[Sdl-developers] ABNF Grammar

[E M]

David,
   
  You are right. I was looking at the wrong Java grammar. Also, the C grammar predates what we would consider reasonably fast machines by a few decades. At the time it would have made more sense to "optimize" the comment handling out of the grammar, and use lexer tricks. This might not be an option for SDL's grammar, especially if the Java comment grammar works as advertised.
   
  Eric

"J. David Beutel" <jdb at getsu.com> wrote:
  Java defines two separate grammars: lexical and syntactic. The comments 
are in the lexical grammar, along with Unicode escapes and whitespace. 
It's applied separately, before the syntactic grammar.

http://java.sun.com/docs/books/jls/third_edition/html/grammars.html#151185

I guess this follows the tradition of Lex and Yacc, and many languages 
do it the same way. I would have assumed that the distinction was for 
performance reasons, but since performance is so much better nowadays, I 
guess it also makes it easier to understand.

So I wouldn't worry about unifying it for SDL.

Cheers,
11011011

"Jesse Weaver" 
wrote on Monday, January 08, 2007 
08:06:27:
> I guess it'll have to be. Thanks for the advice, all.
>
> On 1/8/07, *Daniel Leuck* > wrote:
>
> Hi Eric,
>
> 
>
> Thank you for the feedback. Jesse - perhaps your comment above
> the definition noting that multi-line comments are not covered is
> sufficient.
>
>
>
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