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Posted to dev@daffodil.apache.org by "Michael Beckerle (JIRA)" <ji...@apache.org> on 2019/05/23 17:25:02 UTC

[jira] [Resolved] (DAFFODIL-1919) Trailing Separator Suppression

     [ https://issues.apache.org/jira/browse/DAFFODIL-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Beckerle resolved DAFFODIL-1919.
----------------------------------------
    Resolution: Fixed
      Assignee: Dave Thompson  (was: Michael Beckerle)

Fixed in 53d6b4f342140f9a807ee1ca087dbeaf0367ade7

> Trailing Separator Suppression
> ------------------------------
>
>                 Key: DAFFODIL-1919
>                 URL: https://issues.apache.org/jira/browse/DAFFODIL-1919
>             Project: Daffodil
>          Issue Type: Bug
>          Components: Compatibility, DFDL Language
>    Affects Versions: 2.0.0
>            Reporter: Josh Adams
>            Assignee: Dave Thompson
>            Priority: Major
>              Labels: ForInteroperabilityTest
>             Fix For: 2.4.0
>
>
> Working with Mike on getting the IBMTLOG schema project working, we have come to the conclusion that Daffodil's compiler and runtime cannot correctly support trailing suppression without some major refactoring.
> We can currently support separatorSuppresssionPolicy always or never, but trailing suppression requires backtracking that will need its own iterative combinators.
> Pull request 55 (which should be pushed upstream soon after the creation of this ticket) includes a couple tests that demonstrate what works and doesn't work with our current implementation.  I believe that we can currently support trailing suppression for required elements, but for optional separated elements things break down when the first element of a sequence is optional and missing.  See org.apache.daffodil.section13.packed.TestPacked.testDelimitedIBM4690IntOptSeq02



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