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// piece.cpp
// includes
#include <cstring>
#include "colour.h"
#include "piece.h"
#include "util.h"
// "constants"
const int PawnMake[ColourNb] = { WhitePawn256, BlackPawn256 };
const int PieceFrom12[12] = {
WhitePawn256, BlackPawn256,
WhiteKnight256, BlackKnight256,
WhiteBishop256, BlackBishop256,
WhiteRook256, BlackRook256,
WhiteQueen256, BlackQueen256,
WhiteKing256, BlackKing256,
};
static const char PieceString[12+1] = "PpNnBbRrQqKk";
const inc_t PawnMoveInc[ColourNb] = {
+16, -16,
};
const inc_t KnightInc[8+1] = {
-33, -31, -18, -14, +14, +18, +31, +33, 0
};
const inc_t BishopInc[4+1] = {
-17, -15, +15, +17, 0
};
const inc_t RookInc[4+1] = {
-16, -1, +1, +16, 0
};
const inc_t QueenInc[8+1] = {
-17, -16, -15, -1, +1, +15, +16, +17, 0
};
const inc_t KingInc[8+1] = {
-17, -16, -15, -1, +1, +15, +16, +17, 0
};
// variables
int PieceTo12[PieceNb];
int PieceOrder[PieceNb];
const inc_t * PieceInc[PieceNb];
// functions
// piece_init()
void piece_init() {
int piece, piece_12;
// PieceTo12[]
for (piece = 0; piece < PieceNb; piece++) PieceTo12[piece] = -1;
for (piece_12 = 0; piece_12 < 12; piece_12++) {
PieceTo12[PieceFrom12[piece_12]] = piece_12;
}
// PieceOrder[]
for (piece = 0; piece < PieceNb; piece++) PieceOrder[piece] = -1;
for (piece_12 = 0; piece_12 < 12; piece_12++) {
PieceOrder[PieceFrom12[piece_12]] = piece_12 >> 1;
}
// PieceInc[]
for (piece = 0; piece < PieceNb; piece++) {
PieceInc[piece] = NULL;
}
PieceInc[WhiteKnight256] = KnightInc;
PieceInc[WhiteBishop256] = BishopInc;
PieceInc[WhiteRook256] = RookInc;
PieceInc[WhiteQueen256] = QueenInc;
PieceInc[WhiteKing256] = KingInc;
PieceInc[BlackKnight256] = KnightInc;
PieceInc[BlackBishop256] = BishopInc;
PieceInc[BlackRook256] = RookInc;
PieceInc[BlackQueen256] = QueenInc;
PieceInc[BlackKing256] = KingInc;
}
// piece_is_ok()
bool piece_is_ok(int piece) {
if (piece < 0 || piece >= PieceNb) return false;
if (PieceTo12[piece] < 0) return false;
return true;
}
// piece_from_12()
int piece_from_12(int piece_12) {
ASSERT(piece_12>=0&&piece_12<12);
return PieceFrom12[piece_12];
}
// piece_to_char()
int piece_to_char(int piece) {
ASSERT(piece_is_ok(piece));
return PieceString[PIECE_TO_12(piece)];
}
// piece_from_char()
int piece_from_char(int c) {
const char *ptr;
ptr = strchr(PieceString,c);
if (ptr == NULL) return PieceNone256;
return piece_from_12(ptr-PieceString);
}
// end of piece.cpp
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