+(defun string-strip-ending (str endings)
+ (if (stringp endings)
+ (setq endings (list endings)))
+ (let ((len (length str)))
+ (dolist (ending endings str)
+ (when (and (>= len (length ending))
+ (string-equal ending
+ (subseq str (- len
+ (length ending)))))
+ (return-from string-strip-ending
+ (subseq str 0 (- len (length ending))))))))
+
+
+(defun string-maybe-shorten (str maxlen)
+ (let ((len (length str)))
+ (if (<= len maxlen)
+ str
+ (concatenate 'string (subseq str 0 (- maxlen 3)) "..."))))
+
+
+(defun shrink-vector (str size)
+ #+allegro
+ (excl::.primcall 'sys::shrink-svector str size)
+ #+cmu
+ (lisp::shrink-vector str size)
+ #+lispworks
+ (system::shrink-vector$vector str size)
+ #+sbcl
+ (sb-kernel:shrink-vector str size)
+ #+scl
+ (common-lisp::shrink-vector str size)
+ #-(or allegro cmu lispworks sbcl scl)
+ (setq str (subseq str 0 size))
+ str)
+
+(defun lex-string (string &key (whitespace '(#\space #\newline)))
+ "Separates a string at whitespace and returns a list of strings"
+ (flet ((whitespace? (char) (member char whitespace :test #'char=)))
+ (let ((tokens nil))
+ (do* ((token-start
+ (position-if-not #'whitespace? string)
+ (when token-end
+ (position-if-not #'whitespace? string :start (1+ token-end))))
+ (token-end
+ (when token-start
+ (position-if #'whitespace? string :start token-start))
+ (when token-start
+ (position-if #'whitespace? string :start token-start))))
+ ((null token-start) (nreverse tokens))
+ (push (subseq string token-start token-end) tokens)))))
+
+(defun split-alphanumeric-string (string)
+ "Separates a string at any non-alphanumeric chararacter"
+ (flet ((whitespace? (char) (non-alphanumericp char)))
+ (let ((tokens nil))
+ (do* ((token-start
+ (position-if-not #'whitespace? string)
+ (when token-end
+ (position-if-not #'whitespace? string :start (1+ token-end))))
+ (token-end
+ (when token-start
+ (position-if #'whitespace? string :start token-start))
+ (when token-start
+ (position-if #'whitespace? string :start token-start))))
+ ((null token-start) (nreverse tokens))
+ (push (subseq string token-start token-end) tokens)))))
+
+