From: Han Holl <han.holl@...>
Date: 2003-03-28T07:02:09+09:00
Subject: How to call super with different arguments


Some code:

class Awk < String
   include Comparable
   @@intpattern = /^\s*[-+]?\d+$/
   @@casesensitive = false

   def self.casesensitive(val)
     @@casesensitive = val
   end

   def initialize(str)
     super(str.to_s)
   end

   def <=>(other)
     if @@intpattern =~ self && @@intpattern =~ other
       to_i <=> other.to_i
     else
       if @@casesensitive
         super
       else
         # What to use here ?
         String.new(downcase) <=> String.new(other.downcase)
       end
     end
   end

   def ==(other)
     (self <=> other) == 0
   end
end

a = Awk.new('a')
b = Awk.new('A')

if a == b
   puts 'equal'
end
a = Awk.new('21')
b = Awk.new('3')
if a > b
   puts "OK"
end

The problem I'm having is in the case insensitive case: it's somehow
asymmetrical: while to_i return an integer, to_s does  _not_ return a
String but an Awk (as does downcase).
This means I can't use
    downcase <=> other.downcase
as I's like to. Is it possible to use some variation of super ?
The above construct works, but strikes me as expensive and clumsy.

Han Holl