Froze rails gems

[depot.git] / vendor / rails / activesupport / lib / active_support / memoizable.rb

diff --git a/vendor/rails/activesupport/lib/active_support/memoizable.rb b/vendor/rails/activesupport/lib/active_support/memoizable.rb
new file mode 100644 (file)
index 0000000..cd5c01c
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/memoizable.rb
@@ -0,0 +1,82 @@
+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