Allow all variable names to be retrieve from ScopeChain/Scope

[zemian]

Hi,

I want to write a custom function to return all the variable names available from the current context (it's very valuable for debugging purpose). I can get ScopeChain from EvaluationContext, but there is no method exposed to retrieve all the keys from each Scope's backingMap. I got around this by using Java reflection so far, but it will be nice to have this available from the API.

Thanks,
Zemian

[axeld]

I second this, not just for debugging purposes. I've implemented a function that allows expression evaluation within my application (it comes with its own expression language); there is currently no way to pass on the scope chain as bindings.

[ashokgelal]

@ebussieres Can we have this please? This seems very trivial to add (just a function) and I don't see any downside of this. I can send a PR but I'm not sure whether you want this supported or not.

[ebussieres]

Sure, just make a PR and I'll gladly review it