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https://issues.apache.org/jira/browse/DAFFODIL-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olabusayo Kilo updated DAFFODIL-3048:
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Priority: Minor (was: Major)
> Generalized peek-ahead feature in DFDL
> --------------------------------------
>
> Key: DAFFODIL-3048
> URL: https://issues.apache.org/jira/browse/DAFFODIL-3048
> Project: Daffodil
> Issue Type: New Feature
> Components: Back End, Front End
> Affects Versions: 4.0.0
> Reporter: Mike Beckerle
> Priority: Minor
>
> Daffodil should implement the generalized look-ahead/peek-ahead feature
> described here:
> [https://github.com/OpenGridForum/DFDL/issues/75]
> This is pretty easy to implement. It's a degenerate form of backtracking
> where only the position of the parser is backtracked. The other things,
> infoset, variable-settings, etc are all retained.
> This is an alternative mechanism enabling use of choice-by-dispatch without
> schema authors having to contort the record layouts by hoisting out the
> fields that are dispatched on.
> The optimization described in DAFFODIL-2831 only works if the various record
> types in a choice are distinguished by an initiator.
> This generalized look/peek ahead capability would enable choice-by-dispatch
> on field values that are not necessarily in tthe first position of each
> record, but which are still used uniformly for every record type.
>
>
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