A simple example of using Antlr4 to generate a C++ Parser / Lexer, for Modelica. The Modelica grammar for Antlr4 is from here.
To run the example, simply run ./run.sh or make
The example presumes that the java executable is on your path.
The output includes
modelicaLexer.*: Antlr4 Lexer for Modelica
modelicaParser.*: Antlr4 Parser for Modelica
modelicaListener.*: Antlr4 Listener implementation for Modelica
Note that the Listener classes are optional: not every application of Antlr4 requires a listener.