[antlr-interest] v3: using literals
Terence Parr
parrt at cs.usfca.edu
Sun Mar 5 09:42:32 PST 2006
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
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