[antlr-interest] .g vs .g4

[Terence Parr]

Hi Eric,I think we are going to allow .g as well.   Rather than a property in the grammar file itself that identifies the version, I think we were going to use the file extension for this reason. all v3 grammars will be .g and people building v4 grammar should name them .g4
Ter
On Nov 6, 2011, at 9:29 AM, Eric wrote:

> 
> 
> On Sun, Nov 6, 2011 at 12:22 PM, Terence Parr <parrt at cs.usfca.edu> 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.
> 
> Ter
> 
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>  
>  
> Hi Ter,
>  
> Will v4 require the file type to be .g4, or will it accept .g and .g4?
>  
> My preference is for .g4 only.
>  
> Also, will there be a property in the grammar file that identifies the minimum version or required version. I think it would help for obvious reasons such as when a user post a grammar needing help or an example grammar is given.
>  
> Thanks, Eric
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>