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module ActiveSupport
module Memoizable
MEMOIZED_IVAR = Proc.new do |symbol|
"@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym
end
module Freezable
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
methods.each do |m|
if m.to_s =~ /^_unmemoized_(.*)/
if method(m).arity == 0
__send__($1)
else
ivar = MEMOIZED_IVAR.call($1)
instance_variable_set(ivar, {})
end
end
end
end
def unmemoize_all
methods.each do |m|
if m.to_s =~ /^_unmemoized_(.*)/
ivar = MEMOIZED_IVAR.call($1)
instance_variable_get(ivar).clear if instance_variable_defined?(ivar)
end
end
end
end
def memoize(*symbols)
symbols.each do |symbol|
original_method = :"_unmemoized_#{symbol}"
memoized_ivar = MEMOIZED_IVAR.call(symbol)
class_eval <<-EOS, __FILE__, __LINE__
include Freezable
raise "Already memoized #{symbol}" if method_defined?(:#{original_method})
alias #{original_method} #{symbol}
if instance_method(:#{symbol}).arity == 0
def #{symbol}(reload = false)
if reload || !defined?(#{memoized_ivar}) || #{memoized_ivar}.empty?
#{memoized_ivar} = [#{original_method}.freeze]
end
#{memoized_ivar}[0]
end
else
def #{symbol}(*args)
#{memoized_ivar} ||= {} unless frozen?
reload = args.pop if args.last == true || args.last == :reload
if defined?(#{memoized_ivar}) && #{memoized_ivar}
if !reload && #{memoized_ivar}.has_key?(args)
#{memoized_ivar}[args]
elsif #{memoized_ivar}
#{memoized_ivar}[args] = #{original_method}(*args).freeze
end
else
#{original_method}(*args)
end
end
end
EOS
end
end
end
end
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