Location of DMN FEEL Grammar

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I am looking for formal DMN FEEL grammar (g4 file) to generate ANTLR4 based parser out of it. I am not able to find the grammar file.

Can you please provide where it can be found?

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https://github.com/kiegroup/drools/blob/main/kie-dmn/kie-dmn-feel/src/main/antlr4/org/kie/dmn/feel/parser/feel11/FEEL_1_1.g4

For future reference I found it like this:

  1. Googled "github drools" to find the official repository.
  2. Searched for a file named "g4".