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https://issues.apache.org/jira/browse/SLING-7772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148665#comment-17148665
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Nicolas Peltier commented on SLING-7772:
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ho [~bdelacretaz] just saw your comment, so yeah, using embedded JEXL finally 
as i was too lazy to implement my own :) and yes, it's possible to use whatever 
"external" scripting engine by adding "engine" binding or property to the pipe. 
Your proposal of one engine per expression is interesting but will not be 
implemented yet :) initializing an engine each time with context will (i think) 
take time.

> add other scripting options for pipe expressions
> ------------------------------------------------
>
>                 Key: SLING-7772
>                 URL: https://issues.apache.org/jira/browse/SLING-7772
>             Project: Sling
>          Issue Type: Improvement
>          Components: Extensions, pipes
>    Affects Versions: Pipes 2.0.2
>            Reporter: Nicolas Peltier
>            Priority: Major
>             Fix For: Pipes 3.2.0
>
>
> nashorn is being deprecated (http://openjdk.java.net/jeps/335). There might 
> be another option soon, that will be another dependency.
> Thinking about it, we should provide an option for script in pipe expression 
> (which should be fairly easy to do). And may be thinking of changing the 
> default script engine not to be JS anymore but something that does not need 
> dependency installed, popular and performant



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