מדיה ויקי:Gadget-pgnviewer.js

הערה: לאחר הפרסום, ייתכן שיהיה צורך לנקות את זיכרון המטמון (cache) של הדפדפן כדי להבחין בשינויים.

• פיירפוקס / ספארי: להחזיק את המקש Shift בעת לחיצה על טעינה מחדש (Reload), או ללחוץ על צירוף המקשים Ctrl-F5 או Ctrl-R (במחשב מק: ⌘-R).
• גוגל כרום: ללחוץ על צירוף המקשים Ctrl-Shift-R (במחשב מק: ⌘-Shift-R).
• אינטרנט אקספלורר / אדג': להחזיק את המקש Ctrl בעת לחיצה על רענן (Refresh), או ללחוץ על צירוף המקשים Ctrl-F5.
• אופרה: ללחוץ על Ctrl-F5.

/*
this work is placed by its authors in the public domain.
it was created from scratch, and no part of it was copied from elsewhere.
it can be used, copied, modified, redistributed, as-is or modified,
	whole or in part, without restrictions.
it can be embedded in a copyright protected work, as long as it's clear
	that the copyright does not apply to the embedded parts themselves.
please do not claim for yourself copyrights for this work or parts of it.
the work comes with no warranty or guarantee, stated or implied, including
	fitness for a particular purpose.
*/
"use strict";
window.mw.hook( 'wikipage.content' ).add( function ( $content ) {
	var // const, really, but linter...
		WHITE = 'l',
		BLACK = 'd',
		acode = 'a'.charCodeAt(0),
		minBlockSize = 20,
		maxBlockSize = 60,
		boardPadding = 20,
		wrapperSelector = 'div.pgn-source-wrapper',
		defaultBlockSize = 36,
		sides = ['n', 'e', 's', 'w'], // used for legends
		rowClassPrefix = 'pgn-prow-',
		fileClassPrefix = 'pgn-pfile-',
		allFilesAndColumnClasses = "01234567"
			.split("")
			.map( function( i ) { return rowClassPrefix + i + ' ' + fileClassPrefix + i; } )
			.join(" "),
		hiddenPiece = 'pgn-piece-hidden',
		chessboardClass = 'pgn-board-img',
		resetGameButtonClass = 'pgn-button-tostart',
		ffButtonClass = 'pgn-button-toend',
		advanceButtonClass = 'pgn-button-advance',
		retreatButtonClass = 'pgn-button-retreat',
		playButtonClass = 'pgn-button-play',
		fasterButtonClass = 'pgn-button-faster',
		slowerButtonClass = 'pgn-button-slower',
		flipBoardButtonClass = 'pgn-button-flip',
		ccButtonClass = 'pgn-button-cc',

		mw = window.mw,
		$ = window.$,
		domParser = new DOMParser(),
		mobile = mw.config.get('skin') === 'minerva';
	
// some global, utility functions.
    function bindex(file, row) { return row == undefined ? file : 8 * file + row; }
	function file(ind) { return Math.floor(ind / 8);}
	function row(ind) { return ind % 8; }
	function sign(a, b) { return a == b ? 0 : (a < b ? 1 : -1); }
	function fileOfStr(file) { return file && file.charCodeAt(0) - acode;}
	function rowOfStr(row) { return row && (row - 1);}
	function indexOfMoveNotation(notation) {
		var match = notation.match( /(\d+)([ld])/ );
		if (match) return ( parseInt( match[1] ) - 1 ) * 2 + ( match[2] === 'l' ? 1 : 2 );
		return 0;
	}
	function boardToFen(board) {
		var res = [],
		len = function(s) { return s.length; };
 
		for (var r = 0; r < 8; r++) {
			var row = '';
			for (var f = 0; f < 8; f++)  
				row += board[bindex(f, r)] ? board[bindex(f, r)].fen() : ' ';
			res.push(row.replace(/(\s+)/g, len));
		}
		return res.reverse().join('/'); // fen begins with row 8 file a - go figure...
	}
	
// Classes
	function Button( className, action, stateful ) {
		var button = this;
		$.extend( button, {
			state: 0,
			setState: function( state ) {
				var oldState = this.state;
				state = 0 + !!state;
				this.state = state;
				if ( stateful )
					this.elem
						.toggleClass( 'pgn-image-button-on', !!state )
						.toggleClass( 'pgn-image-button-off', !state );
				if ( ( !stateful || state != oldState ) && typeof( action ) == 'function' )
					action( state );
			},
			setVisible: function( visible ) {
				this.elem.toggle( !! visible );
			},
			elem: $( '<div>' )
				.addClass( 'pgn-image-button pgn-image-button-off ' + className )
				.click( function() {
					button.setState( ! button.state );
				} )
		} );
	}	

	function Gameset( wrapperDiv ) { // set of functions and features that depend on blocksize, and currentGame.
		var gameSet = this;

		$.extend(gameSet, {
			wrapperDiv: wrapperDiv,
			tabberDiv: null,
			blockSize: defaultBlockSize,
			allGames: [],
			currentGame: null,
			showDetails:false,
			timer: null,
			autoPlayDelay: 750,
			// actions
			faster: function() { 
				gameSet.autoPlayDelay -= 500; 
				if (gameSet.autoPlayDelay < 500) gameSet.autoPlayDelay = 500;
				gameSet.reportDelay();
			},
			slower: function() { 
				gameSet.autoPlayDelay += 500; 
				gameSet.reportDelay(); 
			},
			reportDelay: function() {
				gameSet.toggleAutoPlay(); // no param means keep state, but use new delay
				var message = gameSet.config.delay_msg 
					? gameSet.config.delay_msg.replace('$sec$', 0.001 * gameSet.autoPlayDelay)
					: 0.001 * gameSet.autoPlayDelay;
				mw.notify( message, { tag: 'delay' } ); 
				// eventurally use config and format better message. 
			},
			// 6 is half letter size (assuming font-size 0.875em)
			top: function(row, l) { return (((this.isFlipped ? row : (7 - row)) + (l ? 0.3 : 0)) * this.blockSize + (l? boardPadding-6: boardPadding)) + 'px'; },
			left: function(file, l) { return (((this.isFlipped ? 7 - file : file) + (l ? 0.5 : 0)) * this.blockSize + (l? boardPadding-6: boardPadding)) + 'px'; },
			legendLocation: function(side, num) {
				switch (side) { 
					case 'n': return {top: 0, left: this.left(num, true)};
					case 'e': return {top: this.top(num, true), left: this.blockSize * 8 + boardPadding + 5};
					case 's': return {top: this.blockSize * 8 + 20, left: this.left(num, true)};
					case 'w': return {top: this.top(num, true), left: 5};
				}
			},
			relocateLegends: function() {
				for (var si in sides)
					for (var n = 0; n < 8; n++)
						this[sides[si]][n].css(this.legendLocation(sides[si], n));
			},
			selectGame: function(val) {
				var game = this.allGames[val];
				if (game) {
					game.analyzePgn();
					this.currentGame = game;
					this.ccButton.setVisible( game.hasComments() );
					game.show();
				}
			},
			refreshFEN: function() {
				var board = this.currentGame.boards[this.currentGame.index];
				this.fenDiv.text( boardToFen(board) );
			},
			drawIfNeedRefresh: function() {
				if (this.currentGame)
					this.currentGame.drawBoard();
			},
			changeAppearance: function() {
				this.currentGame.drawBoard();
				this.relocateLegends();
			},
			setWidth: function(width) {
				width = width || this.blockSize;
				var
					widthPx = width * 8,
					widthPxPlus = widthPx + 40;
				this.tabberDiv // disgusting, but i could not get heightStyle of jquery tabs to do what i need.
					.css( { height: widthPxPlus } )
					.find( 'div' ).css( { height: mobile ? widthPxPlus : widthPx - 20 } );
				this.blockSize = width;
				this.piecesDiv.css({width: widthPx, height: widthPx});
				this.boardDiv.css({width: widthPxPlus, height: widthPxPlus});
				this.changeAppearance();
			},
			hideComments: function( state ) {
				this.wrapperDiv.toggleClass( 'pgn-comments-hidden', state );
			},
			isFlipped: false,
			doFlip: function( state ) {
				this.isFlipped = state;
				this.changeAppearance();
			},
			playing: false,
			toggleAutoPlay: function( state ) {
				clearInterval(this.timer);
				if (state == undefined) state = this.playing;
				this.playing = state;
				if ( state ) {
					this.currentGame.wrapAround();
					this.timer = setInterval(function() { gameSet.currentGame.advance() }, gameSet.autoPlayDelay);
				}
			},
			stopAutoPlay: function() {
				gameSet.autoPlayButton.setState( false );
			}
		});
	}
 
	function ChessPiece(type, color, game) {
		this.game = game;
		this.type = type;
		this.color = color;
		this.avatar = $('<div>')
			.addClass('pgn-chessPiece pgn-ptype-color-' + type + color)
			.on('transitionstart', function(){ $(this).addClass('moving'); } ) //supposedly elevates z-index
			.on('transitionend', function(){ $(this).removeClass('moving'); } );
		var piece = this;
		$.extend( piece, {
			appear: function(file, row) {
				if (game.gs.isFlipped) {
					file = 7 - file;
					row = 7 - row;
				}
				this.avatar
					.removeClass(hiddenPiece)
					.removeClass(allFilesAndColumnClasses)  // remove them all
					.addClass(rowClassPrefix + row)			// 
					.addClass(fileClassPrefix + file);
			},
			disappear: function() { return this.avatar.addClass( hiddenPiece ); },
			setSquare: function( file, row ) {
				this.file = file;
				this.row = row;
				this.onBoard = true;
			},
			capture: function( file, row ) {
				if (this.type == 'p' && !this.game.pieceAt(file, row))  // en passant
					this.game.clearPieceAt(file, this.row);
				else
					this.game.clearPieceAt(file, row);
				this.move(file, row);
			},
			move: function(file, row) {
				// with chess960 castling, we sometimes have to test.
				if ( this.game.pieceAt( this.file, this.row ) == this ) 
					this.game.clearSquare(this.file, this.row);
				this.game.pieceAt(file, row, this); // place it on the board)
			},
			pawnDirection: function() { return this.color == WHITE ? 1 : -1; },
			toString: function() { return this.type + this.color; }, 
			fen: function() { return this.color == WHITE ? this.type.toUpperCase() : this.type; },
			pawnStart: function() { return this.color == WHITE ? 1 : 6; },
			remove: function() { this.onBoard = false; },
			canMoveTo: function(file, row, capture) {
				if (!this.onBoard)
					return false;
				var rd = Math.abs(this.row - row), fd = Math.abs(this.file - file);
				switch(this.type) {
					case 'n':
						return rd * fd == 2; // how nice that 2 is prime: its only factors are 2 and 1....
					case 'p':
						var dir = this.pawnDirection();
						return (
							((this.row == this.pawnStart() && row ==  this.row + dir * 2 && !fd && this.game.roadIsClear(this.file, file, this.row, row) && !capture)
							|| (this.row + dir == row && fd == !!capture))); // advance 1, and either stay in file and no capture, or move exactly one
					case 'k':
						return (rd | fd) == 1; // we'll accept 1 and 1 or 1 and 0.
					case 'q':
						return (rd - fd) * rd * fd == 0 && this.game.roadIsClear(this.file, file, this.row, row); // same row, same file or same diagonal.
					case 'r':
						return rd * fd == 0 && this.game.roadIsClear(this.file, file, this.row, row);
					case 'b':
						return rd == fd && this.game.roadIsClear(this.file, file, this.row, row);
				}
			}, // function canMoveTo
			matches: function(oldFile, oldRow, isCapture, file, row) {
				if (typeof oldFile == 'number' && oldFile != this.file)
					return false;
				if (typeof oldRow  == 'number' && oldRow != this.row)
					return false;
				return this.canMoveTo(file, row, isCapture);
			}
		} ); // extend
	}
 
 
	function Game(gameSet) {
		$.extend(this, {
			board: [],
			boards: [],
			pieces: [],
			notations: [],
			moves: [],
			index: 0,
			piecesByTypeCol: {},
			descriptions: {},
			comments: [],
			analyzed: false,
			gs: gameSet});
	}
	
	Game.prototype.moveLinkText = function(notation, color) {
		var config = this.gs.config,
			tpiece = config && config.translate && config.translate.piece,
			tfile = config && config.translate && config.translate.file,
			trow = config && config.translate && config.translate.row;
		if (tpiece) {
			tpiece =   color == WHITE && tpiece.white 
					|| color == BLACK && tpiece.black
					|| tpiece;
			try {
				var regex = new RegExp('(' + Object.keys(tpiece).join("|") + ')', 'g');
				notation = notation.replace(regex, function(c) { return tpiece[c] || c; } );
			} catch (e) {
				mw.log('bad config.translate.pieces');
				throw e;
			}
		}
		
		if (tfile) {
			try {
				notation = notation.replace(/[abcdefgh]/g, function(c) { return tfile[c] || c; } );
			} catch (e) {
				mw.log('bad config.translate.file');
				throw e;
			}
		}
		if (trow) {
			try {
				notation = notation.replace(/[12345678]/g, function(c) { return trow[c] || c; } );
			} catch (e) {
				mw.log('bad config.translate.row');
				throw e;
			}
		}

		return $.trim(notation.replace(/-/g, '\u2011')) + ' ';
	}
 
	Game.prototype.show = function() {
		var desc = $.extend({}, this.descriptions),
			rtl = desc['Direction'] == 'rtl',
			gs = this.gs;
 
		// cleanup from previous game.
		gs.stopAutoPlay();

		// setup descriptions
		delete desc['Direction'];
		gs.descriptionsDiv
			.empty()
			.css( { direction: rtl ? 'rtl' : 'ltr', textAlign: rtl ? 'right' : 'left' } );
		$.each(desc, function(key, val) { 
			var line = mw.html.escape(key + ': ' + val)  + '<br />';
			gs.descriptionsDiv.append(line); 
		} );
 
		// setup pgn section
		gs.pgnDiv.empty().append( this.notations );
 
		// set the board. 
		var hiddenAvatars = this.pieces.map( function(piece) { return piece.disappear(); } );
		this.gs.piecesDiv.empty().append( hiddenAvatars );
		
		this.drawBoard();
	}
 
    Game.prototype.done = function() { return this.boards.length - 1 <= this.index; }
 
	Game.prototype.pieceAt = function(file, row, piece) {
		var i = bindex(file, row);
		if (piece) {
			this.board[i] = piece;
			piece.setSquare(file, row);
		}
		return this.board[i];
	}
 
	Game.prototype.clearSquare = function(file, row) {
		delete this.board[bindex(file, row)];
	}
 
	Game.prototype.clearPieceAt = function(file, row) {
		var piece = this.pieceAt(file, row);
		
		if (piece)
			piece.remove();
		this.clearSquare(file, row);
	}
 
	Game.prototype.roadIsClear = function(file1, file2, row1, row2) {
		var file = file1, 
			row = row1, 
			steps = 0,
			dfile = sign(file1, file2),
			drow = sign(row1, row2);
		while (true) {
			file += dfile;
			row += drow;
			if (file == file2 && row == row2)
				return true;
			if (this.pieceAt(file, row))
				return false;
			if (steps++ > 10)
				throw 'something is wrong in function roadIsClear.' +
					' file=' + file + ' file1=' + file1 + ' file2=' + file2 +
					' row=' + row + ' row1=' + row1 + ' row2=' + row2 +
					' dfile=' + dfile + ' drow=' + drow;
		}
	};
 
	Game.prototype.addPieceToDicts = function(piece) {
		this.pieces.push(piece);
		var type = piece.type, color = piece.color;
		var byType = this.piecesByTypeCol[type];
		if (! byType)
			byType = this.piecesByTypeCol[type] = {};
		var byTypeCol = byType[color];
		if (!byTypeCol)
			byTypeCol = byType[color] = [];
		byTypeCol.push(piece);
	};
 
	Game.prototype.advance = function(delta) {
		var m = this.index + (delta || 1); // no param means 1 forward.
		if (0 <= m && m < this.boards.length) {
			this.drawBoard(m);
		} else this.gs.autoPlayButton.setState(false);
	}
 
	Game.prototype.showCurrentMoveLink = function() {
		var moveLink = this.moves[this.index];
		if (moveLink) {
			moveLink.addClass('pgn-current-move').siblings().removeClass('pgn-current-move');
			var wannabe = moveLink.parent().height() / 2,
				isNow = moveLink.position().top,
				newScrolltop = moveLink.parent()[0].scrollTop + isNow - wannabe;
			moveLink.parent().stop().animate({scrollTop: newScrolltop}, 500);
		}
	}
 
	Game.prototype.drawBoard = function(index) {
		if ( index == undefined) index = this.index;
		if ( index < 0 ) index += this.boards.length;

		this.index = index;
		
		var board = this.boards[index];
		
		for (var i in this.pieces) this.pieces[i].disappear();
		for (var i in board) if (board[i]) board[i].appear(file(i), row(i));
		this.showCurrentMoveLink();
		this.gs.refreshFEN();
	}
 
	Game.prototype.wrapAround = function() {
		if (this.index >= this.boards.length - 1)
			this.drawBoard(0);
	}

    Game.prototype.castle = function( color, side, kingTargetFile, rookTargetFile ) {
		var king = this.piecesByTypeCol['k'][color][0],
		// when game starts from fen, it's possible that no "quin side" rook found fefore king-side rook, 
		// we expect king-side rook to be in slot "1", but in this case, it will be in 0
            rook = this.piecesByTypeCol['r'][color][side] || this.piecesByTypeCol['r'][color][0]; 
		if (!rook || rook.type != 'r')
			throw 'attempt to castle without rook on appropriate square';
		king.move(fileOfStr(kingTargetFile), king.row);
		rook.move(fileOfStr(rookTargetFile), rook.row);
        
    }
    
	Game.prototype.kingSideCastle = function(color) {
        this.castle( color, 1, 'g', 'f' );
	}
 
	Game.prototype.queenSideCastle = function(color) {
        this.castle( color, 0, 'c', 'd' );
	}
 
	Game.prototype.promote = function(piece, type, file, row, capture) {
		piece[capture ? 'capture' : 'move'](file, row);
		this.clearPieceAt(file, row);
		var newPiece = this.createPiece(type, piece.color, file, row);
	}
 
	Game.prototype.createPiece = function(type, color, file, row) {
		var piece = new ChessPiece(type, color, this);
		this.pieceAt(file, row, piece);
		this.addPieceToDicts(piece);
		return piece;
	}
 
	Game.prototype.createMove = function(color, moveStr) {
		moveStr = moveStr.replace(/^\s+|[!?+# ]*(\$\d{1,3})?$/g, ''); // check, mate, comments, glyphs.
		if (!moveStr.length)
			return false;
		if ($.inArray(moveStr, ['O-O', '0-0']) + 1)
			return this.kingSideCastle(color);
		if ($.inArray(moveStr, ['O-O-O', '0-0-0']) + 1)
			return this.queenSideCastle(color);
		if ($.inArray(moveStr, ['1-0', '0-1', '1/2-1/2', '*']) + 1)
			return moveStr; // end of game - white wins, black wins, draw, game halted/abandoned/unknown.
		var match = moveStr.match(/([RNBKQ])?([a-h])?([1-8])?(x)?([a-h])([1-8])(=[RNBKQ])?/);
		
		if (!match) return false;
 
		var type = match[1] ? match[1].toLowerCase() : 'p',
			oldFile = fileOfStr(match[2]),
			oldRow = rowOfStr(match[3]),
			isCapture = !!match[4],
			file = fileOfStr(match[5]),
			row = rowOfStr(match[6]),
			promotion = match[7],
			thePiece = $(this.piecesByTypeCol[type][color]).filter(function() {
					return this.matches(oldFile, oldRow, isCapture, file, row);
				});
		if (thePiece.length != 1) {
			var ok = false;
			if (thePiece.length == 2) { // maybe one of them can't move because it protects the king?
				var king = this.piecesByTypeCol['k'][color][0];
				for (var i = 0; i < 2; i++) {
					var piece = thePiece[i];
					// lift the piece, check if the king is under threat
					delete this.board[bindex(piece.file, piece.row)];
					for (var j in this.board) {
						var threat = this.board[j];
						if (threat && threat.color != color && threat.canMoveTo(king.file, king.row, true)) { // found that this piece can't move, so it's the other one...
							ok = true;
							thePiece = thePiece[1-i];
							break;
						}
					}
					// put the piece back in place
					this.board[bindex( piece.file, piece.row )] = piece;
					if (ok)
						break;
				}
 
			}
			if (!ok)
				throw 'could not find matching pieces. type="' + type + ' color=' + color + ' moveAGN="' + moveStr + '". found ' + thePiece.length + ' matching pieces';
		}
		else
			thePiece = thePiece[0];
		if (promotion)
			this.promote(thePiece, promotion.toLowerCase().charAt(1), file, row, isCapture);
		else if (isCapture)
			thePiece.capture(file, row);
		else
			thePiece.move(file, row);
		return moveStr;
	}
	
	Game.prototype.addComment = function(str) {
		if ( ! str ) return;
		this.notations.push( $( '<p>' )
			.addClass( 'pgn-comment' )
			.text( str.replace( /[{}()]/g, '' ) )
		);
	}

	Game.prototype.addDescription = function(description) {
		description = $.trim(description);
		var match = description.match(/\[([^"]+)"(.*)"\]/);
		if (match)
			this.descriptions[$.trim(match[1])] = match[2];
	}
 
	Game.prototype.description = function() {
		var d = this.descriptions,
			event = d['Event'] || d['אירוע'],
			round =  d['Round'] ||  d['סיבוב'],
			white = d['White'] || d['לבן'],
			black = d['Black'] || d['שחור'],
			name = d['Name'] || d['שם'];
			return name
				|| ( event ? event + ': ' : '')
					+ (white ? white : '')
					+ (white || black ? ' – ' : '')
					+ (black ? black : '')
					+ (round ? ' (' + round + ')' : '');
	}
  
	Game.prototype.preAnalyzePgn = function(pgn) {
		function tryMatch(regex) {
			var match = pgn.match(regex);
            if (match)
                pgn = pgn.replace( match, '' );
			return match && match[0];
		}
        
        var match;
 		while (match = tryMatch(/^\s*\[[^\]]*\]/))
			this.addDescription(match);
		this.pgn = pgn; 
	}

	Game.prototype.analyzePgn = function() {
		if (this.analyzed) return;
		this.analyzed = true;
		var
			match,
			turn,
			moveNum = '',
			game = this,
			pgn = this.pgn;
 
		function removeHead(match) {
			var ind = pgn.indexOf(match) + match.length;
			pgn = pgn.substring(ind);
			return match;
		}
 
		function tryMatch(regex) {
			var rmatch = pgn.match(regex);
			if (rmatch) {
				removeHead(rmatch[0]);
				moveNum = rmatch[1] || moveNum;
			}
			return rmatch && rmatch[0];
		}
		
		function addMoveLink(str, isMove, color) {
			
			var notation = $( '<span>' )
				.addClass( isMove ? 'pgn-movelink' : 'pgn-steplink' )
				.text( game.moveLinkText( str, color ) )
			game.notations.push( notation );
			
			if ( isMove ) {
				game.boards.push( game.board.slice() );
				game.moves.push( notation );
			} else if ( game.moves.length == 0 )
				game.moves.push( notation );
			
			var index = game.boards.length - 1;
			notation.on( 'click', function() { 
				game.gs.stopAutoPlay();
				game.drawBoard(index); 
			} ); 
		}
        
		pgn = pgn.replace(/;(.*)\n/g, ' {$1} ').replace(/\s+/g, ' '); // replace to-end-of-line comments with block comments, remove newlines and noramlize spaces to 1
		this.populateBoard( this.descriptions.FEN || 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR' );
		this.boards.push(this.board.slice());
		var prevLen = -1;
		while (pgn.length) {
			if (prevLen == pgn.length)
				throw "analysePgn encountered a problem. pgn is: " + pgn;
			prevLen = pgn.length;
			this.addComment( tryMatch( /^\s*\{[^\}]*\}\s*/ ) );
			this.addComment( tryMatch( /^\s*\([^\)]*\)\s*/ ) );
			if (match = tryMatch(/^\s*(\d+)\.+/)) {
				turn = /\.{3}/.test(match) ? BLACK : WHITE;
				addMoveLink(match, false, turn);
				continue;
			}
			if (match = tryMatch(/^\s*[^ ]+ ?/)) {
				this.createMove(turn, match);
				addMoveLink(match, true, turn);
				turn = BLACK;
			}
		}
		
		this.index = this.descriptions.FirstMove
			? indexOfMoveNotation(this.descriptions.FirstMove)
			: this.descriptions.FEN ? 0 : this.boards.length - 1;
	}
 
	Game.prototype.populateBoard = function(fen) {
		var fenar = fen.split(/[\/\s]/);
		if (fenar.length < 8)
            throw 'illegal fen: "' + fen + '"';
		for (var row = 0; row < 8; row++) {
			var file = 0;
			var filear = fenar[row].split('');
			for (var i in filear) {
				var p = filear[i], lp = p.toLowerCase();
				if (/[1-8]/.test(p))
					file += parseInt(p, 10);
				else if (/[prnbkq]/.test(lp))
					this.createPiece(lp, (p == lp ? BLACK : WHITE), file++, 7-row)
				else
					throw 'illegal fen: "' + fen + '"';
			}
		}
	}
	
	Game.prototype.hasComments = function() {
		var hasComment = function( n ){ return n.hasClass( 'pgn-comment' ); };
		return !! this.notations.filter( hasComment ).length;
	}

	function buildBoardDiv(container, selector, gameSet, ind) {
		var
			id = container.attr( 'id' ) || 'pgn-viewer-' + ind,
			config = gameSet.config = container.data( 'config' ) || {},
			notationId = 'pgn-notation-' + id,
			infoId = 'pgn-info-' + id,
			fenId = 'pgn-fen-' + id,
			controlsDiv,
			createBotton = function( className, param, todraw ) {
				return new Button( className, 
					function() {
						gameSet.stopAutoPlay();
						if ( todraw ) gameSet.currentGame.drawBoard( param )
						else gameSet.currentGame.advance( param );
					} )
			},
			gotoend = createBotton( ffButtonClass, -1, true ),
			forward = createBotton( advanceButtonClass,  1 ),
			backstep = createBotton( retreatButtonClass, -1 ),
			gotostart = createBotton( resetGameButtonClass, 0, true ),
			flip = new Button( flipBoardButtonClass, function( state ){ gameSet.doFlip( state ); }, true ),
			slower = new Button( slowerButtonClass, function(){ gameSet.slower(); } ),
			faster = new Button( fasterButtonClass, function(){ gameSet.faster(); } ),
			autoplay = new Button( playButtonClass, function( state ){ gameSet.toggleAutoPlay( state ); }, true ),
			commentsToggle = new Button( ccButtonClass, function( state ){ gameSet.hideComments( state ); }, true ),
			tabnames = $.extend( {
				notation: 'Game Notation',
				metadata: 'Information',
				fen: 'FEN' }, 
				config.tab_names );
		gameSet.autoPlayButton = autoplay;
		gameSet.ccButton = commentsToggle
		gameSet.descriptionsDiv = $('<div>', {'class': 'pgn-descriptions', id: infoId })
		gameSet.fixedDelay = 'delay' in config;
		if ( gameSet.fixedDelay ) gameSet.autoPlayDelay = Math.max(500, config.delay);
		
		if ( $( '#' + notationId ) ) notationId += '_1';
		gameSet.pgnDiv = $('<div>', {'class': 'pgn-pgndiv', id: notationId } );
 		gameSet.blockSize = Math.max( minBlockSize, Math.min( maxBlockSize, config.squareSize || defaultBlockSize ) );
		gameSet.fenDiv = $('<div>', { id: fenId } )
			.css( { 'word-wrap': 'break-word' } ); 
		gameSet.tabberDiv = $( '<div>', { 'class': 'pgn-tabber' } );
		if ( mobile ) {
			gameSet.tabberDiv
				.append( gameSet.pgnDiv );
		} else {
			gameSet.tabberDiv
				.append($( '<ul>' )
					.append( $( '<li>' ).append( $( '<a>', { href: '#' + notationId } ).text( tabnames.notation ) ) ) 
					.append($('<li>').append($('<a>', { href: '#' + infoId }).text(  tabnames.metadata ) ) )
					.append($('<li>').append($('<a>', { href:'#' + fenId }).text( tabnames.fen ) ) )
				)
				.append( gameSet.pgnDiv )
				.append( gameSet.descriptionsDiv )
				.append( gameSet.fenDiv )
				.tabs();
		}
		var buttons = gameSet.fixedDelay 
			? [gotostart, backstep, autoplay, forward, gotoend, flip, commentsToggle]
			: [gotostart, backstep, slower, autoplay, faster, forward, gotoend, flip, commentsToggle]
			
		controlsDiv = $('<div>', {'class': 'pgn-controls'})
			.css( { textAlign: 'center' } ) // todo: move to css
			.append( buttons.map( function(x){ return x.elem; } ) );

		gameSet.boardDiv = $('<div>')
			.addClass('pgn-board-div');

		gameSet.piecesDiv = $('<div>').css({position:'absolute', left: '20px', top: '20px' })
			.addClass( chessboardClass )
			.appendTo(gameSet.boardDiv);
		
		var fl = 'abcdefgh'.split('');
		var fileCaption = config && config.translate && config.translate.file;
		if (fileCaption) {
			fl = fl.map(function(c) { return fileCaption[c] || '' ; } );
		}
 		var rl = '12345678'.split('');
		var rowCaption =  config && config.translate && config.translate.row;
		if (rowCaption) {
			rl = rl.map(function(c) { return rowCaption[c] || '' ; } );
		}
		
		for (var side in sides) {
			var
				s = sides[side],
				isFile = /n|s/.test(s);
			gameSet[s] = [];
			for (var i = 0; i < 8; i++) {
				var sp = $('<span>', {'class': isFile ? 'pgn-file-legend' : 'pgn-row-legend'})
					.text(isFile ? fl[i] : rl[i])
					.appendTo(gameSet.boardDiv)
					.css(gameSet.legendLocation(s, i));
				gameSet[s][i] = sp;
			}
		}
		
		container
			.append( selector || '' )
			.append($('<div>')
				.append(gameSet.boardDiv)
				.append( gameSet.tabberDiv )
				.append(controlsDiv)
			);
	}
 
	function doIt() {
		$(wrapperSelector).each(function( ind ) {
			var
				wrapperDiv = $(this),
				initial = wrapperDiv.text(),
				pgnSource = $('div.pgn-sourcegame', wrapperDiv),
				selector,
				gameSet = new Gameset( wrapperDiv );
			try {
				if (pgnSource.length > 1)
					selector = $('<select>', { 'class': 'pgn-selector' } )
						.change( function() { gameSet.selectGame(this.value); } );

				buildBoardDiv(wrapperDiv, selector, gameSet, ind);
				var game, ind = 0;
				pgnSource.each(function() {
					try {
						game = new Game(gameSet);
						game.preAnalyzePgn($(this).text());
						wrapperDiv.data({currentGame: game});
						ind++;
						gameSet.allGames.push(game);
						if (selector)
							selector.append($('<option>', {value: gameSet.allGames.length - 1, text: game.description()})
								.css('direction', game.descriptions['Direction'] || 'ltr')
							);
					} catch (e) {
						mw.log('exception in game ' + ind + ' problem is: "' + e + '"');
						if (game && game.descriptions)
							for (var d in game.descriptions)
								mw.log(d + ':' + game.descriptions[d]);
					}
				});
				gameSet.selectGame(0);
				gameSet.setWidth();
			} catch(e) {
				console.error(e);
				console.error( 'exception analyzing game :', initial );
				wrapperDiv.empty();
			}
		})
	}
 
	if ( $(wrapperSelector, $content).length) {
		if ( mobile )
			doIt();
		else
			mw.loader.using( 'jquery.ui' ).done( doIt );
	}
});