split the javascript and stylesheet tag helpers into separate files as a precusor before removing the duplication between the two

3 files changed, 348 insertions, 313 deletions

diff --git a/actionpack/lib/action_view/helpers/asset_tag_helper.rb b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
index db5f5f301a..858fff2882 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
@@ -2,6 +2,8 @@ require 'thread'
 require 'cgi'
 require 'action_view/helpers/url_helper'
 require 'action_view/helpers/tag_helper'
+require 'action_view/helpers/asset_tag_helpers/javascript_tag_helpers'
+require 'action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers'
 require 'active_support/core_ext/file'
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/string/output_safety'
@@ -195,11 +197,8 @@ module ActionView
     #   RewriteEngine On
     #   RewriteRule ^/release-\d+/(images|javascripts|stylesheets)/(.*)$ /$1/$2 [L]
     module AssetTagHelper
-      mattr_reader :javascript_expansions
-      @@javascript_expansions = { }
-
-      mattr_reader :stylesheet_expansions
-      @@stylesheet_expansions = {}
+      include JavascriptTagHelpers
+      include StylesheetTagHelpers
 
       # You can enable or disable the asset tag timestamps cache.
       # With the cache enabled, the asset tag helper methods will make fewer
@@ -242,260 +241,6 @@ module ActionView
         )
       end
 
-      # Computes the path to a javascript asset in the public javascripts directory.
-      # If the +source+ filename has no extension, .js will be appended (except for explicit URIs)
-      # Full paths from the document root will be passed through.
-      # Used internally by javascript_include_tag to build the script path.
-      #
-      # ==== Examples
-      #   javascript_path "xmlhr" # => /javascripts/xmlhr.js
-      #   javascript_path "dir/xmlhr.js" # => /javascripts/dir/xmlhr.js
-      #   javascript_path "/dir/xmlhr" # => /dir/xmlhr.js
-      #   javascript_path "http://www.railsapplication.com/js/xmlhr" # => http://www.railsapplication.com/js/xmlhr
-      #   javascript_path "http://www.railsapplication.com/js/xmlhr.js" # => http://www.railsapplication.com/js/xmlhr.js
-      def javascript_path(source)
-        compute_public_path(source, 'javascripts', 'js')
-      end
-      alias_method :path_to_javascript, :javascript_path # aliased to avoid conflicts with a javascript_path named route
-
-      # Returns an HTML script tag for each of the +sources+ provided. You
-      # can pass in the filename (.js extension is optional) of JavaScript files
-      # that exist in your <tt>public/javascripts</tt> directory for inclusion into the
-      # current page or you can pass the full path relative to your document
-      # root. To include the Prototype and Scriptaculous JavaScript libraries in
-      # your application, pass <tt>:defaults</tt> as the source. When using
-      # <tt>:defaults</tt>, if an <tt>application.js</tt> file exists in
-      # <tt>public/javascripts</tt> it will be included as well. You can modify the
-      # HTML attributes of the script tag by passing a hash as the last argument.
-      #
-      # ==== Examples
-      #   javascript_include_tag "xmlhr" # =>
-      #     <script type="text/javascript" src="/javascripts/xmlhr.js?1284139606"></script>
-      #
-      #   javascript_include_tag "xmlhr.js" # =>
-      #     <script type="text/javascript" src="/javascripts/xmlhr.js?1284139606"></script>
-      #
-      #   javascript_include_tag "common.javascript", "/elsewhere/cools" # =>
-      #     <script type="text/javascript" src="/javascripts/common.javascript?1284139606"></script>
-      #     <script type="text/javascript" src="/elsewhere/cools.js?1423139606"></script>
-      #
-      #   javascript_include_tag "http://www.railsapplication.com/xmlhr" # =>
-      #     <script type="text/javascript" src="http://www.railsapplication.com/xmlhr.js?1284139606"></script>
-      #
-      #   javascript_include_tag "http://www.railsapplication.com/xmlhr.js" # =>
-      #     <script type="text/javascript" src="http://www.railsapplication.com/xmlhr.js?1284139606"></script>
-      #
-      #   javascript_include_tag :defaults # =>
-      #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/effects.js?1284139606"></script>
-      #     ...
-      #     <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
-      #
-      # * = The application.js file is only referenced if it exists
-      #
-      # You can also include all javascripts in the +javascripts+ directory using <tt>:all</tt> as the source:
-      #
-      #   javascript_include_tag :all # =>
-      #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/effects.js?1284139606"></script>
-      #     ...
-      #     <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/shop.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/checkout.js?1284139606"></script>
-      #
-      # Note that the default javascript files will be included first. So Prototype and Scriptaculous are available to
-      # all subsequently included files.
-      #
-      # If you want Rails to search in all the subdirectories under javascripts, you should explicitly set <tt>:recursive</tt>:
-      #
-      #   javascript_include_tag :all, :recursive => true
-      #
-      # == Caching multiple javascripts into one
-      #
-      # You can also cache multiple javascripts into one file, which requires less HTTP connections to download and can better be
-      # compressed by gzip (leading to faster transfers). Caching will only happen if config.perform_caching
-      # is set to <tt>true</tt> (which is the case by default for the Rails production environment, but not for the development
-      # environment).
-      #
-      # ==== Examples
-      #   javascript_include_tag :all, :cache => true # when config.perform_caching is false =>
-      #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/effects.js?1284139606"></script>
-      #     ...
-      #     <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/shop.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/checkout.js?1284139606"></script>
-      #
-      #   javascript_include_tag :all, :cache => true # when config.perform_caching is true =>
-      #     <script type="text/javascript" src="/javascripts/all.js?1344139789"></script>
-      #
-      #   javascript_include_tag "prototype", "cart", "checkout", :cache => "shop" # when config.perform_caching is false =>
-      #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
-      #     <script type="text/javascript" src="/javascripts/cart.js?1289139157"></script>
-      #     <script type="text/javascript" src="/javascripts/checkout.js?1299139816"></script>
-      #
-      #   javascript_include_tag "prototype", "cart", "checkout", :cache => "shop" # when config.perform_caching is true =>
-      #     <script type="text/javascript" src="/javascripts/shop.js?1299139816"></script>
-      #
-      # The <tt>:recursive</tt> option is also available for caching:
-      #
-      #   javascript_include_tag :all, :cache => true, :recursive => true
-      def javascript_include_tag(*sources)
-        options = sources.extract_options!.stringify_keys
-        concat  = options.delete("concat")
-        cache   = concat || options.delete("cache")
-        recursive = options.delete("recursive")
-
-        if concat || (config.perform_caching && cache)
-          joined_javascript_name = (cache == true ? "all" : cache) + ".js"
-          joined_javascript_path = File.join(joined_javascript_name[/^#{File::SEPARATOR}/] ? config.assets_dir : config.javascripts_dir, joined_javascript_name)
-
-          unless config.perform_caching && File.exists?(joined_javascript_path)
-            write_asset_file_contents(joined_javascript_path, compute_javascript_paths(sources, recursive))
-          end
-          javascript_src_tag(joined_javascript_name, options)
-        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
-        end
-      end
-
-      # Register one or more javascript files to be included when <tt>symbol</tt>
-      # is passed to <tt>javascript_include_tag</tt>. This method is typically intended
-      # to be called from plugin initialization to register javascript files
-      # that the plugin installed in <tt>public/javascripts</tt>.
-      #
-      #   ActionView::Helpers::AssetTagHelper.register_javascript_expansion :monkey => ["head", "body", "tail"]
-      #
-      #   javascript_include_tag :monkey # =>
-      #     <script type="text/javascript" src="/javascripts/head.js"></script>
-      #     <script type="text/javascript" src="/javascripts/body.js"></script>
-      #     <script type="text/javascript" src="/javascripts/tail.js"></script>
-      def self.register_javascript_expansion(expansions)
-        @@javascript_expansions.merge!(expansions)
-      end
-
-      # Register one or more stylesheet files to be included when <tt>symbol</tt>
-      # is passed to <tt>stylesheet_link_tag</tt>. This method is typically intended
-      # to be called from plugin initialization to register stylesheet files
-      # that the plugin installed in <tt>public/stylesheets</tt>.
-      #
-      #   ActionView::Helpers::AssetTagHelper.register_stylesheet_expansion :monkey => ["head", "body", "tail"]
-      #
-      #   stylesheet_link_tag :monkey # =>
-      #     <link href="/stylesheets/head.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/body.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/tail.css"  media="screen" rel="stylesheet" type="text/css" />
-      def self.register_stylesheet_expansion(expansions)
-        @@stylesheet_expansions.merge!(expansions)
-      end
-
-      # Computes the path to a stylesheet asset in the public stylesheets directory.
-      # If the +source+ filename has no extension, <tt>.css</tt> will be appended (except for explicit URIs).
-      # Full paths from the document root will be passed through.
-      # Used internally by +stylesheet_link_tag+ to build the stylesheet path.
-      #
-      # ==== Examples
-      #   stylesheet_path "style" # => /stylesheets/style.css
-      #   stylesheet_path "dir/style.css" # => /stylesheets/dir/style.css
-      #   stylesheet_path "/dir/style.css" # => /dir/style.css
-      #   stylesheet_path "http://www.railsapplication.com/css/style" # => http://www.railsapplication.com/css/style
-      #   stylesheet_path "http://www.railsapplication.com/css/style.css" # => http://www.railsapplication.com/css/style.css
-      def stylesheet_path(source)
-        compute_public_path(source, 'stylesheets', 'css')
-      end
-      alias_method :path_to_stylesheet, :stylesheet_path # aliased to avoid conflicts with a stylesheet_path named route
-
-      # Returns a stylesheet link tag for the sources specified as arguments. If
-      # you don't specify an extension, <tt>.css</tt> will be appended automatically.
-      # You can modify the link attributes by passing a hash as the last argument.
-      #
-      # ==== Examples
-      #   stylesheet_link_tag "style" # =>
-      #     <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "style.css" # =>
-      #     <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "http://www.railsapplication.com/style.css" # =>
-      #     <link href="http://www.railsapplication.com/style.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "style", :media => "all" # =>
-      #     <link href="/stylesheets/style.css" media="all" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "style", :media => "print" # =>
-      #     <link href="/stylesheets/style.css" media="print" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "random.styles", "/css/stylish" # =>
-      #     <link href="/stylesheets/random.styles" media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/css/stylish.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      # You can also include all styles in the stylesheets directory using <tt>:all</tt> as the source:
-      #
-      #   stylesheet_link_tag :all # =>
-      #     <link href="/stylesheets/style1.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/styleB.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/styleX2.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      # If you want Rails to search in all the subdirectories under stylesheets, you should explicitly set <tt>:recursive</tt>:
-      #
-      #   stylesheet_link_tag :all, :recursive => true
-      #
-      # == Caching multiple stylesheets into one
-      #
-      # You can also cache multiple stylesheets into one file, which requires less HTTP connections and can better be
-      # compressed by gzip (leading to faster transfers). Caching will only happen if config.perform_caching
-      # is set to true (which is the case by default for the Rails production environment, but not for the development
-      # environment). Examples:
-      #
-      # ==== Examples
-      #   stylesheet_link_tag :all, :cache => true # when config.perform_caching is false =>
-      #     <link href="/stylesheets/style1.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/styleB.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/styleX2.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag :all, :cache => true # when config.perform_caching is true =>
-      #     <link href="/stylesheets/all.css"  media="screen" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "shop", "cart", "checkout", :cache => "payment" # when config.perform_caching is false =>
-      #     <link href="/stylesheets/shop.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/cart.css"  media="screen" rel="stylesheet" type="text/css" />
-      #     <link href="/stylesheets/checkout.css" media="screen" rel="stylesheet" type="text/css" />
-      #
-      #   stylesheet_link_tag "shop", "cart", "checkout", :cache => "payment" # when config.perform_caching is true =>
-      #     <link href="/stylesheets/payment.css"  media="screen" rel="stylesheet" type="text/css" />
-      #
-      # The <tt>:recursive</tt> option is also available for caching:
-      #
-      #   stylesheet_link_tag :all, :cache => true, :recursive => true
-      #
-      # To force concatenation (even in development mode) set <tt>:concat</tt> to true. This is useful if
-      # you have too many stylesheets for IE to load.
-      #
-      #   stylesheet_link_tag :all, :concat => true
-      #
-      def stylesheet_link_tag(*sources)
-        options = sources.extract_options!.stringify_keys
-        concat  = options.delete("concat")
-        cache   = concat || options.delete("cache")
-        recursive = options.delete("recursive")
-
-        if concat || (config.perform_caching && cache)
-          joined_stylesheet_name = (cache == true ? "all" : cache) + ".css"
-          joined_stylesheet_path = File.join(joined_stylesheet_name[/^#{File::SEPARATOR}/] ? config.assets_dir : config.stylesheets_dir, joined_stylesheet_name)
-
-          unless config.perform_caching && File.exists?(joined_stylesheet_path)
-            write_asset_file_contents(joined_stylesheet_path, compute_stylesheet_paths(sources, recursive))
-          end
-          stylesheet_tag(joined_stylesheet_name, options)
-        else
-          sources = expand_stylesheet_sources(sources, recursive)
-          ensure_stylesheet_sources!(sources) if cache
-          sources.collect { |source| stylesheet_tag(source, options) }.join("\n").html_safe
-        end
-      end
-
       # Web browsers cache favicons. If you just throw a <tt>favicon.ico</tt> into the document
       # root of your application and it changes later, clients that have it in their cache
       # won't see the update. Using this helper prevents that because it appends an asset ID:
@@ -815,45 +560,6 @@ module ActionView
           end
         end
 
-        def javascript_src_tag(source, options)
-          content_tag("script", "", { "type" => Mime::JS, "src" => path_to_javascript(source) }.merge(options))
-        end
-
-        def stylesheet_tag(source, options)
-          tag("link", { "rel" => "stylesheet", "type" => Mime::CSS, "media" => "screen", "href" => ERB::Util.html_escape(path_to_stylesheet(source)) }.merge(options), false, false)
-        end
-
-        def compute_javascript_paths(*args)
-          expand_javascript_sources(*args).collect { |source| compute_public_path(source, 'javascripts', 'js', false) }
-        end
-
-        def compute_stylesheet_paths(*args)
-          expand_stylesheet_sources(*args).collect { |source| compute_public_path(source, 'stylesheets', 'css', false) }
-        end
-
-        def expand_javascript_sources(sources, recursive = false)
-          if sources.include?(:all)
-            all_javascript_files = (collect_asset_files(config.javascripts_dir, ('**' if recursive), '*.js') - ['application']) << 'application'
-            ((determine_source(:defaults, @@javascript_expansions).dup & all_javascript_files) + all_javascript_files).uniq
-          else
-            expanded_sources = sources.collect do |source|
-              determine_source(source, @@javascript_expansions)
-            end.flatten
-            expanded_sources << "application" if sources.include?(:defaults) && File.exist?(File.join(config.javascripts_dir, "application.js"))
-            expanded_sources
-          end
-        end
-
-        def expand_stylesheet_sources(sources, recursive)
-          if sources.first == :all
-            collect_asset_files(config.stylesheets_dir, ('**' if recursive), '*.css')
-          else
-            sources.collect do |source|
-              determine_source(source, @@stylesheet_expansions)
-            end.flatten
-          end
-        end
-
         def determine_source(source, collection)
           case source
           when Symbol
@@ -863,26 +569,11 @@ module ActionView
           end
         end
 
-        def ensure_stylesheet_sources!(sources)
-          sources.each do |source|
-            asset_file_path!(path_to_stylesheet(source))
-          end
-          return sources
-        end
-
-        def ensure_javascript_sources!(sources)
-          sources.each do |source|
-            asset_file_path!(path_to_javascript(source))
-          end
-          return sources
-        end
-
         def join_asset_file_contents(paths)
           paths.collect { |path| File.read(asset_file_path!(path, true)) }.join("\n\n")
         end
 
         def write_asset_file_contents(joined_asset_path, asset_paths)
-
           FileUtils.mkdir_p(File.dirname(joined_asset_path))
           File.atomic_write(joined_asset_path) { |cache| cache.write(join_asset_file_contents(asset_paths)) }
 
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb b/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb
new file mode 100644
index 0000000000..ea8ac3f9a1
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb
@@ -0,0 +1,180 @@
+module ActionView
+  module Helpers
+    module AssetTagHelper
+      module JavascriptTagHelpers
+        extend ActiveSupport::Concern
+
+        included do
+          mattr_accessor :javascript_expansions
+          self.javascript_expansions = { }
+        end
+
+        module ClassMethods
+          # Register one or more javascript files to be included when <tt>symbol</tt>
+          # is passed to <tt>javascript_include_tag</tt>. This method is typically intended
+          # to be called from plugin initialization to register javascript files
+          # that the plugin installed in <tt>public/javascripts</tt>.
+          #
+          #   ActionView::Helpers::AssetTagHelper.register_javascript_expansion :monkey => ["head", "body", "tail"]
+          #
+          #   javascript_include_tag :monkey # =>
+          #     <script type="text/javascript" src="/javascripts/head.js"></script>
+          #     <script type="text/javascript" src="/javascripts/body.js"></script>
+          #     <script type="text/javascript" src="/javascripts/tail.js"></script>
+          def register_javascript_expansion(expansions)
+            self.javascript_expansions.merge!(expansions)
+          end
+        end
+
+        # Computes the path to a javascript asset in the public javascripts directory.
+        # If the +source+ filename has no extension, .js will be appended (except for explicit URIs)
+        # Full paths from the document root will be passed through.
+        # Used internally by javascript_include_tag to build the script path.
+        #
+        # ==== Examples
+        #   javascript_path "xmlhr" # => /javascripts/xmlhr.js
+        #   javascript_path "dir/xmlhr.js" # => /javascripts/dir/xmlhr.js
+        #   javascript_path "/dir/xmlhr" # => /dir/xmlhr.js
+        #   javascript_path "http://www.railsapplication.com/js/xmlhr" # => http://www.railsapplication.com/js/xmlhr
+        #   javascript_path "http://www.railsapplication.com/js/xmlhr.js" # => http://www.railsapplication.com/js/xmlhr.js
+        def javascript_path(source)
+          compute_public_path(source, 'javascripts', 'js')
+        end
+        alias_method :path_to_javascript, :javascript_path # aliased to avoid conflicts with a javascript_path named route
+
+        # Returns an HTML script tag for each of the +sources+ provided. You
+        # can pass in the filename (.js extension is optional) of JavaScript files
+        # that exist in your <tt>public/javascripts</tt> directory for inclusion into the
+        # current page or you can pass the full path relative to your document
+        # root. To include the Prototype and Scriptaculous JavaScript libraries in
+        # your application, pass <tt>:defaults</tt> as the source. When using
+        # <tt>:defaults</tt>, if an <tt>application.js</tt> file exists in
+        # <tt>public/javascripts</tt> it will be included as well. You can modify the
+        # HTML attributes of the script tag by passing a hash as the last argument.
+        #
+        # ==== Examples
+        #   javascript_include_tag "xmlhr" # =>
+        #     <script type="text/javascript" src="/javascripts/xmlhr.js?1284139606"></script>
+        #
+        #   javascript_include_tag "xmlhr.js" # =>
+        #     <script type="text/javascript" src="/javascripts/xmlhr.js?1284139606"></script>
+        #
+        #   javascript_include_tag "common.javascript", "/elsewhere/cools" # =>
+        #     <script type="text/javascript" src="/javascripts/common.javascript?1284139606"></script>
+        #     <script type="text/javascript" src="/elsewhere/cools.js?1423139606"></script>
+        #
+        #   javascript_include_tag "http://www.railsapplication.com/xmlhr" # =>
+        #     <script type="text/javascript" src="http://www.railsapplication.com/xmlhr.js?1284139606"></script>
+        #
+        #   javascript_include_tag "http://www.railsapplication.com/xmlhr.js" # =>
+        #     <script type="text/javascript" src="http://www.railsapplication.com/xmlhr.js?1284139606"></script>
+        #
+        #   javascript_include_tag :defaults # =>
+        #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/effects.js?1284139606"></script>
+        #     ...
+        #     <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
+        #
+        # * = The application.js file is only referenced if it exists
+        #
+        # You can also include all javascripts in the +javascripts+ directory using <tt>:all</tt> as the source:
+        #
+        #   javascript_include_tag :all # =>
+        #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/effects.js?1284139606"></script>
+        #     ...
+        #     <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/shop.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/checkout.js?1284139606"></script>
+        #
+        # Note that the default javascript files will be included first. So Prototype and Scriptaculous are available to
+        # all subsequently included files.
+        #
+        # If you want Rails to search in all the subdirectories under javascripts, you should explicitly set <tt>:recursive</tt>:
+        #
+        #   javascript_include_tag :all, :recursive => true
+        #
+        # == Caching multiple javascripts into one
+        #
+        # You can also cache multiple javascripts into one file, which requires less HTTP connections to download and can better be
+        # compressed by gzip (leading to faster transfers). Caching will only happen if config.perform_caching
+        # is set to <tt>true</tt> (which is the case by default for the Rails production environment, but not for the development
+        # environment).
+        #
+        # ==== Examples
+        #   javascript_include_tag :all, :cache => true # when config.perform_caching is false =>
+        #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/effects.js?1284139606"></script>
+        #     ...
+        #     <script type="text/javascript" src="/javascripts/application.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/shop.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/checkout.js?1284139606"></script>
+        #
+        #   javascript_include_tag :all, :cache => true # when config.perform_caching is true =>
+        #     <script type="text/javascript" src="/javascripts/all.js?1344139789"></script>
+        #
+        #   javascript_include_tag "prototype", "cart", "checkout", :cache => "shop" # when config.perform_caching is false =>
+        #     <script type="text/javascript" src="/javascripts/prototype.js?1284139606"></script>
+        #     <script type="text/javascript" src="/javascripts/cart.js?1289139157"></script>
+        #     <script type="text/javascript" src="/javascripts/checkout.js?1299139816"></script>
+        #
+        #   javascript_include_tag "prototype", "cart", "checkout", :cache => "shop" # when config.perform_caching is true =>
+        #     <script type="text/javascript" src="/javascripts/shop.js?1299139816"></script>
+        #
+        # The <tt>:recursive</tt> option is also available for caching:
+        #
+        #   javascript_include_tag :all, :cache => true, :recursive => true
+        def javascript_include_tag(*sources)
+          options = sources.extract_options!.stringify_keys
+          concat  = options.delete("concat")
+          cache   = concat || options.delete("cache")
+          recursive = options.delete("recursive")
+
+          if concat || (config.perform_caching && cache)
+            joined_javascript_name = (cache == true ? "all" : cache) + ".js"
+            joined_javascript_path = File.join(joined_javascript_name[/^#{File::SEPARATOR}/] ? config.assets_dir : config.javascripts_dir, joined_javascript_name)
+
+            unless config.perform_caching && File.exists?(joined_javascript_path)
+              write_asset_file_contents(joined_javascript_path, compute_javascript_paths(sources, recursive))
+            end
+            javascript_src_tag(joined_javascript_name, options)
+          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
+          end
+        end
+
+        private
+
+          def javascript_src_tag(source, options)
+            content_tag("script", "", { "type" => Mime::JS, "src" => path_to_javascript(source) }.merge(options))
+          end
+
+          def compute_javascript_paths(*args)
+            expand_javascript_sources(*args).collect { |source| compute_public_path(source, 'javascripts', 'js', false) }
+          end
+
+          def expand_javascript_sources(sources, recursive = false)
+            if sources.include?(:all)
+              all_javascript_files = (collect_asset_files(config.javascripts_dir, ('**' if recursive), '*.js') - ['application']) << 'application'
+              ((determine_source(:defaults, self.javascript_expansions).dup & all_javascript_files) + all_javascript_files).uniq
+            else
+              expanded_sources = sources.collect do |source|
+                determine_source(source, self.javascript_expansions)
+              end.flatten
+              expanded_sources << "application" if sources.include?(:defaults) && File.exist?(File.join(config.javascripts_dir, "application.js"))
+              expanded_sources
+            end
+          end
+
+          def ensure_javascript_sources!(sources)
+            sources.each do |source|
+              asset_file_path!(path_to_javascript(source))
+            end
+            return sources
+          end
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb b/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb
new file mode 100644
index 0000000000..6ae4792b70
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb
@@ -0,0 +1,164 @@
+module ActionView
+  module Helpers
+    module AssetTagHelper
+      module StylesheetTagHelpers
+        extend ActiveSupport::Concern
+
+        included do
+          mattr_accessor :stylesheet_expansions
+          self.stylesheet_expansions = { }
+        end
+
+        module ClassMethods
+          # Register one or more stylesheet files to be included when <tt>symbol</tt>
+          # is passed to <tt>stylesheet_link_tag</tt>. This method is typically intended
+          # to be called from plugin initialization to register stylesheet files
+          # that the plugin installed in <tt>public/stylesheets</tt>.
+          #
+          #   ActionView::Helpers::AssetTagHelper.register_stylesheet_expansion :monkey => ["head", "body", "tail"]
+          #
+          #   stylesheet_link_tag :monkey # =>
+          #     <link href="/stylesheets/head.css"  media="screen" rel="stylesheet" type="text/css" />
+          #     <link href="/stylesheets/body.css"  media="screen" rel="stylesheet" type="text/css" />
+          #     <link href="/stylesheets/tail.css"  media="screen" rel="stylesheet" type="text/css" />
+          def register_stylesheet_expansion(expansions)
+            self.stylesheet_expansions.merge!(expansions)
+          end
+        end
+
+        # Computes the path to a stylesheet asset in the public stylesheets directory.
+        # If the +source+ filename has no extension, <tt>.css</tt> will be appended (except for explicit URIs).
+        # Full paths from the document root will be passed through.
+        # Used internally by +stylesheet_link_tag+ to build the stylesheet path.
+        #
+        # ==== Examples
+        #   stylesheet_path "style" # => /stylesheets/style.css
+        #   stylesheet_path "dir/style.css" # => /stylesheets/dir/style.css
+        #   stylesheet_path "/dir/style.css" # => /dir/style.css
+        #   stylesheet_path "http://www.railsapplication.com/css/style" # => http://www.railsapplication.com/css/style
+        #   stylesheet_path "http://www.railsapplication.com/css/style.css" # => http://www.railsapplication.com/css/style.css
+        def stylesheet_path(source)
+          compute_public_path(source, 'stylesheets', 'css')
+        end
+        alias_method :path_to_stylesheet, :stylesheet_path # aliased to avoid conflicts with a stylesheet_path named route
+
+        # Returns a stylesheet link tag for the sources specified as arguments. If
+        # you don't specify an extension, <tt>.css</tt> will be appended automatically.
+        # You can modify the link attributes by passing a hash as the last argument.
+        #
+        # ==== Examples
+        #   stylesheet_link_tag "style" # =>
+        #     <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "style.css" # =>
+        #     <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "http://www.railsapplication.com/style.css" # =>
+        #     <link href="http://www.railsapplication.com/style.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "style", :media => "all" # =>
+        #     <link href="/stylesheets/style.css" media="all" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "style", :media => "print" # =>
+        #     <link href="/stylesheets/style.css" media="print" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "random.styles", "/css/stylish" # =>
+        #     <link href="/stylesheets/random.styles" media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/css/stylish.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        # You can also include all styles in the stylesheets directory using <tt>:all</tt> as the source:
+        #
+        #   stylesheet_link_tag :all # =>
+        #     <link href="/stylesheets/style1.css"  media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/stylesheets/styleB.css"  media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/stylesheets/styleX2.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        # If you want Rails to search in all the subdirectories under stylesheets, you should explicitly set <tt>:recursive</tt>:
+        #
+        #   stylesheet_link_tag :all, :recursive => true
+        #
+        # == Caching multiple stylesheets into one
+        #
+        # You can also cache multiple stylesheets into one file, which requires less HTTP connections and can better be
+        # compressed by gzip (leading to faster transfers). Caching will only happen if config.perform_caching
+        # is set to true (which is the case by default for the Rails production environment, but not for the development
+        # environment). Examples:
+        #
+        # ==== Examples
+        #   stylesheet_link_tag :all, :cache => true # when config.perform_caching is false =>
+        #     <link href="/stylesheets/style1.css"  media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/stylesheets/styleB.css"  media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/stylesheets/styleX2.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag :all, :cache => true # when config.perform_caching is true =>
+        #     <link href="/stylesheets/all.css"  media="screen" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "shop", "cart", "checkout", :cache => "payment" # when config.perform_caching is false =>
+        #     <link href="/stylesheets/shop.css"  media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/stylesheets/cart.css"  media="screen" rel="stylesheet" type="text/css" />
+        #     <link href="/stylesheets/checkout.css" media="screen" rel="stylesheet" type="text/css" />
+        #
+        #   stylesheet_link_tag "shop", "cart", "checkout", :cache => "payment" # when config.perform_caching is true =>
+        #     <link href="/stylesheets/payment.css"  media="screen" rel="stylesheet" type="text/css" />
+        #
+        # The <tt>:recursive</tt> option is also available for caching:
+        #
+        #   stylesheet_link_tag :all, :cache => true, :recursive => true
+        #
+        # To force concatenation (even in development mode) set <tt>:concat</tt> to true. This is useful if
+        # you have too many stylesheets for IE to load.
+        #
+        #   stylesheet_link_tag :all, :concat => true
+        #
+        def stylesheet_link_tag(*sources)
+          options = sources.extract_options!.stringify_keys
+          concat  = options.delete("concat")
+          cache   = concat || options.delete("cache")
+          recursive = options.delete("recursive")
+
+          if concat || (config.perform_caching && cache)
+            joined_stylesheet_name = (cache == true ? "all" : cache) + ".css"
+            joined_stylesheet_path = File.join(joined_stylesheet_name[/^#{File::SEPARATOR}/] ? config.assets_dir : config.stylesheets_dir, joined_stylesheet_name)
+
+            unless config.perform_caching && File.exists?(joined_stylesheet_path)
+              write_asset_file_contents(joined_stylesheet_path, compute_stylesheet_paths(sources, recursive))
+            end
+            stylesheet_tag(joined_stylesheet_name, options)
+          else
+            sources = expand_stylesheet_sources(sources, recursive)
+            ensure_stylesheet_sources!(sources) if cache
+            sources.collect { |source| stylesheet_tag(source, options) }.join("\n").html_safe
+          end
+        end
+
+        private
+
+          def stylesheet_tag(source, options)
+            tag("link", { "rel" => "stylesheet", "type" => Mime::CSS, "media" => "screen", "href" => ERB::Util.html_escape(path_to_stylesheet(source)) }.merge(options), false, false)
+          end
+
+          def compute_stylesheet_paths(*args)
+            expand_stylesheet_sources(*args).collect { |source| compute_public_path(source, 'stylesheets', 'css', false) }
+          end
+
+          def expand_stylesheet_sources(sources, recursive)
+            if sources.first == :all
+              collect_asset_files(config.stylesheets_dir, ('**' if recursive), '*.css')
+            else
+              sources.collect do |source|
+                determine_source(source, self.stylesheet_expansions)
+              end.flatten
+            end
+          end
+
+          def ensure_stylesheet_sources!(sources)
+            sources.each do |source|
+              asset_file_path!(path_to_stylesheet(source))
+            end
+            return sources
+          end
+
+      end
+    end
+  end
+end
\ No newline at end of file