At 09:38 PM 8/4/00 +0200, Jean-Louis Leroy wrote:
>Dan Sugalski <[EMAIL PROTECTED]> writes:
>
> > This does complicate the job of the parser/lexer rather
> > considerably.
>
>Why? Isn't it 'just' a matter or making the lexer read from a
>hot-redirectable input stream?
If it is, then it's not that big a deal, nor would it be all that useful.
Wiht substitutions it's more than that, and if we're going to do this, we
ought *not* essentially duplicate C's #define stuff. Macros mean the parser
needs to keep source around, possibly snapshot its current state and then
do an on-the-fly rework of the input buffers. (Maybe. Depends on what this
does)
The cleverer the preprocessor, the more work the lexer/parser needs to do.
Which is dandy but, as I said, if you're going to do it, do it once and do
it with some force.
Dan
--------------------------------------"it's like this"-------------------
Dan Sugalski even samurai
[EMAIL PROTECTED] have teddy bears and even
teddy bears get drunk
