1 files changed, 122 insertions, 0 deletions
diff --git a/js/pgnParser.js b/js/pgnParser.js
new file mode 100644
index 0000000..7ef8e0b
--- /dev/null
+++ b/js/pgnParser.js
@@ -0,0 +1,122 @@
+// ECMAScript 5 strict mode
+/* jshint globalstrict: true*/
+/* global WHITE,BLACK */
+"use strict";
+(function() {
+	/*
+		var WHITE = 1;
+		var BLACK = 0;
+	*/
+	function Move(piece,color,from,to,promotion,result,str) {
+		this.piece     = piece ? piece : "P";
+		this.color     = color;
+		this.from      = from;
+		this.to        = to;
+		this.promotion = promotion;
+		this.result    = result;
+		this.str       = str;
+	}
+
+	String.prototype.removeBrackets = function(open,close) {
+		var count = 0;
+		var newString = "";
+		for (var i = 0; i < this.length; i++) {
+			var c = this.charAt(i);
+			if (c === open) {
+				count++;
+				continue;
+			}
+			if (c === close)  {
+				count--;
+				continue;
+			}
+			if (count === 0) {
+				newString += c;
+			}
+		}
+		return newString;
+	};
+
+	function parsePGN(pgn) {
+		var moves = {};
+		moves.fen = null;
+		moves.sequence = [];
+		moves.startColor = WHITE;
+
+		var color = WHITE;
+
+		//var re_fen = /[pnbrqkPNBRQK1-8]+(\/[pnbrqkPNBRQK1-8]+){7} +[wb] +([KQ]{1,2}|-) *([kq]{1,2}|-)( +(([a-h][1-8])|-))? +\d+ +\d+/
+		var re_fen = /\[FEN *" *([pnbrqkPNBRQK1-8]+(?:\/[pnbrqkPNBRQK1-8]+){7} +([wb]) +(?:[KQ]{1,2}|-) *(?:[kq]{1,2}|-)(?: +(?:(?:[a-h][1-8])|-))? +\d+ +\d+) *" *\]/;
+		var match = pgn.match(re_fen);
+		if (match) {
+			moves.fen = match[1];
+			color = match[2] === "w" ? WHITE : BLACK;
+			moves.startColor = color;
+		}
+
+		var cleanPGN = pgn
+			.removeBrackets("[","]")		// removes metadata
+			.removeBrackets("{","}")		// removes comments
+			.removeBrackets("(",")")		// removes comments
+			.replace(/\$\d+/g,'')			// removes this thing
+			.replace(/\d+\.{1,3}/g,'')		// removes move numbers
+			.replace(/\s+/g,' ')			// replaces multiple whitespaces by simple spaces
+			.trim()							// removes front and back whitespaces
+			.replace(/(0-1)$/g,'')			// result black won
+			.replace(/(1-0)$/g,'')			// result white won
+			.replace(/(1\/2-1\/2)$/g,'')	// result draw
+			.replace(/(\*)$/g,'')			// result ongoing
+			.trim()
+			.split(' ');                    // split moves 
+
+		// regex for basic moves
+		//                     |pieces | |src col/row|  |dest col/row|  promo   |check|
+		var re_pieceMove    =/^([NBRQK])?([a-h]?[1-8]?)?x?([a-h][1-8])(=[NBRQK])?([+#])?/;
+		// regex for castling
+		var re_castling = "(O-O(?:-O)?)([+#])?";
+		var castling = {
+			"O-O"  : {
+				from:['e8','e1'],
+				to:['g8','g1']
+			},
+			"O-O-O":  {
+				from:['e8','e1'],
+				to:['c8','c1']
+			}
+		};
+
+		cleanPGN.forEach(function(move) {
+			var info=[];
+
+			info = move.match(re_pieceMove);
+			if(info) {
+				moves.sequence.push(new Move(
+					info[1],
+					color,
+					info[2],
+					info[3],
+					info[4],
+					info[5],
+					move
+				));
+			}
+
+			info = move.match(re_castling);
+			if(info) {
+				moves.sequence.push(new Move(
+					"K",
+					color,
+					castling[info[1]].from[color],
+					castling[info[1]].to[color],
+					undefined,
+					info[2],
+					move
+				));
+			}
+			color = 1-color;
+		});
+
+		return moves;
+	}
+	window.parsePGN = parsePGN;
+})();
+\ No newline at end of file