[Emacs-diffs] Changes to emacs/lisp/gnus/ietf-drums.el [gnus-5_10-branch]

[Andreas Schwab]

Index: emacs/lisp/gnus/ietf-drums.el
diff -c /dev/null emacs/lisp/gnus/ietf-drums.el:1.9.2.1
*** /dev/null   Thu Jul 22 16:46:50 2004
--- emacs/lisp/gnus/ietf-drums.el       Thu Jul 22 16:45:49 2004
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*** 0 ****
--- 1,269 ----
+ ;;; ietf-drums.el --- Functions for parsing RFC822bis headers
+ ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
+ ;;        Free Software Foundation, Inc.
+ 
+ ;; Author: Lars Magne Ingebrigtsen <address@hidden>
+ ;; This file is part of GNU Emacs.
+ 
+ ;; GNU Emacs is free software; you can redistribute it and/or modify
+ ;; it under the terms of the GNU General Public License as published by
+ ;; the Free Software Foundation; either version 2, or (at your option)
+ ;; any later version.
+ 
+ ;; GNU Emacs is distributed in the hope that it will be useful,
+ ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+ ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.        See the
+ ;; GNU General Public License for more details.
+ 
+ ;; You should have received a copy of the GNU General Public License
+ ;; along with GNU Emacs; see the file COPYING.  If not, write to the
+ ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+ 
+ ;;; Commentary:
+ 
+ ;; DRUMS is an IETF Working Group that works (or worked) on the
+ ;; successor to RFC822, "Standard For The Format Of Arpa Internet Text
+ ;; Messages".  This library is based on
+ ;; draft-ietf-drums-msg-fmt-05.txt, released on 1998-08-05.
+ 
+ ;;; Code:
+ 
+ (eval-when-compile (require 'cl))
+ (require 'time-date)
+ (require 'mm-util)
+ 
+ (defvar ietf-drums-no-ws-ctl-token "\001-\010\013\014\016-\037\177"
+   "US-ASCII control characters excluding CR, LF and white space.")
+ (defvar ietf-drums-text-token "\001-\011\013\014\016-\177"
+   "US-ASCII characters excluding CR and LF.")
+ (defvar ietf-drums-specials-token "()<>[]:;@\\,.\""
+   "Special characters.")
+ (defvar ietf-drums-quote-token "\\"
+   "Quote character.")
+ (defvar ietf-drums-wsp-token " \t"
+   "White space.")
+ (defvar ietf-drums-fws-regexp
+   (concat "[" ietf-drums-wsp-token "]*\n[" ietf-drums-wsp-token "]+")
+   "Folding white space.")
+ (defvar ietf-drums-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~"
+   "Textual token.")
+ (defvar ietf-drums-dot-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~."
+   "Textual token including full stop.")
+ (defvar ietf-drums-qtext-token
+   (concat ietf-drums-no-ws-ctl-token "\041\043-\133\135-\177")
+   "Non-white-space control characters, plus the rest of ASCII excluding
+ backslash and doublequote.")
+ (defvar ietf-drums-tspecials "][()<>@,;:\\\"/?="
+   "Tspecials.")
+ 
+ (defvar ietf-drums-syntax-table
+   (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
+     (modify-syntax-entry ?\\ "/" table)
+     (modify-syntax-entry ?< "(" table)
+     (modify-syntax-entry ?> ")" table)
+     (modify-syntax-entry ?@ "w" table)
+     (modify-syntax-entry ?/ "w" table)
+     (modify-syntax-entry ?* " " table)
+     (modify-syntax-entry ?\; " " table)
+     (modify-syntax-entry ?\' " " table)
+     (if (featurep 'xemacs)
+       (let ((i 128))
+         (while (< i 256)
+           (modify-syntax-entry i "w" table)
+           (setq i (1+ i)))))
+     table))
+ 
+ (defun ietf-drums-token-to-list (token)
+   "Translate TOKEN into a list of characters."
+   (let ((i 0)
+       b e c out range)
+     (while (< i (length token))
+       (setq c (mm-char-int (aref token i)))
+       (incf i)
+       (cond
+        ((eq c (mm-char-int ?-))
+       (if b
+           (setq range t)
+         (push c out)))
+        (range
+       (while (<= b c)
+         (push (mm-make-char 'ascii b) out)
+         (incf b))
+       (setq range nil))
+        ((= i (length token))
+       (push (mm-make-char 'ascii c) out))
+        (t
+       (when b
+         (push (mm-make-char 'ascii b) out))
+       (setq b c))))
+     (nreverse out)))
+ 
+ (defsubst ietf-drums-init (string)
+   (set-syntax-table ietf-drums-syntax-table)
+   (insert string)
+   (ietf-drums-unfold-fws)
+   (goto-char (point-min)))
+ 
+ (defun ietf-drums-remove-comments (string)
+   "Remove comments from STRING."
+   (with-temp-buffer
+     (let (c)
+       (ietf-drums-init string)
+       (while (not (eobp))
+       (setq c (char-after))
+       (cond
+        ((eq c ?\")
+         (forward-sexp 1))
+        ((eq c ?\()
+         (delete-region (point) (progn (forward-sexp 1) (point))))
+        (t
+         (forward-char 1))))
+       (buffer-string))))
+ 
+ (defun ietf-drums-remove-whitespace (string)
+   "Remove whitespace from STRING."
+   (with-temp-buffer
+     (ietf-drums-init string)
+     (let (c)
+       (while (not (eobp))
+       (setq c (char-after))
+       (cond
+        ((eq c ?\")
+         (forward-sexp 1))
+        ((eq c ?\()
+         (forward-sexp 1))
+        ((memq c '(? ?\t ?\n))
+         (delete-char 1))
+        (t
+         (forward-char 1))))
+       (buffer-string))))
+ 
+ (defun ietf-drums-get-comment (string)
+   "Return the first comment in STRING."
+   (with-temp-buffer
+     (ietf-drums-init string)
+     (let (result c)
+       (while (not (eobp))
+       (setq c (char-after))
+       (cond
+        ((eq c ?\")
+         (forward-sexp 1))
+        ((eq c ?\()
+         (setq result
+               (buffer-substring
+                (1+ (point))
+                (progn (forward-sexp 1) (1- (point))))))
+        (t
+         (forward-char 1))))
+       result)))
+ 
+ (defun ietf-drums-strip (string)
+   "Remove comments and whitespace from STRING."
+   (ietf-drums-remove-whitespace (ietf-drums-remove-comments string)))
+ 
+ (defun ietf-drums-parse-address (string)
+   "Parse STRING and return a MAILBOX / DISPLAY-NAME pair."
+   (with-temp-buffer
+     (let (display-name mailbox c display-string)
+       (ietf-drums-init string)
+       (while (not (eobp))
+       (setq c (char-after))
+       (cond
+        ((or (eq c ? )
+             (eq c ?\t))
+         (forward-char 1))
+        ((eq c ?\()
+         (forward-sexp 1))
+        ((eq c ?\")
+         (push (buffer-substring
+                (1+ (point)) (progn (forward-sexp 1) (1- (point))))
+               display-name))
+        ((looking-at (concat "[" ietf-drums-atext-token "@" "]"))
+         (push (buffer-substring (point) (progn (forward-sexp 1) (point)))
+               display-name))
+        ((eq c ?<)
+         (setq mailbox
+               (ietf-drums-remove-whitespace
+                (ietf-drums-remove-comments
+                 (buffer-substring
+                  (1+ (point))
+                  (progn (forward-sexp 1) (1- (point))))))))
+        (t (error "Unknown symbol: %c" c))))
+       ;; If we found no display-name, then we look for comments.
+       (if display-name
+         (setq display-string
+               (mapconcat 'identity (reverse display-name) " "))
+       (setq display-string (ietf-drums-get-comment string)))
+       (if (not mailbox)
+         (when (string-match "@" display-string)
+           (cons
+            (mapconcat 'identity (nreverse display-name) "")
+            (ietf-drums-get-comment string)))
+       (cons mailbox display-string)))))
+ 
+ (defun ietf-drums-parse-addresses (string)
+   "Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs."
+   (if (null string)
+       nil
+     (with-temp-buffer
+       (ietf-drums-init string)
+       (let ((beg (point))
+           pairs c address)
+       (while (not (eobp))
+         (setq c (char-after))
+         (cond
+          ((memq c '(?\" ?< ?\())
+           (condition-case nil
+               (forward-sexp 1)
+             (error
+              (skip-chars-forward "^,"))))
+          ((eq c ?,)
+           (setq address
+                 (condition-case nil
+                     (ietf-drums-parse-address
+                      (buffer-substring beg (point)))
+                   (error nil)))
+           (if address (push address pairs))
+           (forward-char 1)
+           (setq beg (point)))
+          (t
+           (forward-char 1))))
+       (setq address
+             (condition-case nil
+                 (ietf-drums-parse-address
+                  (buffer-substring beg (point)))
+               (error nil)))
+       (if address (push address pairs))
+       (nreverse pairs)))))
+ 
+ (defun ietf-drums-unfold-fws ()
+   "Unfold folding white space in the current buffer."
+   (goto-char (point-min))
+   (while (re-search-forward ietf-drums-fws-regexp nil t)
+     (replace-match " " t t))
+   (goto-char (point-min)))
+ 
+ (defun ietf-drums-parse-date (string)
+   "Return an Emacs time spec from STRING."
+   (apply 'encode-time (parse-time-string string)))
+ 
+ (defun ietf-drums-narrow-to-header ()
+   "Narrow to the header section in the current buffer."
+   (narrow-to-region
+    (goto-char (point-min))
+    (if (re-search-forward "^\r?$" nil 1)
+        (match-beginning 0)
+      (point-max)))
+   (goto-char (point-min)))
+ 
+ (defun ietf-drums-quote-string (string)
+   "Quote string if it needs quoting to be displayed in a header."
+   (if (string-match (concat "[^" ietf-drums-atext-token "]") string)
+       (concat "\"" string "\"")
+     string))
+ 
+ (provide 'ietf-drums)
+ 
+ ;;; arch-tag: 379a0191-dbae-4ca6-a0f5-d4202c209ef9
+ ;;; ietf-drums.el ends here