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Posted to dev@daffodil.apache.org by "Michael Beckerle (JIRA)" <ji...@apache.org> on 2018/07/31 16:28:00 UTC

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

    [ https://issues.apache.org/jira/browse/DAFFODIL-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16563929#comment-16563929 ] 

Michael Beckerle commented on DAFFODIL-1919:
--------------------------------------------

Review PR https://github.com/apache/incubator-daffodil/pull/88

> Trailing Separator Suppression
> ------------------------------
>
>                 Key: DAFFODIL-1919
>                 URL: https://issues.apache.org/jira/browse/DAFFODIL-1919
>             Project: Daffodil
>          Issue Type: Bug
>          Components: DFDL Language
>    Affects Versions: 2.0.0
>            Reporter: Josh Adams
>            Assignee: Michael Beckerle
>            Priority: Major
>             Fix For: 2.2.0
>
>
> 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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