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https://issues.apache.org/jira/browse/JEXL-114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063546#comment-13063546
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Henri Biestro commented on JEXL-114:
------------------------------------
Initial drop in trunk revision 1145359.
> Allow scripts to create local variables // Add return keyword
> -------------------------------------------------------------
>
> Key: JEXL-114
> URL: https://issues.apache.org/jira/browse/JEXL-114
> Project: Commons JEXL
> Issue Type: Improvement
> Affects Versions: 2.0.1
> Reporter: Henri Biestro
> Assignee: Henri Biestro
> Fix For: 2.0.2
>
>
> WHY:
> Not having local variables nor return in scripts is inconvenient, especially
> when dealing with loops.
> This also precludes using read-only contexts easily which are really
> convenient when letting end-users enter their own expressions.
> HOW:
> This could (will) be implemented by extending the parameters feature (script
> accept parameters during parsing and thus arguments during evaluation) which
> is itself based on the notion of 'registers' - an array of objects that the
> interpreter allocates and uses based on script information.
> It only requires adding one keyword ("var" seems the obvious choice) in the
> .jjt.
> The "return" keyword is also an easy .jjt addition; obvious implementation is
> to use an internal exception to force traversing the stack up.
> WHAT:
> Add the "var" and "return" keyword.
> Also add methods to extract the variables (global - see JEXL-113), the
> parameters (used during parsing) and the local variables (declared within) a
> script to help pinpoint problems or prepare the evaluation of scripts.
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