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

   1 (function() {
   2
   3 var board = null;
   4 var moves = [];
   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(moves[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                 total_num += parseInt(move['white']);
 101                 total_num += parseInt(move['draw']);
 102                 total_num += parseInt(move['black']);
 103         }
 104
 105         var headings_tr = $("#headings");
 106         headings_tr.empty();
 107         for (var i = 0; i < headings.length; ++i) {
 108                 var th = document.createElement("th");
 109                 headings_tr.append(th);
 110                 $(th).text(headings[i][0]);
 111                 (function(new_sort_by) {
 112                         $(th).click(function() {
 113                                 if (sort_by == new_sort_by) {
 114                                         direction = -direction;
 115                                 } else {
 116                                         sort_by = new_sort_by;
 117                                         direction = 1;
 118                                 }
 119                                 show_lines(data, game);
 120                         });
 121                 })(i);
 122         }
 123
 124         var lines = [];
 125         for (var i = 0; i < moves.length; ++i) {
 126                 var move = moves[i];
 127                 var line = [];
 128
 129                 var white = parseInt(move['white']);
 130                 var draw = parseInt(move['draw']);
 131                 var black = parseInt(move['black']);
 132
 133                 line.push(move['move']);  // Move.
 134                 var num = white + draw + black;
 135                 line.push(num);  // N.
 136                 line.push(num / total_num);  // %.
 137
 138                 // Win%.
 139                 var white_win_ratio = (white + 0.5 * draw) / num;
 140                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 141                 line.push(win_ratio);
 142
 143                 line.push(white);        // WWin.
 144                 line.push(white / num);  // %WW.
 145                 line.push(black);        // BWin.
 146                 line.push(black / num);  // %BW.
 147                 line.push(draw);         // Draw.
 148                 line.push(draw / num);   // %Draw.
 149
 150                 if (move['num_elo'] >= 10) {
 151                         // Elo.
 152                         line.push(move['white_avg_elo']);
 153                         line.push(move['black_avg_elo']);
 154                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 155
 156                         // Win% corrected for Elo.
 157                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 158                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 159                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 160                         win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 161                         line.push(win_ratio);
 162                 } else {
 163                         line.push(null);
 164                         line.push(null);
 165                         line.push(null);
 166                         line.push(null);
 167                 }
 168                 lines.push(line);
 169         }
 170
 171         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 172
 173         var tbl = $("#lines");
 174         tbl.empty();
 175
 176         for (var i = 0; i < moves.length; ++i) {
 177                 var line = lines[i];
 178                 var tr = document.createElement("tr");
 179
 180                 for (var j = 0; j < line.length; ++j) {
 181                         if (line[j] === null) {
 182                                 add_td(tr, "");
 183                         } else if (headings[j][1] == TYPE_MOVE) {
 184                                 var td = document.createElement("td");
 185                                 tr.appendChild(td);
 186                                 $(td).addClass("move");
 187                                 var move_a = document.createElement("a");
 188                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 189                                 td.appendChild(move_a);
 190                                 $(move_a).text(line[j]);
 191                         } else if (headings[j][1] == TYPE_INTEGER) {
 192                                 add_td(tr, line[j]);
 193                         } else if (headings[j][1] == TYPE_FLOAT) {
 194                                 add_td(tr, line[j].toFixed(1));
 195                         } else {
 196                                 add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 197                         }
 198                 }
 199
 200                 tbl.append(tr);
 201         }
 202 }
 203
 204 var make_move = function(move) {
 205         moves.length = move_override;
 206         moves.push(move);
 207         move_override = moves.length;
 208         update();
 209 }
 210 window['make_move'] = make_move;
 211
 212 var prev_move = function() {
 213         if (move_override > 0) {
 214                 --move_override;
 215                 update();
 216         }
 217 }
 218 window['prev_move'] = prev_move;
 219
 220 var next_move = function() {
 221         if (move_override < moves.length) {
 222                 ++move_override;
 223                 update();
 224         }
 225 }
 226 window['next_move'] = next_move;
 227
 228 // almost all of this stuff comes from the chessboard.js example page
 229 var onDragStart = function(source, piece, position, orientation) {
 230         var game = get_game();
 231         if (game.game_over() === true ||
 232             (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
 233             (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
 234                 return false;
 235         }
 236 }
 237
 238 var onDrop = function(source, target) {
 239         // see if the move is legal
 240         var game = get_game();
 241         var move = game.move({
 242                 from: source,
 243                 to: target,
 244                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 245         });
 246
 247         // illegal move
 248         if (move === null) return 'snapback';
 249
 250         moves = game.history({ verbose: true });
 251         move_override = moves.length;
 252 };
 253
 254 // update the board position after the piece snap
 255 // for castling, en passant, pawn promotion
 256 var onSnapEnd = function() {
 257         var game = get_game();
 258         board.position(game.fen());
 259         fetch_analysis();
 260 };
 261
 262 var init = function() {
 263         // Create board.
 264         board = new window.ChessBoard('board', {
 265                 draggable: true,
 266                 position: 'start',
 267                 onDragStart: onDragStart,
 268                 onDrop: onDrop,
 269                 onSnapEnd: onSnapEnd
 270         });
 271         update();
 272
 273         $(window).keyup(function(event) {
 274                 if (event.which == 39) {
 275                         next_move();
 276                 } else if (event.which == 37) {
 277                         prev_move();
 278                 }
 279         });
 280 }
 281
 282
 283 $(document).ready(init);
 284
 285 })();