commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Sebb (Closed) (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (JEXL-114) Allow scripts to create local variables // Add return keyword
Date Wed, 14 Dec 2011 09:28:30 GMT

     [ https://issues.apache.org/jira/browse/JEXL-114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebb closed JEXL-114.
---------------------

    Assignee:     (was: Henri Biestro)
    
> 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: New Feature
>    Affects Versions: 2.0.1
>            Reporter: Henri Biestro
>             Fix For: 2.1
>
>
> 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message