[jira] [Commented] (JEXL-113) Need a function to extract which variables are used to evaluate a script (was: Dot notation behaves unexpectedly with null values)

["Henri Biestro (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JEXL-113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063545#comment-13063545 ] 

Henri Biestro commented on JEXL-113:
------------------------------------

Hi Max,
I've added JexlEngine.getVariables() to the trunk (revision 1145359).
Let me know if this is what you expected.
Cheers
Henrib

> Need a function to extract which variables are used to evaluate a script (was: Dot notation behaves unexpectedly with null values)
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JEXL-113
>                 URL: https://issues.apache.org/jira/browse/JEXL-113
>             Project: Commons JEXL
>          Issue Type: Sub-task
>    Affects Versions: 2.0.1
>         Environment: JDK 1.6
>            Reporter: Max Tardiveau
>            Assignee: Henri Biestro
>
> When a variable of the form a.b is evaluated, the context is asked first for the value of a. That value is then asked for the value of b.
> So far, so good: this is exactly what you'd expect from the dot operator.
> But if the value of b is null, the context is then asked for the value of a.b, in other words the dot operator is ignored and "a.b" is considered to be a single variable.
> This is at best confusing. Granted, this can be avoided with the a['b'] notation, but that's clumsy.
> I assume this is an attempt to support both the dot operator and ant-style variables. I don't think you can have both and remain sane.
> Suggestion: either document this behavior, or make it an option. My vote would be to just use the value returned, even if it's null. Either dot is an operator, or it's not. Perhaps make that configurable?
> Thanks!

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