At 13:25 23/11/2008, Su Zhang wrote:
>thank you for your reply, yet i still have some problems, why
the
>return rule timeTuple cannot be regarded as a string? just part
of
>my grammar below, and with error information
>
>validity returns [String v]
> : ValidityHeader NotBefore tb= timeTuple NotAfter ta=
timeTuple
> ValidityEnd { $v= $tb.getText() + $ta.getText(); }
> ;
>timeTuple returns [String time]
> : 'datime' '('t1= num ','t2= num ','t3= num ','t4= num ','
> t5= num ','t6= num ')' '.'
> {//time= new timeTuple(t1, t2, t3, t4, t5 ,t6);
> $time = "datime" + '(' + t1 + ','+ t2 +','+ t3 +',' +
t4+','
> + t5+',' +t6 + ')';
> }
> ;
>error information: unknown attribute for rule timeTuple: getText
[...]
>even it won't work if I change $v= $tb.getText() +
>$ta.getText();
>into $v=$tb+$ta;, it will show
>
>missing attribute access on rule scope: tb
>missing attribute access on rule scope: ta
As I mentioned before, the correct syntax would be $tb.text, not
$tb or $tb.getText().
$x.y is the ANTLR syntax for getting (or setting) the attribute y
from label x. Different target languages (and different versions
of ANTLR, and in different contexts) resolve this into different
bits of target language code, but the syntax in the grammar is
uniform for convenience.
It's discussed in detail in the ANTLR book, and in passing (but
sufficiently) in the Wiki.
(And remember to use Reply All to direct responses to the group as
well. You can get better results that way.)
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