1  class Class #:nodoc:
   2    
   3    # Unassociates the class with its subclasses and removes the subclasses
   4    # themselves.
   5    #
   6    #   Integer.remove_subclasses # => [Bignum, Fixnum]
   7    #   Fixnum                    # => NameError: uninitialized constant Fixnum
   8    def remove_subclasses
   9      Object.remove_subclasses_of(self)
  10    end
  11 
  12    # Returns an array with the names of the subclasses of +self+ as strings.
  13    #
  14    #   Integer.subclasses # => ["Bignum", "Fixnum"]
  15    def subclasses
  16      Object.subclasses_of(self).map { |o| o.to_s }
  17    end
  18 
  19    # Removes the classes in +klasses+ from their parent module.
  20    #
  21    # Ordinary classes belong to some module via a constant. This method computes
  22    # that constant name from the class name and removes it from the module it
  23    # belongs to.
  24    #
  25    #   Object.remove_class(Integer) # => [Integer]
  26    #   Integer                      # => NameError: uninitialized constant Integer
  27    #
  28    # Take into account that in general the class object could be still stored
  29    # somewhere else.
  30    #
  31    #   i = Integer                  # => Integer
  32    #   Object.remove_class(Integer) # => [Integer]
  33    #   Integer                      # => NameError: uninitialized constant Integer
  34    #   i.subclasses                 # => ["Bignum", "Fixnum"]
  35    #   Fixnum.superclass            # => Integer
  36    def remove_class(*klasses)
  37      klasses.flatten.each do |klass|
  38        # Skip this class if there is nothing bound to this name
  39        next unless defined?(klass.name)
  40        
  41        basename = klass.to_s.split("::").last
  42        parent = klass.parent
  43        
  44        # Skip this class if it does not match the current one bound to this name
  45        next unless parent.const_defined?(basename) && klass = parent.const_get(basename)
  46 
  47        parent.instance_eval { remove_const basename } unless parent == klass
  48      end
  49    end
  50  end