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#!/usr/bin/env ruby
#--
# Copyright 2004 by Jim Weirich (jim@weirichhouse.org).
# All rights reserved.
# Permission is granted for use, copying, modification, distribution,
# and distribution of modified versions of this work as long as the
# above copyright notice is included.
#++
module Builder #:nodoc:
# BlankSlate provides an abstract base class with no predefined
# methods (except for <tt>\_\_send__</tt> and <tt>\_\_id__</tt>).
# BlankSlate is useful as a base class when writing classes that
# depend upon <tt>method_missing</tt> (e.g. dynamic proxies).
class BlankSlate
class << self
# Hide the method named +name+ in the BlankSlate class. Don't
# hide +instance_eval+ or any method beginning with "__".
def hide(name)
undef_method name if
instance_methods.include?(name.to_s) and
name !~ /^(__|instance_eval)/
end
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 defined
module Kernel #:nodoc:
class << self
alias_method :blank_slate_method_added, :method_added
# Detect method additions to Kernel and remove them in the
# BlankSlate class.
def method_added(name)
blank_slate_method_added(name)
return if self != Kernel
Builder::BlankSlate.hide(name)
end
end
end
class Object #:nodoc:
class << self
alias_method :blank_slate_method_added, :method_added
# Detect method additions to Object and remove them in the
# BlankSlate class.
def method_added(name)
blank_slate_method_added(name)
return if self != Object
Builder::BlankSlate.hide(name)
end
end
end
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