From: Alexey Petrushin <axyd80@...>
Date: 2008-10-11T20:19:18+09:00
Subject: Re: Automatic ClassLoader (to eliminate 'require')

Thanks! It works! :)

Implementation:

  GLOBAL_BINDING = binding
  class Module
    def const_missing(const)
      full_class_name = (self == Object or self == Module) ? const.to_s 
: "#{self.name}::#{const}"
      file = full_class_name.gsub('::', '/')
      if File.directory?(file)
        eval "module #{full_class_name} end", GLOBAL_BINDING
      elsif File.exist?(file+".rb")
        script = File.read(file+".rb")
        unless self == Object or self == Module
          script = "\
  module #{self.name}
  #{script}
  end
  "
        end
        eval script, GLOBAL_BINDING
      else
        raise "Class not found: #{full_class_name}"
      end

      result = eval "#{full_class_name}", GLOBAL_BINDING
      return result if result
      raise "Class not found: #{full_class_name}"
    end
  end

  # A/B/C.rb
  #
  # class C
  # end
  #
  A::B::C.new

Notes:
- in the script for the class C, we write just C, instead of all A::B::C
- there are no really A and B modules, they are generated on the fly.
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