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).

Public Class Methods

find_hidden_method(name) click to toggle source

# File lib/blankslate.rb, line 59
def find_hidden_method(name)
  @hidden_methods ||= {}
  @hidden_methods[name] || superclass.find_hidden_method(name)
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, line 46
def hide(name)
  warn_level = $VERBOSE
  $VERBOSE = nil
  if instance_methods.include?(name._blankslate_as_name) &&
      name !~ /^(__|instance_eval|object_id$)/
    @hidden_methods ||= {}
    @hidden_methods[name.to_sym] = instance_method(name)
    undef_method name
  end
ensure
  $VERBOSE = warn_level
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, line 66
def reveal(name)
  hidden_method = find_hidden_method(name)
  fail "Don't know how to reveal method '#{name}'" unless hidden_method
  define_method(name, hidden_method)
end