You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mainframe.rb
    path of file: ./repos/metasploit-framework/lib/msf/core/payload
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-

###
# This class is here to implement a
    
  def jcl_jobcard
    # format parameters with basic constraints
    # see http://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/
    #     com.ibm.zos.v2r1.ieab600/iea3b6_Parameter_field8.htm
    #
    jobname = format('%1.8s', datastore['JOBNAME']).strip.upcase
    actnum  = format('%1.60s', datastore['ACTNUM']).strip.upcase
    pgmname = format('%1.20s', datastore['PGMNAME']).strip
    jclass  = format('%1.1s', datastore['JCLASS']).strip.upcase
    notify  = format('%1.8s', datastore['NOTIFY']).strip.upcase
    notify  = if !notify.empty? && datastore['NTFYUSR']
                "//   NOTIFY=#{notify}, \n"
              else
                ""
              end