# File lib/mail/parsers/rfc2045.rb, line 378
    def _nt_token
      start_index = index
      if node_cache[:token].has_key?(index)
        cached = node_cache[:token][index]
        if cached
          cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
          @index = cached.interval.end
        end
        return cached
      end

      i0 = index
      if has_terminal?('\G[\\x21-\\x27]', true, index)
        r1 = true
        @index += 1
      else
        r1 = nil
      end
      if r1
        r0 = r1
      else
        if has_terminal?('\G[\\x2a-\\x2b]', true, index)
          r2 = true
          @index += 1
        else
          r2 = nil
        end
        if r2
          r0 = r2
        else
          if has_terminal?('\G[\\x2c-\\x2e]', true, index)
            r3 = true
            @index += 1
          else
            r3 = nil
          end
          if r3
            r0 = r3
          else
            if has_terminal?('\G[\\x30-\\x39]', true, index)
              r4 = true
              @index += 1
            else
              r4 = nil
            end
            if r4
              r0 = r4
            else
              if has_terminal?('\G[\\x41-\\x5a]', true, index)
                r5 = true
                @index += 1
              else
                r5 = nil
              end
              if r5
                r0 = r5
              else
                if has_terminal?('\G[\\x5e-\\x7e]', true, index)
                  r6 = true
                  @index += 1
                else
                  r6 = nil
                end
                if r6
                  r0 = r6
                else
                  @index = i0
                  r0 = nil
                end
              end
            end
          end
        end
      end

      node_cache[:token][start_index] = r0

      r0
    end