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ffishjs.cpp
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ffishjs.cpp
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/*
ffish.js, a JavaScript chess variant library derived from Fairy-Stockfish
Copyright (C) 2022 Fabian Fichter, Johannes Czech
ffish.js is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ffish.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <emscripten.h>
#include <emscripten/bind.h>
#include <vector>
#include <string>
#include <sstream>
#include<iostream>
#include "misc.h"
#include "types.h"
#include "bitboard.h"
#include "evaluate.h"
#include "position.h"
#include "search.h"
#include "syzygy/tbprobe.h"
#include "thread.h"
#include "tt.h"
#include "uci.h"
#include "piece.h"
#include "variant.h"
#include "movegen.h"
#include "apiutil.h"
using namespace emscripten;
using namespace Stockfish;
void initialize_stockfish() {
pieceMap.init();
variants.init();
UCI::init(Options);
Bitboards::init();
Position::init();
Bitbases::init();
}
#define DELIM " "
inline void save_pop_back(std::string& s) {
if (s.size() != 0) {
s.pop_back();
}
}
const Variant* get_variant(const std::string& uciVariant) {
if (uciVariant.size() == 0 || uciVariant == "Standard" || uciVariant == "standard")
return variants.find("chess")->second;
return variants.find(uciVariant)->second;
}
template <bool isUCI>
inline bool is_move_none(Move move, const std::string& strMove, const Position& pos) {
if (move == MOVE_NONE) {
std::cerr << "The given ";
isUCI ? std::cerr << "uciMove" : std::cerr << "sanMove";
std::cerr << " '" << strMove << "' for position '" << pos.fen() << "' is invalid." << std::endl;
return true;
}
return false;
}
class Board {
// note: we can't use references for strings here due to conversion to JavaScript
private:
const Variant* v;
StateListPtr states;
Position pos;
Thread* thread;
std::vector<Move> moveStack;
bool is960;
public:
static bool sfInitialized;
Board():
Board("chess", "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1" , false) {
}
Board(std::string uciVariant):
Board(uciVariant, "", false) {
}
Board(std::string uciVariant, std::string fen):
Board(uciVariant, fen, false) {
}
Board(std::string uciVariant, std::string fen, bool is960) {
init(uciVariant, fen, is960);
}
std::string legal_moves() {
std::string moves;
for (const ExtMove& move : MoveList<LEGAL>(this->pos)) {
moves += UCI::move(this->pos, move);
moves += DELIM;
}
save_pop_back(moves);
return moves;
}
std::string legal_moves_san() {
std::string movesSan;
for (const ExtMove& move : MoveList<LEGAL>(this->pos)) {
movesSan += SAN::move_to_san(this->pos, move, NOTATION_SAN);
movesSan += DELIM;
}
save_pop_back(movesSan);
return movesSan;
}
int number_legal_moves() const {
return MoveList<LEGAL>(pos).size();
}
bool push(std::string uciMove) {
const Move move = UCI::to_move(this->pos, uciMove);
if (is_move_none<true>(move, uciMove, pos))
return false;
do_move(move);
return true;
}
bool push_san(std::string sanMove) {
return push_san(sanMove, NOTATION_SAN);
}
// TODO: This is a naive implementation which compares all legal SAN moves with the requested string.
// If the SAN move wasn't found the position remains unchanged. Alternatively, implement a direct conversion.
bool push_san(std::string sanMove, Notation notation) {
Move foundMove = MOVE_NONE;
for (const ExtMove& move : MoveList<LEGAL>(pos)) {
if (sanMove == SAN::move_to_san(this->pos, move, notation)) {
foundMove = move;
break;
}
}
if (is_move_none<false>(foundMove, sanMove, pos))
return false;
do_move(foundMove);
return true;
}
void pop() {
pos.undo_move(this->moveStack.back());
moveStack.pop_back();
states->pop_back();
}
void reset() {
set_fen(v->startFen);
}
bool is_960() const {
return is960;
}
std::string fen() const {
return this->pos.fen();
}
std::string fen(bool showPromoted) const {
return this->pos.fen(false, showPromoted);
}
std::string fen(bool showPromoted, int countStarted) const {
return this->pos.fen(false, showPromoted, countStarted);
}
void set_fen(std::string fen) {
resetStates();
moveStack.clear();
pos.set(v, fen, is960, &states->back(), thread);
}
// note: const identifier for pos not possible due to SAN::move_to_san()
std::string san_move(std::string uciMove) {
return san_move(uciMove, NOTATION_SAN);
}
std::string san_move(std::string uciMove, Notation notation) {
const Move move = UCI::to_move(this->pos, uciMove);
if (is_move_none<true>(move, uciMove, pos))
return "";
return SAN::move_to_san(this->pos, UCI::to_move(this->pos, uciMove), notation);
}
std::string variation_san(std::string uciMoves) {
return variation_san(uciMoves, NOTATION_SAN, true);
}
std::string variation_san(std::string uciMoves, Notation notation) {
return variation_san(uciMoves, notation, true);
}
std::string variation_san(std::string uciMoves, Notation notation, bool moveNumbers) {
std::stringstream ss(uciMoves);
StateListPtr tempStates;
std::vector<Move> moves;
std::string variationSan = "";
std::string uciMove;
bool first = true;
while (std::getline(ss, uciMove, ' ')) {
const Move move = UCI::to_move(this->pos, uciMove);
if (is_move_none<true>(move, uciMove, pos))
return "";
moves.emplace_back(UCI::to_move(this->pos, uciMove));
if (first) {
first = false;
if (moveNumbers) {
variationSan = std::to_string(fullmove_number());
if (pos.side_to_move() == WHITE)
variationSan += ". ";
else
variationSan += "...";
}
variationSan += SAN::move_to_san(this->pos, moves.back(), Notation(notation));
}
else {
if (moveNumbers && pos.side_to_move() == WHITE) {
variationSan += DELIM;
variationSan += std::to_string(fullmove_number());
variationSan += ".";
}
variationSan += DELIM;
variationSan += SAN::move_to_san(this->pos, moves.back(), Notation(notation));
}
states->emplace_back();
pos.do_move(moves.back(), states->back());
}
// recover initial state
for(auto rIt = std::rbegin(moves); rIt != std::rend(moves); ++rIt) {
pos.undo_move(*rIt);
}
return variationSan;
}
// returns true for WHITE and false for BLACK
bool turn() const {
return !pos.side_to_move();
}
int fullmove_number() const {
return pos.game_ply() / 2 + 1;
}
int halfmove_clock() const {
return pos.rule50_count();
}
int game_ply() const {
return pos.game_ply();
}
bool has_insufficient_material(bool turn) const {
return Stockfish::has_insufficient_material(turn ? WHITE : BLACK, pos);
}
bool is_insufficient_material() const {
return Stockfish::has_insufficient_material(WHITE, pos) && Stockfish::has_insufficient_material(BLACK, pos);
}
bool is_game_over() const {
return is_game_over(false);
}
bool is_game_over(bool claim_draw) const {
if (is_insufficient_material())
return true;
if (claim_draw && pos.is_optional_game_end())
return true;
return MoveList<LEGAL>(pos).size() == 0;
}
std::string result() const {
return result(false);
}
std::string result(bool claim_draw) const {
Value result;
bool gameEnd = pos.is_immediate_game_end(result);
if (!gameEnd) {
if (is_insufficient_material()) {
gameEnd = true;
result = VALUE_DRAW;
}
}
if (!gameEnd && MoveList<LEGAL>(pos).size() == 0) {
gameEnd = true;
result = pos.checkers() ? pos.checkmate_value() : pos.stalemate_value();
}
if (!gameEnd && claim_draw)
gameEnd = pos.is_optional_game_end(result);
if (!gameEnd)
return "*";
if (result == 0) {
if (pos.material_counting())
result = pos.material_counting_result();
if (result == 0)
return "1/2-1/2";
}
if (pos.side_to_move() == BLACK)
result = -result;
if (result > 0)
return "1-0";
else
return "0-1";
}
std::string checked_pieces() const {
Bitboard checked = Stockfish::checked(pos);
std::string squares;
while (checked) {
Square sr = pop_lsb(checked);
squares += UCI::square(pos, sr);
squares += DELIM;
}
save_pop_back(squares);
return squares;
}
bool is_check() const {
return Stockfish::checked(pos);
}
bool is_bikjang() const {
return pos.bikjang();
}
bool is_capture(std::string uciMove) const {
return pos.capture(UCI::to_move(pos, uciMove));
}
std::string move_stack() const {
std::string moves;
for(auto it = std::begin(moveStack); it != std::end(moveStack); ++it) {
moves += UCI::move(pos, *it);
moves += DELIM;
}
save_pop_back(moves);
return moves;
}
void push_moves(std::string uciMoves) {
std::stringstream ss(uciMoves);
std::string uciMove;
while (std::getline(ss, uciMove, ' ')) {
push(uciMove);
}
}
void push_san_moves(std::string sanMoves) {
return push_san_moves(sanMoves, NOTATION_SAN);
}
void push_san_moves(std::string sanMoves, Notation notation) {
std::stringstream ss(sanMoves);
std::string sanMove;
while (std::getline(ss, sanMove, ' '))
push_san(sanMove, notation);
}
std::string pocket(bool color) {
const Color c = Color(!color);
std::string pocket;
for (PieceType pt = KING; pt >= PAWN; --pt) {
for (int i = 0; i < pos.count_in_hand(c, pt); ++i) {
// only create BLACK pieces in order to convert to lower case
pocket += std::string(1, pos.piece_to_char()[make_piece(BLACK, pt)]);
}
}
return pocket;
}
std::string to_string() {
std::string stringBoard;
for (Rank r = pos.max_rank(); r >= RANK_1; --r) {
for (File f = FILE_A; f <= pos.max_file(); ++f) {
if (f != FILE_A)
stringBoard += " ";
const Piece p = pos.piece_on(make_square(f, r));
switch(p) {
case NO_PIECE:
stringBoard += '.';
break;
default:
stringBoard += pos.piece_to_char()[p];
}
}
if (r != RANK_1)
stringBoard += "\n";
}
return stringBoard;
}
std::string to_verbose_string() {
std::stringstream ss;
operator<<(ss, pos);
return ss.str();
}
std::string variant() {
// Iterate through the variants map
for (auto it = variants.begin(); it != variants.end(); ++it)
if (it->second == v)
return it->first;
std::cerr << "Current variant is not registered." << std::endl;
return "unknown";
}
private:
void resetStates() {
this->states = StateListPtr(new std::deque<StateInfo>(1));
}
void do_move(Move move) {
states->emplace_back();
this->pos.do_move(move, states->back());
this->moveStack.emplace_back(move);
}
void init(std::string uciVariant, std::string fen, bool is960) {
if (!Board::sfInitialized) {
initialize_stockfish();
Board::sfInitialized = true;
}
v = get_variant(uciVariant);
UCI::init_variant(v);
this->resetStates();
if (fen == "")
fen = v->startFen;
this->pos.set(this->v, fen, is960, &this->states->back(), this->thread);
this->is960 = is960;
}
};
bool Board::sfInitialized = false;
namespace ffish {
// returns the version of the Fairy-Stockfish binary
std::string info() {
return engine_info();
}
template <typename T>
void set_option(std::string name, T value) {
Options[name] = value;
Board::sfInitialized = false;
}
std::string available_variants() {
std::string availableVariants;
for (std::string variant : variants.get_keys()) {
availableVariants += variant;
availableVariants += DELIM;
}
save_pop_back(availableVariants);
return availableVariants;
}
void load_variant_config(std::string variantInitContent) {
std::stringstream ss(variantInitContent);
if (!Board::sfInitialized)
initialize_stockfish();
variants.parse_istream<false>(ss);
Options["UCI_Variant"].set_combo(variants.get_keys());
Board::sfInitialized = true;
}
bool captures_to_hand(std::string uciVariant) {
const Variant* v = get_variant(uciVariant);
return v->capturesToHand;
}
std::string starting_fen(std::string uciVariant) {
const Variant* v = get_variant(uciVariant);
return v->startFen;
}
int validate_fen(std::string fen, std::string uciVariant, bool chess960) {
const Variant* v = get_variant(uciVariant);
return FEN::validate_fen(fen, v, chess960);
}
int validate_fen(std::string fen, std::string uciVariant) {
return validate_fen(fen, uciVariant, false);
}
int validate_fen(std::string fen) {
return validate_fen(fen, "chess");
}
}
class Game {
private:
std::unordered_map<std::string, std::string> header;
std::unique_ptr<Board> board;
std::string variant = "chess";
std::string fen = ""; // start pos
bool is960 = false;
bool parsedGame = false;
public:
std::string header_keys() {
std::string keys;
for (auto it = header.begin(); it != header.end(); ++it) {
keys += it->first;
keys += DELIM;
}
save_pop_back(keys);
return keys;
}
std::string headers(std::string item) {
auto it = header.find(item);
if (it == header.end())
return "";
return it->second;
}
std::string mainline_moves() {
if (!parsedGame)
return "";
return board->move_stack();
}
friend Game read_game_pgn(std::string);
};
bool skip_comment(const std::string& pgn, size_t& curIdx, size_t& lineEnd) {
curIdx = pgn.find('}', curIdx);
if (curIdx == std::string::npos) {
std::cerr << "Missing '}' for move comment while reading pgn." << std::endl;
return false;
}
if (curIdx > lineEnd)
lineEnd = pgn.find('\n', curIdx);
return true;
}
Game read_game_pgn(std::string pgn) {
Game game;
size_t lineStart = 0;
bool headersParsed = false;
while(true) {
size_t lineEnd = pgn.find('\n', lineStart);
if (lineEnd == std::string::npos)
lineEnd = pgn.size();
if (!headersParsed && pgn[lineStart] == '[') {
// parse header
// look for item
size_t headerKeyStart = lineStart+1;
size_t headerKeyEnd = pgn.find(' ', lineStart);
size_t headerItemStart = pgn.find('"', headerKeyEnd)+1;
size_t headerItemEnd = pgn.find('"', headerItemStart);
// put item into list
game.header[pgn.substr(headerKeyStart, headerKeyEnd-headerKeyStart)] = pgn.substr(headerItemStart, headerItemEnd-headerItemStart);
}
else {
if (!headersParsed) {
headersParsed = true;
auto it = game.header.find("Variant");
if (it != game.header.end()) {
game.is960 = it->second.find("960", it->second.size() - 3) != std::string::npos;
if (game.is960) {
game.variant = it->second.substr(0, it->second.size() - 3);
} else {
game.variant = it->second;
}
std::transform(game.variant.begin(), game.variant.end(), game.variant.begin(),
[](unsigned char c){ return std::tolower(c); });
}
it = game.header.find("FEN");
if (it != game.header.end())
game.fen = it->second;
game.board = std::make_unique<Board>(game.variant, game.fen, game.is960);
game.parsedGame = true;
}
// game line
size_t curIdx = lineStart;
while (curIdx <= lineEnd) {
if (pgn[curIdx] == '*')
return game;
if (pgn[curIdx] == '{') {
if (!skip_comment(pgn, curIdx, lineEnd))
return game;
++curIdx;
}
// Movetext RAV (Recursive Annotation Variation)
size_t openedRAV = 0;
if (pgn[curIdx] == '(') {
openedRAV = 1;
++curIdx;
}
while (openedRAV != 0) {
switch (pgn[curIdx]) {
case '(':
++openedRAV;
break;
case ')':
--openedRAV;
break;
case '{':
if (!skip_comment(pgn, curIdx, lineEnd))
return game;
default: ; // pass
}
++curIdx;
if (curIdx > lineEnd)
lineEnd = pgn.find('\n', curIdx);
}
if (pgn[curIdx] == '$') {
// we are at a glyph
curIdx = pgn.find(' ', curIdx);
}
if (pgn[curIdx] >= '0' && pgn[curIdx] <= '9') {
// we are at a move number -> look for next point
curIdx = pgn.find('.', curIdx);
if (curIdx == std::string::npos)
break;
++curIdx;
// increment if we're at a space
while (curIdx < pgn.size() && pgn[curIdx] == ' ')
++curIdx;
// increment if we're at a point
while (curIdx < pgn.size() && pgn[curIdx] == '.')
++curIdx;
}
// extract sanMove
size_t sanMoveEnd = std::min(pgn.find(' ', curIdx), lineEnd);
if (sanMoveEnd > curIdx) {
std::string sanMove = pgn.substr(curIdx, sanMoveEnd-curIdx);
// clean possible ? and ! from string
size_t annotationChar1 = sanMove.find('?');
size_t annotationChar2 = sanMove.find('!');
if (annotationChar1 != std::string::npos || annotationChar2 != std::string::npos)
sanMove = sanMove.substr(0, std::min(annotationChar1, annotationChar2));
std::cout << sanMove << " ";
game.board->push_san(sanMove);
}
curIdx = sanMoveEnd+1;
}
}
lineStart = lineEnd+1;
if (lineStart >= pgn.size())
return game;
}
return game;
}
// binding code
EMSCRIPTEN_BINDINGS(ffish_js) {
class_<Board>("Board")
.constructor<>()
.constructor<std::string>()
.constructor<std::string, std::string>()
.constructor<std::string, std::string, bool>()
.function("legalMoves", &Board::legal_moves)
.function("legalMovesSan", &Board::legal_moves_san)
.function("numberLegalMoves", &Board::number_legal_moves)
.function("push", &Board::push)
.function("pushSan", select_overload<bool(std::string)>(&Board::push_san))
.function("pushSan", select_overload<bool(std::string, Notation)>(&Board::push_san))
.function("pop", &Board::pop)
.function("reset", &Board::reset)
.function("is960", &Board::is_960)
.function("fen", select_overload<std::string()const>(&Board::fen))
.function("fen", select_overload<std::string(bool)const>(&Board::fen))
.function("fen", select_overload<std::string(bool, int)const>(&Board::fen))
.function("setFen", &Board::set_fen)
.function("sanMove", select_overload<std::string(std::string)>(&Board::san_move))
.function("sanMove", select_overload<std::string(std::string, Notation)>(&Board::san_move))
.function("variationSan", select_overload<std::string(std::string)>(&Board::variation_san))
.function("variationSan", select_overload<std::string(std::string, Notation)>(&Board::variation_san))
.function("variationSan", select_overload<std::string(std::string, Notation, bool)>(&Board::variation_san))
.function("turn", &Board::turn)
.function("fullmoveNumber", &Board::fullmove_number)
.function("halfmoveClock", &Board::halfmove_clock)
.function("gamePly", &Board::game_ply)
.function("hasInsufficientMaterial", &Board::has_insufficient_material)
.function("isInsufficientMaterial", &Board::is_insufficient_material)
.function("isGameOver", select_overload<bool() const>(&Board::is_game_over))
.function("isGameOver", select_overload<bool(bool) const>(&Board::is_game_over))
.function("result", select_overload<std::string() const>(&Board::result))
.function("result", select_overload<std::string(bool) const>(&Board::result))
.function("checkedPieces", &Board::checked_pieces)
.function("isCheck", &Board::is_check)
.function("isBikjang", &Board::is_bikjang)
.function("isCapture", &Board::is_capture)
.function("moveStack", &Board::move_stack)
.function("pushMoves", &Board::push_moves)
.function("pushSanMoves", select_overload<void(std::string)>(&Board::push_san_moves))
.function("pushSanMoves", select_overload<void(std::string, Notation)>(&Board::push_san_moves))
.function("pocket", &Board::pocket)
.function("toString", &Board::to_string)
.function("toVerboseString", &Board::to_verbose_string)
.function("variant", &Board::variant);
class_<Game>("Game")
.function("headerKeys", &Game::header_keys)
.function("headers", &Game::headers)
.function("mainlineMoves", &Game::mainline_moves);
// usage: e.g. ffish.Notation.DEFAULT
enum_<Notation>("Notation")
.value("DEFAULT", NOTATION_DEFAULT)
.value("SAN", NOTATION_SAN)
.value("LAN", NOTATION_LAN)
.value("SHOGI_HOSKING", NOTATION_SHOGI_HOSKING)
.value("SHOGI_HODGES", NOTATION_SHOGI_HODGES)
.value("SHOGI_HODGES_NUMBER", NOTATION_SHOGI_HODGES_NUMBER)
.value("JANGGI", NOTATION_JANGGI)
.value("XIANGQI_WXF", NOTATION_XIANGQI_WXF)
.value("THAI_SAN", NOTATION_THAI_SAN)
.value("THAI_LAN", NOTATION_THAI_LAN);
// usage: e.g. ffish.Termination.CHECKMATE
enum_<Termination>("Termination")
.value("ONGOING", ONGOING)
.value("CHECKMATE", CHECKMATE)
.value("STALEMATE", STALEMATE)
.value("INSUFFICIENT_MATERIAL", INSUFFICIENT_MATERIAL)
.value("N_MOVE_RULE", N_MOVE_RULE)
.value("N_FOLD_REPETITION", N_FOLD_REPETITION)
.value("VARIANT_END", VARIANT_END);
function("info", &ffish::info);
function("setOption", &ffish::set_option<std::string>);
function("setOptionInt", &ffish::set_option<int>);
function("setOptionBool", &ffish::set_option<bool>);
function("readGamePGN", &read_game_pgn);
function("variants", &ffish::available_variants);
function("loadVariantConfig", &ffish::load_variant_config);
function("capturesToHand", &ffish::captures_to_hand);
function("startingFen", &ffish::starting_fen);
function("validateFen", select_overload<int(std::string)>(&ffish::validate_fen));
function("validateFen", select_overload<int(std::string, std::string)>(&ffish::validate_fen));
function("validateFen", select_overload<int(std::string, std::string, bool)>(&ffish::validate_fen));
// TODO: enable to string conversion method
// .class_function("getStringFromInstance", &Board::get_string_from_instance);
}