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(defun copy-tree (tree)
(typecase tree
(cons (cons (copy-tree (car cons)) (copy-tree (cdr cons))))
(t tree)))
(defun assoc (item alist &key key test test-not)
(setq test (or test (if test-not
(complement test-not)
(function eql))))
(assoc-if (lambda (x) (funcall test x item))
alist
:key key))
(defun assoc-if (predicate alist &key key)
(setq key (or key (function identity)))
(cond ((endp alist) nil)
((funcall predicate (funcall key (caar alist)))
(car alist))
(t (assoc-if predicate (cdr alist) :key key))))
(defun assoc-if-not (predicate alist &key key)
(assoc-if (complement predicate) alist :key key))
(defun rassoc (item alist &key key test test-not)
(setq test (or test (if test-not
(complement test-not)
(function eql))))
(rassoc-if (lambda (x) (funcall test x item))
alist
:key key))
(defun rassoc-if (predicate alist &key key)
(setq key (or key (function identity))
(cond ((endp alist) nil)
((funcall predicate (funcall key (cdar alist)))
(car alist))
(t (assoc-if predicate (cdr alist) :key key)))))
(defun rassoc-if-not (predicate alist &key key)
(rassoc-if (complement predicate) alist :key key))
(defun sublis (alist tree &key key test test-not)
(let ((ass (assoc (funcall key tree) :test test :test-not test-not)))
(if ass
(cdr assoc)
(typecase tree
(cons
(cons (sublis alist (car tree) :key key :test test :test-not test-not)
(sublis alist (cdr tree) :key key :test test :test-not test-not)))
(t tree)))))
(defun nsublis (alist tree &key key test test-not)
(sublvs alist tree :key key :test test :test-not test-not))
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