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 = 0;
 140         for (var i = 0; i < moves.length; ++i) {
 141                 var move = moves[i];
 142                 if (move['move']) {
 143                         total_num += parseInt(move['white']);
 144                         total_num += parseInt(move['draw']);
 145                         total_num += parseInt(move['black']);
 146                 }
 147         }
 148
 149         var headings_tr = $("#headings");
 150         headings_tr.empty();
 151         for (var i = 0; i < headings.length; ++i) {
 152                 var th = document.createElement("th");
 153                 headings_tr.append(th);
 154                 $(th).text(headings[i][0]);
 155                 (function(new_sort_by) {
 156                         $(th).click(function() {
 157                                 if (sort_by == new_sort_by) {
 158                                         direction = -direction;
 159                                 } else {
 160                                         sort_by = new_sort_by;
 161                                         direction = 1;
 162                                 }
 163                                 show_lines(data, game);
 164                         });
 165                 })(i);
 166         }
 167
 168         var lines = [];
 169         var transpose_only = [];
 170         for (var i = 0; i < moves.length; ++i) {
 171                 var move = moves[i];
 172                 var line = [];
 173
 174                 var white = parseInt(move['white']);
 175                 var draw = parseInt(move['draw']);
 176                 var black = parseInt(move['black']);
 177                 var computer = parseInt(move['computer']);
 178
 179                 line.push(move['move']);  // Move.
 180                 transpose_only.push(move['transpose_only']);
 181                 var num = white + draw + black;
 182                 line.push(num);  // N.
 183                 line.push(num / total_num);  // %.
 184                 line.push(computer);  // CGames.
 185
 186                 // Adjust so that the human index is 50% overall.
 187                 var exp = Math.log(0.5) / Math.log(data['computer_games'] / data['total_games']);
 188                 line.push(1.0 - Math.pow(computer / num, exp));  // Hum.
 189
 190                 // Win%.
 191                 var white_win_ratio = (white + 0.5 * draw) / num;
 192                 var win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 193                 line.push(win_ratio);
 194
 195                 line.push(white);        // WWin.
 196                 line.push(white / num);  // %WW.
 197                 line.push(black);        // BWin.
 198                 line.push(black / num);  // %BW.
 199                 line.push(draw);         // Draw.
 200                 line.push(draw / num);   // %Draw.
 201
 202                 if (move['num_elo'] >= 10) {
 203                         // Elo.
 204                         line.push(move['white_avg_elo']);
 205                         line.push(move['black_avg_elo']);
 206                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 207
 208                         // Win% corrected for Elo.
 209                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 210                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 211                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 212                         win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 213                         line.push(win_ratio);
 214                 } else {
 215                         line.push(null);
 216                         line.push(null);
 217                         line.push(null);
 218                         line.push(null);
 219                 }
 220                 lines.push(line);
 221         }
 222
 223         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 224
 225         var tbl = $("#lines");
 226         tbl.empty();
 227
 228         for (var i = 0; i < moves.length; ++i) {
 229                 var line = lines[i];
 230                 var tr = document.createElement("tr");
 231
 232                 if (line[0] === undefined) {
 233                         $(tr).addClass("totals");
 234                 } else if (transpose_only[i]) {
 235                         $(tr).addClass("transponly");
 236                 }
 237
 238                 for (var j = 0; j < line.length; ++j) {
 239                         if (line[j] === null) {
 240                                 add_td(tr, "");
 241                         } else if (headings[j][1] == TYPE_MOVE) {
 242                                 var td = document.createElement("td");
 243                                 tr.appendChild(td);
 244                                 $(td).addClass("move");
 245                                 if (line[j] !== undefined) {
 246                                         if (move_override % 2 == 0) {
 247                                                 $(td).text(((move_override / 2) + 1) + ". ");
 248                                         } else {
 249                                                 $(td).text(((move_override / 2) + 0.5) + "…");
 250                                         }
 251                                 }
 252
 253                                 if (line[j] === '1-0' || line[j] === '1/2-1/2' || line[j] === '0-1') {
 254                                         $(td).text($(td).text() + line[j]);
 255                                 } else {
 256                                         var move_a = document.createElement("a");
 257                                         move_a.href = "javascript:make_move('" + line[j] + "')";
 258                                         td.appendChild(move_a);
 259                                         $(move_a).text(line[j]);
 260                                 }
 261                         } else if (headings[j][1] == TYPE_INTEGER) {
 262                                 add_td(tr, line[j] || 0);
 263                         } else if (headings[j][1] == TYPE_FLOAT) {
 264                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 265                                         add_td(tr, '');
 266                                 } else {
 267                                         add_td(tr, line[j].toFixed(1));
 268                                 }
 269                         } else {
 270                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 271                                         add_td(tr, '');
 272                                 } else {
 273                                         add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 274                                 }
 275                         }
 276                 }
 277
 278                 tbl.append(tr);
 279         }
 280 }
 281
 282 var set_includetransp = function(value) {
 283         includetransp = value;
 284         update();
 285 }
 286 window['set_includetransp'] = set_includetransp;
 287
 288 var set_flipboard = function(value) {
 289         board.orientation(value ? 'black' : 'white');
 290 }
 291 window['set_flipboard'] = set_flipboard;
 292
 293 var make_move = function(move, do_update) {
 294         var history = game.history({ verbose: true });
 295         if (move_override < history.length && history[move_override].san == move) {
 296                 // User effectively only moved forward in history.
 297                 ++move_override;
 298         } else {
 299                 var moves = game.history();
 300                 // Truncate the history if needed.
 301                 if (move_override < moves.length) {
 302                         game = new Chess();
 303                         for (var i = 0; i < move_override; ++i) {
 304                                 game.move(moves[i]);
 305                         }
 306                         fens.length = move_override;
 307                 }
 308                 game.move(move);
 309                 fens.push(game.fen());
 310                 ++move_override;
 311         }
 312
 313         if (do_update !== false) {
 314                 update();
 315                 window.history.pushState(null, null, get_history_url());
 316         }
 317 }
 318 window['make_move'] = make_move;
 319
 320 var prev_move = function() {
 321         if (move_override > 0) {
 322                 --move_override;
 323                 update();
 324                 window.history.replaceState(null, null, get_history_url());
 325         }
 326 }
 327 window['prev_move'] = prev_move;
 328
 329 var next_move = function() {
 330         if (move_override < game.history().length) {
 331                 ++move_override;
 332                 update();
 333                 window.history.replaceState(null, null, get_history_url());
 334         }
 335 }
 336 window['next_move'] = next_move;
 337
 338 var set_move = function(n, do_update) {
 339         move_override = n;
 340         if (do_update !== false) {
 341                 update();
 342                 window.history.replaceState(null, null, get_history_url());
 343         }
 344 }
 345 window['set_move'] = set_move;
 346
 347 // almost all of this stuff comes from the chessboard.js example page
 348 var onDragStart = function(source, piece, position, orientation) {
 349         var pseudogame = new Chess(current_display_fen());
 350         if (pseudogame.game_over() === true ||
 351             (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
 352             (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
 353                 return false;
 354         }
 355
 356         recommended_move = null;
 357         get_best_dest(pseudogame, source, null, function(src, dest) {
 358                 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
 359                 if (dest !== null) {
 360                         var squareEl = $('#board .square-' + dest);
 361                         squareEl.addClass('highlight1-32417');
 362                         recommended_move = [src, dest];
 363                 }
 364         });
 365 }
 366
 367 var mousedownSquare = function(e) {
 368         reverse_dragging_from = null;
 369         var square = $(this).attr('data-square');
 370
 371         var pseudogame = new Chess(current_display_fen());
 372         if (pseudogame.game_over() === true) {
 373                 return;
 374         }
 375
 376         // If the square is empty, or has a piece of the side not to move,
 377         // we handle it. If not, normal piece dragging will take it.
 378         var position = board.position();
 379         if (!position.hasOwnProperty(square) ||
 380             (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
 381             (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
 382                 reverse_dragging_from = square;
 383                 get_best_dest(pseudogame, null, square, function(src, dest) {
 384                         if (src !== null) {
 385                                 var squareEl = $('#board .square-' + src);
 386                                 squareEl.addClass('highlight1-32417');
 387                                 squareEl = $('#board .square-' + dest);
 388                                 squareEl.addClass('highlight1-32417');
 389                                 recommended_move = [src, dest];
 390                         }
 391                 });
 392         } else {
 393                 recommended_src = null;
 394         }
 395 }
 396
 397 var mouseupSquare = function(e) {
 398         if (reverse_dragging_from === null) {
 399                 return;
 400         }
 401         var source = $(this).attr('data-square');
 402         var target = reverse_dragging_from;
 403         reverse_dragging_from = null;
 404         if (onDrop(source, target) !== 'snapback') {
 405                 onSnapEnd(source, target);
 406         }
 407         $("#board").find('.square-55d63').removeClass('highlight1-32417');
 408 }
 409
 410 var get_best_dest = function(game, source, target, cb) {
 411         var moves = game.moves({ verbose: true });
 412         if (source !== null) {
 413                 moves = moves.filter(function(move) { return move.from == source; });
 414         }
 415         if (target !== null) {
 416                 moves = moves.filter(function(move) { return move.to == target; });
 417         }
 418         if (moves.length == 0) {
 419                 cb(null, null);
 420                 return;
 421         }
 422         if (moves.length == 1) {
 423                 cb(moves[0].from, moves[0].to);
 424                 return;
 425         }
 426
 427         // More than one move. Ask the engine to disambiguate.
 428         var uci_moves = moves.map(function(m) { return m.from + m.to; });
 429         var when_engine_is_ready = function() {
 430                 engine_running = true;
 431                 stockfish.onmessage = function(event) {
 432                         var res = event.data.match(/^bestmove (\S\S)(\S\S)/);
 433                         if (res !== null) {
 434                                 engine_running = false;
 435                                 if (engine_replacement_callback !== null) {
 436                                         // We are no longer interested in this query,
 437                                         // so just discard it and call this other callback.
 438                                         engine_replacement_callback();
 439                                         engine_replacement_callback = null;
 440                                 } else {
 441                                         cb(res[1], res[2]);
 442                                 }
 443                         }
 444                 };
 445                 stockfish.postMessage("position fen " + game.fen());
 446                 stockfish.postMessage("go depth 6 searchmoves " + uci_moves.join(" "));
 447         };
 448         if (engine_running) {
 449                 engine_replacement_callback = when_engine_is_ready;
 450         } else {
 451                 when_engine_is_ready();
 452         }
 453 }
 454
 455 var onDrop = function(source, target) {
 456         if (engine_running) {
 457                 // Snap end before the engine came back.
 458                 // Discard the result when it does.
 459                 engine_replacement_callback = function() {};
 460         }
 461         if (source == target) {
 462                 if (recommended_move === null) {
 463                         return 'snapback';
 464                 } else {
 465                         // Accept the move. It will be changed in onSnapEnd.
 466                         return;
 467                 }
 468         } else {
 469                 // Suggestion not asked for.
 470                 recommended_move = null;
 471         }
 472
 473         // see if the move is legal
 474         var pseudogame = new Chess(current_display_fen());
 475         var move = pseudogame.move({
 476                 from: source,
 477                 to: target,
 478                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 479         });
 480
 481         // illegal move
 482         if (move === null) return 'snapback';
 483 }
 484
 485 var onSnapEnd = function(source, target) {
 486         if (source == target && recommended_move !== null) {
 487                 source = recommended_move[0];
 488                 target = recommended_move[1];
 489         }
 490         recommended_move = null;
 491         var pseudogame = new Chess(current_display_fen());
 492         var move = pseudogame.move({
 493                 from: source,
 494                 to: target,
 495                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 496         });
 497
 498         make_move(pseudogame.history({ verbose: true }).pop().san);
 499 }
 500
 501 var onpopstate = function() {
 502         var old_moves = game.history({ verbose: true }).map(function(x) { return x.san; });
 503         var new_moves = document.location.search.replace(/^\?/, "").split(",");
 504
 505         if (new_moves.length == 1 && new_moves[0] == "") {
 506                 new_moves = [];
 507         }
 508
 509         var num_shared_moves;
 510         for (num_shared_moves = 0; num_shared_moves < Math.min(old_moves.length, new_moves.length); ++num_shared_moves) {
 511                 if (old_moves[i] != new_moves[i]) {
 512                         break;
 513                 }
 514         }
 515
 516         set_move(num_shared_moves, false);
 517         for (var i = num_shared_moves; i < new_moves.length; ++i) {
 518                 make_move(new_moves[i], false);
 519         }
 520         update();
 521         window.history.replaceState(null, null, get_history_url());
 522 }
 523
 524 var init = function() {
 525         // Create board.
 526         board = new window.ChessBoard('board', {
 527                 draggable: true,
 528                 position: 'start',
 529                 onDragStart: onDragStart,
 530                 onDrop: onDrop,
 531                 onSnapEnd: onSnapEnd
 532         });
 533         $("#board").on('mousedown', '.square-55d63', mousedownSquare);
 534         $("#board").on('mouseup', '.square-55d63', mouseupSquare);
 535
 536         window.onpopstate = onpopstate;
 537         onpopstate();
 538
 539         $(window).keyup(function(event) {
 540                 if (event.which == 39) {
 541                         next_move();
 542                 } else if (event.which == 37) {
 543                         prev_move();
 544                 }
 545         });
 546
 547         // Seemingly the web worker is not started before we send it a message.
 548         stockfish.postMessage("uci");
 549 }
 550
 551 $(document).ready(init);
 552
 553 })();