76 lines
2.3 KiB
Ruby
76 lines
2.3 KiB
Ruby
# Facets' BasicObject is an implementation of Jim Weirich's BlankSlate.
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#
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# BlankSlate
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# Copyright 2004 by Jim Weirich (jim@weirichhouse.org).
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# All rights reserved.
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#
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# Since Ruby 1.9 has a BasicObject class this will of course be
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# deprecated as 1.9 goes mainstream.
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unless defined? BasicObject # in case it already exists!
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# BasicObject provides an abstract base class with no predefined
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# methods (except for <tt>\_\_send__</tt> and <tt>\_\_id__</tt>).
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# BlankSlate is useful as a base class when writing classes that
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# depend upon <tt>method_missing</tt> (e.g. dynamic proxies).
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class BasicObject
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class << self
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# Hide the method named +name+ in the BlankSlate class. Don't
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# hide +instance_eval+ or any method beginning with "__".
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#
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# According to 1.9.1 it should have only these methods:
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#
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# * #__send__
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# * #instance_eval
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# * #instance_exec
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# * #equal?
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# * #==
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# * #!
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# * #!=
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# * respond_to?
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#
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# Seems to me it should have #__id__ too.
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def hide(name)
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undef_method name if
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instance_methods.include?(name.to_s) and
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name !~ /^(__|respond_to\?|instance_eval$|instance_exec$|equal\?$|\=\=$)/
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end
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end
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instance_methods.each{ |m| hide(m) }
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end
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# Since Ruby is very dynamic, methods added to the ancestors of
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# BlankSlate <em>after BlankSlate is defined</em> will show up in the
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# list of available BlankSlate methods. We handle this by defining a
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# hook in the Object and Kernel classes that will hide any defined
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module Kernel #:nodoc:
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class << self
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alias_method :facets_basic_object_method_added, :method_added
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# Detect method additions to Kernel and remove them in the
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# BlankSlate class.
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def method_added(name)
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facets_basic_object_method_added(name)
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return if self != Kernel
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BasicObject.hide(name)
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end
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end
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end
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class Object #:nodoc:
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class << self
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alias_method :facets_basic_object_method_added, :method_added
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# Detect method additions to Object and remove them in the
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# BlankSlate class.
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def method_added(name)
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facets_basic_object_method_added(name)
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return if self != Object
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BasicObject.hide(name)
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end
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end
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end
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end
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