1 ;;; gnus-range.el --- range and sequence functions for Gnus
3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
29 (eval-when-compile (require 'cl))
31 ;;; List and range functions
33 (defsubst gnus-range-normalize (range)
35 If RANGE is a single range, return (RANGE). Otherwise, return RANGE."
36 (if (listp (cdr range)) (list range) range))
38 (defun gnus-last-element (list)
39 "Return last element of LIST."
41 (setq list (cdr list)))
44 (defun gnus-copy-sequence (list)
45 "Do a complete, total copy of a list."
48 (if (consp (car list))
49 (push (gnus-copy-sequence (pop list)) out)
50 (push (pop list) out)))
52 (nconc (nreverse out) list)
55 (defun gnus-set-difference (list1 list2)
56 "Return a list of elements of LIST1 that do not appear in LIST2."
57 (let ((list1 (copy-sequence list1)))
59 (setq list1 (delq (car list2) list1))
60 (setq list2 (cdr list2)))
63 (defun gnus-sorted-complement (list1 list2)
64 "Return a list of elements that are in LIST1 or LIST2 but not both.
65 Both lists have to be sorted over <."
67 (if (or (null list1) (null list2))
69 (while (and list1 list2)
70 (cond ((= (car list1) (car list2))
71 (setq list1 (cdr list1)
73 ((< (car list1) (car list2))
74 (setq out (cons (car list1) out))
75 (setq list1 (cdr list1)))
77 (setq out (cons (car list2) out))
78 (setq list2 (cdr list2)))))
79 (nconc (nreverse out) (or list1 list2)))))
81 (defun gnus-intersection (list1 list2)
84 (when (memq (car list2) list1)
85 (setq result (cons (car list2) result)))
86 (setq list2 (cdr list2)))
89 (defun gnus-sorted-intersection (list1 list2)
90 ;; LIST1 and LIST2 have to be sorted over <.
92 (while (and list1 list2)
93 (cond ((= (car list1) (car list2))
94 (setq out (cons (car list1) out)
97 ((< (car list1) (car list2))
98 (setq list1 (cdr list1)))
100 (setq list2 (cdr list2)))))
103 (defun gnus-set-sorted-intersection (list1 list2)
104 ;; LIST1 and LIST2 have to be sorted over <.
105 ;; This function modifies LIST1.
106 (let* ((top (cons nil list1))
108 (while (and list1 list2)
109 (cond ((= (car list1) (car list2))
113 ((< (car list1) (car list2))
114 (setcdr prev (cdr list1))
115 (setq list1 (cdr list1)))
117 (setq list2 (cdr list2)))))
121 (defun gnus-compress-sequence (numbers &optional always-list)
122 "Convert list of numbers to a list of ranges or a single range.
123 If ALWAYS-LIST is non-nil, this function will always release a list of
125 (let* ((first (car numbers))
130 (if (not (listp (cdr numbers)))
133 (cond ((= last (car numbers)) nil) ;Omit duplicated number
134 ((= (1+ last) (car numbers)) ;Still in sequence
135 (setq last (car numbers)))
136 (t ;End of one sequence
138 (cons (if (= first last) first
141 (setq first (car numbers))
142 (setq last (car numbers))))
143 (setq numbers (cdr numbers)))
144 (if (and (not always-list) (null result))
145 (if (= first last) (list first) (cons first last))
146 (nreverse (cons (if (= first last) first (cons first last))
149 (defalias 'gnus-uncompress-sequence 'gnus-uncompress-range)
150 (defun gnus-uncompress-range (ranges)
151 "Expand a list of ranges into a list of numbers.
152 RANGES is either a single range on the form `(num . num)' or a list of
154 (let (first last result)
158 ((not (listp (cdr ranges)))
159 (setq first (car ranges))
160 (setq last (cdr ranges))
161 (while (<= first last)
162 (setq result (cons first result))
163 (setq first (1+ first)))
167 (if (atom (car ranges))
168 (when (numberp (car ranges))
169 (setq result (cons (car ranges) result)))
170 (setq first (caar ranges))
171 (setq last (cdar ranges))
172 (while (<= first last)
173 (setq result (cons first result))
174 (setq first (1+ first))))
175 (setq ranges (cdr ranges)))
176 (nreverse result)))))
178 (defun gnus-add-to-range (ranges list)
179 "Return a list of ranges that has all articles from both RANGES and LIST.
180 Note: LIST has to be sorted over `<'."
182 (gnus-compress-sequence list t)
183 (setq list (copy-sequence list))
184 (unless (listp (cdr ranges))
185 (setq ranges (list ranges)))
187 ilist lowest highest temp)
188 (while (and ranges list)
190 (setq lowest (or (and (atom (car ranges)) (car ranges))
192 (while (and list (cdr list) (< (cadr list) lowest))
193 (setq list (cdr list)))
194 (when (< (car ilist) lowest)
196 (setq list (cdr list))
198 (setq out (nconc (gnus-compress-sequence ilist t) out)))
199 (setq highest (or (and (atom (car ranges)) (car ranges))
201 (while (and list (<= (car list) highest))
202 (setq list (cdr list)))
203 (setq ranges (cdr ranges)))
205 (setq out (nconc (gnus-compress-sequence list t) out)))
206 (setq out (sort out (lambda (r1 r2)
207 (< (or (and (atom r1) r1) (car r1))
208 (or (and (atom r2) r2) (car r2))))))
211 (if (atom (car ranges))
213 (if (atom (cadr ranges))
214 (when (= (1+ (car ranges)) (cadr ranges))
215 (setcar ranges (cons (car ranges)
217 (setcdr ranges (cddr ranges)))
218 (when (= (1+ (car ranges)) (caadr ranges))
219 (setcar (cadr ranges) (car ranges))
220 (setcar ranges (cadr ranges))
221 (setcdr ranges (cddr ranges)))))
223 (if (atom (cadr ranges))
224 (when (= (1+ (cdar ranges)) (cadr ranges))
225 (setcdr (car ranges) (cadr ranges))
226 (setcdr ranges (cddr ranges)))
227 (when (= (1+ (cdar ranges)) (caadr ranges))
228 (setcdr (car ranges) (cdadr ranges))
229 (setcdr ranges (cddr ranges))))))
230 (setq ranges (cdr ranges)))
233 (defun gnus-remove-from-range (range1 range2)
234 "Return a range that has all articles from RANGE2 removed from RANGE1.
235 The returned range is always a list. RANGE2 can also be a unsorted
236 list of articles. RANGE1 is modified by side effects, RANGE2 is not
238 (if (or (null range1) (null range2))
240 (let (out r1 r2 r1_min r1_max r2_min r2_max
241 (range2 (gnus-copy-sequence range2)))
242 (setq range1 (if (listp (cdr range1)) range1 (list range1))
243 range2 (sort (if (listp (cdr range2)) range2 (list range2))
245 (< (if (consp e1) (car e1) e1)
246 (if (consp e2) (car e2) e2))))
249 r1_min (if (consp r1) (car r1) r1)
250 r1_max (if (consp r1) (cdr r1) r1)
251 r2_min (if (consp r2) (car r2) r2)
252 r2_max (if (consp r2) (cdr r2) r2))
253 (while (and range1 range2)
254 (cond ((< r2_max r1_min) ; r2 < r1
256 (setq r2 (car range2)
257 r2_min (if (consp r2) (car r2) r2)
258 r2_max (if (consp r2) (cdr r2) r2)))
259 ((and (<= r2_min r1_min) (<= r1_max r2_max)) ; r2 overlap r1
261 (setq r1 (car range1)
262 r1_min (if (consp r1) (car r1) r1)
263 r1_max (if (consp r1) (cdr r1) r1)))
264 ((and (<= r2_min r1_min) (<= r2_max r1_max)) ; r2 overlap min r1
266 (setq r1_min (1+ r2_max)
268 r2_min (if (consp r2) (car r2) r2)
269 r2_max (if (consp r2) (cdr r2) r2)))
270 ((and (<= r1_min r2_min) (<= r2_max r1_max)) ; r2 contained in r1
271 (if (eq r1_min (1- r2_min))
273 (push (cons r1_min (1- r2_min)) out))
275 (if (< r2_max r1_max) ; finished with r1?
276 (setq r1_min (1+ r2_max))
278 (setq r1 (car range1)
279 r1_min (if (consp r1) (car r1) r1)
280 r1_max (if (consp r1) (cdr r1) r1)))
281 (setq r2 (car range2)
282 r2_min (if (consp r2) (car r2) r2)
283 r2_max (if (consp r2) (cdr r2) r2)))
284 ((and (<= r2_min r1_max) (<= r1_max r2_max)) ; r2 overlap max r1
285 (if (eq r1_min (1- r2_min))
287 (push (cons r1_min (1- r2_min)) out))
289 (setq r1 (car range1)
290 r1_min (if (consp r1) (car r1) r1)
291 r1_max (if (consp r1) (cdr r1) r1)))
292 ((< r1_max r2_min) ; r2 > r1
294 (if (eq r1_min r1_max)
296 (push (cons r1_min r1_max) out))
297 (setq r1 (car range1)
298 r1_min (if (consp r1) (car r1) r1)
299 r1_max (if (consp r1) (cdr r1) r1)))))
301 (if (eq r1_min r1_max)
303 (push (cons r1_min r1_max) out))
306 (push (pop range1) out))
309 (defun gnus-member-of-range (number ranges)
310 (if (not (listp (cdr ranges)))
311 (and (>= number (car ranges))
312 (<= number (cdr ranges)))
315 (if (numberp (car ranges))
316 (>= number (car ranges))
317 (>= number (caar ranges)))
319 (when (if (numberp (car ranges))
320 (= number (car ranges))
321 (and (>= number (caar ranges))
322 (<= number (cdar ranges))))
324 (setq ranges (cdr ranges)))
327 (defun gnus-range-length (range)
328 "Return the length RANGE would have if uncompressed."
329 (length (gnus-uncompress-range range)))
331 (defun gnus-sublist-p (list sublist)
332 "Test whether all elements in SUBLIST are members of LIST."
335 (unless (memq (pop sublist) list)
340 (defun gnus-range-add (range1 range2)
341 "Add RANGE2 to RANGE1 (nondestructively)."
342 (unless (listp (cdr range1))
343 (setq range1 (list range1)))
344 (unless (listp (cdr range2))
345 (setq range2 (list range2)))
346 (let ((item1 (pop range1))
349 (while (or item1 item2)
354 ((and (numberp item1) (numberp item2)) (< item1 item2))
355 ((numberp item1) (< item1 (car item2)))
356 ((numberp item2) (< (car item1) item2))
357 (t (< (car item1) (car item2)))))
360 (let ((tmp1 item) (tmp2 (if selector item1 item2)))
364 ((and (numberp tmp1) (numberp tmp2))
366 ((eq tmp1 tmp2) tmp1)
367 ((eq (1+ tmp1) tmp2) (cons tmp1 tmp2))
368 ((eq (1+ tmp2) tmp1) (cons tmp2 tmp1))
372 ((and (>= tmp1 (car tmp2)) (<= tmp1 (cdr tmp2))) tmp2)
373 ((eq (1+ tmp1) (car tmp2)) (cons tmp1 (cdr tmp2)))
374 ((eq (1- tmp1) (cdr tmp2)) (cons (car tmp2) tmp1))
378 ((and (>= tmp2 (car tmp1)) (<= tmp2 (cdr tmp1))) tmp1)
379 ((eq (1+ tmp2) (car tmp1)) (cons tmp2 (cdr tmp1)))
380 ((eq (1- tmp2) (cdr tmp1)) (cons (car tmp1) tmp2))
382 ((< (1+ (cdr tmp1)) (car tmp2)) nil)
383 ((< (1+ (cdr tmp2)) (car tmp1)) nil)
384 (t (cons (min (car tmp1) (car tmp2))
385 (max (cdr tmp1) (cdr tmp2))))))
387 (if item (push item range))
388 (if selector item1 item2))))
390 (setq item1 (pop range1))
391 (setq item2 (pop range2))))
392 (if item (push item range))
395 (provide 'gnus-range)
397 ;;; gnus-range.el ends here