+ #+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 ((is-sep (char) (member char whitespace :test #'char=)))
+ (let ((tokens nil))
+ (do* ((token-start
+ (position-if-not #'is-sep string)
+ (when token-end
+ (position-if-not #'is-sep string :start (1+ token-end))))
+ (token-end
+ (when token-start
+ (position-if #'is-sep string :start token-start))
+ (when token-start
+ (position-if #'is-sep 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"
+ (declare (simple-string string)
+ (optimize (speed 3) (safety 0)))
+ (flet ((is-sep (char)
+ (declare (character char))
+ (and (non-alphanumericp char)
+ (not (char= #\_ char)))))
+ (let ((tokens nil))
+ (do* ((token-start
+ (position-if-not #'is-sep string)
+ (when token-end
+ (position-if-not #'is-sep string :start (1+ token-end))))
+ (token-end
+ (when token-start
+ (position-if #'is-sep string :start token-start))
+ (when token-start
+ (position-if #'is-sep string :start token-start))))
+ ((null token-start) (nreverse tokens))
+ (push (subseq string token-start token-end) tokens)))))
+
+
+(defun trim-non-alphanumeric (word)
+ "Strip non-alphanumeric characters from beginning and end of a word."
+ (declare (simple-string word)
+ (optimize (speed 3) (safety 0) (space 0)))
+ (let* ((start 0)
+ (len (length word))
+ (end len))
+ (declare (fixnum start end len))
+ (do ((done nil))
+ ((or done (= start end)))
+ (if (alphanumericp (schar word start))
+ (setq done t)
+ (incf start)))
+ (when (> end start)
+ (do ((done nil))
+ ((or done (= start end)))
+ (if (alphanumericp (schar word (1- end)))
+ (setq done t)
+ (decf end))))
+ (if (or (plusp start) (/= len end))
+ (subseq word start end)
+ word)))
+
+
+(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))))))
+
+(defun safely-read-from-string (str &rest read-from-string-args)
+ "Read an expression from the string STR, with *READ-EVAL* set
+to NIL. Any unsafe expressions will be replaced by NIL in the
+resulting S-Expression."
+ (let ((*read-eval* nil))
+ (ignore-errors (apply 'read-from-string str read-from-string-args))))
+
+(defun parse-float (f)
+ (let ((*read-default-float-format* 'double-float))
+ (coerce (safely-read-from-string f) 'double-float)))