public static IEnumerable <PgnTurn> Parse(string text, out PgnGameResult result)
{
var moveText = text.Replace("\r", " ").Replace("\n", " ");
var tokens = new Stack <string>(moveText.Split(new[] { ' ', '\t', '.' }).Where(s => s.Trim().Any()).Reverse());
var turns = new List <PgnTurn>();
PgnMove white = null;
PgnMove black = null;
var annotationToken = false;
var annotation = "";
var turnIdx = 0;
result = PgnGameResult.Unknown;
while (tokens.Any())
{
// Number, '{}', Alpha, PgnGameResult
var token = tokens.Pop();
var tokenType = PgnTurnTokenParser.GetTokenType(token);
if (annotationToken && tokenType != PgnTurnTokenTypes.AnnotationEnd)
{
annotation = string.IsNullOrEmpty(annotation)
? token
: $"{annotation} {token}";
continue;
}
switch (tokenType)
{
case PgnTurnTokenTypes.AnnotationStart:
if (token.Length > 1)
{
tokens.Push(token.Substring(1));
}
annotationToken = true;
break;
case PgnTurnTokenTypes.AnnotationEnd:
if (token.Length > 1)
{
tokens.Push("}");
tokens.Push(token.Substring(0, token.Length - 1));
}
else
{
annotationToken = false;
if (white != null && black == null)
{
white.Annotation = annotation;
}
else if (black != null)
{
black.Annotation = annotation;
}
annotation = null;
}
break;
case PgnTurnTokenTypes.TurnStart:
{
if (white != null && black != null)
{
turns.Add(new PgnTurn(turnIdx, white, black));
white = black = null;
annotation = null;
}
turnIdx = token.ToInt();
break;
}
case PgnTurnTokenTypes.Notation when white == null:
white = new PgnMove(token, annotation);
break;
case PgnTurnTokenTypes.Notation:
black = new PgnMove(token, annotation);
break;
case PgnTurnTokenTypes.GameResult:
result = PgnTurnTokenParser.ParseResult(token);
turns.Add(new PgnTurn(turnIdx, white, black));
white = black = null;
annotation = null;
break;
default:
throw new Exception($"Unexpected tokenType '{tokenType}'");
}
}
if (white != null)
{
if (turns.All(t => t.Turn != turnIdx))
{
turns.Add(new PgnTurn(turnIdx, white, black));
}
}
return(turns);
}
public PgnTurn(int turn, PgnMove white, PgnMove black)
{
Turn = turn;
White = white;
Black = black;
}