User_Defined_Filters

  The user defined filter facility provides a mechanism whereby
  filters written as DEC Text Processing Utility (DECTPU) programs are
  automatically executed when tests are run. These filters are
  referred to as user filters. The implementation enables users to
  solve easily many filtering problems, often with a single-line
  program, whilst allowing full access to the facilities of DECTPU to
  solve more complex cases. 

  To implement a new filter, a file containing the required DECTPU
  commands is created. There are a number of predefined patterns and a
  global replace procedure provided which can be used to build the
  commands. For example, the following command will replace device
  names that precede a directory with the string "DEVICE":

    global_replace( identifier + ':[' , 'DEVICE:[' )

  The filter can be tested using the /USER_FILTER qualifier to the
  FILTER command. For example: 

    FILTER/USER_FILTER=DEVICE.TPU TEST.DAT

  See help on FILTER /USER_FILTER for more information.

  Alternatively, filters can be developed using the TPU
  pattern style feature of Language-Sensitive Editor.

  To associate a user filter with a test, a logical variable starting
  with the characters "DTM$UF_" is created. The value of the variable
  is the file specification of the file containing the DECTPU
  commands. For example: 

    CREATE VARIABLE /LOGICAL DTM$UF_DEVICE "DISK1:[TEST.FILTERS]DEVICE.TPU"

  The variable is then associated with the test in the usual way, for
  example: 

    MODIFY TEST /VARIABLE=DTM$UF_DEVICE

  When the test is run, as part of a collection, the filter will be
  applied. 

Additional information available:

Variables       Recording_Terminal_Tests        Global_Replace_Procedure
Examples