Fix a display bug on empty PV.
[remoteglot] / www / js / remoteglot.js
index 47bd62f..f88e1e0 100644 (file)
@@ -34,7 +34,10 @@ var toplay = 'W';
 var ims = 0;
 
 /** @type {boolean} @private */
-var sort_refutation_lines_by_score = false;
+var sort_refutation_lines_by_score = true;
+
+/** @type {boolean} @private */
+var truncate_display_history = true;
 
 /** @type {!string|undefined} @private */
 var highlight_from = undefined;
@@ -42,8 +45,11 @@ var highlight_from = undefined;
 /** @type {!string|undefined} @private */
 var highlight_to = undefined;
 
-/** @type {!number} @private */
-var unique = Math.random();
+/** @type {?jQuery} @private */
+var highlighted_move = null;
+
+/** @type {?number} @private */
+var unique = null;
 
 /** The current position on the board, represented as a FEN string.
  * @type {?string}
@@ -54,7 +60,8 @@ var fen = null;
 /** @typedef {{
  *    start_fen: string,
  *    uci_pv: Array.<string>,
- *    pretty_pv: Array.<string>
+ *    pretty_pv: Array.<string>,
+ *    line_num: number
  * }} DisplayLine
  */
 
@@ -69,6 +76,28 @@ var current_display_line = null;
 /** @type {?number} @private */
 var current_display_move = null;
 
+var supports_html5_storage = function() {
+       try {
+               return 'localStorage' in window && window['localStorage'] !== null;
+       } catch (e) {
+               return false;
+       }
+}
+
+// Make the unique token persistent so people refreshing the page won't count twice.
+// Of course, you can never fully protect against people deliberately wanting to spam.
+var get_unique = function() {
+       var use_local_storage = supports_html5_storage();
+       if (use_local_storage && localStorage['unique']) {
+               return localStorage['unique'];
+       }
+       var unique = Math.random();
+       if (use_local_storage) {
+               localStorage['unique'] = unique;
+       }
+       return unique;
+}
+
 var request_update = function() {
        $.ajax({
                url: "http://analysis.sesse.net/analysis.pl?ims=" + ims + "&unique=" + unique
@@ -377,28 +406,52 @@ var thousands = function(x) {
  * @param {number} move_num
  * @param {!string} toplay
  * @param {number=} opt_limit
+ * @param {boolean=} opt_showlast
  */
-var print_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit) {
+var add_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
        display_lines.push({
                start_fen: fen,
                uci_pv: uci_pv,
-               pretty_pv: pretty_pv 
+               pretty_pv: pretty_pv,
+               line_number: display_lines.length
        });
+       return print_pv(display_lines.length - 1, pretty_pv, move_num, toplay, opt_limit, opt_showlast);
+}
 
+/**
+ * @param {number} line_num
+ * @param {Array.<string>} pretty_pv
+ * @param {number} move_num
+ * @param {!string} toplay
+ * @param {number=} opt_limit
+ * @param {boolean=} opt_showlast
+ */
+var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
        var pv = '';
        var i = 0;
-       if (toplay == 'B') {
-               var move = "<a class=\"move\" href=\"javascript:show_line(" + (display_lines.length - 1) + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
+       if (opt_limit && opt_showlast && pretty_pv.length > opt_limit) {
+               // Truncate the PV at the beginning (instead of at the end).
+               // We assume here that toplay is 'W'. We also assume that if
+               // opt_showlast is set, then it is the history, and thus,
+               // the UI should be to expand the history.
+               pv = '(<a class="move" href="javascript:collapse_history(false)">…</a>) ';
+               i = pretty_pv.length - opt_limit;
+               if (i % 2 == 1) {
+                       ++i;
+               }
+               move_num += i / 2;
+       } else if (toplay == 'B' && pretty_pv.length > 0) {
+               var move = "<a class=\"move\" id=\"automove" + line_num + "-0\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
                pv = move_num + '. … ' + move;
                toplay = 'W';
                ++i;
                ++move_num;
        }
        for ( ; i < pretty_pv.length; ++i) {
-               var move = "<a class=\"move\" href=\"javascript:show_line(" + (display_lines.length - 1) + ", " + i + ");\">" + pretty_pv[i] + "</a>";
+               var move = "<a class=\"move\" id=\"automove" + line_num + "-" + i + "\" href=\"javascript:show_line(" + line_num + ", " + i + ");\">" + pretty_pv[i] + "</a>";
 
                if (toplay == 'W') {
-                       if (i > opt_limit) {
+                       if (i > opt_limit && !opt_showlast) {
                                return pv + ' (…)';
                        }
                        if (pv != '') {
@@ -423,12 +476,33 @@ var update_highlight = function() {
        }
 }
 
+var update_history = function() {
+       if (display_lines[0] === null || display_lines[0].pretty_pv.length == 0) {
+               $("#history").html("No history");
+       } else if (truncate_display_history) {
+               $("#history").html(print_pv(0, display_lines[0].pretty_pv, 1, 'W', 8, true));
+       } else {
+               $("#history").html(
+                       '(<a class="move" href="javascript:collapse_history(true)">collapse</a>) ' +
+                       print_pv(0, display_lines[0].pretty_pv, 1, 'W'));
+       }
+}
+
+/**
+ * @param {!boolean} truncate_history
+ */
+var collapse_history = function(truncate_history) {
+       truncate_display_history = truncate_history;
+       update_history();
+}
+window['collapse_history'] = collapse_history;
+
 var update_refutation_lines = function() {
        if (fen === null) {
                return;
        }
-       if (display_lines.length > 1) {
-               display_lines = [ display_lines[0] ];
+       if (display_lines.length > 2) {
+               display_lines = [ display_lines[0], display_lines[1] ];
        }
 
        var tbl = $("#refutationlines");
@@ -468,7 +542,7 @@ var update_refutation_lines = function() {
                var pv_td = document.createElement("td");
                tr.appendChild(pv_td);
                $(pv_td).addClass("pv");
-               $(pv_td).html(print_pv(fen, line['pv_uci'], line['pv_pretty'], move_num, toplay, 10));
+               $(pv_td).html(add_pv(fen, line['pv_uci'], line['pv_pretty'], move_num, toplay, 10));
 
                tbl.append(tr);
        }
@@ -518,13 +592,25 @@ var update_board = function(data, num_viewers) {
                $("#numviewers").text(num_viewers + " current viewers");
        }
 
+       // The engine id.
+       if (data['id'] && data['id']['name'] !== null) {
+               $("#engineid").text(data['id']['name']);
+       }
+
        // The score.
        if (data['score'] !== null) {
                $("#score").text(data['score']);
        }
+       if (data['short_score'] !== undefined && data['short_score'] !== null) {
+               document.title = '(' + data['short_score'] + ') analysis.sesse.net';
+       } else {
+               document.title = 'analysis.sesse.net';
+       }
 
        // The search stats.
-       if (data['nodes'] && data['nps'] && data['depth']) {
+       if (data['tablebase'] == 1) {
+               $("#searchstats").text("Tablebase result");
+       } else if (data['nodes'] && data['nps'] && data['depth']) {
                var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
                if (data['seldepth']) {
                        stats += ' (' + data['seldepth'] + ' selective)';
@@ -538,6 +624,8 @@ var update_board = function(data, num_viewers) {
                }
 
                $("#searchstats").text(stats);
+       } else {
+               $("#searchstats").text("");
        }
 
        // Update the board itself.
@@ -546,14 +634,22 @@ var update_board = function(data, num_viewers) {
 
        if (data['position']['last_move_uci']) {
                highlight_from = data['position']['last_move_uci'].substr(0, 2);
-               highlight_to = data['position']['last_move_uci'].substr(2, 4);
+               highlight_to = data['position']['last_move_uci'].substr(2, 2);
        } else {
                highlight_from = highlight_to = undefined;
        }
        update_highlight();
 
+       // Print the history.
+       if (data['position']['history']) {
+               add_pv('start', data['position']['history'], data['position']['pretty_history'], 1, 'W', 8, true);
+       } else {
+               display_lines.push(null);
+       }
+       update_history();
+
        // Print the PV.
-       $("#pv").html(print_pv(data['position']['fen'], data['pv_uci'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
+       $("#pv").html(add_pv(data['position']['fen'], data['pv_uci'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
 
        // Update the PV arrow.
        clear_arrows();
@@ -562,7 +658,7 @@ var update_board = function(data, num_viewers) {
                for (var i = 0; i < data['pv_uci'].length; i += 2) {
                        var from = data['pv_uci'][i].substr(0, 2);
                        var to = data['pv_uci'][i].substr(2,4);
-                       if ((i >= 2 && from != data['pv_uci'][i - 2].substr(2, 4)) ||
+                       if ((i >= 2 && from != data['pv_uci'][i - 2].substr(2, 2)) ||
                             interfering_arrow(from, to)) {
                                break;
                        }
@@ -572,7 +668,7 @@ var update_board = function(data, num_viewers) {
                var alt_moves = find_nonstupid_moves(data, 30);
                for (var i = 1; i < alt_moves.length && i < 3; ++i) {
                        create_arrow(alt_moves[i].substr(0, 2),
-                                    alt_moves[i].substr(2, 4), '#f66', 1, 10);
+                                    alt_moves[i].substr(2, 2), '#f66', 1, 10);
                }
        }
 
@@ -603,7 +699,7 @@ var update_board = function(data, num_viewers) {
 
                if (nonstupid_moves.length > 0 && response !== undefined) {
                        create_arrow(response.substr(0, 2),
-                                    response.substr(2, 4), '#66f', 6, 20);
+                                    response.substr(2, 2), '#66f', 6, 20);
                }
        }
 
@@ -627,6 +723,15 @@ var resort_refutation_lines = function(sort_by_score) {
 }
 window['resort_refutation_lines'] = resort_refutation_lines;
 
+/**
+ * @param {boolean} truncate_history
+ */
+var set_truncate_history = function(truncate_history) {
+       truncate_display_history = truncate_history;
+       update_refutation_lines();
+}
+window['set_truncate_history'] = set_truncate_history;
+
 /**
  * @param {number} line_num
  * @param {number} move_num
@@ -646,18 +751,25 @@ var show_line = function(line_num, move_num) {
 window['show_line'] = show_line;
 
 var prev_move = function() {
-       --current_display_move;
+       if (current_display_move > -1) {
+               --current_display_move;
+       }
        update_displayed_line();
 }
 window['prev_move'] = prev_move;
 
 var next_move = function() {
-       ++current_display_move;
+       if (current_display_line && current_display_move < current_display_line.pretty_pv.length - 1) {
+               ++current_display_move;
+       }
        update_displayed_line();
 }
 window['next_move'] = next_move;
 
 var update_displayed_line = function() {
+       if (highlighted_move !== null) {
+               highlighted_move.removeClass('highlight'); 
+       }
        if (current_display_line === null) {
                $("#linenav").hide();
                $("#linemsg").show();
@@ -668,7 +780,7 @@ var update_displayed_line = function() {
        $("#linenav").show();
        $("#linemsg").hide();
 
-       if (current_display_move == 0) {
+       if (current_display_move <= 0) {
                $("#prevmove").html("Previous");
        } else {
                $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>");
@@ -681,9 +793,32 @@ var update_displayed_line = function() {
 
        hiddenboard.position(current_display_line.start_fen, false);
        for (var i = 0; i <= current_display_move; ++i) {
+               var pos = hiddenboard.position();
                var move = current_display_line.uci_pv[i];
-               move = move.substr(0, 2) + "-" + move.substr(2, 4);
+               var source = move.substr(0, 2);
+               var target = move.substr(2, 2);
+               var promo = move.substr(4, 1);
+
+               // Check if we need to do en passant.
+               var piece = pos[source];
+               if (piece == "wP" || piece == "bP") {
+                       if (source.substr(0, 1) != target.substr(0, 1) &&
+                           pos[target] === undefined) {
+                               var ep_square = target.substr(0, 1) + source.substr(1, 1);
+                               delete pos[ep_square];
+                               hiddenboard.position(pos, false);
+                       }
+               }
+
+               move = source + "-" + target;
                hiddenboard.move(move, false);
+               pos = hiddenboard.position();
+
+               // Do promotion if needed.
+               if (promo != "") {
+                       pos[target] = pos[target].substr(0, 1) + promo.toUpperCase();
+                       hiddenboard.position(pos, false);
+               }
 
                // chessboard.js does not automatically move the rook on castling
                // (issue #51; marked as won't fix), so update it ourselves.
@@ -697,10 +832,16 @@ var update_displayed_line = function() {
                        hiddenboard.move("a8-d8", false);
                }
        }
+
+       highlighted_move = $("#automove" + current_display_line.line_number + "-" + current_display_move);
+       highlighted_move.addClass('highlight'); 
+
        board.position(hiddenboard.position());
 }
 
 var init = function() {
+       unique = get_unique();
+
        // Create board.
        board = new window.ChessBoard('board', 'start');
        hiddenboard = new window.ChessBoard('hiddenboard', 'start');