[antlr-interest] v3: using literals

[Terence Parr]

your primitiveType is optional (empty alt) and presumably there is a  
loop above typeSpec.  That can be the only possibility...what can  
follow typeSpec?
Ter
On Mar 7, 2006, at 10:09 AM, Dieter Frej wrote:

> Thanks Ter! Is there any way I can get rid of this ambiguity?
> ... or anyone else besides Ter? ;-)
>
> - Didi
>
>
>
> Terence Parr wrote:
>> Hi. The grammar you have is fine minus the ambiguity.  You don't  
>> need  to do that testLiterals stuff with v3.  It just works.
>> Ter
>> On Mar 5, 2006, at 7:44 AM, Dieter Frej wrote:
>>> Hi,
>>>
>>> since antlrworks is a nice program I started using it (in my  
>>> case  it does not matter whether I use antlr v2 or v3).
>>>
>>> I have something pretty easy such as
>>>
>>> typeSpec
>>>     :
>>>     (classOrInterfaceType | primitiveType)
>>>     ;
>>>     primitiveType
>>>     :    //
>>>     |    'boolean'
>>>     |    'byte'
>>>     |    'char'
>>>     |    'short'
>>>     |    'int'
>>>     |    'float'
>>>     |    'long'
>>>     |    'double'
>>>     ;
>>>
>>> classOrInterfaceType
>>>     :    //
>>>         IDENT
>>>     ;
>>>
>>> IDENT
>>>     :    ('a'..'z'|'A'..'Z'|'_'|'$')  
>>> ('a'..'z'|'A'..'Z'|'_'|'0'..'9'|'$')*
>>>     ;
>>>
>>> I am getting a
>>>
>>> [16:32:58] test.g:47:9: Decision can match input such as "IDENT"  
>>> using
>>> multiple alternatives: 1, 2
>>> As a result, alternative(s) 2 were disabled for that input
>>>
>>> which I completly understand. The problem is that I do not know  
>>> how to
>>> use and test for literals in antlr v3. I did put
>>>
>>> grammar test;
>>> options {
>>>     output = AST;
>>> }
>>> tokens {
>>>     LITERAL_boolean='boolean';
>>>     LITERAL_byte='byte';
>>>     LITERAL_char='char';
>>>     LITERAL_short='short';
>>>     LITERAL_int='int';
>>>     LITERAL_float='float';
>>>     LITERAL_long='long';
>>>     LITERAL_double='double';
>>> }
>>>
>>> in my grammar, but when I put testLiterals=true under options,  
>>> it  keeps
>>> complaining. I searched for it on the web page, but nothing :-/  
>>> Not  even
>>> in the java example grammar that is on the v3 page.
>>>
>>> Any hints/suggestions how I could do that in v3? Or is v3 not  
>>> yet  ready
>>> for that?
>>> If so: is there any other nice visual development tool for antlr v2?
>>>
>>> Didi
>