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// piece.c
// includes
#include <string.h>
#include "colour.h"
#include "piece.h"
#include "util.h"
// "constants"
static const uint8 MakePawn[ColourNb] = { PieceNone256, BlackPawn256, WhitePawn256 }; // -BW
static const uint8 PieceFrom12[12] = {
BlackPawn256, WhitePawn256,
BlackKnight256, WhiteKnight256,
BlackBishop256, WhiteBishop256,
BlackRook256, WhiteRook256,
BlackQueen256, WhiteQueen256,
BlackKing256, WhiteKing256,
};
static const char PieceString[12+1] = "pPnNbBrRqQkK";
// variables
static sint8 PieceTo12[256];
// functions
// piece_init()
void piece_init() {
int piece;
for (piece = 0; piece < 256; piece++) PieceTo12[piece] = -1;
for (piece = 0; piece < 12; piece++) {
PieceTo12[PieceFrom12[piece]] = piece;
}
}
// piece_is_ok()
bool piece_is_ok(int piece) {
if (piece < 0 || piece >= 256) return FALSE;
if (PieceTo12[piece] < 0) return FALSE;
return TRUE;
}
// piece_make_pawn()
int piece_make_pawn(int colour) {
ASSERT(colour_is_ok(colour));
return MakePawn[colour];
}
// piece_pawn_opp()
int piece_pawn_opp(int piece) {
ASSERT(piece==BlackPawn256||piece==WhitePawn256);
return piece ^ 15;
}
// piece_colour()
int piece_colour(int piece) {
ASSERT(piece_is_ok(piece));
return piece & 3;
}
// piece_type()
int piece_type(int piece) {
ASSERT(piece_is_ok(piece));
return piece & ~3;
}
// piece_is_pawn()
bool piece_is_pawn(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & PawnFlags) != 0;
}
// piece_is_knight()
bool piece_is_knight(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & KnightFlag) != 0;
}
// piece_is_bishop()
bool piece_is_bishop(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & QueenFlags) == BishopFlag;
}
// piece_is_rook()
bool piece_is_rook(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & QueenFlags) == RookFlag;
}
// piece_is_queen()
bool piece_is_queen(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & QueenFlags) == QueenFlags;
}
// piece_is_king()
bool piece_is_king(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & KingFlag) != 0;
}
// piece_is_slider()
bool piece_is_slider(int piece) {
ASSERT(piece_is_ok(piece));
return (piece & QueenFlags) != 0;
}
// piece_to_12()
int piece_to_12(int piece) {
ASSERT(piece_is_ok(piece));
return PieceTo12[piece];
}
// piece_from_12()
int piece_from_12(int piece) {
ASSERT(piece>=0&&piece<12);
return PieceFrom12[piece];
}
// 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);
}
// char_is_piece()
bool char_is_piece(int c) {
return strchr("PNBRQK",c) != NULL;
}
// end of piece.cpp
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