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
   9 var entity_map = {
  10         "&": "&amp;",
  11         "<": "&lt;",
  12         ">": "&gt;",
  13         '"': '&quot;',
  14         "'": '&#39;',
  15 };
  16
  17 function escape_html(string) {
  18         return String(string).replace(/[&<>"']/g, function (s) {
  19                 return entity_map[s];
  20         });
  21 }
  22
  23 var current_display_fen = function() {
  24         if (move_override == 0) {
  25                 return 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1';
  26         } else {
  27                 return fens[move_override - 1];
  28         }
  29 }
  30
  31 var update = function() {
  32         var text = "";
  33         var history = game.history({ verbose: true });
  34         for (var i = 0; i < history.length; ++i) {
  35                 if (i % 2 == 0) {
  36                         text += (i/2 + 1) + ". ";
  37                 }
  38                 if (i + 1 == move_override) {
  39                         text += '<strong>' + history[i].san + '</strong>';
  40                 } else {
  41                         text += '<a href="javascript:set_move(' + (i + 1) + ')">' + history[i].san + '</a>';
  42                 }
  43                 text += " ";
  44         }
  45         $('#gamehistory').html(text);
  46
  47         if (board.fen() != current_display_fen()) {
  48                 board.position(current_display_fen());
  49         }
  50
  51         if (move_override > 0) {
  52                 var last_move = history[move_override - 1];
  53                 var highlight_from = last_move.from;
  54                 var highlight_to = last_move.to;
  55                 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
  56                 $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
  57                 $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
  58         }
  59
  60         fetch_analysis();
  61 }
  62
  63 var get_history_url = function() {
  64         var history = game.history({ verbose: true }).map(function(x) { return x.san; });
  65         history.length = move_override;
  66         return '/?' + history.join(',');
  67 }
  68
  69 var fetch_analysis = function() {
  70         var fen = current_display_fen();
  71         $.ajax({
  72                 url: "/opening-stats.pl?fen=" + encodeURIComponent(fen) +
  73                         ";includetransp=" + (includetransp ? 1 : 0)
  74         }).done(function(data, textstatus, xhr) {
  75                 show_lines(data, game);
  76         });
  77 }
  78
  79 var add_td = function(tr, value) {
  80         var td = document.createElement("td");
  81         tr.appendChild(td);
  82         $(td).addClass("num");
  83         $(td).text(value);
  84 }
  85
  86 var TYPE_MOVE = 0;
  87 var TYPE_INTEGER = 1;
  88 var TYPE_FLOAT = 2;
  89 var TYPE_RATIO = 3;
  90
  91 var headings = [
  92         [ "Move", TYPE_MOVE ],
  93         [ "Games", TYPE_INTEGER ],
  94         [ "%", TYPE_RATIO ],
  95         [ "Win%", TYPE_RATIO ],
  96         [ "WWin", TYPE_INTEGER ],
  97         [ "%WW", TYPE_RATIO ],
  98         [ "Bwin", TYPE_INTEGER ],
  99         [ "%BW", TYPE_RATIO ],
 100         [ "Draw", TYPE_INTEGER ],
 101         [ "Draw%", TYPE_RATIO ],
 102         [ "AvWElo", TYPE_FLOAT ],
 103         [ "AvBElo", TYPE_FLOAT ],
 104         [ "EloVar", TYPE_FLOAT ],
 105         [ "AWin%", TYPE_RATIO ],
 106 ];
 107 var sort_by = 1;
 108 var direction = 1;
 109
 110 var show_lines = function(data, game) {
 111         var moves = data['moves'];
 112         $('#numviewers').text(data['opening']);
 113
 114         if (data['root_game']) {
 115                 var text = escape_html(data['root_game']['white']);
 116                 if (data['root_game']['white_elo']) {
 117                         text += " (" + escape_html(data['root_game']['white_elo']) + ")";
 118                 }
 119                 text += " &ndash; " + escape_html(data['root_game']['black']);
 120                 if (data['root_game']['black_elo']) {
 121                         text += " (" + escape_html(data['root_game']['black_elo']) + ")";
 122                 }
 123                 text += " &nbsp;" + escape_html(data['root_game']['result']).replace(/-/, "&ndash;") + "<br />";
 124                 if (data['root_game']['eco']) {
 125                         text += "[" + escape_html(data['root_game']['eco']) + "] ";
 126                 }
 127                 text += "(" + data['root_game']['moves'] + ") ";
 128                 text += escape_html(data['root_game']['event']) + " &nbsp;" + escape_html(data['root_game']['date']);
 129                 $('#gamesummary').html(text);
 130         }
 131
 132         var total_num = 0;
 133         for (var i = 0; i < moves.length; ++i) {
 134                 var move = moves[i];
 135                 if (move['move']) {
 136                         total_num += parseInt(move['white']);
 137                         total_num += parseInt(move['draw']);
 138                         total_num += parseInt(move['black']);
 139                 }
 140         }
 141
 142         var headings_tr = $("#headings");
 143         headings_tr.empty();
 144         for (var i = 0; i < headings.length; ++i) {
 145                 var th = document.createElement("th");
 146                 headings_tr.append(th);
 147                 $(th).text(headings[i][0]);
 148                 (function(new_sort_by) {
 149                         $(th).click(function() {
 150                                 if (sort_by == new_sort_by) {
 151                                         direction = -direction;
 152                                 } else {
 153                                         sort_by = new_sort_by;
 154                                         direction = 1;
 155                                 }
 156                                 show_lines(data, game);
 157                         });
 158                 })(i);
 159         }
 160
 161         var lines = [];
 162         var transpose_only = [];
 163         for (var i = 0; i < moves.length; ++i) {
 164                 var move = moves[i];
 165                 var line = [];
 166
 167                 var white = parseInt(move['white']);
 168                 var draw = parseInt(move['draw']);
 169                 var black = parseInt(move['black']);
 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
 177                 // Win%.
 178                 var white_win_ratio = (white + 0.5 * draw) / num;
 179                 var win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 180                 line.push(win_ratio);
 181
 182                 line.push(white);        // WWin.
 183                 line.push(white / num);  // %WW.
 184                 line.push(black);        // BWin.
 185                 line.push(black / num);  // %BW.
 186                 line.push(draw);         // Draw.
 187                 line.push(draw / num);   // %Draw.
 188
 189                 if (move['num_elo'] >= 10) {
 190                         // Elo.
 191                         line.push(move['white_avg_elo']);
 192                         line.push(move['black_avg_elo']);
 193                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 194
 195                         // Win% corrected for Elo.
 196                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 197                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 198                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 199                         win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 200                         line.push(win_ratio);
 201                 } else {
 202                         line.push(null);
 203                         line.push(null);
 204                         line.push(null);
 205                         line.push(null);
 206                 }
 207                 lines.push(line);
 208         }
 209
 210         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 211
 212         var tbl = $("#lines");
 213         tbl.empty();
 214
 215         for (var i = 0; i < moves.length; ++i) {
 216                 var line = lines[i];
 217                 var tr = document.createElement("tr");
 218
 219                 if (line[0] === undefined) {
 220                         $(tr).addClass("totals");
 221                 } else if (transpose_only[i]) {
 222                         $(tr).addClass("transponly");
 223                 }
 224
 225                 for (var j = 0; j < line.length; ++j) {
 226                         if (line[j] === null) {
 227                                 add_td(tr, "");
 228                         } else if (headings[j][1] == TYPE_MOVE) {
 229                                 var td = document.createElement("td");
 230                                 tr.appendChild(td);
 231                                 $(td).addClass("move");
 232                                 if (line[j] !== undefined) {
 233                                         if (move_override % 2 == 0) {
 234                                                 $(td).text(((move_override / 2) + 1) + ". ");
 235                                         } else {
 236                                                 $(td).text(((move_override / 2) + 0.5) + "…");
 237                                         }
 238                                 }
 239
 240                                 var move_a = document.createElement("a");
 241                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 242                                 td.appendChild(move_a);
 243                                 $(move_a).text(line[j]);
 244                         } else if (headings[j][1] == TYPE_INTEGER) {
 245                                 add_td(tr, line[j] || 0);
 246                         } else if (headings[j][1] == TYPE_FLOAT) {
 247                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 248                                         add_td(tr, '');
 249                                 } else {
 250                                         add_td(tr, line[j].toFixed(1));
 251                                 }
 252                         } else {
 253                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 254                                         add_td(tr, '');
 255                                 } else {
 256                                         add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 257                                 }
 258                         }
 259                 }
 260
 261                 tbl.append(tr);
 262         }
 263 }
 264
 265 var set_includetransp = function(value) {
 266         includetransp = value;
 267         update();
 268 }
 269 window['set_includetransp'] = set_includetransp;
 270
 271 var make_move = function(move, do_update) {
 272         var history = game.history({ verbose: true });
 273         if (move_override < history.length && history[move_override].san == move) {
 274                 // User effectively only moved forward in history.
 275                 ++move_override;
 276         } else {
 277                 var moves = game.history();
 278                 // Truncate the history if needed.
 279                 if (move_override < moves.length) {
 280                         game = new Chess();
 281                         for (var i = 0; i < move_override; ++i) {
 282                                 game.move(moves[i]);
 283                         }
 284                         fens.length = move_override;
 285                 }
 286                 game.move(move);
 287                 fens.push(game.fen());
 288                 ++move_override;
 289         }
 290
 291         if (do_update !== false) {
 292                 update();
 293                 window.history.pushState(null, null, get_history_url());
 294         }
 295 }
 296 window['make_move'] = make_move;
 297
 298 var prev_move = function() {
 299         if (move_override > 0) {
 300                 --move_override;
 301                 update();
 302                 window.history.replaceState(null, null, get_history_url());
 303         }
 304 }
 305 window['prev_move'] = prev_move;
 306
 307 var next_move = function() {
 308         if (move_override < game.history().length) {
 309                 ++move_override;
 310                 update();
 311                 window.history.replaceState(null, null, get_history_url());
 312         }
 313 }
 314 window['next_move'] = next_move;
 315
 316 var set_move = function(n, do_update) {
 317         move_override = n;
 318         if (do_update !== false) {
 319                 update();
 320                 window.history.replaceState(null, null, get_history_url());
 321         }
 322 }
 323 window['set_move'] = set_move;
 324
 325 // almost all of this stuff comes from the chessboard.js example page
 326 var onDragStart = function(source, piece, position, orientation) {
 327         var pseudogame = new Chess(current_display_fen());
 328         if (pseudogame.game_over() === true ||
 329             (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
 330             (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
 331                 return false;
 332         }
 333 }
 334
 335 var onDrop = function(source, target) {
 336         // see if the move is legal
 337         var pseudogame = new Chess(current_display_fen());
 338         var move = pseudogame.move({
 339                 from: source,
 340                 to: target,
 341                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 342         });
 343
 344         // illegal move
 345         if (move === null) return 'snapback';
 346 }
 347
 348 var onSnapEnd = function(source, target) {
 349         var pseudogame = new Chess(current_display_fen());
 350         var move = pseudogame.move({
 351                 from: source,
 352                 to: target,
 353                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 354         });
 355
 356         make_move(pseudogame.history({ verbose: true }).pop().san);
 357 }
 358
 359 var onpopstate = function() {
 360         var old_moves = game.history({ verbose: true }).map(function(x) { return x.san; });
 361         var new_moves = document.location.search.replace(/^\?/, "").split(",");
 362
 363         if (new_moves.length == 1 && new_moves[0] == "") {
 364                 new_moves = [];
 365         }
 366
 367         var num_shared_moves;
 368         for (num_shared_moves = 0; num_shared_moves < Math.min(old_moves.length, new_moves.length); ++num_shared_moves) {
 369                 if (old_moves[i] != new_moves[i]) {
 370                         break;
 371                 }
 372         }
 373
 374         set_move(num_shared_moves, false);
 375         for (var i = num_shared_moves; i < new_moves.length; ++i) {
 376                 make_move(new_moves[i], false);
 377         }
 378         update();
 379         window.history.replaceState(null, null, get_history_url());
 380 }
 381
 382 var init = function() {
 383         // Create board.
 384         board = new window.ChessBoard('board', {
 385                 draggable: true,
 386                 position: 'start',
 387                 onDragStart: onDragStart,
 388                 onDrop: onDrop,
 389                 onSnapEnd: onSnapEnd
 390         });
 391
 392         window.onpopstate = onpopstate;
 393         onpopstate();
 394
 395         $(window).keyup(function(event) {
 396                 if (event.which == 39) {
 397                         next_move();
 398                 } else if (event.which == 37) {
 399                         prev_move();
 400                 }
 401         });
 402 }
 403
 404
 405 $(document).ready(init);
 406
 407 })();