[antlr-interest] v3: using literals

[Terence Parr]

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