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require 'active_support/core_ext/kernel/singleton_class'
require 'active_support/core_ext/module/aliasing'

module ActiveSupport
  module Memoizable
    def self.memoized_ivar_for(symbol)
      "@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym
    end

    module InstanceMethods
      def self.included(base)
        base.class_eval do
          unless base.method_defined?(:freeze_without_memoizable)
            alias_method_chain :freeze, :memoizable
          end
        end
      end

      def freeze_with_memoizable
        memoize_all unless frozen?
        freeze_without_memoizable
      end

      def memoize_all
        prime_cache ".*"
      end

      def unmemoize_all
        flush_cache ".*"
      end

      def prime_cache(*syms)
        syms.each do |sym|
          methods.each do |m|
            if m.to_s =~ /^_unmemoized_(#{sym})/
              if method(m).arity == 0
                __send__($1)
              else
                ivar = ActiveSupport::Memoizable.memoized_ivar_for($1)
                instance_variable_set(ivar, {})
              end
            end
          end
        end
      end

      def flush_cache(*syms)
        syms.each do |sym|
          (methods + private_methods + protected_methods).each do |m|
            if m.to_s =~ /^_unmemoized_(#{sym.to_s.gsub(/\?\Z/, '\?')})/
              ivar = ActiveSupport::Memoizable.memoized_ivar_for($1)
              instance_variable_get(ivar).clear if instance_variable_defined?(ivar)
            end
          end
        end
      end
    end

    def memoize(*symbols)
      symbols.each do |symbol|
        original_method = :"_unmemoized_#{symbol}"
        memoized_ivar = ActiveSupport::Memoizable.memoized_ivar_for(symbol)

        class_eval <<-EOS, __FILE__, __LINE__ + 1
include InstanceMethods # include InstanceMethods
#
if method_defined?(:#{original_method}) # if method_defined?(:_unmemoized_mime_type)
raise "Already memoized #{symbol}" # raise "Already memoized mime_type"
end # end
alias #{original_method} #{symbol} # alias _unmemoized_mime_type mime_type
#
if instance_method(:#{symbol}).arity == 0 # if instance_method(:mime_type).arity == 0
def #{symbol}(reload = false) # def mime_type(reload = false)
if reload || !defined?(#{memoized_ivar}) || #{memoized_ivar}.empty? # if reload || !defined?(@_memoized_mime_type) || @_memoized_mime_type.empty?
#{memoized_ivar} = [#{original_method}] # @_memoized_mime_type = [_unmemoized_mime_type]
end # end
#{memoized_ivar}[0] # @_memoized_mime_type[0]
end # end
else # else
def #{symbol}(*args) # def mime_type(*args)
#{memoized_ivar} ||= {} unless frozen? # @_memoized_mime_type ||= {} unless frozen?
reload = args.pop if args.last == true || args.last == :reload # reload = args.pop if args.last == true || args.last == :reload
#
if defined?(#{memoized_ivar}) && #{memoized_ivar} # if defined?(@_memoized_mime_type) && @_memoized_mime_type
if !reload && #{memoized_ivar}.has_key?(args) # if !reload && @_memoized_mime_type.has_key?(args)
#{memoized_ivar}[args] # @_memoized_mime_type[args]
elsif #{memoized_ivar} # elsif @_memoized_mime_type
#{memoized_ivar}[args] = #{original_method}(*args) # @_memoized_mime_type[args] = _unmemoized_mime_type(*args)
end # end
else # else
#{original_method}(*args) # _unmemoized_mime_type(*args)
end # end
end # end
end # end
#
if private_method_defined?(#{original_method.inspect}) # if private_method_defined?(:_unmemoized_mime_type)
private #{symbol.inspect} # private :mime_type
elsif protected_method_defined?(#{original_method.inspect}) # elsif protected_method_defined?(:_unmemoized_mime_type)
protected #{symbol.inspect} # protected :mime_type
end # end
EOS
      end
    end
  end
end
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