From: Nasir Khan <rubylearner@...>
Date: 2007-03-31T05:54:42+09:00
Subject: Find the fully qualified name of a class from a string

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Say you have a class definition in a string -

str = <<EOF
module A
   class B
     def b
       puts "hello"
     end
  end
end
EOF

What is the easiest way to find out the fully qualified name of the class
there, namely "A::B"

Now I could do a thing like

module EmptyModule
end

EmptyModule.module_eval(str)

def self.find_class mod
    mod.constants.each do |str|
      m = mod.const_get(str)
        if m.class == Module
          find_class(m)
        else
          cname = m.to_s
          puts cname.match(/EmptyModule::/).post_match
          break
         end
       end
   end

and call this method

find_class(EmptyModule)

which prints  "A::B"

This works but it seems too much work to do something simple.

Is there a better/simpler way to do this?

Thanks
Nasir

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