diff --git a/app/models/chunks/engines.rb b/app/models/chunks/engines.rb
index f125203c..9d8dd009 100644
--- a/app/models/chunks/engines.rb
+++ b/app/models/chunks/engines.rb
@@ -9,30 +9,45 @@ require 'chunks/chunk'
 # or RDoc to convert text. This markup occurs when the chunk is required
 # to mask itself.
 module Engines
-  class Textile < Chunk::Abstract
-    def self.pattern() /^(.*)$/m end
+  class AbstractEngine < Chunk::Abstract
+
+    # Create a new chunk for the whole content and replace it with its mask.
+    def self.apply_to(content)
+      new_chunk = self.new(content)
+      content.chunks << new_chunk
+      content.replace(new_chunk.mask(content))
+    end
+
+    def unmask(content) 
+      self
+    end
+
+    private 
+
+    # Never create engines by constructor - use apply_to instead
+    def initialize(text) 
+      @text = text 
+    end
+
+  end
+
+  class Textile < AbstractEngine
     def mask(content)
       RedCloth.new(text,content.options[:engine_opts]).to_html
     end
-    def unmask(content) self end
   end
 
-  class Markdown < Chunk::Abstract
-    def self.pattern() /^(.*)$/m end
+  class Markdown < AbstractEngine
     def mask(content)
       BlueCloth.new(text,content.options[:engine_opts]).to_html
     end
-    def unmask(content) self end
   end
 
-  class RDoc < Chunk::Abstract
-    def self.pattern() /^(.*)$/m end
+  class RDoc < AbstractEngine
     def mask(content)
       RDocSupport::RDocFormatter.new(text).to_html
     end
-    def unmask(content) self end
   end
 
   MAP = { :textile => Textile, :markdown => Markdown, :rdoc => RDoc }
 end
-