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    <p>You asked for any advice, yet your question is strangely specific to Antlr 3.5. Do you have a requirement to use Antlr 3.5? It would help to know what you will be using the grammar for: simple syntax validation or a full-on interpreter?</p> <p>If you can consider using Antlr 4, you should. It handles left factored rules better than Antlr 3 and, since it appears that you are just learning Antlr, Antlr 4 IMO will be easier to pick up. If you really need an AST, then go with Antlr 3</p> <p>Unfortunately, an automated conversion tool would, at best, give you a bad starting point for developing your grammar.</p> <p>As to where/how to start, best advise would be to get a copy of the Java grammar (<a href="https://github.com/antlr/examples-v3" rel="nofollow">java.g</a> for Antlr 3.5 or <a href="https://github.com/antlr/grammars-v4" rel="nofollow">java.g4</a> for Antlr 4) to use as a working example -- Jess appears to sufficiently similar that the java grammar should give you a clear idea of how to proceed.</p>
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    1. POEBNF grammar to ANTLR3?
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    1. COI'm sorry, I should have specified. I am redefining the language to be more like C/C++, and in order to do so I would first need to be able to parse the original Jass language. Then, I will build a parser & lexer for my own language (based on C), place both parsers in the same C++ library, and then link that library to a console compiler application, capable of interpreting my language into the original Jass scripting language, invented by Blizzard Entertainment. Jass itself has A TON of room for improvement, and I wish to fill those gaps to my own liking.
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    2. COI would use Antlr 4, but I've read that now it is solely meant for development in Java... And I'd rather not have to go through the trouble of reinstalling eclipse just for the sole purpose of using Antlr. Antlr 3.5, on the other hand, has a built-in C generator and is the most current version used in ANTLRWorks 1.5, a tool that I'd rather not be without.
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    3. COPlease disregard my previous comment. As it turns out, they have recently developed ANTLRWorks2 ([link](http://tunnelvisionlabs.com/products/demo/antlrworks)), which uses ANTLR4. It still only targets the java development environment, but the site states that they are working on C++... So I guess I'll stay tuned for that, and meanwhile I suppose I could deal with using eclipse. Possibly even just create an interpreter, if I can make it that far.
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