Support reverse-dragging, also with engine suggestions.

[remoteglot-book] / www / js / book.js

diff --git a/www/js/book.js b/www/js/book.js
index bc6adfceccca4174daf9ee78d0f274028abc050e..dce293b2a8e70392d083b271b68fac7b5fa63059 100644 (file)
--- a/www/js/book.js
+++ b/www/js/book.js
@@ -8,7 +8,8 @@ var includetransp = true;
 var stockfish = new Worker('/js/stockfish.js');
 var engine_running = false;
 var engine_replacement_callback = null;
-var recommended_dest = null;
+var recommended_move = null;
+var reverse_dragging_from = null;
 
 var entity_map = {
        "&": "&",
@@ -343,25 +344,74 @@ var onDragStart = function(source, piece, position, orientation) {
                return false;
        }
 
-       recommended_dest = null;
-       get_best_dest(pseudogame, source, function(dest) {
+       recommended_move = null;
+       get_best_dest(pseudogame, source, null, function(src, dest) {
                $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
                if (dest !== null) {
                        var squareEl = $('#board .square-' + dest);
                        squareEl.addClass('highlight1-32417');
+                       recommended_move = [src, dest];
                }
-               recommended_dest = dest;
        });
 }
 
-var get_best_dest = function(game, source, cb) {
-       var moves = game.moves({ square: source, verbose: true });
+var mousedownSquare = function(e) {
+       reverse_dragging_from = null;
+       var square = $(this).attr('data-square');
+
+       var pseudogame = new Chess(current_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;
+               get_best_dest(pseudogame, null, square, function(src, dest) {
+                       if (src !== null) {
+                               var squareEl = $('#board .square-' + src);
+                               squareEl.addClass('highlight1-32417');
+                               squareEl = $('#board .square-' + dest);
+                               squareEl.addClass('highlight1-32417');
+                               recommended_move = [src, dest];
+                       }
+               });
+       } else {
+               recommended_src = null;
+       }
+}
+
+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_dest = function(game, source, target, cb) {
+       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) {
-               cb(null);
+               cb(null, null);
                return;
        }
        if (moves.length == 1) {
-               cb(moves[0].to);
+               cb(moves[0].from, moves[0].to);
                return;
        }
 
@@ -370,7 +420,7 @@ var get_best_dest = function(game, source, cb) {
        var when_engine_is_ready = function() {
                engine_running = true;
                stockfish.onmessage = function(event) {
-                       var res = event.data.match(/^bestmove \S\S(\S\S)/);
+                       var res = event.data.match(/^bestmove (\S\S)(\S\S)/);
                        if (res !== null) {
                                engine_running = false;
                                if (engine_replacement_callback !== null) {
@@ -379,7 +429,7 @@ var get_best_dest = function(game, source, cb) {
                                        engine_replacement_callback();
                                        engine_replacement_callback = null;
                                } else {
-                                       cb(res[1]);
+                                       cb(res[1], res[2]);
                                }
                        }
                };
@@ -400,7 +450,7 @@ var onDrop = function(source, target) {
                engine_replacement_callback = function() {};
        }
        if (source == target) {
-               if (recommended_dest === null) {
+               if (recommended_move === null) {
                        return 'snapback';
                } else {
                        // Accept the move. It will be changed in onSnapEnd.
@@ -408,7 +458,7 @@ var onDrop = function(source, target) {
                }
        } else {
                // Suggestion not asked for.
-               recommended_dest = null;
+               recommended_move = null;
        }
 
        // see if the move is legal
@@ -424,10 +474,11 @@ var onDrop = function(source, target) {
 }
 
 var onSnapEnd = function(source, target) {
-       if (source == target && recommended_dest !== null) {
-               target = recommended_dest;
+       if (source == target && recommended_move !== null) {
+               source = recommended_move[0];
+               target = recommended_move[1];
        }
-       recommended_dest = null;
+       recommended_move = null;
        var pseudogame = new Chess(current_display_fen());
        var move = pseudogame.move({
                from: source,
@@ -470,6 +521,8 @@ var init = function() {
                onDrop: onDrop,
                onSnapEnd: onSnapEnd
        });
+       $("#board").on('mousedown', '.square-55d63', mousedownSquare);
+       $("#board").on('mouseup', '.square-55d63', mouseupSquare);
 
        window.onpopstate = onpopstate;
        onpopstate();