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

   1 (function() {
   2
   3 var board = null;
   4 var history = [];
   5 var move_override = 0;
   6
   7 var entity_map = {
   8         "&": "&amp;",
   9         "<": "&lt;",
  10         ">": "&gt;",
  11         '"': '&quot;',
  12         "'": '&#39;',
  13 };
  14
  15 function escape_html(string) {
  16         return String(string).replace(/[&<>"']/g, function (s) {
  17                 return entity_map[s];
  18         });
  19 }
  20
  21 var get_game = function() {
  22         var game = new Chess();
  23         for (var i = 0; i < move_override; ++i) {
  24                 game.move(history[i]);
  25         }
  26         return game;
  27 }
  28
  29 var update = function() {
  30         var game = get_game();
  31         board.position(game.fen());
  32         fetch_analysis();
  33 }
  34
  35 var fetch_analysis = function() {
  36         var game = get_game();
  37         $.ajax({
  38                 url: "/opening-stats.pl?fen=" + encodeURIComponent(game.fen())
  39         }).done(function(data, textstatus, xhr) {
  40                 show_lines(data, game);
  41         });
  42 }
  43
  44 var add_td = function(tr, value) {
  45         var td = document.createElement("td");
  46         tr.appendChild(td);
  47         $(td).addClass("num");
  48         $(td).text(value);
  49 }
  50
  51 var TYPE_MOVE = 0;
  52 var TYPE_INTEGER = 1;
  53 var TYPE_FLOAT = 2;
  54 var TYPE_RATIO = 3;
  55
  56 var headings = [
  57         [ "Move", TYPE_MOVE ],
  58         [ "Games", TYPE_INTEGER ],
  59         [ "%", TYPE_RATIO ],
  60         [ "Win%", TYPE_RATIO ],
  61         [ "WWin", TYPE_INTEGER ],
  62         [ "%WW", TYPE_RATIO ],
  63         [ "Bwin", TYPE_INTEGER ],
  64         [ "%BW", TYPE_RATIO ],
  65         [ "Draw", TYPE_INTEGER ],
  66         [ "Draw%", TYPE_RATIO ],
  67         [ "AvWElo", TYPE_FLOAT ],
  68         [ "AvBElo", TYPE_FLOAT ],
  69         [ "EloVar", TYPE_FLOAT ],
  70         [ "AWin%", TYPE_RATIO ],
  71 ];
  72 var sort_by = 1;
  73 var direction = 1;
  74
  75 var show_lines = function(data, game) {
  76         var moves = data['moves'];
  77         $('#numviewers').text(data['opening']);
  78
  79         if (data['root_game']) {
  80                 var text = escape_html(data['root_game']['white']);
  81                 if (data['root_game']['white_elo']) {
  82                         text += " (" + escape_html(data['root_game']['white_elo']) + ")";
  83                 }
  84                 text += " &ndash; " + escape_html(data['root_game']['black']);
  85                 if (data['root_game']['black_elo']) {
  86                         text += " (" + escape_html(data['root_game']['black_elo']) + ")";
  87                 }
  88                 text += " &nbsp;" + escape_html(data['root_game']['result']).replace(/-/, "&ndash;") + "<br />";
  89                 if (data['root_game']['eco']) {
  90                         text += "[" + escape_html(data['root_game']['eco']) + "] ";
  91                 }
  92                 text += "(" + data['root_game']['moves'] + ") ";
  93                 text += escape_html(data['root_game']['event']) + " &nbsp;" + escape_html(data['root_game']['date']);
  94                 $('#gamesummary').html(text);
  95         }
  96
  97         var total_num = 0;
  98         for (var i = 0; i < moves.length; ++i) {
  99                 var move = moves[i];
 100                 if (move['move']) {
 101                         total_num += parseInt(move['white']);
 102                         total_num += parseInt(move['draw']);
 103                         total_num += parseInt(move['black']);
 104                 }
 105         }
 106
 107         var headings_tr = $("#headings");
 108         headings_tr.empty();
 109         for (var i = 0; i < headings.length; ++i) {
 110                 var th = document.createElement("th");
 111                 headings_tr.append(th);
 112                 $(th).text(headings[i][0]);
 113                 (function(new_sort_by) {
 114                         $(th).click(function() {
 115                                 if (sort_by == new_sort_by) {
 116                                         direction = -direction;
 117                                 } else {
 118                                         sort_by = new_sort_by;
 119                                         direction = 1;
 120                                 }
 121                                 show_lines(data, game);
 122                         });
 123                 })(i);
 124         }
 125
 126         var lines = [];
 127         for (var i = 0; i < moves.length; ++i) {
 128                 var move = moves[i];
 129                 var line = [];
 130
 131                 var white = parseInt(move['white']);
 132                 var draw = parseInt(move['draw']);
 133                 var black = parseInt(move['black']);
 134
 135                 line.push(move['move']);  // Move.
 136                 var num = white + draw + black;
 137                 line.push(num);  // N.
 138                 line.push(num / total_num);  // %.
 139
 140                 // Win%.
 141                 var white_win_ratio = (white + 0.5 * draw) / num;
 142                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 143                 line.push(win_ratio);
 144
 145                 line.push(white);        // WWin.
 146                 line.push(white / num);  // %WW.
 147                 line.push(black);        // BWin.
 148                 line.push(black / num);  // %BW.
 149                 line.push(draw);         // Draw.
 150                 line.push(draw / num);   // %Draw.
 151
 152                 if (move['num_elo'] >= 10) {
 153                         // Elo.
 154                         line.push(move['white_avg_elo']);
 155                         line.push(move['black_avg_elo']);
 156                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 157
 158                         // Win% corrected for Elo.
 159                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 160                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 161                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 162                         win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 163                         line.push(win_ratio);
 164                 } else {
 165                         line.push(null);
 166                         line.push(null);
 167                         line.push(null);
 168                         line.push(null);
 169                 }
 170                 lines.push(line);
 171         }
 172
 173         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 174
 175         var tbl = $("#lines");
 176         tbl.empty();
 177
 178         for (var i = 0; i < moves.length; ++i) {
 179                 var line = lines[i];
 180                 var tr = document.createElement("tr");
 181
 182                 if (line[0] === undefined) {
 183                         $(tr).addClass("totals");
 184                 }
 185
 186                 for (var j = 0; j < line.length; ++j) {
 187                         if (line[j] === null) {
 188                                 add_td(tr, "");
 189                         } else if (headings[j][1] == TYPE_MOVE) {
 190                                 var td = document.createElement("td");
 191                                 tr.appendChild(td);
 192                                 $(td).addClass("move");
 193                                 if (line[j] !== undefined) {
 194                                         if (move_override % 2 == 0) {
 195                                                 $(td).text(((move_override / 2) + 1) + ". ");
 196                                         } else {
 197                                                 $(td).text(((move_override / 2) + 0.5) + ". …");
 198                                         }
 199                                 }
 200
 201                                 var move_a = document.createElement("a");
 202                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 203                                 td.appendChild(move_a);
 204                                 $(move_a).text(line[j]);
 205                         } else if (headings[j][1] == TYPE_INTEGER) {
 206                                 add_td(tr, line[j]);
 207                         } else if (headings[j][1] == TYPE_FLOAT) {
 208                                 add_td(tr, line[j].toFixed(1));
 209                         } else {
 210                                 add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 211                         }
 212                 }
 213
 214                 tbl.append(tr);
 215         }
 216 }
 217
 218 var make_move = function(move) {
 219         history.length = move_override;
 220         history.push(move);
 221         move_override = history.length;
 222         update();
 223 }
 224 window['make_move'] = make_move;
 225
 226 var prev_move = function() {
 227         if (move_override > 0) {
 228                 --move_override;
 229                 update();
 230         }
 231 }
 232 window['prev_move'] = prev_move;
 233
 234 var next_move = function() {
 235         if (move_override < history.length) {
 236                 ++move_override;
 237                 update();
 238         }
 239 }
 240 window['next_move'] = next_move;
 241
 242 // almost all of this stuff comes from the chessboard.js example page
 243 var onDragStart = function(source, piece, position, orientation) {
 244         var game = get_game();
 245         if (game.game_over() === true ||
 246             (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
 247             (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
 248                 return false;
 249         }
 250 }
 251
 252 var onDrop = function(source, target) {
 253         // see if the move is legal
 254         var game = get_game();
 255         var move = game.move({
 256                 from: source,
 257                 to: target,
 258                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 259         });
 260
 261         // illegal move
 262         if (move === null) return 'snapback';
 263
 264         history = game.history({ verbose: true });
 265         move_override = history.length;
 266 };
 267
 268 // update the board position after the piece snap
 269 // for castling, en passant, pawn promotion
 270 var onSnapEnd = function() {
 271         var game = get_game();
 272         board.position(game.fen());
 273         fetch_analysis();
 274 };
 275
 276 var init = function() {
 277         // Create board.
 278         board = new window.ChessBoard('board', {
 279                 draggable: true,
 280                 position: 'start',
 281                 onDragStart: onDragStart,
 282                 onDrop: onDrop,
 283                 onSnapEnd: onSnapEnd
 284         });
 285         update();
 286
 287         $(window).keyup(function(event) {
 288                 if (event.which == 39) {
 289                         next_move();
 290                 } else if (event.which == 37) {
 291                         prev_move();
 292                 }
 293         });
 294 }
 295
 296
 297 $(document).ready(init);
 298
 299 })();