[antlr-interest] Trying to implement a while loop using embedded actions in ANTLR

[Kevina Choolhun]

Thanks Adam ;)

I tried that just in case it could work.. I did not expect it to compile but
it did...

I hope to find a solution soon and should i be able to crack it up.. i will
post it here...

But any help is still welcomed. :)

Kevina


On Tue, Jun 3, 2008 at 1:58 PM, Adam Connelly <
adam.rpconnelly at googlemail.com> wrote:

> Not 100% on this, but it looks like you have a typo.
>
> 'while' c1 = cond
>             {$c1.value == true}?=>
>             {while !($c1.value==true)
>             {
>
>             evaluate=true;}
>                 stat+
>              }
>              'endwhile'
>
> Should be
>
> 'while' c1 = cond
>             {$c1.value == true}?=>
>             {while !($c1.value==true)
>             {
>
>             evaluate=true;}
>              }
>              stat+
>              'endwhile'
>
> Looks like the stat+ is inside the action.  I think I know what you're
> trying to say, but I doubt it will work like that.  I'm actually surprised
> it compiles, but then I'm not an ANTLR expert.  Sorry I can't think of a
> solution at the moment.
>
> Adam
>
> 2008/6/3 Kevina Choolhun <kevina.choolhun at gmail.com>:
>
>
>>
>> Hello everybody,
>>
>> I am new at antlr and have been trying my hand at embedding actions to try
>> make a while_loop work...
>>
>> Here is part of my code.
>>
>> whileStatement
>> @init{ evaluate = false;}
>> @after{evaluate=true;}
>>
>> :
>>         'while' c1 = cond
>>             {$c1.value == true}?=>
>>             {while !($c1.value==true)
>>             {
>>
>>             evaluate=true;}
>>                 stat+
>>              }
>>              'endwhile'
>>
>>
>>  It works fine apart from the
>> ("major") fact that it does not iterate, i.e. It enters the loop if
>> condition is true, process the actions inside the loop and exits, even if
>> condition is still true...
>>
>> I have run out of ideas.. well, i am new at antlr and may be missing an
>> important point somewhere.
>>
>> Can someone please counsel?
>>
>> Thank you for your help.
>>
>> Kevina
>
>
>
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