parse_quoted_column_value

# File lib/csv/parser.rb, line 948
    def parse_quoted_column_value
      quotes = @scanner.scan_all(@quotes)
      return nil unless quotes

      @quoted_column_value = true
      n_quotes = quotes.size
      if (n_quotes % 2).zero?
        quotes[0, (n_quotes - 2) / 2]
      else
        value = quotes[0, (n_quotes - 1) / 2]
        while true
          quoted_value = @scanner.scan_all(@quoted_value)
          value << quoted_value if quoted_value
          if @backslash_quote
            if @scanner.scan(@escaped_backslash)
              if @scanner.scan(@escaped_quote)
                value << @quote_character
              else
                value << @backslash_character
              end
              next
            end
          end

          quotes = @scanner.scan_all(@quotes)
          unless quotes
            ignore_broken_line
            message = "Unclosed quoted field"
            raise MalformedCSVError.new(message, @lineno)
          end
          n_quotes = quotes.size
          if n_quotes == 1
            break
          elsif (n_quotes % 2) == 1
            value << quotes[0, (n_quotes - 1) / 2]
            break
          else
            value << quotes[0, n_quotes / 2]
          end
        end
        value
      end
    end