code: def file2json(self, jsonfile=None):
          
          kwslist = self.detectAllKws()
          kwsdict = {}
          idx = 0
          for kw in sorted(kwslist, key=str.lower):
              # print kw
              idx += 1
              tdict = self.getKwAsDict(kw)
              self.rpn2val(tdict)
              kwsdict.update(tdict)
              if kw not in self.ctrlconf_dict:
                  ctrlconf = self.getKwCtrlConf(kw, fmt='dict')
                  if ctrlconf is not None:
                      self.ctrlconf_dict.update({kw: ctrlconf})
          kwsdict.update(self.prestrdict)
          ctrlconfdict = {'_epics': self.ctrlconf_dict}  # all epics contrl config in self.ctrlconfdict
          kwsdict.update(ctrlconfdict)
          try:
              with open(os.path.expanduser(jsonfile), 'w') as outfile:
                  json.dump(kwsdict, outfile)
          except:
              pass
          return json.dumps(kwsdict)
docs: Convert entire lte file into json like format
  
          USAGE: 1: kwsdictstr = file2json()
                 2: kwsdictstr = file2json(jsonfile = 'somefile')
  
          show pretty format with pipeline: | jshon, or | pjson
          if jsonfile is defined, dump to defined file before returning json string
          :param jsonfile: filename to dump json strings