Merge branch 'master' of git://github.com/rails/rails

36 files changed, 147 insertions, 182 deletions

diff --git a/actionpack/lib/abstract_controller/helpers.rb b/actionpack/lib/abstract_controller/helpers.rb
index eb621c0865..578b884a4d 100644
--- a/actionpack/lib/abstract_controller/helpers.rb
+++ b/actionpack/lib/abstract_controller/helpers.rb
@@ -1,4 +1,6 @@
 require 'active_support/dependencies'
+require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/module/delegation'
 
 module AbstractController
   module Helpers
@@ -12,10 +14,10 @@ module AbstractController
     end
 
     included do
-      extlib_inheritable_accessor(:_helpers) { Module.new }
-      extlib_inheritable_accessor(:_helper_serial) do
-        AbstractController::Helpers.next_serial
-      end
+      class_attribute :_helpers, :_helper_serial
+      delegate :_helpers, :to => :'self.class'
+      self._helpers = Module.new
+      self._helper_serial = ::AbstractController::Helpers.next_serial
     end
 
     module ClassMethods
diff --git a/actionpack/lib/abstract_controller/layouts.rb b/actionpack/lib/abstract_controller/layouts.rb
index 56ddf9bf01..0d214396aa 100644
--- a/actionpack/lib/abstract_controller/layouts.rb
+++ b/actionpack/lib/abstract_controller/layouts.rb
@@ -1,3 +1,6 @@
+require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/module/delegation'
+
 module AbstractController
   # Layouts reverse the common pattern of including shared headers and footers in many templates to isolate changes in
   # repeated setups. The inclusion pattern has pages that look like this:
@@ -161,8 +164,9 @@ module AbstractController
     include Rendering
 
     included do
-      extlib_inheritable_accessor(:_layout_conditions) { Hash.new }
-      extlib_inheritable_accessor(:_action_has_layout) { Hash.new }
+      class_attribute :_layout_conditions
+      delegate :_layout_conditions, :to => :'self.class'
+      self._layout_conditions = {}
       _write_layout_method
     end
 
diff --git a/actionpack/lib/abstract_controller/rendering.rb b/actionpack/lib/abstract_controller/rendering.rb
index ac407bda5e..619a49571b 100644
--- a/actionpack/lib/abstract_controller/rendering.rb
+++ b/actionpack/lib/abstract_controller/rendering.rb
@@ -1,4 +1,7 @@
 require "abstract_controller/base"
+require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/module/delegation'
+require 'active_support/core_ext/array/wrap'
 
 module AbstractController
   class DoubleRenderError < Error
@@ -13,8 +16,9 @@ module AbstractController
     extend ActiveSupport::Concern
 
     included do
-      extlib_inheritable_accessor :_view_paths
-      self._view_paths ||= ActionView::PathSet.new
+      class_attribute :_view_paths
+      delegate :_view_paths, :to => :'self.class'
+      self._view_paths = ActionView::PathSet.new
     end
 
     # An instance of a view class. The default view class is ActionView::Base
@@ -156,7 +160,6 @@ module AbstractController
       elsif options.key?(:file)
         options[:_template_name] = options[:file]
       end
-
       name = (options[:_template_name] || options[:action] || action_name).to_s
       options[:_prefix] ||= _prefix if (options.keys & [:partial, :file, :template]).empty?
 
@@ -201,7 +204,7 @@ module AbstractController
       # the default view path. You may also provide a custom view path
       # (see ActionView::ViewPathSet for more information)
       def append_view_path(path)
-        self.view_paths << path
+        self.view_paths = view_paths.dup + Array.wrap(path)
       end
 
       # Prepend a path to the list of view paths for this controller.
@@ -212,12 +215,12 @@ module AbstractController
       # (see ActionView::ViewPathSet for more information)
       def prepend_view_path(path)
         clear_template_caches!
-        self.view_paths.unshift(path)
+        self.view_paths = Array.wrap(path) + view_paths.dup
       end
 
       # A list of all of the default view paths for this controller.
       def view_paths
-        self._view_paths
+        _view_paths
       end
 
       # Set the view paths.
@@ -228,7 +231,8 @@ module AbstractController
       def view_paths=(paths)
         clear_template_caches!
         self._view_paths = paths.is_a?(ActionView::PathSet) ? paths : ActionView::Base.process_view_paths(paths)
+        _view_paths.freeze
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/actionpack/lib/action_controller/metal.rb b/actionpack/lib/action_controller/metal.rb
index 57627a6f0b..2b35e111ec 100644
--- a/actionpack/lib/action_controller/metal.rb
+++ b/actionpack/lib/action_controller/metal.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/class/inheritable_attributes'
+require 'active_support/core_ext/class/attribute'
 
 module ActionController
   # ActionController::Metal provides a way to get a valid Rack application from a controller.
@@ -90,7 +90,12 @@ module ActionController
       end
     end
 
-    extlib_inheritable_accessor(:middleware_stack) { ActionDispatch::MiddlewareStack.new }
+    class_attribute :middleware_stack
+    self.middleware_stack = ActionDispatch::MiddlewareStack.new
+
+    def self.inherited(base)
+      self.middleware_stack = base.middleware_stack.dup
+    end
 
     def self.use(*args)
       middleware_stack.use(*args)
diff --git a/actionpack/lib/action_controller/metal/compatibility.rb b/actionpack/lib/action_controller/metal/compatibility.rb
index 2be0fa097e..1d4a719aa6 100644
--- a/actionpack/lib/action_controller/metal/compatibility.rb
+++ b/actionpack/lib/action_controller/metal/compatibility.rb
@@ -15,9 +15,6 @@ module ActionController
       cattr_accessor :session_options
       self.session_options = {}
 
-      cattr_accessor :allow_concurrency
-      self.allow_concurrency = false
-
       cattr_accessor :relative_url_root
       self.relative_url_root = ENV['RAILS_RELATIVE_URL_ROOT']
 
@@ -44,9 +41,6 @@ module ActionController
 
       self.page_cache_directory = defined?(Rails.public_path) ? Rails.public_path : ""
 
-      cattr_accessor :consider_all_requests_local
-      self.consider_all_requests_local = true
-
       # Prepends all the URL-generating helpers from AssetHelper. This makes it possible to easily move javascripts, stylesheets,
       # and images to a dedicated asset server away from the main web server. Example:
       #   ActionController::Base.asset_host = "http://assets.example.com"
@@ -74,6 +68,25 @@ module ActionController
 
     module ClassMethods
       def consider_all_requests_local
+        ActiveSupport::Deprecation.warn "ActionController::Base.consider_all_requests_local is deprecated, " <<
+          "use Rails.application.config.consider_all_requests_local instead"
+        Rails.application.config.consider_all_requests_local
+      end
+
+      def consider_all_requests_local=(value)
+        ActiveSupport::Deprecation.warn "ActionController::Base.consider_all_requests_local= is no longer effective. " <<
+          "Please configure it on your application with config.consider_all_requests_local="
+      end
+
+      def allow_concurrency
+        ActiveSupport::Deprecation.warn "ActionController::Base.allow_concurrency is deprecated, " <<
+          "use Rails.application.config.allow_concurrency instead"
+        Rails.application.config.allow_concurrency
+      end
+
+      def allow_concurrency=(value)
+        ActiveSupport::Deprecation.warn "ActionController::Base.allow_concurrency= is no longer effective. " <<
+          "Please configure it on your application with config.allow_concurrency="
       end
 
       def rescue_action(env)
@@ -86,6 +99,9 @@ module ActionController
       end
     end
 
+    delegate :consider_all_requests_local, :consider_all_requests_local=,
+             :allow_concurrency, :allow_concurrency=, :to => :"self.class"
+
     def render_to_body(options)
       if options.is_a?(Hash) && options.key?(:template)
         options[:template].sub!(/^\//, '')
diff --git a/actionpack/lib/action_controller/metal/helpers.rb b/actionpack/lib/action_controller/metal/helpers.rb
index 05843a061b..1b5a4c3080 100644
--- a/actionpack/lib/action_controller/metal/helpers.rb
+++ b/actionpack/lib/action_controller/metal/helpers.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/attribute'
+
 module ActionController
   # The Rails framework provides a large number of helpers for working with +assets+, +dates+, +forms+,
   # +numbers+ and model objects, to name a few. These helpers are available to all templates
@@ -50,7 +52,7 @@ module ActionController
     include AbstractController::Helpers
 
     included do
-      extlib_inheritable_accessor(:helpers_path)
+      class_attribute :helpers_path
       self.helpers_path = []
     end
 
diff --git a/actionpack/lib/action_controller/metal/hide_actions.rb b/actionpack/lib/action_controller/metal/hide_actions.rb
index cdacdc40a6..e893acffdf 100644
--- a/actionpack/lib/action_controller/metal/hide_actions.rb
+++ b/actionpack/lib/action_controller/metal/hide_actions.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/attribute'
+
 module ActionController
   # ActionController::HideActions adds the ability to prevent public methods on a controller
   # to be called as actions.
@@ -5,7 +7,8 @@ module ActionController
     extend ActiveSupport::Concern
 
     included do
-      extlib_inheritable_accessor(:hidden_actions) { Set.new }
+      class_attribute :hidden_actions
+      self.hidden_actions = Set.new
     end
 
   private
@@ -14,7 +17,7 @@ module ActionController
     # action name is in the list of hidden actions.
     def action_method?(action_name)
       self.class.visible_action?(action_name) do
-        !hidden_actions.include?(action_name) && super
+        !self.class.hidden_actions.include?(action_name) && super
       end
     end
 
@@ -24,7 +27,7 @@ module ActionController
       # ==== Parameters
       # *args<#to_s>:: A list of actions
       def hide_action(*args)
-        hidden_actions.merge(args.map! {|a| a.to_s })
+        self.hidden_actions = hidden_actions.dup.merge(args.map(&:to_s))
       end
 
       def inherited(klass)
diff --git a/actionpack/lib/action_controller/metal/mime_responds.rb b/actionpack/lib/action_controller/metal/mime_responds.rb
index 08599d660e..e70a20b2be 100644
--- a/actionpack/lib/action_controller/metal/mime_responds.rb
+++ b/actionpack/lib/action_controller/metal/mime_responds.rb
@@ -1,11 +1,12 @@
 require 'abstract_controller/collector'
+require 'active_support/core_ext/class/attribute'
 
 module ActionController #:nodoc:
   module MimeResponds #:nodoc:
     extend ActiveSupport::Concern
 
     included do
-      extlib_inheritable_accessor :responder, :mimes_for_respond_to, :instance_writer => false
+      class_attribute :responder, :mimes_for_respond_to
       self.responder = ActionController::Responder
       clear_respond_to
     end
@@ -38,18 +39,20 @@ module ActionController #:nodoc:
         only_actions   = Array(options.delete(:only))
         except_actions = Array(options.delete(:except))
 
+        new = mimes_for_respond_to.dup
         mimes.each do |mime|
           mime = mime.to_sym
-          mimes_for_respond_to[mime]          = {}
-          mimes_for_respond_to[mime][:only]   = only_actions   unless only_actions.empty?
-          mimes_for_respond_to[mime][:except] = except_actions unless except_actions.empty?
+          new[mime]          = {}
+          new[mime][:only]   = only_actions   unless only_actions.empty?
+          new[mime][:except] = except_actions unless except_actions.empty?
         end
+        self.mimes_for_respond_to = new.freeze
       end
 
       # Clear all mimes in respond_to.
       #
       def clear_respond_to
-        self.mimes_for_respond_to = ActiveSupport::OrderedHash.new
+        self.mimes_for_respond_to = ActiveSupport::OrderedHash.new.freeze
       end
     end
 
@@ -218,12 +221,12 @@ module ActionController #:nodoc:
     #
     def respond_with(*resources, &block)
       raise "In order to use respond_with, first you need to declare the formats your " <<
-            "controller responds to in the class level" if mimes_for_respond_to.empty?
+            "controller responds to in the class level" if self.class.mimes_for_respond_to.empty?
 
       if response = retrieve_response_from_mimes(&block)
         options = resources.extract_options!
         options.merge!(:default_response => response)
-        (options.delete(:responder) || responder).call(self, resources, options)
+        (options.delete(:responder) || self.class.responder).call(self, resources, options)
       end
     end
 
@@ -235,8 +238,8 @@ module ActionController #:nodoc:
     def collect_mimes_from_class_level #:nodoc:
       action = action_name.to_sym
 
-      mimes_for_respond_to.keys.select do |mime|
-        config = mimes_for_respond_to[mime]
+      self.class.mimes_for_respond_to.keys.select do |mime|
+        config = self.class.mimes_for_respond_to[mime]
 
         if config[:except]
           !config[:except].include?(action)
diff --git a/actionpack/lib/action_controller/metal/renderers.rb b/actionpack/lib/action_controller/metal/renderers.rb
index c1ba47927a..639b508746 100644
--- a/actionpack/lib/action_controller/metal/renderers.rb
+++ b/actionpack/lib/action_controller/metal/renderers.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/attribute'
+
 module ActionController
   def self.add_renderer(key, &block)
     Renderers.add(key, &block)
@@ -7,8 +9,8 @@ module ActionController
     extend ActiveSupport::Concern
 
     included do
-      extlib_inheritable_accessor :_renderers
-      self._renderers = {}
+      class_attribute :_renderers
+      self._renderers = {}.freeze
     end
 
     module ClassMethods
@@ -30,9 +32,11 @@ module ActionController
       end
 
       def use_renderers(*args)
+        new = _renderers.dup
         args.each do |key|
-          _renderers[key] = RENDERERS[key]
+          new[key] = RENDERERS[key]
         end
+        self._renderers = new.freeze
         _write_render_options
       end
       alias use_renderer use_renderers
diff --git a/actionpack/lib/action_controller/metal/request_forgery_protection.rb b/actionpack/lib/action_controller/metal/request_forgery_protection.rb
index f1fb4d7ce5..276c703307 100644
--- a/actionpack/lib/action_controller/metal/request_forgery_protection.rb
+++ b/actionpack/lib/action_controller/metal/request_forgery_protection.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/attribute'
+
 module ActionController #:nodoc:
   class InvalidAuthenticityToken < ActionControllerError #:nodoc:
   end
@@ -13,7 +15,7 @@ module ActionController #:nodoc:
       cattr_accessor :request_forgery_protection_token
 
       # Controls whether request forgergy protection is turned on or not. Turned off by default only in test mode.
-      extlib_inheritable_accessor :allow_forgery_protection
+      class_attribute :allow_forgery_protection
       self.allow_forgery_protection = true
 
       helper_method :form_authenticity_token
@@ -107,7 +109,7 @@ module ActionController #:nodoc:
       end
 
       def protect_against_forgery?
-        allow_forgery_protection
+        self.class.allow_forgery_protection
       end
   end
 end
diff --git a/actionpack/lib/action_controller/metal/url_for.rb b/actionpack/lib/action_controller/metal/url_for.rb
index 387e6a554b..51702368c1 100644
--- a/actionpack/lib/action_controller/metal/url_for.rb
+++ b/actionpack/lib/action_controller/metal/url_for.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/attribute'
+
 module ActionController
   # In <b>routes.rb</b> one defines URL-to-controller mappings, but the reverse
   # is also possible: an URL can be generated from one of your routing definitions.
@@ -85,9 +87,8 @@ module ActionController
 
     included do
       ActionController::Routing::Routes.install_helpers(self)
-      extlib_inheritable_accessor :default_url_options,
-                                  :instance_writer => false, :instance_reader => false
-      self.default_url_options ||= {}
+      class_attribute :default_url_options
+      self.default_url_options = {}
     end
 
     # Overwrite to implement a number of default options that all url_for-based methods will use. The default options should come in
diff --git a/actionpack/lib/action_view.rb b/actionpack/lib/action_view.rb
index 66fc530bec..f5035fe45a 100644
--- a/actionpack/lib/action_view.rb
+++ b/actionpack/lib/action_view.rb
@@ -35,7 +35,6 @@ module ActionView
     autoload :Context
     autoload :Template
     autoload :Helpers
-    autoload :SafeBuffer
 
     autoload_under "render" do
       autoload :Partials
@@ -56,7 +55,7 @@ module ActionView
   autoload :TestCase, 'action_view/test_case'
 end
 
-require 'action_view/erb/util'
+require 'active_support/core_ext/string/output_safety'
 require 'action_view/base'
 
 I18n.load_path << "#{File.dirname(__FILE__)}/action_view/locale/en.yml"
diff --git a/actionpack/lib/action_view/base.rb b/actionpack/lib/action_view/base.rb
index 07ef3f2140..4096c296c3 100644
--- a/actionpack/lib/action_view/base.rb
+++ b/actionpack/lib/action_view/base.rb
@@ -1,5 +1,6 @@
 require 'active_support/core_ext/module/attr_internal'
 require 'active_support/core_ext/module/delegation'
+require 'active_support/core_ext/class/attribute'
 
 module ActionView #:nodoc:
   class ActionViewError < StandardError #:nodoc:
@@ -244,7 +245,7 @@ module ActionView #:nodoc:
       ActionView::PathSet.new(Array(value))
     end
 
-    extlib_inheritable_accessor :helpers
+    class_attribute :helpers
     attr_reader :helpers
 
     def self.for_controller(controller)
@@ -284,7 +285,7 @@ module ActionView #:nodoc:
       @helpers = self.class.helpers || Module.new
 
       @_controller   = controller
-      @_content_for  = Hash.new {|h,k| h[k] = ActionView::SafeBuffer.new }
+      @_content_for  = Hash.new {|h,k| h[k] = ActiveSupport::SafeBuffer.new }
       @_virtual_path = nil
       self.view_paths = view_paths
     end
diff --git a/actionpack/lib/action_view/erb/util.rb b/actionpack/lib/action_view/erb/util.rb
deleted file mode 100644
index aef859b3ac..0000000000
--- a/actionpack/lib/action_view/erb/util.rb
+++ /dev/null
@@ -1,49 +0,0 @@
-require 'erb'
-
-class ERB
-  module Util
-    HTML_ESCAPE = { '&' => '&amp;',  '>' => '&gt;',   '<' => '&lt;', '"' => '&quot;' }
-    JSON_ESCAPE = { '&' => '\u0026', '>' => '\u003E', '<' => '\u003C' }
-
-    # A utility method for escaping HTML tag characters.
-    # This method is also aliased as <tt>h</tt>.
-    #
-    # In your ERb templates, use this method to escape any unsafe content. For example:
-    #   <%=h @person.name %>
-    #
-    # ==== Example:
-    #   puts html_escape("is a > 0 & a < 10?")
-    #   # => is a &gt; 0 &amp; a &lt; 10?
-    def html_escape(s)
-      s = s.to_s
-      if s.html_safe?
-        s
-      else
-        s.gsub(/[&"><]/) { |special| HTML_ESCAPE[special] }.html_safe!
-      end
-    end
-
-    undef :h
-    alias h html_escape
-
-    module_function :html_escape
-    module_function :h
-
-    # A utility method for escaping HTML entities in JSON strings.
-    # This method is also aliased as <tt>j</tt>.
-    #
-    # In your ERb templates, use this method to escape any HTML entities:
-    #   <%=j @person.to_json %>
-    #
-    # ==== Example:
-    #   puts json_escape("is a > 0 & a < 10?")
-    #   # => is a \u003E 0 \u0026 a \u003C 10?
-    def json_escape(s)
-      s.to_s.gsub(/[&"><]/) { |special| JSON_ESCAPE[special] }
-    end
-
-    alias j json_escape
-    module_function :j
-    module_function :json_escape
-  end
-end
diff --git a/actionpack/lib/action_view/helpers/active_model_helper.rb b/actionpack/lib/action_view/helpers/active_model_helper.rb
index 87b7adf6c4..e106bb0897 100644
--- a/actionpack/lib/action_view/helpers/active_model_helper.rb
+++ b/actionpack/lib/action_view/helpers/active_model_helper.rb
@@ -6,7 +6,7 @@ require 'active_support/core_ext/kernel/reporting'
 
 module ActionView
   class Base
-    @@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>".html_safe! }
+    @@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>".html_safe }
     cattr_accessor :field_error_proc
   end
 
@@ -86,12 +86,11 @@ module ActionView
         submit_value = options[:submit_value] || options[:action].gsub(/[^\w]/, '').capitalize
 
         contents = form_tag({:action => action}, :method =>(options[:method] || 'post'), :enctype => options[:multipart] ? 'multipart/form-data': nil)
-        contents << hidden_field(record_name, :id) unless record.new_record?
-        contents << all_input_tags(record, record_name, options)
+        contents.safe_concat hidden_field(record_name, :id) unless record.new_record?
+        contents.safe_concat all_input_tags(record, record_name, options)
         yield contents if block_given?
-        contents << submit_tag(submit_value)
-        contents << '</form>'
-        contents.html_safe!
+        contents.safe_concat submit_tag(submit_value)
+        contents.safe_concat('</form>')
       end
 
       # Returns a string containing the error message attached to the +method+ on the +object+ if one exists.
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helper.rb b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
index 4df99f8293..96976ce45f 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
@@ -293,7 +293,7 @@ module ActionView
         else
           sources = expand_javascript_sources(sources, recursive)
           ensure_javascript_sources!(sources) if cache
-          sources.collect { |source| javascript_src_tag(source, options) }.join("\n").html_safe!
+          sources.collect { |source| javascript_src_tag(source, options) }.join("\n").html_safe
         end
       end
 
@@ -444,7 +444,7 @@ module ActionView
         else
           sources = expand_stylesheet_sources(sources, recursive)
           ensure_stylesheet_sources!(sources) if cache
-          sources.collect { |source| stylesheet_tag(source, options) }.join("\n").html_safe!
+          sources.collect { |source| stylesheet_tag(source, options) }.join("\n").html_safe
         end
       end
 
@@ -588,7 +588,7 @@ module ActionView
 
         if sources.is_a?(Array)
           content_tag("video", options) do
-            sources.map { |source| tag("source", :src => source) }.join.html_safe!
+            sources.map { |source| tag("source", :src => source) }.join.html_safe
           end
         else
           options[:src] = path_to_video(sources)
diff --git a/actionpack/lib/action_view/helpers/capture_helper.rb b/actionpack/lib/action_view/helpers/capture_helper.rb
index b62df75dbb..8c48300ed3 100644
--- a/actionpack/lib/action_view/helpers/capture_helper.rb
+++ b/actionpack/lib/action_view/helpers/capture_helper.rb
@@ -143,7 +143,7 @@ module ActionView
       # Defaults to a new empty string.
       def with_output_buffer(buf = nil) #:nodoc:
         unless buf
-          buf = ActionView::SafeBuffer.new
+          buf = ActiveSupport::SafeBuffer.new
           buf.force_encoding(output_buffer.encoding) if buf.respond_to?(:force_encoding)
         end
         self.output_buffer, old_buffer = buf, output_buffer
diff --git a/actionpack/lib/action_view/helpers/date_helper.rb b/actionpack/lib/action_view/helpers/date_helper.rb
index 34f38b0a8a..8be2f76bd6 100644
--- a/actionpack/lib/action_view/helpers/date_helper.rb
+++ b/actionpack/lib/action_view/helpers/date_helper.rb
@@ -616,7 +616,7 @@ module ActionView
 
           build_selects_from_types(order)
         else
-          "#{select_date}#{@options[:datetime_separator]}#{select_time}".html_safe!
+          "#{select_date}#{@options[:datetime_separator]}#{select_time}".html_safe
         end
       end
 
@@ -835,7 +835,7 @@ module ActionView
           select_html << prompt_option_tag(type, @options[:prompt]) + "\n" if @options[:prompt]
           select_html << select_options_as_html.to_s
 
-          (content_tag(:select, select_html, select_options) + "\n").html_safe!
+          (content_tag(:select, select_html, select_options) + "\n").html_safe
         end
 
         # Builds a prompt option tag with supplied options or from default options
@@ -865,7 +865,7 @@ module ActionView
             :id => input_id_from_type(type),
             :name => input_name_from_type(type),
             :value => value
-          }) + "\n").html_safe!
+          }) + "\n").html_safe
         end
 
         # Returns the name attribute for the input tag
@@ -896,7 +896,7 @@ module ActionView
             separator = separator(type) unless type == order.first # don't add on last field
             select.insert(0, separator.to_s + send("select_#{type}").to_s)
           end
-          select.html_safe!
+          select.html_safe
         end
 
         # Returns the separator for a given datetime component
@@ -916,15 +916,15 @@ module ActionView
 
     class InstanceTag #:nodoc:
       def to_date_select_tag(options = {}, html_options = {})
-        datetime_selector(options, html_options).select_date.html_safe!
+        datetime_selector(options, html_options).select_date.html_safe
       end
 
       def to_time_select_tag(options = {}, html_options = {})
-        datetime_selector(options, html_options).select_time.html_safe!
+        datetime_selector(options, html_options).select_time.html_safe
       end
 
       def to_datetime_select_tag(options = {}, html_options = {})
-        datetime_selector(options, html_options).select_datetime.html_safe!
+        datetime_selector(options, html_options).select_datetime.html_safe
       end
 
       private
diff --git a/actionpack/lib/action_view/helpers/debug_helper.rb b/actionpack/lib/action_view/helpers/debug_helper.rb
index 885945fde3..e637dc1474 100644
--- a/actionpack/lib/action_view/helpers/debug_helper.rb
+++ b/actionpack/lib/action_view/helpers/debug_helper.rb
@@ -27,10 +27,10 @@ module ActionView
       def debug(object)
         begin
           Marshal::dump(object)
-          "<pre class='debug_dump'>#{h(object.to_yaml).gsub("  ", "&nbsp; ")}</pre>".html_safe!
+          "<pre class='debug_dump'>#{h(object.to_yaml).gsub("  ", "&nbsp; ")}</pre>".html_safe
         rescue Exception => e  # errors from Marshal or YAML
           # Object couldn't be dumped, perhaps because of singleton methods -- this is the fallback
-          "<code class='debug_dump'>#{h(object.inspect)}</code>".html_safe!
+          "<code class='debug_dump'>#{h(object.inspect)}</code>".html_safe
         end
       end
     end
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index a72357cf3d..76998a6ea1 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -311,7 +311,7 @@ module ActionView
 
         concat(form_tag(options.delete(:url) || {}, options.delete(:html) || {}))
         fields_for(object_name, *(args << options), &proc)
-        concat('</form>'.html_safe!)
+        safe_concat('</form>')
       end
 
       def apply_form_for_options!(object_or_array, options) #:nodoc:
@@ -879,7 +879,7 @@ module ActionView
         end
         hidden = tag("input", "name" => options["name"], "type" => "hidden", "value" => options['disabled'] && checked ? checked_value : unchecked_value)
         checkbox = tag("input", options)
-        (hidden + checkbox).html_safe!
+        (hidden + checkbox).html_safe
       end
 
       def to_boolean_select_tag(options = {})
diff --git a/actionpack/lib/action_view/helpers/form_options_helper.rb b/actionpack/lib/action_view/helpers/form_options_helper.rb
index 02ad637509..0ffe770f5f 100644
--- a/actionpack/lib/action_view/helpers/form_options_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_options_helper.rb
@@ -296,7 +296,7 @@ module ActionView
           options << %(<option value="#{html_escape(value.to_s)}"#{selected_attribute}#{disabled_attribute}>#{html_escape(text.to_s)}</option>)
         end
 
-        options_for_select.join("\n").html_safe!
+        options_for_select.join("\n").html_safe
       end
 
       # Returns a string of option tags that have been compiled by iterating over the +collection+ and assigning the
diff --git a/actionpack/lib/action_view/helpers/form_tag_helper.rb b/actionpack/lib/action_view/helpers/form_tag_helper.rb
index 597cf311cb..9b8471c6c6 100644
--- a/actionpack/lib/action_view/helpers/form_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_tag_helper.rb
@@ -446,7 +446,7 @@ module ActionView
         concat(tag(:fieldset, options, true))
         concat(content_tag(:legend, legend)) unless legend.blank?
         concat(content)
-        concat("</fieldset>".html_safe!)
+        safe_concat("</fieldset>")
       end
 
       private
@@ -474,14 +474,14 @@ module ActionView
 
         def form_tag_html(html_options)
           extra_tags = extra_tags_for_form(html_options)
-          (tag(:form, html_options, true) + extra_tags).html_safe!
+          (tag(:form, html_options, true) + extra_tags).html_safe
         end
 
         def form_tag_in_block(html_options, &block)
           content = capture(&block)
           concat(form_tag_html(html_options))
           concat(content)
-          concat("</form>".html_safe!)
+          safe_concat("</form>")
         end
 
         def token_tag
diff --git a/actionpack/lib/action_view/helpers/number_helper.rb b/actionpack/lib/action_view/helpers/number_helper.rb
index 64b71663c3..3d3502a08b 100644
--- a/actionpack/lib/action_view/helpers/number_helper.rb
+++ b/actionpack/lib/action_view/helpers/number_helper.rb
@@ -92,7 +92,7 @@ module ActionView
             :precision => precision,
             :delimiter => delimiter,
             :separator => separator)
-          ).gsub(/%u/, unit).html_safe!
+          ).gsub(/%u/, unit).html_safe
         rescue
           number
         end
diff --git a/actionpack/lib/action_view/helpers/prototype_helper.rb b/actionpack/lib/action_view/helpers/prototype_helper.rb
index d335d89274..7eb6bceca0 100644
--- a/actionpack/lib/action_view/helpers/prototype_helper.rb
+++ b/actionpack/lib/action_view/helpers/prototype_helper.rb
@@ -610,7 +610,7 @@ module ActionView
       #     page.hide 'spinner'
       #   end
       def update_page(&block)
-        JavaScriptGenerator.new(@template, &block).to_s.html_safe!
+        JavaScriptGenerator.new(@template, &block).to_s.html_safe
       end
 
       # Works like update_page but wraps the generated JavaScript in a <script>
diff --git a/actionpack/lib/action_view/helpers/raw_output_helper.rb b/actionpack/lib/action_view/helpers/raw_output_helper.rb
index 79b0e4ee75..8c7f41177d 100644
--- a/actionpack/lib/action_view/helpers/raw_output_helper.rb
+++ b/actionpack/lib/action_view/helpers/raw_output_helper.rb
@@ -2,7 +2,7 @@ module ActionView #:nodoc:
   module Helpers #:nodoc:
     module RawOutputHelper
       def raw(stringish)
-        stringish.to_s.html_safe!
+        stringish.to_s.html_safe
       end
     end
   end
diff --git a/actionpack/lib/action_view/helpers/sanitize_helper.rb b/actionpack/lib/action_view/helpers/sanitize_helper.rb
index 657d26f0a2..28e40f8560 100644
--- a/actionpack/lib/action_view/helpers/sanitize_helper.rb
+++ b/actionpack/lib/action_view/helpers/sanitize_helper.rb
@@ -50,11 +50,7 @@ module ActionView
       # confuse browsers.
       #
       def sanitize(html, options = {})
-        returning self.class.white_list_sanitizer.sanitize(html, options) do |sanitized|
-          if sanitized
-            sanitized.html_safe!
-          end
-        end
+        self.class.white_list_sanitizer.sanitize(html, options).try(:html_safe)
       end
 
       # Sanitizes a block of CSS code. Used by +sanitize+ when it comes across a style attribute.
@@ -77,11 +73,7 @@ module ActionView
       #   strip_tags("<div id='top-bar'>Welcome to my website!</div>")
       #   # => Welcome to my website!
       def strip_tags(html)
-        returning self.class.full_sanitizer.sanitize(html) do |sanitized|
-          if sanitized
-            sanitized.html_safe!
-          end
-        end
+        self.class.full_sanitizer.sanitize(html).try(:html_safe)
       end
 
       # Strips all link tags from +text+ leaving just the link text.
diff --git a/actionpack/lib/action_view/helpers/tag_helper.rb b/actionpack/lib/action_view/helpers/tag_helper.rb
index ceddbd8cc1..ed80e07c78 100644
--- a/actionpack/lib/action_view/helpers/tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/tag_helper.rb
@@ -1,4 +1,3 @@
-require 'action_view/erb/util'
 require 'set'
 
 module ActionView
@@ -41,7 +40,7 @@ module ActionView
       #   tag("img", { :src => "open &amp; shut.png" }, false, false)
       #   # => <img src="open &amp; shut.png" />
       def tag(name, options = nil, open = false, escape = true)
-        "<#{name}#{tag_options(options, escape) if options}#{open ? ">" : " />"}".html_safe!
+        "<#{name}#{tag_options(options, escape) if options}#{open ? ">" : " />"}".html_safe
       end
 
       # Returns an HTML block tag of type +name+ surrounding the +content+. Add
@@ -94,7 +93,7 @@ module ActionView
       #   cdata_section(File.read("hello_world.txt"))
       #   # => <![CDATA[<hello from a text file]]>
       def cdata_section(content)
-        "<![CDATA[#{content}]]>".html_safe!
+        "<![CDATA[#{content}]]>".html_safe
       end
 
       # Returns an escaped version of +html+ without affecting existing escaped entities.
@@ -128,7 +127,7 @@ module ActionView
 
         def content_tag_string(name, content, options, escape = true)
           tag_options = tag_options(options, escape) if options
-          "<#{name}#{tag_options}>#{content}</#{name}>".html_safe!
+          "<#{name}#{tag_options}>#{content}</#{name}>".html_safe
         end
 
         def tag_options(options, escape = true)
@@ -143,7 +142,7 @@ module ActionView
                 attrs << %(#{key}="#{final_value}")
               end
             end
-            " #{attrs.sort * ' '}".html_safe! unless attrs.empty?
+            " #{attrs.sort * ' '}".html_safe unless attrs.empty?
           end
         end
     end
diff --git a/actionpack/lib/action_view/helpers/text_helper.rb b/actionpack/lib/action_view/helpers/text_helper.rb
index 814d86812d..412e0c82cb 100644
--- a/actionpack/lib/action_view/helpers/text_helper.rb
+++ b/actionpack/lib/action_view/helpers/text_helper.rb
@@ -24,14 +24,14 @@ module ActionView
       #       end
       #       # will either display "Logged in!" or a login link
       #   %>
-      def concat(string, unused_binding = nil)
-        if unused_binding
-          ActiveSupport::Deprecation.warn("The binding argument of #concat is no longer needed.  Please remove it from your views and helpers.", caller)
-        end
-
+      def concat(string)
         output_buffer << string
       end
 
+      def safe_concat(string)
+        output_buffer.safe_concat(string)
+      end
+
       # Truncates a given +text+ after a given <tt>:length</tt> if +text+ is longer than <tt>:length</tt>
       # (defaults to 30). The last characters will be replaced with the <tt>:omission</tt> (defaults to "...")
       # for a total length not exceeding <tt>:length</tt>.
diff --git a/actionpack/lib/action_view/helpers/translation_helper.rb b/actionpack/lib/action_view/helpers/translation_helper.rb
index ad18339c60..c348ea7a0d 100644
--- a/actionpack/lib/action_view/helpers/translation_helper.rb
+++ b/actionpack/lib/action_view/helpers/translation_helper.rb
@@ -12,7 +12,7 @@ module ActionView
       # prepend the key with a period, nothing is converted.
       def translate(key, options = {})
         options[:raise] = true
-        I18n.translate(scope_key_by_partial(key), options).html_safe!
+        I18n.translate(scope_key_by_partial(key), options).html_safe
       rescue I18n::MissingTranslationData => e
         keys = I18n.send(:normalize_translation_keys, e.locale, e.key, e.options[:scope])
         content_tag('span', keys.join(', '), :class => 'translation_missing')
diff --git a/actionpack/lib/action_view/helpers/url_helper.rb b/actionpack/lib/action_view/helpers/url_helper.rb
index 4301647a2c..168a3bdbc0 100644
--- a/actionpack/lib/action_view/helpers/url_helper.rb
+++ b/actionpack/lib/action_view/helpers/url_helper.rb
@@ -98,7 +98,7 @@ module ActionView
           polymorphic_path(options)
         end
 
-        escape ? escape_once(url).html_safe! : url
+        escape ? escape_once(url).html_safe : url
       end
 
       # Creates a link tag of the given +name+ using a URL created by the set
@@ -208,7 +208,7 @@ module ActionView
         if block_given?
           options      = args.first || {}
           html_options = args.second
-          concat(link_to(capture(&block), options, html_options).html_safe!)
+          safe_concat(link_to(capture(&block), options, html_options))
         else
           name         = args[0]
           options      = args[1] || {}
@@ -226,7 +226,7 @@ module ActionView
           end
 
           href_attr = "href=\"#{url}\"" unless href
-          "<a #{href_attr}#{tag_options}>#{ERB::Util.h(name || url)}</a>".html_safe!
+          "<a #{href_attr}#{tag_options}>#{ERB::Util.h(name || url)}</a>".html_safe
         end
       end
 
@@ -312,7 +312,7 @@ module ActionView
         html_options.merge!("type" => "submit", "value" => name)
 
         ("<form method=\"#{form_method}\" action=\"#{escape_once url}\" #{"data-remote=\"true\"" if remote} class=\"button-to\"><div>" +
-          method_tag + tag("input", html_options) + request_token_tag + "</div></form>").html_safe!
+          method_tag + tag("input", html_options) + request_token_tag + "</div></form>").html_safe
       end
 
 
diff --git a/actionpack/lib/action_view/render/partials.rb b/actionpack/lib/action_view/render/partials.rb
index 8c936ae09e..8b6dce0c1c 100644
--- a/actionpack/lib/action_view/render/partials.rb
+++ b/actionpack/lib/action_view/render/partials.rb
@@ -240,7 +240,7 @@ module ActionView
         end
 
         result = @template ? collection_with_template : collection_without_template
-        result.join(spacer).html_safe!
+        result.join(spacer).html_safe
       end
 
       def collection_with_template(template = @template)
diff --git a/actionpack/lib/action_view/safe_buffer.rb b/actionpack/lib/action_view/safe_buffer.rb
deleted file mode 100644
index 6be05b9e1e..0000000000
--- a/actionpack/lib/action_view/safe_buffer.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-module ActionView #:nodoc:
-  class SafeBuffer < String
-    def <<(value)
-      if value.html_safe?
-        super(value)
-      else
-        super(ERB::Util.h(value))
-      end
-    end
-
-    def concat(value)
-      self << value
-    end
-
-    def html_safe?
-      true
-    end
-
-    def html_safe!
-      self
-    end
-
-    def to_s
-      self
-    end
-  end
-end
\ No newline at end of file
diff --git a/actionpack/lib/action_view/template/handler.rb b/actionpack/lib/action_view/template/handler.rb
index 221d1bd5c5..8ecc911519 100644
--- a/actionpack/lib/action_view/template/handler.rb
+++ b/actionpack/lib/action_view/template/handler.rb
@@ -1,5 +1,5 @@
-require "active_support/core_ext/class/inheritable_attributes"
 require "action_dispatch/http/mime_type"
+require 'active_support/core_ext/class/attribute'
 
 # Legacy TemplateHandler stub
 module ActionView
@@ -23,7 +23,7 @@ module ActionView
     end
 
     class Template::Handler
-      extlib_inheritable_accessor :default_format
+      class_attribute :default_format
       self.default_format = Mime::HTML
 
       def self.call(template)
diff --git a/actionpack/lib/action_view/template/handlers/erb.rb b/actionpack/lib/action_view/template/handlers/erb.rb
index 93a4315108..4573a440d1 100644
--- a/actionpack/lib/action_view/template/handlers/erb.rb
+++ b/actionpack/lib/action_view/template/handlers/erb.rb
@@ -6,7 +6,7 @@ module ActionView
   module Template::Handlers
     class Erubis < ::Erubis::Eruby
       def add_preamble(src)
-        src << "@output_buffer = ActionView::SafeBuffer.new;"
+        src << "@output_buffer = ActiveSupport::SafeBuffer.new;"
       end
 
       def add_text(src, text)
@@ -15,7 +15,11 @@ module ActionView
       end
 
       def add_expr_literal(src, code)
-        src << '@output_buffer << ((' << code << ').to_s);'
+        if code =~ /\s*raw\s+(.*)/
+          src << "@output_buffer.safe_concat((" << $1 << ").to_s);"
+        else
+          src << '@output_buffer << ((' << code << ').to_s);'
+        end
       end
 
       def add_expr_escaped(src, code)
diff --git a/actionpack/lib/action_view/template/resolver.rb b/actionpack/lib/action_view/template/resolver.rb
index af5d6f6d18..6878067f7c 100644
--- a/actionpack/lib/action_view/template/resolver.rb
+++ b/actionpack/lib/action_view/template/resolver.rb
@@ -1,5 +1,6 @@
 require "pathname"
 require "active_support/core_ext/class"
+require "active_support/core_ext/array/wrap"
 require "action_view/template"
 
 module ActionView
@@ -11,7 +12,7 @@ module ActionView
 
     def self.register_detail(name, options = {})
       registered_details[name] = lambda do |val|
-        val ||= yield
+        val = Array.wrap(val || yield)
         val |= [nil] unless options[:allow_nil] == false
         val
       end
diff --git a/actionpack/lib/action_view/test_case.rb b/actionpack/lib/action_view/test_case.rb
index 3095d84e13..fc29acea6d 100644
--- a/actionpack/lib/action_view/test_case.rb
+++ b/actionpack/lib/action_view/test_case.rb
@@ -53,7 +53,7 @@ module ActionView
     setup :setup_with_controller
     def setup_with_controller
       @controller = TestController.new
-      @output_buffer = ActionView::SafeBuffer.new
+      @output_buffer = ActiveSupport::SafeBuffer.new
       @rendered = ''
 
       self.class.send(:include_helper_modules!)