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                 calc_move_derived_data(move, total_num, data, (move_override % 2 == 0));
 167
 168                 var white = move['white'];
 169                 var draw = move['draw'];
 170                 var black = move['black'];
 171                 var computer = move['computer'];
 172
 173                 line.push(move['move']);  // Move.
 174                 transpose_only.push(move['transpose_only']);
 175                 line.push(move['num']);  // N.
 176                 line.push(move['fraction']);  // %.
 177                 line.push(computer);  // CGames.
 178                 line.push(move['human_index']);  // Hum.
 179                 line.push(move['win_ratio']);  // Win%.
 180
 181                 line.push(white);                // WWin.
 182                 line.push(white / move['num']);  // %WW.
 183                 line.push(black);                // BWin.
 184                 line.push(black / move['num']);  // %BW.
 185                 line.push(draw);                 // Draw.
 186                 line.push(draw / move['num']);   // %Draw.
 187
 188                 if (move['num_elo'] >= 10) {
 189                         // Elo.
 190                         line.push(move['white_avg_elo']);
 191                         line.push(move['black_avg_elo']);
 192                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 193                 } else {
 194                         line.push(null);
 195                         line.push(null);
 196                         line.push(null);
 197                 }
 198
 199                 line.push(move['corrected_win_ratio'] || null);
 200                 lines.push(line);
 201         }
 202
 203         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 204
 205         var tbl = $("#lines");
 206         tbl.empty();
 207
 208         for (var i = 0; i < moves.length; ++i) {
 209                 var line = lines[i];
 210                 var tr = document.createElement("tr");
 211
 212                 if (line[0] === undefined) {
 213                         $(tr).addClass("totals");
 214                 } else if (transpose_only[i]) {
 215                         $(tr).addClass("transponly");
 216                 }
 217
 218                 for (var j = 0; j < line.length; ++j) {
 219                         if (line[j] === null) {
 220                                 add_td(tr, "");
 221                         } else if (headings[j][1] == TYPE_MOVE) {
 222                                 var td = document.createElement("td");
 223                                 tr.appendChild(td);
 224                                 $(td).addClass("move");
 225                                 if (line[j] !== undefined) {
 226                                         if (move_override % 2 == 0) {
 227                                                 $(td).text(((move_override / 2) + 1) + ". ");
 228                                         } else {
 229                                                 $(td).text(((move_override / 2) + 0.5) + "…");
 230                                         }
 231                                 }
 232
 233                                 if (line[j] === '1-0' || line[j] === '1/2-1/2' || line[j] === '0-1') {
 234                                         $(td).text($(td).text() + line[j]);
 235                                 } else {
 236                                         var move_a = document.createElement("a");
 237                                         move_a.href = "javascript:make_move('" + line[j] + "')";
 238                                         td.appendChild(move_a);
 239                                         $(move_a).text(line[j]);
 240                                 }
 241                         } else if (headings[j][1] == TYPE_INTEGER) {
 242                                 add_td(tr, line[j] || 0);
 243                         } else if (headings[j][1] == TYPE_FLOAT) {
 244                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 245                                         add_td(tr, '');
 246                                 } else {
 247                                         add_td(tr, line[j].toFixed(1));
 248                                 }
 249                         } else {
 250                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 251                                         add_td(tr, '');
 252                                 } else {
 253                                         add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 254                                 }
 255                         }
 256                 }
 257
 258                 tbl.append(tr);
 259         }
 260 }
 261
 262 var find_total_games = function(moves) {
 263         var total_num = 0;
 264         for (var i = 0; i < moves.length; ++i) {
 265                 var move = moves[i];
 266                 if (move['move']) {
 267                         total_num += move['white'];
 268                         total_num += move['draw'];
 269                         total_num += move['black'];
 270                 }
 271         }
 272         return total_num;
 273 }
 274
 275 var calc_move_derived_data = function(move, total_num, data, is_white) {
 276         var white = move['white'];
 277         var draw = move['draw'];
 278         var black = move['black'];
 279         var computer = move['computer'];
 280
 281         var num = white + draw + black;
 282         move['num'] = num;
 283         move['fraction'] = num / total_num;
 284
 285         // Adjust so that the human index is 50% overall.
 286         var exp = Math.log(0.5) / Math.log(data['computer_games'] / data['total_games']);
 287         move['human_index'] = 1.0 - Math.pow(computer / num, exp);
 288
 289         // Win%.
 290         var white_win_ratio = (white + 0.5 * draw) / num;
 291         var win_ratio = is_white ? white_win_ratio : 1.0 - white_win_ratio;
 292         move['win_ratio'] = win_ratio;
 293
 294         if (move['num_elo'] >= 10) {
 295                 // Win% corrected for Elo.
 296                 var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 297                 win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 298                 white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 299                 win_ratio = is_white ? white_win_ratio : 1.0 - white_win_ratio;
 300                 move['corrected_win_ratio'] = win_ratio;
 301         }
 302 };
 303
 304 var set_includetransp = function(value) {
 305         includetransp = value;
 306         update();
 307 }
 308 window['set_includetransp'] = set_includetransp;
 309
 310 var set_flipboard = function(value) {
 311         board.orientation(value ? 'black' : 'white');
 312 }
 313 window['set_flipboard'] = set_flipboard;
 314
 315 var make_move = function(move, do_update) {
 316         var history = game.history({ verbose: true });
 317         if (move_override < history.length && history[move_override].san == move) {
 318                 // User effectively only moved forward in history.
 319                 ++move_override;
 320         } else {
 321                 var moves = game.history();
 322                 // Truncate the history if needed.
 323                 if (move_override < moves.length) {
 324                         game = new Chess();
 325                         for (var i = 0; i < move_override; ++i) {
 326                                 game.move(moves[i]);
 327                         }
 328                         fens.length = move_override;
 329                 }
 330                 game.move(move);
 331                 fens.push(game.fen());
 332                 ++move_override;
 333         }
 334
 335         if (do_update !== false) {
 336                 update();
 337                 window.history.pushState(null, null, get_history_url());
 338         }
 339 }
 340 window['make_move'] = make_move;
 341
 342 var prev_move = function() {
 343         if (move_override > 0) {
 344                 --move_override;
 345                 update();
 346                 window.history.replaceState(null, null, get_history_url());
 347         }
 348 }
 349 window['prev_move'] = prev_move;
 350
 351 var next_move = function() {
 352         if (move_override < game.history().length) {
 353                 ++move_override;
 354                 update();
 355                 window.history.replaceState(null, null, get_history_url());
 356         }
 357 }
 358 window['next_move'] = next_move;
 359
 360 var set_move = function(n, do_update) {
 361         move_override = n;
 362         if (do_update !== false) {
 363                 update();
 364                 window.history.replaceState(null, null, get_history_url());
 365         }
 366 }
 367 window['set_move'] = set_move;
 368
 369 // almost all of this stuff comes from the chessboard.js example page
 370 var onDragStart = function(source, piece, position, orientation) {
 371         var pseudogame = new Chess(current_display_fen());
 372         if (pseudogame.game_over() === true ||
 373             (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
 374             (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
 375                 return false;
 376         }
 377
 378         recommended_move = null;
 379         get_best_dest(pseudogame, source, null, function(src, dest) {
 380                 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
 381                 if (dest !== null) {
 382                         var squareEl = $('#board .square-' + dest);
 383                         squareEl.addClass('highlight1-32417');
 384                         recommended_move = [src, dest];
 385                 }
 386         });
 387 }
 388
 389 var mousedownSquare = function(e) {
 390         reverse_dragging_from = null;
 391         var square = $(this).attr('data-square');
 392
 393         var pseudogame = new Chess(current_display_fen());
 394         if (pseudogame.game_over() === true) {
 395                 return;
 396         }
 397
 398         // If the square is empty, or has a piece of the side not to move,
 399         // we handle it. If not, normal piece dragging will take it.
 400         var position = board.position();
 401         if (!position.hasOwnProperty(square) ||
 402             (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
 403             (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
 404                 reverse_dragging_from = square;
 405                 get_best_dest(pseudogame, null, square, function(src, dest) {
 406                         if (src !== null) {
 407                                 var squareEl = $('#board .square-' + src);
 408                                 squareEl.addClass('highlight1-32417');
 409                                 squareEl = $('#board .square-' + dest);
 410                                 squareEl.addClass('highlight1-32417');
 411                                 recommended_move = [src, dest];
 412                         }
 413                 });
 414         } else {
 415                 recommended_src = null;
 416         }
 417 }
 418
 419 var mouseupSquare = function(e) {
 420         if (reverse_dragging_from === null) {
 421                 return;
 422         }
 423         var source = $(this).attr('data-square');
 424         var target = reverse_dragging_from;
 425         reverse_dragging_from = null;
 426         if (onDrop(source, target) !== 'snapback') {
 427                 onSnapEnd(source, target);
 428         }
 429         $("#board").find('.square-55d63').removeClass('highlight1-32417');
 430 }
 431
 432 var get_best_dest = function(game, source, target, cb) {
 433         var moves = game.moves({ verbose: true });
 434         if (source !== null) {
 435                 moves = moves.filter(function(move) { return move.from == source; });
 436         }
 437         if (target !== null) {
 438                 moves = moves.filter(function(move) { return move.to == target; });
 439         }
 440         if (moves.length == 0) {
 441                 cb(null, null);
 442                 return;
 443         }
 444         if (moves.length == 1) {
 445                 cb(moves[0].from, moves[0].to);
 446                 return;
 447         }
 448
 449         // More than one move. Ask the engine to disambiguate.
 450         var uci_moves = moves.map(function(m) { return m.from + m.to; });
 451         var when_engine_is_ready = function() {
 452                 engine_running = true;
 453                 stockfish.onmessage = function(event) {
 454                         var res = event.data.match(/^bestmove (\S\S)(\S\S)/);
 455                         if (res !== null) {
 456                                 engine_running = false;
 457                                 if (engine_replacement_callback !== null) {
 458                                         // We are no longer interested in this query,
 459                                         // so just discard it and call this other callback.
 460                                         engine_replacement_callback();
 461                                         engine_replacement_callback = null;
 462                                 } else {
 463                                         cb(res[1], res[2]);
 464                                 }
 465                         }
 466                 };
 467                 stockfish.postMessage("position fen " + game.fen());
 468                 stockfish.postMessage("go depth 6 searchmoves " + uci_moves.join(" "));
 469         };
 470         if (engine_running) {
 471                 engine_replacement_callback = when_engine_is_ready;
 472         } else {
 473                 when_engine_is_ready();
 474         }
 475 }
 476
 477 var onDrop = function(source, target) {
 478         if (engine_running) {
 479                 // Snap end before the engine came back.
 480                 // Discard the result when it does.
 481                 engine_replacement_callback = function() {};
 482         }
 483         if (source == target) {
 484                 if (recommended_move === null) {
 485                         return 'snapback';
 486                 } else {
 487                         // Accept the move. It will be changed in onSnapEnd.
 488                         return;
 489                 }
 490         } else {
 491                 // Suggestion not asked for.
 492                 recommended_move = null;
 493         }
 494
 495         // see if the move is legal
 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         // illegal move
 504         if (move === null) return 'snapback';
 505 }
 506
 507 var onSnapEnd = function(source, target) {
 508         if (source == target && recommended_move !== null) {
 509                 source = recommended_move[0];
 510                 target = recommended_move[1];
 511         }
 512         recommended_move = null;
 513         var pseudogame = new Chess(current_display_fen());
 514         var move = pseudogame.move({
 515                 from: source,
 516                 to: target,
 517                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 518         });
 519
 520         make_move(pseudogame.history({ verbose: true }).pop().san);
 521 }
 522
 523 var onpopstate = function() {
 524         var old_moves = game.history({ verbose: true }).map(function(x) { return x.san; });
 525         var new_moves = document.location.search.replace(/^\?/, "").split(",");
 526
 527         if (new_moves.length == 1 && new_moves[0] == "") {
 528                 new_moves = [];
 529         }
 530
 531         var num_shared_moves;
 532         for (num_shared_moves = 0; num_shared_moves < Math.min(old_moves.length, new_moves.length); ++num_shared_moves) {
 533                 if (old_moves[i] != new_moves[i]) {
 534                         break;
 535                 }
 536         }
 537
 538         set_move(num_shared_moves, false);
 539         for (var i = num_shared_moves; i < new_moves.length; ++i) {
 540                 make_move(new_moves[i], false);
 541         }
 542         update();
 543         window.history.replaceState(null, null, get_history_url());
 544 }
 545
 546 var init = function() {
 547         // Create board.
 548         board = new window.ChessBoard('board', {
 549                 draggable: true,
 550                 position: 'start',
 551                 onDragStart: onDragStart,
 552                 onDrop: onDrop,
 553                 onSnapEnd: onSnapEnd
 554         });
 555         $("#board").on('mousedown', '.square-55d63', mousedownSquare);
 556         $("#board").on('mouseup', '.square-55d63', mouseupSquare);
 557
 558         window.onpopstate = onpopstate;
 559         onpopstate();
 560
 561         $(window).keyup(function(event) {
 562                 if (event.which == 39) {
 563                         next_move();
 564                 } else if (event.which == 37) {
 565                         prev_move();
 566                 }
 567         });
 568
 569         // Seemingly the web worker is not started before we send it a message.
 570         stockfish.postMessage("uci");
 571 }
 572
 573 $(document).ready(init);
 574
 575 })();