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0 #ifndef STELLAR_PIECE_H

1 #define STELLAR_PIECE_H

2

3 #include "utils.hpp"

4

5 #include <cctype>

6 #include <exception>

7

8 namespace piece {

9

10 struct Piece {

11 const uint8_t index;

12 const Type type;

13 const Color color;

14 const char code;

15 };

16

17 inline constexpr const Piece table[2][6] = {

18 // clang-format off

19 {

20 { .index = 0, .type = PAWN, .color = WHITE, .code = 'P' },

21 { .index = 1, .type = KNIGHT, .color = WHITE, .code = 'N' },

22 { .index = 2, .type = BISHOP, .color = WHITE, .code = 'B' },

23 { .index = 3, .type = ROOK, .color = WHITE, .code = 'R' },

24 { .index = 4, .type = QUEEN, .color = WHITE, .code = 'Q' },

25 { .index = 5, .type = KING, .color = WHITE, .code = 'K' },

26 }, {

27 { .index = 6, .type = PAWN, .color = BLACK, .code = 'p' },

28 { .index = 7, .type = KNIGHT, .color = BLACK, .code = 'n' },

29 { .index = 8, .type = BISHOP, .color = BLACK, .code = 'b' },

30 { .index = 9, .type = ROOK, .color = BLACK, .code = 'r' },

31 {.index = 10, .type = QUEEN, .color = BLACK, .code = 'q' },

32 {.index = 11, .type = KING, .color = BLACK, .code = 'k' },

33 },

34 // clang-format on

35 };

36

37 inline constexpr const Piece &get(const Type type, const Color color) { return table[color][type]; }

38

39 inline constexpr const char get_code(const Type type, const Color color = BLACK) {

40 return get(type, color).code;

41 }

42

43 inline constexpr const U64 get_index(const Type type, const Color color) { return get(type, color).index; }

44

45 inline constexpr const Piece &get_from_code(const char code) {

46 Color color = isupper(code) ? WHITE : BLACK;

47

48 for (Type type = PAWN; type <= KING; ++type) {

49 const Piece &piece = get(type, color);

50 if (piece.code == code) return piece;

51 }

52

53 throw std::exception();

54 }

55

56 inline constexpr const Piece &get_from_index(const uint8_t index) { return table[index / 6][index % 6]; }

57

58 } // namespace piece

59

60 #endif