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/grifter/blankslate.rb, line 40
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/grifter/blankslate.rb, line 30
def hide(name)
  methods = instance_methods.map(&:to_sym)
  if methods.include?(name.to_sym) and
    name !~ /^(__|instance_eval)/
    @hidden_methods ||= {}
    @hidden_methods[name.to_sym] = instance_method(name)
    undef_method name
  end
end

new(parent) click to toggle source

# File lib/grifter/blankslate.rb, line 56
def initialize(parent)
  @parent = parent
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/grifter/blankslate.rb, line 47
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

Public Instance Methods

method_missing(method_id, *arguments, &block) click to toggle source

# File lib/grifter/blankslate.rb, line 60
def method_missing(method_id, *arguments, &block)
  @parent.send(method_id, *arguments, &block)
end