Evening everyone, On 06/11/11 17:22, Terence Parr wrote: > Hi, Sam Harwell and I are talking about the file extension for new ANTLR 4. > We think it makes good sense to use .g4 to distinguish the new grammars. > They're mostly compatible except that there is no need for syntactic > predicates and .g4 allows immediate left recursion. I think it will reduce > confusion about what version of ANTLR is necessary to compile a grammar.
I'm pretty new to this ANTLR stuff, and to compilers/translators in general, so be gentle with me. ;-) Why does the file need to have a specific extension at all? I only just found out recently that Java classes have to live in a file with the same name as the class. Why? I can write a C++ class called Barney in a file called fred.cpp or fred.cxx or fred.c or fred if I like, the compiler and/or make seem quite happy with that. Maybe there is a good reason, Java perhaps? But I fell over at the first hurdle trying out the examples in the two books, I decided I didn't like a rule called 'r' and a grammar called 'g' and renamed everything, then saved in a filename of my choice. Boy did ANTLRWorks whinge at that - so I get my telling off, and had to rename the file. After that, fine. But I just don't see why it absolutely must be named like this? Having said that, if *.g4 is required for version 4, then I can live with it - I'd like the system to be extension agnostic though - but I'm only a tiny little non-essential cog, so I'm happy to be overruled. Thanks, however, for the ANTLR and ANTLRWorks system. I think I like it much better than Flex/Bison. Can you mention those on this list? ;-) Cheers, Norm. -- Norman Dunbar Dunbar IT Consultants Ltd Registered address: Thorpe House 61 Richardshaw Lane Pudsey West Yorkshire United Kingdom LS28 7EL Company Number: 05132767 List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address -- You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en.
