* Generate navascript.java class using REX with following arguments:

  -ll 1 -backtrack -java -tree  -main -name com.dexels.navajo.mapping.compiler.navascript.parser.navascript

* Parser code (navascript.java) generated using this website: https://bottlecaps.de/rex/

* After generating code make sure to add correct package name:

      package com.dexels.navajo.compiler.navascript.parser

* Remove EventHandler interface in generated code, since we are using an extracted version