != null);
if (isPathObstructed)
{
return new RulesLifecycleResult(IsError: true, "Piece cannot move through other pieces.");
}
}
var pieceAtTo = ctx.BoardState[(int)ctx.To.X, (int)ctx.To.Y];
if (pieceAtTo?.Owner == this.Owner)
{
return new RulesLifecycleResult(IsError: true, "Cannot capture your own pieces.");
}
return new RulesLifecycleResult(IsError: false);
static IEnumerable<Vector2> GetPositionsAlongPath(Vector2 from, Vector2 to, Path path)
{
var next = from;
while (next != to && next.X >= 0 && next.X < 9 && next.Y >= 0 && next.Y < 9)
{
next += path.NormalizedDirection;
yield return next;
}
}
}
#endregion
}
}

436
Shogi.Domain/ValueObjects/ShogiBoard.cs
View File

@@ -1,4 +1,5 @@
using System.Text;
using Shogi.Domain.Other;
using Shogi.Domain.YetToBeAssimilatedIntoDDD;
namespace Shogi.Domain.ValueObjects;
@@ -10,234 +11,257 @@ namespace Shogi.Domain.ValueObjects;
/// </summary>
public sealed class ShogiBoard
{
private readonly StandardRules rules;
private readonly StandardRules rules;
public ShogiBoard(BoardState initialState)
{
BoardState = initialState;
rules = new StandardRules(BoardState);
}
public ShogiBoard(BoardState initialState)
{
BoardState = initialState;
rules = new StandardRules(BoardState);
}
public BoardState BoardState { get; }
public BoardState BoardState { get; }
/// <summary>
/// Move a piece from a board position to another board position, potentially capturing an opponents piece. Respects all rules of the game.
/// </summary>
/// <remarks>
/// The strategy involves simulating a move on a throw-away board state that can be used to
/// validate legal vs illegal moves without having to worry about reverting board state.
/// </remarks>
/// <exception cref="InvalidOperationException"></exception>
public void Move(string from, string to, bool isPromotion)
{
var simulationState = new BoardState(BoardState);
var simulation = new StandardRules(simulationState);
var moveResult = simulation.Move(from, to, isPromotion);
if (!moveResult.Success)
{
throw new InvalidOperationException(moveResult.Reason);
}
/// <summary>
/// Move a piece from a board position to another board position, potentially capturing an opponents piece. Respects all rules of the game.
/// </summary>
/// <remarks>
/// The strategy involves simulating a move on a throw-away board state that can be used to
/// validate legal vs illegal moves without having to worry about reverting board state.
/// </remarks>
/// <exception cref="InvalidOperationException"></exception>
public void Move(string from, string to, bool isPromotion = false)
{
// Validate the move
var rulesState = new Piece?[9, 9];
for (int x = 0; x < 9; x++)
for (int y = 0; y < 9; y++)
{
rulesState[x, y] = this.BoardState[x, y];
}
// If already in check, assert the move that resulted in check no longer results in check.
if (BoardState.InCheck == BoardState.WhoseTurn
&& simulation.IsOpposingKingThreatenedByPosition(BoardState.PreviousMove.To))
{
throw new InvalidOperationException("Unable to move because you are still in check.");
}
var rules = new BoardRules<Piece>(rulesState);
var validationResult = rules.ValidateMove(Notation.FromBoardNotation(from), Notation.FromBoardNotation(to), isPromotion);
if (validationResult.IsError)
{
throw new InvalidOperationException(validationResult.ResultMessage);
}
if (simulation.DidPlayerPutThemselfInCheck())
{
throw new InvalidOperationException("Illegal move. This move places you in check.");
}
// Move is valid, but is it legal?
// Check for correct player's turn.
if (BoardState.WhoseTurn != BoardState[from]!.Owner)
{
throw new InvalidOperationException("Not allowed to move the opponent's pieces.");
}
var otherPlayer = BoardState.WhoseTurn == WhichPlayer.Player1
? WhichPlayer.Player2
: WhichPlayer.Player1;
_ = rules.Move(from, to, isPromotion);
if (rules.IsOpponentInCheckAfterMove())
{
BoardState.InCheck = otherPlayer;
if (rules.IsOpponentInCheckMate())
{
BoardState.IsCheckmate = true;
}
}
else
{
BoardState.InCheck = null;
}
BoardState.WhoseTurn = otherPlayer;
}
// Simulate the move on a throw -away state and look for "check" and "check-mate".
var simulationState = new BoardState(BoardState);
var moveResult = simulationState.Move(from, to, isPromotion);
if (!moveResult.Success)
{
throw new InvalidOperationException(moveResult.Reason);
}
public void Move(WhichPiece pieceInHand, string to)
{
var index = BoardState.ActivePlayerHand.FindIndex(p => p.WhichPiece == pieceInHand);
if (index == -1)
{
throw new InvalidOperationException($"{pieceInHand} does not exist in the hand.");
}
var simulation = new StandardRules(simulationState);
// If already in check, assert the move that resulted in check no longer results in check.
if (BoardState.InCheck == BoardState.WhoseTurn
&& simulation.IsOpposingKingThreatenedByPosition(BoardState.PreviousMove.To))
{
throw new InvalidOperationException("Unable to move because you are still in check.");
}
if (BoardState[to] != null)
{
throw new InvalidOperationException("Illegal placement of piece from the hand. Destination is not empty.");
}
if (simulation.DidPlayerPutThemselfInCheck())
{
throw new InvalidOperationException("Illegal move. This move places you in check.");
}
var toVector = Notation.FromBoardNotation(to);
switch (pieceInHand)
{
case WhichPiece.Knight:
{
// Knight cannot be placed onto the farthest two ranks from the hand.
if (BoardState.WhoseTurn == WhichPlayer.Player1 && toVector.Y > 6
|| BoardState.WhoseTurn == WhichPlayer.Player2 && toVector.Y < 2)
{
throw new InvalidOperationException("Illegal move. Knight has no valid moves after placement.");
}
break;
}
case WhichPiece.Lance:
case WhichPiece.Pawn:
{
// Lance and Pawn cannot be placed onto the farthest rank from the hand.
if (BoardState.WhoseTurn == WhichPlayer.Player1 && toVector.Y == 8
|| BoardState.WhoseTurn == WhichPlayer.Player2 && toVector.Y == 0)
{
throw new InvalidOperationException($"Illegal move. {pieceInHand} has no valid moves after placement.");
}
break;
}
}
var otherPlayer = BoardState.WhoseTurn == WhichPlayer.Player1
? WhichPlayer.Player2
: WhichPlayer.Player1;
_ = BoardState.Move(from, to, isPromotion); // "Rules" should not be doing any data changes. "State" should do that.
if (rules.IsOpponentInCheckAfterMove())
{
BoardState.InCheck = otherPlayer;
if (rules.IsOpponentInCheckMate())
{
BoardState.IsCheckmate = true;
}
}
else
{
BoardState.InCheck = null;
}
BoardState.WhoseTurn = otherPlayer;
}
var tempBoard = new BoardState(BoardState);
var simulation = new StandardRules(tempBoard);
var moveResult = simulation.Move(pieceInHand, to);
if (!moveResult.Success)
{
throw new InvalidOperationException(moveResult.Reason);
}
public void Move(WhichPiece pieceInHand, string to)
{
var index = BoardState.ActivePlayerHand.FindIndex(p => p.WhichPiece == pieceInHand);
if (index == -1)
{
throw new InvalidOperationException($"{pieceInHand} does not exist in the hand.");
}
// If already in check, assert the move that resulted in check no longer results in check.
if (BoardState.InCheck == BoardState.WhoseTurn
&& simulation.IsOpposingKingThreatenedByPosition(BoardState.PreviousMove.To))
{
throw new InvalidOperationException("Unable to drop piece becauase you are still in check.");
}
if (BoardState[to] != null)
{
throw new InvalidOperationException("Illegal placement of piece from the hand. Destination is not empty.");
}
if (simulation.DidPlayerPutThemselfInCheck())
{
throw new InvalidOperationException("Illegal move. This move places you in check.");
}
var toVector = Notation.FromBoardNotation(to);
switch (pieceInHand)
{
case WhichPiece.Knight:
{
// Knight cannot be placed onto the farthest two ranks from the hand.
if (BoardState.WhoseTurn == WhichPlayer.Player1 && toVector.Y > 6
|| BoardState.WhoseTurn == WhichPlayer.Player2 && toVector.Y < 2)
{
throw new InvalidOperationException("Illegal move. Knight has no valid moves after placement.");
}
break;
}
case WhichPiece.Lance:
case WhichPiece.Pawn:
{
// Lance and Pawn cannot be placed onto the farthest rank from the hand.
if (BoardState.WhoseTurn == WhichPlayer.Player1 && toVector.Y == 8
|| BoardState.WhoseTurn == WhichPlayer.Player2 && toVector.Y == 0)
{
throw new InvalidOperationException($"Illegal move. {pieceInHand} has no valid moves after placement.");
}
break;
}
}
// Update the non-simulation board.
var otherPlayer = tempBoard.WhoseTurn == WhichPlayer.Player1
? WhichPlayer.Player2
: WhichPlayer.Player1;
_ = rules.Move(pieceInHand, to);
if (rules.IsOpponentInCheckAfterMove())
{
BoardState.InCheck = otherPlayer;
// A pawn, placed from the hand, cannot be the cause of checkmate.
if (rules.IsOpponentInCheckMate() && pieceInHand != WhichPiece.Pawn)
{
BoardState.IsCheckmate = true;
}
}
var tempBoard = new BoardState(BoardState);
var simulation = new StandardRules(tempBoard);
var moveResult = simulation.Move(pieceInHand, to);
if (!moveResult.Success)
{
throw new InvalidOperationException(moveResult.Reason);
}
var kingPosition = otherPlayer == WhichPlayer.Player1
? tempBoard.Player1KingPosition
: tempBoard.Player2KingPosition;
BoardState.WhoseTurn = otherPlayer;
}
// If already in check, assert the move that resulted in check no longer results in check.
if (BoardState.InCheck == BoardState.WhoseTurn
&& simulation.IsOpposingKingThreatenedByPosition(BoardState.PreviousMove.To))
{
throw new InvalidOperationException("Unable to drop piece becauase you are still in check.");
}
/// <summary>
/// Prints a ASCII representation of the board for debugging board state.
/// </summary>
/// <returns></returns>
public string ToStringStateAsAscii()
{
var builder = new StringBuilder();
builder.Append(" ");
builder.Append("Player 2");
builder.AppendLine();
for (var rank = 8; rank >= 0; rank--)
{
// Horizontal line
builder.Append(" - ");
for (var file = 0; file < 8; file++) builder.Append("- - ");
builder.Append("- -");
if (simulation.DidPlayerPutThemselfInCheck())
{
throw new InvalidOperationException("Illegal move. This move places you in check.");
}
// Print Rank ruler.
builder.AppendLine();
builder.Append($"{rank + 1} ");
// Update the non-simulation board.
var otherPlayer = tempBoard.WhoseTurn == WhichPlayer.Player1
? WhichPlayer.Player2
: WhichPlayer.Player1;
_ = rules.Move(pieceInHand, to);
if (rules.IsOpponentInCheckAfterMove())
{
BoardState.InCheck = otherPlayer;
// A pawn, placed from the hand, cannot be the cause of checkmate.
if (rules.IsOpponentInCheckMate() && pieceInHand != WhichPiece.Pawn)
{
BoardState.IsCheckmate = true;
}
}
// Print pieces.
builder.Append(" |");
for (var x = 0; x < 9; x++)
{
var piece = BoardState[x, rank];
if (piece == null)
{
builder.Append(" ");
}
else
{
builder.AppendFormat("{0}", ToAscii(piece));
}
builder.Append('|');
}
builder.AppendLine();
}
var kingPosition = otherPlayer == WhichPlayer.Player1
? tempBoard.Player1KingPosition
: tempBoard.Player2KingPosition;
BoardState.WhoseTurn = otherPlayer;
}
// Horizontal line
builder.Append(" - ");
for (var x = 0; x < 8; x++) builder.Append("- - ");
builder.Append("- -");
builder.AppendLine();
builder.Append(" ");
builder.Append("Player 1");
/// <summary>
/// Prints a ASCII representation of the board for debugging board state.
/// </summary>
/// <returns></returns>
public string ToStringStateAsAscii()
{
var builder = new StringBuilder();
builder.Append(" ");
builder.Append("Player 2");
builder.AppendLine();
for (var rank = 8; rank >= 0; rank--)
{
// Horizontal line
builder.Append(" - ");
for (var file = 0; file < 8; file++) builder.Append("- - ");
builder.Append("- -");
builder.AppendLine();
builder.AppendLine();
// Print File ruler.
builder.Append(" ");
builder.Append(" A B C D E F G H I ");
// Print Rank ruler.
builder.AppendLine();
builder.Append($"{rank + 1} ");
return builder.ToString();
}
// Print pieces.
builder.Append(" |");
for (var x = 0; x < 9; x++)
{
var piece = BoardState[x, rank];
if (piece == null)
{
builder.Append(" ");
}
else
{
builder.AppendFormat("{0}", ToAscii(piece));
}
builder.Append('|');
}
builder.AppendLine();
}
/// <summary>
///
/// </summary>
/// <param name="piece"></param>
/// <returns>
/// A string with three characters.
/// The first character indicates promotion status.
/// The second character indicates piece.
/// The third character indicates ownership.
/// </returns>
private static string ToAscii(Piece piece)
{
var builder = new StringBuilder();
if (piece.IsPromoted) builder.Append('^');
else builder.Append(' ');
// Horizontal line
builder.Append(" - ");
for (var x = 0; x < 8; x++) builder.Append("- - ");
builder.Append("- -");
builder.AppendLine();
builder.Append(" ");
builder.Append("Player 1");
var name = piece.WhichPiece switch
{
WhichPiece.King => "K",
WhichPiece.GoldGeneral => "G",
WhichPiece.SilverGeneral => "S",
WhichPiece.Bishop => "B",
WhichPiece.Rook => "R",
WhichPiece.Knight => "k",
WhichPiece.Lance => "L",
WhichPiece.Pawn => "P",
_ => throw new ArgumentException($"Unknown value for {nameof(WhichPiece)}."),
};
builder.Append(name);
builder.AppendLine();
builder.AppendLine();
// Print File ruler.
builder.Append(" ");
builder.Append(" A B C D E F G H I ");
if (piece.Owner == WhichPlayer.Player2) builder.Append('.');
else builder.Append(' ');
return builder.ToString();
}
return builder.ToString();
}
/// <summary>
///
/// </summary>
/// <param name="piece"></param>
/// <returns>
/// A string with three characters.
/// The first character indicates promotion status.
/// The second character indicates piece.
/// The third character indicates ownership.
/// </returns>
private static string ToAscii(Piece piece)
{
var builder = new StringBuilder();
if (piece.IsPromoted) builder.Append('^');
else builder.Append(' ');
var name = piece.WhichPiece switch
{
WhichPiece.King => "K",
WhichPiece.GoldGeneral => "G",
WhichPiece.SilverGeneral => "S",
WhichPiece.Bishop => "B",
WhichPiece.Rook => "R",
WhichPiece.Knight => "k",
WhichPiece.Lance => "L",
WhichPiece.Pawn => "P",
_ => throw new ArgumentException($"Unknown value for {nameof(WhichPiece)}."),
};
builder.Append(name);
if (piece.Owner == WhichPlayer.Player2) builder.Append('.');
else builder.Append(' ');
return builder.ToString();
}
}

107
Shogi.Domain/ValueObjects/StandardRules.cs
View File

@@ -12,105 +12,6 @@ namespace Shogi.Domain.ValueObjects
boardState = board;
}
/// <summary>
/// Move a piece from a board tile to another board tile ignorant of check or check-mate.
/// </summary>
/// <param name="fromNotation">The position of the piece being moved expressed in board notation.</param>
/// <param name="toNotation">The target position expressed in board notation.</param>
/// <param name="isPromotionRequested">True if a promotion is expected as a result of this move.</param>
/// <returns>A <see cref="MoveResult" /> describing the success or failure of the move.</returns>
internal MoveResult Move(string fromNotation, string toNotation, bool isPromotionRequested = false)
{
var from = Notation.FromBoardNotation(fromNotation);
var to = Notation.FromBoardNotation(toNotation);
var fromPiece = boardState[from];
if (fromPiece == null)
{
return new MoveResult(false, $"Tile [{fromNotation}] is empty. There is no piece to move.");
}
if (fromPiece.Owner != boardState.WhoseTurn)
{
return new MoveResult(false, "Not allowed to move the opponents piece");
}
var path = fromPiece.GetPathFromStartToEnd(from, to);
if (boardState.IsPathBlocked(path))
{
return new MoveResult(false, "Another piece obstructs the desired move.");
}
if (boardState[to] != null)
{
boardState.Capture(to);
}
if (isPromotionRequested && (boardState.IsWithinPromotionZone(to) || boardState.IsWithinPromotionZone(from)))
{
fromPiece.Promote();
}
boardState[to] = fromPiece;
boardState[from] = null;
boardState.PreviousMove = new Move(from, to);
var otherPlayer = boardState.WhoseTurn == WhichPlayer.Player1 ? WhichPlayer.Player2 : WhichPlayer.Player1;
boardState.WhoseTurn = otherPlayer;
return new MoveResult(true);
}
/// Move a piece from the hand to the board ignorant if check or check-mate.
/// </summary>
/// <param name="pieceInHand"></param>
/// <param name="to">The target position expressed in board notation.</param>
/// <returns>A <see cref="MoveResult" /> describing the success or failure of the simulation.</returns>
internal MoveResult Move(WhichPiece pieceInHand, string toNotation)
{
var to = Notation.FromBoardNotation(toNotation);
var index = boardState.ActivePlayerHand.FindIndex(p => p.WhichPiece == pieceInHand);
if (index == -1)
{
return new MoveResult(false, $"{pieceInHand} does not exist in the hand.");
}
if (boardState[to] != null)
{
return new MoveResult(false, "Illegal move - attempting to capture while playing a piece from the hand.");
}
switch (pieceInHand)
{
case WhichPiece.Knight:
{
// Knight cannot be placed onto the farthest two ranks from the hand.
if (boardState.WhoseTurn == WhichPlayer.Player1 && to.Y > 6
|| boardState.WhoseTurn == WhichPlayer.Player2 && to.Y < 2)
{
return new MoveResult(false, "Knight has no valid moves after placed.");
}
break;
}
case WhichPiece.Lance:
case WhichPiece.Pawn:
{
// Lance and Pawn cannot be placed onto the farthest rank from the hand.
if (boardState.WhoseTurn == WhichPlayer.Player1 && to.Y == 8
|| boardState.WhoseTurn == WhichPlayer.Player2 && to.Y == 0)
{
return new MoveResult(false, $"{pieceInHand} has no valid moves after placed.");
}
break;
}
}
// Mutate the board.
boardState[to] = boardState.ActivePlayerHand[index];
boardState.ActivePlayerHand.RemoveAt(index);
boardState.PreviousMove = new Move(pieceInHand, to);
return new MoveResult(true);
}
/// <summary>
/// Determines if the last move put the player who moved in check.
/// </summary>
@@ -238,14 +139,16 @@ namespace Shogi.Domain.ValueObjects
return true;
}
private IList<Vector2> GetPossiblePositionsForKing(WhichPlayer whichPlayer)
private List<Vector2> GetPossiblePositionsForKing(WhichPlayer whichPlayer)
{
var kingPosition = whichPlayer == WhichPlayer.Player1
? boardState.Player1KingPosition
: boardState.Player2KingPosition;
return King.KingPaths
.Select(path => path.Direction + kingPosition)
var paths = boardState[kingPosition]!.MoveSet;
return paths
.Select(path => path.NormalizedDirection + kingPosition)
// Because the king could be on the edge of the board, where some of its paths do not make sense.
.Where(newPosition => newPosition.IsInsideBoardBoundary())
// Where tile at position is empty, meaning the king could move there.
.Where(newPosition => boardState[newPosition] == null)