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

        protected internal virtual int PreviousTokenOnChannel(int i, int channel)
        {
            Sync(i);
            if (i >= Size)
            {
                // the EOF token is on every channel
                return Size - 1;
            }
            while (i >= 0)
            {
                IToken token = tokens[i];
                if (token.Type == TokenConstants.EOF || token.Channel == channel)
                {
                    return i;
                }
                i--;
            }
            return i;
        }