[antlr-interest] Re: C directive as a comment

[m_barreteau]

--- In antlr-interest at yahoogroups.com, Monty Zukowski <monty at c...> 
wrote:
> Sure, you can build something with ANTLR to do that.  A good 
starting 
> place would be my C grammar, see the link below.  You would have to 
> change the lexer to pass the comment into the parser and from 
there, in 

 I changed it into:

KEYWORD : "_KEYWORD";

MY_DIRECTIVE                       
 }
        :       "/*" KEYWORD 
                (~( '*'| '\r' | '\n' ))+  
                                        { _ttype = MyParms; }
// Is it the way to pass the content of the comment (I mean without 
prefix "/*  _KEYWORD" and suffix "*/") back to the parser? I don't 
think so.
                "*/"           
        ;

protected
MyParms:;

Comment
        :       "/*" 
                ( { LA(2) != '/' }? '*'
                | { LA(2) != 'K' && LA(3) != 'E'}? '_'
// Is there another way to consider a keyword whose length > k (k=3 
in your file)? Such comments (without the keyword) have to be ignored 
as usual.
                | "\r\n"                { deferredNewline(); }
                | ( '\r' | '\n' )       { deferredNewline();    }
                | ~( '*'| '\r' | '\n' )
                )*
                "*/"                    { _ttype = Token.SKIP;  
                                        }
        ;

 I also have some troubles about spaces even if using 'ignore' in the 
options part to parse for instance "/*   _KEYWORD A [2:4] [1:5]  */". 
How can I manage with that at the lexer level?

> an action, send the contents of the comment to another lexer/parser 
to 

I suppose that this action is something like: 
{ ## = #( #[NKeyword], ##); } but has the related rule to be 
detailed? (see next question)

> grab what you need.

 Is this other lexer/parser in charge of detailing the content of the 
directive? (e.g. ID (LBRACKET e1:primaryExpr COLON e2:primaryExpr  
RBRACKET)+)

 Many thanks.

> Monty Zukowski
> 
> ANTLR & Java Consultant -- http://www.codetransform.com
> ANSI C/GCC transformation toolkit -- 
> http://www.codetransform.com/gcc.html
> Embrace the Decay -- http://www.codetransform.com/EmbraceDecay.html
> 
> 
> On Sep 13, 2004, at 8:54 AM, m_barreteau wrote:
> 
> >
> >  Hi!
> >
> >  I would like to recognise a directive (I mean an instruction that
> > can be ignored by a C compiler if a given identifier is not set) 
that
> > would be hidden inside a C comment. For instance:
> >
> > /* KEYWORD [parm1:parm2] */
> >
> >  Does ANTLR 2.7.2 is able to collect these parameters ?
> >
> >  Thanks.
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >





 
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