how to run antlr grun tool against feel-grammar

[Anonymous]

Hi,

Below are the steps tried:-

1. cloned complete drools project https://github.com/kiegroup/drools

2. mvn clean install -DskipTests

3. created a input file

4. tried running grun

and got below error

[Matteo Mortari]

Hi,

if you goal is to test some FEEL expressions, I believe the easiest way would be to extend some of the tests unit in the code base.

For example: https://github.com/kiegroup/drools/blob/776bda4094cd516485666c315b629246ce7aa3e4/kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/runtime/FEELExpressionsTest.java#L31

but not limiting to, you can take reference other unit tests in the same module.

This way, you don't need to build the complete drools repo, and just work on the IDE

Otherwise, can you explain a bit further what is the requirement behind running "grun", please?

The reason I'm asking is because FEEL, as from the DMN specification, is NOT a context free grammar. Hence I believe any generic tool would not be able to support the full DMN semantic, as you might want to provide which variables are in scope, for more complex expression.

Please let me know, I'd be glad to support further !

MM

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[Anonymous]

Hi, 

we are just interested in studying the parse tree

On Monday, June 10, 2019 at 7:18:01 PM UTC+5:30, Matteo Mortari wrote:

Hi,

if you goal is to test some FEEL expressions, I believe the easiest way would be to extend some of the tests unit in the code base.

For example: https://github.com/kiegroup/drools/blob/776bda4094cd516485666c315b629246ce7aa3e4/kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/runtime/FEELExpressionsTest.java#L31

but not limiting to, you can take reference other unit tests in the same module.

This way, you don't need to build the complete drools repo, and just work on the IDE

Otherwise, can you explain a bit further what is the requirement behind running "grun", please?

The reason I'm asking is because FEEL, as from the DMN specification, is NOT a context free grammar. Hence I believe any generic tool would not be able to support the full DMN semantic, as you might want to provide which variables are in scope, for more complex expression.

Please let me know, I'd be glad to support further !

MM

On Mon, 10 Jun 2019 at 15:22, Anonymous <yoyo.pr...@gmail.com> wrote:

Hi,

Below are the steps tried:-

1. cloned complete drools project https://github.com/kiegroup/drools

2. mvn clean install -DskipTests

3. created a input file

4. tried running grun

and got below error

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[Matteo Mortari]

Hi,

then indeed using the test cases imho is the best way to go, the "grun" from Antlr does not support implementation for non-context-free grammar scenario in an easy way.

Using the unit test will ensure you are using the non-context-free grammar correctly.

IFF you really, really want to just rely on what defined in the .g4 grammar, at the expense of potential pitfalls due to the non-context-free, personally I believe is much more easier to use the ANLTR4 extension from VSCode

I attach screenshot below

Hope this helps, available if any further questions or doubts!

MM

Hi, 

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[Anonymous]

Hi,

Thanks for the reply i can generate the tree. Can you help me out with a simple test case that has a some function invocation, say sum(1, 2)

On Tuesday, June 11, 2019 at 1:44:27 PM UTC+5:30, Matteo Mortari wrote:

Hi,

Hi, 

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[Matteo Mortari]

Hi

you mean like this one? 

https://github.com/kiegroup/drools/blob/24faa77aba35e84702c444841086135b5f97af8f/kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/runtime/FEELFunctionsTest.java#L89

HTH,

MM

Hi, 

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[Matteo Mortari]

Hi Anonymous / "yoyo.predator123@",

FYI we recently merged an extension which allows to properly run Antlr's "grun" with the FEEL .g4 grammar.

You can find instructions here: https://github.com/kiegroup/drools/tree/master/kie-dmn#developer-tooling-using-antlrs-grun

If you want to leverage the non-context-free features you cannot rely just on the command line, but you must provide programmatically the variables in scope.

In this specific case, you can reference this helper program instead: https://github.com/kiegroup/drools/blob/37dc2a5f1d04d6e00b6445d3f94e2e98750af2d9/kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/parser/feel11/FEELTestRigExample.java#L34

Example result:

I hope this helps and please let us know if any feedback, I hope this is helpful.

MM