-(set-macro-character #\[
- #'(lambda (stream char)
- (declare (ignore char))
- (let ((forms '())
- (curr-string (new-string))
- (paren-level 0)
- (got-comma nil))
- (declare (type fixnum paren-level))
- (do ((ch (read-char stream t nil t) (read-char stream t nil t)))
- ((eql ch #\]))
- (if got-comma
- (if (eql ch #\()
- ;; Starting top-level ,(
- (progn
- #+cmu
- (setf curr-string (coerce curr-string `(simple-array character (*))))
-
- (push `(lml-princ ,curr-string) forms)
- (setq curr-string (new-string))
- (setq got-comma nil)
- (vector-push #\( curr-string)
- (do ((ch (read-char stream t nil t) (Read-char stream t nil t)))
- ((and (eql ch #\)) (zerop paren-level)))
- (when (eql ch #\])
- (format *trace-output* "Syntax error reading #\]")
- (return nil))
- (case ch
- (#\(
- (incf paren-level))
- (#\)
- (decf paren-level)))
- (vector-push-extend ch curr-string))
- (vector-push-extend #\) curr-string)
- (let ((eval-string (read-from-string curr-string))
- (res (gensym)))
- (push
- `(let ((,res ,eval-string))
- (when ,res
- (lml-princ ,res)))
- forms))
- (setq curr-string (new-string)))
- ;; read comma, then non #\( char
- (progn
- (unless (eql ch #\,)
- (setq got-comma nil))
- (vector-push-extend #\, curr-string) ;; push previous command
- (vector-push-extend ch curr-string)))
- ;; previous character is not a comma
- (if (eql ch #\,)
- (setq got-comma t)
- (progn
- (setq got-comma nil)
- (vector-push-extend ch curr-string)))))
-
- #+cmu
- (setf curr-string (coerce curr-string `(simple-array character (*))))
-
- (push `(lml-princ ,curr-string) forms)
- `(progn ,@(nreverse forms)))))