# File lib/mail/parsers/rfc2822.rb, line 5175
    def _nt_no_fold_quote
      start_index = index
      if node_cache[:no_fold_quote].has_key?(index)
        cached = node_cache[:no_fold_quote][index]
        if cached
          cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
          @index = cached.interval.end
        end
        return cached
      end

      i0, s0 = index, []
      r1 = _nt_DQUOTE
      s0 << r1
      if r1
        s2, i2 = [], index
        loop do
          i3 = index
          r4 = _nt_qtext
          if r4
            r3 = r4
          else
            r5 = _nt_quoted_pair
            if r5
              r3 = r5
            else
              @index = i3
              r3 = nil
            end
          end
          if r3
            s2 << r3
          else
            break
          end
        end
        if s2.empty?
          @index = i2
          r2 = nil
        else
          r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
        end
        s0 << r2
        if r2
          r6 = _nt_DQUOTE
          s0 << r6
        end
      end
      if s0.last
        r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
        r0.extend(NoFoldQuote0)
      else
        @index = i0
        r0 = nil
      end

      node_cache[:no_fold_quote][start_index] = r0

      r0
    end