Do not hard code encoding to UTF8

actionpack/lib/action_view/template.rb

@@ -173,6 +173,52 @@ module ActionView
       @inspect ||= defined?(Rails.root) ? identifier.sub("#{Rails.root}/", '') : identifier
     end
 
+    # This method is responsible for properly setting he encoding of the
+    # source. Until this point, we assume that the source is BINARY data.
+    # If no additional information is supplied, we assume the encoding is
+    # the same as <tt>Encoding.default_external</tt>.
+    #
+    # The user can also specify the encoding via a comment on the first
+    # line of the template (# encoding: NAME-OF-ENCODING). This will work
+    # with any template engine, as we process out the encoding comment
+    # before passing the source on to the template engine, leaving a
+    # blank line in its stead.
+    def encode!
+      return unless source.encoding == Encoding::BINARY
+
+      if source.encoding_aware?
+        # Look for # encoding: *. If we find one, we'll encode the
+        # String in that encoding, otherwise, we'll use the
+        # default external encoding.
+        if source.sub!(/\A#{ENCODING_FLAG}/, '')
+          encoding = magic_encoding = $1
+        else
+          encoding = Encoding.default_external
+        end
+
+        # Tag the source with the default external encoding
+        # or the encoding specified in the file
+        source.force_encoding(encoding)
+
+        # If the user didn't specify an encoding, and the handler
+        # handles encodings, we simply pass the String as is to
+        # the handler (with the default_external tag)
+        if !magic_encoding && @handler.respond_to?(:handles_encoding?) && @handler.handles_encoding?
+          source
+        # Otherwise, if the String is valid in the encoding,
+        # encode immediately to default_internal. This means
+        # that if a handler doesn't handle encodings, it will
+        # always get Strings in the default_internal
+        elsif source.valid_encoding?
+          source.encode!
+        # Otherwise, since the String is invalid in the encoding
+        # specified, raise an exception
+        else
+          raise WrongEncodingError.new(source, encoding)
+        end
+      end
+    end
+
     protected
 
       # Compile a template. This method ensures a template is compiled
@@ -195,15 +241,7 @@ module ActionView
       end
 
       # Among other things, this method is responsible for properly setting
-      # the encoding of the source. Until this point, we assume that the
-      # source is BINARY data. If no additional information is supplied,
-      # we assume the encoding is the same as <tt>Encoding.default_external</tt>.
-      #
-      # The user can also specify the encoding via a comment on the first
-      # line of the template (# encoding: NAME-OF-ENCODING). This will work
-      # with any template engine, as we process out the encoding comment
-      # before passing the source on to the template engine, leaving a
-      # blank line in its stead.
+      # the encoding of the compiled template.
       #
       # If the template engine handles encodings, we send the encoded
       # String to the engine without further processing. This allows
@@ -215,40 +253,8 @@ module ActionView
       # In general, this means that templates will be UTF-8 inside of Rails,
       # regardless of the original source encoding.
       def compile(view, mod) #:nodoc:
+        encode!
         method_name = self.method_name
-
-        if source.encoding_aware?
-          # Look for # encoding: *. If we find one, we'll encode the
-          # String in that encoding, otherwise, we'll use the
-          # default external encoding.
-          if source.sub!(/\A#{ENCODING_FLAG}/, '')
-            encoding = magic_encoding = $1
-          else
-            encoding = Encoding.default_external
-          end
-
-          # Tag the source with the default external encoding
-          # or the encoding specified in the file
-          source.force_encoding(encoding)
-
-          # If the user didn't specify an encoding, and the handler
-          # handles encodings, we simply pass the String as is to
-          # the handler (with the default_external tag)
-          if !magic_encoding && @handler.respond_to?(:handles_encoding?) && @handler.handles_encoding?
-            source
-          # Otherwise, if the String is valid in the encoding,
-          # encode immediately to default_internal. This means
-          # that if a handler doesn't handle encodings, it will
-          # always get Strings in the default_internal
-          elsif source.valid_encoding?
-            source.encode!
-          # Otherwise, since the String is invalid in the encoding
-          # specified, raise an exception
-          else
-            raise WrongEncodingError.new(source, encoding)
-          end
-        end
-
         code = @handler.call(self)
 
         # Make sure that the resulting String to be evalled is in the
@@ -297,7 +303,11 @@ module ActionView
           raise e
         else
           assigns  = view.respond_to?(:assigns) ? view.assigns : {}
-          template = @virtual_path ? refresh(view) : self
+          template = self
+          unless template.source
+            template = refresh(view)
+            template.encode!
+          end
           raise Template::Error.new(template, assigns, e)
         end
       end

actionpack/lib/action_view/template/error.rb

@@ -89,14 +89,10 @@ module ActionView
         line_counter = start_on_line
         return unless source_code = source_code[start_on_line..end_on_line]
 
-        extract = source_code.sum do |line|
+        source_code.sum do |line|
           line_counter += 1
           "#{indent}#{line_counter}: #{line}\n"
         end
-
-        extract.force_encoding("UTF-8") if extract.respond_to?(:encode!)
-
-        extract
       end
 
       def sub_template_of(template_path)