[antlr-interest] a crazy problem cost me almost two days ---how can i get the return value from antlr?

[Jared Bunting]

In addition to compiling, after renaming "input" your grammar seems to 
work just fine.  Using output=AST, t had a value for every input that I 
through at it. 

-Jared

Ivar Refsdal wrote:
> Hi,
>
> I noticed one thing:
>
> You are using the name "input" as the return value.
> It looks like this variable is reserved.
> The .g to .java compiler should complain about this in my opinion.
>
> Here the .g compiles to .java, but the .java does not compile.
> If you rename the return variable name, the .java compiles also.
>
>
> If you look at the code:
>
>     public final String base1() throws RecognitionException {
>         String input = null;
> ...
>             switch ( input.LA(1) ) {
> ...
> So that's probably it...
>
> This compiles fine:
> base1   returns[String input2]
>         :
> b64=Base64Block{$input2=$b64.getText();}|ident=Id{$input2=$ident.getText();}|n
> = Num  {$input2 = $n.getText();}
>         ;
> id1   returns[String input2]
>       :ident=Id{$input2=$ident.getText();}
> |b64=Base64Block{$input2=$b64.getText();}|n = Num  {$input2 = $n.getText();}
>       ;
>
>
> Good luck,
> Ivar
>
>
>
> Terence Parr wrote:
>   
>> On Nov 23, 2008, at 7:47 PM, Su Zhang wrote:
>>
>>   
>>     
>>> Hi all,
>>>
>>> I wrote a returns [String s] in my rules in order to get a return  
>>> value, but when I call the function generated by the exact rule in  
>>> the main function, there is not any return value, and the type of  
>>> return value is not a String, and the value includes a tree  
>>> structure,etc, but I define it as a string in the antlrworks, does  
>>> anybody know what's the problem in my project? how can i get the  
>>> return String I defined? I am almost crazy about this annoying  
>>> problem,
>>> here is a part of my grammar:
>>>
>>>     
>>>       
>> hi. have you looked at the generated code?  It should have a t in the  
>> object returned from that rule.
>>
>> Ter
>>
>>
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