prepare_format

# File lib/csv/writer.rb, line 91
    def prepare_format
      @column_separator = @options[:column_separator].to_s.encode(@encoding)
      row_separator = @options[:row_separator]
      if row_separator == :auto
        @row_separator = $INPUT_RECORD_SEPARATOR.encode(@encoding)
      else
        @row_separator = row_separator.to_s.encode(@encoding)
      end
      @quote_character = @options[:quote_character]
      @force_quotes = @options[:force_quotes]
      unless @force_quotes
        @quotable_pattern =
          Regexp.new("[\r\n".encode(@encoding) +
                     Regexp.escape(@column_separator) +
                     Regexp.escape(@quote_character.encode(@encoding)) +
                     "]".encode(@encoding))
      end
      @quote_empty = @options.fetch(:quote_empty, true)
    end