1 ;;; mime-parse.el --- MIME message parser
3 ;; Copyright (C) 1994,1995,1996,1997,1998,1999 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Keywords: parse, MIME, multimedia, mail, news
8 ;; This file is part of SEMI (Spadework for Emacs MIME Interfaces).
10 ;; This program is free software; you can redistribute it and/or
11 ;; modify it under the terms of the GNU General Public License as
12 ;; published by the Free Software Foundation; either version 2, or (at
13 ;; your option) any later version.
15 ;; This program is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; 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.
30 (autoload 'mime-entity-body-buffer "mime")
31 (autoload 'mime-entity-body-start-point "mime")
32 (autoload 'mime-entity-body-end-point "mime")
35 ;;; @ lexical analyzer
38 (defcustom mime-lexical-analyzer
39 '(std11-analyze-quoted-string
40 std11-analyze-domain-literal
45 "*List of functions to return result of lexical analyze.
46 Each function must have two arguments: STRING and START.
47 STRING is the target string to be analyzed.
48 START is start position of STRING to analyze.
50 Previous function is preferred to next function. If a function
51 returns nil, next function is used. Otherwise the return value will
54 :type '(repeat function))
56 (defun mime-analyze-tspecial (string start)
57 (if (and (> (length string) start)
58 (memq (aref string start) mime-tspecial-char-list))
59 (cons (cons 'tpecials (substring string start (1+ start)))
63 (defun mime-analyze-token (string start)
64 (if (and (string-match mime-token-regexp string start)
65 (= (match-beginning 0) start))
66 (let ((end (match-end 0)))
67 (cons (cons 'mime-token (substring string start end))
68 ;;(substring string end)
76 (defconst mime/content-parameter-value-regexp
78 std11-quoted-string-regexp
81 (defconst mime::parameter-regexp
82 (concat "^[ \t]*\;[ \t]*\\(" mime-token-regexp "\\)"
83 "[ \t]*=[ \t]*\\(" mime/content-parameter-value-regexp "\\)"))
85 (defun mime-parse-parameter (str)
86 (if (string-match mime::parameter-regexp str)
87 (let ((e (match-end 2)))
89 (cons (downcase (substring str (match-beginning 1) (match-end 1)))
90 (std11-strip-quoted-string
91 (substring str (match-beginning 2) e))
101 (defun mime-parse-Content-Type (string)
102 "Parse STRING as field-body of Content-Type field.
104 (PRIMARY-TYPE SUBTYPE (NAME1 . VALUE1)(NAME2 . VALUE2) ...)
105 or nil. PRIMARY-TYPE and SUBTYPE are symbol and NAME_n and VALUE_n
107 (setq string (std11-unfold-string string))
108 (if (string-match (eval-when-compile
109 (concat "^\\(" mime-token-regexp
110 "\\)/\\(" mime-token-regexp "\\)")) string)
111 (let* ((type (downcase
112 (substring string (match-beginning 1) (match-end 1))))
114 (substring string (match-beginning 2) (match-end 2))))
116 (setq string (substring string (match-end 0)))
117 (while (setq ret (mime-parse-parameter string))
118 (setq dest (cons (car ret) dest)
121 (make-mime-content-type (intern type)(intern subtype)
126 (defun mime-read-Content-Type ()
127 "Read field-body of Content-Type field from current-buffer,
128 and return parsed it. Format of return value is as same as
129 `mime-parse-Content-Type'."
130 (let ((str (std11-field-body "Content-Type")))
132 (mime-parse-Content-Type str)
136 ;;; @ Content-Disposition
140 (defconst mime-disposition-type-regexp mime-token-regexp)
144 (defun mime-parse-Content-Disposition (string)
145 "Parse STRING as field-body of Content-Disposition field."
146 (setq string (std11-unfold-string string))
147 (if (string-match (eval-when-compile
148 (concat "^" mime-disposition-type-regexp)) string)
149 (let* ((e (match-end 0))
150 (type (downcase (substring string 0 e)))
152 (setq string (substring string e))
153 (while (setq ret (mime-parse-parameter string))
154 (setq dest (cons (car ret) dest)
157 (cons (cons 'type (intern type))
162 (defun mime-read-Content-Disposition ()
163 "Read field-body of Content-Disposition field from current-buffer,
164 and return parsed it."
165 (let ((str (std11-field-body "Content-Disposition")))
167 (mime-parse-Content-Disposition str)
171 ;;; @ Content-Transfer-Encoding
175 (defun mime-parse-Content-Transfer-Encoding (string)
176 "Parse STRING as field-body of Content-Transfer-Encoding field."
177 (let ((tokens (std11-lexical-analyze string mime-lexical-analyzer))
180 (setq token (car tokens))
181 (std11-ignored-token-p token))
182 (setq tokens (cdr tokens)))
184 (if (eq (car token) 'mime-token)
185 (downcase (cdr token))
189 (defun mime-read-Content-Transfer-Encoding (&optional default-encoding)
190 "Read field-body of Content-Transfer-Encoding field from
191 current-buffer, and return it.
192 If is is not found, return DEFAULT-ENCODING."
193 (let ((str (std11-field-body "Content-Transfer-Encoding")))
195 (mime-parse-Content-Transfer-Encoding str)
199 ;;; @ Content-Id / Message-Id
203 (defun mime-parse-msg-id (tokens)
204 "Parse TOKENS as msg-id of Content-Id or Message-Id field."
205 (car (std11-parse-msg-id tokens)))
208 (defun mime-uri-parse-cid (string)
209 "Parse STRING as cid URI."
211 (mime-parse-msg-id (cons '(specials . "<")
213 (cdr (cdr (std11-lexical-analyze string)))
214 '((specials . ">")))))))
220 (defun mime-parse-multipart (entity)
221 (with-current-buffer (mime-entity-body-buffer entity)
222 (let* ((representation-type
223 (mime-entity-representation-type-internal entity))
224 (content-type (mime-entity-content-type-internal entity))
227 (mime-content-type-parameter content-type "boundary")))
228 (delimiter (concat "\n" (regexp-quote dash-boundary)))
229 (close-delimiter (concat delimiter "--[ \t]*$"))
230 (rsep (concat delimiter "[ \t]*\n"))
232 (if (eq (mime-content-type-subtype content-type) 'digest)
233 (make-mime-content-type 'message 'rfc822)
234 (make-mime-content-type 'text 'plain)
236 (body-start (mime-entity-body-start-point entity))
237 (body-end (mime-entity-body-end-point entity)))
240 (narrow-to-region body-start
241 (if (re-search-backward close-delimiter nil t)
244 (goto-char body-start)
245 (if (re-search-forward
246 (concat "^" (regexp-quote dash-boundary) "[ \t]*\n")
248 (let ((cb (match-end 0))
250 (node-id (mime-entity-node-id-internal entity))
252 (while (re-search-forward rsep nil t)
253 (setq ce (match-beginning 0))
254 (setq ncb (match-end 0))
256 (narrow-to-region cb ce)
257 (setq ret (mime-parse-message representation-type dc-ctl
258 entity (cons i node-id)))
260 (setq children (cons ret children))
261 (goto-char (setq cb ncb))
264 (setq ce (point-max))
266 (narrow-to-region cb ce)
267 (setq ret (mime-parse-message representation-type dc-ctl
268 entity (cons i node-id)))
270 (setq children (cons ret children))
271 (mime-entity-set-children-internal entity (nreverse children))
273 (mime-entity-set-content-type-internal
274 entity (make-mime-content-type 'message 'x-broken))
278 (defun mime-parse-encapsulated (entity)
279 (mime-entity-set-children-internal
281 (with-current-buffer (mime-entity-body-buffer entity)
283 (narrow-to-region (mime-entity-body-start-point entity)
284 (mime-entity-body-end-point entity))
285 (list (mime-parse-message
286 (mime-entity-representation-type-internal entity) nil
287 entity (cons 0 (mime-entity-node-id-internal entity))))
290 (defun mime-parse-message (representation-type &optional default-ctl
292 (let ((header-start (point-min))
295 (body-end (point-max))
297 (goto-char header-start)
298 (if (re-search-forward "^$" nil t)
299 (setq header-end (match-end 0)
300 body-start (if (= header-end body-end)
303 (setq header-end (point-min)
304 body-start (point-min)))
306 (narrow-to-region header-start header-end)
307 (setq content-type (or (let ((str (std11-fetch-field "Content-Type")))
309 (mime-parse-Content-Type str)
313 (luna-make-entity representation-type
314 :location (current-buffer)
315 :content-type content-type
318 :buffer (current-buffer)
319 :header-start header-start
320 :header-end header-end
321 :body-start body-start
330 (defun mime-parse-buffer (&optional buffer representation-type)
331 "Parse BUFFER as a MIME message.
332 If buffer is omitted, it parses current-buffer."
334 (if buffer (set-buffer buffer))
335 (setq mime-message-structure
336 (mime-parse-message (or representation-type
337 'mime-buffer-entity) nil))
344 (provide 'mime-parse)
346 ;;; mime-parse.el ends here