It happens in the token function in gram.c:
   c = SkipSpace();
   if (c == '#') c = SkipComment();
and then SkipComment goes like that:
static int SkipComment(void)
{
   int c;
   while ((c = xxgetc()) != '\n' && c != R_EOF) ;
   if (c == R_EOF) EndOfFile = 2;
   return c;
}
which effectively drops comments.
Would it be possible to keep the information somewhere ?
The source code says this:
 * The function yylex() scans the input, breaking it into
 * tokens which are then passed to the parser. The lexical
 * analyser maintains a symbol table (in a very messy fashion).
so my question is could we use this symbol table to keep track of, say, COMMENT
tokens.
Why would I even care about that ? I'm writing a package that will
perform syntax highlighting of R source code based on the output of the
parser, and it seems a waste to drop the comments.
An also, when you print a function to the R console, you don't get the
comments, and some of them might be useful to the user.
Am I mad if I contemplate looking into this ?
Romain
--
Romain Francois
Independent R Consultant
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
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