[antlr-interest] retaining comments

[Bogdan Mitu]

Hi ram,

It's usually a good idea to read the documentation first ;-)

See http://www.antlr.org/fieldguide/whitespace/index.html

Cheers,
Bogdan

--- Sriram Durbha <cintyram at yahoo.com> wrote:
> hi,
>  im writing a translator from  language A to language B ;
> most of the statements in A which when written are finished within one
> line and are optionally followed but a comment can be translated as is
> to the target ; eg: 
> int a,b,c ;// comment         <===>  a,b,c : INTEGER ; # comment
> 
>  but for mor ethan one line , retaining comments has become an issue
>  
> eg: 
>  int a, // comment a
>      b,
>      c  ;// comment c
> 
> since a comment can in principle appear any where;
> eg:
> 
>  int a //
>      , //
>      b //
>      , //
> for the other productions which are more complex, it appears like
> 
> 
> rule : ( CMNT)? sub_1 ( CMNT)? sub_2 (CMNT)?  
> 
> hope you get the picture..  so i decided to write my own parser and
> process the source line by line ;
> 
> bu tnow it looks like i have to use a tool the code is already a few
> hundred lines and does a beautiful job of translating but after two
> days when i look at the code i find it difficult to go thru . so i cant
> deliver it to the client !!! 
> 
> and now im considering using antlr again.. but ho9w and wehre do i get
> to an example which can show how to retian comments?
> 
> since the retaining comments problem is with yacc also, but antlr
> offers some cool features.. i opt antlr.. but now im stuck !!
> 
> any pointers or links to examples showing how to retain comments will
> be appreciated.. mean while im trying to understand what hidden token
> streams are all about;
> 
> thanks
> ram
> 
> 
> 
> 
> 
> 
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