[jexl] - Jexl parser tree - retrieve variables from expression

[David S Taylor]

JEXL question:

Is there a way to take an expression such as “(x + y) / z)”  and get a parser tree or even just a list of the variables in the expression?

I would like to know what variables are in my expression, in the example above, I would want a list of x,y,z

Is that possible?

Thanks,

—
David

[henrib]

Hi David;
Yes you can if you create a script.
Have a look at http://commons.apache.org/proper/commons-jexl/apidocs/org/apache/commons/jexl3/JexlScript.html#getVariables .
Many examples in
https://github.com/apache/commons-jexl/blob/trunk/src/test/java/org/apache/commons/jexl3/VarTest.java
Cheers.

[David S Taylor]

Thanks Henri that was exactly what I needed!

> On Jun 20, 2017, at 1:51 AM, henrib <[hidden email]> wrote:
>
> Hi David;
> Yes you can if you create a script.
> Have a look at
> http://commons.apache.org/proper/commons-jexl/apidocs/org/apache/commons/jexl3/JexlScript.html#getVariables
> .
> Many examples in
> https://github.com/apache/commons-jexl/blob/trunk/src/test/java/org/apache/commons/jexl3/VarTest.java
> Cheers.
>
>
>
> --
> View this message in context: http://apache-commons.680414.n4.nabble.com/jexl-Jexl-parser-tree-retrieve-variables-from-expression-tp4700492p4700496.html
> Sent from the Commons - User mailing list archive at Nabble.com.
>
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