getPossibleMovesFromSquareOnBoard method

@override List<Move> getPossibleMovesFromSquareOnBoard(Square square, Board board)

Returns the list of possible moves with this piece from square, including moves that are illegal in current position.

Implementation

@override
List<Move> getPossibleMovesFromSquareOnBoard(
  Square square,
  Board board,
) {
  return isWhite
      ? <Move>[
          // N
          if (square.row + 2 < Board.size) ...[
            // E
            if (square.col - 1 >= 0 &&
                !(board.at(square.row + 2, square.col - 1)?.isWhite ?? false))
              Move(square, Square(square.row + 2, square.col - 1)),
            // W
            if (square.col + 1 < Board.size &&
                !(board.at(square.row + 2, square.col + 1)?.isWhite ?? false))
              Move(square, Square(square.row + 2, square.col + 1)),
          ],
          // E
          if (square.col + 2 < Board.size) ...[
            // S
            if (square.row - 1 >= 0 &&
                !(board.at(square.row - 1, square.col + 2)?.isWhite ?? false))
              Move(square, Square(square.row - 1, square.col + 2)),
            // N
            if (square.row + 1 < Board.size &&
                !(board.at(square.row + 1, square.col + 2)?.isWhite ?? false))
              Move(square, Square(square.row + 1, square.col + 2)),
          ],
          // S
          if (square.row - 2 >= 0) ...[
            // E
            if (square.col - 1 >= 0 &&
                !(board.at(square.row - 2, square.col - 1)?.isWhite ?? false))
              Move(square, Square(square.row - 2, square.col - 1)),
            // W
            if (square.col + 1 < Board.size &&
                !(board.at(square.row - 2, square.col + 1)?.isWhite ?? false))
              Move(square, Square(square.row - 2, square.col + 1)),
          ],
          // W
          if (square.col - 2 >= 0) ...[
            // S
            if (square.row - 1 >= 0 &&
                !(board.at(square.row - 1, square.col - 2)?.isWhite ?? false))
              Move(square, Square(square.row - 1, square.col - 2)),
            // N
            if (square.row + 1 < Board.size &&
                !(board.at(square.row + 1, square.col - 2)?.isWhite ?? false))
              Move(square, Square(square.row + 1, square.col - 2)),
          ],
        ]
      : <Move>[
          // N
          if (square.row + 2 < Board.size) ...[
            // E
            if (square.col - 1 >= 0 &&
                !(board.at(square.row + 2, square.col - 1)?.isBlack ?? false))
              Move(square, Square(square.row + 2, square.col - 1)),
            // W
            if (square.col + 1 < Board.size &&
                !(board.at(square.row + 2, square.col + 1)?.isBlack ?? false))
              Move(square, Square(square.row + 2, square.col + 1)),
          ],
          // E
          if (square.col + 2 < Board.size) ...[
            // S
            if (square.row - 1 >= 0 &&
                !(board.at(square.row - 1, square.col + 2)?.isBlack ?? false))
              Move(square, Square(square.row - 1, square.col + 2)),
            // N
            if (square.row + 1 < Board.size &&
                !(board.at(square.row + 1, square.col + 2)?.isBlack ?? false))
              Move(square, Square(square.row + 1, square.col + 2)),
          ],
          // S
          if (square.row - 2 < Board.size) ...[
            // E
            if (square.col - 1 >= 0 &&
                !(board.at(square.row - 2, square.col - 1)?.isBlack ?? false))
              Move(square, Square(square.row - 2, square.col - 1)),
            // W
            if (square.col + 1 < Board.size &&
                !(board.at(square.row - 2, square.col + 1)?.isBlack ?? false))
              Move(square, Square(square.row - 2, square.col + 1)),
          ],
          // W
          if (square.col - 2 >= 0) ...[
            // S
            if (square.row - 1 >= 0 &&
                !(board.at(square.row - 1, square.col - 2)?.isBlack ?? false))
              Move(square, Square(square.row - 1, square.col - 2)),
            // N
            if (square.row + 1 < Board.size &&
                !(board.at(square.row + 1, square.col - 2)?.isBlack ?? false))
              Move(square, Square(square.row + 1, square.col - 2)),
          ],
        ];
}