[ruby-talk:9295] Re: Class from name of class

> I have to say that this concept strikes me as being really very
> risky. However...
>      def forName(className)
>        ObjectSpace.each_object(Class) do |c|
>          return c if c.name == className
>        end
>        raise "Class #{className} not found"
>      end

The following looks for a full pathname from the Object class. It is when
you wish to look for a class in particular, and not for all the classes of
the same name. It is when you wish only to access classes you are supposed
to have access to by name in the first place. It is also when you want
your search to take less time than a full GC phase. 


def const_get_rec(foo)
        bar = foo.split /::/
        bar.reverse!
        unf = Object
        unf = unf.const_get(bar.pop) while bar.length > 0
        unf
end

p const_get_rec("IO::File::NONBLOCK")
p IO::File::NONBLOCK





Another version (requires inject):

def const_get_rec(foo)
        foo.split(/::/).inject(Object) {|x,y| x.const_get(y) }
end





matju