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a8581027 | 1 | ;;; format.el --- read and save files in multiple formats |
b578f267 | 2 | |
7bfd055d GM |
3 | ;; Copyright (C) 1994, 1995, 1997, 1999, 2001, 2002, 2003, 2004, 2005, |
4 | ;; 2006, 2007, 2008, 2009 Free Software Foundation, Inc. | |
029894b9 | 5 | |
823139fb | 6 | ;; Author: Boris Goldowsky <boris@gnu.org> |
029894b9 BG |
7 | |
8 | ;; This file is part of GNU Emacs. | |
9 | ||
eb3fa2cf | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
029894b9 | 11 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
b578f267 | 14 | |
029894b9 BG |
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. | |
b578f267 | 19 | |
029894b9 | 20 | ;; You should have received a copy of the GNU General Public License |
eb3fa2cf | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
029894b9 BG |
22 | |
23 | ;;; Commentary: | |
b578f267 EN |
24 | |
25 | ;; This file defines a unified mechanism for saving & loading files stored | |
26 | ;; in different formats. `format-alist' contains information that directs | |
029894b9 | 27 | ;; Emacs to call an encoding or decoding function when reading or writing |
823139fb | 28 | ;; files that match certain conditions. |
029894b9 | 29 | ;; |
b578f267 EN |
30 | ;; When a file is visited, its format is determined by matching the |
31 | ;; beginning of the file against regular expressions stored in | |
32 | ;; `format-alist'. If this fails, you can manually translate the buffer | |
33 | ;; using `format-decode-buffer'. In either case, the formats used are | |
34 | ;; listed in the variable `buffer-file-format', and become the default | |
35 | ;; format for saving the buffer. To save a buffer in a different format, | |
36 | ;; change this variable, or use `format-write-file'. | |
029894b9 BG |
37 | ;; |
38 | ;; Auto-save files are normally created in the same format as the visited | |
4a2255ad | 39 | ;; file, but the variable `buffer-auto-save-file-format' can be set to a |
b578f267 EN |
40 | ;; particularly fast or otherwise preferred format to be used for |
41 | ;; auto-saving (or nil to do no encoding on auto-save files, but then you | |
42 | ;; risk losing any text-properties in the buffer). | |
029894b9 | 43 | ;; |
b578f267 EN |
44 | ;; You can manually translate a buffer into or out of a particular format |
45 | ;; with the functions `format-encode-buffer' and `format-decode-buffer'. | |
46 | ;; To translate just the region use the functions `format-encode-region' | |
823139fb | 47 | ;; and `format-decode-region'. |
029894b9 | 48 | ;; |
b578f267 EN |
49 | ;; You can define a new format by writing the encoding and decoding |
50 | ;; functions, and adding an entry to `format-alist'. See enriched.el for | |
51 | ;; an example of how to implement a file format. There are various | |
52 | ;; functions defined in this file that may be useful for writing the | |
53 | ;; encoding and decoding functions: | |
54 | ;; * `format-annotate-region' and `format-deannotate-region' allow a | |
55 | ;; single alist of information to be used for encoding and decoding. | |
56 | ;; The alist defines a correspondence between strings in the file | |
57 | ;; ("annotations") and text-properties in the buffer. | |
029894b9 BG |
58 | ;; * `format-replace-strings' is similarly useful for doing simple |
59 | ;; string->string translations in a reversible manner. | |
60 | ||
b578f267 EN |
61 | ;;; Code: |
62 | ||
029894b9 | 63 | (put 'buffer-file-format 'permanent-local t) |
4a2255ad | 64 | (put 'buffer-auto-save-file-format 'permanent-local t) |
029894b9 | 65 | |
823139fb | 66 | (defvar format-alist |
8d0dd9d2 | 67 | '((text/enriched "Extended MIME text/enriched format." |
029894b9 BG |
68 | "Content-[Tt]ype:[ \t]*text/enriched" |
69 | enriched-decode enriched-encode t enriched-mode) | |
c84cf2bf | 70 | (plain "ISO 8859-1 standard format, no text properties." |
029894b9 BG |
71 | ;; Plain only exists so that there is an obvious neutral choice in |
72 | ;; the completion list. | |
c84cf2bf | 73 | nil nil nil nil nil) |
823139fb DL |
74 | (TeX "TeX (encoding)" |
75 | nil | |
c84cf2bf | 76 | iso-tex2iso iso-iso2tex t nil) |
823139fb DL |
77 | (gtex "German TeX (encoding)" |
78 | nil | |
c84cf2bf | 79 | iso-gtex2iso iso-iso2gtex t nil) |
f1d6fe69 | 80 | (html "HTML/SGML \"ISO 8879:1986//ENTITIES Added Latin 1//EN\" (encoding)" |
823139fb | 81 | nil |
f1d6fe69 | 82 | iso-sgml2iso iso-iso2sgml t nil) |
823139fb DL |
83 | (rot13 "rot13" |
84 | nil | |
c84cf2bf | 85 | "tr a-mn-z n-za-m" "tr a-mn-z n-za-m" t nil) |
823139fb DL |
86 | (duden "Duden Ersatzdarstellung" |
87 | nil | |
88 | "diac" iso-iso2duden t nil) | |
89 | (de646 "German ASCII (ISO 646)" | |
90 | nil | |
271af233 | 91 | "recode -f iso646-ge:latin1" "recode -f latin1:iso646-ge" t nil) |
823139fb DL |
92 | (denet "net German" |
93 | nil | |
c84cf2bf | 94 | iso-german iso-cvt-read-only t nil) |
823139fb DL |
95 | (esnet "net Spanish" |
96 | nil | |
8d0dd9d2 | 97 | iso-spanish iso-cvt-read-only t nil)) |
029894b9 | 98 | "List of information about understood file formats. |
ce44e932 GM |
99 | Elements are of the form |
100 | \(NAME DOC-STR REGEXP FROM-FN TO-FN MODIFY MODE-FN PRESERVE). | |
d1ae737b | 101 | |
029894b9 | 102 | NAME is a symbol, which is stored in `buffer-file-format'. |
d1ae737b | 103 | |
029894b9 BG |
104 | DOC-STR should be a single line providing more information about the |
105 | format. It is currently unused, but in the future will be shown to | |
106 | the user if they ask for more information. | |
d1ae737b | 107 | |
029894b9 | 108 | REGEXP is a regular expression to match against the beginning of the file; |
7bfd055d GM |
109 | it should match only files in that format. REGEXP may be nil, in |
110 | which case the format will never be applied automatically to a file. | |
111 | Use this for formats that you only ever want to apply manually. | |
d1ae737b | 112 | |
12008438 | 113 | FROM-FN is called to decode files in that format; it takes two args, BEGIN |
029894b9 BG |
114 | and END, and can make any modifications it likes, returning the new |
115 | end. It must make sure that the beginning of the file no longer | |
116 | matches REGEXP, or else it will get called again. | |
d1ae737b RS |
117 | Alternatively, FROM-FN can be a string, which specifies a shell command |
118 | (including options) to be used as a filter to perform the conversion. | |
119 | ||
12008438 | 120 | TO-FN is called to encode a region into that format; it takes three |
d1abb42f RS |
121 | arguments: BEGIN, END, and BUFFER. BUFFER is the original buffer that |
122 | the data being written came from, which the function could use, for | |
123 | example, to find the values of local variables. TO-FN should either | |
124 | return a list of annotations like `write-region-annotate-functions', | |
125 | or modify the region and return the new end. | |
d1ae737b RS |
126 | Alternatively, TO-FN can be a string, which specifies a shell command |
127 | (including options) to be used as a filter to perform the conversion. | |
128 | ||
d1abb42f RS |
129 | MODIFY, if non-nil, means the TO-FN wants to modify the region. If nil, |
130 | TO-FN will not make any changes but will instead return a list of | |
823139fb | 131 | annotations. |
d1ae737b | 132 | |
3e224645 EZ |
133 | MODE-FN, if specified, is called when visiting a file with that format. |
134 | It is called with a single positive argument, on the assumption | |
12008438 | 135 | that this would turn on some minor mode. |
34f30f79 RS |
136 | |
137 | PRESERVE, if non-nil, means that `format-write-file' should not remove | |
ec8dda2f | 138 | this format from `buffer-file-format'.") |
029894b9 BG |
139 | |
140 | ;;; Basic Functions (called from Lisp) | |
141 | ||
c84cf2bf | 142 | (defun format-encode-run-method (method from to &optional buffer) |
12008438 TTN |
143 | "Translate using METHOD the text from FROM to TO. |
144 | If METHOD is a string, it is a shell command (including options); | |
c84cf2bf RS |
145 | otherwise, it should be a Lisp function. |
146 | BUFFER should be the buffer that the output originally came from." | |
147 | (if (stringp method) | |
823139fb | 148 | (let ((error-buff (get-buffer-create "*Format Errors*")) |
7cc45a35 | 149 | (coding-system-for-read 'no-conversion) |
823139fb DL |
150 | format-alist) |
151 | (with-current-buffer error-buff | |
152 | (widen) | |
153 | (erase-buffer)) | |
10fa0073 GM |
154 | (if (and (zerop (save-window-excursion |
155 | (shell-command-on-region from to method t t | |
156 | error-buff))) | |
823139fb DL |
157 | ;; gzip gives zero exit status with bad args, for instance. |
158 | (zerop (with-current-buffer error-buff | |
159 | (buffer-size)))) | |
160 | (bury-buffer error-buff) | |
161 | (switch-to-buffer-other-window error-buff) | |
10fa0073 | 162 | (error "Format encoding failed"))) |
c84cf2bf RS |
163 | (funcall method from to buffer))) |
164 | ||
165 | (defun format-decode-run-method (method from to &optional buffer) | |
12008438 TTN |
166 | "Decode using METHOD the text from FROM to TO. |
167 | If METHOD is a string, it is a shell command (including options); otherwise, | |
168 | it should be a Lisp function. Decoding is done for the given BUFFER." | |
c84cf2bf | 169 | (if (stringp method) |
823139fb | 170 | (let ((error-buff (get-buffer-create "*Format Errors*")) |
7cc45a35 | 171 | (coding-system-for-write 'no-conversion) |
823139fb DL |
172 | format-alist) |
173 | (with-current-buffer error-buff | |
174 | (widen) | |
175 | (erase-buffer)) | |
176 | ;; We should perhaps go via a temporary buffer and copy it | |
177 | ;; back, in case of errors. | |
178 | (if (and (zerop (save-window-excursion | |
179 | (shell-command-on-region (point-min) (point-max) | |
180 | method t t | |
181 | error-buff))) | |
182 | ;; gzip gives zero exit status with bad args, for instance. | |
183 | (zerop (with-current-buffer error-buff | |
184 | (buffer-size)))) | |
185 | (bury-buffer error-buff) | |
186 | (switch-to-buffer-other-window error-buff) | |
187 | (error "Format decoding failed")) | |
c84cf2bf RS |
188 | (point)) |
189 | (funcall method from to))) | |
190 | ||
10fa0073 | 191 | (defun format-annotate-function (format from to orig-buf format-count) |
823139fb | 192 | "Return annotations for writing region as FORMAT. |
12008438 TTN |
193 | FORMAT is a symbol naming one of the formats defined in `format-alist'. |
194 | It must be a single symbol, not a list like `buffer-file-format'. | |
d1abb42f RS |
195 | FROM and TO delimit the region to be operated on in the current buffer. |
196 | ORIG-BUF is the original buffer that the data came from. | |
10fa0073 GM |
197 | |
198 | FORMAT-COUNT is an integer specifying how many times this function has | |
199 | been called in the process of decoding ORIG-BUF. | |
200 | ||
12008438 | 201 | This function works like a function in `write-region-annotate-functions': |
029894b9 | 202 | it either returns a list of annotations, or returns with a different buffer |
10fa0073 GM |
203 | current, which contains the modified text to write. In the latter case, |
204 | this function's value is nil. | |
029894b9 BG |
205 | |
206 | For most purposes, consider using `format-encode-region' instead." | |
10fa0073 GM |
207 | ;; This function is called by write-region (actually |
208 | ;; build_annotations) for each element of buffer-file-format. | |
029894b9 BG |
209 | (let* ((info (assq format format-alist)) |
210 | (to-fn (nth 4 info)) | |
211 | (modify (nth 5 info))) | |
212 | (if to-fn | |
213 | (if modify | |
214 | ;; To-function wants to modify region. Copy to safe place. | |
10fa0073 | 215 | (let ((copy-buf (get-buffer-create (format " *Format Temp %d*" |
8a2f1176 RS |
216 | format-count))) |
217 | (sel-disp selective-display) | |
5258c763 JB |
218 | (multibyte enable-multibyte-characters) |
219 | (coding-system buffer-file-coding-system)) | |
8a2f1176 | 220 | (with-current-buffer copy-buf |
1d1cf99f CY |
221 | (set (make-local-variable |
222 | 'write-region-post-annotation-function) | |
223 | 'kill-buffer) | |
8a2f1176 | 224 | (setq selective-display sel-disp) |
5258c763 JB |
225 | (set-buffer-multibyte multibyte) |
226 | (setq buffer-file-coding-system coding-system)) | |
029894b9 BG |
227 | (copy-to-buffer copy-buf from to) |
228 | (set-buffer copy-buf) | |
229 | (format-insert-annotations write-region-annotations-so-far from) | |
c84cf2bf | 230 | (format-encode-run-method to-fn (point-min) (point-max) orig-buf) |
029894b9 BG |
231 | nil) |
232 | ;; Otherwise just call function, it will return annotations. | |
d1abb42f | 233 | (funcall to-fn from to orig-buf))))) |
029894b9 BG |
234 | |
235 | (defun format-decode (format length &optional visit-flag) | |
236 | ;; This function is called by insert-file-contents whenever a file is read. | |
237 | "Decode text from any known FORMAT. | |
823139fb | 238 | FORMAT is a symbol appearing in `format-alist' or a list of such symbols, |
029894b9 BG |
239 | or nil, in which case this function tries to guess the format of the data by |
240 | matching against the regular expressions in `format-alist'. After a match is | |
241 | found and the region decoded, the alist is searched again from the beginning | |
242 | for another match. | |
243 | ||
244 | Second arg LENGTH is the number of characters following point to operate on. | |
245 | If optional third arg VISIT-FLAG is true, set `buffer-file-format' | |
be227f22 SM |
246 | to the reverted list of formats used, and call any mode functions defined |
247 | for those formats. | |
029894b9 | 248 | |
12008438 | 249 | Return the new length of the decoded region. |
029894b9 BG |
250 | |
251 | For most purposes, consider using `format-decode-region' instead." | |
252 | (let ((mod (buffer-modified-p)) | |
10fa0073 | 253 | (begin (point)) |
029894b9 | 254 | (end (+ (point) length))) |
10fa0073 GM |
255 | (unwind-protect |
256 | (progn | |
257 | ;; Don't record undo information for the decoding. | |
71296446 | 258 | |
10fa0073 GM |
259 | (if (null format) |
260 | ;; Figure out which format it is in, remember list in `format'. | |
261 | (let ((try format-alist)) | |
262 | (while try | |
263 | (let* ((f (car try)) | |
264 | (regexp (nth 2 f)) | |
265 | (p (point))) | |
266 | (if (and regexp (looking-at regexp) | |
267 | (< (match-end 0) (+ begin length))) | |
268 | (progn | |
be227f22 | 269 | (push (car f) format) |
10fa0073 GM |
270 | ;; Decode it |
271 | (if (nth 3 f) | |
272 | (setq end (format-decode-run-method (nth 3 f) begin end))) | |
273 | ;; Call visit function if required | |
274 | (if (and visit-flag (nth 6 f)) (funcall (nth 6 f) 1)) | |
275 | ;; Safeguard against either of the functions changing pt. | |
276 | (goto-char p) | |
277 | ;; Rewind list to look for another format | |
278 | (setq try format-alist)) | |
279 | (setq try (cdr try)))))) | |
280 | ;; Deal with given format(s) | |
281 | (or (listp format) (setq format (list format))) | |
282 | (let ((do format) f) | |
283 | (while do | |
284 | (or (setq f (assq (car do) format-alist)) | |
6b61353c | 285 | (error "Unknown format %s" (car do))) |
10fa0073 GM |
286 | ;; Decode: |
287 | (if (nth 3 f) | |
288 | (setq end (format-decode-run-method (nth 3 f) begin end))) | |
289 | ;; Call visit function if required | |
290 | (if (and visit-flag (nth 6 f)) (funcall (nth 6 f) 1)) | |
be227f22 SM |
291 | (setq do (cdr do)))) |
292 | ;; Encode in the opposite order. | |
293 | (setq format (reverse format))) | |
10fa0073 GM |
294 | (if visit-flag |
295 | (setq buffer-file-format format))) | |
71296446 | 296 | |
021cfbea GM |
297 | (set-buffer-modified-p mod)) |
298 | ||
10fa0073 | 299 | ;; Return new length of region |
029894b9 BG |
300 | (- end begin))) |
301 | ||
302 | ;;; | |
303 | ;;; Interactive functions & entry points | |
304 | ;;; | |
305 | ||
306 | (defun format-decode-buffer (&optional format) | |
307 | "Translate the buffer from some FORMAT. | |
12008438 TTN |
308 | If the format is not specified, attempt a regexp-based guess. |
309 | Set `buffer-file-format' to the format used, and call any | |
310 | format-specific mode functions." | |
029894b9 | 311 | (interactive |
5b76833f | 312 | (list (format-read "Translate buffer from format (default guess): "))) |
029894b9 BG |
313 | (save-excursion |
314 | (goto-char (point-min)) | |
315 | (format-decode format (buffer-size) t))) | |
316 | ||
317 | (defun format-decode-region (from to &optional format) | |
318 | "Decode the region from some format. | |
319 | Arg FORMAT is optional; if omitted the format will be determined by looking | |
320 | for identifying regular expressions at the beginning of the region." | |
321 | (interactive | |
823139fb | 322 | (list (region-beginning) (region-end) |
5b76833f | 323 | (format-read "Translate region from format (default guess): "))) |
029894b9 BG |
324 | (save-excursion |
325 | (goto-char from) | |
326 | (format-decode format (- to from) nil))) | |
327 | ||
328 | (defun format-encode-buffer (&optional format) | |
329 | "Translate the buffer into FORMAT. | |
330 | FORMAT defaults to `buffer-file-format'. It is a symbol naming one of the | |
331 | formats defined in `format-alist', or a list of such symbols." | |
332 | (interactive | |
333 | (list (format-read (format "Translate buffer to format (default %s): " | |
334 | buffer-file-format)))) | |
335 | (format-encode-region (point-min) (point-max) format)) | |
336 | ||
337 | (defun format-encode-region (beg end &optional format) | |
823139fb | 338 | "Translate the region into some FORMAT. |
12008438 | 339 | FORMAT defaults to `buffer-file-format'. It is a symbol naming |
029894b9 | 340 | one of the formats defined in `format-alist', or a list of such symbols." |
823139fb DL |
341 | (interactive |
342 | (list (region-beginning) (region-end) | |
343 | (format-read (format "Translate region to format (default %s): " | |
344 | buffer-file-format)))) | |
345 | (if (null format) (setq format buffer-file-format)) | |
346 | (if (symbolp format) (setq format (list format))) | |
347 | (save-excursion | |
348 | (goto-char end) | |
349 | (let ((cur-buf (current-buffer)) | |
350 | (end (point-marker))) | |
351 | (while format | |
352 | (let* ((info (assq (car format) format-alist)) | |
353 | (to-fn (nth 4 info)) | |
354 | (modify (nth 5 info)) | |
355 | result) | |
356 | (if to-fn | |
357 | (if modify | |
358 | (setq end (format-encode-run-method to-fn beg end | |
359 | (current-buffer))) | |
360 | (format-insert-annotations | |
361 | (funcall to-fn beg end (current-buffer))))) | |
362 | (setq format (cdr format))))))) | |
029894b9 | 363 | |
6b61353c | 364 | (defun format-write-file (filename format &optional confirm) |
84da0f17 GM |
365 | "Write current buffer into FILENAME, using a format based on FORMAT. |
366 | Constructs the actual format starting from FORMAT, then appending | |
367 | any elements from the value of `buffer-file-format' with a non-nil | |
368 | `preserve' flag (see the documentation of `format-alist'), if they | |
369 | are not already present in FORMAT. It then updates `buffer-file-format' | |
370 | with this format, making it the default for future saves. | |
371 | ||
372 | If the buffer is already visiting a file, you can specify a | |
373 | directory name as FILENAME, to write a file of the same old name | |
08d55d13 | 374 | in that directory. |
6b61353c | 375 | |
84da0f17 GM |
376 | If optional third arg CONFIRM is non-nil, asks for confirmation before |
377 | overwriting an existing file. Interactively, requires confirmation | |
378 | unless you supply a prefix argument." | |
029894b9 BG |
379 | (interactive |
380 | ;; Same interactive spec as write-file, plus format question. | |
381 | (let* ((file (if buffer-file-name | |
382 | (read-file-name "Write file: " | |
383 | nil nil nil nil) | |
384 | (read-file-name "Write file: " | |
385 | (cdr (assq 'default-directory | |
386 | (buffer-local-variables))) | |
387 | nil nil (buffer-name)))) | |
823139fb | 388 | (fmt (format-read (format "Write file `%s' in format: " |
029894b9 | 389 | (file-name-nondirectory file))))) |
6b61353c | 390 | (list file fmt (not current-prefix-arg)))) |
34f30f79 RS |
391 | (let ((old-formats buffer-file-format) |
392 | preserve-formats) | |
393 | (dolist (fmt old-formats) | |
394 | (let ((aelt (assq fmt format-alist))) | |
395 | (if (nth 7 aelt) | |
396 | (push fmt preserve-formats)))) | |
397 | (setq buffer-file-format format) | |
398 | (dolist (fmt preserve-formats) | |
399 | (unless (memq fmt buffer-file-format) | |
400 | (setq buffer-file-format (append buffer-file-format (list fmt)))))) | |
6b61353c | 401 | (write-file filename confirm)) |
029894b9 | 402 | |
ce6af52b | 403 | (defun format-find-file (filename format) |
823139fb | 404 | "Find the file FILENAME using data format FORMAT. |
ce6af52b KH |
405 | If FORMAT is nil then do not do any format conversion." |
406 | (interactive | |
407 | ;; Same interactive spec as write-file, plus format question. | |
408 | (let* ((file (read-file-name "Find file: ")) | |
823139fb | 409 | (fmt (format-read (format "Read file `%s' in format: " |
ce6af52b KH |
410 | (file-name-nondirectory file))))) |
411 | (list file fmt))) | |
412 | (let ((format-alist nil)) | |
413 | (find-file filename)) | |
414 | (if format | |
415 | (format-decode-buffer format))) | |
416 | ||
417 | (defun format-insert-file (filename format &optional beg end) | |
823139fb | 418 | "Insert the contents of file FILENAME using data format FORMAT. |
ce6af52b KH |
419 | If FORMAT is nil then do not do any format conversion. |
420 | The optional third and fourth arguments BEG and END specify | |
12008438 | 421 | the part (in bytes) of the file to read. |
ce6af52b KH |
422 | |
423 | The return value is like the value of `insert-file-contents': | |
6b61353c | 424 | a list (ABSOLUTE-FILE-NAME SIZE)." |
ce6af52b KH |
425 | (interactive |
426 | ;; Same interactive spec as write-file, plus format question. | |
427 | (let* ((file (read-file-name "Find file: ")) | |
823139fb | 428 | (fmt (format-read (format "Read file `%s' in format: " |
ce6af52b KH |
429 | (file-name-nondirectory file))))) |
430 | (list file fmt))) | |
f70aa678 MR |
431 | (let (value size old-undo) |
432 | ;; Record only one undo entry for the insertion. Inhibit point-motion and | |
433 | ;; modification hooks as with `insert-file-contents'. | |
434 | (let ((inhibit-point-motion-hooks t) | |
435 | (inhibit-modification-hooks t)) | |
436 | ;; Don't bind `buffer-undo-list' to t here to assert that | |
437 | ;; `insert-file-contents' may record whether the buffer was unmodified | |
438 | ;; before. | |
439 | (let ((format-alist nil)) | |
440 | (setq value (insert-file-contents filename nil beg end)) | |
441 | (setq size (nth 1 value))) | |
442 | (when (consp buffer-undo-list) | |
443 | (let ((head (car buffer-undo-list))) | |
444 | (when (and (consp head) | |
445 | (equal (car head) (point)) | |
446 | (equal (cdr head) (+ (point) size))) | |
447 | ;; Remove first entry from `buffer-undo-list', we shall insert | |
448 | ;; another one below. | |
449 | (setq old-undo (cdr buffer-undo-list))))) | |
450 | (when format | |
451 | (let ((buffer-undo-list t)) | |
452 | (setq size (format-decode format size) | |
453 | value (list (car value) size))) | |
454 | (unless (eq buffer-undo-list t) | |
455 | (setq buffer-undo-list | |
456 | (cons (cons (point) (+ (point) size)) old-undo))))) | |
457 | (unless inhibit-modification-hooks | |
458 | (run-hook-with-args 'after-change-functions (point) (+ (point) size) 0)) | |
ce6af52b KH |
459 | value)) |
460 | ||
029894b9 BG |
461 | (defun format-read (&optional prompt) |
462 | "Read and return the name of a format. | |
463 | Return value is a list, like `buffer-file-format'; it may be nil. | |
464 | Formats are defined in `format-alist'. Optional arg is the PROMPT to use." | |
465 | (let* ((table (mapcar (lambda (x) (list (symbol-name (car x)))) | |
466 | format-alist)) | |
467 | (ans (completing-read (or prompt "Format: ") table nil t))) | |
468 | (if (not (equal "" ans)) (list (intern ans))))) | |
469 | ||
470 | ||
471 | ;;; | |
472 | ;;; Below are some functions that may be useful in writing encoding and | |
473 | ;;; decoding functions for use in format-alist. | |
474 | ;;; | |
475 | ||
476 | (defun format-replace-strings (alist &optional reverse beg end) | |
477 | "Do multiple replacements on the buffer. | |
d0fc7e3b | 478 | ALIST is a list of (FROM . TO) pairs, which should be proper arguments to |
12008438 TTN |
479 | `search-forward' and `replace-match', respectively. |
480 | Optional second arg REVERSE, if non-nil, means the pairs are (TO . FROM), | |
481 | so that you can use the same list in both directions if it contains only | |
482 | literal strings. | |
823139fb | 483 | Optional args BEG and END specify a region of the buffer on which to operate." |
029894b9 BG |
484 | (save-excursion |
485 | (save-restriction | |
486 | (or beg (setq beg (point-min))) | |
487 | (if end (narrow-to-region (point-min) end)) | |
488 | (while alist | |
489 | (let ((from (if reverse (cdr (car alist)) (car (car alist)))) | |
2c3ac81d | 490 | (to (if reverse (car (car alist)) (cdr (car alist))))) |
029894b9 BG |
491 | (goto-char beg) |
492 | (while (search-forward from nil t) | |
493 | (goto-char (match-beginning 0)) | |
494 | (insert to) | |
495 | (set-text-properties (- (point) (length to)) (point) | |
496 | (text-properties-at (point))) | |
497 | (delete-region (point) (+ (point) (- (match-end 0) | |
498 | (match-beginning 0))))) | |
499 | (setq alist (cdr alist))))))) | |
500 | ||
501 | ;;; Some list-manipulation functions that we need. | |
502 | ||
503 | (defun format-delq-cons (cons list) | |
823139fb DL |
504 | "Remove the given CONS from LIST by side effect and return the new LIST. |
505 | Since CONS could be the first element of LIST, write | |
506 | `\(setq foo \(format-delq-cons element foo))' to be sure of changing | |
507 | the value of `foo'." | |
029894b9 BG |
508 | (if (eq cons list) |
509 | (cdr list) | |
510 | (let ((p list)) | |
511 | (while (not (eq (cdr p) cons)) | |
e8af40ee | 512 | (if (null p) (error "format-delq-cons: not an element")) |
029894b9 BG |
513 | (setq p (cdr p))) |
514 | ;; Now (cdr p) is the cons to delete | |
515 | (setcdr p (cdr cons)) | |
516 | list))) | |
71296446 | 517 | |
029894b9 BG |
518 | (defun format-make-relatively-unique (a b) |
519 | "Delete common elements of lists A and B, return as pair. | |
12008438 | 520 | Compare using `equal'." |
029894b9 BG |
521 | (let* ((acopy (copy-sequence a)) |
522 | (bcopy (copy-sequence b)) | |
523 | (tail acopy)) | |
524 | (while tail | |
525 | (let ((dup (member (car tail) bcopy)) | |
526 | (next (cdr tail))) | |
527 | (if dup (setq acopy (format-delq-cons tail acopy) | |
528 | bcopy (format-delq-cons dup bcopy))) | |
529 | (setq tail next))) | |
530 | (cons acopy bcopy))) | |
531 | ||
532 | (defun format-common-tail (a b) | |
533 | "Given two lists that have a common tail, return it. | |
12008438 | 534 | Compare with `equal', and return the part of A that is equal to the |
029894b9 | 535 | equivalent part of B. If even the last items of the two are not equal, |
12008438 | 536 | return nil." |
029894b9 BG |
537 | (let ((la (length a)) |
538 | (lb (length b))) | |
539 | ;; Make sure they are the same length | |
823139fb | 540 | (if (> la lb) |
029894b9 BG |
541 | (setq a (nthcdr (- la lb) a)) |
542 | (setq b (nthcdr (- lb la) b)))) | |
543 | (while (not (equal a b)) | |
544 | (setq a (cdr a) | |
545 | b (cdr b))) | |
546 | a) | |
547 | ||
f0a6c717 GM |
548 | (defun format-proper-list-p (list) |
549 | "Return t if LIST is a proper list. | |
550 | A proper list is a list ending with a nil cdr, not with an atom " | |
551 | (when (listp list) | |
552 | (while (consp list) | |
553 | (setq list (cdr list))) | |
554 | (null list))) | |
555 | ||
029894b9 | 556 | (defun format-reorder (items order) |
12008438 TTN |
557 | "Arrange ITEMS to follow partial ORDER. |
558 | Elements of ITEMS equal to elements of ORDER will be rearranged | |
559 | to follow the ORDER. Unmatched items will go last." | |
029894b9 BG |
560 | (if order |
561 | (let ((item (member (car order) items))) | |
562 | (if item | |
823139fb | 563 | (cons (car item) |
029894b9 BG |
564 | (format-reorder (format-delq-cons item items) |
565 | (cdr order))) | |
566 | (format-reorder items (cdr order)))) | |
567 | items)) | |
568 | ||
569 | (put 'face 'format-list-valued t) ; These text-properties take values | |
570 | (put 'unknown 'format-list-valued t) ; that are lists, the elements of which | |
571 | ; should be considered separately. | |
572 | ; See format-deannotate-region and | |
573 | ; format-annotate-region. | |
574 | ||
f3bbef87 GM |
575 | ;; This text property has list values, but they are treated atomically. |
576 | ||
577 | (put 'display 'format-list-atomic-p t) | |
578 | ||
029894b9 BG |
579 | ;;; |
580 | ;;; Decoding | |
581 | ;;; | |
582 | ||
583 | (defun format-deannotate-region (from to translations next-fn) | |
584 | "Translate annotations in the region into text properties. | |
823139fb | 585 | This sets text properties between FROM to TO as directed by the |
029894b9 BG |
586 | TRANSLATIONS and NEXT-FN arguments. |
587 | ||
588 | NEXT-FN is a function that searches forward from point for an annotation. | |
589 | It should return a list of 4 elements: \(BEGIN END NAME POSITIVE). BEGIN and | |
590 | END are buffer positions bounding the annotation, NAME is the name searched | |
591 | for in TRANSLATIONS, and POSITIVE should be non-nil if this annotation marks | |
592 | the beginning of a region with some property, or nil if it ends the region. | |
593 | NEXT-FN should return nil if there are no annotations after point. | |
594 | ||
595 | The basic format of the TRANSLATIONS argument is described in the | |
596 | documentation for the `format-annotate-region' function. There are some | |
597 | additional things to keep in mind for decoding, though: | |
598 | ||
599 | When an annotation is found, the TRANSLATIONS list is searched for a | |
600 | text-property name and value that corresponds to that annotation. If the | |
601 | text-property has several annotations associated with it, it will be used only | |
602 | if the other annotations are also in effect at that point. The first match | |
603 | found whose annotations are all present is used. | |
604 | ||
605 | The text property thus determined is set to the value over the region between | |
606 | the opening and closing annotations. However, if the text-property name has a | |
607 | non-nil `format-list-valued' property, then the value will be consed onto the | |
608 | surrounding value of the property, rather than replacing that value. | |
609 | ||
610 | There are some special symbols that can be used in the \"property\" slot of | |
611 | the TRANSLATIONS list: PARAMETER and FUNCTION \(spelled in uppercase). | |
612 | Annotations listed under the pseudo-property PARAMETER are considered to be | |
613 | arguments of the immediately surrounding annotation; the text between the | |
614 | opening and closing parameter annotations is deleted from the buffer but saved | |
92308d3a RS |
615 | as a string. |
616 | ||
617 | The surrounding annotation should be listed under the pseudo-property | |
618 | FUNCTION. Instead of inserting a text-property for this annotation, | |
619 | the function listed in the VALUE slot is called to make whatever | |
620 | changes are appropriate. It can also return a list of the form | |
621 | \(START LOC PROP VALUE) which specifies a property to put on. The | |
622 | function's first two arguments are the START and END locations, and | |
623 | the rest of the arguments are any PARAMETERs found in that region. | |
029894b9 BG |
624 | |
625 | Any annotations that are found by NEXT-FN but not defined by TRANSLATIONS | |
626 | are saved as values of the `unknown' text-property \(which is list-valued). | |
627 | The TRANSLATIONS list should usually contain an entry of the form | |
628 | \(unknown \(nil format-annotate-value)) | |
629 | to write these unknown annotations back into the file." | |
630 | (save-excursion | |
631 | (save-restriction | |
632 | (narrow-to-region (point-min) to) | |
633 | (goto-char from) | |
634 | (let (next open-ans todo loc unknown-ans) | |
635 | (while (setq next (funcall next-fn)) | |
636 | (let* ((loc (nth 0 next)) | |
637 | (end (nth 1 next)) | |
638 | (name (nth 2 next)) | |
639 | (positive (nth 3 next)) | |
640 | (found nil)) | |
641 | ||
642 | ;; Delete the annotation | |
643 | (delete-region loc end) | |
22828206 RS |
644 | (cond |
645 | ;; Positive annotations are stacked, remembering location | |
be227f22 | 646 | (positive (push `(,name ((,loc . nil))) open-ans)) |
22828206 RS |
647 | ;; It is a negative annotation: |
648 | ;; Close the top annotation & add its text property. | |
649 | ;; If the file's nesting is messed up, the close might not match | |
650 | ;; the top thing on the open-annotations stack. | |
651 | ;; If no matching annotation is open, just ignore the close. | |
652 | ((not (assoc name open-ans)) | |
653 | (message "Extra closing annotation (%s) in file" name)) | |
654 | ;; If one is open, but not on the top of the stack, close | |
655 | ;; the things in between as well. Set `found' when the real | |
656 | ;; one is closed. | |
657 | (t | |
658 | (while (not found) | |
659 | (let* ((top (car open-ans)) ; first on stack: should match. | |
660 | (top-name (car top)) ; text property name | |
661 | (top-extents (nth 1 top)) ; property regions | |
662 | (params (cdr (cdr top))) ; parameters | |
663 | (aalist translations) | |
664 | (matched nil)) | |
665 | (if (equal name top-name) | |
666 | (setq found t) | |
667 | (message "Improper nesting in file.")) | |
668 | ;; Look through property names in TRANSLATIONS | |
669 | (while aalist | |
670 | (let ((prop (car (car aalist))) | |
671 | (alist (cdr (car aalist)))) | |
672 | ;; And look through values for each property | |
673 | (while alist | |
674 | (let ((value (car (car alist))) | |
675 | (ans (cdr (car alist)))) | |
676 | (if (member top-name ans) | |
677 | ;; This annotation is listed, but still have to | |
678 | ;; check if multiple annotations are satisfied | |
679 | (if (member nil (mapcar (lambda (r) | |
680 | (assoc r open-ans)) | |
681 | ans)) | |
682 | nil ; multiple ans not satisfied | |
683 | ;; If there are multiple annotations going | |
684 | ;; into one text property, split up the other | |
685 | ;; annotations so they apply individually to | |
686 | ;; the other regions. | |
687 | (setcdr (car top-extents) loc) | |
688 | (let ((to-split ans) this-one extents) | |
689 | (while to-split | |
690 | (setq this-one | |
691 | (assoc (car to-split) open-ans) | |
692 | extents (nth 1 this-one)) | |
693 | (if (not (eq this-one top)) | |
694 | (setcar (cdr this-one) | |
695 | (format-subtract-regions | |
696 | extents top-extents))) | |
697 | (setq to-split (cdr to-split)))) | |
698 | ;; Set loop variables to nil so loop | |
699 | ;; will exit. | |
700 | (setq alist nil aalist nil matched t | |
701 | ;; pop annotation off stack. | |
702 | open-ans (cdr open-ans)) | |
703 | (let ((extents top-extents) | |
704 | (start (car (car top-extents))) | |
705 | (loc (cdr (car top-extents)))) | |
706 | (while extents | |
707 | (cond | |
708 | ;; Check for pseudo-properties | |
709 | ((eq prop 'PARAMETER) | |
710 | ;; A parameter of the top open ann: | |
711 | ;; delete text and use as arg. | |
712 | (if open-ans | |
713 | ;; (If nothing open, discard). | |
714 | (setq open-ans | |
715 | (cons | |
716 | (append (car open-ans) | |
717 | (list | |
718 | (buffer-substring | |
719 | start loc))) | |
720 | (cdr open-ans)))) | |
721 | (delete-region start loc)) | |
722 | ((eq prop 'FUNCTION) | |
723 | ;; Not a property, but a function. | |
724 | (let ((rtn | |
725 | (apply value start loc params))) | |
be227f22 | 726 | (if rtn (push rtn todo)))) |
22828206 RS |
727 | (t |
728 | ;; Normal property/value pair | |
729 | (setq todo | |
730 | (cons (list start loc prop value) | |
731 | todo)))) | |
732 | (setq extents (cdr extents) | |
733 | start (car (car extents)) | |
734 | loc (cdr (car extents)))))))) | |
735 | (setq alist (cdr alist)))) | |
736 | (setq aalist (cdr aalist))) | |
737 | (if (not matched) | |
029894b9 BG |
738 | ;; Didn't find any match for the annotation: |
739 | ;; Store as value of text-property `unknown'. | |
22828206 RS |
740 | (let ((extents top-extents) |
741 | (start (car (car top-extents))) | |
0b140219 | 742 | (loc (or (cdr (car top-extents)) loc))) |
22828206 RS |
743 | (while extents |
744 | (setq open-ans (cdr open-ans) | |
745 | todo (cons (list start loc 'unknown top-name) | |
746 | todo) | |
747 | unknown-ans (cons name unknown-ans) | |
748 | extents (cdr extents) | |
749 | start (car (car extents)) | |
750 | loc (cdr (car extents)))))))))))) | |
029894b9 BG |
751 | |
752 | ;; Once entire file has been scanned, add the properties. | |
753 | (while todo | |
754 | (let* ((item (car todo)) | |
755 | (from (nth 0 item)) | |
756 | (to (nth 1 item)) | |
757 | (prop (nth 2 item)) | |
758 | (val (nth 3 item))) | |
22828206 RS |
759 | |
760 | (if (numberp val) ; add to ambient value if numeric | |
761 | (format-property-increment-region from to prop val 0) | |
762 | (put-text-property | |
029894b9 | 763 | from to prop |
22828206 | 764 | (cond ((get prop 'format-list-valued) ; value gets consed onto |
029894b9 BG |
765 | ; list-valued properties |
766 | (let ((prev (get-text-property from prop))) | |
767 | (cons val (if (listp prev) prev (list prev))))) | |
22828206 | 768 | (t val))))) ; normally, just set to val. |
029894b9 | 769 | (setq todo (cdr todo))) |
22828206 | 770 | |
029894b9 BG |
771 | (if unknown-ans |
772 | (message "Unknown annotations: %s" unknown-ans)))))) | |
773 | ||
22828206 | 774 | (defun format-subtract-regions (minu subtra) |
9c3054da | 775 | "Remove from the regions in MINUEND the regions in SUBTRAHEND. |
d0fc7e3b | 776 | A region is a dotted pair (FROM . TO). Both parameters are lists of |
823139fb DL |
777 | regions. Each list must contain nonoverlapping, noncontiguous |
778 | regions, in descending order. The result is also nonoverlapping, | |
779 | noncontiguous, and in descending order. The first element of MINUEND | |
780 | can have a cdr of nil, indicating that the end of that region is not | |
9c3054da JB |
781 | yet known. |
782 | ||
783 | \(fn MINUEND SUBTRAHEND)" | |
22828206 RS |
784 | (let* ((minuend (copy-alist minu)) |
785 | (subtrahend (copy-alist subtra)) | |
786 | (m (car minuend)) | |
787 | (s (car subtrahend)) | |
788 | results) | |
789 | (while (and minuend subtrahend) | |
823139fb | 790 | (cond |
22828206 RS |
791 | ;; The minuend starts after the subtrahend ends; keep it. |
792 | ((> (car m) (cdr s)) | |
be227f22 SM |
793 | (push m results) |
794 | (setq minuend (cdr minuend) | |
22828206 RS |
795 | m (car minuend))) |
796 | ;; The minuend extends beyond the end of the subtrahend. Chop it off. | |
797 | ((or (null (cdr m)) (> (cdr m) (cdr s))) | |
be227f22 | 798 | (push (cons (1+ (cdr s)) (cdr m)) results) |
22828206 RS |
799 | (setcdr m (cdr s))) |
800 | ;; The subtrahend starts after the minuend ends; throw it away. | |
801 | ((< (cdr m) (car s)) | |
802 | (setq subtrahend (cdr subtrahend) s (car subtrahend))) | |
803 | ;; The subtrahend extends beyond the end of the minuend. Chop it off. | |
804 | (t ;(<= (cdr m) (cdr s))) | |
805 | (if (>= (car m) (car s)) | |
806 | (setq minuend (cdr minuend) m (car minuend)) | |
807 | (setcdr m (1- (car s))) | |
808 | (setq subtrahend (cdr subtrahend) s (car subtrahend)))))) | |
809 | (nconc (nreverse results) minuend))) | |
810 | ||
811 | ;; This should probably go somewhere other than format.el. Then again, | |
812 | ;; indent.el has alter-text-property. NOTE: We can also use | |
813 | ;; next-single-property-change instead of text-property-not-all, but then | |
814 | ;; we have to see if we passed TO. | |
815 | (defun format-property-increment-region (from to prop delta default) | |
12008438 | 816 | "In the region from FROM to TO increment property PROP by amount DELTA. |
823139fb | 817 | DELTA may be negative. If property PROP is nil anywhere |
22828206 RS |
818 | in the region, it is treated as though it were DEFAULT." |
819 | (let ((cur from) val newval next) | |
820 | (while cur | |
821 | (setq val (get-text-property cur prop) | |
822 | newval (+ (or val default) delta) | |
823 | next (text-property-not-all cur to prop val)) | |
824 | (put-text-property cur (or next to) prop newval) | |
825 | (setq cur next)))) | |
826 | ||
029894b9 BG |
827 | ;;; |
828 | ;;; Encoding | |
829 | ;;; | |
830 | ||
831 | (defun format-insert-annotations (list &optional offset) | |
832 | "Apply list of annotations to buffer as `write-region' would. | |
12008438 | 833 | Insert each element of the given LIST of buffer annotations at its |
029894b9 BG |
834 | appropriate place. Use second arg OFFSET if the annotations' locations are |
835 | not relative to the beginning of the buffer: annotations will be inserted | |
9c3054da JB |
836 | at their location-OFFSET+1 \(ie, the offset is treated as the position of |
837 | the first character in the buffer)." | |
823139fb | 838 | (if (not offset) |
029894b9 BG |
839 | (setq offset 0) |
840 | (setq offset (1- offset))) | |
841 | (let ((l (reverse list))) | |
842 | (while l | |
843 | (goto-char (- (car (car l)) offset)) | |
844 | (insert (cdr (car l))) | |
845 | (setq l (cdr l))))) | |
846 | ||
847 | (defun format-annotate-value (old new) | |
0b1ce6ba | 848 | "Return OLD and NEW as a \(CLOSE . OPEN) annotation pair. |
029894b9 BG |
849 | Useful as a default function for TRANSLATIONS alist when the value of the text |
850 | property is the name of the annotation that you want to use, as it is for the | |
851 | `unknown' text property." | |
852 | (cons (if old (list old)) | |
853 | (if new (list new)))) | |
854 | ||
823139fb | 855 | (defun format-annotate-region (from to translations format-fn ignore) |
029894b9 | 856 | "Generate annotations for text properties in the region. |
12008438 | 857 | Search for changes between FROM and TO, and describe them with a list of |
029894b9 BG |
858 | annotations as defined by alist TRANSLATIONS and FORMAT-FN. IGNORE lists text |
859 | properties not to consider; any text properties that are neither ignored nor | |
860 | listed in TRANSLATIONS are warned about. | |
861 | If you actually want to modify the region, give the return value of this | |
862 | function to `format-insert-annotations'. | |
863 | ||
864 | Format of the TRANSLATIONS argument: | |
865 | ||
866 | Each element is a list whose car is a PROPERTY, and the following | |
d0fc7e3b RS |
867 | elements have the form (VALUE ANNOTATIONS...). |
868 | Whenever the property takes on the value VALUE, the annotations | |
029894b9 BG |
869 | \(as formatted by FORMAT-FN) are inserted into the file. |
870 | When the property stops having that value, the matching negated annotation | |
871 | will be inserted \(it may actually be closed earlier and reopened, if | |
823139fb | 872 | necessary, to keep proper nesting). |
029894b9 | 873 | |
d0fc7e3b | 874 | If VALUE is a list, then each element of the list is dealt with |
029894b9 BG |
875 | separately. |
876 | ||
877 | If a VALUE is numeric, then it is assumed that there is a single annotation | |
878 | and each occurrence of it increments the value of the property by that number. | |
879 | Thus, given the entry \(left-margin \(4 \"indent\")), if the left margin | |
880 | changes from 4 to 12, two <indent> annotations will be generated. | |
881 | ||
882 | If the VALUE is nil, then instead of annotations, a function should be | |
883 | specified. This function is used as a default: it is called for all | |
884 | transitions not explicitly listed in the table. The function is called with | |
885 | two arguments, the OLD and NEW values of the property. It should return | |
d0fc7e3b | 886 | a cons cell (CLOSE . OPEN) as `format-annotate-single-property-change' does. |
029894b9 | 887 | |
d0fc7e3b | 888 | The same TRANSLATIONS structure can be used in reverse for reading files." |
029894b9 BG |
889 | (let ((all-ans nil) ; All annotations - becomes return value |
890 | (open-ans nil) ; Annotations not yet closed | |
891 | (loc nil) ; Current location | |
892 | (not-found nil)) ; Properties that couldn't be saved | |
893 | (while (or (null loc) | |
894 | (and (setq loc (next-property-change loc nil to)) | |
895 | (< loc to))) | |
896 | (or loc (setq loc from)) | |
823139fb | 897 | (let* ((ans (format-annotate-location loc (= loc from) ignore translations)) |
029894b9 BG |
898 | (neg-ans (format-reorder (aref ans 0) open-ans)) |
899 | (pos-ans (aref ans 1)) | |
900 | (ignored (aref ans 2))) | |
901 | (setq not-found (append ignored not-found) | |
902 | ignore (append ignored ignore)) | |
903 | ;; First do the negative (closing) annotations | |
904 | (while neg-ans | |
905 | ;; Check if it's missing. This can happen (eg, a numeric property | |
906 | ;; going negative can generate closing annotations before there are | |
907 | ;; any open). Warn user & ignore. | |
908 | (if (not (member (car neg-ans) open-ans)) | |
909 | (message "Can't close %s: not open." (car neg-ans)) | |
910 | (while (not (equal (car neg-ans) (car open-ans))) | |
911 | ;; To close anno. N, need to first close ans 1 to N-1, | |
912 | ;; remembering to re-open them later. | |
be227f22 | 913 | (push (car open-ans) pos-ans) |
823139fb | 914 | (setq all-ans |
029894b9 BG |
915 | (cons (cons loc (funcall format-fn (car open-ans) nil)) |
916 | all-ans)) | |
917 | (setq open-ans (cdr open-ans))) | |
918 | ;; Now remove the one we're really interested in from open list. | |
919 | (setq open-ans (cdr open-ans)) | |
920 | ;; And put the closing annotation here. | |
be227f22 SM |
921 | (push (cons loc (funcall format-fn (car neg-ans) nil)) |
922 | all-ans)) | |
029894b9 BG |
923 | (setq neg-ans (cdr neg-ans))) |
924 | ;; Now deal with positive (opening) annotations | |
925 | (let ((p pos-ans)) | |
926 | (while pos-ans | |
be227f22 SM |
927 | (push (car pos-ans) open-ans) |
928 | (push (cons loc (funcall format-fn (car pos-ans) t)) | |
929 | all-ans) | |
029894b9 BG |
930 | (setq pos-ans (cdr pos-ans)))))) |
931 | ||
932 | ;; Close any annotations still open | |
933 | (while open-ans | |
823139fb | 934 | (setq all-ans |
029894b9 BG |
935 | (cons (cons to (funcall format-fn (car open-ans) nil)) |
936 | all-ans)) | |
937 | (setq open-ans (cdr open-ans))) | |
938 | (if not-found | |
939 | (message "These text properties could not be saved:\n %s" | |
940 | not-found)) | |
941 | (nreverse all-ans))) | |
942 | ||
943 | ;;; Internal functions for format-annotate-region. | |
944 | ||
823139fb DL |
945 | (defun format-annotate-location (loc all ignore translations) |
946 | "Return annotation(s) needed at location LOC. | |
9c3054da | 947 | This includes any properties that change between LOC - 1 and LOC. |
029894b9 BG |
948 | If ALL is true, don't look at previous location, but generate annotations for |
949 | all non-nil properties. | |
950 | Third argument IGNORE is a list of text-properties not to consider. | |
d0fc7e3b | 951 | Use the TRANSLATIONS alist (see `format-annotate-region' for doc). |
029894b9 BG |
952 | |
953 | Return value is a vector of 3 elements: | |
d0fc7e3b RS |
954 | 1. List of annotations to close |
955 | 2. List of annotations to open. | |
956 | 3. List of properties that were ignored or couldn't be annotated. | |
957 | ||
958 | The annotations in lists 1 and 2 need not be strings. | |
959 | They can be whatever the FORMAT-FN in `format-annotate-region' | |
960 | can handle. If that is `enriched-make-annotation', they can be | |
961 | either strings, or lists of the form (PARAMETER VALUE)." | |
029894b9 BG |
962 | (let* ((prev-loc (1- loc)) |
963 | (before-plist (if all nil (text-properties-at prev-loc))) | |
964 | (after-plist (text-properties-at loc)) | |
965 | p negatives positives prop props not-found) | |
966 | ;; make list of all property names involved | |
967 | (setq p before-plist) | |
968 | (while p | |
969 | (if (not (memq (car p) props)) | |
be227f22 | 970 | (push (car p) props)) |
029894b9 BG |
971 | (setq p (cdr (cdr p)))) |
972 | (setq p after-plist) | |
973 | (while p | |
974 | (if (not (memq (car p) props)) | |
be227f22 | 975 | (push (car p) props)) |
029894b9 BG |
976 | (setq p (cdr (cdr p)))) |
977 | ||
978 | (while props | |
be227f22 | 979 | (setq prop (pop props)) |
029894b9 BG |
980 | (if (memq prop ignore) |
981 | nil ; If it's been ignored before, ignore it now. | |
982 | (let ((before (if all nil (car (cdr (memq prop before-plist))))) | |
983 | (after (car (cdr (memq prop after-plist))))) | |
984 | (if (equal before after) | |
985 | nil ; no change; ignore | |
986 | (let ((result (format-annotate-single-property-change | |
823139fb | 987 | prop before after translations))) |
029894b9 | 988 | (if (not result) |
be227f22 | 989 | (push prop not-found) |
029894b9 BG |
990 | (setq negatives (nconc negatives (car result)) |
991 | positives (nconc positives (cdr result))))))))) | |
992 | (vector negatives positives not-found))) | |
993 | ||
d0fc7e3b | 994 | (defun format-annotate-single-property-change (prop old new translations) |
823139fb | 995 | "Return annotations for property PROP changing from OLD to NEW. |
d0fc7e3b RS |
996 | These are searched for in the translations alist TRANSLATIONS |
997 | (see `format-annotate-region' for the format). | |
12008438 TTN |
998 | If NEW does not appear in the list, but there is a default function, |
999 | then call that function. | |
1000 | Return a cons of the form (CLOSE . OPEN) | |
d0fc7e3b RS |
1001 | where CLOSE is a list of annotations to close |
1002 | and OPEN is a list of annotations to open. | |
1003 | ||
1004 | The annotations in CLOSE and OPEN need not be strings. | |
1005 | They can be whatever the FORMAT-FN in `format-annotate-region' | |
1006 | can handle. If that is `enriched-make-annotation', they can be | |
1007 | either strings, or lists of the form (PARAMETER VALUE)." | |
1008 | ||
1009 | (let ((prop-alist (cdr (assoc prop translations))) | |
029894b9 BG |
1010 | default) |
1011 | (if (not prop-alist) | |
1012 | nil | |
029894b9 | 1013 | ;; If either old or new is a list, have to treat both that way. |
f0a6c717 | 1014 | (if (and (or (listp old) (listp new)) |
f3bbef87 | 1015 | (not (get prop 'format-list-atomic-p))) |
f0a6c717 GM |
1016 | (if (or (not (format-proper-list-p old)) |
1017 | (not (format-proper-list-p new))) | |
1018 | (format-annotate-atomic-property-change prop-alist old new) | |
1019 | (let* ((old (if (listp old) old (list old))) | |
1020 | (new (if (listp new) new (list new))) | |
1021 | (tail (format-common-tail old new)) | |
1022 | close open) | |
1023 | (while old | |
1024 | (setq close | |
1025 | (append (car (format-annotate-atomic-property-change | |
1026 | prop-alist (car old) nil)) | |
1027 | close) | |
1028 | old (cdr old))) | |
1029 | (while new | |
1030 | (setq open | |
1031 | (append (cdr (format-annotate-atomic-property-change | |
1032 | prop-alist nil (car new))) | |
1033 | open) | |
1034 | new (cdr new))) | |
1035 | (format-make-relatively-unique close open))) | |
029894b9 BG |
1036 | (format-annotate-atomic-property-change prop-alist old new))))) |
1037 | ||
1038 | (defun format-annotate-atomic-property-change (prop-alist old new) | |
12008438 | 1039 | "Internal function to annotate a single property change. |
d0fc7e3b | 1040 | PROP-ALIST is the relevant element of a TRANSLATIONS list. |
029894b9 | 1041 | OLD and NEW are the values." |
e5a60108 RS |
1042 | (let (num-ann) |
1043 | ;; If old and new values are numbers, | |
1044 | ;; look for a number in PROP-ALIST. | |
5f525595 RS |
1045 | (if (and (or (null old) (numberp old)) |
1046 | (or (null new) (numberp new))) | |
e5a60108 RS |
1047 | (progn |
1048 | (setq num-ann prop-alist) | |
1049 | (while (and num-ann (not (numberp (car (car num-ann))))) | |
1050 | (setq num-ann (cdr num-ann))))) | |
1051 | (if num-ann | |
5f525595 | 1052 | ;; Numerical annotation - use difference |
34fbecde RS |
1053 | (progn |
1054 | ;; If property is numeric, nil means 0 | |
1055 | (cond ((and (numberp old) (null new)) | |
1056 | (setq new 0)) | |
1057 | ((and (numberp new) (null old)) | |
1058 | (setq old 0))) | |
1059 | ||
1060 | (let* ((entry (car num-ann)) | |
1061 | (increment (car entry)) | |
1062 | (n (ceiling (/ (float (- new old)) (float increment)))) | |
1063 | (anno (car (cdr entry)))) | |
1064 | (if (> n 0) | |
1065 | (cons nil (make-list n anno)) | |
1066 | (cons (make-list (- n) anno) nil)))) | |
e5a60108 RS |
1067 | |
1068 | ;; Standard annotation | |
1069 | (let ((close (and old (cdr (assoc old prop-alist)))) | |
029894b9 BG |
1070 | (open (and new (cdr (assoc new prop-alist))))) |
1071 | (if (or close open) | |
1072 | (format-make-relatively-unique close open) | |
1073 | ;; Call "Default" function, if any | |
1074 | (let ((default (assq nil prop-alist))) | |
1075 | (if default | |
1076 | (funcall (car (cdr default)) old new)))))))) | |
1077 | ||
c84cf2bf | 1078 | (provide 'format) |
823139fb | 1079 | |
cbee283d | 1080 | ;; arch-tag: c387e9c7-a93d-47bf-89bc-8ca67e96755a |
823139fb | 1081 | ;;; format.el ends here |