final Constructor<? extends Lexer> lexerCtor = lexerClass.getConstructor(CharStream.class);
final Constructor<? extends Parser> parserCtor = parserClass.getConstructor(TokenStream.class);
// construct initial instances of the lexer and parser to deserialize their ATNs
TokenSource tokenSource = lexerCtor.newInstance(new ANTLRInputStream(""));
parserCtor.newInstance(new CommonTokenStream(tokenSource));
return new ParserFactory() {
@Override
public FileParseResult parseFile(CharStream input, int currentPass, int thread) {