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fully support FEN strings now
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This commit is contained in:
Karma Riuk 2025-02-02 23:05:42 +01:00
parent 22acfc5027
commit 84c3af2bb1
3 changed files with 28 additions and 8 deletions
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21
cpp/src/board.cpp
View File

@ -82,6 +82,15 @@ Board Board::setup_fen_position(std::string fen) {
index++; index++;
} }
// -- Half move clock
index = fen.find(' ', index) + 1;
board.n_half_moves =
std::stoi(fen.substr(index, fen.find(' ', index + 1) - index));
// -- Full move number
index = fen.find(' ', index) + 1;
board.n_full_moves = std::stoi(fen.substr(index));
return board; return board;
} }
@ -127,7 +136,7 @@ std::string Board::to_fen() const {
ret += white_to_play ? 'w' : 'b'; ret += white_to_play ? 'w' : 'b';
ret += " "; ret += " ";
// Castling Rights // -- Castling Rights
if (w_castle_rights == CastleSide::NeitherSide if (w_castle_rights == CastleSide::NeitherSide
&& b_castle_rights == CastleSide::NeitherSide) && b_castle_rights == CastleSide::NeitherSide)
ret += '-'; ret += '-';
@ -143,10 +152,18 @@ std::string Board::to_fen() const {
} }
ret += ' '; ret += ' ';
// En passant target // -- En passant target
ret += en_passant_target == -1 ret += en_passant_target == -1
? "-" ? "-"
: Coords::from_index(en_passant_target).to_algebraic(); : Coords::from_index(en_passant_target).to_algebraic();
ret += ' ';
// -- Half move clock
ret += std::to_string(n_half_moves);
ret += ' ';
// -- Full moves number
ret += std::to_string(n_full_moves);
return ret; return ret;
} }

2
cpp/src/board.hpp
View File

@ -16,6 +16,8 @@ struct Board {
int8_t w_castle_rights = CastleSide::NeitherSide; int8_t w_castle_rights = CastleSide::NeitherSide;
int8_t b_castle_rights = CastleSide::NeitherSide; int8_t b_castle_rights = CastleSide::NeitherSide;
int8_t en_passant_target = -1; int8_t en_passant_target = -1;
uint8_t n_half_moves = 0;
uint8_t n_full_moves = 0;
static Board setup_fen_position(std::string fen); static Board setup_fen_position(std::string fen);

13
cpp/tests/fen.cpp
View File

@ -2,21 +2,22 @@
#include "lib.hpp" #include "lib.hpp"
int main() { int main() {
std::string pos = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"; std::string pos =
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen()); ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen());
pos = "r1bk3r/p2pBpNp/n4n2/1p1NP2P/6P1/3P4/P1P1K3/q5b1 b Qk -"; pos = "r1bk3r/p2pBpNp/n4n2/1p1NP2P/6P1/3P4/P1P1K3/q5b1 b Qk - 0 1";
ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen()); ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen());
pos = "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3"; pos = "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1";
ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen()); ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen());
pos = "4k2r/6r1/8/8/8/8/3R4/R3K3 w Qk -"; pos = "4k2r/6r1/8/8/8/8/3R4/R3K3 w Qk - 0 1";
ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen()); ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen());
pos = "8/8/8/4p1K1/2k1P3/8/8/8 b - -"; pos = "8/8/8/4p1K1/2k1P3/8/8/8 b - - 0 1";
ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen()); ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen());
pos = "8/5k2/3p4/1p1Pp2p/pP2Pp1P/P4P1K/8/8 b - -"; pos = "8/5k2/3p4/1p1Pp2p/pP2Pp1P/P4P1K/8/8 b - - 99 50";
ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen()); ASSERT_EQUALS(pos, Board::setup_fen_position(pos).to_fen());
} }