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|
;;; rfc822.el --- hairy RFC 822 (or later) parser for mail, news, etc. -*- lexical-binding: t; -*-
;; Copyright (C) 1986-1987, 1990, 2001-2025 Free Software Foundation,
;; Inc.
;; Author: Richard Mlynarik <mly@eddie.mit.edu>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: mail
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Support functions for parsing headers used by mail and news modes.
;; The header format is specified by Internet RFC 822 and its successors.
;;; Code:
(defvar rfc822-address-start)
;; uses rfc822-address-start free, throws to address
(defun rfc822-bad-address (reason)
(save-restriction
(insert "_^_")
(narrow-to-region rfc822-address-start
(if (re-search-forward "[,;]" nil t)
(max (point-min) (1- (point)))
(point-max)))
;; make the error string be suitable for inclusion in (...)
(let ((losers '("\\" "(" ")" "\n")))
(while losers
(goto-char (point-min))
(while (search-forward (car losers) nil t)
(backward-char 1)
(insert ?\\)
(forward-char 1))
(setq losers (cdr losers))))
(goto-char (point-min)) (insert "(Unparsable address -- "
reason
": \"")
(goto-char (point-max)) (insert "\")"))
(rfc822-nuke-whitespace)
(throw 'address (buffer-substring rfc822-address-start (point))))
(defun rfc822-nuke-whitespace (&optional leave-space)
(let (ch)
(while (cond ((eobp)
nil)
((= (setq ch (following-char)) ?\()
(forward-char 1)
(while (if (eobp)
(rfc822-bad-address "Unbalanced comment (...)")
(/= (setq ch (following-char)) ?\)))
(cond ((looking-at "[^()\\]+")
(replace-match ""))
((= ch ?\()
(rfc822-nuke-whitespace))
((< (point) (1- (point-max)))
(delete-char 2))
(t
(rfc822-bad-address "orphaned backslash"))))
;; delete remaining "()"
(forward-char -1)
(delete-char 2)
t)
((memq ch '(?\ ?\t ?\n))
(delete-region (point)
(progn (skip-chars-forward " \t\n") (point)))
t)
(t
nil)))
(or (not leave-space)
(eobp)
(bobp)
(= (preceding-char) ?\ )
(insert ?\ ))))
(defun rfc822-looking-at (regex &optional leave-space)
(if (cond ((stringp regex)
(if (looking-at regex)
(progn (goto-char (match-end 0))
t)))
(t
(if (and (not (eobp))
(= (following-char) regex))
(progn (forward-char 1)
t))))
(let ((tem (match-data)))
(rfc822-nuke-whitespace leave-space)
(set-match-data tem)
t)))
(defun rfc822-snarf-word ()
;; word is atom | quoted-string
(cond ((= (following-char) ?\")
;; quoted-string
(or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"")
(rfc822-bad-address "Unterminated quoted string")))
((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+")
;; atom
)
(t
(rfc822-bad-address "Rubbish in address"))))
(defun rfc822-snarf-words ()
(rfc822-snarf-word)
(while (rfc822-looking-at ?.)
(rfc822-snarf-word)))
(defun rfc822-snarf-subdomain ()
;; sub-domain is domain-ref | domain-literal
(cond ((= (following-char) ?\[)
;; domain-ref
(or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]")
(rfc822-bad-address "Unterminated domain literal [...]")))
((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+")
;; domain-literal = atom
)
(t
(rfc822-bad-address "Rubbish in host/domain specification"))))
(defun rfc822-snarf-domain ()
(rfc822-snarf-subdomain)
(while (rfc822-looking-at ?.)
(rfc822-snarf-subdomain)))
(defun rfc822-snarf-frob-list (name separator terminator snarfer
&optional return)
(let ((first t)
(list ())
tem)
(while (cond ((eobp)
(rfc822-bad-address
(format "End of addresses in middle of %s" name)))
((rfc822-looking-at terminator)
nil)
((rfc822-looking-at separator)
;; multiple separators are allowed and do nothing.
(while (rfc822-looking-at separator))
t)
(first
t)
(t
(rfc822-bad-address
(format "Gubbish in middle of %s" name))))
(setq tem (funcall snarfer)
first nil)
(and return tem
(setq list (if (listp tem)
(nconc (reverse tem) list)
(cons tem list)))))
(nreverse list)))
;; return either an address (a string) or a list of addresses
(defun rfc822-addresses-1 (&optional allow-groups)
;; Looking for an rfc822 `address'
;; Either a group (1*word ":" [#mailbox] ";")
;; or a mailbox (addr-spec | 1*word route-addr)
;; addr-spec is (local-part "@" domain)
;; route-addr is ("<" [1#("@" domain) ":"] addr-spec ">")
;; local-part is (word *("." word))
;; word is (atom | quoted-string)
;; quoted-string is ("\([^\"\\n]\|\\.\|\\\n\)")
;; atom is [^\000-\037\177 ()<>@,;:\".[]]+
;; domain is sub-domain *("." sub-domain)
;; sub-domain is domain-ref | domain-literal
;; domain-literal is "[" *(dtext | quoted-pair) "]"
;; dtext is "[^][\\n"
;; domain-ref is atom
(let ((rfc822-address-start (point))
(n 0))
(catch 'address
;; optimize common cases:
;; foo
;; foo.bar@bar.zap
;; followed by "\\'\\|,\\|([^()\\]*)\\'"
;; other common cases are:
;; foo bar <foo.bar@baz.zap>
;; "foo bar" <foo.bar@baz.zap>
;; those aren't hacked yet.
(if (and (rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037 ()<>@,;:\\\"]+\\)" t)
(progn (or (eobp)
(rfc822-looking-at ?,))))
(progn
;; rfc822-looking-at may have inserted a space
(or (bobp) (/= (preceding-char) ?\ ) (delete-char -1))
;; relying on the fact that rfc822-looking-at <char>
;; doesn't mung match-data
(throw 'address (buffer-substring rfc822-address-start (match-end 0)))))
(goto-char rfc822-address-start)
(while t
(cond ((and (= n 1) (rfc822-looking-at ?@))
;; local-part@domain
(rfc822-snarf-domain)
(throw 'address
(buffer-substring rfc822-address-start (point))))
((rfc822-looking-at ?:)
(cond ((not allow-groups)
(rfc822-bad-address "A group name may not appear here"))
((= n 0)
(rfc822-bad-address "No name for :...; group")))
;; group
(throw 'address
;; return a list of addresses
(rfc822-snarf-frob-list ":...; group" ?\, ?\;
'rfc822-addresses-1 t)))
((rfc822-looking-at ?<)
(let ((start (point))
(strip t))
(cond ((rfc822-looking-at ?>)
;; empty path
())
((and (not (eobp)) (= (following-char) ?\@))
;; <@foo.bar,@baz:quux@abcd.efg>
(rfc822-snarf-frob-list "<...> address" ?\, ?\:
(lambda ()
(if (rfc822-looking-at ?\@)
(rfc822-snarf-domain)
(rfc822-bad-address
"Gubbish in route-addr"))))
(rfc822-snarf-words)
(or (rfc822-looking-at ?@)
(rfc822-bad-address "Malformed <..@..> address"))
(rfc822-snarf-domain)
(setq strip nil))
((progn (rfc822-snarf-words) (rfc822-looking-at ?@))
; allow <foo> (losing unix seems to do this)
(rfc822-snarf-domain)))
(let ((end (point)))
(if (rfc822-looking-at ?\>)
(throw 'address
(buffer-substring (if strip start (1- start))
(if strip end (1+ end))))
(rfc822-bad-address "Unterminated <...> address")))))
((looking-at "[^][\000-\037 ()<>@,;:\\.]")
;; this allows "." to be part of the words preceding
;; an addr-spec, since many broken mailers output
;; "Hern K. Herklemeyer III
;; <yank@megadeath.dod.gods-own-country>"
(let ((again t))
(while again
(or (= n 0) (bobp) (= (preceding-char) ?\ )
(insert ?\ ))
(rfc822-snarf-words)
(setq n (1+ n))
(setq again (or (rfc822-looking-at ?.)
(looking-at "[^][\000-\037 ()<>@,;:\\.]"))))))
((= n 0)
(throw 'address nil))
((= n 1) ; allow "foo" (losing unix seems to do this)
(throw 'address
(buffer-substring rfc822-address-start (point))))
((> n 1)
(rfc822-bad-address "Missing comma between addresses or badly-formatted address"))
((or (eobp) (= (following-char) ?,))
(rfc822-bad-address "Missing comma or route-spec"))
(t
(rfc822-bad-address "Strange character or missing comma")))))))
(defun rfc822-addresses (header-text)
(if (string-match "\\`[ \t]*\\([^][\000-\037 ()<>@,;:\\\".]+\\)[ \t]*\\'"
header-text)
;; Make very simple case moderately fast.
(list (substring header-text (match-beginning 1) (match-end 1)))
(let ((buf (generate-new-buffer " rfc822")))
(unwind-protect
(with-current-buffer buf
(setq-local case-fold-search nil) ;For speed(?)
(insert header-text)
;; unfold continuation lines
(goto-char (point-min))
(while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]"
nil t)
(replace-match "\\1 " t))
(goto-char (point-min))
;; Give `rfc822-address-start' a non-nil initial value to
;; prevent `rfc822-bad-address' from raising a
;; `wrong-type-argument' error.
(let* ((rfc822-address-start (point))
list tem
(err
(catch 'address
;; Note that `rfc822-nuke-whitespace' and
;; `rfc822-looking-at' can throw.
(rfc822-nuke-whitespace)
(while (not (eobp))
(setq rfc822-address-start (point))
(setq tem
(cond ((rfc822-looking-at ?\,)
nil)
((looking-at "[][\000-\037@;:\\.>)]")
(forward-char)
(catch 'address ; For rfc822-bad-address
(rfc822-bad-address
(format "Strange character \\%c found"
(preceding-char)))))
(t
(rfc822-addresses-1 t))))
(cond ((null tem))
((stringp tem)
(setq list (cons tem list)))
(t
(setq list (nconc (nreverse tem) list)))))
nil)))
(nreverse (append (if err (list err)) list))))
(and buf (kill-buffer buf))))))
(provide 'rfc822)
;;; rfc822.el ends here
|
