[antlr-interest] Change type of current AST

[Dimitrios Kolovos]

Unfortunately this doesn't work as it generates

if ( state.backtracking==0 ) {
  ((Token)((CommonTree)retval.tree).payload).setType(Operator);
}

which doesn't compile as CommonTree doesn't have a payload field...

Cheers,
Dimitrios

On Fri, Jun 6, 2008 at 10:46 PM, Terence Parr <parrt at cs.usfca.edu> wrote:
> Oh, right.  ((Token)$tree.payload).setType(Operator) would do it.
> Ter
> On Jun 6, 2008, at 2:37 PM, Dimitrios Kolovos wrote:
>
>> If I set ASTLabelType=CommonType, $tree.type = Operator; it generates
>>
>> if ( state.backtracking==0 ) {
>>  ((CommonTree)retval.tree).type = Operator;
>> }
>>
>> which is incorrect as CommonTree doesn't have a "type" field
>>
>> (without an ASTLabelType = it generates
>>
>> if ( state.backtracking==0 ) {
>>  ((Object)retval.tree).type = Operator;
>> }
>>
>> which is also (profoundly) incorrect
>> )
>>
>> Cheers,
>> Dimitrios
>>
>> Terence Parr wrote:
>>>
>>> Oh, well $tree.type = foo; is what you want.
>>> Ter
>>> On Jun 6, 2008, at 1:50 PM, Dimitrios Kolovos wrote:
>>>
>>>> Thanks for your prompt reply. It seems we are getting closer (but still
>>>> no cigar :)
>>>>
>>>> both $tree = and $additiveExpression.tree = produce
>>>>
>>>> if ( state.backtracking==0 ) {
>>>>  retval.tree = Operator;
>>>> }
>>>>
>>>> which does not seem to change the type of the AST (the getType() returns
>>>> the value of a generated field named T_97). Everything else in the grammar
>>>> seems to be working fine (no warnings, expected ASTs).
>>>>
>>>> Cheers,
>>>> Dimitrios
>>>>
>>>>
>>>> Terence Parr wrote:
>>>>>
>>>>> Try $tree = or $additiveExpression.tree =  I believe.No doubt you are
>>>>> getting an error from antlr below?
>>>>> Ter
>>>>> On Jun 6, 2008, at 1:17 PM, Dimitrios Kolovos wrote:
>>>>>
>>>>>> Hi Ter,
>>>>>>
>>>>>> Unfortunately, that doesn't seem to work either.
>>>>>>
>>>>>> additiveExpression
>>>>>> :    multiplicativeExpression (('+'|'-')^ multiplicativeExpression
>>>>>> {$additiveExpression.setType(Operator);})*
>>>>>> ;
>>>>>>
>>>>>> in the parser grammar produces
>>>>>>
>>>>>> if ( state.backtracking==0 ) {
>>>>>> $additiveExpression.setType(Operator);
>>>>>> }
>>>>>>
>>>>>> in the parser class.
>>>>>>
>>>>>> (I'm using 3.1b in case this makes a difference.)
>>>>>>
>>>>>> Cheers,
>>>>>> Dimitrios
>>>>>>
>>>>>> Terence Parr wrote:
>>>>>>>
>>>>>>> Use $ not #
>>>>>>> On Jun 6, 2008, at 6:27 AM, Dimitrios Kolovos wrote:
>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> In ANTLR2 I was able to change the type of the current AST like
>>>>>>>> this:
>>>>>>>>
>>>>>>>> additiveExpression
>>>>>>>> :    multiplicativeExpression ((PLUS^|MINUS^)
>>>>>>>> multiplicativeExpression {#additiveExpression.setType(OPERATOR);})*
>>>>>>>> ;
>>>>>>>>
>>>>>>>> but I haven't been able to find how to do the same in v3. Any hints?
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>> Dimitrios
>>>>>>>
>>>>>>>
>>>>>
>>>>>
>>>
>>>
>
>