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# 08oct09abu
# (c) Software Lab. Alexander Burger
# *Prune
(de root (Tree)
(cond
((not Tree) (val *DB))
((atom Tree) (val Tree))
((ext? (cdr Tree)) (get @ (car Tree)))
((atom (cdr Tree))
(get *DB (cdr Tree) (car Tree)) )
(T (get (cddr Tree) (cadr Tree) (car Tree))) ) )
# Fetch
(de fetch (Tree Key)
(let? Node (cdr (root Tree))
(and *Prune (idx '*Prune Node T))
(use R
(loop
(T
(and
(setq R (rank Key (cdr (val Node))))
(= Key (car R)) )
(or (cddr R) (fin (car R))) )
(NIL
(setq Node (if R (cadr R) (car (val Node)))) ) ) ) ) )
# Store
(de store (Tree Key Val Dbf)
(default Dbf (1 . 256))
(if (atom Tree)
(let Base (or Tree *DB)
(_store (or (val Base) (set Base (cons 0)))) )
(let Base
(if (atom (cdr Tree))
(or
(ext? (cdr Tree))
(get *DB (cdr Tree))
(put *DB (cdr Tree) (new T)) )
(or
(get (cddr Tree) (cadr Tree))
(put (cddr Tree) (cadr Tree) (new T)) ) )
(_store
(or
(get Base (car Tree))
(put Base (car Tree) (cons 0)) ) ) ) ) )
(de _store (Root)
(and *Prune (cdr Root) (idx '*Prune @ T))
(ifn Val
(when (and (cdr Root) (_del @))
(touch Base)
(cond
(*Solo (zap (cdr Root)))
(*Zap (push @ (cdr Root))) )
(con Root) )
(and (= Val (fin Key)) (off Val))
(if (cdr Root)
(when (_put @)
(touch Base)
(con Root (def (new (car Dbf)) (list (car @) (cdr @)))) )
(touch Base)
(con Root
(def (new (car Dbf))
(list NIL (cons Key NIL Val)) ) )
(inc Root) ) ) )
(de _put (Top)
(let (V (val Top) R (rank Key (cdr V)))
(if (and R (= Key (car R)))
(nil (touch Top) (con (cdr R) Val))
(cond
(R
(let X (memq R V)
(if (cadr R)
(when (_put @)
(touch Top)
(set (cdr R) (car @))
(con X (cons (cdr @) (cdr X)))
(_splitBt) )
(touch Top)
(con X
(cons (cons Key (cons NIL Val)) (cdr X)) )
(touch Base)
(inc Root)
(_splitBt) ) ) )
((car V)
(when (_put @)
(touch Top)
(set V (car @))
(con V (cons (cdr @) (cdr V)))
(_splitBt) ) )
(T
(touch Top)
(con V
(cons (cons Key (cons NIL Val)) (cdr V)) )
(touch Base)
(inc Root)
(_splitBt) ) ) ) ) )
(de _splitBt ()
(when (and (cddddr V) (> (size Top) (cdr Dbf)))
(let (N (>> 1 (length V)) X (get V (inc N)))
(set (cdr X)
(def (new (car Dbf))
(cons (cadr X) (nth V (+ 2 N))) ) )
(cons
(if *Solo
(prog (set Top (head N V)) Top)
(and *Zap (push @ Top))
(def (new (car Dbf)) (head N V)) )
X ) ) ) )
# Del
(de _del (Top)
(let (V (val Top) R (rank Key (cdr V)))
(cond
((not R)
(when (and (car V) (_del @))
(touch Top)
(cond
(*Solo (zap (car V)))
(*Zap (push @ (car V))) )
(set V)
(not (cdr V)) ) )
((= Key (car R))
(if (cadr R)
(let X (val @)
(while (car X) (setq X (val @)))
(touch Top)
(xchg R (cadr X))
(con (cdr R) (cddr (cadr X)))
(when (_del (cadr R))
(cond
(*Solo (zap (cadr R)))
(*Zap (push @ (cadr R))) )
(set (cdr R)) ) )
(touch Base)
(dec Root)
(nand
(or
(con V (delq R (cdr V)))
(car V) )
(touch Top) ) ) )
((cadr R)
(when (_del @)
(touch Top)
(cond
(*Solo (zap (cadr R)))
(*Zap (push @ (cadr R))) )
(set (cdr R)) ) ) ) ) )
# Delayed deletion
(de zap_ ()
(let (F (cdr *Zap) Z (pack F "_"))
(cond
((info Z)
(in Z (while (rd) (zap @)))
(if (info F)
(call 'mv F Z)
(call 'rm Z) ) )
((info F) (call 'mv F Z)) ) ) )
# Tree node count
(de count (Tree)
(or (car (root Tree)) 0) )
# Return first leaf
(de leaf (Tree)
(let (Node (cdr (root Tree)) X)
(while (val Node)
(setq X (cadr @) Node (car @)) )
(cddr X) ) )
# Reverse node
(de revNode (Node)
(let? Lst (val Node)
(let (L (car Lst) R)
(for X (cdr Lst)
(push 'R (cons (car X) L (cddr X)))
(setq L (cadr X)) )
(cons L R) ) ) )
# Key management
(de minKey (Tree Min Max)
(default Max T)
(let (Node (cdr (root Tree)) K)
(use (V R X)
(loop
(NIL (setq V (val Node)) K)
(T
(and
(setq R (rank Min (cdr V)))
(= Min (car R)) )
Min )
(if R
(prog
(and
(setq X (cdr (memq R V)))
(>= Max (caar X))
(setq K (caar X)) )
(setq Node (cadr R)) )
(when (>= Max (caadr V))
(setq K (caadr V)) )
(setq Node (car V)) ) ) ) ) )
(de maxKey (Tree Min Max)
(default Max T)
(let (Node (cdr (root Tree)) K)
(use (V R X)
(loop
(NIL (setq V (revNode Node)) K)
(T
(and
(setq R (rank Max (cdr V) T))
(= Max (car R)) )
Max )
(if R
(prog
(and
(setq X (cdr (memq R V)))
(>= (caar X) Min)
(setq K (caar X)) )
(setq Node (cadr R)) )
(when (>= (caadr V) Min)
(setq K (caadr V)) )
(setq Node (car V)) ) ) ) ) )
# Step
(de init (Tree Beg End)
(or Beg End (on End))
(let (Node (cdr (root Tree)) Q)
(use (V R X)
(if (>= End Beg)
(loop
(NIL (setq V (val Node)))
(T
(and
(setq R (rank Beg (cdr V)))
(= Beg (car R)) )
(push 'Q (memq R V)) )
(if R
(prog
(and
(setq X (cdr (memq R V)))
(>= End (caar X))
(push 'Q X) )
(setq Node (cadr R)) )
(and
(cdr V)
(>= End (caadr V))
(push 'Q (cdr V)) )
(setq Node (car V)) ) )
(loop
(NIL (setq V (revNode Node)))
(T
(and
(setq R (rank Beg (cdr V) T))
(= Beg (car R)) )
(push 'Q (memq R V)) )
(if R
(prog
(and
(setq X (cdr (memq R V)))
(>= (caar X) End)
(push 'Q X) )
(setq Node (cadr R)) )
(and
(cdr V)
(>= (caadr V) End)
(push 'Q (cdr V)) )
(setq Node (car V)) ) ) ) )
(cons (cons (cons Beg End) Q)) ) )
(de step (Q Flg)
(use (L F X)
(catch NIL
(loop
(until (cdar Q)
(or (cdr Q) (throw))
(set Q (cadr Q))
(con Q (cddr Q)) )
(setq
L (car Q)
F (>= (cdar L) (caar L))
X (pop (cdr L)) )
(or (cadr L) (con L (cddr L)))
(if ((if F > <) (car X) (cdar L))
(con (car Q))
(for (V (cadr X) ((if F val revNode) V) (car @))
(con L (cons (cdr @) (cdr L)))
(wipe V) )
(unless (and Flg (flg? (fin (car X))))
(throw NIL
(or (cddr X) (fin (car X))) ) ) ) ) ) ) )
(====)
# Scan tree nodes
(de scan ("Tree" "Fun" "Beg" "End" "Flg")
(default "Fun" println)
(or "Beg" "End" (on "End"))
((if (>= "End" "Beg") _scan _nacs)
(cdr (root "Tree")) ) )
(de _scan ("Node")
(let? "V" (val "Node")
(for "X"
(if (rank "Beg" (cdr "V"))
(let "R" @
(if (= "Beg" (car "R"))
(memq "R" (cdr "V"))
(_scan (cadr "R"))
(cdr (memq "R" (cdr "V"))) ) )
(_scan (car "V"))
(cdr "V") )
(T (> (car "X") "End"))
(unless (and "Flg" (flg? (fin (car "X"))))
("Fun"
(car "X")
(or (cddr "X") (fin (car "X"))) ) )
(_scan (cadr "X")) )
(wipe "Node") ) )
(de _nacs ("Node")
(let? "V" (revNode "Node")
(for "X"
(if (rank "Beg" (cdr "V") T)
(let "R" @
(if (= "Beg" (car "R"))
(memq "R" (cdr "V"))
(_nacs (cadr "R"))
(cdr (memq "R" (cdr "V"))) ) )
(_nacs (car "V"))
(cdr "V") )
(T (> "End" (car "X")))
(unless (and "Flg" (flg? (fin (car "X"))))
("Fun"
(car "X")
(or (cddr "X") (fin (car "X"))) ) )
(_nacs (cadr "X")) )
(wipe "Node") ) )
(====)
# Iterate tree values
(de iter ("Tree" "Fun" "Beg" "End" "Flg")
(default "Fun" println)
(or "Beg" "End" (on "End"))
((if (>= "End" "Beg") _iter _reti)
(cdr (root "Tree")) ) )
(de _iter ("Node")
(let? "V" (val "Node")
(for "X"
(if (rank "Beg" (cdr "V"))
(let "R" @
(if (= "Beg" (car "R"))
(memq "R" (cdr "V"))
(_iter (cadr "R"))
(cdr (memq "R" (cdr "V"))) ) )
(_iter (car "V"))
(cdr "V") )
(T (> (car "X") "End"))
(unless (and "Flg" (flg? (fin (car "X"))))
("Fun" (or (cddr "X") (fin (car "X")))) )
(_iter (cadr "X")) )
(wipe "Node") ) )
(de _reti ("Node")
(let? "V" (revNode "Node")
(for "X"
(if (rank "Beg" (cdr "V") T)
(let "R" @
(if (= "Beg" (car "R"))
(memq "R" (cdr "V"))
(_reti (cadr "R"))
(cdr (memq "R" (cdr "V"))) ) )
(_reti (car "V"))
(cdr "V") )
(T (> "End" (car "X")))
(unless (and "Flg" (flg? (fin (car "X"))))
("Fun" (or (cddr "X") (fin (car "X")))) )
(_reti (cadr "X")) )
(wipe "Node") ) )
(====)
(de prune (Done)
(for Node (idx '*Prune)
(recur (Node)
(let? V (val (lieu Node))
(if (nor (car V) (find cadr (cdr V)))
(wipe Node)
(recurse (car V))
(for X (cdr V)
(recurse (cadr X))
(wipe (lieu (cddr X))) ) ) ) ) )
(setq *Prune (not Done)) )
# Delete Tree
(de zapTree (Node)
(let? V (val Node)
(zapTree (car V))
(for L (cdr V)
(zapTree (cadr L)) )
(zap Node) ) )
# Check tree structure
(de chkTree ("Node" "Fun")
(let ("N" 0 "X")
(when "Node"
(recur ("Node")
(let "V" (val "Node")
(let "L" (car "V")
(for "Y" (cdr "V")
(when "L"
(unless (ext? "L")
(quit "Bad node link" "Node") )
(recurse "L") )
(when (>= "X" (car "Y"))
(quit "Bad sequence" "Node") )
(setq "X" (car "Y"))
(inc '"N")
(and
"Fun"
(not ("Fun" (car "Y") (cddr "Y")))
(quit "Check fail" "Node") )
(setq "L" (cadr "Y")) )
(and "L" (recurse "L")) ) )
(wipe "Node") ) )
"N" ) )
# vi:et:ts=3:sw=3
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