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Posted to user@commons.apache.org by David S Taylor <da...@bluesunrise.com> on 2017/06/20 01:42:50 UTC

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

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

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

Posted by David S Taylor <da...@bluesunrise.com>.

Thanks Henri that was exactly what I needed!


> On Jun 20, 2017, at 1:51 AM, henrib <he...@apache.org> 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.
> 
> 
> 
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Re: [jexl] - Jexl parser tree - retrieve variables from expression

Posted by henrib <he...@apache.org>.

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.



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