std::string SquareBFSearch::get_best_string()
{
text = std::string();
for (uint32_t index = 0; index < length; ++index)
text += char(ALPH_BEGIN);
std::string best = text;
uint32_t best_res = get_square_number(best);
uint32_t index;
uint32_t cand;
do {
for (index = length; index > 0 && text[index - 1] == ALPH_BEGIN + alph_size - 1; --index)
text[index - 1] = ALPH_BEGIN;
if (index > 0) {
cand = get_square_number(text);
if (cand > best_res) {
best_res = cand;
best = text;
}
++text[index - 1];
}
} while (index > 0);
return best;
}
/* ----------------------------------------------------------
CHESS_STATE get_chess_state(CHESS_STATE_STR chess_state_str)
purpose: gets a chess state from individual chess state
component strings.
---------------------------------------------------------- */
CHESS_STATE get_chess_state(CHESS_STATE_STR chess_state_str)
{
CHESS_STATE cs = {0};
// parse the piece placement string
cs = set_piece_placement(chess_state_str.piece_placement);
// next move
if (strcmp(chess_state_str.active_color,"w")==0 || strcmp(chess_state_str.active_color,"W")==0)
cs.flg_is_white_move=1;
else
cs.flg_is_white_move=0;
// castling
cs.flg_black_queen_castle = (strstr(chess_state_str.castling_availability,"q")==NULL) ? 0 : 1;
cs.flg_white_queen_castle = (strstr(chess_state_str.castling_availability,"Q")==NULL) ? 0 : 1;
cs.flg_black_king_castle = (strstr(chess_state_str.castling_availability,"k")==NULL) ? 0 : 1;
cs.flg_white_king_castle = (strstr(chess_state_str.castling_availability,"K")==NULL) ? 0 : 1;
// enpassant
if (get_square_number(chess_state_str.enpassant_square)<0)
cs.flg_is_enpassant=0;
else
{
cs.flg_enpassant_file=COL(get_square_number(chess_state_str.enpassant_square));
if (cs.flg_enpassant_file>=0 && cs.flg_enpassant_file<8)
cs.flg_is_enpassant=1;
}
// halfmove clock
cs.half_move_clock = atoi(chess_state_str.half_move_clock);
// fullmove number
cs.full_move_number = atoi(chess_state_str.full_move_number);
cs.parent=NULL;
cs.child_head=NULL;
cs.next=NULL;
return cs;
}
uint32_t SquareNMCS::sample(const std::string &text)
{
if (length < text.size()) {
std::cerr << "critical error\n";
exit(0);
}
std::string suffix;
while (suffix.size() < length - text.size())
suffix += ALPH_BEGIN + rand() % alph_size;
return get_square_number(text + suffix);
}
