code: public static <T> T generateParser(File src) throws Exception
      {
          ANTLRInputStream input = new ANTLRInputStream(new FileInputStream(src));
          Lexer lexer = AunitRuntime.getLexerFactory().generate(input);
          CommonTokenStream tokens = new CommonTokenStream(lexer);
          //noinspection unchecked
          return (T)AunitRuntime.getParserFactory().generate(tokens);
      }
docs: Generate an instance of the configured parser using a file as a
  source for input.
  
  @param src the file to use as input to the new parser instance.
  @param <T> the type of the parser
  @return an instance of the configured parser
  @throws Exception if there is an error generating the parser