create_template_source

# File actionpack/lib/action_view/base.rb, line 439
      def create_template_source(extension, template, render_symbol, locals)
        if template_requires_setup?(extension)
          body = case extension.to_sym
            when :rxml
              "xml = Builder::XmlMarkup.new(:indent => 2)\n" +
              "@controller.headers['Content-Type'] ||= 'application/xml'\n" +
              template
            when :rjs
              "@controller.headers['Content-Type'] ||= 'text/javascript'\n" +
              "update_page do |page|\n#{template}\nend"
          end
        else
          body = ERB.new(template, nil, @@erb_trim_mode).src
        end

        @@template_args[render_symbol] ||= {}
        locals_keys = @@template_args[render_symbol].keys | locals
        @@template_args[render_symbol] = locals_keys.inject({}) { |h, k| h[k] = true; h }

        locals_code = ""
        locals_keys.each do |key|
          locals_code << "#{key} = local_assigns[:#{key}] if local_assigns.has_key?(:#{key})\n"
        end

        "def #{render_symbol}(local_assigns)\n#{locals_code}#{body}\nend"
      end