Simple template Antlr4 gradle template with ANTLR based translation, traversal, and validation.
Just run gradlew from root directory to generate Antlr4 created code, compile actual code, and run unit tests.
Only requirement is a JavaJDK installed.
./gradlewGUI based Antlr Validation tools such as the ANTLR Intellij Plugin help in rapidly verifying Grammer file updates.
Once plugin is installed, you'll have a right click context of Test Rule when viewing the G4 file in the IDE.