DTM, User Defined Filters
*Conan The Librarian
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 Compaq 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.
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