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1 ;;; range.el --- range functions
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2
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3 ;; Copyright (C) 1987 .. 1996 Free Software Foundation, Inc.
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4
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5 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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6 ;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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7 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
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8 ;; Version:
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76
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9 ;; $Id: range.el,v 1.2 1996/12/28 21:03:09 steve Exp $
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4
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10 ;; Keywords: range
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11
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12 ;; This file is part of tl (Tiny Library).
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13
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14 ;; This program is free software; you can redistribute it and/or
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15 ;; modify it under the terms of the GNU General Public License as
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16 ;; published by the Free Software Foundation; either version 2, or (at
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17 ;; your option) any later version.
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18
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19 ;; This program is distributed in the hope that it will be useful, but
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20 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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22 ;; General Public License for more details.
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23
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24 ;; You should have received a copy of the GNU General Public License
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25 ;; along with This program; see the file COPYING. If not, write to
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26 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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27 ;; Boston, MA 02111-1307, USA.
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28
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29 ;;; Code:
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30
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31 ;; These functions were imported from September Gnus 0.40.
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32
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33 (defun compress-sorted-numbers (numbers &optional always-list)
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34 "Convert list of numbers to a list of ranges or a single range.
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35 If ALWAYS-LIST is non-nil, this function will always release a list of
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36 ranges. [range.el]"
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37 (let* ((first (car numbers))
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38 (last (car numbers))
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39 result)
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40 (if (null numbers)
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41 nil
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42 (if (not (listp (cdr numbers)))
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43 numbers
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44 (while numbers
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45 (cond ((= last (car numbers)) nil) ;Omit duplicated number
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46 ((= (1+ last) (car numbers)) ;Still in sequence
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47 (setq last (car numbers)))
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48 (t ;End of one sequence
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49 (setq result
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50 (cons (if (= first last) first
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51 (cons first last)) result))
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52 (setq first (car numbers))
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53 (setq last (car numbers))))
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54 (setq numbers (cdr numbers)))
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55 (if (and (not always-list) (null result))
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56 (if (= first last) (list first) (cons first last))
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57 (nreverse (cons (if (= first last) first (cons first last))
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58 result)))))))
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59
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60 (defun expand-range (range)
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61 "Expand a range into a list of numbers. [range.el]"
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62 (cond ((numberp range)
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63 range)
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64 ((numberp (cdr range))
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65 (index (car range)(cdr range))
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66 )
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67 (t
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68 (let (dest ret)
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69 (mapcar (function
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70 (lambda (sec)
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71 (setq ret (expand-range sec))
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72 (setq dest
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73 (nconc dest
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74 (if (and (listp ret)
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75 (listp (cdr ret)))
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76 ret
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77 (list ret)
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78 )))
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79 ))
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80 range)
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81 dest))))
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82
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83 (defun member-of-range (number range)
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84 "Return t if NUMBER is a member of RANGE. [range.el]"
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85 (cond ((numberp range)
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86 (= number range)
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87 )
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88 ((numberp (cdr range))
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89 (and (<= (car range) number)
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90 (<= number (cdr range))
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91 )
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92 )
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93 (t
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94 (catch 'tag
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95 (while range
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96 (if (member-of-range number (car range))
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97 (throw 'tag t)
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98 )
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99 (setq range (cdr range))
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100 ))
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101 )))
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102
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103
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104 ;;; @ end
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105 ;;;
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106
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107 (provide 'range)
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108
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109 ;;; range.el ends here
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