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thisirs/gist:4162463

Created November 28, 2012 16:48
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Function returning the place of an element in a tree
Raw
gistfile1.el
(defun place-of (item tree)
(let ((place (place-of-1 item tree "")))
(and place
(intern (concat "c" place "r")))))
(defun place-of-1 (item tree place)
(cond
((null tree))
((consp tree)
(let (found)
(while (and tree (not found))
(unless (setq found (place-of-1 item (car tree) (concat "a" place)))
(setq place (concat "d" place))
(setq tree (cdr tree))))
found))
(t (if (eq item tree) place))))
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