class Sprockets::DirectiveProcessor

def process_source
  unless @has_written_body || processed_header.empty?
    @result << processed_header << "\n"
  end
  included_pathnames.each do |pathname|
    @result << context.evaluate(pathname)
  end
  unless @has_written_body
    @result << body
  end
  if compat? && constants.any?
    @result.gsub!(/<%=(.*?)%>/) { constants[$1.strip] }
  end
end