+(defun collapse-whitespace (s)
+ "Convert multiple whitespace characters to a single space character."
+ (declare (simple-string s)
+ (optimize (speed 3) (safety 0)))
+ (with-output-to-string (stream)
+ (do ((pos 0 (1+ pos))
+ (in-white nil)
+ (len (length s)))
+ ((= pos len))
+ (declare (fixnum pos len))
+ (let ((c (schar s pos)))
+ (declare (character c))
+ (cond
+ ((kl:is-char-whitespace c)
+ (unless in-white
+ (write-char #\space stream))
+ (setq in-white t))
+ (t
+ (setq in-white nil)
+ (write-char c stream)))))))
+
+(defun string->list (string)
+ (let ((eof (list nil)))
+ (with-input-from-string (stream string)
+ (do ((x (read stream nil eof) (read stream nil eof))
+ (l nil (cons x l)))
+ ((eq x eof) (nreverse l))))))