From: wys@... (Clemens Wyss)
Date: 2001-02-06T16:10:03+09:00
Subject: [ruby-talk:10405] Re: Nested modules and classes?

STRATEGY PATTERN?

"Ben Tilly" <ben_tilly@hotmail.com> wrote in
<LAW2-F64R6IHupeyyfI0000484b@hotmail.com>: 

<<SNIP>>
>    class RecDescent
>
>      # Try these rules in order
>      class Alt
<<SNIP>>
>
>        def parse (str, pos=0)
<<SNIP>>
>        end
>      end
>
>      # Match all rules in turn
>      class InOrder
<<SNIP>>
>
>        def parse (str, pos=0)
<<SNIP>>
>        end
>      end
>
>
>      # And so on, more classes for each type of rule
>
>    end
>
Why not have a base (strategy) class, say RecDescentParseStrategy, on the
"same level" as RecDescent and let Alt and InOrder (and ...) be
subclasses of RecDescentParseStartegy? At least the attr_accessor and the
initialize method could be inherited. 

Clemens