private GameVariation GetVariation(List <PGNToken> tokens, ref int i, Board position)
{
var positions = new List <Board>()
{
position
};
var variation = new GameVariation();
var token = tokens[i];
try
{
for (; i < tokens.Count; i++)
{
if (tokens[i].TokenType == PGNTokenType.End || tokens[i].TokenType == PGNTokenType.VariationEnd)
{
break;
}
var newPos = ParseToken(variation, tokens, ref i, positions, position);
if (newPos != position)
{
positions.Add(newPos);
position = newPos;
}
}
}
catch (Exception e)
{
throw new PGNException("Error parsing token", token, ParserSource.Parser, e);
}
return(variation);
}
private Board ParseToken(
GameVariation variation,
List <PGNToken> tokens,
ref int i,
List <Board> positions,
Board position)
{
var token = tokens[i];
switch (token.TokenType)
{
case (PGNTokenType.Annotation):
variation.Elements.Add(new GameAnnotation(token.Value));
break;
case (PGNTokenType.Comment):
variation.Elements.Add(new GameComment(token.Value));
break;
case (PGNTokenType.Ellipsis):
// Assert its blacks turn
if (position.PlayerTurn != Color.Black)
{
throw new PGNException("Encountered unexpected token. It should be blacks turn to play", token);
}
break;
case (PGNTokenType.Move):
position = position.Copy();
var move = MakeMove(token, position);
variation.Elements.Add(move);
break;
case (PGNTokenType.MoveNumber):
if (position.MoveCount > token.GetMoveNumber())
{
throw new PGNException("Unexpected move number", token);
}
break;
case (PGNTokenType.Results):
variation.Elements.Add(new GameResults(token.Value));
break;
case (PGNTokenType.VariationStart):
var startpos = GetStartPosition(tokens, ref i, positions);
var newVariation = GetVariation(tokens, ref i, startpos);
variation.Elements.Add(newVariation);
break;
}
return(position);
}
public static PGNGame DecodeGame(string encodedString)
{
var s = encodedString;
int i = 0;
Color player = Color.White;
int move = 1;
var moves = new List <PGNMove>();
PGNMove lastmove = null;
while (i < s.Length - 1)
{
// check if the last move wa actually a promotion
if (Decode[s[i]] == SpecialInstruction)
{
lastmove.Promotion = (Piece)Decode[s[i + 1]];
continue;
}
var from = Decode[s[i]];
var to = Decode[s[i + 1]];
lastmove = new PGNMove()
{
From = from, To = to, MoveNumber = move, Color = player /*, Piece = ...*/
};
if (player == Color.Black)
{
move++;
}
player = (player == Color.White) ? Color.Black : Color.White;
moves.Add(lastmove);
i += 2;
}
var variation = new GameVariation(moves.Select(x => (IPGNElement)x).ToList());
var game = new PGNGame(new Dictionary <string, string>(), variation);
return(game);
}
private Board ParseToken(
GameVariation variation,
List<PGNToken> tokens,
ref int i,
List<Board> positions,
Board position)
{
var token = tokens[i];
switch (token.TokenType)
{
case (PGNTokenType.Annotation):
variation.Elements.Add(new GameAnnotation(token.Value));
break;
case (PGNTokenType.Comment):
variation.Elements.Add(new GameComment(token.Value));
break;
case (PGNTokenType.Ellipsis):
// Assert its blacks turn
if (position.PlayerTurn != Color.Black)
throw new PGNException("Encountered unexpected token. It should be blacks turn to play", token);
break;
case (PGNTokenType.Move):
position = position.Copy();
var move = MakeMove(token, position);
variation.Elements.Add(move);
break;
case (PGNTokenType.MoveNumber):
if (position.MoveCount > token.GetMoveNumber())
throw new PGNException("Unexpected move number", token);
break;
case (PGNTokenType.Results):
variation.Elements.Add(new GameResults(token.Value));
break;
case (PGNTokenType.VariationStart):
var startpos = GetStartPosition(tokens, ref i, positions);
var newVariation = GetVariation(tokens, ref i, startpos);
variation.Elements.Add(newVariation);
break;
}
return position;
}
private GameVariation GetVariation(List<PGNToken> tokens, ref int i, Board position)
{
var positions = new List<Board>() { position };
var variation = new GameVariation();
var token = tokens[i];
try
{
for (; i < tokens.Count; i++)
{
if (tokens[i].TokenType == PGNTokenType.End || tokens[i].TokenType == PGNTokenType.VariationEnd)
break;
var newPos = ParseToken(variation, tokens, ref i, positions, position);
if(newPos != position)
{
positions.Add(newPos);
position = newPos;
}
}
}
catch(Exception e)
{
throw new PGNException("Error parsing token", token, ParserSource.Parser, e);
}
return variation;
}
public PGNGame(Dictionary <string, string> tags, GameVariation game)
{
Tags = tags;
Game = game;
Results = game.Elements.LastOrDefault(x => x is GameResults) as GameResults;
}
public PGNGame(Dictionary<string, string> tags, GameVariation game)
{
Tags = tags;
Game = game;
Results = game.Elements.LastOrDefault(x => x is GameResults) as GameResults;
}
public static PGNGame DecodeGame(string encodedString)
{
var s = encodedString;
int i = 0;
Color player = Color.White;
int move = 1;
var moves = new List<PGNMove>();
PGNMove lastmove = null;
while(i < s.Length - 1)
{
// check if the last move wa actually a promotion
if (Decode[s[i]] == SpecialInstruction)
{
lastmove.Promotion = (Piece)Decode[s[i + 1]];
continue;
}
var from = Decode[s[i]];
var to = Decode[s[i + 1]];
lastmove = new PGNMove() { From = from, To = to, MoveNumber = move, Color = player/*, Piece = ...*/ };
if(player == Color.Black)
move++;
player = (player == Color.White) ? Color.Black : Color.White;
moves.Add(lastmove);
i += 2;
}
var variation = new GameVariation(moves.Select(x => (IPGNElement)x).ToList());
var game = new PGNGame(new Dictionary<string, string>(), variation);
return game;
}
