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xanadu - btree

This commit is contained in:
erana 2012-01-21 16:30:33 +09:00
parent f18a6ab379
commit af119e61eb
1 changed files with 29 additions and 25 deletions
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54
scsh/xanadu/b-tree.scm
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@ -160,33 +160,37 @@
(call-with-values
(lambda () (values lefttree righttree))
(lambda (lefttree righttree)
(do ((i 0 (+ i 1)))
((cond ((or lefttree
(not (((vector-ref lefttree i) 'get-data)))
(string=? (((vector-ref lefttree i) 'get-data)) ""))
(let ((lr (vector-median ((lefttree 'get-left)))));;FIXME right also descend
(let ((new-node (make-b-tree-node (car lr) (cadr lr))));;FIXME lenght mustbe n-ary
((new-node 'set-data!) str)
((lefttree 'set-left-with-index!) i new-node)
)))
((and (string<? str (((vector-ref lefttree i) 'get-data)))
(string>? str (((vector-ref lefttree (+ i 1)) 'get-data))))
(let ((lr (vector-median ((lefttree 'get-left)))))
(let ((new-node (make-b-tree-node (car lr) (cadr lr))))
((new-node 'set-data!) str)
(vector-set! lefttree i new-node)
)))
;;((string=? str (((vector-ref lefttree i)'get-data)))
;; (set! i (vector-length tree)))
((>= i (- len 1));;last node
(do ((j 0 (+ j 1)))
((= j len) (display "node not added.") 0)
(add-rec str (vector-ref lefttree i)))
)
(else (display "never reached.")))))
(add-rec-side-tree str lefttree)
(add-rec-side-tree str righttree)
))))
(define (add-rec-side-tree str side-tree)
(do ((i 0 (+ i 1)))
((cond ((or side-tree
(not (((vector-ref side-tree i) 'get-data)))
(string=? (((vector-ref side-tree i) 'get-data)) ""))
(let ((lr (vector-median ((side-tree 'get-left)))));;FIXME right also descend
(let ((new-node (make-b-tree-node (car lr) (cadr lr))));;FIXME lenght mustbe n-ary
((new-node 'set-data!) str)
((side-tree 'set-left-with-index!) i new-node)
)))
((and (string<? str (((vector-ref side-tree i) 'get-data)))
(string>? str (((vector-ref side-tree (+ i 1)) 'get-data))))
(let ((lr (vector-median ((side-tree 'get-left)))))
(let ((new-node (make-b-tree-node (car lr) (cadr lr))))
((new-node 'set-data!) str)
(vector-set! side-tree i new-node)
)))
;;((string=? str (((vector-ref side-tree i)'get-data)))
;; (set! i (vector-length tree)))
((>= i (- len 1));;last node
(do ((j 0 (+ j 1)))
((= j len) (display "node not added.") 0)
(add-rec str (vector-ref side-tree i)))
)
(else (display "never reached."))))))
(define (add str)
(add-rec str *tree)
)