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if RUBY_VERSION >= '1.9'
module AE
BasicObject = ::BasicObject
end
else
module AE
# BasicObject provides an abstract base class with no predefined
# methods (except for <tt>\_\_send__</tt> and <tt>\_\_id__</tt>).
# BasicObject is useful as a base class when writing classes that
# depend upon <tt>method_missing</tt> (e.g. dynamic proxies).
#
# BasicObject is based on BlankSlate by Jim Weirich.
#
# Copyright 2004, 2006 by Jim Weirich (jim@weirichhouse.org).
# All rights reserved.
class BasicObject #:nodoc:
# Hide the method named +name+ in the BlankSlate class. Don't
# hide +instance_eval+ or any method beginning with "__".
def self.hide(name)
name = name.to_s
if instance_methods.include?(name) and
name !~ /^(__|instance_eval|instance_exec)/
@hidden_methods ||= {}
@hidden_methods[name.to_sym] = instance_method(name)
undef_method name
end
end
def self.find_hidden_method(name)
@hidden_methods ||= {}
@hidden_methods[name.to_sym] || superclass.find_hidden_method(name)
end
# Redefine a previously hidden method so that it may be called on a blank
# slate object.
def self.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
#
instance_methods.each { |m| hide(m) }
end
end
# Since Ruby is very dynamic, methods added to the ancestors of
# BlankSlate <em>after BlankSlate is defined</em> will show up in the
# list of available BlankSlate methods. We handle this by defining a
# hook in the Object and Kernel classes that will hide any method
# defined after BlankSlate has been loaded.
#
module Kernel
class << self
alias_method :basic_object_method_added, :method_added
# Detect method additions to Kernel and remove them in the
# BasicObject class.
def method_added(name)
result = basic_object_method_added(name)
return result if self != Kernel
AE::BasicObject.hide(name)
result
end
end
end
# Same as above, except in Object.
#
class Object
class << self
alias_method :basic_object_method_added, :method_added
# Detect method additions to Object and remove them in the
# BlankSlate class.
def method_added(name)
result = basic_object_method_added(name)
return result if self != Object
AE::BasicObject.hide(name)
result
end
def find_hidden_method(name)
nil
end
end
end
# Also, modules included into Object need to be scanned and have their
# instance methods removed from blank slate. In theory, modules
# included into Kernel would have to be removed as well, but a
# "feature" of Ruby prevents late includes into modules from being
# exposed in the first place.
#
class Module #:nodoc:
alias basic_object_original_append_features append_features
def append_features(mod)
result = basic_object_original_append_features(mod)
return result if mod != Object
instance_methods.each do |name|
AE::BasicObject.hide(name)
end
result
end
end
end
|
