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 fetch_analysis = function() {
  64         var fen = current_display_fen();
  65         $.ajax({
  66                 url: "/opening-stats.pl?fen=" + encodeURIComponent(fen) +
  67                         ";includetransp=" + (includetransp ? 1 : 0)
  68         }).done(function(data, textstatus, xhr) {
  69                 show_lines(data, game);
  70         });
  71 }
  72
  73 var add_td = function(tr, value) {
  74         var td = document.createElement("td");
  75         tr.appendChild(td);
  76         $(td).addClass("num");
  77         $(td).text(value);
  78 }
  79
  80 var TYPE_MOVE = 0;
  81 var TYPE_INTEGER = 1;
  82 var TYPE_FLOAT = 2;
  83 var TYPE_RATIO = 3;
  84
  85 var headings = [
  86         [ "Move", TYPE_MOVE ],
  87         [ "Games", TYPE_INTEGER ],
  88         [ "%", TYPE_RATIO ],
  89         [ "Win%", TYPE_RATIO ],
  90         [ "WWin", TYPE_INTEGER ],
  91         [ "%WW", TYPE_RATIO ],
  92         [ "Bwin", TYPE_INTEGER ],
  93         [ "%BW", TYPE_RATIO ],
  94         [ "Draw", TYPE_INTEGER ],
  95         [ "Draw%", TYPE_RATIO ],
  96         [ "AvWElo", TYPE_FLOAT ],
  97         [ "AvBElo", TYPE_FLOAT ],
  98         [ "EloVar", TYPE_FLOAT ],
  99         [ "AWin%", TYPE_RATIO ],
 100 ];
 101 var sort_by = 1;
 102 var direction = 1;
 103
 104 var show_lines = function(data, game) {
 105         var moves = data['moves'];
 106         $('#numviewers').text(data['opening']);
 107
 108         if (data['root_game']) {
 109                 var text = escape_html(data['root_game']['white']);
 110                 if (data['root_game']['white_elo']) {
 111                         text += " (" + escape_html(data['root_game']['white_elo']) + ")";
 112                 }
 113                 text += " &ndash; " + escape_html(data['root_game']['black']);
 114                 if (data['root_game']['black_elo']) {
 115                         text += " (" + escape_html(data['root_game']['black_elo']) + ")";
 116                 }
 117                 text += " &nbsp;" + escape_html(data['root_game']['result']).replace(/-/, "&ndash;") + "<br />";
 118                 if (data['root_game']['eco']) {
 119                         text += "[" + escape_html(data['root_game']['eco']) + "] ";
 120                 }
 121                 text += "(" + data['root_game']['moves'] + ") ";
 122                 text += escape_html(data['root_game']['event']) + " &nbsp;" + escape_html(data['root_game']['date']);
 123                 $('#gamesummary').html(text);
 124         }
 125
 126         var total_num = 0;
 127         for (var i = 0; i < moves.length; ++i) {
 128                 var move = moves[i];
 129                 if (move['move']) {
 130                         total_num += parseInt(move['white']);
 131                         total_num += parseInt(move['draw']);
 132                         total_num += parseInt(move['black']);
 133                 }
 134         }
 135
 136         var headings_tr = $("#headings");
 137         headings_tr.empty();
 138         for (var i = 0; i < headings.length; ++i) {
 139                 var th = document.createElement("th");
 140                 headings_tr.append(th);
 141                 $(th).text(headings[i][0]);
 142                 (function(new_sort_by) {
 143                         $(th).click(function() {
 144                                 if (sort_by == new_sort_by) {
 145                                         direction = -direction;
 146                                 } else {
 147                                         sort_by = new_sort_by;
 148                                         direction = 1;
 149                                 }
 150                                 show_lines(data, game);
 151                         });
 152                 })(i);
 153         }
 154
 155         var lines = [];
 156         var transpose_only = [];
 157         for (var i = 0; i < moves.length; ++i) {
 158                 var move = moves[i];
 159                 var line = [];
 160
 161                 var white = parseInt(move['white']);
 162                 var draw = parseInt(move['draw']);
 163                 var black = parseInt(move['black']);
 164
 165                 line.push(move['move']);  // Move.
 166                 transpose_only.push(move['transpose_only']);
 167                 var num = white + draw + black;
 168                 line.push(num);  // N.
 169                 line.push(num / total_num);  // %.
 170
 171                 // Win%.
 172                 var white_win_ratio = (white + 0.5 * draw) / num;
 173                 var win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 174                 line.push(win_ratio);
 175
 176                 line.push(white);        // WWin.
 177                 line.push(white / num);  // %WW.
 178                 line.push(black);        // BWin.
 179                 line.push(black / num);  // %BW.
 180                 line.push(draw);         // Draw.
 181                 line.push(draw / num);   // %Draw.
 182
 183                 if (move['num_elo'] >= 10) {
 184                         // Elo.
 185                         line.push(move['white_avg_elo']);
 186                         line.push(move['black_avg_elo']);
 187                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 188
 189                         // Win% corrected for Elo.
 190                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 191                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 192                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 193                         win_ratio = (move_override % 2 == 0) ? white_win_ratio : 1.0 - white_win_ratio;
 194                         line.push(win_ratio);
 195                 } else {
 196                         line.push(null);
 197                         line.push(null);
 198                         line.push(null);
 199                         line.push(null);
 200                 }
 201                 lines.push(line);
 202         }
 203
 204         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 205
 206         var tbl = $("#lines");
 207         tbl.empty();
 208
 209         for (var i = 0; i < moves.length; ++i) {
 210                 var line = lines[i];
 211                 var tr = document.createElement("tr");
 212
 213                 if (line[0] === undefined) {
 214                         $(tr).addClass("totals");
 215                 } else if (transpose_only[i]) {
 216                         $(tr).addClass("transponly");
 217                 }
 218
 219                 for (var j = 0; j < line.length; ++j) {
 220                         if (line[j] === null) {
 221                                 add_td(tr, "");
 222                         } else if (headings[j][1] == TYPE_MOVE) {
 223                                 var td = document.createElement("td");
 224                                 tr.appendChild(td);
 225                                 $(td).addClass("move");
 226                                 if (line[j] !== undefined) {
 227                                         if (move_override % 2 == 0) {
 228                                                 $(td).text(((move_override / 2) + 1) + ". ");
 229                                         } else {
 230                                                 $(td).text(((move_override / 2) + 0.5) + "…");
 231                                         }
 232                                 }
 233
 234                                 var move_a = document.createElement("a");
 235                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 236                                 td.appendChild(move_a);
 237                                 $(move_a).text(line[j]);
 238                         } else if (headings[j][1] == TYPE_INTEGER) {
 239                                 add_td(tr, line[j] || 0);
 240                         } else if (headings[j][1] == TYPE_FLOAT) {
 241                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 242                                         add_td(tr, '');
 243                                 } else {
 244                                         add_td(tr, line[j].toFixed(1));
 245                                 }
 246                         } else {
 247                                 if (isNaN(line[j]) || !isFinite(line[j])) {
 248                                         add_td(tr, '');
 249                                 } else {
 250                                         add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 251                                 }
 252                         }
 253                 }
 254
 255                 tbl.append(tr);
 256         }
 257 }
 258
 259 var set_includetransp = function(value) {
 260         includetransp = value;
 261         update();
 262 }
 263 window['set_includetransp'] = set_includetransp;
 264
 265 var make_move = function(move) {
 266         var history = game.history({ verbose: true });
 267         if (move_override < history.length && history[move_override].san == move) {
 268                 // User effectively only moved forward in history.
 269                 ++move_override;
 270         } else {
 271                 var moves = game.history();
 272                 // Truncate the history if needed.
 273                 if (move_override < moves.length) {
 274                         game = new Chess();
 275                         for (var i = 0; i < move_override; ++i) {
 276                                 game.move(moves[i]);
 277                         }
 278                         fens.length = move_override;
 279                 }
 280                 game.move(move);
 281                 fens.push(game.fen());
 282                 ++move_override;
 283         }
 284         update();
 285 }
 286 window['make_move'] = make_move;
 287
 288 var prev_move = function() {
 289         if (move_override > 0) {
 290                 --move_override;
 291                 update();
 292         }
 293 }
 294 window['prev_move'] = prev_move;
 295
 296 var next_move = function() {
 297         if (move_override < game.history().length) {
 298                 ++move_override;
 299                 update();
 300         }
 301 }
 302 window['next_move'] = next_move;
 303
 304 var set_move = function(n) {
 305         move_override = n;
 306         update();
 307 }
 308 window['set_move'] = set_move;
 309
 310 // almost all of this stuff comes from the chessboard.js example page
 311 var onDragStart = function(source, piece, position, orientation) {
 312         var pseudogame = new Chess(current_display_fen());
 313         if (pseudogame.game_over() === true ||
 314             (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
 315             (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
 316                 return false;
 317         }
 318 }
 319
 320 var onDrop = function(source, target) {
 321         // see if the move is legal
 322         var pseudogame = new Chess(current_display_fen());
 323         var move = pseudogame.move({
 324                 from: source,
 325                 to: target,
 326                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 327         });
 328
 329         // illegal move
 330         if (move === null) return 'snapback';
 331 }
 332
 333 var onSnapEnd = function(source, target) {
 334         var pseudogame = new Chess(current_display_fen());
 335         var move = pseudogame.move({
 336                 from: source,
 337                 to: target,
 338                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 339         });
 340
 341         make_move(pseudogame.history({ verbose: true }).pop().san);
 342 }
 343
 344 var init = function() {
 345         // Create board.
 346         board = new window.ChessBoard('board', {
 347                 draggable: true,
 348                 position: 'start',
 349                 onDragStart: onDragStart,
 350                 onDrop: onDrop,
 351                 onSnapEnd: onSnapEnd
 352         });
 353         update();
 354
 355         $(window).keyup(function(event) {
 356                 if (event.which == 39) {
 357                         next_move();
 358                 } else if (event.which == 37) {
 359                         prev_move();
 360                 }
 361         });
 362 }
 363
 364
 365 $(document).ready(init);
 366
 367 })();