[antlr-interest] Return values for fragment lexer rules

[Christian]

Ok, I solved it by myself.
Although lexer rules cannot return values, they do can have parameters.
Thus, I create a wrapper object that holds the return value and pass it
to the lexer rule. This kind of parameter passing is used in Pascal
(var) or C++ (out), for example.

Regards,
Christian

Am 14.01.2012 14:23, schrieb Christian:
> I now use an extended version of CommonToken that additionally contains
> a member result. In this way, I can save the result of a Token. However,
> I have to set it somehow. How can I access the current token within
> action code? I would like to have something like the following:
>
> fragment Pp_expression
>   : WHITESPACE? expr=Pp_or_expression WHITESPACE?
>     {$this.result = $expr.result;}
>   ;
>
> Regards,
> Christian
>
> Am 13.01.2012 12:38, schrieb Christian:
>> Hello community,
>>
>> is it right that even fragment lexer rules cannot return any value? The
>> CommonToken does not provide any access to such a value.
>>
>> Regards,
>> Christian
>>
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