public static TortoiseProgram Compile(string source)
    {
        AntlrInputStream  antlerStream = new AntlrInputStream(source);
        TortoiseLexer     lexer        = new TortoiseLexer(antlerStream);
        CommonTokenStream tokenStream  = new CommonTokenStream(lexer);
        TortoiseParser    parser       = new TortoiseParser(tokenStream);

        parser.prog();         // <-- compile actually happens here (see Assets/Grammars/Tortoise/Tortoise.g4

        TortoiseCompiler compiler = parser.Compiler;
        TortoiseProgram  program  = new TortoiseProgram(compiler.Commands);

        return(program);
    }
    public static TortoiseProgram Compile(string source)
    {
        AntlrInputStream antlerStream = new AntlrInputStream(source);
        TortoiseLexer lexer = new TortoiseLexer(antlerStream);
        CommonTokenStream tokenStream = new CommonTokenStream(lexer);
        TortoiseParser parser = new TortoiseParser(tokenStream);

        parser.prog(); // <-- compile actually happens here (see Assets/Grammars/Tortoise/Tortoise.g4

        TortoiseCompiler compiler = parser.Compiler;
        TortoiseProgram program = new TortoiseProgram(compiler.Commands);

        return program;
    }