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1 ;;; alist.el --- utility functions about association-list
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2
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3 ;; Copyright (C) 1993,1994,1995,1996,1998 Free Software Foundation, Inc.
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Keywords: alist
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7
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8 ;; This file is part of APEL (A Portable Emacs Library).
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9
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10 ;; This program is free software; you can redistribute it and/or
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11 ;; modify it under the terms of the GNU General Public License as
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12 ;; published by the Free Software Foundation; either version 2, or (at
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13 ;; your option) any later version.
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14
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15 ;; This program is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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442
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25
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26 ;;;###autoload
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27 (defun vassoc (key valist)
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28 "Search VALIST for a vector whose first element is equal to KEY.
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29 See also `assoc'."
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30 ;; by Stig@hackvan.com
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31 (let (el)
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32 (catch 'done
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33 (while (setq el (pop valist))
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34 (and (equal key (aref el 0))
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35 (throw 'done el))))))
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36
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428
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37
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38 ;;;###autoload
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39 (defun put-alist (item value alist)
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40 "Modify ALIST to set VALUE to ITEM.
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41 If there is a pair whose car is ITEM, replace its cdr by VALUE.
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42 If there is not such pair, create new pair (ITEM . VALUE) and
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43 return new alist whose car is the new pair and cdr is ALIST.
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44 \[tomo's ELIS like function]"
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45 (let ((pair (assoc item alist)))
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46 (if pair
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47 (progn
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48 (setcdr pair value)
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49 alist)
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50 (cons (cons item value) alist)
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51 )))
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52
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53 ;;;###autoload
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54 (defun del-alist (item alist)
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55 "If there is a pair whose key is ITEM, delete it from ALIST.
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56 \[tomo's ELIS emulating function]"
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57 (if (equal item (car (car alist)))
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58 (cdr alist)
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59 (let ((pr alist)
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60 (r (cdr alist))
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61 )
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62 (catch 'tag
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63 (while (not (null r))
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64 (if (equal item (car (car r)))
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65 (progn
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66 (rplacd pr (cdr r))
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67 (throw 'tag alist)))
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68 (setq pr r)
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69 (setq r (cdr r))
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70 )
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71 alist))))
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72
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73 ;;;###autoload
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74 (defun set-alist (symbol item value)
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75 "Modify a alist indicated by SYMBOL to set VALUE to ITEM."
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76 (or (boundp symbol)
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77 (set symbol nil)
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78 )
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79 (set symbol (put-alist item value (symbol-value symbol)))
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80 )
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81
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82 ;;;###autoload
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83 (defun remove-alist (symbol item)
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84 "Remove ITEM from the alist indicated by SYMBOL."
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85 (and (boundp symbol)
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86 (set symbol (del-alist item (symbol-value symbol)))
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87 ))
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88
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89 ;;;###autoload
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90 (defun modify-alist (modifier default)
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91 "Modify alist DEFAULT into alist MODIFIER."
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92 (mapcar (function
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93 (lambda (as)
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94 (setq default (put-alist (car as)(cdr as) default))
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95 ))
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96 modifier)
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97 default)
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98
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99 ;;;###autoload
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100 (defun set-modified-alist (sym modifier)
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101 "Modify a value of a symbol SYM into alist MODIFIER.
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102 The symbol SYM should be alist. If it is not bound,
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103 its value regard as nil."
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104 (if (not (boundp sym))
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105 (set sym nil)
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106 )
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107 (set sym (modify-alist modifier (eval sym)))
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108 )
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109
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110
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111 ;;; @ end
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112 ;;;
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113
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114 (provide 'alist)
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115
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116 ;;; alist.el ends here
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