[antlr-interest] antlrworks 3.0ea8 unreachable error

[Martin d'Anjou]

On Mon, 20 Mar 2006, O.E. Dragon wrote:
> On Mon, 20 Mar 2006 18:05:26 -0500 (EST)
> "Martin d'Anjou" <mdanjou at neterion.com> wrote:
>> The following highly simplified grammar:
>>
>> grammar mygrammar;
>> def	:	ID;
>> ID	:	LETTER;
>> LETTER	:	'a';
>>
>> Gives me this error in antlrworks:
>>   "The following token definitions are unreachable: LETTER"
>>
>> When I change "ID" to lower case "id", it works...
>> Am I missing something?
>
> By convention, grammar rule that start with a lower case letter are
> expected to be parser rules, and those starting with an upper case
> letter are lexer rules.
>
> I don't know how ANTLR v3 works but in v2 you need to put parser rules
> in a separate grammar section.

I have looked at the examples for v3, but I don't find how to create a 
seperate section for lexer rules. The closest is the ruby.g file, where it 
has the GVAR token defined in terms of ID, but I don't see what it is that 
explicitely seperates the grammar and the lexer.

Martin