[antlr-interest] How to use LT and LA in predicates?

[David Holroyd]

On Sat, Apr 21, 2007 at 12:53:43AM +0200, Johannes Luber wrote:
> in the beta book Terence wrote, that one has to define the isTypeName()
> method in this rule somewhere else:
> 
> type_id
>    :  {isTypeName(input.LT(1).getText())}? ID
>    ;
> 
> Problem is, that LT seems to return only an integer after Eclipse syntax
> analyzer. So how do I get the text?

In the parser, 'input' is a TokenStream instance, which defines,

  LT(k) => Token

and (via IntStream, its superclass),

  LA(k) => int


Something must be mixed up?


ta,
dave

-- 
http://david.holroyd.me.uk/