2008-07-14 20:50:32 -04:00
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module ActiveSupport
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module Memoizable
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def self.included(base) #:nodoc:
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base.extend(ClassMethods)
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end
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module ClassMethods
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2008-07-14 21:02:59 -04:00
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def memoize(symbol)
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original_method = "_unmemoized_#{symbol}"
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2008-07-14 20:50:32 -04:00
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alias_method original_method, symbol
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class_eval <<-EOS, __FILE__, __LINE__
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def #{symbol}
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if instance_variable_defined?(:@#{symbol})
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@#{symbol}
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else
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@#{symbol} = #{original_method}
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end
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end
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EOS
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end
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end
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def freeze
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methods.each do |method|
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2008-07-14 21:02:59 -04:00
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if m = method.to_s.match(/^_unmemoized_(.*)/)
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2008-07-14 20:50:32 -04:00
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send(m[1]).freeze
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end
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end
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super
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end
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end
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end
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