literal (Randexp::Reducer)

    # File lib/randexp/reducer.rb, line 24
        def self.literal(cell, quantity = nil)
          case quantity
          when '?''?'         then ([''] + cell).pick * ''
          when :+, '+?''+?'    then raise "Sorry, \"#{cell * ''}+\" is too vague, try setting a range: \"#{cell * ''}{1,3}\""
          when :*, '*?''*?'    then raise "Sorry, \"#{cell * ''}*\" is too vague, try setting a range: \"#{cell * ''}{0,3}\""
          when Range        then quantity.pick.of { cell * '' } * ''
          when Integer      then quantity.of { cell * '' } * ''
          when nil          then cell * ''
          end
        end