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#define MOVE(M, c) compose(c, MOVE_CUBE_ ## M)
#define PREMOVE(M, c) compose(MOVE_CUBE_ ## M, c)
STATIC_INLINE bool allowednextmove(uint8_t *, uint8_t);
STATIC_INLINE uint8_t inverse_trans(uint8_t);
STATIC_INLINE uint8_t movebase(uint8_t);
STATIC_INLINE uint8_t moveaxis(uint8_t);
STATIC_INLINE uint32_t disable_moves(uint32_t, uint8_t);
STATIC cube_t move(cube_t, uint8_t);
STATIC cube_t premove(cube_t, uint8_t);
STATIC uint8_t inverse_move(uint8_t);
STATIC void invertmoves(uint8_t *, uint8_t, uint8_t *);
STATIC int readmoves(const char *, int, uint8_t *);
STATIC cube_t applymoves(cube_t, const char *);
STATIC cube_t frommoves(const char *);
#define FOREACH_READMOVE(ARG_BUF, ARG_MOVE, ARG_C, ARG_MAX, \
LABEL_ERROR, ARG_ACTION) \
const char *VAR_B; \
uint8_t VAR_MOVE_NOMOD, VAR_MOD; \
for (VAR_B = ARG_BUF, ARG_C = 0; *VAR_B != '\0'; VAR_B++, ARG_C++) { \
while (*VAR_B == ' ' || *VAR_B == '\t' || *VAR_B == '\n') \
VAR_B++; \
if (*VAR_B == '\0' || ARG_C == ARG_MAX) \
break; \
if ((VAR_MOVE_NOMOD = readmove(*VAR_B)) == UINT8_ERROR) \
goto LABEL_ERROR; \
if ((VAR_MOD = readmodifier(*(VAR_B+1))) != 0) \
VAR_B++; \
ARG_MOVE = VAR_MOVE_NOMOD + VAR_MOD; \
ARG_ACTION \
}
STATIC bool
allowednextmove(uint8_t *moves, uint8_t n)
{
uint8_t base[3], axis[3];
if (n < 2)
return true;
base[0] = movebase(moves[n-1]);
axis[0] = moveaxis(moves[n-1]);
base[1] = movebase(moves[n-2]);
axis[1] = moveaxis(moves[n-2]);
if (base[0] == base[1] || (axis[0] == axis[1] && base[0] < base[1]))
return false;
if (n == 2)
return true;
base[2] = movebase(moves[n-3]);
axis[2] = moveaxis(moves[n-3]);
return axis[1] != axis[2] || base[0] != base[2];
}
STATIC_INLINE uint32_t
disable_moves(uint32_t current_result, uint8_t base_index)
{
return current_result & ~(7 << base_index);
}
STATIC_INLINE uint8_t
inverse_trans(uint8_t t)
{
return inverse_trans_table[t];
}
STATIC_INLINE uint8_t
movebase(uint8_t move)
{
return move / 3;
}
STATIC_INLINE uint8_t
moveaxis(uint8_t move)
{
return move / 6;
}
STATIC cube_t
move(cube_t c, uint8_t m)
{
switch (m) {
case MOVE_U:
return MOVE(U, c);
case MOVE_U2:
return MOVE(U2, c);
case MOVE_U3:
return MOVE(U3, c);
case MOVE_D:
return MOVE(D, c);
case MOVE_D2:
return MOVE(D2, c);
case MOVE_D3:
return MOVE(D3, c);
case MOVE_R:
return MOVE(R, c);
case MOVE_R2:
return MOVE(R2, c);
case MOVE_R3:
return MOVE(R3, c);
case MOVE_L:
return MOVE(L, c);
case MOVE_L2:
return MOVE(L2, c);
case MOVE_L3:
return MOVE(L3, c);
case MOVE_F:
return MOVE(F, c);
case MOVE_F2:
return MOVE(F2, c);
case MOVE_F3:
return MOVE(F3, c);
case MOVE_B:
return MOVE(B, c);
case MOVE_B2:
return MOVE(B2, c);
case MOVE_B3:
return MOVE(B3, c);
default:
LOG("move error, unknown move\n");
return ZERO_CUBE;
}
}
/* Applies the INVERSE of m BEFORE the scramble corresponding to c */
STATIC cube_t
premove(cube_t c, uint8_t m)
{
switch (m) {
case MOVE_U:
return PREMOVE(U3, c);
case MOVE_U2:
return PREMOVE(U2, c);
case MOVE_U3:
return PREMOVE(U, c);
case MOVE_D:
return PREMOVE(D3, c);
case MOVE_D2:
return PREMOVE(D2, c);
case MOVE_D3:
return PREMOVE(D, c);
case MOVE_R:
return PREMOVE(R3, c);
case MOVE_R2:
return PREMOVE(R2, c);
case MOVE_R3:
return PREMOVE(R, c);
case MOVE_L:
return PREMOVE(L3, c);
case MOVE_L2:
return PREMOVE(L2, c);
case MOVE_L3:
return PREMOVE(L, c);
case MOVE_F:
return PREMOVE(F3, c);
case MOVE_F2:
return PREMOVE(F2, c);
case MOVE_F3:
return PREMOVE(F, c);
case MOVE_B:
return PREMOVE(B3, c);
case MOVE_B2:
return PREMOVE(B2, c);
case MOVE_B3:
return PREMOVE(B, c);
default:
LOG("move error, unknown move\n");
return ZERO_CUBE;
}
}
STATIC uint8_t
inverse_move(uint8_t m)
{
return m - 2 * (m % 3) + 2;
}
STATIC void
invertmoves(uint8_t *moves, uint8_t nmoves, uint8_t *ret)
{
uint8_t i;
for (i = 0; i < nmoves; i++)
ret[i] = inverse_move(moves[nmoves - i - 1]);
}
STATIC int
readmoves(const char *buf, int max, uint8_t *ret)
{
uint8_t m;
int c;
FOREACH_READMOVE(buf, m, c, max, readmoves_error,
ret[c] = m;
)
return c;
readmoves_error:
LOG("readmoves error\n");
return -1;
}
STATIC cube_t
applymoves(cube_t cube, const char *buf)
{
int c;
uint8_t m;
DBG_ASSERT(isconsistent(cube), ZERO_CUBE,
"move error: inconsistent cube\n");
FOREACH_READMOVE(buf, m, c, -1, applymoves_error,
cube = move(cube, m);
)
return cube;
applymoves_error:
LOG("applymoves error\n");
return ZERO_CUBE;
}
STATIC cube_t
frommoves(const char *buf)
{
return applymoves(SOLVED_CUBE, buf);
}
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