/** @type {?jQuery} @private */
var highlighted_move = null;
-/** @type {!number} @private */
-var unique = Math.random();
+/** @type {?number} @private */
+var unique = null;
/** The current position on the board, represented as a FEN string.
* @type {?string}
/** @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
var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
var pv = '';
var i = 0;
- if (opt_limit && opt_showlast) {
+ 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,
}
var update_history = function() {
- if (display_lines[0] === null) {
+ 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));
// The score.
if (data['score'] !== null) {
$("#score").text(data['score']);
+ var short_score = data['score'].replace(/Score: */, "");
+ document.title = '(' + short_score + ') analysis.sesse.net';
+ } else {
+ document.title = 'analysis.sesse.net';
}
// The search stats.
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;
}
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;
}
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);
}
}
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);
}
}
$("#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>");
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.
}
var init = function() {
+ unique = get_unique();
+
// Create board.
board = new window.ChessBoard('board', 'start');
hiddenboard = new window.ChessBoard('hiddenboard', 'start');