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@@ -4,10 +4,10 @@ require 'action_view/helpers/prototype_helper'
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 module ActionView
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   module Helpers
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     # Provides functionality for working with JavaScript in your views.
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-    # 
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+    #
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     # == Ajax, controls and visual effects
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-    # 
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-    # * For information on using Ajax, see 
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+    #
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+    # * For information on using Ajax, see
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     #   ActionView::Helpers::PrototypeHelper.
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     # * For information on using controls and visual effects, see
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     #   ActionView::Helpers::ScriptaculousHelper.
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@@ -20,22 +20,22 @@ module ActionView
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     # and ActionView::Helpers::ScriptaculousHelper), you must do one of the
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     # following:
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     #
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-    # * Use <tt><%= javascript_include_tag :defaults %></tt> in the HEAD 
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-    #   section of your page (recommended): This function will return 
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+    # * Use <tt><%= javascript_include_tag :defaults %></tt> in the HEAD
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+    #   section of your page (recommended): This function will return
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     #   references to the JavaScript files created by the +rails+ command in
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     #   your <tt>public/javascripts</tt> directory. Using it is recommended as
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-    #   the browser can then cache the libraries instead of fetching all the 
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+    #   the browser can then cache the libraries instead of fetching all the
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     #   functions anew on every request.
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-    # * Use <tt><%= javascript_include_tag 'prototype' %></tt>: As above, but 
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+    # * Use <tt><%= javascript_include_tag 'prototype' %></tt>: As above, but
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     #   will only include the Prototype core library, which means you are able
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-    #   to use all basic AJAX functionality. For the Scriptaculous-based 
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-    #   JavaScript helpers, like visual effects, autocompletion, drag and drop 
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+    #   to use all basic AJAX functionality. For the Scriptaculous-based
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+    #   JavaScript helpers, like visual effects, autocompletion, drag and drop
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     #   and so on, you should use the method described above.
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     # * Use <tt><%= define_javascript_functions %></tt>: this will copy all the
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     #   JavaScript support functions within a single script block. Not
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     #   recommended.
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     #
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-    # For documentation on +javascript_include_tag+ see 
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+    # For documentation on +javascript_include_tag+ see
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     # ActionView::Helpers::AssetTagHelper.
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     module JavaScriptHelper
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       unless const_defined? :JAVASCRIPT_PATH
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@@ -43,13 +43,13 @@ module ActionView
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       end
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       include PrototypeHelper
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-      
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-      # Returns a link that will trigger a JavaScript +function+ using the 
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+
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+      # Returns a link that will trigger a JavaScript +function+ using the
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       # onclick handler and return false after the fact.
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       #
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       # The +function+ argument can be omitted in favor of an +update_page+
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       # block, which evaluates to a string when the template is rendered
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-      # (instead of making an Ajax request first).      
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+      # (instead of making an Ajax request first).
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       #
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       # Examples:
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       #   link_to_function "Greeting", "alert('Hello world!')"
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@@ -70,36 +70,31 @@ module ActionView
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       #       <a href="#" id="more_link" onclick="try {
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       #         $(&quot;details&quot;).visualEffect(&quot;toggle_blind&quot;);
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       #         $(&quot;more_link&quot;).update(&quot;Show me less&quot;);
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-      #       } 
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-      #       catch (e) { 
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-      #         alert('RJS error:\n\n' + e.toString()); 
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+      #       }
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+      #       catch (e) {
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+      #         alert('RJS error:\n\n' + e.toString());
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       #         alert('$(\&quot;details\&quot;).visualEffect(\&quot;toggle_blind\&quot;);
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       #         \n$(\&quot;more_link\&quot;).update(\&quot;Show me less\&quot;);');
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-      #         throw e 
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+      #         throw e
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       #       };
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       #       return false;">Show me more</a>
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       #
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       def link_to_function(name, *args, &block)
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-        html_options = args.extract_options!
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-        function = args[0] || ''
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-
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-        html_options.symbolize_keys!
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-        function = update_page(&block) if block_given?
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-        content_tag(
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-          "a", name, 
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-          html_options.merge({ 
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-            :href => html_options[:href] || "#", 
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-            :onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function}; return false;" 
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-          })
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-        )
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+        html_options = args.extract_options!.symbolize_keys!
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+
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+        function = block_given? ? update_page(&block) : args[0] || ''
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+        onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;"
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+        href = html_options[:href] || '#'
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+
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+        content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick))
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       end
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-      
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-      # Returns a button that'll trigger a JavaScript +function+ using the 
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+
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+      # Returns a button that'll trigger a JavaScript +function+ using the
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       # onclick handler.
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       #
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       # The +function+ argument can be omitted in favor of an +update_page+
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       # block, which evaluates to a string when the template is rendered
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-      # (instead of making an Ajax request first).      
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+      # (instead of making an Ajax request first).
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       #
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       # Examples:
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       #   button_to_function "Greeting", "alert('Hello world!')"
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@@ -111,45 +106,56 @@ module ActionView
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       #     page[:details].visual_effect :toggle_slide
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       #   end
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       def button_to_function(name, *args, &block)
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-        html_options = args.extract_options!
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-        function = args[0] || ''
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-
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-        html_options.symbolize_keys!
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-        function = update_page(&block) if block_given?
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-        tag(:input, html_options.merge({ 
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-          :type => "button", :value => name, 
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-          :onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function};" 
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-        }))
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+        html_options = args.extract_options!.symbolize_keys!
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+
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+        function = block_given? ? update_page(&block) : args[0] || ''
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+        onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function};"
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+
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+        tag(:input, html_options.merge(:type => 'button', :value => name, :onclick => onclick))
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       end
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-      # Includes the Action Pack JavaScript libraries inside a single <script> 
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+      # Includes the Action Pack JavaScript libraries inside a single <script>
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       # tag. The function first includes prototype.js and then its core extensions,
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       # (determined by filenames starting with "prototype").
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       # Afterwards, any additional scripts will be included in undefined order.
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       #
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       # Note: The recommended approach is to copy the contents of
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       # lib/action_view/helpers/javascripts/ into your application's
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-      # public/javascripts/ directory, and use +javascript_include_tag+ to 
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+      # public/javascripts/ directory, and use +javascript_include_tag+ to
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       # create remote <script> links.
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       def define_javascript_functions
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         javascript = "<script type=\"#{Mime::JS}\">"
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-        
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-        # load prototype.js and its extensions first 
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+
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+        # load prototype.js and its extensions first
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         prototype_libs = Dir.glob(File.join(JAVASCRIPT_PATH, 'prototype*')).sort.reverse
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-        prototype_libs.each do |filename| 
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+        prototype_libs.each do |filename|
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           javascript << "\n" << IO.read(filename)
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         end
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-        
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+
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         # load other libraries
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-        (Dir.glob(File.join(JAVASCRIPT_PATH, '*')) - prototype_libs).each do |filename| 
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+        (Dir.glob(File.join(JAVASCRIPT_PATH, '*')) - prototype_libs).each do |filename|
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           javascript << "\n" << IO.read(filename)
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         end
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         javascript << '</script>'
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       end
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+
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+      JS_ESCAPE_MAP = {
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+        '\\'    => '\\\\',
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+        '</'    => '<\/',
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+        "\r\n"  => '\n',
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+        "\n"    => '\n',
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+        "\r"    => '\n',
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+        '"'     => '\\"',
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+        "'"     => "\\'" }
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+
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       # Escape carrier returns and single and double quotes for JavaScript segments.
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       def escape_javascript(javascript)
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-        (javascript || '').gsub('\\','\0\0').gsub('</','<\/').gsub(/\r\n|\n|\r/, "\\n").gsub(/["']/) { |m| "\\#{m}" }
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+        if javascript
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+          javascript.gsub(/(\\|<\/|\r\n|[\n\r"'])/) { JS_ESCAPE_MAP[$1] }
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+        else
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+          ''
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+        end
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       end
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       # Returns a JavaScript tag with the +content+ inside. Example:
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@@ -163,7 +169,7 @@ module ActionView
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       #   </script>
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       #
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       # +html_options+ may be a hash of attributes for the <script> tag. Example:
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-      #   javascript_tag "alert('All is good')", :defer => 'defer' 
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+      #   javascript_tag "alert('All is good')", :defer => 'defer'
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       #   # => <script defer="defer" type="text/javascript">alert('All is good')</script>
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       #
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       # Instead of passing the content as an argument, you can also use a block
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@@ -180,30 +186,37 @@ module ActionView
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             content_or_options_with_block
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           end
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-        tag = content_tag("script", javascript_cdata_section(content), html_options.merge(:type => Mime::JS))
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+        tag = content_tag(:script, javascript_cdata_section(content), html_options.merge(:type => Mime::JS))
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-        block_given? ? concat(tag) : tag
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+        if block_called_from_erb?(block)
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+          concat(tag)
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+        else
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+          tag
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+        end
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       end
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       def javascript_cdata_section(content) #:nodoc:
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         "\n//#{cdata_section("\n#{content}\n//")}\n"
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       end
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-      
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+
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     protected
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       def options_for_javascript(options)
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-        '{' + options.map {|k, v| "#{k}:#{v}"}.sort.join(', ') + '}'
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+        if options.empty?
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+          '{}'
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+        else
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+          "{#{options.keys.map { |k| "#{k}:#{options[k]}" }.sort.join(', ')}}"
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+        end
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       end
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-      
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+
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       def array_or_string_for_javascript(option)
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-        js_option = if option.kind_of?(Array)
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+        if option.kind_of?(Array)
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           "['#{option.join('\',\'')}']"
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         elsif !option.nil?
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           "'#{option}'"
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         end
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-        js_option
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       end
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     end
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-    
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+
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     JavascriptHelper = JavaScriptHelper unless const_defined? :JavascriptHelper
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   end
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 end

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@@ -115,7 +115,7 @@ module ActionView
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         # can't take an <% end %> later on, so we have to use <% ... %>
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         # and implicitly concat.
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         def block_called_from_erb?(block)
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-          eval(BLOCK_CALLED_FROM_ERB, block)
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+          block && eval(BLOCK_CALLED_FROM_ERB, block)
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         end
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         def content_tag_string(name, content, options, escape = true)

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@@ -535,7 +535,7 @@ module ActionView
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             when method
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               "#{method_javascript_function(method, url, href)}return false;"
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             when popup
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-              popup_javascript_function(popup) + 'return false;'
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+              "#{popup_javascript_function(popup)}return false;"
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             else
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               html_options["onclick"]
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           end