Filter Blank HL7 Fields

[Andrew Deters]

I put this script together from several different resources.  I couldn’t find any other script that would filter on blank fields (active nulls “” or truly blank).  I saw reference to another script that did the same thing but could not find it.  Standard disclaimer applies 😆

######################################################################

# Name: tps_filterBlankHL7Field.tcl

# Purpose:

# UPoC type: tps

# Args: tps keyedlist containing the following keys:

#       MODE    run mode (“start”, “run” or “time”)

#       MSGID   message handle

#       ARGS    user-supplied arguments:

# Segment Name, Field Number, Sub Field Number

#               Ex. {SEGNAME PID} {FIELDNUM 18} {SUBFIELDNUM 0}

#    will filter all messages with blanks or active nulls in PID 18.0

#                      

# Returns: tps disposition list:

#          

#

proc tps_filterBlankHL7Field { args } {

   keylget args MODE mode               ;# Fetch mode

   set dispList {} ;# Nothing to return

   switch -exact — $mode {

       start {

           # Perform special init functions

   # N.B.: there may or may not be a MSGID key in args

       }

       run {

   # ‘run’ mode always has a MSGID; fetch and process it

           keylget args MSGID mh

   set segname {}

   keylget args ARGS.SEGNAME segname

   set fieldnum {}

   keylget args ARGS.FIELDNUM fieldnum

   set subfieldnum {}

     keylget args ARGS.SUBFIELDNUM subfieldnum

   set RESULT CONTINUE

   set msg [msgget $mh]

   set sep [csubstr $msg 3 1]

   set sub [csubstr $msg 4 1]

   set subsub [csubstr $msg 5 1]

   set seg_list [split $msg r]

       foreach item $seg_list {

set seg_id [crange $item 0 2]

if [cequal $seg_id $segname] {

       set fields [split $item $sub]

set checkfield [lindex $fields $fieldnum]

set subfields [split $checkfield $subsub]

set checkvalue [lindex $subfields $subfieldnum]

if {[cequal [string map {{“} {}} $checkvalue] “”]} {

  set RESULT “KILL”

}

}

           }

   if {[cequal $RESULT “KILL”]} {

      lappend dispList “KILL $mh”

   } else {

      lappend dispList “CONTINUE $mh”

   }

       }

       time {

           # Timer-based processing

   # N.B.: there may or may not be a MSGID key in args

       }

       

       shutdown {

   # Doing some clean-up work

}

   }

   return $dispList

}

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