[antlr-interest] tricky (to this newby) translation problem

[Kenny Tilton]

[resending to list....]

Terence Parr wrote:

>
> On Dec 30, 2005, at 8:31 AM, Kenny Tilton wrote:
>
>>   enumerator
>>        :       i:ID            { print( i ); }
>>                ( b:ASSIGN      { print( b ); }
>>                  expr
>>                )?
>>        ;
>>
>> But my problem is that, if the match with an ASSIGN happens, I need  
>> to get a left-parens /in front/ of the emitted ID. Otherwise I have  
>> to always wrap enumerators in parens:
>
>
> Hi.  First let me suggest using StringTemplate in combination with  
> ANTLR:
>
> http://www.codegeneration.net/tiki-read_article.php?articleId=77

Actually I did look at that first because it sounded perfect, but that
article was greek to me so I looked for something I could grok without
learning about parsing. I know that sounds strange and that by the time
I am done I will have learned quite a bit, but I have a hard time
understanding doc. otoh, GnuCEmitter.g was on the face of it something I
could work from with a little guesswork.

The funny thing is that I just want to translate one old C app to Common
Lisp (CL) so I can resume development with my new preferred language. An
hour of hand translation was enough to send me looking for a translator.
Antlr looks brilliant, but I am also having to get up to speed on Java
and now parsing.

So believe it or not I am getting actual results without really having
learned anything yet! Full marks to the great examples, especially Cgram.

>
> As to your problem.  Try this
>
> enumerator
>        :       i:ID
>                ( b:ASSIGN      { print( i ); print( b ); }
>                  expr
>          |            { print( i ); } // empty grammatical production
>                )
>        ;
>
Diabolical. I like it. :)

Thx, kenny