git.sesse.net Git - remoteglot-book/blob - www/js/book.js

   1 (function() {
   2
   3 var board = null;
   4 var game = new Chess();
   5 var fens = [];
   6 var move_override = 0;
   7 var includetransp = true;
   8 var stockfish = new Worker('/js/stockfish.js');
   9 var engine_running = false;
  10 var engine_replacement_callback = null;
  11 var recommended_move = null;
  12 var reverse_dragging_from = null;
  13
  14 var entity_map = {
  15         "&": "&amp;",
  16         "<": "&lt;",
  17         ">": "&gt;",
  18         '"': '&quot;',
  19         "'": '&#39;',
  20 };
  21
  22 function escape_html(string) {
  23         return String(string).replace(/[&<>"']/g, function (s) {
  24                 return entity_map[s];
  25         });
  26 }
  27
  28 var current_display_fen = function() {
  29         if (move_override == 0) {
  30                 return 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1';
  31         } else {
  32                 return fens[move_override - 1];
  33         }
  34 }
  35
  36 var update = function() {
  37         var text = "";
  38         var history = game.history({ verbose: true });
  39         for (var i = 0; i < history.length; ++i) {
  40                 if (i % 2 == 0) {
  41                         text += (i/2 + 1) + ". ";
  42                 }
  43                 if (i + 1 == move_override) {
  44                         text += '<strong>' + history[i].san + '</strong>';
  45                 } else {
  46                         text += '<a href="javascript:set_move(' + (i + 1) + ')">' + history[i].san + '</a>';
  47                 }
  48                 text += " ";
  49         }
  50         $('#gamehistory').html(text);
  51
  52         if (board.fen() != current_display_fen()) {
  53                 board.position(current_display_fen());
  54         }
  55
  56         $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
  57         if (move_override > 0) {
  58                 var last_move = history[move_override - 1];
  59                 var highlight_from = last_move.from;
  60                 var highlight_to = last_move.to;
  61                 $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
  62                 $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
  63         }
  64
  65         fetch_analysis();
  66 }
  67
  68 var get_history_url = function() {
  69         var history = game.history({ verbose: true }).map(function(x) { return x.san; });
  70         history.length = move_override;
  71         return '/?' + history.join(',');
  72 }
  73
  74 var fetch_analysis = function() {
  75         var fen = current_display_fen();
  76         $.ajax({
  77                 url: "/opening-stats.pl?fen=" + encodeURIComponent(fen) +
  78                         ";includetransp=" + (includetransp ? 1 : 0)
  79         }).done(function(data, textstatus, xhr) {
  80                 show_lines(data, game);
  81         });
  82 }
  83
  84 var add_td = function(tr, value) {
  85         var td = document.createElement("td");
  86         tr.appendChild(td);
  87         $(td).addClass("num");
  88         $(td).text(value);
  89 }
  90
  91 var TYPE_MOVE = 0;
  92 var TYPE_INTEGER = 1;
  93 var TYPE_FLOAT = 2;
  94 var TYPE_RATIO = 3;
  95
  96 var headings = [
  97         [ "Move", TYPE_MOVE ],
  98         [ "Games", TYPE_INTEGER ],
  99         [ "%", TYPE_RATIO ],
 100         [ "CGames", TYPE_INTEGER ],
 101         [ "Hum", TYPE_RATIO ],
 102         [ "Win%", TYPE_RATIO ],
 103         [ "WWin", TYPE_INTEGER ],
 104         [ "%WW", TYPE_RATIO ],
 105         [ "Bwin", TYPE_INTEGER ],
 106         [ "%BW", TYPE_RATIO ],
 107         [ "Draw", TYPE_INTEGER ],
 108         [ "Draw%", TYPE_RATIO ],
 109         [ "AvWElo", TYPE_FLOAT ],
 110         [ "AvBElo", TYPE_FLOAT ],
 111         [ "EloVar", TYPE_FLOAT ],
 112         [ "AWin%", TYPE_RATIO ],
 113 ];
 114 var sort_by = 1;
 115 var direction = 1;
 116
 117 var show_lines = function(data, game) {
 118         var moves = data['moves'];
 119         $('#numviewers').text(data['opening']);
 120
 121         if (data['root_game']) {
 122                 var text = escape_html(data['root_game']['white']);
 123                 if (data['root_game']['white_elo']) {
 124                         text += " (" + escape_html(data['root_game']['white_elo']) + ")";
 125                 }
 126                 text += " &ndash; " + escape_html(data['root_game']['black']);
 127                 if (data['root_game']['black_elo']) {
 128                         text += " (" + escape_html(data['root_game']['black_elo']) + ")";
 129                 }
 130                 text += " &nbsp;" + escape_html(data['root_game']['result']).replace(/-/, "&ndash;") + "<br />";
 131                 if (data['root_game']['eco']) {
 132                         text += "[" + escape_html(data['root_game']['eco']) + "] ";
 133                 }
 134                 text += "(" + data['root_game']['moves'] + ") ";
 135                 text += escape_html(data['root_game']['event']) + " &nbsp;" + escape_html(data['root_game']['date']);
 136                 $('#gamesummary').html(text);
 137         }
 138
 139         var total_num = find_total_games(moves);
 140
 141         var headings_tr = $("#headings");
 142         headings_tr.empty();
 143         for (var i = 0; i < headings.length; ++i) {
 144                 var th = document.createElement("th");
 145                 headings_tr.append(th);
 146                 $(th).text(headings[i][0]);
 147                 (function(new_sort_by) {
 148                         $(th).click(function() {
 149                                 if (sort_by == new_sort_by) {
 150                                         direction = -direction;
 151                                 } else {
 152                                         sort_by = new_sort_by;
 153                                         direction = 1;
 154                                 }
 155                                 show_lines(data, game);
 156                         });
 157                 })(i);
 158         }
 159
 160         var lines = [];
 161         var transpose_only = [];
 162         for (var i = 0; i < moves.length; ++i) {
 163                 var move = moves[i];
 164                 var line = [];
 165
 166                 var white = move['white'];
 167                 var draw = move['draw'];
 168                 var black = move['black'];
 169                 var computer = move['computer'];
 170
 171                 line.push(move['move']);  // Move.
 172                 transpose_only.push(move['transpose_only']);
 173                 var num = white + draw + black;
 174                 line.push(num);  // N.
 175                 line.push(num / total_num);  // %.
 176                 line.push(computer);  // CGames.
 177
 178                 // Adjust so that the human index is 50% overall.
 179                 var exp = Math.log(0.5) / Math.log(data['computer_games'] / data['total_games']);
 180                 line.push(1.0 - Math.pow(computer / num, exp));  // Hum.
 181
 182                 // Win%.
 183                 var white_win_ratio = (white + 0.5 * draw) / num;
 184                 var win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 185                 line.push(win_ratio);
 186
 187                 line.push(white);        // WWin.
 188                 line.push(white / num);  // %WW.
 189                 line.push(black);        // BWin.
 190                 line.push(black / num);  // %BW.
 191                 line.push(draw);         // Draw.
 192                 line.push(draw / num);   // %Draw.
 193
 194                 if (move['num_elo'] >= 10) {
 195                         // Elo.
 196                         line.push(move['white_avg_elo']);
 197                         line.push(move['black_avg_elo']);
 198                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 199
 200                         // Win% corrected for Elo.
 201                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 202                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 203                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 204                         win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 205                         line.push(win_ratio);
 206                 } else {
 207                         line.push(null);
 208                         line.push(null);
 209                         line.push(null);
 210                         line.push(null);
 211                 }
 212                 lines.push(line);
 213         }
 214
 215         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 216
 217         var tbl = $("#lines");
 218         tbl.empty();
 219
 220         for (var i = 0; i < moves.length; ++i) {
 221                 var line = lines[i];
 222                 var tr = document.createElement("tr");
 223
 224                 if (line[0] === undefined) {
 225                         $(tr).addClass("totals");
 226                 } else if (transpose_only[i]) {
 227                         $(tr).addClass("transponly");
 228                 }
 229
 230                 for (var j = 0; j < line.length; ++j) {
 231                         if (line[j] === null) {
 232                                 add_td(tr, "");
 233                         } else if (headings[j][1] == TYPE_MOVE) {
 234                                 var td = document.createElement("td");
 235                                 tr.appendChild(td);
 236                                 $(td).addClass("move");
 237                                 if (line[j] !== undefined) {
 238                                         if (move_override % 2 == 0) {
 239                                                 $(td).text(((move_override / 2) + 1) + ". ");
 240                                         } else {
 241                                                 $(td).text(((move_override / 2) + 0.5) + "…");
 242                                         }
 243                                 }
 244
 245                                 if (line[j] === '1-0' || line[j] === '1/2-1/2' || line[j] === '0-1') {
 246                                         $(td).text($(td).text() + line[j]);
 247                                 } else {
 248                                         var move_a = document.createElement("a");
 249                                         move_a.href = "javascript:make_move('" + line[j] + "')";
 250                                         td.appendChild(move_a);
 251                                         $(move_a).text(line[j]);
 252                                 }
 253                         } else if (headings[j][1] == TYPE_INTEGER) {
 254                                 add_td(tr, line[j] || 0);
 255                         } else if (headings[j][1] == TYPE_FLOAT) {
 256                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 257                                         add_td(tr, '');
 258                                 } else {
 259                                         add_td(tr, line[j].toFixed(1));
 260                                 }
 261                         } else {
 262                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 263                                         add_td(tr, '');
 264                                 } else {
 265                                         add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 266                                 }
 267                         }
 268                 }
 269
 270                 tbl.append(tr);
 271         }
 272 }
 273
 274 var find_total_games = function(moves) {
 275         var total_num = 0;
 276         for (var i = 0; i < moves.length; ++i) {
 277                 var move = moves[i];
 278                 if (move['move']) {
 279                         total_num += move['white'];
 280                         total_num += move['draw'];
 281                         total_num += move['black'];
 282                 }
 283         }
 284         return total_num;
 285 }
 286
 287 var set_includetransp = function(value) {
 288         includetransp = value;
 289         update();
 290 }
 291 window['set_includetransp'] = set_includetransp;
 292
 293 var set_flipboard = function(value) {
 294         board.orientation(value ? 'black' : 'white');
 295 }
 296 window['set_flipboard'] = set_flipboard;
 297
 298 var make_move = function(move, do_update) {
 299         var history = game.history({ verbose: true });
 300         if (move_override < history.length && history[move_override].san == move) {
 301                 // User effectively only moved forward in history.
 302                 ++move_override;
 303         } else {
 304                 var moves = game.history();
 305                 // Truncate the history if needed.
 306                 if (move_override < moves.length) {
 307                         game = new Chess();
 308                         for (var i = 0; i < move_override; ++i) {
 309                                 game.move(moves[i]);
 310                         }
 311                         fens.length = move_override;
 312                 }
 313                 game.move(move);
 314                 fens.push(game.fen());
 315                 ++move_override;
 316         }
 317
 318         if (do_update !== false) {
 319                 update();
 320                 window.history.pushState(null, null, get_history_url());
 321         }
 322 }
 323 window['make_move'] = make_move;
 324
 325 var prev_move = function() {
 326         if (move_override > 0) {
 327                 --move_override;
 328                 update();
 329                 window.history.replaceState(null, null, get_history_url());
 330         }
 331 }
 332 window['prev_move'] = prev_move;
 333
 334 var next_move = function() {
 335         if (move_override < game.history().length) {
 336                 ++move_override;
 337                 update();
 338                 window.history.replaceState(null, null, get_history_url());
 339         }
 340 }
 341 window['next_move'] = next_move;
 342
 343 var set_move = function(n, do_update) {
 344         move_override = n;
 345         if (do_update !== false) {
 346                 update();
 347                 window.history.replaceState(null, null, get_history_url());
 348         }
 349 }
 350 window['set_move'] = set_move;
 351
 352 // almost all of this stuff comes from the chessboard.js example page
 353 var onDragStart = function(source, piece, position, orientation) {
 354         var pseudogame = new Chess(current_display_fen());
 355         if (pseudogame.game_over() === true ||
 356             (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
 357             (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
 358                 return false;
 359         }
 360
 361         recommended_move = null;
 362         get_best_dest(pseudogame, source, null, function(src, dest) {
 363                 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
 364                 if (dest !== null) {
 365                         var squareEl = $('#board .square-' + dest);
 366                         squareEl.addClass('highlight1-32417');
 367                         recommended_move = [src, dest];
 368                 }
 369         });
 370 }
 371
 372 var mousedownSquare = function(e) {
 373         reverse_dragging_from = null;
 374         var square = $(this).attr('data-square');
 375
 376         var pseudogame = new Chess(current_display_fen());
 377         if (pseudogame.game_over() === true) {
 378                 return;
 379         }
 380
 381         // If the square is empty, or has a piece of the side not to move,
 382         // we handle it. If not, normal piece dragging will take it.
 383         var position = board.position();
 384         if (!position.hasOwnProperty(square) ||
 385             (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
 386             (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
 387                 reverse_dragging_from = square;
 388                 get_best_dest(pseudogame, null, square, function(src, dest) {
 389                         if (src !== null) {
 390                                 var squareEl = $('#board .square-' + src);
 391                                 squareEl.addClass('highlight1-32417');
 392                                 squareEl = $('#board .square-' + dest);
 393                                 squareEl.addClass('highlight1-32417');
 394                                 recommended_move = [src, dest];
 395                         }
 396                 });
 397         } else {
 398                 recommended_src = null;
 399         }
 400 }
 401
 402 var mouseupSquare = function(e) {
 403         if (reverse_dragging_from === null) {
 404                 return;
 405         }
 406         var source = $(this).attr('data-square');
 407         var target = reverse_dragging_from;
 408         reverse_dragging_from = null;
 409         if (onDrop(source, target) !== 'snapback') {
 410                 onSnapEnd(source, target);
 411         }
 412         $("#board").find('.square-55d63').removeClass('highlight1-32417');
 413 }
 414
 415 var get_best_dest = function(game, source, target, cb) {
 416         var moves = game.moves({ verbose: true });
 417         if (source !== null) {
 418                 moves = moves.filter(function(move) { return move.from == source; });
 419         }
 420         if (target !== null) {
 421                 moves = moves.filter(function(move) { return move.to == target; });
 422         }
 423         if (moves.length == 0) {
 424                 cb(null, null);
 425                 return;
 426         }
 427         if (moves.length == 1) {
 428                 cb(moves[0].from, moves[0].to);
 429                 return;
 430         }
 431
 432         // More than one move. Ask the engine to disambiguate.
 433         var uci_moves = moves.map(function(m) { return m.from + m.to; });
 434         var when_engine_is_ready = function() {
 435                 engine_running = true;
 436                 stockfish.onmessage = function(event) {
 437                         var res = event.data.match(/^bestmove (\S\S)(\S\S)/);
 438                         if (res !== null) {
 439                                 engine_running = false;
 440                                 if (engine_replacement_callback !== null) {
 441                                         // We are no longer interested in this query,
 442                                         // so just discard it and call this other callback.
 443                                         engine_replacement_callback();
 444                                         engine_replacement_callback = null;
 445                                 } else {
 446                                         cb(res[1], res[2]);
 447                                 }
 448                         }
 449                 };
 450                 stockfish.postMessage("position fen " + game.fen());
 451                 stockfish.postMessage("go depth 6 searchmoves " + uci_moves.join(" "));
 452         };
 453         if (engine_running) {
 454                 engine_replacement_callback = when_engine_is_ready;
 455         } else {
 456                 when_engine_is_ready();
 457         }
 458 }
 459
 460 var onDrop = function(source, target) {
 461         if (engine_running) {
 462                 // Snap end before the engine came back.
 463                 // Discard the result when it does.
 464                 engine_replacement_callback = function() {};
 465         }
 466         if (source == target) {
 467                 if (recommended_move === null) {
 468                         return 'snapback';
 469                 } else {
 470                         // Accept the move. It will be changed in onSnapEnd.
 471                         return;
 472                 }
 473         } else {
 474                 // Suggestion not asked for.
 475                 recommended_move = null;
 476         }
 477
 478         // see if the move is legal
 479         var pseudogame = new Chess(current_display_fen());
 480         var move = pseudogame.move({
 481                 from: source,
 482                 to: target,
 483                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 484         });
 485
 486         // illegal move
 487         if (move === null) return 'snapback';
 488 }
 489
 490 var onSnapEnd = function(source, target) {
 491         if (source == target && recommended_move !== null) {
 492                 source = recommended_move[0];
 493                 target = recommended_move[1];
 494         }
 495         recommended_move = null;
 496         var pseudogame = new Chess(current_display_fen());
 497         var move = pseudogame.move({
 498                 from: source,
 499                 to: target,
 500                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 501         });
 502
 503         make_move(pseudogame.history({ verbose: true }).pop().san);
 504 }
 505
 506 var onpopstate = function() {
 507         var old_moves = game.history({ verbose: true }).map(function(x) { return x.san; });
 508         var new_moves = document.location.search.replace(/^\?/, "").split(",");
 509
 510         if (new_moves.length == 1 && new_moves[0] == "") {
 511                 new_moves = [];
 512         }
 513
 514         var num_shared_moves;
 515         for (num_shared_moves = 0; num_shared_moves < Math.min(old_moves.length, new_moves.length); ++num_shared_moves) {
 516                 if (old_moves[i] != new_moves[i]) {
 517                         break;
 518                 }
 519         }
 520
 521         set_move(num_shared_moves, false);
 522         for (var i = num_shared_moves; i < new_moves.length; ++i) {
 523                 make_move(new_moves[i], false);
 524         }
 525         update();
 526         window.history.replaceState(null, null, get_history_url());
 527 }
 528
 529 var init = function() {
 530         // Create board.
 531         board = new window.ChessBoard('board', {
 532                 draggable: true,
 533                 position: 'start',
 534                 onDragStart: onDragStart,
 535                 onDrop: onDrop,
 536                 onSnapEnd: onSnapEnd
 537         });
 538         $("#board").on('mousedown', '.square-55d63', mousedownSquare);
 539         $("#board").on('mouseup', '.square-55d63', mouseupSquare);
 540
 541         window.onpopstate = onpopstate;
 542         onpopstate();
 543
 544         $(window).keyup(function(event) {
 545                 if (event.which == 39) {
 546                         next_move();
 547                 } else if (event.which == 37) {
 548                         prev_move();
 549                 }
 550         });
 551
 552         // Seemingly the web worker is not started before we send it a message.
 553         stockfish.postMessage("uci");
 554 }
 555
 556 $(document).ready(init);
 557
 558 })();