On Wed, 12 Oct 2005 09:54:55 +1100, Igor Plekhov <penguin@ocean.vvo.ru> wrote:
Here are similar problems: http://groups.google.com/group/linux.debian.bugs.dist/browse_thread/thread/da096a2268700b57/87d0b29b4fe81ee%2387d0b29b4fe81ee?sa=X&oi=groupsr&start=1&num=3
Thanks.
In that case will CL-PPCRE ever compile regular expression (at evaluation time for example)? If it will, at which time?
CL-PPCRE will always compile regular expressions. The question is whether it'll do it once or each time SCAN is invoked. It can pre-compile the regular expression if it can figure out that the regular expression in question is constant. See the compiler macros in api.lisp and the definition of DEFINE-COMPILER-MACRO in the CLHS.
Will it, if I change defparameter to defconstant?
Maybe. I think that depends on the interplay between backquote and constants in each Lisp implementation (CMUCL, in your case). See CONSTANTP in the CLHS. Cheers, Edi.