[
https://issues.apache.org/jira/browse/DAFFODIL-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Josh Adams updated DAFFODIL-1919:
---------------------------------
Description:
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
was:
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.
> 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
> Priority: Major
>
> 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
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
