public static void loadFrom(ANTLRReaderStream input, Proto target) throws Exception
    {
        // Create an ExprLexer that feeds from that stream
        ProtoLexer lexer = new ProtoLexer(input);
        // Create a stream of tokens fed by the lexer
        CommonTokenStream tokens = new CommonTokenStream(lexer);
        // Create a parser that feeds off the token stream
        ProtoParser parser = new ProtoParser(tokens);
        // Begin parsing at rule parse
        parser.parse(target);
    }
Loads the proto from an {@link ANTLRReaderStream}.
protostuff-parser/src/main/java/io/protostuff/parser/ProtoUtil.java