+
+
+(defmacro when-bind ((var expr) &body body)
+ `(let ((,var ,expr))
+ (when ,var
+ ,@body)))
+
+
+(defmacro assoc-ref (key alist &key (test #'eq))
+ `(cdr (assoc ,key ,alist :test ,test)))
+
+
+(defmacro assoc-lref (key alist &key (test #'eq))
+ `(cadr (assoc ,key ,alist :test ,test)))
+
+
+(defun assoc-rem (key alist &key (test #'eq))
+ (remove-if #'(lambda (element) (funcall test key (car element))) alist))
+
+
+(defun assoc-delete (key alist &key (test #'eq))
+ (delete-if #'(lambda (element) (funcall test key (car element))) alist))
+
+
+(defun funcallable (object)
+ (if (consp object)
+ (fdefinition object)
+ object))
+
+(defun intersection-p (list1 list2 &key (test #'eq))
+ (dolist (obj list1 nil)
+ (when (member obj list2 :test test)
+ (return-from intersection-p t))))
+
+
+(defun split-string (string delimiter)
+ (declare (simple-string string) (character delimiter))
+ (check-type string string)
+ (check-type delimiter character)
+ (let ((pos (position delimiter string)))
+ (if (not pos)
+ (list string)
+ (cons
+ (subseq string 0 pos)
+ (split-string (subseq string (1+ pos)) delimiter)))))
+
+(defun split-string-if (string predicate)
+ (declare (simple-string string))
+ (check-type string string)
+ (check-type predicate (or symbol function))
+ (let ((pos (position-if predicate string :start 1)))
+ (if (not pos)
+ (list string)
+ (cons
+ (subseq string 0 pos)
+ (split-string-if (subseq string pos) predicate)))))
+
+(defun concatenate-strings (strings &optional delimiter)
+ (if (not (rest strings))
+ (first strings)
+ (concatenate
+ 'string
+ (first strings)
+ (if delimiter (string delimiter) "")
+ (concatenate-strings (rest strings)))))
+
+(defun string-prefix-p (string1 string2)
+ (string= string1 string2 :end2 (length string1)))