How to return an action value from a JavaScript callback in ANTLR?

[Sebastian Wain]

I asked this question on StackOverflow. It is clear how to return a value in an action rule in languages such as Java and C# but in JavaScript we need some kind of callback mechanism if the result value comes from a function callback.

What are the alternatives to solve this issue?

Thanks,

Sebastian

[Eric Vergnaud]

Hi,

Comments from Pointy on StackOverflow say it all.

Asynchronous calls are not supported and we have no plans to implement them.

This would require changing the antlr grammar itself.

As a general rule (for all targets), code in action rules is supported but discouraged.

You should use a listener or visitor instead, which give you much more flexibility.

Eric