Am 17.11.2011 02:39:05 schrieb(en) John B. Brodie:
> On 11/16/2011 12:02 AM, Voelkel, Andy wrote:
> >
:
:
:
> > array
> > : ( l='[' (f+=FLOAT)+ ']' -> ^(ARRAY_FLOAT ["FLT ARY",$l] $f+) )
> > | ( l='[' (s+=STRING)+ ']' -> ^(ARRAY_STRING["STR ARY",$l] $s+) )
> > ;
> >
> > [Andy - This causes compiler errors, and I'm really not sure what you are
> getting at.
>
> compiler errors are odd here, maybe the C# target does not support the [
> ] notation for initializing an imaginary token?
To be specific on this example only: I believe the order of the parameters (in
[]) in the rewrite section is wrong. First comes the token reference then
follows the text for the imaginary node.
array
: ( l='[' (f+=FLOAT)+ ']' -> ^(ARRAY_FLOAT [$l,"FLT ARY"] $f+) )
| ( l='[' (s+=STRING)+ ']' -> ^(ARRAY_STRING[$l,"STR ARY"] $s+) )
;
See Chapter 7, p. 176 "Deriving Imaginary Nodes from Real Tokens" in the
ANTLR Reference Book (print 02).
>
> > i think this last form will simplify subsequent processing of the tree.
> > note also the proper initialization of the imaginary tokens.
> >
> > [Andy - what do you mean "proper initialization of the imaginary tokens"]
>
> the stuff between the [ ] on the right hand side of the -> is
> information used to initialize the imaginary token. in Java, they get
> translated into parameters to its constructor. i refer you to Dr. Parr's
> book to find out more about this feature.
Regards,
Stefan
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