From 8038f7eb10e0168a0f438d443ab69d61cb396ef5 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Wed, 8 May 2013 12:01:55 -0700
Subject: separate filters from source code

---
 activesupport/lib/active_support/callbacks.rb | 51 ++++++++++++++++-----------
 1 file changed, 31 insertions(+), 20 deletions(-)

diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 0548284186..96cf0d5654 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -92,20 +92,11 @@ module ActiveSupport
       @@_callback_sequence = 0
 
       class Basic < Callback
-        def matches?(_kind, _filter)
-          super && @filter == _filter
-        end
       end
 
       class Object < Callback
-        def matches?(_kind, _filter)
-          return false unless super
-
-          if !_filter.is_a?(String)
-            @filter.to_s.start_with?(_method_name_for_object_filter(_kind, _filter, false))
-          else
-            @filter == _filter
-          end
+        def duplicates?(other)
+          false
         end
       end
 
@@ -127,7 +118,8 @@ module ActiveSupport
         normalize_options!(options)
 
         @raw_filter, @options = filter, options
-        @filter               = _compile_filter(filter)
+        @filter = _compile_filter(filter)
+        @source = _compile_source(filter)
         recompile_options!
       end
 
@@ -161,7 +153,7 @@ module ActiveSupport
       end
 
       def matches?(_kind, _filter)
-        @kind == _kind
+        @kind == _kind && filter == _filter
       end
 
       def duplicates?(other)
@@ -191,7 +183,7 @@ module ActiveSupport
               # This double assignment is to prevent warnings in 1.9.3 as
               # the `result` variable is not always used except if the
               # terminator code refers to it.
-              result = result = #{@filter}
+              result = result = #{@source}
               halted = (#{chain.config[:terminator]})
               if halted
                 halted_callback_hook(#{@raw_filter.inspect.inspect})
@@ -203,7 +195,7 @@ module ActiveSupport
           <<-RUBY_EVAL
           #{code}
           if #{!chain.config[:skip_after_callbacks_if_terminated] || "!halted"} && #{@compiled_options}
-            #{@filter}
+            #{@source}
           end
           RUBY_EVAL
         when :around
@@ -238,7 +230,7 @@ module ActiveSupport
         @klass.class_eval <<-RUBY_EVAL,  __FILE__, __LINE__ + 1
           def #{name}(halted)
            if #{@compiled_options} && !halted
-             #{@filter} do
+             #{@source} do
                yield self
              end
            else
@@ -256,11 +248,11 @@ module ActiveSupport
         conditions = ["true"]
 
         unless options[:if].empty?
-          conditions << Array(_compile_filter(options[:if]))
+          conditions << Array(_compile_source(options[:if]))
         end
 
         unless options[:unless].empty?
-          conditions << Array(_compile_filter(options[:unless])).map {|f| "!#{f}"}
+          conditions << Array(_compile_source(options[:unless])).map {|f| "!#{f}"}
         end
 
         @compiled_options = conditions.flatten.join(" && ")
@@ -276,6 +268,25 @@ module ActiveSupport
         method_name
       end
 
+      def _compile_filter(filter)
+        case filter
+        when Array
+          filter.map {|f| _compile_filter(f)}
+        when Symbol
+          filter
+        when String
+          "(#{filter})"
+        when Proc
+          method_name = "_callback_#{@kind}_#{next_id}"
+          @klass.send(:define_method, method_name, &filter)
+          return method_name if filter.arity <= 0
+
+          method_name << (filter.arity == 1 ? "(self)" : " self, Proc.new ")
+        else
+          filter
+        end
+      end
+
       # Filters support:
       #
       #   Arrays::  Used in conditions. This is used to specify
@@ -296,10 +307,10 @@ module ActiveSupport
       #   Objects::
       #     a method is created that calls the before_foo method
       #     on the object.
-      def _compile_filter(filter)
+      def _compile_source(filter)
         case filter
         when Array
-          filter.map {|f| _compile_filter(f)}
+          filter.map {|f| _compile_source(f)}
         when Symbol
           filter
         when String
-- 
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