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######################################################################
# Jsonify::BlankSlate is based on Jim Weirich's BlankSlate.
#
# Copyright 2004, 2006 by Jim Weirich (jim@weirichhouse.org).
# All rights reserved.
#
# 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).
#
# This Jsonify implementation of BlankSlate is identical; with the
# exception that it does not include the Kernel, Module, and Object
# patches.
#
module Jsonify
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)
if instance_methods.include?(name.to_s) and
name !~ /^(__|instance_eval)/
@hidden_methods ||= {}
@hidden_methods[name.to_sym] = instance_method(name)
undef_method name
end
end
def find_hidden_method(name)
@hidden_methods ||= {}
@hidden_methods[name] || superclass.find_hidden_method(name)
end
# Redefine a previously hidden method so that it may be called on a blank
# slate object.
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
end
instance_methods.each { |m| hide(m) }
end
end
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