--- /dev/null
+;;; drums.el --- Functions for parsing RFC822bis headers
+;; Copyright (C) 1998 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
+;; 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 and 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:
+
+(require 'date)
+
+(defvar drums-no-ws-ctl-token "\001-\010\013\014\016-\037\177"
+ "US-ASCII control characters excluding CR, LF and white space.")
+(defvar drums-text-token "\001-\011\013\014\016-\177"
+ "US-ASCII characters exlcuding CR and LF.")
+(defvar drums-specials-token "()<>[]:;@\\,.\""
+ "Special characters.")
+(defvar drums-quote-token "\\"
+ "Quote character.")
+(defvar drums-wsp-token " \t"
+ "White space.")
+(defvar drums-fws-regexp
+ (concat "[" drums-wsp-token "]*\n[" drums-wsp-token "]+")
+ "Folding white space.")
+(defvar drums-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~"
+ "Textual token.")
+(defvar drums-dot-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~."
+ "Textual token including full stop.")
+(defvar drums-qtext-token
+ (concat drums-no-ws-ctl-token "\041\043-\133\135-\177")
+ "Non-white-space control characaters, plus the rest of ASCII excluding backslash and doublequote.")
+
+(defvar 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)
+ table))
+
+(defsubst drums-init (string)
+ (set-syntax-table drums-syntax-table)
+ (insert string)
+ (drums-unfold-fws)
+ (goto-char (point-min)))
+
+(defun drums-remove-comments (string)
+ "Remove comments from STRING."
+ (with-temp-buffer
+ (let (c)
+ (drums-init string)
+ (while (not (eobp))
+ (setq c (following-char))
+ (cond
+ ((eq c ?\")
+ (forward-sexp 1))
+ ((eq c ?\()
+ (delete-region (point) (progn (forward-sexp 1) (point))))
+ (t
+ (forward-char 1))))
+ (buffer-string))))
+
+(defun drums-remove-whitespace (string)
+ "Remove comments from STRING."
+ (with-temp-buffer
+ (drums-init string)
+ (let (c)
+ (while (not (eobp))
+ (setq c (following-char))
+ (cond
+ ((eq c ?\")
+ (forward-sexp 1))
+ ((memq c '(? ?\t))
+ (delete-char 1))
+ (t
+ (forward-char 1))))
+ (buffer-string))))
+
+(defun drums-get-comment (string)
+ "Return the first comment in STRING."
+ (with-temp-buffer
+ (drums-init string)
+ (let (result c)
+ (while (not (eobp))
+ (setq c (following-char))
+ (cond
+ ((eq c ?\")
+ (forward-sexp 1))
+ ((eq c ?\()
+ (setq result
+ (buffer-substring
+ (1+ (point))
+ (progn (forward-sexp 1) (1- (point)))))
+ (goto-char (point-max)))
+ (t
+ (forward-char 1))))
+ result)))
+
+(defun drums-parse-address (string)
+ "Parse STRING and return a MAILBOX / DISPLAY-NAME pair."
+ (with-temp-buffer
+ (let (display-name mailbox c)
+ (drums-init string)
+ (while (not (eobp))
+ (setq c (following-char))
+ (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 "[" drums-atext-token "]"))
+ (push (buffer-substring (point) (progn (forward-word 1) (point)))
+ display-name))
+ ((eq c ?<)
+ (setq mailbox
+ (drums-remove-whitespace
+ (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-name (mapconcat 'identity (nreverse display-name) " "))
+ (setq display-name (drums-get-comment string)))
+ (when mailbox
+ (cons mailbox display-name)))))
+
+(defun drums-parse-addresses (string)
+ "Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs."
+ (with-temp-buffer
+ (drums-init string)
+ (let ((beg (point))
+ pairs c)
+ (while (not (eobp))
+ (setq c (following-char))
+ (cond
+ ((memq c '(?\" ?< ?\())
+ (forward-sexp 1))
+ ((eq c ?,)
+ (push (drums-parse-address (buffer-substring beg (1- (point))))
+ pairs)
+ (setq beg (point)))
+ (t
+ (forward-char 1))))
+ (nreverse pairs))))
+
+(defun drums-unfold-fws ()
+ "Unfold folding white space in the current buffer."
+ (goto-char (point-min))
+ (while (re-search-forward drums-fws-regexp nil t)
+ (replace-match " " t t))
+ (goto-char (point-min)))
+
+(defun drums-parse-date (string)
+ "Return an Emacs time spec from STRING."
+ (encode-time (parse-time-string string)))
+
+(provide 'drums)
+
+;;; drums.el ends here
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