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64 lines
1.8 KiB
64 lines
1.8 KiB
#!/usr/bin/env ruby
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#--
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# Copyright 2004 by Jim Weirich (jim@weirichhouse.org).
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# All rights reserved.
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# Permission is granted for use, copying, modification, distribution,
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# and distribution of modified versions of this work as long as the
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# above copyright notice is included.
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#++
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module Hpricot
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# BlankSlate 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 BlankSlate
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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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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 !~ /^(__|instance_eval)/
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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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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
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class << self
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alias_method :hpricot_slate_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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hpricot_slate_method_added(name)
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return if self != Kernel
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Hpricot::BlankSlate.hide(name)
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end
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end
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end
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class Object
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class << self
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alias_method :hpricot_slate_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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hpricot_slate_method_added(name)
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return if self != Object
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Hpricot::BlankSlate.hide(name)
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end
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end
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end
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