[jira] [Updated] (DAFFODIL-3048) Generalized peek-ahead feature in DFDL

["Olabusayo Kilo (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DAFFODIL-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Olabusayo Kilo updated DAFFODIL-3048:
-------------------------------------
    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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