instance method compile

# File actionpack/lib/action_view/template.rb, line 188
      def compile(locals, view, mod)
        method_name = build_method_name(locals)
        return method_name if view.respond_to?(method_name)

        locals_code = locals.keys.map! { |key| "#{key} = local_assigns[:#{key}];" }.join

        if source.encoding_aware?
          # Avoid performing in-place mutation for SafeBuffer
          @source = source.to_str if source.html_safe?

          # 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
        # encoding of the code
        source = <<-end_src
          def #{method_name}(local_assigns)
            _old_virtual_path, @_virtual_path = @_virtual_path, #{@virtual_path.inspect};_old_output_buffer = @output_buffer;#{locals_code};#{code}
          ensure
            @_virtual_path, @output_buffer = _old_virtual_path, _old_output_buffer
          end
        end_src

        if source.encoding_aware?
          # Make sure the source is in the encoding of the returned code
          source.force_encoding(code.encoding)

          # In case we get back a String from a handler that is not in
          # BINARY or the default_internal, encode it to the default_internal
          source.encode!

          # Now, validate that the source we got back from the template
          # handler is valid in the default_internal. This is for handlers
          # that handle encoding but screw up
          unless source.valid_encoding?
            raise WrongEncodingError.new(@source, Encoding.default_internal)
          end
        end

        begin
          mod.module_eval(source, identifier, 0)
          ObjectSpace.define_finalizer(self, Finalizer[method_name, mod])

          method_name
        rescue Exception => e # errors from template code
          if logger = (view && view.logger)
            logger.debug "ERROR: compiling #{method_name} RAISED #{e}"
            logger.debug "Function body: #{source}"
            logger.debug "Backtrace: #{e.backtrace.join("\n")}"
          end

          raise ActionView::Template::Error.new(self, {}, e)
        end
      end