/// <summary>
/// Convert the given game tree into an IEnumerable of boards with respect to the given base board.
/// </summary>
/// <param name="tree">The game tree.</param>
/// <param name="baseBoard">The base board.</param>
public static IEnumerable <Board> ToBoardList(this GameTree tree, Board baseBoard)
{
Board board = baseBoard;
foreach (Node node in tree.Elements)
{
Color color = node.HasProperty("W") ? Color.W : node.HasProperty("B") ? Color.B : Color.E;
if (color == Color.E)
{
continue;
}
board = board.MakeMove(new Move(color, board.SgfToVertex(node[color.ToString()].Value)));
yield return(board);
}
}
/// <summary>
/// Creates a GameTree from the specified file.
/// </summary>
/// <param name="path">The path of the file.</param>
public static GameTree FromFile(string path)
{
string input = File.ReadAllText(path);
return(GameTree.FromString(input));
}
/// <summary>
/// Returns the corresponding game tree of a certain range in the given token list.
/// </summary>
/// <param name="tokens">The token list.</param>
/// <param name="start">The start index.</param>
/// <param name="end">The end index.</param>
public static GameTree Parse(List <Tuple <TokenType, string> > tokens, int start = 0, int end = int.MaxValue)
{
int i = start;
end = Math.Min(end, tokens.Count - 1);
GameTree tree = new GameTree();
Node node = new Node();
SgfProperty property = new SgfProperty("", "");
while (i <= end)
{
Tuple <TokenType, string> token = tokens[i];
if (token.Item1 == TokenType.Semicolon)
{
node = new Node();
tree.Elements.Add(node);
}
else if (token.Item1 == TokenType.PropIdent)
{
property = new SgfProperty(token.Item2, new List <string>());
node.Properties.Add(property);
}
else if (token.Item1 == TokenType.CValueType)
{
property.Values.Add(token.Item2);
}
else if (token.Item1 == TokenType.Parenthesis && token.Item2 == "(")
{
break;
}
else if (token.Item1 == TokenType.Parenthesis)
{
throw new ParseException("Unexpected parenthesis.");
}
i++;
}
int depth = 0;
int newstart = 0;
while (i <= end)
{
Tuple <TokenType, string> token = tokens[i];
if (token.Item1 == TokenType.Parenthesis && token.Item2 == "(")
{
depth++;
if (depth == 1)
{
newstart = i + 1;
}
}
else if (token.Item1 == TokenType.Parenthesis && token.Item2 == ")")
{
depth--;
if (depth == 0)
{
tree.SubTrees.Add(Parse(tokens, newstart, i - 1));
}
}
i++;
}
return(tree);
}
