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From "Dmitri Blinov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JEXL-200) Support for dynamic scripting in jexl scripts
Date Fri, 17 Jun 2016 12:02:05 GMT
Dmitri Blinov created JEXL-200:
----------------------------------

             Summary: Support for dynamic scripting in jexl scripts
                 Key: JEXL-200
                 URL: https://issues.apache.org/jira/browse/JEXL-200
             Project: Commons JEXL
          Issue Type: New Feature
    Affects Versions: 3.0
            Reporter: Dmitri Blinov
            Priority: Minor


Allow for dynamically defined functions inside a script where the definition of the function
comes from a string expression, for example:

{code}
def x(y) = "return y+2";
{code}

the defined function should be accessable after its definition is successfully parsed as ordinary
function, and can be evaluated in the current context.

{code}
if (x(40) eq 42) {...
{code}

I think the idea of dynamic script evaluation is not unusual, and though to some extent can
be implemented via side-added functions like *eval(expr)* a dedicated syntax for this will
benefit from the simplicity of ordinal functions and the ability to control mapping of the
arguments between a caller and the defined function.



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