Antlr4.Runtime.BufferedTokenStream.Fetch C# (CSharp) Method

        protected internal virtual int Fetch(int n)
        {
            if (fetchedEOF)
            {
                return 0;
            }
            for (int i = 0; i < n; i++)
            {
                IToken t = _tokenSource.NextToken();
                if (t is IWritableToken)
                {
                    ((IWritableToken)t).TokenIndex = tokens.Count;
                }
                tokens.Add(t);
                if (t.Type == TokenConstants.EOF)
                {
                    fetchedEOF = true;
                    return i + 1;
                }
            }
            return n;
        }