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-;;; ietf-drums.el --- Functions for parsing RFC822bis headers
-
-;; Copyright (C) 1998-2016 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
-
-;;; 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.
-
-;; Pending a real regression self test suite, Simon Josefsson added
-;; various self test expressions snipped from bug reports, and their
-;; expected value, below. I you believe it could be useful, please
-;; add your own test cases, or write a real self test suite, or just
-;; remove this.
-
-;; <m3oekvfd50.fsf@whitebox.m5r.de>
-;; (ietf-drums-parse-address "'foo' <foo@example.com>")
-;; => ("foo@example.com" . "'foo'")
-
-;;; Code:
-
-(eval-when-compile (require 'cl))
-(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 (make-char 'ascii b) out)
- (incf b))
- (setq range nil))
- ((= i (length token))
- (push (make-char 'ascii c) out))
- (t
- (when b
- (push (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 ?\")
- (condition-case err
- (forward-sexp 1)
- (error (goto-char (point-max)))))
- ((eq c ?\()
- (delete-region
- (point)
- (condition-case nil
- (with-syntax-table (copy-syntax-table ietf-drums-syntax-table)
- (modify-syntax-entry ?\" "w")
- (forward-sexp 1)
- (point))
- (error (point-max)))))
- (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
- (forward-char 1))))
- ;; 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 (and display-string
- (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 &optional rawp)
- "Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs.
-If RAWP, don't actually parse the addresses, but instead return
-a list of address strings."
- (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
- (if rawp
- (buffer-substring beg (point))
- (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
- (if rawp
- (buffer-substring beg (point))
- (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))
-
-(defun ietf-drums-make-address (name address)
- (if name
- (concat (ietf-drums-quote-string name) " <" address ">")
- address))
-
-(provide 'ietf-drums)
-
-;;; ietf-drums.el ends here
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