diff options
Diffstat (limited to 'src/interp/sys-macros.lisp')
| -rw-r--r-- | src/interp/sys-macros.lisp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/interp/sys-macros.lisp b/src/interp/sys-macros.lisp index 3608e2ad..85f5434f 100644 --- a/src/interp/sys-macros.lisp +++ b/src/interp/sys-macros.lisp @@ -278,6 +278,24 @@ ((EQCAR A 'CDR) (LIST 'RPLACD (CADR A) B)) ((ERROR 'RPLAC)))))) +(defmacro |rplac| (&rest L) + (let (a b s) + (cond + ((EQCAR (SETQ A (CAR L)) 'ELT) + (COND ((AND (INTEGERP (SETQ B (CADDR A))) (>= B 0)) + (SETQ S "CA") + (do ((i 1 (1+ i))) ((> i b)) (SETQ S (STRCONC S "D"))) + (LIST 'RPLAC (LIST (INTERN (STRCONC S "R")) (CADR A)) (CADR L))) + ((ERROR "rplac")))) + ((PROGN + (SETQ A (CARCDREXPAND (CAR L) NIL)) + (SETQ B (CADR L)) + (COND + ((CDDR L) (ERROR 'RPLAC)) + ((EQCAR A 'CAR) (LIST 'RPLACA (CADR A) B)) + ((EQCAR A 'CDR) (LIST 'RPLACD (CADR A) B)) + ((ERROR 'RPLAC)))))))) + ;; ;; -*- Association Lists -*- ;; |