From 5a3fb8cd4b7f99c7ac631c14fbb5282227bf8523 Mon Sep 17 00:00:00 2001 From: Matthias Andreas Benkard Date: Thu, 31 Jul 2008 19:58:00 +0200 Subject: Reimplement SYS::QUASIQUOTE. BLOCK and RETURN-FROM now seem to macroexpand properly. --- util.lisp | 40 ++++++++++++++++++++++++++++++++-------- 1 file changed, 32 insertions(+), 8 deletions(-) (limited to 'util.lisp') diff --git a/util.lisp b/util.lisp index a30cd48..62d9e79 100644 --- a/util.lisp +++ b/util.lisp @@ -158,19 +158,43 @@ (%defun append lists (%append lists)) -(%defmacro* sys::quasiquote (object) +(%defun* %zerop (integer) + (send-by-name integer "isEqual:" 0)) + +(%defun* %= (int1 int2) + (send-by-name int1 "isEqual:" int2)) + +(%defun* %1- (integer) + (add integer -1)) + +(%defun* %1+ (integer) + (add integer 1)) + +(%defun* qq-expand (object level) (if (not (consp object)) (list 'quote object) - (cond ((eq 'sys::unquote (car object)) (car (cdr object))) - ((eq 'sys::quasiquote (car object)) (list 'quote object)) + (cond ((eq 'sys::unquote (car object)) + (if (%= level 1) + (car (cdr object)) + (list 'sys::unquote (qq-expand (car (cdr object)) (%1- level))))) + ((eq 'sys::quasiquote (car object)) + (if (%zerop level) + (qq-expand (car (cdr object)) (%1+ level)) + (list 'sys::quasiquote (qq-expand (car (cdr object)) (%1+ level))))) ((and (consp (car object)) (eq 'sys::unquote-splicing (car (car object)))) - (list 'append - (car (cdr (car object))) - (list 'sys::quasiquote (cdr object)))) + (if (%= level 1) + (list 'append + (car (cdr (car object))) + (qq-expand (cdr object) level)) + (list 'sys::unquote-splicing (qq-expand (car (cdr object)) + (%1- level))))) (t (list 'cons - (list 'sys::quasiquote (car object)) - (list 'sys::quasiquote (cdr object))))))) + (qq-expand (car object) level) + (qq-expand (cdr object) level)))))) + +(%defmacro sys::quasiquote form-and-env + (qq-expand (car form-and-env) 0)) (%defun* %member (item list) (and list -- cgit v1.2.3