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Change to behavior of :SWITCH … :CASE … :OTHER … :ENDSWITCH statements

  • 1.  Change to behavior of :SWITCH … :CASE … :OTHER … :ENDSWITCH statements

    Posted 16 days ago
    Edited by Michael A. Lowry 13 days ago

    In a relatively recent update to the Automation Engine, the behavior of the :SWITCH … :CASE … :OTHER … :ENDSWITCH statements changed.

    Before this change, it was possible to follow a :CASE statement immediately with the :OTHER statement.

    After the change in behavior, this stopped working.

    For example, the following script used to work fine.

    :SET &ENV# = "PROD"
    :SWITCH &ENV#
    :CASE "DEV"
    :CASE "TEST"
    :CASE "PROD"
    :OTHER
    :  PRINT "Unknown environment: &ENV#"
    :ENDSWITCH

    Now, however, the above script results in the message "Unknown environment: PROD".

    The documentation (v21.0.9) now states:

    :OTHER cannot be used on the line directly following a :CASE line. You must insert a blank line in between. 

    In my testing, I found that a blank line is insufficient. A comment line is also insufficient. (My tests used an SCRI object.)

    To restore the expected behavior, it is now necessary to add at least one scripting statement between the :CASE statement and the :OTHER statement. E.g.,

    :SET &ENV# = "PROD"
    :SWITCH &ENV#
    :CASE "DEV"
    :CASE "TEST"
    :CASE "PROD"
    :  PRINT "Environment: &ENV#"
    :OTHER
    :  PRINT "Unknown environment: &ENV#"
    :ENDSWITCH

    When was this change introduced, and why?

    I also noticed that the OR keyword cannot be used in :CASE statements. E.g.,

    :SET &ENV# = "TEST"
    :SWITCH &ENV#
    :CASE "DEV" OR "TEST" OR "PROD"
    :  P "Environment: &ENV#"
    :OTHER
    :  PRINT "Unknown environment: &ENV#"
    :ENDSWITCH

    This will result in the message "Unknown environment: TEST". I'm almost certain it worked before. A work-around is to use :IF instead.

    :SET &ENV# = "TEST"
    :IF &ENV# = "DEV" OR "TEST" OR "PROD"
    :  P "Environment: &ENV#"
    :ELSE
    :  PRINT "Unknown environment: &ENV#"
    :ENDIF

    Was this also a change, or am I misremembering how it worked before?



  • 2.  RE: Change to behavior of :SWITCH … :CASE … :OTHER … :ENDSWITCH statements

    Posted 12 days ago
    Edited by Michael A. Lowry 12 days ago

    A colleague brought my attention to this AE message:

    U00020432 Runtime error in object '&01', line '&02': script command :CASE must not followed directly by script command :OTHER.

    This message has evidently been around since as least as far back as v11.2.