X-Git-Url: https://git.sesse.net/?p=remoteglot;a=blobdiff_plain;f=www%2Fjs%2Fremoteglot.js;h=ff566ab85c81c4ba4b33ff8a9853bec23d8f89ca;hp=33ae193cbe42ccc51696060d666e6c5da8b8dd9a;hb=01a8eaa3db2c015b25c0cf53df96b12493f3db58;hpb=b41084f89311bcd25493642953eb675432e2bb63 diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js index 33ae193..ff566ab 100644 --- a/www/js/remoteglot.js +++ b/www/js/remoteglot.js @@ -7,7 +7,7 @@ * @type {Number} * @const * @private */ -var SCRIPT_VERSION = 2015062104; +var SCRIPT_VERSION = 2016113002; /** * The current backend URL. @@ -16,10 +16,14 @@ var SCRIPT_VERSION = 2015062104; * @private */ var backend_url = "/analysis.pl"; +var backend_hash_url = "/hash"; /** @type {window.ChessBoard} @private */ var board = null; +/** @type {boolean} @private */ +var board_is_animating = false; + /** * The most recent analysis data we have from the server * (about the most recent position). @@ -29,7 +33,7 @@ var board = null; var current_analysis_data = null; /** - * If we are displaying previous analysis, this is non-null, + * If we are displaying previous analysis or from hash, this is non-null, * and will override most of current_analysis_data. * * @type {?Object} @@ -43,7 +47,10 @@ var displayed_analysis_data = null; * @type {?Array.<{ * name: string, * url: string, + * hashurl: string, * id: string, + * score: Object=, + * result: string=, * }>} * @private */ @@ -65,8 +72,19 @@ var arrows = []; /** @type {Array.>} */ var occupied_by_arrows = []; +/** Currently displayed refutation lines (on-screen). + * Can either come from the current_analysis_data, displayed_analysis_data, + * or hash_refutation_lines. + */ var refutation_lines = []; +/** Refutation lines from current hash probe. + * + * If non-null, will override refutation lines from the base position. + * Note that these are relative to display_fen, not base_fen. + */ +var hash_refutation_lines = null; + /** @type {!number} @private */ var move_num = 1; @@ -76,9 +94,6 @@ var toplay = 'W'; /** @type {number} @private */ var ims = 0; -/** @type {boolean} @private */ -var sort_refutation_lines_by_score = true; - /** @type {boolean} @private */ var truncate_display_history = true; @@ -93,6 +108,19 @@ var highlight_to = undefined; * @private */ var highlighted_move = null; +/** Currently suggested/recommended move when dragging. + * @type {?{from: !string, to: !string}} + * @private + */ +var recommended_move = null; + +/** If reverse-dragging (dragging from the destination square to the + * source square), the destination square. + * @type {?string} + * @private + */ +var reverse_dragging_from = null; + /** @type {?number} @private */ var unique = null; @@ -111,24 +139,37 @@ var client_clock_offset_ms = null; var clock_timer = null; +/** The current position being analyzed, represented as a FEN string. + * Note that this is not necessarily the same as display_fen. + * @type {?string} + * @private + */ +var base_fen = null; + /** The current position on the board, represented as a FEN string. + * Note that board.fen() does not contain e.g. who is to play. * @type {?string} * @private */ -var fen = null; +var display_fen = null; /** @typedef {{ * start_fen: string, - * uci_pv: Array., - * pretty_pv: Array., - * line_num: number + * pv: Array., + * move_num: number, + * toplay: string, + * scores: Array<{first_move: number, score: Object}>, + * start_display_move_num: number * }} DisplayLine + * + * "start_display_move_num" is the (half-)move number to start displaying the PV at. + * "score" is also evaluated at this point. */ /** All PVs that we currently know of. * * Element 0 is history (or null if no history). - * Element 1 is current main PV. + * Element 1 is current main PV, or explored line if nowhere else on the screen. * All remaining elements are refutation lines (multi-PV). * * @type {Array.} @@ -171,6 +212,23 @@ var current_analysis_request_timer = null; */ var current_historic_xhr = null; +/** + * The current backend request to get hash probes, if any, so that we can abort it. + * + * @type {?jqXHR} + * @private + */ +var current_hash_xhr = null; + +/** + * The current timer to display hash probe information (it could be waiting on the + * board to stop animating), if any, so that we can abort it. + * + * @type {?Number} + * @private + */ +var current_hash_display_timer = null; + var supports_html5_storage = function() { try { return 'localStorage' in window && window['localStorage'] !== null; @@ -216,13 +274,31 @@ var request_update = function() { location.reload(true); } - possibly_play_sound(current_analysis_data, new_data); - current_analysis_data = new_data; - update_board(current_analysis_data, displayed_analysis_data); - update_num_viewers(num_viewers); + // Verify that the PV makes sense. + var valid = true; + if (new_data['pv']) { + var hiddenboard = new Chess(new_data['position']['fen']); + for (var i = 0; i < new_data['pv'].length; ++i) { + if (hiddenboard.move(new_data['pv'][i]) === null) { + valid = false; + break; + } + } + } + + var timeout = 100; + if (valid) { + possibly_play_sound(current_analysis_data, new_data); + current_analysis_data = new_data; + update_board(); + update_num_viewers(num_viewers); + } else { + console.log("Received invalid update, waiting five seconds and trying again."); + location.reload(true); + } // Next update. - current_analysis_request_timer = setTimeout(function() { request_update(); }, 100); + current_analysis_request_timer = setTimeout(function() { request_update(); }, timeout); }).fail(function(jqXHR, textStatus, errorThrown) { if (textStatus === "abort") { // Aborted because we are switching backends. Abandon and don't retry, @@ -457,7 +533,7 @@ var position_arrow = function(arrow) { head.setAttribute("fill", arrow.fg_color); svg.appendChild(head); - $(svg).css({ top: pos.top, left: pos.left }); + $(svg).css({ top: pos.top, left: pos.left, 'pointer-events': 'none' }); document.body.appendChild(svg); arrow.svg = svg; } @@ -490,17 +566,9 @@ var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_ arrows.push(arrow); } -var compare_by_sort_key = function(refutation_lines, a, b) { - var ska = refutation_lines[a]['sort_key']; - var skb = refutation_lines[b]['sort_key']; - if (ska < skb) return -1; - if (ska > skb) return 1; - return 0; -}; - -var compare_by_score = function(refutation_lines, a, b) { - var sa = parseInt(refutation_lines[b]['score_sort_key'], 10); - var sb = parseInt(refutation_lines[a]['score_sort_key'], 10); +var compare_by_score = function(refutation_lines, invert, a, b) { + var sa = compute_score_sort_key(refutation_lines[b]['score'], refutation_lines[b]['depth'], invert); + var sb = compute_score_sort_key(refutation_lines[a]['score'], refutation_lines[a]['depth'], invert); return sa - sb; } @@ -511,24 +579,26 @@ var compare_by_score = function(refutation_lines, a, b) { * @param {!Object} data * @param {number} margin The maximum number of centipawns worse than the * best move can be and still be included. - * @return {Array.} The UCI representation (e.g. e1g1) of all + * @param {boolean} invert Whether black is to play. + * @return {Array.} The FEN representation (e.g. Ne4) of all * moves, in score order. */ -var find_nonstupid_moves = function(data, margin) { +var find_nonstupid_moves = function(data, margin, invert) { // First of all, if there are any moves that are more than 0.5 ahead of // the primary move, the refutation lines are probably bunk, so just // kill them all. var best_score = undefined; var pv_score = undefined; for (var move in data['refutation_lines']) { - var score = parseInt(data['refutation_lines'][move]['score_sort_key'], 10); - if (move == data['pv_uci'][0]) { + var line = data['refutation_lines'][move]; + var score = compute_score_sort_key(line['score'], line['depth'], invert, false); + if (move == data['pv'][0]) { pv_score = score; } if (best_score === undefined || score > best_score) { best_score = score; } - if (!(data['refutation_lines'][move]['depth'] >= 8)) { + if (line['depth'] < 8) { return []; } } @@ -541,13 +611,14 @@ var find_nonstupid_moves = function(data, margin) { // The PV move will always be first. var moves = []; for (var move in data['refutation_lines']) { - var score = parseInt(data['refutation_lines'][move]['score_sort_key'], 10); - if (move != data['pv_uci'][0] && best_score - score <= margin) { + var line = data['refutation_lines'][move]; + var score = compute_score_sort_key(line['score'], line['depth'], invert); + if (move != data['pv'][0] && best_score - score <= margin) { moves.push(move); } } - moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], a, b) }); - moves.unshift(data['pv_uci'][0]); + moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], data['position']['toplay'] === 'B', a, b) }); + moves.unshift(data['pv'][0]); return moves; } @@ -561,70 +632,94 @@ var thousands = function(x) { } /** - * @param {!string} fen - * @param {Array.} pretty_pv + * @param {!string} start_fen + * @param {Array.} pv * @param {number} move_num * @param {!string} toplay + * @param {Array<{ first_move: integer, score: Object }>} scores + * @param {number} start_display_move_num * @param {number=} opt_limit * @param {boolean=} opt_showlast */ -var add_pv = function(fen, pretty_pv, move_num, toplay, opt_limit, opt_showlast) { +var add_pv = function(start_fen, pv, move_num, toplay, scores, start_display_move_num, opt_limit, opt_showlast) { display_lines.push({ - start_fen: fen, - pretty_pv: pretty_pv, - line_number: display_lines.length + start_fen: start_fen, + pv: pv, + move_num: parseInt(move_num), + toplay: toplay, + scores: scores, + start_display_move_num: start_display_move_num }); - return print_pv(display_lines.length - 1, pretty_pv, move_num, toplay, opt_limit, opt_showlast); + return print_pv(display_lines.length - 1, opt_limit, opt_showlast); } /** * @param {number} line_num - * @param {Array.} pretty_pv - * @param {number} move_num - * @param {!string} toplay - * @param {number=} opt_limit - * @param {boolean=} opt_showlast + * @param {number=} opt_limit If set, show at most this number of moves. + * @param {boolean=} opt_showlast If limit is set, show the last moves instead of the first ones. */ -var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_showlast) { - var pv = ''; +var print_pv = function(line_num, opt_limit, opt_showlast) { + var display_line = display_lines[line_num]; + var pv = display_line.pv; + var move_num = display_line.move_num; + var toplay = display_line.toplay; + + // Truncate PV at the start if needed. + var start_display_move_num = display_line.start_display_move_num; + if (start_display_move_num > 0) { + pv = pv.slice(start_display_move_num); + var to_add = start_display_move_num; + if (toplay === 'B') { + ++move_num; + toplay = 'W'; + --to_add; + } + if (to_add % 2 == 1) { + toplay = 'B'; + --to_add; + } + move_num += to_add / 2; + } + + var ret = ''; var i = 0; - if (opt_limit && opt_showlast && pretty_pv.length > opt_limit) { + if (opt_limit && opt_showlast && 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 = '(…) '; - i = pretty_pv.length - opt_limit; + ret = '(…) '; + i = pv.length - opt_limit; if (i % 2 == 1) { ++i; } move_num += i / 2; - } else if (toplay == 'B' && pretty_pv.length > 0) { - var move = "" + pretty_pv[0] + ""; - pv = move_num + '. … ' + move; + } else if (toplay == 'B' && pv.length > 0) { + var move = "" + pv[0] + ""; + ret = move_num + '. … ' + move; toplay = 'W'; ++i; ++move_num; } - for ( ; i < pretty_pv.length; ++i) { - var move = "" + pretty_pv[i] + ""; + for ( ; i < pv.length; ++i) { + var move = "" + pv[i] + ""; if (toplay == 'W') { if (i > opt_limit && !opt_showlast) { - return pv + ' (…)'; + return ret + ' (…)'; } - if (pv != '') { - pv += ' '; + if (ret != '') { + ret += ' '; } - pv += move_num + '. ' + move; + ret += move_num + '. ' + move; ++move_num; toplay = 'B'; } else { - pv += ' ' + move; + ret += ' ' + move; toplay = 'W'; } } - return pv; + return ret; } /** Update the highlighted to/from squares on the board. @@ -640,14 +735,14 @@ var update_board_highlight = function() { } var update_history = function() { - if (display_lines[0] === null || display_lines[0].pretty_pv.length == 0) { + if (display_lines[0] === null || display_lines[0].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)); + $("#history").html(print_pv(0, 8, true)); } else { $("#history").html( '(collapse) ' + - print_pv(0, display_lines[0].pretty_pv, 1, 'W')); + print_pv(0)); } } @@ -665,23 +760,36 @@ window['collapse_history'] = collapse_history; * Also recreates the global "display_lines". */ var update_refutation_lines = function() { - if (fen === null) { + if (base_fen === null) { return; } if (display_lines.length > 2) { // Truncate so that only the history and PV is left. display_lines = [ display_lines[0], display_lines[1] ]; } - var tbl = $("#refutationlines"); tbl.empty(); + // Find out where the lines start from. + var base_line = []; + var base_scores = display_lines[1].scores; + var start_display_move_num = 0; + if (hash_refutation_lines) { + base_line = current_display_line.pv.slice(0, current_display_move + 1); + base_scores = current_display_line.scores; + start_display_move_num = base_line.length; + } + var moves = []; for (var move in refutation_lines) { moves.push(move); } - var compare = sort_refutation_lines_by_score ? compare_by_score : compare_by_sort_key; - moves = moves.sort(function(a, b) { return compare(refutation_lines, a, b) }); + + var invert = (toplay === 'B'); + if (current_display_line && current_display_move % 2 == 0) { + invert = !invert; + } + moves = moves.sort(function(a, b) { return compare_by_score(refutation_lines, invert, a, b) }); for (var i = 0; i < moves.length; ++i) { var line = refutation_lines[moves[i]]; @@ -690,39 +798,60 @@ var update_refutation_lines = function() { var move_td = document.createElement("td"); tr.appendChild(move_td); $(move_td).addClass("move"); - if (line['pv_pretty'].length == 0) { - $(move_td).text(line['pretty_move']); - } else { - var move = "" + line['pretty_move'] + ""; + + var scores = base_scores.concat([{ first_move: start_display_move_num, score: line['score'] }]); + + if (line['pv'].length == 0) { + // Not found, so just make a one-move PV. + var move = "" + line['move'] + ""; $(move_td).html(move); + var score_td = document.createElement("td"); + + $(score_td).addClass("score"); + $(score_td).text("—"); + tr.appendChild(score_td); + + var depth_td = document.createElement("td"); + tr.appendChild(depth_td); + $(depth_td).addClass("depth"); + $(depth_td).text("—"); + + var pv_td = document.createElement("td"); + tr.appendChild(pv_td); + $(pv_td).addClass("pv"); + $(pv_td).html(add_pv(base_fen, base_line.concat([ line['move'] ]), move_num, toplay, scores, start_display_move_num)); + + tbl.append(tr); + continue; } + var move = "" + line['move'] + ""; + $(move_td).html(move); + var score_td = document.createElement("td"); tr.appendChild(score_td); $(score_td).addClass("score"); - $(score_td).text(line['pretty_score']); + $(score_td).text(format_short_score(line['score'])); var depth_td = document.createElement("td"); tr.appendChild(depth_td); $(depth_td).addClass("depth"); - $(depth_td).text("d" + line['depth']); + if (line['depth'] && line['depth'] >= 0) { + $(depth_td).text("d" + line['depth']); + } else { + $(depth_td).text("—"); + } var pv_td = document.createElement("td"); tr.appendChild(pv_td); $(pv_td).addClass("pv"); - $(pv_td).html(add_pv(fen, line['pv_pretty'], move_num, toplay, 10)); + $(pv_td).html(add_pv(base_fen, base_line.concat(line['pv']), move_num, toplay, scores, start_display_move_num, 10)); tbl.append(tr); } - // Make one of the links clickable and the other nonclickable. - if (sort_refutation_lines_by_score) { - $("#sortbyscore0").html("Move"); - $("#sortbyscore1").html("Score"); - } else { - $("#sortbyscore0").html("Move"); - $("#sortbyscore1").html("Score"); - } + // Update the move highlight, as we've rewritten all the HTML. + update_move_highlight(); } /** @@ -735,7 +864,7 @@ var update_refutation_lines = function() { */ var chess_from = function(fen, moves, last_move) { var hiddenboard = new Chess(); - if (fen !== null) { + if (fen !== null && fen !== undefined) { hiddenboard.load(fen); } for (var i = 0; i <= last_move; ++i) { @@ -764,13 +893,34 @@ var update_game_list = function(games) { var game_name = document.createTextNode(game['name']); if (game['url'] === backend_url) { + // This game. game_span.appendChild(game_name); + + if (current_analysis_data && current_analysis_data['position']) { + var score; + if (current_analysis_data['position']['result']) { + score = " (" + current_analysis_data['position']['result'] + ")"; + } else { + score = " (" + format_short_score(current_analysis_data['score']) + ")"; + } + game_span.appendChild(document.createTextNode(score)); + } } else { + // Some other game. var game_a = document.createElement("a"); game_a.setAttribute("href", "#" + game['id']); game_a.appendChild(game_name); game_span.appendChild(game_a); + + var score; + if (game['result']) { + score = " (" + game['result'] + ")"; + } else { + score = " (" + format_short_score(game['score']) + ")"; + } + game_span.appendChild(document.createTextNode(score)); } + games_div.appendChild(game_span); } } @@ -788,27 +938,27 @@ var possibly_switch_game_from_hash = function() { for (var i = 0; i < current_games.length; ++i) { if (current_games[i]['id'] === hash) { if (backend_url !== current_games[i]['url']) { - switch_backend(current_games[i]['url']); + switch_backend(current_games[i]); } return; } } } -/** - * @param {Object} data - * @param {?Object} display_data +/** Update all the HTML on the page, based on current global state. */ -var update_board = function(current_data, display_data) { - var data = display_data || current_data; +var update_board = function() { + var data = displayed_analysis_data || current_analysis_data; + var current_data = current_analysis_data; // Convenience alias. display_lines = []; // Print the history. This is pretty much the only thing that's // unconditionally taken from current_data (we're not interested in // historic history). - if (current_data['position']['pretty_history']) { - add_pv('start', current_data['position']['pretty_history'], 1, 'W', 8, true); + if (current_data['position']['history']) { + var start = (current_data['position'] && current_data['position']['start_fen']) ? current_data['position']['start_fen'] : 'start'; + add_pv(start, current_data['position']['history'], 1, 'W', null, 0, 8, true); } else { display_lines.push(null); } @@ -818,11 +968,10 @@ var update_board = function(current_data, display_data) { if (current_data['games']) { current_games = current_data['games']; possibly_switch_game_from_hash(); - update_game_list(current_data['games']); } else { current_games = null; - update_game_list(null); } + update_game_list(current_games); // The headline. Names are always fetched from current_data; // the rest can depend a bit. @@ -880,18 +1029,30 @@ var update_board = function(current_data, display_data) { } var last_move; - if (display_data) { + if (displayed_analysis_data) { // Displaying some non-current position, pick out the last move // from the history. This will work even if the fetch failed. - last_move = format_halfmove_with_number( - current_display_line.pretty_pv[current_display_move], - current_display_move + 1); - headline += ' after ' + last_move; + if (current_display_move !== -1) { + last_move = format_halfmove_with_number( + current_display_line.pv[current_display_move], + current_display_move); + headline += ' after ' + last_move; + } } else if (data['position']['last_move'] !== 'none') { + // Find the previous move. + var previous_move_num, previous_toplay; + if (data['position']['toplay'] == 'B') { + previous_move_num = data['position']['move_num']; + previous_toplay = 'W'; + } else { + previous_move_num = data['position']['move_num'] - 1; + previous_toplay = 'B'; + } + last_move = format_move_with_number( data['position']['last_move'], - data['position']['move_num'], - data['position']['toplay'] == 'W'); + previous_move_num, + previous_toplay == 'W'); headline += ' after ' + last_move; } else { last_move = null; @@ -900,8 +1061,10 @@ var update_board = function(current_data, display_data) { // The contains a very brief headline. var title_elems = []; - if (data['short_score'] !== undefined && data['short_score'] !== null) { - title_elems.push(data['short_score'].replace(/^ /, "")); + if (data['position'] && data['position']['result']) { + title_elems.push(data['position']['result']); + } else if (data['score']) { + title_elems.push(format_short_score(data['score'])); } if (last_move !== null) { title_elems.push(last_move); @@ -917,13 +1080,14 @@ var update_board = function(current_data, display_data) { if (data['position'] && data['position']['last_move_uci']) { highlight_from = data['position']['last_move_uci'].substr(0, 2); highlight_to = data['position']['last_move_uci'].substr(2, 2); - } else if (current_display_line_is_history && current_display_move >= 0) { + } else if (current_display_line_is_history && current_display_line && current_display_move >= 0) { // We don't have historic analysis for this position, but we // can reconstruct what the last move was by just replaying // from the start. - var hiddenboard = chess_from(null, current_display_line.pretty_pv, current_display_move); + var position = (data['position'] && data['position']['start_fen']) ? data['position']['start_fen'] : null; + var hiddenboard = chess_from(position, current_display_line.pv, current_display_move); var moves = hiddenboard.history({ verbose: true }); - var last_move = moves.pop(); + last_move = moves.pop(); highlight_from = last_move.from; highlight_to = last_move.to; } else { @@ -933,6 +1097,7 @@ var update_board = function(current_data, display_data) { if (data['failed']) { $("#score").text("No analysis for this move"); + $("#pvtitle").text("PV:"); $("#pv").empty(); $("#searchstats").html(" "); $("#refutationlines").empty(); @@ -949,12 +1114,29 @@ var update_board = function(current_data, display_data) { update_clock(); // The score. - if (data['score'] !== null) { - $("#score").text(data['score']); + if (current_display_line && !current_display_line_is_history) { + var score; + if (current_display_line.scores && current_display_line.scores.length > 0) { + for (var i = 0; i < current_display_line.scores.length; ++i) { + if (current_display_move < current_display_line.scores[i].first_move) { + break; + } + score = current_display_line.scores[i].score; + } + } + if (score) { + $("#score").text(format_long_score(score)); + } else { + $("#score").text("No score for this line"); + } + } else if (data['score']) { + $("#score").text(format_long_score(data['score'])); } // The search stats. - if (data['tablebase'] == 1) { + if (data['searchstats']) { + $("#searchstats").html(data['searchstats']); + } else 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'; @@ -975,53 +1157,70 @@ var update_board = function(current_data, display_data) { } // Update the board itself. - fen = data['position']['fen']; + base_fen = data['position']['fen']; update_displayed_line(); - update_move_highlight(); // Print the PV. - $("#pv").html(add_pv(data['position']['fen'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay'])); + $("#pvtitle").text("PV:"); + + var scores = [{ first_move: -1, score: data['score'] }]; + $("#pv").html(add_pv(data['position']['fen'], data['pv'], data['position']['move_num'], data['position']['toplay'], scores, 0)); // Update the PV arrow. clear_arrows(); - if (data['pv_uci'].length >= 1) { + if (data['pv'].length >= 1) { + var hiddenboard = new Chess(base_fen); + // draw a continuation arrow as long as it's the same piece - 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, 2)) || - interfering_arrow(from, to)) { + var last_to; + for (var i = 0; i < data['pv'].length; i += 2) { + var move = hiddenboard.move(data['pv'][i]); + if ((i >= 2 && move.from != last_to) || + interfering_arrow(move.from, move.to)) { break; } - create_arrow(from, to, '#f66', 6, 20); + create_arrow(move.from, move.to, '#f66', 6, 20); + last_to = move.from; + hiddenboard.move(data['pv'][i + 1]); // To keep continuity. } - var alt_moves = find_nonstupid_moves(data, 30); + var alt_moves = find_nonstupid_moves(data, 30, data['position']['toplay'] === 'B'); for (var i = 1; i < alt_moves.length && i < 3; ++i) { - create_arrow(alt_moves[i].substr(0, 2), - alt_moves[i].substr(2, 2), '#f66', 1, 10); + hiddenboard = new Chess(base_fen); + var move = hiddenboard.move(alt_moves[i]); + if (move !== null) { + create_arrow(move.from, move.to, '#f66', 1, 10); + } } } // See if all semi-reasonable moves have only one possible response. - if (data['pv_uci'].length >= 2) { - var nonstupid_moves = find_nonstupid_moves(data, 300); - var response = data['pv_uci'][1]; + if (data['pv'].length >= 2) { + var nonstupid_moves = find_nonstupid_moves(data, 300, data['position']['toplay'] === 'B'); + var response; + { + var hiddenboard = new Chess(base_fen); + hiddenboard.move(data['pv'][0]); + response = hiddenboard.move(data['pv'][1]); + } for (var i = 0; i < nonstupid_moves.length; ++i) { - if (nonstupid_moves[i] == data['pv_uci'][0]) { + if (nonstupid_moves[i] == data['pv'][0]) { // ignore the PV move for refutation lines. continue; } if (!data['refutation_lines'] || !data['refutation_lines'][nonstupid_moves[i]] || - !data['refutation_lines'][nonstupid_moves[i]]['pv_uci'] || - data['refutation_lines'][nonstupid_moves[i]]['pv_uci'].length < 1) { + !data['refutation_lines'][nonstupid_moves[i]]['pv'] || + data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 1) { // Incomplete PV, abort. response = undefined; break; } - var this_response = data['refutation_lines'][nonstupid_moves[i]]['pv_uci'][1]; - if (response !== this_response) { + var line = data['refutation_lines'][nonstupid_moves[i]]; + hiddenboard = new Chess(base_fen); + hiddenboard.move(line['pv'][0]); + var this_response = hiddenboard.move(line['pv'][1]); + if (response.from !== this_response.from || response.to !== this_response.to) { // Different response depending on lines, abort. response = undefined; break; @@ -1029,16 +1228,15 @@ var update_board = function(current_data, display_data) { } if (nonstupid_moves.length > 0 && response !== undefined) { - create_arrow(response.substr(0, 2), - response.substr(2, 2), '#66f', 6, 20); + create_arrow(response.from, response.to, '#66f', 6, 20); } } // Update the refutation lines. - fen = data['position']['fen']; - move_num = data['position']['move_num']; + base_fen = data['position']['fen']; + move_num = parseInt(data['position']['move_num']); toplay = data['position']['toplay']; - refutation_lines = data['refutation_lines']; + refutation_lines = hash_refutation_lines || data['refutation_lines']; update_refutation_lines(); // Update the sparkline last, since its size depends on how everything else reflowed. @@ -1076,15 +1274,15 @@ var update_sparkline = function(data) { var scores = []; for (var halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) { if (data['score_history'][halfmove_num]) { - var score = data['score_history'][halfmove_num][0]; + var score = compute_plot_score(data['score_history'][halfmove_num]); + last_score = score; if (score < min_score) min_score = score; if (score > max_score) max_score = score; - last_score = data['score_history'][halfmove_num][0]; } scores.push(last_score); } - if (data['plot_score']) { - scores.push(data['plot_score']); + if (data['score']) { + scores.push(compute_plot_score(data['score'])); } // FIXME: at some widths, calling sparkline() seems to push // #scorecontainer under the board. @@ -1094,7 +1292,16 @@ var update_sparkline = function(data) { chartRangeMin: min_score, chartRangeMax: max_score, tooltipFormatter: function(sparkline, options, fields) { - return format_tooltip(data, fields[0].offset + first_move_num); + // score_history contains the Nth _position_, but format_tooltip + // wants to format the Nth _move_; thus the -1. + return format_tooltip(data, fields[0].offset + first_move_num - 1); + } + }); + $('#scorespark').bind('sparklineClick', function(event) { + var sparkline = event.sparklines[0]; + var region = sparkline.getCurrentRegionFields(); + if (region[0].offset !== undefined) { + show_line(0, first_move_num + region[0].offset - 1); } }); } else { @@ -1122,6 +1329,8 @@ var update_clock = function() { clearTimeout(clock_timer); var data = displayed_analysis_data || current_analysis_data; + if (!data) return; + if (data['position']) { var result = data['position']['result']; if (result === '1-0') { @@ -1149,7 +1358,6 @@ var update_clock = function() { var white_clock_ms = null; var black_clock_ms = null; - var show_seconds = false; // Static clocks. if (data['position'] && @@ -1190,8 +1398,9 @@ var update_clock = function() { return; } - // If either player has ten minutes or less left, add the second counters. - var show_seconds = (white_clock_ms < 60 * 10 * 1000 || black_clock_ms < 60 * 10 * 1000); + // If either player has twenty minutes or less left, add the second counters. + // This matches what DGT clocks do. + var show_seconds = (white_clock_ms < 60 * 20 * 1000 || black_clock_ms < 60 * 20 * 1000); if (color) { // See when the clock will change next, and update right after that. @@ -1247,15 +1456,15 @@ var format_2d = function(x) { /** * @param {string} move - * @param {Number} move_num - * @param {boolean} white_to_play + * @param {Number} move_num Move number of this move. + * @param {boolean} white_to_play Whether white is to play this move. */ var format_move_with_number = function(move, move_num, white_to_play) { var ret; if (white_to_play) { - ret = (move_num - 1) + '… '; - } else { ret = move_num + '. '; + } else { + ret = move_num + '… '; } ret += move; return ret; @@ -1263,7 +1472,8 @@ var format_move_with_number = function(move, move_num, white_to_play) { /** * @param {string} move - * @param {Number} halfmove_num + * @param {Number} halfmove_num Half-move number that is to be played, + * starting from 0. */ var format_halfmove_with_number = function(move, halfmove_num) { return format_move_with_number( @@ -1277,42 +1487,39 @@ var format_halfmove_with_number = function(move, halfmove_num) { * @param {Number} halfmove_num */ var format_tooltip = function(data, halfmove_num) { - if (data['score_history'][halfmove_num] || - halfmove_num === data['position']['pretty_history'].length) { + if (data['score_history'][halfmove_num + 1] || + (halfmove_num + 1) === data['position']['history'].length) { + // Position is in the history, or it is the current position + // (which is implicitly tacked onto the history). var move; var short_score; - if (halfmove_num === data['position']['pretty_history'].length) { + if ((halfmove_num + 1) === data['position']['history'].length) { move = data['position']['last_move']; - short_score = data['short_score']; + short_score = format_short_score(data['score']); } else { - move = data['position']['pretty_history'][halfmove_num]; - short_score = data['score_history'][halfmove_num][1]; + move = data['position']['history'][halfmove_num]; + short_score = format_short_score(data['score_history'][halfmove_num + 1]); + } + if (halfmove_num === -1) { + return "Start position: " + short_score; + } else { + var move_with_number = format_halfmove_with_number(move, halfmove_num); + return "After " + move_with_number + ": " + short_score; } - var move_with_number = format_halfmove_with_number(move, halfmove_num); - - return "After " + move_with_number + ": " + short_score; } else { - for (var i = halfmove_num; i --> 0; ) { + for (var i = halfmove_num; i --> -1; ) { if (data['score_history'][i]) { - var move = data['position']['pretty_history'][i]; - return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]"; + var move = data['position']['history'][i]; + if (i === -1) { + return "[Analysis kept from start position]"; + } else { + return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]"; + } } } } } -/** - * @param {boolean} sort_by_score - */ -var resort_refutation_lines = function(sort_by_score) { - sort_refutation_lines_by_score = sort_by_score; - if (supports_html5_storage()) { - localStorage['sort_refutation_lines_by_score'] = sort_by_score ? 1 : 0; - } - update_refutation_lines(); -} -window['resort_refutation_lines'] = resort_refutation_lines; - /** * @param {boolean} truncate_history */ @@ -1330,27 +1537,31 @@ var show_line = function(line_num, move_num) { if (line_num == -1) { current_display_line = null; current_display_move = null; + hash_refutation_lines = null; if (displayed_analysis_data) { // TODO: Support exiting to history position if we are in an // analysis line of a history position. displayed_analysis_data = null; - update_board(current_analysis_data, displayed_analysis_data); } + update_board(); + return; } else { - current_display_line = display_lines[line_num]; - current_display_move = move_num; + current_display_line = jQuery.extend({}, display_lines[line_num]); // Shallow clone. + current_display_move = move_num + current_display_line.start_display_move_num; } current_display_line_is_history = (line_num == 0); update_historic_analysis(); update_displayed_line(); update_board_highlight(); + update_move_highlight(); redraw_arrows(); } window['show_line'] = show_line; var prev_move = function() { - if (current_display_move > -1) { + if (current_display_line && + current_display_move >= current_display_line.start_display_move_num) { --current_display_move; } update_historic_analysis(); @@ -1360,7 +1571,8 @@ var prev_move = function() { window['prev_move'] = prev_move; var next_move = function() { - if (current_display_line && current_display_move < current_display_line.pretty_pv.length - 1) { + if (current_display_line && + current_display_move < current_display_line.pv.length - 1) { ++current_display_move; } update_historic_analysis(); @@ -1369,17 +1581,35 @@ var next_move = function() { } window['next_move'] = next_move; +var next_game = function() { + if (current_games === null) { + return; + } + + // Try to find the game we are currently looking at. + for (var game_num = 0; game_num < current_games.length; ++game_num) { + var game = current_games[game_num]; + if (game['url'] === backend_url) { + var next_game_num = (game_num + 1) % current_games.length; + switch_backend(current_games[next_game_num]); + return; + } + } + + // Couldn't find it; give up. +} + var update_historic_analysis = function() { if (!current_display_line_is_history) { return; } - if (current_display_move == current_display_line.pretty_pv.length - 1) { + if (current_display_move == current_display_line.pv.length - 1) { displayed_analysis_data = null; - update_board(current_analysis_data, displayed_analysis_data); + update_board(); } // Fetch old analysis for this line if it exists. - var hiddenboard = chess_from(null, current_display_line.pretty_pv, current_display_move); + var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move); var filename = "/history/move" + (current_display_move + 1) + "-" + hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json"; @@ -1387,14 +1617,14 @@ var update_historic_analysis = function() { url: filename }).done(function(data, textstatus, xhr) { displayed_analysis_data = data; - update_board(current_analysis_data, displayed_analysis_data); + update_board(); }).fail(function(jqXHR, textStatus, errorThrown) { if (textStatus === "abort") { // Aborted because we are switching backends. Don't do anything; // we will already have been cleared. } else { displayed_analysis_data = {'failed': true}; - update_board(current_analysis_data, displayed_analysis_data); + update_board(); } }); } @@ -1435,23 +1665,71 @@ var update_imbalance = function(fen) { } /** Mark the currently selected move in red. + * Also replaces the PV with the current displayed line if it's not shown + * anywhere else on the screen. */ var update_move_highlight = function() { if (highlighted_move !== null) { highlighted_move.removeClass('highlight'); } - if (current_display_line !== null) { - highlighted_move = $("#automove" + current_display_line.line_number + "-" + current_display_move); - highlighted_move.addClass('highlight'); + if (current_display_line) { + var display_line_num = find_display_line_matching_num(); + if (display_line_num === null) { + // Replace the PV with the (complete) line. + $("#pvtitle").text("Exploring:"); + current_display_line.start_display_move_num = 0; + display_lines.push(current_display_line); + $("#pv").html(print_pv(display_lines.length - 1)); + display_line_num = display_lines.length - 1; + + // Clear out the PV, so it's not selected by anything later. + display_lines[1].pv = []; + } + + highlighted_move = $("#automove" + display_line_num + "-" + (current_display_move - current_display_line.start_display_move_num)); + highlighted_move.addClass('highlight'); } } +/** + * See if the current displayed line is identical to any of the ones + * we have on screen. (It might not be if e.g. the analysis reloaded + * since we started looking.) + * + * @return {?number} + */ +var find_display_line_matching_num = function() { + for (var i = 0; i < display_lines.length; ++i) { + var line = display_lines[i]; + if (line.start_display_move_num > 0) continue; + if (current_display_line.start_fen !== line.start_fen) continue; + if (current_display_line.pv.length !== line.pv.length) continue; + var ok = true; + for (var j = 0; j < line.pv.length; ++j) { + if (current_display_line.pv[j] !== line.pv[j]) { + ok = false; + break; + } + } + if (ok) { + return i; + } + } + return null; +} + +/** Update the board based on the currently displayed line. + * + * TODO: This should really be called only whenever something changes, + * instead of all the time. + */ var update_displayed_line = function() { if (current_display_line === null) { $("#linenav").hide(); $("#linemsg").show(); - board.position(fen); - update_imbalance(fen); + display_fen = base_fen; + set_board_position(base_fen); + update_imbalance(base_fen); return; } @@ -1463,17 +1741,32 @@ var update_displayed_line = function() { } else { $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>"); } - if (current_display_move == current_display_line.pretty_pv.length - 1) { + if (current_display_move == current_display_line.pv.length - 1) { $("#nextmove").html("Next"); } else { $("#nextmove").html("<a href=\"javascript:next_move();\">Next</a></span>"); } - var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pretty_pv, current_display_move); - board.position(hiddenboard.fen()); + var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move); + set_board_position(hiddenboard.fen()); + if (display_fen !== hiddenboard.fen() && !current_display_line_is_history) { + // Fire off a hash request, since we're now off the main position + // and it just changed. + explore_hash(hiddenboard.fen()); + } + display_fen = hiddenboard.fen(); update_imbalance(hiddenboard.fen()); } +var set_board_position = function(new_fen) { + board_is_animating = true; + var old_fen = board.fen(); + board.position(new_fen); + if (board.fen() === old_fen) { + board_is_animating = false; + } +} + /** * @param {boolean} param_enable_sound */ @@ -1500,10 +1793,336 @@ var set_sound = function(param_enable_sound) { } window['set_sound'] = set_sound; +/** Send off a hash probe request to the backend. + * @param {string} fen + */ +var explore_hash = function(fen) { + // If we already have a backend response going, abort it. + if (current_hash_xhr) { + current_hash_xhr.abort(); + } + if (current_hash_display_timer) { + clearTimeout(current_hash_display_timer); + current_hash_display_timer = null; + } + $("#refutationlines").empty(); + current_hash_xhr = $.ajax({ + url: backend_hash_url + "?fen=" + fen + }).done(function(data, textstatus, xhr) { + show_explore_hash_results(data, fen); + }); +} + +/** Process the JSON response from a hash probe request. + * @param {!Object} data + * @param {string} fen + */ +var show_explore_hash_results = function(data, fen) { + if (board_is_animating) { + // Updating while the animation is still going causes + // the animation to jerk. This is pretty crude, but it will do. + current_hash_display_timer = setTimeout(function() { show_explore_hash_results(data, fen); }, 100); + return; + } + current_hash_display_timer = null; + hash_refutation_lines = data['lines']; + update_board(); +} + +// almost all of this stuff comes from the chessboard.js example page +var onDragStart = function(source, piece, position, orientation) { + var pseudogame = new Chess(display_fen); + if (pseudogame.game_over() === true || + (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) || + (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) { + return false; + } + + recommended_move = get_best_move(pseudogame, source, null, pseudogame.turn() === 'b'); + if (recommended_move) { + var squareEl = $('#board .square-' + recommended_move.to); + squareEl.addClass('highlight1-32417'); + } + return true; +} + +var mousedownSquare = function(e) { + reverse_dragging_from = null; + var square = $(this).attr('data-square'); + + var pseudogame = new Chess(display_fen); + if (pseudogame.game_over() === true) { + return; + } + + // If the square is empty, or has a piece of the side not to move, + // we handle it. If not, normal piece dragging will take it. + var position = board.position(); + if (!position.hasOwnProperty(square) || + (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) || + (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) { + reverse_dragging_from = square; + recommended_move = get_best_move(pseudogame, null, square, pseudogame.turn() === 'b'); + if (recommended_move) { + var squareEl = $('#board .square-' + recommended_move.from); + squareEl.addClass('highlight1-32417'); + squareEl = $('#board .square-' + recommended_move.to); + squareEl.addClass('highlight1-32417'); + } + } +} + +var mouseupSquare = function(e) { + if (reverse_dragging_from === null) { + return; + } + var source = $(this).attr('data-square'); + var target = reverse_dragging_from; + reverse_dragging_from = null; + if (onDrop(source, target) !== 'snapback') { + onSnapEnd(source, target); + } + $("#board").find('.square-55d63').removeClass('highlight1-32417'); +} + +var get_best_move = function(game, source, target, invert) { + var moves = game.moves({ verbose: true }); + if (source !== null) { + moves = moves.filter(function(move) { return move.from == source; }); + } + if (target !== null) { + moves = moves.filter(function(move) { return move.to == target; }); + } + if (moves.length == 0) { + return null; + } + if (moves.length == 1) { + return moves[0]; + } + + // More than one move. Use the display lines (if we have them) + // to disambiguate; otherwise, we have no information. + var move_hash = {}; + for (var i = 0; i < moves.length; ++i) { + move_hash[moves[i].san] = moves[i]; + } + + // See if we're already exploring some line. + if (current_display_line && + current_display_move < current_display_line.pv.length - 1) { + var first_move = current_display_line.pv[current_display_move + 1]; + if (move_hash[first_move]) { + return move_hash[first_move]; + } + } + + // History and PV take priority over the display lines. + for (var i = 0; i < 2; ++i) { + var line = display_lines[i]; + var first_move = line.pv[line.start_display_move_num]; + if (move_hash[first_move]) { + return move_hash[first_move]; + } + } + + var best_move = null; + var best_move_score = null; + + for (var move in refutation_lines) { + var line = refutation_lines[move]; + if (!line['score']) { + continue; + } + var first_move = line['pv'][0]; + if (move_hash[first_move]) { + var score = compute_score_sort_key(line['score'], line['depth'], invert); + if (best_move_score === null || score > best_move_score) { + best_move = move_hash[first_move]; + best_move_score = score; + } + } + } + return best_move; +} + +var onDrop = function(source, target) { + if (source === target) { + if (recommended_move === null) { + return 'snapback'; + } else { + // Accept the move. It will be changed in onSnapEnd. + return; + } + } else { + // Suggestion not asked for. + recommended_move = null; + } + + // see if the move is legal + var pseudogame = new Chess(display_fen); + var move = pseudogame.move({ + from: source, + to: target, + promotion: 'q' // NOTE: always promote to a queen for example simplicity + }); + + // illegal move + if (move === null) return 'snapback'; +} + +var onSnapEnd = function(source, target) { + if (source === target && recommended_move !== null) { + source = recommended_move.from; + target = recommended_move.to; + } + recommended_move = null; + var pseudogame = new Chess(display_fen); + var move = pseudogame.move({ + from: source, + to: target, + promotion: 'q' // NOTE: always promote to a queen for example simplicity + }); + + if (current_display_line && + current_display_move < current_display_line.pv.length - 1 && + current_display_line.pv[current_display_move + 1] === move.san) { + next_move(); + return; + } + + // Walk down the displayed lines until we find one that starts with + // this move, then select that. Note that this gives us a good priority + // order (history first, then PV, then multi-PV lines). + for (var i = 0; i < display_lines.length; ++i) { + if (i == 1 && current_display_line) { + // Do not choose PV if not on it. + continue; + } + var line = display_lines[i]; + if (line.pv[line.start_display_move_num] === move.san) { + show_line(i, 0); + return; + } + } + + // Shouldn't really be here if we have hash probes, but there's really + // nothing we can do. +} +// End of dragging-related code. + +var fmt_cp = function(v) { + if (v === 0) { + return "0.00"; + } else if (v > 0) { + return "+" + (v / 100).toFixed(2); + } else { + v = -v; + return "-" + (v / 100).toFixed(2); + } +} + +var format_short_score = function(score) { + if (!score) { + return "???"; + } + if (score[0] === 'm') { + if (score[2]) { // Is a bound. + return score[2] + "\u00a0M " + score[1]; + } else { + return "M " + score[1]; + } + } else if (score[0] === 'd') { + return "TB draw"; + } else if (score[0] === 'cp') { + if (score[2]) { // Is a bound. + return score[2] + "\u00a0" + fmt_cp(score[1]); + } else { + return fmt_cp(score[1]); + } + } + return null; +} + +var format_long_score = function(score) { + if (!score) { + return "???"; + } + if (score[0] === 'm') { + if (score[1] > 0) { + return "White mates in " + score[1]; + } else { + return "Black mates in " + (-score[1]); + } + } else if (score[0] === 'd') { + return "Theoretical draw"; + } else if (score[0] === 'cp') { + return "Score: " + format_short_score(score); + } + return null; +} + +var compute_plot_score = function(score) { + if (score[0] === 'm') { + if (score[1] > 0) { + return 500; + } else { + return -500; + } + } else if (score[0] === 'd') { + return 0; + } else if (score[0] === 'cp') { + if (score[1] > 500) { + return 500; + } else if (score[1] < -500) { + return -500; + } else { + return score[1]; + } + } + return null; +} + /** - * @param {string} new_backend_url + * @param score The score digest tuple. + * @param {?number} depth Depth the move has been computed to, or null. + * @param {boolean} invert Whether black is to play. + * @param {boolean=} depth_secondary_key + * @return {number} */ -var switch_backend = function(new_backend_url) { +var compute_score_sort_key = function(score, depth, invert, depth_secondary_key) { + var s; + if (!score) { + return -10000000; + } + if (score[0] === 'm') { + if (score[1] > 0) { + // White mates. + s = 99999 - score[1]; + } else { + // Black mates (note the double negative for score[1]). + s = -99999 - score[1]; + } + } else if (score[0] === 'd') { + s = 0; + } else if (score[0] === 'cp') { + s = score[1]; + } + if (s) { + if (invert) s = -s; + if (depth_secondary_key) { + return s * 200 + (depth || 0); + } else { + return s; + } + } else { + return null; + } +} + +/** + * @param {Object} game + */ +var switch_backend = function(game) { // Stop looking at historic data. current_display_line = null; current_display_move = null; @@ -1516,6 +2135,9 @@ var switch_backend = function(new_backend_url) { if (current_analysis_xhr) { current_analysis_xhr.abort(); } + if (current_hash_xhr) { + current_hash_xhr.abort(); + } // Otherwise, we should have a timer going to start a new one. // Kill that, too. @@ -1523,9 +2145,15 @@ var switch_backend = function(new_backend_url) { clearTimeout(current_analysis_request_timer); current_analysis_request_timer = null; } + if (current_hash_display_timer) { + clearTimeout(current_hash_display_timer); + current_hash_display_timer = null; + } // Request an immediate fetch with the new backend. - backend_url = new_backend_url; + backend_url = game['url']; + backend_hash_url = game['hashurl']; + window.location.hash = '#' + game['id']; current_analysis_data = null; ims = 0; request_update(); @@ -1541,14 +2169,18 @@ var init = function() { } else { set_sound(false); } - if (supports_html5_storage() && localStorage['sort_refutation_lines_by_score']) { - sort_refutation_lines_by_score = parseInt(localStorage['sort_refutation_lines_by_score']); - } else { - sort_refutation_lines_by_score = true; - } // Create board. - board = new window.ChessBoard('board', 'start'); + board = new window.ChessBoard('board', { + onMoveEnd: function() { board_is_animating = false; }, + + draggable: true, + onDragStart: onDragStart, + onDrop: onDrop, + onSnapEnd: onSnapEnd + }); + $("#board").on('mousedown', '.square-55d63', mousedownSquare); + $("#board").on('mouseup', '.square-55d63', mouseupSquare); request_update(); $(window).resize(function() { @@ -1558,10 +2190,17 @@ var init = function() { redraw_arrows(); }); $(window).keyup(function(event) { - if (event.which == 39) { + if (event.which == 39) { // Left arrow. next_move(); - } else if (event.which == 37) { + } else if (event.which == 37) { // Right arrow. prev_move(); + } else if (event.which >= 49 && event.which <= 57) { // 1-9. + var num = event.which - 49; + if (current_games && current_games.length >= num) { + switch_backend(current_games[num]); + } + } else if (event.which == 78) { // N. + next_game(); } }); window.addEventListener('hashchange', possibly_switch_game_from_hash, false);