| Class | BlankSlate |
| In: |
vendor/rails/activesupport/lib/active_support/vendor/builder-2.1.2/blankslate.rb
|
| Parent: | Object |
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).
# File vendor/rails/activesupport/lib/active_support/vendor/builder-2.1.2/blankslate.rb, line 31
31: def find_hidden_method(name)
32: @hidden_methods ||= {}
33: @hidden_methods[name] || superclass.find_hidden_method(name)
34: end
Hide the method named name in the BlankSlate class. Don‘t hide instance_eval or any method beginning with "__".
# File vendor/rails/activesupport/lib/active_support/vendor/builder-2.1.2/blankslate.rb, line 22
22: def hide(name)
23: if instance_methods.include?(name.to_s) and
24: name !~ /^(__|instance_eval)/
25: @hidden_methods ||= {}
26: @hidden_methods[name.to_sym] = instance_method(name)
27: undef_method name
28: end
29: end
Redefine a previously hidden method so that it may be called on a blank slate object.
# File vendor/rails/activesupport/lib/active_support/vendor/builder-2.1.2/blankslate.rb, line 38
38: def reveal(name)
39: bound_method = nil
40: unbound_method = find_hidden_method(name)
41: fail "Don't know how to reveal method '#{name}'" unless unbound_method
42: define_method(name) do |*args|
43: bound_method ||= unbound_method.bind(self)
44: bound_method.call(*args)
45: end
46: end