[antlr-interest] change token type?

[Kevin J. Cummings]

On 07/31/2009 07:31 PM, Kendall Shaw wrote:
> Here's my non-working toy grammar:
> 
> grammar test;
> 
> tokens {
>     CAT = 'cat' ;
>     LP = '(' ;
>     RP = ')' ;
> }
> 
> them
>     : (cat)=> cat
>     | NAME
>     ;

Have you tried:

them : (CAT LP)=> cat
     | name;

name : NAME
     | CAT;

> cat : CAT LP RP ;
> 
> NAME : 'a'..'z'+ ;
> 
> The lexer insists that "cat" is a CAT instead of a NAME. In the real
> grammar, all keywords can also be identifiers. How can this be done?
> None of the examples I've seen so far really fit this case.
> 
> I tried:
> 
> cat : c:CAT {if(!input.LT(1).getText().equals("[")) c.setType(NAME);} LP RP ;
> 
> but that doesn't seem to work.
> 
> 
> 
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-- 
Kevin J. Cummings
kjchome at rcn.com
cummings at kjchome.homeip.net
cummings at kjc386.framingham.ma.us
Registered Linux User #1232 (http://counter.li.org)