Adds a setting to cache textile rendering (off by default).

* it uses ActionController cache store which is MemoryStore by default and can be configured with config.action_controller.cache_store
* macro processing was moved out of textile rendering so that it doesn't get cached
* no noticeable improvement is expected for small portions of text, so only texts larger than 2KB are cached

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3372 e93f8b46-1217-0410-a6f0-8f06a7374b81

1 files changed, 52 insertions, 1 deletions

diff --git a/lib/redmine/wiki_formatting.rb b/lib/redmine/wiki_formatting.rb
index f33ef9e6d..21e8be66b 100644
--- a/lib/redmine/wiki_formatting.rb
+++ b/lib/redmine/wiki_formatting.rb
@@ -44,7 +44,58 @@ module Redmine
       end
       
       def to_html(format, text, options = {}, &block)
-        formatter_for(format).new(text).to_html(&block)
+        text = if Setting.cache_formatted_text? && text.size > 2.kilobyte && cache && cache_key = cache_key_for(format, options[:object], options[:attribute])
+          # Text retrieved from the cache store may be frozen
+          # We need to dup it so we can do in-place substitutions with gsub!
+          cache.fetch cache_key do
+            formatter_for(format).new(text).to_html
+          end.dup
+        else
+          formatter_for(format).new(text).to_html
+        end
+        if block_given?
+          execute_macros(text, block)
+        end
+        text
+      end
+
+      # Returns a cache key for the given text +format+, +object+ and +attribute+ or nil if no caching should be done
+      def cache_key_for(format, object, attribute)
+        if object && attribute && !object.new_record? && object.respond_to?(:updated_on) && !format.blank?
+          "formatted_text/#{format}/#{object.class.model_name.cache_key}/#{object.id}-#{attribute}-#{object.updated_on.to_s(:number)}"
+        end
+      end
+      
+      # Returns the cache store used to cache HTML output
+      def cache
+        ActionController::Base.cache_store
+      end
+      
+      MACROS_RE = /
+                    (!)?                        # escaping
+                    (
+                    \{\{                        # opening tag
+                    ([\w]+)                     # macro name
+                    (\(([^\}]*)\))?             # optional arguments
+                    \}\}                        # closing tag
+                    )
+                  /x unless const_defined?(:MACROS_RE)
+      
+      # Macros substitution
+      def execute_macros(text, macros_runner)
+        text.gsub!(MACROS_RE) do
+          esc, all, macro = $1, $2, $3.downcase
+          args = ($5 || '').split(',').each(&:strip)
+          if esc.nil?
+            begin
+              macros_runner.call(macro, args)
+            rescue => e
+              "<div class=\"flash error\">Error executing the <strong>#{macro}</strong> macro (#{e})</div>"
+            end || all
+          else
+            all
+          end
+        end
       end
     end