I earlier said:
> I've been experimenting with various possible syntaxes for <*...*> in the
> ANTLR grammar, here are my current thoughts (I'd like some feedback).
Just after posting, I found a more flexible approach. After <* ("RESTART"), we
can still use the "head" production, but make it optional. You can close it
using *> on the same line, or not, and we can use that as the trigger. This
keeps the weirdness of the restart_list BNF isolated inside the restart
productions, which is MUCH better. Something like this:
restart_list : RESTART hspace* (head | empty)
( RESTART_END
| /*= (push_indent "") */
comment_eol+
(restart_contents
| empty ))
RESTART_END /*= (restore_indent) */ hspace* ;
So that way you can do:
let <* x cos(0) *>
You can also do:
define-library ... <* begin
define x {2 * x}
define y {2 * y}
*>
--- David A. Wheeler
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