public static While TryParse(ref Source s)
{
const string WhileName = "while";
While res = null;
if (!s.SkipIf(WhileName))
{
s.Rollback();
return(null);
}
res = new While();
res.condition = Condition.TryParse(ref s);
if (res.condition == null)
{
s.Rollback();
return(null);
}
Source tempSource = s.Clone();
res.body = StatementSequence.TryParse(ref tempSource);
s.currentPos = tempSource.currentPos;
s.Save();
return(res);
}
public static Statement TryParseAny(ref Source s)
{
Spaces.Skip(ref s);
Statement res;
s.Save();
res = If.TryParse(ref s);
if (res == null)
{
s.Rollback();
res = While.TryParse(ref s);
}
if (res == null)
{
s.Rollback();
res = Return.TryParse(ref s);
}
if (res == null)
{
s.Rollback();
res = Assignment.TryParse(ref s);
}
if (res == null)
{
s.Rollback();
res = ExprStatement.TryParse(ref s);
}
if (res == null)
{
s.Rollback();
s.SkipIf(";");
}
s.Check(res);
return(res);
}