class BlankSlate

BlankSlate provides an abstract base class with no predefined methods (except for _\send_ and _\id_). BlankSlate is useful as a base class when writing classes that depend upon method_missing (e.g. dynamic proxies).

Private Class Methods

find_hidden_method(name) click to toggle source

   # File lib/blankslate.rb
60 def find_hidden_method(name)
61   @hidden_methods ||= {}
62   @hidden_methods[name] || superclass.find_hidden_method(name)
63 end

hide(name) click to toggle source

Hide the method named name in the BlankSlate class. Don’t hide instance_eval or any method beginning with “__”.

   # File lib/blankslate.rb
47 def hide(name)
48   warn_level = $VERBOSE
49   $VERBOSE = nil
50   if instance_methods.include?(name._blankslate_as_name) &&
51       name !~ /^(__|instance_eval$)/
52     @hidden_methods ||= {}
53     @hidden_methods[name.to_sym] = instance_method(name)
54     undef_method name
55   end
56 ensure
57   $VERBOSE = warn_level
58 end

reveal(name) click to toggle source

Redefine a previously hidden method so that it may be called on a blank slate object.

   # File lib/blankslate.rb
67 def reveal(name)
68   hidden_method = find_hidden_method(name)
69   fail "Don't know how to reveal method '#{name}'" unless hidden_method
70   define_method(name, hidden_method)
71 end