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;;; alist.el --- utility functions about association-list
;; Copyright (C) 1993,1994,1995,1996,1998 Free Software Foundation, Inc.
;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Keywords: alist
;; This file is part of APEL (A Portable Emacs Library).
;; This program 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.
;; This program 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 Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;;###autoload
(defun vassoc (key valist)
"Search VALIST for a vector whose first element is equal to KEY.
See also `assoc'."
;; by Stig@hackvan.com
(let (el)
(catch 'done
(while (setq el (pop valist))
(and (equal key (aref el 0))
(throw 'done el))))))
;;;###autoload
(defun put-alist (item value alist)
"Modify ALIST to set VALUE to ITEM.
If there is a pair whose car is ITEM, replace its cdr by VALUE.
If there is not such pair, create new pair (ITEM . VALUE) and
return new alist whose car is the new pair and cdr is ALIST.
\[tomo's ELIS like function]"
(let ((pair (assoc item alist)))
(if pair
(progn
(setcdr pair value)
alist)
(cons (cons item value) alist)
)))
;;;###autoload
(defun del-alist (item alist)
"If there is a pair whose key is ITEM, delete it from ALIST.
\[tomo's ELIS emulating function]"
(if (equal item (car (car alist)))
(cdr alist)
(let ((pr alist)
(r (cdr alist))
)
(catch 'tag
(while (not (null r))
(if (equal item (car (car r)))
(progn
(rplacd pr (cdr r))
(throw 'tag alist)))
(setq pr r)
(setq r (cdr r))
)
alist))))
;;;###autoload
(defun set-alist (symbol item value)
"Modify a alist indicated by SYMBOL to set VALUE to ITEM."
(or (boundp symbol)
(set symbol nil)
)
(set symbol (put-alist item value (symbol-value symbol)))
)
;;;###autoload
(defun remove-alist (symbol item)
"Remove ITEM from the alist indicated by SYMBOL."
(and (boundp symbol)
(set symbol (del-alist item (symbol-value symbol)))
))
;;;###autoload
(defun modify-alist (modifier default)
"Modify alist DEFAULT into alist MODIFIER."
(mapcar (function
(lambda (as)
(setq default (put-alist (car as)(cdr as) default))
))
modifier)
default)
;;;###autoload
(defun set-modified-alist (sym modifier)
"Modify a value of a symbol SYM into alist MODIFIER.
The symbol SYM should be alist. If it is not bound,
its value regard as nil."
(if (not (boundp sym))
(set sym nil)
)
(set sym (modify-alist modifier (eval sym)))
)
;;; @ end
;;;
(provide 'alist)
;;; alist.el ends here
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