From: Thien-Thi Nguyen Date: Mon, 27 Aug 2007 01:28:07 +0000 (+0000) Subject: Munge comments, whitespace, indentation, hanging parens; nfc. X-Git-Tag: emacs-pretest-23.0.90~11282 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=b74e26bbe218674e310249a3cd233dcf4a84850a;p=emacs.git Munge comments, whitespace, indentation, hanging parens; nfc. --- diff --git a/lisp/emacs-lisp/avl-tree.el b/lisp/emacs-lisp/avl-tree.el index 59ce6f891ce..75ec86c0d0e 100644 --- a/lisp/emacs-lisp/avl-tree.el +++ b/lisp/emacs-lisp/avl-tree.el @@ -1,109 +1,95 @@ -;;;; $Id: elib-node.el,v 0.8 1995/12/11 00:11:19 ceder Exp $ -;;;; Nodes used in binary trees and doubly linked lists. +;;; avl-tree.el --- balanced binary trees, AVL-trees -;; Copyright (C) 1991-1995 Free Software Foundation +;; Copyright (C) 1995, 2007 Free Software Foundation, Inc. ;; Author: Per Cederqvist ;; Inge Wallin -;; Maintainer: elib-maintainers@lysator.liu.se -;; Created: 20 May 1991 -;; Keywords: extensions, lisp - -;;;; This file is part of the GNU Emacs lisp library, Elib. -;;;; -;;;; GNU Elib is free software; you can redistribute it and/or modify -;;;; it under the terms of the GNU General Public License as published by -;;;; the Free Software Foundation; either version 2, or (at your option) -;;;; any later version. -;;;; -;;;; GNU Elib is distributed in the hope that it will be useful, -;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of -;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -;;;; GNU General Public License for more details. -;;;; -;;;; You should have received a copy of the GNU General Public License -;;;; along with GNU Elib; see the file COPYING. If not, write to -;;;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, -;;;; Boston, MA 02111-1307, USA -;;;; -;;;; Author: Inge Wallin -;;;; +;; Thomas Bellman +;; Maintainer: FSF +;; Created: 10 May 1991 +;; Keywords: extensions, data structures -;;; Commentary: +;; This file is part of GNU Emacs. -;;; A node is implemented as an array with three elements, using -;;; (elt node 0) as the left pointer -;;; (elt node 1) as the right pointer -;;; (elt node 2) as the data -;;; -;;; Some types of trees, e.g. AVL trees, need bigger nodes, but -;;; as long as the first three parts are the left pointer, the -;;; right pointer and the data field, these macros can be used. -;;; +;; GNU Emacs is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation; either version 3, or (at your option) +;; any later version. -;;; Code: +;; GNU Emacs is distributed in the hope that it will be useful, +;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;; GNU General Public License for more details. -;;; Begin HACKS to make avl-tree.el standalone. -;;; -;;; 0/ Don't do this. -;;; (provide 'elib-node) -;;; -;;; End HACKS to make avl-tree.el standalone. +;; You should have received a copy of the GNU General Public License +;; along with GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. +;;; Commentary: -(defmacro elib-node-create (left right data) +;; This file combines elib-node.el and avltree.el from Elib. +;; +;; * Comments from elib-node.el +;; A node is implemented as an array with three elements, using +;; (elt node 0) as the left pointer +;; (elt node 1) as the right pointer +;; (elt node 2) as the data +;; +;; Some types of trees, e.g. AVL trees, need bigger nodes, but +;; as long as the first three parts are the left pointer, the +;; right pointer and the data field, these macros can be used. +;; +;; * Comments from avltree.el +;; An AVL tree is a nearly-perfect balanced binary tree. A tree +;; consists of two cons cells, the first one holding the tag +;; 'AVLTREE in the car cell, and the second one having the tree +;; in the car and the compare function in the cdr cell. The tree has +;; a dummy node as its root with the real tree in the left pointer. +;; +;; Each node of the tree consists of one data element, one left +;; sub-tree and one right sub-tree. Each node also has a balance +;; count, which is the difference in depth of the left and right +;; sub-trees. +;;; Code: + +(defmacro elib-node-create (left right data) ;; Create a tree node from LEFT, RIGHT and DATA. (` (vector (, left) (, right) (, data)))) - (defmacro elib-node-left (node) - ;; Return the left pointer of NODE. (` (aref (, node) 0))) - (defmacro elib-node-right (node) - ;; Return the right pointer of NODE. (` (aref (, node) 1))) - (defmacro elib-node-data (node) - ;; Return the data of NODE. (` (aref (, node) 2))) - (defmacro elib-node-set-left (node newleft) - ;; Set the left pointer of NODE to NEWLEFT. (` (aset (, node) 0 (, newleft)))) - (defmacro elib-node-set-right (node newright) - ;; Set the right pointer of NODE to NEWRIGHT. (` (aset (, node) 1 (, newright)))) - (defmacro elib-node-set-data (node newdata) ;; Set the data of NODE to NEWDATA. (` (aset (, node) 2 (, newdata)))) - - (defmacro elib-node-branch (node branch) - ;; Get value of a branch of a node. ;; ;; NODE is the node, and BRANCH is the branch. ;; 0 for left pointer, 1 for right pointer and 2 for the data." (` (aref (, node) (, branch)))) - (defmacro elib-node-set-branch (node branch newval) - ;; Set value of a branch of a node. ;; ;; NODE is the node, and BRANCH is the branch. @@ -111,107 +97,27 @@ ;; NEWVAL is new value of the branch." (` (aset (, node) (, branch) (, newval)))) -;;; elib-node.el ends here. -;;;; $Id: avltree.el,v 0.8 1995/12/11 00:10:54 ceder Exp $ -;;;; This file implements balanced binary trees, AVL-trees. - -;; Copyright (C) 1991-1995 Free Software Foundation - -;; Author: Inge Wallin -;; Thomas Bellman -;; Maintainer: elib-maintainers@lysator.liu.se -;; Created: 10 May 1991 -;; Keywords: extensions, lisp - -;;;; This file is part of the GNU Emacs lisp library, Elib. -;;;; -;;;; GNU Elib is free software; you can redistribute it and/or modify -;;;; it under the terms of the GNU General Public License as published by -;;;; the Free Software Foundation; either version 2, or (at your option) -;;;; any later version. -;;;; -;;;; GNU Elib is distributed in the hope that it will be useful, -;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of -;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -;;;; GNU General Public License for more details. -;;;; -;;;; You should have received a copy of the GNU General Public License -;;;; along with GNU Elib; see the file COPYING. If not, write to -;;;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, -;;;; Boston, MA 02111-1307, USA -;;;; -;;;; Initial author: Thomas Bellman -;;;; Lysator Computer Club -;;;; Linkoping University -;;;; Sweden -;;;; -;;;; Bugfixes and completion: Inge Wallin -;;;; - - -;;; Commentary: -;;; -;;; An AVL tree is a nearly-perfect balanced binary tree. A tree -;;; consists of two cons cells, the first one holding the tag -;;; 'AVLTREE in the car cell, and the second one having the tree -;;; in the car and the compare function in the cdr cell. The tree has -;;; a dummy node as its root with the real tree in the left pointer. -;;; -;;; Each node of the tree consists of one data element, one left -;;; sub-tree and one right sub-tree. Each node also has a balance -;;; count, which is the difference in depth of the left and right -;;; sub-trees. -;;; - -;;; Code: - -;;; Begin HACKS to make avl-tree.el standalone. -;;; -;;; 1/ See above for inlined elib-node.el. -;;; (require 'elib-node) -;;; -;;; 2/ This requirement has been replaced w/ new code. -;;; (require 'stack-m) -;;; -;;; 3/ New code: (eval-when-compile (require 'cl)) (defun elib-stack-create () (list)) (defmacro elib-stack-push (stack object) `(push ,object ,stack)) (defmacro elib-stack-pop (stack) `(pop ,stack)) -;;; -;;; 4/ Provide `avl-tree' instead of `avltree'. (provide 'avl-tree) -;;; -;;; End HACKS to make avl-tree.el standalone. - ;;; ================================================================ ;;; Functions and macros handling an AVL tree node. -;; -;; The rest of the functions needed here can be found in -;; elib-node.el. -;; - - (defmacro elib-avl-node-create (left right data balance) - ;; Create and return an avl-tree node. (` (vector (, left) (, right) (, data) (, balance)))) - (defmacro elib-avl-node-balance (node) - ;; Return the balance field of a node. (` (aref (, node) 3))) - (defmacro elib-avl-node-set-balance (node newbal) - ;; Set the balance field of a node. (` (aset (, node) 3 (, newbal)))) - ;;; ================================================================ ;;; Internal functions for use in the AVL tree package @@ -220,39 +126,29 @@ ;;; The functions and macros in this section all start with `elib-avl-'. ;;; - (defmacro elib-avl-root (tree) - ;; Return the root node for an avl-tree. INTERNAL USE ONLY. (` (elib-node-left (car (cdr (, tree)))))) - (defmacro elib-avl-dummyroot (tree) - ;; Return the dummy node of an avl-tree. INTERNAL USE ONLY. - (` (car (cdr (, tree))))) - (defmacro elib-avl-cmpfun (tree) - ;; Return the compare function of AVL tree TREE. INTERNAL USE ONLY. (` (cdr (cdr (, tree))))) - ;; ---------------------------------------------------------------- ;; Deleting data - (defun elib-avl-del-balance1 (node branch) - ;; Rebalance a tree and return t if the height of the tree has shrunk. (let* ((br (elib-node-branch node branch)) - p1 - b1 - p2 - b2 - result) + p1 + b1 + p2 + b2 + result) (cond ((< (elib-avl-node-balance br) 0) (elib-avl-node-set-balance br 0) @@ -262,53 +158,50 @@ (elib-avl-node-set-balance br +1) nil) - (t ; Rebalance + (t + ;; Rebalance. (setq p1 (elib-node-right br) - b1 (elib-avl-node-balance p1)) + b1 (elib-avl-node-balance p1)) (if (>= b1 0) - ;; Single RR rotation - (progn - (elib-node-set-right br (elib-node-left p1)) - (elib-node-set-left p1 br) - (if (= 0 b1) - (progn - (elib-avl-node-set-balance br +1) - (elib-avl-node-set-balance p1 -1) - (setq result nil)) - (elib-avl-node-set-balance br 0) - (elib-avl-node-set-balance p1 0) - (setq result t)) - (elib-node-set-branch node branch p1) - result) - - ;; Double RL rotation - (setq p2 (elib-node-left p1) - b2 (elib-avl-node-balance p2)) - (elib-node-set-left p1 (elib-node-right p2)) - (elib-node-set-right p2 p1) - (elib-node-set-right br (elib-node-left p2)) - (elib-node-set-left p2 br) - (if (> b2 0) - (elib-avl-node-set-balance br -1) - (elib-avl-node-set-balance br 0)) - (if (< b2 0) - (elib-avl-node-set-balance p1 +1) - (elib-avl-node-set-balance p1 0)) - (elib-node-set-branch node branch p2) - (elib-avl-node-set-balance p2 0) - t) - )) - )) - + ;; Single RR rotation. + (progn + (elib-node-set-right br (elib-node-left p1)) + (elib-node-set-left p1 br) + (if (= 0 b1) + (progn + (elib-avl-node-set-balance br +1) + (elib-avl-node-set-balance p1 -1) + (setq result nil)) + (elib-avl-node-set-balance br 0) + (elib-avl-node-set-balance p1 0) + (setq result t)) + (elib-node-set-branch node branch p1) + result) + + ;; Double RL rotation. + (setq p2 (elib-node-left p1) + b2 (elib-avl-node-balance p2)) + (elib-node-set-left p1 (elib-node-right p2)) + (elib-node-set-right p2 p1) + (elib-node-set-right br (elib-node-left p2)) + (elib-node-set-left p2 br) + (if (> b2 0) + (elib-avl-node-set-balance br -1) + (elib-avl-node-set-balance br 0)) + (if (< b2 0) + (elib-avl-node-set-balance p1 +1) + (elib-avl-node-set-balance p1 0)) + (elib-node-set-branch node branch p2) + (elib-avl-node-set-balance p2 0) + t))))) (defun elib-avl-del-balance2 (node branch) - (let* ((br (elib-node-branch node branch)) - p1 - b1 - p2 - b2 - result) + p1 + b1 + p2 + b2 + result) (cond ((> (elib-avl-node-balance br) 0) (elib-avl-node-set-balance br 0) @@ -318,60 +211,55 @@ (elib-avl-node-set-balance br -1) nil) - (t ; Rebalance + (t + ;; Rebalance. (setq p1 (elib-node-left br) - b1 (elib-avl-node-balance p1)) + b1 (elib-avl-node-balance p1)) (if (<= b1 0) - ;; Single LL rotation - (progn - (elib-node-set-left br (elib-node-right p1)) - (elib-node-set-right p1 br) - (if (= 0 b1) - (progn - (elib-avl-node-set-balance br -1) - (elib-avl-node-set-balance p1 +1) - (setq result nil)) - (elib-avl-node-set-balance br 0) - (elib-avl-node-set-balance p1 0) - (setq result t)) - (elib-node-set-branch node branch p1) - result) - - ;; Double LR rotation - (setq p2 (elib-node-right p1) - b2 (elib-avl-node-balance p2)) - (elib-node-set-right p1 (elib-node-left p2)) - (elib-node-set-left p2 p1) - (elib-node-set-left br (elib-node-right p2)) - (elib-node-set-right p2 br) - (if (< b2 0) - (elib-avl-node-set-balance br +1) - (elib-avl-node-set-balance br 0)) - (if (> b2 0) - (elib-avl-node-set-balance p1 -1) - (elib-avl-node-set-balance p1 0)) - (elib-node-set-branch node branch p2) - (elib-avl-node-set-balance p2 0) - t) - )) - )) - + ;; Single LL rotation. + (progn + (elib-node-set-left br (elib-node-right p1)) + (elib-node-set-right p1 br) + (if (= 0 b1) + (progn + (elib-avl-node-set-balance br -1) + (elib-avl-node-set-balance p1 +1) + (setq result nil)) + (elib-avl-node-set-balance br 0) + (elib-avl-node-set-balance p1 0) + (setq result t)) + (elib-node-set-branch node branch p1) + result) + + ;; Double LR rotation. + (setq p2 (elib-node-right p1) + b2 (elib-avl-node-balance p2)) + (elib-node-set-right p1 (elib-node-left p2)) + (elib-node-set-left p2 p1) + (elib-node-set-left br (elib-node-right p2)) + (elib-node-set-right p2 br) + (if (< b2 0) + (elib-avl-node-set-balance br +1) + (elib-avl-node-set-balance br 0)) + (if (> b2 0) + (elib-avl-node-set-balance p1 -1) + (elib-avl-node-set-balance p1 0)) + (elib-node-set-branch node branch p2) + (elib-avl-node-set-balance p2 0) + t))))) (defun elib-avl-do-del-internal (node branch q) (let* ((br (elib-node-branch node branch))) - (if (elib-node-right br) - (if (elib-avl-do-del-internal br +1 q) - (elib-avl-del-balance2 node branch)) - (elib-node-set-data q (elib-node-data br)) - (elib-node-set-branch node branch - (elib-node-left br)) - t))) - - + (if (elib-node-right br) + (if (elib-avl-do-del-internal br +1 q) + (elib-avl-del-balance2 node branch)) + (elib-node-set-data q (elib-node-data br)) + (elib-node-set-branch node branch + (elib-node-left br)) + t))) (defun elib-avl-do-delete (cmpfun root branch data) - ;; Return t if the height of the tree has shrunk. (let* ((br (elib-node-branch root branch))) (cond @@ -380,42 +268,37 @@ ((funcall cmpfun data (elib-node-data br)) (if (elib-avl-do-delete cmpfun br 0 data) - (elib-avl-del-balance1 root branch))) + (elib-avl-del-balance1 root branch))) ((funcall cmpfun (elib-node-data br) data) (if (elib-avl-do-delete cmpfun br 1 data) - (elib-avl-del-balance2 root branch))) + (elib-avl-del-balance2 root branch))) (t ;; Found it. Let's delete it. (cond ((null (elib-node-right br)) - (elib-node-set-branch root branch (elib-node-left br)) - t) + (elib-node-set-branch root branch (elib-node-left br)) + t) ((null (elib-node-left br)) - (elib-node-set-branch root branch (elib-node-right br)) - t) + (elib-node-set-branch root branch (elib-node-right br)) + t) (t - (if (elib-avl-do-del-internal br 0 br) - (elib-avl-del-balance1 root branch))))) - ))) - + (if (elib-avl-do-del-internal br 0 br) + (elib-avl-del-balance1 root branch)))))))) ;; ---------------------------------------------------------------- ;; Entering data - - (defun elib-avl-enter-balance1 (node branch) - ;; Rebalance a tree and return t if the height of the tree has grown. (let* ((br (elib-node-branch node branch)) - p1 - p2 - b2 - result) + p1 + p2 + b2 + result) (cond ((< (elib-avl-node-balance br) 0) (elib-avl-node-set-balance br 0) @@ -426,42 +309,39 @@ t) (t - ;; Tree has grown => Rebalance + ;; Tree has grown => Rebalance. (setq p1 (elib-node-right br)) (if (> (elib-avl-node-balance p1) 0) - ;; Single RR rotation - (progn - (elib-node-set-right br (elib-node-left p1)) - (elib-node-set-left p1 br) - (elib-avl-node-set-balance br 0) - (elib-node-set-branch node branch p1)) - - ;; Double RL rotation - (setq p2 (elib-node-left p1) - b2 (elib-avl-node-balance p2)) - (elib-node-set-left p1 (elib-node-right p2)) - (elib-node-set-right p2 p1) - (elib-node-set-right br (elib-node-left p2)) - (elib-node-set-left p2 br) - (if (> b2 0) - (elib-avl-node-set-balance br -1) - (elib-avl-node-set-balance br 0)) - (if (< b2 0) - (elib-avl-node-set-balance p1 +1) - (elib-avl-node-set-balance p1 0)) - (elib-node-set-branch node branch p2)) + ;; Single RR rotation. + (progn + (elib-node-set-right br (elib-node-left p1)) + (elib-node-set-left p1 br) + (elib-avl-node-set-balance br 0) + (elib-node-set-branch node branch p1)) + + ;; Double RL rotation. + (setq p2 (elib-node-left p1) + b2 (elib-avl-node-balance p2)) + (elib-node-set-left p1 (elib-node-right p2)) + (elib-node-set-right p2 p1) + (elib-node-set-right br (elib-node-left p2)) + (elib-node-set-left p2 br) + (if (> b2 0) + (elib-avl-node-set-balance br -1) + (elib-avl-node-set-balance br 0)) + (if (< b2 0) + (elib-avl-node-set-balance p1 +1) + (elib-avl-node-set-balance p1 0)) + (elib-node-set-branch node branch p2)) (elib-avl-node-set-balance (elib-node-branch node branch) 0) - nil)) - )) - + nil)))) (defun elib-avl-enter-balance2 (node branch) - ;; Return t if the tree has grown. (let* ((br (elib-node-branch node branch)) - p1 - p2 - b2) + p1 + p2 + b2) (cond ((> (elib-avl-node-balance br) 0) (elib-avl-node-set-balance br 0) @@ -472,90 +352,86 @@ t) (t - ;; Balance was -1 => Rebalance + ;; Balance was -1 => Rebalance. (setq p1 (elib-node-left br)) (if (< (elib-avl-node-balance p1) 0) - ;; Single LL rotation - (progn - (elib-node-set-left br (elib-node-right p1)) - (elib-node-set-right p1 br) - (elib-avl-node-set-balance br 0) - (elib-node-set-branch node branch p1)) - - ;; Double LR rotation - (setq p2 (elib-node-right p1) - b2 (elib-avl-node-balance p2)) - (elib-node-set-right p1 (elib-node-left p2)) - (elib-node-set-left p2 p1) - (elib-node-set-left br (elib-node-right p2)) - (elib-node-set-right p2 br) - (if (< b2 0) - (elib-avl-node-set-balance br +1) - (elib-avl-node-set-balance br 0)) - (if (> b2 0) - (elib-avl-node-set-balance p1 -1) - (elib-avl-node-set-balance p1 0)) - (elib-node-set-branch node branch p2)) + ;; Single LL rotation. + (progn + (elib-node-set-left br (elib-node-right p1)) + (elib-node-set-right p1 br) + (elib-avl-node-set-balance br 0) + (elib-node-set-branch node branch p1)) + + ;; Double LR rotation. + (setq p2 (elib-node-right p1) + b2 (elib-avl-node-balance p2)) + (elib-node-set-right p1 (elib-node-left p2)) + (elib-node-set-left p2 p1) + (elib-node-set-left br (elib-node-right p2)) + (elib-node-set-right p2 br) + (if (< b2 0) + (elib-avl-node-set-balance br +1) + (elib-avl-node-set-balance br 0)) + (if (> b2 0) + (elib-avl-node-set-balance p1 -1) + (elib-avl-node-set-balance p1 0)) + (elib-node-set-branch node branch p2)) (elib-avl-node-set-balance (elib-node-branch node branch) 0) - nil)) - )) - + nil)))) (defun elib-avl-do-enter (cmpfun root branch data) - ;; Return t if height of tree ROOT has grown. INTERNAL USE ONLY. (let ((br (elib-node-branch root branch))) (cond ((null br) - ;; Data not in tree, insert it + ;; Data not in tree, insert it. (elib-node-set-branch root branch - (elib-avl-node-create nil nil data 0)) + (elib-avl-node-create nil nil data 0)) t) ((funcall cmpfun data (elib-node-data br)) (and (elib-avl-do-enter cmpfun - br - 0 data) - (elib-avl-enter-balance2 root branch))) + br + 0 data) + (elib-avl-enter-balance2 root branch))) ((funcall cmpfun (elib-node-data br) data) (and (elib-avl-do-enter cmpfun - br - 1 data) - (elib-avl-enter-balance1 root branch))) + br + 1 data) + (elib-avl-enter-balance1 root branch))) (t (elib-node-set-data br data) nil)))) - ;; ---------------------------------------------------------------- - (defun elib-avl-mapc (map-function root) ;; Apply MAP-FUNCTION to all nodes in the tree starting with ROOT. ;; The function is applied in-order. ;; ;; Note: MAP-FUNCTION is applied to the node and not to the data itself. ;; INTERNAL USE ONLY. - (let ((node root) - (stack (elib-stack-create)) - (go-left t)) + (stack (elib-stack-create)) + (go-left t)) (elib-stack-push stack nil) (while node (if (and go-left - (elib-node-left node)) - (progn ; Do the left subtree first. - (elib-stack-push stack node) - (setq node (elib-node-left node))) - (funcall map-function node) ; Apply the function... - (if (elib-node-right node) ; and do the right subtree. - (setq node (elib-node-right node) - go-left t) - (setq node (elib-stack-pop stack) - go-left nil)))))) - + (elib-node-left node)) + ;; Do the left subtree first. + (progn + (elib-stack-push stack node) + (setq node (elib-node-left node))) + ;; Apply the function... + (funcall map-function node) + ;; and do the right subtree. + (if (elib-node-right node) + (setq node (elib-node-right node) + go-left t) + (setq node (elib-stack-pop stack) + go-left nil)))))) (defun elib-avl-do-copy (root) ;; Copy the tree with ROOT as root. @@ -563,60 +439,50 @@ (if (null root) nil (elib-avl-node-create (elib-avl-do-copy (elib-node-left root)) - (elib-avl-do-copy (elib-node-right root)) - (elib-node-data root) - (elib-avl-node-balance root)))) - + (elib-avl-do-copy (elib-node-right root)) + (elib-node-data root) + (elib-avl-node-balance root)))) ;;; ================================================================ ;;; The public functions which operate on AVL trees. - (defun avltree-create (compare-function) "Create an empty avl tree. COMPARE-FUNCTION is a function which takes two arguments, A and B, and returns non-nil if A is less than B, and nil otherwise." (cons 'AVLTREE - (cons (elib-avl-node-create nil nil nil 0) - compare-function))) - + (cons (elib-avl-node-create nil nil nil 0) + compare-function))) (defun avltree-p (obj) "Return t if OBJ is an avl tree, nil otherwise." (eq (car-safe obj) 'AVLTREE)) - (defun avltree-compare-function (tree) "Return the comparision function for the avl tree TREE." (elib-avl-cmpfun tree)) - (defun avltree-empty (tree) "Return t if TREE is emtpy, otherwise return nil." (null (elib-avl-root tree))) - (defun avltree-enter (tree data) "In the avl tree TREE insert DATA. Return DATA." - (elib-avl-do-enter (elib-avl-cmpfun tree) - (elib-avl-dummyroot tree) - 0 - data) + (elib-avl-dummyroot tree) + 0 + data) data) - (defun avltree-delete (tree data) "From the avl tree TREE, delete DATA. Return the element in TREE which matched DATA, nil if no element matched." - (elib-avl-do-delete (elib-avl-cmpfun tree) - (elib-avl-dummyroot tree) - 0 - data)) - + (elib-avl-dummyroot tree) + 0 + data)) (defun avltree-member (tree data) "Return the element in the avl tree TREE which matches DATA. @@ -624,90 +490,79 @@ Matching uses the compare function previously specified in `avltree-create' when TREE was created. If there is no such element in the tree, the value is nil." - (let ((node (elib-avl-root tree)) - (compare-function (elib-avl-cmpfun tree)) - found) + (compare-function (elib-avl-cmpfun tree)) + found) (while (and node - (not found)) + (not found)) (cond ((funcall compare-function data (elib-node-data node)) - (setq node (elib-node-left node))) + (setq node (elib-node-left node))) ((funcall compare-function (elib-node-data node) data) - (setq node (elib-node-right node))) + (setq node (elib-node-right node))) (t - (setq found t)))) + (setq found t)))) (if node - (elib-node-data node) + (elib-node-data node) nil))) - - (defun avltree-map (__map-function__ tree) "Apply MAP-FUNCTION to all elements in the avl tree TREE." (elib-avl-mapc (function (lambda (node) - (elib-node-set-data node - (funcall __map-function__ - (elib-node-data node))))) + (elib-node-set-data node + (funcall __map-function__ + (elib-node-data node))))) (elib-avl-root tree))) - - (defun avltree-first (tree) "Return the first element in TREE, or nil if TREE is empty." - (let ((node (elib-avl-root tree))) (if node - (progn - (while (elib-node-left node) - (setq node (elib-node-left node))) - (elib-node-data node)) + (progn + (while (elib-node-left node) + (setq node (elib-node-left node))) + (elib-node-data node)) nil))) - (defun avltree-last (tree) "Return the last element in TREE, or nil if TREE is empty." (let ((node (elib-avl-root tree))) (if node - (progn - (while (elib-node-right node) - (setq node (elib-node-right node))) - (elib-node-data node)) + (progn + (while (elib-node-right node) + (setq node (elib-node-right node))) + (elib-node-data node)) nil))) - (defun avltree-copy (tree) "Return a copy of the avl tree TREE." (let ((new-tree (avltree-create - (elib-avl-cmpfun tree)))) + (elib-avl-cmpfun tree)))) (elib-node-set-left (elib-avl-dummyroot new-tree) - (elib-avl-do-copy (elib-avl-root tree))) + (elib-avl-do-copy (elib-avl-root tree))) new-tree)) - (defun avltree-flatten (tree) "Return a sorted list containing all elements of TREE." (nreverse (let ((treelist nil)) (elib-avl-mapc (function (lambda (node) - (setq treelist (cons (elib-node-data node) - treelist)))) - (elib-avl-root tree)) + (setq treelist (cons (elib-node-data node) + treelist)))) + (elib-avl-root tree)) treelist))) - (defun avltree-size (tree) "Return the number of elements in TREE." (let ((treesize 0)) (elib-avl-mapc (function (lambda (data) - (setq treesize (1+ treesize)) - data)) - (elib-avl-root tree)) + (setq treesize (1+ treesize)) + data)) + (elib-avl-root tree)) treesize)) - (defun avltree-clear (tree) "Clear the avl tree TREE." (elib-node-set-left (elib-avl-dummyroot tree) nil))